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Journal of Bacteriology, December 1999, p. 7634-7638, Vol. 181, No. 24
Lehrstuhl für Mikrobiologie,
Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen,1 and Laboratorium für
Mikrobiologie, Philipps-Universität Marburg and
Max-Planck-Institut für Terrestrische Mikrobiologie,
Marburg,2 Federal Republic of Germany
Received 26 April 1999/Accepted 1 October 1999
We identified five single amino acid exchanges in CcpA that lead to
permanent repression of the xylose utilization genes in the absence of
glucose. Other proteins from the CcpA regulon also show
glucose-independent regulation in the mutants. The mutant CcpA proteins
bind to the DNA target catabolite responsive elements without the
corepressor HPr-Ser-P.
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Mutations in Catabolite Control Protein CcpA
Showing Glucose-Independent Regulation in Bacillus
megaterium

*
Corresponding author. Mailing address: Lehrstuhl
für Mikrobiologie, Friedrich-Alexander-Universität
Erlangen-Nürnberg, Staudtstr. 5, 91058 Erlangen, Federal Republic
of Germany. Phone: 49-9131-8528081. Fax: 49-9131-8528082. E-mail:
whillen{at}biologie.uni-erlangen.de.
Present address: Department of Biology, Massachusetts Institute of
Technology, Cambridge, Massachusetts.
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