The ATR-WEE1 kinase module inhibits the MAC complex to regulate replication stress response.

The ATR-WEE1 kinase module inhibits the MAC complex to regulate replication stress response.
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ATR-WEE1 激酶模块抑制 MAC 复合物来调节复制应激反应。

DOI:
10.1093/nar/gkaa1082
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发表时间:
2021-02-22
影响因子:
14.9
通讯作者:
Yan S
Yan S
中科院分区:
生物学2区
文献类型:
--
作者:
Wang L;Zhan L;Zhao Y;Huang Y;Wu C;Pan T;Qin Q;Xu Y;Deng Z;Li J;Hu H;Xue S;Yan S

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DNA损伤反应是维持基因组稳定性的基本机制。ATR-WEE 1激酶模块在响应复制应激中起着核心作用。虽然ATR-WEE 1通路在酵母和动物中已经得到了很好的研究,但ATR-WEE 1在植物中的功能仍不清楚。通过对拟南芥atr突变体的抑制基因的遗传筛选,我们发现,PRL 1(参与选择性剪接的进化保守MAC复合物的核心亚基)功能的丧失抑制了atr和wee 1对复制应激的超敏性。生物化学研究表明,WEE 1直接与PRL 1相互作用,并在丝氨酸145处磷酸化PRL 1,从而促进PRL 1泛素化和随后的降解。与遗传和生化数据一致,复制应激诱导包括CYCD 1;1和CYCD 3;1在内的细胞周期基因的内含子保留,其在wee 1中被废除,但在wee 1 prl 1中恢复。值得注意的是,共表达CYCD 1;1和CYCD 3;1的编码序列部分恢复了wee 1 prl 1中的根长度和HU响应。这些数据表明,ATR-WEE 1模块抑制MAC复合物,以调节复制应激反应。我们的研究发现PRL 1或MAC复合物是ATR-WEE 1模块的关键下游调节因子,并揭示了一种新的细胞周期控制机制。
DNA damage response is a fundamental mechanism to maintain genome stability. The ATR-WEE1 kinase module plays a central role in response to replication stress. Although the ATR-WEE1 pathway has been well studied in yeasts and animals, how ATR-WEE1 functions in plants remains unclear. Through a genetic screen for suppressors of the Arabidopsis atr mutant, we found that loss of function of PRL1, a core subunit of the evolutionarily conserved MAC complex involved in alternative splicing, suppresses the hypersensitivity of atr and wee1 to replication stress. Biochemical studies revealed that WEE1 directly interacts with and phosphorylates PRL1 at Serine 145, which promotes PRL1 ubiquitination and subsequent degradation. In line with the genetic and biochemical data, replication stress induces intron retention of cell cycle genes including CYCD1;1 and CYCD3;1, which is abolished in wee1 but restored in wee1 prl1. Remarkably, co-expressing the coding sequences of CYCD1;1 and CYCD3;1 partially restores the root length and HU response in wee1 prl1. These data suggested that the ATR-WEE1 module inhibits the MAC complex to regulate replication stress responses. Our study discovered PRL1 or the MAC complex as a key downstream regulator of the ATR-WEE1 module and revealed a novel cell cycle control mechanism.
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