Abstract
The nucleotide sequences of five open reading frames within the Vibrio cholerae NAGV14 type IV pilus gene cluster were determined. The genes showed high homology to the mannose-sensitive hemagglutinin (MSHA) pilus genes mshB, mshC, mshD, mshO and mshP. PCR analysis showed that a MSHA-like gene cluster is highly conserved among different V. cholerae strains, with the exception of the previously reported major pilin subunit. Recombinant MshB and MshO proteins were purified and specific antiserum was raised to each of them. Western blotting analyses showed that these antisera reacted with purified NAGV14 and MSHA pili. The results suggested that MshB and MshO are minor components of the pilus fiber. Although there was no cross-reaction between the major pilin subunits of NAGV14 and MSHA pili, minor components seemed to be highly homologous and immunologically cross-reactive.
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