Identifying Inhibitor Targets in Mycobacteria by Activity-Based Probe Profiling.

Area of Science:

• Biochemistry
• Proteomics
• Microbiology

Background:

• Activity-based protein profiling (ABPP) is a powerful technique for studying protein function.
• Mycobacterium tuberculosis (Mtb) causes tuberculosis, a significant global health concern.
• Identifying Mtb-specific targets is crucial for developing new anti-tubercular therapies.

Purpose of the Study:

• To apply ABPP for identifying serine hydrolase inhibitor targets in Mtb.
• To adapt stable isotope labeling of amino acids (SILAC) for use in Mtb.
• To optimize proteomics analysis for SILAC-labeled Mtb.

Main Methods:

• Utilized ABPP with chemical probes to label active serine hydrolases in Mtb.
• Adapted SILAC by using an isotopically labeled nitrogen source in a modified Mtb growth medium.
• Developed specialized proteomics workflows to analyze SILAC-labeled Mtb samples.

Main Results:

• Successfully identified several putative serine hydrolase targets in Mtb.
• Demonstrated the feasibility of SILAC-based quantitative proteomics in Mtb.
• Characterized the specific requirements for analyzing SILAC-labeled Mtb proteomes.

Conclusions:

• ABPP is effective for discovering drug targets in Mtb.
• SILAC-based proteomics can be successfully applied to Mtb research.
• This methodology provides a foundation for further drug discovery efforts against Mtb.