International conference on bioinformatics of genome regulation
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Key words: plant cell wall, growth mechanics, orthotropic material Motivation and Aim: Mathematical modeling is powerful method to study plant cell and tissue growth. Turgor pressure and cell wall strain are considered to be driving force for cell growth. There are vertex dynamics-based (VD) models that are used to simulate plant tissue growth in frame of the growth mechanics. It is worth to note that the me- chanics in these models is oversimplified, and problems with adequacy arise especially in 2D-models of unidirectional growth. Some modifications were proposed to account effects of the cell walls in the plane of a 2D simulation (for example, additional structure elements, and restrictions on vertex possible movements). In this work we developed more realistic solid and shell mechanics models to study elastic behavior of plant cells with isotropic and orthotropic materials of cell wall. Methods and Algorithms: Approach of structural mechanics was applied to model plant cell wall material. The parameters of isotropic and orthotropic materials of cell walls were found in articles. The model of plant cell mechanics were developed in the COM- SOL package using shell mechanics and solid mechanics interfaces. Results: Calculations of stress-strain distribution in cell walls were performed in elastic mode. The calculations were done with different sets of parameters, inside-outside dif- ference of pressure, and additional forces applied to cell walls which imitate mechanical interaction of modeled cell with its neighbors. The results were used to infer growth distribution (plastic deformations) in the cell walls. Conclusion: The results demonstrate: 1) orthotropy of cell wall (small Young modulus along growth axis, and large one in perpendicular direction) can equalize stress distribu- tion under different additional forces from neighbor cells; 2) wide adopted picture that cell wall growth (plastic deformation) can be local and proportional to stress (strain) has to result not only in stress relaxation, but in increasing plastic deformation, and deviation from (“planned”) form, so this picture may demand a correction. Acknowledgements: The authors expresses gratitude to the supercomputer center of No- vosibirsk State University for the opportunity to use COMSOL 4.3b package. The re- ported study was supported by the Russian Science Foundation according to the research project № 14-14-00734. 207 THE TENTH INTERNATIONAL CONFERENCE ON BIOINFORMATICS OF GENOME REGULATION AND STRUCTURE\SYSTEMS BIOLOGY IN SILICO SCREENING FOR SULFONATE-BASED INHIBITORS AGAINST PROMISING ANTICANCER TARGETS D.K. Nilov 1 *, I.V. Gushchina 2 , V.K. Svedas 1, 2 Lomonosov Moscow State University 1 Belozersky Institute of Physicochemical Biology, Russia 2 Faculty of Bioengineering and Bioinformatics, Moscow, Russia * Corresponding author: nilov@belozersky.msu.ru Key words: molecular modeling, docking, enzyme inhibitors, sulfo group, sulfonates, lactate dehydroge- nase, tyrosyl-DNA phosphodiesterase 1, cancer Motivation and Aim: Human lactate dehydrogenase A (LDH-A) and tyrosyl-DNA phos- phodiesterase 1 (TDP-1) constitute attractive therapeutic targets in cancer metabolism [1, 2]. These enzymes convert substrates containing negatively charged carboxyl and phosphate groups. Virtual screening of compounds with a sulfo substituent that mimic abovementioned functional groups was performed to identify novel competitive inhibi- tors of LDH-A and TDP-1. Methods and Algorithms: Molecular models of LDH-A and TDP-1 were constructed on the basis of available crystal structures taking into account the ionization states of amino acid residues, and structural criteria for the selection of potential inhibitors were established. A library of commercially available low-molecular-weight sulfo derivatives was subjected to virtual screening. Docking of compounds into the protein models was performed using the Lead Finder software [3]. Inhibitory effects were tested in vitro against purified proteins. Results: The most effective inhibitors selected by virtual screening and experimental validation were able to form hydrogen bonds with Arg168 in the active site of LDH-A, and with Lys265 and Lys495 in the active site