The C9 methyl group of retinal interacts with glycine-121 in rhodopsin.

Abstract

The visual pigment rhodopsin is a prototypical G protein-coupled receptor. These receptors have seven transmembrane helices and are activated by specific receptor-ligand interactions. Rhodopsin is unusual in that its retinal prosthetic group serves as an antagonist in the dark in the 11-cis conformation but is rapidly converted to an agonist on… (More)

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