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α-Methylacyl-CoA Racemase from Mycobacterium tuberculosis-Detailed Kinetic and Structural Characterization of the
Otsile O Mojanaga1, Timothy J Woodman1, Matthew D Lloyd1
1Department of Life Sciences, University of Bath, Claverton Down, Bath BA2 7AY, UK.
Biomolecules
|March 28, 2024
Summary
α-Methylacyl-CoA racemase (MCR) from Mycobacterium tuberculosis is crucial for bacterial survival. Crystal structures reveal how mutations disrupt its catalytic site, offering insights for developing new anti-tuberculosis drugs.
Area of Science:
- Biochemistry
- Structural Biology
- Microbiology
Background:
- α-Methylacyl-CoA racemase (MCR) in Mycobacterium tuberculosis is vital for fatty acid metabolism and cholesterol utilization.
- MCR's role in bacterial survival and persistence makes it a potential therapeutic target.
Purpose of the Study:
- To elucidate the structural and catalytic properties of wild-type MCR and key active-site mutants.
- To provide a structural basis for understanding MCR's enzymatic function and guide the development of anti-tuberculosis agents.
Main Methods:
- High-resolution X-ray crystallography of wild-type MCR and H126A, D156A, E241A mutants.
- Detailed kinetic analysis of the characterized MCR variants.
Main Results:
- Determined crystal structures of wild-type MCR (1.65 Å) and mutants (2.45 Å, 1.64 Å, 1.85 Å).
- Observed no significant structural changes outside the active site in mutants.
- Mutations H126A, D156A, and E241A significantly reduced catalytic activity by disrupting the catalytic apparatus, including hydrogen bonding and water-mediated interactions.
Conclusions:
- The study provides detailed structural and biochemical data on MCR's catalytic mechanism.
- Understanding MCR's active site and the impact of mutations is crucial for designing novel anti-tuberculosis drugs targeting this essential enzyme.
