RecBC and RecF recombination pathways and the induced precise excision of Tn10 in Escherichia coli.
Mitomycin C (MMC) treatment or mutations in uvrD enhance the frequency of Tn10 precise excision. We have shown previously that several repair-recombination genes, such as recA, ruv and recF are involved in the induced excision process. In this study, we find that other genes belonging to the RecBC and RecF sexual recombination pathways also participate in this process since mutations in recB, sbcB or recO diminish, though to different degrees, the frequency of Tn10 precise excision induced by MMC treatment or by uvrD mutants. Pairwise combinations of some of these mutations were also tested for Tn10 induced precise excision; most of these double mutants showed additive effects in reducing the frequency of the excision process. The results of these studies suggest that recombinational-repair genes, particularly recF, sbcB and recO have different roles in the induced excision of Tn10 than in recombinational mating.
Nagel
R
R
CEFYBO, CONICET, Buenos Aires, Argentina. nagel@cefybo.edu.ar
Chan
A
A
D000251:Adenosine Triphosphatases / Q000235:genetics; D001426:Bacterial Proteins / Q000235:genetics*; D004265:DNA Helicases; D004251:DNA Transposable Elements; D004268:DNA-Binding Proteins / Q000235:genetics*; D004926:Escherichia coli / Q000235:genetics*; D029968:Escherichia coli Proteins; D043211:Exodeoxyribonuclease V; D005090:Exodeoxyribonucleases / Q000235:genetics*; D005798:Genes, Bacterial; D016685:Mitomycin / Q000494:pharmacology; D011995:Recombination, Genetic
D001426:Bacterial Proteins; D004251:DNA Transposable Elements; D004268:DNA-Binding Proteins; D029968:Escherichia coli Proteins; C489340:recF protein, E coli; D016685:Mitomycin; C066218:recF protein, Bacteria; D005090:Exodeoxyribonucleases; D043211:Exodeoxyribonuclease V; C468322:exodeoxyribonuclease V, E coli; D000251:Adenosine Triphosphatases; C506746:UvrD protein, E coli; D004265:DNA Helicases