Activation of NMDA receptors and the mechanism of inhibition by ifenprodil

Tajima, N., Karakas, E., Grant, T., Simorowski, N., Diaz-Avalos, R., Grigorieff, N., Furukawa, H. (2016) Activation of NMDA receptors and the mechanism of inhibition by ifenprodil. Nature, 534 (7605). pp. 63-8. ISSN 1476-4687 (Electronic)0028-0836 (Linking)

URL: http://www.ncbi.nlm.nih.gov/pubmed/27135925
DOI: 10.1038/nature17679

Abstract

The physiology of N-methyl-d-aspartate (NMDA) receptors is fundamental to brain development and function. NMDA receptors are ionotropic glutamate receptors that function as heterotetramers composed mainly of GluN1 and GluN2 subunits. Activation of NMDA receptors requires binding of neurotransmitter agonists to a ligand-binding domain (LBD) and structural rearrangement of an amino-terminal domain (ATD). Recent crystal structures of GluN1-GluN2B NMDA receptors bound to agonists and an allosteric inhibitor, ifenprodil, represent the allosterically inhibited state. However, how the ATD and LBD move to activate the NMDA receptor ion channel remains unclear. Here we applied X-ray crystallography, single-particle electron cryomicroscopy and electrophysiology to rat NMDA receptors to show that, in the absence of ifenprodil, the bi-lobed structure of GluN2 ATD adopts an open conformation accompanied by rearrangement of the GluN1-GluN2 ATD heterodimeric interface, altering subunit orientation in the ATD and LBD and forming an active receptor conformation that gates the ion channel.

Item Type: Paper
Subjects: bioinformatics > genomics and proteomics > genetics & nucleic acid processing > protein structure, function, modification > protein types > NMDA receptor
Investigative techniques and equipment > x ray crystallography
CSHL Authors:
Communities: CSHL labs > Furukawa lab
Depositing User: Matt Covey
Date Deposited: 09 May 2016 19:43
Last Modified: 07 Sep 2017 16:45
PMCID: PMC5136294
Related URLs:
Dataset ID:
URI: http://repository.cshl.edu/id/eprint/32777

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