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- EMDB-45279: Diheteromeric GluN1/GluN2A (delM653) in nanodisc complexed with g... -

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Basic information

Entry
Database: EMDB / ID: EMD-45279
TitleDiheteromeric GluN1/GluN2A (delM653) in nanodisc complexed with glycine, glutamate, and GNE-4123, open conformation
Map data
Sample
  • Complex: Diheteromeric NMDA receptor GluN1/GluN2A in nanodisc, in complex with glycine, glutamate, and GNE-4123
    • Protein or peptide: x 2 types
  • Ligand: x 9 types
Keywordsion channel / NMDA / positive allosteric modulator / open pore conformation / TRANSPORT PROTEIN
Function / homology
Function and homology information


regulation of response to alcohol / response to ammonium ion / neurotransmitter receptor transport, plasma membrane to endosome / receptor recycling / response to environmental enrichment / directional locomotion / pons maturation / EPHB-mediated forward signaling / Assembly and cell surface presentation of NMDA receptors / regulation of cell communication ...regulation of response to alcohol / response to ammonium ion / neurotransmitter receptor transport, plasma membrane to endosome / receptor recycling / response to environmental enrichment / directional locomotion / pons maturation / EPHB-mediated forward signaling / Assembly and cell surface presentation of NMDA receptors / regulation of cell communication / auditory behavior / positive regulation of Schwann cell migration / olfactory learning / response to other organism / response to hydrogen sulfide / cellular response to magnesium ion / dendritic branch / conditioned taste aversion / response to methylmercury / protein localization to postsynaptic membrane / regulation of respiratory gaseous exchange / serotonin metabolic process / regulation of ARF protein signal transduction / response to manganese ion / transmitter-gated monoatomic ion channel activity / suckling behavior / positive regulation of inhibitory postsynaptic potential / sleep / cellular response to dsRNA / response to carbohydrate / propylene metabolic process / response to glycine / cellular response to lipid / regulation of NMDA receptor activity / dendritic spine organization / RAF/MAP kinase cascade / locomotion / response to amine / neurotransmitter receptor complex / Synaptic adhesion-like molecules / response to glycoside / regulation of monoatomic cation transmembrane transport / NMDA glutamate receptor activity / voltage-gated monoatomic cation channel activity / NMDA selective glutamate receptor complex / glutamate binding / ligand-gated sodium channel activity / glutamate receptor signaling pathway / neuromuscular process / regulation of axonogenesis / calcium ion transmembrane import into cytosol / response to morphine / regulation of dendrite morphogenesis / protein heterotetramerization / male mating behavior / regulation of synapse assembly / spinal cord development / glycine binding / startle response / positive regulation of reactive oxygen species biosynthetic process / cellular response to zinc ion / parallel fiber to Purkinje cell synapse / response to lithium ion / dopamine metabolic process / monoatomic ion channel complex / monoatomic cation transmembrane transport / regulation of postsynaptic membrane potential / action potential / positive regulation of calcium ion transport into cytosol / cellular response to glycine / modulation of excitatory postsynaptic potential / associative learning / positive regulation of dendritic spine maintenance / response to light stimulus / regulation of neuronal synaptic plasticity / social behavior / Unblocking of NMDA receptors, glutamate binding and activation / positive regulation of