TPX2 regulates the localization and activity of Eg5 in the mammalian mitotic spindle.

TPX2 regulates the localization and activity of Eg5 in the mammalian mitotic spindle.
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DOI:
10.1083/jcb.201106149
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发表时间:
2011-10-03
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Wadsworth P
Wadsworth P
中科院分区:
其他
文献类型:
--
作者:
Ma N;Titus J;Gable A;Ross JL;Wadsworth P

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TPX 2通过增强Eg 5在微管上的积累和限制运动活性来促进有丝分裂纺锤体的形成。有丝分裂纺锤体组装需要许多纺锤体相关蛋白的调节活性。在哺乳动物细胞中,驱动蛋白-5马达Eg 5与纺锤体组装因子TPX 2相互作用,但这种相互作用如何有助于纺锤体的形成和功能尚未确定。使用细菌人工染色体技术,我们产生了表达缺乏Eg 5相互作用结构域的TPX 2的细胞。这些细胞中的纺锤体高度紊乱,具有多个纺锤体极。TPX 2-Eg 5的相互作用所需的动粒纤维的形成,并有助于Eg 5本地化的纺锤体微管,但不是纺锤体极。显微注射TPX 2的Eg 5结合结构域导致纺锤体伸长,表明Eg 5与TPX 2的相互作用降低了运动活性。与这种可能性相一致,我们发现TPX 2降低了依赖于Eg 5的微管滑动的速度,抑制了微管滑动,并导致微管上马达的积累。这些结果确立了TPX 2在调节有丝分裂马达Eg 5的位置和活性中的新功能。
TPX2 promotes mitotic spindle formation by enhancing Eg5 accumulation on microtubules and limiting motor activity. Mitotic spindle assembly requires the regulated activity of numerous spindle-associated proteins. In mammalian cells, the Kinesin-5 motor Eg5 interacts with the spindle assembly factor TPX2, but how this interaction contributes to spindle formation and function is not established. Using bacterial artificial chromosome technology, we generated cells expressing TPX2 lacking the Eg5 interaction domain. Spindles in these cells were highly disorganized with multiple spindle poles. The TPX2–Eg5 interaction was required for kinetochore fiber formation and contributed to Eg5 localization to spindle microtubules but not spindle poles. Microinjection of the Eg5-binding domain of TPX2 resulted in spindle elongation, indicating that the interaction of Eg5 with TPX2 reduces motor activity. Consistent with this possibility, we found that TPX2 reduced the velocity of Eg5-dependent microtubule gliding, inhibited microtubule sliding, and resulted in the accumulation of motor on microtubules. These results establish a novel function of TPX2 in regulating the location and activity of the mitotic motor Eg5.
人类TPX2是将极光-A激酶靶向纺锤体所必需的。
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