Crystal structure of GltPh fast mutant - R276S/M395R

Experimental Data Snapshot

  • Resolution: 4.05 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.224 

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Kinetic mechanism of coupled binding in sodium-aspartate symporter GltPh.

Oh, S.Boudker, O.

(2018) Elife 7

  • DOI: https://doi.org/10.7554/eLife.37291
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Many secondary active membrane transporters pump substrates against concentration gradients by coupling their uptake to symport of sodium ions. Symport requires the substrate and ions to be always transported together. Cooperative binding of the solutes is a key mechanism contributing to coupled transport in the sodium and aspartate symporter from Pyrococcus horikoshii Glt Ph . Here, we describe the kinetic mechanism of coupled binding for Glt Ph in the inward facing state. The first of the three coupled sodium ions, binds weakly and slowly, enabling the protein to accept the rest of the ions and the substrate. The last ion binds tightly, but is in rapid equilibrium with solution. Its release is required for the complex disassembly. Thus, the first ion serves to 'open the door' for the substrate, the last ion 'locks the door' once the substrate is in, and one ion contributes to both events.

  • Organizational Affiliation

    Howard Hughes Medical Institute, Chevy Chase, United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Glutamate transporter homolog
A, B, C
411Pyrococcus horikoshii OT3Mutation(s): 2 
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: 4.05 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.224 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 116.475α = 90
b = 196.42β = 90
c = 194.328γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
United States--

Revision History  (Full details and data files)

  • Version 1.0: 2018-10-10
    Type: Initial release
  • Version 1.1: 2018-10-31
    Changes: Data collection, Database references, Structure summary
  • Version 1.2: 2023-10-04
    Changes: Data collection, Database references, Refinement description