7OCD

Resting state GluA1/A2 heterotetramer in complex with auxiliary subunit TARP gamma 8 (LBD-TMD)

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

Gating and modulation of a hetero-octameric AMPA glutamate receptor.

Zhang, D., Watson, J.F., Matthews, P.M., Cais, O., Greger, I.H.

(2021) Nature 594: 454-458

  • DOI: 10.1038/s41586-021-03613-0
  • Primary Citation of Related Structures:  
    7OCA, 7OCC, 7OCD, 7OCE, 7OCF

  • PubMed Abstract: 

    • AMPA receptors (AMPARs) mediate the majority of excitatory transmission in the brain and enable the synaptic plasticity that underlies learning 1 . A diverse array of AMPAR signalling complexes are established by receptor auxiliary subunits, which associate with the AMPAR in various combinations to modulate trafficking, gating and synaptic strength 2 ...

    AMPA receptors (AMPARs) mediate the majority of excitatory transmission in the brain and enable the synaptic plasticity that underlies learning 1 . A diverse array of AMPAR signalling complexes are established by receptor auxiliary subunits, which associate with the AMPAR in various combinations to modulate trafficking, gating and synaptic strength 2 . However, their mechanisms of action are poorly understood. Here we determine cryo-electron microscopy structures of the heteromeric GluA1-GluA2 receptor assembled with both TARP-γ8 and CNIH2, the predominant AMPAR complex in the forebrain, in both resting and active states. Two TARP-γ8 and two CNIH2 subunits insert at distinct sites beneath the ligand-binding domains of the receptor, with site-specific lipids shaping each interaction and affecting the gating regulation of the AMPARs. Activation of the receptor leads to asymmetry between GluA1 and GluA2 along the ion conduction path and an outward expansion of the channel triggers counter-rotations of both auxiliary subunit pairs, promoting the active-state conformation. In addition, both TARP-γ8 and CNIH2 pivot towards the pore exit upon activation, extending their reach for cytoplasmic receptor elements. CNIH2 achieves this through its uniquely extended M2 helix, which has transformed this endoplasmic reticulum-export factor into a powerful AMPAR modulator that is capable of providing hippocampal pyramidal neurons with their integrative synaptic properties.

    Organizational Affiliation: 

    Neurobiology Division, MRC Laboratory of Molecular Biology, Cambridge, UK. ig@mrc-lmb.cam.ac.uk.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Isoform Flip of Glutamate receptor 1A,
B [auth C]		915Rattus norvegicusMutation(s): 0 
Gene Names: Gria1, Glur1
Membrane Entity: Yes 
UniProt
Find proteins for P19490 (Rattus norvegicus)
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UniProt GroupP19490
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Glutamate receptor 2F [auth B],
C [auth D]		860Rattus norvegicusMutation(s): 0 
Gene Names: Gria2, Glur2
Membrane Entity: Yes 
UniProt
Find proteins for P19491 (Rattus norvegicus)
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UniProt GroupP19491
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Voltage-dependent calcium channel gamma-8 subunitD [auth I],
E [auth J]		423Rattus norvegicusMutation(s): 0 
Gene Names: Cacng8
Membrane Entity: Yes 
UniProt
Find proteins for Q8VHW5 (Rattus norvegicus)
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UniProt GroupQ8VHW5
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Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PC1
Query on PC1
Download Ideal Coordinates CCD File 
H [auth A],
I [auth A],
K [auth C],
L [auth C],
N [auth D],
H [auth A],
I [auth A],
K [auth C],
L [auth C],
N [auth D],
P [auth B]
1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE
C44 H88 N O8 P
NRJAVPSFFCBXDT-HUESYALOSA-N		 Ligand Interaction
E2Q
Query on E2Q
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G [auth A],
J [auth C],
M [auth D],
O [auth B]		6-nitro-2,3-bis(oxidanylidene)-1,4-dihydrobenzo[f]quinoxaline-7-sulfonamide
C12 H8 N4 O6 S
UQNAFPHGVPVTAL-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Medical Research Council (MRC, United Kingdom)MC_U105174197
Biotechnology and Biological Sciences Research Council (BBSRC)BB/N002113/1

Revision History  (Full details and data files)

  • Version 1.0: 2021-06-09
    Type: Initial release
  • Version 1.1: 2021-06-16
    Changes: Database references
  • Version 1.2: 2021-06-30
    Changes: Database references