ICIS and Aurora B coregulate the microtubule depolymerase Kif2a.

ICIS and Aurora B coregulate the microtubule depolymerase Kif2a.
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DOI:
10.1016/j.cub.2009.03.018
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发表时间:
2009-05-12
期刊:
Current biology : CB
影响因子:
--
通讯作者:
Stukenberg PT
Stukenberg PT
中科院分区:
其他
文献类型:
--
作者:
Knowlton AL;Vorozhko VV;Lan W;Gorbsky GJ;Stukenberg PT

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有丝分裂纺锤体中的运动蛋白在决定纺锤体形状、大小和双极性方面起着重要作用,尽管人们对这些运动蛋白在纺锤体不同位置的具体调控知之甚少。为了平衡纺锤体双极性所需的力,微管解聚运动蛋白受到严格调节。Aurora B激酶磷酸化激酶13家族微管解聚合酶Kif2a和MCAK(有丝分裂着丝粒相关激酶)的颈部区域,并抑制它们的解聚合酶活性。它们是如何重新激活的,以及这是如何在不同的着丝点纤维上独立控制的尚不清楚。我们发现,刺激相关解聚合酶MCAK的内着丝粒kin - 1刺激因子(ICIS)可以在Aurora B抑制后重新激活Kif2a。当将阻断ICIS激活Kif2a能力的抗体注射到细胞中时,就会产生单极纺锤体。这种表型是通过联合注射抗nuf2抗体来挽救的。我们对ICIS蛋白进行了结构-功能分析,发现ICIS的n端结合Aurora B及其调控因子INCENP和TD60,而中心区域结合MCAK, Kif2a和微管,表明ICIS具有支架功能。这些数据表明ICIS和CPC (Chromosomal Passenger Complex)调节Kif2a解聚合酶的活性。
Kinesins in the mitotic spindle play major roles in determining spindle shape, size, and bipolarity, although specific regulation of these kinesins at distinct locations on the spindle is poorly understood. To balance the forces that are required for spindle bipolarity, microtubule-depolymerizing kinesins are tightly regulated. Aurora B kinase phosphorylates the neck regions of the kinesin-13 family microtubule depolymerases Kif2a and MCAK (Mitotic Centromere Associated Kinesin), and inhibits their depolymerase activities. How they are reactivated, and how this is controlled independently on different kinetochore fibers is unknown. We show that Inner Centromere Kin-I Stimulator (ICIS), which stimulates the related depolymerase MCAK, can reactivate Kif2a after Aurora B inhibition. When antibodies that block the ability of ICIS to activate Kif2a are injected into cells, monopolar spindles are generated. This phenotype is rescued by co-injection of anti-Nuf2 antibodies. We have performed a structure-function analysis of the ICIS protein, and find that the N-terminus of ICIS binds Aurora B and its regulators INCENP and TD60, while a central region binds MCAK, Kif2a and microtubules, suggesting a scaffold function for ICIS. These data argue that ICIS and the CPC (Chromosomal Passenger Complex) regulate Kif2a depolymerase activity.
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