title: Structural analysis of the lipopolysaccharide from Chlamydia trachomatis serotype L2.
abstract: The lipopolysaccharide (LPS) of Chlamydia trachomatis L2 was isolated from tissue culture-grown elementary bodies using a modified phenol/water procedure followed by extraction with phenol/chloroform/light petroleum. From a total of 5 x 10(4) cm2 of infected monolayers, 22.3 mg of LPS were obtained. Compositional analysis indicated the presence of 3-deoxy-D-manno-oct-2-ulopyranosonic acid (Kdo), GlcN, phosphorus, and fatty acids in a molar ratio of 2.8:2:2.1:4.5. Matrix-assisted laser-desorption ionization mass spectrometry performed on the de-O-acylated LPS gave a major molecular ion peak at m/z 1781.1 corresponding to a molecule of 3 Kdo, 2 GlcN, 2 phosphates, and two 3-hydroxyeicosanoic acid residues. The structure of deacylated LPS obtained after successive treatment with hydrazine and potassium hydroxide was determined by 600 MHz NMR spectroscopy as Kdoalpha2-->8Kdoalpha2-->4Kdoalpha2-->6D-GlcpNbeta1 -->6D-GlcpNalpha 1,4'-bisphosphate. These data, together with those published recently on the acylation pattern of chlamydial lipid A (Qureshi, N., Kaltashov, I., Walker, K., Doroshenko, V., Cotter, R. J., Takayama, K, Sievert, T. R., Rice, P. A., Lin, J.-S. L., and Golenbock, D. T. (1997) J. Biol. Chem. 272, 10594-10600) allow us to present for the first time the complete structure of a major molecular species of a chlamydial LPS.
authors.affiliation: Division of Medical and Biochemical Microbiology, Research Center Borstel, Center for Medicine and Biosciences, D-23845 Borstel, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Rund
authors.forename: B
authors.initials: B
authors.lastname: Lindner
authors.forename: H
authors.initials: H
authors.lastname: Brade
authors.forename: O
authors.initials: O
authors.lastname: Holst
mesh_terms: D002240:Carbohydrate Sequence; D002692:Chlamydia trachomatis / Q000737:chemistry* / Q000145:classification; D004537:Eicosanoic Acids / Q000032:analysis; D005944:Glucosamine / Q000032:analysis; D008070:Lipopolysaccharides / Q000737:chemistry*; D008969:Molecular Sequence Data; D019906:Nuclear Magnetic Resonance, Biomolecular; D010758:Phosphorus / Q000032:analysis; D012703:Serotyping; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013400:Sugar Acids / Q000032:analysis
chemical_list: D004537:Eicosanoic Acids; D008070:Lipopolysaccharides; D013400:Sugar Acids; C002532:2-keto-3-deoxyoctonate; D010758:Phosphorus; D005944:Glucosamine