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Bacteriophage lambda can recombine in recBC sbcB sbcC mutant cells by using its own gene orf, the Escherichia coli recO, recR, and recF genes, or both. Expression of an orf-containing plasmid complements the recombination defects of orf mutant phage. However, this clone does not complement a recO mutation for conjugational recombination or recO, recR, or recF mutations for repair of UV-induced DNA damage. A plasmid clone of orf produces a protein with an apparent molecular mass of 15 kDa.

journal of bacteriology

The phage lambda orf gene encodes a trans-acting factor that suppresses Escherichia coli recO, recR, and recF mutations for recombination of lambda but not of E. coli