RNase H2-initiated ribonucleotide excision repair.

RNase H2-initiated ribonucleotide excision repair.
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DOI:
10.1016/j.molcel.2012.06.035
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发表时间:
2012-09-28
期刊:
影响因子:
16
通讯作者:
Burgers, Peter M.
Burgers, Peter M.
中科院分区:
生物学1区
文献类型:
--
作者:
Sparks, Justin L.;Chon, Hyongi;Cerritelli, Susana M.;Kunkel, Thomas A.;Johansson, Erik;Crouch, Robert J.;Burgers, Peter M.

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核糖核苷酸通过复制型DNA聚合酶以约2个/kb的频率掺入DNA中,这使得它们成为细胞中最丰富的潜在DNA损伤形式。它们的去除对于恢复稳定完整的染色体是必不可少的。在这里,我们提出了一个完整的生化重建的核糖核苷酸切除修复(RER)途径与酶纯化的酿酒酵母。当核糖核苷酸被RNase H2切割,并进一步被瓣状核酸内切酶FEN 1切割时,RER是最有效的,其中链置换合成由DNA聚合酶δ、PCNA夹、其装载RFC进行,并由DNA连接酶I完成。我们观察到部分冗余的几种酶在这一途径。Exo 1以合理的效率取代FEN 1,Pol ε取代Pol δ。然而,在粗面内质网的切割步骤中,RNase H1不能替代RNase H2。
Ribonucleotides are incorporated into DNA by the replicative DNA polymerases at frequencies of about 2 per kb which makes them by far the most abundant form of potential DNA damage in the cell. Their removal is essential for restoring a stable intact chromosome. Here we present a complete biochemical reconstitution of the ribonucleotide excision repair (RER) pathway with enzymes purified from Saccharomyces cerevisiae. RER is most efficient when the ribonucleotide is incised by RNase H2, and further excised by the flap endonuclease FEN1 with strand displacement synthesis carried out by DNA polymerase δ, the PCNA clamp, its loader RFC, and completed by DNA ligase I. We observed partial redundancy for several of the enzymes in this pathway. Exo1 substitutes for FEN1 and Pol ε for Pol δ with reasonable efficiency. However, RNase H1 fails to substitute for RNase H2 in the incision step of RER.
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