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. 1990 Jul;172(7):3780–3789. doi: 10.1128/jb.172.7.3780-3789.1990

The Yersinia enterocolitica inv gene product is an outer membrane protein that shares epitopes with Yersinia pseudotuberculosis invasin.

J C Pepe 1, V L Miller 1
PMCID: PMC213356  PMID: 1694524

Abstract

An essential virulence attribute for Yersinia enterocolitica and Yersinia pseudotuberculosis is the ability to invade the intestinal epithelium of mammals. The chromosomal invasin gene (inv) has been cloned from both of these Yersinia species, and the Y. pseudotuberculosis invasin has been well characterized (R. R. Isberg, D. L. Voorhis, and S. Falkow, Cell 50:769-778, 1987). Here we constructed TnphoA translational fusions to the Y. enterocolitica inv gene to identify, characterize, and localize the inv protein product in Escherichia coli. The cloned Y. enterocolitica inv locus encoded a unique protein of ca. 92 kilodaltons when expressed in minicells. A protein of comparable size was detected in immunoblots by using monoclonal antibodies directed against the Y. pseudotuberculosis invasin. This protein, which we also refer to as invasin, promoted both attachment to and invasion of cultured epithelial cells. These two functions were not genetically separable by insertional mutagenesis. We determined that the Y. enterocolitica invasin was localized on the outer membrane and that it was exposed on the bacterial cell surface, which may have implications for how invasin functions to mediate invasion.

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Selected References

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