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首页> 外文期刊>Current Biology: CB >Ndc80 Internal Loop Interacts with Dis1/TOG to Ensure Proper Kinetochore-Spindle Attachment in Fission Yeast
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Ndc80 Internal Loop Interacts with Dis1/TOG to Ensure Proper Kinetochore-Spindle Attachment in Fission Yeast

机译:Ndc80内部回路与Dis1 / TOG相互作用,以确保裂变酵母中适当的线粒体-主轴连接

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The Ndc80 complex, a conserved outer kinetochore complex, comprising four components (Ndc80/Hec1, Nuf2, Spc24, and Spc25), constitutes one of the core microtubule-binding sites within the kinetochore [[1], [2] and [3]]. Despite this knowledge, molecular mechanisms by which this complex contributes to establishment of correct bipolar attachment of the kinetochore to the spindle microtubule remain largely elusive [[1], [2], [4] and [5]]. Here we show that the conserved internal loop [[6] and [7]] of fission yeast Ndc80 directly binds the Dis1/TOG microtubule-associated protein [[8], [9] and [10]], thereby coupling spindle microtubule dynamics with kinetochore capture. Ndc80 loop mutant proteins fail to recruit Dis1 to kinetochores, imposing unstable attachment and frequent spindle collapse. In these mutants, mitotic progression is halted attributable to spindle assembly checkpoint activation, and chromosomes remain in the vicinity of the spindle poles without congression. dis1 deletion precisely phenocopies the loop mutants. Intriguingly, forced targeting of Dis1 to the Ndc80 complex rescues loop mutant's defects. We propose that Ndc80 comprises two microtubule-interacting interfaces: the N-terminal region directly binds the microtubule lattice, while the internal loop interacts with the plus end of microtubules via Dis1/TOG. Therefore, our results provide a crucial insight into how the Ndc80 complex establishes stable bipolar attachment to the spindle microtubule.
机译:Ndc80复合物是一个保守的外部动粒复合物,由四个成分(Ndc80 / Hec1,Nuf2,Spc24和Spc25)组成,构成了动粒复合物中的核心微管结合位点之一[[1],[2]和[3]。 ]。尽管有这些知识,但这种复合物有助于建立动粒体与纺锤体微管之间正确的双极连接的分子机制仍然难以捉摸[[1],[2],[4]和[5]。在这里,我们显示裂变酵母Ndc80的保守内环[[6]和[7]]直接与Dis1 / TOG微管相关蛋白[[8],[9]和[10]]结合,从而耦合纺锤体微管动力学与动线虫捕获。 Ndc80环突变蛋白未能将Dis1募集到动植物中,造成不稳定的附着和频繁的纺锤体崩溃。在这些突变体中,可归因于纺锤体装配检查点激活而停止了有丝分裂进程,并且染色体保留在纺锤体极点附近而无国会现象。 dis1删除精确表型环突变体。有趣的是,将Dis1强制靶向Ndc80复合物可以挽救环突变体的缺陷。我们建议Ndc80包括两个微管相互作用的接口:N末端区域直接绑定微管格,而内部回路通过Dis1 / TOG与微管的正端相互作用。因此,我们的结果为Ndc80复合物如何建立稳定的双极连接到纺锤体微管提供了至关重要的见解。

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