The role of a sodium ion binding site in the allosteric modulation of the A(2A) adenosine G protein-coupled receptor.

The role of a sodium ion binding site in the allosteric modulation of the A(2A) adenosine G protein-coupled receptor.
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DOI:
10.1016/j.str.2013.09.020
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发表时间:
2013-12-03
期刊:
影响因子:
5.7
通讯作者:
Stevens, Raymond C.
Stevens, Raymond C.
中科院分区:
生物学2区
文献类型:
--
作者:
Gutierrez-de-Teran, Hugo;Massink, Arnault;Rodriguez Sanz, David;Liu, Wei;Han, Gye Won;Joseph, Jeremiah S.;Katritch, Ilia;Heitman, Laura H.;Xia, Lizi;IJzerman, Adriaan P.;Cherezov, Vadim;Katritch, Vsevolod;Stevens, Raymond C.

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G 蛋白偶联受体 (GPCR) 的功能可以通过许多内源变构分子进行调节。在这项研究中,我们利用分子动力学、放射性配体结合和热稳定性实验来阐明最近发现的钠离子结合位点在人类 A2A 腺苷受体变构调节中的作用,该受体在 A 类 GPCR 中保守。虽然拮抗剂和钠离子与受体的结合本质上是非竞争性的,但激动剂和钠离子的结合似乎需要受体的相互排斥的构象状态。阿米洛利类似物还可以与钠结合袋结合,显示出不同的激动剂和拮抗剂调节模式。这些发现表明,钠离子的生理浓度会影响 GPCR 的功能相关构象状态,并且有助于设计利用钠离子结合袋的新型合成变构调节剂或双位配体。
The function of G protein-coupled receptors (GPCRs) can be modulated by a number of endogenous allosteric molecules. In this study, we used molecular dynamics, radioligand binding and thermostability experiments to elucidate the role of the recently discovered sodium ion binding site in the allosteric modulation of the human A2A adenosine receptor, conserved among class A GPCRs. While the binding of antagonists and sodium ions to the receptor was non-competitive in nature, the binding of agonists and sodium ions appears to require mutually exclusive conformational states of the receptor. Amiloride analogs can also bind to the sodium binding pocket showing distinct patterns of agonist and antagonist modulation. These findings suggest that physiological concentrations of sodium ions affect functionally relevant conformational states of GPCRs, and can help to design novel synthetic allosteric modulators or bitopic ligands exploiting the sodium ion binding pocket.
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