Mitochondrial outer membrane protein

Experimental Data Snapshot

  • Resolution: 3.50 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


Molecular insights into the human ABCB6 transporter.

Song, G.Zhang, S.Tian, M.Zhang, L.Guo, R.Zhuo, W.Yang, M.

(2021) Cell Discov 7: 55-55

  • DOI: https://doi.org/10.1038/s41421-021-00284-z
  • Primary Citation of Related Structures:  
    7EKL, 7EKM

  • PubMed Abstract: 

    ABCB6 plays a crucial role in energy-dependent porphyrin transport, drug resistance, toxic metal resistance, porphyrin biosynthesis, protection against stress, and encoding a blood group system Langereis antigen. However, the mechanism underlying porphyrin transport is still unclear. Here, we determined the cryo-electron microscopy (cryo-EM) structures of nanodisc-reconstituted human ABCB6 trapped in an apo-state and an ATP-bound state at resolutions of 3.6 and 3.5 Å, respectively. Our structures reveal a unique loop in the transmembrane domain (TMD) of ABCB6, which divides the TMD into two cavities. It restrains the access of substrates in the inward-facing state and is removed by ATP-driven conformational change. No ligand cavities were observed in the nucleotide-bound state, indicating a state following substrate release but prior to ATP hydrolysis. Structural analyses and functional characterizations suggest an "ATP-switch" model and further reveal the conformational changes of the substrate-binding pockets triggered by the ATP-driven regulation.

  • Organizational Affiliation

    Ministry of Education Key Laboratory of Protein Science, Tsinghua-Peking Center for Life Sciences, Beijing Advanced Innovation Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ATP-binding cassette sub-family B member 6
A, B
842Homo sapiensMutation(s): 1 
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9NP58 (Homo sapiens)
Explore Q9NP58 
Go to UniProtKB:  Q9NP58
GTEx:  ENSG00000115657 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9NP58
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

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

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

  • Released Date: 2021-08-25 
  • Deposition Author(s): Zhang, S.S.

Revision History  (Full details and data files)

  • Version 1.0: 2021-08-25
    Type: Initial release
  • Version 1.1: 2024-06-05
    Changes: Data collection