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Anand PK, Kumar A, Saini A, Kaur J. Mutation in Eth A protein of Mycobacterium tuberculosis conferred drug tolerance against enthinoamide in Mycobacterium smegmatis mc2155. Comput Biol Chem 2022; 98:107677. [DOI: 10.1016/j.compbiolchem.2022.107677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Revised: 03/15/2022] [Accepted: 03/30/2022] [Indexed: 11/03/2022]
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Kumar GS, Sobhia ME, Ghosh K. Binding affinity analysis of quinolone and dione inhibitors with Mtb-DNA gyrase emphasising the crystal water molecular transfer energy to the protein–ligand association. MOLECULAR SIMULATION 2022. [DOI: 10.1080/08927022.2022.2042530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- G. Siva Kumar
- Department of Pharmacoinformatics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Punjab, India
| | - M. Elizabeth Sobhia
- Department of Pharmacoinformatics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Punjab, India
| | - Ketan Ghosh
- Department of Pharmacoinformatics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Punjab, India
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Gong Z, Wang G, Zeng J, Stojkoska A, Huang H, Xie J. Differential DNA methylomes of clinical MDR, XDR and XXDR Mycobacterium tuberculosis isolates revealed by using single-molecule real-time sequencing. J Drug Target 2020; 29:69-77. [PMID: 32672115 DOI: 10.1080/1061186x.2020.1797049] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Post-replicative DNA methylation is essential for diverse biological processes in both eukaryotes and prokaryotes. Mycobacterium tuberculosis (M. tuberculosis), the causative agent of tuberculosis, remains one of the most formidable threats worldwide. Although DNA methylation of M. tuberculosis has been documented, little information is available for clinical drug-resistant M. tuberculosis. Single-molecule real-time (SMRT) sequencing was used to profile the core methylome of three clinical isolates, namely multidrug-resistant (MDR), extensively drug-resistant (XDR) and extremely drug-resistant (XXDR) strains. 3812, 6808 and 6041 DNA methylated sites were identified in MDR-MTB, XDR-MTB and XXDR-MTB genome, respectively. There are two types of methylated motifs, namely N6-methyladenine (m6A) and N4-methylcytosine (m4C). A novel widespread 6 mA methylation motif 5'-CACGCAG-3' was found in XDR-MTB and XXDR-MTB. The methylated genes are involved in multiple cellular processes, especially metabolic enzymes engaged in glucose metabolism, fatty acid and TCA cycle. Many methylated genes are involved in mycobacterial virulence, antibiotic resistance and tolerance. This provided a comprehensive list of methylated genes in drug-resistant clinical isolates and the basis for further functional elucidation.
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Affiliation(s)
- Zhen Gong
- State Key Laboratory Breeding Base of Eco-Environment and Bio-Resource of the Three Gorges Area, Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences, Institute of Modern Biopharmaceuticals, Southwest University, Chongqing, China
| | - Guirong Wang
- National Clinical Laboratory on Tuberculosis, Beijing Key Laboratory on Drug-resistant Tuberculosis Research, Beijing Chest Hospital, Capital Medical University, Beijing Tuberculosis and Thoracic Tumor Institute, Beijing, China
| | - Jie Zeng
- State Key Laboratory Breeding Base of Eco-Environment and Bio-Resource of the Three Gorges Area, Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences, Institute of Modern Biopharmaceuticals, Southwest University, Chongqing, China
| | - Andrea Stojkoska
- State Key Laboratory Breeding Base of Eco-Environment and Bio-Resource of the Three Gorges Area, Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences, Institute of Modern Biopharmaceuticals, Southwest University, Chongqing, China
| | - Hairong Huang
- National Clinical Laboratory on Tuberculosis, Beijing Key Laboratory on Drug-resistant Tuberculosis Research, Beijing Chest Hospital, Capital Medical University, Beijing Tuberculosis and Thoracic Tumor Institute, Beijing, China
| | - Jianping Xie
- State Key Laboratory Breeding Base of Eco-Environment and Bio-Resource of the Three Gorges Area, Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences, Institute of Modern Biopharmaceuticals, Southwest University, Chongqing, China
