Cryo-EM structure of human GPR158 receptor coupled to the RGS7-Gβ5 signaling complex

作者：Dipak N. Patil, Shikha Singh, Thibaut Laboute, Timothy S. Strutzenberg, Xingyu Qiu, Di Wu, Scott J. Novick, Carol V. Robinson, Patrick R. Griffin, J.F. Hunt, Tina Izard, Appu K. Singh, Kirill A. Martemyanov · 发表于：Science · 年份：2022 · DOI：10.1126/science.abl4732 · 被引用次数：61 · 研究领域：Receptor Mechanisms and Signaling、Protein Kinase Regulation and GTPase Signaling、Neuropeptides and Animal Physiology

GPR158 is an orphan G protein–coupled receptor (GPCR) highly expressed in the brain, where it controls synapse formation and function. GPR158 has also been implicated in depression, carcinogenesis, and cognition. However, the structural organization and signaling mechanisms of GPR158 are largely unknown. We used single-particle cryo–electron microscopy (cryo-EM) to determine the structures of human GPR158 alone and bound to an RGS signaling complex. The structures reveal a homodimeric organization stabilized by a pair of phospholipids and the presence of an extracellular Cache domain, an unusual ligand-binding domain in GPCRs. We further demonstrate the structural basis of GPR158 coupling to RGS7-Gβ5. Together, these results provide insights into the unusual biology of orphan receptors and the formation of GPCR-RGS complexes.