of TDP-1. The sulfo group of the inhibitors was shown to occupy the position of the carboxyl or phosphate group of the correspond- ing substrate. Dependence of inhibitory properties of sulfonates on their structure was analyzed and directions for further structural modification of compounds were proposed. Conclusion: Molecular models of human LDH-A and TDP-1 were used to screen a li- brary of low-molecular-weight sulfonates what enabled us to identify potential inhibitors of both enzymes. The novel LDH-A and TDP-1 inhibitors will be further investigated as target-driven anticancer agents. Acknowledgements: This work was supported by the Russian Foundation for Basic Re- search (grant 14-08-01251) and by the President of the Russian Federation (grant for young scientists МК-7630.2016.4). References: 1. C. Granchi et al. (2013) Small-molecule inhibitors of human LDH5, Future Med. Chem., 5: 1967- 1991. 2. E.Q. Comeaux, R.C. van Waardenburg (2014) Tyrosyl-DNA phosphodiesterase I resolves both natu- rally and chemically induced DNA adducts and its potential as a therapeutic target, Drug Metab. Rev., 46: 494-507. 3. O.V. Stroganov et al. (2008) Lead finder: an approach to improve accuracy of protein-ligand docking, binding energy estimation, and virtual screening, J. Chem. Inf. Model., 48: 2371-2385. 208 THE TENTH INTERNATIONAL CONFERENCE ON BIOINFORMATICS OF GENOME REGULATION AND STRUCTURE\SYSTEMS BIOLOGY PROTEOMIC SCREENING FOR AMYLOID-FORMING PROTEINS IN BACTERIA ESCHERICHIA COLI A.A. Nizhnikov 1, 2, 3 *, K.S. Antonets 1, 2 , K.V. Volkov 1 , A.L. Maltseva 1 , A.P. Galkin 1, 2 1 St. Petersburg State University, St. Petersburg, Russia 2 Vavilov Institute of General Genetics (St. Petersburg Branch), St. Petersburg, Russia 3 All-Russian Research Institute for Agricultural Microbiology, St. Petersburg, Russia * Corresponding author: ant.nizhnikov@gmail.com Key words: amyloid, E.coli, HPLC, MALDI, protein identification Motivation and aims: Amyloids represent protein fibers exhibiting cross-beta structure. They are found in different organisms, from bacteria to human, and can be pathogenic, useless, and functional. Functions of amyloids in bacteria spread from biofilm forma- tion to parasite-host interaction. Importantly, bacterial amyloids identified to date were found accidentally, and screenings for amyloid-forming proteins in the proteomes of these organisms were never carried out before. The goal of this study was to implement a proteome-wide screen for candidates for amyloid-forming proteins in well-known pro- karyote Escherichia coli. Methods: Screening for candidates for novel amyloid-forming proteins was performed with previously developed PSIA (Proteomic Screening and Identification of Amyloids) approach [1] improved by HPLC-separation of the tryptic peptides [2]. Results: We identified 61 detergent-resistant proteins. This protein set was 3-5 fold en- riched with potentially amyloidogenic regions predicting by different bioinformatics algorithms (WALTZ, SARP) in comparison with the entire E. coli proteome. 56 of 61 proteins contain potentially amyloidogenic regions, and four (BcsC, MukB, YfbK, and YghJ) carry low-complexity N- and Q-rich regions that is the hallmark of a number of known amyloid-forming proteins [2]. Conclusion: There is unexpected diversity of E.coli proteins forming detergent-resistant aggregates in vivo at the physiological level of expression. These proteins are rich in potentially amyloidogenic low-complexity regions. Acknowledgements: This work was supported by the grants of the President of the Rus- sian Federation (MK-4854.2015.4), Russian Foundation for Basic Research (16-34- 60153, 14-04-01463), and St. Petersburg Government. The authors acknowledge Saint- Petersburg University for research grants 1.50.2543.2013 and 1.37.291.2015, and the opportunity to use facilities of the “Research Resource Center for Molecular and Cell Technologies” and “Chromas.” References: 1. Nizhnikov A.A. et al. (2014) Proteomic screening for amyloid proteins, PLoS One, 9: e116003. 2. Antonets K.S. et al. (2016) Proteomic Analysis of Escherichia coli Protein Fractions Resistant to Solubilization by Ionic Detergents, Biochemistry(Mosk), 81:34-46. 