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- PDB-9p9g: Active substate 5 of the GluA4 homotetramer. -

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Basic information

Entry
Database: PDB / ID: 9p9g
TitleActive substate 5 of the GluA4 homotetramer.
Components
  • Isoform 2 of Glutamate receptor 4
  • Voltage-dependent calcium channel gamma-2 subunit
KeywordsMEMBRANE PROTEIN / AMPAR / Ion Channel / Glutamate Receptor / Ligand-gated
Function / homology
Function and homology information


Presynaptic depolarization and calcium channel opening / LGI-ADAM interactions / Trafficking of AMPA receptors / eye blink reflex / positive regulation of protein localization to basolateral plasma membrane / cerebellar mossy fiber / postsynaptic neurotransmitter receptor diffusion trapping / regulation of AMPA receptor activity / Trafficking of AMPA receptors / kainate selective glutamate receptor complex ...Presynaptic depolarization and calcium channel opening / LGI-ADAM interactions / Trafficking of AMPA receptors / eye blink reflex / positive regulation of protein localization to basolateral plasma membrane / cerebellar mossy fiber / postsynaptic neurotransmitter receptor diffusion trapping / regulation of AMPA receptor activity / Trafficking of AMPA receptors / kainate selective glutamate receptor complex / membrane hyperpolarization / regulation of synapse structure or activity / nervous system process / Synaptic adhesion-like molecules / protein targeting to membrane / voltage-gated calcium channel complex / neurotransmitter receptor localization to postsynaptic specialization membrane / Activation of AMPA receptors / neuromuscular junction development / AMPA glutamate receptor activity / Trafficking of GluR2-containing AMPA receptors / negative regulation of smooth muscle cell apoptotic process / transmission of nerve impulse / AMPA glutamate receptor complex / ionotropic glutamate receptor complex / membrane depolarization / Unblocking of NMDA receptors, glutamate binding and activation / positive regulation of synaptic transmission, glutamatergic / regulation of postsynaptic membrane neurotransmitter receptor levels / response to fungicide / voltage-gated calcium channel activity / glutamate-gated receptor activity / presynaptic active zone membrane / somatodendritic compartment / ionotropic glutamate receptor binding / ligand-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / hippocampal mossy fiber to CA3 synapse / regulation of membrane potential / transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential / synaptic transmission, glutamatergic / response to calcium ion / postsynaptic density membrane / modulation of chemical synaptic transmission / Schaffer collateral - CA1 synapse / terminal bouton / dendritic spine / chemical synaptic transmission / postsynaptic density / neuronal cell body / dendrite / synapse / glutamatergic synapse / cell surface / identical protein binding / plasma membrane
Similarity search - Function
Voltage-dependent calcium channel, gamma-2 subunit / : / PMP-22/EMP/MP20/Claudin family / Voltage-dependent calcium channel, gamma subunit / PMP-22/EMP/MP20/Claudin superfamily / Ionotropic glutamate receptor, metazoa / Ligated ion channel L-glutamate- and glycine-binding site / Ionotropic glutamate receptor, L-glutamate and glycine-binding domain / Ligated ion channel L-glutamate- and glycine-binding site / Ligand-gated ion channel ...Voltage-dependent calcium channel, gamma-2 subunit / : / PMP-22/EMP/MP20/Claudin family / Voltage-dependent calcium channel, gamma subunit / PMP-22/EMP/MP20/Claudin superfamily / Ionotropic glutamate receptor, metazoa / Ligated ion channel L-glutamate- and glycine-binding site / 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
CYCLOTHIAZIDE / GLUTAMIC ACID / Voltage-dependent calcium channel gamma-2 subunit / Glutamate receptor 4
Similarity search - Component
Biological speciesRattus norvegicus (Norway rat)
Mus musculus (house mouse)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.06 Å
AuthorsHale, W.D. / Huganir, R.L. / Twomey, E.C.
Funding support United States, 3items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Mental Health (NIH/NIMH)K99MH132811 United States
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)R37NS036715 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35GM154904 United States
CitationJournal: To Be Published
Title: Conformational Plasticity Tunes the GluA4 Channel Gate
Authors: Hale, W.D. / Huganir, R.L. / Twomey, E.C.
History
DepositionJun 24, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jan 28, 2026Provider: repository / Type: Initial release
Revision 1.0Jan 28, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Jan 28, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Jan 28, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Jan 28, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Jan 28, 2026Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Isoform 2 of Glutamate receptor 4
B: Isoform 2 of Glutamate receptor 4
C: Isoform 2 of Glutamate receptor 4
D: Isoform 2 of Glutamate receptor 4
H: Voltage-dependent calcium channel gamma-2 subunit
F: Voltage-dependent calcium channel gamma-2 subunit
G: Voltage-dependent calcium channel gamma-2 subunit
E: Voltage-dependent calcium channel gamma-2 subunit
hetero molecules


Theoretical massNumber of molelcules
Total (without water)474,97516
Polymers472,8278
Non-polymers2,1488
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

#1: Protein
Isoform 2 of Glutamate receptor 4 / GluR-4 / GluR4 / AMPA-selective glutamate receptor 4 / GluR-D / Glutamate receptor ionotropic / AMPA 4 / GluA4


Mass: 95140.234 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Rattus norvegicus (Norway rat) / Gene: Gria4, Glur4 / Production host: Homo sapiens (human) / References: UniProt: P19493
#2: Protein
Voltage-dependent calcium channel gamma-2 subunit / Neuronal voltage-gated calcium channel gamma-2 subunit / Stargazin / Transmembrane AMPAR regulatory ...Neuronal voltage-gated calcium channel gamma-2 subunit / Stargazin / Transmembrane AMPAR regulatory protein gamma-2 / TARP gamma-2


Mass: 23066.498 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Gene: Cacng2, Stg / Production host: Homo sapiens (human) / References: UniProt: O88602
#3: Chemical
ChemComp-GLU / GLUTAMIC ACID


Type: L-peptide linking / Mass: 147.129 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C5H9NO4
#4: Chemical
ChemComp-CYZ / CYCLOTHIAZIDE / 3-BICYCLO[2.2.1]HEPT-5-EN-2-YL-6-CHLORO-3,4- DIHYDRO-2H-1,2,4-BENZOTHIADIAZINE-7-SULFONAMIDE 1,1 DIOXIDE


Mass: 389.878 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C14H16ClN3O4S2
Has ligand of interestN
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: Octameric complex of four GluA4 subunits in complex with four TARP gamma 2 subunits.
Type: COMPLEX / Entity ID: #2, #1 / Source: RECOMBINANT
Source (natural)Organism: Rattus norvegicus (Norway rat)
Source (recombinant)Organism: Homo sapiens (human)
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: 2500 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 40 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

EM software
IDNameVersionCategory
1cryoSPARCparticle selection
2PHENIX1.21.2_5419model refinement
13cryoSPARC3D reconstruction
CTF correctionType: NONE
3D reconstructionResolution: 4.06 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 22575 / Symmetry type: POINT
RefinementHighest resolution: 4.06 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00518524
ELECTRON MICROSCOPYf_angle_d0.82125036
ELECTRON MICROSCOPYf_dihedral_angle_d8.6022508
ELECTRON MICROSCOPYf_chiral_restr0.1632800
ELECTRON MICROSCOPYf_plane_restr0.0083064

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