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- W2051514715 abstract "The second extracellular (E2) loop of G protein-coupled receptors (GPCRs) plays an essential but poorly understood role in the binding of non-peptidic small molecules. We have utilized both orthosteric ligands and allosteric modulators of the M2 muscarinic acetylcholine receptor, a prototypical Family A GPCR, to probe possible E2 loop binding dynamics. We developed a homology model based on the crystal structure of bovine rhodopsin and predicted novel cysteine substitutions that should dramatically reduce E2 loop flexibility via disulfide bond formation and significantly inhibit the binding of both types of ligands. This prediction was validated experimentally using radioligand binding, dissociation kinetics, and cell-based functional assays. The results argue for a flexible gatekeeper role of the E2 loop in the binding of both allosteric and orthosteric GPCR ligands." @default.
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- W2051514715 date "2007-08-01" @default.
- W2051514715 modified "2023-10-14" @default.
- W2051514715 title "Critical Role for the Second Extracellular Loop in the Binding of Both Orthosteric and Allosteric G Protein-coupled Receptor Ligands" @default.
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- W2051514715 doi "https://doi.org/10.1074/jbc.m702311200" @default.
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