PinX1 is recruited to the mitotic chromosome periphery by Nucleolin and facilitates chromosome congression.

PinX1 is recruited to the mitotic chromosome periphery by Nucleolin and facilitates chromosome congression.
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DOI:
10.1016/j.bbrc.2009.04.077
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发表时间:
2009-06-19
影响因子:
3.1
通讯作者:
Yao X
Yao X
中科院分区:
生物学4区
文献类型:
--
作者:
Li N;Yuan K;Yan F;Huo Y;Zhu T;Liu X;Guo Z;Yao X

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有丝分裂的染色体运动是由纺锤体微管和染色体之间的相互作用协调的。众所周知,着丝点是微管-染色体附着发生的主要位点。然而,染色体的其他结构域如染色体外周的功能仍不清楚。我们之前的研究表明,PinX1在有丝分裂时分布于染色体外周和着丝点,并具有微管结合活性。在这里,我们报道PinX1通过其c -末端与染色体外周蛋白Nucleolin相互作用。反褶积显微镜分析显示,PinX1在染色体前期主要与核仁蛋白共定位于染色体外围。此外,Nucleolin的缺失会消除PinX1的染色体外周定位,这表明PinX1和Nucleolin之间存在功能上的相互关系。重要的是,PinX1和Nucleolin的抑制消除了实时有丝分裂中的染色体分离,验证了PinX1 - Nucleolin相互作用的功能重要性。我们认为PinX1是通过核仁蛋白募集到染色体外围的,PinX1和核仁蛋白的复合体对于染色体的忠实集会是必不可少的。
Mitotic chromosome movements are orchestrated by interactions between spindle microtubules and chromosomes. It is well known that kinetochore is the major site where microtubule-chromosome attachment occurs. However, the functions of other domains of chromosome such as chromosome periphery have remained elusive. Our previous studies show that PinX1 distributes to chromosome periphery and kinetochore during mitosis, and harbors the microtubule binding activity. Here we report that PinX1 interacts with Nucleolin, a chromosome periphery protein, through its C-termini. Deconvolution microscopic analyses show PinX1 mainly co-localizes with Nucleolin at chromosome periphery in prometaphase. Moreover, depletion of Nucleolin abolishes chromosome periphery localizations of PinX1, suggesting a functional interrelationship between PinX1 and Nucleolin. Importantly, repression of PinX1 and Nucleolin abrogates chromosome segregation in real-time mitosis, validating the functional importance of PinX1–Nucleolin interaction. We propose PinX1 is recruited to chromosome periphery by Nucleolin and a complex of PinX1 and Nucleolin is essential for faithful chromosome congression.
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