title: Structural analysis of two glycosphingolipids from the lipopolysaccharide-lacking bacterium Sphingomonas capsulata.
abstract: Two glycosphingolipids, GSL-1 and GSL-3, were isolated from Sphingomonas capsulata and studied by methylation analysis, laser desorption mass spectrometry, and 1H and 13C NMR spectroscopy, including two-dimensional 1H,1H COSY and heteronuclear 13C,1H COSY experiments. GSL-1 and GSL-3 differ in their carbohydrate part, their structures being alpha-D-GlcpA-(1-->1)-Cer and alpha-D-Galp-(1-->6)-alpha-D-GlcpN-(1-->4)-alpha-D-GlcpA(1-- >1)Cer, respectively. Variations occur in the ceramide of GSL-1 and GSL-3, both having the same long-chain bases, erythro-2-amino-1, 3-octadecanediol (sphinganine), (13Z)-erythro-2-amino-13-eicosene-1, 3-diol and (13Z)-erythro-2-amino-13,14-methylene-1,3-eicosanediol, in the ratios 2.6 : 1 : 3.5 in GSL-1 and 1 : 1.2 : 1.5 in GSL-3. All bases are quantitatively substituted by amide-linked (S)-2-hydroxymyristic acid.
authors.affiliation: Department of Bacteriology, The Kitasato Institute, Tokyo, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kawahara
authors.forename: H
authors.initials: H
authors.lastname: Moll
authors.forename: Y A
authors.initials: YA
authors.lastname: Knirel
authors.forename: U
authors.initials: U
authors.lastname: Seydel
authors.forename: U
authors.initials: U
authors.lastname: Zähringer
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D002241:Carbohydrates / Q000032:analysis; D006028:Glycosphingolipids / Q000737:chemistry* / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008745:Methylation; D008969:Molecular Sequence Data; D013045:Species Specificity; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D020578:Sphingomonas / Q000737:chemistry*
chemical_list: D002241:Carbohydrates; D006028:Glycosphingolipids; C119144:glycosphingolipid GSL-1; C407208:glycosphingolipid GSL-3