DNA polymerase β-mediated long patch base excision repair -: Poly(ADP-ribose) polymerase-1 stimulates strand displacement DNA synthesis
DNA polymerase β-mediated long patch base excision repair -: Poly(ADP-ribose) polymerase-1 stimulates strand displacement DNA synthesis
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DOI:
10.1074/jbc.c100292200
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发表时间:
2001-08-31
影响因子:
4.8
通讯作者:
Wilson, SH
中科院分区:
文献类型:
--
作者:
Prasad, R;Lavrik, OI;Wilson, SH
Recently, photoaffinity labeling experiments with mouse cell extracts suggested that PARP-1 functions as a surveillance protein for a stalled DER intermediate. To further understand the role of PARP-1 in DER, we examined the DNA synthesis and flap excision steps in long patch DER using a reconstituted system containing a 34-base pair DER substrate and five purified human enzymes: uracil-DNA glycosylase, apurinic/apyrimidinic endonuclease, DNA polymerase beta, flap endonuclease-1 (FEN-1), and PARP-1. PARP-1 stimulates strand displacement DNA synthesis by DNA polymerase 13 in this system; this stimulation is dependent on the presence of FEN-1. PARP-1 and FEN-1, therefore, cooperate to activate long patch DER. The results are discussed in the context of a model for DER sub-pathway choice, illustrating a dual role for PARP-1 as a surveillance protein for a stalled DER intermediate and an activating factor for long patch DER DNA synthesis.