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Alleles responsible for X-ray-sensitive characteristics of three mutants ofEscherichia coli B, which were also sensitive to ultraviolet (UV) irradiation, were mapped nearmetE locus, and namedres-1, res-2 , andres-3 . All theres − mutants showed no host cell reactivability (Hcr− ) for transducing deoxyribonucleic acid (DNA) of P1 phage irradiated by UV but they were Hcr+ for infective DNA of P1 phage. Furthermore, they showed no detectable activity of DNA polymerase. Characteristics of alleleres-1 were studied in detail. The mutantres-1 uvr + showed an extensive degradation of DNA after UV irradiation. Double mutants carryingres-1 uvrA − ,res-1 uvrB − , andres-1 uvrC − showed no marked increase in UV sensitivity beyond that of theuvr − single mutants and only negligible UV-induced DNA degradation. Theuvr − mutations showed no such suppressive effect on DNA degradation induced by X rays in these double mutants. It is concluded thatres − mutants are defective in the second step (repair synthesis) of the excision repair process and that DNA polymerase is partly responsible for the assumed resynthesis step.

Genetic and Molecular Characteristics of X-Ray-Sensitive Mutants of Escherichia coli Defective in Repair Synthesis