Structural basis for GABA(A) receptor potentiation by neurosteroids.
Structural basis for GABA(A) receptor potentiation by neurosteroids.
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DOI:
10.1038/nsmb.3484
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发表时间:
2017-11
影响因子:
16.8
通讯作者:
Aricescu AR
中科院分区:
文献类型:
--
作者:
Miller PS;Scott S;Masiulis S;De Colibus L;Pardon E;Steyaert J;Aricescu AR
Type-A γ-aminobutyric acid receptors (GABAARs) are the principal mediators of inhibitory neurotransmission in the human brain. Endogenous neurosteroids interact with GABAARs to regulate acute and chronic anxiety and are potent sedative, analgesic, anticonvulsant and anaesthetic agents. Their mode of binding, and mechanism of receptor potentiation remain, however, unknown. Here we report crystal structures of a chimeric GABAAR construct, in apo and pregnanolone-bound states. The neurosteroid-binding site is mechanically coupled to the helices lining the ion channel pore, and modulates the desensitization gate conformation. We demonstrate that the equivalent site is responsible for physiological, heteromeric, GABAAR potentiation and explain the contrasting modulatory properties of 3α versus 3β neurosteroid epimers. These results illustrate how peripheral lipid ligands can regulate the desensitization gate of GABAARs, a process of broad relevance to pentameric ligand-gated ion channels.
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影响因子:
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通讯作者:
Smart, Trevor G.
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Bracamontes, John R.;Li, Ping;Steinbach, Joe Henry
通讯作者:
Steinbach, Joe Henry
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作者:
Hosie, AM;Dunne, EL;Smart, TG
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Smart, TG
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Chen, Zi-Wei;Manion, Brad;Evers, Alex S.
通讯作者:
Evers, Alex S.
DOI:
10.1107/s0907444909052925
发表时间:
2010-02
期刊:
Acta crystallographica. Section D, Biological crystallography
影响因子:
--
作者:
Adams PD;Afonine PV;Bunkóczi G;Chen VB;Davis IW;Echols N;Headd JJ;Hung LW;Kapral GJ;Grosse-Kunstleve RW;McCoy AJ;Moriarty NW;Oeffner R;Read RJ;Richardson DC;Richardson JS;Terwilliger TC;Zwart PH
通讯作者:
Zwart PH