Thallium-bound inward-facing state of the glutamate transporter homologue GltPh

Experimental Data Snapshot

  • Resolution: 3.75 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.232 

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Coupled ion binding and structural transitions along the transport cycle of glutamate transporters.

Verdon, G.Oh, S.Serio, R.N.Boudker, O.

(2014) Elife 3: e02283-e02283

  • DOI: https://doi.org/10.7554/eLife.02283
  • Primary Citation of Related Structures:  
    4OYE, 4OYF, 4P19, 4P1A, 4P3J, 4P6H, 5CFY

  • PubMed Abstract: 

    Membrane transporters that clear the neurotransmitter glutamate from synapses are driven by symport of sodium ions and counter-transport of a potassium ion. Previous crystal structures of a homologous archaeal sodium and aspartate symporter showed that a dedicated transport domain carries the substrate and ions across the membrane. Here, we report new crystal structures of this homologue in ligand-free and ions-only bound outward- and inward-facing conformations. We show that after ligand release, the apo transport domain adopts a compact and occluded conformation that can traverse the membrane, completing the transport cycle. Sodium binding primes the transport domain to accept its substrate and triggers extracellular gate opening, which prevents inward domain translocation until substrate binding takes place. Furthermore, we describe a new cation-binding site ideally suited to bind a counter-transported ion. We suggest that potassium binding at this site stabilizes the translocation-competent conformation of the unloaded transport domain in mammalian homologues.DOI: http://dx.doi.org/10.7554/eLife.02283.001.

  • Organizational Affiliation

    Department of Pharmacology, Weill Cornell Medical College, New York, United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C
422Pyrococcus horikoshii OT3Mutation(s): 10 
Gene Names: PH1295
Membrane Entity: Yes 
Find proteins for O59010 (Pyrococcus horikoshii (strain ATCC 700860 / DSM 12428 / JCM 9974 / NBRC 100139 / OT-3))
Explore O59010 
Go to UniProtKB:  O59010
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO59010
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.75 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.232 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 106.979α = 90
b = 196.564β = 90
c = 206.499γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-06-04
    Type: Initial release