National Natural Science Foundation of China (NSFC)
31971127
中国
National Natural Science Foundation of China (NSFC)
31900930
中国
National Natural Science Foundation of China (NSFC)
32000851
中国
引用
ジャーナル: Nat Commun / 年: 2022 タイトル: Activation and signaling mechanism revealed by GPR119-G complex structures. 著者: Yuxia Qian / Jiening Wang / Linlin Yang / Yanru Liu / Lina Wang / Wei Liu / Yun Lin / Hong Yang / Lixin Ma / Sheng Ye / Shan Wu / Anna Qiao / 要旨: 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 ...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-G 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 Gβ. Disruption of the salt bridge eliminates the cAMP production of GPR119, indicating an important role of Gβ 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.
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