Microtubule minus end motors kinesin-14 and dynein drive nuclear congression in parallel pathways.

Microtubule minus end motors kinesin-14 and dynein drive nuclear congression in parallel pathways.
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微管负端电动机动力素14和动力蛋白在平行途径中驱动核国会。

DOI:
10.1083/jcb.201409087
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发表时间:
2015-04-13
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Tran PT
Tran PT
中科院分区:
其他
文献类型:
--
作者:
Scheffler K;Minnes R;Fraisier V;Paoletti A;Tran PT

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通过微流控室的长期成像显示,两个负末端定向马达,动力蛋白和Klp 2,在不同的亚细胞结构中平行工作,以促进有效的核聚集。微管(MT)和相关的马达在核迁移中起着核心作用,这对包括细胞分裂,极性和有性生殖在内的多种生物功能至关重要。在本文中,我们报告了一个双重机制的核大会在裂变酵母核接合后交配的单倍体细胞。使用微流控室进行长期成像,我们捕捉到了核聚集的精确时间,并确定了两个在这个过程中并行运行的负末端导向马达。与MT相关的驱动蛋白-14 Klp 2可以交联和滑动从两个核发出的反平行MT,而在纺锤体极体(SPB)处积累的动力蛋白可以拉动从相对SPB成核的MT。Klp 2依赖的核聚集以恒定的速度进行,而动力蛋白积累导致核速度随时间增加。令人惊讶的是,轻中间链Dli 1,而不是dynactin,是以前未知的功能所需的动力蛋白。我们得出结论,有效的核聚集取决于两个负端向马达的合作。
Long-term imaging via microfluidic chambers shows that two minus end–directed motors, dynein and Klp2, work in parallel at distinct subcellular structures to promote efficient nuclear congression. Microtubules (MTs) and associated motors play a central role in nuclear migration, which is crucial for diverse biological functions including cell division, polarity, and sexual reproduction. In this paper, we report a dual mechanism underlying nuclear congression during fission yeast karyogamy upon mating of haploid cells. Using microfluidic chambers for long-term imaging, we captured the precise timing of nuclear congression and identified two minus end–directed motors operating in parallel in this process. Kinesin-14 Klp2 associated with MTs may cross-link and slide antiparallel MTs emanating from the two nuclei, whereas dynein accumulating at spindle pole bodies (SPBs) may pull MTs nucleated from the opposite SPB. Klp2-dependent nuclear congression proceeds at constant speed, whereas dynein accumulation results in an increase of nuclear velocity over time. Surprisingly, the light intermediate chain Dli1, but not dynactin, is required for this previously unknown function of dynein. We conclude that efficient nuclear congression depends on the cooperation of two minus end–directed motors.
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