Regulation of Sli15/INCENP, kinetochore, and Cdc14 phosphatase functions by the ribosome biogenesis protein Utp7.

Regulation of Sli15/INCENP, kinetochore, and Cdc14 phosphatase functions by the ribosome biogenesis protein Utp7.
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通过核糖体生物发生蛋白UTP7调节SLI15/INCENP,动力学和CDC14磷酸酶的功能。

DOI:
10.1083/jcb.200802085
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发表时间:
2008-09-22
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Chan CS
Chan CS
中科院分区:
其他
文献类型:
--
作者:
Jwa M;Kim JH;Chan CS

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Sli 15-Ipl 1-Bir 1染色体乘客复合物对于芽殖酵母Saccharomycescerevisiae中适当的着丝粒微管附着和纺锤体稳定性是必不可少的。在分裂后期早期,Cdc 14蛋白磷酸酶从核仁释放导致Sli 15的去磷酸化,并将该复合物从动粒重新分配到纺锤体。我们在这里表明,主要是核仁核糖体生物发生蛋白Utp 7也存在于着丝粒,并需要正常组织的着丝粒蛋白和适当的染色体分离。Utp 7与Sli 15和Cdc 14相关并调节其定位。在分裂后期开始之前,它阻止了Cdc 14在核仁中的过早释放和Sli 15在纺锤体上的过早聚集。此外,Utp 7可以调节Sli 15的定位和磷酸化状态,而不依赖于其对Cdc 14功能的影响。因此,Utp 7是一种多功能蛋白,在核糖体生物发生、染色体分离和细胞周期控制的重要细胞过程中发挥重要作用。
The Sli15–Ipl1–Bir1 chromosomal passenger complex is essential for proper kinetochore–microtubule attachment and spindle stability in the budding yeast Saccharomyces cerevisiae. During early anaphase, release of the Cdc14 protein phosphatase from the nucleolus leads to the dephosphorylation of Sli15 and redistribution of this complex from kinetochores to the spindle. We show here that the predominantly nucleolar ribosome biogenesis protein Utp7 is also present at kinetochores and is required for normal organization of kinetochore proteins and proper chromosome segregation. Utp7 associates with and regulates the localization of Sli15 and Cdc14. Before anaphase onset, it prevents the premature nucleolar release of Cdc14 and the premature concentration of Sli15 on the spindle. Furthermore, Utp7 can regulate the localization and phosphorylation status of Sli15 independent of its effect on Cdc14 function. Thus, Utp7 is a multifunctional protein that plays essential roles in the vital cellular processes of ribosome biogenesis, chromosome segregation, and cell cycle control.
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