8CUB

Crystal Structure of ABCG5/G8 in Complex with Cholesterol


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.05 Å
  • R-Value Free: 0.303 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.249 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural Analysis of Cholesterol Binding and Sterol Selectivity by ABCG5/G8.

Farhat, D.Rezaei, F.Ristovski, M.Yang, Y.Stancescu, A.Dzimkova, L.Samnani, S.Couture, J.F.Lee, J.Y.

(2022) J Mol Biol 434: 167795-167795

  • DOI: 10.1016/j.jmb.2022.167795
  • Primary Citation of Related Structures:  
    8CUB

  • PubMed Abstract: 
  • The ATP-binding cassette (ABC) sterol transporters are responsible for maintaining cholesterol homeostasis in mammals by participating in reverse cholesterol transport (RCT) or transintestinal cholesterol efflux (TICE). The heterodimeric ABCG5/G8 carries out selective sterol excretion, preventing the abnormal accumulation of plant sterols in human bodies, while homodimeric ABCG1 contributes to the biogenesis and metabolism of high-density lipoproteins ...

    The ATP-binding cassette (ABC) sterol transporters are responsible for maintaining cholesterol homeostasis in mammals by participating in reverse cholesterol transport (RCT) or transintestinal cholesterol efflux (TICE). The heterodimeric ABCG5/G8 carries out selective sterol excretion, preventing the abnormal accumulation of plant sterols in human bodies, while homodimeric ABCG1 contributes to the biogenesis and metabolism of high-density lipoproteins. A sterol-binding site on ABCG5/G8 was proposed at the interface of the transmembrane domain and the core of lipid bilayers. In this study, we have determined the crystal structure of ABCG5/G8 in a cholesterol-bound state. The structure combined with amino acid sequence analysis shows that in the proximity of the sterol-binding site, a highly conserved phenylalanine array supports functional implications for ABCG cholesterol/sterol transporters. Lastly, in silico docking analysis of cholesterol and stigmasterol (a plant sterol) suggests sterol-binding selectivity on ABCG5/G8, but not ABCG1. Together, our results provide a structural basis for cholesterol binding on ABCG5/G8 and the sterol selectivity by ABCG transporters.


    Organizational Affiliation

    Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada. Electronic address: Jyh-Yeuan.Lee@uOttawa.ca.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ATP-binding cassette sub-family G member 5C [auth A],
A [auth C]
664Homo sapiensMutation(s): 0 
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 8D [auth B],
B [auth D]
687Homo 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
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CLR (Subject of Investigation/LOI)
Query on CLR

Download Ideal Coordinates CCD File 
E [auth C],
F [auth A]
CHOLESTEROL
C27 H46 O
HVYWMOMLDIMFJA-DPAQBDIFSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 173.268α = 90
b = 230.11β = 90
c = 249.819γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Natural Sciences and Engineering Research Council (NSERC, Canada)CanadaRGPIN 2018-04070
Canadian Institutes of Health Research (CIHR)CanadaPJT-180640

Revision History  (Full details and data files)

  • Version 1.0: 2022-08-31
    Type: Initial release
  • Version 1.1: 2022-09-07
    Changes: Structure summary
  • Version 1.2: 2022-09-14
    Changes: Database references