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Journal of Bacteriology, May 1999, p. 3288-3292, Vol. 181, No. 10
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Regulation of beta -Galactosidase Expression in Bacillus megaterium DSM319 by a XylS/AraC-Type Transcriptional Activator

Jan Strey, Klaus D. Wittchen, and Friedhelm Meinhardt*

Institut für Mikrobiologie, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany

Received 7 December 1998/Accepted 15 March 1999

The beta -galactosidase-encoding bgaM gene of Bacillus megaterium DSM319 and the divergently orientated bgaR operon were isolated and sequenced. Both traits are subject to catabolite repression. A set of single-gene replacement mutants was generated and used to analyze gene function. BgaR was found to be a XylS/AraC-type positive transcriptional regulator of bgaM; a potential regulator binding site overlaps the bgaM promoter. A mechanism for regulation of beta -galactosidase expression in B. megaterium is proposed.

* Corresponding author. Mailing address: Institut für Mikrobiologie, Westfälische Wilhelms-Universität Münster, Corrensstr. 3, 48149 Münster, Germany. Phone: 49 251 83-39825. Fax: 49 251 83-38388. E-mail: meinhar{at}uni-muenster.de.

Journal of Bacteriology, May 1999, p. 3288-3292, Vol. 181, No. 10
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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