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Rabha A, Singh A, Grover S, Kumari A, Pandey B, Grover A. Structural basis for isoniazid resistance in KatG double mutants of Mycobacterium tuberculosis. Microb Pathog 2019; 129:152-160. [PMID: 30731190 DOI: 10.1016/j.micpath.2019.02.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2018] [Revised: 01/31/2019] [Accepted: 02/01/2019] [Indexed: 01/02/2023]
Abstract
The failure of drugs for effective treatment against infectious diseases can be attributed to resistant forms of causative agents. The evasive nature of Mycobacterium tuberculosis is partly associated to its physical features, such as having a thick cell wall and incorporation of beneficial mutations leading to drug resistance. The pro drug Isoniazid (INH) interacts with an enzyme catalase peroxidase to get converted into its active form and upon activation stops the cell wall synthesis thus killing the Mycobacterium. The most common mutation i.e. S315T leads to high degree of drug resistance by virtue of its position in the active site. Here, we have characterized the prominent attributes of two double mutant isolates S315 T/D194G and S315T/M624V which are multi drug resistant and extremely drug resistant, respectively. Protein models were generated using the crystal structure which were then subjected to energy minimization and long term molecular dynamics simulations. Further, computational analysis showed decreasing ability of INH binding to the mutants in order of: Native > S315T/D194G > S315T/M624V. Also, a trend was observed that as the docking score and binding area decreased, there was a significant increase in the distortion of the 3D geometry of the mutants as observed by PCA analysis.
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Affiliation(s)
- Aneesh Rabha
- School of Biotechnology, Jawaharlal Nehru University, New Delhi, 110067, India
| | - Aditi Singh
- School of Biotechnology, Jawaharlal Nehru University, New Delhi, 110067, India; Department of Biotechnology, TERI School of Advanced Studies, Vasant Kunj, New Delhi, 110070, India
| | - Sonam Grover
- Kusuma School of Biological Sciences, Indian Institute of Technology Delhi, 110016, India
| | - Anchala Kumari
- School of Biotechnology, Jawaharlal Nehru University, New Delhi, 110067, India; Department of Biotechnology, TERI School of Advanced Studies, Vasant Kunj, New Delhi, 110070, India
| | - Bharati Pandey
- Department of Biotechnology, Panjab University, Chandigarh, 160014, India
| | - Abhinav Grover
- School of Biotechnology, Jawaharlal Nehru University, New Delhi, 110067, India.
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Kumar N, Singh A, Grover S, Kumari A, Kumar Dhar P, Chandra R, Grover A. HHV-5 epitope: A potential vaccine candidate with high antigenicity and large coverage. J Biomol Struct Dyn 2018; 37:2098-2109. [PMID: 30044169 DOI: 10.1080/07391102.2018.1477620] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Outbreak of Human Herpes virus-5 (HHV-5) infection in emerging countries has raised worldwide health concern owing to prevalence of congenital impairments and life threatening consequences in immunocompromised individuals. Thus, there lies an impending need to develop vaccine against HHV-5. HHV-5 enters into host cells with the help of necessary components glycoprotein B (gB) and H/L. In this study, the conformational linear B-cell and T-cell epitopes for gB of HHV-5 have been predicted using conformational approaches, for their possible collective use as vaccine candidates. We examined epitope's interactions with major histocompatibility complexes using molecular docking and also investigated their stable binding with specific toll like receptor-2 (TLR2), present on host cells during HHV-5 infection. Predicted MHC-I epitope 'LVAIAVVII' with high antigenicity and large coverage of HLA alleles was found to superimpose on MHC-II epitope (Rank 1) and was also identified to be the core sequence of putative B cell epitope 'ILVAIAVVIITYLI'. Resulting epitope was found to have consistent interaction with TLR2 during long term (100 ns) MD run. We also validated this nonamer epitope for its dissimilarity with human genome and high population coverage, suggesting it to be a potential vaccine candidate with higher coverage for both the MHC alleles of Indian population. Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Neeraj Kumar
