Identification of cell-surface mannans in a virulent Helicobacter pylori strain

Carbohydr Res. 2010 Apr 19;345(6):830-8. doi: 10.1016/j.carres.2010.01.022. Epub 2010 Feb 16.


With the intent of contributing to a carbohydrate-based vaccine against the gastroduodenal pathogen, Helicobacter pylori, we report here the structure of cell-surface mannans obtained from a virulent strain. Unlike other wild-type strains, this strain was found to express in good quantities this polysaccharide in vitro. Structural analysis revealed a branched mannan formed by a backbone of alpha-(1-->6)-linked mannopyranosyl residues with approximately 80% branching at the O-2 position. The branches were composed of O-2-linked Man residues in both alpha- and beta-configurations: [abstract: see text]. In addition, this strain also expressed cell-surface emblematic H. pylori lipopolysaccharides (LPS) containing partially fucosylated polyLacNAc O-chains. Affinity assays with polymyxin-B and concanavalin A revealed no association between the mannan and the LPS. The described mannans may be implicated in the mediation of host-microbial interactions and immunological modulation.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Carbohydrate Sequence
  • Chromatography, Affinity
  • Concanavalin A / chemistry
  • Helicobacter pylori / chemistry*
  • Lipopolysaccharides / chemistry*
  • Magnetic Resonance Spectroscopy
  • Mannans / chemistry*
  • Molecular Sequence Data
  • Polymyxin B / chemistry
  • Virulence


  • Lipopolysaccharides
  • Mannans
  • Concanavalin A
  • Polymyxin B