protein targeting to membrane / conditioned place preference / monoatomic cation transport / glutamate receptor binding / prepulse inhibition / ligand-gated monoatomic ion channel activity / neuron development / multicellular organismal response to stress / long-term memory / phosphatase binding / postsynaptic density, intracellular component / response to fungicide / monoatomic cation channel activity / synaptic cleft / calcium ion homeostasis / positive regulation of synaptic transmission, glutamatergic / glutamate-gated receptor activity / cellular response to manganese ion / glutamate-gated calcium ion channel activity / presynaptic active zone membrane / excitatory synapse / cell adhesion molecule binding / dendrite membrane
Similarity search - Function
Glutamate [NMDA] receptor, epsilon subunit, C-terminal / N-methyl D-aspartate receptor 2B3 C-terminus / : / : / Green fluorescent protein, GFP / Ionotropic glutamate receptor, metazoa / Green fluorescent protein-related / Green fluorescent protein / Ligated ion channel L-glutamate- and glycine-binding site / Green fluorescent protein ...Glutamate [NMDA] receptor, epsilon subunit, C-terminal / N-methyl D-aspartate receptor 2B3 C-terminus / : / : / Green fluorescent protein, GFP / Ionotropic glutamate receptor, metazoa / Green fluorescent protein-related / Green fluorescent protein / Ligated ion channel L-glutamate- and glycine-binding site / Green fluorescent protein / Ionotropic glutamate receptor, L-glutamate and glycine-binding domain / Ligated ion channel L-glutamate- and glycine-binding site / Ligand-gated ion channel / : / 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 / Green fluorescent protein / Glutamate receptor ionotropic, NMDA 2A
Similarity search - Component
Biological speciesRattus norvegicus (Norway rat) / Aequorea victoria (jellyfish)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsJalali-Yazdi F / Kim J / Gouaux E
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS) United States
CitationJournal: Sci Adv / Year: 2025
Title: Cryo-EM snapshots of NMDA receptor activation illuminate sequential rearrangements.
Authors: Jamie A Abbott / Junhoe Kim / Beiying Liu / Gabriela K Popescu / Eric Gouaux / Farzad Jalali-Yazdi /
Abstract: Canonical -methyl-d-aspartate receptors (NMDARs) are glutamate-gated ion channels with critical roles in the development and function of the nervous system. The excitatory currents they produce ...Canonical -methyl-d-aspartate receptors (NMDARs) are glutamate-gated ion channels with critical roles in the development and function of the nervous system. The excitatory currents they produce reflect stochastic transitions between multiple agonist-bound closed- and open-pore states. We leveraged the intrinsically high open probability () of NMDARs composed of GluN1 and GluN2A subunits, together with judiciously chosen mutants and ligands, to achieve conditions in which receptors had a near unity. Using single-particle cryo-electron microscopy (cryo-EM), we captured three activated receptor states, each with distinct conformations of the gate-forming M3 helices. Separately, we carried out single-channel electrophysiology, together with statistical modeling, to relate the cryo-EM structures to the gating reaction. NMDAR channel opening involves bending of the pore-forming M3 helices to produce a transient open-channel conformation, subsequently stabilized by new interactions between the D2-M3 linkers with the pre-M1 helices and the pre-M4 loops, to yield the stable open channel.
History
DepositionJun 10, 2024-
Header (metadata) releaseSep 24, 2025-
Map releaseSep 24, 2025-
UpdateFeb 4, 2026-
Current statusFeb 4, 2026Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_45279.png

