title: The unique conjugation system of IncHI3 plasmid MIP233.
abstract: The conjugation system of the IncHI3 plasmid MIP233 was studied using a transfer-derepressed Tn5-insertion mutant. The conjugative pili of this plasmid were short pointed rods resembling rigid pili, with a well-defined modal length. Unlike plasmids with rigid pili, the MIP233 mutant mediated a surface + liquid conjugation system. The pili were serologically different from all known pilus types including H pili, and did not act as receptors for any known pilus-specific bacteriophage. They converted the surface conjugation system of RP4 to a surface + liquid one. Antiserum to pili of the mutant plasmid inhibited transfer of the wild-type plasmid MIP233, demonstrating that it contained only one transfer system.
mesh_terms: D000907:Antibodies, Bacterial / Q000276:immunology; D003227:Conjugation, Genetic; D004251:DNA Transposable Elements; D004926:Escherichia coli / Q000235:genetics*; D010861:Fimbriae, Bacterial / Q000276:immunology / Q000648:ultrastructure; D009154:Mutation; D010957:Plasmids; D013696:Temperature
chemical_list: D000907:Antibodies, Bacterial; D004251:DNA Transposable Elements