title: Molecular and chemical analysis of the lipopolysaccharide from Aeromonas hydrophila strain AH-1 (Serotype O11).
abstract: A group of virulent Aeromonas hydrophila, A. sobria, and A. veronii biovar sobria strains isolated from humans and fish have been described; these strains classified to serotype O11 are serologically related by their lipopolysaccharide (LPS) O-antigen (O-polysaccharide), and the presence of an S-layer consisting of multiple copies of a crystalline surface array protein with a molecular weight of 52 kDa in the form of a crystalline surface array which lies peripheral to the cell wall. A. hydrophila strain AH-1 is one of them. We isolated the LPS from this strain and determined the structure of the O-polysaccharide, which was similar to that previously described for another strain of serotype O11. The genetics of the O11-antigen showed the genes (wbO11 cluster) in two sections separated by genes involved in biosynthesis and assembly of the S-layer. The O11-antigen LPS is an example of an ABC-2-transporter-dependent pathway for O-antigen heteropolysaccharide (disaccharide) assembly. The genes involved in the biosynthesis of the LPS core (waaO11 cluster) were also identified in three different chromosome regions being nearly identical to the ones described for A. hydrophila AH-3 (serotype O34). The genetic data and preliminary chemical analysis indicated that the LPS core for strain AH-1 is identical to the one for strain AH-3.
authors: Department of Microbiology, Faculty of Biology, University of Barcelona, Diagonal 643, 08071 Barcelona, Spain. smerino@ub.edu.
authors: Susana
authors: S
authors: Merino
authors: Institute of Integrative Biology, University of Liverpool, Crown Street, L69 7ZB Liverpool, UK. rcanals@gmail.com.
authors: Rocío
authors: R
authors: Canals
authors: Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow V-334, Russia. yknirel@gmail.com.
authors: Yuriy A
authors: YA
authors: Knirel
authors: Department of Microbiology, Faculty of Biology, University of Barcelona, Diagonal 643, 08071 Barcelona, Spain. smerino@ub.edu.
authors: Juan M
authors: JM
authors: Tomás
mesh_terms: D018528:ATP-Binding Cassette Transporters / Q000235:genetics / Q000378:metabolism; D000107:Acetylation; D016980:Aeromonas hydrophila / Q000737:chemistry* / Q000201:enzymology / Q000378:metabolism; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism; D002240:Carbohydrate Sequence; D002876:Chromosomes, Bacterial; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D008070:Lipopolysaccharides / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism / Q000494:pharmacology; D008970:Molecular Weight; D005810:Multigene Family; D009154:Mutation; D019081:O Antigens / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism / Q000494:pharmacology; D011994:Recombinant Proteins / Q000378:metabolism; D013045:Species Specificity
chemical_list: D018528:ATP-Binding Cassette Transporters; D001426:Bacterial Proteins; D008070:Lipopolysaccharides; D019081:O Antigens; D011994:Recombinant Proteins