Helicobacter pylori lipopolysaccharide structural domains and their recognition by immune proteins revealed with carbohydrate microarrays

Lisete M. Silva, Viviana G. Correia, Ana S. P. Moreira, Maria Rosário M. Domingues, Rui Manuel Ferreira, Céu Figueiredo, Nuno F. Azevedo, Ricardo Marcos-Pinto, Fátima Carneiro, Ana Magalhães, Celso A. Reis, Ten Feizi, José A. Ferreira, Manuel A. Coimbra, Angelina S. Palma

Research output: Contribution to journalArticlepeer-review

Abstract

The structural diversity of the lipopolysaccharides (LPSs) from Helicobacter pylori poses a challenge to establish accurate and strain-specific structure-function relationships in interactions with the host. Here, LPS structural domains from five clinical isolates were obtained and compared with the reference strain 26695. This was achieved combining information from structural analysis (GC-MS and ESI-MSn) with binding data after interrogation of a LPS-derived carbohydrate microarray with sequence-specific proteins. All LPSs expressed Lewisx/y and N-acetyllactosamine determinants. Ribans were also detected in LPSs from all clinical isolates, allowing their distinction from the 26695 LPS. There was evidence for 1,3-D-galactans and blood group H-type 2 sequences in two of the clinical isolates, the latter not yet described for H. pylori LPS. Furthermore, carbohydrate microarray analyses showed a strain-associated LPS recognition by the immune lectins DC-SIGN and galectin-3 and revealed distinctive LPS binding patterns by IgG antibodies in the serum from H. pylori-infected patients.

Original languageEnglish
Article number117350
JournalCarbohydrate Polymers
Volume253
DOIs
Publication statusPublished - 1 Feb 2021

Keywords

  • Carbohydrate microarrays
  • Helicobacter pylori
  • Host immune receptors
  • Human sera
  • Lipopolysaccharides
  • Mass spectrometry

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