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Mycobacterium bovis BCG response regulator essential for hypoxic dormancy
1Mycobacterium Biology Laboratory, Institute of Molecular and Cell Biology, Singapore 117609, Republic of Singapore.
Journal of Bacteriology
|November 26, 2002
Summary
The DosR regulator is essential for Mycobacterium bovis BCG survival during oxygen starvation, enabling adaptation to hypoxia and regulating dormancy proteins crucial for tuberculosis persistence.
Area of Science:
- Microbiology
- Molecular Biology
- Tuberculosis Research
Background:
- Mycobacterium bovis BCG can enter a dormant state to survive hypoxia.
- Dormancy confers resistance to antimycobacterials, potentially contributing to tuberculosis treatment failure.
- Previous proteomic analysis identified upregulated proteins during dormancy.
Purpose of the Study:
- To investigate the role of the Rv3133c gene in Mycobacterium bovis BCG dormancy.
- To determine if Rv3133c is essential for survival under oxygen-limited conditions.
- To elucidate the regulatory role of Rv3133c in the dormancy response.
Main Methods:
- Gene disruption of Rv3133c using a kanamycin resistance cassette.
- Culture of wild-type and mutant strains under oxygen-limited conditions.
- Proteomic analysis using two-dimensional gel electrophoresis.
Main Results:
- Loss-of-function mutants of Rv3133c (named dosR) failed to survive oxygen starvation.
- Disruption of dosR abolished the induction of three other dormancy-associated proteins.
- DosR is required for the upregulation of these dormancy proteins.
Conclusions:
- DosR is a critical regulator for Mycobacterium bovis BCG adaptation to hypoxia.
- DosR controls the expression of key proteins involved in mycobacterial dormancy.
- DosR plays a vital role in the survival of tubercle bacilli under oxygen-deprived conditions.