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FEN1
flap structure-specific endonuclease 1
Structure-specific nuclease with 5'-flap endonuclease and 5'-3' exonuclease activities involved in DNA replication and repair. During DNA replication, cleaves the 5'-overhanging flap structure that is generated by displacement synthesis when DNA polymerase encounters the 5'-end of a downstream Okazaki fragment. It enters the flap from the 5'-end and then tracks to cleave the flap base, leaving a nick for ligation. Also involved in the long patch base excision repair (LP-BER) pathway, by cleaving within the apurinic/apyrimidinic (AP) site-terminated flap. Acts as a genome stabilization factor that prevents flaps from equilibrating into structurs that lead to duplications and deletions. Also possesses 5'-3' exonuclease activity on nicked or gapped double-stranded DNA, and exhibits RNase H activity. Also involved in replication and repair of rDNA and in repairing mitochondrial DNA.
| Gene Name: | flap structure-specific endonuclease 1 |
| Synonyms: | FEN1, DNase IV, FEN-1, HFEN-1, Flap endonuclease 1, MF1, RAD2, Maturation factor 1, Maturation factor-1 |
| Target Sequences: | NM_004111 NP_004102.1 P39748 |
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