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The activated form of the RecA protein (RecA) is known to be involved in the reactivation and mutagenesis of UV-irradiated bacteriophage lambda and in the expression of the SOS response in Escherichia coli K-12. The expression of the SOS response requires cleavage of the LexA repressor by RecA and the subsequent expression of LexA-controlled genes. The evidence presented here suggests that RecA induces the expression of a gene(s) that is not under LexA control and that is also necessary for maximal repair and mutagenesis of damaged phage. This conclusion is based on the chloramphenicol sensitivity of RecA -dependent repair and mutagenesis of damaged bacteriophage lambda in lexA(Def) hosts.

journal of bacteriology

Activated RecA protein may induce expression of a gene that is not controlled by the LexA repressor and whose function is required for mutagenesis and repair of UV-irradiated bacteriophage lambda