Receptor Expression and G Protein Coupling in Orphan GPCR Cell Lines, Related to
(A) Cell-surface expression of induced oGPCRs measured by ELISA. Data shown as mean ± SEM from n = 3-7 independent experiments performed in triplicate.
(B-D) Constitutive cAMP and IP1 production (i.e., in the absence of ligand) upon orphan receptor induction provide insights into G protein-coupling. Data shown as mean ± SEM from n = 3-5 independent experiments, except for BRS3/BB3 (n = 2 in (B) and (C)), GPR32 (n = 2 in (B)) and GPR3 (n = 2 in (C)).
(E) For three receptors, we discovered constitutive G protein-coupling unreported in Guide to Pharmacology or literature (, , , , , , ), and for GPR15 robust Gi/o signaling in cAMP accumulation assays.