title: The structure of the capsular polysaccharide from Streptococcus pneumoniae type 7B.
abstract: The capsular polysaccharide elaborated by Streptococcus pneumoniae type 7B is composed of the following heptasaccharide repeating-units. [formula: see text] The identities and modes of linkage of the constituents were established using sugar, methylation, and phosphorus analysis, together with 1D- and 2D-n.m.r. spectroscopy. The sequence was established from inter-residue n.O.e. data. The structure was corroborated by n.m.r. spectroscopy, f.a.b.-m.s., and methylation analysis of the oligosaccharides isolated after partial acid hydrolysis of the polysaccharide with aqueous 48% hydrogen fluoride. It is suggested that the structural basis for the common antigenic formula in the group 7 serotypes of S. pneumoniae is the disaccharide element alpha-D-GlcpNAc-(1----2)-alpha-L-Rhap-(1----.
authors.affiliation: Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, Sweden.
authors.forename: P E
authors.initials: PE
authors.lastname: Jansson
authors.forename: J
authors.initials: J
authors.lastname: Lindberg
authors.forename: K M
authors.initials: KM
authors.lastname: Wimalasiri
authors.forename: J
authors.initials: J
authors.lastname: Henrichsen
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D015394:Molecular Structure; D011135:Polysaccharides, Bacterial / Q000737:chemistry*; D012703:Serotyping; D013296:Streptococcus pneumoniae / Q000737:chemistry* / Q000145:classification
chemical_list: D011135:Polysaccharides, Bacterial