Experimental Data Snapshot

  • Resolution: 2.70 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.233 

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Crystal structures of reduced and oxidized DsbA: investigation of domain motion and thiolate stabilization.

Guddat, L.W.Bardwell, J.C.Martin, J.L.

(1998) Structure 6: 757-767

  • DOI: https://doi.org/10.1016/s0969-2126(98)00077-x
  • Primary Citation of Related Structures:  
    1A2J, 1A2L, 1A2M

  • PubMed Abstract: 

    The redox proteins that incorporate a thioredoxin fold have diverse properties and functions. The bacterial protein-folding factor DsbA is the most oxidizing of the thioredoxin family. DsbA catalyzes disulfide-bond formation during the folding of secreted proteins. The extremely oxidizing nature of DsbA has been proposed to result from either domain motion or stabilizing active-site interactions in the reduced form. In the domain motion model, hinge bending between the two domains of DsbA occurs as a result of redox-related conformational changes. We have determined the crystal structures of reduced and oxidized DsbA in the same crystal form and at the same pH (5.6). The crystal structure of a lower pH form of oxidized DsbA has also been determined (pH 5.0). These new crystal structures of DsbA, and the previously determined structure of oxidized DsbA at pH 6.5, provide the foundation for analysis of structural changes that occur upon reduction of the active-site disulfide bond. The structures of reduced and oxidized DsbA reveal that hinge bending motions do occur between the two domains. These motions are independent of redox state, however, and therefore do not contribute to the energetic differences between the two redox states. Instead, the observed domain motion is proposed to be a consequence of substrate binding. Furthermore, DsbA's highly oxidizing nature is a result of hydrogen bond, electrostatic and helix-dipole interactions that favour the thiolate over the disulfide at the active site.

  • Organizational Affiliation

    Centre for Drug Design and Development University of Queensland Brisbane, QLD, 4072, Australia.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
189Escherichia coliMutation(s): 0 
Find proteins for P0AEG4 (Escherichia coli (strain K12))
Explore P0AEG4 
Go to UniProtKB:  P0AEG4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0AEG4
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.70 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.233 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 88.88α = 90
b = 83.36β = 90
c = 58.3γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-07-08
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-08-02
    Changes: Database references, Other, Refinement description
  • Version 1.4: 2024-05-22
    Changes: Data collection