Activation and Desensitization Mechanism of AMPA Receptor-TARP Complex by Cryo-EM.

Activation and Desensitization Mechanism of AMPA Receptor-TARP Complex by Cryo-EM.
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DOI:
10.1016/j.cell.2017.07.045
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发表时间:
2017-09-07
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:
Chen S;Zhao Y;Wang Y;Shekhar M;Tajkhorshid E;Gouaux E

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AMPA receptors mediate fast excitatory neurotransmission in the mammalian brain and transduce the binding of presynaptically released glutamate to the opening of a transmembrane cation channel. Within the postsynaptic density, however, AMPA receptors coassemble with transmembrane AMPA receptor regulatory proteins (TARPs), yielding a receptor complex with altered gating kinetics, pharmacology and pore properties. Here we elucidate structures of the GluA2-TARP γ2 complex in the presence of the partial agonist kainate or the full agonist quisqualate together with a positive allosteric modulator, or with quisqualate alone. We show how TARPs sculpt the ligand binding domain gating ring, enhancing kainate potency and diminishing the ensemble of desensitized states. TARPs encircle the receptor ion channel, stabilizing M2 helices and pore loops, illustrating how TARPs alter receptor pore properties. Structural and computational analysis suggests the full agonist/modulator complex harbors an ion-permeable channel gate, providing the first view of an activated AMPA receptor.
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