title: Structure of the heptose region of lipopolysaccharies from Rhodospirillum tenue.
abstract: There is a common structure (core region) in the lipopolysaccharides of Rhodospirillum tenue. It is composed of a branched trisaccharide of L-glycero-D-mannoheptose (and of 2-keto-3-deoxyoctonate), as revealed by methylation analyses of degraded polysaccharides of four different R. tenue strains. The structure is similar or might even be identical to the inner core of enterobacterial O antigens. In addition, each of the four R. tenue lipopolysaccharides contains a strain-specific region that consists of heptose(s) (L-glycero-D-mannoheptose or D-glycero-D-mannoheptose or both) or hexoses. There is a partial substitution of the core region and the strain-specific region by phosphorus, showing microheterogeneity.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D006539:Heptoses / Q000032:analysis*; D006601:Hexoses / Q000032:analysis; D008070:Lipopolysaccharides / Q000032:analysis*; D010710:Phosphates / Q000032:analysis; D012246:Rhodospirillum / Q000032:analysis*; D013045:Species Specificity
chemical_list: D006539:Heptoses; D006601:Hexoses; D008070:Lipopolysaccharides; D010710:Phosphates