Cnn1 inhibits the interactions between the KMN complexes of the yeast kinetochore.

Cnn1 inhibits the interactions between the KMN complexes of the yeast kinetochore.
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DOI:
10.1038/ncb2495
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发表时间:
2012-05-06
影响因子:
21.3
通讯作者:
--
中科院分区:
生物学1区
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着丝粒将复制的染色体附着在有丝分裂纺锤体上,并协调它们向子细胞的传递。着丝粒-纺锤体结合和染色体分离由多拷贝KNL 1 Spc 105、MIS 12 Mtw 1和NDC 80 Ndc 80复合物介导,这些复合物形成所谓的KMN网络。KMN-纺锤体附着由Aurora BIpl 1和MPS 1 Mps 1激酶调节。目前还不清楚是否存在其他机制支持KMN在细胞周期中的活性。使用芽殖酵母,我们表明,动粒蛋白Cnn 1定位到Ndc 80复合物的基础,并促进KMN网络的功能主管配置。Cnn 1通过抑制其复合物之间的相互作用以时空方式调节KMN活性。Cnn 1活性在后期达到峰值,并由Cdc 28、Mps 1和Ipl 1激酶驱动。
Kinetochores attach the replicated chromosomes to the mitotic spindle and orchestrate their transmission to the daughter cells. Kinetochore–spindle binding and chromosome segregation are mediated by the multi-copy KNL1Spc105, MIS12Mtw1 and NDC80Ndc80 complexes that form the so-called KMN network. KMN–spindle attachment is regulated by the Aurora BIpl1 and MPS1Mps1 kinases. It is unclear whether other mechanisms exist that support KMN activity during the cell cycle. Using budding yeast, we show that kinetochore protein Cnn1 localizes to the base of the Ndc80 complex and promotes a functionally competent configuration of the KMN network. Cnn1 regulates KMN activity in a spatiotemporal manner by inhibiting the interaction between its complexes. Cnn1 activity peaks in anaphase and is driven by the Cdc28, Mps1 and Ipl1 kinases.
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