Structure and dynamics of AMPA receptor GluA2 in resting, pre-open, and desensitized states.

Structure and dynamics of AMPA receptor GluA2 in resting, pre-open, and desensitized states.
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AMPA受体GLUA2在休息,预开口和脱敏状态中的结构和动力学。

DOI:
10.1016/j.cell.2014.07.023
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发表时间:
2014-08-14
期刊:
影响因子:
64.5
通讯作者:
Gouaux E
Gouaux E
中科院分区:
生物学1区
文献类型:
--
作者:
Dürr KL;Chen L;Stein RA;De Zorzi R;Folea IM;Walz T;Mchaourab HS;Gouaux E

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离子型谷氨酸受体(iGluRs)介导神经系统中的大部分快速兴奋性信号传导。尽管iGluRs在神经系统中具有深远的重要性,但对处于不同功能状态的完整受体的结构和动力学知之甚少。在这里,我们阐明了完整的GluA 2 AMPA受体的结构在载脂蛋白静息/关闭状态,在激活/预开放状态结合的部分激动剂和正变构调节剂和在脱敏/关闭状态的复杂FW单独。为了探索这些状态的构象特性,我们进行了双电子-电子共振实验半胱氨酸突变体和冷冻电子显微镜研究。我们展示了激动剂结合如何调节完整受体的配体结合结构域“层”的构象,以及如何在脱敏后,受体经历氨基末端和配体结合结构域的大构象重排。我们定义了理解AMPA iGluRs中的拮抗、激活和脱敏的机械原理。
Ionotropic glutamate receptors (iGluRs) mediate the majority of fast excitatory signaling in the nervous system. Despite the profound importance of iGluRs in the nervous system, little is known about the structures and dynamics of intact receptors in distinct functional states. Here we elucidate the structures of the intact GluA2 AMPA receptor in an apo resting/closed state, in an activated/pre-open state bound with the partial agonists and a positive allosteric modulator and in a desensitized/closed state in complex with FW alone. To probe the conformational properties of these states, we carried out double electron-electron resonance experiments on cysteine mutants and cryo-electron microscopy studies. We show how agonist binding modulates the conformation of the ligand binding domain 'layer' of the intact receptors and how, upon desensitization, the receptor undergoes large conformational rearrangements of amino-terminal and ligand-binding domains. We define mechanistic principles by which to understand antagonism, activation and desensitization in AMPA iGluRs.
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