title: Identification of six major outer membrane proteins from Actinobacillus actinomycetemcomitans.
abstract: We have identified six major sarcosyl-insoluble outer membrane proteins (Omp) of Actinobacillus actinomycetemcomitans Y4, and designated them as Omp100, Omp64, Omp39, Omp29, Omp18 and Omp16 according to the molecular mass. A similar N-terminal sequence was found in the first 15 amino acid residues of Omp16 and Omp18. The N-terminal sequence of Omp29 matched perfectly with the sequence previously identified. We cloned and determined the DNA sequences of three complete genes encoding Omp100, Omp64 and Omp18/16, and one incomplete gene encoding Omp39. Each Omp revealed homologies with some bacterial virulence factors responsible for adhesion, invasion, serum resistance, or protein antigenicity. Serum from patients with periodontitis suspected to be related to A. actinomycetemcomintans infection strongly reacted with Omp100, Omp29 and Omp16 as did serum from mice immunized with A. actinomycetemcomitans Y4 whole bacteria. These findings suggest that Omps of A. actinomycetemcomitans can be associated with periodontal disease.
authors.affiliation: Department of Microbiology, Hiroshima University Faculty of Dentistry, Kasumi 1-2-3, Minami-ku, Hiroshima City, Japan. hkomatsu@hiroshima-u.ac.jp
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Komatsuzawa
authors.forename: Ryuji
authors.initials: R
authors.lastname: Asakawa
authors.forename: Toshihisa
authors.initials: T
authors.lastname: Kawai
authors.forename: Kyoko
authors.initials: K
authors.lastname: Ochiai
authors.forename: Tamaki
authors.initials: T
authors.lastname: Fujiwara
authors.forename: Martin A
authors.initials: MA
authors.lastname: Taubman
authors.forename: Masaru
authors.initials: M
authors.lastname: Ohara
authors.forename: Hidemi
authors.initials: H
authors.lastname: Kurihara
authors.forename: Motoyuki
authors.initials: M
authors.lastname: Sugai
mesh_terms: D016976:Aggregatibacter actinomycetemcomitans / Q000235:genetics* / Q000276:immunology; D000595:Amino Acid Sequence; D000818:Animals; D001425:Bacterial Outer Membrane Proteins / Q000235:genetics* / Q000378:metabolism; D015153:Blotting, Western; D016680:Genome, Bacterial; D006801:Humans; D007106:Immune Sera / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D010518:Periodontitis / Q000276:immunology; D020033:Protein Isoforms / Q000235:genetics / Q000378:metabolism
chemical_list: D001425:Bacterial Outer Membrane Proteins; D007106:Immune Sera; D020033:Protein Isoforms