title: Structural elucidation of polysaccharide part of glycoconjugate from Treponema medium ATCC 700293.
abstract: Glycoconjugates are distributed on the cell surfaces of some small-sized treponemes and have been reported to be completely different from lipopolysaccharides. We separated a glycoconjugate fraction from Treponema medium ATCC 700293, a medium-sized oral spirochete, to assess its immunobiological activities and elucidate the chemical structure of its polysaccharide part using phenol/water extraction, hydrophobic chromatography, and gel filtration. The glycoconjugate showed negligible or weak endotoxic and immunobiological properties. The chemical structure of the polysaccharide part was shown by two-dimensional NMR and MALDI-TOF-MS to be a tetrasaccharide backbone with two amino acids: [-->4)beta-d-GlcpNAc3NAcA(1-->4)beta-d-ManpNAc3NAOrn(1-->3)beta-d-GlcpNAc(1-->3)alpha-D-Fucp4NAsp(1-->] where GlcNAc3NAcA is 2,3-diacetamido-2,3-dideoxyglucuronic acid, ManNAc3NAOrn is Ndelta-(2-acetamido-3-amino-2,3-dideoxymannuronyl)ornithine, and Fuc4NAsp is 4-(alpha-aspartyl)amino-4,6-dideoxygalactose.
authors.affiliation: Department of Oral Microbiology, Asahi University School of Dentistry, Gifu, Japan; Graduate School of Science, Osaka University, Osaka, Japan.
authors.forename: Masahito
authors.initials: M
authors.lastname: Hashimoto
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Asai
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Jinno
authors.forename: Seiji
authors.initials: S
authors.lastname: Adachi
authors.forename: Shoichi
authors.initials: S
authors.lastname: Kusumoto
authors.forename: Tomohiko
authors.initials: T
authors.lastname: Ogawa
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D002462:Cell Membrane / Q000737:chemistry; D006001:Glycoconjugates / Q000737:chemistry* / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D009844:Oligosaccharides / Q000737:chemistry*; D011135:Polysaccharides, Bacterial / Q000737:chemistry* / Q000302:isolation & purification; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D014208:Treponema / Q000737:chemistry* / Q000254:growth & development
chemical_list: D006001:Glycoconjugates; D009844:Oligosaccharides; D011135:Polysaccharides, Bacterial