Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 4-mer - A1B1C1D1 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 4-mer - A2B2 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 207.56 kDa 
• Atom Count: 10,868 
• Modelled Residue Count: 1,371 
• Deposited Residue Count: 1,860 
• Unique protein chains: 4

 7R8B

The structure of human ABCG5/ABCG8 supplemented with cholesterol

• PDB DOI:  https://doi.org/10.2210/pdb7R8B/pdb
• EM Map EMD-24314: EMDB EMDataResource

• Classification: LIPID TRANSPORT
• Organism(s): Homo sapiens, Mus musculus
• Expression System: Komagataella pastoris, Mus musculus
• Mutation(s): No 
• Membrane Protein: Yes  OPMPDBTMMemProtMDmpstruc


• Deposited: 2021-06-26 Released: 2021-09-08 
• Deposition Author(s): Sun, Y., Li, X., Long, T.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS), Welch Foundation, Damon Runyon Cancer Research Foundation

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.10 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

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

• PubMed: 34404721 
• DOI: https://doi.org/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 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.

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ATP-binding cassette sub-family G member 5	A	666	Homo sapiens	Mutation(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 ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
ATP-binding cassette sub-family G member 8	B	715	Homo sapiens	Mutation(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 ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
2C7 Fab heavy chain	C	245	Mus musculus	Mutation(s): 0

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
2C7 Fab light chain	D	234	Mus musculus	Mutation(s): 0

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CLR (Subject of Investigation/LOI)	E [auth A], F [auth B]	CHOLESTEROL C27 H46 O HVYWMOMLDIMFJA-DPAQBDIFSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.10 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2021-09-08 
Deposition Author(s): Sun, Y., Li, X., Long, T.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	--
Welch Foundation	United States	--
Damon Runyon Cancer Research Foundation	United States	--

Revision History  

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