A protein produced by male strains of Escherichia coli K-12 which increases the yield of recombinants in conjugation: Its nature and mode of action
1973
A protein present in filtrates of E. coli K-12 male strains is responsible for their ability to increase the yield of recombinants in conjugation and to inhibit nitrogen mustard after-effect (NMAE) in F- cells. The protein, designated “recombination-stimulating factor” (RSF), was purified 200–300 times from HfrC filtrate. Two Rsf- mutants of strain HfrC were isolated which fail to produce RSF; these mutations affect an episomal gene. RSF action involves the attachment of RSF to the F- cell surface and requires the integrity of the RSF-cell complex. Some step of recombination after the transfer of the donor chromosomal fragment into the recipient is affected by RSF.
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