209 THE TENTH INTERNATIONAL CONFERENCE ON BIOINFORMATICS OF GENOME REGULATION AND STRUCTURE\SYSTEMS BIOLOGY IDENTIFICATION OF STURGEON SPECIES WITH MTDNA AND MICROSATELLITE MARKERS IN BELARUS A.Yu. Nosova Institute of Genetics and Cytology NAS of Belarus, Minsk, Belarus * Corresponding author: A.Nosova@igc.by Key words: Genotyping, sturgeon, species identification, hybrids Motivation and Aim: Sturgeons are a unique ancient group of fishes and are com- mercially important. Since the natural populations have dramatically decreased in size, sturgeon domestication and artificial rearing become widespread. Usually, there is no sufficient work on the preservation of the purity of livestock in aquaculture. However, the cost of products is significantly different depending on the species. Identification of the species is complicated by the morphological similarity of sturgeons of commercial size, or impossible for fish products and caviar. This study was conducted to determine the efficiency of using mtDNA and microsatellite markers for the identification of stur- geon species in Belarus. Methods and materials: We obtained fins fragments of 32 individuals including 7 Si- berian sturgeons, 5 Russian sturgeons, 5 starlets, 5 belugas and 10 interspecific hybrids from local fish farm. For species identification variations of the mtDNA control region (D-loop) were studied by PCR analysis [1]. Sturgeons were genotyped by fragment anal- ysis of a set of five microsatellite loci (Afug41, Afug51, An20, AoxD161, AoxD165) [2]. Results: The analysis of mtDNA variations and microsatellite alleles confirmed that 22 individuals of pure species and 10 of interspecific hybrids were provided. Hybrid individuals were represented by 4 Besters (beluga×starlet), 4 Steroses (starlet×Siberian sturgeon). Presumably, two samples differing from the declared were reciprocal hybrids starlet×beluga and Siberian sturgeon×starlet. Conclusion: The methods of DNA identification can be conventionally divided into two groups addressing nuclear genetic markers and mitochondrial DNA (mtDNA). However, the maternal inheritance of mtDNA limits the use of this methodology for the hybrid individuals. The differences in STR allele frequencies among different species enable to identify individuals of hybrid origin. However, it should be taken into account that STR loci may vary from population to population. In our case, not all species-specific loci according to Barmintseva [2] were presented in studied animals. Availability: Thus, the use of PCR for identification is appropriate for maintaining the genetic purity of livestock and producers in aquaculture, and for detection of falsified caviar and other sturgeon products. An analysis of the polymorphism of the five micro- satellite loci should be used in the genetic pasportisation of aquaculture surgeon stocks and the species verification of the sturgeon products. References: 1. N.S. Mugue et al. (2008) Polymorphism of the Mitochondrial DNA Control Region in Eight Sturgeon Species and Development of a System for DNA-Based Species Identification, Russian Journal of Ge- netics, 44: 793-798. 2. A.E. Barmintseva, N. S. Mugue (2013) The Use of Microsatellite Loci for Identification of Sturgeon Species (Acipenseridae) and Hybrid Forms, Russian Journal of Genetics, 49: 950-961. 210 THE TENTH INTERNATIONAL CONFERENCE ON BIOINFORMATICS OF GENOME REGULATION AND STRUCTURE\SYSTEMS BIOLOGY MEMBRANE-ASSOCIATED KINASE REGULATORS OF MAKR FAMILY GENES IN ARABIDOPSIS THALIANA L. D.D. Novikova*, N.A. Omelyanchuk, V.V. Mironova Institute of Cytology and Genetics SB RAS, Novosibirsk, Russia NSU * Corresponding author: novikovadd@bionet.nsc.ru Key words: kinase receptor regulators, A. thaliana, kinase receptors, hormone signaling Motivation and Aim. Tyrosine kinase receptors and membrane-associated kinase regula- tors are involved in most signaling pathways, including those for plant hormone signal transduction. Recently, a family of membrane-associated kinase regulators (MAKR) was described in Arabidopsis thaliana [1]. MAKR family proteins have distant homol- ogy with the basic domain of BRI1 kinase inhibitor 1 (BKI1) which controls activity of tyrosine kinase receptor BRI1 in brassinosteroid signaling pathway. Here, we study phylogeny and systematize the publically available information about protein structure, expression and regulation of this poorly annotated gene family. Methods and Algorithms. First we analyzed the MAKRs