The modular structure and versatility of antibodies enables one to modify natural immunoglobulins in different ways for various clinical applications. Rational design and molecular engineering make it possible to directionally modify the molecular size, affinity, specificity, and immunogenicity and effector functions of an antibody, as well as to combine them with other functional agents. This review focuses on up-to-date methods of antibody engineering for diagnosing and treating various diseases, particularly on new technologies meant to refine the effector functions of therapeutic antibodies.
ADcc (antibody-dependent cellular cytotoxicity); cDc (complement-dependent cytotoxicity); MAb (monoclonal antibodies); cH and cL (constant domains of antibody heavy and light chains); СНО cells (chinese hamster ovary cells); eGFr (Her1) (epidermal growth factor receptor, cancer marker); Fab (antigen-binding fragment of antibody); Fc (constant (crystallizable) antibody fragment); Fc?r (cell receptor of antibody Fc-fragments); Fcrn (neonatal receptor of antibody Fc-fragments); Her1 and Her2/neu (cancer markers of tyrosine kinase receptor group); IgA, IgG, IgD, Ige, IgM (A, G, D, e, M immunoglobulins (antibodies of the A, G, D, e, M classes)); scFv (single chain fragment variable); PSMA (prostate-specific membrane antigen); VeGF (vascular endothelial growth factor); VH and VL (variable domains of heavy and light antibody chains).
D. A. Skvortzov, M. P. Rubzova, M. E. Zvereva,
F. L. Kiselev, O. A. Donzova
The Regulation of Telomerase in Oncogenesis
D. A. Skvortzov1, M. P. Rubzova1, M. E. Zvereva1, F. L. Kiselev2, O. A. Donzova1* 1Department of Chemistry, Moscow State University, 119992 Moscow 2Blokhin Oncological Science Centre, Russian Academy of Medical Science, 115478 Moscow
Telomerase is a complex ribonucleoprotein that completes the telomeres' ends in eukaryotic cells which shorten due to DnA underreplication. The core enzyme consists of a protein catalytic subunit—telomerase reverse transcriptase (tert)—and telomeric rnA (telomerase rnA (tr)); a small region of this rnA serves as a template for the telomeric repeats synthesis. Apart from rare exceptions, telomerase is not active in the somatic cells and tissues of the human body. However, the activation of telomerase activity in cancer cells was shown for certain in 80–90 % of cases. Understanding the mechanism of telomerase functioning and the mechanisms of its regulation could be used in oncodiagnostics. Telomerase itself and its regulators could be important targets for anticancer therapy. The activity of telomerase in a cell is affected by proteins with multiple functions, and this influence is not necessarily specific. There are also cases when telomerase regulators act together or when several regulators are organised in the cascade. The aim of this review is to generalize and systemize data about the regulation of telomerase in ontogenesis.
Catalytic Bioscavengers Against Toxic Esters, an Alternative Approach for Prophylaxis and Treatments of Poisonings
Patrick Masson1,2*, Daniel Rochu1,3 1Centre de Recherches du Service de Sante des Armees, Toxicology department, La Tronche, France 2Institute of Structure Biology, Molecular Biophysics Laboratory, Grenoble, France 3Bundeswehr Institute of Toxicology and Pharmacology, Munich, Germany
Bioscavengers are biopharmaceuticals that specifically react with toxicants. Thus, enzymes reacting with poisonous esters can be used as bioscavengers for neutralization of toxic molecules before they reach physiological targets. Parenteral administration of bioscavengers is, therefore, intended for prophylaxis or pre-treatments, emergency and post-exposure treatments of intoxications. These enzymes can also be used for application on skin, mucosa and wounds as active components of topical skin protectants and decontamination solutions. Human butyrylcholinesterase is the first stoichiometric bioscavenger for safe and efficient prophylaxis of organophosphate poisoning. However, huge amounts of a costly enzyme are needed for protection. Thus, the bioscavenger approach will be greatly improved by the use of catalytic bioscavengers. Catalytic bioscavengers are enzymes capable of degrading toxic esters with a turnover. Suitable catalytic bioscavengers are engineered mutants of human enzymes. Efficient mutants of human butyrylcholinesterase have been made that hydrolyze cocaine at a high rate. Mutants of human cholinesterases capable of hydrolyzing OPs have been made, but so far their activity is too low to be of medical interest. Human paraoxonase a promiscuous plasma enzyme is certainly the most promising phosphotriesterase. However, its biotechnology is still in its infancy.
Other enzymes and proteins from blood and organs, and secondary biological targets of OPs and carbamates are potential bioscavengers, in particular serum albumin that reacts with OPs and self-reactivates. Lastly, non-human enzymes, phosphotriesterases and oxidases from various bacterial and eukaryotic sources could be used for external use against OP poisoning and for internal use after modifications for immunological compatibility.
Decisions in the CD95 System: Main Pro- and Anti- Apoptotic Modulators
Inna N. Lavrik*, Peter H. Krammer
Division of Immunogenetics, Tumorimmunology Program German Cancer Research Center, Im Neuenheimer Feld 280, D-69120 Heidelberg, Germany
Apoptosis is common to all multicellular organisms. Apoptosis can be triggered by the extrinsic (death receptor (DR)) or the intrinsic (mitochondrial) death pathways. CD95 (APO-1/Fas) is a prototypic member of the DR family. This review is focused on the mechanisms of CD95 (APO-1/Fas)-mediated apoptosis and the role in the apoptosis of the death effector domain (DED)-containing proteins: pro-apoptotic protein procaspase-8 and anti-apoptotic protein c-FLIP. Gaining insights into these processes will improve our understanding of the pathogenesis of diseases such as cancer, autoimmunity and AIDS, and will open new approaches to rational treatment strategies.
A. V. Bacheva, A. A. Belogurov, N. A. Ponomarenko, V. D. Knorre, V. M. Govorun, M. V. Serebryakova, A. G. Gabibov
Analysis of Myelin Basic Protein Fragmentation by Proteasome
A. V. Bacheva1, A. A. Belogurov2, N. A. Ponomarenko2, V. D. Knorre2, V. M. Govorun2, M. V. Serebryakova3, and A. G. Gabibov1,2 1Chemistry Department, Moscow State University 2Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences 3Proteomic Center, Russian Academy of Medical Sciences, Institute of Physical–Chemical Medicine
The proteasome is a high molecular protein complex whose purpose is specific protein degradation in eukaryotic cells. One of the proteasome functions is to produce peptides, which will then be presented on the outer cell membrane using main histocompatibility complex (MHc) molecules of the first or second class. There are definite reasons to believe that proteasome directly takes part in the specific degradation of myelin basic protein (MBP), which make up to 30% of all proteins in the myelin sheath of neuronal axons. The details of the proteasomal degradation of MBP are still unclear. In this work, the features of specific MBP degradation by proteasome were studied. It was demonstrated that MBP (non-ubiquitinated) is a good substrate for 20S and for the 26S proteasome. This is the first work on detecting the sites of MBP proteolysis by proteasome from brains of SJL/J/J and Balb/c mice’s lines. Substantial differences in the degradation pattern of this neuroantigen were found, which could indicate the better presentation MBP parts on MHc molecules in the case of mice predisposed to the development of experimental autoimmune encephalomyelitis.
Complete Sequencing of the Mitochondrial Genome of Opisthorchis felineus, Causative Agent of Opisthorchiasis
V.A. Mordvinov1, А.V. Mardanov2, N.V. Ravin2, S.V. Shekhovtsov1, S.А. Demakov1, А.V. Katokhin1, N.А. Kolchanov1, and K.G. Skryabin2*
1Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, 10 Lavrentieva Ave, Novosibirsk, 630090, Russia
2Bioengineering Center, Russian Academy of Sciences, 7/1 60?letiya Oktyabrya Ave, Moscow, 117312, Russia
* E-mail: email@example.com
Opisthorchis felineus, a hepatic trematode, is the causative agent of opisthorchiasis, a dangerous disease in both human beings and animals. Opisthorchiasis is widespread in Russia, especially Western Siberia. The purpose of the present study was to determine the complete mitochondrial DnA sequence of this flatworm. two parallel methods were employed: (1) capillary electrophoresis to sequence the mitochondrial genome fragments obtained through specific PCR amplification, and (2) high throughput sequencing of the DnA sample. Both methods made possible the determination of the complete nucleotide sequence of the O. felineus mitochondrial genome. the genome consists of a ring molecule 14,277 nt in length that contains 35 genes coding 2 rrnA, 22 trnA, and 12 proteins: 3 subunits of cytochrome-c-oxidase, 7 subunits of nADH-dehydrogenase, B apocytochrome, and subunit 6 of AtP-synthetase. Like many other flatworms, O. felineus is characterized by the absence of the AtP-synthetase subunit 8 gene. Nineteen out of the 22 trnAs have a typical “clover leaf” structure. The trnA(AGc) and trnA-cys genes lack DHu-loops, while the trnA-Ser(ucA) has 2 alternative structures: one with a DHu-loop, and one without it. Analyzing the results obtained from the high throughput sequencing revealed 45 single-nucleotide polymorphisms within the mitochondrial genome. The results obtained in this study may be used in the development of molecular diagnostic methods for opisthorchiasis. This study shows that high throughput sequencing is a fast and effective method for decoding the mitochondrial genome of animals.
The Organization in Micro-Loops of an Extended Fragment of Chicken Chromosome 14, Including the Alpha Globin Gene Cluster in the Erythroid Cells
E.S. Philonenko*, A.A. Gavrilov, S.V. Ravin, O.V. Iarovaia
Institute of Gene Biology, Russian Academy of Sciences, 34/5 Vavilov Street, 119344 Moscow, Russia
It has been shown that the activation of tissue-specific gene transcription during the course of cell differentiation is associated with a spatial reorganization of the genomic domains harboring those specific genes. This reorganization consists of the relocation to the nuclear matrix of the whole genomic domain containing one or more of the genes being transcribed. However, it remains unclear whether, during this process, extended areas of the genome also become attached to the nuclear matrix. We studied the genome's pattern of interaction with the nuclear matrix in both erythroid and non-erythroid cells of chickens, using a 220Kb region of chromosome #14, which contains the alpha-globin gene cluster and some surrounding house-keeping genes. the results show that in erythroid cells, the fragment of the genome containing the alpha-globin gene domain became spatially arranged into micro-loops which could not be detected by mapping experiments.
Direct Matrix-Assisted Laser Desorption–Ionisation (MALDI) Mass-Spectrometry Bacteria Profiling for Identifying and Characterizing Pathogens
E. N. Ilina
Scientific Research Institute of Physical-Chemical Medicine
This study examines the features and limitations of direct Matrix-Assisted Laser Desorption–Ionisation (MALDI) mass-spectrometry profiling of bacterial cells for investigating a microbial population. The optimal laboratory protocol, including crude bacteria lyses by a solution of 50% acetonitrile, 2.5% trifluoroacetic acid, and using α-cyano-4-hydroxy cinnamic acid as the MALDI matrix, has been developed. Two different bacteria species were under investigation, and representative mass spectra from 278 strains of Neisseria gonorrhoeae and 22 strains of Helicobacter pylori have been analyzed. It’s known that both bacteria demonstrate a variable degree of polymorphism. For N. gonorrhoeae, the MALDI mass spectra that was collected possessed about 70 peaks, 20 of which were good reproducible ones. In spite of the fact that three peaks were found with differing spectra in some strains, little diversity in the N. gonorrhoeae population was revealed. This fact indicates the prospects in using direct MALDI mass-spectrometry profiling for gonococcus identification. In the case of H. pylori strains, the variety in the collected mass-spectra was shown to be essential. Only five peaks were present in more than 70% of strains, and a single mass value was common for all spectra. While these data call into question the possibility of the reliable species identification of H. pylori using this approach, the intraspecies differentiation of strains was offered. Good association between MALDI profile distributions and the region of strain isolation have been found. Thus, the suggested direct MALDI mass-spectrometry profiling strategy, coupled with special analysis software, seems promising for the species identification of N. gonorrhoeae but is assumed insufficient for H. pylori species determination. At the same time, this would create a very good chance for an epidemiological study of such variable bacteria as H. pylori.
MALDI mass spectrometry, bacteria profiling, Neisseria gonorrhoeae, Helicobacter pylori.
K. А. Konduktorov, G. S. Lyudva, А. V. Ivanov, V. L. Tunitskaya, and S. N. Kochetkov
The Interaction between the RNA - Dependent RNA - Polymerase of the Hepatitis Virus and RNA Matrices
K. А. Konduktorov, G. S. Lyudva, А. V. Ivanov, V. L. Tunitskaya, and S. N. Kochetkov*
Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilova 32, Moscow 119991, Russia
O. Nekrasova, A. Tagway, A. Ignatova,
A. Feofanov, M. Kirpichnikov
Studying of Membrane Localization of Recombinant Potassium Channels in E.coli
O. Nekrasova1*, A. Tagway1, A. Ignatova1,2, A. Feofanov1,2, M. Kirpichnikov1,2 1Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Miklukho-Maklaya 16/10, 117997, Moscow, Russia 2Biological Faculty, Lomonosov Moscow State University, Vorobyevi Gori 1, Moscow, 119992, Russia
The effective expression of recombinant membrane proteins in E.coli depends upon the targeting and insertion of proteins into the cellular membrane, as well as on those proteins adopting the correct spatial structure. A significant technological problem involves the design of approaches for detecting the location of target proteins within a host cell. Using a hybrid potassium channel KcsA-Kv1.3 as a model, we developed a technological scheme which is suitable for the study of membrane localization in E.coli cells of recombinant proteins containing voltage-gated eukaryotic potassium channels as the functional active site. The scheme involves both biochemical and fluorescent methods for detecting target proteins in the cytoplasmic membrane of E.coli, as well as the study of the ligand-binding activity of membrane-embedded proteins.
E. L. Arsenieva, I. V. Kuzmin, E. S. Manuilova,
E. V. Novosadova, E. V. Murkin, G. V. Pavlova,
V. Z. Tarantul, and I. A. Grivennikov
The Production and Characteristics of a Mouse’s Embryonic Stem Cell Lineage, Transfected by the Glia Neurotrophic Factor and Gene Fused with the Green Fluorescent Protein Gene
E. L. Arsenieva, I. V. Kuzmin, E. S. Manuilova, E. V. Novosadova, E. V. Murkin, G. V. Pavlova, V. Z. Tarantul, and I. A. Grivennikov
Molecular Genetics Institute, Russian Academy of Sciences, Moscow
Gene Biology Institute, Russian Academy of Sciences, Moscow
The influence that the expression of the human (glial-derived neurotrophic factor (GDnF)) neurotrophic factor has on the morphology and proliferative activity of embryonic stem cells (Sc) of a mouse with r1 lineage, as well as their ability to form embroid bodies (eB), has been studied. Before that, using a Pcr (polymerase chain reaction) coupled with reverse transcription, it was shown that, in this very lineage of the embryonic Sc, the expression of the receptors’ genes is being fulfilled for the neurotropfic ret and GFrα1 glia factor. The mouse's embryonic Sc lineage has been obtained, transfected by the human GDnF gene, and has been fused with the “green” fluorescent protein (GFP) gene. the presence of the expression of the human GDnF gene in the cells was shown by northern hybridization and the synthesis of its albuminous product by immunocitochemical coloration with the use of specific antibodies. The reliable slowing-down of the embriod-body formation by the embryonic Sc transfected by the GDnF gene has been shown. no significant influence of the expression of the GDnF gene on the morphology and the proliferative activity of the transfected embryonic Scs has been found when compared with the control ones.
T. V. Pyrkov, D. V. Pyrkova, E. D. Balitskaya, and R. G. Efremov
The Role of Stacking Interactions in Complexes of Proteins with Adenine and Guanine Fragments of Ligands
T. V. Pyrkov1,2*, D. V. Pyrkova1, E. D. Balitskaya1,3, and R. G. Efremov1 1Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, ul. Miklukho-Maklaya 16/10, Moscow, 117997, Russia. 2Moscow Institute of Physics and Technology (State University), Institutskii per., 9, Dolgoprudny, Moscow oblast, 141700, Russia. 3Moscow State University, Moscow, 119991, Russia
Computer Modeling of the Structure and Spectra of Fluorescent Proteins
A.V. Nemukhin1,2*, B.L. Grigorenko1, A.P. Savitsky1,3 1Department of Chemistry, M.V. Lomonosov Moscow State University 2N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences 3A.N. Bach Institute of Biochemisty, Russian Academy of Sciences
Fluorescent proteins from the family of green fluorescent proteins are intensively used as biomarkers in living systems. The chromophore group based on the hydroxybenzylidene-imidazoline molecule, which is formed in nature from three amino-acid residues inside the protein globule and well shielded from external media, is responsible for light absorption and fluorescence. Along with the intense experimental studies of the properties of fluorescent proteins and their chromophores by biochemical, X-ray, and spectroscopic tools, in recent years, computer modeling has been used to characterize their properties and spectra. We present in this review the most interesting results of the molecular modeling of the structural parameters and optical and vibrational spectra of the chromophorecontaining domains of fluorescent proteins by methods of quantum chemistry, molecular dynamics, and combined quantum-mechanical–molecular-mechanical approaches. The main emphasis is on the correlation of theoretical and experimental data and on the predictive power of modeling, which may be useful for creating new, efficient biomarkers.
green fluorescent protein, molecular modeling, molecular dynamics, molecular mechanics
QM/MM - combined methods of quantum and molecular mechanics, MD - molecular dynamics, tD-DFt - the method of density functional theory depending on time.
O.A. Patutina, N.L. Mironova, V.V. Vlassov, M.A. Zenkova
New Approaches for Cancer Treatment: Antitumor Drugs Based on Gene-Targeted Nucleic Acids
O.A. Patutina, N.L. Mironova, V.V. Vlassov, M.A. Zenkova*
Institute of Chemical Biology and Fundamental Medicine, Siberian Branch, Russian Academy of Sciences
Currently, the main way to fight cancer is still chemotherapy. This method of treatment is at the height of its capacity, so, setting aside the need for further improvements in traditional treatments for neoplasia, it is vital to develop now approaches toward treating malignant tumors.
This paper reviews innovational experimental approaches to treating malignant malformations based on the use of gene-targeted drugs, such as antisense oligonucleotides (asON), small interfering rnA (siRNA), ribozymes, and DNAzymes, which can all inhibit oncogene expression. The target genes for these drugs are thoroughly characterized, and the main results from pre-clinical and first-step clinical trials of these drugs are presented. It is shown that the gene-targeted
oligonucleotides show considerable variations in their effect on tumor tissue, depending on the target gene in question. The effects range from slowing and stopping the proliferation of tumor cells to suppressing their invasive capabilities. Despite their similarity, not all the antisense drugs targeting the same region of the mRNA of the target-gene were equally effective. the result is determined by the combination of the drug type used and the region of the target-gene mRNA
that it complements.
cancer therapy, antisense oligonucleotides, ribozymes, DNAzymes, small interfering RNA
V.V. Terskikh*, Ye. A. Vorotelyak, A.V. Vasiliev
N.K. Koltsov Institute of Developmental Biology, Russian Academy of Sciences
Asymmetric division is one of the most fundamental characteristics of adult stem cells , which ensures one daughter cell maintains stem cell status and the other daughter cell becomes committed to differentiation. New data emerged recently that allow us to conclude that asymmetric division has another important aspect: it enables self-maintenance of stem cells.
asymmetric division, stem cells, aging of stem cells, self-renewal of stem cells, aggresomes, Drosophila neuroblasts.
Covalent Binding Antibodies Suppress Advanced Glycation: On the Innate Tier of Adaptive Immunity
T. Shcheglova2, S. P. Makker1, and A. Tramontano1* 1Department of Pediatrics, University of California, Davis – School of Medicine Davis 2Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences
Non-enzymatic protein glycation is a source of metabolic stress that contributes to cytotoxicity and tissue damage. Hyperglycemia has been linked to elevation of advanced glycation Endproducts, which mediate much of the vascular pathology leading to diabetic complications. enhanced glycation of immunoglobulins and their accelerated vascular clearance is proposed as a natural mechanism to intercept alternative advanced glycation endproducts, thereby mitigating microvascular disease. We reported that antibodies against the glycoprotein KLH have elevated reactivity for glycopeptides from diabetic serum. These reactions are mediated by covalent binding between antibody light chains and carbonyl groups of glycated peptides. Diabetic animals that were immunized to induce reactive antibodies had attenuated diabetic nephropathy, which correlated with reduced levels of circulating and kidney-bound glycation products. Molecular analysis of antibody glycation revealed the preferential modification of light chains bearing germline-encoded lambda V regions. We previously noted that antibody fragments carrying V regions in the germline configuration are selected from a human Fv library by covalent binding to a reactive organophosphorus ester. These Fv fragments were specifically modified at light chain V region residues, which map to the combining site at the interface between light and heavy
chains. These findings suggest that covalent binding is an innate property of antibodies, which may be encoded in the genome for specific physiological purposes. This hypothesis is discussed in context with current knowledge of the natural antibodies that recognize altered self molecules and the catalytic autoantibodies found in autoimmune disease.
E.G. Salina, H.J. Mollenkopf, S.H.E. Kaufmann, A.S. Kaprelyants
M. tuberculosis Gene Expression during Transition to the “Non-Culturable” State
E.G. Salina1, H.J. Mollenkopf2*, S.H.E. Kaufmann2, A.S. Kaprelyants1 1A.N. Bach Institute of Biochemistry, RAS 2Max Planck Institute for Infection Biology
We analyzed the gene expression profile under specific conditions during reversible transition of M. tuberculosis cells to the “non-culturable” (nc) state in a prolonged stationary phase. More than 500 genes were differentially regulated, while 238 genes were upregulated over all time points during nc cell formation. Approximately a quarter of these upregulated genes belong to insertion and phage sequences indicating a possible high intensity of genome modification processes taking place under transition to the nc state. Besides the high proportion of hypothetical/conserved hypothetical genes in the cohort of upregulated genes, there was a significant number of genes belonging to intermediary metabolism, respiration, information pathways, cell wall and cell processes, and genes encoding regulatory proteins. We conclude that nc cell formation is an active process involved in the regulation of many genes of different pathways. A more detailed analysis of the experimental data will help to understand the precise molecular mechanisms of dormancy/latency/persistence of M. tuberculosis in the future. The list of upregulated genes obtained in this study includes many genes found to be upregulated in other models of M. tuberculosis persistence. Thirteen upregulated genes, which are common for different models, can be considered as potential targets for the development of new anti-tuberculosis drugs directed mainly against latent tuberculosis.
M. tuberculosis, latent tuberculosis, "non-culturable" cells, global gene expression profile
E.S. Knyazhanskaya, M.A. Smolov, O.V. Kondrashina, M.B. Gottikh
Relative Comparison of Catalytic Characteristics of Human Foamy Virus and HIV-1 Integrases
E. S. Knyazhanskaya1, M. A. Smolov2, O. V. Kondrashina2, M. B. Gottikh3* 1Chemistry Department of MSU 2Department of Bioengineering and Bioinformatics of MSU 3A. N. Belozersky Institute of Physico-Chemical Biology, M. V. Lomonosov Moscow State University
Due to their ability to integrate into the host cell’s genome, retroviruses represent an optimal basis for the creation of gene therapy vectors. The integration reaction is carried out by a viral enzyme integrase: thus, a detailed research of this enzyme is required. In this work, the catalytic properties of human foamy virus integrase were studied. This virus belongs to the retroviridae family. The dissociation constant was determined, together with the kinetics of integrase catalytic activity. The data obtained were compared to those for the human immunodeficiency virus integrase and a considerable similarity in the activity of the two enzymes was observed.
HIV Human immunodeficiency virus, HFV Human foamy virus, integrase, catalytic activity
D.M. Shcherbakova, M.I. Zvereva, and O.A. Dontsova
Telomerase Complex from Yeast Saccharomyces cerevisiae Contains a Biotinylated Component
D.M. Shcherbakova, M.I. Zvereva,* and O.A. Dontsova
Department of Chemistry, Moscow State University
Telomerase adds telomeric repeats to single-stranded DNA at the ends of the chromosomes. This enzyme is a ribonucleoprotein complex. Telomerase from yeast Saccharomyces cerevisiae consists of TLC1 RNA, which serves as a template for the synthesis of telomeric repeats, telomerase reverse transcriptase Est2p, and a number of accessory proteins (Est1p, Est3p, Ku70/Ku80, and Sm-complex). We found that the yeast telomerase complex contains a biotinylated component. The telomerase fraction containing biotinylated protein is active in vitro and constitutes a small part of the total amount of active telomerase isolated from cells. We speculate about the nature of the biotinylated component.
yeast telomerase, biotin, biotinylation.
DEAE-fraction – telomerase isolated from yeast extract using chromatography on DEAE-cellulose
P.V. Spirin, D. Baskaran, P.M. Rubtsov, M.A. Zenkova, V.V. Vlassov, E.L. Chernolovskaya, V.S. Prassolov
A Comparison of Target Gene Silencing using Synthetically Modified siRNA and shRNA that Express Recombinant Lentiviral Vectors
P.V. Spirin, D. Baskaran, P.M. Rubtsov, M.A. Zenkova, V.V. Vlassov, E.L. Chernolovskaya,
Engelghardt Institute of Molecular Biology, Russian Academy of Sciences
Institute of Chemical Biology and Fundamental Medicine, Siberian Branch, Russian Academy of Sciences
RNA-interference is an effective natural mechanism of post-transcriptional modulation of gene expression. RNA-interference mechanism exist as in high eukaryotes both animals and plants as well in lower eukaryotes and viruses. RNA-interference is now used as a powerful tool in study of functional gene activity and many essential for fundamental biology results was obtained with this approach. Also it’s widely believed that RNA-interference could be used in working out of new therapeutic medicine against malignant, infectious and hereditary diseases. One of the main problems of these developments is search of effective methods of siRNA transfer into the target cells. At present time for these purpose different sorts of transfect ions or viral transduction are used. At present article the results of comparison of inhibition of expression of oncogene AML-ETO by synthetic siRNA and by recombinant lentiviruses coding for corresponding shRNA are presented.
M.V. Shutova, A.N. Bogomazova,
M.A. Lagarkova, S.L. Kiselev
Generation and Characterization of Human Induced Pluripotent Stem Cells
M.V. Shutova, A.N. Bogomazova, M.A. Lagarkova, S.L. Kiselev*
Vavilov Institute of General Genetics, Russian Academy of Sciences
Cell biology is one of the most rapidly developing branches in modern biology. The most interesting stages in early embryonic development for cell biology are those when a large number of cells are pluripotent. Inner-cell mass of blastocyst can be cultivated in vitro, and these cells are called embryonic stem cells. They are able to differentiate into different types of cells and tissues. But the greatest interest for practical application is the return (reprogramming) of
adult cells into the pluripotent state. In our study for the first time induced pluripotent cells were derived from human umbilical vein endothelial cells by genetic reprogramming. We showed that these cells are similar to embryonic stem cells in their morphology, function, and molecular level. We are the first to show that reprogramming sufficiently changes X-chromosome chromatin state, which is normally inactive in female endothelial cells, towards its activation, providing evidence that endothelial cells are reprogrammed at an epigenetic level.
Influence of pub Gene Expression on Differentiation of Mouse Embryonic Stem Cells into Derivatives of Ecto-, Meso-, and Endoderm in vitro
E.V. Novosadova, E.S. Manuilova, E.L. Arsenieva, A.N. Lebedev, N.V. Khaidarova, V.Z. Tarantul, and I.A. Grivennikov*
Institute of Molecular Genetics, Russian Academy of Sciences
The influence of low and high pub gene expression on the initial stages of the differentiation of mouse embryonic stem cells into derivatives of ecto-, meso-, and endoderm in vitro was investigated. As follows from the results of a RT-PCR analysis, the expression of the vimentin, somatostatin, GATA 4, and GATA 6 genes, being the markers of endodermal differentiation, does not vary in both the cells with high pub gene expression and the cells with low pub gene expression, as well as in the corresponding control lines. The cells with high pub gene expression are characterized by an increase in the expression of mesodermal differentiation gene-markers (trI card, trI skel, c-kit, and IL-7), whereas the cells with low pub gene expression are specified by a decrease in their expression. According to the analyses carried out, the reverse is characteristic of the expression of ectodermal differentiation gene-markers (nestin, β-III tubulin, gfap, and th). Expression of these genes decreases in cell lines with high pub gene expression, whereas their expression increases with the decrease in pub gene expression. Hence, it is suggested that the variations in the pub gene expression in the embryonic stem cells influence significantly the mesodermal and ectodermal differentiation of these cells.
D.A. Davydova, E.A.Vorotelyak, Yu.A. Smirnova, R.D. Zinovieva, Yu. A. Romanov, N. V. Kabaeva, V.V. Terskikh, and A.V. Vasiliev
Cell Phenotypes in Human Amniotic Fluid
D.A. Davydova1*, E.A.Vorotelyak1, Yu.A. Smirnova1, R.D. Zinovieva1, Yu.A. Romanov2, N.V. Kabaeva2, V.V. Terskikh1, and A.V. Vasiliev1 1Koltzov Institute of Developmental Biology, Russian Academy of Sciences 2Russian Cardiology Research-and-Production Complex
Stem cells capable of long-term proliferation and differentiation into different cell types may be a promising source of cells for regenerative medicine. Recently, much attention has been paid to fetal stem cells, among which are cells from amniotic fluid (AF). We have isolated amniotic stem cells from 3 AF samples. Flow cytometry, RT-PCR and immunohistochemistry have shown that these cells express mesenchymal (CD90, CD73, CD105, CD13, CD29, CD44, and CD146), neural (β3-tubulin, nestin, and Pax6), epithelial (keratin 19 and p63) markers and also markers of pluripotency (Oct4, Nanog, and Rex-1). Transplantation of the cells to nude mice does not lead to tumor formation. Thus, putative stem/progenitor cells from AF are capable of long-term proliferation in vitro and the profile of gene expression led us to speculate that they have greater differentiation potential than mesenchymal stem cells and may be useful for cell therapy.
Pacific Institute of Bioorganic Chemistry, Far-eastern Branch of the Russian Academy of Science
The investigation of marine natural products (low molecular weight bioregulators) is a rapidly developing scientific field at the intersection of biology and chemistry. Investigations aimed at detecting, identifying, and understanding the structure of marine natural products have led to the discovery of 20,000 new substances, including those characterized by an extremely high physiological activity. Some results and prospects of works aimed at creating new drugs on the
basis of marine natural products are discussed herein.
HIV- human immunodeficiency virus, AIDS – acquired immune deficiency syndrome, PIBOc – Pacific Institute of Bioorganic chemistry, EC50 – effective concentration that provokes a response halfway between the baseline and maximum response, IC50 – concentration that provokes 50% inhibition, VEGF – vascular endothelial growth factor.
Influenza Virus Neuraminidase: Structure and Function
Y.A. Shtyrya, L.V. Mochalova, N.V. Bovin*
Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, RAS
The structure of the influenza virus neuraminidases, the spatial organization of their active site, the mechanism of carbohydrate chains desialylation by neuraminidase, and its role in the influenza virus function at different stages of the viral infectious cycle are considered in this review. Data on the neuraminidase substrate specificity and different approaches in studying the activity of this enzyme are summarized. In addition, data on neuraminidase inhibitors (as antivirals) are provided, along with considerations on the mechanisms of resistance of modern influenza viruses to those antivirals.
