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- EMDB-45285: Diheteromeric GluN1/GluN2A (M817V) in digitonin complexed with gl... -

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Basic information

Entry
Database: EMDB / ID: EMD-45285
TitleDiheteromeric GluN1/GluN2A (M817V) in digitonin complexed with glycine, glutamate, and GNE-4123
Map data
Sample
  • Complex: Diheteromeric GluN1/GluN2A (M817V), in complex with glycine, glutamate, and GNE-4123
    • Protein or peptide: Glutamate receptor ionotropic, NMDA 1, Green fluorescent protein chimera
    • Protein or peptide: Glutamate receptor ionotropic, NMDA 2A, Green fluorescent protein chimera
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
Keywordsion channel / NMDA / positive allosteric modulator / pre-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 / EPHB-mediated forward signaling / pons maturation / Assembly and cell surface presentation of NMDA receptors / response to hydrogen sulfide ...regulation of response to alcohol / response to ammonium ion / neurotransmitter receptor transport, plasma membrane to endosome / receptor recycling / response to environmental enrichment / directional locomotion / EPHB-mediated forward signaling / pons maturation / Assembly and cell surface presentation of NMDA receptors / response to hydrogen sulfide / regulation of cell communication / auditory behavior / positive regulation of Schwann cell migration / olfactory learning / conditioned taste aversion / response to other organism / cellular response to magnesium ion / dendritic branch / regulation of respiratory gaseous exchange / response to methylmercury / protein localization to postsynaptic membrane / serotonin metabolic process / regulation of ARF protein signal transduction / response to manganese ion / response to carbohydrate / transmitter-gated monoatomic ion channel activity / suckling behavior / positive regulation of inhibitory postsynaptic potential / sleep / cellular response to dsRNA / propylene metabolic process / response to glycine / regulation of NMDA receptor activity / cellular response to lipid / locomotion / dendritic spine organization / RAF/MAP kinase cascade / response to amine / Synaptic adhesion-like molecules / regulation of monoatomic cation transmembrane transport / NMDA glutamate receptor activity / response to glycoside / NMDA selective glutamate receptor complex / voltage-gated monoatomic cation channel activity / glutamate binding / neurotransmitter receptor complex / ligand-gated sodium channel activity / glutamate receptor signaling pathway / regulation of axonogenesis / calcium ion transmembrane import into cytosol / neuromuscular process / response to morphine / regulation of dendrite morphogenesis / protein heterotetramerization / male mating behavior / regulation of synapse assembly / spinal cord development / glycine binding / startle response / cellular response to zinc ion / dopamine metabolic process / positive regulation of reactive oxygen species biosynthetic process / parallel fiber to Purkinje cell synapse / response to lithium ion / monoatomic cation transmembrane transport / monoatomic ion channel complex / cellular response to glycine / positive regulation of calcium ion transport into cytosol / regulation of postsynaptic membrane potential / response to light stimulus / action potential / modulation of excitatory postsynaptic potential / associative learning / positive regulation of dendritic spine maintenance / conditioned place preference / regulation of neuronal synaptic plasticity / social behavior / positive regulation of protein targeting to membrane / Unblocking of NMDA receptors, glutamate binding and activation / monoatomic cation transport / glutamate receptor binding / prepulse inhibition / long-term memory / neuron development / multicellular organismal response to stress / phosphatase binding / positive regulation of synaptic transmission, glutamatergic / postsynaptic density, intracellular component / response to fungicide / monoatomic cation channel activity / synaptic cleft / calcium ion homeostasis / glutamate-gated receptor activity / cellular response to manganese ion / glutamate-gated calcium ion channel activity / neurogenesis / presynaptic active zone membrane / cell adhesion molecule binding / dendrite membrane / excitatory synapse
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 / Ligated ion channel L-glutamate- and glycine-binding site / Green fluorescent protein-related / Ionotropic glutamate receptor, L-glutamate and glycine-binding domain / 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 / Ligated ion channel L-glutamate- and glycine-binding site / Green fluorescent protein-related / Ionotropic glutamate receptor, L-glutamate and glycine-binding domain / Green fluorescent protein / Ligated ion channel L-glutamate- and glycine-binding site / Ligand-gated ion channel / Green fluorescent protein / : / 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: 3.99 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 11, 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_45285.png

Downloads & links

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Map

FileDownload / File: emd_45285.map.gz / Format: CCP4 / Size: 103 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
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Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.82 Å/pix.
x 300 pix.
= 246.9 Å		0.82 Å/pix.
x 300 pix.
= 246.9 Å		0.82 Å/pix.
x 300 pix.
= 246.9 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.823 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.25
Minimum - Maximum-0.6487406 - 1.2146982
Average (Standard dev.)0.0107661635 (±0.06152376)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions300300300
Spacing300300300
CellA=B=C: 246.90001 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_45285_half_map_1.map
Projections & Slices
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Histogram (log scale)

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Half map: #2

Fileemd_45285_half_map_2.map
Projections & Slices
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Sample components

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Entire : Diheteromeric GluN1/GluN2A (M817V), in complex with glycine, glut...

EntireName: Diheteromeric GluN1/GluN2A (M817V), in complex with glycine, glutamate, and GNE-4123
Components
  • Complex: Diheteromeric GluN1/GluN2A (M817V), in complex with glycine, glutamate, and GNE-4123
    • Protein or peptide: Glutamate receptor ionotropic, NMDA 1, Green fluorescent protein chimera
    • Protein or peptide: Glutamate receptor ionotropic, NMDA 2A, Green fluorescent protein chimera
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose

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Supramolecule #1: Diheteromeric GluN1/GluN2A (M817V), in complex with glycine, glut...

SupramoleculeName: Diheteromeric GluN1/GluN2A (M817V), 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 chimera
type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Rattus norvegicus (Norway rat)
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: 126.45532 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 MIQEEFVDQV TGLSDKKFQR PHDYSPPFRF GTVPNGSTER NIRNNYPYMH QYMTRFNQRG VEDALVSL K TGKLDAFIYD AAVLNYKAGR DEGCKLVTIG SGYIFATTGY GIALQKGSPW KRQIDLALLQ FVGDGEMEEL ETLWLTGIC HNEKNEVMSS QLDIDNVAGV FYMLAAAMAL SLITFIWEHL FYWKLRFCFT GVCSDRPGLL FSISRGLVPR GSAAAAVSKG EELFTGVVP ILVELDGDVN GHKFSVSGEG EGDATYGKLT LKFICTTGKL PVPWPTLVTT LTYGVQCFSR YPDHMKQHDF F KSAMPEGY VQERTIFFKD DGNYKTRAEV KFEGDTLVNR IELKGIDFKE DGNILGHKLE YNYNSHNVYI MADKQKNGIK VN FKIRHNI EDGSVQLADH YQQNTPIGDG PVLLPDNHYL STQSKLSKDP NEKRDHMVLL EFVTAAGITL GMDELYKSGL RSW SHPQFE K

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

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Macromolecule #4: 2-acetamido-2-deoxy-beta-D-glucopyranose

MacromoleculeName: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 4 / Number of copies: 15 / Formula: NAG
Molecular weightTheoretical: 221.208 Da
Chemical component information

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

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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

Concentration4 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: 18873 / Average exposure time: 2.2 sec. / Average electron dose: 55.0 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: 3850000
CTF correctionType: NONE
Startup modelType of model: INSILICO MODEL
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.99 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 431000
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-9c7r:
Diheteromeric GluN1/GluN2A (M817V) in digitonin complexed with glycine, glutamate, and GNE-4123

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