CENP-E combines a slow, processive motor and a flexible coiled coil to produce an essential motile kinetochore tether.

CENP-E combines a slow, processive motor and a flexible coiled coil to produce an essential motile kinetochore tether.
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DOI:
10.1083/jcb.200802189
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发表时间:
2008-05-05
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Cleveland DW
Cleveland DW
中科院分区:
其他
文献类型:
--
作者:
Kim Y;Heuser JE;Waterman CM;Cleveland DW

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有丝分裂驱动蛋白着丝粒蛋白 E (CENP-E) 是一种重要的着丝粒成分,直接有助于着丝粒捕获和稳定纺锤体微管。尽管 CENP-E 的减少会导致整个染色体错误分离率较高,但其作为微管依赖性马达的特性以及它如何促进着丝粒和微管之间的动态联系均未知。使用单分子测定,我们证明 CENP-E 是一种非常缓慢、高度加工的马达,可以长时间维持微管附着。全长非洲爪蟾 CENP-E 的直接可视化揭示了高度灵活的 230 nm 卷绕线圈,将其着丝粒结合域和运动域分开。我们还表明,全长 CENP-E 是一种慢速正端定向马达,其活性对于中期染色体排列至关重要。我们提出,CENP-E 的高度加工性微管依赖性运动活动可以为染色体会议提供动力,并提供灵活的活动系链,将着丝粒与动态纺锤体微管连接起来。
The mitotic kinesin centromere protein E (CENP-E) is an essential kinetochore component that directly contributes to the capture and stabilization of spindle microtubules by kinetochores. Although reduction in CENP-E leads to high rates of whole chromosome missegregation, neither its properties as a microtubule-dependent motor nor how it contributes to the dynamic linkage between kinetochores and microtubules is known. Using single-molecule assays, we demonstrate that CENP-E is a very slow, highly processive motor that maintains microtubule attachment for long periods. Direct visualization of full-length Xenopus laevis CENP-E reveals a highly flexible 230-nm coiled coil separating its kinetochore-binding and motor domains. We also show that full-length CENP-E is a slow plus end–directed motor whose activity is essential for metaphase chromosome alignment. We propose that the highly processive microtubule-dependent motor activity of CENP-E serves to power chromosome congression and provides a flexible, motile tether linking kinetochores to dynamic spindle microtubules.
DOI: 10.1016/s0092-8674(00)00070-2
发表时间: 2000-09-15
期刊: CELL
影响因子: 64.5
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影响因子: --
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