Crystal Structure of Miner1: The Redox-active 2Fe-2S Protein Causative in Wolfram Syndrome 2

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.172 

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Crystal structure of Miner1: The redox-active 2Fe-2S protein causative in Wolfram Syndrome 2.

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

(2009) J Mol Biol 392: 143-153

  • DOI: https://doi.org/10.1016/j.jmb.2009.06.079
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The endoplasmic reticulum protein Miner1 is essential for health and longevity. Mis-splicing of CISD2, which codes for Miner1, is causative in Wolfram Syndrome 2 (WFS2) resulting in early onset optic atrophy, diabetes mellitus, deafness and decreased lifespan. In knock-out studies, disruption of CISD2 leads to accelerated aging, blindness and muscle atrophy. In this work, we characterized the soluble region of human Miner1 and solved its crystal structure to a resolution of 2.1 A (R-factor=17%). Although originally annotated as a zinc finger, we show that Miner1 is a homodimer harboring two redox-active 2Fe-2S clusters, indicating for the first time an association of a redox-active FeS protein with WFS2. Each 2Fe-2S cluster is bound by a rare Cys(3)-His motif within a 17 amino acid segment. Miner1 is the first functionally different protein that shares the NEET fold with its recently identified paralog mitoNEET, an outer mitochondrial membrane protein. We report the first measurement of the redox potentials (E(m)) of Miner1 and mitoNEET, showing that they are proton-coupled with E(m) approximately 0 mV at pH 7.5. Changes in the pH sensitivity of their cluster stabilities are attributed to significant differences in the electrostatic distribution and surfaces between the two proteins. The structural and biophysical results are discussed in relation to possible roles of Miner1 in cellular Fe-S management and redox reactions.

  • Organizational Affiliation

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

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CDGSH iron sulfur domain-containing protein 2
A, B
83Homo sapiensMutation(s): 1 
UniProt & NIH Common Fund Data Resources
Find proteins for Q8N5K1 (Homo sapiens)
Explore Q8N5K1 
Go to UniProtKB:  Q8N5K1
GTEx:  ENSG00000145354 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8N5K1
Sequence Annotations
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.172 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 40.904α = 90
b = 48.579β = 90
c = 74.104γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PDB_EXTRACTdata extraction
Blu-Icedata collection
XDSdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-08-18
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Refinement description, Version format compliance
  • Version 1.2: 2021-10-20
    Changes: Database references, Derived calculations
  • Version 1.3: 2024-02-21
    Changes: Data collection