Scaffolding protein SPIDR/KIAA0146 connects the Bloom syndrome helicase with homologous recombination repair

Scaffolding protein SPIDR/KIAA0146 connects the Bloom syndrome helicase with homologous recombination repair
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支架蛋白 SPIDR/KIAA0146 将布卢姆综合征解旋酶与同源重组修复连接起来

DOI:
10.1073/pnas.1220921110
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发表时间:
2013-03
影响因子:
11.1
通讯作者:
Huang, Jun
Huang, Jun
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Dong, Shunli;Xie, Feng;Chen, Hongxia;Huang, Jun

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布卢姆综合征基因产物 BLM 是高度保守的 RecQ 家族的成员。一个新兴概念是 BLM 解旋酶与同源重组 (HR) 机制协作,帮助避免不良的 HR 事件并在 HR 反应过程中实现高度保真度。然而,人们对这种协调在体内如何发生的具体情况知之甚少。在这里,我们确定了一种称为 SPIDR(参与 DNA 修复的支架蛋白)的蛋白质作为 BLM 和 HR 机制之间的联系。 SPIDR 独立地与 BLM 和 RAD51 相互作用,并促进含有 BLM/RAD51 的具有生物学重要性的复合物的形成。与其作为 BLM 和 RAD51 焦点组装的支架蛋白的作用一致,SPIDR 耗尽的细胞显示姐妹染色单体交换率增加和 HR 缺陷。此外,SPIDR 缺失会导致基因组不稳定,并导致对 DNA 损伤剂过敏。我们认为,通过为 BLM 和 RAD51 在多功能 DNA 加工复合物中的合作提供支架,SPIDR 不仅可以调节 HR 的效率,还可以决定特定的 HR 通路。
The Bloom syndrome gene product, BLM, is a member of the highly conserved RecQ family. An emerging concept is the BLM helicase collaborates with the homologous recombination (HR) machinery to help avoid undesirable HR events and to achieve a high degree of fidelity during the HR reaction. However, exactly how such coordination occurs in vivo is poorly understood. Here, we identified a protein termed SPIDR (scaffolding protein involved in DNA repair) as the link between BLM and the HR machinery. SPIDR independently interacts with BLM and RAD51 and promotes the formation of a BLM/RAD51-containing complex of biological importance. Consistent with its role as a scaffolding protein for the assembly of BLM and RAD51 foci, cells depleted of SPIDR show increased rate of sister chromatid exchange and defects in HR. Moreover, SPIDR depletion leads to genome instability and causes hypersensitivity to DNA damaging agents. We propose that, through providing a scaffold for the cooperation of BLM and RAD51 in a multifunctional DNA-processing complex, SPIDR not only regulates the efficiency of HR, but also dictates the specific HR pathway.
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