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Wang Q, Peng W, Rong J, Zhang M, Jia W, Lei X, Wang Y. Molecular analysis of the 14-3-3 genes in Panax ginseng and their responses to heat stress. PeerJ 2023; 11:e15331. [PMID: 37187526 PMCID: PMC10178371 DOI: 10.7717/peerj.15331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Accepted: 04/10/2023] [Indexed: 05/17/2023] Open
Abstract
Background Panax Ginseng is a perennial and semi-shady herb with tremendous medicinal value. Due to its unique botanical characteristics, ginseng is vulnerable to various abiotic factors during its growth and development, especially in high temperatures. Proteins encoded by 14-3-3 genes form a highly conserved protein family that widely exists in eukaryotes. The 14-3-3 family regulates the vital movement of cells and plays an essential role in the response of plants to abiotic stresses, including high temperatures. Currently, there is no relevant research on the 14-3-3 genes of ginseng. Methods The identification of the ginseng 14-3-3 gene family was mainly based on ginseng genomic data and Hidden Markov Models (HMM). We used bioinformatics-related databases and tools to analyze the gene structure, physicochemical properties, cis-acting elements, gene ontology (GO), phylogenetic tree, interacting proteins, and transcription factor regulatory networks. We analyzed the transcriptome data of different ginseng tissues to clarify the expression pattern of the 14-3-3 gene family in ginseng. The expression level and modes of 14-3-3 genes under heat stress were analyzed by quantitative real-time PCR (qRT-PCR) technology to determine the genes in the 14-3-3 gene family responding to high-temperature stress. Results In this study, 42 14-3-3 genes were identified from the ginseng genome and renamed PgGF14-1 to PgGF14-42. Gene structure and evolutionary relationship research divided PgGF14s into epsilon (ε) and non-epsilon (non-ε) groups, mainly located in four evolutionary branches. The gene structure and motif remained highly consistent within a subgroup. The physicochemical properties and structure of the predicted PgGF14 proteins conformed to the essential characteristics of 14-3-3 proteins. RNA-seq results indicated that the detected PgGF14s existed in different organs and tissues but differed in abundance; their expression was higher in roots, stems, leaves, and fruits but lower in seeds. The analysis of GO, cis-acting elements, interacting proteins, and regulatory networks of transcription factors indicated that PgGF14s might participate in physiological processes, such as response to stress, signal transduction, material synthesis-metabolism, and cell development. The qRT-PCR results indicated PgGF14s had multiple expression patterns under high-temperature stress with different change trends in several treatment times, and 38 of them had an apparent response to high-temperature stress. Furthermore, PgGF14-5 was significantly upregulated, and PgGF14-4 was significantly downregulated in all treatment times. This research lays a foundation for further study on the function of 14-3-3 genes and provides theoretical guidance for investigating abiotic stresses in ginseng.
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Affiliation(s)
- Qi Wang
- College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun, Jilin, China
| | - Wenyue Peng
- College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun, Jilin, China
| | - Junbo Rong
- College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun, Jilin, China
| | - Mengyang Zhang
- College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun, Jilin, China
| | - Wenhao Jia
- College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun, Jilin, China
| | - Xiujuan Lei
- College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun, Jilin, China
| | - Yingping Wang
- College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun, Jilin, China
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Abbasi BA, Saraf D, Sharma T, Sinha R, Singh S, Sood S, Gupta P, Gupta A, Mishra K, Kumari P, Rawal K. Identification of vaccine targets & design of vaccine against SARS-CoV-2 coronavirus using computational and deep learning-based approaches. PeerJ 2022; 10:e13380. [PMID: 35611169 PMCID: PMC9124463 DOI: 10.7717/peerj.13380] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 04/13/2022] [Indexed: 01/13/2023] Open
Abstract
An unusual pneumonia infection, named COVID-19, was reported on December 2019 in China. It was reported to be caused by a novel coronavirus which has infected approximately 220 million people worldwide with a death toll of 4.5 million as of September 2021. This study is focused on finding potential vaccine candidates and designing an in-silico subunit multi-epitope vaccine candidates using a unique computational pipeline, integrating reverse vaccinology, molecular docking and simulation methods. A protein named spike protein of SARS-CoV-2 with the GenBank ID QHD43416.1 was shortlisted as a potential vaccine candidate and was examined for presence of B-cell and T-cell epitopes. We also investigated antigenicity and interaction with distinct polymorphic alleles of the epitopes. High ranking epitopes such as DLCFTNVY (B cell epitope), KIADYNKL (MHC Class-I) and VKNKCVNFN (MHC class-II) were shortlisted for subsequent analysis. Digestion analysis verified the safety and stability of the shortlisted peptides. Docking study reported a strong binding of proposed peptides with HLA-A*02 and HLA-B7 alleles. We used standard methods to construct vaccine model and this construct was evaluated further for its antigenicity, physicochemical properties, 2D and 3D structure prediction and validation. Further, molecular docking followed by molecular dynamics simulation was performed to evaluate the binding affinity and stability of TLR-4 and vaccine complex. Finally, the vaccine construct was reverse transcribed and adapted for E. coli strain K 12 prior to the insertion within the pET-28-a (+) vector for determining translational and microbial expression followed by conservancy analysis. Also, six multi-epitope subunit vaccines were constructed using different strategies containing immunogenic epitopes, appropriate adjuvants and linker sequences. We propose that our vaccine constructs can be used for downstream investigations using in-vitro and in-vivo studies to design effective and safe vaccine against different strains of COVID-19.
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Dos Santos VP, Rodrigues A, Dutra G, Bastos L, Mariano D, Mendonça JG, Lobo YJG, Mendes E, Maia G, Machado KDS, Werhli AV, Rocha G, de Lima LHF, de Melo-Minardi R. E-Volve: understanding the impact of mutations in SARS-CoV-2 variants spike protein on antibodies and ACE2 affinity through patterns of chemical interactions at protein interfaces. PeerJ 2022; 10:e13099. [PMID: 35341044 PMCID: PMC8953562 DOI: 10.7717/peerj.13099] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Accepted: 02/21/2022] [Indexed: 01/12/2023] Open
Abstract
Background The SARS-CoV-2 pandemic reverberated, posing health and social hygiene obstacles throughout the globe. Mutant lineages of the virus have concerned scientists because of convergent amino acid alterations, mainly on the viral spike protein. Studies have shown that mutants have diminished activity of neutralizing antibodies and enhanced affinity with its human cell receptor, the ACE2 protein. Methods Hence, for real-time measuring of the impacts caused by variant strains in such complexes, we implemented E-Volve, a tool designed to model a structure with a list of mutations requested by users and return analyses of the variant protein. As a proof of concept, we scrutinized the spike-antibody and spike-ACE2 complexes formed in the variants of concern, B.1.1.7 (Alpha), B.1.351 (Beta), and P.1 (Gamma), by using contact maps depicting the interactions made amid them, along with heat maps to quantify these major interactions. Results The results found in this study depict the highly frequent interface changes made by the entire set of mutations, mainly conducted by N501Y and E484K. In the spike-Antibody complex, we have noticed alterations concerning electrostatic surface complementarity, breaching essential sites in the P17 and BD-368-2 antibodies. Alongside, the spike-ACE2 complex has presented new hydrophobic bonds. Discussion Molecular dynamics simulations followed by Poisson-Boltzmann calculations corroborate the higher complementarity to the receptor and lower to the antibodies for the K417T/E484K/N501Y (Gamma) mutant compared to the wild-type strain, as pointed by E-Volve, as well as an intensification of this effect by changes at the protein conformational equilibrium in solution. A local disorder of the loop α1'/β1', as well its possible effects on the affinity to the BD-368-2 antibody were also incorporated to the final conclusions after this analysis. Moreover, E-Volve can depict the main alterations in important biological structures, as shown in the SARS-CoV-2 complexes, marking a major step in the real-time tracking of the virus mutant lineages. E-Volve is available at http://bioinfo.dcc.ufmg.br/evolve.
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Affiliation(s)
- Vitor Pimentel Dos Santos
- Laboratory of Bioinformatics and Systems, Institute of Exact Sciences, Department of Computer Science, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - André Rodrigues
- Laboratory of Bioinformatics and Systems, Institute of Exact Sciences, Department of Computer Science, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Gabriel Dutra
- Laboratory of Bioinformatics and Systems, Institute of Exact Sciences, Department of Computer Science, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Luana Bastos
- Laboratory of Bioinformatics and Systems, Institute of Exact Sciences, Department of Computer Science, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Diego Mariano
- Laboratory of Bioinformatics and Systems, Institute of Exact Sciences, Department of Computer Science, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - José Gutembergue Mendonça
- Laboratory of Quantum and Computational Chemistry, Center of Exact and Natural Sciences, Department of Chemistry, Universidade Federal da Paraíba, João Pessoa, PB, Brazil
| | - Yan Jerônimo Gomes Lobo
- Laboratory of Molecular Modeling and Bioinformatics, Campus Sete Lagoas, Department of Exact and Biological Sciences, Universidade Federal de São João del-Rei, Sete Lagoas, MG, Brazil
| | - Eduardo Mendes
- Laboratory of Bioinformatics and Systems, Institute of Exact Sciences, Department of Computer Science, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Giovana Maia
- Laboratory of Bioinformatics and Systems, Institute of Exact Sciences, Department of Computer Science, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Karina dos Santos Machado
- Computational Biology Laboratory (ComBi-Lab), Center for Computational Sciences-C3, Universidade Federal do Rio Grande, Rio Grande, RS, Brazil
| | - Adriano Velasque Werhli
- Computational Biology Laboratory (ComBi-Lab), Center for Computational Sciences-C3, Universidade Federal do Rio Grande, Rio Grande, RS, Brazil
| | - Gerd Rocha
- Laboratory of Quantum and Computational Chemistry, Center of Exact and Natural Sciences, Department of Chemistry, Universidade Federal da Paraíba, João Pessoa, PB, Brazil
| | - Leonardo Henrique França de Lima
- Laboratory of Molecular Modeling and Bioinformatics, Campus Sete Lagoas, Department of Exact and Biological Sciences, Universidade Federal de São João del-Rei, Sete Lagoas, MG, Brazil
| | - Raquel de Melo-Minardi
- Laboratory of Bioinformatics and Systems, Institute of Exact Sciences, Department of Computer Science, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
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Bitard-Feildel T. Navigating the amino acid sequence space between functional proteins using a deep learning framework. PeerJ Comput Sci 2021; 7:e684. [PMID: 34616884 PMCID: PMC8459775 DOI: 10.7717/peerj-cs.684] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 07/30/2021] [Indexed: 06/13/2023]
Abstract
MOTIVATION Shedding light on the relationships between protein sequences and functions is a challenging task with many implications in protein evolution, diseases understanding, and protein design. The protein sequence space mapping to specific functions is however hard to comprehend due to its complexity. Generative models help to decipher complex systems thanks to their abilities to learn and recreate data specificity. Applied to proteins, they can capture the sequence patterns associated with functions and point out important relationships between sequence positions. By learning these dependencies between sequences and functions, they can ultimately be used to generate new sequences and navigate through uncharted area of molecular evolution. RESULTS This study presents an Adversarial Auto-Encoder (AAE) approached, an unsupervised generative model, to generate new protein sequences. AAEs are tested on three protein families known for their multiple functions the sulfatase, the HUP and the TPP families. Clustering results on the encoded sequences from the latent space computed by AAEs display high level of homogeneity regarding the protein sequence functions. The study also reports and analyzes for the first time two sampling strategies based on latent space interpolation and latent space arithmetic to generate intermediate protein sequences sharing sequential properties of original sequences linked to known functional properties issued from different families and functions. Generated sequences by interpolation between latent space data points demonstrate the ability of the AAE to generalize and produce meaningful biological sequences from an evolutionary uncharted area of the biological sequence space. Finally, 3D structure models computed by comparative modelling using generated sequences and templates of different sub-families point out to the ability of the latent space arithmetic to successfully transfer protein sequence properties linked to function between different sub-families. All in all this study confirms the ability of deep learning frameworks to model biological complexity and bring new tools to explore amino acid sequence and functional spaces.
