Cryo-EM structure of ATP-bound ABCA3

Experimental Data Snapshot

  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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Cryo-EM structures of the human surfactant lipid transporter ABCA3.

Xie, T.Zhang, Z.Yue, J.Fang, Q.Gong, X.

(2022) Sci Adv 8: eabn3727-eabn3727

  • DOI: https://doi.org/10.1126/sciadv.abn3727
  • Primary Citation of Related Structures:  
    7W01, 7W02

  • PubMed Abstract: 

    The adenosine 5'-triphosphate (ATP)-binding cassette (ABC) transporter ABCA3 plays a critical role in pulmonary surfactant biogenesis. Mutations in human ABCA3 have been recognized as the most frequent causes of inherited surfactant dysfunction disorders. Despite two decades of research, in vitro biochemical and structural studies of ABCA3 are still lacking. Here, we report the cryo-EM structures of human ABCA3 in two distinct conformations, both at resolution of 3.3 Å. In the absence of ATP, ABCA3 adopts a "lateral-opening" conformation with the lateral surfaces of transmembrane domains (TMDs) exposed to the membrane and features two positively charged cavities within the TMDs as potential substrate binding sites. ATP binding induces pronounced conformational changes, resulting in the collapse of the potential substrate binding cavities. Our results help to rationalize the disease-causing mutations in human ABCA3 and suggest a conserved "lateral access and extrusion" mechanism for both lipid export and import mediated by ABCA transporters.

  • Organizational Affiliation

    Department of Biology, School of Life Sciences, Southern University of Science and Technology, Shenzhen 518055, Guangdong, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Phospholipid-transporting ATPase ABCA31,748Homo sapiensMutation(s): 2 
Gene Names: ABCA3ABC3
EC: (PDB Primary Data), (PDB Primary Data)
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q99758 (Homo sapiens)
Explore Q99758 
Go to UniProtKB:  Q99758
PHAROS:  Q99758
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ99758
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Not funded--

Revision History  (Full details and data files)

  • Version 1.0: 2022-04-20
    Type: Initial release