Solution structure of CHCH5

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

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Structural characterization of CHCHD5 and CHCHD7: Two atypical human twin CX(9)C proteins.

Banci, L.Bertini, I.Ciofi-Baffoni, S.Jaiswal, D.Neri, S.Peruzzini, R.Winkelmann, J.

(2012) J Struct Biol 180: 190-200

  • DOI: https://doi.org/10.1016/j.jsb.2012.07.007
  • Primary Citation of Related Structures:  
    2LQL, 2LQT

  • PubMed Abstract: 

    Twin CX(9)C proteins constitute a large protein family among all eukaryotes; are putative substrates of the mitochondrial Mia40-dependent import machinery; contain a coiled coil-helix-coiled coil-helix (CHCH) fold stabilized by two disulfide bonds as exemplified by three structures available for this family. However, they considerably differ at the primary sequence level and this prevents an accurate prediction of their structural models. With the aim of expanding structural information on CHCH proteins, here we structurally characterized human CHCHD5 and CHCHD7. While CHCHD5 has two weakly interacting CHCH domains which sample a range of limited conformations as a consequence of hydrophobic interactions, CHCHD7 has a third helix hydrophobically interacting with an extension of helix α2, which is part of the CHCH domain. Upon reduction of the disulfide bonds both proteins become unstructured exposing hydrophobic patches, with the result of protein aggregation/precipitation. These results suggest a model where the molecular interactions guiding the protein recognition between Mia40 and the disulfide-reduced CHCHD5 and CHCHD7 substrates occurs in vivo when the latter proteins are partially embedded in the protein import pore of the outer membrane of mitochondria.

  • Organizational Affiliation

    Magnetic Resonance Center CERM, University of Florence, Via Luigi Sacconi 6, 50019 Sesto Fiorentino, Florence, Italy. banci@cerm.unifi.it

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Coiled-coil-helix-coiled-coil-helix domain-containing protein 5113Homo sapiensMutation(s): 0 
Gene Names: C2orf9CHCHD5
UniProt & NIH Common Fund Data Resources
Find proteins for Q9BSY4 (Homo sapiens)
Explore Q9BSY4 
Go to UniProtKB:  Q9BSY4
GTEx:  ENSG00000125611 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9BSY4
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-10-24
    Type: Initial release
  • Version 1.1: 2023-12-06
    Changes: Data collection, Database references, Derived calculations