The affinity of the FimH fimbrial adhesin is receptor‐driven and quasi‐independent of Escherichia coli pathotypes

Abstract

Summary Type‐1 fimbriae are important virulence factors for the establishment of Escherichia coli urinary tract infections. Bacterial adhesion to the high‐mannosylated uroplakin Ia glycoprotein receptors of bladder epithelium is mediated by the FimH adhesin. Previous studies have attributed differences in mannose‐sensitive adhesion phenotypes between faecal and uropathogenic E. coli to sequence variation in the FimH receptor‐binding domain. We find that FimH variants from uropathogenic, faecal and enterohaemorrhagic isolates express the same specificities and affinities for high‐mannose structures. The only exceptions are FimHs from O157 strains that carry a mutation (Asn135Lys) in the mannose‐binding pocket that abolishes all binding. A high‐mannose microarray shows that all substructures are bound by FimH and that the largest oligomannose is not necessarily the best binder. Affinity measurements demonstrate a strong preference towards oligomannosides exposing Manα1‐3Man at their non‐reducing end. Binding is further enhanced by the β1‐4‐linkage to GlcNAc, where binding is 100‐fold better than that of α‐ d ‐mannose. Manα1‐3Manβ1‐4GlcNAc, a major oligosaccharide present in the urine of α‐mannosidosis patients, thus constitutes a well‐defined FimH epitope. Differences in affinities for high‐mannose structures are at least 10‐fold larger than differences in numbers of adherent bacteria between faecal and uropathogenic strains. Our results imply that the carbohydrate expression profile of targeted host tissues and of natural inhibitors in urine, such as Tamm‐Horsfall protein, are stronger determinants of adhesion than FimH variation.

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Cited by papers we hold 2

• Intervening with Urinary Tract Infections Using Anti-Adhesives Based on the Crystal Structure of the FimH–Oligomannose-3 Complex · 2008
  Corrected
• Integrin-Mediated Host Cell Invasion by Type 1–Piliated Uropathogenic Escherichia coli · 2007
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