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- PDB-9pzx: GluN1/GluN2A in complex with 3D2 Fab, local ATD dimer -

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Basic information

Entry
Database: PDB / ID: 9pzx
TitleGluN1/GluN2A in complex with 3D2 Fab, local ATD dimer
Components
  • (Glutamate receptor ionotropic, NMDA ...) x 2
  • Heavy chain of GluN2A-specific monoclonal Fab fragment, termed 3D2
  • Light chain of GluN2A-specific monoclonal Fab fragment, termed 3D2
KeywordsTRANSPORT PROTEIN / ligand-gated ion channel / NMDA / antibody / complex
Function / homology
Function and homology information


regulation of response to alcohol / response to ammonium ion / response to environmental enrichment / neurotransmitter receptor transport, plasma membrane to endosome / directional locomotion / receptor recycling / auditory behavior / pons maturation / EPHB-mediated forward signaling / positive regulation of Schwann cell migration ...regulation of response to alcohol / response to ammonium ion / response to environmental enrichment / neurotransmitter receptor transport, plasma membrane to endosome / directional locomotion / receptor recycling / auditory behavior / pons maturation / EPHB-mediated forward signaling / positive regulation of Schwann cell migration / Assembly and cell surface presentation of NMDA receptors / regulation of cell communication / protein localization to postsynaptic membrane / conditioned taste aversion / response to carbohydrate / sleep / suckling behavior / cellular response to magnesium ion / olfactory learning / response to other organism / serotonin metabolic process / response to methylmercury / response to hydrogen sulfide / dendritic branch / regulation of ARF protein signal transduction / response to glycoside / locomotion / transmitter-gated monoatomic ion channel activity / response to manganese ion / cellular response to dsRNA / regulation of respiratory gaseous exchange / cellular response to lipid / propylene metabolic process / response to glycine / dendritic spine organization / RAF/MAP kinase cascade / positive regulation of inhibitory postsynaptic potential / neuromuscular process / neurotransmitter receptor complex / regulation of NMDA receptor activity / response to amine / Synaptic adhesion-like molecules / NMDA glutamate receptor activity / regulation of monoatomic cation transmembrane transport / cellular response to zinc ion / NMDA selective glutamate receptor complex / glutamate binding / spinal cord development / regulation of axonogenesis / ligand-gated sodium channel activity / startle response / voltage-gated monoatomic cation channel activity / response to morphine / calcium ion transmembrane import into cytosol / dopamine metabolic process / regulation of synapse assembly / male mating behavior / positive regulation of reactive oxygen species biosynthetic process / 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 / social behavior / regulation of neuronal synaptic plasticity / associative learning / neuron development / regulation of postsynaptic membrane potential / multicellular organismal response to stress / response to light stimulus / positive regulation of dendritic spine maintenance / monoatomic cation transmembrane transport / modulation of excitatory postsynaptic potential / action potential / cellular response to glycine / positive regulation of protein targeting to membrane / Unblocking of NMDA receptors, glutamate binding and activation / glutamate receptor binding / monoatomic cation transport / ligand-gated monoatomic ion channel activity / prepulse inhibition / conditioned place preference / neurogenesis / phosphatase binding / long-term memory / adult locomotory behavior / calcium ion homeostasis / regulation of long-term neuronal synaptic plasticity / postsynaptic density, intracellular component / response to fungicide / monoatomic cation channel activity / sensory perception of pain / glutamate-gated receptor activity / cellular response to manganese ion / positive regulation of synaptic transmission, glutamatergic / response to amphetamine / glutamate-gated calcium ion channel activity / presynaptic active zone 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
Glutamate receptor ionotropic, NMDA 1 / Glutamate receptor ionotropic, NMDA 2A
Similarity search - Component
Biological speciesRattus norvegicus (Norway rat)
Mus musculus (house mouse)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.76 Å
AuthorsKim, J. / Gouaux, E.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS) United States
CitationJournal: Sci Adv / Year: 2026
Title: Cryo-EM of autoantibody-bound NMDA receptors reveals antigenic hotspots in an active immunization model of anti-NMDAR encephalitis.
Authors: Junhoe Kim / Farzad Jalali-Yazdi / Brian E Jones / Gary L Westbrook / Eric Gouaux /
Abstract: Autoantibodies targeting synaptic membrane proteins are associated with autoimmune encephalitis manifested by seizures, psychosis, and memory dysfunction. Anti--methyl-d-aspartate receptor (NMDAR) ...Autoantibodies targeting synaptic membrane proteins are associated with autoimmune encephalitis manifested by seizures, psychosis, and memory dysfunction. Anti--methyl-d-aspartate receptor (NMDAR) encephalitis, a prototype of these autoimmune synaptic disorders, is unexpectedly common. Unfortunately, how the native repertoire of anti-NMDAR autoantibodies recognizes NMDARs and the precise locations of antigenic epitopes remain poorly understood. Here, we used an active immunization model that closely mimics the human disease to immunize adult mice with intact GluN1/GluN2A receptors, resulting in fulminant autoimmune encephalitis. Serum was collected at 6 weeks postimmunization for single-particle cryo-electron microscopy of GluN1/GluN2A receptors complexed with purified polyclonal anti-NMDAR autoantibody fragments. Native autoantibodies recognized two distinct binding sites on the GluN1 amino-terminal domain, which we confirmed using monoclonal antibodies bound to native NMDARs purified from mouse brain. Structural analysis of autoantibody-bound NMDAR complexes identified antigenic hotspots within the GluN1 amino-terminal domain. These hotspots provide potential targets for therapeutic intervention.
History
DepositionAug 11, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Dec 17, 2025Provider: repository / Type: Initial release
Revision 1.0Dec 17, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Dec 17, 2025Data content type: Additional map / Part number: 1 / Data content type: Additional map / Provider: repository / Type: Initial release
Revision 1.0Dec 17, 2025Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Dec 17, 2025Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Dec 17, 2025Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Dec 17, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Dec 17, 2025Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.1Feb 4, 2026Group: Data collection / Database references / Category: citation / citation_author / em_admin
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Revision 1.1Feb 4, 2026Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Database references / Experimental summary / Data content type: EM metadata / EM metadata / EM metadata / Category: citation / citation_author / em_admin
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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
J: Heavy chain of GluN2A-specific monoclonal Fab fragment, termed 3D2
K: Light chain of GluN2A-specific monoclonal Fab fragment, termed 3D2
hetero molecules


