Mycobacterium tuberculosis uses intrinsically disordered, fast evolving proteins to interact with conserved host...

Area of Science:

• Microbiology
• Biophysics
• Genomics

Background:

• Intrinsically disordered protein regions (IDRs) are abundant in eukaryotes but understudied in bacteria.
• Their roles in bacterial processes, especially host-pathogen interactions, remain largely unknown.
• Mycobacterium tuberculosis, a pathogen of significant epidemiological relevance, serves as a model for this investigation.

Purpose of the Study:

• To investigate the characteristics and functions of IDRs in Mycobacterium tuberculosis.
• To explore the evolutionary dynamics and biophysical properties of bacterial IDRs.
• To compare bacterial IDRs with interacting human proteins in the context of host-pathogen interactions.

Main Methods:

• Benchmarking of various protein disorder prediction tools.
• Integration of multiple biological data levels for analysis.
• Comparative analysis of Mycobacterium tuberculosis IDRs and human interactome data.
• Extension of analysis to 540 human-infecting bacterial species.

Main Results:

• IDR-containing proteins in Mycobacterium tuberculosis are implicated in virulence, immune response modulation, and lipid metabolism.
• Bacterial IDRs exhibit rapid evolution and low antigenicity, with distinct sequence-ensemble-function relationships.
• Interacting human proteins are evolutionarily constrained and highly connected, suggesting a non-universal arms race paradigm.
• Significant variations in IDR content and properties exist across 540 human-infecting bacteria.

Conclusions:

• Bacterial IDRs contribute to virulence, host interaction, and immune response regulation.
• Mycobacterium tuberculosis may utilize IDRs for environmental sensing and interaction.
• A comprehensive database of bacterial IDRs and associated parameters is provided for public access.