National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)
2R01-HL016037-47
米国
引用
ジャーナル: Nat Struct Mol Biol / 年: 2019 タイトル: Structure of an endosomal signaling GPCR-G protein-β-arrestin megacomplex. 著者: Anthony H Nguyen / Alex R B Thomsen / Thomas J Cahill / Rick Huang / Li-Yin Huang / Tara Marcink / Oliver B Clarke / Søren Heissel / Ali Masoudi / Danya Ben-Hail / Fadi Samaan / Venkata P ...著者: Anthony H Nguyen / Alex R B Thomsen / Thomas J Cahill / Rick Huang / Li-Yin Huang / Tara Marcink / Oliver B Clarke / Søren Heissel / Ali Masoudi / Danya Ben-Hail / Fadi Samaan / Venkata P Dandey / Yong Zi Tan / Chuan Hong / Jacob P Mahoney / Sarah Triest / John Little / Xin Chen / Roger Sunahara / Jan Steyaert / Henrik Molina / Zhiheng Yu / Amedee des Georges / Robert J Lefkowitz / 要旨: Classically, G-protein-coupled receptors (GPCRs) are thought to activate G protein from the plasma membrane and are subsequently desensitized by β-arrestin (β-arr). However, some GPCRs continue to ...Classically, G-protein-coupled receptors (GPCRs) are thought to activate G protein from the plasma membrane and are subsequently desensitized by β-arrestin (β-arr). However, some GPCRs continue to signal through G protein from internalized compartments, mediated by a GPCR-G protein-β-arr 'megaplex'. Nevertheless, the molecular architecture of the megaplex remains unknown. Here, we present its cryo-electron microscopy structure, which shows simultaneous engagement of human G protein and bovine β-arr to the core and phosphorylated tail, respectively, of a single active human chimeric β-adrenergic receptor with the C-terminal tail of the arginine vasopressin type 2 receptor (βVR). All three components adopt their canonical active conformations, suggesting that a single megaplex GPCR is capable of simultaneously activating G protein and β-arr. Our findings provide a structural basis for GPCR-mediated sustained internalized G protein signaling.