Phage Display on the Base of Filamentous Bacteriophages: Application for Recombinant Antibodies Selection
N.V. Tikunova*, V.V. Morozova
Institute of Chemical Biology and Fundamental Medicine, Siberian Branch, Russian Academy of Science
The display of peptides and proteins on the surface of filamentous bacteriophage is a powerful methodology for selection of peptides and protein domains, including antibodies. An advantage of this methodology is the direct physical link between the phenotype and the genotype, as an analyzed polypeptide and its encoding DNA fragment exist in one phage particle. Development of phage display antibody libraries provides repertoires of phage particles exposing antibody fragments of great diversity. The biopanning procedure facilitates selection of antibodies with high affinity and specificity for almost any target. This review is an introduction to phage display methodology. It presents recombinant antibodies display in more details, construction of phage libraries of antibody fragments and different strategies for the biopanning procedure.
phage display, filamentous bacteriophages, phagemids, phage display libraries of antibody fragments, biopanning, single chain antibody fragments, Fab-fragments.
Genetic View on the Phenomenon of Combined Diseases in Man
V.P. Puzyrev*, M.B. Freidin
Research Institute for Medical Genetics, Siberian Branch, Russian Academy of Medical Sciences
In clinical medicine, the phenomenon of polypathy, as a particular object of investigation, was first put forth by French clinicians at the end of the 19th century through the “arthritismus” doctrine. In the first half of the 20th century, German paediatricians singled out “syntropias,” which are combinations of diseases with common pathophysiological mechanisms, and “dystropias,” which are diseases that rarely co-occur in one individual. In the present paper, syntropy/dystropy is defined as a natural generic nonrandom phenomenon with an evolutionary-genetic basis. The genes involved in the development of syntropy are called “syntropic genes,” whereas the genes that co-participate in pathophysiological mechanisms and prevent the co-occurrence of particular phenotypes are called “dystropic genes.” Prospects for studying the genetic basis of this phenomenon are highlighted. The publicly available database HuGENet can be used in order to identify syntropic genes, as will be shown as examples in an analysis of cardiovascular diseases.
syntropy, dystropy, syntropic and dystropic genes, genome, phenome, HuGENet.
Achievements and Peculiarities in Studies of Ancient DNA and DNA from Complicated Forensic Specimens
A.P. Grigorenko1,2,3, S.A. Borinskaya1, N.K. Yankovsky1, E.I. Rogaev1,2,3* 1Vavliov Institute of General Genetics, Russian Academy of Sciences 2Research Center of Mental Health, Russian Academy of Medical Sciences 3University of Massachusetts Medical School, Worcester, U.S.A.
* E-mail: firstname.lastname@example.org
Studies of ancient DNA specimens started 25 years ago. At that time short mitochondrial DNA (mtDNA) fragments were the main targets in ancient DNA studies. The last three years were especially productive in the development of new methods of DNA purification and analysis. Complete mtDNA molecules and relatively large fragments of nuclear DNA are the targets of ancient DNA studies today. Ancient DNA studies allowed us to study organisms that went extinct more than ten thousand years ago, to reconstruct their phenotypic traits and evolution. Ancient DNA analyses can help understand the development of ancient human populations and how they migrated. A new evolutionary hypothesis and reconstruction of the biota history have been re-created from recent ancient DNA data. Some peculiarities and problems specific to the study of ancient DNA were revealed, such as very limited amounts of DNA available for study, the short length of the DNA fragments, breaks and chemical modifications in DNA molecules that result in “postmortem” mutations or complete blockage of DNA replication in vitro. The same specific features of DNA analysis were revealed for specimens from complicated forensic cases that result in the lack of experimental data or interpretation problems. Here, we list the specific features of ancient DNA methodology and describe some achievements in fundamental and applied research of ancient DNA, including our own work in the field.
ancient DNA, methods, evolution, DNA identification, forensic examination.
mtDNA – mitochondrial DNA, cmtDNA – complete mtDNA sequence, STR – short tandem repeats
D-Arabinose Methabolism: Characterization of Bifunctional Arabinokinase/ Pyrophosphorylase of Leishmania major
N.M. Novozhilova*, N.V. Bovin
Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, RAS
In this work we describe an unusual enzyme from Leishmania major (Arabinokinase / Pyrophosphorylase) that catalyzes the synthesis of GDP-Darabinopyranose (GDP-D-Arap) via a D-arabinose-1-phosphate intermediate in the presence of ATP and GTP. Our data indicate GDP-D-Arap transport in vivo by the LPG2 multispecific nucleotide sugar transporter into the Leishmania Golgi apparatus, in which it can be used by glycosyltransferases as a donor substrate for glycosylation.
Atomic Resolution Crystal Structure of NAD+-Dependent Formate Dehydrogenase from Bacterium Moraxella sp. C-1
I.G. Shabalin1, K.M. Polyakov2,1, V.I. Tishkov1, V.O. Popov1* 1A.N. Bach Institute of Biochemistry RAS 2V.A. Engelhardt Institute of Molecular Biology RAS
The crystal structure of the ternary complex of NAD+-dependent formate dehydrogenase from the methylotrophic bacterium Moraxella sp. С-1 with the cofactor (NAD+) and the inhibitor (azide ion) was established at 1.1 Å resolution. The complex mimics the structure of the transition state of the enzymatic reaction. The structure was refined with anisotropic displacements parameters for non-hydrogen atoms to a R factor of 13.4%. Most of the nitrogen, oxygen, and carbon atoms were distinguished based on the analysis of the temperature factors and electron density peaks, with the result that side-chain rotamers of histidine residues and most of asparagine and glutamine residues were unambiguously determined. A comparative analysis of the structure of the ternary complex determined at the atomic resolution and the structure of this complex at 1.95 Å resolution was performed. In the atomic resolution structure, the covalent bonds in the nicotinamide group are somewhat changed in agreement with the results of quantum mechanical calculations, providing evidence that the cofactor acquires a bipolar form in the transition state of the enzymatic reaction.
I.V. Shapovalova, W.B.L. Alkema, O.V. Jamskova, E. de Vries, D.T. Guranda, D.B. Janssen, V.K. Švedas
Mutation of Residue ßF71 of Escherichia coli Penicillin Acylase Results in Enhanced Enantioselectivity and Improved Catalytic Properties
I.V. Shapovalova1, W.B.L. Alkema2, O.V. Jamskova1, E. de Vries2, D.T. Guranda1, D.B. Janssen2, V.K. Švedas1* 1Belozersky Institute of Physicochemical Biology and Faculty of Bioengineering and Bioinformatics, Lomonosov Moscow State University, Russia 2Department of Biochemistry, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Netherlands
Residue phenylalanine 71 of the β-chain of penicillin acylase from E. coli is involved in substrate binding and chiral discrimination of its enantiomers. Different amino acid residues have been introduced at position βF71, and the mutants were studied with respect to their enantioselectivity and substrate specificity. Some mutants demonstrated remarkably improved catalytic activity. Moreover, mutation of βF71 residue allowed to enhance penicillin acylase enantioselectivity. The catalytic activity to the specific substrates was improved up to 36 times, most notably for K, R, and L mutants. Increased activity to a D-phenylglycine derivative – a valuable specificity improvement for biocatalytic synthesis of new penicillins and cephalosporins – was shown for βF71r and βF71L mutants. The synthetic capacity of penicillin acylase with 6-aminopenicillanic acid as an external nucleophile was especially sensitive to mutation of the β71 residue in contrast to the synthesis with 7-aminodeacetoxycephalosporanic acid.
Combining Two Technologies for Full Genome Sequencing of Human
K.G. Skryabin1, E.B. Prokhortchouk1*, A.M. Mazur1, E.S. Boulygina1, S.V. Tsygankova1, A.V. Nedoluzhko1, S.M. Rastorguev1, V.B. Matveev2, N.N. Chekanov3, D.A. Goranskaya3, A.B. Teslyuk1, N.M. Gruzdeva1, V.E. Velikhov1, D.G. Zaridze2, M.V. Kovalchuk1 1Russian Research Centre Kurchatov Institute 2Institute of Carcinogenesis, Blokhin Cancer Research Center, Russian Academy of Medical Sciences 3Bioengineering Center, Russian Academy of Sciences
At present, the new technologies of DNA sequencing are rapidly developing allowing quick and efficient characterisation of organisms at the level of the genome structure. In this study, the whole genome sequencing of a human (Russian man) was performed using two technologies currently present on the market - Sequencing by Oligonucleotide Ligation and Detection (SOLiDTM) (Applied Biosystems) and sequencing technologies of molecular clusters using fluorescently labeled precursors (Illumina). The total number of generated data resulted in 108.3 billion base pairs (60.2 billion from Illumina technology and 48.1 billion from SOLiD technology). Statistics performed on reads generated by GAII and SOLiD showed that they covered 75% and 96% of the genome respectively. Short polymorphic regions were detected with comparable accuracy however, the absolute amount of them revealed by SOLiD was several times less than by GAII. Optimal algorithm for using the latest methods of sequencing was established for the analysis of individual human genomes. The study is the first Russian effort towards whole human genome sequencing.
human genome, sequencing technology, single-nucleotide polymorphism
Indel SNP – insertion/deletion type single-nucleotide polymorphism.
Cell Regulation of Proliferation and Differentiation ex vivo for Cells Containing Ph Chromosome in Chronic Myeloid Leukemia
N.I. Grineva*, T.V. Akhlynina, L.P. Gerasimova, T.E. Manakova, N.G. Sarycheva, D.A.Schmarov, A.M. Tumofeev, N.M. Nydenova, L.Yu. Kolosova, T.I. Kolosheynova, L.G. Kovaleva, S.V. Kuznetsov, A.V. Vorontsova, A.G. Turkina
GU National Research Center for Hematology, Russian Academy of Medical Sciences
Cell regulation of Ph+ cell proliferation and differentiation has been studied ex vivo in various chronic myeloid leukemia (CML) patients. The regulation is provided by alternation of effective stages of proliferation and maturation with inhibition of Ph+ cell proliferation by accumulating neutrophils under apoptosis blockage. The alternation of stages consists of switching stage 1 (effective proliferation) to stage 2 (effective maturation) and proceeds according to the 1/2 -1/2/1 or 2/1-2/1/2/1 schemes. The kinetic plots of alternations pass through control points of crossing plots, where the parameters of proliferation and maturation are equal. The indices of P/D efficiency (ratio of proliferation and maturation rates) are 1.06±0.23 and don’t depend on time, alternation order, or sources of Ph+ cells – CML patients. During stages alternation, conversely, the parameters of Ph+ cell proliferation and maturation vary. The proliferation stages are characterized by increased proliferating cells content, a decreased number of neutrophils, and apoptosis induction. At the maturation stages, conversely, apoptosis is inhibited, the number of mature neutrophils increases, while immature Ph+ cells decrease. High content neutrophils inhibit the proliferation of Ph+ cells and impair their own maturation by inversion of maturation order, probably through a feedback mechanism. The regulation differences ex vivo reveal three types of Ph+ cells from various individual CML patients, distinguished by the number and duration of alternating stages of proliferation and maturation. Ph+ cells types 1 and 2 have one prolonged stage of effective proliferation or effective maturation with efficiency indices P/D1 = 1-20 or P/D2 ≤ 1. At the same time period, the proliferation and differentiation of the Ph+ cells type 3 proceeds with repeated alternations of stages with P/D1 = 1-4 or P/D2 ≤ 1. Type 1 Ph+ cells (~20%) were isolated from patients in advanced stages of CML, while Ph+ cells types 2 and 3 (30 and 50% correspondingly) were isolated from CML chronic phase patients sensitive to chemotherapy.
regulation of Ph+ cell proliferation and Ph+ cell by mature cells, cultivation of hematopoietic Ph+ mononuclear cells, kinetics of Ph+ cell proliferation and differentiation in vitro, Ph+ cells apoptosis, Ph+ cell distribution in cell cycle phases, Ph+ cell proliferation and differentiation efficacy, inversion of accumulation order for maturating neutrophils, chronic myeloid leukemia.
P&D – proliferation and differentiation; CML – chronic myeloid leukemia; Ph – Philadelphia chromosome; MM, B, S, – metamyelocytes, band and segmented neutrophils; Ph+ cells – hematopoietic cells with Philadelphia chromosome; PB – peripheral blood ; BM – bone marrow; CP, AP, BP – chronic phase, accelerated phase and blastic phase of CML; FCS – fetal calf serum.
Study of Molecular Mechanisms Involved in the Pathogenesis of Immune-Mediated Inflammatory Diseases, using Psoriasis As a Model
E.S. Piruzian1*, V.V. Sobolev1, R.M. Abdeev2, A.D. Zolotarenko1, A.A. Nikolaev1, M.K. Sarkisova1, M.E. Sautin1, A.A. Ishkin1, An.L. Piruzyan2, S.A. Ilyina2, I.M. Korsunskaya2, O.Y. Rahimova3, S.A. Bruskin1 1Vavilov Institute of General Genetics, Russian Academy of Sciences 2Center for Theoretical Problems of Physicochemical Pharmacology, Russian Academy of Sciences 3Moscow Municipal Hospital № 24, Department of Health
* E-mail: email@example.com
Psoriasis was used as a model to analyze the pathogenetic pathways of immune-mediated inflammatory diseases, and the results of bioinformatic, molecular-genetic and proteomic studies are provided. Cell mechanisms, common for the pathogenesis of psoriasis, as well as Crohn’s disease, are identified. New approaches for immune-mediated diseases are discussed.
Chemical and Functional Aspects of Posttranslational Modification of Proteins
D.G. Knorre, N.V. Kudryashova, T.S. Godovikova*
Institute of Chemical Biology and Fundamental Medicine, Siberian Branch, Russian Academy of Sciences
This paper reviews the chemical and functional aspects of the posttranslational modifications of proteins, which are achieved by the addition of various groups to the side chain of the amino acid residue backbone of proteins. It describes the main prosthetic groups and the interaction of these groups and the apoenzyme in the process of catalysis, using pyridoxal catalysis as an example. Much attention is paid to the role of posttranslational modification of proteins in
the regulation of biochemical processes in live organisms, and especially to the role of protein kinases and their respective phosphotases. Methylation and acetylation reactions and their role in the “histone code,” which regulates genome expression on the transcription level, are also reviewed. this paper also describes the modification of proteins by large hydrophobic residues and their role in the function of membrane-associated proteins. Much attention is paid to the glycosylation of proteins, which leads to the formation of glycoproteins. We also describe the main non-enzymatic protein modifications such as glycation, homocysteination, and desamidation of amide residues in dibasic acids.
CoA – coenzyme A, EGFR – epidermal growth factor receptor, JNK – Jun N-terminal kinase, SAPK – stress activated protein kinase, МАРК – mutagen-activated protein kinase, IF – inositoltriphosphate, DAG – diacylglycerol, JAK – Janus kinase, STAT - signal transducer and activator of transcription, Fyn, Lck – non-receptor tyrosinekinases of the Src family, Ub – ubiquitin residue, ULP – ubiquitin-like protein, ras, rab, rho – protein products of the protooncogenes ras, rab, rho, which play a role in cell growth and differentiation, SАМ – S-adenosylmethinone, PARP – poly(ADP-ribose)polymerase, VRAP – telomerase, found to be a part of vault particles, GSH – glutathione, HIF – hypoxia inducible factor, Gla – γ-carboxyglutamic acid, AGE – advanced glycation end products, CML – Nε-carboxymethyl-lysine, CEL – Nε-carboxyethyl-lysine, HSA – human serum albumin, GFP – green fluorescent protein, РIMT – protein isoaspartyl-О-methyltransferase, DNT – dermonecrotic toxin.
Genome Paths: a Way to Personalized and Predictive Medicine
Ott’s Institute of Obstetrics and Gynecology, Russian Academy of Medical Sciences
The review is devoted to the impact of human genome research on progress in modern medicine. Basic achievements in genome research have resulted in the deciphering of the human genome and creation of a molecular landmarks map of the human haploid genome (HapMap Project), which has made a tremendous contribution to our understanding of common genetic and multifactorial (complex) disorders. current genome studies mainly focus on genetic testing and
gene association studies of multifactorial (complex) diseases, with the purpose of their efficient diagnostics and prevention . Identification of candidate (“predisposition”) genes participating in the functional genetic modules underlying each common disorder and the use of this genetic background to elaborate sophisticated measures to efficiently prevent them constitutes a major goal in personalized molecular medicine. The concept of a genetic pass as an individual DNA databank reflecting inherited human predisposition to different complex and monogenic disorders, with special emphasis on its present state, and the numerous difficulties related to the practical implementation of personalized medicine are outlined. The problems related to the uncertainness of the results of genetic testing could be overcome at least partly by means of new technological achievements in genome research methods, such as genome-wide association studies (GWAS), massive parallel DNA sequencing, and genetic and epigenetic profiling. The basic tasks of genomic today could be determined as the need to properly estimate the clinical value of genetic testing and its applicability in clinical practice. Feasible ways towards the gradual implementation of personal genetic data, in line with routine laboratory tests, for the benefit of clinical practice are discussed.
Protein Tyrosine Kinase Panel As a Tool for Anticancer Drug Design
T.V. Rakitina1,2*, O.V. Yudkina3,4, E.V. Smirnova1, A.V. Lipkin3,4 1Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences 2A.N. Bakh Institute of Biochemistry, Russian Academy of Sciences 3Institute of Crystallography, Russian Academy of Sciences 4Russian Research Center Kurchatov Institute
The discovery of the pharmaceutical potential of small molecule inhibitors of oncogenic protein tyrosine kinases is one of the directions in target therapy in oncology. Presently, investigations aiming at developing new therapeutically important inhibitors have to be based on a combination of computational and experimental approaches including biochemical, cell-based or in silico screening and the study of the three-dimensional structure of the kinase active center, in complex with an inhibitor, using crystallography and X-ray analysis or molecular modeling. this work is an example of a combination of inhibitor experimental search with the computational analysis of the potential mechanism of the inhibitors’ action, which allowed to propose the 2-hydroxyphenol group as a scaffold for the design of new tyrosine kinase inhibitors.
protein tyrosine kinases; small molecule inhibitors; screening; 2-hydroxyphenol group
Genotoxic Effects of Silver Nanoparticles on Mice in Vivo
C.G. Ordzhonikidze1, L.K. Ramaiyya1, E.M. Egorova2, A.V. Rubanovich1* 1Vavilov Institute of General Genetics, Russian Academy of Sciences 2Institute of General Pathology and Pathophysiology, Russian Academy of Medical Sciences Science-Technology Company "Nanomet"
The toxic and genotoxic effects of silver nanoparticles were studied on injected mice (BALB/c line) in vivo. A water solution of silver nanoparticles (SNP) with particle sizes of 9±6 nm was obtained by means of the original method of biochemical synthesis. The effect of the SNP solution was compared to those of AOT (anionic surfactant used as SNP stabilizer) and silver nitrate (i.e. Ag+ ions) introduced as water solutions. In studies of the toxic effects, the death of mice was registered 12-24 hours after injection only at two maximum dozes of SNP (equivalent to 0.54 and 0.36 gAg/l). It is shown that the toxic effect decreases in the sequence SNP>AOT>>AgNO3. The LE50/30 values for SNP and AOT are equal to 0.30±0.07 gAg/l and 13.3±2.1 gAg/l, respectively. Genotoxic effects were assessed by the abnormal sperm heads test and neutral comet assay. the frequencies of abnormal sperm heads (ASHs) did not differ after treatment by SNP and AOT, but both were significantly higher than those found with AgNO3 and in control mice. Comet assay showed an increase of the DNA percentage in the comet tail in spleen cells after the injection of SNP and AOT in concentrations of ? Le50/30. Tail DNA % was 32.8±1.3 and 26.3±1.7%, respectively, vs 16.2±0.7% for the untreated control. To sum up, these tests showed that the genotoxic effects of the SNP solution are associated with the presence of AOT rather than SNP.
Deamination of 5-Methylcytosine Residues in Mammalian Cells
E.V. Gromenko1, P.V. Spirin2, E.A. Kubareva3, E.A. Romanova3, V.S. Prassolov2, O.V. Shpanchenko1, O.A. Dontsova1,3* 1Department of Chemistry, Lomonosov Moscow State University 2Engelhardt Institute of Molecular Biology, Russian Academy of Sciences 3Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University
DNA demethylation in mammalia occurs after fertilization and during embryogenesis and accompanies cell aging and cancer transformation. With the help of the primer extension reaction, MALDI MS and DNA cleavage by thymine DNA glycosylase deamination of 5-methylcytosine residues has been shown to take place when the model methylated DNA duplexes are treated with nuclear extracts from the cell lines СНO, HeLa, and Skov3. The hypothesis that deamination of 5-methylcytosine is the first stage of demethylation in mammalia has been postulated.
deamination of 5-methylcytosine, 5-methylcytosine demethylation, the reaction of primer extension, MALDI MS, thymine DNA glycosylase.
mC – 5-methyl-2’-deoxycytidine, PCR – polymerase chain reaction, PAAG – polyacrylamide gel, TDG – thymine DNA glycosylase, MALDI MS – matrix-assisted laser desorption/ionisation mass spectrometry.
Mechanisms of Gravitational Sensitivity of Osteogenic Precursor Cells
L.B. Buravkova, P.M. Gershovich, J.G. Gershovich*, A.I. Grigor'ev
State Scientific Centre of Russian Federation – Institute for biomedical problems RAS
This report is a detailed review of the current data on mechanic and gravitational sensitivity of osteoblasts and osteogenic precursor cells in vitro. It summarizes the numerous responses of cells with an osteoblastic phenotype and osteogenic precursor cells and especially their responses to the alteration of their mechanic or gravitational surroundings. The review also discusses the osteogenic cell’s pathways of signal transduction and the mechanisms of
gravitational sensitivity. It was shown, that the earliest multipotent stromal precursor cells of an adult organism’s bone marrow can sense changes of intensity in a gravitational or mechanic field in model conditions, which may play a certain role in the development of osteopenia in microgravity.
Regulation of Immunogen Processing: Signal Sequences and their Application for the New Generation of DNA-Vaccines
E.S. Starodubova1*, M.G. Isaguliants2,3*, V.L. Karpov1 1Engelhardt Institute of Molecular Biology, Russian Academy of Science 2Karolinska Institutet, Sweden. 3Ivanovsky Institute of Virology, Russian Academy of Medical Science
* E-mail: firstname.lastname@example.org , email@example.com
Immunization with naked genes (DNA-immunization) is a perspective modern approach to prophylactic as well as therapeutic vaccination against pathogens, as well as cancer and allergy. A panel of DNA immunogens has been developed, some are already in the clinical trials. However, the immunogenicity of DNA vaccines, specifically of those applied to humans, needs a considerable improvement. There are several approaches to increase DNA vaccine immunogenicity. One approach implies the modifications of the encoded immunogen that change its processing and
presentation, and thus the overall pattern of anti-immunogen response. For this, eukaryotic expression vectors are constructed that encode the chimeric proteins composed of the immunogen and specialized targeting or signal sequences. The review describes a number of signals that if fused to immunogen, target it into the predefined subcellular compartments. The review gives examples of their application for DNA-immunization.
ER - endoplasmic reticulum, Ub - ubiquitin, HCV - human hepatitis C virus, ODC - Ornithine decarboxylase, RT - HIV-1 reverse transcriptase, CRT - Ca2+ - binding protein calreticulin, HVP-16 - human papilloma virus 16, LAMP-1 - lysosome-associated protein 1, sarsN - nucleocapsid SARS coronavirus protein, LCMV – lymphocytic choriomeningitis virus, MHC I - major histocompatibility complex class I, MHC II - major histocompatibility complex class II
A.V. Letarov, A.K. Golomidova, K.K. Tarasyan
Winogradsky Institute of Microbiology RAS
Understanding the mutual interactions of bacterial and phage populations in the environment of a human or animal body is essential in any attempt to influence these complex processes, particularly for rational phage therapy. Current knowledge on the impact of naturally occurring bacteriophages on the populations of their host bacteria, and their role in the homeostasis maintenance of a macro host, is still sketchy. The existing data suggest that different
mechanisms stabilize phage-bacteria coexistence in different animal species or different body sites. The defining set of parameters governing phage infection includes specific physical, chemical, and biological conditions, such as pH, nutrient densities, host prevalence, relation to mucosa and other surfaces, the presence of phage inhibiting substances, etc. Phage therapy is also an ecological process that always implies three components that form a complex pattern of
interactions: populations of the pathogen, the bacteriophages used as antibacterial agents, and the macroorganism. We present a review of contemporary data on natural bacteriophages occuring in human- and animal- body associated microbial communities, and analyze ecological and physiological considerations that determine the success of phage therapy in mammals.
bacteriophages, phage therapy, human body microbiota, animal body microbiota, bacteriophage ecology
GIT – gastro-intestinal tract, PFU – plaque-forming unit, which corresponds to a one viable bacteriphage particle, if the efficiency of infection in these conditions and in this strain is close to 1; CFU – colony-forming unit, which corresponds to a one viable bacterial cell.
O.A. Patutina1, N.L. Mironova1, E.I. Ryabchikova1, N.A. Popova2, V.P. Nikolin2, V.I. Kaledin2, V.V. Vlassov1, and M.A. Zenkova1* 1Institute of Chemical Biology and Fundamental Medicine, Siberian Branch, Russian Academy of Sciences 2Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences
In our work the antitumor and antimetastatic activities of RNase A and DNase I were studied using two murine models of pulmonary (Lewis lung carcinoma) and liver (hepatoma A-1) metastases. We found that intramuscular administration of RNase A at the dose range of 0.1–50 μg/kg retarded the primary tumor growth by 20–40%, and this effect disappeared with the increase in RNase A dose over 0.5 mg/kg. DNase I showed no effect on the primary tumor growth. The intramuscular administration of RNase A (0.35–7 μg/kg) or DNase I (0.02–2.3 mg/kg) resulted in a considerable decrease in the metastasis number into the lungs of animals with Lewis lung carcinoma and a decrease of the hepatic index of animals with hepatoma 1A. A histological analysis of the organs occupied by metastases revealed that the administration of RNase A and DNase I induced metastasis pathomorphism as manifested by the destruction of oncocytes, an increase in necrosis and apoptosis foci in metastases, and mononuclear infiltration. Our data indicated that RNase A and DNase I are highly promising as supplementary therapeutics for the treatment of metastasizing tumors.
antimetastatic activity, DNase I, RNase A, Lewis lung carcinoma, hepatoma 1A.
Lewis lung carcinoma (LLC), hepatoma 1A (HA-1).
Assessment of Formate Dehydrogenase Stress Stability in vivo using Inactivation by Hydrogen Peroxide
S.S. Savin1,2, V.I. Tishkov1,2,3* 1A.N. Bach Institute of Biochemistry, Russian Academy of Sciences 2Innovations and High Technologies MSU Ltd. 3Division of Chemical Enzymology, Department of Chemistry, M.V. Lomonosov Moscow State University
Kinetic studies on hydrogen peroxide-induced inactivation of mutant formate dehydrogenase from Pseudomonas sp. 101 (PseFDH Cys255Ala) suggest a simple bimolecular mechanism for enzyme reaction with the inactivation agent. In the excess of hydrogen peroxide, the decrease in enzyme activity follows first-order kinetics. Therefore, the first-order effective inactivation kinetic constants determined for various FDH forms at a constant H2O2 concentration can be used as a quantitative measure of the enzyme stability. It was shown that two cysteine residues located in the active site formate- and coenzyme-binding domains (Cys145 and Cys255, respectively) make similar contributions to the enzyme stability, while the contribution of Cys354 is insignificant. The inactivation kinetics of wild-type PseFDH, mutant PseFDH Cys145Ser/Cys255Ala, and FDH produced under stress conditions by bacterium Staphylococcus aureus, higher plants Arabidopsis thaliana, and soya Glycine max, was studied. It was found that the stress-induced FDHs are at least 20 times more stable than the nonstress-induced PseFDH from Pseudomonas sp. 101 grown on methanol.
Changes in the Proteasome Pool During Malignant Transformation of Mouse Liver Cells
T. M. Astakhova, G. V. Delone, Yu. V. Lyupina, E. B. Abramova, I. V. Uryvaeva, N. P. Sharova*
Koltsov Institute for Developmental Biology, Russian Academy of Sciences, 26 Vavilova St., 119334 Moscow, Russia
Multiple forms of proteasomes regulate cellular processes by destroying proteins or forming the peptides involved in those processes. Various pathologies, including carcinogenesis, are related to changes in functioning the proteasome forms. In this study, we looked at the changes in the pool of liver proteasomes during nodular regenerative hyperplasia and formation of adenoma and hepatocellular carcinoma in mice treated with Dipin, followed by partial liver resection. The relative content of various proteasome forms was determined using Western blot analysis. The chymotrypsin-like activity of proteasomes was assessed from the hydrolysis of the commercial Suc-LLVY-AMC substrate. It was found that changes in the proteasome pool appeared already during the formation of diffuse nodules, the changes being the increased expression of the X(β5) constitutive subunit and the LMP7(β5i) and LMP2(β1i) immune subunits, accompanied by the increase of the total proteasome pool and the decrease in the chymotrypsin-like activity.
These changes were more pronounced in hepatocellular carcinoma. The content of the total proteasome pool and the LMP2(β1i) immune subunit and the chymotrypsin-like activity in adenoma were intermediate compared to those in the samples of liver with diffuse nodules and carcinoma. In addition, the level of the Rpt6 subunit present in the 19S proteasome activator was increased in carcinoma. Our results indicate that nodular regenerative hyperplasia and adenomatosis may be stages preceding carcinogenesis. We also conclude that there is a need to find signalling pathways that change the expression of various proteasome subunits during carcinogenesis. The 19S proteasome activator, which is overexpressed in malignant tumours, can be a promising target for the development of new anticancer drugs.
immunoproteasomes, 19S proteasome activator, chymotrypsin-like activity of proteasomes, Western blot analysis, nodular regenerative hyperplasia of the liver, adenoma, hepatocellular carcinoma, mouse liver.
