A biphasic pulling force acts on transmembrane helices during translocon-mediated membrane integration.

A biphasic pulling force acts on transmembrane helices during translocon-mediated membrane integration.
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DOI:
10.1038/nsmb.2376
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发表时间:
2012-10
影响因子:
16.8
通讯作者:
von Heijne, Gunnar
von Heijne, Gunnar
中科院分区:
生物学1区
文献类型:
--
作者:
Ismail, Nurzian;Hedman, Rickard;Schiller, Nina;von Heijne, Gunnar

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用于插入细菌内膜或真核细胞内质网膜的膜蛋白由结合于细菌SecYEG或同源真核Sec 61易位子的核糖体合成。在共翻译膜整合过程中,新生链中的跨膜α-螺旋片段通过向周围膜打开的侧向门离开易位子,但侧向出口的机制尚不清楚。特别是,很少有人知道如何跨膜螺旋行为时,进入和退出的易位子。使用细菌SecM蛋白和哺乳动物Xbp 1蛋白作为力传感器的抑制-逮捕肽,我们表明,大量的力施加在跨膜螺旋在两个不同的点,在其过境通过translocon通道,提供直接洞察膜整合的动态。
Membrane proteins destined for insertion into the inner membrane of bacteria or the endoplasmic reticulum membrane in eukaryotic cells are synthesized by ribosomes bound to the bacterial SecYEG or the homologous eukaryotic Sec61 translocon. During co-translational membrane integration, transmembrane α-helical segments in the nascent chain exit the translocon via a lateral gate that opens towards the surrounding membrane, but the mechanism of lateral exit is not well understood. In particular, little is known about how a transmembrane helix behaves when entering and exiting the translocon. Using translation-arrest peptides from bacterial SecM proteins and from the mammalian Xbp1 protein as force sensors, we show that substantial force is exerted on a transmembrane helix at two distinct points during its transit through the translocon channel, providing direct insight into the dynamics of membrane integration.
内部信号和信号锚定序列的COOH末端在ER转运酶中的位置不同。
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