title: Primary structure of the heterosaccharide of the surface glycoprotein of Methanothermus fervidus.
abstract: The outer surface of the cells of the hyperthermophile Methanothermus fervidus is covered by crystalline glycoprotein subunits (S-layer). From the purified S-layer glycoprotein, a heterosaccharide was isolated. The heterosaccharide consists of D-3-O-methylmannose, D-mannose, and D-N-acetylgalactosamine in a molar ratio of 2:3:1 corresponding to a relative molecular mass of 1061.83 Da. 3-O-methylmannose could be partly replaced by 3-O-methylglucose. The primary structure of the glycan was revealed by methylation analysis, by plasma desorption mass spectrometry, and by high field NMR spectroscopy. The purified heterosaccharide is linked via N-acetylgalactosamine to an asparagine residue of the peptide moiety. The following structure is proposed for the heterosaccharide: alpha-D-3-O-MetManp-(1-->6)-alpha-D-3-O-MetManp-((1-->2)-alp ha-D-Manp)3-(1-->4) - D-GalNAc.
authors.affiliation: Abteilung Angewandte Mikrobiologie und Mykologie, Universität Ulm, Germany.
authors.forename: U
authors.initials: U
authors.lastname: Kärcher
authors.forename: H
authors.initials: H
authors.lastname: Schröder
authors.forename: E
authors.initials: E
authors.lastname: Haslinger
authors.forename: G
authors.initials: G
authors.lastname: Allmaier
authors.forename: R
authors.initials: R
authors.lastname: Schreiner
authors.forename: F
authors.initials: F
authors.lastname: Wieland
authors.forename: A
authors.initials: A
authors.lastname: Haselbeck
authors.forename: H
authors.initials: H
authors.lastname: König
mesh_terms: D002240:Carbohydrate Sequence; D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D002855:Chromatography, Thin Layer; D009682:Magnetic Resonance Spectroscopy; D017012:Methanobacteriales / Q000737:chemistry*; D008969:Molecular Sequence Data; D009844:Oligosaccharides / Q000737:chemistry* / Q000302:isolation & purification; D011134:Polysaccharides / Q000032:analysis
chemical_list: D009844:Oligosaccharides; D011134:Polysaccharides