title: Structural studies of the capsular polysaccharide from Streptococcus pneumoniae type 18A.
abstract: The structure of the capsular polysaccharide (S18A) elaborated by Streptococcus pneumoniae type 18A has been investigated by using methylation analysis and n.m.r. spectroscopy. It is concluded that the polysaccharide is composed of pentasaccharide repeating-units having the following structure. (formula; see text) In this structure, the absolute configuration of the glycerol 1-phosphate moiety has not been determined but is assumed to be D from biosynthesis considerations. The structure of S18A is, as expected, closely similar to those determined for S18F and S18C.
authors: Department of Organic Chemistry, University of Stockholm, Sweden.
authors: P E
authors: PE
authors: Jansson
authors: N S
authors: NS
authors: Kumar
authors: B
authors: B
authors: Lindberg
authors: G
authors: G
authors: Widmalm
authors: J
authors: J
authors: Henrichsen
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D009682:Magnetic Resonance Spectroscopy; D008745:Methylation; D008969:Molecular Sequence Data; D009844:Oligosaccharides / Q000302:isolation & purification; D011135:Polysaccharides, Bacterial / Q000302:isolation & purification; D013296:Streptococcus pneumoniae / Q000276:immunology*
chemical_list: D009844:Oligosaccharides; D011135:Polysaccharides, Bacterial