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 

wwPDB Validation 3D Report Full Report


This is version 1.3 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

  • 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 sitoster ...

    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

    Eugene McDermott Center for Human Growth and Development, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas 75390, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ATP-binding cassette sub-family G member 5
A, C
666Homo sapiensMutation(s): 1 
Gene Names: ABCG5
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
ATP Binding Cassette (ABC) Transporters
Protein: 
ABCG5/ABCG8 sterol transporter
Find proteins for Q9H222 (Homo sapiens)
Go to Gene View: ABCG5
Go to UniProtKB:  Q9H222
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
ATP-binding cassette sub-family G member 8
B, D
685Homo sapiensMutation(s): 0 
Gene Names: ABCG8
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
ATP Binding Cassette (ABC) Transporters
Protein: 
ABCG5/ABCG8 sterol transporter
Find proteins for Q9H221 (Homo sapiens)
Go to Gene View: ABCG8
Go to UniProtKB:  Q9H221
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.93 Å
  • R-Value Free: 0.329 
  • R-Value Work: 0.245 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 173.552α = 90.00
b = 224.804β = 90.00
c = 253.304γ = 90.00
Software Package:
Software NamePurpose
MLPHAREphasing
REFMACrefinement
HKL-3000data scaling
HKL-3000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Heart, Lung, and Blood InstituteUnited StatesHL72304
National Institutes of Health/National Heart, Lung, and Blood InstituteUnited StatesP01-HL20948
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM113050
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM053163
American Heart AssociationUnited States0825285F
American Heart AssociationUnited States0463130Y

Revision History 

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