Enzymatic induction of DNA double-strand breaks in gamma-irradiated Escherichia coli K-12.
The polA1 mutation increases the sensitivity of E. coli K-12 by killing by gamma-irradiation in air by a factor of 2.9 and increases the yield of DNA double-strand breaks by a factor of 2.5. These additional DNA double-strand breaks appear to be due to the action of nucleases in the polA1 strain rather than to the rejoining of radiation-induced double-strand breaks in the pol+ strain. This conclusion is based upon the observation that gamma-irradiation at 3 degrees did not affect the yield of DNA double-strand breaks in the pol+ strain, but decreased the yield in the polA1 strain by a factor of 2.2. Irradiation of the polA1 strain at 3 degrees followed by incubation at 3 degrees for 20 min before plating resulted in approximately a 1.5-fold increase in the D0. The yield of DNA double-strand breaks was reduced by a factor of 1.5. The pol+ strain, however, did not show the protective effect of the low temperature incubation upon either survival or DNA double-strand breakage. We suggest that the increased yield of DNA double-strand breaks in the polA1 strain may be the result of the unsuccessful exision repair of ionizing radiation-induced DNA base damage.
D002470:Cell Survival / Q000528:radiation effects; D004254:DNA Nucleotidyltransferases / Q000172:deficiency; D004260:DNA Repair; D004269:DNA, Bacterial / Q000528:radiation effects*; D004307:Dose-Response Relationship, Radiation; D004926:Escherichia coli / Q000201:enzymology*; D005720:Gamma Rays; D008954:Models, Biological; D009154:Mutation; D011830:Radiation Effects; D013696:Temperature
D004269:DNA, Bacterial; D004254:DNA Nucleotidyltransferases