Induction of a Protective Heterosubtypic Immune Response Against the Influenza Virus by Using Recombinant Adenoviral Vectors Expressing Hemagglutinin of the Influenza H5 Virus
М.М. Shmarov1*, E.S. Sedova1, L.V. Verkhovskaya1, I.A. Rudneva2, E.А. Bogacheva1, Yu.А. Barykova1, D.N. Shcherbinin1, А.А. Lysenko1, I.L. Tutykhina1, D.Y. Logunov1, Yu.А. Smirnov2, B.S. Naroditsky1 and A.L. Gintsburg1 1Gamaleya Research Institute of Epidemiology and Microbiology, Russian Academy of Medical Sciences 2Ivanovsky Virology Research Institute, Russian Academy of Medical Sciences
Influenza viruses are characterized by a high degree of antigenic variability, which causes the annual emergence of flu epidemics and irregularly timed pandemics caused by viruses with new antigenic and biological traits. Novel approaches to vaccination can help circumvent this problem. One of these new methods incorporates genetic vaccines based on adenoviral vectors. Recombinant adenoviral vectors which contain hemagglutinin-encoding genes from avian H5N1 and H5N2 (Ad-HA5-1 and Ad-HA5-2) influenza viruses were obtained using the AdEasy Adenoviral
Vector System (Stratagene). Laboratory mice received a double intranasal vaccination with Ad-HA5-1 and Ad-HA5-2. This study demonstrates that immunization with recombinant adenoviruses bearing the Н5 influenza virus hemagglutinin gene induces a immune response which protect immunized mice from a lethal dose of the H5 influenza virus. Moreover, it also protects the host from a lethal dose of H1 virus, which belongs to the same clade as H5, but does not confer protection from the subtype H3 influenza virus, which belongs to a different clade. Our data allow us to conclude that adenoviral vectors may become a universal platform for obtaining vaccines against seasonal and pandemic strains of the influenza virus.
Selectivity of Enzymatic Conversion of Oligonucleotide Probes during Nucleotide Polymorphism Analysis of DNA
O.A. Vinogradova, D.V. Pyshnyi*
Institute of Chemical Biology and Fundamental Medicine, Siberian Division, Russian Academy of Sciences, prosp. Lavrentieva 8, Novosibirsk 630090
The analysis of DNA nucleotide polymorphisms is one of the main goals of DNA diagnostics. DNA-dependent enzymes (DNA polymerases and DNA ligases) are widely used to enhance the sensitivity and reliability of systems intended for the detection of point mutations in genetic material. In this article, we have summarized the data on the selectiveness of DNA-dependent enzymes and on the structural factors in enzymes and DNA which influence the effectiveness of mismatch discrimination during enzymatic conversion of oligonucleotide probes on a DNA template. The data presented characterize the sensitivity of a series of DNA-dependent enzymes that are widely used in the detection of noncomplementary base pairs in nucleic acid substrate complexes. We have analyzed the spatial properties of the enzyme-substrate complexes. These properties are vital for the enzymatic reaction and the recognition of perfect DNA-substrates. We also discuss relevant approaches to increasing the selectivity of enzyme-dependent reactions. These approaches involve the use of modified oligonucleotide probes which “disturb” the native structure of the DNA-substrate complexes.
DNA complexes, mismatch, selectivity, DNA ligase, DNA polymerase, modified oligonucleotide probes.
PCR – polymerase chain reaction, NA – nucleic acid, AdD – nucleotidyltransferase domain of DNA ligases, OB – oligonucleotide/oligosaccharide binding domain of DNA ligases, DBD – DNA binding domain of DNA ligases, HhH – motif of DNA ligases helix-hairpin-helix, Zn – zinc-fingers, BRCT – C-terminal domain of DNA ligases, PNA – Peptide Nucleic Acids, LNA – Locked Nucleic Acid, ENA – Ethylene Nucleic Acid, dNTP – deoxyribonucleosidetriphosphate, PPi – inorganic pyrophosphate, mc – main chain of protein backbone.
University of Texas Southwestern Medical Center, Dallas, Texas, USA
Institute of Cytology, Russian Academy of Sciences, St. Petersburg
Neurodegenerative disorders, such as Alzheimer’s disease (AD), Parkinson’s disease (PD), amyotrophic lateral sclerosis (ALS), Huntington’s disease (HD), and spinocerebellar ataxias (SCA) are very important both for fundamental science and for practical medicine. Despite extensive research into the causes of these diseases, clinical researchers have had very limited progress and, as of now, there is still no cure for any of these diseases. One of the main obstacles in the way of creating treatments for these disorders is the fact that their etiology and pathophysiology still remain unclear. This paper reviews results that support the so-called “calcium hypothesis of neurodegenerative diseases.” The calcium hypothesis states that the atrophic and degenerative processes in the neurons of AD, PD, ALS, HD, and SCA patients are accompanied by alterations in calcium homeostasis. Moreover, the calcium hypothesis states that this deregulation of calcium signaling is one of the early-stage and key processes in the pathogenesis of these
diseases. Based on the results we reviewed, we conclude that the calcium channels and other proteins involved in the neuronal calcium signaling system are potential drug targets for AD, PD, ALS, HD, and SCA therapy.
A.S. Isaeva, E.E. Kulikov, K.K. Tarasyan, A.V. Letarov
A Novel High-Resolving Method for Genomic PCR-fingerprinting of Enterobacteria
A.S. Isaeva, E.E. Kulikov, K.K. Tarasyan, A.V. Letarov*
Winogradsky Institute of Microbiology, Russian Academy of Sciences
We developed a novel PCR-fingerprinting system for differentiation of enterobacterial strains using a single oligonucleotide primer IS1tr that matches the inverted terminal repeats of the IS1 insertion element. Compared to widely used BOX-PCR and ribotyping methods, our system features higher resolution allowing differentiation of closely related isolates that appear identical in BOX-PCR and ribotyping but differ in their phage sensitivity. The IS1-profiling system is less sensitive to the quality of the material and equipment used. At the same time, BOX-PCR is
more universal and suitable for bacterial strain grouping and reconstruction of the low-distance phylogeny. Thus, our system represents an important supplement to the existing set of tools for bacterial strain differentiation; it is particularly valuable for a detailed investigation of highly divergent and rapidly evolving natural bacterial populations and for studies on coliphage ecology. However, some isolates could not be reliably differentiated by IS1-PCR, because of the low number of bands in their patterns. For improvement of IS1-fingerprinting characteristics, we offer to modify the system by introducing the second primer TR8834 hybridizing to the sequence of a transposase gene that is widely spread in enterobacterial genomes.
Penicillin Acylase-Catalyzed Effective and Stereoselective Acylation of 1-phenylethylamine in Aqueous Medium using Non-Activated Acyl Donor
D.T. Guranda, G.A. Ushakov, V.K. Svedas*
Belozersky Institute of Physicochemical Biology, Faculty of Bioengineering and Bioinformatics, Lomonosov Moscow State University, Russia
Until recently the biocatalytic preparation of enantiomerically pure amines was based on stereoselective acyl transfer in an organic medium using activated acyl donors. The possibility of performing an effective and enantioselective enzymatic acylation of amines in an aqueous medium without using activated acyl donors was demonstrated for the first time as the example of direct condensation of phenylacetic acid and racemic 1-phenylethylamine. Direct condensation of the acid and the amine took place at mild reaction conditions with a high initial rate (3.3 µmole/(l•h)), degree of conversion (80% acylation of active amine enantiomer), and enantioselectivity (enantiomeric excess of the product was more than 95%). The suggested approach has remarkable advantages compared to enzymatic reactions in organic media and is of practical value for the biocatalytic preparation of enantiomerically pure compounds at mild conditions using readily available reagents.
stereoselective enzymatic acylation in aqueous medium, direct condensation, enantiomerically pure compounds, penicillin acylase
New 5-Modified Pyrimidine Nucleoside Inhibitors of Mycobacterial Growth
L.A. Alexandrova1*, E.R. Shmalenyuk1, S.N. Kochetkov1, V.V. Erokhin2, T.G. Smirnova2, S.N. Andreevskaia2, and L.N. Chernousova2 1Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, ul. Vavilova 32, Moscow, 119991, Russia 2Central Tuberculosis Research Institute, Russian Academy of Medical Sciences, Yauzskaya alley 2, Moscow, 107564, Russia
The WHO has declared tuberculosis (TB) a global health emergency. Therefore, there is an urgent need to discover and develop new anti-TB drugs. Here we report a new category of 5-substituted pyrimidine nucleosides as potent inhibitors of Mycobacterium tuberculosis growth in vitro. A series of 2'-deoxy-, 3'-azido-2',3'-dideoxy-, and 3'-amino-2',3'-dideoxypyrimidine nucleoside analogues bearing lengthy flexible alkyloxymethyl substituents exhibited marked inhibitory activity against M tuberculosis in vitro. 5-Dodecyloxymethyl-2'-deoxyuridine was found to be a potent inhibitor of M. tuberculosis propagation in vitro. In contrast, monophosphates of the tested nucleosides were devoid of antimycobacterial activity. This new class of inhibitors seems to be a promising chemotherapeutic agent against TB and merits further studies.
Induced Pluripotent Stem Cells: Problems and Advantages when Applying them in Regenerative Medicine
S. P. Medvedev1, A. I. Shevchenko1, S. M. Zakian1,2* 1Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences 2Research Center of Clinical and Experimental Medicine, Siberian Branch, Russian Academy of Medical Sciences
Received 10. 04. 2010
Induced pluripotent stem cells (iPSCs) are a new type of pluripotent cells that can be obtained by reprogramming animal and human differentiated cells. In this review, issues related to the nature of iPSCs are discussed and different methods of iPSC production are described. We particularly focused on methods of iPSC production without the genetic modification of the cell genome and with means for increasing the iPSC production efficiency. The possibility and issues related to the safety of iPSC use in cell replacement therapy of human diseases and a study
of new medicines are considered.
Bioglycans and Natural Glycosides As a Promising Research Topic in Bioorganic Chemistriy
Yu. S. Ovodov
Institute of Physiology, Komi Science Center, The Urals Branch, Russian Academy of Sciences
E-mail: firstname.lastname@example.org Received 18.03.2010
This review defines bioorganic chemistry as one of the most important constituents of physico-chemical biology, which is a fundamental life science. The problems and goals of bioorganic chemistry are examined through a comparatively small number of examples. Bioorganic chemistry is supposed to be a logical continuation of the chemistry of the natural substances that arose many years ago. Bioorganic chemistry has contributed some achievements in solving the problems of the chemical structure, biological function, and physiological activity of biopolymers and lowmolecular-weight bioregulators, as well as in the elucidation of the molecular mechanisms of different life processes. The most striking achievements in bioorganic chemistry are discussed in this paper. However, this review discusses not only the general achievements in this field of science, but also research data obtained by scientists from the Pacific Institute of Bioorganic Chemistry, Far East Branch, Russian Academy of Sciences (Vladivostok, Russia), and the Institute
of Physiology, Komi Science Centre, The Urals Branch, Russian Academy of Sciences (Syktyvkar, Russia). Particular attention is focused on comprehensive research into polysaccharides and biopolymers (bioglycans) and some natural glycosides that the author of this review has studied for a long time. The author has worked in these institutes for a long time and was honored by being chosen to head one of the scientific schools in the field of bioorganic chemistry and molecular immunology.
I.A. Mikhailopulo1*, A.I. Miroshnikov2 1Institute of Bioorganic Chemistry, National Academy of Sciences, Belarus 2Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences
This review focuses on new trends in nucleoside biotechnology, which have emerged during the last decade. Continuously growing interest in the study of this class of compounds is fueled by a number of factors: (i) a growing need for large-scale production of natural 2'deoxy-β-D-ribonucleosides as well as their analogs with modifications in the carbohydrate and base fragments, which can then be used for the synthesis and study of oligonucleotides, including short-interfering RNA (siRNA), microRNA (miRNA), etc.; (ii) a necessity for the development of efficient practical technologies for the production of biologically important analogs of natural nucleosides, including a number of anticancer and antiviral drugs; (iii) a need for further study of known and novel enzymatic transformations and their use as tools for the efficient synthesis of new nucloside analogs and derivates with biomedical potential. This article will review all of these aspects and also include a brief retrospect of this field of research.
B. S. Shenkman, O. V.Turtikova, T. L. Nemirovskaya, A. I. Grigoriev
Skeletal Muscle Activity and the Fate of Myonuclei
B. S. Shenkman*, O. V.Turtikova, T. L. Nemirovskaya, A. I. Grigoriev
Institute for Biomedical Problems, Russian Academy of Sciences
Adult skeletal muscle fiber is a symplast multinuclear structure developed in ontogenesis by the fusion of the myoblasts (muscle progenitor cells). The nuclei of a muscle fiber (myonuclei) are those located at the periphery of fiber in the space between myofibrils and sarcolemma. In theory, a mass change in skeletal muscle during exercise or unloading may be associated with the altered myonuclear number, ratio of the transcription, and translation and
proteolysis rates. Here we review the literature data related to the phenomenology and hypothetical mechanisms of the myonuclear number alterations during enhanced or reduced muscle contractile activity. In many cases (during severe muscle and systemic diseases and gravitational unloading), muscle atrophy is accompanied by a reduction in the amount of myonuclei. Such reduction is usually explained by the development of myonuclear apoptosis. A myonuclear number increase may be provided only by the satellite cell nuclei incorporation via cell fusion with the adjacent myofiber. It is believed that it is these cells which supply fiber with additional nuclei, providing postnatal growth, work hypertrophy, and repair processes. Here we discuss the possible mechanisms controlling satellite cell proliferation during exercise, functional unloading, and passive stretch.
I.G. Khaliullin, D.A. Suplatov, D.N. Shalaeva, M. Otsuka, Y. Asano, V.К. Švedas
Bioinformatic Analysis, Molecular Modeling of Role of Lys65 Residue in Catalytic Triad of D-aminopeptidase from Ochrobactrum anthropi
I.G. Khaliullin1,2, D.A. Suplatov1, D.N. Shalaeva1, M. Otsuka3, Y. Asano3, V.К. Švedas1* 1Faculty of Bioengineering and Bioinformatics, Lomonosov Moscow State University 2Department of Chemistry, Lomonosov Moscow State University 3Biotechnology Research Center, Toyama Prefectural University, Japan
A bioinformatic and phylogenetic study has been performed on a family of penicillin-binding proteins including D-aminopeptidases, D-amino acid amidases, DD-carboxypeptidases, and β-lactamases. Significant homology between D-aminopeptidase from Ochrobactrum anthropi and other members of the family has been shown and a number of conserved residues identified as S62, K65, Y153, N155, H287, and G289. Three of those (Ser62, Lys65, and Tyr153) form a catalytic triangle – the proton relay system that activates the generalized nucleophile in the course of catalysis. Molecular modeling has indicated the conserved residue Lys65 to have an unusually low pKa value, which has been confirmed experimentally by a study of the pH-profile of D-aminopeptidase catalytic activity. The resulting data have been used to elucidate the role of Lys65 in the catalytic mechanism of D-aminopeptidase as a general base for proton transfer from catalytic Ser62 to Tyr153, and vice versa, during the formation and hydrolysis of the acylenzyme intermediate.
D-aminopeptidase, penicillin-binding protein family, bioinformatic analysis, catalytic mechanism.
Development of Recombinant Vaccine against A(H1N1) 2009 Influenza Based on Virus-like Nanoparticles Carrying the Extracellular Domain of M2 Protein
R.Y. Kotlyarov1, V.V.Kuprianov1, A.I. Migunov2, L.A. Stepanova2, L.M. Tsybalova2, O.I. Kiselev2, N.V.Ravin1*, K.G. Skryabin1 1Centre “Bioengineering” Russian Academy of Sciences 2Research Institute of Influenza, Russian Academy of Medical Sciences
The conventional vaccines currently being used to deal with influenza are based on a virus obtained in chicken embryos or its components. The high variability of the major immunogenic surface proteins – hemagglutinin and neuraminidase–require the development of strain-specific vaccines that match the antigenic specificity of a newly emerging virus. Recombinant vaccines based on single viral proteins that could be easily produced in standard
expression systems are attractive alternatives to traditional influenza vaccines. We constructed recombinant nanosized virus-like particles based on a nuclear antigen of the hepatitis B virus. These particles expose on the surface the extracellular domain of the M2 protein of the highly pathogenic A(H1N1) 2009 influenza virus. The methods of production of these virus-like particles in Escherichia coli and their purification were developed. Experiments on animals show that M2sHBc particles are highly immunogenic in mice and provide complete protection against the lethal influenza challenge.
V. I. Tishkov, S. V. Uglanova, V. V. Fedorchuk, S. S. Savin
Influence of Ion Strength and pH on Thermal Stability of Yeast Formate Dehydrogenase
V. I. Tishkov1,2,3*, S. V. Uglanova1,4, V. V. Fedorchuk1, S. S. Savin2,3 1Department of Chemical Enzymology, Faculty of Chemistry, Lomonosov Moscow State University 2Innovations and High Technologies MSU Ltd. 3Bach Institute of Biochemistry, Russian Academy of Sciences 4Emanuel Institute of Biochemical Physics, Russian Academy of Sciences
The kinetics of the thermal inactivation of recombinant wild-type formate dehydrogenase from Candida boidinii yeast was studied in the temperature range of 53–61oC and pH 6.0, 7.0, and 8.0. It was shown that the loss of the enzyme’s activity proceeds via a monomolecular mechanism. Activation parameters ΔН ≠ and ΔS ≠ were calculated based on the temperature relations dependence of inactivation rate constants according to the transition state theory. Both parameters are in a range that corresponds to globular protein denaturation processes. Optimal conditions for the stability of the enzyme were high concentrations of the phosphate buffer or of the enzyme substrate sodium formate at pH = 7.0.
S. P. Medvedev, A. A. Malakhova, E. V. Grigor’eva, A. I. Shevchenko, E. V. Dementyeva, I. A. Sobolev,
I. N. Lebedev, A .G. Shilov, I. F. Zhimulev, S. M. Zakian
Derivation of Induced Pluripotent Stem Cells from Fetal Human Skin Fibroblasts
S. P. Medvedev1, A. A. Malakhova1, E. V. Grigor’eva1, A. I. Shevchenko1, E. V. Dementyeva1, I.A. Sobolev1, I. N. Lebedev2, A .G. Shilov1, I. F. Zhimulev3, S. M. Zakian1,4* 1Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences 2Research Institute of Medical Genetics, Siberian Branch, Russian Academy of Medical Sciences 3Institute of Chemical Biology and Fundamental Medicine, Siberian Branch, Russian Academy of Sciences 4Research Center of Clinical and Experimental Medicine, Siberian Branch, Russian Academy of Medical Sciences
* E-mail: email@example.com
The isolation and study of autologous human stem cells remain among the most urgent problems in cell biology and biomedicine to date. Induced pluripotent stem cells can be derived from human somatic cells by the overexpression of a number of genes. In this study we reprogrammed fetal human skin fibroblasts by transduction with retroviral vectors carrying murine Oct4, Sox2, Klf4, and c-Myc cDNAs. As a result, cells with the protein expression and gene transcription pattern characteristic of human embryonic stem cells were derived. These induced pluripotent cells are capable of differentiation in vitro into the ectoderm, mesoderm, and endoderm derivatives.
Effects of Myosin “Essential” Light Chain A1 on the Aggregation Properties of the Myosin Head
D. I. Markov1, O. P. Nikolaeva2, D. I. Levitsky1,2* 1Bach Institute of Biochemistry, Russian Academy of Sciences 2Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University
We compared the thermal aggregation properties of two isoforms of the isolated myosin head (myosin subfragment 1, S1) containing different “essential” (or “alkali”) light chains, A1 or A2. Temperature dependencies for the aggregation of these two S1 isoforms, as measured by the increase in turbidity, were compared with the temperature dependencies of their thermal denaturation obtained from differential scanning calorimetry (DSC) experiments. At relatively high ionic strength (in the presence of 100 mM KCl) close to its physiological values in muscle fibers, we
have found no appreciable difference between the two S1 isoforms in their thermally induced aggregation. Under these conditions, the aggregation of both S1 isoforms was independent of the protein concentration and resulted from their irreversible denaturation, which led to the cohesion of denatured S1 molecules. In contrast, a significant difference between these S1 isoforms was revealed in their aggregation measured at low ionic strength. Under these conditions, the aggregation of S1 containing a light chain A1 (but not A2) was strongly dependent on protein concentration, the increase of which (from 0.125 to 2.0 mg/ml) shifted the aggregation curve by ~10 degrees towards the lower temperatures. It has been concluded that the aggregation properties of this S1 isoform at low ionic strength is basically determined by intermolecular interactions of the N-terminal extension of the A1 light chain (which is absent in the A2 light chain) with other S1 molecules. These interactions seem to be independent of the S1 thermal denaturation, and they may take place even at low temperature.
Anionic Lipids: Determinants of Binding Cytotoxins from Snake Venom on the Surface of Cell Membranes
A.G. Konshina1*, I.A. Boldyrev1, A.V. Omelkov2, Yu.N. Utkin1, R.G. Efremov1 1Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences 2Faculty of Technology of Organic Substances and Chemical Pharmaceutical Compounds, Mendeleev University of Chemical Technology of Russia
The cytotoxic properties of cytotoxins (CTs) from snake venom are mediated by their interaction with the cell membrane. The hydrophobic pattern containing the tips of loops I–III and flanked by polar residues is known to be a membrane-binding motif of CTs. However, this is not enough to explain the difference in activity among various CTs which are similar in sequence and in 3D structure. The mechanism of further CT–membrane interaction leading to pore formation and cell death still remains unknown. Published experimental data on the specific interaction between
CT and low molecular weight anionic components (sulphatide) of the bilayer point to the existence of corresponding ligand binding sites on the surface of toxin molecules. In this work we study the membrane-lytic properties of CT I, CT II (Naja oxiana), and CT 4 (Naja kaouthia), which belong to different structural and functional types (P- and S-type) of CTs, by measuring the intensity of a fluorescent dye, calcein released from liposomes containing a phosphatidylserine (PS) lipid as an anionic component. Using molecular docking simulations, we find and characterize three sites in CT molecules that can potentially bind the PS polar head. Based on the data obtained, we suggest a hypothesis that CTs can specifically interact with one or more of the anionic lipids (in particular, with PS) contained in the membrane, thus facilitating the interaction between CTs and the lipid bilayer of a cell membrane.
2D-gel Electrophoresis As a Tool to Investigate the Composition of CD95 DISC
D. Riess, I. Lavrik*
Division of Immunogenetics, German Cancer Center, Heidelberg, Germany
Stimulation of CD95 (APO-1/Fas) leads to apoptosis induction in multicellular organisms. CD95-mediated apoptosis starts with the formation of the protein complex at the receptor CD95 (APO-1/Fas), which was named DISC (death-inducing signaling complex). In this work, the composition of the CD95 DISC in two different cell types was analyzed using proteomics approaches. Using 2D gels, the composition of the CD95 DISC was analyzed in the so-called
Type I and Type II cells, which are characterized by different kinetics of apoptosis. The detailed analysis of the CD95 DISC performed by 2D gels demonstrated that, besides the well-established components of the CD95 DISC, which are present in both cell types (CD95, FADD and procaspase-8), there are a number of differential spots detected at the CD95 DISC of Type I versus Type II cells. Taken together, this work demonstrates the differential composition of the CD95 DISC of Type I versus Type II cells.
Genomes, Populations and Diseases: Ethnic Genomics and Personalized Medicine
V. A. Stepanov
Research Institute for Medical Genetics, Siberian Branch, Russian Academy of Medical Sciences
This review discusses the progress of ethnic genetics, the genetics of common diseases, and the concepts of personalized medicine. We show the relationship between the structure of genetic diversity in human populations and the varying frequencies of Mendelian and multifactor diseases. We also examine the population basis of pharmacogenetics and evaluate the effectiveness of pharmacotherapy, along with a review of new achievements and prospects in personalized genomics.
ADD – autosomal dominant diseases, ARD – autosomal recessive diseases, HVSI – hypervariable segment I, mtDNA – mitochondrial DNA, CD – common diseases, RFLP – restriction fragments length polymorphism, IHD – ischemic heart disease, COLD – chronic obstructive lung disease, SNP – single nucleotide polymorphism, CNV – copy number variation, STR – short tandem repeats, HapMap – Haplotype Map of the Human Genome, CEU – population of Central European origin, YRI – population of Yoruba from Ibadan, Nigeria, CHB – Chinese population from Beijing, JPT – Japanese population from Tokyo, CMT1 – Charcot-Marie-Tooth disease, type 1, GWAS – genome-wide associations search, OR – odds ratio, OMIM – on-line Mendelian Inheritance in Man catalogue.
The Role of p66shc in Oxidative Stress and Apoptosis
E. R. Galimov
Belozersky Institute of Physico-Chemical Biology, Moscow State University
p66shc is a gene that regulates the level of reactive oxygen species (ROS), apoptosis induction, and lifespan in mammals. Mice knocked out for p66shc have a lifespan ~30% longer and demonstrate an enhanced resistance to oxidative stress and age-related pathologies such as hypercholesterolemia, ischemia, and hyperglycemia. In this respect, p66shc is a promising pharmacological target for the treatment of age-related diseases. In this review, an attempt has been made to survey and put to a critical analysis data concerning the involvement of p66shс in the different signaling pathways that regulate oxidative stress and apoptosis.
L.E. Salnikova, N.I. Zelinskaya, O. B. Belopolskaya, M.M. Aslanyan, A. V. Rubanovich
Association Study of Xenobiotic Detoxication and Repair Genes with Malignant Brain Tumors in Children
L. E. Salnikova1, N. I. Zelinskaya2, O. B. Belopolskaya1, M. M. Aslanyan3, A. V. Rubanovich1 1Vavilov Institute of General Genetics, Russian Academy of Sciences 2Federal State Center “Russian Scientific Center of Roentgenoradiology” 3Lomonosov Moscow State University
This study presents the results of research on DNA polymorphism in children with malignant brain tumors (172 patients, 183 in the control group). Genotyping was performed using an allele-specific tetraprimer reaction for the genes of the first (CYP1A1 (2 sites)) and second phases of xenobiotic detoxication (GSTM1,GSTT1, GSTP1, GSTM3), DNA repair genes XRCC1, XPD (2 sites), OGG1, as well as NOS1 and MTHFR. The increased risk of disease is associated with a minor variant of CYP1A1 (606G) (p = 0.009; OR = 1.50) and a deletion variant of GSTT1, (p = 0.013, OR = 1.96). Maximum disease risk was observed in carriers of double deletions in GSTT1-GSTM1 (p = 0.017, OR = 2.42). The obtained results are discussed in reference to literary data on the risk of malignant brain tumor formation in children and adults.
gene polymorphism, malignant brain tumors in children, genes of xenobiotic detoxication, DNA repair genes.
A.P. Sokolenko, A.G. Iyevleva, N.V. Mitiushkina, E.N. Suspitsin,
E.V. Preobrazhenskaya, E.Sh. Kuligina, D.A. Voskresenskiy, O.S. Lobeiko, N.Yu. Krylova, T.V. Gorodnova, K.G. Buslov, E.M. Bit-Sava, G.D. Dolmatov, N.V. Porhanova, I.S. Polyakov, S.N. Abysheva, A.S. Katanugina, D.V. Baholdin, G.A. Yanus, A.V. Togo, V.M. Moiseyenko, S.Ya. Maximov, V. F. Semiglazov, E. N. Imyanitov
Hereditary Breast-Ovarian Cancer Syndrome in Russia
A. P. Sokolenko1,2, A. G. Iyevleva1,2, N. V. Mitiushkina1, E. N. Suspitsin1,2, E.V. Preobrazhenskaya1, E.Sh. Kuligina1, D. A. Voskresenskiy2, O. S. Lobeiko2, N. Yu. Krylova1, T. V. Gorodnova1, K. G. Buslov2, E. M. Bit-Sava1, G. D. Dolmatov4, N. V. Porhanova5, I. S. Polyakov5, S. N. Abysheva1, A. S. Katanugina1, D. V. Baholdin1, G. A. Yanus1,2, A. V. Togo1, V. M. Moiseyenko1,3, S. Ya. Maximov1, V.F. Semiglazov1, E. N. Imyanitov1,2,3* 1Petrov Institute of Oncology, St. Petersburg 2State Pediatric Medical Academy, St. Petersburg 3Medical Academy for Postgraduate Studies, St. Petersburg 4City Oncological Hospital, St. Petersburg 5Kuban State Medical University, Krasnodar
Hereditary breast-ovarian cancer syndrome contributes to as much as 5–7% of breast cancer (BC) and 10–15% of ovarian cancer (OC) incidence. Mutations in the “canonical” genes BRCA1 and BRCA2 occur in 20–30% of affected pedigrees. In addition to BRCA1 and BRCA2 mutations, germ-line lesions in the CHEK2, NBS1, and PALB2 genes also contribute to familial BC clustering. The epidemiology of hereditary breast-ovarian cancer in Russia has some specific features. The impact of the “founder” effect is surprisingly remarkable: a single mutation, BRCA1 5382insC, accounts for the vast majority of BRCA1 defects across the country. In addition, there are two other recurrent BRCA1 alleles: BRCA1 4153delA and BRCA1 185delAG. Besides BRCA1, in Russia breast cancer is often caused by germ-line alterations in the CHEK2 and NBS1 genes. In contrast to BRCA1 and BRCA2, the CHEK2 and NBS1 heterozygosity does not significantly increase the OC risk. Several Russian breast cancer clinics recently started to investigate the efficacy of cisplatin in the therapy of BRCA1-related cancers; initial results show a unique sensitivity of BRCA1-associated tumours to this compound.
breast cancer, ovarian cancer, hereditary cancer syndromes, BRCA1, CHEK2, NBS.
Dosage Compensation of Sex Chromosome Genes in Eukaryotes
E. V. Dementyeva1,2, S. M. Zakian1,2,3* 1Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences 2Institute of Chemical Biology and Fundamental Medicine, Siberian Branch, Russian Academy of Sciences 3Research Center of Clinical and Experimental Medicine, Siberian Branch, Russian Academy of Medical Sciences
*E-mail: firstname.lastname@example.org Received 24.09.2010
Sex chromosome evolution is accompanied by significant divergence in morphology and gene content and results in most genes of one of the sex chromosomes being present in two dosages in one sex and in one dosage in the other. To eliminate the difference in the expression levels of these genes between sexes and to restore equal expression levels of the genes between sex chromosomes and autosomes, mechanisms of dosage compensation have appeared. Studies of three classical objects, Drosophila melanogaster, Caenorhabditis elegans, and mammals, have shown that dosage compensation of X-linked genes can be achieved through completely different chromosome-wide mechanisms. New data on sex chromosome gene expression demonstrating that many sex chromosome genes can be expressed at different levels in males and females were recently obtained from birds and butterflies. In this review, dosage compensation mechanisms in D. melanogaster, C. elegans, and mammals are considered and the data on sex chromosome gene expression in birds and butterflies, and their influence on our view of dosage compensation, are discussed.
dosage compensation, sex chromosomes, gene expression, X-chromosome inactivation
Classification of G-Quadruplex DNA on the Basis of the Quadruplex Twist Angle and Planarity of G-Quartets
R. V. Reshetnikov1,4, A. M. Kopylov2,3,4, A. V. Golovin1,4* 1Faculty of Bioengineering and Bioinformatics, Lomonosov Moscow State University 2Faculty of Chemistry, Lomonosov Moscow State University 3Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University 4Apto-Pharm LLC
The present work is devoted to the analysis of the G-quadruplex DNA structure using the bioinformatics method. The interest towards quadruplex DNAs is determined by their involvement in the functioning of telomeres and onco-promoters as well as by the possibility to create on their basis aptamers and nanostructures. Here, we present an algorithm for a general analysis of the polymorphism of the G-quadruplex structure from the data bank PDB using original parameters. 74 structures were grouped according to the following parameters: the number of DNA strands, the number of G-quartets, and the location and orientation of the connecting
loops. Two quantitative parameters were used to describe the quadruplex structure: the twist angle between two adjacent quartets (analogous to that for the complementary pair in the duplex DNA) and the quartet planarity (an original parameter). The distribution patterns of these values are specific for each group of quadruplex structures and are dependent upon the type of connecting loops used (diagonal, lateral or propeller). The tetramolecular loopless parallel quadruplex was used as a comparison template. The lateral loops introduce the strongest
distortion into the structure of quadruplexes: the values of the twist angles are the lowest and are not typical for the other quadruplex groups. The loops of the diagonal type introduce much weaker deformation into quadruplexes; the structures with propeller loops are characterized by the optimum geometry of G-quartets. Hence, the correlation between the twist angle and the tension in the structure of quadruplex DNA is revealed.
