Activation and signaling mechanism revealed by GPR119-G(s) complex structures.

Activation and signaling mechanism revealed by GPR119-G(s) complex structures.
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GPR119-Gs复合物结构揭示的激活和信号传导机制

DOI:
10.1038/s41467-022-34696-6
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发表时间:
2022-11-17
影响因子:
16.6
通讯作者:
Qiao, Anna
Qiao, Anna
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Qian, Yuxia;Wang, Jiening;Yang, Linlin;Liu, Yanru;Wang, Lina;Liu, Wei;Lin, Yun;Yang, Hong;Ma, Lixin;Ye, Sheng;Wu, Shan;Qiao, Anna

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选择性靶向类大麻素受体的G蛋白偶联受体(GPCR)GPR119的激动剂有望用于治疗代谢紊乱,同时避免不良副作用。在此,我们展示了人源GPR119 - Gs信号复合物与AR231453和MBX - 2982结合的冷冻电镜(cryo - EM)结构,这两种化合物是已报道的GPR119的代表性激动剂。这些结构显示,跨膜结构域5(TM5)中保守的脯氨酸残基发生了一个氨基酸的位移,形成了一个向外的凸起,在细胞膜中部的TM4和TM5之间开辟出一个疏水腔,用于结合其内源性配体——单不饱和脂质代谢物。此外,我们观察到GPR119的胞内环1(ICL1)与Gβs之间存在一个盐桥。破坏该盐桥会消除GPR119的环磷酸腺苷(cAMP)生成,这表明Gβs在GPR119介导的信号传导中发挥着重要作用。我们的结构以及诱变研究,阐明了化学结构不同的激动剂的保守结合模式,并为受体激活和G蛋白偶联过程中的构象变化提供了深入见解。 选择性靶向GPR119的激动剂有望用于治疗代谢紊乱。在此,作者揭示GPR119采用了一种非典型的共有结构框架,具有一个扩展的配体结合口袋,可容纳化学结构不同的激动剂。
Agonists selectively targeting cannabinoid receptor-like G-protein-coupled receptor (GPCR) GPR119 hold promise for treating metabolic disorders while avoiding unwanted side effects. Here we present the cryo-electron microscopy (cryo-EM) structures of the human GPR119-Gs signaling complexes bound to AR231453 and MBX-2982, two representative agonists reported for GPR119. The structures reveal a one-amino acid shift of the conserved proline residue of TM5 that forms an outward bulge, opening up a hydrophobic cavity between TM4 and TM5 at the middle of the membrane for its endogenous ligands-monounsaturated lipid metabolites. In addition, we observed a salt bridge between ICL1 of GPR119 and Gβs. Disruption of the salt bridge eliminates the cAMP production of GPR119, indicating an important role of Gβs in GPR119-mediated signaling. Our structures, together with mutagenesis studies, illustrate the conserved binding mode of the chemically different agonists, and provide insights into the conformational changes in receptor activation and G protein coupling. Agonists selectively targeting GPR119 hold promise for treating metabolic disorders. Here, authors reveal that GPR119 adopts a non-canonical consensus structural scaffold with an extended ligand-binding pocket for chemically different agonists.
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