Structure of a eukaryotic cyclic-nucleotide-gated channel.
Structure of a eukaryotic cyclic-nucleotide-gated channel.
复制标题
真核环核苷酸门控通道的结构。
DOI:
10.1038/nature20819
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发表时间:
2017-02-02
期刊:
影响因子:
64.8
通讯作者:
Yang J
中科院分区:
文献类型:
--
作者:
Li M;Zhou X;Wang S;Michailidis I;Gong Y;Su D;Li H;Li X;Yang J
Cyclic nucleotide-gated (CNG) channels are essential for vision and olfaction. They belong to the voltage-gated ion channel superfamily but their activities are controlled by intracellular cyclic nucleotides instead of transmembrane voltage. Here we report a 3.5 Å-resolution single-particle electron cryomicroscopy structure of a CNG channel from C. elegans in the cGMP-bound open state. The channel has an unusual voltage-sensor-like domain (VSLD), accounting for its deficient voltage dependence. A C-terminal linker connecting S6 and the cyclic nucleotide-binding domain interacts directly with both the VSLD and pore domain, forming a gating ring that couples conformational changes triggered by cyclic nucleotide binding to the gate. The selectivity filter is lined by the carboxylate side chains of a functionally important glutamate and three rings of backbone carbonyls. This structure provides a new framework for understanding mechanisms of ion permeation, gating and channelopathy of CNG channels and cyclic nucleotide modulation of related channels.
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影响因子:
48
作者:
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通讯作者:
Cheng, Yifan
影响因子:
2.5
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Torre, Vincent
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通讯作者:
MacKinnon, R
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5.6
作者:
Altieri, Stephen L.;Clayton, Gina M.;Morais-Cabral, Joao H.
通讯作者:
Morais-Cabral, Joao H.