A lipid site shapes the agonist response of a pentameric ligand-gated ion channel.

A lipid site shapes the agonist response of a pentameric ligand-gated ion channel.
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脂质位点塑造五聚体配体门控离子通道的激动剂反应。

DOI:
10.1038/s41589-019-0369-4
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发表时间:
2019-12
影响因子:
14.8
通讯作者:
Ulens C
Ulens C
中科院分区:
生物学1区
文献类型:
--
作者:
Hénault CM;Govaerts C;Spurny R;Brams M;Estrada-Mondragon A;Lynch J;Bertrand D;Pardon E;Evans GL;Woods K;Elberson BW;Cuello LG;Brannigan G;Nury H;Steyaert J;Baenziger JE;Ulens C

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磷脂是细胞膜的关键组分,并且正在成为不同膜蛋白的重要功能调节剂,包括五聚体配体门控离子通道(pLGIC)。在这里,我们利用原核细胞通道ELIC(欧文氏菌配体门控离子通道)作为一个模型,以了解在这个家庭的受体磷脂相互作用的决定因素。ELIC在脂质结合状态下的高分辨率结构揭示了在成孔跨膜螺旋M1和M4的下半部分以及在神经类固醇、胆固醇或全身麻醉剂的附近位点处的磷脂位点。该位点由M4-螺旋扭结和Trp-Arg-Pro三联体形成,Trp-Arg-Pro三联体在真核生物GABAA/C和甘氨酸受体中高度保守。一个综合的方法表明,M4是内在的灵活性和M4的脂质结合位点的缺失或中断加速脱敏ELIC,这表明脂质相互作用的形状激动剂的反应。我们的数据提供了一个结构的背景下,了解脂质调制pLGICs。
Phospholipids are key components of cellular membranes and are emerging as important functional regulators of different membrane proteins, including pentameric ligand-gated ion channels (pLGICs). Here, we take advantage of the prokaryote channel ELIC (Erwinia ligand-gated ion channel) as a model to understand the determinants of phospholipid interactions in this family of receptors. A high-resolution structure of ELIC in a lipid-bound state reveals a phospholipid site at the lower half of pore-forming transmembrane helices M1 and M4 and at a nearby site for neurosteroids, cholesterol or general anesthetics. This site is shaped by an M4-helix kink and a Trp–Arg–Pro triad that is highly conserved in eukaryote GABAA/C and glycine receptors. A combined approach reveals that M4 is intrinsically flexible and that M4 deletions or disruptions of the lipid-binding site accelerate desensitization in ELIC, suggesting that lipid interactions shape the agonist response. Our data offer a structural context for understanding lipid modulation in pLGICs.
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