A Sigma E Dependent Operon Subject to Catabolite Repression During Sporulation in Bacillus Subtilis

Overview

Journal J Bacteriol

Publisher American Society for Microbiology

Specialty Microbiology

Date 1996 Aug 1

PMID 8759838

Citations 16

Authors

E M Bryan

B W Beall

C P Moran Jr

Affiliations

Soon will be listed here.

Abstract

To identify genes expressed at intermediate stages of Bacillus subtilis sporulation, we screened for sigma E-dependent promoters. One promoter that we found drives expression of an operon consisting of at least five open reading frames (ORFs). The predicted products of the first three ORFs are very homologous to enzymes involved in fatty acid metabolism, including acetyl coenzyme A (acetyl-CoA) acetyltransferase (thiolase), 3-hydroxybutyryl-CoA dehydrogenase, and acyl-CoA dehydrogenase, respectively. We showed that the fourth ORF encoded a third isozyme of citrate synthase in B. subtilis. Genetic evidence and primer extension results showed that transcription of this operon is directed by the mother cell compartment-specific sigma factor, sigma E, and so the operon was named mmg (for mother cell metabolic genes). Furthermore, we found that a sequence (mmgO) with homology to a catabolite-responsive element mediates glucose repression of mmg promoter activity during sporulation and that this repression was lost in a ccpA mutant.

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