Single copies of Sec61 and TRAP associate with a nontranslating mammalian ribosome.

Single copies of Sec61 and TRAP associate with a nontranslating mammalian ribosome.
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Sec61和陷阱的单副本与非翻译哺乳动物核糖体相关。

DOI:
10.1016/j.str.2008.05.003
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发表时间:
2008-07
期刊:
影响因子:
5.7
通讯作者:
Akey, Christopher W.
Akey, Christopher W.
中科院分区:
生物学2区
文献类型:
--
作者:
Menetret, Jean-Francois;Hegde, Ramanujan S.;Aguiar, Mike;Gygi, Steven P.;Park, Eunyong;Rapoport, Tom A.;Akey, Christopher W.

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在共翻译蛋白质易位过程中,核糖体与由Sec61复合物形成的膜通道相结合,并募集易位子相关蛋白复合物(TRAP)。在此,我们报道了来自哺乳动物内质网的核糖体 - 通道复合物的结构,其中该通道已在11Å分辨率下被可视化。在该复合物中,Sec61和TRAP的单拷贝与一个非翻译核糖体相关联,并且这种化学计量关系通过定量质谱法得到了验证。一种类似双层的密度围绕着通道,可归因于脂质和去污剂。然后将Sec61复合物的一种古菌同源物的晶体结构对接到图谱中。在该模型中,Sec61的两个细胞质环可能与RNA螺旋H6、H7和H50相互作用,而中央孔位于核糖体隧道出口下方。因此,这个Sec61拷贝处于能够捕获和易位新生链的位置。最后,我们表明哺乳动物和细菌的核糖体 - 通道复合物具有相似的结构。
During co-translational protein translocation, the ribosome associates with a membrane channel, formed by the Sec61 complex, and recruits the translocon-associated protein complex (TRAP). Here, we report the structure of a ribosome-channel complex from mammalian endoplasmic reticulum in which the channel has been visualized at 11Å resolution. In this complex, single copies of Sec61 and TRAP associate with a non-translating ribosome and this stoichiometry was verified by quantitative mass spectrometry. A bilayer-like density surrounds the channel and can be attributed to lipid and detergent. The crystal structure of an archaeal homolog of the Sec61 complex was then docked into the map. In this model, two cytoplasmic loops of Sec61 may interact with RNA helices H6, H7 and H50, while the central pore is located below the ribosome tunnel exit. Hence, this copy of Sec61 is positioned to capture and translocate the nascent chain. Finally, we show that mammalian and bacterial ribosome-channel complexes have similar architectures.
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