Tex14, a Plk1-regulated protein, is required for kinetochore-microtubule attachment and regulation of the spindle assembly checkpoint.

Tex14, a Plk1-regulated protein, is required for kinetochore-microtubule attachment and regulation of the spindle assembly checkpoint.
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DOI:
10.1016/j.molcel.2012.01.013
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发表时间:
2012-03-09
期刊:
影响因子:
16
通讯作者:
Couch FJ
Couch FJ
中科院分区:
生物学1区
文献类型:
--
作者:
Mondal G;Ohashi A;Yang L;Rowley M;Couch FJ

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在有丝分裂过程中,着丝粒(KT)的正确组装是纺锤体微管(MT)的双极附着和纺锤体组装检查点(SAC)组分积累所必需的。在这里,我们表明,睾丸表达的蛋白14(Tex 14),这已牵连在中间体功能,被招募到KT由Plk 1在Cdk 1依赖的方式在早期有丝分裂。从着丝粒中排除Tex 14导致不能有效地定位外部KT组分,受损的KT-MT附着,染色体congression缺陷和整个染色体不稳定。此外,我们表明,磷酸化的Tex 14 Plk 1在中期促进APCCdc 20介导的Tex 14降解。这种磷酸化事件的抑制会导致Tex 14在KT处的保留,并导致延迟的中期到后期转换和染色体分离缺陷。我们的研究结果确定Tex 14作为KT结构和功能的重要介质和染色体分离的保真度。
Proper assembly of kinetochores (KTs) during mitosis is required for bipolar attachment of spindle microtubules (MTs) and the accumulation of spindle assembly checkpoint (SAC) components. Here we show that testis expressed protein 14 (Tex14), which has been implicated in midbody function, is recruited to KTs by Plk1 in a Cdk1-dependent manner during early mitosis. Exclusion of Tex14 from kinetochores results in an inability to efficiently localize outer KT components, impaired KT-MT attachment, chromosome congression defects and whole chromosome instability. In addition, we demonstrate that phosphorylation of Tex14 by Plk1 during metaphase promotes APCCdc20-mediated Tex14 degradation. Inhibition of this phosphorylation event causes retention of Tex14 at KTs and results in delayed metaphase to anaphase transition and chromosome segregation defects. Our findings identify Tex14 as an important mediator of KT structure and function and the fidelity of chromosome separation.
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