7R88

The structure of human ABCG5-I529W/ABCG8-WT


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


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Literature

Molecular basis of cholesterol efflux via ABCG subfamily transporters.

Sun, Y.Wang, J.Long, T.Qi, X.Donnelly, L.Elghobashi-Meinhardt, N.Esparza, L.Cohen, J.C.Xie, X.S.Hobbs, H.H.Li, X.

(2021) Proc Natl Acad Sci U S A 118

  • DOI: 10.1073/pnas.2110483118
  • Primary Citation of Related Structures:  
    7R87, 7R88, 7R89, 7R8A, 7R8B, 7R8C, 7R8D, 7R8E

  • PubMed Abstract: 
  • The ABCG1 homodimer (G1) and ABCG5-ABCG8 heterodimer (G5G8), two members of the adenosine triphosphate (ATP)-binding cassette (ABC) transporter G family, are required for maintenance of cellular cholesterol levels. G5G8 mediates secretion of neutral sterols into bile and the gut lumen, whereas G1 transports cholesterol from macrophages to high-density lipoproteins (HDLs) ...

    The ABCG1 homodimer (G1) and ABCG5-ABCG8 heterodimer (G5G8), two members of the adenosine triphosphate (ATP)-binding cassette (ABC) transporter G family, are required for maintenance of cellular cholesterol levels. G5G8 mediates secretion of neutral sterols into bile and the gut lumen, whereas G1 transports cholesterol from macrophages to high-density lipoproteins (HDLs). The mechanisms used by G5G8 and G1 to recognize and export sterols remain unclear. Here, we report cryoelectron microscopy (cryo-EM) structures of human G5G8 in sterol-bound and human G1 in cholesterol- and ATP-bound states. Both transporters have a sterol-binding site that is accessible from the cytosolic leaflet. A second site is present midway through the transmembrane domains of G5G8. The Walker A motif of G8 adopts a unique conformation that accounts for the marked asymmetry in ATPase activities between the two nucleotide-binding sites of G5G8. These structures, along with functional validation studies, provide a mechanistic framework for understanding cholesterol efflux via ABC transporters.


    Organizational Affiliation

    Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, TX 75390.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ATP-binding cassette sub-family G member 5A666Homo 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
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UniProt GroupQ9H222
Protein Feature View
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
ATP-binding cassette sub-family G member 8B715Homo 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
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UniProt GroupQ9H221
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
2C7 Fab heavy chainC245Mus musculusMutation(s): 0 
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
2C7 Fab light chainD234Mus musculusMutation(s): 0 
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States--
Welch FoundationUnited States--
Damon Runyon Cancer Research FoundationUnited States--

Revision History  (Full details and data files)

  • Version 1.0: 2021-09-08
    Type: Initial release