3DIE

Domain swapping of Staphylococcus Aureus thioredoxin W28A mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.192 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Coupling of domain swapping to kinetic stability in a thioredoxin mutant

Garcia-Pino, A.Martinez-Rodriguez, S.Wahni, K.Wyns, L.Loris, R.Messens, J.

(2009) J.Mol.Biol. 385: 1590-1599

  • DOI: 10.1016/j.jmb.2008.11.040

  • PubMed Abstract: 
  • The thioredoxin (Trx) fold is a small monomeric domain that is ubiquitous in redox-active enzymes. Trxs are characterized by a typical WCGPC active-site sequence motif. A single active-site mutation of the tryptophan to an alanine in Staphylococcus a ...

    The thioredoxin (Trx) fold is a small monomeric domain that is ubiquitous in redox-active enzymes. Trxs are characterized by a typical WCGPC active-site sequence motif. A single active-site mutation of the tryptophan to an alanine in Staphylococcus aureus Trx converts the oxidized protein into a biologically inactive domain-swapped dimer. While the monomeric protein unfolds reversibly in a two-state manner, the oxidized dimeric form is kinetically stable and converts to the monomeric form upon refolding. After reduction, the half-life of the dimer decreases many orders of magnitude to approximately 4.3 h, indicating that the active-site disulfide between Cys29 and Cys32 is an important determinant for the kinetics of unfolding. We propose kinetic stability as a possible evolutionary strategy in the evolution of multimeric proteins from their monomeric ancestors by domain swapping, which, for this biologically inactive Trx mutant, turned out to be an evolutionary dead end.


    Organizational Affiliation

    Department of Molecular and Cellular Interactions, Vlaams Instituut voor Biotechnologie, Brussels, Belgium.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Thioredoxin
A, B
106Staphylococcus aureusMutation(s): 1 
Gene Names: trxA
Find proteins for P0A0K6 (Staphylococcus aureus)
Go to UniProtKB:  P0A0K6
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FE
Query on FE

Download SDF File 
Download CCD File 
A, B
FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
 Ligand Interaction
CD
Query on CD

Download SDF File 
Download CCD File 
A, B
CADMIUM ION
Cd
WLZRMCYVCSSEQC-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.192 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 88.703α = 90.00
b = 84.451β = 90.00
c = 34.699γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data collection
REFMACrefinement
SCALEPACKdata scaling
DENZOdata reduction
PDB_EXTRACTdata extraction
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-03-24
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance