Components of the Hippo pathway cooperate with Nek2 kinase to regulate centrosome disjunction.

Components of the Hippo pathway cooperate with Nek2 kinase to regulate centrosome disjunction.
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DOI:
10.1038/ncb2120
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发表时间:
2010-12
影响因子:
21.3
通讯作者:
Schiebel, Elmar
Schiebel, Elmar
中科院分区:
生物学1区
文献类型:
--
作者:
Mardin, Balca R.;Lange, Cornelia;Baxter, Joanne E.;Hardy, Tara;Scholz, Sebastian R.;Fry, Andrew M.;Schiebel, Elmar

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在间期,中心体被一个延伸的蛋白质连接体连接在一起,该连接体连接母体和子体中心粒的近端。这种连接子在有丝分裂开始时被分解,这一过程被称为中心体分离,从而促进了中心体分离和两极纺锤体的形成。NIMA相关的激酶Nek2A参与了通过断开连接蛋白C-NAP1和ROOTOBELENT来断开中心体的连接。然而,控制中心体分离的机制仍然知之甚少。在这里,我们报道了河马途径的两个组成部分,哺乳动物不育的20-样蛋白2(Mst2)和支架蛋白萨尔瓦多(HSav1),它们直接与Nek2A相互作用,调节其定位到中心体的能力,并磷酸化C-NAP1和根公告。此外,我们还表明,hSav1-Mst2-Nek2A中心体分离通路在部分抑制kinesin-5 EG5的基础上成为形成双极纺锤体所必需的。我们认为hSav1-Mst2-Nek2A和EG5在中心体分离中具有不同但互补的功能。
During interphase centrosomes are held together by an extended proteinaceous linker that connects the proximal ends of the mother and daughter centriole. This linker is disassembled at the onset of mitosis in a process known as centrosome disjunction, thereby facilitating centrosome separation and bipolar spindle formation. The NIMA-related kinase Nek2A is implicated in disconnecting the centrosomes through disjoining the linker proteins C-Nap1 and rootletin. However, the mechanisms controlling centrosome disjunction remain poorly understood. Here, we report that two Hippo pathway components, the mammalian sterile 20-like kinase 2 (Mst2) and the scaffold protein Salvador (hSav1), directly interact with Nek2A regulating its ability to localize to centrosomes and phosphorylate C-Nap1 and rootletin. Furthermore, we show that the hSav1-Mst2-Nek2A centrosome disjunction pathway becomes essential for bipolar spindle formation upon partial inhibition of the kinesin-5 Eg5. We propose that hSav1-Mst2-Nek2A and Eg5 have distinct but complementary functions in centrosome disjunction.
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