Downloads & links

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Map

FileDownload / File: emd_45279.map.gz / Format: CCP4 / Size: 103 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.83 Å/pix.
x 300 pix.
= 247.8 Å		0.83 Å/pix.
x 300 pix.
= 247.8 Å		0.83 Å/pix.
x 300 pix.
= 247.8 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.826 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.28
Minimum - Maximum-1.0068063 - 1.9355556
Average (Standard dev.)0.00865416 (±0.081418276)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions300300300
Spacing300300300
CellA=B=C: 247.79999 Å
α=β=γ: 90.0 °

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Supplemental data

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Additional map: A map processed in C2 symmetry

Fileemd_45279_additional_1.map
AnnotationA map processed in C2 symmetry
Projections & Slices
AxesZYX

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Half map: #2

Fileemd_45279_half_map_1.map
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Half map: #1

Fileemd_45279_half_map_2.map
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Sample components

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Entire : Diheteromeric NMDA receptor GluN1/GluN2A in nanodisc, in complex ...

EntireName: Diheteromeric NMDA receptor GluN1/GluN2A in nanodisc, in complex with glycine, glutamate, and GNE-4123
Components
  • Complex: Diheteromeric NMDA receptor GluN1/GluN2A in nanodisc, in complex with glycine, glutamate, and GNE-4123
    • Protein or peptide: Glutamate receptor ionotropic, NMDA 1,Green fluorescent protein
    • Protein or peptide: Glutamate receptor ionotropic, NMDA 2A,Green fluorescent protein chimera
  • Ligand: 4-cyclohexyl-N-[(8R)-2-cyclopropyl-7-hydroxy-5-methyl[1,2,4]triazolo[1,5-a]pyrimidin-6-yl]benzene-1-sulfonamide
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: HEPTANE
  • Ligand: CHOLESTEROL HEMISUCCINATE
  • Ligand: GLYCINE
  • Ligand: DODECANE
  • Ligand: GLUTAMIC ACID
  • Ligand: DECANE
  • Ligand: HEXANE

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Supramolecule #1: Diheteromeric NMDA receptor GluN1/GluN2A in nanodisc, in complex ...

SupramoleculeName: Diheteromeric NMDA receptor GluN1/GluN2A in nanodisc, in complex with glycine, glutamate, and GNE-4123
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2
Source (natural)Organism: Rattus norvegicus (Norway rat)
Molecular weightTheoretical: 502 KDa

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Macromolecule #1: Glutamate receptor ionotropic, NMDA 1,Green fluorescent protein

MacromoleculeName: Glutamate receptor ionotropic, NMDA 1,Green fluorescent protein
type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Aequorea victoria (jellyfish)
Molecular weightTheoretical: 124.759219 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MSTMHLLTFA LLFSCSFARA ACDPKIVNIG AVLSTRKHEQ MFREAVNQAN KRHGSWKIQL NATSVTHKPN AIQMALSVCE DLISSQVYA ILVSHPPTPN DHFTPTPVSY TAGFYRIPVL GLTTRMSIYS DKSIHLSFLR TVPPYSHQSS VWFEMMRVYN W NHIILLVS ...String:
MSTMHLLTFA LLFSCSFARA ACDPKIVNIG AVLSTRKHEQ MFREAVNQAN KRHGSWKIQL NATSVTHKPN AIQMALSVCE DLISSQVYA ILVSHPPTPN DHFTPTPVSY TAGFYRIPVL GLTTRMSIYS DKSIHLSFLR TVPPYSHQSS VWFEMMRVYN W NHIILLVS DDHEGRAAQK RLETLLEERE SKAEKVLQFD PGTKNVTALL MEARELEARV IILSASEDDA ATVYRAAAML NM TGSGYVW LVGEREISGN ALRYAPDGII GLQLINGKNE SAHISDAVGV VAQAVHELLE KENITDPPRG CVGNTNIWKT GPL FKRVLM SSKYADGVTG RVEFNEDGDR KFANYSIMNL QNRKLVQVGI YNGTHVIPND RKIIWPGGET EKPRGYQMST RLKI VTIHQ EPFVYVKPTM SDGTCKEEFT VNGDPVKKVI CTGPNDTSPG SPRHTVPQCC YGFCIDLLIK LARTMNFTYE VHLVA DGKF GTQERVNNSN KKEWNGMMGE LLSGQADMIV APLTINNERA QYIEFSKPFK YQGLTILVKK EIPRSTLDSF MQPFQS TLW LLVGLSVHVV AVMLYLLDRF SPFGRFKVNS EEEEEDALTL SSAMWFSWGV LLNSGIGEGA PRSFSARILG MVWAGFA MI IVASYTANLA AFLVLDRPEE RITGINDPRL RNPSDKFIYA TVKQSSVDIY FRRQVELSTM YRHMEKHNYE SAAEAIQA V RDNKLHAFIW DSAVLEFEAS QKCDLVTTGE LFFRSGFGIG MRKDSPWKQN VSLSILKSHE NGFMEDLDKT WVRYQECDS RSNAPATLTF ENMAGVFMLV AGGIVAGIFL IFIEIAYKRH KDARRKQLVP RGSAAAAVSK GEELFTGVVP ILVELDGDVN GHKFSVSGE GEGDATYGKL TLKFICTTGK LPVPWPTLVT TLTYGVQCFS RYPDHMKQHD FFKSAMPEGY VQERTIFFKD D GNYKTRAE VKFEGDTLVN RIELKGIDFK EDGNILGHKL EYNYNSHNVY IMADKQKNGI KVNFKIRHNI EDGSVQLADH YQ QNTPIGD GPVLLPDNHY LSTQSKLSKD PNEKRDHMVL LEFVTAAGIT LGMDELYKSG LRSHHHHHHH H

