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Identification of a new RTX-like gene cluster in Vibrio cholerae

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A gene cluster containing two genes in tandem has been identified in Vibrio cholerae ElTor N16961. Each has more than one cadherin domain and is homologous to the RTX toxin family and was common in various V. cholerae strains. Insertional mutagenesis demonstrated that each gene has a role in Hep-2 cell rounding, hemolytic activity towards human and sheep RBCs and biofilm formation. The mutants showed reduced adherence to intestinal epithelial cells as well as reduction of in vivo colonization in suckling mice. These two genes thus code for RTX-like toxins in V. cholerae and are associated with the pathogenecity of this organism.
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Keywords: RTX; Vibrio cholerae; adherence; biofilm; hemolytic activity; intestinal epithelial cells

Document Type: Research Article

Affiliations: Molecular & Human Genetics Division, Indian Institute of Chemical Biology, Kolkata, India

Publication date: 01 July 2008

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