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- PDB-9unn: native NMDA receptor-GluN1/N2A-S3 in the closed state -

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Basic information

Entry
Database: PDB / ID: 9unn
Titlenative NMDA receptor-GluN1/N2A-S3 in the closed state
Components(Glutamate receptor ionotropic, NMDA ...) x 2
KeywordsMEMBRANE PROTEIN / native / NMDA receptor / inotropic ion channel / excitatory neurotransmitter
Function / homology
Function and homology information


Assembly and cell surface presentation of NMDA receptors / rhythmic process / EPHB-mediated forward signaling / Synaptic adhesion-like molecules / Unblocking of NMDA receptors, glutamate binding and activation / neurotransmitter receptor transport, plasma membrane to endosome / directional locomotion / receptor recycling / RAF/MAP kinase cascade / pons maturation ...Assembly and cell surface presentation of NMDA receptors / rhythmic process / EPHB-mediated forward signaling / Synaptic adhesion-like molecules / Unblocking of NMDA receptors, glutamate binding and activation / neurotransmitter receptor transport, plasma membrane to endosome / directional locomotion / receptor recycling / RAF/MAP kinase cascade / pons maturation / positive regulation of Schwann cell migration / protein localization to postsynaptic membrane / regulation of cell communication / conditioned taste aversion / sleep / serotonin metabolic process / suckling behavior / olfactory learning / monoatomic ion channel complex / dendritic branch / regulation of ARF protein signal transduction / positive regulation of mitochondrial calcium ion concentration / locomotion / transmitter-gated monoatomic ion channel activity / dendritic spine organization / regulation of respiratory gaseous exchange / propylene metabolic process / response to glycine / neurotransmitter receptor complex / positive regulation of inhibitory postsynaptic potential / regulation of NMDA receptor activity / NMDA glutamate receptor activity / regulation of monoatomic cation transmembrane transport / cellular response to zinc ion / neuromuscular process / NMDA selective glutamate receptor complex / glutamate binding / regulation of axonogenesis / ligand-gated sodium channel activity / startle response / voltage-gated monoatomic cation channel activity / regulation of synapse assembly / transport vesicle membrane / calcium ion transmembrane import into cytosol / response to morphine / positive regulation of reactive oxygen species biosynthetic process / dopamine metabolic process / male mating behavior / protein heterotetramerization / regulation of dendrite morphogenesis / glycine binding / glutamate receptor signaling pathway / response to lithium ion / parallel fiber to Purkinje cell synapse / positive regulation of calcium ion transport into cytosol / associative learning / regulation of neuronal synaptic plasticity / social behavior / regulation of postsynaptic membrane potential / action potential / modulation of excitatory postsynaptic potential / monoatomic cation transmembrane transport / positive regulation of dendritic spine maintenance / positive regulation of protein targeting to membrane / monoatomic cation transport / calcium ion homeostasis / glutamate receptor binding / prepulse inhibition / neurogenesis / long-term memory / adult locomotory behavior / phosphatase binding / regulation of long-term neuronal synaptic plasticity / postsynaptic density, intracellular component / monoatomic cation channel activity / response to amphetamine / glutamate-gated receptor activity / sensory perception of pain / positive regulation of synaptic transmission, glutamatergic / glutamate-gated calcium ion channel activity / cell adhesion molecule binding / presynaptic active zone membrane / visual learning / synaptic cleft / regulation of neuron apoptotic process / ionotropic glutamate receptor binding / excitatory synapse / ionotropic glutamate receptor signaling pathway / locomotory behavior / ligand-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / learning / dendrite membrane / protein tyrosine kinase binding / excitatory postsynaptic potential / cellular response to amino acid stimulus / hippocampal mossy fiber to CA3 synapse / positive regulation of excitatory postsynaptic potential / sodium ion transmembrane transport / response to wounding / synaptic membrane
Similarity search - Function
Glutamate [NMDA] receptor, epsilon subunit, C-terminal / N-methyl D-aspartate receptor 2B3 C-terminus / : / : / Ionotropic glutamate receptor, metazoa / Ligated ion channel L-glutamate- and glycine-binding site / Ligand-gated ion channel / Ionotropic glutamate receptor, L-glutamate and glycine-binding domain / Ligated ion channel L-glutamate- and glycine-binding site / : ...Glutamate [NMDA] receptor, epsilon subunit, C-terminal / N-methyl D-aspartate receptor 2B3 C-terminus / : / : / Ionotropic glutamate receptor, metazoa / Ligated ion channel L-glutamate- and glycine-binding site / Ligand-gated ion channel / Ionotropic glutamate receptor, L-glutamate and glycine-binding domain / Ligated ion channel L-glutamate- and glycine-binding site / : / Ionotropic glutamate receptor / Eukaryotic homologues of bacterial periplasmic substrate binding proteins. / Receptor, ligand binding region / Receptor family ligand binding region / Periplasmic binding protein-like I
Similarity search - Domain/homology
GLUTAMIC ACID / GLYCINE / Chem-JC9 / Glutamate receptor ionotropic, NMDA 2A / Glutamate receptor ionotropic, NMDA 1
Similarity search - Component
Biological speciesMus musculus (house mouse)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.29 Å
AuthorsYu, J. / Xu, R.S. / Ge, J.P.
Funding support China, 1items
OrganizationGrant numberCountry
Chinese Academy of Sciences China
CitationJournal: Nature / Year: 2026
Title: Conformational diversity and fully opening mechanism of native NMDA receptor.
Authors: Ruisheng Xu / Qiqi Jiang / Hongwei Xu / Lu Zhang / Xiangzi Hu / Zizhuo Lu / Huaqin Deng / Haolin Xiong / Sensen Zhang / Zhongwen Chen / Yifan Ge / Zhengjiang Zhu / Yaoyang Zhang / Yelin Chen ...Authors: Ruisheng Xu / Qiqi Jiang / Hongwei Xu / Lu Zhang / Xiangzi Hu / Zizhuo Lu / Huaqin Deng / Haolin Xiong / Sensen Zhang / Zhongwen Chen / Yifan Ge / Zhengjiang Zhu / Yaoyang Zhang / Yelin Chen / Jingpeng Ge / Jie Yu /
Abstract: N-methyl-D-aspartate receptors (NMDARs) are glutamate-gated ion channels that mediate excitatory neurotransmission throughout the brain. As obligate heterotetramers, their activation requires the ...N-methyl-D-aspartate receptors (NMDARs) are glutamate-gated ion channels that mediate excitatory neurotransmission throughout the brain. As obligate heterotetramers, their activation requires the binding of both glycine and glutamate. Although recent structural studies have provided insights into endogenous receptors from select brain regions, most previous work has relied on recombinant receptors and engineered constructs, which limits our understanding of native NMDARs across the whole brain. Here we identify and resolve ten distinct native NMDAR assemblies from the whole-brain tissue of female C57BL/6 mice using immunoaffinity purification, single-molecule total internal reflection fluorescence microscopy and cryo-electron microscopy. Analyses of the GluN1-GluN2A(S1), GluN1-GluN2A(S2), GluN1-GluN2A(S3), GluN1-GluN2B, GluN1-GluN2A-GluN2B(S1), GluN1-GluN2A-GluN2B(S2), GluN1-GluN2A-GluNX(S1), GluN1-GluN2A-GluNX(S2), GluN1-GluN2B-GluNX and GluN1-GluNX structures reveal that GluN2A is the most prevalent subunit across assemblies. Moreover, the substantial conformational flexibility observed in the GluN2A amino-terminal domain may explain its fast kinetics and dominant role in gating. Dynamic movements of S-ketamine were also captured at the channel vestibule, as was pore dilation in both the GluN1 and GluN2B subunits of a native GluN1-GluN2B receptor. The latter observation represents a previously unknown fully open state of NMDAR. Our large collection of heterogeneous NMDAR structures from whole brain reveals previously unrecognized properties of conformational diversity and channel dilation.
History
DepositionApr 24, 2025Deposition site: PDBJ / Processing site: PDBC
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Glutamate receptor ionotropic, NMDA 1
B: Glutamate receptor ionotropic, NMDA 2A
C: Glutamate receptor ionotropic, NMDA 1
D: Glutamate receptor ionotropic, NMDA 2A
hetero molecules


Theoretical massNumber of molelcules
Total (without water)372,34334
Polymers366,1314
Non-polymers6,21230
Water00
1


  • Idetical with deposited unit
  • defined by author&software
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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Glutamate receptor ionotropic, NMDA ... , 2 types, 4 molecules ACBD

#1: Protein Glutamate receptor ionotropic, NMDA 1 / GluN1 / Glutamate [NMDA] receptor subunit zeta-1 / N-methyl-D-aspartate receptor subunit NR1 / NMD-R1


Mass: 91838.938 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Mus musculus (house mouse) / References: UniProt: P35438
#2: Protein Glutamate receptor ionotropic, NMDA 2A / GluN2A / Glutamate [NMDA] receptor subunit epsilon-1 / N-methyl D-aspartate receptor subtype 2A / ...GluN2A / Glutamate [NMDA] receptor subunit epsilon-1 / N-methyl D-aspartate receptor subtype 2A / NMDAR2A / NR2A


Mass: 91226.312 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Mus musculus (house mouse) / References: UniProt: P35436

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Sugars , 1 types, 25 molecules

#3: Sugar...
ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 25 / Source method: obtained synthetically / Formula: C8H15NO6
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0

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Non-polymers , 3 types, 5 molecules

#4: Chemical ChemComp-GLY / GLYCINE


Type: peptide linking / Mass: 75.067 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C2H5NO2
#5: Chemical ChemComp-GLU / GLUTAMIC ACID


Type: L-peptide linking / Mass: 147.129 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C5H9NO4
#6: Chemical ChemComp-JC9 / (2~{S})-2-(2-chlorophenyl)-2-(methylamino)cyclohexan-1-one / Esketamine


Mass: 237.725 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C13H16ClNO / Feature type: SUBJECT OF INVESTIGATION

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Details

Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: native NMDA receptor-GluN1/N2A-S3 in the closed state / Type: COMPLEX / Entity ID: #1-#2 / Source: NATURAL
Source (natural)Organism: Mus musculus (house mouse)
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM software
IDNameVersionCategory
1RELIONparticle selection
2cryoSPARCparticle selection
3PHENIX1.20.1_4487model refinement
14cryoSPARC3D reconstruction
CTF correctionType: NONE
3D reconstructionResolution: 3.29 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 172255 / Symmetry type: POINT
RefinementHighest resolution: 3.29 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00323945
ELECTRON MICROSCOPYf_angle_d0.48332768
ELECTRON MICROSCOPYf_dihedral_angle_d3.7033479
ELECTRON MICROSCOPYf_chiral_restr0.0413985
ELECTRON MICROSCOPYf_plane_restr0.0034123

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