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Affiliation(s)
- Tristan Bitard-Feildel
- IBPS, CNRS, Laboratoire de Biologie Computationnelle et Quantitative, Sorbonne Université, Paris, France
- Institut des Sciences du Calcul et de des Données (ISCD), Sorbonne Université, Paris, France
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Schaduangrat N, Malik AA, Nantasenamat C. ERpred: a web server for the prediction of subtype-specific estrogen receptor antagonists. PeerJ 2021; 9:e11716. [PMID: 34285834 PMCID: PMC8274494 DOI: 10.7717/peerj.11716] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Accepted: 06/11/2021] [Indexed: 11/22/2022] Open
Abstract
Estrogen receptors alpha and beta (ERα and ERβ) are responsible for breast cancer metastasis through their involvement of clinical outcomes. Estradiol and hormone replacement therapy targets both ERs, but this often leads to an increased risk of breast and endometrial cancers as well as thromboembolism. A major challenge is posed for the development of compounds possessing ER subtype specificity. Herein, we present a large-scale classification structure-activity relationship (CSAR) study of inhibitors from the ChEMBL database which consisted of an initial set of 11,618 compounds for ERα and 7,810 compounds for ERβ. The IC50 was selected as the bioactivity unit for further investigation and after the data curation process, this led to a final data set of 1,593 and 1,281 compounds for ERα and ERβ, respectively. We employed the random forest (RF) algorithm for model building and of the 12 fingerprint types, models built using the PubChem fingerprint was the most robust (Ac of 94.65% and 92.25% and Matthews correlation coefficient (MCC) of 89% and 76% for ERα and ERβ, respectively) and therefore selected for feature interpretation. Results indicated the importance of features pertaining to aromatic rings, nitrogen-containing functional groups and aliphatic hydrocarbons. Finally, the model was deployed as the publicly available web server called ERpred at http://codes.bio/erpred where users can submit SMILES notation as the input query for prediction of the bioactivity against ERα and ERβ.
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Affiliation(s)
- Nalini Schaduangrat
- Center of Data Mining and Biomedical Informatics, Faculty of Medical Technology, Mahidol University, Bangkok, Thailand
| | - Aijaz Ahmad Malik
- Center of Data Mining and Biomedical Informatics, Faculty of Medical Technology, Mahidol University, Bangkok, Thailand
| | - Chanin Nantasenamat
- Center of Data Mining and Biomedical Informatics, Faculty of Medical Technology, Mahidol University, Bangkok, Thailand
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Wang P, Zhang R, Yu S, Lee C, Wang H. Simulative structure and binding sites of lyral with olfactory receptor 10J5 using computational prediction methods. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2020; 83:1-8. [PMID: 32019422 DOI: 10.1080/15287394.2019.1706269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Olfactory receptor (OR) genes are extensively distributed throughout the human organism. Although these receptors are predominantly located in the olfactory epithelium, binding between odorant chemicals and corresponding ORs initiates downstream events in other tissues. In particular, exposure to allergen fragrances results in the induction of contact dermatitis. At present, current methodologies are limited in their ability to predict the consequences of fragrancy chemicals on humans. The aim of this study was designed to simulate the bindingstructure between lyral and OR10J5, a known allergen which produces contact dermatitis, and its corresponding OR OR10J5 in an effort to predict dermal outcomes using computational methods. Results demonstrated that binding between lyral and OR10J5 involved amino acid residues Phe104, Val105, Cyx178, Ile180, and Tyr258, respectively, which were located on binding sites of the receptor transmembrane 3(TM3), TM3, extracellular loop 2(EL2), EL2, TM6. Evidence indicates that computer simulating binding interactions occurred between an odorant chemical and its receptors which initiated downstream alterations accounting possibly for the observed in vivo contact dermatitis.
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Affiliation(s)
- Pu Wang
- School of Health Sciences, University of Newcastle, Newcastle, Australia
| | - Rui Zhang
- Xinjiang Laboratory of Minority Speech and Language Information Processing, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumchi, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Shunbang Yu
- School of Health Sciences, University of Newcastle, Newcastle, Australia
| | - Charles Lee
- School of Health Sciences, University of Newcastle Singapore Campus, Singapore
| | - He Wang
- School of Health Sciences, University of Newcastle, Newcastle, Australia
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Jafarian V, Bagheri K, Zarei J, Karami S, Ghanavatian P. Improved expression of recombinant sweet-tasting brazzein using codon optimization and host change as new strategies. FOOD BIOTECHNOL 2020. [DOI: 10.1080/08905436.2019.1711113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Vahab Jafarian
- Department of Biology, Faculty of science, University of Zanjan, Zanjan, Iran
| | - Khadijeh Bagheri
- Department of Plant Production and Genetics, Faculty of Agriculture, University of Zanjan, Zanjan, Iran
| | - Jabraeil Zarei
- Department of Plant Production and Genetics, Faculty of Agriculture, University of Zanjan, Zanjan, Iran
| | - Shima Karami
- Department of Plant Production and Genetics, Faculty of Agriculture, University of Zanjan, Zanjan, Iran
| | - Parisa Ghanavatian
- Department of Biology, Faculty of science, University of Zanjan, Zanjan, Iran
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Öztürk M, Önal C, Ba NM. Critical F129 and L138 in loop III of bile salt hydrolase (BSH) inLactobacillus plantarumB14 are essential for the catalytic activity and substrate specificity. FOOD BIOTECHNOL 2019. [DOI: 10.1080/08905436.2019.1673172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Mehmet Öztürk
- Department of Biology, Bolu Abant Izzet Baysal University, Bolu, Turkey
| | - Cansu Önal
- Department of Biology, Bolu Abant Izzet Baysal University, Bolu, Turkey
| | - Ndeye M. Ba
- Enstitute of Natural Science, Bolu Abant Izzet Baysal University, Bolu, Turkey
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The growth of amyloid fibrils: rates and mechanisms. Biochem J 2019; 476:2677-2703. [DOI: 10.1042/bcj20160868] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Revised: 09/08/2019] [Accepted: 09/10/2019] [Indexed: 12/19/2022]
Abstract
AbstractAmyloid fibrils are β-sheet-rich linear protein polymers that can be formed by a large variety of different proteins. These assemblies have received much interest in recent decades, due to their role in a range of human disorders. However, amyloid fibrils are also found in a functional context, whereby their structural, mechanical and thermodynamic properties are exploited by biological systems. Amyloid fibrils form through a nucleated polymerisation mechanism with secondary processes acting in many cases to amplify the number of fibrils. The filamentous nature of amyloid fibrils implies that the fibril growth rate is, by several orders of magnitude, the fastest step of the overall aggregation reaction. This article focusses specifically on in vitro experimental studies of the process of amyloid fibril growth, or elongation, and summarises the state of knowledge of its kinetics and mechanisms. This work attempts to provide the most comprehensive summary, to date, of the available experimental data on amyloid fibril elongation rate constants and the temperature and concentration dependence of amyloid fibril elongation rates. These data are compared with those from other types of protein polymers. This comparison with data from other polymerising proteins is interesting and relevant because many of the basic ideas and concepts discussed here were first introduced for non-amyloid protein polymers, most notably by the Japanese school of Oosawa and co-workers for cytoskeletal filaments.
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Fernández-Quintero ML, Kraml J, Georges G, Liedl KR. CDR-H3 loop ensemble in solution - conformational selection upon antibody binding. MAbs 2019; 11:1077-1088. [PMID: 31148507 PMCID: PMC6748594 DOI: 10.1080/19420862.2019.1618676] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
We analyzed pairs of protein-binding, peptide-binding and hapten-binding antibodies crystallized as complex and in the absence of the antigen with and without conformational differences upon binding in the complementarity-determining region (CDR)-H3 loop. Here, we introduce a molecular dynamics-based approach to capture a diverse conformational ensemble of the CDR-H3 loop in solution. The results clearly indicate that the inherently flexible CDR-H3 loop indeed needs to be characterized as a conformational ensemble. The conformational changes of the CDR-H3 loop in all antibodies investigated follow the paradigm of conformation selection, because we observe the experimentally determined binding competent conformation without the presence of the antigen within the ensemble of pre-existing conformational states in solution before binding. We also demonstrate for several examples that the conformation observed in the antibody crystal structure without antigen present is actually selected to bind the carboxyterminal tail region of the antigen-binding fragment (Fab). Thus, special care must be taken when characterizing antibody CDR-H3 loops by Fab X-ray structures, and the possibility that pre-existing conformations are present should always be considered.
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Affiliation(s)
- Monica L Fernández-Quintero
- a Institute of General, Inorganic and Theoretical Chemistry, and Center for Molecular Biosciences Innsbruck (CMBI), University of Innsbruck , Innsbruck , Austria
| | - Johannes Kraml
- a Institute of General, Inorganic and Theoretical Chemistry, and Center for Molecular Biosciences Innsbruck (CMBI), University of Innsbruck , Innsbruck , Austria
| | - Guy Georges
- b Roche Pharma Research and Early Development, Large Molecule Research, Roche Innovation Center Munich , Penzberg , Germany
| | - Klaus R Liedl
- a Institute of General, Inorganic and Theoretical Chemistry, and Center for Molecular Biosciences Innsbruck (CMBI), University of Innsbruck , Innsbruck , Austria
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von Ranke NL, Bello ML, Cabral LM, Castro HC, Rodrigues CR. Molecular modeling and dynamic simulations of agglutinin-like family members from Candida albicans: New insights into potential targets for the treatment of candidiasis. J Biomol Struct Dyn 2018; 36:4352-4365. [DOI: 10.1080/07391102.2017.1417159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Natalia L. von Ranke
- Instituto de Biologia, Universidade Federal Fluminense, 24210-130 Niterói, RJ, Brazil
- Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, 21941-902 Rio de Janeiro, RJ, Brazil
| | - Murilo L. Bello
- Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, 21941-902 Rio de Janeiro, RJ, Brazil
| | - Lucio M. Cabral
- Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, 21941-902 Rio de Janeiro, RJ, Brazil
| | - Helena C. Castro
- Instituto de Biologia, Universidade Federal Fluminense, 24210-130 Niterói, RJ, Brazil
| | - Carlos R. Rodrigues
- Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, 21941-902 Rio de Janeiro, RJ, Brazil
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Huang BCB, Kim YC, Bañas S, Barfield RM, Drake PM, Rupniewski I, Haskins WE, Rabuka D. Antibody-drug conjugate library prepared by scanning insertion of the aldehyde tag into IgG1 constant regions. MAbs 2018; 10:1182-1189. [PMID: 30252630 PMCID: PMC6284588 DOI: 10.1080/19420862.2018.1512327] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The advantages of site-specific over stochastic bioconjugation technologies include homogeneity of product, minimal perturbation of protein structure/function, and – increasingly – the ability to perform structure activity relationship studies at the conjugate level. When selecting the optimal location for site-specific payload placement, many researchers turn to in silico modeling of protein structure to identify regions predicted to offer solvent-exposed conjugatable sites while conserving protein function. Here, using the aldehyde tag as our site-specific technology platform and human IgG1 antibody as our target protein, we demonstrate the power of taking an unbiased scanning approach instead. Scanning insertion of the human formylglycine generating enzyme (FGE) recognition sequence, LCTPSR, at each of the 436 positions in the light and heavy chain antibody constant regions followed by co-expression with FGE yielded a library of antibodies bearing an aldehyde functional group ready for conjugation. Each of the variants was expressed, purified, and conjugated to a cytotoxic payload using the Hydrazinyl Iso-Pictet-Spengler ligation to generate an antibody-drug conjugate (ADC), which was analyzed in terms of conjugatability (assessed by drug-to-antibody ratio, DAR) and percent aggregate. We searched for insertion sites that could generate manufacturable ADCs, defined as those variants yielding reasonable antibody titers, DARs of ≥ 1.3, and ≥ 95% monomeric species. Through this process, we discovered 58 tag insertion sites that met these metrics, including 14 sites in the light chain, a location that had proved refractory to the placement of manufacturable tag sites using in silico modeling/rational approaches.
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McKinley BA, Casto AL, Rooney WL, Mullet JE. Developmental dynamics of stem starch accumulation in Sorghum bicolor. PLANT DIRECT 2018; 2:e00074. [PMID: 31245742 PMCID: PMC6508807 DOI: 10.1002/pld3.74] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Revised: 06/15/2018] [Accepted: 06/19/2018] [Indexed: 05/26/2023]
Abstract
Sweet sorghums were identified that accumulate up to ~9% of their total stem dry weight as starch. Starch accumulated preferentially in stem pith parenchyma in close proximity to vascular bundles. Stem starch accumulated slowly between floral initiation and anthesis and more rapidly between anthesis and 43 days post-anthesis before declining in parallel with tiller outgrowth. Genes involved in stem starch metabolism were identified through phylogenetic approaches and RNA-seq analysis of Della stem gene expression during the starch accumulation phase of development. Genes differentially expressed in stems were identified that are involved in starch biosynthesis (i.e., AGPase SS/LS, starch synthases, starch-branching enzymes), degradation (i.e., glucan-water dikinase, β-amylase, disproportionating enzyme, alpha-glucan phosphorylase) and amyloplast sugar transport (glucose-6-P translocator). Transcripts encoding AGPase SS and LS subunits with plastid localization were differentially induced during stem starch accumulation indicating that ADP-glucose for starch biosynthesis is primarily generated in stem plastids. Cytosolic heteroglucan metabolism may play a role in stem sucrose/starch accumulation because genes encoding cytosolic forms of the disproportionating enzyme and alpha-glucan phosphorylase were induced in parallel with stem sucrose/starch accumulation. Information on the stem starch pathway obtained in this study will be useful for engineering sorghum stems with elevated starch thereby improving forage quality and the efficiency of biomass conversion to biofuels and bio-products.
