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Bacillus subtilis ComK negatively regulates degR gene expression

M Ogura1, T Tanaka

  • 1Department of Marine Science, School of Marine Science and Technology, Tokai University, Shimizu, Shizuoka, Japan.

Molecular & General Genetics : MGG
|March 26, 1997
PubMed
Summary

Bacillus subtilis degR gene expression is negatively controlled by ComK, which prevents sigmaD-driven transcription. MecA and MecB mutations relieve this repression, highlighting a novel regulatory pathway for exoprotease production.

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Area of Science:

  • Molecular Biology
  • Microbial Genetics
  • Gene Regulation

Background:

  • Exoprotease production in Bacillus subtilis is primarily regulated by the DegS-DegU two-component system.
  • The degR gene product is a minor factor positively influencing exoprotease production in a DegS-DegU-dependent manner.
  • Previous studies indicated sigmaD as the alternative sigma factor responsible for degR transcription.

Purpose of the Study:

  • To elucidate the regulatory mechanism controlling degR gene transcription in Bacillus subtilis.
  • To investigate the roles of mecA, mecB, and comK genes in degR expression.
  • To understand how MecA, MecB, and ComK interact to modulate sigmaD-dependent transcription.

Main Methods:

  • Genetic analysis involving gene disruption (mutations) in Bacillus subtilis strains.

Related Experiment Videos

  • Analysis of degR gene transcription under different genetic conditions (mecA, mecB, comK disruptions).
  • Comparison of degR expression driven by native sigmaD-dependent and artificial sigmaA-dependent promoters.

    • Main Results:

    • Disruption of mecA or mecB prevented degR transcription, an effect relieved by further comK disruption.
    • The negative effect of mecA/B mutations on degR transcription is dependent on a specific upstream region (-52).
    • MecA/B mutations negatively regulate ComK, leading to enhanced comK expression, which in turn represses degR transcription via sigmaD.

    Conclusions:

    • ComK acts as a negative regulator of degR expression by inhibiting sigmaD-driven transcription.
    • The MecA and MecB proteins negatively regulate ComK, indirectly influencing degR expression.
    • This study reveals a novel regulatory cascade (MecA/B → ComK → sigmaD → degR) controlling exoprotease production in Bacillus subtilis.