LAP2α preserves genome integrity through assisting RPA deposition on damaged chromatin.

LAP2α preserves genome integrity through assisting RPA deposition on damaged chromatin.
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LAP2α 通过协助 RPA 在受损染色质上沉积来保持基因组完整性

DOI:
10.1186/s13059-022-02638-6
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发表时间:
2022-02-28
期刊:
影响因子:
12.3
通讯作者:
Shi L
Shi L
中科院分区:
生物学1区
文献类型:
--
作者:
Bao K;Zhang Q;Liu S;Song N;Guo Q;Liu L;Tian S;Hao J;Zhu Y;Zhang K;Ai D;Yang J;Yao Z;Foisner R;Shi L

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被复制蛋白A(RPA)包裹的单链DNA(ssDNA)是DNA损伤反应中基因组维持因子招募和交换的关键平台。然而,ssDNA - RPA中间产物的形成是如何被调控的仍不清楚。 在此,我们报道核纤层相关蛋白LAP2α与RPA存在物理关联,并且LAP2α通过其与RPA1的物理接触优先促进RPA在受损染色质上的沉积。重要的是,LAP2α促进的RPA与ssDNA的结合在保护复制叉、激活ATR以及修复受损DNA方面发挥关键作用。我们进一步证明,LAP2α促进RPA在受损染色质上加载的偏好性取决于多聚ADP - 核糖聚合酶PARP1,而非多聚(ADP - 核糖基)化。 我们的研究为DNA损伤时RPA的沉积提供了机制上的见解,并揭示了LAP2α在基因组保护中的作用。 网络版包含补充材料,可在10.1186/s13059 - 022 - 02638 - 6获取。
Single-stranded DNA (ssDNA) coated with replication protein A (RPA) acts as a key platform for the recruitment and exchange of genome maintenance factors in DNA damage response. Yet, how the formation of the ssDNA-RPA intermediate is regulated remains elusive. Here, we report that the lamin-associated protein LAP2α is physically associated with RPA, and LAP2α preferentially facilitates RPA deposition on damaged chromatin via physical contacts between LAP2α and RPA1. Importantly, LAP2α-promoted RPA binding to ssDNA plays a critical role in protection of replication forks, activation of ATR, and repair of damaged DNA. We further demonstrate that the preference of LAP2α-promoted RPA loading on damaged chromatin depends on poly ADP-ribose polymerase PARP1, but not poly(ADP-ribosyl)ation. Our study provides mechanistic insight into RPA deposition in response to DNA damage and reveals a genome protection role of LAP2α. The online version contains supplementary material available at 10.1186/s13059-022-02638-6.
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