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Journal of Bacteriology, March 2001, p. 1716-1726, Vol. 183, No. 5
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.5.1716-1726.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

VpsR, a Member of the Response Regulators of the Two-Component Regulatory Systems, Is Required for Expression of vps Biosynthesis Genes and EPSETr-Associated Phenotypes in Vibrio cholerae O1 El Tor

Fitnat H. Yildiz,* Nadia A. Dolganov, and Gary K. Schoolnik

Department of Medicine, Division of Infectious Diseases and Geographic Medicine, and Department of Microbiology and Immunology, Stanford University Medical School, Stanford, California 94305

Received 31 July 2000/Accepted 29 November 2000

The rugose colonial variant of Vibrio cholerae O1 El Tor produces an exopolysaccharide (EPSETr) that enables the organism to form a biofilm and to resist oxidative stress and the bactericidal action of chlorine. Transposon mutagenesis of the rugose variant led to the identification of vpsR, which codes for a homologue of the NtrC subclass of response regulators. Targeted disruption of vpsR in the rugose colony genetic background yielded a nonreverting smooth-colony morphotype that produced no detectable EPSETr and did not form an architecturally mature biofilm. Analysis of two genes, vpsA and vpsL, within the vps cluster of EPSETr biosynthesis genes revealed that their expression is induced above basal levels in the rugose variant, compared to the smooth colonial variant, and requires vpsR. These results show that VpsR functions as a positive regulator of vpsA and vpsL and thus acts to positively regulate EPSETr production and biofilm formation.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, Stanford University Medical School, Stanford, CA 94305. Phone: (650) 723-7026. Fax: (650) 723-1399. E-mail: fitnat{at}cmgm.stanford.edu.

Journal of Bacteriology, March 2001, p. 1716-1726, Vol. 183, No. 5
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.5.1716-1726.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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