Abstract
The FLP protein of the 2 microns plasmid of Saccharomyces cerevisiae promotes conservative site-specific recombination between DNA sequences that contain the FLP recognition target (FRT). FLP binds to each of the three 13 base pair symmetry elements in the FRT site in a site-specific manner. We have probed both major and minor groove contacts of FLP using dimethyl sulphate, monoacetyl-4-hydroxyaminoquinoline 1-oxide and potassium permanganate and find that the protein displays extensive interactions with residues of both the major and minor grooves of 10 base pairs of each symmetry element. We find no evidence that the FRT site assumes a single-stranded conformation upon FLP binding.
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