Pten regulates spindle pole movement through Dlg1-mediated recruitment of Eg5 to centrosomes.

Pten regulates spindle pole movement through Dlg1-mediated recruitment of Eg5 to centrosomes.
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DOI:
10.1038/ncb3369
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发表时间:
2016-07
影响因子:
21.3
通讯作者:
van Deursen, Jan M.
van Deursen, Jan M.
中科院分区:
生物学1区
文献类型:
--
作者:
van Ree, Janine H.;Nam, Hyun-Ja;Jeganathan, Karthik B.;Kanakkanthara, Arun;van Deursen, Jan M.

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磷酸酶和张力蛋白同源物(Pten)通过其磷酸酶活性负性调节PI(3)K信号传导抑制肿瘤生长。为了深入了解非催化Pten结构域在正常生理过程和肿瘤发生中的作用,我们设计了缺乏PDZ结合结构域(PDZ-BD)的小鼠。在这里,我们表明,PDZ-BD调节中心体运动,其杂合或纯合缺失促进非整倍体和肿瘤形成。我们发现Pten以Plk 1依赖的方式被招募到有丝分裂前中心体,为含有PDZ结构域的蛋白Dlg 1(也称为Sap 97)和Eg 5(也称为Kif 11)的蛋白复合物创建对接位点,Eg 5是中心体运动和双极纺锤体形成所必需的驱动蛋白。Dlg 1-Eg 5复合物与Pten的对接依赖于Nek 9-Nek 6有丝分裂激酶级联和Cdk 1对Eg 5的磷酸化。PDZ-BD缺失或Dlg 1消融损害了Eg 5到中心体的负载和纺锤体极运动,产生不对称的纺锤体,容易发生染色体误分离。总的来说,这些数据表明,Pten,通过其PDZ-BD的Dlg 1结合能力,在重复的中心体积累磷酸化Eg 5,以建立对称的双极纺锤体,正确分离染色体,并表明这种功能有助于肿瘤抑制。
Phosphatase and tensin homologue (Pten) suppresses neoplastic growth by negatively regulating PI(3)K signalling through its phosphatase activity. To gain insight into the actions of non-catalytic Pten domains in normal physiological processes and tumorigenesis, we engineered mice lacking the PDZ-binding domain (PDZ-BD). Here, we show that the PDZ-BD regulates centrosome movement and that its heterozygous or homozygous deletion promotes aneuploidy and tumour formation. We found that Pten is recruited to pre-mitotic centrosomes in a Plk1-dependent fashion to create a docking site for protein complexes containing the PDZ-domain-containing protein Dlg1 (also known as Sap97) and Eg5 (also known as Kif11), a kinesin essential for centrosome movement and bipolar spindle formation. Docking of Dlg1–Eg5 complexes to Pten depended on Eg5 phosphorylation by the Nek9–Nek6 mitotic kinase cascade and Cdk1. PDZ-BD deletion or Dlg1 ablation impaired loading of Eg5 onto centrosomes and spindle pole motility, yielding asymmetrical spindles that are prone to chromosome missegregation. Collectively, these data demonstrate that Pten, through the Dlg1-binding ability of its PDZ-BD, accumulates phosphorylated Eg5 at duplicated centrosomes to establish symmetrical bipolar spindles that properly segregate chromosomes, and suggest that this function contributes to tumour suppression.
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