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Journal of Bacteriology, May 1999, p. 2966-2969, Vol. 181, No. 9
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Phosphorylation of HPr and Crh by HprK, Early Steps in the Catabolite Repression Signalling Pathway for the Bacillus subtilis Levanase Operon

Isabelle Martin-Verstraete,1,* Josef Deutscher,2 and Anne Galinier3

Unité de Biochimie Microbienne, CNRS URA 1300, Institut Pasteur, F-75724 Paris,1 Laboratoire de Génétique des Microorganismes, INRA-CNRS ERS 567, F-78850 Thiverval-Grignon,2 and Institut de Biologie et Chimie des Protéines, CNRS UPR 412, F-69367 Lyon Cedex 07,3 France

Received 22 December 1998/Accepted 17 February 1999

Carbon catabolite repression (CCR) of Bacillus subtilis catabolic genes is mediated by CcpA and in part by P-Ser-HPr. For certain operons, Crh, an HPr-like protein, is also implicated in CCR. In this study we demonstrated that in ptsH1 crh1 and hprK mutants, expression of the lev operon was completely relieved from CCR and that both P-Ser-HPr and P-Ser-Crh stimulated the binding of CcpA to the cre sequence of the lev operon.

* Corresponding author. Present address: Unité de Régulation de l'Expression Génétique, CNRS URA1129, Institut Pasteur, F-75724 Paris, France. Phone: 33-1-45688445. Fax: 31-1-45688948. E-mail: iverstra{at}pasteur.fr.

Journal of Bacteriology, May 1999, p. 2966-2969, Vol. 181, No. 9
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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