【摘 要】
：
G protein-coupled receptors (GPCRs) are responsible for most cytoplasmic signaling in response to extracellular ligands with different efficacy profiles.Various spectroscopic techniques have identified that agonists exhibiting varying efficacies can selec
【机 构】
：
Hefei National Laboratory of Physical Sciences at Microscale and School of Life Sciences,University
论文部分内容阅读
G protein-coupled receptors (GPCRs) are responsible for most cytoplasmic signaling in response to extracellular ligands with different efficacy profiles.Various spectroscopic techniques have identified that agonists exhibiting varying efficacies can selectively stabilize a specific conformation of the receptor.However,the structural basis for activation of the GPCR-G protein complex by ligands with different efficacies is incompletely understood.To better understand the structural basis underlying the mechanisms by which ligands with varying efficacies differentially regulate the conformations of receptors and G proteins,we determined the structures of β2AR-Gαsβγ bound with partial agonist salbutamol or bound with full agonist isoprenaline using single-particle cryo-electron microscopy at resolutions of 3.26 (A) and 3.80(A),respectively.Structural comparisons between the 32AR-Gs-salbutamol and β2AR-Gs-isoprenaline complexes demonstrated that the decreased binding affinity and efficacy of salbutamol compared with those ofisoprenaline might be attributed to weakened hydrogen bonding interactions,attenuated hydrophobic interactions in the orthosteric binding pocket and different conformational changes in the rotamer toggle switch in TM6.Moreover,the observed stronger interactions between the intracellular loop 2 or 3 (ICL2 or ICL3) of β2AR and Gαs with binding of salbutamol versus isoprenaline might decrease phosphorylation in the salbutamol-activated β2AR-Gs complex.From the observed structural differences between these complexes of β2AR,a mechanism of β2AR activation by partial and full agonists is proposed to provide structural insights into β2AR desensitization.
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