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Affiliation(s)
- Brian A. McKinley
- Department of Biochemistry and BiophysicsTexas A&M UniversityCollege StationTexas
| | - Anna L. Casto
- Department of Biochemistry and BiophysicsTexas A&M UniversityCollege StationTexas
| | - William L. Rooney
- Department of Soil and Crop SciencesTexas A&M UniversityCollege StationTexas
| | - John E. Mullet
- Department of Biochemistry and BiophysicsTexas A&M UniversityCollege StationTexas
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Mohammad T, Khan FI, Lobb KA, Islam A, Ahmad F, Hassan MI. Identification and evaluation of bioactive natural products as potential inhibitors of human microtubule affinity-regulating kinase 4 (MARK4). J Biomol Struct Dyn 2018; 37:1813-1829. [PMID: 29683402 DOI: 10.1080/07391102.2018.1468282] [Citation(s) in RCA: 101] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Microtubule affinity-regulating kinase 4 (MARK4) has recently been identified as a potential drug target for several complex diseases including cancer, diabetes and neurodegenerative disorders. Inhibition of MARK4 activity is an appealing therapeutic option to treat such diseases. Here, we have performed structure-based virtual high-throughput screening of 100,000 naturally occurring compounds from ZINC database against MARK4 to find its potential inhibitors. The resulted hits were selected, based on the binding affinities, docking scores and selectivity. Further, binding energy calculation, Lipinski filtration and ADMET prediction were carried out to find safe and better hits against MARK4. Best 10 compounds bearing high specificity and binding efficiency were selected, and their binding pattern to MARK4 was analyzed in detail. Finally, 100 ns molecular dynamics simulation was performed to evaluate; the dynamics stability of MARK4-compound complex. In conclusion, these selected natural compounds from ZINC database might be potential leads against MARK4, and can further be exploited in drug design and development for associated diseases.
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Affiliation(s)
- Taj Mohammad
- a Centre for Interdisciplinary Research in Basic Sciences , Jamia Millia Islamia , Jamia Nagar, New Delhi , 110025 , India
| | - Faez Iqbal Khan
- b Computational Mechanistic Chemistry and Drug Discovery , Rhodes University , Grahamstown , South Africa
| | - Kevin A Lobb
- b Computational Mechanistic Chemistry and Drug Discovery , Rhodes University , Grahamstown , South Africa
| | - Asimul Islam
- a Centre for Interdisciplinary Research in Basic Sciences , Jamia Millia Islamia , Jamia Nagar, New Delhi , 110025 , India
| | - Faizan Ahmad
- a Centre for Interdisciplinary Research in Basic Sciences , Jamia Millia Islamia , Jamia Nagar, New Delhi , 110025 , India
| | - Md Imtaiyaz Hassan
- a Centre for Interdisciplinary Research in Basic Sciences , Jamia Millia Islamia , Jamia Nagar, New Delhi , 110025 , India
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15
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Zhang Y, Gong W, Wang Y, Liu Y, Li C. Exploring movement and energy in human P-glycoprotein conformational rearrangement. J Biomol Struct Dyn 2018; 37:1104-1119. [PMID: 29620438 DOI: 10.1080/07391102.2018.1461133] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Human P-glycoprotein (P-gp), a kind of ATP-Binding Cassette transporter, can export a diverse variety of anti-cancer drugs out of the tumor cell. Its overexpression is one of the main reasons for the multidrug resistance (MDR) of tumor cells. It has been confirmed that during the substrate transport process, P-gp experiences a large-scale structural rearrangement from the inward- to outward-facing states. However, the mechanism of how the nucleotide-binding domains (NBDs) control the transmembrane domains (TMDs) to open towards the periplasm in the outward-facing state has not yet been fully characterized. Herein, targeted molecular dynamics simulations were performed to explore the conformational rearrangement of human P-gp. The results show that the allosteric process proceeds in a coupled way, and first the transition is driven by the NBDs, and then transmitted to the cytoplasmic parts of TMDs, finally to the periplasmic parts. The trajectories show that besides the translational motions, the NBDs undergo a rotation movement, which mainly occurs in xy plane and ensures the formation of the correct ATP-binding pockets. The analyses on the interaction energies between the six structure segments (cICLs) from the TMDs and NBDs reveal that their subtle energy differences play an important role in causing the periplasmic parts of the transmembrane helices to separate from each other in the established directions and in appropriate amplitudes. This conclusion can explain the two experimental phenomena about human P-gp in some extent. These studies have provided a detailed exploration into human P-gp rearrangement process and given an energy insight into the TMD reorientation during P-gp transition.
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Affiliation(s)
- Yue Zhang
- a College of Life Science and Bioengineering , Beijing University of Technology , Beijing , 100124 , China
| | - Weikang Gong
- a College of Life Science and Bioengineering , Beijing University of Technology , Beijing , 100124 , China
| | - Yan Wang
- b Key Laboratory of Molecular Biophysics of the Ministry of Education, School of Life Science and Technology , Huazhong University of Science and Technology , Wuhan , Hubei , 430074 , China
| | - Yang Liu
- a College of Life Science and Bioengineering , Beijing University of Technology , Beijing , 100124 , China
| | - Chunhua Li
- a College of Life Science and Bioengineering , Beijing University of Technology , Beijing , 100124 , China
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16
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周 雪, 夏 颖, 赵 岩, 古 文, 肖 潇, 白 晓, 刘 俊, 李 明. [Estradiol significantly increases the expression of antioxidant enzymes in osteoporotic rats and osteoblasts in vitro]. NAN FANG YI KE DA XUE XUE BAO = JOURNAL OF SOUTHERN MEDICAL UNIVERSITY 2018; 38:402-408. [PMID: 29735439 PMCID: PMC6765658 DOI: 10.3969/j.issn.1673-4254.2018.04.06] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 11/25/2017] [Indexed: 06/08/2023]
Abstract
OBJECTIVE To investigate the effect of estradiol on the expression of antioxidant enzymes in osteoblasts and its role in postmenopausal osteoporosis. METHODS Rat models of osteoporosis established by ovariectomy were treated with estradiol for 3 months, and the changes in serum levels of reactive oxygen species (H2O2) and antioxidant enzymes (γ -GCS, GSH-ST and GSH-px) were detected. The effects of estradiol on the expression of γ -GCS mRNA and protein in osteoblast-like cells MC3T3-E1, MG63 and OB were examined with PCR and Western blotting. Using a mRNA microarray, we analyzed the changes in the expressions of 84 antioxidant enzymes in the osteoblast cell line MC3T3-E1 following estradiol treatment, and the enzymes with significant changes were verified by PCR. CCK-8 kit was used to evaluate the effect of estradiol and antioxidant NAC on the proliferation of MC3T3-E1 cells. RESULTS Rat models of osteoporosis were successfully established with ovariectomy. The osteoporotic rats showed significantly increased serum level of reactive oxygen species (H2O2) and decreased levels of antioxidant enzymes. Estrogen treatment of the osteoporotic rats obviously reversed the phenotype of osteoporosis, lowered serum level of reactive oxygen species, and increased the level of γ -GCS. In MC3T3-E1, MG63 and OB cells, estradiol treatment significantly upregulated the expression levels of γ -GCS mRNA and protein. In MC3T3-E1 cells treated with estrogen, the mRNA chip identified 6 upregulated antioxidant enzymes (Gpx6, Gstk1, Nos2, Prdx2, Ngb and Ccs), and the results of PCR verified that estradiol upregulated Ccs and Ngb mRNAs in MC3T3-E1, MG63 and OB cells. Estradiol and antioxidant NAC obviously promoted the proliferation of MC3T3-E1 cells. CONCLUSION Estradiol significantly increases the expression of antioxidase γ -Gcs, Ccs and Ngb in osteoblasts in vitro. Postmenopausal osteoporosis is closely related with the increase of reactive oxygen species and the decrease of antioxidant levels. In osteoblasts, estrogen deficiency may increase the level of reactive oxygen species, decrease the level of antioxidant enzymes, activate the oxidative stress cascade, and consequently inhibit the proliferation of osteoblasts to aggravate the condition of osteoporosis.
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Affiliation(s)
- 雪娟 周
- 南方医科大学基础医学院细胞生物学教研室,广东 广州 510515Department of Cell Biology, Southern Medical University, Guangzhou 510515, China
| | - 颖 夏
- 南方医科大学基础医学院细胞生物学教研室,广东 广州 510515Department of Cell Biology, Southern Medical University, Guangzhou 510515, China
| | - 岩岩 赵
- 南方医科大学基础医学院细胞生物学教研室,广东 广州 510515Department of Cell Biology, Southern Medical University, Guangzhou 510515, China
| | - 文清 古
- 南方医科大学基础医学院细胞生物学教研室,广东 广州 510515Department of Cell Biology, Southern Medical University, Guangzhou 510515, China
| | - 潇 肖
- 南方医科大学基础医学院细胞生物学教研室,广东 广州 510515Department of Cell Biology, Southern Medical University, Guangzhou 510515, China
| | - 晓春 白
- 南方医科大学基础医学院细胞生物学教研室,广东 广州 510515Department of Cell Biology, Southern Medical University, Guangzhou 510515, China
| | - 俊 刘
- 广州军区广州总医院泌尿外科,广东 广州 510010Department of Urology, General Hospital of Guangzhou Military Area, Guangzhou 510010, China
| | - 明 李
- 南方医科大学基础医学院细胞生物学教研室,广东 广州 510515Department of Cell Biology, Southern Medical University, Guangzhou 510515, China
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Kazi A, Chuah C, Majeed ABA, Leow CH, Lim BH, Leow CY. Current progress of immunoinformatics approach harnessed for cellular- and antibody-dependent vaccine design. Pathog Glob Health 2018. [PMID: 29528265 DOI: 10.1080/20477724.2018.1446773] [Citation(s) in RCA: 71] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
Abstract
Immunoinformatics plays a pivotal role in vaccine design, immunodiagnostic development, and antibody production. In the past, antibody design and vaccine development depended exclusively on immunological experiments which are relatively expensive and time-consuming. However, recent advances in the field of immunological bioinformatics have provided feasible tools which can be used to lessen the time and cost required for vaccine and antibody development. This approach allows the selection of immunogenic regions from the pathogen genomes. The ideal regions could be developed as potential vaccine candidates to trigger protective immune responses in the hosts. At present, epitope-based vaccines are attractive concepts which have been successfully trailed to develop vaccines which target rapidly mutating pathogens. In this article, we provide an overview of the current progress of immunoinformatics and their applications in the vaccine design, immune system modeling and therapeutics.
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Affiliation(s)
- Ada Kazi
- a Institute for Research in Molecular Medicine (INFORMM) , Universiti Sains Malaysia , Kelantan , Malaysia.,b School of Health Sciences , Universiti Sains Malaysia , Kelantan , Malaysia
| | - Candy Chuah
- c School of Medical Sciences , Universiti Sains Malaysia , Kelantan , Malaysia
| | | | - Chiuan Herng Leow
- d Institute for Research in Molecular Medicine (INFORMM) , Universiti Sains Malaysia , Penang , Malaysia
| | - Boon Huat Lim
- b School of Health Sciences , Universiti Sains Malaysia , Kelantan , Malaysia
| | - Chiuan Yee Leow
- a Institute for Research in Molecular Medicine (INFORMM) , Universiti Sains Malaysia , Kelantan , Malaysia
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18
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Raghuraman P, Sudandiradoss C. R516Q mutation in Melanoma differentiation-associated protein 5 (MDA5) and its pathogenic role towards rare Singleton-Merten syndrome; a signature associated molecular dynamics study. J Biomol Struct Dyn 2018; 37:750-765. [DOI: 10.1080/07391102.2018.1439770] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- P. Raghuraman
- Department of Biotechnology, School of Bioscience and Technology, VIT University, Vellore 632014, India
| | - C. Sudandiradoss
- Department of Biotechnology, School of Bioscience and Technology, VIT University, Vellore 632014, India
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19
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Targowska-Duda KM, Kaczor AA, Jozwiak K, Arias HR. Molecular interactions of type I and type II positive allosteric modulators with the human α7 nicotinic acetylcholine receptor: an in silico study. J Biomol Struct Dyn 2018; 37:411-439. [PMID: 29363414 DOI: 10.1080/07391102.2018.1427634] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The binding site locations and structural components for type I and type II positive allosteric modulators (PAMs) of the α7 nicotinic acetylcholine receptor (nAChR) have not been fully characterized yet. In this regard, homology models of the human α7 nAChR and hα7/m5-HT3A chimera, built using the crystal structure of the serotonin type 3A receptor (5-ΗΤ3ΑR), were used for molecular docking and molecular dynamics simulations to study the molecular interactions of selected type I (5-hydroxyindol, NS-1738, and LY-2087101) and type II (PNU-120596, PAM-2, and TBS-516) PAMs. The docking results indicate: (1) a site located in the extracellular domain (ECD) for type I PAMs such as NS-1738 and LY-2087101, but not for 5-HI; (2) an overlapping site in the ECD-transmembrane domain (TMD) junction for all studied PAMs. Additional docking results on the hα7/m5-HT3A chimera supported experimental results indicating that the ECD site might be relevant for type I PAM activity; and (3) two TMD sites, an intrasubunit site that recognizes type II PAMs, and an intersubunit pocket with high specificity for 5-HI (type I PAM). The in silico α7TSLMF mutant results support the view that M1-Ser223 and M3-Ile281 are key residues for the interaction of PAM-2 and PNU-120596 with the intrasubunit cavity. Our in silico results are in agreement with experimental data showing that the intrasubunit cavity is relevant for the activity of type II PAMs, and suggest that the ECD-TMD junction and intersubunit sites could be significant for the activity of type I PAMs.
