Proteomic Analysis of Mycobacterium tuberculosis Variants

Mycobacterium tuberculosis exhibits considerable strain‐to‐strain variation, encompassing differences in virulence, transmissibility and drug resistance. Proteomic analysis offers a window into these functional disparities by cataloguing and quantifying the full complement of proteins expressed by distinct variants. Advances in mass spectrometry–based workflows now permit high‐resolution profiling of cytosolic, membrane‐associated and secreted proteins under defined growth or stress conditions. Comparative studies have revealed signature changes in the abundance of toxin–antitoxin modules, cell envelope components and regulatory factors that underlie phenotypic traits such as persistence and antibiotic tolerance. Such findings inform the identification of novel diagnostic markers, vaccine antigens and therapeutic targets, and contribute to a systems‐level understanding of how genetic polymorphisms translate into functional adaptation. By integrating label‐free quantification, two‐dimensional electrophoresis and tandem mass spectrometric techniques, researchers are mapping strain‐specific proteomes at unprecedented depth, illuminating both conserved pathways and unique variant features with global public health relevance.

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Proteomic Analysis of Mycobacterium tuberculosis Variants publication trend

The graph below shows the total number of articles in proteomic analysis of mycobacterium tuberculosis variants across all publications each year (not limited to Nature Index journals).

Technical terms

Proteomics: The large-scale study of the complete set of proteins produced by an organism or system, encompassing identification and quantification under specific conditions.

Label-free quantification: A mass spectrometric approach to compare protein abundance across samples without chemical labelling, using ion intensity or spectral count as proxies.

Liquid chromatography–tandem mass spectrometry (LC–MS/MS): An analytical technique that separates peptide mixtures by chromatography and identifies them by successive stages of mass spectrometry.

MALDI-TOF/MS: Matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry, a method for rapid peptide mass fingerprinting and protein identification.

PE/PPE proteins: Two related families of mycobacterial surface proteins characterised by proline–glutamate (PE) or proline–proline–glutamate (PPE) motifs, implicated in antigenic variation and host immune modulation.

Esx proteins: Members of the ESAT-6 secretion system, small secreted proteins that play key roles in virulence and intercellular spread of Mycobacterium tuberculosis.

References

1. Proteomic Profiling of Mycobacterium tuberculosis Identifies Nutrient-starvation-responsive Toxin–antitoxin Systems*. Molecular & Cellular Proteomics (2013).
2. Comparative Proteomic Analyses of Avirulent, Virulent, and Clinical Strains of Mycobacterium tuberculosis Identify Strain-specific Patterns*. Journal of Biological Chemistry (2016).
3. Comparison of membrane proteins of Mycobacterium tuberculosisH37Rv and H37Ra strains. BMC Microbiology (2011).
4. Cytosolic Proteome Profiling of Aminoglycosides Resistant Mycobacterium tuberculosis Clinical Isolates Using MALDI-TOF/MS. Frontiers in Microbiology (2016).