Structural Implications of Mutations Conferring Rifampin Resistance in Mycobacterium leprae.
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Authors
Vedithi, Sundeep Chaitanya
Malhotra, Sony
Das, Madhusmita
Daniel, Sheela
Kishore, Nanda
George, Anuja
Arumugam, Shantha
Rajan, Lakshmi
Ebenezer, Mannam
Ascher, David B
Arnold, Eddy
Publication Date
2018-03-22Journal Title
Sci Rep
ISSN
2045-2322
Publisher
Springer Science and Business Media LLC
Volume
8
Issue
1
Pages
5016
Language
eng
Type
Article
Physical Medium
Electronic
Metadata
Show full item recordCitation
Vedithi, S. C., Malhotra, S., Das, M., Daniel, S., Kishore, N., George, A., Arumugam, S., et al. (2018). Structural Implications of Mutations Conferring Rifampin Resistance in Mycobacterium leprae.. Sci Rep, 8 (1), 5016. https://doi.org/10.1038/s41598-018-23423-1
Abstract
The rpoB gene encodes the β subunit of RNA polymerase holoenzyme in Mycobacterium leprae (M. leprae). Missense mutations in the rpoB gene were identified as etiological factors for rifampin resistance in leprosy. In the present study, we identified mutations corresponding to rifampin resistance in relapsed leprosy cases from three hospitals in southern India which treat leprosy patients. DNA was extracted from skin biopsies of 35 relapse/multidrug therapy non-respondent leprosy cases, and PCR was performed to amplify the 276 bp rifampin resistance-determining region of the rpoB gene. PCR products were sequenced, and mutations were identified in four out of the 35 cases at codon positions D441Y, D441V, S437L and H476R. The structural and functional effects of these mutations were assessed in the context of three-dimensional comparative models of wild-type and mutant M. leprae RNA polymerase holoenzyme (RNAP), based on the recently solved crystal structures of RNAP of Mycobacterium tuberculosis, containing a synthetic nucleic acid scaffold and rifampin. The resistance mutations were observed to alter the hydrogen-bonding and hydrophobic interactions of rifampin and the 5' ribonucleotide of the growing RNA transcript. This study demonstrates that rifampin-resistant strains of M. leprae among leprosy patients in southern India are likely to arise from mutations that affect the drug-binding site and stability of RNAP.
Keywords
Humans, Mycobacterium leprae, Leprosy, Recurrence, Rifampin, DNA-Directed RNA Polymerases, Bacterial Proteins, DNA, Bacterial, Leprostatic Agents, Treatment Outcome, Microbial Sensitivity Tests, Sequence Analysis, DNA, Drug Resistance, Bacterial, Protein Binding, Structure-Activity Relationship, Mutation, Adolescent, Adult, Middle Aged, India, Female, Male, Protein Stability, Young Adult
Sponsorship
American Leprosy Missions (unknown)
Wellcome Trust (200814/Z/16/Z)
Medical Research Council (MR/M026302/1)
Identifiers
External DOI: https://doi.org/10.1038/s41598-018-23423-1
This record's URL: https://www.repository.cam.ac.uk/handle/1810/282763
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