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• W2189201950 abstract "The first step in the transmembrane signal mediated by G protein-coupled receptors is binding of agonist to receptors at the cell surface. The mechanism of the resulting receptor activation is not clear, but models based on the ternary complex model are capable of explaining most of the observations that have been reported in G protein-coupled receptors. This model suggests that a single agonist/receptor/G protein complex capable of activating G protein is formed as the result of agonist binding. Extensions of this basic model differ primarily in whether an equilibrium between active and inactive conformations is required to explain experimental results. We report results on ligand binding and coupling to physiological effector systems of the m2 muscarinic acetylcholine receptor site-directed mutant Y403F (residue 403 mutated from tyrosine to phenylalanine) expressed in Chinese hamster ovary cells and compare our results with results reported for the homologous Y506F mutation in the m3 muscarinic receptor [<i>J. Biol. Chem. </i><b>267:</b>19313–19319 (1992)]. The mutation in the m2 muscarinic receptor reduced absolute agonist affinities more dramatically than in the m3 muscarinic receptor. Unlike the results reported for the m3 subtype mutant, in which coupling to physiological effector systems was reduced, coupling to effector systems for the mutant in the m2 subtype was robust. In the Y403F m2 muscarinic receptor, the difference between the two agonist binding affinities was greater than in the wild-type receptor, whereas in the m3 subtype, the effect of the mutation was to decrease this difference. A prediction of the ternary complex model is that relative binding affinities will affect the steady state concentration of the agonist/receptor/G protein complex and, as the result, the extent of G protein coupling. These results can best be rationalized by this model, which suggests that the activation of G protein-coupled receptors is achieved by the relative affinity of agonist for two receptor states and does not require the existence of multiple states in conformational equilibrium." @default.
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• W2189201950 title "Site-Directed Mutagenesis on the m2 Muscarinic Acetylcholine Receptor: The Significance of Tyr403 in the Binding of Agonists and Functional Coupling" @default.
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• W2189201950 doi "https://doi.org/10.1124/mol.52.6.1087" @default.
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