title: Structural studies on N-acetylmannosaminuronic acid-containing and glucuronic acid-containing teichuronic acids in the cell wall of Bacillus megaterium AHU 1375.
abstract: Structural studies were carried out on two kinds of teichuronic acid-glycopeptide complexes (designated as TU-GP-I and TU-GP-II) isolated from lysozyme digest of N-acetylated cell walls of Bacillus megaterium AHU 1375 by ion-exchange chromatography and gel chromatography. TU-GP-I, accounting for about 25% of the cell walls, contained N-acetylmannosaminuronic acid, N-acetylglucosamine, glucose, galactose, glycerol, and phosphorus in an approximate molar ratio of 1:1:2:1:0.5:0.5, together with small amounts of glycopeptide components. TU-GP-II, accounting for about 9% of the cell walls, contained glucuronic acid, glucose, and fucose in a molar ratio of about 2:1.5:1, together with small amounts of glycopeptide components. The results of analyses involving Smith degradation, chromium oxidation, methylation, acetolysis, and H-NMR measurement led to the conclusion that the polysaccharide chain of TU-GP-I comprised repeating units,----6) Glc(alpha 1----3)-ManNAcUA(beta 1----4)[Gal(alpha 1----3)][Glc(beta 1----6)]GlcNAc(beta 1----. About half of the repeating units were substituted by glycerophosphoryl residues at C-6 of the beta-glucosyl residues linked to the N-acetylglucosamine residues. By means of a similar procedure, the polysaccharide chain of TU-GP-II was shown to comprise repeating units,----4)GlcUA(alpha 1----3)GlcUA(alpha 1----3)Glc(alpha 1----3)Fuc(alpha 1----, of which about half were substituted by alpha-glucosyl residues at C-3 of the 4-substituted glucuronosyl residues.
mesh_terms: D001410:Bacillus megaterium / Q000032:analysis*; D002240:Carbohydrate Sequence; D002473:Cell Wall / Q000032:analysis; D002850:Chromatography, Gel; D002852:Chromatography, Ion Exchange; D005965:Glucuronates / Q000032:analysis*; D020723:Glucuronic Acid; D006868:Hydrolysis; D009682:Magnetic Resonance Spectroscopy; D008745:Methylation; D008970:Molecular Weight; D014574:Uronic Acids / Q000032:analysis*
chemical_list: D005965:Glucuronates; D014574:Uronic Acids; C010788:teichuronic acid; C043028:N-acetylmannosaminuronic acid; D020723:Glucuronic Acid