Regulated expression of the dinR and recA genes during competence development and SOS induction in Bacillus subtilis

Bert Jan Haijema, Douwe Van Sinderen, Kevin Winterling, Jan Kooistra, Gerard Venema*, Leendert Willem Hamoen

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

It has been hypothesized that the dinR gene product of Bacillus subtilis acts as a repressor of the SOS regulon by binding to DNA sequences located upstream of SOS genes, including dinR and recA. Following activation as a result of DNA damage, RecA is believed to catalyse DinR-autocleavage, thus derepressing the SOS regulon. The present results support this hypothesis: a dinR insertion mutation caused a high, constitutive expression of both dinR and recA, which could not be further elevated by SOS-induction. In addition, gel-retardation assays demonstrated a direct interaction between the dinR gene product and the recA and dinR promoter regions. Epistatic interactions and gel-retardation assays demonstrated that the previously reported competence-specific expression of recA directly depended upon the gene product of comK, the competence transcription factor. These data demonstrate the existence of a direct regulatory link between the competence signal-transduction pathway and the SOS regulon.

Original languageEnglish
Pages (from-to)75-85
Number of pages11
JournalMolecular Microbiology
Volume22
Issue number1
DOIs
Publication statusPublished - 21 Oct 1996
Externally publishedYes

Fingerprint Dive into the research topics of 'Regulated expression of the dinR and recA genes during competence development and SOS induction in Bacillus subtilis'. Together they form a unique fingerprint.

  • Cite this