期刊
SCIENCE
卷 318, 期 5854, 页码 1266-1273出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1150609
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The beta(2)-adrenergic receptor (beta(2)AR) is a well-studied prototype for heterotrimeric guanine nucleotide-binding protein ( G protein)-coupled receptors (GPCRs) that respond to diffusible hormones and neurotransmitters. To overcome the structural flexibility of the b2AR and to facilitate its crystallization, we engineered a b2AR fusion protein in which T4 lysozyme (T4L) replaces most of the third intracellular loop of the GPCR (beta(2)AR-T4L) and showed that this protein retains near-native pharmacologic properties. Analysis of adrenergic receptor ligand-binding mutants within the context of the reported high-resolution structure of beta(2)AR-T4L provides insights into inverse-agonist binding and the structural changes required to accommodate catecholamine agonists. Amino acids known to regulate receptor function are linked through packing interactions and a network of hydrogen bonds, suggesting a conformational pathway from the ligand-binding pocket to regions that interact with G proteins.
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