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J. Biol. Chem., Vol. 277, Issue 17, 14379-14389, April 26, 2002
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,
From the Department of Biochemistry and Biophysics, University of
Rochester School of Medicine and Dentistry, Rochester, New York
14642
Flap endonuclease 1 (FEN1) is a
structure-specific nuclease that cleaves substrates containing
unannealed 5'-flaps during Okazaki fragment processing. Cleavage
removes the flap at or near the point of annealing. The preferred
substrate for archaeal FEN1 or the 5'-nuclease domains of bacterial DNA
polymerases is a double-flap structure containing a 3'-tail on the
upstream primer adjacent to the 5'-flap. We report that FEN1 in
Saccharomyces cerevisiae (Rad27p) exhibits a similar
specificity. Cleavage was most efficient when the upstream primer
contained a 1-nucleotide 3'-tail as compared with the fully annealed
upstream primer traditionally tested. The site of cleavage was
exclusively at a position one nucleotide into the annealed region,
allowing human DNA ligase I to seal all resulting nicks. In contrast, a
portion of the products from traditional flap substrates is not
ligated. The 3'-OH of the upstream primer is not critical for
double-flap recognition, because Rad27p is tolerant of modifications.
However, the positioning of the 3'-nucleotide defines the site of
cleavage. We have tested substrates having complementary tails that
equilibrate to many structures by branch migration. FEN1 only cleaved
those containing a 1-nucleotide 3'-tail. Equilibrating substrates
containing 12-ribonucleotides at the end of the 5'-flap simulates the
situation in vivo. Rad27p cleaves this substrate in the
expected 1-nucleotide 3'-tail configuration. Overall, these results
suggest that the double-flap substrate is formed and cleaved during
eukaryotic DNA replication in vivo.
Present address: Center of Aging and Developmental Biology,
University of Rochester, 601 Elmwood Ave., Box 645, Rochester, NY 14642.
§
To whom correspondence should be addressed: Dept. of Biochemistry
and Biophysics, University of Rochester Medical Center, 601 Elmwood
Ave., Box 712, Rochester, NY 14642. Tel.: 585-275-3269; Fax:
585-271-2683; E-mail: robert_bambara@urmc.rochester.edu.
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