Torsin mediates primary envelopment of large ribonucleoprotein granules at the nuclear envelope.

Torsin mediates primary envelopment of large ribonucleoprotein granules at the nuclear envelope.
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Torsin介导了核包膜上大型核糖核蛋白颗粒的一级包膜。

DOI:
10.1016/j.celrep.2013.03.015
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发表时间:
2013-04-25
期刊:
影响因子:
8.8
通讯作者:
Budnik V
Budnik V
中科院分区:
生物学1区
文献类型:
--
作者:
Jokhi V;Ashley J;Nunnari J;Noma A;Ito N;Wakabayashi-Ito N;Moore MJ;Budnik V

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大核糖核蛋白(megaRNP)颗粒离开细胞核的机制是通过核膜(NE)出芽。这种机制类似于疱疹型病毒的核出口,对突触的正常发育至关重要。然而,在此过程中改造NE所需的分子机制尚不清楚。在这里,我们确定了Torsin,一种与肌张力障碍有关的人类aaa - atp酶,作为ne -出芽期间原发性megaRNP包膜的主要介质。在torsin突变体中,megaRNPs在核周空间内积累,其中包含的mrna无法到达突触位点,从而阻止了正常的突触蛋白合成,从而阻碍了正常的突触键发育。这些研究开始建立megaRNPs通过出芽退出的细胞机制,为肌张力障碍模型中发现的“核泡”表型提供了解释,并提供了肌张力障碍中观察到的Torsin和突触表型之间的重要联系。
A previously unrecognized mechanism by which large ribonucleoprotein (megaRNP) granules exit the nucleus is by budding through the nuclear envelope (NE). This mechanism is akin to the nuclear egress of Herpes-type viruses and is essential for proper synapse development. However, the molecular machinery required to remodel the NE during this process is unknown. Here we identify Torsin, a AAA-ATPase that in humans is linked to dystonia, as a major mediator of primary megaRNP envelopment during NE-budding. In torsin mutants, megaRNPs accumulate within the perinuclear space and the mRNAs contained within fail to reach synaptic sites, preventing normal synaptic protein synthesis, and thus proper synaptic bouton development. These studies begin to establish the cellular machinery underlying the exit of megaRNPs via budding, offer an explanation to the “nuclear blebbing” phenotype found in dystonia models and provide an important link between Torsin and synaptic phenotypes observed in dystonia.
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