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Journal of Bacteriology, December 2000, p. 6983-6991, Vol. 182, No. 24
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Characterization of the sigma B Regulon in Staphylococcus aureus

Silke Gertz,1 Susanne Engelmann,1 Roland Schmid,2 Anne-Kathrin Ziebandt,1 Karsten Tischer,1 Christian Scharf,1 Jörg Hacker,3 and Michael Hecker1,*

Institut für Mikrobiologie und Molekularbiologie, D-17487 Greifswald,1 FB5 AG Mikrobiologie, Universität Osnabrück, D-49069 Osnabrück,2 and Institut für Molekulare Infektionsbiologie, Universität Würzburg, D-97070 Würzburg,3 Germany

Received 19 June 2000/Accepted 20 September 2000

The sigma B-dependent stress regulon in gram-positive bacteria might fulfill a physiological role in stress response and virulence similar to that of the sigma S regulon in Escherichia coli and other gram-negative bacteria. In order to obtain evidence for the function of the sigma B regulon of Staphylococcus aureus, especially in virulence control, sigma B-dependent stress genes were identified. The two-dimensional protein pattern of wild-type cells of S. aureus COL was compared with that of an isogenic sigB mutant. By this approach, we found that the synthesis of about 27 cytoplasmic proteins seemed to be under the positive control of sigma B. N-terminal sequencing of 18 proteins allowed the identification of their genes on the almost finished genome sequence of S. aureus COL and the analysis of the promoter structure. Transcriptional analyses of 11 of these genes confirmed their sigma B dependency, and moreover, about 7 additional sigma B-dependent genes were found which are cotranscribed with the newly detected genes, forming operons. Altogether, we identified 23 sigma B-dependent genes and their corresponding proteins. Among them are proteins probably involved in the generation of NADH or in membrane transport mechanisms. Furthermore, at least one clpC-homologous gene was localized on the S. aureus sequence solely transcribed by sigma B. In contrast, a second clpC-homologous gene in S. aureus forming an operon with ctsR, yacH, and yacI was sigma B independently expressed.

* Corresponding author. Mailing address: Institut für Mikrobiologie und Molekularbiologie, Jahnstrasse 15, D-17487 Greifswald, Germany. Phone: 49 3834 864200. Fax: 49 3834 864202. E-mail: hecker{at}microbio7.biologie.uni-greifswald.de.

Journal of Bacteriology, December 2000, p. 6983-6991, Vol. 182, No. 24
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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