title: Expression of pertussis toxin in Bordetella bronchiseptica and Bordetella parapertussis carrying recombinant plasmids.
abstract: Pertussis toxin is produced only by strains of Bordetella pertussis. Cloned genes encoding pertussis toxin from B. pertussis were transferred into Bordetella bronchiseptica and Bordetella parapertussis by conjugation. These transconjugants expressed pertussis toxin at levels comparable to those expressed by B. pertussis. The toxin made by these strains was biologically active in the Chinese hamster cell clumping assay, contained all five subunits, and was mostly periplasmic. Toxin expression appeared to be modulated in the same way as are the vir-regulated genes of B. pertussis. Introduction of these plasmids into B. pertussis failed to produce hypertoxigenic strains. Instead, these transconjugants underwent plasmid loss, gene deletions, or conversion to the avirulent phase.
authors.affiliation: Biologic Laboratories, Center for Disease Control of the Massachusetts Department of Public Health, Boston 02130.
authors.forename: C K
authors.initials: CK
authors.lastname: Lee
authors.forename: A
authors.initials: A
authors.lastname: Roberts
authors.forename: S
authors.initials: S
authors.lastname: Perrin
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology; D001884:Bordetella / Q000235:genetics*; D003001:Cloning, Molecular; D003227:Conjugation, Genetic; D005786:Gene Expression Regulation; D008970:Molecular Weight; D037342:Pertussis Toxin; D010567:Pertussis Vaccine / Q000235:genetics; D010957:Plasmids; D011994:Recombinant Proteins; D014614:Vaccines, Synthetic; D010566:Virulence Factors, Bordetella / Q000235:genetics* / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D010567:Pertussis Vaccine; D011994:Recombinant Proteins; D014614:Vaccines, Synthetic; D010566:Virulence Factors, Bordetella; D037342:Pertussis Toxin