title: [Structure of the heptose region of the lipopolysaccharide from Escherichia coli K12 CR34 (author's transl)].
abstract: The heptose region of the lipopolysaccharide of Escherichia coli K12 CR34 was studied. The glucose linked to the heptose II was found to be substituted by a D-galactose and the linear chain of the core polysaccharide has two (1 lead to 3) linked heptoses. The heptose II is substituted by a lateral (1 leads to 7) linked heptose III and heptose I is linked in (1 leads to 5) to 2-deoxy-D-manno-octulosonic acid. The three sugars of the linear chain, heptose I, heptose II and glucose are substituted by phosphate, pyrophosphate or pyrophosphorylethanolamine group linked to C-4 hydroxyl groups. However, in some polysaccharidic chains one or two substituting groups may be absent. This result may explain the heterogeneity in the length of the core polysaccharidic chains.
mesh_terms: D002236:Carbohydrate Conformation; D055598:Chemical Phenomena; D002621:Chemistry; D004926:Escherichia coli / Q000032:analysis*; D005690:Galactose; D006539:Heptoses; D007661:Ketoses; D008070:Lipopolysaccharides; D013058:Mass Spectrometry; D010710:Phosphates; D013400:Sugar Acids
chemical_list: D006539:Heptoses; D007661:Ketoses; D008070:Lipopolysaccharides; D010710:Phosphates; D013400:Sugar Acids; C002532:2-keto-3-deoxyoctonate; D005690:Galactose
vernacular_title: Structure de la région heptose du lipopolysaccharide de Escherichia coli K12 CR34.