8QEY

Structure of human Asc1/CD98hc heteromeric amino acid transporter


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.00 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

Structure and mechanisms of transport of human Asc1/CD98hc amino acid transporter.

Rullo-Tubau, J.Martinez-Molledo, M.Bartoccioni, P.Puch-Giner, I.Arias, A.Saen-Oon, S.Stephan-Otto Attolini, C.Artuch, R.Diaz, L.Guallar, V.Errasti-Murugarren, E.Palacin, M.Llorca, O.

(2024) Nat Commun 15: 2986-2986

  • DOI: https://doi.org/10.1038/s41467-024-47385-3
  • Primary Citation of Related Structures:  
    8QEY

  • PubMed Abstract: 

    Recent cryoEM studies elucidated details of the structural basis for the substrate selectivity and translocation of heteromeric amino acid transporters. However, Asc1/CD98hc is the only neutral heteromeric amino acid transporter that can function through facilitated diffusion, and the only one that efficiently transports glycine and D-serine, and thus has a regulatory role in the central nervous system. Here we use cryoEM, ligand-binding simulations, mutagenesis, transport assays, and molecular dynamics to define human Asc1/CD98hc determinants for substrate specificity and gain insights into the mechanisms that govern substrate translocation by exchange and facilitated diffusion. The cryoEM structure of Asc1/CD98hc is determined at 3.4-3.8 Å resolution, revealing an inward-facing semi-occluded conformation. We find that Ser 246 and Tyr 333 are essential for Asc1/CD98hc substrate selectivity and for the exchange and facilitated diffusion modes of transport. Taken together, these results reveal the structural bases for ligand binding and transport features specific to human Asc1.


  • Organizational Affiliation

    Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology (BIST), Baldiri Reixac 10, E-08028, Barcelona, Spain.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Asc-type amino acid transporter 1523Homo sapiensMutation(s): 0 
Gene Names: SLC7A10ASC1
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9NS82 (Homo sapiens)
Explore Q9NS82 
Go to UniProtKB:  Q9NS82
PHAROS:  Q9NS82
GTEx:  ENSG00000130876 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9NS82
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
4F2 cell-surface antigen heavy chain630Homo 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
Glycosylation
Glycosylation Sites: 4Go to GlyGen: P08195-1
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
C, E
2N-Glycosylation
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Entity ID: 4
MoleculeChains Length2D Diagram Glycosylation3D Interactions
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
D
3N-Glycosylation
Glycosylation Resources
GlyTouCan:  G15407YE
GlyCosmos:  G15407YE
GlyGen:  G15407YE
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
La Caixa FoundationSpainLCF/PR/HR20/52400017

Revision History  (Full details and data files)

  • Version 1.0: 2024-04-10
    Type: Initial release
  • Version 1.1: 2024-04-17
    Changes: Database references
  • Version 1.2: 2024-10-16
    Changes: Data collection, Structure summary