Dynactin is required for transport initiation from the distal axon.

Dynactin is required for transport initiation from the distal axon.
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DOI:
10.1016/j.neuron.2012.02.025
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发表时间:
2012-04-26
期刊:
影响因子:
16.2
通讯作者:
Holzbaur EL
Holzbaur EL
中科院分区:
医学1区
文献类型:
--
作者:
Moughamian AJ;Holzbaur EL

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动力蛋白是负端导向的微管运动胞浆动力蛋白所必需的辅因子。Dynactin高度保守的CAP-Gly结构域中的突变会导致神经退行性疾病。在这里,我们证明了CAP-Gly结构域对于丰富初级神经元远端的动力蛋白是必要的。虽然CAP-Gly结构域不是沿着轴突持续运输所必需的,但我们发现,远端积累有助于从轴突顶端有效地启动逆行囊泡运输。CAP-Gly结构域中的神经退行性疾病突变阻止了dynactin的远端浓缩,从而抑制了逆行运输的启动。因此,我们提出了一个模型,在该模型中,远端动力蛋白是促进微管、动力蛋白马达和货物之间相互作用的关键媒介,从而有效地启动运输。CAP-Gly结构域的突变破坏了马达-货物复合体的形成,突显了可能导致神经退化的轴突运输的特定缺陷。
Dynactin is a required cofactor for the minus-end directed microtubule motor cytoplasmic dynein. Mutations within the highly conserved CAP-Gly domain of dynactin cause neurodegenerative disease. Here, we show that the CAP-Gly domain is necessary to enrich dynactin at the distal end of primary neurons. While the CAP-Gly domain is not required for sustained transport along the axon, we find that the distal accumulation facilitates the efficient initiation of retrograde vesicular transport from the neurite tip. Neurodegenerative disease mutations in the CAP-Gly domain prevent the distal enrichment of dynactin thereby inhibiting the initiation of retrograde transport. Thus, we propose a model in which distal dynactin is a key mediator in promoting the interaction between the microtubule, dynein motor and cargo for the efficient initiation of transport. Mutations in the CAP-Gly domain disrupt the formation of the motor-cargo complex, highlighting the specific defects in axonal transport that may lead to neurodegeneration.
细胞质动力蛋白在微管和神经丝的轴突转运中的作用。
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