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- W3197647777 abstract "Ionotropic glutamate receptors (iGluRs) mediate signal transmission in the brain and are important drug targets. Structural studies show snapshots of iGluRs, which provide a mechanistic understanding of gating, yet the rapid motions driving the receptor machinery are largely elusive. Here we detect kinetics of conformational change of isolated clamshell-shaped ligand-binding domains (LBDs) from the three major iGluR sub-types, which initiate gating upon binding of agonists. We design fluorescence probes to measure domain motions through nanosecond fluorescence correlation spectroscopy. We observe a broad kinetic spectrum of LBD dynamics that underlie activation of iGluRs. Microsecond clamshell motions slow upon dimerization and freeze upon binding of full and partial agonists. We uncover allosteric coupling within NMDA LBD hetero-dimers, where binding of L-glutamate to the GluN2A LBD stalls clamshell motions of the glycine-binding GluN1 LBD. Our results reveal rapid LBD dynamics across iGluRs and suggest a mechanism of negative allosteric cooperativity in NMDA receptors." @default.
- W3197647777 created "2021-09-13" @default.
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- W3197647777 date "2021-09-09" @default.
- W3197647777 modified "2023-09-27" @default.
- W3197647777 title "Allosteric coupling of sub-millisecond clamshell motions in ionotropic glutamate receptor ligand-binding domains" @default.
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- W3197647777 doi "https://doi.org/10.1038/s42003-021-02605-0" @default.
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