Human excitatory amino acid transporter 3 (EAAT3) with bound potassium in an intermediate outward facing state

Experimental Data Snapshot

  • Resolution: 2.44 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


Symport and antiport mechanisms of human glutamate transporters.

Qiu, B.Boudker, O.

(2023) Nat Commun 14: 2579-2579

  • DOI: https://doi.org/10.1038/s41467-023-38120-5
  • Primary Citation of Related Structures:  
    8CTC, 8CTD, 8CUA, 8CUD, 8CUI, 8CUJ, 8CV2, 8CV3

  • PubMed Abstract: 

    Excitatory amino acid transporters (EAATs) uptake glutamate into glial cells and neurons. EAATs achieve million-fold transmitter gradients by symporting it with three sodium ions and a proton, and countertransporting a potassium ion via an elevator mechanism. Despite the availability of structures, the symport and antiport mechanisms still need to be clarified. We report high-resolution cryo-EM structures of human EAAT3 bound to the neurotransmitter glutamate with symported ions, potassium ions, sodium ions alone, or without ligands. We show that an evolutionarily conserved occluded translocation intermediate has a dramatically higher affinity for the neurotransmitter and the countertransported potassium ion than outward- or inward-facing transporters and plays a crucial role in ion coupling. We propose a comprehensive ion coupling mechanism involving a choreographed interplay between bound solutes, conformations of conserved amino acid motifs, and movements of the gating hairpin and the substrate-binding domain.

  • Organizational Affiliation

    Department of Physiology & Biophysics, Weill Cornell Medicine, 1300 York Ave, New York, NY, 10021, USA. biq2001@med.cornell.edu.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Excitatory amino acid transporter 3
A, B, C
526Homo sapiensMutation(s): 0 
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: 2.44 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)United StatesR37NS085318

Revision History  (Full details and data files)

  • Version 1.0: 2023-05-10
    Type: Initial release
  • Version 1.1: 2023-05-17
    Changes: Database references