Distinct cell cycle-dependent roles for dynactin and dynein at centrosomes.

Distinct cell cycle-dependent roles for dynactin and dynein at centrosomes.
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DOI:
10.1083/jcb.200203089
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发表时间:
2002-10-28
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Schroer TA
Schroer TA
中科院分区:
其他
文献类型:
--
作者:
Quintyne NJ;Schroer TA

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中心体动力蛋白是独立于动力蛋白的正常微管锚定和/或聚焦所必需的。动力蛋白在整个间期都存在于中心体中,但动力蛋白只在S期和G2期积累。阻断动力蛋白为基础的运动可阻止动力蛋白和动力蛋白向中心体募集,破坏中心体和微管阵列的稳定,干扰有丝分裂期间的细胞周期进程。中心体动力蛋白池的不稳定不会抑制动力蛋白为基础的运动或动力蛋白向中心体的募集,而是导致G1中心粒异常分离和延迟进入S期。中心体相关的动力蛋白亚基的正确平衡显然对满足细胞周期机制很重要,该机制在中心体复制之前监测中心体的完整性,并最终控制G1到S的转变。我们的研究结果表明,除了作为微管锚点的功能外,dynactin还有助于向中心体募集重要的细胞周期调节因子。
Centrosomal dynactin is required for normal microtubule anchoring and/or focusing independently of dynein. Dynactin is present at centrosomes throughout interphase, but dynein accumulates only during S and G2 phases. Blocking dynein-based motility prevents recruitment of dynactin and dynein to centrosomes and destabilizes both centrosomes and the microtubule array, interfering with cell cycle progression during mitosis. Destabilization of the centrosomal pool of dynactin does not inhibit dynein-based motility or dynein recruitment to centrosomes, but instead causes abnormal G1 centriole separation and delayed entry into S phase. The correct balance of centrosome-associated dynactin subunits is apparently important for satisfaction of the cell cycle mechanism that monitors centrosome integrity before centrosome duplication and ultimately governs the G1 to S transition. Our results suggest that, in addition to functioning as a microtubule anchor, dynactin contributes to the recruitment of important cell cycle regulators to centrosomes.
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