Experimental Data Snapshot

  • Resolution: 3.03 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report

This is version 1.1 of the entry. See complete history


Cryo-EM structures of excitatory amino acid transporter 3 visualize coupled substrate, sodium, and proton binding and transport.

Qiu, B.Matthies, D.Fortea, E.Yu, Z.Boudker, O.

(2021) Sci Adv 7

  • DOI: https://doi.org/10.1126/sciadv.abf5814
  • Primary Citation of Related Structures:  
    6X2L, 6X2Z, 6X3E, 6X3F

  • PubMed Abstract: 

    Human excitatory amino acid transporter 3 (hEAAT3) mediates glutamate uptake in neurons, intestine, and kidney. Here, we report cryo-EM structures of hEAAT3 in several functional states where the transporter is empty, bound to coupled sodium ions only, or fully loaded with three sodium ions, a proton, and the substrate aspartate. The structures suggest that hEAAT3 operates by an elevator mechanism involving three functionally independent subunits. When the substrate-binding site is near the cytoplasm, it has a remarkably low affinity for the substrate, perhaps facilitating its release and allowing the rapid transport turnover. The mechanism of the coupled uptake of the sodium ions and the substrate is conserved across evolutionarily distant families and is augmented by coupling to protons in EAATs. The structures further suggest a mechanism by which a conserved glutamate residue mediates proton symport.

  • Organizational Affiliation

    Department of Physiology and Biophysics, Weill Cornell Medicine, 1300 York Ave, New York, NY 10021, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Excitatory amino acid transporter 3526Homo sapiensMutation(s): 2 
Gene Names: SLC1A1EAAC1EAAT3
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P43005 (Homo sapiens)
Explore P43005 
Go to UniProtKB:  P43005
PHAROS:  P43005
GTEx:  ENSG00000106688 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP43005
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.03 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)United StatesR01NS064357

Revision History  (Full details and data files)

  • Version 1.0: 2021-03-17
    Type: Initial release
  • Version 1.1: 2024-03-06
    Changes: Data collection, Database references