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Journal of Bacteriology, January 1999, p. 426-433, Vol. 181, No. 2
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Regulation of Hexuronate Utilization in Bacillus subtilis

Kathleen R. Mekjian, Edward M. Bryan,dagger Bernard W. Beall,Dagger and Charles P. Moran Jr.*

Department of Microbiology and Immunology, Emory University School of Medicine, Atlanta, Georgia 30322

Received 8 September 1998/Accepted 5 November 1998

We have identified a locus essential for galacturonate utilization in Bacillus subtilis. Genes homologous to Escherichia coli and Erwinia chrysanthemi glucuronate and galacturonate metabolic genes were found in a cluster consisting of 10 open reading frames (ORFs) in the B. subtilis chromosome. A mutant of B. subtilis containing a replacement of the second and third ORFs was unable to grow with galacturonate as its primary carbon source. Galacturonate induced expression from a sigma A-dependent promoter, exuP1, located upstream from the first ORF. The eighth ORF in this cluster (the exu locus) encodes a LacI and GalR homolog that negatively regulated expression from exuP1. A 26-bp inverted repeat sequence centered 15 bp downstream from the exuP1 start point of transcription acted in cis to negatively regulate expression from exuP1 under noninducing conditions. Expression from the exuP1 promoter was repressed by high levels of glucose, which is probably mediated by CcpA (catabolite control protein A). A sigma E-dependent promoter, exuP2, was localized between the second and third ORFs and was active during sporulation.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, Emory University School of Medicine, Atlanta, GA 30322. Phone: (404) 727-5969. Fax: (404) 727-3659. E-mail: Moran{at}microbio.emory.edu.

dagger Present address: Department of Microbiology, University of Minnesota, Minneapolis, MN 55455.

Dagger Present address: Respiratory Diseases Branch, Centers for Disease Control and Prevention, Atlanta, GA 30333.

Journal of Bacteriology, January 1999, p. 426-433, Vol. 181, No. 2
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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