Multifaceted role of the Topo IIIα-RMI1-RMI2 complex and DNA2 in the BLM-dependent pathway of DNA break end resection.

Multifaceted role of the Topo IIIα-RMI1-RMI2 complex and DNA2 in the BLM-dependent pathway of DNA break end resection.
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DOI:
10.1093/nar/gku803
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发表时间:
2014
影响因子:
14.9
通讯作者:
Sung P
Sung P
中科院分区:
生物学2区
文献类型:
--
作者:
Daley JM;Chiba T;Xue X;Niu H;Sung P

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BLM 是一种在布卢姆综合征中突变的 RecQ 家族 DNA 解旋酶,参与同源重组的两个阶段:5' DNA 末端切除和双霍利迪连接体溶解。 BLM 与 Topo IIIα、RMI1 和 RMI2 存在于复合物中。在此,我们使用纯化的人蛋白重构系统探讨了 Topo IIIα 和 RMI1-RMI2 在切除中的作用。我们表明,Topo IIIα 以 RMI1-RMI2 增强的方式刺激 BLM 解旋 DNA,并且切除的持续性依赖于 Topo IIIα-RMI1-RMI2 复合物。 Topo IIIα 定位于双链断裂的末端,因此与切除因子的招募有关。虽然单链 DNA 结合蛋白 RPA 在施加 5' 至 3' 极性切除方面发挥着重要作用,但 Topo IIIα 在这方面也做出了贡献。此外,我们还发现 DNA2 可以刺激 BLM 的解旋酶活性。因此,我们的结果揭示了 Topo IIIα–RMI1-RMI2 整体和 DNA2 在 DNA 切除反应中的多方面作用。
BLM, a RecQ family DNA helicase mutated in Bloom's Syndrome, participates in homologous recombination at two stages: 5′ DNA end resection and double Holliday junction dissolution. BLM exists in a complex with Topo IIIα, RMI1 and RMI2. Herein, we address the role of Topo IIIα and RMI1-RMI2 in resection using a reconstituted system with purified human proteins. We show that Topo IIIα stimulates DNA unwinding by BLM in a manner that is potentiated by RMI1-RMI2, and that the processivity of resection is reliant on the Topo IIIα–RMI1-RMI2 complex. Topo IIIα localizes to the ends of double-strand breaks, thus implicating it in the recruitment of resection factors. While the single-stranded DNA binding protein RPA plays a major role in imposing the 5′ to 3′ polarity of resection, Topo IIIα also makes a contribution in this regard. Moreover, we show that DNA2 stimulates the helicase activity of BLM. Our results thus uncover a multifaceted role of the Topo IIIα–RMI1-RMI2 ensemble and of DNA2 in the DNA resection reaction.
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