Crystal structure of Wolbachia pipientis alpha-DsbA1 C97A/C146A

Experimental Data Snapshot

  • Resolution: 1.85 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.174 

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Structural and Functional Characterization of the Oxidoreductase alpha-DsbA1 from Wolbachia pipientis

Kurz, M.Iturbe-Ormaetxe, I.Jarrott, R.Shouldice, S.R.Wouters, M.A.Frei, P.Glockshuber, R.O'Neill, S.L.Heras, B.Martin, J.L.

(2009) Antioxid Redox Signal 11: 1485-1500

  • DOI: https://doi.org/10.1089/ars.2008.2420
  • Primary Citation of Related Structures:  
    3F4R, 3F4S, 3F4T

  • PubMed Abstract: 

    The alpha-proteobacterium Wolbachia pipientis is a highly successful intracellular endosymbiont of invertebrates that manipulates its host's reproductive biology to facilitate its own maternal transmission. The fastidious nature of Wolbachia and the lack of genetic transformation have hampered analysis of the molecular basis of these manipulations. Structure determination of key Wolbachia proteins will enable the development of inhibitors for chemical genetics studies. Wolbachia encodes a homologue (alpha-DsbA1) of the Escherichia coli dithiol oxidase enzyme EcDsbA, essential for the oxidative folding of many exported proteins. We found that the active-site cysteine pair of Wolbachia alpha-DsbA1 has the most reducing redox potential of any characterized DsbA. In addition, Wolbachia alpha-DsbA1 possesses a second disulfide that is highly conserved in alpha-proteobacterial DsbAs but not in other DsbAs. The alpha-DsbA1 structure lacks the characteristic hydrophobic features of EcDsbA, and the protein neither complements EcDsbA deletion mutants in E. coli nor interacts with EcDsbB, the redox partner of EcDsbA. The surface characteristics and redox profile of alpha-DsbA1 indicate that it probably plays a specialized oxidative folding role with a narrow substrate specificity. This first report of a Wolbachia protein structure provides the basis for future chemical genetics studies.

  • Organizational Affiliation

    Institute for Molecular Bioscience, University of New South Wales, Sydney, Australia.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative uncharacterized protein226Wolbachia endosymbiont of Drosophila melanogasterMutation(s): 2 
Gene Names: WD_1055
Find proteins for Q73GA4 (Wolbachia pipientis wMel)
Explore Q73GA4 
Go to UniProtKB:  Q73GA4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ73GA4
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on 1PE

Download Ideal Coordinates CCD File 
C10 H22 O6
Query on PGE

Download Ideal Coordinates CCD File 
C6 H14 O4
Experimental Data & Validation

Experimental Data

  • Resolution: 1.85 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.174 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71α = 90
b = 49.5β = 106
c = 69.3γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
CrystalCleardata collection
CrystalCleardata reduction
CrystalCleardata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-03-24
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Source and taxonomy, Version format compliance
  • Version 1.2: 2021-11-10
    Changes: Database references, Derived calculations
  • Version 1.3: 2023-11-01
    Changes: Data collection, Refinement description