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- PDB-7tnj: Complex NNNN of AMPA-subtype iGluR GluA2 in complex with auxiliar... -

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Basic information

Entry
Database: PDB / ID: 7tnj
TitleComplex NNNN of AMPA-subtype iGluR GluA2 in complex with auxiliary subunit gamma2 (Stargazin) at low glutamate concentration (20 uM) in the presence of cyclothiazide (100 uM)
ComponentsIsoform Flip of Glutamate receptor 2,Voltage-dependent calcium channel gamma-3 subunit chimera
KeywordsMEMBRANE PROTEIN / AMPA / iGluR / Stargazin / cryo-EM / complex / agonist / positive allosteric modulator / subconductance level / opening / gating / glutamate
Function / homology
Function and homology information


postsynaptic neurotransmitter receptor diffusion trapping / regulation of AMPA receptor activity / channel regulator activity / Trafficking of AMPA receptors / LGI-ADAM interactions / neurotransmitter receptor localization to postsynaptic specialization membrane / transmission of nerve impulse / AMPA glutamate receptor complex / excitatory synapse / positive regulation of synaptic transmission, glutamatergic ...postsynaptic neurotransmitter receptor diffusion trapping / regulation of AMPA receptor activity / channel regulator activity / Trafficking of AMPA receptors / LGI-ADAM interactions / neurotransmitter receptor localization to postsynaptic specialization membrane / transmission of nerve impulse / AMPA glutamate receptor complex / excitatory synapse / positive regulation of synaptic transmission, glutamatergic / protein targeting / voltage-gated calcium channel activity / somatodendritic compartment / ionotropic glutamate receptor binding / PDZ domain binding / postsynaptic density membrane / Schaffer collateral - CA1 synapse / intracellular protein localization / dendrite / glutamatergic synapse
Similarity search - Function
: / PMP-22/EMP/MP20/Claudin family / Voltage-dependent calcium channel, gamma subunit / PMP-22/EMP/MP20/Claudin superfamily
Similarity search - Domain/homology
CYCLOTHIAZIDE / Isoform Flip of Glutamate receptor 2 / Voltage-dependent calcium channel gamma-3 subunit
Similarity search - Component
Biological speciesRattus norvegicus (Norway rat)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.02 Å
AuthorsYelshanskaya, M.V. / Sobolevsky, A.I.
Funding support United States, 4items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)NS083660 United States
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)NS107253 United States
National Institutes of Health/National Cancer Institute (NIH/NCI)CA206573 United States
National Science Foundation (NSF, United States)1818086 United States
CitationJournal: Nature / Year: 2022
Title: Opening of glutamate receptor channel to subconductance levels.
Authors: Maria V Yelshanskaya / Dhilon S Patel / Christopher M Kottke / Maria G Kurnikova / Alexander I Sobolevsky /
Abstract: Ionotropic glutamate receptors (iGluRs) are tetrameric ligand-gated ion channels that open their pores in response to binding of the agonist glutamate. An ionic current through a single iGluR channel ...Ionotropic glutamate receptors (iGluRs) are tetrameric ligand-gated ion channels that open their pores in response to binding of the agonist glutamate. An ionic current through a single iGluR channel shows up to four discrete conductance levels (O1-O4). Higher conductance levels have been associated with an increased number of agonist molecules bound to four individual ligand-binding domains (LBDs). Here we determine structures of a synaptic complex of AMPA-subtype iGluR and the auxiliary subunit γ2 in non-desensitizing conditions with various occupancy of the LBDs by glutamate. We show that glutamate binds to LBDs of subunits B and D only after it is already bound to at least the same number of LBDs that belong to subunits A and C. Our structures combined with single-channel recordings, molecular dynamics simulations and machine-learning analysis suggest that channel opening requires agonist binding to at least two LBDs. Conversely, agonist binding to all four LBDs does not guarantee maximal channel conductance and favours subconductance states O1 and O2, with O3 and O4 being rare and not captured structurally. The lack of subunit independence and low efficiency coupling of glutamate binding to channel opening underlie the gating of synaptic complexes to submaximal conductance levels, which provide a potential for upregulation of synaptic activity.
History
DepositionJan 21, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0Apr 20, 2022Provider: repository / Type: Initial release
Revision 1.1May 4, 2022Group: Database references / Category: citation / citation_author / Item: _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.2May 18, 2022Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first / _citation.page_last
Revision 1.3Oct 30, 2024Group: Data collection / Structure summary
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update / _pdbx_entry_details.has_protein_modification

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Isoform Flip of Glutamate receptor 2,Voltage-dependent calcium channel gamma-3 subunit chimera
B: Isoform Flip of Glutamate receptor 2,Voltage-dependent calcium channel gamma-3 subunit chimera
C: Isoform Flip of Glutamate receptor 2,Voltage-dependent calcium channel gamma-3 subunit chimera
D: Isoform Flip of Glutamate receptor 2,Voltage-dependent calcium channel gamma-3 subunit chimera
hetero molecules


Theoretical massNumber of molelcules
Total (without water)463,3398
Polymers461,7804
Non-polymers1,5604
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein
Isoform Flip of Glutamate receptor 2,Voltage-dependent calcium channel gamma-3 subunit chimera / GluR-2 / AMPA-selective glutamate receptor 2 / GluR-B / GluR-K2 / Glutamate receptor ionotropic / ...GluR-2 / AMPA-selective glutamate receptor 2 / GluR-B / GluR-K2 / Glutamate receptor ionotropic / AMPA 2 / GluA2 / Neuronal voltage-gated calcium channel gamma-3 subunit / Transmembrane AMPAR regulatory protein gamma-3 / TARP gamma-3


Mass: 115444.922 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Rattus norvegicus (Norway rat) / Gene: Gria2, Glur2, Cacng3 / Production host: Homo sapiens (human) / References: UniProt: P19491-2, UniProt: Q8VHX0
#2: 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 / Feature type: SUBJECT OF INVESTIGATION
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: Ionotropic glutamate receptor GluA2 in complex with auxiliary subunit gamma2 or Stargazin
Type: COMPLEX / Entity ID: #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: FEI TITAN 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: 58.5 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING ONLY
3D reconstructionResolution: 4.02 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 49098 / Symmetry type: POINT

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