The structure of human ABCA1 in nanodisc

  • Classification: TRANSPORT PROTEIN
  • Organism(s): Homo sapiens
  • Expression System: Homo sapiens
  • Mutation(s): No 
  • Membrane Protein: Yes  OPMPDBTMMemProtMD

  • Deposited: 2021-12-22 Released: 2022-01-26 
  • Deposition Author(s): Sun, Y., Li, X.
  • Funding Organization(s): Damon Runyon Cancer Research Foundation, National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

Experimental Data Snapshot

  • Resolution: 4.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report

This is version 1.1 of the entry. See complete history


Cholesterol efflux mechanism revealed by structural analysis of human ABCA1 conformational states.

Sun, Y.Li, X.

(2022) Nat Cardiovasc Res 1: 238-245

  • DOI: https://doi.org/10.1038/s44161-022-00022-y
  • Primary Citation of Related Structures:  
    7TBW, 7TBY, 7TBZ, 7TC0

  • PubMed Abstract: 

    ATP-binding cassette transporter A1 (ABCA1) utilizes energy derived from ATP hydrolysis to export cholesterol and phospholipids from macrophages. ABCA1 plays a central role in the biosynthesis of high-density lipoprotein (HDL), which mediates reverse cholesterol transport and prevents detrimental lipid deposition. Mutations in ABCA1 cause Tangier disease characterized by a remarkable reduction in the amount of HDL in blood. Here we present cryo-electron microscopy structures of human ABCA1 in ATP-bound and nucleotide-free states. Structural comparison reveals that ATP molecules pull the nucleotide-binding domains together, inducing movements of transmembrane helices 1, 2, 7 and 8 through a series of salt-bridge interactions. Subsequently, extracellular domains (ECDs) undergo a rotation and introduce conformational changes in the ECD-transmembrane interface. In addition, while we observe a sterol-like molecule in ECDs, no such density was observed in the structure of an HDL-deficiency mutant ABCA1 Y482C , demonstrating the physiological importance of ECDs and a putative interaction mode between ABCA1 and its lipid acceptors. Thus, these structures, along with cholesterol efflux assays, advance the understanding ABCA1-mediated reverse cholesterol transport.

  • Organizational Affiliation

    Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ATP-binding cassette, sub-family A (ABC1), member 12,270Homo sapiensMutation(s): 0 
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for O95477 (Homo sapiens)
Explore O95477 
Go to UniProtKB:  O95477
PHAROS:  O95477
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO95477
Sequence Annotations
  • Reference Sequence


Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
Glycosylation Resources
GlyTouCan:  G89225LT
GlyCosmos:  G89225LT
GlyGen:  G89225LT
Experimental Data & Validation

Experimental Data

  • Resolution: 4.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

  • Released Date: 2022-01-26 
  • Deposition Author(s): Sun, Y., Li, X.

Funding OrganizationLocationGrant Number
Damon Runyon Cancer Research FoundationUnited StatesDRR-53S-19
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01GM135343

Revision History  (Full details and data files)

  • Version 1.0: 2022-01-26
    Type: Initial release
  • Version 1.1: 2023-05-24
    Changes: Database references