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1.
Sci Rep ; 8(1): 8250, 2018 May 23.
Artigo em Inglês | MEDLINE | ID: mdl-29789675

RESUMO

A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has not been fixed in the paper.

2.
Sci Rep ; 8(1): 5016, 2018 03 22.
Artigo em Inglês | MEDLINE | ID: mdl-29567948

RESUMO

The rpoB gene encodes the ß 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.


Assuntos
Proteínas de Bactérias/genética , RNA Polimerases Dirigidas por DNA/genética , Farmacorresistência Bacteriana/genética , Hansenostáticos/farmacologia , Hanseníase/tratamento farmacológico , Mycobacterium leprae/genética , Rifampina/farmacologia , Adolescente , Adulto , DNA Bacteriano/genética , Feminino , Humanos , Índia , Hansenostáticos/uso terapêutico , Hanseníase/microbiologia , Masculino , Testes de Sensibilidade Microbiana , Pessoa de Meia-Idade , Mutação , Mycobacterium leprae/efeitos dos fármacos , Mycobacterium leprae/isolamento & purificação , Ligação Proteica/genética , Estabilidade Proteica/efeitos dos fármacos , Recidiva , Rifampina/uso terapêutico , Análise de Sequência de DNA , Relação Estrutura-Atividade , Resultado do Tratamento , Adulto Jovem
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