title: Characterization of monoclonal antibodies against Actinobacillus pleuropneumoniae serotype 5.
abstract: Two monoclonal antibodies against Actinobacillus pleuropneumoniae serotype 5, designated as 5MAb-1 and 5MAb-6, were characterized. Enzyme-linked immunosorbent assay-inhibition tests with whole-cell antigens obtained from strains of serotype 1 through 12 of A pleuropneumoniae revealed that 5 MAb-1 bound to only serotype-5 strains. The epitope recognized by 5MAb-1 was a carbohydrate that was sensitive to periodate oxidation and resided on the structure of beta-1,6-linked D-galactose in an O-antigen polysaccharide of serotype-5 lipopolysaccharide. Analysis of these results revealed that the O-antigen polysaccharide of lipopolysaccharide was 1 of the antigenic determinants responsible for the serotype specificity of A pleuropneumoniae. On the other hand, 5MAb-6 reacted with strains of serotype 1 through 10 in varying degrees and its epitope was located on polypeptides sensitive to proteinase K. In an immunoblotting analysis, 5MAb-6 reacted with 2 polypeptide bands, with molecular weights of approximately 41,500 and 28,000, in the outer membrane protein-rich fraction obtained from strains of serotype 1 through 10. These results indicated that outer membrane proteins from several serotype strains of A pleuropneumoniae possessed common antigenic determinants.
authors.affiliation: Research Center for Veterinary Science, Kitasato Institute, Tokyo, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Nakai
authors.forename: K
authors.initials: K
authors.lastname: Kawahara
authors.forename: Y
authors.initials: Y
authors.lastname: Horiguchi
authors.forename: H
authors.initials: H
authors.lastname: Danbara
authors.forename: K
authors.initials: K
authors.lastname: Kume
mesh_terms: D016977:Actinobacillus pleuropneumoniae / Q000145:classification / Q000276:immunology*; D000818:Animals; D000907:Antibodies, Bacterial / Q000276:immunology*; D000911:Antibodies, Monoclonal / Q000096:biosynthesis / Q000276:immunology*; D000942:Antigens, Bacterial / Q000276:immunology*; D001425:Bacterial Outer Membrane Proteins / Q000276:immunology; D004797:Enzyme-Linked Immunosorbent Assay; D000939:Epitopes / Q000276:immunology; D006825:Hybridomas; D015151:Immunoblotting; D008070:Lipopolysaccharides / Q000276:immunology; D011135:Polysaccharides, Bacterial / Q000276:immunology; D012703:Serotyping; D013552:Swine
chemical_list: D000907:Antibodies, Bacterial; D000911:Antibodies, Monoclonal; D000942:Antigens, Bacterial; D001425:Bacterial Outer Membrane Proteins; D000939:Epitopes; D008070:Lipopolysaccharides; D011135:Polysaccharides, Bacterial