title: Rec-dependent and Rec-independent recombination of plasmid-borne duplications in Escherichia coli K12.
abstract: Plasmidic recombination in E. coli K12 has been previously demonstrated to be dependent on the host rec genotype. The construction of plasmids that carry a duplication within an antibiotic-resistance gene is described. Recombination between the direct repeats recreates an active antibiotic-resistance gene, allowing quantitative analysis of recombination frequencies in a closely related set of E. coli K12 strains carrying various rec mutations. Using this system, intraplasmidic recombination of a duplication within the pBR322 tetracycline-resistance gene is shown to be rec-dependent while recombination of a similar duplication within the kanamycin-resistance gene of Tn903 is shown to be independent of recA, recB, recC, recE, recF and sbcB.
authors.forename: M
authors.initials: M
authors.lastname: Matfield
authors.forename: R
authors.initials: R
authors.lastname: Badawi
authors.forename: W J
authors.initials: WJ
authors.lastname: Brammar
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics*; D004262:DNA Restriction Enzymes; D004926:Escherichia coli / Q000235:genetics*; D029968:Escherichia coli Proteins; D043211:Exodeoxyribonuclease V; D005090:Exodeoxyribonucleases / Q000235:genetics*; D005796:Genes; D005798:Genes, Bacterial; D005838:Genotype; D009154:Mutation; D010957:Plasmids; D011938:Rec A Recombinases / Q000235:genetics*; D011995:Recombination, Genetic
chemical_list: D001426:Bacterial Proteins; D029968:Escherichia coli Proteins; D011938:Rec A Recombinases; D005090:Exodeoxyribonucleases; C038225:recE protein, E coli; D043211:Exodeoxyribonuclease V; C468322:exodeoxyribonuclease V, E coli; D004262:DNA Restriction Enzymes