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Affiliation(s)
| | - Agnieszka A Kaczor
- b Department of Synthesis and Chemical Technology of Pharmaceutical Substances with Computer Modeling Lab , Medical University of Lublin , Lublin , Poland.,c School of Pharmacy , University of Eastern Finland , Kuopio , Finland
| | - Krzysztof Jozwiak
- a Department of Biopharmacy , Medical University of Lublin , Lublin , Poland
| | - Hugo R Arias
- d Department of Basic Sciences , California Northstate University College of Medicine , Elk Grove , CA , USA
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20
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Smith BA, Mottishaw CR, Hendricks AJ, Mitchell J, Becker S, Ropski PS, Park B, Finkbeiner-Caufield M, Garay-Nontol B, Holman RW, Rodnick KJ. Potential roles of inorganic phosphate on the progression of initially bound glucopyranose toward the nonenzymatic glycation of human hemoglobin: mechanistic diversity and impacts on site selectivity. ACTA ACUST UNITED AC 2018; 4. [PMID: 30918913 PMCID: PMC6433390 DOI: 10.1080/23312025.2018.1425196] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Nonenzymatic glycation (NEG) begins with the non-covalent binding of a glucopyranose to a protein. The bound glucopyranose must then undergo structural modification to generate a bound electrophile that can reversibly form a Schiff base, which can then lead to Amadori intermediates, and ultimately to glycated proteins. Inorganic phosphate (Pi) is known to accelerate the glycation of human hemoglobin (HbA), although the specific mechanism(s) of Pi as an effector reagent have not been determined. The aim of this study was to determine whether Pi and a glucopyranose can concomitantly bind to HbA and react while bound within the early, noncovalent stages to generate electrophilic species capable of progress in NEG. 31P and 1HNMR of model reactions confirm that bimolecular reactions between Pi and glucopyranose occur generating modified glucose electrophiles. Computations of protein/substrate interactions predict that Pi can concomitantly bind with a glucopyranose in HbA pockets with geometries suitable for multiple acid/base mechanisms that can generate any of four transient electrophiles. Pi-facilitated mechanisms in the noncovalent stages predict that the glycation of β-Val1 of HbA to HbA1c is a “hot spot” because the β-Val1 pocket facilitates many more mechanisms than any other site. The mechanistic diversity of the Pi effect within the early noncovalent stages of NEG predicts well the overall site selectivity observed from the in vivo glycation of HbA in the presence of Pi. These insights extend our basic understanding of the NEG process and may have clinical implications for diabetes mellitus and even normal aging.
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Affiliation(s)
- Brandy A Smith
- Department of Chemistry, Idaho State University Pocatello, Idaho 83209.,Department of Biological Sciences, Idaho State University Pocatello, Idaho 83209
| | | | | | - Jason Mitchell
- Department of Chemistry, Idaho State University Pocatello, Idaho 83209
| | - Stephanie Becker
- Department of Chemistry, Idaho State University Pocatello, Idaho 83209
| | - Pamela S Ropski
- Department of Chemistry, Idaho State University Pocatello, Idaho 83209
| | - Bomina Park
- Department of Chemistry, Idaho State University Pocatello, Idaho 83209
| | | | | | - R W Holman
- Department of Chemistry, Idaho State University Pocatello, Idaho 83209
| | - Kenneth J Rodnick
- Department of Biological Sciences, Idaho State University Pocatello, Idaho 83209
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21
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Liao JM, Wang YT. In silico studies of conformational dynamics of Mu opioid receptor performed using gaussian accelerated molecular dynamics. J Biomol Struct Dyn 2018; 37:166-177. [DOI: 10.1080/07391102.2017.1422025] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Jun-Min Liao
- Center for Biomarkers and Biotech Drugs, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Yeng-Tseng Wang
- Center for Biomarkers and Biotech Drugs, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Biochemistry, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
- Graduate Institute of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
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22
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Jitonnom J, Hannongbua S. Theoretical study of the arabinan hydrolysis by an inverting GH43 arabinanase. MOLECULAR SIMULATION 2018. [DOI: 10.1080/08927022.2017.1422212] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Jitrayut Jitonnom
- Division of Chemistry, School of Science, University of Phayao, Phayao, Thailand
| | - Supa Hannongbua
- Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok, Thailand
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23
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Tompa DR, Kadhirvel S. Molecular dynamics of a far positioned SOD1 mutant V14M reveals pathogenic misfolding behavior. J Biomol Struct Dyn 2017; 36:4085-4098. [PMID: 29157189 DOI: 10.1080/07391102.2017.1407675] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Human superoxide dismutase (Cu/Zn SOD1) is a homodimeric enzyme. Mutations in Cu/Zn SOD1 causes a familial form of amyotrophic lateral sclerosis (fALS), and aggregation of mutant SOD1 has been proposed to play a role in neurodegeneration. Though a majority of the mutations are point substitutions, there are a few changes that result in amino acid deletions or truncations of the polypeptide. These pathogenic mutations are scattered throughout the three-dimensional structure of the dimeric enzyme, which creates a puzzling pattern to investigate the molecular determinants of fALS. The most common hypothesis proposed that the misfolding of SOD1 mutants are primarily triggered by decreased affinity for metal ions. However, this hypothesis is challenging, as a significant number of disease-causing mutations are located far away from the metal-binding site and dimer interface. So in the present study, we have investigated the influence of such a far positioned pathogenic mutation, V14M, in altering the stability and folding of the Cu/Zn SOD1. Though the location of Val14 is far positioned, it has a vital role in the stability of SOD1 by preserving its hydrophobic cluster at one end of the β barrel domain. We have performed MD simulations of the V14M mutant for 80 ns timescale. The results reveal the fact that irrespective of its location, V14M mutation triggers a conformational change that is more similar to that of the metal-deficient holo form and could resemble an intermediate state in the folding reaction which results in protein misfolding and aggregation.
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Affiliation(s)
- Dharma Rao Tompa
- a Biomolecular Crystallography Laboratory, Department of Bioinformatics, School of Chemical and Biotechnology , SASTRA University , Thanjavur 613 401 , India
| | - Saraboji Kadhirvel
- a Biomolecular Crystallography Laboratory, Department of Bioinformatics, School of Chemical and Biotechnology , SASTRA University , Thanjavur 613 401 , India
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Milenkovic J, Milojkovic M, Jevtovic Stoimenov T, Djindjic B, Miljkovic E. Mechanisms of plasminogen activator inhibitor 1 action in stromal remodeling and related diseases. Biomed Pap Med Fac Univ Palacky Olomouc Czech Repub 2017; 161:339-347. [PMID: 29097819 DOI: 10.5507/bp.2017.046] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2017] [Accepted: 10/20/2017] [Indexed: 01/11/2023] Open
Abstract
Plasminogen activator inhibitor type 1 (PAI-1) is the main physiologic inhibitor of fibrinolysis. However, it is also involved in many physiological processes such as extracellular matrix (ECM) proteolysis and remodeling, cell adhesion, motility, and apoptosis, angiogenesis, etc. The aim of the study was to summarize current knowledge and gain insights into the mechanisms of PAI-1 action in the processes of stromal remodeling and diseases with considerable matrix pathologies (atherosclerosis, tissue fibrosis, cancer metastasis, pregnancy related complications, etc). As a component of an early cellular response to injury, PAI-1 reacts with membrane surface proteins and participates in the initiation of intracellular signaling, specifically cytoskeletal reorganization and motility. Complexity of ECM homeostasis resides in varying relation of the plasminogen system components and other matrix constituents. Inflammatory mediators (transforming growth factor-β and interferon-γ) and hormones (angiotensin II) are in the close interdependent relation with PAI-1. Also, special attention is devoted to the role of increased PAI-1 concentrations due to the common 4G/5G polymorphism. Some of the novel mechanisms of ECM modification consider PAI-1 dependent stabilization of urokinase mediated cell adhesion, control of the vascular endothelial cadherin trafficking and interaction with endothelial cells proteasome, its relation to matrix metalloproteinase 2 and osteopontin, and oxidative inhibition by myeloperoxidase. Targeting and/or alteration of PAI-1 functions might bring benefit to the future therapeutic approaches in diseases where ECM undergoes substantial remodeling.
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Affiliation(s)
- Jelena Milenkovic
- Institute of Pathophysiology, Faculty of Medicine University of Nis, Serbia
| | - Maja Milojkovic
- Institute of Pathophysiology, Faculty of Medicine University of Nis, Serbia
| | | | - Boris Djindjic
- Institute of Pathophysiology, Faculty of Medicine University of Nis, Serbia
| | - Edita Miljkovic
- Hematology and Clinical Immunology Clinic, Clinical Center in Nis, Serbia
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25
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Kabir MZ, Ghani H, Mohamad SB, Alias Z, Tayyab S. Interactive association between RhoA transcriptional signaling inhibitor, CCG1423 and human serum albumin: Biophysical and in silico studies. J Biomol Struct Dyn 2017; 36:2495-2507. [DOI: 10.1080/07391102.2017.1360207] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Md. Zahirul Kabir
- Biomolecular Research Group, Biochemistry Programme, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Hamidah Ghani
- Bioinformatics Programme, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Saharuddin B. Mohamad
- Bioinformatics Programme, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
- Centre of Research for Computational Sciences and Informatics for Biology, Bioindustry, Environment, Agriculture and Healthcare, University of Malaya, Kuala Lumpur, Malaysia
| | - Zazali Alias
- Biomolecular Research Group, Biochemistry Programme, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Saad Tayyab
- Biomolecular Research Group, Biochemistry Programme, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
- Centre of Research for Computational Sciences and Informatics for Biology, Bioindustry, Environment, Agriculture and Healthcare, University of Malaya, Kuala Lumpur, Malaysia
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26
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Xue YL, Wang H, Riedy M, Roberts BL, Sun Y, Song YB, Jones GW, Masison DC, Song Y. Molecular dynamics simulations of Hsp40 J-domain mutants identifies disruption of the critical HPD-motif as the key factor for impaired curing in vivo of the yeast prion [URE3]. J Biomol Struct Dyn 2017; 36:1764-1775. [PMID: 28766406 DOI: 10.1080/07391102.2017.1334594] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Genetic screens using Saccharomyces cerevisiae have identified an array of Hsp40 (Ydj1p) J-domain mutants that are impaired in the ability to cure the yeast [URE3] prion through disrupting functional interactions with Hsp70. However, biochemical analysis of some of these Hsp40 J-domain mutants has so far failed to provide major insight into the specific functional changes in Hsp40-Hsp70 interactions. To explore the detailed structural and dynamic properties of the Hsp40 J-domain, 20 ns molecular dynamic simulations of 4 mutants (D9A, D36A, A30T, and F45S) and wild-type J-domain were performed, followed by Hsp70 docking simulations. Results demonstrated that although the Hsp70 interaction mechanism of the mutants may vary, the major structural change was targeted to the critical HPD motif of the J-domain. Our computational analysis fits well with previous yeast genetics studies regarding highlighting the importance of J-domain function in prion propagation. During the molecular dynamics simulations several important residues were identified and predicted to play an essential role in J-domain structure. Among these residues, Y26 and F45 were confirmed, using both in silico and in vivo methods, as being critical for Ydj1p function.