Biopharmacology of Enzyme Conjugates: Vasoprotective Activity of Supramolecular Superoxide Dismutase-Chondroitin Sulfate-Catalase Derivative
A.V. Maksimenko*, A.V. Vavaev, L.I. Bouryachkovskaya, V.P. Mokh, I.A. Uchitel, V.L. Lakomkin, V.I. Kapelko, E.G. Tischenko
Institute of Experimental Cardiology, Russian Cardiology Research-and-Production Complex
* E-mail: email@example.com
Bienzyme conjugate was obtained by the covalent connection of superoxide dismutase with catalase through endothelial glycocalyx glycosaminoglycan – chondroitin sulfate (SOD-CHS-CAT). This SOD-CHS-CAT conjugate has vasoprotective activity in respect to platelet interactions, tonus of the ring arterial fragment of a rat blood vessel, as well as normalization of hemodynamic parameters in rats and rabbits in conditions of oxidative stress caused by the administration of hydrogen peroxide. The SOD-CHS-CAT conjugate had antiplatelet potential due to its antiaggregation action manifested through the combination of enzyme activities and an
acquired supramolecular structure. The influence on arterial fragment tonus was equivalent for SOD and CAT in native and conjugated form. Blood pressure and heart rate were significant and effectively normalized with SOD-CHS-CAT conjugate in rats and rabbits (after hydrogen peroxide administration as a perturbance stimulus). We have discovered the possibility of using the antioxidant bienzyme conjugate in chronic prophylaxis. It is important for a real development of the oral form of the SOD-CHS-CAT conjugate. These results indicate that the development of enzyme conjugates can be medically significant, as a promising approach for the creation of
A. N. Glushkov, S. V. Apalko, M. L. Filipenko, V. A. Matveeva, A. Yu. Bakulina, V. G. Lunin, M. V. Kostyanko
A Novel Approach to the Development of Anticarcinogenic Vaccines
A. N. Glushkov1, S. V. Apalko1*, M. L. Filipenko1,2, V. A. Matveeva1,2, A. Yu. Bakulina1, V. G. Lunin3, M. V. Kostyanko1,4 1Institute of Human Ecology, Siberian Branch, Russian Academy of Sciences 2Institute of Chemical Biology and Fundamental Medicine, Siberian Branch, Russian Academy of Sciences 3Gamaleya Research Institute of Epidemiology and Microbiology 4Kemerovo State University
Received 07. 10. 2011
Human exposure to chemical carcinogens is an important etiological factor in cancer diseases. In this article, we will discuss a new approach to the development of anticarcinogenic vaccines. The main task in our research was to select a benzo[a]pyrene immunomimetic peptide considered as a hapten-specific component. For this purpose, we synthesized carcinogen-protein conjugates and prepared mono- and polyclonal antibodies to benzo[a]pyrene. Phage display technology was used to select the benzo[a]pyrene immunomimetic peptide, followed by an evaluation of the immunological properties of the obtained peptide. The obtained benzo[a]pyrene
immunomimetic peptide could only simulate chemical carcinogens in the frame of the pIII protein. As a result, we prepared a recombinant protein composed of the benzo[a]pyrene immunomimetic peptide and pIII-encoding sequences. Using ELISA, we demonstrated that the recombinant protein specifically interacts with the antibenzo[a]pyrene monoclonal antibody (mAB B2). Using molecular modeling, we predicted the 3-D structure of the mAB B2 active center and analyzed the characteristics of its interaction with different polycyclic aromatic hydrocarbons, as well as with the benzo[a]pyrene immunomimetic peptide. Thus, a comprehensive analysis of the results of the obtainment of hapten-specific components of anticarcinogenic vaccines allowed us to outline
a strategy for future development in this direction.
M. V. Zagoskin, T. L. Marshak, D. V. Mukha, A. K. Grishanin
Chromatin Diminution Process Regulates rRNA Gene Copy Number in Freshwater Copepods
M. V. Zagoskin1*, T. L. Marshak2, D. V. Mukha1, A. K. Grishanin1 1Vavilov Institute of General Genetics, Russian Academy of Sciences 2Koltsov Institute of Developmental Biology, Russian Academy of Sciences
The results of quantitative PCR (qPCR) presented in the paper clearly demonstrate that the sixteenfold genome reduction in Cyclops kolensis during chromatin diminution (from 15.3 pg to 0.98 pg) results in a dramatic decrease in ribosomal RNA gene copy numbers in the genome of a somatic cell line by more than two orders of magnitude. The results presented allow for the consideration of the chromatin diminution as a mechanism of rDNA copy number regulation.
Modeling of the Full-Size 3D Structure of Human Chaperone Hsp70 and Study of Its Interdomain Interactions
К. А. Chernorizov1, V.K.Svedas1,2*,2* 1Faculty of Bioengineering and Bioinformatics, Lomonosov Moscow State University 2Belozersky Institute of Physicochemical Biology, Lomonosov Moscow State University
Hsp70 is a chaperone protein that participates in the folding of de novo synthesized proteins, protection of the hydrophobic regions of denaturated proteins, the regulation of apoptosis, the immune response, and several other cellular processes. Despite the large number of publications devoted to the functioning and structure of Hsp70, a reliable full-size 3D structure of this protein remains currently unavailable. Several probable full-size models of human Hsp70 have been constructed based on the structures of individual domains and their components from different organisms and using molecular modeling methodology. The stability of the obtained structures was studied using molecular dynamics. As a result of such an analysis, the most adequate model was selected. The model was built on the basis of Hsp70 elements from Bos Taurus and Caenorhabditis elegans. Using the method of steered molecular dynamics, the key salt bridges responsible for the interdomain interactions were identified: Arg171: Glu516 and Arg416: Glu218. Based on the performed molecular modeling, the scheme of the mechanism triggering ATP hydrolysis and leading to the separation of ATPase and the substrate-binding domains was proposed.
S.S. Shishkin, L.I. Kovalyov, M.A. Kovalyova, K.V. Lisitskaya, L.S. Eremina, A.V. Ivanov, E.V. Gerasimov, E.G. Sadykhov, N.Y. Ulasova, O.S. Sokolova, I.Y. Toropygin, V.O. Popov
“Prostate Cancer Proteomics” Database
S. S. Shishkin1*, L. I. Kovalyov1, M. A. Kovalyova1, K. V. Lisitskaya1, L. S. Eremina1, A. V. Ivanov1, E. V. Gerasimov1, E. G. Sadykhov1, N. Y. Ulasova2, O. S. Sokolova2, I. Y. Toropygin3, V. O. Popov1 1Bach Institute of Biochemistry, Russian Academy of Sciences 2Lomonosov Moscow State University 3Orekhovich Institute of Biomedical Chemistry, Russian Academy of Medical Sciences
A database of Prostate Cancer Proteomics has been created by using the results of a proteomic study of human prostate carcinoma and benign hyperplasia tissues, and of some human-cultured cell lines (PCP, http://ef.inbi.ras.ru). PCP consists of 7 interrelated modules, each containing four levels of proteomic and biomedical data on the proteins in corresponding tissues or cells. The first data level, onto which each module is based, is a 2DE proteomic reference map where proteins separated by 2D electrophoresis, and subsequently identified by mass-spectrometry, are marked. The results of proteomic experiments form the second data level.
The third level contains protein data from published articles and existing databases. The fourth level is formed with direct Internet links to the information on corresponding proteins in the NCBI and UniProt databases. PCP contains data on 359 proteins in total, including 17 potential biomarkers of prostate cancer, particularly AGR2, annexins, S100 proteins, PRO2675, and RO2044. The database will be useful in a wide range of applications, including studies of molecular mechanisms of the aetiology and pathogenesis of prostate diseases, finding new diagnostic markers, etc.
proteomics, prostate cancer, digital database
2DE—two-dimensional gel electrophoresis, BPH—benign prostate hyperplasia, PCa—prostate cancer, PCP—prostate cancer proteomics
A In Vitro and In Vivo Study of the Ability of NOD1 Ligands to Activate the Transcriptional Factor NF-kB
A.I. Tukhvatulin1*, D.Y. Logunov1, I.I. Gitlin2, M.M. Shmarov1, P.V. Kudan1, А.А. Adzhieva1, A.F. Moroz1, N.N. Kostyukova1, L.G. Burdelya2, B.S.Naroditsky1, A.L.Gintsburg1, A.V.Gudkov2 1Gamaleya Research Institute of Epidemiology and Microbiology, Russian Academy of Medical Sciences 2Roswell Park Cancer Institute, Elm & Carlton Streets, Buffalo, New York, USA
Pattern-recognition receptors (PRR) play a crucial role in the induction of the defense reactions of the immune system against pathogenic bacterial and viral infections. The activation of PRR by specific, highly conserved pathogen-associated molecular patterns (PAMPs) induces numerous immune reactions related both to innate and adaptive immunity. In addition to the well-studied Toll-like receptors, pathogens can be recognized by the receptors belonging to the other PRR families; including NOD-like receptors (NLR). Stimulation of members of NOD-like receptors (NOD1, 2) and Toll-like receptors results in the activation of the transcriptional factor NF-kB regulating gene expression in numerous molecules implicated in the development of proinflammatory reactions. As opposed to Toll-like receptors, the NF-kB-activating ability of NLRs has not been fully studied. In this work, we examine the ability of one member of the NLR family – NOD1 – to activate the main proinflammatory transcriptional factor NF-kB. We also compare the NF-kB-activating ability of NOD1 ligands of a different structure with TLR4,5 ligands in vitro and in vivo.
Family Analysis of Linkage and Association of HLA-DrB1, CTLa4, TGFB1, IL4, CCr5, ranTES, MMP9 and TIMP1 Gene Polymorphisms with Multiple Sclerosis
O.Yu. Makarycheva1, E.Yu. Tsareva1,2, M.A. Sudomoina1,2, O.G. Kulakova1,2, B.V. Titov1,2, O.V. Bykova3, N.V. Gol’tsova3, L.M. Kuzenkova3, A.N. Boiko2, O.O. Favorova1,2* 1Russian Cardiology Scientific and Production Center 2Russian State Medical University 3Scientific Center of Children Health, Russian Academy of Medical Sciences
Multiple sclerosis (MS) is a chronic inflammatory autoimmune disease of the central nervous system (CNS). Proteins of the immune system, as well as proteins that are involved in the infiltration of activated immune cells in the CNS, play an important role in the pathogenesis of MS. We investigated the association and linkage with MS of the following immune-system genes polymorphisms: HLA-DRB1, CTLA4, TGFB1, IL4, CCR5 and RANTES, as well as of the matrix metalloproteinase 9 (MMP9) and tissue inhibitor of metalloproteinase 1 (TIMP1) genes polymorphisms. For this purpose we used the transmission disequilibrium test (TDT). The group investigated was comprised of 100 nuclear families of Russian ethnicity, each consisting of an affected offspring and his nonaffected parents. It was found that HLA-DRB1*15 allele and MMP9*-1562C allele were transmitted from healthy heterozygous parents to affected children more frequently than alternative alleles (p = 0.02 and p = 0.04, respectively). Another family-based method, AFBAC (affected family-based control), showed MS association with HLA-DRB1*15, but not with the MMP9*-1562C allele.
MS – multiple sclerosis; PCR – polymerase chain reaction; CNS – central nervous system; AFBAC (affected family-based control) – the method of family analysis, in which the control group consists of the alleles, that were not transmitted from parents to affected children; CCR5 (CCR5) – CC chemokine receptor 5 (its gene); CTLA4 (CTLA4) – cytotoxic T lymphocyte antigen-4 (its gene); HLA-DRB (HLA-DRB1) – ? chain of human HLA-DR antigen (its gene 1); IL-4 (IL4) – interleukin-4 (its gene); MMP (MMP) – matrix metalloproteinase (its gene); RANTES (RANTES) – chemokine regulated on activation, normal T cell expressed and secreted (its gene); SNP – single-nucleotide polymorphism; TDT – transmission disequilibrium test; TGFβ1 (TGFB1) – transforming growth factor ?1 (its gene); TIMP (TIMP) – tissue inhibitor of matrix metalloproteinases (its gene).
Comparative Bioinformatic Analysis of Active Site Structures in Evolutionarily Remote Homologues of α,β-Hydrolase Superfamily Enzymes
D. A. Suplatov1,2, V. K. Arzhanik1,V. K. Svedas1,2* 1Faculty of Bioengineering and Bioinformatics, Lomonosov Moscow State University 2Belozersky Institute of Physicochemical Biology, Lomonosov Moscow State University
Comparative bioinformatic analysis is the cornerstone of the study of enzymes’ structure-function relationship. However, numerous enzymes that derive from a common ancestor and have undergone substantial functional alterations during natural selection appear not to have a sequence similarity acceptable for a statistically reliable comparative analysis. At the same time, their active site structures, in general, can be conserved, while other parts may largely differ. Therefore, it sounds both plausible and appealing to implement a comparative analysis of the most functionally important structural elements – the active site structures; that is, the amino acid residues involved in substrate binding and the catalytic mechanism. A computer algorithm has been developed to create a library of enzyme active site structures based on the use of the PDB database, together with programs of structural analysis and identification of functionally important amino acid residues and cavities in the enzyme structure. The proposed methodology has been used to compare some α,β-hydrolase superfamily enzymes. The insight has revealed a high structural similarity of catalytic site areas, including the conservative organization of a catalytic triad and oxyanion hole residues, despite the wide functional diversity among the remote homologues compared. The methodology can be used to compare the structural organization of the catalytic and substrate binding sites of various classes of enzymes, as well as study enzymes’ evolution and to create of a databank of enzyme active site structures.
bioinformatics, comparative analysis, active site, structural alignment, α,β-hydrolases
PDB - Protein Data Bank; CSA - Catalytic Site Atlas
Multi-walled Сarbon Nanotubes Penetrate into Plant Cells and Affect the Growth of Onobrychis arenaria Seedlings
E.A. Smirnova1*, A.A. Gusev2, O.N. Zaitseva2, E.M. Lazareva1, G.E. Onishchenko1, E.V. Kuznetsova3, A.G. Tkachev4, A.V. Feofanov1,5, M.P. Kirpichnikov1,5 1Biology Faculty, Lomonosov Moscow State University
2Derzhavin Tambov State University
3Siberian Institute of Plant Physiology and Biochemistry, Siberian Branch, Russian Academy of Sciences
5Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences
Engineered nanoparticles (ENPs) are now being used in many sectors of industry; however, the impact of ENPs on the environment still requires further study, since their use, recycling, and accidental spill can result in the accumulation of nanoparticles in the atmosphere, soil, and water. Plants are an integral part of ecosystems; hence their interaction with ENPs is inevitable. It is important to understand the consequences of this interaction and assess its potential effects. The present research is focused on studying the effects of the industrial material Taunit, containing multi-walled carbon nanotubes (MWNTs), on plants, and testing of its ability to penetrate into plant cells and tissues. Taunit has been found to stimulate the growth of roots and stems and cause an increase in peroxidase activity in Onobrychis arenaria seedlings. Peroxidase activity increases with decreasing concentration of Taunit from 1,000 to 100 mg/l. MWNTs from Taunit were detected in the cells and tissues of seedling roots and leaves, implying the ability of MWNTs to penetrate into roots and accumulate there, as well as their ability to be transported into seedling leaves. Thus, the changes in the physiological parameters of plants are associated not only with MWNT adsorption on the root surface, as previously believed, but also with their penetration, uptake and accumulation in the plant cells and tissues.
multi-walled carbon nanotubes, light microscopy, electron microscopy, electron diffraction pattern, O. arenaria seedlings.
CNM – carbon nanomaterials; MWNT – multi-walled carbon nanotubes; SWNT – single-walled carbon nanotubes; TEM – transmission electron microscopy, SAED – selected area electron diffraction.
Modeling Myocardial Infarction in Mice: Methodology, Monitoring, Pathomorphology
A.A. Ovsepyan4, D.N. Panchenkov1,3, E.B. Prokhortchouk1*, G.B. Telegin4, N.A. Zhigalova1, E.P. Golubev2, T. E. Sviridova5, S.T. Matskeplishvili2, K.G. Skryabin1, U.I. Buziashvili1,2 1Center “Bioengineering”, Russian Academy of Sciences 2Bakoulev Center for Cardiovascular Surgery, Russian Academy of Medical Sciences 3Moscow State University of Medicine and Dentistry 4The Branch of the Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Pushchino, Russian Academy of Sciences 5Semashko Railway Hospital
Myocardial infarction is one of the most serious and widespread diseases in the world. In this work, a minimally invasive method for simulating myocardial infarction in mice is described in the Russian Federation for the very first time; the procedure is carried out by ligation of the coronary heart artery or by controlled electrocoagulation. As a part of the methodology, a series of anesthetic, microsurgical and revival protocols are designed, owing to which a decrease in the postoperational mortality from the initial 94.6 to 13.6% is achieved. ECG confirms the development of large-focal or surface myocardial infarction. Postmortal histological examination confirms the presence of necrosis foci in the heart muscles of 87.5% of animals. Altogether, the medical data allow us to conclude that an adequate mouse model for myocardial infarction was generated. A further study is focused on the standardization of the experimental procedure and the use of genetically modified mouse strains, with the purpose of finding the most efficient therapeutic approaches for this disease.
Molecular and Physiological Mechanisms of Membrane Receptor Systems Functioning
E. S. Severin1*, M. V. Savvateeva2 1All-RussiaResearch Center for Molecular Diagnostics and Therapy 2Biology Faculty, Lomonosov Moscow State University
Molecular physiology is a new interdisciplinary field of knowledge that looks into how complicated biological systems function. The living cell is a relatively simple, but at the same time very sophisticated biological system. After the sequencing of the human genome, molecular physiology has endeavored to investigate the systems of cellular interactions at a completely new level based on knowledge of the spatial organization and functions of receptors, their ligands, and protein-protein interactions. In recent years, the achievements in molecular physiology have centered on the study of sensor reception mechanisms and intercellular data transfer, as well as the immune system physiology, amongst other processes.
A. V. Safonova, A.N. Petrin, S. D. Arutyunov, V. N. Tsarev, L. A. Akulenko, A.O. Zorina, D. V. Rebrikov, A. V. Rubanovich, S. A. Borinskaya, N. K. Yankovsky
Association of Cytokine Gene Alleles with the Inflammation of Human Periodontal Tissue
A. V. Safonova1*, A.N. Petrin1, S. D. Arutyunov1, V. N. Tsarev1, L. A. Akulenko1, A. O. Zorina2, D. V. Rebrikov3,4, A. V. Rubanovich3,4, S. A. Borinskaya1,4, N. K. Yankovsky4 1Moscow State University of Medicine and Dentistry 2Central Research Institute of Dentistry and Oral Surgery, Federal Agency of Medical Technologies 3DNA-Technology JSC. 4Vavliov Institute of General Genetics, Russian Academy of Sciences
Gingivitis and periodontitis are chronic inflammatory diseases of the periodontal tissue in humans caused by both environmental and genetic factors. The human cytokine genes that regulate the immune response may play an important role in the development of these chronic inflammatory diseases. The aim of this study is to analyze the allele status of eight human cytokine genes and to associate it with the inflammation of periodontal tissue in humans. A total of 296 unrelated males of Russian origin were studied. A significant association of the IL1B and IL6 minor alleles and gingivitis was found. In addition, we found a significant association of the OHI-S index with the IL18 gene alleles. The influence of genetic factors on gingivitis may contribute to the understanding of the mechanisms of interaction between genetic and environmental factors in periodontal conditions, and to the identification of risk groups for effective prevention and treatment.
T. A. Zdobnova*, E. N. Lebedenko, S.М. Deyev
Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences
Semiconductor quantum dots (QDs) are a new class of fluorophores with unique physical and chemical properties, which allow to appreciably expand the possibilities for the current methods of fluorescent imaging and optical diagnostics. Here we discuss the prospects of QD application for molecular diagnostics of tumors ranging from cancer-specific marker detection on microplates to non-invasive tumor imaging in vivo. We also point out the essential problems that require resolution in order to clinically promote QD, and we indicate innovative approaches to oncology which are implementable using QD.
D. A. Skvortsov, M. E. Zvereva, O.V. Shpanchenko, O. A. Dontsova
Assays for Detection of Telomerase Activity
D. A. Skvortsov, M. E. Zvereva, O.V. Shpanchenko, O. A. Dontsova
Faculty of Chemistry, Lomonosov Moscow State University
Progressive loss of the telomeric ends of chromosomes caused by the semi-conservative mechanism of DNA replication is an important timing mechanism which controls the number of cells doubling. Telomerase is an enzyme which elongates one chain of the telomeric DNA and compensates for its shortening during replication. Therefore, telomerase activity serves as a proliferation marker. Telomerase activity is not detected in most somatic cells, with the exception of embryonic tissues, stem cells, and reproductive organs. In most tumor cells (80–90%), telomerase is activated and plays the role of the main instrument that supports the telomere length, which can be used for the diagnostics of neoplastic transformation. This is the primary reason why assays regarding the development of telomerase activity have attracted the attention of researchers. Telomerase activity testing may be useful in the search for telomerase inhibitors, which have the potential to be anti-cancer drugs. Moreover, telomerase activation may play a positive role in tissue regeneration; e.g., after partial removal of the liver or cardiac infarction.
All telomerase activity detection assays can be divided into two large groups: those based on direct detection of telomerase products, and those based on different systems of amplification of the signals from DNA that yield from telomerase. The methods discussed in this review are suitable for testing telomerase activity in different samples: in protozoa and mammalian cells, mixed cellular populations, and tissues.
K. D. Nadezhdin, O. V. Bocharova, E. V. Bocharov, A. S. Arseniev
Structural and Dynamic Study of the Transmembrane Domain of the Amyloid Precursor Protein
K. D. Nadezhdin, O. V. Bocharova, E. V. Bocharov*, A. S. Arseniev
Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences
Alzheimer’s disease affects people all over the world, regardless of nationality, gender or social status. An adequate study of the disease requires essential understanding of the molecular fundamentals of the pathogenesis. The amyloid β-peptide, which forms amyloid plaques in the brain of people with Alzheimer’s disease, is the product of sequential cleavage of a single-span membrane amyloid precursor protein (APP). More than half of the APP mutations found to be associated with familial forms of Alzheimer’s disease are located in its transmembrane domain. The pathogenic mutations presumably affect the structural-dynamic properties of the APP transmembrane domain by changing its conformational stability and/or lateral dimerization. In the present study, the structure and dynamics of the recombinant peptide corresponding to the APP fragment, Gln686-Lys726, which comprises the APP transmembrane domain with an adjacent N-terminal juxtamembrane sequence, were determined in the membrane mimetic environment composed of detergent micelles using NMR spectroscopy. The structure obtained in dodecylphosphocholine micelles consists of two α-helices: a short surface-associated juxtamembrane helix (Lys687-Asp694) and a long transmembrane helix (Gly700-Leu723), both connected via a mobile loop region. A minor bend of the transmembrane α-helix is observed near the paired residues Gly708-Gly709. A cholesterol-binding hydrophobic cavity is apparently formed under the loop region, where the juxtamembrane α-helix comes into contact with the membrane surface near the N-terminus of the transmembrane α-helix.
Promoters with Cancer Cell-Specific Activity for Melanoma Gene Therapy
V.V. Pleshkan1,2*, I.V. Alekseenko1,2, M.V. Zinovyeva1, T.V. Vinogradova1, E.D. Sverdlov1,2 1Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences 2Institute of Molecular Genetics, Russian Academy of Sciences
Melanoma is one of the most aggressive tumors. It develops from pigment-forming cells (melanocytes) and results in a high number of lethal outcomes. The use of genetic constructs with the ability to specifically kill melanoma cells, but not normal cells, might increase the lifespan of patients, as well as improve their quality of life. One of the methods to achieve a selective impact for therapeutic genes on cancer cells is to utilize a transcriptional control mechanism using promoters that are specifically activated only in cancerous cells. In this review, promoters of the genes that are preferentially expressed in melanoma cells are described. These promoters, and other highly melanoma-specific regulatory elements, reduce the unspecific expression of therapeutic genes in normal tissues. Moreover, cancer-specific promoters and their elements are advantageous for the development of universal anticancer drugs. Examples of the use of double promoters that have a high potential as instruments in cancer gene therapy are also given in this review.
melanoma; gene therapy; tissue-specific promoters; specific expression of a transgene
Ad – adenovirus; CRAds – conditionally replicative adenoviruses; DT-A – diphtheria toxin A chain; HSVtk – herpes simplex virus thymidine kinase; SCLC – small cell lung cancer; MC1R – melanocortin 1 receptor; MIA – melanoma inhibitory activity, MITF – microphthalmia-associated transcription factor; TERT – human telomerase reverse transcriptase; TSP – tumor specific promoter; TSS – transcription start site
Gold Nanoparticles in Biology and Medicine: Recent Advances and Prospects
L. A. Dykman1, N. G. Khlebtsov1,2* 1Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences 2Saratov State University
Functionalized gold nanoparticles with controlled geometrical and optical properties are the subject of intensive studies and biomedical applications, including genomics, biosensorics, immunoassays, clinical chemistry, laser phototherapy of cancer cells and tumors, the targeted delivery of drugs, DNA and antigens, optical bioimaging and the monitoring of cells and tissues with the use of state-of-the-art detection systems. This work will provide an overview of the recent advances and current challenges facing the biomedical application of gold nanoparticles of various sizes, shapes, and structures. The review is focused on the application of gold nanoparticle conjugates in biomedical diagnostics and analytics, photothermal and photodynamic therapies, as a carrier for delivering target molecules, and on the immunological and toxicological properties. Keeping in mind the huge volume and high speed of the data update rate, 2/3 of our reference list (certainly restricted to 250 Refs.) includes publications encompassing the past 5 years.
gold nanoparticles; plasmon resonance; biosensors; biomedical diagnostics; photothermal and photodynamic therapy; targeted drug delivery; nanotoxicology
GNP – gold nanoparticles; PR – plasmon resonance; PPTT – plasmonic photothermal therapy; PEG – polyethylenglycol; SEM – scanning electron microscopy; TEM – transmission electron microscopy; PDT – photodynamic therapy; TNF – tumor necrosis factor; CTAB – cetyltrimethylammonium bromide; SPIA – sol particle immunoassay
V. A Stepanov, O. P. Balanovsky, A. V. Melnikov, A. Yu. Lash-Zavada, V. N. Khar’kov, T. V. Tyazhelova, V. L. Akhmetova, O. V. Zhukova,
Yu. V. Shneider, I. N. Shil’nikova, S. A. Borinskaya, A. V. Marusin,
M. G. Spiridonova, K. V. Simonova, I. Yu. Khitrinskaya, M. O. Radzhabov, A. G. Romanov, O. V. Shtygasheva, S. M. Koshel’, E. V. Balanovskaya, A. V. Rybakova, E. K. Khusnutdinova, V. P. Puzyrev, N. K. Yankovsky
Characteristics of Populations of the Russian Federation over the Panel of Fifteen Loci Used for DNA Identification and in Forensic Medical Examination
V. A Stepanov1,6*, O. P. Balanovsky2,5, A. V. Melnikov3, A. Yu. Lash-Zavada3, V. N. Khar’kov1,6, T. V. Tyazhelova2, V. L. Akhmetova4, O. V. Zhukova2, Yu. V. Shneider2, I. N. Shil’nikova2, S. A. Borinskaya2, A. V. Marusin1, M. G. Spiridonova1, K. V. Simonova1, I. Yu. Khitrinskaya1, M. O. Radzhabov7, A. G. Romanov5, O. V. Shtygasheva8, S. M. Koshel’9, E. V. Balanovskaya5, A. V. Rybakova3, E. K. Khusnutdinova4, V. P. Puzyrev1, N. K. Yankovsky1 1Institute for Medical Genetics, Russian Academy of Medical Sciences 2Vavilov Institute of General Genetics, Russian Academy of Sciences 3Forensic Centre, Ministry of Interior of Russian Federation 4Institute of Biochemistry and Genetics, Ufa Research Centre, Russian Academy of Sciences 5Research Centre for Medical Genetics, Russian Academy of Sciences 6Genome Diagnostics, Ltd. 7Dagestan State University 8Katanov Khakas State University 9Geography Faculty, Lomonosov Moscow State University
Seventeen population groups within the Russian Federation were characterized for the first time using a panel of 15 genetic markers that are used for DNA identification and in forensic medical examinations. The degree of polymorphism and population diversity of microsatellite loci within the Power Plex system (Promega) in Russian populations; the distribution of alleles and genotypes within the populations of six cities and 11 ethnic groups of the Russian Federation; the levels of intra- and interpopulation genetic differentiation of population; genetic relations between populations; and the identification and forensic medical characteristics of the system of markers under study were determined. Significant differences were revealed between the Russian populations and the U.S. reference base that was used recently in the forensic medical examination of the RF. A database of the allelic frequencies of 15 microsatellite loci that are used for DNA identification and forensic medical examination was created; the database has the potential of becoming the reference for performing forensic medical examinations in Russia. The spatial organization of genetic diversity over the panel of the STR markers that are used for DNA identification was revealed. It represents the general regularities of geographical clusterization of human populations over various types of genetic markers. The necessity to take into account a
population’s genetic structure during forensic medical examinations and DNA identification of criminal suspects was substantiated.
microsatellites; short tandem repeats; allelic frequencies; forensic medical examination; DNA identification; population of Russia; reference database; genetic diversity; gene geography
MI RF – Ministry of Interior of the Russian Federation; PCR – polymerase chain reaction; He – expected heterozygosity; AMOVA – Analysis of molecular variance; CODIS – combined DNA index system; EDNAP – the European DNA Profiling Group; ENFSI – European Network of Forensic Science Institutes; ESS – European Standard Set; MP – matching probability; PD – power of discrimination; PE – power of exclusion; PI – paternity index; SNP – single nucleotide polymorphism; STR – short tandem repeats; UPGMA – unweighted pair group method with arithmetic mean
O. V. Samsonova, K. S. Kudryashova, A. V. Feofanov
N-Terminal Moiety of Antimicrobial Peptide Ltc1-K Increases its Toxicity for Eukaryotic Cells
O. V. Samsonova1,2, K. S. Kudryashova1, A. V. Feofanov1,2* 1Biological Faculty, Lomonosov Moscow State University 2Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences
The antimicrobial peptide Ltc1-K and its derivates without one, two, then three N-terminal amino acid residues were studied based on the hypothesis (backed by some experimental data) that the hydrophobic N-terminal moiety of linear cationic antimicrobial peptides defines their haemolytic activity. It was discovered that the excision of three N-terminal amino acid residues considerably decreases the peptide’s toxicity for eukaryotic cells and simultaneously increases the selectivity of antibacterial activity for some bacteria species. Studies performed with the model membrane systems and human erythrocytes revealed that the main reason for
the observed effect is a multifold decrease in the peptide’s affinity to an eukaryotic cellular membrane enriched with zwitterionic phospholipids.
