title: Structure of the O-polysaccharide and serological cross-reactivity of the lipopolysaccharide of Providencia alcalifaciens O32 containing N-acetylisomuramic acid.
abstract: The O-polysaccharide was obtained by mild acid degradation of the lipopolysaccharide of Providencia alcalifaciens O32 and studied by sugar and methylation analyses, solvolysis with triflic acid, 1H and 13C NMR spectroscopy, including two-dimensional 1H,1H COSY, TOCSY, ROESY, H-detected 1H,13C HSQC and HMBC experiments. It was found that the polysaccharide has a branched tetrasaccharide repeating unit containing 2-acetamido-3-O-[(S)-1-carboxyethyl]-2-deoxy-D-glucose (D-GlcNAc3Slac, N-acetylisomuramic acid) with the following structure: [
  SEE TEXT]. Serological studies with O-antisera showed antigenic relationships between P. alcalifaciens O32 and O29 as well as several other Providencia and Proteus strains sharing putative epitopes on the O-polysaccharides.
authors.affiliation: N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 119991 Moscow, Russian Federation.
authors.forename: Ivan S
authors.initials: IS
authors.lastname: Bushmarinov
authors.forename: Olga G
authors.initials: OG
authors.lastname: Ovchinnikova
authors.forename: Nina A
authors.initials: NA
authors.lastname: Kocharova
authors.forename: Filip V
authors.initials: FV
authors.lastname: Toukach
authors.forename: Agnieszka
authors.initials: A
authors.lastname: Torzewska
authors.forename: Alexander S
authors.initials: AS
authors.lastname: Shashkov
authors.forename: Yuriy A
authors.initials: YA
authors.lastname: Knirel
authors.forename: Antoni
authors.initials: A
authors.lastname: Rozalski
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D004591:Electrophoresis, Polyacrylamide Gel; D008070:Lipopolysaccharides / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D008969:Molecular Sequence Data; D015394:Molecular Structure; D009112:Muramic Acids / Q000737:chemistry*; D019081:O Antigens / Q000737:chemistry*; D011532:Providencia / Q000737:chemistry*
chemical_list: D008070:Lipopolysaccharides; D009112:Muramic Acids; D019081:O Antigens; C031651:N-acetylmuramic acid