G-protein activation of the dark-state conformation of the visual G protein-coupled receptor rhodopsin by releasing critical structural constraints.

Abstract excerpt

G protein-coupled receptors (GPCRs) operate through the binding and activation of heterotrimeric G proteins. Ligand interaction drives the receptor's transition from an inactive to an active state, ultimately triggering G-protein activation and downstream signal transduction. The visual GPCR rhodopsin contains the chromophore 11-cis-retinal, which is covalently bound and functions as an inverse agonist,...

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