title: Structural investigation on the lipooligosaccharide fraction of psychrophilic Pseudoalteromonas haloplanktis TAC 125 bacterium.
abstract: The core structure of the cell-wall lipooligosaccharide (LOS) fraction of an Antarctic Gram-negative bacterium, Pseudoalteromonas haloplanktis TAC 125 strain, was determined to be deacetylated alditols. These were obtained from native LOS fraction by O-deacylation, dephosphorylation, reduction and finally N-deacylation. Two novel structures were detected, the more highly represented molecule consisting of the following hexasaccharide chain: alpha-D-ManpNH(2)-(1-->3)-beta-D-Galp-(1-->4)-alpha-L-glycero-D-manno-Hepp-(1-->5)-alpha-D-Kdo-(2-->6)-beta-D-GlcpNH(2)-(1-->6)-D-GlcNH(2)(ol) while the corresponding pentasaccharide, lacking the ManpNH(2) residue, was less abundant. To the best of our knowledge, the structural investigation presented here, mainly performed by NMR and MS methods, is the first report of the lipopolysaccharide fraction of a psychrophilic bacterium.
authors.affiliation: Dipartimento di Chimica Organica e Biochimica, Università di Napoli Federico II, Complesso Universitario di Monte S. Angelo, via Cynthia, 4 80126 Naples, Italy. corsaro@unina.it
authors.forename: M M
authors.initials: MM
authors.lastname: Corsaro
authors.forename: R
authors.initials: R
authors.lastname: Lanzetta
authors.forename: E
authors.initials: E
authors.lastname: Parrilli
authors.forename: M
authors.initials: M
authors.lastname: Parrilli
authors.forename: M L
authors.initials: ML
authors.lastname: Tutino
mesh_terms: D020591:Alteromonas / Q000737:chemistry*; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D002851:Chromatography, High Pressure Liquid; D002852:Chromatography, Ion Exchange; D008401:Gas Chromatography-Mass Spectrometry; D008070:Lipopolysaccharides / Q000737:chemistry* / Q000302:isolation & purification; D008745:Methylation; D008969:Molecular Sequence Data; D019906:Nuclear Magnetic Resonance, Biomolecular; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D008070:Lipopolysaccharides; C023023:lipid-linked oligosaccharides