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Updated: Apr 21, 2026
A High-throughput Compatible Assay to Evaluate Drug Efficacy against Macrophage Passaged Mycobacterium tuberculosis
Published on: March 24, 2017
[Quantitative proteomics analysis of ClpS-mediated rifampicin resistance in Mycobacterium]
Abstract:
Adaptor protein ClpS is an essential regulator of prokaryotic ATP-dependent protease ClpAP, which delivers certain protein substrates with specific amino acid sequences to ClpAP for degradation. However, ClpS also functions as the inhibitor of the ClpAP-mediated protein degradation for other proteins. Here, we constructed the clpS-overexpression Mycobacterium smegmatis strain, and showed for the first time that overexpression of ClpS increased the resistance of M. smegmatis to rifampicin that is one of most widely used antibiotic drugs in treatment of tuberculosis. Using quantitative proteomic technology, we systematically analyzed effects of ClpS overexpression on changes in M. smegmatis proteome, and proposed that the increased rifampicin resistance was caused by ClpS-regulated drug sedimentation and drug metabolism. Our results indicate that the changes in degradation related proteins enhanced drug resistance and quantitative proteomic analysis is an important tool for understanding molecular mechanisms responsible for bacteria drug resistance.
Insights
Overexpressing ClpS in Mycobacterium smegmatis enhances antibiotic resistance by altering protein degradation pathways. This study reveals ClpS
Area of Science:
- Microbiology
- Molecular Biology
- Proteomics
Background:
- ClpS is an adaptor protein regulating the prokaryotic ATP-dependent protease ClpAP.
- ClpS can both deliver substrates for and inhibit ClpAP-mediated protein degradation.
Purpose of the Study:
- To investigate the effect of ClpS overexpression on Mycobacterium smegmatis.
- To determine if ClpS overexpression influences antibiotic resistance in M. smegmatis.
- To elucidate the molecular mechanisms underlying ClpS-mediated changes in drug resistance.
Main Methods:
- Construction of a clpS-overexpressing Mycobacterium smegmatis strain.
- Quantitative proteomic analysis to assess global proteome changes.
- Assessment of M. smegmatis resistance to rifampicin.
Main Results:
- ClpS overexpression significantly increased M. smegmatis resistance to rifampicin.
- Proteomic analysis revealed alterations in protein degradation pathways.
- Proposed mechanisms include ClpS-regulated drug sedimentation and metabolism.
Conclusions:
- ClpS plays a crucial role in modulating antibiotic resistance in M. smegmatis.
- Changes in protein degradation machinery contribute to enhanced drug resistance.
- Quantitative proteomics is valuable for understanding bacterial drug resistance mechanisms.
