Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction | Predict Membrane 

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 398.79 kDa 
• Atom Count: 22081 
• Modelled Residue Count: 2762 
• Deposited Residue Count: 3528 
• Unique protein chains: 1

4UQQ

Electron density map of GluK2 desensitized state in complex with 2S,4R-4-methylglutamate

• PDB DOI: 10.2210/pdb4UQQ/pdb
• EM Map EMD-2685: EMDB EMDataResource

• Classification: TRANSPORT PROTEIN
• Organism(s): Rattus norvegicus
• Expression System: Spodoptera frugiperda
• Mutation(s): Yes 
• Membrane Protein: Yes  PDBTMMemProtMDmpstruc


• Deposited: 2014-06-24 Released: 2014-08-13 
• Deposition Author(s): Meyerson, J.R., Kumar, J., Chittori, S., Rao, P., Pierson, J., Bartesaghi, A., Mayer, M.L., Subramaniam, S.

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 7.60 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Structural Mechanism of Glutamate Receptor Activation and Desensitization

Meyerson, J.R., Kumar, J., Chittori, S., Rao, P., Pierson, J., Bartesaghi, A., Mayer, M.L., Subramaniam, S.

(2014) Nature 514: 328

• PubMed: 25119039 
• DOI: 10.1038/nature13603
• Primary Citation of Related Structures:  
  4UQ6, 4UQJ, 4UQK, 4UQQ


• PubMed Abstract: 
  

Ionotropic glutamate receptors are ligand-gated ion channels that mediate excitatory synaptic transmission in the vertebrate brain. To gain a better understanding of how structural changes gate ion flux across the membrane, we trapped rat AMPA (α-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid) and kainate receptor subtypes in their major functional states and analysed the resulting structures using cryo-electron microscopy. We show that transition to the active state involves a 'corkscrew' motion of the receptor assembly, driven by closure of the ligand-binding domain. Desensitization is accompanied by disruption of the amino-terminal domain tetramer in AMPA, but not kainate, receptors with a two-fold to four-fold symmetry transition in the ligand-binding domains in both subtypes. The 7.6 Å structure of a desensitized kainate receptor shows how these changes accommodate channel closing. These findings integrate previous physiological, biochemical and structural analyses of glutamate receptors and provide a molecular explanation for key steps in receptor gating.

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Organizational Affiliation: 

Laboratory of Cell Biology, Center for Cancer Research, NCI, NIH, Bethesda, Maryland 20892, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
GLUTAMATE RECEPTOR IONOTROPIC, KAINATE 2	A, B, C, D	882	Rattus norvegicus	Mutation(s): 4  Gene Names: Grik2, Glur6 Membrane Entity: Yes
UniProt
Find proteins for P42260 (Rattus norvegicus) Explore P42260  Go to UniProtKB:  P42260

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GLU	E [auth A], F [auth B], G [auth C], H [auth D]	GLUTAMIC ACID C5 H9 N O4 WHUUTDBJXJRKMK-VKHMYHEASA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 7.60 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2014-06-24 
• Released Date: 2014-08-13 
Deposition Author(s): Meyerson, J.R., Kumar, J., Chittori, S., Rao, P., Pierson, J., Bartesaghi, A., Mayer, M.L., Subramaniam, S.

Revision History  

• Version 1.0: 2014-08-13
  Type: Initial release
  
• Version 1.1: 2014-08-27
  Changes: Database references
• Version 1.2: 2014-10-22
  Changes: Database references
• Version 1.3: 2017-08-02
  Changes: Data collection