Crystal structure of human sugar transporter GLUT1 (SLC2A1) in the inward conformation

Experimental Data Snapshot

  • Resolution: 2.40 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.206 

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Structural comparison of GLUT1 to GLUT3 reveal transport regulation mechanism in sugar porter family.

Custodio, T.F.Paulsen, P.A.Frain, K.M.Pedersen, B.P.

(2021) Life Sci Alliance 4

  • DOI: https://doi.org/10.26508/lsa.202000858
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The human glucose transporters GLUT1 and GLUT3 have a central role in glucose uptake as canonical members of the Sugar Porter (SP) family. GLUT1 and GLUT3 share a fully conserved substrate-binding site with identical substrate coordination, but differ significantly in transport affinity in line with their physiological function. Here, we present a 2.4 Å crystal structure of GLUT1 in an inward open conformation and compare it with GLUT3 using both structural and functional data. Our work shows that interactions between a cytosolic "SP motif" and a conserved "A motif" stabilize the outward conformational state and increases substrate apparent affinity. Furthermore, we identify a previously undescribed Cl - ion site in GLUT1 and an endofacial lipid/glucose binding site which modulate GLUT kinetics. The results provide a possible explanation for the difference between GLUT1 and GLUT3 glucose affinity, imply a general model for the kinetic regulation in GLUTs and suggest a physiological function for the defining SP sequence motif in the SP family.

  • Organizational Affiliation

    Department of Molecular Biology and Genetics, Aarhus University, Aarhus C, Denmark.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Solute carrier family 2, facilitated glucose transporter member 1496Homo sapiensMutation(s): 0 
Gene Names: SLC2A1GLUT1
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P11166 (Homo sapiens)
Explore P11166 
Go to UniProtKB:  P11166
PHAROS:  P11166
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP11166
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.40 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.206 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 120α = 90
b = 102.18β = 98.89
c = 69γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Danish Council for Independent ResearchDenmarkDFF-4002-00052
European Research CouncilDenmark637372
Other privateDenmarkCF17-0180

Revision History  (Full details and data files)

  • Version 1.0: 2020-11-25
    Type: Initial release
  • Version 1.1: 2021-06-09
    Changes: Database references, Refinement description