Treslin collaborates with TopBP1 in triggering the initiation of DNA replication.

Treslin collaborates with TopBP1 in triggering the initiation of DNA replication.
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DOI:
10.1016/j.cell.2009.12.049
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发表时间:
2010-02-05
期刊:
影响因子:
64.5
通讯作者:
Dunphy WG
Dunphy WG
中科院分区:
生物学1区
文献类型:
--
作者:
Kumagai A;Shevchenko A;Shevchenko A;Dunphy WG

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TopBP1在脊椎动物的DNA复制和检查点调控中具有重要作用。我们已经在非洲爪哇卵提取液中发现了一种名为Treslin的蛋白质,它与TopBP1相关。鸡蛋提取物中Treslin的缺失强烈地抑制了染色体DNA的复制。特雷斯林与鸡蛋提取物中染色质的结合独立于TopBP1发生。然而,在没有Treslin的情况下,不能将启动子蛋白CDC45装载到染色质上。在DNA复制开始之前,Treslin以CDK2依赖的方式与TopBP1结合。从人类细胞中去除特雷斯林也会强烈地抑制DNA复制。综上所述,这些结果表明Treslin和TopBP1在CDK2介导的CDC45装载到复制起点上是合作的。因此,特雷斯林在脊椎动物DNA复制的启动过程中起着至关重要的作用。
TopBP1 has important roles in both DNA replication and checkpoint regulation in vertebrates. We have identified a protein called Treslin that associates with TopBP1 in Xenopus egg extracts. Depletion of Treslin from egg extracts strongly inhibits chromosomal DNA replication. Binding of Treslin to chromatin in egg extracts occurs independently of TopBP1. However, loading of the initiator protein Cdc45 onto chromatin cannot take place in the absence of Treslin. Prior to the initiation of DNA replication, Treslin associates with TopBP1 in a Cdk2-dependent manner. Ablation of Treslin from human cells also strongly inhibits DNA replication. Taken together, these results indicate that Treslin and TopBP1 collaborate in the Cdk2-mediated loading of Cdc45 onto replication origins. Thus, Treslin regulates a pivotal step in the initiation of DNA replication in vertebrates.
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