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  • Title: Site of G protein binding to rhodopsin mapped with synthetic peptides from the alpha subunit.
    Author: Hamm HE, Deretic D, Arendt A, Hargrave PA, Koenig B, Hofmann KP.
    Journal: Science; 1988 Aug 12; 241(4867):832-5. PubMed ID: 3136547.
    Abstract:
    The interaction between receptors and guanine nucleotide binding (G) proteins leads to G protein activation and subsequent regulation of effector enzymes. The molecular basis of receptor-G protein interaction has been examined by using the ability of the G protein from rods (transducin) to cause a conformational change in rhodopsin as an assay. Synthetic peptides corresponding to two regions near the carboxyl terminus of the G protein alpha subunit, Glu311-Val328 and Ile340-Phe350, compete with G protein for interaction with rhodopsin. Amino acid substitution studies show that Cys321 is required for this effect. Ile340-Phe350 and a modified peptide, acetyl-Glu311-Lys329-amide, mimic G protein effects on rhodopsin conformation, showing that these peptides bind to and stabilize the activated conformation of rhodopsin.
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