Kinesin-5 in Drosophila embryo mitosis: sliding filament or spindle matrix mechanism?

Kinesin-5 in Drosophila embryo mitosis: sliding filament or spindle matrix mechanism?
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DOI:
10.1002/cm.20349
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发表时间:
2009-08
影响因子:
--
通讯作者:
Scholey, Jonathan M.
Scholey, Jonathan M.
中科院分区:
其他
文献类型:
--
作者:
Scholey, Jonathan M.

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果蝇合胞体胚胎使用多个专为快速有丝分裂的星形有丝分裂纺锤体。同源四聚体驱动蛋白-5,KLP 61 F有助于该系统中有丝分裂的各个方面,所有这些都与其在纺锤体极上施加向外的力相一致。原则上,驱动蛋白-5可以通过(i)相对于静态纺锤体基质滑动微管(MT),减去末端引导,或(ii)交联并滑动分开相邻的反平行极间(ip)MT对来实现这一点。在这里,我严格审查纯化KLP 61 F的生物化学数据,其本地化和动态特性内纺锤体,和定量建模KLP 61 F的功能。虽然基于基质的机制可能在某些系统中起作用,但这项工作倾向于支持果蝇胚胎纺锤体中KLP 61 F作用的后一种“滑动丝”机制。
The Drosophila syncytial embryo uses multiple astral mitotic spindles that are specialized for rapid mitosis. The homotetrameric kinesin-5, KLP61F contributes to various aspects of mitosis in this system, all of which are consistent with it exerting outward forces on spindle poles. In principle, kinesin-5 could accomplish this by (i) sliding microtubules (MTs), minus end leading, relative to a static spindle matrix or (ii) crosslinking and sliding apart adjacent pairs of antiparallel interpolar (ip) MTs. Here, I critically review data on the biochemistry of purified KLP61F, its localization and dynamic properties within spindles, and quantitative modeling of KLP61F function. While a matrix-based mechanism may operate in some systems, the work tends to support the latter “sliding filament” mechanism for KLP61F action in Drosophila embryo spindles.
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