title: Structure of an acidic O-specific polysaccharide of the marine bacterium Pseudoalteromonas sp. KMM 634.
abstract: An acidic O-specific polysaccharide containing D-glucuronic acid (D-GlcA), 2,3-diacetamido-2,3-dideoxy-D-glucuronic acid (D-GlcNAc3NAcA), 2,3-diacetamido-2,3-dideoxy-D-mannuronoyl-L-alanine (D-ManNAc3NAcA6Ala), and 2-acetamido-2,4, 6-trideoxy-4-[(S)-3-hydroxybutyramido]-D-glucose (D-QuiNAc4NAcyl) was obtained by mild acid degradation of the lipopolysaccharide of the bacterium Pseudoalteromonas sp. KMM 634 followed by gel-permeation chromatography. The polysaccharide was cleaved selectively with a new solvolytic agent, trifluoromethanesulfonic acid, to give a disaccharide and a trisaccharide with D-GlcNAc3NAcA at the reducing end. The borohydride-reduced oligosaccharides and the initial polysaccharide were studied by GLC-MS and 1H- and 13C-NMR spectroscopy, and the following structure of the linear tetrasaccharide repeating unit of the polysaccharide was established: -->3)-alpha-D-QuipNAc4Ac4NAcyl-(1-->4)-beta-D-ManpNAc3NAcA6Ala+ ++-(1-->4)-b eta-D-GlcpNAc3NAc3NAcA-(1-->4)-beta-D-GlcpA-(1-->.
authors.affiliation: Pacific Institute of Bioorganic Chemistry, Far East Branch of the Russian Academy of Sciences, Vladivostok, 690022, Russia.
authors.forename: N A
authors.initials: NA
authors.lastname: Komandrova
authors.forename: S V
authors.initials: SV
authors.lastname: Tomshich
authors.forename: L S
authors.initials: LS
authors.lastname: Shevchenko
authors.forename: A V
authors.initials: AV
authors.lastname: Perepelov
authors.forename: S N
authors.initials: SN
authors.lastname: Senchenkova
authors.forename: A S
authors.initials: AS
authors.lastname: Shashkov
authors.forename: Y A
authors.initials: YA
authors.lastname: Knirel
mesh_terms: D002240:Carbohydrate Sequence; D002849:Chromatography, Gas; D006603:Hexuronic Acids / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008969:Molecular Sequence Data; D019081:O Antigens / Q000737:chemistry* / Q000302:isolation & purification; D011134:Polysaccharides / Q000737:chemistry*; D020560:Proteobacteria / Q000737:chemistry* / Q000276:immunology*
chemical_list: D006603:Hexuronic Acids; D019081:O Antigens; D011134:Polysaccharides