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VpsT Is a Transcriptional Regulator Required for Expression of vps Biosynthesis Genes and the Development of Rugose Colonial Morphology in Vibrio cholerae O1 El Tor

Department of Environmental Toxicology, University of California at Santa Cruz, Santa Cruz, California 95064

Received 17 June 2003/ Accepted 25 November 2003

Vibrio cholerae switches between smooth and rugose colonial variants. The rugose variant produces more vibrio polysaccharides (VPS^{El Tor}) and forms well-developed biofilms. Both phenotypes depend on expression of vps biosynthesis genes. We identified a positive transcriptional regulator of vps gene expression, VpsT, which is homologous to response regulators of two-component regulatory systems. Disruption of vpsT in the rugose variant yields smooth colonies, prevents formation of mature biofilms, and decreases vps gene expression. The interaction between VpsT and VpsR, a previously identified positive regulator of vps genes, was also investigated.

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