Solution structure of detergent-solubilized Rcf1, a yeast mitochondrial inner membrane protein involved in respiratory Complex III/IV supercomplex formation

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 15 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report

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Solution NMR structure of yeast Rcf1, a protein involved in respiratory supercomplex formation.

Zhou, S.Pettersson, P.Huang, J.Sjoholm, J.Sjostrand, D.Pomes, R.Hogbom, M.Brzezinski, P.Maler, L.Adelroth, P.

(2018) Proc Natl Acad Sci U S A 115: 3048-3053

  • DOI: https://doi.org/10.1073/pnas.1712061115
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The Saccharomyces cerevisiae respiratory supercomplex factor 1 (Rcf1) protein is located in the mitochondrial inner membrane where it is involved in formation of supercomplexes composed of respiratory complexes III and IV. We report the solution structure of Rcf1, which forms a dimer in dodecylphosphocholine (DPC) micelles, where each monomer consists of a bundle of five transmembrane (TM) helices and a short flexible soluble helix (SH). Three TM helices are unusually charged and provide the dimerization interface consisting of 10 putative salt bridges, defining a "charge zipper" motif. The dimer structure is supported by molecular dynamics (MD) simulations in DPC, although the simulations show a more dynamic dimer interface than the NMR data. Furthermore, CD and NMR data indicate that Rcf1 undergoes a structural change when reconstituted in liposomes, which is supported by MD data, suggesting that the dimer structure is unstable in a planar membrane environment. Collectively, these data indicate a dynamic monomer-dimer equilibrium. Furthermore, the Rcf1 dimer interacts with cytochrome c , suggesting a role as an electron-transfer bridge between complexes III and IV. The Rcf1 structure will help in understanding its functional roles at a molecular level.

  • Organizational Affiliation

    Department of Biochemistry and Biophysics, Stockholm University, 10691 Stockholm, Sweden; lena.maler@dbb.su.se pia.adelroth@dbb.su.se.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Respiratory supercomplex factor 1, mitochondrial
A, B
174Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: RCF1AIM31SCRG_01865
Membrane Entity: Yes 
Find proteins for Q03713 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q03713 
Go to UniProtKB:  Q03713
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ03713
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 15 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Knut and Alice Wallenberg FoundationSweden--

Revision History  (Full details and data files)

  • Version 1.0: 2018-02-28
    Type: Initial release
  • Version 1.1: 2018-03-14
    Changes: Database references
  • Version 1.2: 2018-03-28
    Changes: Data collection, Database references
  • Version 1.3: 2019-05-08
    Changes: Data collection
  • Version 1.4: 2023-06-14
    Changes: Data collection, Database references, Other