Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 42.31 kDa 
• Atom Count: 3166 
• Modelled Residue Count: 376 
• Deposited Residue Count: 378 
• Unique protein chains: 1

1FVK

THE 1.7 ANGSTROM STRUCTURE OF WILD TYPE DISULFIDE BOND FORMATION PROTEIN (DSBA)

• PDB DOI: 10.2210/pdb1FVK/pdb

• Classification: DISULFIDE OXIDOREDUCTASE
• Organism(s): Escherichia coli
• Mutation(s): No 


• Deposited: 1996-08-28 Released: 1997-08-20 
• Deposition Author(s): Martin, J.L., Guddat, L.W.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Free: 0.231 
• R-Value Work: 0.198 
• R-Value Observed: 0.198 

Literature

Structural analysis of three His32 mutants of DsbA: support for an electrostatic role of His32 in DsbA stability.

Guddat, L.W., Bardwell, J.C., Glockshuber, R., Huber-Wunderlich, M., Zander, T., Martin, J.L.

(1997) Protein Sci 6: 1893-1900

• PubMed: 9300489 
• DOI: 10.1002/pro.5560060910
• Primary Citation of Related Structures:  
  1AC1, 1ACV, 1FVJ, 1FVK


• PubMed Abstract: 
  

DsbA, a 21-kDa protein from Escherichia coli, is a potent oxidizing disulfide catalyst required for disulfide bond formation in secreted proteins. The active site of DsbA is similar to that of mammalian protein disulfide isomerases, and includes a reversible disulfide bond formed from cysteines separated by two residues (Cys30-Pro31-His32-Cys33). Unlike most protein disulfides, the active-site disulfide of DsbA is highly reactive and the oxidized form of DsbA is much less stable than the reduced form at physiological pH. His32, one of the two residues between the active-site cysteines, is critical to the oxidizing power of DsbA and to the relative instability of the protein in the oxidized form. Mutation of this single residue to tyrosine, serine, or leucine results in a significant increase in stability (of approximately 5-7 kcal/mol) of the oxidized His32 variants relative to the oxidized wild-type protein. Despite the dramatic changes in stability, the structures of all three oxidized DsbA His32 variants are very similar to the wild-type oxidized structure, including conservation of solvent atoms near the active-site residue, Cys30. These results show that the His32 residue does not exert a conformational effect on the structure of DsbA. The destabilizing effect of His32 on oxidized DsbA is therefore most likely electrostatic in nature.

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Related Citations: 

• Crystal Structure of the Dsba Protein Required for Disulphide Bond Formation in Vivo
  Martin, J.L., Bardwell, J.C., Kuriyan, J.
  (1993) Nature 365: 464

• Crystallization of Dsba, an Escherichia Coli Protein Required for Disulphide Bond Formation in Vivo
  Martin, J.L., Waksman, G., Bardwell, J.C., Beckwith, J., Kuriyan, J.
  (1993) J Mol Biol 230: 1097

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
DISULFIDE BOND FORMATION PROTEIN	A, B	189	Escherichia coli	Mutation(s): 0
UniProt
Find proteins for P0AEG4 (Escherichia coli (strain K12)) Explore P0AEG4  Go to UniProtKB:  P0AEG4

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Free: 0.231 
• R-Value Work: 0.198 
• R-Value Observed: 0.198 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 117.7	α = 90
b = 65.1	β = 126.3
c = 76.4	γ = 90

Software Package:

Software Name	Purpose
RIGAKU	data collection
RIGAKU	data reduction
X-PLOR	model building
X-PLOR	refinement
RIGAKU	data scaling
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1996-08-28 
• Released Date: 1997-08-20 
Deposition Author(s): Martin, J.L., Guddat, L.W.

Revision History  

• Version 1.0: 1997-08-20
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance