Human MitoNEET with 2Fe-2S Coordinating Ligand His 87 Replaced With Cys

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 

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Mutation of the His ligand in mitoNEET stabilizes the 2Fe-2S cluster despite conformational heterogeneity in the ligand environment.

Conlan, A.R.Paddock, M.L.Homer, C.Axelrod, H.L.Cohen, A.E.Abresch, E.C.Zuris, J.A.Nechushtai, R.Jennings, P.A.

(2011) Acta Crystallogr D Biol Crystallogr 67: 516-523

  • DOI: https://doi.org/10.1107/S0907444911011577
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    MitoNEET is the only identified Fe-S protein localized to the outer mitochondrial membrane and a 1.5 Å resolution X-ray analysis has revealed a unique structure [Paddock et al. (2007), Proc. Natl Acad. Sci. USA, 104, 14342-14347]. The 2Fe-2S cluster is bound with a 3Cys-1His coordination which defines a new class of 2Fe-2S proteins. The hallmark feature of this class is the single noncysteine ligand His87, which when replaced by Cys decreases the redox potential (E(m)) by ∼300 mV and increases the stability of the cluster by around sixfold. Unexpectedly, the pH dependence of the lifetime of the 2Fe-2S cluster remains the same as in the wild-type protein. Here, the crystal structure of H87C mitoNEET was determined to 1.7 Å resolution (R factor = 18%) to investigate the structural basis of the changes in the properties of the 2Fe-2S cluster. In comparison to the wild type, structural changes are localized to the immediate vicinity of the cluster-binding region. Despite the increased stability, Cys87 displays two distinct conformations, with distances of 2.3 and 3.2 Å between the S(γ) and the outer Fe of the 2Fe-2S cluster. In addition, Lys55 exhibits multiple conformations in the H87C mutant protein. The structure and distinct characteristics of the H87C mutant provide a framework for further studies investigating the effects of mutation on the properties of the 2Fe-2S cluster in this new class of proteins.

  • Organizational Affiliation

    Departments of Chemistry and Biochemistry, University of California at San Diego, La Jolla, CA 92093, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CDGSH iron sulfur domain-containing protein 1
A, B
79Homo sapiensMutation(s): 1 
Gene Names: C10orf70CISD1MDS029ZCD1
UniProt & NIH Common Fund Data Resources
Find proteins for Q9NZ45 (Homo sapiens)
Explore Q9NZ45 
Go to UniProtKB:  Q9NZ45
GTEx:  ENSG00000122873 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9NZ45
Sequence Annotations
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.311α = 90
b = 49.587β = 90
c = 59.222γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
PDB_EXTRACTdata extraction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-06-01
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2012-03-28
    Changes: Database references
  • Version 1.3: 2024-02-21
    Changes: Data collection, Database references, Derived calculations