title: Structure of the N-acetyl-L-rhamnosamine-containing O-polysaccharide of Proteus vulgaris TG 155 from a new Proteus serogroup, O55.
abstract: The O-polysaccharide of the lipopolysaccharide (LPS) of Proteus vulgaris TG 155 was found to contain 2-acetamido-2,6-dideoxy-L-mannose (N-acetyl-L-rhamnosamine, L-RhaNAc), a monosaccharide that occurs rarely in Nature. The following structure of the O-polysaccharide was established by NMR spectroscopy, including 2D COSY, TOCSY, ROESY and 1H,13C HSQC experiments, along with chemical methods: [carbohydrate structure in text] Rabbit polyclonal O-antiserum against P. vulgaris TG 155 reacted with both core and O-polysaccharide moieties of the homologous LPS but showed no cross-reactivity with other LPS from the complete set of serologically different Proteus strains. Based on the unique O-polysaccharide structure and the serological data, we propose classifying P. vulgaris TG 155 into a new, separate Proteus O-serogroup, O55.
mesh_terms: D000606:Amino Sugars / Q000737:chemistry*; D000818:Animals; D002240:Carbohydrate Sequence; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D011135:Polysaccharides, Bacterial / Q000737:chemistry* / Q000302:isolation & purification*; D011514:Proteus vulgaris / Q000737:chemistry*; D011817:Rabbits; D012210:Rhamnose / Q000031:analogs & derivatives*
chemical_list: D000606:Amino Sugars; D011135:Polysaccharides, Bacterial; D012210:Rhamnose