By comparing ligand-free G protein–coupled receptor (GPCR) structures with those of receptors bound to inverse agonists, agonists and signaling effectors, two recent papers refine the understanding of GPCR activation. One group also reported the oligomeric assembly of the β1 adrenergic receptor in its ligand-free form, raising the question of the role of oligomers in receptor activation.
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Bouvier, M. Unraveling the structural basis of GPCR activation and inactivation. Nat Struct Mol Biol 20, 539–541 (2013). https://doi.org/10.1038/nsmb.2584
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DOI: https://doi.org/10.1038/nsmb.2584
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