The structure-energy landscape of NMDA receptor gating.

The structure-energy landscape of NMDA receptor gating.
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DOI:
10.1038/nchembio.2487
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发表时间:
2017-12
影响因子:
14.8
通讯作者:
Jayaraman V
Jayaraman V
中科院分区:
生物学1区
文献类型:
--
作者:
Dolino DM;Chatterjee S;MacLean DM;Flatebo C;Bishop LDC;Shaikh SA;Landes CF;Jayaraman V

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N-甲基-D-天冬氨酸(NMDA)受体是哺乳动物中枢神经系统中主要的钙渗透性兴奋性受体。NMDA受体门控是复杂的,表现出多个封闭,开放和脱敏状态,然而,关于跨膜结构域的构象和能量学的中心问题,因为它们涉及到门控状态仍然没有答案。在这里,使用单分子Förster共振能量转移(smFRET),我们映射的能量景观的第一个跨膜段的褐家鼠NMDA受体在休息和各种配体条件下。这些结果显示了与载脂蛋白、激动剂结合和抑制受体相关的动力学和结构上的不同变化,这些变化通过该位点的线性门控机制联系在一起。此外,smFRET数据表明,变构抑制锌发生的激动剂诱导的变化在细胞外结构域的门控运动导致一个apo样状态的解偶联,而地佐环平,一个孔阻滞剂,稳定多个紧密包装的跨膜状态。
N-methyl-D-aspartate (NMDA) receptors are the main calcium-permeable excitatory receptors in the mammalian central nervous system. The NMDA receptor gating is complex, exhibiting multiple closed, open, and desensitized states; however, the central questions regarding the conformations and energetics of the transmembrane domains as they relate to the gating states are still unanswered. Here, using single molecule Förster Resonance Energy Transfer (smFRET), we map the energy landscape of the first transmembrane segment of the Rattus norvegicus NMDA receptor under resting and various liganded conditions. These results show kinetically and structurally distinct changes associated with apo, agonist-bound, and inhibited receptors linked by a linear mechanism of gating at this site. Furthermore, the smFRET data suggest that allosteric inhibition by zinc occurs by an uncoupling of the agonist-induced changes at the extracellular domains from the gating motions leading to an apo-like state, while dizocilpine, a pore blocker, stabilizes multiple closely packed transmembrane states.
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