Molecular architecture of the inner ring scaffold of the human nuclear pore complex.

Molecular architecture of the inner ring scaffold of the human nuclear pore complex.
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DOI:
10.1126/science.aaf0643
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发表时间:
2016-04-15
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Beck M
Beck M
中科院分区:
其他
文献类型:
--
作者:
Kosinski J;Mosalaganti S;von Appen A;Teimer R;DiGuilio AL;Wan W;Bui KH;Hagen WJ;Briggs JA;Glavy JS;Hurt E;Beck M

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核孔复合物(NPC)是介导核质转运的110兆道尔顿组装体。NPC是由大约30种不同核孔蛋白的多个拷贝构建的,了解这些核孔蛋白如何组装成NPC支架是一个巨大的挑战。最近,它已被证明如何Y复合物,一个突出的NPC模块,形成核孔的外环。然而,内圈的组织至今仍不为人知。我们使用分子建模结合交联质谱和低温电子断层扫描,以获得内环的复合结构。这个结构图解释了支架的绝大多数电子密度。我们的结论是,尽管在形态和组成上有明显的差异,但内环和外环的高阶结构出乎意料地相似。
Nuclear pore complexes (NPCs) are 110-megadalton assemblies that mediate nucleocytoplasmic transport. NPCs are built from multiple copies of ~30 different nucleoporins, and understanding how these nucleoporins assemble into the NPC scaffold imposes a formidable challenge. Recently, it has been shown how the Ycomplex, a prominent NPC module, forms the outer rings of the nuclear pore. However, the organization of the inner ring has remained unknown until now. We used molecular modeling combined with cross-linking mass spectrometry and cryo-electron tomography to obtain a composite structure of the inner ring. This architectural map explains the vast majority of the electron density of the scaffold. We conclude that despite obvious differences in morphology and composition, the higher-order structure of the inner and outer rings is unexpectedly similar.
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