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- W1974573561 abstract "The flap endonuclease, FEN1, plays a critical role in DNA replication and repair. Human FEN1 exhibits both a 5‘ to 3‘ exonucleolytic and a structure-specific endonucleolytic activity. On primer−template substrates containing an unannealed 5‘-tail, or flap structure, FEN1 employs a unique mechanism to cleave at the point of annealing, releasing the 5‘-tail intact. FEN1 appears to track along the full length of the flap from the 5‘-end to the point of cleavage. Substrates containing structural modifications to the flap have been used to explore the mechanism of tracking. To determine whether the nuclease must recognize a succession of nucleotides on the flap, chemical linkers were used to replace an interior nucleotide. The nuclease could readily traverse this site. The footprint of the nuclease at the time of cleavage does not extend beyond 25 nucleotides on the flap. Eleven-nucleotide branches attached to the flap beyond the footprinted region do not prevent cleavage. Single- or double-thymine dimers also allow cleavage. cis-Platinum adducts outside the protected region are moderately inhibitory. Platinum-modified branch structures are completely inert to cleavage. These results show that some flap modifications can prevent or inhibit tracking, but the tracking mechanism tolerates a variety of flap modifications. FEN1 has a flexible loop structure through which the flap has been proposed to thread. However, efficient cleavage of branched structures is inconsistent with threading the flap through a hole in the protein." @default.
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- W1974573561 date "1999-09-11" @default.
- W1974573561 modified "2023-10-01" @default.
- W1974573561 title "Effect of Flap Modifications on Human FEN1 Cleavage" @default.
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- W1974573561 doi "https://doi.org/10.1021/bi991321u" @default.
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