- a Drug Discovery and Development Laboratory, Department of Chemistry , University of Delhi , New Delhi , India
| | - Aditi Singh
- b Department of Biotechnology , TERI School of Advanced Studies , New Delhi , India.,c School of Biotechnology , Jawaharlal Nehru University , New Delhi , India
| | - Sonam Grover
- d Kusuma School of Biological Sciences , IIT Delhi , New Delhi , India
| | - Anchala Kumari
- b Department of Biotechnology , TERI School of Advanced Studies , New Delhi , India.,c School of Biotechnology , Jawaharlal Nehru University , New Delhi , India
| | - Pawan Kumar Dhar
- c School of Biotechnology , Jawaharlal Nehru University , New Delhi , India
| | - Ramesh Chandra
- a Drug Discovery and Development Laboratory, Department of Chemistry , University of Delhi , New Delhi , India
| | - Abhinav Grover
- c School of Biotechnology , Jawaharlal Nehru University , New Delhi , India
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Pandey B, Grover A, Sharma P. Molecular dynamics simulations revealed structural differences among WRKY domain-DNA interaction in barley (Hordeum vulgare). BMC Genomics 2018; 19:132. [PMID: 29433424 PMCID: PMC5810047 DOI: 10.1186/s12864-018-4506-3] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Accepted: 01/29/2018] [Indexed: 12/29/2022] Open
Abstract
Background The WRKY transcription factors are a class of DNA-binding proteins involved in diverse plant processes play critical roles in response to abiotic and biotic stresses. Genome-wide divergence analysis of WRKY gene family in Hordeum vulgare provided a framework for molecular evolution and functional roles. So far, the crystal structure of WRKY from barley has not been resolved; moreover, knowledge of the three-dimensional structure of WRKY domain is pre-requisites for exploring the protein-DNA recognition mechanisms. Homology modelling based approach was used to generate structures for WRKY DNA binding domain (DBD) and its variants using AtWRKY1 as a template. Finally, the stability and conformational changes of the generated model in unbound and bound form was examined through atomistic molecular dynamics (MD) simulations for 100 ns time period. Results In this study, we investigated the comparative binding pattern of WRKY domain and its variants with W-box cis-regulatory element using molecular docking and dynamics (MD) simulations assays. The atomic insight into WRKY domain exhibited significant variation in the intermolecular hydrogen bonding pattern, leading to the structural anomalies in the variant type and differences in the DNA-binding specificities. Based on the MD analysis, residual contribution and interaction contour, wild-type WRKY (HvWRKY46) were found to interact with DNA through highly conserved heptapeptide in the pre- and post-MD simulated complexes, whereas heptapeptide interaction with DNA was missing in variants (I and II) in post-MD complexes. Consequently, through principal component analysis, wild-type WRKY was also found to be more stable by obscuring a reduced conformational space than the variant I (HvWRKY34). Lastly, high binding free energy for wild-type and variant II allowed us to conclude that wild-type WRKY-DNA complex was more stable relative to variants I. Conclusions The results of our study revealed complete dynamic and structural information about WRKY domain-DNA interactions. However, no structure base information reported to date for WRKY variants and their mechanism of interaction with DNA. Our findings highlighted the importance of selecting a sequence to generate newer transgenic plants that would be increasingly tolerance to stress conditions. Electronic supplementary material The online version of this article (10.1186/s12864-018-4506-3) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Bharati Pandey
- Plant Biotechnology Unit, ICAR-Indian Institute of Wheat and Barley Research, Karnal, 132001, India.,Present address: Department of Biotechnology, Panjab University Chandigarh, Chandigarh, 160014, India
| | - Abhinav Grover
- School of Biotechnology, Jawaharlal Nehru University, New Delhi, 110067, India
| | - Pradeep Sharma
- Plant Biotechnology Unit, ICAR-Indian Institute of Wheat and Barley Research, Karnal, 132001, India.
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