7P9U

Cryo EM structure of System XC- in complex with glutamate


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.70 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Molecular basis for redox control by the human cystine/glutamate antiporter system xc .

Parker, J.L.Deme, J.C.Kolokouris, D.Kuteyi, G.Biggin, P.C.Lea, S.M.Newstead, S.

(2021) Nat Commun 12: 7147-7147

  • DOI: https://doi.org/10.1038/s41467-021-27414-1
  • Primary Citation of Related Structures:  
    7P9U, 7P9V

  • PubMed Abstract: 

    Cysteine plays an essential role in cellular redox homoeostasis as a key constituent of the tripeptide glutathione (GSH). A rate limiting step in cellular GSH synthesis is the availability of cysteine. However, circulating cysteine exists in the blood as the oxidised di-peptide cystine, requiring specialised transport systems for its import into the cell. System xc - is a dedicated cystine transporter, importing cystine in exchange for intracellular glutamate. To counteract elevated levels of reactive oxygen species in cancerous cells system xc - is frequently upregulated, making it an attractive target for anticancer therapies. However, the molecular basis for ligand recognition remains elusive, hampering efforts to specifically target this transport system. Here we present the cryo-EM structure of system xc - in both the apo and glutamate bound states. Structural comparisons reveal an allosteric mechanism for ligand discrimination, supported by molecular dynamics and cell-based assays, establishing a mechanism for cystine transport in human cells.


  • Organizational Affiliation

    Department of Biochemistry, University of Oxford, Oxford, OX1 3QU, UK. joanne.parker@bioch.ox.ac.uk.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
4F2 cell-surface antigen heavy chain638Homo sapiensMutation(s): 0 
Gene Names: SLC3A2MDU1
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P08195 (Homo sapiens)
Explore P08195 
Go to UniProtKB:  P08195
PHAROS:  P08195
GTEx:  ENSG00000168003 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP08195
Sequence Annotations
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Cystine/glutamate transporter509Homo sapiensMutation(s): 0 
Gene Names: SLC7A11
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UPY5 (Homo sapiens)
Explore Q9UPY5 
Go to UniProtKB:  Q9UPY5
PHAROS:  Q9UPY5
GTEx:  ENSG00000151012 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9UPY5
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.70 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Wellcome TrustUnited Kingdom201536
Wolfson FoundationUnited KingdomWL160052
Engineering and Physical Sciences Research CouncilUnited KingdomEP/L000253/1
Wellcome TrustUnited Kingdom209194
Wellcome TrustUnited Kingdom100298
Wellcome TrustUnited Kingdom219531
Wellcome TrustUnited Kingdom215519
Wellcome TrustUnited Kingdom219531
Medical Research Council (MRC, United Kingdom)United KingdomMR/M011984/1
Medical Research Council (MRC, United Kingdom)United KingdomMR/S021043/1

Revision History  (Full details and data files)

  • Version 1.0: 2021-11-17
    Type: Initial release
  • Version 1.1: 2022-02-02
    Changes: Database references
  • Version 1.2: 2024-11-13
    Changes: Data collection, Structure summary