Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Molecular Basis for Subtype Specificity and High-Affinity Zinc Inhibition in the GluN1-GluN2A NMDA Receptor Amino-Terminal Domain

Journal Article · · Neuron
Zinc is vastly present in the mammalian brain and controls functions of various cell surface receptors to regulate neurotransmission. A distinctive characteristic of N-methyl-D-aspartate (NMDA) receptors containing a GluN2A subunit is that their ion channel activity is allosterically inhibited by a nano-molar concentration of zinc that binds to an extracellular domain called an amino-terminal domain (ATD). Despite physiological importance, the molecular mechanism underlying the high-affinity zinc inhibition has been incomplete because of the lack of a GluN2A ATD structure. Here we show the first crystal structures of the heterodimeric GluN1-GluN2A ATD, which provide the complete map of the high-affinity zinc-binding site and reveal distinctive features from the ATD of the GluN1-GluN2B subtype. Perturbation of hydrogen bond networks at the hinge of the GluN2A bi-lobe structure affects both zinc inhibition and open probability, supporting the general model in which the bi-lobe motion in ATD regulates the channel activity in NMDA receptors.
Research Organization:
Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
Sponsoring Organization:
USDOE Office of Science (SC)
OSTI ID:
1352282
Journal Information:
Neuron, Journal Name: Neuron Journal Issue: 6 Vol. 92; ISSN 0896-6273
Publisher:
Cell Press - ElsevierCopyright Statement
Country of Publication:
United States
Language:
ENGLISH

References (41)

Enhancing the secretion of recombinant proteins by engineering N-glycosylation sites journal July 2009
A Trafficking Checkpoint Controls GABAB Receptor Heterodimerization journal July 2000
Molecular Organization of a Zinc Binding N-Terminal Modulatory Domain in a NMDA Receptor Subunit journal December 2000
Identification and Mechanism of Action of Two Histidine Residues Underlying High-Affinity Zn2+ Inhibition of the NMDA Receptor journal May 1999
Four Residues of the Extracellular N-Terminal Domain of the NR2A Subunit Control High-Affinity Zn2+ Binding to NMDA Receptors journal March 2000
The Actions of Synaptically Released Zinc at Hippocampal Mossy Fiber Synapses journal April 2000
Anti-NMDA-receptor encephalitis: case series and analysis of the effects of antibodies journal December 2008
Mechanism of NMDA Receptor Inhibition and Activation journal April 2016
Structural Rearrangements of NR1/NR2A NMDA Receptors during Allosteric Inhibition journal January 2008
Structural Insights into Competitive Antagonism in NMDA Receptors journal January 2014
Zinc Dynamics and Action at Excitatory Synapses journal June 2014
Positive Allosteric Modulators of GluN2A-Containing NMDARs with Distinct Modes of Action and Impacts on Circuit Function journal March 2016
Functional evidence for a twisted conformation of the NMDA receptor GluN2A subunit N-terminal domain journal January 2011
Altered zinc sensitivity of NMDA receptors harboring clinically-relevant mutations journal October 2016
A structural biology perspective on NMDA receptor pharmacology and function journal August 2015
Discovery of GluN2A-Selective NMDA Receptor Positive Allosteric Modulators (PAMs): Tuning Deactivation Kinetics via Structure-Based Design journal March 2016
Micromolar concentrations of Zn2+ antagonize NMDA and GABA responses of hippocampal neurons journal August 1987
Structure of the zinc-bound amino-terminal domain of the NMDA receptor NR2B subunit journal November 2009
Molecular basis of positive allosteric modulation of GluN2B NMDA receptors by polyamines journal June 2011
Subunit arrangement and function in NMDA receptors journal November 2005
Mechanism of differential control of NMDA receptor activity by NR2 subunits journal April 2009
Subunit arrangement and phenylethanolamine binding in GluN1/GluN2B NMDA receptors journal June 2011
NMDA receptor structures reveal subunit arrangement and pore architecture journal June 2014
Activation of NMDA receptors and the mechanism of inhibition by ifenprodil journal May 2016
Zinc alleviates pain through high-affinity binding to the NMDA receptor NR2A subunit journal July 2011
Allosteric interaction between the amino terminal domain and the ligand binding domain of NR2A journal August 2001
Molecular determinants of coordinated proton and zinc inhibition of N-methyl-D-aspartate NR1/NR2A receptors journal September 2000
An Endoplasmic Reticulum Retention Signal Located in the Extracellular Amino-terminal Domain of the NR2A Subunit of N-Methyl-d-aspartate Receptors journal July 2009
Amino-terminal Domain Tetramer Organization and Structural Effects of Zinc Binding in the N-Methyl-d-aspartate (NMDA) Receptor journal August 2013
The Serine Protease Plasmin Cleaves the Amino-terminal Domain of the NR2A Subunit to Relieve Zinc Inhibition of the N-Methyl-d-aspartate Receptors journal May 2009
Structural Determinants of Agonist Efficacy at the Glutamate Binding Site of N -Methyl-d-Aspartate Receptors journal April 2013
Differential Sensitivity of Recombinant N -Methyl-d-Aspartate Receptor Subtypes to Zinc Inhibition journal June 1997
Glutamate Receptor Ion Channels: Structure, Regulation, and Function journal August 2010
Crystal structure of a heterotetrameric NMDA receptor ion channel journal May 2014
KVFinder: steered identification of protein cavities as a PyMOL plugin journal January 2014
Control of NMDA Receptor Function by the NR2 Subunit Amino-Terminal Domain journal September 2009
High-Affinity Zinc Inhibition of NMDA NR1–NR2A Receptors journal August 1997
Control of Voltage-Independent Zinc Inhibition of NMDA Receptors by the NR1 Subunit journal August 1998
C-Terminal Interaction Is Essential for Surface Trafficking But Not for Heteromeric Assembly of GABA B Receptors journal February 2001
The NMDA Receptor M3 Segment Is a Conserved Transduction Element Coupling Ligand Binding to Channel Opening journal March 2002
The Micromolar Zinc-Binding Domain on the NMDA Receptor Subunit NR2B journal January 2005

Cited By (16)

Lupus autoantibodies act as positive allosteric modulators at GluN2A-containing NMDA receptors and impair spatial memory journal March 2020
A NMDA-receptor calcium influx assay sensitive to stimulation by glutamate and glycine/D-serine journal September 2017
Structure, function, and allosteric modulation of NMDA receptors journal July 2018
Zinc mediates the neuronal activity–dependent anti-apoptotic effect journal August 2017
Marine Mammals’ NMDA Receptor Structure: Possible Adaptation to High Pressure Environment journal November 2018
Zinc in Cellular Regulation: The Nature and Significance of “Zinc Signals” journal October 2017
Plasma Membrane Na+-Coupled Citrate Transporter (SLC13A5) and Neonatal Epileptic Encephalopathy journal February 2017
Recent progress in allosteric modulators for GluN2A subunit and development of GluN2A-selective nuclear imaging probes journal June 2019
Removal of the Fe( iii ) site promotes activation of the human cystic fibrosis transmembrane conductance regulator by high-affinity Zn( ii ) binding journal January 2018
High affinity interactions of Pb 2+ with synaptotagmin I journal January 2018
Dissociated hippocampal neurons exhibit distinct Zn2+ dynamics in a stimulation method-dependent manner posted_content January 2020
High affinity interactions of Pb2+ with Synaptotagmin I posted_content June 2018
Lupus auto-antibodies act as positive allosteric modulators at NMDA receptors and induce spatial memory deficits posted_content October 2019
Properties of Triheteromeric N -Methyl-d-Aspartate Receptors Containing Two Distinct GluN1 Isoforms journal February 2018
Cryo-EM structures of the triheteromeric NMDA receptor and its allosteric modulation journal February 2017
An inter‐dimer allosteric switch controls NMDA receptor activity journal November 2018

Similar Records

Activation of NMDA receptors and the mechanism of inhibition by ifenprodil
Journal Article · Sun May 01 20:00:00 EDT 2016 · Nature (London) · OSTI ID:1352281

Structural basis of subunit selectivity for competitive NMDA receptor antagonists with preference for GluN2A over GluN2B subunits
Journal Article · Sun Jul 30 20:00:00 EDT 2017 · Proceedings of the National Academy of Sciences of the United States of America · OSTI ID:1400292

Structure of the Zinc-Bound Amino-Terminal Domain of the NMDA Receptor NR2B Subunit
Journal Article · Wed Dec 31 23:00:00 EST 2008 · EMBO Journal · OSTI ID:1019750