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• W2061163620 endingPage "13447" @default.
• W2061163620 startingPage "13442" @default.
• W2061163620 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 photochemical cis to trans isomerization. Receptor-ligand interactions in rhodopsin were studied in the light and dark by regenerating site-directed opsin mutants with synthetic retinal analogues. A progressive decrease in light-dependent transducin activity was observed when a mutant opsin with a replacement of Gly121 was regenerated with 11-cis-retinal analogues bearing progressively larger R groups (methyl, ethyl, propyl) at the C9 position of the polyene chain. A progressive decrease in light activity was also observed as a function of increasing size of the residue at position 121 for both the 11-cis-9-ethyl- and the 11-cis-9-propylretinal pigments. In contrast, a striking increase of receptor activity in the dark-i.e., without chromophore isomerization-was observed when the molecular volume at either position 121 of opsin or C9 of retinal was increased. The ability of bulky replacements at either position to hinder ligand incorporation and to activate rhodopsin in the dark suggests a direct interaction between these two sites. A molecular model of the retinal-binding site of rhodopsin is proposed that illustrates the specific interaction between Gly121 and the C9 methyl group of 11-cis-retinal. Steric interactions in this region of rhodopsin are consistent with the proposal that movement of transmembrane helices 3 and 6 is concomitant with receptor activation." @default.
• W2061163620 created "2016-06-24" @default.
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• W2061163620 date "1997-12-09" @default.
• W2061163620 modified "2023-10-13" @default.
• W2061163620 title "The C9 methyl group of retinal interacts with glycine-121 in rhodopsin" @default.
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• W2061163620 doi "https://doi.org/10.1073/pnas.94.25.13442" @default.
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