Dynamic autophosphorylation of mps1 kinase is required for faithful mitotic progression.

Dynamic autophosphorylation of mps1 kinase is required for faithful mitotic progression.
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mps1 激酶的动态自磷酸化是忠实有丝分裂进展所必需的。

DOI:
10.1371/journal.pone.0104723
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Dou Z
Dou Z
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Wang X;Yu H;Xu L;Zhu T;Zheng F;Fu C;Wang Z;Dou Z

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纺锤体组装检查点(SAC)是一种监测细胞周期进程的监督机制,从而确保准确的染色体分离。保守的有丝分裂激酶Mps 1是SAC的关键组分。人Mps 1在有丝分裂过程中表现出全面的磷酸化。然而,相关的生物学相关性在很大程度上是未知的。在这里,我们证明了8个自磷酸化位点内的N-末端的Mps 1,催化结构域外,参与调节Mps 1动粒定位。8个自磷酸化位点的磷酸模拟突变体损害Mps 1定位于动粒,并且还影响两个关键SAC效应子BubR 1和Mad 2的动粒募集,随后导致染色体分离错误。有趣的是,8个自磷酸化位点的非磷酸化突变体增强了Mps 1动粒定位并延迟后期开始。我们进一步表明,Mps 1磷酸化模拟和非磷酸化突变体不影响中期染色体congression。因此,我们的研究结果强调了Mps 1的动态自磷酸化在调节准确的染色体分离和确保正确的有丝分裂进程中的重要性。
The spindle assembly checkpoint (SAC) is a surveillance mechanism monitoring cell cycle progression, thus ensuring accurate chromosome segregation. The conserved mitotic kinase Mps1 is a key component of the SAC. The human Mps1 exhibits comprehensive phosphorylation during mitosis. However, the related biological relevance is largely unknown. Here, we demonstrate that 8 autophosphorylation sites within the N-terminus of Mps1, outside of the catalytic domain, are involved in regulating Mps1 kinetochore localization. The phospho-mimicking mutant of the 8 autophosphorylation sites impairs Mps1 localization to kinetochore and also affects the kinetochore recruitment of BubR1 and Mad2, two key SAC effectors, subsequently leading to chromosome segregation errors. Interestingly, the non-phosphorylatable mutant of the 8 autophosphorylation sites enhances Mps1 kinetochore localization and delays anaphase onset. We further show that the Mps1 phospho-mimicking and non-phosphorylatable mutants do not affect metaphase chromosome congression. Thus, our results highlight the importance of dynamic autophosphorylation of Mps1 in regulating accurate chromosome segregation and ensuring proper mitotic progression.
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