title: Structure of a galactan from cell walls of Bifidobacterium catenulatum YIT4016.
abstract: A structural study was carried out on a galactose-rich polysaccharide fraction isolated from cell walls of Bifidobacterium catenulatum YIT4016 after N-acetylmuramidase digestion. The polysaccharide contained galactose and glucosamine in a molar ratio of 16.9:1.0. Data obtained by 13C NMR spectroscopy showed that the backbone chain of this polysaccharide is composed of galactofuranose residues, while the branches consist of galactopyranosyl residues. Furthermore, the data obtained from NaIO4 oxidation, partial methanolysis and methylation analysis indicated that this polysaccharide consists of a trisaccharide repeating unit having the following structure: [sequence: see text]
authors.affiliation: Yakult Central Institute for Microbiological Research, Tokyo, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Nagaoka
authors.forename: S
authors.initials: S
authors.lastname: Hashimoto
authors.forename: H
authors.initials: H
authors.lastname: Shibata
authors.forename: I
authors.initials: I
authors.lastname: Kimura
authors.forename: K
authors.initials: K
authors.lastname: Kimura
authors.forename: H
authors.initials: H
authors.lastname: Sawada
authors.forename: T
authors.initials: T
authors.lastname: Yokokura
mesh_terms: D001644:Bifidobacterium / Q000737:chemistry* / Q000648:ultrastructure; D002240:Carbohydrate Sequence; D002473:Cell Wall / Q000737:chemistry; D005685:Galactans / Q000737:chemistry*; D006026:Glycoside Hydrolases; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D015394:Molecular Structure; D011134:Polysaccharides / Q000737:chemistry*
chemical_list: D005685:Galactans; D011134:Polysaccharides; D006026:Glycoside Hydrolases; C026255:endo-N-acetylmuramidase