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Cherezov, Vadim; Rosenbaum, Daniel M.; Hanson, Michael A.; Rasmussen, Søren G. F.; Thian, Foon Sun; Kobilka, Tong Sun; Choi, Hee-Jung; Kuhn, Peter; Weis, William I.; Kobilka, Brian K.; Stevens, Raymond C. (2007)
Languages: English
Types: Article
Subjects: Article
G protein-coupled receptors comprise the largest family of eukaryotic signal transduction proteins that communicate across the membrane. We report the crystal structure of a human β2-adrenergic receptor—T4 lysozyme fusion protein bound to the partial inverse agonist carazolol at 2.4 Å resolution. The structure provides a high-resolution view of a human G protein-coupled receptor bound to a diffusible ligand. Ligand-binding site accessibility is enabled by the second extracellular loop which is held out of the binding cavity by a pair of closely spaced disulfide bridges and a short helical segment within the loop. Cholesterol, a necessary component for crystallization, mediates an intriguing parallel association of receptor molecules in the crystal lattice. Although the location of carazolol in the β2-adrenergic receptor is very similar to that of retinal in rhodopsin, structural differences in the ligand binding site and other regions highlight the challenges in using rhodopsin as a template model for this large receptor family.
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