title: Structure of the O polysaccharides and serological classification of Pseudomonas syringae pv. porri from genomospecies 4.
abstract: Strains of Pseudomonas syringae pv. porri are characterized by a number of pathovar-specific phenotypic and genomic characters and constitute a highly homogeneous group. Using monoclonal antibodies, they all were classified in a novel P. syringae serogroup O9. The O polysaccharides (OPS) isolated from the lipopolysaccharides (LPS) of P. syringae pv. porri NCPPB 3365 and NCPPB 3364T possess multiple oligosaccharide O repeats, some of which are linear and composed of l-rhamnose (l-Rha), whereas the major O repeats are branched with l-rhamnose in the main chain and GlcNAc in side chains (structures 1 and 2). Both branched O repeats, which differ in the position of substitution of one of the Rha residues and in the site of attachment of GlcNAc, were found in the two strains studied, O repeat 1 being major in strain NCPPB 3365 and 2 in strain NCPPB 3364T. [formula: see text]. The relationship between OPS chemotype and serotype on one hand and the genomic characters of P. syringae pv. porri and other pathovars delineated in genomospecies 4 on the other hand is discussed.
authors.affiliation: N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia.
authors.forename: Evelina L
authors.initials: EL
authors.lastname: Zdorovenko
authors.forename: George V
authors.initials: GV
authors.lastname: Zatonskii
authors.forename: Nina A
authors.initials: NA
authors.lastname: Kocharova
authors.forename: Aleksander S
authors.initials: AS
authors.lastname: Shashkov
authors.forename: Yuriy A
authors.initials: YA
authors.lastname: Knirel
authors.forename: Vladimir V
authors.initials: VV
authors.lastname: Ovod
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D016680:Genome, Bacterial; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D019081:O Antigens / Q000737:chemistry*; D011549:Pseudomonas / Q000737:chemistry* / Q000145:classification* / Q000235:genetics; D012210:Rhamnose / Q000737:chemistry; D012703:Serotyping / Q000379:methods
chemical_list: D019081:O Antigens; D012210:Rhamnose