7QHB

Active state of GluA1/2 in complex with TARP gamma 8, L-glutamate and CTZ


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 1.0 of the entry. See complete history


Literature

Mechanisms underlying TARP modulation of the GluA1/2-gamma 8 AMPA receptor.

Herguedas, B.Kohegyi, B.K.Dohrke, J.N.Watson, J.F.Zhang, D.Ho, H.Shaikh, S.A.Lape, R.Krieger, J.M.Greger, I.H.

(2022) Nat Commun 13: 734-734

  • DOI: 10.1038/s41467-022-28404-7
  • Primary Citation of Related Structures:  
    7QHB, 7QHH

  • PubMed Abstract: 
  • AMPA-type glutamate receptors (AMPARs) mediate rapid signal transmission at excitatory synapses in the brain. Glutamate binding to the receptor's ligand-binding domains (LBDs) leads to ion channel activation and desensitization. Gating kinetics shape synaptic transmission and are strongly modulated by transmembrane AMPAR regulatory proteins (TARPs) through currently incompletely resolved mechanisms ...

    AMPA-type glutamate receptors (AMPARs) mediate rapid signal transmission at excitatory synapses in the brain. Glutamate binding to the receptor's ligand-binding domains (LBDs) leads to ion channel activation and desensitization. Gating kinetics shape synaptic transmission and are strongly modulated by transmembrane AMPAR regulatory proteins (TARPs) through currently incompletely resolved mechanisms. Here, electron cryo-microscopy structures of the GluA1/2 TARP-γ8 complex, in both open and desensitized states (at 3.5 Å), reveal state-selective engagement of the LBDs by the large TARP-γ8 loop ('β1'), elucidating how this TARP stabilizes specific gating states. We further show how TARPs alter channel rectification, by interacting with the pore helix of the selectivity filter. Lastly, we reveal that the Q/R-editing site couples the channel constriction at the filter entrance to the gate, and forms the major cation binding site in the conduction path. Our results provide a mechanistic framework of how TARPs modulate AMPAR gating and conductance.


    Organizational Affiliation

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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Isoform Flip of Glutamate receptor 1A, C915Rattus norvegicusMutation(s): 0 
Gene Names: Gria1Glur1
Membrane Entity: Yes 
UniProt
Find proteins for P19490 (Rattus norvegicus)
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Go to UniProtKB:  P19490
Entity Groups  
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UniProt GroupP19490
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Isoform Flip of Glutamate receptor 2B, D860Rattus norvegicusMutation(s): 1 
Gene Names: Gria2Glur2
Membrane Entity: Yes 
UniProt
Find proteins for P19491 (Rattus norvegicus)
Explore P19491 
Go to UniProtKB:  P19491
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UniProt GroupP19491
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Voltage-dependent calcium channel gamma-8 subunitE [auth I],
F [auth J]
423Rattus norvegicusMutation(s): 0 
Gene Names: Cacng8
Membrane Entity: Yes 
UniProt
Find proteins for Q8VHW5 (Rattus norvegicus)
Explore Q8VHW5 
Go to UniProtKB:  Q8VHW5
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UniProt GroupQ8VHW5
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CYZ (Subject of Investigation/LOI)
Query on CYZ

Download Ideal Coordinates CCD File 
I [auth A],
N [auth B],
T [auth C],
X [auth D]
CYCLOTHIAZIDE
C14 H16 Cl N3 O4 S2
BOCUKUHCLICSIY-KSCJFIISSA-N
 Ligand Interaction
OLC
Query on OLC

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J [auth A],
U [auth C]
(2R)-2,3-dihydroxypropyl (9Z)-octadec-9-enoate
C21 H40 O4
RZRNAYUHWVFMIP-GDCKJWNLSA-N
 Ligand Interaction
79N
Query on 79N

Download Ideal Coordinates CCD File 
L [auth A],
O [auth B],
P [auth B],
Y [auth D]
(2S)-2,3-dihydroxypropyl (7Z)-hexadec-7-enoate
C19 H36 O4
OWGMAJRKMYGYBQ-LPADLIQXSA-N
 Ligand Interaction
PAM
Query on PAM

Download Ideal Coordinates CCD File 
AA [auth I],
BA [auth I],
CA [auth I],
DA [auth I],
EA [auth J],
AA [auth I],
BA [auth I],
CA [auth I],
DA [auth I],
EA [auth J],
FA [auth J],
G [auth A],
GA [auth J],
HA [auth J],
K [auth A],
Q [auth B],
R [auth C],
V [auth C],
Z [auth D]
PALMITOLEIC ACID
C16 H30 O2
SECPZKHBENQXJG-FPLPWBNLSA-N
 Ligand Interaction
GLU (Subject of Investigation/LOI)
Query on GLU

Download Ideal Coordinates CCD File 
H [auth A],
M [auth B],
S [auth C],
W [auth D]
GLUTAMIC ACID
C5 H9 N O4
WHUUTDBJXJRKMK-VKHMYHEASA-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)SpainMC_U105174197
Biotechnology and Biological Sciences Research Council (BBSRC)SpainBB/N002113/1
Spanish Ministry of Science, Innovation, and UniversitiesSpainPID2019-106284GA-I00

Revision History  (Full details and data files)

  • Version 1.0: 2022-02-23
    Type: Initial release