UniProtKB: Glutamate receptor ionotropic, NMDA 1, Green fluorescent protein

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Macromolecule #2: Glutamate receptor ionotropic, NMDA 2A,Green fluorescent protein ...

MacromoleculeName: Glutamate receptor ionotropic, NMDA 2A,Green fluorescent protein chimera
type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Aequorea victoria (jellyfish)
Molecular weightTheoretical: 126.35618 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MGRLGYWTLL VLPALLVWRD PAQNAAAEKG PPALNIAVLL GHSHDVTERE LRNLWGPEQA TGLPLDVNVV ALLMNRTDPK SLITHVCDL MSGARIHGLV FGDDTDQEAV AQMLDFISSQ TFIPILGIHG GASMIMADKD PTSTFFQFGA SIQQQATVML K IMQDYDWH ...String:
MGRLGYWTLL VLPALLVWRD PAQNAAAEKG PPALNIAVLL GHSHDVTERE LRNLWGPEQA TGLPLDVNVV ALLMNRTDPK SLITHVCDL MSGARIHGLV FGDDTDQEAV AQMLDFISSQ TFIPILGIHG GASMIMADKD PTSTFFQFGA SIQQQATVML K IMQDYDWH VFSLVTTIFP GYRDFISFIK TTVDNSFVGW DMQNVITLDT SFEDAKTQVQ LKKIHSSVIL LYCSKDEAVL IL SEARSLG LTGYDFFWIV PSLVSGNTEL IPKEFPSGLI SVSYDDWDYS LEARVRDGLG ILTTAASSML EKFSYIPEAK ASC YGQAEK PETPLHTLHQ FMVNVTWDGK DLSFTEEGYQ VHPRLVVIVL NKDREWEKVG KWENQTLSLR HAVWPRYKSF SDCE PDDNH LSIVTLEEAP FVIVEDIDPL TETCVRNTVP CRKFVKINNS TNEGMNVKKC CKGFCIDILK KLSRTVKFTY DLYLV TNGK HGKKVNNVWN GMIGEVVYQR AVMAVGSLTI NEERSEVVDF SVPFVETGIS VMVSRSNGTV SPSAFLEPFS ASVWVM MFV MLLIVSAIAV FVFEYFSPVG YNRNLAKGKA PHGPSFTIGK AIWLLWGLVF NNSVPVQNPK GTTSKIMVSV WAFFAVI FL ASYTANLAAF IQEEFVDQVT GLSDKKFQRP HDYSPPFRFG TVPNGSTERN IRNNYPYMHQ YMTRFNQRGV EDALVSLK T GKLDAFIYDA AVLNYKAGRD EGCKLVTIGS GYIFATTGYG IALQKGSPWK RQIDLALLQF VGDGEMEELE TLWLTGICH NEKNEVMSSQ LDIDNMAGVF YMLAAAMALS LITFIWEHLF YWKLRFCFTG VCSDRPGLLF SISRGLVPRG SAAAAVSKGE ELFTGVVPI LVELDGDVNG HKFSVSGEGE GDATYGKLTL KFICTTGKLP VPWPTLVTTL TYGVQCFSRY PDHMKQHDFF K SAMPEGYV QERTIFFKDD GNYKTRAEVK FEGDTLVNRI ELKGIDFKED GNILGHKLEY NYNSHNVYIM ADKQKNGIKV NF KIRHNIE DGSVQLADHY QQNTPIGDGP VLLPDNHYLS TQSKLSKDPN EKRDHMVLLE FVTAAGITLG MDELYKSGLR SWS HPQFEK

UniProtKB: Glutamate receptor ionotropic, NMDA 2A, Green fluorescent protein

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Macromolecule #4: 4-cyclohexyl-N-[(8R)-2-cyclopropyl-7-hydroxy-5-methyl[1,2,4]triaz...

