title: 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.
abstract: 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.
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism; D010582:Bacteriophage lambda / Q000235:genetics* / Q000528:radiation effects; D002701:Chloramphenicol / Q000494:pharmacology; D004926:Escherichia coli / Q000235:genetics* / Q000378:metabolism; D005786:Gene Expression Regulation; D005798:Genes, Bacterial; D007700:Kinetics; D009154:Mutation; D011938:Rec A Recombinases / Q000378:metabolism*; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism; D012697:Serine Endopeptidases; D000099160:LexA Repressor Protein
chemical_list: D001426:Bacterial Proteins; D002701:Chloramphenicol; D011938:Rec A Recombinases; D012097:Repressor Proteins; D012697:Serine Endopeptidases; D000099160:LexA Repressor Protein