Cooperation of the Dam1 and Ndc80 kinetochore complexes enhances microtubule coupling and is regulated by aurora B.

Cooperation of the Dam1 and Ndc80 kinetochore complexes enhances microtubule coupling and is regulated by aurora B.
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DOI:
10.1083/jcb.200910142
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发表时间:
2010-05-17
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Davis TN
Davis TN
中科院分区:
其他
文献类型:
--
作者:
Tien JF;Umbreit NT;Gestaut DR;Franck AD;Cooper J;Wordeman L;Gonen T;Asbury CL;Davis TN

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由极光B磷酸化调节的Dam1复合体为Ndc80复合体在运动中心提供了更稳定的微管结合(另见Lampert等人的相关论文)。在本期中)。动粒与动态纺锤体微管的偶联对于染色体定位和分离、纠错和细胞周期进程至关重要。这些基本的附着体是如何制作的,并在主轴的拉力作用下保持不变,仍然是重要的问题。作为微管结合元件,发芽酵母NDC80和DAM1动粒复合体是必需的,并不是多余的,但它们的不同贡献尚不清楚。在这项研究中,我们证明了DAM1复合体是Ndc80复合体的一个处理因子,在体外增强了Ndc80复合体形成动态微管末端的承重附着和跟踪的能力。此外,当DAM1复合体被酵母极光B激酶Ipl1磷酸化时,Ndc80和Dam1复合体之间的相互作用被取消。这为极光B重置异常的动粒-微管连接的机制提供了证据。我们认为DAM1复合体在动粒-微管连接中作为加工因子的作用是由保守的信号调节的,以进行纠错。
The Dam1 complex, regulated by aurora B phosphorylation, confers a more stable microtubule association for the Ndc80 complex at kinetochores (see also related paper by Lampert et al. in this issue). The coupling of kinetochores to dynamic spindle microtubules is crucial for chromosome positioning and segregation, error correction, and cell cycle progression. How these fundamental attachments are made and persist under tensile forces from the spindle remain important questions. As microtubule-binding elements, the budding yeast Ndc80 and Dam1 kinetochore complexes are essential and not redundant, but their distinct contributions are unknown. In this study, we show that the Dam1 complex is a processivity factor for the Ndc80 complex, enhancing the ability of the Ndc80 complex to form load-bearing attachments to and track with dynamic microtubule tips in vitro. Moreover, the interaction between the Ndc80 and Dam1 complexes is abolished when the Dam1 complex is phosphorylated by the yeast aurora B kinase Ipl1. This provides evidence for a mechanism by which aurora B resets aberrant kinetochore–microtubule attachments. We propose that the action of the Dam1 complex as a processivity factor in kinetochore–microtubule attachment is regulated by conserved signals for error correction.
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