title: Isolation and chemical analysis of a lipopolysaccharide from the outer membrane of the oral anaerobic spirochete Treponema pectinovorum.
abstract: Isolation of a putative lipopolysaccharide from the surface of the oral treponeme, Treponema pectinovorum, revealed it to contain larger amounts of 3-deoxy-D-manno-octulosonic acid compared with other oral Treponema species. This molecule was isolated from the outer membrane of T. pectinovorum and had chemical characteristics of a putative lipopolysaccharide. The yield of lipopolysaccharide was between 0.6% and to 1.1% of the bacterial dry weight. The purified molecule was resistant to the action of proteinases and consisted of both sugars and lipids. 3-Deoxy-D-manno-octulosonic acid and hexoses accounted for 6.1-8.7% and 17.6-20.2%, respectively of the dry weight. Carbohydrate compositional analysis revealed the presence of glucose, galactose, 2-acetamido-2-deoxy-glucose, rhamnose and 6-deoxy-talose in the molar ratio of 1.00:0.96:0.19:0.88:0.98, respectively. No heptose was detected. The fatty acid analysis determined the presence of straight chain, C13:00, C14:00, C15:00 and C17:00 acids, as well as branched chain, C13:00, C14:00 and two species of C15:00, acids. Electrophoretic analysis indicated that the lipopolysaccharide was present as two major species.
authors.affiliation: Department of Microbiology, University of Texas Health Science Center at San Antonio 78284-7758, USA.
authors.forename: S G
authors.initials: SG
authors.lastname: Walker
authors.forename: X
authors.initials: X
authors.lastname: Xu
authors.forename: E
authors.initials: E
authors.lastname: Altman
authors.forename: K J
authors.initials: KJ
authors.lastname: Davis
authors.forename: J L
authors.initials: JL
authors.lastname: Ebersole
authors.forename: S C
authors.initials: SC
authors.lastname: Holt
mesh_terms: D002462:Cell Membrane / Q000737:chemistry; D004591:Electrophoresis, Polyacrylamide Gel; D005227:Fatty Acids / Q000032:analysis; D006601:Hexoses / Q000032:analysis; D008070:Lipopolysaccharides / Q000737:chemistry* / Q000302:isolation & purification; D013400:Sugar Acids / Q000032:analysis; D014208:Treponema / Q000737:chemistry*
chemical_list: D005227:Fatty Acids; D006601:Hexoses; D008070:Lipopolysaccharides; D013400:Sugar Acids; C002532:2-keto-3-deoxyoctonate