title: Lipopolysaccharide of the Helicobacter pylori type strain NCTC 11637 (ATCC 43504): structure of the O antigen chain and core oligosaccharide regions.
abstract: Smooth- and rough-form lipopolysaccharides from phenol-water extraction of cells from Helicobacter pylori type strain NCTC 11637 were isolated as the water-soluble component of high-M(r) and water-insoluble low-M(r) gel. Structural investigations were performed on the intact water-soluble smooth-form lipopolysaccharide, various oligosaccharides formed as chemical and enzymic degradation products, and three oligosaccharide fractions liberated by acetic acid hydrolysis from the water-insoluble rough-form lipopolysaccharide. A structure is proposed for the complete polysaccharide component of the smooth-form lipopolysaccharide comprising the O antigen chain, an intervening region, and the inner core oligosaccharide on the basis of 1H and 13C NMR experiments, fast atom bombardment/mass spectrometry, and methylation linkage analysis of permethylated oligo- and polysaccharide derivatives. The most striking feature of the O antigen region in the lipopolysaccharide is the presence of extended chains with fucosylated and nonfucosylated N-acetyllactosamine (LacNAc) units that mimic human cell surface glycoconjugates in normal human granulocytes. The chains are terminated by di- or trimeric Lewis(x) (Le(x)) determinants, which are also found in tumor-associated carbohydrate antigens in many adenocarcinomas.
authors.affiliation: Department of Chemistry, York University, Toronto, Ontario, Canada.
authors.forename: G O
authors.initials: GO
authors.lastname: Aspinall
authors.forename: M A
authors.initials: MA
authors.lastname: Monteiro
authors.forename: H
authors.initials: H
authors.lastname: Pang
authors.forename: E J
authors.initials: EJ
authors.lastname: Walsh
authors.forename: A P
authors.initials: AP
authors.lastname: Moran
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D016480:Helicobacter pylori / Q000737:chemistry*; D006801:Humans; D008969:Molecular Sequence Data; D019081:O Antigens / Q000737:chemistry*; D009844:Oligosaccharides / Q000737:chemistry*
chemical_list: D019081:O Antigens; D009844:Oligosaccharides