Pom121 links two essential subcomplexes of the nuclear pore complex core to the membrane.

Pom121 links two essential subcomplexes of the nuclear pore complex core to the membrane.
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DOI:
10.1083/jcb.201007098
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发表时间:
2010-11-01
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Wozniak RW
Wozniak RW
中科院分区:
其他
文献类型:
--
作者:
Mitchell JM;Mansfeld J;Capitanio J;Kutay U;Wozniak RW

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Pom121通过结合Nup155和Nup160的β-螺旋桨结构域将NPC的核心结构锚定在膜上。核孔复合物(NPCs)控制着分子在核膜(NE)上的运动。我们研究了存在于NPC支架和孔膜之间界面的分子相互作用。我们发现在哺乳动物细胞中介导这些相互作用的关键参与者是核孔蛋白Nup155和Nup160。Nup155的缺失大量改变了NE结构,导致NPC数量急剧减少,膜蛋白不正确地靶向内膜。Nup155在组装中的作用可能与膜上的事件密切相关,因为我们发现Nup155与孔膜蛋白Pom121和NDC1相互作用。此外,我们证明了Pom121的N端直接结合了Nup155和Nup160的β-螺旋桨区域。我们提出了一个模型,预测Pom121与Nup155和Nup160的相互作用有助于核孔的形成和NPC在孔膜上的锚定。
Pom121 anchors core structures of the NPC to the membrane through its binding to the β-propeller domains of Nup155 and Nup160. Nuclear pore complexes (NPCs) control the movement of molecules across the nuclear envelope (NE). We investigated the molecular interactions that exist at the interface between the NPC scaffold and the pore membrane. We show that key players mediating these interactions in mammalian cells are the nucleoporins Nup155 and Nup160. Nup155 depletion massively alters NE structure, causing a dramatic decrease in NPC numbers and the improper targeting of membrane proteins to the inner nuclear membrane. The role of Nup155 in assembly is likely closely linked to events at the membrane as we show that Nup155 interacts with pore membrane proteins Pom121 and NDC1. Furthermore, we demonstrate that the N terminus of Pom121 directly binds the β-propeller regions of Nup155 and Nup160. We propose a model in which the interactions of Pom121 with Nup155 and Nup160 are predicted to assist in the formation of the nuclear pore and the anchoring of the NPC to the pore membrane.
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