Theoretical massNumber of molelcules
Total (without water)223,2839
Polymers221,9744
Non-polymers1,3095
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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Glutamate receptor ionotropic, NMDA ... , 2 types, 2 molecules AB

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


Mass: 95372.164 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Rattus norvegicus (Norway rat) / Gene: Grin1, Nmdar1 / Production host: Homo sapiens (human) / References: UniProt: P35439
#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: 97163.359 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Rattus norvegicus (Norway rat) / Gene: Grin2a / Production host: Homo sapiens (human) / References: UniProt: Q00959

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Antibody , 2 types, 2 molecules JK

#3: Antibody Heavy chain of GluN2A-specific monoclonal Fab fragment, termed 3D2


Mass: 15448.522 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Production host: Homo sapiens (human)
#4: Antibody Light chain of GluN2A-specific monoclonal Fab fragment, termed 3D2


Mass: 13989.831 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Production host: Homo sapiens (human)

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Sugars , 2 types, 5 molecules

#5: Polysaccharide 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 424.401 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}LINUCSPDB-CARE
#6: 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.: 4 / Source method: obtained synthetically / Formula: C8H15NO6 / Feature type: SUBJECT OF INVESTIGATION
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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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: GluN1/GluN2A in complex with 3D2 Fab, local ATD dimer / Type: COMPLEX / Entity ID: #1-#4 / Source: RECOMBINANT
Molecular weightValue: 0.110 MDa / Experimental value: NO
Source (natural)Organism: Rattus norvegicus (Norway rat)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 8
SpecimenConc.: 0.05 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 290 K

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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: 3000 nm / Nominal defocus min: 1000 nm
Specimen holderCryogen: NITROGEN
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of real images: 6721
EM imaging opticsEnergyfilter name: GIF Bioquantum / Energyfilter slit width: 20 eV

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Processing

EM software
IDNameVersionCategory
1cryoSPARC4.4.0particle selection
9PHENIX1.20.model refinement
10cryoSPARC4.4.0initial Euler assignment
11cryoSPARC4.4.0final Euler assignment
13cryoSPARC4.4.03D reconstruction
CTF correctionType: NONE
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.76 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 366876 / Symmetry type: POINT
RefinementHighest resolution: 2.76 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)

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