The Cdc14B-Cdh1-Plk1 axis controls the G2 DNA-damage-response checkpoint.

The Cdc14B-Cdh1-Plk1 axis controls the G2 DNA-damage-response checkpoint.
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DOI:
10.1016/j.cell.2008.05.043
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发表时间:
2008-07-25
期刊:
影响因子:
64.5
通讯作者:
Pagano, Michele
Pagano, Michele
中科院分区:
生物学1区
文献类型:
--
作者:
Bassermann, Florian;Frescas, David;Guardavaccaro, Daniele;Busino, Luca;Peschiaroli, Angelo;Pagano, Michele

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为了应对G2期的DNA损伤,哺乳动物细胞必须避免进入有丝分裂,而是启动DNA修复。在这里,我们表明,在响应G2的遗传毒性应激,磷酸酶Cdc 14 B从核仁易位到核质,并诱导泛素连接酶APC/CCDh 1的激活,随之而来的降解Plk 1,一个突出的有丝分裂激酶。这个过程诱导Claspin和Wee 1的稳定,因为这两种蛋白质的蛋白水解需要Plk 1的磷酸化,并允许有效的G2检查点。作为APC/CCDh 1在DNA损伤的G2细胞中再激活的副产物,Claspin是APC/CCDh 1在G1中的新底物,被靶向降解。然而,这一过程被去泛素化酶Usp 28抵消,从而允许Claspin介导的Chk 1活化以响应DNA损伤。这些发现定义了一种新的途径,对G2 DNA损伤反应检查点至关重要。
In response to DNA damage in G2, mammalian cells must avoid entry into mitosis and instead initiate DNA repair. Here we show that in response to genotoxic stress in G2, the phosphatase Cdc14B translocates from the nucleolus to the nucleoplasm and induces the activation of the ubiquitin ligase APC/CCdh1, with the consequent degradation of Plk1, a prominent mitotic kinase. This process induces the stabilization of Claspin and Wee1, as the proteolysis of these two proteins requires phosphorylation by Plk1, and allows an efficient G2 checkpoint. As a by-product of APC/CCdh1 reactivation in DNA-damaged G2 cells, Claspin, which we show to be a novel substrate of APC/CCdh1 in G1, is targeted for degradation. However, this process is counteracted by the deubiquitylating enzyme Usp28 to permit Claspin-mediated activation of Chk1 in response to DNA damage. These findings define a novel pathway that is crucial for the G2 DNA damage response checkpoint.
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