title: [Interaction (integration and excision) of the pRP19.6 plasmid, a derivative of the RP1 plasmid containing duplicated sequence IS21, with the chromosome of Escherichia coli K12].
abstract: A pRP19.6 plasmid is the derivative of the temperature sensitive RPlts12 plasmid and contains a duplicated IS21 (IS8) element. Using temperature sensitive pRP19.6 replication, Hfr strains have been obtained by integration of the plasmid into the chromosome of E. coli rec+ and recA- cells and their properties were studied. According to the results obtained, pRP19.6 insertion into the genome of the rec+ bacteria IS reversible, and its integration into the chromosome of the recA- bacteria produced the stable Hfr strains. To elucidate the mechanism of pRP19.6 excision from the bacterial chromosome, plasmids of R+ transconjugates generated with a low frequency in the crosses between the stable Hfr strains and the rec+ recipients were analyzed. It was shown that the stable Hfr clones might produce stable R1 plasmids as well as a family of deletion KmsTra- derivatives of the pRP19.6. The structure of the KmsTra- was investigated and the mechanism of their formation was proposed. In the light of the data obtained, prospects of pRP19.6 practical application are discussed.
mesh_terms: D002872:Chromosome Deletion; D002876:Chromosomes, Bacterial; D003001:Cloning, Molecular; D004262:DNA Restriction Enzymes; D004352:Drug Resistance, Microbial; D004926:Escherichia coli / Q000235:genetics*; D009154:Mutation; D010957:Plasmids; D011995:Recombination, Genetic
chemical_list: D004262:DNA Restriction Enzymes
vernacular_title: Vzaimodeĭstvie (vstraivanie i iskliuchenie) plazmidy pRP19.6-proizvodnoĭ RP1, soderzhashcheĭ duplitsirovannuiu posledovatel'nost' IS21, s khromosomoĭ Escherichia coli K12.