Reconstruction of Purine Metabolism in Bacillus subtilis to Obtain the Strain Producer of AICAR: A New Drug with a Wide Range of Therapeutic Applications
K.V. Lobanov, L. Errais Lopes, N.V. Korol’kova, B.V. Tyaglov, A.V. Glazunov, R.S. Shakulov, A.S. Mironov*
State Research Institute for Genetics and Selection of Industrial Microorganisms
AICAR is a natural compound, an analogue and precursor of adenosine. As activator of AMP-activated protein kinase (AMPK), AICAR has a broad therapeutic potential, since it normalizes the carbohydrate and lipid metabolism and inhibits the proliferation of tumor cells. The synthesis of AICAR in Bacillus subtilis cells is controlled by the enzymes of purine biosynthesis; their genes constituting purine operon (pur-operon). Reconstruction of purine metabolism in B. subtilis was performed to achieve overproduction of AICAR. For this purpose, the gene purH, which encodes formyltransferase/IMP-cyclohydrolase, an enzyme that controls the conversion of AICAR to IMP, was removed from the B. subtilis genome, ensuring the accumulation of AICAR. An insertion
inactivating the gene purR that encodes the negative transcriptional regulator of the purine biosynthesis operon was introduced into the B.subtilis chromosome in order to boost the production of AICAR; the transcription attenuator located in the leader sequence of pur-operon was deleted. Furthermore, the expression integrative vector carrying a strong promoter of the rpsF gene encoding the ribosomal protein S6 was designed. The heterologous Escherichia coli gene purF encoding the first enzyme of the biosynthesis of purines with impaired allosteric regulation, as well as the modified E.coli gene prs responsible for the synthesis of the precursor of purines — phosphoribosyl pyrophosphate (PRPP) — was cloned into this vector under the control of the rpsF gene promoter. The modified purF and prs genes were inserted into the chromosome of the B. subtilis strain. B. subtilis strain obtained by these genetic manipulations accumulates 11–13 g/L of AICAR in the culture fluid.
Posttranslational Modifications of Ribosomal Proteins in Escherich ia coli
M. V. Nesterchuk*, P. V. Sergiev, O. A. Dontsova
Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University
Faculty of Chemistry, Lomonosov Moscow State University
А number of ribosomal proteins in Escherichia coli undergo posttranslational modifications. Six ribosomal proteins are methylated (S11, L3, L11, L7/L12, L16, and L33), three proteins are acetylated (S5, S18, and L7), and protein S12 is methylthiolated. Extra amino acid residues are added to protein S6. С-terminal amino acid residues are partially removed from protein L31. The functional significance of these modifications has remained unclear. These modifications are not vital to the cells, and it is likely that they have regulatory functions. This paper reviews all the known posttranslational modifications of ribosomal proteins in Escherichia coli. Certain enzymes responsible for the modifications and mechanisms of enzymatic reactions are also discussed.
Dimeric Structure of the Transmembrane Domain of Glycophorin A in Lipidic and Detergent Environments
K.S. Mineev, E.V. Bocharov*, P.E. Volynsky, M.V. Goncharuk, E.N. Tkach, Ya.S. Ermolyuk, A.A. Schulga, V.V. Chupin, I.V. Maslennikov, R.G. Efremov, A.S. Arseniev
Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences
Received 24.02. 2011
Specific interactions between transmembrane α-helices, to a large extent, determine the biological function of integral membrane proteins upon normal development and in pathological states of an organism. Various membrane-like media, partially those mimicking the conditions of multicomponent biological membranes, are used to study the structural and thermodynamic features that define the character of oligomerization of transmembrane helical segments. The choice of the composition of the membrane-mimicking medium is conducted in an effort to obtain a biologically relevant conformation of the protein complex and a sample that
would be stable enough to allow to perform a series of long-term experiments with its use. In the present work, heteronuclear NMR spectroscopy and molecular dynamics simulations were used to demonstrate that the two most widely used media (detergent DPC micelles and lipid DMPC/DHPC bicelles) enable to perform structural studies of the specific interactions between transmembrane ?-helices by the example of dimerizing the transmembrane domain of the bitopic protein glycophorin A. However, a number of peculiarities place lipid bicelles closer to natural lipid bilayers in terms of their physical properties.
O. A. Zorina, A. A. Kulakov,
O. A. Boriskina, D. V. Rebrikov
Relationship between the Pathogenic Representatives of Periodontal Pockets Microbiocenosis in Patients with Periodontitis with Varying Degrees of Severity
O. A. Zorina1*, A. A. Kulakov1, O. A. Boriskina1, D. V. Rebrikov2,3 1Central Research Institute of Dentistry and Oral Surgery 2Vavilov Institute of General Genetics, Russian Academy of Sciences 3Scientific Production Enterprise «DNA Technology», JSC
Periodontitis is a common disease that is considered to be a manifestation of the distortion of the ratio between the normal and conditionally pathogenic microflora of periodontal pockets. In this study, the ratio between the six most important periodontal pathogens and the total microflora of the periodontal pocket in healthy individuals and patients with varying severity of periodontitis was ascertained by quantitative real-time PCR. It was ascertained that the relative content of Porphyromonas gingivalis, Prevotella intermedia, and Tannerella forsythensis (Bacteroides forsythus) persistently develops in the total microflora of the periodontal pocket upon progressing periodontitis; this value is higher than that in the control group by more than two orders of magnitude upon a severe degree of chronic generalized periodontitis.
The Effects of β2-Adrenoreceptor Activation on the Contractility, Ca-Signals and Nitric Oxide Production in the Mouse Atria
Yu. G. Odnoshivkina, A. M. Petrov*, A. L. Zefirov
Kazan State Medical University, Federal Agency for Health Care and Social Development
The effects of the selective β2-adrenoreceptor agonist (fenoterol) on the functioning of mouse atrial were studied using both tensometry and fluorescent methods. It has been demonstrated that with the use of a high concentration of fenoterol (in the range of 1–50 μM), there is a more significant positive inotropic effect observed within a shorter period of time. In the case of relatively low doses of fenoterol (1 and 5 μM), its contractility effects are observed 20 min after the application of agonist, whereby in the case of high concentrations (25, 50 and 300 μM), the effects appear within the first minutes. During the first 10–15 min, 5 μM fenoterol causes an increase in the amplitude of Ca-signals in cardiomyocytes (this indicates an increase in the concentration of Ca ions during systole) and the activation of NO synthesis. However, after 20 min, the production of NO decreases; while the amplitude of Ca-signals remains high. The application of 50 μM fenoterol leads to a rapid increase in the amplitude of Ca-signals: at the same time, it causes a decrease in the production of NO, which we found to begin to increase after 10 min of agonist application. It is suggested that the dynamics of the positive inotropic effect occurring under pharmacological stimulation of β2-adrenoreceptors depend on the rate of increase in the amplitude of Ca-signals and on the degree of NO synthesis.
M. V. Arkhipenko, E. K. Petrova, N. A. Nikitin, A. D. Protopopova, E. V. Dubrovin, I. V. Yaminskii, N. P. Rodionova, O. V. Karpova, J. G. Atabekov
Characteristics of Artificial Virus-likeParticles Assembled in vitro from Potato Virus X Coat Protein and Foreign Viral RNAs
M. V. Arkhipenko1, E. K. Petrova1, N. A. Nikitin1, A. D. Protopopova2,3, E. V. Dubrovin3, I. V. Yaminskii2,3, N. P. Rodionova1, O. V. Karpova1*, J. G. Atabekov1,4 1Biology Department, Lomonosov Moscow State University 2Advanced Technologies Center 3Physical Department, Lomonosov Moscow State University 4Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University
Received 21.04. 2011
Potato virus X (PVX) and some other potexviruses can be reconstituted in vitro from viral coat protein (CP) and RNA. PVX CP is capable of forming viral ribonucleoprotein complexes (vRNP) not only with homologous, but also with foreign RNAs. This paper presents the structure and properties of vRNP assembled in vitro upon incubation of PVX CP and RNAs of various plant and animal viruses belonging to different taxonomic groups. We have shown that the morphology and translational properties of vRNPs containing foreign (heterologous) RNA are identical to those of homological vRNP (PVX RNA – PVX CP). Our data suggest that the assembly of the “mixed” vRNP in vitro could be started at the 5’-proximal region of the RNA, producing a helical structure of RNPs with foreign nucleic acids. The formation of heterologous vRNP in vitro with PVX CP appears not to require a specific 5’ end RNA nucleotide sequence, and the PVX CP seems to be able to pack foreign genetic material of various sizes and compositions into artificial virus-like particles.
R. A. Timakhov, P. O. Fedichev, A. A. Vinnik, J. R. Testa, O. O. Favorova
Transcription Factor DLX5 As a New Target for Promising Antitumor Agents
R. A. Timakhov1,2,3*, P. O. Fedichev1, A. A. Vinnik1, J. R. Testa3, O. O. Favorova2 1Quantum Pharmaceuticals, Russia 2Pirogov Russian National Research Medical University 3Fox Chase Cancer Centre, Philadelphia, USA
The crystal structure of the human transcription factor DLX5 has been used for the screening of a library consisting of 106 compounds by the molecular docking technique. In vitro tests of the 14 top-rated ligands showed that compound Q12 displays the best ability to inhibit the proliferation of Dlx5 positive mouse lymphoma cells, which correlates with the down-regulation of c-myc expression. Compound Q12 has low toxicity on normal human ovarian epithelial cells and mouse lymphoma cells with absent expression of Dlx5, and can be used for further chemical optimization and for the development of novel, highly efficient cancer treatments.
DLX5; transcription factor; small molecules; cancer; molecular docking.
Effective Genetic Expression of Nanoantibodies by Recombinant Adenoviral Vector in vitro
I.Yu. Gribova1, S.V. Tillib2, I.L. Tutykhina1, М.М. Shmarov1, D.Yu. Logunov1, L.V. Verkhovskaya1, B.S. Naroditskii1*, A.L. Gintsburg1 1GamaleyaResearch Institute for Epidemiology and Microbiology 2nstitute of Gene Biology, Russian Academy of Sciences
The present study is devoted to the feasibility of expressing the single-domain mini-antibody (nanoantibody) selected from the library of sequences of the variable domains of special single-stranded antibodies derived from an immunized camel, a gene of which was introduced into eukaryotic cells within a recombinant adenoviral vector. A vector bearing the gene of a single-domain nanoantibody was obtained using the AdEasy Adenoviral Vector System (Stratagene). This method of delivering the nanoantibody gene facilitates efficient expression of this gene and functional activity of the nanoantibody. The results obtained can be used to produce passive immunizing tools against pathogens or new-generation immunobiological antitoxic medication.
Rabin8 Protein Interacts with GTPase Rheb and Inhibits Phosphorylation of Ser235/Ser236 in Small Ribosomal Subunit Protein S6
А. А. Parkhitko1,2,3*, О. О. Favorova1, E. P. Henske2,3 1Pirogov Russian National Research Medical University 2Fox Chase Cancer Center, Philadelphia, USA 3Brigham and Women’s Hospital, Harvard Medical School, USA
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that in association with Raptor, mLST8, PRAS40 and Deptor forms a complex (mTORC1) playing the key role in the regulation of protein biosynthesis, transcription, cellular metabolism, apoptosis and autophagy; mainly via direct phosphorylation of S6 kinases. mTORC1 is activated by growth factors and amino acids via the activation of Rheb GTPase. In the current study, we demonstrate for the first time that the over-expression of Rabin8, which functions as a guanine nucleotide exchange factor for Rab8 GTPase, suppresses phosphorylation of Ser235/Ser236 in ribosomal protein S6. Downregulation of Rabin8 using small interfering RNA (siRNA) increases the phosphorylation of
Ser235/Ser236 in ribosomal protein S6. Furthermore, Rabin8 can be immunoprecipitated with Rheb GTPase. These results suggest the existence of a novel mechanism of mTORС1 regulation and its downstream processes. Since Rabin8 is a known regulator of ciliogenesis, a potential link can exist between regulation of Rheb/mTORC1 and ciliogenesis.
complex mTORC1; Rheb; Rabin8; small ribosomal unit protein S6.
DMEM – Dulbecco’s Modified Eagle’s Medium; FBS – fetal bovine serum; GAP protein – GTPase-activating protein; mTOR – mammalian target of Rapamycin; Rheb – Ras homologue enriched in brain; siRNA – small interfering RNA; TBST – Tris-Buffered Saline and Tween 20.
S. A. Goncharuk, M. V. Goncharuk, M. L. Mayzel, D. M. Lesovoy, V. V. Chupin, E.V. Bocharov, A.S. Arseniev, M.P. Kirpichnikov
Bacterial Synthesis and Purification of Normal and Mutant Forms of Human FGFR3 Transmembrane Segment
S.A. Goncharuk1,2*, M.V. Goncharuk1,2, M.L. Mayzel1, D.M. Lesovoy1, V.V. Chupin1, E.V. Bocharov1, A. S. Arseniev1, M. P. Kirpichnikov1,2 1Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Science 2Biology Department, Lomonosov Moscow State University
The fibroblast growth factor receptor 3 (FGFR3) is a protein belonging to the family of receptor tyrosine kinases. FGFR3 plays an important role in human skeletal development. Mutations in this protein, including Gly380Arg or Ala391Glu substitutions in the transmembrane (TM) region, can cause different disorders in bone development. The determination of the spatial structure of the FGFR3 TM domain in a normal protein and in a protein with single Gly380Arg and Ala391Glu mutations is essential in order to understand the mechanisms that control dimerization and signal transduction by receptor tyrosine kinases. The effective system of expression of eukaryotic genes in bacteria and the purification protocol for the production of milligram amounts of both normal TM fragments of FGFR3 and those with single pathogenic mutations Gly380Arg and Ala391Glu, as well as their 15N- and [15N, 13C]-isotope-labelled derivatives, were described. Each peptide was produced in Escherichia coli BL21(DE3)pLysS cells as a C-terminal extension of thioredoxin A. The purification protocol involved immobilized metal affinity chromatography and cation- and anion-exchange chromatography, as well as the fusion protein cleavage with the light subunit of human enterokinase. The efficiency of the incorporation of target peptides into DPC/SDS and DPC/DPG micelles was confirmed using NMR spectroscopy. The described methodology of production of the native FGFR3 TM domain in norma and with single Gly380Arg and Ala391Glu mutations enables one to study their spatial structure using high-resolution heteronuclear NMR spectroscopy.
O.V. Koliasnikov, V.G. Grigorenko, A.M. Egorov, S. Lange, R.D. Schmid
Recombinant Production of Horseradish Peroxidase Conjugates with Fab Antibodies in Pichia pastoris for Analytical Applications
O.V. Koliasnikov1,2#, V.G. Grigorenko2*#, A.M. Egorov2, S. Lange3, R.D. Schmid3 1Kolmogorov Advanced Education and Science Center, Lomonosov Moscow State University 2Department of Chemistry, Lomonosov Moscow State University 3Institute of Technical Biochemistry, University of Stuttgart
#The authors provided equivalent contributions to the study.
Recombinant immunoconjugates of marker enzymes with antigens or antibodies present considerably more advantages than those obtained by conventional methods of chemical synthesis; i.e. they are homogeneous, have a strictly determined stoichiometry, and retain the functional activity of both a marker protein and an antigen/antibody. Based on the pPICZ?B shuttle vector, we first managed to obtain a recombinant conjugate of key marker enzyme horseradish peroxidase (HRP) with Fab fragments of antibodies against atrazine. The resulting genetic construction allows us to switch to any other antibody sequence, via the simple re-cloning of variable parts and an additional reporter enzyme. Conjugates were successfully produced in the Pichia pastoris methylotrophic yeast expression system. The target activity of the conjugates (both enzymatic and antigen-binding) has been demonstrated by ELISA method.
Atomic Force Microscopy Study of the Arrangement and Mechanical Properties of Astrocytic Cytoskeleton in Growth Medium
Yu.M. Efremov1*, E.V. Dzyubenko1,2, D.V. Bagrov1, G.V. Maksimov1, S.I. Shram2, K.V. Shaitan1
1Biological Department, Lomonosov Moscow State University
2Institute of Molecular Genetics, Russian Academy of Sciences
Astrocytes are quite interesting to study because of their role in the development of various neurodegenerative disorders. The present work describes an examination of the arrangement and mechanical properties of cytoskeleton of living astrocytes using atomic force microscopy (AFM). The experiments were performed with an organotypic culture of dorsal root ganglia (DRG) obtained from a chicken embryo. The cells were cultivated on a gelatinous substrate and showed strong adhesion. AFM allows one to observe cytoskeleton fibers, which are interpreted as actin filaments and microtubules. This assumption is supported by confocal microscopy fluorescence imaging of ?-tubulin and fibrillar actin. Mapping of the local Young’s modulus of a living astrocyte showed that the stiff areas correspond to the sites where the cytoskeleton fibers are located. Thus, the data obtained indicate that AFM is a promising method to study neural cells cytoskeleton integrity and arrangement in in vitro models of neurodegeneration.
atomic force microscopy; dorsal root ganglia; force spectroscopy; confocal microscopy; cytoskeleton.
Logunov, D. V. Shchebliakov, M. M. Shmarov, E. E. Khodunova, I. V. Galtseva, R. V. Belousova, B.S. Naroditsky, A. L. Gintsburg
An Efficient Method for the Delivery of the Interleukin-2 Gene to Human Hematopoietic Cells using the Fiber-Modified Recombinant Adenovirus
V. N. Rogozhin1,2*, D. Yu. Logunov1, D. V. Shchebliakov1, M. M. Shmarov1, E. E. Khodunova3, I. V. Galtseva3, R. V. Belousova2, B. S. Naroditsky1, A. L. Gintsburg1 1Gamaleya Research Institute of Epidemiology and Microbiology, Ministry of Health and Social Development of the Russian Federation 2Moscow state academy of veterinary medicine and biotechnology named K.I. Skryabin 3National Research Center for Hematology, Ministry of Health and Social Development of the Russian Federation
Recombinant human adenovirus serotype 5 (Ad5/35F-IL2) with modified fibres containing the C-terminal domain fiber-knob of human adenovirus serotype 35, carrying the gene of recombinant human IL-2, has been designed. As a result of the fiber modification, the adenovirus can efficiently deliver the genetic information to bone marrow leukocytes and the tumor blood cells KG-1A (human myeloblastic leukemia cells) and U937 (human histiocytic lymphoma cells), which are normally resistant to Ad5 infection. The flow cytometry data reveal that the modified Ad5/35F penetrates into a population of monocytes, granulocytes, and blast cells of human bone marrow. The expression of interleukin-2 in CAR-negative bone marrow
leukocytes (3682.52 ± 134.21 pg/ml) and the cell lines KG-1A (748.3 ± 32.8 pg/ml) and U937 (421.5 ± 59.4 pg/ml) transduced with adenovirus Ad5/35F-IL2 is demonstrated. The fiber-modified adenovirus can be used as a vector for the efficient gene delivery of interleukin-2 to human normal and tumor hematopoietic cells.
Ad – human adenovirus; Ad5 – Ad serotype 5; Ad35 – Ad serotype 35; Ad5/35F – fiber-modified recombinant Ad5; UV – ultraviolet radiation; RBM – red bone marrow; IL2 – human interleukin-2; CAR – coxsackievirus and adenovirus receptor; aa – amino acid residue; pfu – plaque-forming unit.
Clinical Use of Inhibitors of HIV-1 Integration: Problems and Prospects
S. P. Korolev1*, Yu. Yu. Agapkina1, M.B. Gottikh1,2 1Department of Chemistry, Lomonosov Moscow State University 2Belozersky Research Institute of Physico-Chemical Biology, Lomonosov Moscow State University
The HIV-1 integrase enzyme is responsible for one of the key stages of retroviral replication; it acts as a catalyst for the integration of viral cDNA into the cell’s genome. Inhibitors of HIV-1 integration have been under development for over 10 years; yet, only one integration inhibitor, raltegravir, has been approved for clinical use so far. Raltegravir binds two metal ions in the enzyme’s active centre and blocks one of the integration stages: the strand transfer. Unfortunately, the clinical use of raltegravir results in the development of viral resistance among some patients. Several more HIV-1 integration inhibitors are undergoing clinical trials at the
moment. However, the structure and mechanism of action of those are similar to raltegravir, which results in the emergence of cross resistance with raltegravir. The present review is focused on the history of the development and clinical trials of raltegravir and its analogues, the problems connected with the emergence of viral resistance to integration inhibitors, and the prospect of their future clinical use.
HIV-1 integrase; inhibition; mechanism of action; raltegravir.
HAART – highly active antiretroviral therapy; HIV-1 – human immunodeficiency virus type 1; IN – integrase; ST – strand transfer; AIDS – acquired immunodeficiency syndrome; AUC – area under the pharmacokinetic curve (concentration–time curve) – the change in concentration of the active component in blood plasma or serum over time; СIC50 – the inhibitor concentration at which the cytopathogenic effect of the virus in the infected cells decreases by 50%; CIC95 – the inhibitor concentration at which the cytopathogenic effect of the virus in the infected cells decreases by 95%; Сlp – clearance, or the extraction ratio – the index showing the rate of extraction of a substance from blood plasma during the biotransformation of this substance, its redistribution in the organism, and excretion; Cmax – the maximum or peak of concentration of an active component in blood; EC50 – inhibitor concentration, at which in vivo replication of the virus is suppressed by 50%; EC90 – inhibitor concentration, at which in vivo replication of the virus is suppressed by 90%; F – bioavailability – the fraction of a dose of unchanged drug administered orally that reaches the systemic circulation; FBS – fetal bovine serum; FDA – Federal Drug Administration (United States); IC50 – inhibitor concentration, at which the enzyme activity is suppressed by 50%; NHS – normal human serum; PPB – percentage plasma protein binding; Т1/2 – time by which the concentration of a drug in plasma decreases twice; WT – wild type.
I. A. Akimov, E. L. Chernolovskaya, Yu. E. Spitsyna, E. I. Ryabchikova,
and M. A. Zenkova
Silencing of Her2, CCNB1 and PKC Genes by siRNA Results in Prolonged Retardation of Neuroblastoma Cell Division
I. A. Akimov, E. L. Chernolovskaya*, Yu. E. Spitsyna, E. I. Ryabchikova, M. A. Zenkova
Institute of Chemical Biology and Fundamental Medicine, Siberian Branch, Russian Academy of Sciences
Deregulation of the expression of the genes that are involved in the control of the cell cycle impairs cellular differentiation and leads to cell death. This process can result in uncontrollable cell proliferation and, subsequently, cancer development. In this study, we examined the effect of the silencing of cancer-related genes by small interfering RNAs (siRNA) targeted at mRNA of Her2, cyclin B1 (CCNB1), and protein kinase C (PKC) on the proliferation of human cancer cells of different origins. Maximum silencing of CCNB1, Her2 (in KB-3-1, SKN-MC, MCF-7 cells), and PKC (in MCF-7 cells) was achieved 72 h after transfection of the corresponding siRNAs, and 12 days after the transfection, the initial levels of the target mRNAs were fully recovered. Silencing of Her2, CCNB1, and PKC differently effected the proliferation of the cell lines under study. The most pronounced antiproliferative action of the investigated siRNAs was observed in neuroblastoma SK-N-MC cells (3 – 10-fold reduction in the proliferation rate) even after the recovery of the initial levels of expression of the Her2, CCNB1, and PKС genes. The obtained data indicate that the CCNB1 and PKC genes can be used as targets in the development of drugs for neuroblastoma treatment.
L. U. Dzhemileva, O. L. Posukh, N. A. Barashkov, S. A. Fedorova, F. M. Teryutin, V. L. Akhmetova,
I. M. Khidiyatova, R. I. Khusainova, S. L. Lobov, E. K. Khusnutdinova
Haplotype Diversity and Reconstruction of Ancestral Haplotype Associated with the c.35delG Mutation in the GJB2 (Cx26) Gene among the Volgo-Ural Populations of Russia
L. U. Dzhemileva1*, O. L. Posukh2, N. A. Barashkov3, S. A. Fedorova3, F. M. Teryutin3, V. L. Akhmetova1, I. M. Khidiyatova1, R. I. Khusainova1, S. L. Lobov1, E. K. Khusnutdinova1 1Institute of Biochemistry and Genetics, Ufa Research Center, Russian Academy of Sciences 2Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences 3Yakut Research Center of Complex Medical Problems, Siberian Branch, Russian Academy of Medical Sciences
*E-mail: firstname.lastname@example.org Received 23.03.2011
The mutations in the GJB2 (Сх26) gene make the biggest contribution to hereditary hearing loss. The spectrum and prevalence of the GJB2 gene mutations are specific to populations of different ethnic origins. For several GJB2 mutations, their origin from appropriate ancestral founder chromosome was shown, approximate estimations of “age” obtained, and presumable regions of their origin outlined. This work presents the results of the carrier frequencies’ analysis of the major (for European countries) mutation c.35delG (GJB2 gene) among 2,308 healthy individuals from 18 Eurasian populations of different ethnic origins: Bashkirs, Tatars, Chuvashs, Udmurts, Komi-Permyaks, Mordvins, and Russians (the Volga-Ural region of Russia); Byelorussians, Ukrainians (Eastern Europe); Abkhazians, Avars, Cherkessians, and Ingushes (Caucasus); Kazakhs, Uzbeks, Uighurs (Central Asia); and Yakuts, and Altaians (Siberia). The prevalence of the c.35delG mutation in the studied ethnic groups may act as additional evidence for a prospective role of the founder effect in the origin and distribution of this mutation in various populations worldwide. The haplotype analysis of chromosomes with the c.35delG mutation in patients with nonsyndromic sensorineural hearing loss (N=112) and in population samples (N =358) permitted the reconstruction of an ancestral haplotype with this mutation, established the common origin of the majority of the studied mutant chromosomes, and provided the estimated time of the c.35delG mutation carriers expansion (11,800 years) on the territory of the Volga-Ural region.
hereditary nonsyndromic sensorineural hearing loss; GJB2 (Cx26) gene; c.35delG mutation; ancestral haplotype; populations of the Volga-Ural region.
A. S. Davydova, M. A. Vorobjeva, A. G. Venyaminova
Escort Aptamers: New Tools for the Targeted Delivery of Therapeutics into Cells
A. S. Davydova, M. A. Vorobjeva*, A. G. Venyaminova
Institute of Chemical Biology and Fundamental Medicine, Siberian Branch, Russian Academy of Sciences
Escort aptamers are DNA or RNA sequences with high affinity to certain cell-surface proteins, which can be used for targeted delivery of various agents into cells of a definite type. The peculiarities of the selection of escort aptamers are discussed in this review. The methods used in selection of escort aptamers via the SELEX technique are considered, including selection against isolated cell-surface proteins, cell fragments, living eukaryotic cells, and bacteria. Particular attention is given to the design and chemical modification of escort aptamers.
The different fields of application of escort aptamers are described, including the targeted delivery of siRNAs, nanoparticles, toxins, and photoagents, as well as the identification of specific cell markers and the detection or isolation of cells of a definite type. The potential for the application of escort aptamers in the development of new therapeutic agents and diagnostic systems is also discussed.
SELEX method; NA aptamers; escort aptamers; specific cell binding; addressed cell delivery; detection of cells.
dsDNA – double-stranded DNA; ssDNA – single-stranded DNA; siRNA – small interfering RNA; PSMA – prostate-specific membrane antigen; IC50 – therapeutical concentration required to suppress the growth of 50% cells; Kd– apparent constant of dissociation of the aptamer–target complex; LNA – locked nucleic acids; SELEX – Systematic Evolution of Ligands by EXponential Enrichment.
N. I. Kalinina, V. Yu. Sysoeva, K. A. Rubina, Ye. V. Parfenova, V. A. Tkachuk
Mesenchymal Stem Cells in Tissue Growth and Repair
N. I. Kalinina*, V. Yu. Sysoeva, K. A. Rubina, Ye. V. Parfenova, V. A. Tkachuk
Department of Fundamental Medicine, Lomonosov Moscow State University
It has been established in the recent several decades that stem cells play a crucial role in tissue renewal and regeneration. Mesenchymal stem cells (MSCs) are part of the most important population of adult stem cells. These cells have hereby been identified for the very first time and subsequently isolated from bone marrow stroma. Bone marrow-derived MSCs have been believed to play the role of a source of cells for the renewal and repair of connective tissues, including bone, cartilage and adipose tissues. Cells similar to bone marrow-derived MSCs have now been identified in all postnatal tissues. Data on the distribution and function of MSCs in vivo collected using novel approaches pertaining to the identification of MSCs in situ, to their isolation from tissues, and finally to the determination of their biological properties have enabled successful revision of the role of MSCs in various organs and tissues. This review summarizes our own, as well as others’, data concerning the role of MSCs in the regulation processes of tissue repair and regeneration. In our opinion, MSCs provide the connection between the blood-vascular, immune, endocrine, and nervous systems and tissue-specific stem cells in the body.
A.A. Alekseeva1,2,3, S.S. Savin2,3, V.I. Tishkov,2,3*1 1Chemistry Department, Lomonosov Moscow State University 2Innovations and High Technologies MSU Ltd 3Bach Institute of Biochemistry, Russian Academy of Sciences
NADsup>+--dependent formate dehydrogenase (FDH, EC 188.8.131.52) widely occurs in nature. FDH consists of two identical subunits and contains neither prosthetic groups nor metal ions. This type of FDH was found in different microorganisms (including pathogenic ones), such as bacteria, yeasts, fungi, and plants. As opposed to microbiological FDHs functioning in cytoplasm, plant FDHs localize in mitochondria. Formate dehydrogenase activity was first discovered as early as in 1921 in plant; however, until the past decade FDHs from plants had been considerably less studied than the enzymes from microorganisms. This review summarizes the recent results on studying the physiological role, properties, structure, and protein engineering of plant formate dehydrogenases.
