A kinesin-mediated mechanism that couples centrosomes to nuclei.

A kinesin-mediated mechanism that couples centrosomes to nuclei.
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DOI:
10.1007/s00018-012-1205-0
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发表时间:
2013-04
影响因子:
8
通讯作者:
Koonce, Michael P.
Koonce, Michael P.
中科院分区:
生物学1区
文献类型:
--
作者:
Tikhonenko, Irina;Magidson, Valentin;Graef, Ralph;Khodjakov, Alexey;Koonce, Michael P.

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M型驱动蛋白亚型Kif9最近被认为与维持盘基网柄藻中心体和细胞核之间的物理联系有关。然而,Kif9连接这两个细胞器的机制仍然不清楚。在这里,我们证明了Kif9蛋白定位于核膜,并集中在中心体附着点的区域。核锚定似乎通过位于羧基末端的专门的跨膜结构域介导。Kif9在体外结合测定中与微管相互作用并影响聚合物的末端解聚。这些结果表明,Kif9锚定在细胞核上,并产生一种拉力,将中心体卷向细胞核。这是驱动蛋白运动的一种新活性,对于细胞进入有丝分裂并确保多核环境中中心体与核的平价非常重要。
The M-type kinesin isoform, Kif9, has recently been implicated in maintaining a physical connection between the centrosome and nucleus in Dictyostelium discoideum. However, the mechanism by which Kif9 functions to link these two organelles remains obscure. Here we demonstrate that the Kif9 protein is localized to the nuclear envelope and is concentrated in the region underlying the centrosome point of attachment. Nuclear anchorage appears mediated through a specialized trans-membrane domain located in the carboxyl terminus. Kif9 interacts with microtubules in in vitro binding assays and effects an endwise depolymerization of the polymer. These results suggest a model whereby Kif9 is anchored to the nucleus and generates a pulling force that reels the centrosome up against the nucleus. This is a novel activity for a kinesin motor, one important for progression of cells into mitosis and to ensure centrosome-nuclear parity in a multinuclear environment.
DOI: 10.1083/jcb.201004118
发表时间: 2010-10-04
期刊: The Journal of cell biology
影响因子: --
作者:
Fridolfsson HN;Starr DA
通讯作者: Starr DA
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