Functional characterization of the FimH adhesin from Salmonella enterica serovar Enteritidis

Microbiology
Dagmara KisielaMaciej Ugorski

Abstract

Salmonella enterica serovar Enteritidis has emerged during the last 20 years as the major causative agent of food-borne gastroenteritis in humans and as the major infectious agent on poultry farms, replacing Salmonella enterica serovar Typhimurium as the dominant pathogenic serovar. Because adhesion to gut tissues and colonization of the alimentary tract, mediated in large part by the FimH adhesins located on type 1 fimbriae, is an important stage in the pathogenesis of both serovars, the binding properties of the FimH adhesins from these two enteropathogens were compared. Salmonella Enteritidis FimH protein and the Salmonella Typhimurium low-adhesive variant of this adhesin were expressed in Escherichia coli and the recombinant proteins were analysed for their ability to bind glycoproteins carrying different oligomannosidic structures and different types of eukaryotic cells. In static binding assays (ELISA and Western blotting) both FimH proteins bound equally well to all three tested glycoproteins (RNase B, horseradish peroxidase and mannan-BSA). In addition, no differences were found in the binding specificity of the FimH proteins and intact cells of Salmonella Enteritidis and Salmonella Typhimurium to human colon carcinoma ...Continue Reading

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Apr 1, 2010·Future Microbiology·Isabel Martinez-Argudo, Mark A Jepson
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