Abstract
Induction of bacteriophage lambda is one of the consequences of the “SOS response” in E. coli resulting from damage to the host DNA.(1,2) This complex process appears to be mediated by the rec A protein,(3,4) resulting in the cleavage of the lambda repressors(5) and ensuing expression of phage genes. The repressor-cleavage activity of the rec A protein is dependent on the presence of single-stranded DNA,(6) presumably generated as a result of DNA damage. DNA damage, then, leads to the appearance of an “activated” rec A protein,(7) which cleaves the repressor of the genes of the lytic cycle (see Reference 8 for review). Agents that damage DNA can thus be monitored by looking for the appearance of bacteriophage. Other SOS functions that have been monitored after DNA damage include mutagenesis, filamentation, and DNA repair activity.(2,9)
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