Intracellular complexes of the early-onset torsion dystonia-associated AAA+ ATPase TorsinA.

Intracellular complexes of the early-onset torsion dystonia-associated AAA+ ATPase TorsinA.
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DOI:
10.1186/2193-1801-3-743
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发表时间:
2014
期刊:
影响因子:
--
通讯作者:
Zolkiewski M
Zolkiewski M
中科院分区:
其他
文献类型:
--
作者:
Li H;Wu HC;Liu Z;Zacchi LF;Brodsky JL;Zolkiewski M

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编码torsinA的基因中的单个Gag密码子缺失与大多数早发性扭转肌张力障碍有关。TorsinA是一种内质网定位的膜相关ATPase,来自AAA+超家族,其生物学功能未知。我们研究了在培养的哺乳动物细胞中形成TorsinA寡聚体的过程,发现野生型TorsinA结合成一个与同型六聚体分子量一致的复合体。有趣的是,与野生型蛋白相比,肌张力障碍连锁变异体TorsinAΔE形成寡聚体的倾向降低。我们还发现,TorsinA的N-端膜结合区的缺失消除了寡聚体的形成。我们的结果表明,TorsinA基因的肌张力障碍连锁突变产生了一种蛋白质变体,该变体缺乏维持其寡聚状态的能力,并表明需要ER膜结合来稳定TorsinA复合体。本文的在线版本(DOI:10.1186/2193-1801-3-743)包含补充材料,可供授权用户使用。
A single GAG codon deletion in the gene encoding torsinA is linked to most cases of early-onset torsion dystonia. TorsinA is an ER-localized membrane-associated ATPase from the AAA+ superfamily with an unknown biological function. We investigated the formation of oligomeric complexes of torsinA in cultured mammalian cells and found that wild type torsinA associates into a complex with a molecular weight consistent with that of a homohexamer. Interestingly, the dystonia-linked variant torsinAΔE displayed a reduced propensity to form the oligomers compared to the wild type protein. We also discovered that the deletion of the N-terminal membrane-associating region of torsinA abolished oligomer formation. Our results demonstrate that the dystonia-linked mutation in the torsinA gene produces a protein variant that is deficient in maintaining its oligomeric state and suggest that ER membrane association is required to stabilize the torsinA complex. The online version of this article (doi:10.1186/2193-1801-3-743) contains supplementary material, which is available to authorized users.
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