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Ionotropic glutamate receptors are postsynaptic tetrameric ligand-gated channels whose activity mediates fast excitatory transmission. Glutamate binding to clamshell-shaped ligand binding domains (LBDs) triggers opening of the integral ion channel, but how the four LBDs orchestrate receptor activation is unknown. Here, we present a high-resolution x-ray crystal structure displaying two tetrameric...
The kinetics of ligand gated ion channels are tuned to permit diverse roles in cellular signaling. To follow high-frequency excitatory synaptic input, postsynaptic AMPA-type glutamate receptors must recover rapidly from desensitization. Chimeras between AMPA and the related kainate receptors demonstrate that the ligand binding domains alone control the lifetime of the desensitized state. Mutation...
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