Behavior of Transplanted Multipotent Cells after in Vitro Transplantation into the Damaged Retina
S.A. Sergeev1*, Y.V. Khramova1, M.L Semenova1, I.N. Saburina2, N.V. Kosheleva1,2 1Biology Faculty, Lomonosov Moscow State University 2Institute of General Pathology and Pathophysiology, Russian Academy of Medical Sciences
The use of stem cell technologies in retinal defect reparation therapy has produced beneficial results. Nowadays, numerous protocols exist which provide a neural differentiation of the stem cells transplanted into the retina. However, questions concerning the functional replacement of the missing retinal neurons by transplanted cells thus far remain unanswered. The organotypic culture protocol was used in this study in order to prove the possibility of transdifferentiation of bone marrow stromal cells (MMSCs) and neural stem/progenitor cells (NSPCs) from EGFP-positive mice and the functional integration of these cells. This technique enables a detailed characterization of cell behavior post-transplantation. Using atomic force microscopy, we reliably demonstrated the difference (p < 0.01) between the thickness of the outgrowths formed by glial and endothelial retina cells and the thickness of neurites and neuro-like transplanted MMSC outgrowths. MMSCs are also shown to form synapses up to 2.5 ± 0.06 µm in diameter on day 4 after the transplantation. Following electrical stimulation (20V, 0.5Hz, 200ms), clear depolarization of retinal neurons and their outgrowths is detected. It is shown
that some of these GFP+ MMSCs, which changed their morphology after the transplantation in retinal explants to neuro-like MMSCs, are capable of depolarizing after exogenous stimulation.
Effect of Sodium Chloride on Aggregation of Merocyanine 540 and Photosensitized Inactivation of Staphylococcus aureus and Pseudomonas aeruginosa
T.A. Shmigol1, V.A. Bekhalo2*, Е.V. Sysolyatina2, E.V. Nagurskaya2, S.A. Ermolaeva2, A.Ya. Potapenko1 1Pirogov Russian National Research Medical University 2Gamaleya Research Institute of Epidemiology and Microbiology, Ministry of Health and Social
Development of the Russian Federation
Merocyanine 540 (MC540) is used as a photosensitizer for the inactivation of microorganisms. The following is already known about MC540: firstly, MC540 exists in distilled water in both monomeric and dimeric forms, and the addition of salts into a MC540 solution leads to the formation of large aggregates that can be detected by the resonance light scattering technique. Secondly, singlet oxygen can only be photogenerated by MC540 monomers. In the present work, we studied the effect of MC540 in the aggregated state on the rate of photosensitized inactivation of Staphylococcus aureus and Pseudomonas aeruginosa. To this end, bacteria either in MC540-containing distilled water or in a 0.25 M sodium chloride aqueous solution also containing MC540 are irradiated (546 nm). The results show that, in the presence of salt, the aggregation of MC540 greatly increases the efficiency of the MC540-photosensitized inactivation of P. aeruginosa and S. aureus. In the presence of salt, the rates of P. aeruginosa and S. aureus inactivation increase by factors of 10 and 30, respectively, in comparison with the rate of inactivation observed in the case of distilled water. Our results suggest that a salt-induced photosensitization mechanism can switch from the singlet oxygen to the free-radical pathway.
Y.P. Rubtsov, Y.G. Suzdaltseva, K.V. Goryunov, N.I. Kalinina, V. Y. Sysoeva, V. A. Tkachuk
Regulation of Immunity via Multipotent Mesenchymal Stromal Cells
Y. P. Rubtsov1*, Y. G. Suzdaltseva2, K. V. Goryunov1, N. I. Kalinina1, V. Y. Sysoeva1, V. A. Tkachuk1 1Faculty of Fundamental Medicine, Lomonosov Moscow State University 2Institute of Experimental Cardiology
Immune cells responsible for inflammation development are involved in tissue damage caused by wounding and various pathologies. Control of immune cell activation could be of significant benefit for regenerative medicine and the treatment of patients with autoimmune and degenerative diseases. It is a proven fact that MCSs (multipotent mesenchymal stromal cells) are capable of suppressing immune responses via the inhibition of dendritic cell maturation and via the restraining of the T, B, and NK cell function in the course of autoimmune diseases and various forms of inflammation. MSCs can be isolated easily from almost every type of tissue or organ and subsequently expanded in vitro. These cells are self-renewable and can be differentiated into various cell types of mesenchymal lineage. The current review contains a collection and critical analysis of data regarding the molecular mechanisms responsible for cross-talk between immune cells and MSCs. Some of these mechanisms can be used for the development of new practical approaches for the treatment of autoimmune diseases.
M.M. Prokofjeva, P.V. Spirin, D.V. Yanvarev, A.V. Ivanov, M.S. Novikov, O.A. Stepanov, M.B. Gottikh, S.N. Kochetkov, B. Fehse, C. Stocking, V.S. Prassolov
Screening of Potential HIV-1 Inhibitors/Replication Blockers Using Secure Lentiviral in Vitro System
M.M. Prokofjeva1, P.V. Spirin1, D.V. Yanvarev1, A.V. Ivanov1, M.S. Novikov2, O.A. Stepanov1, M.B. Gottikh3, S.N. Kochetkov1, B. Fehse4, C. Stocking5, V.S. Prassolov1* 1Engelhardt Institute of Molecular Biology, Russian Academy of Sciences 2Volgograd State Medical University 3Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University 4Research Department Cell and Gene Therapy, Department for Stem Cell Transplantation University Medical Center Hamburg-Eppendorf 5Heinrich-Pette-Institute for Experimental Virology and Immunology
The development and usage of safe cell systems for testing agents which possess anti-HIV activity is a very important factor in the design of new drugs. We have described in detail a system we designed that is based on lentiviral vectors (Prokofjeva et. al., Antiviral Therapy, in print) for swift and completely safe screening of potential HIV-1 replication inhibitors. The system enables one to test the efficiency of the inhibitory activity of compounds whose action is directed towards either wild-type HIV-1 reverse transcriptase or integrase, or mutant enzymes corresponding to the drug-resistant virus form. Testing results of a number of already known drugs, which correlate well with published data as well as data on newly synthesized compounds, were obtained. Application of this system substantially broadens the possibilities of preclinical anti-HIV drugs testing.
L. G. Tyulkina, E. V. Skurat, O.Yu. Frolova, T.V. Komarova, E. M. Karger, I.G. Atabekov
New Viral Vector for Superproduction of Epitopes of Vaccine Proteins in Plants
L. G. Tyulkina1, E. V. Skurat1, O. Yu. Frolova2, T. V. Komarova2, E. M. Karger2, I. G. Atabekov1* 1Faculty of Biology, Lomonosov Moscow State University 2Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University
*E-mail: email@example.com Received 20.06.2011
The novel viral vectors PVX-CP AltMV and PVXdt-CP AltMV are superexpressors of the capsid protein (CP). These viral vectors were constructed on the basis of the potato virus X (PVX) genome and Alternanthera mosaic virus (AltMV) CP gene. The expression, based on the hybrid viral vectors, is genetically safe, since the systemic transport and formation of infective viral particles are blocked. CP AltMV can self-assemble into virus-like particles (VLPs) in the absence of genomic RNA. The vectors can be used for the presentation of foreign peptides (including epitopes of human pathogens) on the surface of the VLP. The N-terminal extracellular domain (M2e) of the influenza virus A M2 protein and its truncated variant (ΔM2e) were used as model heterologous peptides for the construction of the chimeric CP AltMV. Chimeric CP AltMV retains its ability to self-assemble into VLP. The epitopes of the M2 influenza virus protein were not eliminated during the process of accumulation, polymerization and purification of chimeric VLP AltMV, providing evidence of the stability of chimeric VLP with C-terminal heterologous epitopes. It appears that VLP produced by the vectors PVXCP AltMV and PVXdt-CP AltMV can be used in the field of biotechnology for the presentation of the epitopes of vaccine proteins on their surfaces. The chimeric VLP AltMV with the presented foreign epitopes can be used as candidate vaccines.
Triggering of Toll-like Receptor-2 in Mouse Myelomonocytic Leukaemia Cells WEHI-3B Leads to the Suppression of Apoptosis and Promotes Tumor Progression in Vivo
D.V. Shcheblyakov*, D.Y. Logunov, I.V. Rakovskaya, M.M. Shmarov, B.S. Naroditsky, A.L. Ginzburg
Gamaleya Research Institute of Epidemiology and Microbiology, Russian Academy of Medical Sciences
Toll-like receptors are the essential components of innate immunity. It is shown that TLRs play an essential role in the immune resistance of an organism to bacterial and viral infections. The binding of TLR to its own ligands results in the activation of several adapter molecules and kinases, inducing the activation of the main pro-inflammatory transcriptional factors, which in turn induce the activation of the main pro-inflammatory transcriptional factors. This activation results in the development of both the innate immune response triggered by the enhanced expression of a number of pro-inflammatory cytokines and antimicrobial peptides and that of the adaptive immune response, via the activation of dendritic cells and enhancement of antigen presentation, etc. The ability of TLR agonists to bolster the immune reaction makes them promising for use in the therapy of infectious diseases and in the chemotherapy of malignant neoformations. However, different TLR ligands may have either antitumor activity (lipopolysaccharide, imiquimod, CpG) or, conversely, could beef up the resistance of tumor cells to apoptosis, stimulating their proliferation under certain conditions (lipopolysaccharide, lipopeptide). It has been shown that the TLR2-dependent signalling pathway in the myelomonocytic mouse leukaemia cell line WEHI-3B leads to the constitutive activation of the transcriptional factor NF-kB, suppression of apoptosis in tumor cells, and progression of myelomonocytic mouse leukaemia in vivo, upon the addition of TLR2 agonist (synthetic lipopeptide Pam2CSK4) or following the infection of tumor cells with Mycoplasma arginini.
Inhibition of DNA Gyrase by Levofloxacin and Related Fluorine-Containing Heterocyclic Compounds
V.L. Tunitskaya1*, A.R. Khomutov1, S.N. Kochetkov1, S.K. Kotovskaya2,3, V.N. Charushin2,3 1Engelhardt Institute of Molecular Biology, Russian Academy of Sciences 2Postovsky Institute of Organic Synthesis, Ural Branch, Russian Academy of Sciences 31Urals Federal University, Yekaterinburg, Russia
Fluoroquinolones are an important class of modern and efficient antibacterial drugs with a broad spectrum of activity. Levofloxacin (the optically active form of ofloxacin) is one of the most promising fluoroquinolone drugs, and its antibacterial activity is substantially higher than the activity of other drugs of the fluoroquinolone family. Earlier, in the Postovsky Institute of Organic Synthesis, UB RAS, an original method of levofloxacin synthesis was developed, and now the pilot batch of the drug is being prepared. Bacterial DNA gyrase is a specific target of fluoroquinolones; hence, the study of the enzyme-drug interaction is of theoretical and practical importance. Moreover, the parameters of DNA gyrase inhibition may serve as a criterion for drug quality. Here,
we present the results of studying the interaction of DNA gyrase with a number of fluoroquinolones and their analogs: intermediates and semi-products of the levofloxacin synthesis, and also samples from the pilot batches of this drug. The importance of two structural elements of the levofloxacin molecule for the efficiency of the inhibition is revealed. The data obtained may be useful for the design of new drugs derived from levofloxacin.
fluoroquinolones; levofloxacin; derivatives; bacterial DNA gyrase; enzymatic activity; inhibition.
The Fate of the Nucleolus during Mitosis: Comparative Analysis of Localization of Some Forms of Pre-rRNA by Fluorescent in Situ Hybridization in NIH/3T3 Mouse Fibroblasts
K.V. Shishova, О.О. Zharskaya, О.V. Zatsepina
Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences
*E-mail: firstname.lastname@example.org Received 10.06.2011
Nucleolus is the major structural domain of the cell nucleus, which in addition to proteins contains ribosomal RNA (rRNA) at different stages of maturation (or pre-rRNA). In mammals, the onset of mitosis is accompanied by the inhibition of rRNA synthesis, nucleolus disassembly, and the migration of pre-rRNA to the cytoplasm. However, the precise role of cytoplasmic pre-rRNA in mitosis remains unclear, and no comparative analysis of its different forms at consequent mitotic stages has thus far been performed. The focus of this research was the study of the localization of pre-rRNA in mitotic NIH/3T3 mouse fibroblasts by fluorescent in situ hybridization (FISH) with probes to several regions of mouse primary 47S pre-rRNA transcripts and by confocal laser microscopy. The results reveal that all types of pre-rRNA appear in the cytoplasm at the beginning of mitosis, following the breakdown of the nucleolus and nuclear envelope. However, not all pre-rRNA are transported by chromosomes from maternal cells into daughter cells. At the end of mitosis, all types of pre-rRNA and 28S rRNA can be visualized in nucleolus-derived foci (NDF), structures containing many proteins of mature nucleoli the appearance of which indicates the commencement of nucleologenesis. However, early NDF are enriched in less processed pre-RNA, whereas late NDF contain predominantly 28S rRNA. Altogether, the results of this study strengthen the hypotheses that postulate that different forms of pre-rRNA may play various roles in mitosis, and that NDF can be involved in the maturation of pre-rRNA, remaining preserved in the cytoplasm of dividing cells.
Deficient Response to Experimentally Induced Alkalosis in Mice with the Inactivated insrr Gene
I.E. Deyev1, D.I. Rzhevsky2, A.A. Berchatova1, O.V. Serova1, N.V. Popova1, A.N. Murashev2, A.G. Petrenko1* 1Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences 2Branch of Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Pushchino, Russian
Academy of Sciences
Currently, the molecular mechanisms of the acid-base equilibrium maintenance in the body remain poorly understood. The development of alkalosis under various pathological conditions poses an immediate threat to human life. Understanding the physiological mechanisms of alkalosis compensation may stimulate the development of new therapeutic approaches and new drugs for treatment. It was previously shown that the orphan insulin receptor-related receptor (IRR) is activated by mildly alkaline media. In this study, we analyzed mutant mice with targeted inactivation of the insrr gene encoding IRR, and revealed their phenotype related to disorders of the acid-base equilibrium. Higher concentrations of bicarbonate and CO2 were found in the blood of insrr knockout mice in response to metabolic alkalosis.
G. A. Stepanov, D. V. Semenov, E. V. Kuligina, O. A. Koval, I. V. Rabinov, Y. Y. Kit, V. A. Richter
Analogues of Artificial Human Box C/D Small Nucleolar RNA As Regulators of Alternative Splicing of a pre-mRNA Target
G. A. Stepanov1*, D. V. Semenov1, E. V. Kuligina1, O. A. Koval1, I. V. Rabinov1, Y.Y. Kit2, V.A. Richter1 1Institute of Chemical Biology and Fundamental Medicine, Siberian Branch, Russian Academy of Sciences 2Institute of Cell Biology, National Academy of Sciences of Ukraine
Small nucleolar RNAs (snoRNAs) play a key role in ribosomal RNA (rRNA) biogenesis. Box C/D snoRNAs guide the site-specific 2’-O-ribose methylation of nucleotides in rRNAs and small nuclear RNAs (snRNAs). A number of box C/D snoRNAs and their fragments have recently been reported to regulate posttranscriptional modifications and the alternative splicing of pre-mRNA. Artificial analogues of U24 snoRNAs directed to nucleotides in 28S and 18S rRNAs, as well as pre-mRNAs and mature mRNAs of human heat shock cognate protein (hsc70), were designed and synthesized in this study. It was found that after the transfection of MCF-7 human cells with artificial box C/D RNAs in complex with lipofectamine, snoRNA analogues penetrated into cells and accumulated in the cytoplasm and nucleus. It was demonstrated that the transfection of cultured human cells with artificial box C/D snoRNA targeted to pre-mRNAs induce partial splicing impairments. It was found that transfection with artificial snoRNAs directed to 18S and 28S rRNA nucleotides, significant for ribosome functioning, induce a decrease in MCF-7 cell viability.
small nucleolar box C/D RNAs; post-transcriptional RNA modification; alternative splicing of premRNA.
The Genetic Diversity and Structure of Linkage Disequilibrium of the MTHFR Gene in Populations of Northern Eurasia
E.A. Trifonova1, E.R. Eremina2, F.D. Urnov3, V.A. Stepanov1* 1Research Institute of Medical Genetics, Siberian Branch, Russian Academy of Medical Sciences 2Buryat State University 3University of California, Berkley, USA
The structure of the haplotypes and linkage disequilibrium (LD) of the methylenetetrahydrofolate reductase gene (MTHFR) in 9 population groups from Northern Eurasia and populations of the international HapMap project was investigated in the present study. The data suggest that the architecture of LD in the human genome is largely determined by the evolutionary history of populations; however, the results of phylogenetic and haplotype analyses seems to suggest that in fact there may be a common “old” mechanism for the formation of certain patterns of LD. Variability in the structure of LD and the level of diversity of MTHFR haplotypes cause a certain set of tagSNPs with an established prognostic significance for each population. In our opinion, the results obtained in the present study are of considerable interest for understanding multiple genetic phenomena: namely, the association of interpopulation differences in the patterns of LD with structures possessing a genetic susceptibility to complex diseases, and the functional significance of the pleiotropic MTHFR gene effect. Summarizing the results of this study, a conclusion can be made that the genetic variability analysis with emphasis on the structure of LD in human populations is a powerful tool that can make a significant contribution to such areas of biomedical science as human evolutionary biology, functional genomics, genetics of complex diseases, and pharmacogenomics.
E. M. Smekalova, O. A. Petrova, M. I. Zvereva, O. A. Dontsova
Hansenula Polymorpha TERT: A Telomerase Catalytic Subunit Isolated in Recombinant Form with Limited Reverse Transcriptase Activity
E. M. Smekalova*, O. A. Petrova, M. I. Zvereva, O. A. Dontsova
Chemistry Department, Lomonosov Moscow State University
Telomerase is a ribonucleoprotein, the main function of which is to synthesize telomeres, i.e. repetitive sequences which are localized at the ends of eukaryotic chromosomes. Telomerase maintains the stability of the genome in eukaryotic cells by replicating chromosomal ends. The structural and functional investigation of the telomerase complex is significantly restricted due to difficulties connected with the isolation of its main catalytic subunit in recombinant form. Herein, we describe a method developed for the isolation of the recombinant telomerase reverse transcriptase from thermotolerant yeast Hansenula polymorpha. A functional test performed for the isolated protein and the RNA/DNA duplex, simulating the interaction of telomerase RNA and telomere, reveals that the isolated catalytic subunit of telomerase possesses limited reverse transcriptase activity.
O. V. Bondar, D. V. Saifullina, I. I. Shakhmaeva, I. I. Mavlyutova, T. I. Abdullin
Monitoring of the Zeta Potential of Human Cells upon Reduction in Their Viability and Interaction with Polymers
O. V. Bondar*, D. V. Saifullina, I. I. Shakhmaeva, I. I. Mavlyutova, T. I. Abdullin
Kazan (Volga Region) Federal University
*E-mail: email@example.com Received 08.01.2012
The dynamic light scattering (DLS) technique was applied in order to assess the zeta potential of the plasma membrane of human cells. At pH 7.4, the cell zeta potential for different types of cells showed variations over a wide range and was equal to –19.4 ± 0.8 mV for HeLa cells and –31.8 ± 1.1 mV for erythrocytes. The difference could presumably be attributed to the differences in the biochemical composition of the cell plasma membrane. As a result of the heating of HeLa cells, the zeta potential shifted towards more negative voltages by 4.2 mV. An increase in the zeta potential correlated with an increase in the content of phosphatidylserine on the cell surface, which is considered to be an early marker of apoptosis. The DLS technique was also used to study the interactions between the cells and membranotropic polymers, such as polycations and nonionogenic Pluronic L121.
Targeted Therapy: A New Approach for the Treatment of Locally Advanced Oropharyngeal Cancer
L.Z. Velsher1,2, A.A. Kosmynin1*, M.Yu. Byakhov1,2, T.K. Duditskaya1,2, D.N. Reshetov1,2 1Moscow State Medical and Dental University 2Cancer Center JSC “RZD”, Moscow
Presented herein is a clinical study comprising 48 patients (42 men and 6 women) of working age (40–70 years), all of whom are suffering from locally advanced oropharyngeal cancer. A modern approach is applied to treat these patients, i.e., neoadjuvant targeted therapy, taking into account the biological profile of the tumor. The use of gefitinib causes an antitumor effect in 90.5% of cases as opposed to 56.5% when no drug is applied.
oropharyngeal cancers; targeted therapy; quality of life; gefitinib.
SCCHN – squamous-cell carcinoma of the head and neck; EGFR – epidermal growth factor receptor.
Cytotoxic and Immunochemical Properties of Viscumin Encapsulated in Polylactide Microparticles
E. S. Kolotova1*, S. G. Egorova1, A. A. Ramonova1, S. E. Bogorodski2, V. K. Popov2, I. I. Agapov1,3, M. P. Kirpichnikov1 1Biological Faculty, Lomonosov Moscow State University 2Institute of Laser and Information Technologies, Russian Academy of Sciences 3Shumakov Federal Research Centre of Transplantology and Artificial Organs
Biodegradable polylactide microparticles with encapsulated cytotoxic protein viscumin were obtained via the ultrasound-assisted supercritical fluid technique. The size of the microparticles was 10–50 µM, as shown by electron microscopy. The time course of viscumin release from microparticles was studied using an immunoenzyme test system with anti-viscumin monoclonal antibodies. It was found that 99.91% of the cytotoxic protein was incorporated into polymer microparticles. Only 0.08% of the initially encapsulated viscumin was released from the microparticles following incubation for 120 h in a phosphate-buffered saline at neutral pH.
Importantly, the method of ultrasonic dry supercritical fluid encapsulation failed to alter both the cytotoxic potency and the immunochemical properties of the encapsulated viscumin. Thus, this procedure can be used to generate biodegradable polylactide microparticles with encapsulated bioactive substances.
Risk of HIV Infection and Lethality Are Decreased in CCR5del32 Heterozygotes: Focus Nosocomial Infection Study and Meta-analysis
S.A.Borinskaya1, Zh.M.Kozhekbaeva1, A.V. Zalesov1,2, E.V.Olseeva3, A.R.Maksimov4, S.I. Kutsev5, M.M. Garaev6, A.V. Rubanovich1, N.K. Yankovsky1,2,7 1Vavilov Institute of General Genetics, Russian Academy of Sciences 2Moscow Institute of Physics and Technology 3Ministry of Health and Social Development of the Republic of Kalmykia 4Blood Centre of the Republic of Kalmykia 5Rostov State Medical University 6Ivanovsky Research Institute of Virology, Russian Academy of Medical Sciences 7Faculty of Biology, Lomonosov Moscow State University,
* E-mail: firstname.lastname@example.org
CCR5del32 Homozygous deletion in the chemokine receptor R5 gene provides almost complete protection to individuals against HIV infection. However, data relating to the protective effect for CCR5del32 heterozygous individuals have been contradictory. The frequency of the CCR5del32 allele in population control cohorts was compared with that of a group of children (27 Kalmyks and 50 Russians) infected by G-subtype HIV-1 in a nosocomial outbreak. The frequency of the CCR5del32 allele was shown to be lower among the infected children in comparison with that of the control group; however, the difference was small and statistically insignificant. Similar results were obtained in a number of earlier studies. The insignificance of the small differences could be a result of one of two reasons. (i) The fact that there is no protective effect of the heterozygous state, and that the phenomenon depends only on the fluctuation of allele frequencies. In this case, there would be no differences even if the infected cohort is enlarged. (ii)The protective effect of the heterozygous state is real; however, the size of the studied cohort is insufficient to demonstrate it. In order to discern between these two reasons, a meta-analysis of data from 25 published articles (a total of 5,963 HIV-infected individuals and 5,048 individuals in the control group, including the authors’ own data) was undertaken. A conclusion was drawn from the meta-analysis that the CCR5del32 allele protects individuals against the HIV infection even in a heterozygous state (OR=1.22, 95%CI=1.10–1.36). The risk of HIV infection for CCR5 wt/del32 heterozygotes was lower by at least 13% as compared to that for wild type CCR5 wt/wt homozygotes. Prior to this study, no data of the type or any conclusions had been published for Caucasians. The mortality rate in the 15 years following the infection was found to be approximately 40% lower for CCR5del32 heterozygotes in comparison with that for the wild type homozygotes in the studied group. The size of the studied group was insufficient to claim difference validity (OR=2.0; p= 0.705), even though the effect quantitatively matched the published data. The features of the meta-analysis influencing the threshold level and the statistical validity of the effects are being discussed. The level of the CCR5del32 protective effect on the chances to be infected with HIV and on the outcome of the HIV infection was assessed for various ethnic groups.
O. N. Solopova, L. P. Pozdnyakova,
N. E. Varlamov, M. N. Bokov, E. V. Morozkina, Т. А. Yagudin, P. G. Sveshnikov
Conformational Differences between Active Angiotensins and Their Inactive Precursors
O. N. Solopova1, L. P. Pozdnyakova1, N. E. Varlamov1, M. N. Bokov1, E.V. Morozkina2,Т.А. Yagudin2, P. G. Sveshnikov1 1Russian Research Center for Molecular Diagnostics and Therapy 2Bach Institute of Biochemistry, Russian Academy of Sciences
The peptide conformation in the context of a protein polypeptide chain is influenced by proximal amino acid residues. However, the mechanisms of this interference remain poorly understood. We studied the conformation of angiotensins 1, 2 and 3, which are produced naturally in a sequential fashion from a precursor protein angiotensinogen and contain an identical peptide core structure. Using the example of angiotensins 1, 2 and 3, it was shown that similar amino acid sequences may have significant conformational differences in various molecules. In order to assess the conformational changes, we developed a panel of high-affinity mouse monoclonal antibodies against angiotensins 1, 2 and 3 and studied their cross-reactivity in indirect and competitive ELISAs. It was found that the conformations of inactive angiotensin1 and the corresponding fragment of
angiotensinogen are similar; the same is true for the conformations of active angiotensins 2 and 3, whereas the conformations of homologous fragments in the active and inactive angiotensins differ significantly.
Ang1 – human angiotensin 1; Ang2 – human angiotensin 2; Ang3 – human angiotensin 3; ELISA – enzyme-linked immunosorbent assay; PAG – polyacrylamide gel; Hsp70 – heat shock protein with a molecular mass of 70 kDa; Kd– dissociation constant.
Correction of Long-Lasting Negative Effects of Neonatal Isolation in White Rats Using Semax
M. A. Volodina2, E. A. Sebentsova1, N. Yu. Glazova1, D. M. Manchenko2, L. S. Inozemtseva1, O.V. Dolotov1, L. A. Andreeva1, N. G. Levitskaya1*, A. A. Kamensky2, N. F. Myasoedov1 1Institute of Molecular Genetics, Russian Academy of Sciences 2Biological Faculty, Lomonosov Moscow State University
Adverse experience during the early postnatal period induces negative alterations in physiological and neurobiological functions, resulting in long-term disorder in animal behavior. The aim of the present work was to study the long-lasting effects of chronic neonatal stress in white rats and to estimate the possibility of their correction using Semax, an analogue of ACTH fragment (4–10). Early neonatal isolation was used as a model of early-life stress. Rat pups were separated from their mothers and littermates for 5 h daily during postnatal days 1–14. The pups of the control group were left undisturbed with the dams. Half of the rats subjected to neonatal isolation received an intranasal injection of Semax at a dose of 50 μg/kg daily, from postnatal day 15 until day 28. The other animals received intranasal vehicle injections daily at the same time points. It was shown that neonatal isolation leads to a delay in physical development, metabolic disturbances, and a decrease in the corticosterone stress response in white rats. These changes were observed during the first two months of life. Semax administration weakened the influence of neonatal isolation on the animals, body weight , reduced metabolic dysfunction, and led to an increase in stress-induced corticosterone release to the control values. So the chronic intranasal administration of Semax after termination of the neonatal isolation procedure diminishes the negative effects of neonatal stress.
chronic stress; neonatal isolation; Semax; body weight; corticosterone; rat.
Stable Expression of Recombinant Factor VIII in CHO Cells Using MethotrexateDriven Transgene Amplification
N. A. Orlova1,2#, S. V. Kovnir1,2#, I. I. Vorobiev1,2*, A.S. Yuriev2, A.G. Gabibov1, A.I.Vorobiev2 1Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences 2Hematology Research Centre Ministry of Healthcare and Social Development of the Russian Federation #Authors contributed equally to this work
*E-mail : email@example.com
Prophylaxis and treatment of inherited clotting disorder hemophilia A requires regular administration of factor VIII. Recombinant factor VIII, which is produced in CHO or BHK cells, is equivalent to the plasmaderived one and is prevalent in current clinical practice in developed countries. Development of a biosimilar recombinant FVIII requires the creation of a highly productive clonal cell line and generation of monoclonal antibodies suitable for affinity purification of the product. Methotrexate-driven transgene amplification of genetic cassettes that code full-length and truncated variants of FVIII under the control of the CMV promoter was studied. It was shown that the expression level of the truncated variant of FVIII is 6.5 times higher than that
of the full-length molecule. The transgene amplification procedure was sufficient for a twofold increase of the expression level in the transfected cells pool and subsequent selection of the clonal line, stably producing truncated FVIII at the level of 0.52 IU/ml during cultivation in a chemically defined protein-free culture medium. Four generated mouse monoclonal antibodies toward the heavy chain of FVIII were found suitable for binding the truncated variant of FVIII directly from the conditioned medium and elution of the FVIII with a more than 85% yield and normal pro-coagulant activity. The producer cell line and monoclonal antibodies obtained are sufficient for the development of upstream and downstream processes of biosimilar FVIII production. Generation of more productive cell lines by the use of stronger, nonviral promoters and shorter cDNA of FVIII will be the subject of further studies.
Physicochemical Biology: Conquered Boundaries and New Horizons
Institute of Chemical Biology and Fundamental Medicine, Siberian Branch, Russian Academy of Sciences, prosp. Akademika Lavrent’eva, 8, 630090, Novosibirsk, Russia
In this paper, we shall consider the main evolutionary stages that occurred within the field of physicochemical biology during the 20th century, following the determination of the tertiary structure of DNA by Watson and Crick and the subsequent successes in the X-ray structural analysis of biopolymers. The authors’ deas on the pre-emptive problems and the methods used in physicochemical biology in the 21st century are also presented, including an investigation of the dynamics of biochemical processes, studies of the functions of unstructured proteins, as well as single-molecule investigations of enzymatic processes and of biopolymer tertiary structure formation.
DNA structure; enzyme active sites; unstructured proteins; dynamics of biochemical processes; single molecule studies of enzymatic processes and biopolymer tertiary structure formation.
Telomere Lengthening and Other Functions of Telomerase
M.P. Rubtsova1,2*, D.P. Vasilkova1, А.N. Malyavko1, Yu.V.Naraikina3, M.I. Zvereva1,2, О.А. Dontsova1,2 1Lomonosov Moscow State University, Chemistry Department, 2Belozersky Institute of Physicochemical Biology, Lomonosov Moscow State University 3Lomonosov Moscow State University, Faculty of Bioengineering and Bioinformatics
Telomerase is an enzyme that maintains the length of the telomere. The telomere length specifies the number of divisions a cell can undergo before it finally dies (i.e. the proliferative potential of cells). For example, telomerase is activated in embryonic cell lines and the telomere length is maintained at a constant level; therefore, these cells have an unlimited fission potential. Stem cells are characterized by a lower telomerase activity, which enables only partial compensation for the shortening of telomeres. Somatic cells are usually characterized
by the absence of telomerase activity. Telomere shortening leads to the attainment of the Hayflick limit, the transition of cells to a state of senescence. The cells subsequently enter a state of crisis, accompanied by massive cell death. The surviving cells become cancer cells, which are capable both of dividing indefinitely and maintaining telomere length (usually with the aid of telomerase). Telomerase is a reverse transcriptase. It consists of two major components: telomerase RNA (TER) and reverse transcriptase (TERT). TER is a non-coding RNA, and it
contains the region which serves as a template for telomere synthesis. An increasing number of articles focusing on the alternative functions of telomerase components have recently started appearing. The present review summarizes data on the structure, biogenesis, and functions of telomerase.
telomerase; reverse transcriptase; telomeres; mitochondria; DNA damage; gene expression.