protein sequences to reveal their features and signatures which might imply their potential functions by PhosphoS- VM and CBS Prediction servers. Further to investigate phylogenetic background and evolvement of MAKRs we have searched for their homologs throughout the plant king- dom using BLAST and PLAZA on-line services and constructed phylogenetic trees in MEGA 6.06 program. We analyzed data on their mRNA patterns which is presented in publicly available microarray experiments (eFP browser). To study the hormonal regula- tion of MAKRs in depth we analyzed their upstream [-1000; +1] regions for the presence of potential cis-regulatory sites using online tools AtCOECIS, TRANSFAC programs and CIS-BP database. Results and conclusions. MAKR family genes probably evolved together with land plants and as a result of duplication series all members of the family appeared. These proteins are widely spread among terrestrial plants. The latter uncovers their potentially important role in plant kingdom in general and in Arabidopsis in particular. Also some conservation was discovered among orthologs of all MAKRs, but none among paralogs, except C-terminus. According to protein modification prediction, all of MAKRs have plenty of modification sites. MAKRs are expressed tissue specifically and response to different hormones, they possess hormone responsive motifs corresponding to the sensi- tivity to the one. These findings suggest that MAKR family genes might play an impor- tant role in plant development regulation via signaling pathways. Obtained results may provide new ideas in searching for new regulators of growth and herbicides. References. 1. Jaillais Y. et al. Tyrosine phosphorylation controls brassinosteroid receptor activation by triggering membrane release of its kinase inhibitor // Genes & development. – 2011. – Т. 25. – №. 3. – С. 232- 237. 211 THE TENTH INTERNATIONAL CONFERENCE ON BIOINFORMATICS OF GENOME REGULATION AND STRUCTURE\SYSTEMS BIOLOGY MAPPING THE INTERACTION SITE FOR THE MESOBUTHUS SCORPION TOXINS IN THE VOLTAGE-GATED POTASSIUM CHANNEL KV1.2 V.N. Novoseletsky*, A.D. Volyntceva, K.V. Shaitan Lomonosov Moscow State University, Moscow, Russia * Corresponding author: valeryns@gmail.com Key words: molecular modeling, homology modeling, molecular dynamics, potassium channel, scorpion toxins Motivation and Aim: Voltage-gated potassium (K+) channels are transmembrane pore proteins and contribute to the regulation of membrane potential and, consequently, to cell excitability. Kv1.2 channels play pivotal role in maintaining of resting membrane potential and, consequently, regulation of cellular excitability of neurons. Their blockers have a high importance not only as probes the fundamental channel functioning investi- gation, but also as a potential drug for treatment epilepsy [1]. Goal of the current study was an interface analysis in complexes of Kv1.2 channel with peptide toxins MeuKTx1, MeuKTx3 и MeuKTx3B, derived from M. eupeus venom. Methods and Algorithms: 3D structure was generated by homology modeling using Kv1.2-2.1 paddle chimera channel in complex with charybdotoxin (pdb-code 4JTA) as a template and equilibrated by molecular dynamic simulation in Gromacs software. Anal- ysis of hydrophobic and stacking interactions, hydrogen and ionic bonds of the toxin and potassium channels was performed for representative frames with optimal toxins orientations using program Platinum [2] and APBS software package [3]. Results: Performed study revealed, that toxin MeuKTx3 demonstrates the highest af- finity to Kv1.2 channel. Contacts analysis allowed identifying key residues for binding process and the possible mutation points for enhancing toxin MeuKTx3 activity. Conclusion: The results of investigation are in good agreement with the experimental values of binding constants, obtained by competitive binding assays [4]. Results of the conducted investigation may find an application in fundamental science and drug design. Acknowledgements: The research was supported by the Russian Science Foundation grant № 14-14-00239. Simulations were performed using the Supercomputing Center of Lomonosov Moscow State University. References: 1. X. Wang et al. (2015) Mesomartoxin, a new Kv 1.2-selective scorpion toxin interacting with the chan- nel selectivity filter. Biochemical Pharmacology, 93(2): 232-239. 