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Affiliation(s)
- You-Lin Xue
- a School of Environmental Science, Liaoning University , Shenyang , China.,d Light Industry College, Liaoning University , Shenyang , China
| | - Hao Wang
- a School of Environmental Science, Liaoning University , Shenyang , China
| | - Michael Riedy
- b Laboratory of Biochemistry and Genetics , National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health , Bethesda , MD , USA
| | - Brittany-Lee Roberts
- b Laboratory of Biochemistry and Genetics , National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health , Bethesda , MD , USA
| | - Yuna Sun
- a School of Environmental Science, Liaoning University , Shenyang , China
| | - Yong-Bo Song
- e School of Life Science and Biopharmaceutics, Shenyang Pharmaceutical University , Shenyang , China
| | - Gary W Jones
- c National University of Ireland Maynooth , Maynooth , Ireland
| | - Daniel C Masison
- b Laboratory of Biochemistry and Genetics , National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health , Bethesda , MD , USA
| | - Youtao Song
- a School of Environmental Science, Liaoning University , Shenyang , China
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27
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Sang P, Hu W, Ye YJ, Li LH, Zhang C, Xie YH, Meng ZH. In silico screening, molecular docking, and molecular dynamics studies of SNP-derived human P5CR mutants. J Biomol Struct Dyn 2017; 35:2441-2453. [PMID: 27677826 DOI: 10.1080/07391102.2016.1222967] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Accepted: 08/07/2016] [Indexed: 01/13/2023]
Abstract
Pyrroline-5-carboxylate reductase (P5CR) encoded by PYCR1 gene is a housekeeping enzyme that catalyzes the reduction of P5C to proline using NAD(P)H as the cofactor. In this study, we used in silico approaches to examine the role of nonsynonymous single-nucleotide polymorphisms in the PYCR1 gene and their putative functions in the pathogenesis of Cutis Laxa. Among the 348 identified SNPs, 15 were predicted to be potentially damaging by both SIFT and PolyPhen tools; of them two SNP-derived mutations, R119G and G206W, have been previously reported to correlate with Cutis Laxa. These two mutations were therefore selected to be mapped to the wild-type (WT) P5CR structure for further structural and functional analyses. The results of comparative computational analyses using I-Mutant and Autodock reveal reductions in both stability and cofactor binding affinity of these two mutants. Comparative molecular dynamics (MD) simulations were performed to evaluate the changes in dynamic properties of P5CR upon mutations. The results reveal that the two mutations enhance the rigidity of P5CR structure, especially that of cofactor binding site, which could result in decreased kinetics of cofactor entrance and egress. Comparison between the structural properties of the WT and mutants during MD simulations shows that the enhanced rigidity of mutants results most likely from the increased number of inter-atomic interactions and the decreased number of dynamic hydrogen bonds. Our study provides novel insight into the deleterious effects of the R119G and G206W mutations on P5CR, and sheds light on the mechanisms by which these mutations mediate Cutis Laxa.
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Affiliation(s)
- Peng Sang
- a Laboratory of Molecular Cardiology, Department of Cardiology , The First Affiliated Hospital of Kunming Medical University , Kunming , P.R. China
| | - Wei Hu
- a Laboratory of Molecular Cardiology, Department of Cardiology , The First Affiliated Hospital of Kunming Medical University , Kunming , P.R. China
| | - Yu-Jia Ye
- a Laboratory of Molecular Cardiology, Department of Cardiology , The First Affiliated Hospital of Kunming Medical University , Kunming , P.R. China
| | - Lin-Hua Li
- a Laboratory of Molecular Cardiology, Department of Cardiology , The First Affiliated Hospital of Kunming Medical University , Kunming , P.R. China
| | - Chao Zhang
- a Laboratory of Molecular Cardiology, Department of Cardiology , The First Affiliated Hospital of Kunming Medical University , Kunming , P.R. China
| | - Yue-Hui Xie
- b Department of Computer Science, The Faculty of Basic Medicine , Kunming Medical University , Kunming , P.R China
| | - Zhao-Hui Meng
- a Laboratory of Molecular Cardiology, Department of Cardiology , The First Affiliated Hospital of Kunming Medical University , Kunming , P.R. China
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Yellapu NK, Gopal J, Kasinathan G, Purushothaman J. Molecular modelling studies of kdr mutations in voltage gated sodium channel revealed significant conformational variations contributing to insecticide resistance. J Biomol Struct Dyn 2017; 36:2058-2069. [PMID: 28608751 DOI: 10.1080/07391102.2017.1341338] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Voltage gated sodium channels (VGSC) of mosquito vectors are the primary targets of dichlorodiphenyltrichloroethane (DDT) and other synthetic pyrethroids used in public health programmes. The knockdown resistant (kdr) mutations in VGSC are associated with the insecticide resistance especially in Anophelines. The present study is aimed to emphasize and demarcate the impact of three kdr-mutations such as L1014S, L1014F and L1014H on insecticide resistance. The membrane model of sodium transport domain of VGSC (STD-VGSC) was constructed using de novo approach based on domain and trans-membrane predictions. The comparative molecular modelling studies of wild type and mutant models of STD-VGSC revealed that L1014F mutant was observed to be near native to the wild type model in all the respects, but, L1014S and L1014H mutations showed drastic variations in the energy levels, root mean square fluctuations (RMSF) that resulted in conformational variations. The predicted binding sites also showed variable cavity volumes and RMSF in L1014S and L1014H mutants. Further, DDT also found be bound in near native manner to wild type in L1014F mutant and with variable orientation and affinities in L1014S and L1014H mutants. The variations and fluctuations observed in mutant structures explained that each mutation has its specific impact on the conformation of VGSC and its binding with DDT. The study provides new insights into the structure-function-correlations of mutant STD-VGSC structures and demonstrates the role and effects of kdr mutations on insecticide resistance in mosquito vectors.
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Affiliation(s)
- Nanda Kumar Yellapu
- a Biomedical Informatics Centre, Vector Control Research Centre, Indian Council of Medical Research , Puducherry 605006 , India
| | - Jeyakodi Gopal
- a Biomedical Informatics Centre, Vector Control Research Centre, Indian Council of Medical Research , Puducherry 605006 , India
| | - Gunasekaran Kasinathan
- a Biomedical Informatics Centre, Vector Control Research Centre, Indian Council of Medical Research , Puducherry 605006 , India
| | - Jambulingam Purushothaman
- a Biomedical Informatics Centre, Vector Control Research Centre, Indian Council of Medical Research , Puducherry 605006 , India
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29
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Goswami N, Hussain MI, Borah P. Molecular dynamics approach to probe the antigenicity of PagN - an outer membrane protein of Salmonella Typhi. J Biomol Struct Dyn 2017; 36:2131-2146. [PMID: 28617661 DOI: 10.1080/07391102.2017.1343156] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
PagN is a highly immunogenic 27-kDa outer membrane adhesin present in Salmonella Typhi. It plays a major role in the pathogenesis of typhoid fever and has emerged as a strong vaccine candidate. In this report, we predict the three-dimensional structure of PagN and describe the conformational dynamics associated with its four extracellular loops based on two 100-ns molecular dynamics simulations at 300 and 310 K. The formation and deformation of the secondary structures on these loops were also investigated during the simulations which revealed loops L1 and L2 to be highly flexible, whereas the relative flexibility of loops L3 and L4 was minimal. Essential dynamics and principal component analysis deciphered more realistic dynamic behaviours of the loops, particularly at 310 K. Moreover, our epitope predictions suggest that the antigenic peptides for B-cell recognition are located within the loops L1 and L2, while those for T-cell recognition are located within the loops L3 and L4. The binding specificities of the antigenic peptides towards specific human MHC-I and MHC-II HLA alleles closely resembled the stability of the loops L3 and L4 inferred from the simulations. Finally, we identified potential antigenic peptides in the flexible (L1 and L2) as well as stable (L3 and L4) regions of PagN for both B- and T-cell recognitions, which can help in developing effective sub-unit vaccines.
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Affiliation(s)
- Nabajyoti Goswami
- a Bioinformatics Infrastructure Facility , College of Veterinary Science, Assam Agricultural University , Khanapara, Guwahati 781022 , Assam , India
| | - Md Iftikar Hussain
- b State Biotech Hub (Assam), College of Veterinary Science, Assam Agricultural University , Khanapara, Guwahati 781022 , Assam , India
| | - Probodh Borah
- a Bioinformatics Infrastructure Facility , College of Veterinary Science, Assam Agricultural University , Khanapara, Guwahati 781022 , Assam , India.,b State Biotech Hub (Assam), College of Veterinary Science, Assam Agricultural University , Khanapara, Guwahati 781022 , Assam , India
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30
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Singh G, Singh V. Functional elucidation of hypothetical proteins for their indispensable roles toward drug designing targets from Helicobacter pylori strain HPAG1. J Biomol Struct Dyn 2017; 36:906-918. [DOI: 10.1080/07391102.2017.1302361] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Gagandeep Singh
- Centre for Computational Biology and Bioinformatics, School of Life Sciences, Central University of Himachal Pradesh, TAB, Shahpur 176206, India
| | - Vikram Singh
- Centre for Computational Biology and Bioinformatics, School of Life Sciences, Central University of Himachal Pradesh, TAB, Shahpur 176206, India
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31
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Sonati S, Bhutoria S, Prabhakaran M, Acharya SA. Influence of semisynthetic modification of the scaffold of a contact domain of HbS on polymerization: role of flexible surface topology in polymerization inhibition. J Biomol Struct Dyn 2017; 36:689-700. [PMID: 28278759 DOI: 10.1080/07391102.2017.1294111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
A new variant of HbS, HbS-Einstein with a deletion of segment α23-26 in the B-helix, has been assembled by semisynthetic approach. B-helix of the α chain of cis αβ-dimer of HbS plays dominant role in the quinary interactions of deoxy HbS dimer. This B-helix is the primary scaffold that provides the orientation for the side chains of contact residues of this intermolecular contact domain. The design of HbS-Einstein has been undertaken to map the influence of perturbation of molecular surface topology and the flexibility of surface residues in the polymerization. The internal deletion exerts a strong inhibitory influence on Val-6 (β)-dependent polymerization, comparable to single contact site mutations and not for complete neutralization of Val-6(β)-dependent polymerization. The scaffold modification in cis-dimer is inhibitory, and is without any effect when present on the trans dimer. The flexibility changes in the surface topology in the region of scaffold modification apparently counteracts the intrinsic polymerization potential of the molecule. The inhibition is close to that of Le Lamentin mutation [His-20 (α) → Gln] wherein a mutation engineered without much change in flexibility of the contact domain. Interestingly, the chimeric HbS with swine-human chimeric α chain with multiple non-conservative mutations completely inhibits the Val-6(β)-dependent polymerization. The deformabilities of surface topology of chimeric HbS are comparable to HbS in spite of the multiple contact site mutations in the α-chain. We conclude that the design of antisickling Hbs for gene therapy of sickle cell disease should involve multiple mutations of intermolecular contact sites.
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Affiliation(s)
- Srinivasulu Sonati
- a Division of Hematology , Albert Einstein College of Medicine , 1300 Morris Park Avenue, Bronx, New York 10461 , USA
| | - Savita Bhutoria
- a Division of Hematology , Albert Einstein College of Medicine , 1300 Morris Park Avenue, Bronx, New York 10461 , USA
| | - Muthuchidambaran Prabhakaran
- a Division of Hematology , Albert Einstein College of Medicine , 1300 Morris Park Avenue, Bronx, New York 10461 , USA
| | - Seetharama A Acharya
- a Division of Hematology , Albert Einstein College of Medicine , 1300 Morris Park Avenue, Bronx, New York 10461 , USA.,b Department(s) of Medicine and of Physiology and Biophysics , Albert Einstein College of Medicine , 1300 Morris Park Avenue, Bronx, New York 10461 , USA
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Sharifi M, Dolatabadi JEN, Fathi F, Rashidi M, Jafari B, Tajalli H, Rashidi MR. Kinetic and thermodynamic study of bovine serum albumin interaction with rifampicin using surface plasmon resonance and molecular docking methods. JOURNAL OF BIOMEDICAL OPTICS 2017; 22:37002. [PMID: 28253382 DOI: 10.1117/1.jbo.22.3.037002] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Accepted: 02/10/2017] [Indexed: 06/06/2023]
Abstract
The interaction of bovine serum albumin (BSA) with various drugs, such as antibiotics, due to the importance of BSA in drug delivery has attracted increasing research attention at present. Therefore, the aim of this study was investigation of BSA interaction with rifampicin using surface plasmon resonance (SPR) and molecular docking methods under the imitated physiological conditions ( pH = 7.4 ). BSA immobilization on carboxymethyl dextran hydrogel chip has been carried out after activation with N-hydroxysuccinimide/N-ethyl-N-(3-diethylaminopropyl) carbodiimide. The dose-response sensorgrams of BSA upon increasing concentration of refampicin were attained in SPR analysis. The high affinity of rifampicin to BSA was demonstrated by a low equilibrium constants ( K D ) value ( 3.46 × 10 ? 5 at 40°C). The process of kinetic values changing shows that affinity of BSA to rifampicin decreased with rising temperature. The positive value of both enthalpy change ( ? H ) and entropy change ( ? S ) showed that hydrophobic force plays major role in the BSA interaction with rifampicin. The positive value of ? G was indicative of nonspontaneous and enthalpy-driven binding process. In addition, according to the molecular docking study, hydrogen binding has some contributions in the interaction of rifampicin with BSA.
