Abstract
Insertion of phage λ DNA into the normal attachment site of the DNA of the host Escherichia coli has been studied by ultracentrifugation analysis of the conversion of covalent circles of F′450 (F′ gal att λ bio ) to F′450(λ) circles. We have found that integration proceeds at the normal rate if, in addition to the int gene product and a proper combination of phage and bacterial attachment sites, a large pool of λ DNA and some activity of the excision gene xis are present. In addition, turnoff of both phage DNA synthesis and xis gene activity are required.
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