title: Structural characterization of the antigenic O-chain of the lipopolysaccharide of Escherichia coli serotype O65.
abstract: The antigenic O-polysaccharide moiety of the lipopolysaccharide produced by Escherichia coli serotype O65 was investigated by composition, methylation, base hydrolysis, periodate oxidation, mass spectrometric methods, and by 1D and 2D NMR spectroscopy. The O-polysaccharide had [alpha]D + 108 degrees (water) and is a high-molecular-weight unbranched linear polymer of repeating pentasaccharide units composed of 1:1:1:1:1 D-galacturonic acid (D-GalA), D-galacturonamide (D-GalANH2), 2-acetamido-2-deoxy-D-glucose (D-GlcNAc), 2-acetamido-2-deoxy-D-galactose (D-GalNAc), and 3-acetamido-3,6-dideoxy-D-glucose (D-Qui3NAc), and has the following structure: [formula: see text]
authors.affiliation: Institute for Biological Sciences, National Research Council, Ottawa, Ont., Canada. malcolm.perry@nrc.ca
authors.forename: M B
authors.initials: MB
authors.lastname: Perry
authors.forename: L L
authors.initials: LL
authors.lastname: MacLean
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D004926:Escherichia coli / Q000276:immunology*; D008070:Lipopolysaccharides / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008969:Molecular Sequence Data; D009005:Monosaccharides / Q000032:analysis; D019081:O Antigens / Q000737:chemistry*; D017421:Sequence Analysis; D012703:Serotyping
chemical_list: D008070:Lipopolysaccharides; D009005:Monosaccharides; D019081:O Antigens