Crystal structure of Aspergillus fumigatus MnSOD

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.194 

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Comparison of the crystal structures of the human manganese superoxide dismutase and the homologous Aspergillus fumigatus allergen at 2-A resolution.

Fluckiger, S.Mittl, P.R.Scapozza, L.Fijten, H.Folkers, G.Grutter, M.G.Blaser, K.Crameri, R.

(2002) J Immunol 168: 1267-1272

  • DOI: https://doi.org/10.4049/jimmunol.168.3.1267
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Manganese superoxide dismutase (MnSOD) of Aspergillus fumigatus, a fungus involved in many pulmonary complications, has been identified as IgE-binding protein. It has been shown also that MnSODs from other organisms, including human, are recognized by IgE Abs from individuals sensitized to A. fumigatus MnSOD. Comparison of the fungal and the human crystal structure should allow the identification of structural similarities responsible for IgE-mediated cross-reactivity. The three-dimensional structure of A. fumigatus MnSOD has been determined at 2-A resolution by x-ray diffraction analysis. Crystals belonged to space group P2(1)2(1)2(1) with unit cell dimensions of a = 65.88 A, b = 98.7 A, and c = 139.28 A. The structure was solved by molecular replacement using the structure of the human MnSOD as a search model. The final refined model included four chains of 199-200 amino acids, four manganese ions, and 745 water molecules, with a crystallographic R-factor of 19.4% and a free R-factor of 23.3%. Like MnSODs of other eukaryotic organisms, A. fumigatus MnSOD forms a homotetramer with the manganese ions coordinated by three histidines, one aspartic acid, and one water molecule. The fungal and the human MnSOD share high similarity on the level of both primary and tertiary structure. We identified conserved amino acids that are solvent exposed in the fungal and the human crystal structure and are therefore potentially involved in IgE-mediated cross-reactivity.

  • Organizational Affiliation

    Swiss Institute of Allergy and Asthma Research, Obere Strasse 22, CH-7270 Davos, Switzerland.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Manganese Superoxide DismutaseA,
C [auth X],
D [auth Y]
221Aspergillus fumigatusMutation(s): 0 
Find proteins for Q92450 (Aspergillus fumigatus (strain ATCC MYA-4609 / CBS 101355 / FGSC A1100 / Af293))
Explore Q92450 
Go to UniProtKB:  Q92450
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ92450
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.194 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 65.882α = 90
b = 98.697β = 90
c = 139.281γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-12-28
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance