title: Effect of pKM101 plasmid on lethal and mutagenic damage in UV-irradiated E. coli strains.
abstract: Introduction of the R-factor plasmid pKM101 increased resistance to UV-killing in uvr lexA(Ind-) recA+ strains of E. coli K12 as well as B, while their UV mutability was not affected. Similar effects were also observed in those strains when the 18-B plasmid (a pBR322 derivative carrying the region (about 5 kb) of the 35.4 kb pKM101 plasmid) was introduced. The muc genes which are considered to be involved in error-prone repair are contained in 18-B. These results suggest the possibility that the pKM101 effect requires the host recA gene and a common genetic region, including the muc genes, in both plasmids and is associated with some unmutable repair systems.
mesh_terms: D004260:DNA Repair; D004269:DNA, Bacterial / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics* / Q000528:radiation effects; D005798:Genes, Bacterial; D009154:Mutation; D010957:Plasmids; D011815:R Factors; D014466:Ultraviolet Rays
chemical_list: D004269:DNA, Bacterial