Post-translational regulation via Clp protease is critical for survival of Mycobacterium tuberculosis. Academic Article uri icon

Overview

abstract

  • Unlike most bacterial species, Mycobacterium tuberculosis depends on the Clp proteolysis system for survival even in in vitro conditions. We hypothesized that Clp is required for the physiologic turnover of mycobacterial proteins whose accumulation is deleterious to bacterial growth and survival. To identify cellular substrates, we employed quantitative proteomics and transcriptomics to identify the set of proteins that accumulated upon the loss of functional Clp protease. Among the set of potential Clp substrates uncovered, we were able to unambiguously identify WhiB1, an essential transcriptional repressor capable of auto-repression, as a substrate of the mycobacterial Clp protease. Dysregulation of WhiB1 turnover had a toxic effect that was not rescued by repression of whiB1 transcription. Thus, under normal growth conditions, Clp protease is the predominant regulatory check on the levels of potentially toxic cellular proteins. Our findings add to the growing evidence of how post-translational regulation plays a critical role in the regulation of bacterial physiology.

publication date

  • March 6, 2014

Research

keywords

  • Bacterial Proteins
  • Endopeptidase Clp
  • Mycobacterium tuberculosis
  • Protein Processing, Post-Translational
  • Transcription Factors

Identity

PubMed Central ID

  • PMC3946367

Scopus Document Identifier

  • 84897415455

Digital Object Identifier (DOI)

  • 10.1016/j.cell.2009.04.041

PubMed ID

  • 24603869

Additional Document Info

volume

  • 10

issue

  • 3