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-Structure paper
タイトル | GPCR activation and GRK2 assembly by a biased intracellular agonist. |
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ジャーナル・号・ページ | Nature, Vol. 620, Issue 7974, Page 676-681, Year 2023 |
掲載日 | 2023年8月2日 |
著者 | Jia Duan / Heng Liu / Fenghui Zhao / Qingning Yuan / Yujie Ji / Xiaoqing Cai / Xinheng He / Xinzhu Li / Junrui Li / Kai Wu / Tianyu Gao / Shengnan Zhu / Shi Lin / Ming-Wei Wang / Xi Cheng / Wanchao Yin / Yi Jiang / Dehua Yang / H Eric Xu / |
PubMed 要旨 | Phosphorylation of G-protein-coupled receptors (GPCRs) by GPCR kinases (GRKs) desensitizes G-protein signalling and promotes arrestin signalling, which is also modulated by biased ligands. The ...Phosphorylation of G-protein-coupled receptors (GPCRs) by GPCR kinases (GRKs) desensitizes G-protein signalling and promotes arrestin signalling, which is also modulated by biased ligands. The molecular assembly of GRKs on GPCRs and the basis of GRK-mediated biased signalling remain largely unknown owing to the weak GPCR-GRK interactions. Here we report the complex structure of neurotensin receptor 1 (NTSR1) bound to GRK2, Gα and the arrestin-biased ligand SBI-553. The density map reveals the arrangement of the intact GRK2 with the receptor, with the N-terminal helix of GRK2 docking into the open cytoplasmic pocket formed by the outward movement of the receptor transmembrane helix 6, analogous to the binding of the G protein to the receptor. SBI-553 binds at the interface between GRK2 and NTSR1 to enhance GRK2 binding. The binding mode of SBI-553 is compatible with arrestin binding but clashes with the binding of Gα protein, thus providing a mechanism for its arrestin-biased signalling capability. In sum, our structure provides a rational model for understanding the details of GPCR-GRK interactions and GRK2-mediated biased signalling. |
リンク | Nature / PubMed:37532940 |
手法 | EM (単粒子) |
解像度 | 2.81 - 3.07 Å |
構造データ | EMDB-36474, PDB-8jpb: EMDB-36475, PDB-8jpc: EMDB-36476, PDB-8jpd: EMDB-36477, PDB-8jpe: EMDB-36478, PDB-8jpf: |
化合物 | ChemComp-STU: ChemComp-GDP: ChemComp-MG: ChemComp-ALF: ChemComp-SRW: |
由来 |
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キーワード | SIGNALING PROTEIN / Biased signaling |