4.6 Article

rpoB Mutations and Effects on Rifampin Resistance in Mycobacterium tuberculosis

Journal

INFECTION AND DRUG RESISTANCE
Volume 14, Issue -, Pages 4119-4128

Publisher

DOVE MEDICAL PRESS LTD
DOI: 10.2147/IDR.S333433

Keywords

Mycobacterium tuberculosis; rifampin resistance; structure; mutation

Funding

  1. National Key Program of Mega Infectious Diseases [2018ZX10302302-001]
  2. National Basic Research Program of China (973 Program) [2015CB554202]

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The study identified 34 mutations within the rpoB gene, with 25 of them altering structural interactions with RIF and contributing to resistance. Specific mutations such as S450L, H445D, H445Y, H445R were associated with high-level resistance, while D435V was linked to moderate resistance.
Objective: To investigate the mutations within the whole rpoB gene of Mycobacterium tuberculosis and analyze their effects on rifampin (RIF) resistance based on crystal structure. Methods: We sequenced the entire rpoB gene in 175 tuberculosis isolates and quantified their minimum inhibitory concentrations using microplate-based assays. Additionally, the structural interactions between wild-type/mutant RpoB and RIF were also analyzed. Results: Results revealed that a total of 34 mutations distributed across 17 different sites within the whole rpoB gene were identified. Of the 34 mutations, 25 could alter the structural interaction between RpoB and RIF and contribute to RIF resistance. Statistical analysis showed that S450L, H445D, H445Y and H445R mutations were associated with high-level RIF resistance, while D435V was associated with moderate-level RIF resistance. Conclusion: Some mutations within the rpoB gene could affect the interaction between RpoB and RIF and thus are associated with RIF resistance. These findings could be helpful to design new antibiotics and develop novel diagnostic tools for drug resistance in TB.

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