2. S. Unni et al. (2011) Web servers and services for electrostatics calculations with APBS and PDB- 2PQR. Journal of computational chemistry, 32(7): 1488-91. 3. T. Pyrkov et al. (2008) PLATINUM: Protein-Ligand Attractions Investigation Numerically, www. model.nmr.ru/platinum. 4. B. Gao et al. (2010) A potent potassium channel blocker from Mesobuthus eupeus scorpion venom, Biochimie, 92(12): 1847-1853. 212 THE TENTH INTERNATIONAL CONFERENCE ON BIOINFORMATICS OF GENOME REGULATION AND STRUCTURE\SYSTEMS BIOLOGY DISTRIBUTION OF 2541-2542DELCA KDPD FRAMESHIFT MUTATION IN GENOMES OF MYCOBACTERIUM TUBERCULOSIS FROM IRKUTSK OBLAST AND YAKUTIA O. Ogarkov 1, 2, 3 *, V. Sinkov 1 , I. Mokrousov 4 , S. Zhdanova 1 , P. Khromova 1 , E. Orlova 1, 3 1 Scientific Centre of the Family Health and Human Reproduction Problems, Irkutsk, Russia 2 Irkutsk State Medical Academy of Continuing Education, Irkutsk, Russia 3 Irkutsk State University, Irkutsk, Russia 4 Laboratory of Molecular Epidemiology and Evolutionary Genetics, St. Petersburg Pasteur Institute, St. Petersburg, Russia * Corresponding author obogarkov@yandex.ru Key words: tuberculosis, genomes, CC2-W148 Motivation and Aim: Whole-genome sequencing of 110 representative isolates of M.tuberculosis genotype Beijing [1] found 2541-2542delCA frameshift mutation in gene kdpD. This mutation strongly associated with CC2-W148 high-transmissible strain of tuberculosis. More other a partial deletion of the kdpDE operon in M. tuberculosis has already been associated with greater virulence [2]. The study was carried out for determination of the distribution this mutation among genomes of GMTV database [3] and clinical isolates. Methods and Algorithms: The publicly available WGS data of from the GMTV data- base (DB) [3] and DNAs of 256 clinical isolates from Irkutsk Oblast and Yakutia have been analyzed. In silico mutation was studied by in-house Perl-written annotation tool snpMiner2 [4]. In vitro 2541-2542 delCA was detected by RT-PCR with specially de- signed TaqMan probes. Results: In the GMTV DB were found only 40 genomes of Beijing genotypes with in- vestigated mutation. However by PCR results 78 (30.5%) isolates from 256 known Bei- jing genotypes within two regions had this mutation. In addition two strains were mix W148\nonW genotypes. The most of W148 stains (81.3%) were MDR and only 6 (7.5%) were susceptibility. Among 176 non-W148 strains only 38 (21.6%) were MDR and 102 (58.0%) susceptibility (χ 2 =7.9; p<0.01). In addition the analysis of drug resistance pro- files of 256 isolates revealed an interesting pattern. W148 strains had significantly less resistance to cycloserine and ethionamide (χ 2 =10.8; p<0.01). However the analysis of mutations in Rv0486, Rv3199c, Rv3793, Rv3794 of Beijing genomes (GMTV DB) has not confirmed this pattern. Conclusion: Investigation of 2541-2542delCA is a convenient tool to identify highly transmissible CC2-W148 genotype of tuberculosis in silico and in vitro. Acknowledgments: The work was supported by RFBR grant #16-04-00160 А. Availability: 10.5281/zenodo.51052 References: 1. M. Merker et al. (2015). Evolutionary history and global spread of the Mycobacterium tuberculosis Beijing lineage, Nat Genet., 47(3): 242-249. 2. T. Parish, et al. (2003). Deletion of two-component regulatory systems increases the virulence of My- cobacterium tuberculosis, Infect. Immun., 71: 1134-1140. 3. E.N. Chernyaeva et. al. (2014). Genome-wide Mycobacterium tuberculosis variation (GMTV) data- base: a new tool for integrating sequence variations and epidemiology, BMC Genomics, 15(1): 308. 4. V.V. Sinkov (2016). snpMiner2: vcf files annotation tool. Zenodo. 10.5281/zenodo.51052. 213 THE TENTH INTERNATIONAL CONFERENCE ON BIOINFORMATICS OF GENOME REGULATION AND STRUCTURE\SYSTEMS BIOLOGY VASCULAR ENDOTHELIAL GROWTH FACTOR POLYMORPHISMS ARE ASSOCIATED WITH THE EARLIER ONSET OF RHEUMATOID ARTHRITIS V.O. Omelchenko 1 *, M.A. Korolev 1 , E.A. Letyagina 1 , A.V. Shevchenko 1 , V.F. Prokof’yev 1 , T.I. Pospelova 2 , V.I. Konenkov 1 1 Scientific Institute of clinical and experimental lymрhology SB RAS, Novosibirsk, Russia 2 Novosibirsk State Medical University, Novosibirsk, Russia * Corresponding author: v.o.omelchenko@gmail.com Download 3.91 Kb. Do'stlaringiz bilan baham: |
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