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. 1983 Sep;41(3):921–930. doi: 10.1128/iai.41.3.921-930.1983

Plasmid-mediated and temperature-regulated surface properties of Yersinia enterocolitica.

R J Martinez
PMCID: PMC264589  PMID: 6885171

Abstract

Enteropathogenic strains of Yersinia enterocolitica harbor a virulence plasmid which codes for a series of novel outer membrane proteins. The expression of these proteins on the outer membrane is temperature regulated: when cells are grown at 25 degrees C, these proteins are not exposed on the outer membrane, whereas they occur in high copy number when cells are grown at 37 degrees C. The majority of these proteins are externally exposed on the cell surface as evidenced by their susceptibility to proteolysis by exogenously added proteases. The expression of the plasmid-mediated proteins on the outer membrane does not favor adherence of the bacteria to intestinal epithelial cells in vitro. Cultures grown at 25 degrees C adhered to Henle cell monolayers, whereas those grown at 37 degrees C did so much less effectively. The presence of the proteins on the bacterial surface appears to be involved in rendering the cells resistant to the bactericidal effects of serum, i.e., 37 degrees C-grown cells were resistant to serum killing, and removal of the outer membrane proteins with pronase rendered them sensitive. Evidence is presented which strongly suggests that the plasmid-mediated proteins are synthesized and expressed on the cell surface either during or after transit of the ingested bacteria to the lamina propria. Some properties afforded to the cells by the outer membrane proteins are described.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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