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Journal of Bacteriology, October 2003, p. 6205-6208, Vol. 185, No. 20
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.20.6205-6208.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

The SKHR Motif Is Required for Biological Function of the VirR Response Regulator from Clostridium perfringens

Sheena McGowan, Jennifer R. O'Connor, Jackie K. Cheung, and Julian I. Rood*

Bacterial Pathogenesis Research Group, Department of Microbiology, Monash University, Victoria 3800, Australia

Received 3 July 2003/ Accepted 23 July 2003

The response regulator VirR and its cognate sensor histidine kinase, VirS, are responsible for toxin gene regulation in the human pathogen Clostridium perfringens. The C-terminal domain of VirR (VirRc) contains the functional FxRxHrS motif, which is involved in DNA binding and is conserved in many regulatory proteins. VirRc was cloned, purified, and shown by in vivo and in vitro studies to comprise an independent DNA binding domain. Random and site-directed mutagenesis was used to identify further amino acids that were required for the functional integrity of the protein. Random mutagenesis identified a unique residue, Met-172, that was required for biological function. Site-directed mutagenesis of the SKHR motif (amino acids 216 to 219) revealed that these residues were also required for biological activity. Analysis of the mutated proteins indicated that they were unable to bind to the DNA target with the same efficiency as the wild-type protein.

* Corresponding author. Mailing address: Department of Microbiology, Monash University, Victoria 3800, Australia. Phone: 61 3 9905 4825. Fax: 61 3 9905 4811. E-mail: julian.rood{at}med.monash.edu.au.

Journal of Bacteriology, October 2003, p. 6205-6208, Vol. 185, No. 20
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.20.6205-6208.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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