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J. Bacteriol., Sep 1997, 5494-5501, Vol 179, No. 17
Copyright © 1997, American Society for Microbiology

Expression of the Bacillus subtilis ureABC operon is controlled by multiple regulatory factors including CodY, GlnR, TnrA, and Spo0H

LV Wray Jr, AE Ferson and SH Fisher
Department of Microbiology, Boston University School of Medicine, Massachusetts 02118, USA.

Expression of urease, which is encoded by the ureABC operon, is regulated in response to nitrogen availability in Bacillus subtilis. Three ureABC promoters were identified in primer extension experiments and by examination of beta-galactosidase expression from ure-lacZ fusions. P1, a low-level constitutive promoter, lies immediately upstream of ureA. The P2 promoter is transcribed by the E sigmaH form of RNA polymerase and initiates transcription 270 bp upstream of the ureA start codon. The transcriptional start site for the sigmaA- dependent P3 promoter is located 839 bp upstream of the ureA start codon. To identify transcription factors that control ureABC expression, regulation of the P2 and P3 promoters was examined in wild- type and mutant strains. During rapid growth in minimal medium containing glucose and amino acids, CodY represses expression of the P2 and P3 promoters 30- and 60-fold, respectively. TnrA activates expression of the P3 promoter 10-fold in nitrogen-limited cells, while GlnR represses transcription from the P3 promoter 55-fold during growth on excess nitrogen. Expression of the ureABC operon increases 10-fold at the end of exponential growth in nutrient sporulation medium. This elevation in expression results from the relief of CodY-mediated repression during exponential growth and increased sigmaH-dependent transcription during stationary phase.


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