TER – telomerase RNA; hTR – human telomerase RNA; TERT – telomerase reverse transcriptase.
N. A. Orlova, S. V. Kovnir, I. I. Vorobiev, A.G.Gabibov
Coagulation Factor IX for Hemophilia B Therapy
N. A. Orlova1,2, S. V. Kovnir1,2, I. I. Vorobiev1,2*, A.G.Gabibov1 1Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences 2Hematology Research Centre, Ministry of Healthcare and Social Development of the Russian Federation
Factor IX is a zymogen enzyme of the blood coagulation cascade. Inherited absence or deficit of the IX functional factor causes bleeding disorder hemophilia B, which requires constant protein replacement therapy. Reviewed herein are the current state in the manufacturing of FIX, improved variants of the recombinant protein for therapy, transgenic organisms for obtaining FIX, and the advances in the gene therapy of hemophilia B.
сoagulation factor IX; hemophilia B; heterologous protein expression systems
R.M. Barsova, B.V. Titov, N.A. Matveeva, A.V. Favorov, T.S. Sukhinina, R.M. Shahnovich2, M.Ia. Ruda, O.O. Favorova
Contribution of the TGFB1 Gene to Myocardial Infarction Susceptibility
R.M. Barsova1,2, B.V. Titov1,2, N.A. Matveeva1,2, A.V. Favorov3,4, T.S. Sukhinina2, R.M. Shahnovich2, M.Ia. Ruda2, O.O. Favorova1,2
1Pirogov Russian National Research Medical University , Moscow
2Russian Cardiology Scientific and Production Center, Moscow
3Vavilov Institute of General Genetics, Russian Academy of Science, Moscow
4Oncology Biostatistics and Bioinformatics, Johns Hopkins School of Medicine, Baltimore, MD 21205, US
Carriage frequencies of alleles and genotypes of the TGFB1 gene polymorphous loci –509C>T (rs1800469), 869T>C (rs1982073), 915G>C (rs1800471), which affect the level of cytokine TGF-β1 production, were analyzed in the patients of Russian ethnic descent with myocardial infarction (MI) (406 cases) and in the control group of the same ethnic descent (198 controls). Significant association with MI was observed in carriage frequencies of the allele TGFB1*–509T (p=0.046, OR =1.45, 95% CI: 1.02-2.06), genotypes TGFB1*869T/T (p=0.0024, OR =1.75, 95% CI: 1.22-2.51), and TGFB1*915G/G (p=0.048, OR=1.76, 95% CI: 1.05-2.97). Linkage disequilibrium analysis for these SNPs has shown that the associations revealed can be considered to be independent. A complex analysis of MI association with combinations of alleles/genotypes of said SNPs indicates their cumulative effect. An analysis of susceptibility to early-onset MI (? 50 years old) revealed a positive association of the allele TGFB1*–509T (p=0.002, OR=2.24, 95% CI: 1.35-3.71) and genotype TGFB1*869T/T (p=0.008, OR=1.93, 95% CI: 1.18-3.15), as well as their additivity. An analysis of susceptibility to recurrent MI revealed an association of the genotype TGFB1*–509T/T (p=0.0078, OR=2.60, 95% CI: 1.28-5.28). The results obtained indicate the important role of the TGFB1 gene in susceptibility to MI, including early-onset and recurrent MI, in Russians.
Construction of a Full-Atomic Mechanistic Model of Human Apurinic/Apyrimidinic Endonuclease APE1 for Virtual Screening of Novel Inhibitors
I.G. Khaliullin1, D.K. Nilov1,2, I.V. Shapovalova2, V.K. Svedas1,2* 1Belozersky Institute of Physicochemical Biology, Lomonosov Moscow State University 2Lomonosov Moscow State University, Faculty of Bioengineering and Bioinformatics
A full-atomic molecular model of human apurinic/apyrimidinic endonuclease APE1, an important enzyme in the DNA repair system, has been constructed. The research consisted of hybrid quantum mechanics/molecular mechanics modeling of the enzyme-substrate interactions, as well as calculations of the ionization states of the amino acid residues of the active site of the enzyme. The choice of the APE1 mechanism with an Asp210 residue as a proton acceptor was validated by means of a generalization of modeling and experimental data. Interactions were revealed in the active site that are of greatest significance for binding the substrate and
potential APE1 inhibitors (potential co-drugs of interest in the chemo- and radiotherapy of oncological diseases).
Yu. A. Morozov, L. M. Khromykh, I. I. Dementieva, M. A. Charnaia1, N. L. Kulikova, D.B. Kazansky
Recombinant Human Cyclophilin A in vitro Inhibits the Formation of Fibrin Clot
Yu. A. Morozov1*, L. M. Khromykh2, I. I. Dementieva1, M. A. Charnaia1, N. L. Kulikova3, D.B. Kazansky2 1Petrovsky Russian Research Center of Surgery, Russian Academy of Medical Sciences 2Carcinogenesis Institute, Blokhin Cancer Research Center 3Institute of Immunological Engineering
The chemotactic properties of cyclophilin A are well-known. There exists however a poor level of understanding regarding the hemostatic effects of this protein. Herein it is shown that recombinant human cyclophilin A (rhСyA), in contrast to the granulocyte colony-stimulating factor, is capable of inhibiting in vitro the formation of a fibrin clot, thereby violating the spatial dynamics of clot growth; this effect is transient and dose-independent. Furthermore, the hypothesis that the conformational changes in the thrombin–rhCyA complex may mediate the anticoagulant effect of rhCyA on the autowave processes of blood clotting is postulated.
recombinant human cyclophilin A; spatial dynamics of clot growth; anticoagulant activity.
rhCyA – recombinant human cyclophilin A; DCG – delay of clot growth, min; IGR – initial growth rate, min; SSGR – steady-state growth rate, min; CS-30 – clot size after 30-minute growth, μm; CD – the clot density; G-CSF – granulocyte colony-stimulating factor.
Development of Chlamydial Type III Secretion System Inhibitors for Suppression of Acute and Chronic Forms of Chlamydial Infection
N.A. Zigangirova, E.S. Zayakin*, L.N. Kapotina, E.A. Kost, L.V. Didenko, D.Y. Davydova, J.P. Rumyanceva, A.L. Gintsburg
Gamaleya Research Institute of Epidemiology and Microbiology
The Type III secretion system (T3SS) is currently considered to be one of the main pathogenicity factors in Gram-negative bacteria, which exhibit different types of parasitizing activity. The presence of this structure is essential for the development of an acute infection; the chronicity of the infection is fundamentally dependent upon its functioning. In this regard, T3TS is one of the most promising targets for the development of broad-spectrum antimicrobial drugs that do not develop resistance and are efficacious for the acute and chronic forms of infection. The mechanism of action in drug development is based on the specific inhibition of T3SS,
which should interrupt the infectious process, thereby enabling the immune system to eliminate the pathogen. As a result of pilot screening using specific cellular and bacterial tests, followed by chemical optimization and detailed characterization of the biological activity, a new class of chlamydial T3SS inhibitors was obtained. The selected compounds have obvious advantages over the currently available inhibitors of T3SS pathogens thanks to the high inhibitory activity of these compounds with minimal damaging effects on eukaryotic cells. Preclinical trials of the selected inhibitors are currently under way.
thiohydrazones; thiohydrazides; thiadiazines; type III secretion system; citotoxicity; Chlamydia; inhibitors; microscopy; electron microscopy; morphology.
T3SS – type III secretion system; MOI – multiplicity of infection; МОМР – major outer membrane protein of Chlamydia; LPS – lipopolysaccharide; EB – elementary bodies; RB – reticular cells; IFU – inclusion forming units.
O. S. Petrakova1, E. S. Chernioglo1, V. V. Terskikh1, E. N. Kalistratova2, A. V. Vasiliev1,2
The Use of Cellular Technologies in Treatment of Liver Pathologies
Koltzov Institute of Developmental Biology, Russian Academy of Sciences
Cell techniques find increasing application in modern clinical practice. The II and III phases of clinical trials are already under way for various cellular products used for the restoration of the functions of the cornea, larynx, skin, etc. However, the obtainment of functional cell types specific to different organs and tissues still remains a subject of laboratory research. Liver is one of the most important organs; the problems and prospects of cellular therapy for liver pathologies are currently being actively studied.
Cellular therapy of liver pathologies is a complex multistage process requiring a thorough understanding of the molecular mechanisms occurring
in liver cells during differentiation and regeneration. An analysis of the current cellular therapy for liver pathologies is presented, the use of various cell types is described, the main molecular mechanisms of hepatocyte differentiation are analyzed, and the challenges and prospects of cell therapy for liver disorders are discussed in this review.
S. N. Lomin, D.M. Krivosheev, M. Yu. Steklov, D. I. Osolodkin, G. A. Romanov
Receptor Properties and Features of Cytokinin Signaling
Receptor Properties and Features of Cytokinin Signaling
Cytokinins belong to one of the most important and well-known classes of plant hormones. Discovered over half a century ago, cytokinins have retained the attention of researchers due to the variety of the effects they have on the growth and development of vegetable organisms, their participation in a plant adaptation to external conditions, and the potential to be used in biotechnology, agriculture, medicine and even cosmetics.
The molecular mechanism by which cytokinins function remained unknown for a long time. Things started to change only in the 21st century, after the discovery of the receptors for these phytohormones. It appeared that plants found ways to adapt a two-component signal transduction system borrowed from prokaryotic organisms for cytokinin signalling. This review covers the recent advances in research of the molecular basis for the perception and transduction of the cytokinin signal. Emphasis is placed on cytokinin receptors, their domain and three-dimensional structures, subcellular localization, signalling activity, effect of mutations, ligand-binding properties, and phylogeny.
cytokinins; receptors; sensor histidine kinases; two-component systems; signal transduction.
HK – histidine kinase; HP – phosphotransmitter; RR – response regulator; ER – endoplasmic reticulum.
Lipopolysaccharide of Yersinia pestis, the Cause of Plague: Structure, Genetics, Biological Properties
Lipopolysaccharide of Yersinia pestis, the Cause of Plague: Structure, Genetics, Biological Properties
The present review summarizes data pertaining to the composition and structure of the carbohydrate moiety (core oligosaccharide) and lipid component (lipid A) of the various forms of lipopolysaccharide (LPS), one of the major pathogenicity factors of Yersinia pestis, the cause of plague. The review addresses the functions and the biological significance of genes for the biosynthesis of LPS, as well as the biological properties of LPS in strains from various intraspecies groups of Y. pestis and their mutants, including the contribution of LPS to the resistance of bacteria to factors of the innate immunity of both insect-vectors and mammal-hosts. Special attention is paid to temperature-dependent variations in the LPS structure, their genetic control and roles in the pathogenesis of plague.
The evolutionary aspect is considered based on a comparison of the structure and genetics of the LPS of Y. pestis and other enteric bacteria, including other Yersinia species. The prospects of development of live plague vaccines created on the basis of Y. pestis strains with the genetically modified LPS are discussed.
A Polygenic Approach to the Study of Polygenic Diseases
Scientific Center of Russian Federation Research Institute for Genetics and Selection of Industrial
Polygenic diseases are caused by the joint contribution of a number of independently acting or interacting polymorphic genes; the individual contribution of each gene may be small or even unnoticeable. The carriage of certain combinations of genes can determine the occurrence of clinically heterogeneous forms of the disease and treatment efficacy. This review describes the approaches used in a polygenic analysis of data in medical genomics, in particular, pharmacogenomics, aimed at identifying the cumulative effect of genes.
This effect may result from the summation of gains of different genes or be caused by the epistatic interaction between the genes. Both cases are undoubtedly of great interest in investigating the nature of polygenic diseases. The means that allow one to discriminate between these two possibilities are discussed. The methods for searching for combinations of alleles of different genes associated with the polygenic phenotypic traits of the disease, as well as the
methods for presenting and validating the results, are described and compared. An attempt is made to evaluate the applicability of the existing methods to an epistasis analysis. The results obtained by the authors using the APSampler software are described and summarized.
medical genomics; pharmacogenomics; polygenic analysis; epistasis
CDCV – common disease / common variant; CDRV – common disease / rare variant; CI – confidence interval; CMC – combined multivariate and collapsing; FDR – false discovery rate; GWAS – genome-wide association study; MCMC – Markov Chain Monte Carlo; MDR – multifactor dimensionality reduction; MS – multiple sclerosis; IS – ischemic stroke; OR – odds ratio; ORR – odds ratios ratio; RR – relative risk; SF – synergy factor; TDT – transmission disequilibrium test.
Cardiological Biopharmaceuticals in the Conception of Drug Targeting Delivery: Practical Results and Research Perspectives
Institute of Experimental Cardiology, Russian Cardiology Research and Production Complex
The results of the clinical use of thrombolytic and antithrombotic preparations developed on the basis of protein conjugates obtained within the framework of the conception of drug targeting delivery in the organism are considered. A decrease has been noted in the number of biomedical projects focused on these derivatives as a result of various factors: the significant depletion of financial and organizational funds, the saturation of the pharmaceutical market with preparations of this kind, and the appearance of original means for interventional procedures.
Factors that actively facilitate the conspicuous potentiation of the efficacy of bioconjugates were revealed: the biomedical testing of protein domains and their selected combinations, the optimization of molecular sizes for the bioconjugates obtained, the density of target localization, the application of cell adhesion molecules as targets, and the application of connected enzyme activities. Enzyme antioxidants and the opportunity for further elaboration of the drug delivery conception via the elucidation and formation of therapeutic targets for effective drug reactions by means of pharmacological pre- and postconditioning of myocardium arouse significant interest.
drug targeting delivery; protein bioconjugates; thrombolytics; antithrombotic agents; molecular size of bioconjugates; density of molecular targets; enzyme connected antioxidants; cell adhesion molecules; pharmacological pre- and post-conditioning of myocardium.
A. I. Tuhvatulin, E. V. Sysolyatina, D. V. Scheblyakov, D. Yu. Logunov, M. M. Vasiliev, M. A. Yurova, M. A. Danilova, O. F. Petrov, B. S. Naroditsky, G. E. Morfill, A. I. Grigoriev, V. E. Fortov, A. L. Gintsburg, S. A. Ermolaeva*
Non-thermal Plasma Causes p53-Dependent Apoptosis in Human Colon Carcinoma Cells
Non-thermal plasma (NTP) consists of a huge amount of biologically active particles, whereas its temperature is close to ambient. This combination allows one to use NTP as a perspective tool for solving different biomedical tasks, including antitumor therapy. The treatment of tumor cells with NTP caused dose-dependent effects, such as growth arrest and apoptosis. However, while the outcome of NTP treatment has been established, the molecular mechanisms of the interaction between NTP and eukaryotic cells have not been thoroughly studied thus far. In this work, the mechanisms and the type of death of human colon carcinoma HCT 116 cells upon application of non-thermal argon plasma were studied.
The effect of NTP on the major stress-activated protein p53 was investigated. The results demonstrate that the viability of HCT116 cells upon plasma treatment is dependent on the functional p53 protein. NTP treatment caused an increase in the intracellular concentration of p53 and the induction of the p53-controlled regulon. The p53-dependent accumulation of active proapoptotic caspase-3 was shown in NTP-treated cells. The study was the first to demonstrate that treatment of human colon carcinoma cells with NTP results in p53-dependent apoptosis. The results obtained contribute to our understanding of the applicability of NTP in antitumor therapy.
M. A. Savitskaya*, M. S. Vildanova, O. P. Kisurina-Evgenieva, E.A. Smirnova, G. E. Onischenko
Mitochondrial Pathway of ?-Tocopheryl Succinate-Induced Apoptosis in Human Epidermoid Carcinoma A431 Cells
Vitamin E derivatives are known to act as agents exhibiting cytotoxity against tumor cells. The effect of vitamin E succinate on human epidermoid carcinoma cell line A431 was investigated in this study using live imaging, immunocytochemistry, and transmission electron microscopy. α-Tocopheryl succinate-induced apoptotic cell death in A431 cells was shown to be both dose- and time-dependent.
The hyperproduction of reactive oxygen species, changes in size, shape and ultrastructural characteristics of mitochondria followed by the release of cytochrome c from mitochondria to cytosol were observed. These results suggest that α-tocopheryl succinate induces apoptosis that occurs via the mitochondrial pathway. Mitochondria are shown to be crucial targets in α-tocopheryl succinate-induced caspase-dependent cell death in human carcinoma A431 cells.
α-tocopheryl succinate; apoptosis; mitochondrial pathway; ROS; cytochrome c
α-TS – α-tocopheryl succinate; ROS – reactive oxygen species; AI – apoptotic index
N. I. Grineva*, E. A. Duchovenskay, A. M. Timofeev, T. V. Akhlynina, L. P. Gerasimova, T. E. Manakova., T. V. Borovkova, D. A. Schmarov, N. G. Sarycheva, N. M. Naydenova, A .R. Gavrichkova, L. Y. Kolosova, T. I. Kolosheynova, L. G. Kovaleva
Gene Expression upon Proliferation and Differentiation of Hematopoietic Cells with Ph Chromosome ex vivo
The genes p53, mdm2, p21, c-myc, bcr/abl, bcr, bcl2, bax, and gapdh participate in the regulation of cell proliferation and differentiation, apoptosis and cell distribution for the cell cycle ex vivo in the Ph+cells of chronic myeloid leukemia containing the Ph chromosome and bcr/abl oncogene. Expression of these genes correlates with regulation of cell proliferation and differentiation by alternating proliferation and maturation stages for three main Ph+cell types that occur under chronic myeloid leukemia. The p53, p21, mdm2, and gapdh genes overexpress in active proliferating myeloid cells in the cell cycle S+ G2/M phases and when the phases are coincident with the proliferation stage.
Expression of these genes decreases to a considerable level under alternation of the Ph+cell proliferation and maturation stages and whenever the expression is greatly diminished under significant neutrophil accumulation and especially under repeated alternation of the stages. In the course of neutrophil maturation, gene expression levels decrease in the range of gapdh > actin > c-myc, bcr/abl,p21 > p53 > bcl2 > bax. The expression levels of these genes in neutrophils are lower than those in myelocytes and lower by an order of magnitude than that in the cells with a prolonged proliferation stage. The Bcr/abl expression gene under prolonged maturation and neutrophil accumulation is inhibited; however it is enhanced by 2–3 times for the proliferation stage with myelocyte accumulation. Minimal bcr/abl expression is observed under overexpression of p53, mdm2, p21, c-myc, as well as under cell maximum at the S and G2/M phases. Bcr/abl overexpression is observed under low expression of the p53, p21, mdm2 genes.
In the Ph+ cells with a high P/D efficiency index (5–20), overexpression of the genes in the range of bcr> gapdh>bcr/abl, as well as a decreased expression of the p53, bcl2, mdm2, p21<< gapdh genes is observed for Ph+ cells from the CML blast crisis and CML acceleration phase. Low control of cell proliferation and cell cycle by gene-regulators presumably promotes bcr/abl overexpression and activаtes the production of bcr/abl+ cells. Apoptosis in the Ph+ cells is induced by expression of the bax > bcl2, р53, p21, c-myc and gapdh genes. The blocking of Ph+ cell apoptosis, neutrophil accumulation, and decrease in the expression of the p53, mdm2 and p21, c-myc, bcr/abl genes occur at the maturation stage.
gene expression; regulation of cell proliferation and differentiation; cells containing Ph chromosome; chronic myeloid leukemia; RT-PCR, cell cycle; apoptosis.
This review covers the problems encountered in the construction and production of new recombinant influenza vaccines. New approaches to the development of influenza vaccines are investigated; they include reverse genetics methods, production of virus-like particles, and DNA- and viral vector-based vaccines. Such approaches as the delivery of foreign genes by DNA- and viral vector-based vaccines can preserve the native structure of antigens. Adenoviral vectors are a promising gene-delivery platform for a variety of genetic vaccines. Adenoviruses can efficiently penetrate the human organism through mucosal epithelium, thus providing long-term antigen persistence and induction of the innate immune response. This review provides an overview of the practicability of the production of new recombinant influenza cross-protective vaccines on the basis of adenoviral vectors expressing hemagglutinin genes of different influenza strains.
Recombinant vaccine; influenza; immunization.
WHO – World Health Organization; DNA – deoxyribonucleic acid; HA – hemagglutinin; NA – neuraminidase; VLP – virus-like particles; RNA – ribonucleic acid; NP – nucleoprotein; DC – dendritic cell; APC – antigen-presenting cell; Ad – adenovirus; NK – natural killers.
S. P. Medvedev , E. A. Pokushalov, S. M. Zakian
Epigenetics of Pluripotent Cells
Department of Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences, Prospekt Lavrentyeva, 10, Novosibirsk, Russia, 630090
Meshalkin Novosibirsk State Research Institute of Circulation Pathology, Rechkunovskaja Str., 15, Novosibirsk, Russia, 630055
Institute of Chemical Biology and Fundamental Medicine, Siberian Branch, Russian Academy of Sciences, Prospekt Lavrentyeva, 8, Novosibirsk, Russia, 630090
Pluripotency is maintained by a complex system that includes the genetic and epigenetic levels. Recent studies have shown that the genetic level (transcription factors, signal pathways, and microRNAs) closely interacts with the enzymes and other specific proteins that participate in the formation of the chromatin structure. The interaction between the two systems results in the unique chromatin state observed in pluripotent cells. In this review, the epigenetic features of embryonic stem cells and induced pluripotent stem cells are considered. Special attention is paid to the interplay of the transcription factors OCT4, SOX2, and NANOG with the Polycomb group proteins and other molecules involved in the regulation of the chromatin structure. The participation of the transcription factors of the pluripotency system in the inactivation of the X chromosome is discussed. In addition, the epigenetic events taking place during reprogramming of somatic cells to the pluripotent state and the problem of "epigenetic memory" are considered.
9-(4’-Phosphonomethoxy-2’-cyclopenten-1’-yl)hypoxanthine and 9-(4’-phosphonomethoxy-2’,3’-
dihydroxycyclopenten-1’-yl)hypoxanthine were synthesized as isosteric carbocyclic analogues of inosine-5’-monophosphate. The synthesized compounds were shown to be capable of inhibiting the activity of human type II inosine-5′-monophosphate dehydrogenase (IMPDH II) (IC50 = 500 μM) and to have no significant effects on
the growth of Mycobacterium tuberculosis.
Carbocyclic nucleosides; competitive inhibition; inosine-5’-monophosphate; human IMPDH II, Mycobacterium tuberculosis.
Yu. M. Yevdokimov, V. I. Salyanov, E. I. Katz, S. G. Skuridin
Gold Nanoparticle Clusters in Quasinematic Layers of Liquid-Crystalline Dispersion Particles of Double-Stranded Nucleic Acids
Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilova Str., 32, Moscow, Russia, 119991
Landau Institute for Theoretical Physics, Russian Academy of Sciences, Kosygina Str. 2, Moscow, Russia, 119334
The interaction between gold nanoparticles and particles of cholesteric liquid-crystalline dispersions
formed by double-stranded DNA and poly(I)Чpoly(C) molecules is considered. It is shown that small-sized (~ 2 nm) gold nanoparticles induce two different structural processes. First, they facilitate the reorganization of the spatial cholesteric structure of the particles into a nematic one. This process is accompanied by a fast decrease in the amplitude of an abnormal band in the CD spectrum. Second, they induce cluster formation in a “free space” between neighboring nucleic acid molecules fixed in the structure of the quasinematic layers of liquidcrystalline particles. This process is accompanied by slow development of the surface plasmon resonance band in the visible region of the absorption spectrum. Various factors influencing these processes are outlined. Some
assumptions concerning the possible mechanism(s) of fixation of gold nanoparticles between the neighboring double-stranded nucleic acid molecules in quasinematic layers are formulated.
DNA; poly(I)Чpoly(C); liquid-crystalline dispersions of nucleic acids; gold nanoparticles; circular dichroism; absorption spectroscopy; abnormal optical activity; surface plasmon resonance; structure of biopolymer lyotropic liquid crystals; cytotoxicity of nanoparticles.
DAU – daunomycin; CD – circular dichroism; Au nanoparticles (nano-Au) – gold nanoparticles; SPR – surface plasmon resonance; PEG – poly(ethylene glycol); UV region – ultraviolet region; CLCD – cholesteric
G-protein-coupled receptors (GPCR) constitute one of the biggest families of membrane proteins.
In spite of the fact that they are highly relevant to pharmacy, they have remained poorly explored. One of the main bottlenecks encountered in structural-functional studies of GPCRs is the difficulty to produce sufficient amounts of the proteins. Cell-free systems based on bacterial extracts from E. coli cells attract much attention as an effective tool for recombinant production of membrane proteins. GPCR production in bacterial cell-free expression systems is often inefficient because of the problems associated with the low efficiency of the translation initiation process. This problem could be resolved if GPCRs were expressed in the form of hybrid proteins with N-terminal polypeptide fusion tags. In the present work, three new N-terminal fusion tags are proposed for cellfree production of the human β2-adrenergic receptor, human M1 muscarinic acetylcholine receptor, and human somatostatin receptor type 5. It is demonstrated that the application of an N-terminal fragment (6 a.a.) of bacteriorhodopsin from Exiguobacterium sibiricum (ESR-tag), N-terminal fragment (16 а.о.) of RNAse A (S-tag), and Mistic protein from B. subtilis allows to increase the CF synthesis of the target GPCRs by 5–38 times, resulting in yields of 0.6–3.8 mg from 1 ml of the reaction mixture, which is sufficient for structural-functional studies
a.a. – amino acid residue; β2AR – human β2-adrenergic receptor; CF system – cell-free expression
system; ESR – bacteriorhodopsin from Exiguobacterium sibiricum; ESR-tag – 6 a.a. N-terminal fragment of the ESR; FM – feeding mixture; GPCR – G-protein-coupled receptor; M1-mAChR – human muscarinic acetylcholine receptor M1; MP – membrane protein; RM – reaction mixture; SSTR5 – human somatostatin receptor type 5;
S-tag – 16 a.a. N-terminal fragment of ribonuclease A; T7-tag – 11 a.a. N-terminal fragment of the leader peptide of the protein 10 of the bacteriophage T7; TM – transmembrane; TRX – thioredoxin from Escherichia coli.
O. S. Petrakova, V. V. Ashapkin, E. A. Voroteliak, E. Y. Bragin, V. Y. Shtratnikova, E. S. Chernioglo, Y. V. Sukhanov, V. V. Terskikh, A. V. Vasiliev
Effect of 3D Cultivation Conditions on the Differentiation of Endodermal Cells
Koltzov Institute of Developmental Biology, Russian Academy of Sciences, Vavilova Str. 26, Moscow, Russia, 119334
Lomonosov Moscow State University, Faculty of Biology, Leninskie Gory 1/12, Moscow, Russia, 119991
Belozersky Institute, Moscow State University, Leninskie Gory, 1/40, Moscow, Russia, 119991
Center of Innovation and Technology of Biologically Active Compounds and Their Applications, Russian Academy of Sciences, Gubkina Str. 3/2, Moscow, Russia, 117312
Cellular therapy of endodermal organs is one of the most important issues in modern cellular biology and biotechnology. One of the most promising directions in this field is the study of the transdifferentiation abilities of cells within the same germ layer. A method for an in vitro investigation of the cell differentiation potential (the cell culture in a three-dimensional matrix) is described in this article. Cell cultures of postnatal salivary gland cells and postnatal liver progenitor cells were obtained; their comparative analysis under 2D and 3D cultivation conditions was carried out. Both cell types have high proliferative abilities and can be cultivated for more than 20 passages. Under 2D cultivation conditions, the cells remain in an undifferentiated state. Under 3D conditions, they undergo differentiation, which was confirmed by a lower cell proliferation and by an increase in the differentiation marker expression. Salivary gland cells can undergo hepatic and pancreatic differentiation under 3D cultivation conditions. Liver progenitor cells also acquire a pancreatic differentiation capability under conditions of 3D cultivation. Thus, postnatal salivary gland cells exhibit a considerable differentiation potential within the endodermal germ layer and can be used as a promising source of endodermal cells for the cellular therapy of liver pathologies. Cultivation of cells under 3D conditions is a useful model for the in vitro analysis of the cell differentiation potential.
For prokaryotes in vitro, 16S rRNA and 20 ribosomal proteins are capable of hierarchical self- assembly yielding a 30S ribosomal subunit. The self-assembly is initiated by interactions between 16S rRNA and three key ribosomal proteins: S4, S8, and S7. These proteins also have a regulatory function in the translation of their polycistronic operons recognizing a specific region of mRNA. Therefore, studying the RNA–protein interactions within binary complexes is obligatory for understanding ribosome biogenesis. The non-conventional RNA–protein contact within the binary complex of recombinant ribosomal protein S7 and its 16S rRNA binding site (236 nucleotides) was identified.
UV–induced RNA–protein cross-links revealed that S7 cross-links to nucleotide U1321 of 16S rRNA. The careful consideration of the published RNA– protein cross-links for protein S7 within the 30S subunit and their correlation with the X-ray data for the 30S subunit have been performed. The RNA – protein cross–link within the binary complex identified in this study is not the same as the previously found cross-links for a subunit both in a solution, and in acrystal. The structure of the binary RNA–protein complex formed at the initial steps of self-assembly of the small subunit appears to be rearranged during the formation of the final structure of the subunit.
ribosome; initiation; self-assembly; ribosomal protein S7; UV– induced cross-linking.
XRD – X-ray diffraction analysis; RNP – ribonucleoprotein; EcoS7, TthS7, BstS7 –proteins S7 isolated from E. coli, T. thermophilus and B. stearothermophilus, respectively; Tth30S and Eco30S – small ribosomal subunits isolated from T. thermophilus and E. coli, respectively.
ABSTRACT This review deals with the application of the pulsed electron double resonance (PELDOR) method to studies of spin-labeled DNA and RNA with complicated spatial structures, such as tetramers, aptamers, riboswitches, and three- and four-way junctions. The use of this method for studying DNA damage sites is also described.
KEYWORDS pulsed electron double resonance (PELDOR); spin-labels; DNA; RNA; oligonucleotides
ABSTRACT During the past two decades, there have been numerous attempts at using animals in order to produce recombinant human proteins and monoclonal antibodies. However, it is only recently that the first two therapeutic agents isolated from the milk of transgenic animals, C1 inhibitor (Ruconest) and antithrombin (ATryn), appeared on the market. This inspires hope that a considerable number of new recombinant proteins created using such technology could become available for practical use in the near future. In this review, the methods applied to produce transgenic animals are described and the advantages and drawbacks related to their use for producing recombinant human proteins and monoclonal antibodies are discussed.
