P. mirabilis RecA protein catalyses cleavage of E. coli LexA protein and the lambda repressor in vitro.
The cloned recA+ gene of proteus mirabilis substitutes for a defective RecA protein in Escherichia coli recA- mutants, and restores recombination, repair and phage induction functions to near normal levels. In a previous report, we described the purification and characterisation of the recombination activities of the P. mirabilis RecA protein (West et al. 1983b ). In this paper, we show that the purified protein catalyses the cleavage of both the Escherichia coli LexA protein and the bacteriophage lambda repressor in vitro. These results provide a direct biochemical basis for the interspecies complementation observed in vivo and suggest that P. mirabilis has an SOS regulatory network similar to that of E. coli.
D001426:Bacterial Proteins / Q000378:metabolism*; D004260:DNA Repair; D004269:DNA, Bacterial / Q000378:metabolism; D004268:DNA-Binding Proteins; D004926:Escherichia coli / Q000235:genetics* / Q000378:metabolism; D011499:Protein Processing, Post-Translational; D011513:Proteus mirabilis / Q000235:genetics*; D011938:Rec A Recombinases / Q000235:genetics / Q000502:physiology*; D012097:Repressor Proteins / Q000378:metabolism*; D012697:Serine Endopeptidases; D013045:Species Specificity; D014157:Transcription Factors / Q000378:metabolism*; D014764:Viral Proteins; D054334:Viral Regulatory and Accessory Proteins; D000099160:LexA Repressor Protein
D001426:Bacterial Proteins; D004269:DNA, Bacterial; D004268:DNA-Binding Proteins; D011938:Rec A Recombinases; D012097:Repressor Proteins; D012697:Serine Endopeptidases; D014157:Transcription Factors; D014764:Viral Proteins; D054334:Viral Regulatory and Accessory Proteins; D000099160:LexA Repressor Protein; C016649:phage repressor proteins