Iron Superoxide Dismutase (FE-SOD) from the Hyperthermophile SULFOLOBUS SOLFATARICUS. 2.3 A Resolution Structure of Recombinant Protein with a Covalently Modified Tyrosine in the Active Site.

Experimental Data Snapshot

  • Resolution: 2.30 Å
  • R-Value Free: 0.187 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.167 

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Iron Superoxide Dismutase from the Archaeon Sulfolobus Solfataricus: Analysis of Structure and Thermostability

Ursby, T.Adinolfi, B.S.Al-Karadaghi, S.De Vendittis, E.Bocchini, V.

(1999) J Mol Biol 286: 189

  • DOI: https://doi.org/10.1006/jmbi.1998.2471
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The crystal structure of superoxide dismutase (SOD) from the hyper thermophile Sulfolobus solfataricus has been determined at 2.3 A resolution by molecular replacement and refined to a crystallographic R-factor of 16.8 % (Rfree 19.8 %). The crystals belong to the space group C2 (a=76.3 A, b=124.3 A, c=60.3 A, beta=128.8 degrees) with two identical monomers in the asymmetric unit. The monomer has a molecular weight of 24 kDa and consists of 210 amino acid residues of which 205 are visible in the electron density map. The overall fold of the monomer of S. solfataricus SOD is similar to that of the other known Fe or Mn-SODs. S. solfataricus SOD forms a very compact tetramer of a type similar to that of SOD from the hyperthermophile Aquifex pyrophilus. Both structures show an elevated number of inter-subunit ion-pairs compared with the mesophilic SOD from Mycobacterium tuberculosis and the thermophilic SOD from Thermus thermophilus. However, in contrast to the A. pyrophilus SOD structure, the number of intra-subunit ion-pairs as well as inter- subunit hydrogen bonds is not higher than in the compared mesophilic and thermophilic SOD structures. The electron density also revealed an unexpected and unusual covalent modification of a conserved tyrosine in the active site. Its involvement in the specific activity of the enzyme is discussed.

  • Organizational Affiliation

    Molecular Biophysics, Center for Chemistry and Chemical Engineering, Lund University, Lund, S-22100, Sweden.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
210Saccharolobus solfataricusMutation(s): 0 
Find proteins for P80857 (Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2))
Explore P80857 
Go to UniProtKB:  P80857
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP80857
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.30 Å
  • R-Value Free: 0.187 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.167 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 76.266α = 90
b = 124.324β = 128.75
c = 60.268γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-11-08
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-05-23
    Changes: Data collection, Structure summary
  • Version 1.4: 2019-05-08
    Changes: Data collection, Derived calculations, Experimental preparation
  • Version 1.5: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description