1887

Abstract

The potential of the major structural protein of type 1 fimbriae as a display system for heterologous sequences was tested. As a reporter-epitope, a heterologous sequence mimicking a neutralizing epitope of the cholera toxin B chain was inserted, in one or two copies, into four different positions in the gene. This was carried out by introduction of new restriction sites by PCR-mediated site-directed mutagenesis of in positions predicted to correspond to optimally surface-located regions of the subunit protein. Subsequently, the synthetic cholera-toxin-encoding DNA segment was inserted. Several of the chosen positions seemed amenable even for large foreign inserts; the chimeric proteins were exposed on the bacterial surface and the cholera toxin epitope was authentically displayed, i.e. it was recognized on bacteria by specific antiserum. Display of chimeric fimbriae was tested with respect to host background in three different strains, i.e. an isogenic set of K-12 strains, differing in the presence of an indigenous gene cluster, as well as a wild-type isolate. Immunization of rabbits with purified chimeric fimbriae resulted in serum which specifically recognized cholera toxin B chain, confirming the utility of the employed strategy.

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/content/journal/micro/10.1099/00221287-143-6-2027
1997-06-01
2019-11-12
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http://instance.metastore.ingenta.com/content/journal/micro/10.1099/00221287-143-6-2027
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