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Affiliation(s)
- Maryam Sharifi
- University of Tabriz, Research Institute for Applied Physics and Astronomy, Tabriz, Iran
| | - Jafar Ezzati Nazhad Dolatabadi
- Tabriz University of Medical Sciences, Research Center for Pharmaceutical Nanotechnology, Faculty of Pharmacy, Tabriz, Iran
| | - Farzaneh Fathi
- Tabriz University of Medical Sciences, Research Center for Pharmaceutical Nanotechnology, Faculty of Pharmacy, Tabriz, IrancTabriz University of Medical Sciences, Student Research Committee, Tabriz, Iran
| | - Mohammad Rashidi
- Tabriz University of Medical Sciences, Research Center for Pharmaceutical Nanotechnology, Faculty of Pharmacy, Tabriz, Iran
| | - Behzad Jafari
- Tabriz University of Medical Sciences, Biotechnology Research Center, Tabriz, Iran
| | - Habib Tajalli
- University of Tabriz, Research Institute for Applied Physics and Astronomy, Tabriz, Iran
| | - Mohammad-Reza Rashidi
- Tabriz University of Medical Sciences, Research Center for Pharmaceutical Nanotechnology, Faculty of Pharmacy, Tabriz, Iran
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Awasthi M, Singh S, Pandey VP, Dwivedi UN. Modulation in the conformational and stability attributes of the Alzheimer's disease associated amyloid-beta mutants and their favorable stabilization by curcumin: molecular dynamics simulation analysis. J Biomol Struct Dyn 2017; 36:407-422. [PMID: 28054501 DOI: 10.1080/07391102.2017.1279078] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Alzheimer's disease (AD) is a neurodegenerative disorder characterized by progressive accumulation of amyloid-beta (Aβ) peptides in brain. In the present study, two familial Aβ42 mutations, namely A2V (harmful) and A2T (protective) have been analyzed and compared with the wild-type (WT) by performing all-atom molecular dynamics (MD) simulations in the absence and presence of curcumin, a well-known inhibitor of Aβ plaque formation. Mutant A2V was found to exhibit highest stability followed by WT and mutant A2T in the absence of curcumin. This stability trend was found to be reversed in the presence of curcumin, suggesting a significant change in the conformational landscape of Aβ42 folding. Due to significant differences in the folding and interaction patterns of the mutants A2V and A2T, curcumin exhibited higher binding affinity for mutant A2T as compared to that of A2V. To the best of our knowledge, this is the first report on the effect of curcumin binding on structural landscapes of the two contrasting point mutants providing an understanding of the basis of Aβ plaque formation and its prevention by curcumin.
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Affiliation(s)
- Manika Awasthi
- a Bioinformatics Infrastructure Facility, Center of Excellence in Bioinformatics, Department of Biochemistry , University of Lucknow , Lucknow 226007 , India
| | - Swati Singh
- a Bioinformatics Infrastructure Facility, Center of Excellence in Bioinformatics, Department of Biochemistry , University of Lucknow , Lucknow 226007 , India
| | - Veda P Pandey
- a Bioinformatics Infrastructure Facility, Center of Excellence in Bioinformatics, Department of Biochemistry , University of Lucknow , Lucknow 226007 , India
| | - Upendra N Dwivedi
- a Bioinformatics Infrastructure Facility, Center of Excellence in Bioinformatics, Department of Biochemistry , University of Lucknow , Lucknow 226007 , India
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34
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Tavassoli Z, Taghdir M, Ranjbar B. Renin inhibition by soyasaponin I: a potent native anti-hypertensive compound. J Biomol Struct Dyn 2017; 36:166-176. [DOI: 10.1080/07391102.2016.1270855] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Zeinab Tavassoli
- Department of Biophysics, Tarbiat Modares University, Tehran, Iran
| | - Majid Taghdir
- Department of Biophysics, Tarbiat Modares University, Tehran, Iran
| | - Bijan Ranjbar
- Department of Biophysics, Tarbiat Modares University, Tehran, Iran
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35
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Swanson J, Audie J. An unexpected way forward: towards a more accurate and rigorous protein-protein binding affinity scoring function by eliminating terms from an already simple scoring function. J Biomol Struct Dyn 2016; 36:83-97. [PMID: 27989231 DOI: 10.1080/07391102.2016.1268974] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
A fundamental and unsolved problem in biophysical chemistry is the development of a computationally simple, physically intuitive, and generally applicable method for accurately predicting and physically explaining protein-protein binding affinities from protein-protein interaction (PPI) complex coordinates. Here, we propose that the simplification of a previously described six-term PPI scoring function to a four term function results in a simple expression of all physically and statistically meaningful terms that can be used to accurately predict and explain binding affinities for a well-defined subset of PPIs that are characterized by (1) crystallographic coordinates, (2) rigid-body association, (3) normal interface size, and hydrophobicity and hydrophilicity, and (4) high quality experimental binding affinity measurements. We further propose that the four-term scoring function could be regarded as a core expression for future development into a more general PPI scoring function. Our work has clear implications for PPI modeling and structure-based drug design.
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Affiliation(s)
- Jon Swanson
- a ChemModeling LLC , Suite 101, 500 Huber Park Ct, Weldon Spring , MO 63304 , USA
| | - Joseph Audie
- b CMD Bioscience , 5 Science Park , New Haven , CT 06511 , USA.,c Department of Chemistry , Sacred Heart University , 5151 Park Ave, Fairfield , CT 06825 , USA
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36
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Morita R, Nakagawa M, Takehisa H, Hayashi Y, Ichida H, Usuda S, Ichinose K, Abe H, Shirakawa Y, Sato T, Fujiwara MT, Itoh RD, Abe T. Heavy-ion beam mutagenesis identified an essential gene for chloroplast development under cold stress conditions during both early growth and tillering stages in rice. Biosci Biotechnol Biochem 2016; 81:271-282. [PMID: 27804786 DOI: 10.1080/09168451.2016.1249452] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
We isolated a cold sensitive virescent1 (csv1) mutant from a rice (Oryza sativa L.) population mutagenized by carbon ion irradiation. The mutant exhibited chlorotic leaves during the early growth stages, and produced normal green leaves as it grew. The growth of csv1 plants displayed sensitivity to low temperatures. In addition, the mutant plants that were transferred to low temperatures at the fifth leaf stage produced chlorotic leaves subsequently. Genetic and molecular analyses revealed translocation of a 13-kb genomic fragment that disrupted the causative gene (CSV1; LOC_Os05g34040). CSV1 encodes a plastid-targeted oxidoreductase-like protein conserved among land plants, green algae, and cyanobacteria. Furthermore, CSV1 transcripts were more abundant in immature than in mature leaves, and they did not markedly increase or decrease with temperature. Taken together, our results indicate that CSV1 supports chloroplast development under cold stress conditions, in both the early growth and tillering stages in rice.
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Affiliation(s)
- Ryouhei Morita
- a Nishina Center for Accelerator-Based Science, RIKEN, Wako , Japan
| | - Mayu Nakagawa
- a Nishina Center for Accelerator-Based Science, RIKEN, Wako , Japan
| | - Hinako Takehisa
- a Nishina Center for Accelerator-Based Science, RIKEN, Wako , Japan
| | - Yoriko Hayashi
- a Nishina Center for Accelerator-Based Science, RIKEN, Wako , Japan
| | - Hiroyuki Ichida
- a Nishina Center for Accelerator-Based Science, RIKEN, Wako , Japan
| | - Sachiko Usuda
- a Nishina Center for Accelerator-Based Science, RIKEN, Wako , Japan
| | | | - Hiroshi Abe
- a Nishina Center for Accelerator-Based Science, RIKEN, Wako , Japan
| | - Yuki Shirakawa
- a Nishina Center for Accelerator-Based Science, RIKEN, Wako , Japan
| | - Tadashi Sato
- a Nishina Center for Accelerator-Based Science, RIKEN, Wako , Japan.,b Graduate School of Agricultural Science, Tohoku University , Sendai , Japan
| | - Makoto T Fujiwara
- a Nishina Center for Accelerator-Based Science, RIKEN, Wako , Japan.,c Faculty of Science and Technology , Sophia University , Tokyo , Japan
| | - Ryuuichi D Itoh
- d Faculty of Science , University of the Ryukyus , Nishihara, Japan
| | - Tomoko Abe
- a Nishina Center for Accelerator-Based Science, RIKEN, Wako , Japan
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Kravchuk VO, Savytskyi OV, Odynets KO, Mykuliak VV, Kornelyuk AI. Computational modeling and molecular dynamics simulations of mammalian cytoplasmic tyrosyl-tRNA synthetase and its complexes with substrates. J Biomol Struct Dyn 2016; 35:2772-2788. [PMID: 27615678 DOI: 10.1080/07391102.2016.1235512] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Cytoplasmic tyrosyl-tRNA synthetase (TyrRS) is one of the key enzymes of protein biosynthesis. TyrRSs of pathogenic organisms have gained attention as potential targets for drug development. Identifying structural differences between various TyrRSs will facilitate the development of specific inhibitors for the TyrRSs of pathogenic organisms. However, there is a deficiency in structural data for mammalian cytoplasmic TyrRS in complexes with substrates. In this work, we constructed spatial structure of full-length Bos taurus TyrRS (BtTyrRS) and its complexes with substrates using the set of computational modeling techniques. Special attention was paid to BtTyrRS complexes with substrates [L-tyrosine, K+ and ATP:Mg2+] and intermediate products [tyrosyl-adenylate (Tyr-AMP), K+ and PPi:Mg2+] with the different catalytic loop conformations. In order to analyze their dynamical properties, we performed 100 ns of molecular dynamics (MD) simulations. MD simulations revealed new structural data concerning the tyrosine activation reaction in mammalian TyrRS. Formation of strong interaction between Lys154 and γ-phosphate suggests the additional role of CP1 insertion as an important factor for ATP binding. The presence of a potassium-binding pocket within the active site of mammalian TyrRS compensates the absence of the second lysine in the KMSKS motif. Our data provide new details concerning a role of K+ ions at different stages of the first step of the tyrosylation reaction, including the coordination of substrates and involvement in the PPi releasing. The results of this work suggest that differences between ATP-binding sites of mammalian and bacterial TyrRSs are meaningful and could be exploited in the drug design.
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Affiliation(s)
- Vladyslav O Kravchuk
- a Department of Protein Engineering and Bioinformatics , Institute of Molecular Biology and Genetics, National Academy of Sciences of Ukraine , 150, Akademika Zabolotnogo Str., Kyiv , 03143 , Ukraine.,b Department of Biotechnology , National Aviation University , 1, Kosmonavta Komarova Str., Kyiv , 03058 , Ukraine
| | - Oleksandr V Savytskyi
- a Department of Protein Engineering and Bioinformatics , Institute of Molecular Biology and Genetics, National Academy of Sciences of Ukraine , 150, Akademika Zabolotnogo Str., Kyiv , 03143 , Ukraine
| | - Konstantin O Odynets
- a Department of Protein Engineering and Bioinformatics , Institute of Molecular Biology and Genetics, National Academy of Sciences of Ukraine , 150, Akademika Zabolotnogo Str., Kyiv , 03143 , Ukraine
| | - Vasyl V Mykuliak
- a Department of Protein Engineering and Bioinformatics , Institute of Molecular Biology and Genetics, National Academy of Sciences of Ukraine , 150, Akademika Zabolotnogo Str., Kyiv , 03143 , Ukraine.,c Institute of High Technologies , Taras Shevchenko National University of Kyiv , 64, Volodymyrs'ka Str., Kyiv , 01601 , Ukraine
| | - Alexander I Kornelyuk
- a Department of Protein Engineering and Bioinformatics , Institute of Molecular Biology and Genetics, National Academy of Sciences of Ukraine , 150, Akademika Zabolotnogo Str., Kyiv , 03143 , Ukraine.,c Institute of High Technologies , Taras Shevchenko National University of Kyiv , 64, Volodymyrs'ka Str., Kyiv , 01601 , Ukraine
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Lima AN, Philot EA, Trossini GHG, Scott LPB, Maltarollo VG, Honorio KM. Use of machine learning approaches for novel drug discovery. Expert Opin Drug Discov 2016; 11:225-39. [PMID: 26814169 DOI: 10.1517/17460441.2016.1146250] [Citation(s) in RCA: 138] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
INTRODUCTION The use of computational tools in the early stages of drug development has increased in recent decades. Machine learning (ML) approaches have been of special interest, since they can be applied in several steps of the drug discovery methodology, such as prediction of target structure, prediction of biological activity of new ligands through model construction, discovery or optimization of hits, and construction of models that predict the pharmacokinetic and toxicological (ADMET) profile of compounds. AREAS COVERED This article presents an overview on some applications of ML techniques in drug design. These techniques can be employed in ligand-based drug design (LBDD) and structure-based drug design (SBDD) studies, such as similarity searches, construction of classification and/or prediction models of biological activity, prediction of secondary structures and binding sites docking and virtual screening. EXPERT OPINION Successful cases have been reported in the literature, demonstrating the efficiency of ML techniques combined with traditional approaches to study medicinal chemistry problems. Some ML techniques used in drug design are: support vector machine, random forest, decision trees and artificial neural networks. Currently, an important application of ML techniques is related to the calculation of scoring functions used in docking and virtual screening assays from a consensus, combining traditional and ML techniques in order to improve the prediction of binding sites and docking solutions.
