Cleavage-dependent Ligation by the FLP Recombinase CHARACTERIZATION OF A MUTANT FLP PROTEIN WITH AN ALTERATION IN A CATALYTIC AMINO ACID (∗)

The FLP recombinase of the 2 microM plasmid of Saccharomyces cerevisiae belongs to the integrase family of recombinases whose members have in common four absolutely conserved residues (Arg-191, His-305, Arg-308, and Tyr-343). We have studied the mutant protein FLP R308K in which the arginine residue at position 308 has been replaced by lysine. Although FLP R308K was previously reported to be defective in ligation of certain substrates (Pan, G., …