title: Structural analysis of the heptose/hexose region of the lipopolysaccharide from Escherichia coli K-12 strain W3100.
abstract: The disaccharide L-glycero-D-manno-heptosyl-D-glucose was isolated from the lipopolysaccharide (LPS) of Escherichia coli K-12 strain W3100 after partial hydrolysis with acid, and the structure was determined by methylation analysis, n.m.r. spectroscopy, and comparison with a synthetic standard. In addition, the oligosaccharides L,D-Hep-D-Glc-D-Glc and L,D-Hep-D-Glc-D-Glc-D-Glc were isolated, and their structures were established by g.l.c.-m.s. and methylation analysis. The results indicated that L-glycero-D-manno-heptose, a characteristic constituent of the inner core region, may also occur in the outer core region which, in E. coli, is generally composed of hexoses. A revised structure of the carbohydrate backbone of the hexose/heptose region of the LPS is given.
authors.affiliation: Forschungsinstitut Borstel, Institut für Experimentalle Biologie und Medizin, F.R.G.
authors.forename: O
authors.initials: O
authors.lastname: Holst
authors.forename: U
authors.initials: U
authors.lastname: Zähringer
authors.forename: H
authors.initials: H
authors.lastname: Brade
authors.forename: A
authors.initials: A
authors.lastname: Zamojski
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D004926:Escherichia coli / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D006539:Heptoses / Q000032:analysis; D006601:Hexoses / Q000032:analysis; D008070:Lipopolysaccharides / Q000737:chemistry* / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008969:Molecular Sequence Data; D009844:Oligosaccharides / Q000302:isolation & purification
chemical_list: D006539:Heptoses; D006601:Hexoses; D008070:Lipopolysaccharides; D009844:Oligosaccharides