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Lactotetraosylceramide, a novel glycosphingolipid receptor for Helicobacter pylori, present in human gastric epithelium

In English

Författare

  • Susann Teneberg
  • Iréne Leonardsson
  • Hasse Karlsson
  • Per-Åke Jovall
  • Jonas Ångström
  • Dan Danielsson
  • Ingmar Näslund
  • Åsa Ljungh
  • Torkel Wadström
  • Karl-Anders Karlsson

Summary, in English

The binding of Helicobacter pylori to glycosphingolipids was examined by binding of 35S-labeled bacteria to glycosphingolipids on thin-layer chromatograms. In addition to previously reported binding specificities, a selective binding to a non-acid tetraglycosylceramide of human meconium was found. This H. pylori binding glycosphingolipid was isolated and, on the basis of mass spectrometry, proton NMR spectroscopy, and degradation studies, were identified as Gal3GlcNAc3Gal4Glc1Cer (lactotetraosylceramide). When using non-acid glycosphingolipid preparations from human gastric epithelial cells, an identical binding of H. pylori to the tetraglycosylceramide interval was obtained in one of seven samples. Evidence for the presence of lactotetraosylceramide in the binding-active interval was obtained by proton NMR spectroscopy of intact glycosphingolipids and by gas chromatography-electron ionization mass spectrometry of permethylated tetrasaccharides obtained by ceramide glycanase hydrolysis. The lactotetraosylceramide binding property was detected in 65 of 74 H. pylori isolates (88%). Binding of H. pylori to lactotetraosylceramide on thin-layer chromatograms was inhibited by preincubation with lactotetraose but not with lactose. Removal of the terminal galactose of lactotetraosylceramide by galactosidase hydrolysis abolished the binding as did hydrazinolysis of the acetamido group of the N-acetylglucosamine. Therefore, Gal3GlcNAc is an essential part of the binding epitope.

Publiceringsår

2002

Språk

Engelska

Sidor

19709-19719

Publikation/Tidskrift/Serie

Journal of Biological Chemistry

Volym

277

Issue

22

Dokumenttyp

Artikel i tidskrift

Förlag

American Society for Biochemistry and Molecular Biology

Ämne

  • Microbiology in the medical area

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1083-351X