sphingosine-1-phosphate receptor activity / regulation of metabolic process / electron transport chain / G protein-coupled receptor activity / adenylate cyclase-activating G protein-coupled receptor signaling pathway / positive regulation of cytosolic calcium ion concentration / periplasmic space / electron transfer activity / G protein-coupled receptor signaling pathway / iron ion binding ...sphingosine-1-phosphate receptor activity / regulation of metabolic process / electron transport chain / G protein-coupled receptor activity / adenylate cyclase-activating G protein-coupled receptor signaling pathway / positive regulation of cytosolic calcium ion concentration / periplasmic space / electron transfer activity / G protein-coupled receptor signaling pathway / iron ion binding / heme binding / plasma membrane / cytoplasm 類似検索 - 分子機能
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35 GM127086
米国
引用
ジャーナル: Sci Signal / 年: 2024 タイトル: Structural insights into the high basal activity and inverse agonism of the orphan receptor GPR6 implicated in Parkinson's disease. 著者: Mahta Barekatain / Linda C Johansson / Jordy H Lam / Hao Chang / Anastasiia V Sadybekov / Gye Won Han / Joseph Russo / Joshua Bliesath / Nicola L Brice / Mark B L Carlton / Kumar S Saikatendu ...著者: Mahta Barekatain / Linda C Johansson / Jordy H Lam / Hao Chang / Anastasiia V Sadybekov / Gye Won Han / Joseph Russo / Joshua Bliesath / Nicola L Brice / Mark B L Carlton / Kumar S Saikatendu / Hukai Sun / Sean T Murphy / Holger Monenschein / Hans H Schiffer / Petr Popov / Corinne A Lutomski / Carol V Robinson / Zhi-Jie Liu / Tian Hua / Vsevolod Katritch / Vadim Cherezov / 要旨: GPR6 is an orphan G protein-coupled receptor with high constitutive activity found in D2-type dopamine receptor-expressing medium spiny neurons of the striatopallidal pathway, which is aberrantly ...GPR6 is an orphan G protein-coupled receptor with high constitutive activity found in D2-type dopamine receptor-expressing medium spiny neurons of the striatopallidal pathway, which is aberrantly hyperactivated in Parkinson's disease. Here, we solved crystal structures of GPR6 without the addition of a ligand (a pseudo-apo state) and in complex with two inverse agonists, including CVN424, which improved motor symptoms in patients with Parkinson's disease in clinical trials. In addition, we obtained a cryo-electron microscopy structure of the signaling complex between GPR6 and its cognate G heterotrimer. The pseudo-apo structure revealed a strong density in the orthosteric pocket of GPR6 corresponding to a lipid-like endogenous ligand. A combination of site-directed mutagenesis, native mass spectrometry, and computer modeling suggested potential mechanisms for high constitutive activity and inverse agonism in GPR6 and identified a series of lipids and ions bound to the receptor. The structures and results obtained in this study could guide the rational design of drugs that modulate GPR6 signaling.