Long-timescale dynamics and regulation of Sec-facilitated protein translocation.
Long-timescale dynamics and regulation of Sec-facilitated protein translocation.
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DOI：
10.1016/j.celrep.2012.08.039
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发表时间：
2012-10-25
期刊：
影响因子：
8.8
通讯作者：
Miller TF 3rd
中科院分区：
文献类型：
--
作者：
Zhang B;Miller TF 3rd
We present a coarse-grained modeling approach that spans the nanosecond- to minute-timescale dynamics of co-translational protein translocation. The method enables direct simulation of both integral membrane protein topogenesis and transmembrane domain (TM) stop-transfer efficiency. Simulations reveal multiple kinetic pathways for protein integration, including a mechanism in which the nascent protein undergoes slow-timescale reorientation, or flipping, in the confined environment of the translocon channel. Competition among these pathways gives rise to the experimentally observed dependence of protein topology on ribosomal translation rate and protein length. We further demonstrate that sigmoidal dependence of stop-transfer efficiency on TM hydrophobicity arises from local equilibration of the TM across the translocon lateral gate, and it is predicted that slowing ribosomal translation yields decreased stop-transfer efficiency in long proteins. This work reveals the balance between equilibrium and non-equilibrium processes in protein targeting, and it provides new insight into the molecular regulation of the Sec translocon.
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