title: Plasmid pKM101-mediated mutagenesis in Escherichia coli is inducible.
abstract: A tif-1 umuC36 double mutant of Escherichia coli was constructed. It has been found that the umuC36 mutation prevents both increased spontaneous mutagenesis and enhanced reactivation of UV-irradiated lambda, phenomena normally observed in the tif-1 strain grown at 42 degrees C. When the plasmid pKM101 was introduced into tif-1 umuC36, an elevated spontaneous reversion rate of the his-4 mutation observed at 30 degrees C was further increased 6-fold at 42 degrees C. This was accompanied by a 10-fold increase in the ability of tif-1 umuC36 containing pKM101 and grown before infection at 42 degrees C to reactivate UV-irradiated lambda.
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics; D004260:DNA Repair; D004269:DNA, Bacterial / Q000528:radiation effects; D004926:Escherichia coli / Q000235:genetics*; D005786:Gene Expression Regulation; D005798:Genes, Bacterial / Q000528:radiation effects; D009154:Mutation; D010957:Plasmids; D014466:Ultraviolet Rays
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial