1887

Abstract

of both biotypes produce a soluble Zn-dependent metalloprotease: haemagglutinin/protease (Hap), encoded by . Hap has been shown to have mucinolytic and cytotoxic activity. These activities are likely to play an important role in the pathogenesis of cholera and the reactogenicity of attenuated vaccine strains. Production of Hap requires transcriptional activation by the HapR regulator and is repressed by glucose. The present study shows that mucin purified from two sources, bile salts, and growth at 37 °C enhanced Hap protease production. Analysis of and promoter fusions with the gene showed both promoters to be activated in a cell-density-dependent pattern. Glucose repressed and mucin induced the promoter by a HapR-independent mechanism. Bile had no effect on either or promoter activity. Expression of was required for vibrios to translocate through a mucin-containing gel. These results suggest Hap to play an important role in cholera pathogenesis by promoting mucin gel penetration, detachment and spreading of infection along the gastrointestinal tract.

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2003-07-01
2019-10-22
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