title: Structure and Gene Cluster of the K93 Capsular Polysaccharide of Acinetobacter baumannii B11911 Containing 5-N-Acetyl-7-N-[(R)-3-hydroxybutanoyl]pseudaminic Acid.
abstract: Capsular polysaccharide (CPS) assigned to the K93 type was isolated from the bacterium Acinetobacter baumannii B11911 and studied by sugar analysis along with one- and two-dimensional1H and13C NMR spectroscopy. The CPS was found to contain a derivative of pseudaminic acid, and the structure of the branched tetrasaccharide repeating unit was established. Genes in the KL93 capsule biosynthesis locus were annotated and found to be consistent with the CPS structure established. The K93 CPS has the α-d-Galp-(1→6)-β-d-Galp-(1→3)-d-GalpNAc trisaccharide fragment in common with the K14 CPS of Acinetobacter nosocomialis LUH 5541 and A. baumannii D46. It also shares the β-d-Galp-(1→3)-d-GalpNAc disaccharide fragment and the corresponding predicted Gal transferase Gtr5, as well as the initiating GalNAc-1-P transferase ItrA2, with a number of A. baumannii strains.
authors.affiliation: Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, 119991, Russia. yknirel@gmail.com.
authors.forename: A A
authors.initials: AA
authors.lastname: Kasimova
authors.forename: M M
authors.initials: MM
authors.lastname: Shneider
authors.forename: N P
authors.initials: NP
authors.lastname: Arbatsky
authors.forename: A V
authors.initials: AV
authors.lastname: Popova
authors.forename: A S
authors.initials: AS
authors.lastname: Shashkov
authors.forename: K A
authors.initials: KA
authors.lastname: Miroshnikov
authors.forename: Veeraraghavan
authors.initials: V
authors.lastname: Balaji
authors.forename: Indranil
authors.initials: I
authors.lastname: Biswas
authors.forename: Yu A
authors.initials: YA
authors.lastname: Knirel
mesh_terms: D040981:Acinetobacter baumannii / Q000235:genetics / Q000378:metabolism*; D016667:Bacterial Capsules / Q000378:metabolism*; D002236:Carbohydrate Conformation; D066241:Carbon-13 Magnetic Resonance Spectroscopy; D005798:Genes, Bacterial; D005810:Multigene Family; D011134:Polysaccharides / Q000737:chemistry* / Q000235:genetics*; D066244:Proton Magnetic Resonance Spectroscopy; D013400:Sugar Acids / Q000032:analysis*
chemical_list: D011134:Polysaccharides; D013400:Sugar Acids