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Affiliation(s)
- Angélica Nakagawa Lima
- a Centro de Ciências Naturais e Humanas , Universidade Federal do ABC , São Paulo , Brazil
| | - Eric Allison Philot
- a Centro de Ciências Naturais e Humanas , Universidade Federal do ABC , São Paulo , Brazil
| | | | - Luis Paulo Barbour Scott
- c Centro de Matemática, Computação e Cognição , Universidade Federal do ABC , São Paulo , Brazil
| | | | - Kathia Maria Honorio
- a Centro de Ciências Naturais e Humanas , Universidade Federal do ABC , São Paulo , Brazil.,d Escola de Artes, Ciências e Humanidades , Universidade de São Paulo , São Paulo , Brazil
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Angeletti S, Lo Presti A, Giovanetti M, Grifoni A, Amicosante M, Ciotti M, Alcantara LCJ, Cella E, Ciccozzi M. Phylogenesys and homology modeling in Zika virus epidemic: food for thought. Pathog Glob Health 2016; 110:269-274. [PMID: 27670692 DOI: 10.1080/20477724.2016.1235337] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Abstract
Zika virus (ZIKV) is an emerging Flavivirus that have recently caused an outbreak in Brazil and rapid spread in several countries. In this study, the consequences of ZIKV evolution on protein recognition by the host immune system have been analyzed. Evolutionary analysis was combined with homology modeling and T-B cells epitope predictions. Two separate clades, the African one with the Uganda sequence, as the most probable ancestor, and the second one containing all the most recent sequences from the equatorial belt were identified. Brazilian strains clustered all together and closely related to the French Polynesia isolates. A strong presence of a negatively selected site in the envelope gene (Env) protein was evidenced, suggesting a probable purging of deleterious polymorphisms in functionally important genes. Our results show relative conservancy of ZIKV sequences when envelope and other non-structural proteins (NS3 and NS5) are analyzed by homology modeling. However, some regions within the consensus sequence of NS5 protein and to a lesser extent in the envelope protein, show localized high mutation frequency corresponding to a considerable alteration in protein stability. In terms of viral immune escape, envelope protein is under a higher selective pressure than NS5 and NS3 proteins for HLA class I and II molecules. Moreover, envelope mutations that are not strictly related to T-cell immune responses are mostly located on the surface of the protein in putative B-cell epitopes, suggesting an important contribution of B cells in the immune response as well.
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Affiliation(s)
- Silvia Angeletti
- a Unit of Clinical Pathology and Microbiology , University Campus Bio-Medico , Rome , Italy
| | - Alessandra Lo Presti
- b Department of Infectious, Parasitic, and Immune-Mediated Diseases, Epidemiology Unit, Reference Centre on Phylogeny, Molecular Epidemiology, and Microbial Evolution (FEMEM) , National Institute of Health , Rome , Italy
| | - Marta Giovanetti
- c Oswaldo Cruz Foundation (FIOCRUZ) , Salvador , Brazil.,d Department of Biology , University of Rome 'Tor Vergata' , Rome , Italy
| | | | - Massimo Amicosante
- e ProxAgen Ltd , Sofia , Bulgaria.,f Department of Biomedicine and Prevention , University of Rome "Tor Vergata" , Rome , Italy
| | - Marco Ciotti
- g Laboratory of Molecular Virology , Polyclinic Tor Vergata Foundation , Rome , Italy
| | | | - Eleonora Cella
- b Department of Infectious, Parasitic, and Immune-Mediated Diseases, Epidemiology Unit, Reference Centre on Phylogeny, Molecular Epidemiology, and Microbial Evolution (FEMEM) , National Institute of Health , Rome , Italy.,h Department of Public Health and Infectious Diseases , Sapienza University of Rome , Rome , Italy
| | - Massimo Ciccozzi
- a Unit of Clinical Pathology and Microbiology , University Campus Bio-Medico , Rome , Italy.,b Department of Infectious, Parasitic, and Immune-Mediated Diseases, Epidemiology Unit, Reference Centre on Phylogeny, Molecular Epidemiology, and Microbial Evolution (FEMEM) , National Institute of Health , Rome , Italy
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40
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Khan FI, Bisetty K, Gu KR, Singh S, Permaul K, Hassan MI, Wei DQ. Molecular dynamics simulation of chitinase I from Thermomyces lanuginosus SSBP to ensure optimal activity. MOLECULAR SIMULATION 2016. [DOI: 10.1080/08927022.2016.1237024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Faez Iqbal Khan
- School of Chemistry and Chemical Engineering, Henan University of Technology, Henan, China
| | - Krishna Bisetty
- Department of Chemistry, Durban University of Technology, Durban, South Africa
| | - Ke-Ren Gu
- School of Chemistry and Chemical Engineering, Henan University of Technology, Henan, China
| | - Suren Singh
- Department of Biotechnology and Food Technology, Durban University of Technology, Durban, South Africa
| | - Kugen Permaul
- Department of Biotechnology and Food Technology, Durban University of Technology, Durban, South Africa
| | - Md. Imtaiyaz Hassan
- Centre for Interdisciplinary Research in Basic Science, Jamia Millia Islamia, New Delhi, India
| | - Dong-Qing Wei
- School of Chemistry and Chemical Engineering, Henan University of Technology, Henan, China
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41
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Du X, Sang P, Xia YL, Li Y, Liang J, Ai SM, Ji XL, Fu YX, Liu SQ. Comparative thermal unfolding study of psychrophilic and mesophilic subtilisin-like serine proteases by molecular dynamics simulations. J Biomol Struct Dyn 2016; 35:1500-1517. [PMID: 27485684 DOI: 10.1080/07391102.2016.1188155] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Molecular dynamics (MD) simulations of a subtilisin-like serine protease VPR from the psychrophilic marine bacterium Vibrio sp. PA-44 and its mesophilic homologue, proteinase K (PRK), have been performed for 20 ns at four different temperatures (300, 373, 473, and 573 K). The comparative analyses of MD trajectories reveal that at almost all temperatures, VPR exhibits greater structural fluctuations/deviations, more unstable regular secondary structural elements, and higher global flexibility than PRK. Although these two proteases follow similar unfolding pathways at high temperatures, VPR initiates unfolding at a lower temperature and unfolds faster at the same high temperatures than PRK. These observations collectively indicate that VPR is less stable and more heat-labile than PRK. Analyses of the structural/geometrical properties reveal that, when compared to PRK, VPR has larger radius of gyration (Rg), less intramolecular contacts and hydrogen bonds (HBs), more protein-solvent HBs, and smaller burial of nonpolar area and larger exposure of polar area. These suggest that the increased flexibility of VPR would be most likely caused by its reduced intramolecular interactions and more favourable protein-solvent interactions arising from the larger exposure of the polar area, whereas the enhanced stability of PRK could be ascribed to its increased intramolecular interactions arising from the better optimized hydrophobicity. The factors responsible for the significant differences in local flexibility between these two proteases were also analyzed and ascertained. This study provides insights into molecular basis of thermostability of homologous serine proteases adapted to different temperatures.
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Affiliation(s)
- Xing Du
- a Laboratory for Conservation and Utilization of Bio-Resources , Yunnan University , Kunming 650091 , PR China
| | - Peng Sang
- b Laboratory of Molecular Cardiology, Department of Cardiology , The First Affiliated Hospital of Kunming Medical University , Kunming 650032 , PR China
| | - Yuan-Ling Xia
- a Laboratory for Conservation and Utilization of Bio-Resources , Yunnan University , Kunming 650091 , PR China
| | - Yi Li
- a Laboratory for Conservation and Utilization of Bio-Resources , Yunnan University , Kunming 650091 , PR China
| | - Jing Liang
- a Laboratory for Conservation and Utilization of Bio-Resources , Yunnan University , Kunming 650091 , PR China
| | - Shi-Meng Ai
- c Department of Applied Mathematics , Yunnan Agricultural University , Kunming 650201 , PR China
| | - Xing-Lai Ji
- a Laboratory for Conservation and Utilization of Bio-Resources , Yunnan University , Kunming 650091 , PR China.,d Key Laboratory for Tumor Molecular Biology of High Education in Yunnan Province, School of Life Sciences , Yunnan University , Kunming 650223 , PR China
| | - Yun-Xin Fu
- a Laboratory for Conservation and Utilization of Bio-Resources , Yunnan University , Kunming 650091 , PR China.,e Human Genetics Center and Division of Biostatistics, School of Public Health , The University of Texas Health Science Center , Houston , TX , 77030 , USA
| | - Shu-Qun Liu
- a Laboratory for Conservation and Utilization of Bio-Resources , Yunnan University , Kunming 650091 , PR China.,d Key Laboratory for Tumor Molecular Biology of High Education in Yunnan Province, School of Life Sciences , Yunnan University , Kunming 650223 , PR China
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42
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Fratev F. PPARγ non-covalent antagonists exhibit mutable binding modes with a similar free energy of binding: a case study. J Biomol Struct Dyn 2016; 35:476-485. [DOI: 10.1080/07391102.2016.1151830] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Filip Fratev
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Block 105, 1113 Sofia, Bulgaria
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43
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Wu S. Loop-driven conformational transition between the alternative and collapsed form of prethrombin-2: targeted molecular dynamics study. J Biomol Struct Dyn 2016; 35:119-127. [PMID: 27471844 DOI: 10.1080/07391102.2015.1134347] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Two distinct crystal structures of prethrombin-2, the alternative and collapsed forms, are elucidated by X-ray crystallogrphy. We analyzed the conformational transition from the alternative to the collapsed form employing targeted molecular dynamics (TMD) simulation. Despite small RMSD difference in the two X-ray crystal structures, some hydrophobic residues (W60d, W148, W215, and F227) show a significant difference between the two conformations. TMD simulation shows that the four hydrophobic residues undergo concerted movement from dimer to trimer transition via tetramer state in the conformational change from the alternative to the collapsed form. We reveal that the concerted movement of the four hydrophobic residues is controlled by movement of specific loop regions behind. In this paper, we propose a sequential scenario for the conformational transition from the alternative form to the collapsed form, which is partially supported by the mutant W148A simulation.
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Affiliation(s)
- Sangwook Wu
- a Department of Physics , Pukyong National University , Busan 608-737 , Republic of Korea
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44
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Arif Z, Arfat MY, Neelofar K, Ahmad S, Badar A, Khan MA, Zaman A, Ahmad J. Effect of peroxynitrite on human serum albumin: a multi technique approach. J Biomol Struct Dyn 2016; 35:2066-2076. [PMID: 27346535 DOI: 10.1080/07391102.2016.1206489] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
In this study, human serum albumin (HSA), the most abundant protein of blood plasma, was modified with varying concentrations of peroxynitrite. The peroxynitrite-induced changes in HSA was monitored by spectroscopy, SDS-PAGE, 1-anilinonaphthalene-8-sulfonic acid (ANS), thermal denaturation studies, and matrix-assisted laser desorption/inonization-time of flight mass spectrometry (MALDI-TOF MS). Aggregate formation was studied by thioflavin T binding and scanning electron microscopy (SEM). The results indicated formation of 3-nitrotyrosine, 6-nitrotryptophan, dityrosine, and carbonyls in modified samples and showed retarded mobility in SDS-polyacrylamide gel. Reduction in α-helicity and surface protein hydrophobicity confirmed the secondary and tertiary structure alterations in peroxynitrite-modified-HSA. Also, attachment of nitro group and increase in melting temperature was observed in modified sample. Furthermore, significant enhancement in the fluorescence intensity of ThT upon binding with peroxynitrite-modified-HSA and images under scanning electron microscope are suggestive of protein aggregation. It is, therefore, speculated that HSA modified by endogenously formed peroxynitrite might act as a trigger for nitration/aggregation and suggested the role of peroxynitrite-modified-HSA in SLE.
