Biased signaling pathways in β2-adrenergic receptor characterized by 19F-NMR.
Biased signaling pathways in β2-adrenergic receptor characterized by 19F-NMR.
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DOI:
10.1126/science.1215802
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发表时间:
2012-03-02
期刊:
影响因子:
--
通讯作者:
Wüthrich K
中科院分区:
文献类型:
--
作者:
Liu JJ;Horst R;Katritch V;Stevens RC;Wüthrich K
Extracellular ligand binding to G protein-coupled receptors (GPCRs) modulates G-protein and β-arrestin signaling by changing the conformational states of the cytoplasmic region of the receptor. Using site-specific 19F-NMR labels in the β2-adrenergic receptor (β2AR) in complexes with various ligands, we observed that the cytoplasmic ends of helices VI and VII adopt two major conformational states. Changes in the NMR signals reveal that agonist binding primarily shifts the equilibrium towards the G protein specific active state of helix VI. In contrast, β-arrestin-biased ligands predominantly impact the conformational states of helix VII. The selective effects of different ligands on the conformational equilibria involving helices VI and VII provide insights into the long-range structural plasticity of β2AR in partial and biased agonist signaling.
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