Structure of the Apo1 state of the heptameric Bcs1 AAA-ATPase.

Experimental Data Snapshot

  • Resolution: 4.40 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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Structure of the Bcs1 AAA-ATPase suggests an airlock-like translocation mechanism for folded proteins.

Kater, L.Wagener, N.Berninghausen, O.Becker, T.Neupert, W.Beckmann, R.

(2020) Nat Struct Mol Biol 27: 142-149

  • DOI: https://doi.org/10.1038/s41594-019-0364-1
  • Primary Citation of Related Structures:  
    6SH3, 6SH4, 6SH5

  • PubMed Abstract: 

    Some proteins require completion of folding before translocation across a membrane into another cellular compartment. Yet the permeability barrier of the membrane should not be compromised and mechanisms have remained mostly elusive. Here, we present the structure of Saccharomyces cerevisiae Bcs1, an AAA-ATPase of the inner mitochondrial membrane. Bcs1 facilitates the translocation of the Rieske protein, Rip1, which requires folding and incorporation of a 2Fe-2S cluster before translocation and subsequent integration into the bc1 complex. Surprisingly, Bcs1 assembles into exclusively heptameric homo-oligomers, with each protomer consisting of an amphipathic transmembrane helix, a middle domain and an ATPase domain. Together they form two aqueous vestibules, the first being accessible from the mitochondrial matrix and the second positioned in the inner membrane, with both separated by the seal-forming middle domain. On the basis of this unique architecture, we propose an airlock-like translocation mechanism for folded Rip1.

  • Organizational Affiliation

    Gene Center and Center for Integrated Protein Science Munich, Department of Biochemistry, University of Munich, Munich, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Mitochondrial chaperone BCS1
A, B, C, D, E
A, B, C, D, E, F, G
456Saccharomyces cerevisiaeMutation(s): 0 
Membrane Entity: Yes 
Find proteins for P32839 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P32839 
Go to UniProtKB:  P32839
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP32839
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 4.40 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2020-02-05
    Type: Initial release
  • Version 1.1: 2020-02-19
    Changes: Database references