5DO7

Crystal Structure of the Human Sterol Transporter ABCG5/ABCG8


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.93 Å
  • R-Value Free: 0.329 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.250 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Crystal structure of the human sterol transporter ABCG5/ABCG8.

Lee, J.Y.Kinch, L.N.Borek, D.M.Wang, J.Wang, J.Urbatsch, I.L.Xie, X.S.Grishin, N.V.Cohen, J.C.Otwinowski, Z.Hobbs, H.H.Rosenbaum, D.M.

(2016) Nature 533: 561-564

  • DOI: 10.1038/nature17666
  • Primary Citation of Related Structures:  
    5DO7

  • PubMed Abstract: 
  • ATP binding cassette (ABC) transporters play critical roles in maintaining sterol balance in higher eukaryotes. The ABCG5/ABCG8 heterodimer (G5G8) mediates excretion of neutral sterols in liver and intestines. Mutations disrupting G5G8 cause sitosterolaemia, a disorder characterized by sterol accumulation and premature atherosclerosis ...

    ATP binding cassette (ABC) transporters play critical roles in maintaining sterol balance in higher eukaryotes. The ABCG5/ABCG8 heterodimer (G5G8) mediates excretion of neutral sterols in liver and intestines. Mutations disrupting G5G8 cause sitosterolaemia, a disorder characterized by sterol accumulation and premature atherosclerosis. Here we use crystallization in lipid bilayers to determine the X-ray structure of human G5G8 in a nucleotide-free state at 3.9 Å resolution, generating the first atomic model of an ABC sterol transporter. The structure reveals a new transmembrane fold that is present in a large and functionally diverse superfamily of ABC transporters. The transmembrane domains are coupled to the nucleotide-binding sites by networks of interactions that differ between the active and inactive ATPases, reflecting the catalytic asymmetry of the transporter. The G5G8 structure provides a mechanistic framework for understanding sterol transport and the disruptive effects of mutations causing sitosterolaemia.


    Organizational Affiliation

    Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ATP-binding cassette sub-family G member 5A,
D [auth C]
666Homo sapiensMutation(s): 1 
Gene Names: ABCG5
EC: 7.6.2
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9H222 (Homo sapiens)
Explore Q9H222 
Go to UniProtKB:  Q9H222
PHAROS:  Q9H222
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9H222
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
ATP-binding cassette sub-family G member 8B,
C [auth D]
685Homo sapiensMutation(s): 0 
Gene Names: ABCG8
EC: 7.6.2
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9H221 (Homo sapiens)
Explore Q9H221 
Go to UniProtKB:  Q9H221
PHAROS:  Q9H221
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9H221
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.93 Å
  • R-Value Free: 0.329 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.250 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 173.552α = 90
b = 224.804β = 90
c = 253.304γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-3000data reduction
HKL-3000data scaling
MLPHAREphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)United StatesHL72304
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)United StatesP01-HL20948
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM113050
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM053163
American Heart AssociationUnited States0825285F
American Heart AssociationUnited States0463130Y

Revision History  (Full details and data files)

  • Version 1.0: 2016-05-11
    Type: Initial release
  • Version 1.1: 2016-05-25
    Changes: Database references
  • Version 1.2: 2016-06-08
    Changes: Database references
  • Version 1.3: 2017-09-27
    Changes: Author supporting evidence, Database references, Derived calculations
  • Version 1.4: 2019-12-04
    Changes: Author supporting evidence