1ACV

DSBA MUTANT H32S


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.182 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

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

  • DOI: 10.1002/pro.5560060910
  • Primary Citation of Related Structures:  

  • 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 re ...

    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.


    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
    • The Uncharged Surface Features Surrounding the Active Site of Escherichia Coli Dsba are Conserved and are Implicated in Peptide Binding
      Guddat, L.W.,Bardwell, J.C.,Zander, T.,Martin, J.L.
      (1997) Protein Sci. 6: 1148


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DSBA
A, B
189Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: dsbA (dsf, ppfA)
Find proteins for P0AEG4 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AEG4
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.182 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 117.300α = 90.00
b = 64.900β = 126.10
c = 75.900γ = 90.00
Software Package:
Software NamePurpose
X-PLORphasing
X-PLORrefinement
DENZOdata reduction
X-PLORmodel building
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-10-15
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance