Regulation of Claspin by the p38 stress-activated protein kinase protects cells from DNA damage.

Regulation of Claspin by the p38 stress-activated protein kinase protects cells from DNA damage.
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p38 应激激活蛋白激酶对 Claspin 的调节可保护细胞免受 DNA 损伤。

DOI:
10.1016/j.celrep.2022.111375
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发表时间:
2022
期刊:
影响因子:
8.8
通讯作者:
F. Posas
F. Posas
中科院分区:
生物学1区
文献类型:
--
作者:
Arnau Ulsamer;A. Martínez;Sina Bader;Sara Rodríguez;R. Freire;J. Méndez;Eulàlia de Nadal;F. Posas

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应激激活蛋白激酶(SAPKs)增强生存对环境变化的反应。在酵母中,Hog 1 SAPK和Mrc 1(DNA复制所需的蛋白质)定义了一种保护机制,允许真核细胞在S期应激时防止基因组不稳定。在这里,我们表明,在哺乳动物中,p38 SAPK和Claspin-Mrc 1的功能同源物-保护细胞免受DNA损伤后,在S-期应激。我们证明了p38磷酸化Claspin,并且Claspin中p38磷酸化位点的突变或p38抑制Claspin对DNA损伤的保护作用。此外,野生型Claspin而不是p38-非磷酸化突变体对顺铂处理后的细胞存活具有保护作用。这些发现揭示了Claspin在响应化疗药物中的作用。因此,该途径保护S期完整性免受不同的损伤,并且从酵母到哺乳动物都是保守的。
Stress-activated protein kinases (SAPKs) enhance survival in response to environmental changes. In yeast, the Hog1 SAPK and Mrc1, a protein required for DNA replication, define a safeguard mechanism that allows eukaryotic cells to prevent genomic instability upon stress during S-phase. Here we show that, in mammals, the p38 SAPK and Claspin—the functional homolog of Mrc1—protect cells from DNA damage upon osmostress during S-phase. We demonstrate that p38 phosphorylates Claspin and either the mutation of the p38-phosphorylation sites in Claspin or p38 inhibition suppresses the protective role of Claspin on DNA damage. In addition, wild-type Claspin but not the p38-unphosphorylatable mutant has a protective effect on cell survival in response to cisplatin treatment. These findings reveal a role of Claspin in response to chemotherapeutic drugs. Thus, this pathway protects S-phase integrity from different insults and it is conserved from yeast to mammals.
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