3C71

Structure of a ResA variant with a DsbA-like active site motif (CPHC)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.164 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Effects of substitutions in the CXXC active-site motif of the extracytoplasmic thioredoxin ResA.

Lewin, A.Crow, A.Hodson, C.T.Hederstedt, L.Le Brun, N.E.

(2008) Biochem.J. 414: 81-91

  • DOI: 10.1042/BJ20080356
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The thiol-disulfide oxidoreductase ResA from Bacillus subtilis fulfils a reductive role in cytochrome c maturation. The pK(a) values for the CEPC (one-letter code) active-site cysteine residues of ResA are unusual for thioredoxin-like proteins in tha ...

    The thiol-disulfide oxidoreductase ResA from Bacillus subtilis fulfils a reductive role in cytochrome c maturation. The pK(a) values for the CEPC (one-letter code) active-site cysteine residues of ResA are unusual for thioredoxin-like proteins in that they are both high (>8) and within 0.5 unit of each other. To determine the contribution of the inter-cysteine dipeptide of ResA to its redox and acid-base properties, three variants (CPPC, CEHC and CPHC) were generated representing a stepwise conversion into the active-site sequence of the high-potential DsbA protein from Escherichia coli. The substitutions resulted in large decreases in the pK(a) values of both the active-site cysteine residues: in CPHC (DsbA-type) ResA, DeltapK(a) values of -2.5 were measured for both cysteine residues. Increases in midpoint reduction potentials were also observed, although these were comparatively small: CPHC (DsbA-type) ResA exhibited an increase of +40 mV compared with the wild-type protein. Unfolding studies revealed that, despite the observed differences in the properties of the reduced proteins, changes in stability were largely confined to the oxidized state. High-resolution structures of two of the variants (CEHC and CPHC ResA) in their reduced states were determined and are discussed in terms of the observed changes in properties. Finally, the in vivo functional properties of CEHC ResA are shown to be significantly affected compared with those of the wild-type protein.


    Organizational Affiliation

    Centre for Molecular and Structural Biochemistry, School of Chemical Sciences and Pharmacy, University of East Anglia, Norwich NR4 7TJ, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Thiol-disulfide oxidoreductase resA
A
143Bacillus subtilis (strain 168)Mutation(s): 2 
Gene Names: resA (ypxA)
Find proteins for P35160 (Bacillus subtilis (strain 168))
Go to UniProtKB:  P35160
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EDO
Query on EDO

Download SDF File 
Download CCD File 
A
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.164 
  • Space Group: P 65
Unit Cell:
Length (Å)Angle (°)
a = 36.975α = 90.00
b = 36.975β = 90.00
c = 177.665γ = 120.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
REFMACrefinement
MOLREPphasing
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2008-02-06 
  • Released Date: 2008-08-12 
  • Deposition Author(s): Crow, A.

Revision History 

  • Version 1.0: 2008-08-12
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2016-12-14
    Type: Structure summary
  • Version 1.3: 2017-10-25
    Type: Refinement description