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Structure of a β_1-adrenergic G-protein-coupled receptor

机译:β_1肾上腺素G蛋白偶联受体的结构

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G-protein-coupled receptors have a major role in transmembrane signalling in most eukaryotes and many are important drug targets. Here we report the 2.7 A resolution crystal structure of a β_1adrenergic receptor in complex with the high-affinity antagonist cyanopindolol. The modified turkey (Meleagris gallopavo) receptor was selected to be in its antagonist conformation and its thermostability improved by earlier limited mutagenesis. The ligand-binding pocket comprises 15 side chains from amino acid residues in 4 transmembrane α-helices and extracellular loop 2. This loop defines the entrance of the ligand-binding pocket and is stabilized by two disulphide bonds and a sodium ion. Binding of cyanopindolol to the β_1-adrenergic receptor and binding of carazolol to the β_2-adrenergic receptor involve similar interactions. A short well-defined helix in cytoplasmic loop 2, not observed in either rhodopsin or the β_2-adrenergic receptor, directly interacts by means of a tyrosine with the highly conserved DRY motif at the end of helix 3 that is essential for receptor activation.
机译:在大多数真核生物中,G蛋白偶联受体在跨膜信号传导中起主要作用,许多受体是重要的药物靶标。在这里,我们报告与高亲和力拮抗剂氰基吲哚醇复合的β_1肾上腺素能受体的2.7 A分辨晶体结构。选择改良的火鸡(Meleagris gallopavo)受体,使其具有拮抗构象,并通过早期有限诱变提高了其热稳定性。配体结合袋包括来自4个跨膜α-螺旋和细胞外环2中的氨基酸残基的15个侧链。该环限定了配体结合袋的入口,并通过两个二硫键和一个钠离子稳定。氰基吲哚醇与β_1-肾上腺素受体的结合以及咔唑醇与β_2-肾上腺素受体的结合具有相似的相互作用。在视紫红质或β_2-肾上腺素受体中均未观察到的,在细胞质环2中短而清晰的螺旋,是通过酪氨酸直接与螺旋3末端具有高度保守的DRY基序相互作用的,这对于受体激活至关重要。

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