title: Structure of the O polysaccharide and immunochemical relationships between the lipopolysaccharides of Pseudomonas syringae pathovar tomato and pathovar maculicola.
abstract: O polysaccharides (OPS) of the lipopolysaccharides (LPS) of Pseudomonas syringae pathovar tomato GSPB 483 and pathovar maculicola IMV 381 were studied by 1H-NMR and 13C-NMR spectroscopy, including two-dimensional COSY, rotating-frame NOE spectroscopy (ROESY), and H-detected 1H,13C heteronuclear multiple-quantum coherence (HMQC) experiments. The OPS from both strains were shown to be chemically identical. Two structurally different types of repeating units (O repeats 1 and 2) were elucidated in each OPS. The minor O repeat is a pentasaccharide having the structure 2. The same structure has been reported earlier for some other OPS of P. syringae. The major O repeat is a hexasaccharide with the novel structure 1 which is distinguished from 2 by the presence of the second lateral residue of 3-acetamido-3,6-dideoxy-D-galactose (D-Fuc3NAc) and by a different position of substitution of one of the L-rhamnose (Rha) residues in the backbone. [structures: see text] Structural and serological diversity of OPS of strains belonging to P. syringae pv. tomato and pv. maculicola and phylogenetic relatedness of the strains are discussed.
authors.affiliation: N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation. knirel@ioc.ac.ru
authors.forename: Y A
authors.initials: YA
authors.lastname: Knirel
authors.forename: V V
authors.initials: VV
authors.lastname: Ovod
authors.forename: G M
authors.initials: GM
authors.lastname: Zdorovenko
authors.forename: R I
authors.initials: RI
authors.lastname: Gvozdyak
authors.forename: K J
authors.initials: KJ
authors.lastname: Krohn
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D008070:Lipopolysaccharides / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D019081:O Antigens / Q000737:chemistry* / Q000276:immunology; D009844:Oligosaccharides / Q000737:chemistry; D011135:Polysaccharides, Bacterial / Q000737:chemistry; D011549:Pseudomonas / Q000276:immunology* / Q000472:pathogenicity; D012699:Serology
chemical_list: D008070:Lipopolysaccharides; D019081:O Antigens; C095976:O antigen, Pseudomonas; D009844:Oligosaccharides; D011135:Polysaccharides, Bacterial