Classically, the GPCR signaling pathway is considered to be a three-component system that involves a seven-transmembrane-domain receptor, a trimeric G-protein complex (Gα, Gβ, Gγ) and an effector.

As the largest family of cell surface receptors, GPCRs account for over one-third of drug screening efforts. Inositol-1-phosphate (IP1) is a metabolite of Gq signaling and has been shown to be very ...