Tags: Protein.
Flap endonuclease 1 is an enzyme that in humans is encoded by the FEN1 gene.The protein encoded by this gene removes 5′ overhanging flaps in DNA repair and processes the 5′ ends of Okazaki fragments in lagging strand DNA synthesis. Direct physical interaction between this protein and AP endonuclease 1 during long-patch base excision repair provides coordinated loading of the proteins onto the substrate thus passing the substrate from one enzyme to another.