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Cryo-EM Structure of the Prostaglandin E2 Receptor 4 Coupled to G Protein
Structural highlights
FunctionGNAI1_HUMAN Guanine nucleotide-binding proteins (G proteins) are involved as modulators or transducers in various transmembrane signaling systems. The G(i) proteins are involved in hormonal regulation of adenylate cyclase: they inhibit the cyclase in response to beta-adrenergic stimuli. The inactive GDP-bound form prevents the association of RGS14 with centrosomes and is required for the translocation of RGS14 from the cytoplasm to the plasma membrane. May play a role in cell division.[1] [2] Publication Abstract from PubMedTo accomplish concerted physiological reactions, nature has diversified functions of a single hormone at at least two primary levels: 1) Different receptors recognize the same hormone, and 2) different cellular effectors couple to the same hormone-receptor pair [R.P. Xiao, Sci STKE 2001, re15 (2001); L. Hein, J. D. Altman, B.K. Kobilka, Nature 402, 181-184 (1999); Y. Daaka, L. M. Luttrell, R. J. Lefkowitz, Nature 390, 88-91 (1997)]. Not only these questions lie in the heart of hormone actions and receptor signaling but also dissecting mechanisms underlying these questions could offer therapeutic routes for refractory diseases, such as kidney injury (KI) or X-linked nephrogenic diabetes insipidus (NDI). Here, we identified that G(s)-biased signaling, but not G(i) activation downstream of EP4, showed beneficial effects for both KI and NDI treatments. Notably, by solving Cryo-electron microscope (cryo-EM) structures of EP3-G(i), EP4-G(s), and EP4-G(i) in complex with endogenous prostaglandin E(2) (PGE(2))or two synthetic agonists and comparing with PGE(2)-EP2-G(s) structures, we found that unique primary sequences of prostaglandin E2 receptor (EP) receptors and distinct conformational states of the EP4 ligand pocket govern the G(s)/G(i) transducer coupling selectivity through different structural propagation paths, especially via TM6 and TM7, to generate selective cytoplasmic structural features. In particular, the orientation of the PGE(2) omega-chain and two distinct pockets encompassing agonist L902688 of EP4 were differentiated by their G(s)/G(i) coupling ability. Further, we identified common and distinct features of cytoplasmic side of EP receptors for G(s)/G(i) coupling and provide a structural basis for selective and biased agonist design of EP4 with therapeutic potential. Single hormone or synthetic agonist induces G(s)/G(i) coupling selectivity of EP receptors via distinct binding modes and propagating paths.,Huang SM, Xiong MY, Liu L, Mu J, Wang MW, Jia YL, Cai K, Tie L, Zhang C, Cao S, Wen X, Wang JL, Guo SC, Li Y, Qu CX, He QT, Cai BY, Xue C, Gan S, Xie Y, Cong X, Yang Z, Kong W, Li S, Li Z, Xiao P, Yang F, Yu X, Guan YF, Zhang X, Liu Z, Yang BX, Du Y, Sun JP Proc Natl Acad Sci U S A. 2023 Jul 25;120(30):e2216329120. doi: , 10.1073/pnas.2216329120. Epub 2023 Jul 21. PMID:37478163[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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