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Affiliation(s)
- Zarina Arif
- a Facuty of Medicine, Department of Biochemistry , J.N. Medical College, Aligarh Muslim University , Aligarh 202002 , UP , India
| | - Mir Yasir Arfat
- a Facuty of Medicine, Department of Biochemistry , J.N. Medical College, Aligarh Muslim University , Aligarh 202002 , UP , India
| | - Km Neelofar
- b Faculty of Medicine, Rajiv Gandhi Centre for Diabetes and Endocrinology , J.N. Medical College, Aligarh Muslim University , Aligarh 202002 , UP , India
| | - Shafeeque Ahmad
- a Facuty of Medicine, Department of Biochemistry , J.N. Medical College, Aligarh Muslim University , Aligarh 202002 , UP , India
| | - Asim Badar
- a Facuty of Medicine, Department of Biochemistry , J.N. Medical College, Aligarh Muslim University , Aligarh 202002 , UP , India
| | - Md Adnan Khan
- a Facuty of Medicine, Department of Biochemistry , J.N. Medical College, Aligarh Muslim University , Aligarh 202002 , UP , India
| | - Asif Zaman
- a Facuty of Medicine, Department of Biochemistry , J.N. Medical College, Aligarh Muslim University , Aligarh 202002 , UP , India
| | - Jamal Ahmad
- b Faculty of Medicine, Rajiv Gandhi Centre for Diabetes and Endocrinology , J.N. Medical College, Aligarh Muslim University , Aligarh 202002 , UP , India
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45
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Zhang YW, Guo YS, Bao XQ, Sun H, Zhang D. Bicyclol promotes toll-like 2 receptor recruiting inosine 5'-monophosphate dehydrogenase II to exert its anti-inflammatory effect. JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH 2016; 18:475-485. [PMID: 26744808 DOI: 10.1080/10286020.2015.1131678] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Accepted: 12/10/2015] [Indexed: 06/05/2023]
Abstract
The aim was to investigate potential targets and anti-inflammatory mechanisms of bicyclol, which has been extensively used in clinic for decades in China. Tar-Fis-Dock, virtual molecular docking system, showed that inosine 5'-monophosphate dehydrogenase II (IMPDH II) has the highest probability of binding to bicyclol. To investigate the possible role of IMPDH II in mechanisms of bicyclol, recombinant enzyme models, mice splenic lymphocytes, and human lymphocytes were used. Bicyclol (1-5 μM) significantly inhibited the proliferation of mice splenic lymphocytes stimulated by concanavalin A (conA). However, bicyclol did not show inhibitory effects on proliferation of human peripheral blood mononuclear cells (hPBMC) induced by phytohemagglutinin (PHA). IMPDH II enzyme kinetic model showed that bicyclol only had a slight regulatory effect on IMPDH II enzyme activity. These results revealed that bicyclol may be not a conventional inhibitor of IMPDH II. Further studies showed that bicyclol could promote recruitment of IMPDH II by active toll-like 2 receptor (TLR2) complex. Such effects lead to the reduction of nuclear factor κB (NF-κB) expression, increase in I-κB expression, and decrease in cytokine release, including tumor necrosis factor α (TNF-α) and interleukin 1β (IL-1β). It may be a new mechanism of bicyclol for its anti-inflammatory effect.
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Affiliation(s)
- You-Wen Zhang
- a State Key Laboratory of Bioactive Substance and Function of Natural Medicines , Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College , Beijing 100050 , China
| | - Yan-Shen Guo
- a State Key Laboratory of Bioactive Substance and Function of Natural Medicines , Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College , Beijing 100050 , China
| | - Xiu-Qi Bao
- a State Key Laboratory of Bioactive Substance and Function of Natural Medicines , Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College , Beijing 100050 , China
| | - Hua Sun
- a State Key Laboratory of Bioactive Substance and Function of Natural Medicines , Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College , Beijing 100050 , China
| | - Dan Zhang
- a State Key Laboratory of Bioactive Substance and Function of Natural Medicines , Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College , Beijing 100050 , China
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46
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Chang CK, Wang SSS, Lo CH, Hsiao HC, Wu JW. Investigation of the early stages of human γD-crystallin aggregation process. J Biomol Struct Dyn 2016; 35:1042-1054. [PMID: 27025196 DOI: 10.1080/07391102.2016.1170632] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Cataract, a major cause of visual impairment worldwide, is a common disease of the eye lens related to protein aggregation. Several factors including the exposure of ultraviolet irradiation and possibly acidic condition may induce the unfolding and subsequent aggregation of the crystallin proteins leading to crystalline lens opacification. Human γD-crystallin (HγDC), a 173 residue monomeric protein, abundant in the nucleus of the human eye lens, has been shown to aggregate and form amyloid fibrils under acidic conditions and that this aggregation route is thought to be a potential initiation pathway for the onset of age-related nuclear cataract. However, the underlying mechanism of fibril formation remains elusive. This report is aimed at examining the structural changes and possible amyloid fibril formation pathway of HγDC using molecular dynamics and molecular docking simulations. Our findings demonstrated that incubation of HγDC under the acidic condition redistributes the protein surface charges and affects the protein interaction with its surrounding solvent environment. This brings about a twist motion in the overall tertiary structure that gives rise to newly formed anti-parallel β-strands in the C-terminal flexible loop regions. The change in protein structural conformation also involves an alteration in specific salt-bridge interactions. Altogether, these findings revealed a plausible mechanism for amyloid fibril formation of HγDC that is important to the early stages of HγDC aggregation involved in cataractogenesis.
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Affiliation(s)
- Chih-Kai Chang
- a Department of Chemical Engineering , National Taiwan University , Taipei 10617 , Taiwan
| | - Steven S-S Wang
- a Department of Chemical Engineering , National Taiwan University , Taipei 10617 , Taiwan
| | - Chun-Hsien Lo
- a Department of Chemical Engineering , National Taiwan University , Taipei 10617 , Taiwan
| | - Hsiang-Chun Hsiao
- a Department of Chemical Engineering , National Taiwan University , Taipei 10617 , Taiwan
| | - Josephine W Wu
- b Department of Optometry, Central Taiwan University of Science and Technology , Taichung 40601 , Taiwan
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47
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Fakhar Z, Naiker S, Alves CN, Govender T, Maguire GEM, Lameira J, Lamichhane G, Kruger HG, Honarparvar B. A comparative modeling and molecular docking study on Mycobacterium tuberculosis targets involved in peptidoglycan biosynthesis. J Biomol Struct Dyn 2016; 34:2399-417. [PMID: 26612108 DOI: 10.1080/07391102.2015.1117397] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
An alarming rise of multidrug-resistant Mycobacterium tuberculosis strains and the continuous high global morbidity of tuberculosis have reinvigorated the need to identify novel targets to combat the disease. The enzymes that catalyze the biosynthesis of peptidoglycan in M. tuberculosis are essential and noteworthy therapeutic targets. In this study, the biochemical function and homology modeling of MurI, MurG, MraY, DapE, DapA, Alr, and Ddl enzymes of the CDC1551 M. tuberculosis strain involved in the biosynthesis of peptidoglycan cell wall are reported. Generation of the 3D structures was achieved with Modeller 9.13. To assess the structural quality of the obtained homology modeled targets, the models were validated using PROCHECK, PDBsum, QMEAN, and ERRAT scores. Molecular dynamics simulations were performed to calculate root mean square deviation (RMSD) and radius of gyration (Rg) of MurI and MurG target proteins and their corresponding templates. For further model validation, RMSD and Rg for selected targets/templates were investigated to compare the close proximity of their dynamic behavior in terms of protein stability and average distances. To identify the potential binding mode required for molecular docking, binding site information of all modeled targets was obtained using two prediction algorithms. A docking study was performed for MurI to determine the potential mode of interaction between the inhibitor and the active site residues. This study presents the first accounts of the 3D structural information for the selected M. tuberculosis targets involved in peptidoglycan biosynthesis.
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Affiliation(s)
- Zeynab Fakhar
- a Catalysis and Peptide Research Unit, School of Health Sciences , University of KwaZulu-Natal , Durban 4001 , South Africa
| | - Suhashni Naiker
- a Catalysis and Peptide Research Unit, School of Health Sciences , University of KwaZulu-Natal , Durban 4001 , South Africa
| | - Claudio N Alves
- b Laboratório de Planejamento de Fármacos, Instituto de Ciências Exatas e Naturais , Instituto de Ciências Biológicas, Universidade Federal do Pará , CEP 66075-110, Belém , Pará , Brazil
| | - Thavendran Govender
- a Catalysis and Peptide Research Unit, School of Health Sciences , University of KwaZulu-Natal , Durban 4001 , South Africa
| | - Glenn E M Maguire
- a Catalysis and Peptide Research Unit, School of Health Sciences , University of KwaZulu-Natal , Durban 4001 , South Africa.,c School of Chemistry and Physics , University of KwaZulu-Natal , 4001 Durban , South Africa
| | - Jeronimo Lameira
- b Laboratório de Planejamento de Fármacos, Instituto de Ciências Exatas e Naturais , Instituto de Ciências Biológicas, Universidade Federal do Pará , CEP 66075-110, Belém , Pará , Brazil
| | - Gyanu Lamichhane
- d Division of Infectious Diseases, Center for Tuberculosis Research , Johns Hopkins University School of Medicine , Baltimore , MD 21205 , USA
| | - Hendrik G Kruger
- a Catalysis and Peptide Research Unit, School of Health Sciences , University of KwaZulu-Natal , Durban 4001 , South Africa
| | - Bahareh Honarparvar
- a Catalysis and Peptide Research Unit, School of Health Sciences , University of KwaZulu-Natal , Durban 4001 , South Africa
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48
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Khan MB, Khan H, Shah MU, Khan S. Purification and biochemical properties of SDS-stable low molecular weight alkaline serine protease from Citrullus colocynthis. Nat Prod Res 2016; 30:935-40. [PMID: 26942486 DOI: 10.1080/14786419.2015.1079909] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
A low molecular weight serine protease from seeds of Citrullus colocynthis was purified to electrophoretic homogeneity with high level of catalytic efficiency (22,945 M(-1) S(-1)). The enzyme was a monomer with molecular mass of 25 kDa estimated by SDS-PAGE. The enzyme was highly active over a pH range of 6.5-9.0 and temperature range of 20-80 °C, with maximum activity at pH 7.5 and at 50 °C. The K(m) and K(cat) were 73 μg/mL and 67/s, respectively. The enzyme was strongly inhibited by PMSF, moderately by soybean trypsin inhibitor, indicating that the enzyme was a serine protease. The enzyme retained 86 and 73% of its activity in the presence of urea and DTT, respectively, and its activity was slightly enhanced in the presence of anionic detergent (SDS). Thus, the enzyme is a novel SDS-stable protease with high catalytic efficiency over wide ranges of pH and temperature which is commercially promising for various industrial applications.
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Affiliation(s)
- Muhammad Bashir Khan
- a Department of Bioscience , COMSATS Institute of Information Technology Islamabad , Pakistan.,b H.E.J Research Institute of Chemistry , International Centre for Chemical Sciences, University of Karachi , Karachi , Pakistan
| | - Hidayatullah Khan
- c Department of Chemistry , University of Science and Technology , Bannu , Pakistan
| | - Muhammad Usman Shah
- a Department of Bioscience , COMSATS Institute of Information Technology Islamabad , Pakistan
| | - Sanaullah Khan
- a Department of Bioscience , COMSATS Institute of Information Technology Islamabad , Pakistan
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49
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Rahul CN, Shiva Krishna K, Pawar AP, Rajesh V. In silico approach to ascertain the calcium dependent role of Plasmodium falciparum SERA5. J Biomol Struct Dyn 2016; 35:17-25. [PMID: 26725489 DOI: 10.1080/07391102.2015.1129988] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
The P. falciparum serine repeat antigen (PfSERA5) is the most abundantly expressed protein in the parasitophorous vacuole during the asexual blood stage and serves as both drug and vaccine target. The processed central fragment (56 KDa) of PfSERA5 is implicated to play an important role in parasite exit (egress) during schizont rupture from erythrocytes. Structural characterization of its enzymatic domain supports protease-like function for this central domain. The understanding of exact functional role of PfSERA5 in parasite egress remains unconfirmed as recent studies also indicate an indispensable non-catalytic role for PfSERA5 putative enzyme domain in the blood stage. No structural insight into PfSERA5 prodomain is available. Structure prediction of PfSERA5 prodomain using in silico approach in our study, showed it to have structural similarity with calcium-binding proteins. An earlier observation of steep rise in intracellular calcium concentration as an important factor in egress makes the prodomain calcium-binding role significant. The implication of calcium on structure and activity of PfSERA5 putative enzyme domain is also unknown, and such information would aid to substantiating any calcium-dependent effects on PfSERA5. To understand this, we performed molecular dynamic (MD) simulation both in the presence and absence of calcium. MD results show secondary structure conformational differences in local regions of protein structure. Our results support calcium to be an important parameter for stability and function of PfSERA5. This computational assessment suggest a need to design future experiments like calcium-dependent inhibition studies to reveal exact functional role of PfSERA5 in parasite egress.
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Affiliation(s)
- C N Rahul
- a Department of Biological Sciences, Birla Institute of Technology and Science, Pilani , Hyderabad Campus , Andhra Pradesh , India
| | - K Shiva Krishna
- a Department of Biological Sciences, Birla Institute of Technology and Science, Pilani , Hyderabad Campus , Andhra Pradesh , India
| | - Atul P Pawar
- a Department of Biological Sciences, Birla Institute of Technology and Science, Pilani , Hyderabad Campus , Andhra Pradesh , India
| | - Vidya Rajesh
- a Department of Biological Sciences, Birla Institute of Technology and Science, Pilani , Hyderabad Campus , Andhra Pradesh , India
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50
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Omotuyi OI, Hamada T. Human furin Cys198 imposes dihedral and positional restraints on His194 for optimal Ser386-proton transfer. J Biomol Struct Dyn 2015; 33:2442-51. [DOI: 10.1080/07391102.2015.1041552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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