title: Structural characterization of the acid-degraded secondary cell wall polymer of Geobacillus stearothermophilus PV72/p2.
abstract: The secondary cell wall polymer (SCWP) from Geobacillus stearothermophilus PV72/p2, which is involved in the anchoring of the surface-layer protein to the bacterial cell wall layer, is composed of 2-amino-2-deoxy- and 2-acetamido-2-deoxy-D-glucose, 2-acetamido-2-deoxy-D-mannose, and 2-acetamido-2-deoxy-D-mannuronic acid. The primary structure of the acid-degraded polysaccharide--liberated by HF-treatment from the cell wall--was determined by high-field NMR spectroscopy and mass spectrometry using N-acetylated and hydrolyzed polysaccharide derivatives as well as Smith-degradation. The polysaccharide was shown to consist of a tetrasaccharide repeating unit containing a pyruvic acid acetal at a side-chain 2-acetamido-2-deoxy-alpha-D-mannopyranosyl residue. Substoichiometric substitutions of the repeating unit were observed concerning the degree of N-acetylation of glucosamine residues and the presence of side-chain linked 2-acetamido-2-deoxy-beta-D-glucopyranosyl units: [Formula: see text].
authors.affiliation: Department of Chemistry, Carlsberg Laboratory, Valby, Denmark.
authors.forename: Bent O
authors.initials: BO
authors.lastname: Petersen
authors.forename: Margit
authors.initials: M
authors.lastname: Sára
authors.forename: Christoph
authors.initials: C
authors.lastname: Mader
authors.forename: Harald F
authors.initials: HF
authors.lastname: Mayer
authors.forename: Uwe B
authors.initials: UB
authors.lastname: Sleytr
authors.forename: Martin
authors.initials: M
authors.lastname: Pabst
authors.forename: Michael
authors.initials: M
authors.lastname: Puchberger
authors.forename: Eberhard
authors.initials: E
authors.lastname: Krause
authors.forename: Andreas
authors.initials: A
authors.lastname: Hofinger
authors.forename: Jens Ø
authors.initials: JØ
authors.lastname: Duus
authors.forename: Paul
authors.initials: P
authors.lastname: Kosma
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D002473:Cell Wall / Q000737:chemistry* / Q000378:metabolism; D001411:Geobacillus stearothermophilus / Q000737:chemistry* / Q000378:metabolism; D006858:Hydrofluoric Acid; D006868:Hydrolysis; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D011135:Polysaccharides, Bacterial / Q000737:chemistry* / Q000378:metabolism; D021241:Spectrometry, Mass, Electrospray Ionization; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D011135:Polysaccharides, Bacterial; D006858:Hydrofluoric Acid