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- W1965064544 abstract "The beta(2)-adrenoceptor (beta(2)AR) was one of the first Family A G protein-coupled receptors (GPCRs) shown to form oligomers in cellular membranes, yet we still know little about the number and arrangement of protomers in oligomers, the influence of ligands on the organization or stability of oligomers, or the requirement for other proteins to promote oligomerization. We used fluorescence resonance energy transfer (FRET) to characterize the oligomerization of purified beta(2)AR site-specifically labelled at three different positions with fluorophores and reconstituted into a model lipid bilayer. Our results suggest that the beta(2)AR is predominantly tetrameric following reconstitution into phospholipid vesicles. Agonists and antagonists have little effect on the relative orientation of protomers in oligomeric complexes. In contrast, binding of inverse agonists leads to significant increases in FRET efficiencies for most labelling pairs, suggesting that this class of ligand promotes tighter packing of protomers and/or the formation of more complex oligomers by reducing conformational fluctuations in individual protomers. The results provide new structural insights into beta(2)AR oligomerization and suggest a possible mechanism for the functional effects of inverse agonists." @default.
- W1965064544 created "2016-06-24" @default.
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- W1965064544 date "2009-09-17" @default.
- W1965064544 modified "2023-09-23" @default.
- W1965064544 title "Ligand-regulated oligomerization of β2-adrenoceptors in a model lipid bilayer" @default.
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- W1965064544 doi "https://doi.org/10.1038/emboj.2009.267" @default.
- W1965064544 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2748299" @default.
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