Microtubule organization by the antagonistic mitotic motors kinesin-5 and kinesin-14.

Microtubule organization by the antagonistic mitotic motors kinesin-5 and kinesin-14.
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DOI:
10.1083/jcb.200910125
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发表时间:
2010-05-03
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Surrey T
Surrey T
中科院分区:
其他
文献类型:
--
作者:
Hentrich C;Surrey T

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极间微管的分类是由拮抗分子马达产生的方向不稳定性,而不是力的稳定平衡。在细胞分裂过程中,不同的分子马达协同作用,重新排列微管。负端定向电机被认为具有双重作用:聚焦微管两端的极点,并与正端定向电机一起建立纺锤体中反平行微管之间的力平衡。我们在这里研究非洲爪蟾驱动蛋白-14和-5在体外的情况下,这些电机具有相反的方向性交联和滑动微管的竞争行动。我们发现,全长驱动蛋白-14可以形成微管星形细胞没有额外的因素,而驱动蛋白-5没有,可能反映了适应有丝分裂功能。一个稳定的力的平衡是没有建立在两个反平行的微管与这些电机。相反,产生方向不稳定性,促进有效的马达和微管分选。非运动微管交联剂可以抑制方向不稳定性,但也阻碍微管分选,说明组织的稳定性和动态性之间的冲突。这些结果建立了这些拮抗性有丝分裂马达和微管微泡的基本组织特性。
Interpolar microtubules are sorted by the directional instability resulting from antagonistic molecular motors, not a stable balance of force. During cell division, different molecular motors act synergistically to rearrange microtubules. Minus end–directed motors are thought to have a dual role: focusing microtubule ends to poles and establishing together with plus end–directed motors a balance of force between antiparallel microtubules in the spindle. We study here the competing action of Xenopus laevis kinesin-14 and -5 in vitro in situations in which these motors with opposite directionality cross-link and slide microtubules. We find that full-length kinesin-14 can form microtubule asters without additional factors, whereas kinesin-5 does not, likely reflecting an adaptation to mitotic function. A stable balance of force is not established between two antiparallel microtubules with these motors. Instead, directional instability is generated, promoting efficient motor and microtubule sorting. A nonmotor microtubule cross-linker can suppress directional instability but also impedes microtubule sorting, illustrating a conflict between stability and dynamicity of organization. These results establish the basic organizational properties of these antagonistic mitotic motors and a microtubule bundler.
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