Structure of CtAtm1 in the inward-open with Glutathione-complexed [2Fe-2S] cluster bound

Experimental Data Snapshot

  • Resolution: 3.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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Structures of Atm1 provide insight into [2Fe-2S] cluster export from mitochondria.

Li, P.Hendricks, A.L.Wang, Y.Villones, R.L.E.Lindkvist-Petersson, K.Meloni, G.Cowan, J.A.Wang, K.Gourdon, P.

(2022) Nat Commun 13: 4339-4339

  • DOI: https://doi.org/10.1038/s41467-022-32006-8
  • Primary Citation of Related Structures:  
    7PQX, 7PR1, 7PRO, 7PRU, 7PSD

  • PubMed Abstract: 

    In eukaryotes, iron-sulfur clusters are essential cofactors for numerous physiological processes, but these clusters are primarily biosynthesized in mitochondria. Previous studies suggest mitochondrial ABCB7-type exporters are involved in maturation of cytosolic iron-sulfur proteins. However, the molecular mechanism for how the ABCB7-type exporters participate in this process remains elusive. Here, we report a series of cryo-electron microscopy structures of a eukaryotic homolog of human ABCB7, CtAtm1, determined at average resolutions ranging from 2.8 to 3.2 Å, complemented by functional characterization and molecular docking in silico. We propose that CtAtm1 accepts delivery from glutathione-complexed iron-sulfur clusters. A partially occluded state links cargo-binding to residues at the mitochondrial matrix interface that line a positively charged cavity, while the binding region becomes internalized and is partially divided in an early occluded state. Collectively, our findings substantially increase the understanding of the transport mechanism of eukaryotic ABCB7-type proteins.

  • Organizational Affiliation

    Department of Experimental Medical Science, Lund University, Sölvegatan 19, SE-221 84, Lund, Sweden.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative iron-sulfur protein
A, B
700Thermochaetoides thermophila DSM 1495Mutation(s): 1 
Gene Names: CTHT_0050000
Membrane Entity: Yes 
Find proteins for G0SBE6 (Chaetomium thermophilum (strain DSM 1495 / CBS 144.50 / IMI 039719))
Explore G0SBE6 
Go to UniProtKB:  G0SBE6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupG0SBE6
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Swedish Research CouncilDenmark2016-04474
Danish Council for Independent ResearchDenmark9039-00273

Revision History  (Full details and data files)

  • Version 1.0: 2022-08-10
    Type: Initial release