Binding specificity of Salmonella plasmid-encoded fimbriae assessed by glycomics.

The Journal of Biological Chemistry
Daniela ChessaAndreas J Bäumler

Abstract

The Salmonella enterica serotype Typhimurium (S. Typhimurium) genome encodes 12 intestinal colonization factors of the chaperone/usher fimbrial assembly class; however, the binding specificity is known for only one of these adhesins, known as type 1 fimbriae. Here we explored the utility of glycomics to determine the carbohydrate binding specificity of plasmid-encoded fimbriae from S. Typhimurium. A cosmid carrying the pef operon was introduced into Escherichia coli and expression of fimbrial filaments composed of PefA confirmed by flow cytometry and immune-electron microscopy. Plasmid-encoded fimbriae were purified from the surface of E. coli, and the resulting preparation was shown to contain PefA as the sole major protein component. The binding of purified plasmid-encoded fimbriae to a glycanarray suggested that this adhesin specifically binds the trisaccharide Galbeta1-4(Fucalpha1-3)GlcNAc, also known as the Lewis X (Le(x)) blood group antigen. Results from the glycanarray were validated by enzyme-linked immunosorbent assay (ELISA) in which plasmid-encoded fimbriae bound Le(x)-coated wells in a concentration-dependent manner. The binding of plasmid-encoded fimbriae to Le(x)-coated wells could be inhibited by co-incubation w...Continue Reading

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Citations

Sep 24, 2013·The EMBO Journal·Torsten SterzenbachAndreas J Bäumler
Feb 6, 2015·Frontiers in Microbiology·Agnès WiedemannPhilippe Velge
Jun 26, 2009·FEMS Microbiology Letters·Matthew A Lambert, Stephen G J Smith
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