title: Identification of two novel genes encoding 97- to 99-kilodalton outer membrane proteins of Chlamydia pneumoniae.
abstract: Two genes encoding 97- to 99-kDa Chlamydia pneumoniae VR1310 outer membrane proteins (Omp4 and Omp5) with mutual similarity were cloned and sequenced. The proteins were shown to be constituents of the C. pneumoniae outer membrane complex, and the deduced amino acid sequences were similar to those of putative outer membrane proteins encoded by the Chlamydia psittaci and Chlamydia trachomatis gene families. By use of a monospecific polyclonal antibody against purified recombinant Omp4, it was shown that without heating, the protein migrated at 65 to 75 kDa in sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Immunoelectron microscopy showed that epitopes of Omp4 were exposed on the surface of C. pneumoniae elementary bodies, reticulate bodies, and outer membrane complex. Proteins encoded by the C. pneumoniae gene family seem to be dominant antigens in experimentally infected mice.
authors.affiliation: Department of Medical Microbiology and Immunology, University of Aarhus, Denmark. katrinek@biobase.dk
authors.forename: K
authors.initials: K
authors.lastname: Knudsen
authors.forename: A S
authors.initials: AS
authors.lastname: Madsen
authors.forename: P
authors.initials: P
authors.lastname: Mygind
authors.forename: G
authors.initials: G
authors.lastname: Christiansen
authors.forename: S
authors.initials: S
authors.lastname: Birkelund
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000907:Antibodies, Bacterial / Q000096:biosynthesis; D000942:Antigens, Bacterial / Q000276:immunology; D001425:Bacterial Outer Membrane Proteins / Q000235:genetics* / Q000276:immunology / Q000378:metabolism; D001426:Bacterial Proteins / Q000276:immunology; D016993:Chlamydophila pneumoniae / Q000235:genetics* / Q000276:immunology; D003001:Cloning, Molecular; D004274:DNA, Recombinant / Q000302:isolation & purification; D004591:Electrophoresis, Polyacrylamide Gel; D005798:Genes, Bacterial / Q000276:immunology; D006367:HeLa Cells; D006801:Humans; D015151:Immunoblotting; D051379:Mice; D008810:Mice, Inbred C57BL; D008969:Molecular Sequence Data; D008970:Molecular Weight; D017422:Sequence Analysis, DNA
chemical_list: D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D001425:Bacterial Outer Membrane Proteins; D001426:Bacterial Proteins; D004274:DNA, Recombinant