Abstract

We describe a method for isolating and characterizing intermediates in the binding of the FLP recombinase, encoded by the yeast plasmid 2-micron circle to its target sequence. On a wild-type substrate, three specific complexes are formed. Footprinting analysis of the gelpurified complexes shows that each complex is the result of a unique FLP-DNA association. On the basis of the behavior of various FLP target sequences in the gel-binding assay, we propose a model describing the steps that lead to the formation of a stable FLP-DNA complex.

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