KEYWORDS bioreactor; milk protein production; production of monoclonal antibodies; recombinant proteins; therapeutic drugs; transgenic animals
ABBREVIATIONS mAb – monoclonal antibodies; MI – intranuclear microinjection of DNA; NT – nuclear transfer; RP – recombinant protein; RHA – recombinant human albumin; rhBChE – recombinant human butyrylcholinesterase; TA – transgenic animal; FDA – United States Food and Drug Administration; EMEA – European Medicines Evaluation Agency; CHO cells – Chinese hamster ovary cells; ES cells – embryonic stem cells; UTR – untranslated region of a gene
ABSTRACT The review covers the analysis of our own and published data pertaining to population and genetic consequences in various mammalian species under conditions of high levels of ionizing radiation as a result of the Chernobyl accident. The findings indicate that these conditions have promoted the reproduction of heterozygotes in polyloci spectra of molecular genetic markers and animals with a relatively increased stability of the chromosomal apparatus. The prospects of using the reproductive “success” of the carriers of these characteristics as an integral indicator of the selective influence of environmental stress factors are discussed.
ABSTRACT Human immunodeficiency virus type 1 integrase is one of the most attractive targets for the development of anti-HIV-1 inhibitors. The capacity of a series of 2,1,3-benzoxadiazoles (benzofurazans) and their N-oxides (benzofuroxans) selected using the PASS software to inhibit the catalytic activity of HIV-1 integrase was studied in the present work. Only the nitro-derivatives of these compounds were found to display inhibitory activity. The study of the mechanism of inhibition by nitro-benzofurazans/benzofuroxans showed that they impede the substrate DNA binding at the integrase active site. These inhibitors were also active against integrase mutants resistant to raltegravir, which is the first HIV-1 integrase inhibitor approved for clinical use. The comparison of computer-aided estimations of the pharmacodynamic and pharmacokinetic properties of the compounds studied and raltegravir led us to conclude that these compounds show promise and need to be further studied as potential HIV-1 integrase inhibitors.
ABBREVIATIONS ADME – absorption, distribution, metabolism, and excretion; AIDS – acquired immunodeficiency syndrome; BFX – benzofuroxan; BFZ – benzofurozan; HIV-1 – human immunodeficiency virus type 1; IN – integrase; IC50 – inhibitor concentration at which the enzyme activity is suppressed by 50 %; IC95 – inhibitor concentration at which the enzyme activity is suppressed by 95 %; PASS – Prediction of Activity Spectra for Substances software program; QikProp – ADME prediction software program
ABSTRACT Butyrylcholinesterase (BChE) is a serine hydrolase (EC 184.108.40.206) which can be found in most animal tissues. This enzyme has a broad spectrum of efficacy against organophosphorus compounds, which makes it a prime candidate for the role of stoichiometric bioscavenger. Development of a new-age DNA-encoded bioscavenger is a vival task. Several transgenic expression systems of human BChE were developed over the past 20 years; however, none of them has been shown to make economic sense or has been approved for administration to humans. In this study, a CHO-based expression system was redesigned, resulting in a significant increase in the production level of functional recombinant human butyrylcholinesterase as compared to the hitherto existing systems. The recombinant enzyme was characterized with Elman and ELISA methods.
KEYWORDS bioscavenger; butyrylcholinesterase; CHO cell line; recombinant protein; оrganophosphorus toxins
ABBREVIATIONS a.a.r. – amino acid residue; BChE – butyrylcholinesterase; PAGE – polyacrylamide gel electrophoresis; OPT – organophosphate toxin; CHO – Chinese hamster ovary cells; DMEM – Dulbecco’s Modified Eagle Medium
ABSTRACT Human mitochondrial ribosomal protein MRPS18-2 (S18-2) is encoded by a cellular gene that is located on the human chromosome 6p21.3. We discovered that overexpression of the S18-2 protein led to immortalization and de-differentiation of primary rat embryonic fibroblasts. Cells showed anchorage-independent growth pattern. Moreover, pathways characteristic for rapidly proliferating cells were upregulated then. It is possible that the S18-2 overexpression induced disturbance in cell cycle regulation. We found that overexpression of S18-2 protein in human cancer cell lines led to an appearance of multinucleated cells in the selected clones.
KEYWORDS Mitochondrial ribosomal protein S18-2 (MRPS18-2), multinucleated cells, cancer cell line, cell cycle, RB binding protein
ABSTRACT The Bacillus cereus group consists of closely related species of bacteria and is of interest to researchers due to its importance in industry and medicine. However, it remains difficult to distinguish these bacteria at the intra- and inter-species level. Bacillus thuringiensis (Bt) is a member of the B. cereus group. In this work, we studied the inter-species structure of five entomopathogenic strains and 20 isolates of Bt, which were collected from different geo-ecological regions of Ukraine, using various methods: physiological and biochemical analyses, analysis of the nucleotide sequences of the 16S rRNA and gyrB genes, by AP-PCR (BOX and ERIC), and by saAFLP. The analysis of the 16S rRNA and gyrB genes revealed the existence of six subgroups within the B. cereus group: B anthracis, B. cereus I and II, Bt I and II, and Bt III, and confirmed that these isolates belong to the genus Bacillus. All strains were subdivided into 3 groups. Seventeen strains belong to the group Bt II of commercial, industrial strains. The AP-PCR (BOX and ERIC) and saAFLP results were in good agreement and with the results obtained for the 16S rRNA and gyrB genes. Based on the derived patterns, all strains were reliably combined into 5 groups. Interestingly, a specific pattern was revealed by the saAFLP analysis for the industrial strain Bt 0376 р.о., which is used to produce the entomopathogenic preparation STAR-t.
ABSTRACT RNA interference is a convenient tool for modulating gene expression. The widespread application of RNA interference is made difficult because of the imperfections of the methods used for efficient target cell delivery of whatever genes are under study. One of the most convenient and efficient gene transfer and expression systems is based on the use of lentiviral vectors, which direct the synthesis of small hairpin RNAs (shRNAs), the precursors of siRNAs. The application of these systems enables one to achieve sustainable and long-term shRNA expression in cells. This review considers the adaptation of the processing of artificial shRNA to the mechanisms used by cellular microRNAs and simultaneous expression of several shRNAs as potential approaches for producing lentiviral vectors that direct shRNA synthesis. Approaches to using RNA interference for the treatment of cancer, as well as hereditary and viral diseases, are under active development today. The improvement made to the methods for constructing lentiviral vectors and the investigation into the mechanisms of processing of small interfering RNA allow one to now consider lentiviral vectors that direct shRNA synthesis as one of the most promising tools for delivering small interfering RNAs.
ABSTRACT Dosage compensation of the X chromosomes in mammals is performed via the formation of facultative heterochromatin on extra X chromosomes in female somatic cells. Facultative heterochromatin of the inactivated X (Xi), as well as constitutive heterochromatin, replicates late during the S-phase. It is generally accepted that Xi is always more compact in the interphase nucleus. The dense chromosomal folding has been proposed to define the late replication of Xi. In contrast to mouse pluripotent stem cells (PSCs), the status of X chromosome inactivation in human PSCs may vary significantly. Fluorescence in situ hybridization with a whole X-chromosome-specific DNA probe revealed that late-replicating Xi may occupy either compact or dispersed territory in human PSCs. Thus, the late replication of the Xi does not depend on the compactness of chromosome territory in human PSCs. However, the Xi reactivation and the synchronization in the replication timing of X chromosomes upon reprogramming are necessarily accompanied by the expansion of X chromosome territory.
KEYWORDS reprogramming; ESCs; iPS cells; chromosome territories; the X chromosome; late replication
ABBREVIATIONS BrdU – 5-bromo-2’-deoxyuridine; DAPI – 4’, 6-diamidino-2-phenylindole; ESCs – embryonic stem cells; FISH – fluorescent in situ hybridization; H3K27me3 – trimethylation of histone H3 at lysine 27; H3K4me2 – dimethylation of histone H3 at lysine 4; H3K9me3 – trimethylation of histone H3 at lysine 9; HUVEC – human umbilical vein endothelial cells; iPS cells – induced pluripotent stem cells; Xa – active X chromosome; Xi – inactive X chromosome, PSC - pluripotent stem cells
ABSTRACT The aim of this study was to identify small molecule compounds that inhibit the kinase activity of the IGF1 receptor and represent novel chemical scaffolds, which can be potentially exploited to develop drug candidates that are superior to the existing experimental anti-IGF1R therapeuticals. To this end, targeted compound libraries were produced by virtual screening using molecular modeling and docking strategies, as well as the ligand-based pharmacophore model. High-throughput screening of the resulting compound sets in a biochemical kinase inhibition assay allowed us to identify several novel chemotypes that represent attractive starting points for the development of advanced IGF1R inhibitory compounds.
ABSTRACT Whole transcriptome profiling is now almost routinely used in various fields of biology, including microbiology. In vivo transcriptome studies usually provide relevant information about the biological processes in the organism and thus are indispensable for the formulation of hypotheses, testing, and correcting. In this study, we describe the results of genome-wide transcriptional profiling of the major human bacterial pathogen M. tuberculosis during its persistence in lungs. Two mouse strains differing in their susceptibility to tuberculosis were used for experimental infection with M. tuberculosis. Mycobacterial transcriptomes obtained from the infected tissues of the mice at two different time points were analyzed by deep sequencing and compared. It was hypothesized that the changes in the M. tuberculosis transcriptome may attest to the activation of the metabolism of lipids and amino acids, transition to anaerobic respiration, and increased expression of the factors modulating the immune response. A total of 209 genes were determined whose expression increased with disease progression in both host strains (commonly upregulated genes, CUG). Among them, the genes related to the functional categories of lipid metabolism, cell wall, and cell processes are of great interest. It was assumed that the products of these genes are involved in M. tuberculosis adaptation to the host immune system defense, thus being potential targets for drug development.
KEYWORDS Mycobacterium tuberculosis; transcriptome in vivo; next generation sequencing; RNA-seq; tuberculosis
ABSTRACT Recombinant blood clotting factor VIII is one of the most complex proteins for industrial manufacturing due to the low efficiency of its gene transcription, massive intracellular loss of its proprotein during post-translational processing, and the instability of the secreted protein. Improvement in hemophilia A therapy requires a steady increase in the production of factor VIII drugs despite tightening standards of product quality and viral safety. More efficient systems for heterologous expression of factor VIII can be created on the basis of the discovered properties of its gene transcription, post-translational processing, and behavior in the bloodstream. The present review describes the deletion variants of factor VIII protein with increased secretion efficiency and the prospects for the pharmaceutical development of longer acting variants and derivatives of factor VIII.
KEYWORDS blood clotting factor VIII; hemophilia A; heterologous protein expression systems
ABBREVIATIONS FVIII – blood clotting factor VIII; BDD – B domain deleted; IU – international unit; FVIII:Ag – concentration of FVIII antigen; FVIII:C – procoagulant activity of FVIII; vWF – von Willebrand factor. Addition of “a” to the number of the corresponding clotting factor denotes the activated factor
ABSTRACT X chromosome inactivation is a complex process that occurs in marsupial and eutherian mammals. The process is thought to have arisen during the differentiation of mammalian sex chromosomes to achieve an equal dosage of X chromosome genes in males and females. The differences in the X chromosome inactivation processes in marsupial and eutherian mammals are considered, and the hypotheses on its origin and evolution are discussed in this review.
KEYWORDS mammals; X chromosome inactivation; Xist
ABBREVIATIONS XIC – X inactivation center; PAR – pseudoautosomal region of the mammalian X chromosome
of Cytology, Russian Academy of Sciences, Tikhoretsky ave., 4, St. Petersburg, 194064
ABSTRACT Most neurodegenerative pathologies stem from the formation of aggregates of mutant proteins, causing dysfunction and ultimately neuronal death. This study was aimed at elucidating the role of the protein factors that promote aggregate formation or prevent the process, respectively, glyceraldehyde-3-dehydrogenase (GAPDH) and tissue transglutaminase (tTG) and Hsp70 molecular chaperone. The siRNA technology was used to show that the inhibition of GAPDH expression leads to a 4550% reduction in the aggregation of mutant huntingtin, with a repeat of 103 glutamine residues in a model of Huntingtons disease (HD). Similarly, the blockage of GAPDH synthesis was found for the first time to reduce the degree of aggregation of mutant superoxide dismutase 1 (G93A) in a model of amyotrophic lateral sclerosis (ALS). The treatment of cells that imitate HD and ALS with a pharmacological GAPDH inhibitor, hydroxynonenal, was also shown to reduce the amount of the aggregating material in both disease models. Tissue transglutaminase is another factor that promotes the aggregation of mutant proteins; the inhibition of its activity with cystamine was found to prevent aggregate formation of mutant huntingtin and SOD1. In order to explore the protective function of Hsp70 in the control of the aggregation of mutant huntingtin, a cell model with inducible expression of the chaperone was used. The amount and size of polyglutamine aggregates were reduced by increasing the intracellular content of Hsp70. Thus, pharmacological regulation of the function of three proteins, GAPDH, tTG, and Hsp70, can affect the pathogenesis of two significant neurodegenerative diseases.
ABSTRACT Transcription regulation in bacterial restrictionmodification (RM) systems is an important process, which provides coordinated expression levels of tandem enzymes, DNA methyltransferase (MTase) and restriction endonuclease (RE) protecting cells against penetration of alien DNA. The present study focuses on (cytosine-5)-DNA methyltransferase Ecl18kI (M.Ecl18kI), which is almost identical to DNA methyltransferase SsoII (M.SsoII) in terms of its structure and properties. Each of these enzymes inhibits expression of the intrinsic gene and activates expression of the corresponding RE gene via binding to the regulatory site in the promoter region of these genes. In the present work, complex formation of M.Ecl18kI and RNA polymerase from Escherichia сoli with the promoter regions of the MTase and RE genes is studied. The mechanism of regulation of gene expression in the Ecl18kI RM system is thoroughly investigated. M.Ecl18kI and RNA polymerase are shown to compete for binding to the promoter region. However, no direct contacts between M.Ecl18kI and RNA polymerase are detected. The properties of M.Ecl18kI and M.SsoII mutants are studied. Amino acid substitutions in the N-terminal region of M.Ecl18kI, which performs the regulatory function, are shown to influence not only M.Ecl18kI capability to interact with the regulatory site and to act as a transcription factor, but also its ability to bind and methylate the substrate DNA. The loss of methylation activity does not prevent MTase from performing its regulatory function and even increases its affinity to the regulatory site. However, the presence of the domain responsible for methylation in the M.Ecl18kI molecule is necessary for M.Ecl18kI to perform its regulatory function.
Metagenomic Analysis of the Dynamic Changes in the Gut Microbiome of the Participants of the MARS-500 Experiment, Simulating Long Term Space Flight
A metagenomic analysis of the dynamic changes of the composition of the intestinal microbiome of five participants of the MARS-500 experiment was performed. DNA samples were isolated from the feces of the participants taken just before the experiment, upon 14, 30, 210, 363 and 510 days of isolation in the experimental module, and two weeks upon completion of the experiment. The taxonomic composition of the microbiome was analyzed by pyrosequencing of 16S rRNA gene fragments. Both the taxonomic and functional gene content of the microbiome of one participant were analyzed by whole metagenome sequencing using the SOLiD technique. Each participant had a specific microbiome that could be assigned to one of three recognized enterotypes. Two participants had enterotype I microbiomes characterized by the prevalence of Bacteroides, while the microbiomes of two others, assigned to type II, were dominated by Prevotella. One participant had a microbiome of mixed type. It was found that (1) changes in the taxonimic composition of the microbiomes occurred in the course of the experiment, but the enterotypes remained the same; (2) significant changes in the compositions of the microbiomes occurred just 14-30 days after the beginning of the experiment, presumably indicating the influence of stress factors in the first stage of the experiment; (3) a tendency toward a reversion of the microbiomes to their initial composition was observed two weeks after the end of the experiment, but complete recovery was not achieved. The metagenomic analysis of the microbiome of one of the participants showed that in spite of variations in the taxonomic compositions of microbiomes, the “functional” genetic composition was much more stable for most of the functional gene categories. Probably in the course of the experiment the taxonomic composition of the gut microbiome was adaptively changed to reflect the individual response to the experimental conditions. A new, balanced taxonomic composition of the microbiome was formed to ensure a stable gene content of the community as a whole without negative consequences for the health of the participants.
Transfer of Silver Nanoparticles through the Placenta and Breast Milk during in vivo Experiments on Rats
Silver nanoparticles (NPs), widely used in the manufacture of various types of consumer products and for medical applications, belong to novel types of materials that pose potential risks to human health. The potential negative effects of the influence of these NPs on reproduction are insufficiently researched. A quantitative assessment of the transfer of metallic silver nanoparticles through the placenta and breast milk was carried out during an in vivo experiment. We used 34.9 ± 14.8 nm in size silver NPs that were stabilized by low-molecularweight polyvinylpyrrolidone and labeled with the 110mAg radioactive isotope using thermal neutron irradiation in a nuclear reactor. [110mAg]-labeled NPs preparations were administered intragastrically via a gavage needle to pregnant (20th day of gestation) or lactating (14–16th day of lactation) female rats at a dose of 1.69–2.21 mg/kg of body weight upon conversion into silver. The accumulation of NPs in rat fetuses and infant rats consuming their mother’s breast milk was evaluated using a low-background semiconductor gamma-ray spectrometer 24 and 48 hours following labeling, respectively. In all cases, we observed a penetration of the [110mAg]-labeled NPs through the placenta and ther entry into the mother’s milk in amounts exceeding by 100-1,000 times the sensitivity of the utilized analytical method. The average level of accumulation of NPs in fetuses was 0.085–0.147% of the administered dose, which was comparable to the accumulation of the label in the liver, blood, and muscle carcass of adult animals and exceeded the penetration of NPs across the hematoencephalic barrier into the brain of females by a factor of 10-100. In lactating females, the total accumulation of [110mAg]-labeled NPs into the milk exceeded 1.94 ± 0.29% of the administered dose over a 48 h period of lactation; not less than 25% of this amount was absorbed into the gastrointestinal tract of infant rats. Thus, this was the first time experimental evidence of the transfer of NPs from mother to offspring through the placenta and breast milk was obtained.
Non-Viral Delivery and Therapeutic Application of Small Interfering RNAs
RNA interference (RNAi) is a powerful method used for gene expression regulation. The increasing knowledge about the molecular mechanism of this phenomenon creates new avenues for the application of the RNAi technology in the treatment of various human diseases. However, delivery of RNA interference mediators, small interfering RNAs (siRNAs), to target cells is a major hurdle. Effective and safe pharmacological use of siRNAs requires carriers that can deliver siRNA to its target site and the development of methods for protection of these fragile molecules from in vivo degradation. This review summarizes various strategies for siRNA delivery, including chemical modification and non-viral approaches, such as the polymer-based, peptide-based, lipid-based techniques, and inorganic nanosystems. The advantages, disadvantages, and prospects for the therapeutic application of these methods are also examined in this paper.
RNA interference; small interfering RNA; non-viral delivery.
S.A. Perevoztchikova, E.A. Romanova, T.S. Oretskaya, P. Friedhoff3, E.A. Kubareva*
Modern Aspects of the Structural and Functional Organization of the DNA Mismatch Repair System
This review is focused on the general aspects of the DNA mismatch repair (MMR) process. The key proteins of the DNA mismatch repair system are MutS and MutL. To date, their main structural and functional characteristics have been thoroughly studied. However, different opinions exist about the initial stages of the mismatch repair process with the participation of these proteins. This review aims to summarize the data on the relationship between the two MutS functions, ATPase and DNA-binding, and to systematize various models of coordination between the mismatch site and the strand discrimination site in DNA. To test these models, novel techniques for the trapping of short-living complexes that appear at different MMR stages are to be developed.
DNA mismatch repair system, structure of proteins, protein-protein and protein-DNA interactions, MutS, MutL, MutH.
S.A. Borinskaya*, A.A. Kim, A.V. Rubanovich, N.K. Yankovsky
The Impact of ADH1B Alleles and Educational Status on Levels and Modes of Alcohol Consumption in Russian Male Individuals
Alcohol abuse is one of the main reasons behind the low life span in Russia. Both social and genetic factors affect the alcohol consumption level. The genetic factors are alleles of the alcohol dehydrogenase ADH1B and aldehyde dehydrogenaseALDH2 genes. We have typed and found frequencies for the alleles in a cohort of 642 men, ethnic Russians. The individuals of the cohort were asked to complete a questionnaire in the framework of the Izhevsk Family Study (Leon et al., 2007, 2009) regarding the amount of alcohol consumed and on the type of hazardous alcohol consumption (nonbeverage alcohol consumption and the so-called “zapoï” which is a Russian term for a heavy drinking bout lasting for at least 2 days, when an individual is withdrawn from the normal social life). The ADH1B*48His allele was found among heterozygous individuals only (N=68, 10.6% of the cohort). The ALDH2*504Lys allele was also found among heterozygous individuals only (N=2, 0.3%) The effect of ADH1B alleles and the influence of the education level on the amount and type of alcohol consumed had not previously been studied in Russians. We have found that the amount of consumed alcohol is 21.6% lower (1733 g of ethanol per year) for ADH1B*48His allele carriers in the cohort of Russian men. The amount of consumed alcohol was found to be 9.8% lower (793 g of ethanol per year) in the case when individuals had a higher education as compared to those who had a secondary- or elementary school education level in the same cohort. Hence, the protective effect of the genetic factor (ADH1B*48His allele carriage) has proven to be more pronounced than the influence of the social factor (education level) at the individual level in the cohort of Russian men. Both factors have also proven to have a protective effect against hazardous types of alcohol consumption. Zapoï was not scored among individuals of the cohort with ADH1B*48His allele carriage (OR=12.6, P=0.006), as compared to 8.4% of “zapoï” individuals who did not carry the ADH1B*48His allele (genotype Arg/Arg).The percentage of individuals who consume non-beverage alcohol is lower (0.6%) in the subcohort of people with a higher education degree. This percentage is higher (6.0%, OR=10.0, P=0.004) in the subcohort of people without a higher education degree.
alcohol consumption level; genetic polymorphisms; ADH1B gene; social factors.
Original Nerve Growth Factor Mimetic Dipeptide GK-2 Restores Impaired Cognitive Functions in Rat Models of Alzheimer’s Disease
Dipeptide mimetic of the nerve growth factor (NGF) loop 4, hexamethylenediamide bis-(N-monosuccinyl- glutamyl-lysine) (GK-2), was synthesized at the V.V. Zakusov Scientific Research Institute of Pharmacology of the Russian Academy of Medical Sciences. GK-2 exhibited in vitro neuroprotective activity at nanomolar concentrations, was efficient in animal models of the Parkinson’s disease, ischemic and hemorrhagic stroke, and global cerebral ischemia at doses of 0.01–5 mg/kg (intraperitoneally) and 10 mg/kg (per os). The mnemotropic effects of subchronic intraperitoneal administration of GK-2 on rat models of the Alzheimer’s disease are described in this paper. Dipeptide GK-2 at a dose of 1 mg/kg is found to decrease the habituation deficit induced by the septo-hippocampal pathway transsection and, at a dose of 0.5 mg/kg, to significantly prevent spatial memory impairment in Morris water maze induced by intracerebral injection of streptozotocin. Thus, GK-2, an original dipeptide mimetic of NGF, acts on models of the Alzheimer’s disease upon systemic administration.
low molecular mimetic of NGF; GK-2; septo-hippocampal transsection; streptozotocin model of Alzheimer’s disease; habituation; Morris water maze.
K. N. Kashkin*, I. P. Chernov, E. A. Stukacheva, E. P. Kopantzev, G. S. Monastyrskaya, N. Ya. Uspenskaya, E. D. Sverdlov
Cancer Specificity of Promoters of the Genes Involved in Cell Proliferation Control
Core promoters with adjacent regions of the human genes CDC6, POLD1, CKS1B, MCM2, and PLK1 were cloned into a pGL3 vector in front of the Photinus pyrails gene Luc in order to study the tumor specificity of the promoters. The cloned promoters were compared in their ability to direct luciferase expression in different human cancer cells and in normal fibroblasts. The cancer-specific promoter BIRC5 and non-specific CMV immediately early gene promoter were used for comparison. All cloned promoters were shown to be substantially more active in cancer cells than in fibroblasts, while the PLK1 promoter was the most cancer-specific and promising one. The specificity of the promoters to cancer cells descended in the series PLK1, CKS1B, POLD1, MCM2, and CDC6. The bidirectional activity of the cloned CKS1B promoter was demonstrated. It apparently directs the expression of the SHC1 gene, which is located in a “head-to-head” position to the CKS1B gene in the human genome. This feature should be taken into account in future use of the CKS1B promoter. The cloned promoters may be used in artificial genetic constructions for cancer gene therapy.
promoter; cloning; cancer-specific; cancer gene therapy.
V. A. Glazunova, K. V. Lobanov, R. S. Shakulov, A. S. Mironov, A. A. Shtil
Acadesine Triggers Non-apoptotic Death in Tumor Cells
We studied the cytotoxicity of acadesine (5-aminoimidazole-4-carboxamide-1-β-D-ribofuranoside) for tumor and normal cells of various species and tissue origin. In tumor cells, acadesine triggered non-apoptotic death; the potency of the compound to normal cells was substantially lower. Acadesine was toxic for tumor cells with multidrug resistant phenotypes caused by the transmembrane transporter Р-glycoprotein or lack of proapoptotic p53. Activity of adenosine receptors was required for acadesine-induced cell death, whereas functioning of АМР-dependent protein kinase was not required. A more pronounced cytotoxicity for tumor cells, as well as the non-canonical death mechanism(s), makes acadesine a promising candidate for antitumor therapy.
AZT 5’-Phosphonates: Achievements and Trends in the Treatment and Prevention of HIV Infection
Despite the numerous drawbacks, 3’-azido-3’-deoxythymidine (AZT, Zidovudine, Retrovir) remains one of the key drugs used in the treatment and prevention of HIV infection in both monotherapy and HAART. A strategy in searching for new effective and safe AZT agents among latent (depot) forms of AZT has yielded its first positive results. In particular, the sodium salt of AZT 5’-H-phosphonate (Nikavir, phosphazide) has demonstrated clinical advantages over parent AZT: first and foremost, lower toxicity and better tolerability. It can be effectively used for the prevention of vertical transmission from mothers to babies and as an alternative drug for HIV-infected patients with low tolerance to Zidovudine. Preclinical studies of another phosphonate, AZT 5’-aminocarbonylphosphonate, have demonstrated that it releases AZT when taken orally. Pharmacokinetic studies have shown a prolonged action potential. Based on the analysis of both toxicological and pharmacological data, AZT 5’-aminocarbonylphosphonate has been recommended for clinical trials.
anti-HIV therapy; AZT 5'-phosphonates; depot forms; Nikavir; preclinical trials.
HIV RT – human immunodeficiency virus reverse transcriptase; AZT – 3’-azido-3’-deoxythymidine; 3ТС – (-)-β-L-2’,3’-dideoxy-3’-tiacytidine; L-FTC – (-)-β-L-2’,3’-dideoxy-3’-thia-5-fluoro-cytidine; НААRТ – high active antiretroviral therapy; LD50 – mean lethal dose; AUC – area under the concentration-time curve; MRT – mean residence time; CL – total clearance; Vss – steady state volume of distribution; F – bioavailability.
Bibliometric Indicators of Russian Journals by JCR-Science Edition, 1995-2010
A representative empirical bibliometric analysis of Russian journals included in the Journal Citation Reports-Science Edition (JCR-SE) for the time period 1995–2010 was conducted at the macro level (excluding the subject categories). It was found that the growth in the number of articles covered by JCR (a 1.8-fold increase compared to 1995) is ahead of the growth rates of Russian publications (1.2-fold increase). Hence, the share of Russian articles covered by JCR-SE was down from 2.5% in 1995 to 1.7% in 2010. It was determined that the number of articles published in an average Russian journal reduced by 20% as compared to the number of articles in an average journal of the full data set. These facts could partly shed light on the question why Russian research performance is staggering (approximately 30,000 articles per year), although the coverage of Russian journals has expanded to 150 titles. Over the past 15 years, a twofold increase in the impact factor of the Russian journals has been observed, which is higher than that for the full data set of journals (a 1.4-fold increase). Measures to improve the quality of Russian journals are proposed.
article; impact factor; Russian journal; full data set; bibliometric indicators; expected citation rate; JCR.
Kinetic Parameters and Cytotoxic Activity of Recombinant Methionine ?-Lyase from Clostridium tetani, Clostridium sporogenes, Porphyromonas gingivalis and Citrobacter freundii
The steady-state kinetic parameters of pyridoxal 5’-phosphate-dependent recombinant methionine γ-lyase from three pathogenic bacteria, Clostridium tetani, Clostridium sporogenes, and Porphyromonas gingivalis, were determined in β- and γ-elimination reactions. The enzyme from C. sporogenes is characterized by the highest catalytic efficiency in the γ-elimination reaction of L-methionine. It was demonstrated that the enzyme from these three sources exists as a tetramer. The N-terminal poly-histidine fragment of three recombinant enzymes influences their catalytic activity and facilitates the aggregation of monomers to yield dimeric forms under denaturing conditions. The cytotoxicity of methionine γ-lyase from C. sporogenes and C. tetani in comparison with Citrobacter freundii was evaluated using K562, PC-3, LnCap, MCF7, SKOV-3, and L5178y tumor cell lines. K562 (IC50=0.4–1.3 U/ml), PC-3 (IC50=0.1–0.4 U/ml), and MCF7 (IC50=0.04–3.2 U/ml) turned out to be the most sensitive cell lines.
Clathrin-Mediated Endocytosis and Adaptor Proteins
Macromolecules gain access to the cytoplasm of eukaryotic cells using one of several ways of which clathrin-dependent endocytosis is the most researched. Although the mechanism of clathrin-mediated endocytosis is well understood in general, novel adaptor proteins that play various roles in ensuring specific regulation of the mentioned process are being discovered all the time. This review provides a detailed account of the mechanism of clathrin-mediated internalization of activated G protein-coupled receptors, as well as a description of the major proteins involved in this process.
D.V. Shchepkin, A. M. Matyushenko, G.V. Kopylova, N.V. Artemova, S.Y. Bershitsky, A.K. Tsaturyan, D.I. Levitsky*
Stabilization of the Central Part of Tropomyosin Molecule Alters the Ca2+-sensitivity of Actin-Myosin Interaction
We show that the mutations D137L and G126R, which stabilize the central part of the tropomyosin (Tm) molecule, increase both the maximal sliding velocity of the regulated actin filaments in the in vitro motility assay at high Са2+ concentrations and the Са2+-sensitivity of the actin-myosin interaction underlying this sliding. Based on an analysis of the recently published data on the structure of the actin–Tm–myosin complex, we suppose that the physiological effects of these mutations in Tm can be accounted for by their influence on the interactions between the central part of Tm and certain sites of the myosin head.
actin-myosin interaction; in vitro motility assay; regulation of muscle contraction; tropomyosin.