title: Mutations in the 2-microns circle site-specific recombinase that abolish recombination without affecting substrate recognition.
abstract: The site-specific recombinase encoded by the yeast plasmid 2-microns circle (FLP) forms a transient covalent linkage with its substrate DNA via a tyrosine residue, which appears to be located near its COOH terminus. The homology of the COOH terminus of FLP with that of the Int family of recombinases suggests that tyrosine-343 of FLP could be involved in forming the DNA-protein bridge. We have mutated tyrosine-343 to a phenylalanine or serine. We demonstrate that the binding of each of the two mutant proteins to its substrate is indistinguishable from that of wild-type FLP. However, both mutant proteins are incapable of catalyzing strand cleavage and recombination.
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D004254:DNA Nucleotidyltransferases / Q000235:genetics* / Q000378:metabolism; D004926:Escherichia coli / Q000201:enzymology / Q000235:genetics*; D009154:Mutation; D010649:Phenylalanine; D010957:Plasmids; D011485:Protein Binding; D012694:Serine; D013379:Substrate Specificity
chemical_list: D012694:Serine; D010649:Phenylalanine; D004254:DNA Nucleotidyltransferases; C045119:FLP recombinase