Structure and gating of the nuclear pore complex.

Structure and gating of the nuclear pore complex.
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DOI:
10.1038/ncomms8532
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发表时间:
2015-06-26
影响因子:
16.6
通讯作者:
Medalia, Ohad
Medalia, Ohad
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Eibauer, Matthias;Pellanda, Mauro;Turgay, Yagmur;Dubrovsky, Anna;Wild, Annik;Medalia, Ohad

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核孔复合体(NPCs)贯穿核膜,使大分子能够在细胞核和细胞质之间进行交换。为了更深入地了解这种运输机制,我们通过低温电子断层扫描结合亚断层平均技术,从非洲爪蟾卵母细胞的天然核膜重建核孔复合体支架和通透性屏障结构,分辨率高达20 Å。除了分辨核孔复合体组成成分的单个蛋白质结构域之外,我们还提出了其中心通道处分子门结构的模型。此外,我们将这种天然核孔复合体结构与一种运输活性降低的结构进行比较和对比,并揭示了核孔复合体门的空间特性。 核孔复合体是大型大分子组装体,介导细胞核和细胞质之间的分子交换。在此,作者展示了处于不同运输状态的非洲爪蟾核孔复合体约20 Å的低温电子显微镜结构,以提出核孔复合体中心通道内分子门结构的模型。
Nuclear pore complexes (NPCs) perforate the nuclear envelope and allow the exchange of macromolecules between the nucleus and the cytoplasm. To acquire a deeper understanding of this transport mechanism, we analyse the structure of the NPC scaffold and permeability barrier, by reconstructing the Xenopus laevis oocyte NPC from native nuclear envelopes up to 20 Å resolution by cryo-electron tomography in conjunction with subtomogram averaging. In addition to resolving individual protein domains of the NPC constituents, we propose a model for the architecture of the molecular gate at its central channel. Furthermore, we compare and contrast this native NPC structure to one that exhibits reduced transport activity and unveil the spatial properties of the NPC gate. Nuclear pore complexes (NPCs) are large macromolecular assemblies that mediate the exchange of molecules between the nucleus and cytoplasm. Here the authors present a ∼20 Å cryo-EM structure of the X. laevis NPC in different states of transport to propose a model for the architecture of the NPC's molecular gate within its central channel.
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