MacromoleculeName: 4-cyclohexyl-N-[(8R)-2-cyclopropyl-7-hydroxy-5-methyl[1,2,4]triazolo[1,5-a]pyrimidin-6-yl]benzene-1-sulfonamide
type: ligand / ID: 4 / Number of copies: 2 / Formula: A1AUV
Molecular weightTheoretical: 427.52 Da

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Macromolecule #5: 2-acetamido-2-deoxy-beta-D-glucopyranose

MacromoleculeName: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 5 / Number of copies: 24 / Formula: NAG
Molecular weightTheoretical: 221.208 Da
Chemical component information

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose

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Macromolecule #6: HEPTANE

MacromoleculeName: HEPTANE / type: ligand / ID: 6 / Number of copies: 1 / Formula: HP6
Molecular weightTheoretical: 100.202 Da
Chemical component information

ChemComp-HP6:
HEPTANE

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Macromolecule #7: CHOLESTEROL HEMISUCCINATE

MacromoleculeName: CHOLESTEROL HEMISUCCINATE / type: ligand / ID: 7 / Number of copies: 8 / Formula: Y01
Molecular weightTheoretical: 486.726 Da
Chemical component information

ChemComp-Y01:
CHOLESTEROL HEMISUCCINATE

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Macromolecule #8: GLYCINE

MacromoleculeName: GLYCINE / type: ligand / ID: 8 / Number of copies: 2 / Formula: GLY
Molecular weightTheoretical: 75.067 Da
Chemical component information

ChemComp-GLY:
GLYCINE

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Macromolecule #9: DODECANE

MacromoleculeName: DODECANE / type: ligand / ID: 9 / Number of copies: 2 / Formula: D12
Molecular weightTheoretical: 170.335 Da
Chemical component information

ChemComp-D12:
DODECANE

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Macromolecule #10: GLUTAMIC ACID

MacromoleculeName: GLUTAMIC ACID / type: ligand / ID: 10 / Number of copies: 2 / Formula: GLU
Molecular weightTheoretical: 147.129 Da
Chemical component information

ChemComp-GLU:
GLUTAMIC ACID

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Macromolecule #11: DECANE

MacromoleculeName: DECANE / type: ligand / ID: 11 / Number of copies: 2 / Formula: D10
Molecular weightTheoretical: 142.282 Da
Chemical component information

ChemComp-D10:
DECANE

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Macromolecule #12: HEXANE

MacromoleculeName: HEXANE / type: ligand / ID: 12 / Number of copies: 1 / Formula: HEX
Molecular weightTheoretical: 86.175 Da
Chemical component information

ChemComp-HEX:
HEXANE

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration2 mg/mL
BufferpH: 9
GridModel: Quantifoil R2/1 / Material: GOLD / Mesh: 300 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 60 sec. / Details: 15 mA
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 291 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 QUANTUM (4k x 4k) / Detector mode: COUNTING / Number real images: 8048 / Average exposure time: 1.8 sec. / Average electron dose: 53.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.0 µm / Nominal defocus min: 0.8 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 1460000
CTF correctionType: NONE
Startup modelType of model: INSILICO MODEL
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 179000
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC

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Atomic model buiding 1

RefinementSpace: REAL / Protocol: RIGID BODY FIT / Target criteria: Cross-correlation coefficient
Output model

PDB-9c7c:
Diheteromeric GluN1/GluN2A (delM653) in nanodisc complexed with glycine, glutamate, and GNE-4123, open conformation

PDB-9c7e:
Diheteromeric GluN1/GluN2A (delM653) in nanodisc complex with glycine, glutamate, and GNE-4123, open conformation, C2 symmetry

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