title: Cloning and DNA sequence of the omc gene encoding the outer membrane protein-macromolecular complex from Neisseria gonorrhoeae.
abstract: The omc gene, encoding the outer membrane protein-macromolecular complex (OMP-MC), was cloned in two pieces from Neisseria gonorrhoeae 2686. The 5' fragment of the omc gene included a promoter sequence, as indicated by its unregulated expression in Escherichia coli. Attempts to reconstruct an intact omc gene were unsuccessful, suggesting that expression of the complete OMP-MC protein was toxic to E. coli. Complete sequence determination revealed a coding sequence of 2,133 nucleotides; the deduced amino acid sequence indicated a mature protein of 687 amino acids with an NH2-terminal signal peptide of 24 amino acids. Analysis of the deduced amino acid sequence revealed that the NH2-terminal half of OMP-MC is generally hydrophilic, while the COOH-terminal portion contains alternating hydrophobic and hydrophilic regions. Serological analyses demonstrated that the NH2-terminal portion of OMP-MC is exposed on the gonococcal surface and the COOH-terminal portion is membrane associated.
authors.affiliation: Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis 46223.
authors.forename: W M
authors.initials: WM
authors.lastname: Tsai
authors.forename: S H
authors.initials: SH
authors.lastname: Larsen
authors.forename: C E
authors.initials: CE
authors.lastname: Wilde
mesh_terms: D000595:Amino Acid Sequence; D001425:Bacterial Outer Membrane Proteins / Q000235:genetics* / Q000302:isolation & purification; D001483:Base Sequence; D003001:Cloning, Molecular; D004269:DNA, Bacterial / Q000302:isolation & purification*; D004926:Escherichia coli / Q000235:genetics; D005798:Genes, Bacterial; D005822:Genetic Vectors; D046911:Macromolecular Substances; D008969:Molecular Sequence Data; D009344:Neisseria gonorrhoeae / Q000235:genetics*; D014162:Transfection
chemical_list: D001425:Bacterial Outer Membrane Proteins; D004269:DNA, Bacterial; D046911:Macromolecular Substances