Cdc14-regulated midzone assembly controls anaphase B.

Cdc14-regulated midzone assembly controls anaphase B.
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DOI:
10.1083/jcb.200702145
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发表时间:
2007-06-18
影响因子:
7.8
通讯作者:
Schiebel, Elmar
Schiebel, Elmar
中科院分区:
生物学1区
文献类型:
--
作者:
Khmelinskii, Anton;Lawrence, Clare;Roostalu, Johanna;Schiebel, Elmar

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有丝分裂后期纺锤体的伸长是一个细胞周期调控的过程,它需要微管(MTs)的聚合、交联和滑动之间的协调。在纺锤体中区组装的蛋白质可能对这一过程很重要。在这项研究中,我们表明Ase1和分离酶 - Slk19复合物驱动酵母中的中区组装。保守的微管捆绑蛋白Ase1建立了一个中区,而分离酶 - Slk19是聚焦和使中区成分居中所必需的。导致纺锤体中区组装的一个重要步骤是在后期开始时蛋白磷酸酶Cdc14对Ase1进行去磷酸化。Ase1未能去磷酸化会使中区蛋白质错位,并延迟后期B较慢的第二阶段。相反,在表达非磷酸化Ase1的细胞中,后期纺锤体的延伸更快,并且纺锤体经常断裂。Cdc14还通过极光B激酶间接控制分离酶 - Slk19复合物。因此,Cdc14直接通过Ase1以及间接通过分离酶 - Slk19复合物来调控纺锤体中区的组装和功能。
Spindle elongation in anaphase of mitosis is a cell cycle–regulated process that requires coordination between polymerization, cross-linking, and sliding of microtubules (MTs). Proteins that assemble at the spindle midzone may be important for this process. In this study, we show that Ase1 and the separase–Slk19 complex drive midzone assembly in yeast. Whereas the conserved MT-bundling protein Ase1 establishes a midzone, separase–Slk19 is required to focus and center midzone components. An important step leading to spindle midzone assembly is the dephosphorylation of Ase1 by the protein phosphatase Cdc14 at the beginning of anaphase. Failure to dephosphorylate Ase1 delocalizes midzone proteins and delays the second, slower phase of anaphase B. In contrast, in cells expressing nonphosphorylated Ase1, anaphase spindle extension is faster, and spindles frequently break. Cdc14 also controls the separase–Slk19 complex indirectly via the Aurora B kinase. Thus, Cdc14 regulates spindle midzone assembly and function directly through Ase1 and indirectly via the separase–Slk19 complex.
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