title: New structure for the O-polysaccharide of Providencia alcalifaciens O27 and revised structure for the O-polysaccharide of Providencia stuartii O43.
abstract: The O-polysaccharide was obtained by mild acid degradation of the lipopolysaccharide from Providencia alcalifaciens O27 and studied by sugar and methylation analyses along with (1)H and (13)C NMR spectroscopy, including 2D (1)H,(1)H COSY, TOCSY, ROESY, H-detected (1)H,(13)C HSQC, and HMBC experiments. It was found that the polysaccharide is built up of linear partially O-acetylated tetrasaccharide repeating units and has the following structure: [structure: see text] where Qui4NFo stands for 4-formamido-4,6-dideoxyglucose (4-formamido-4-deoxyquinovose). The O-polysaccharide structure of Providencia stuartii O43 established earlier was revised with respect to the configuration of the constituent 4-amino-4,6-dideoxyhexose (from Rha4N to Qui4N).
authors: N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 119991 Moscow, Russian Federation. olga.ovchinnikova@gmail.com
authors: Olga G
authors: OG
authors: Ovchinnikova
authors: Ivan S
authors: IS
authors: Bushmarinov
authors: Nina A
authors: NA
authors: Kocharova
authors: Filip V
authors: FV
authors: Toukach
authors: Marianna
authors: M
authors: Wykrota
authors: Alexander S
authors: AS
authors: Shashkov
authors: Yuriy A
authors: YA
authors: Knirel
authors: Antoni
authors: A
authors: Rozalski
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D009682:Magnetic Resonance Spectroscopy; D008745:Methylation; D008969:Molecular Sequence Data; D009005:Monosaccharides / Q000032:analysis; D011135:Polysaccharides, Bacterial / Q000737:chemistry*; D011532:Providencia / Q000737:chemistry*
chemical_list: D009005:Monosaccharides; D011135:Polysaccharides, Bacterial