title: R46-derived recombinant plasmids affecting DNA repair and mutation in E. coli.
abstract: Recombinant plasmids which render their host less mutable and more sensitive to some DNA-damaging agents have been isolated from the N-group plasmid R46. These plasmids have been physically mapped and found to originate from the region of R46 that has been deleted in pKM101. This deleted region is well removed from the muc region of R46 and pKM101 which is responsible for the mutator effects of these plasmids. The effect of these anti-mutagenic plasmids on the ability of pKM101 to complement umuC mutations has been examined, and they have been found to inhibit the complementation of such strains. We propose that these plasmids may code for a negative control function acting on the muc gene.
mesh_terms: D002470:Cell Survival / Q000528:radiation effects; D004260:DNA Repair; D004262:DNA Restriction Enzymes; D004274:DNA, Recombinant / Q000378:metabolism*; D004926:Escherichia coli / Q000187:drug effects / Q000235:genetics* / Q000528:radiation effects; D007700:Kinetics; D008741:Methyl Methanesulfonate / Q000494:pharmacology; D009154:Mutation; D010957:Plasmids / Q000187:drug effects / Q000528:radiation effects; D014466:Ultraviolet Rays
chemical_list: D004274:DNA, Recombinant; D008741:Methyl Methanesulfonate; D004262:DNA Restriction Enzymes