Crystal Structure of Staphylococcus aureus DsbA

Experimental Data Snapshot

  • Resolution: 1.81 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.198 

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Staphylococcus aureus DsbA Does Not Have a Destabilizing Disulfide: A NEW PARADIGM FOR BACTERIAL OXIDATIVE FOLDING

Heras, B.Kurz, M.Jarrott, R.Shouldice, S.R.Frei, P.Robin, G.Cemazar, M.Thony-Meyer, L.Glockshuber, R.Martin, J.L.

(2008) J Biol Chem 283: 4261-4271

  • DOI: https://doi.org/10.1074/jbc.M707838200
  • Primary Citation of Related Structures:  
    3BCI, 3BCK, 3BD2

  • PubMed Abstract: 

    In Gram-negative bacteria, the introduction of disulfide bonds into folding proteins occurs in the periplasm and is catalyzed by donation of an energetically unstable disulfide from DsbA, which is subsequently re-oxidized through interaction with DsbB. Gram-positive bacteria lack a classic periplasm but nonetheless encode Dsb-like proteins. Staphylococcus aureus encodes just one Dsb protein, a DsbA, and no DsbB. Here we report the crystal structure of S. aureus DsbA (SaDsbA), which incorporates a thioredoxin fold with an inserted helical domain, like its Escherichia coli counterpart EcDsbA, but it lacks the characteristic hydrophobic patch and has a truncated binding groove near the active site. These findings suggest that SaDsbA has a different substrate specificity than EcDsbA. Thermodynamic studies indicate that the oxidized and reduced forms of SaDsbA are energetically equivalent, in contrast to the energetically unstable disulfide form of EcDsbA. Further, the partial complementation of EcDsbA by SaDsbA is independent of EcDsbB and biochemical assays show that SaDsbA does not interact with EcDsbB. The identical stabilities of oxidized and reduced SaDsbA may facilitate direct re-oxidation of the protein by extracellular oxidants, without the need for DsbB.

  • Organizational Affiliation

    Institute for Molecular Bioscience, University of Queensland, Brisbane QLD 4072, Australia. bheras@imb.uq.edu.au

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Disulfide bond protein A186Staphylococcus aureusMutation(s): 0 
Gene Names: AAG41993
Find proteins for Q9EYL5 (Staphylococcus aureus)
Explore Q9EYL5 
Go to UniProtKB:  Q9EYL5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9EYL5
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.81 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.198 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 72.099α = 90
b = 72.099β = 90
c = 92.098γ = 120
Software Package:
Software NamePurpose
d*TREKdata scaling
PDB_EXTRACTdata extraction
CrystalCleardata collection
d*TREKdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-12-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance