Genetically encoded chemical probes in cells reveal the binding path of urocortin-I to CRF class B GPCR.

Genetically encoded chemical probes in cells reveal the binding path of urocortin-I to CRF class B GPCR.
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DOI:
10.1016/j.cell.2013.11.008
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发表时间:
2013-12-05
期刊:
影响因子:
64.5
通讯作者:
Wang L
Wang L
中科院分区:
生物学1区
文献类型:
--
作者:
Coin I;Katritch V;Sun T;Xiang Z;Siu FY;Beyermann M;Stevens RC;Wang L

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调节天然肽激动剂激活B类G蛋白偶联受体(GPCR)的分子决定簇在很大程度上是未知的。我们在这里研究了促肾上腺皮质激素释放因子受体1型(CRF 1 R)和它的天然40-mer肽配体Urocortin-I直接在哺乳动物细胞之间的相互作用。通过将非天然氨基酸的光化学和新的点击化学探针的受体,44个分子间的空间限制已被推导出的配体-受体相互作用。在最近解析的CRF 1 R跨膜结构域和现有胞外结构域结构的晶体结构的背景下分析数据,得到肽-受体复合物的完整构象模型。受体-配体复合物的结构特征产生对受体活化机制的分子见解。该实验策略提供了关于活细胞的天然膜中全长后修饰的GPCR的独特信息,补充了体外生物物理还原方法。
Molecular determinants regulating the activation of class B G-protein coupled receptors (GPCRs) by native peptide agonists are largely unknown. We have investigated here the interaction between the corticotropin releasing factor receptor type 1 (CRF1R) and its native 40-mer peptide ligand Urocortin-I directly in mammalian cells. By incorporating unnatural amino acid photo-chemical and new click-chemical probes into the receptor, 44 inter-molecular spatial constraints have been derived for the ligand-receptor interaction. The data were analyzed in the context of the recently resolved crystal structure of CRF1R transmembrane domain and existing extracellular domain structures, yielding a complete conformational model for the peptide-receptor complex. Structural features of the receptor-ligand complex yield molecular insights on the mechanism of receptor activation. The experimental strategy provides unique information on full-length post-translationally modified GPCRs in the native membrane of the live cell, complementing in vitro biophysical reductionist approaches.
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