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Comparative Study | Journal Article | Research Support, Non-U.S. Gov't

Vibrio cholerae Hcp, a secreted protein coregulated with HlyA.

S G Williams, L T Varcoe, S R Attridge, P A Manning
S G Williams
Department of Microbiology and Immunology, University of Adelaide, Australia.
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L T Varcoe
Department of Microbiology and Immunology, University of Adelaide, Australia.
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S R Attridge
Department of Microbiology and Immunology, University of Adelaide, Australia.
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P A Manning
Department of Microbiology and Immunology, University of Adelaide, Australia.
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ABSTRACT

Hcp is a 28-kDa secreted protein of Vibrio cholerae regulated coordinately with the hemolysin, HlyA. Both proteins show a dependence on HlyU for expression, suggesting that Hcp may be secreted by V. cholerae in vivo. We have identified and sequenced two genes for Hcp, designated hcpA and hcpB (hemolysin-coregulated protein). The genes encode identical amino acid sequences. Both express a 28-kDa protein, despite open reading frames with only a 19-kDa capacity, suggesting that the Hcp protein runs aberrantly on polyacrylamide gel electrophoresis. There is no cleavage involved in secretion of Hcp from the cell, suggesting a novel mechanism of secretion. An hcp null mutant was constructed, and this strain displayed no deficiency in virulence or colonization in the infant mouse cholera model. From sequence data and primer extension analysis, we predict that the hcp promoter is the sigma 54 type, with a candidate integration host factor binding site upstream. Although hcp and hlyA are coregulated by HlyU, there are no obvious similarities between their promoters. We predict that an intermediate regulator may be involved in the activation of hcp by HlyU. This raises the possibility that HlyU is part of a regulatory cascade.

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Vibrio cholerae Hcp, a secreted protein coregulated with HlyA.
S G Williams, L T Varcoe, S R Attridge, P A Manning
Infection and Immunity Jan 1996, 64 (1) 283-289; DOI:

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Vibrio cholerae Hcp, a secreted protein coregulated with HlyA.
S G Williams, L T Varcoe, S R Attridge, P A Manning
Infection and Immunity Jan 1996, 64 (1) 283-289; DOI:
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