Mycobacterium tuberculosis proteome microarray for global studies of protein function and immunogenicity

Area of Science:

• Microbiology
• Systems Biology
• Biotechnology

Background:

• A limited understanding of Mycobacterium tuberculosis (MTB) biology impedes the development of new tuberculosis (TB) drugs, vaccines, and diagnostics.
• Advanced experimental tools are crucial for systems-level investigations of MTB.

Purpose of the Study:

• To create a functional MTB proteome microarray and ORFome library for comprehensive pathogen research.
• To demonstrate the microarray's utility in exploring protein-protein interactions, small-molecule binding, and biomarker discovery.

Main Methods:

• Development of a functional MTB proteome microarray and an ORFome library.
• Application of the microarray to investigate global protein-protein interactions.
• Screening for small-molecule-protein binding, specifically for bis-(3'-5')-cyclic dimeric guanosine monophosphate (c-di-GMP).
• Serum biomarker discovery for differentiating active TB patients from recovered individuals.

Main Results:

• Identification of 59 proteins interacting with the serine/threonine kinase PknG.
• Discovery of 30 proteins that bind to c-di-GMP.
• Identification of 14 MTB proteins capable of distinguishing active TB from recovered states.
• Suggestive evidence for PknG and c-di-GMP regulation of the MTB rhamnose pathway.

Conclusions:

• The MTB proteome microarray is a versatile tool for systems-level analysis of the pathogen.
• This resource can accelerate the understanding of tuberculosis pathogenesis.
• The findings may lead to the development of more effective TB therapies.