Cell cycle regulation of DNA double-strand break end resection by Cdk1-dependent Dna2 phosphorylation.

Cell cycle regulation of DNA double-strand break end resection by Cdk1-dependent Dna2 phosphorylation.
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DOI:
10.1038/nsmb.2105
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发表时间:
2011-08-14
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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DNA重组途径是细胞周期调节,以协调复制。细胞周期蛋白依赖性激酶(Cdk 1)促进DNA双链断裂(DSB)处的有效5 '-链切除,这是同源重组和损伤检查点激活的初始步骤。Mre 11-Rad 50-Xrs 2与Sae 2的复合物启动切除,而两种核酸酶Exo 1和Dna 2以及DNA解旋酶/拓扑异构酶复合物Sgs 1-Top3-Rmi 1在DSB处产生更长的ssDNA。使用酿酒酵母,我们提供的证据Cdk 1依赖性磷酸化的切除核酸酶Dna 2在Thr 4,Ser 17和Ser 237,刺激其招聘DSB,切除和随后的Mec 1依赖性磷酸化。招募不良的dna 2 T4 A S17 A S237 A和dna 2 ΔN248突变蛋白仅在存在Exo 1的情况下促进切除,这表明Dna 2和Exo 1依赖性切除途径之间存在串扰。
DNA recombination pathways are cell cycle regulated to coordinate with replication. Cyclin-dependent kinase (Cdk1) promotes efficient 5'-strand resection at DNA double strand breaks (DSBs), the initial step of homologous recombination and damage checkpoint activation. The Mre11–Rad50–Xrs2 complex with Sae2 initiates resection, whereas two nucleases, Exo1 and Dna2, and the DNA helicase/topoisomerase complex Sgs1–Top3–Rmi1 generate longer ssDNA at DSBs. Using Saccharomyces cerevisiae we provide evidence for Cdk1-dependent phosphorylation of the resection nuclease Dna2 at Thr4, Ser17 and Ser237 that stimulates its recruitment to DSBs, resection and subsequent Mec1-dependent phosphorylation. Poorly recruited dna2T4A S17A S237A and dna2ΔN248 mutant proteins promote resection only in the presence of Exo1, suggesting crosstalk between Dna2- and Exo1-dependent resection pathways.
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