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Infect Immun. 1992 February; 60(2): 472-478

Vibrio cholerae hemagglutinin/protease, colonial variation, virulence, and detachment.

Department of Molecular Microbiology and Immunology, School of Medicine, University of Missouri, Columbia 65212.

ABSTRACT

The structural gene, hap, for the secreted hemagglutinin/protease (HA/protease), a putative virulence factor of Vibrio cholerae, has recently been cloned and sequenced (C. C. Häse and R. A. Finkelstein, J. Bacteriol. 173:3311-3317, 1991). The availability of the null mutant, HAP-1, and HAP-1 complemented with pCH2 (which expresses HA/protease), enabled an examination of the role of HA/protease in the virulence of V. cholerae in an animal model. However, the mutants exhibited reversible colonial variation similar but not identical to that which was previously associated with dramatic changes in virulence of parental strain 3083. Regardless of colonial morphology, the mutants were found to be fully virulent in infant rabbits. Thus, the HA/protease is not a primary virulence factor (for infant rabbits). Observations using cultured human intestinal cells indicated, instead, that the HA/protease is responsible for detachment of the vibrios from the cultured cells by digestion of several putative receptors for V. cholerae adhesins.

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