2nd Crystal Structure Of A Soluble Domain Of ResA In The Oxidised Form

Experimental Data Snapshot

  • Resolution: 1.40 Å
  • R-Value Free: 0.175 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.163 

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Mechanism of substrate specificity in Bacillus subtilis ResA, a thioredoxin-like protein involved in cytochrome c maturation

Colbert, C.L.Wu, Q.Erbel, P.J.A.Gardner, K.H.Deisenhofer, J.

(2006) Proc Natl Acad Sci U S A 103: 4410-4415

  • DOI: https://doi.org/10.1073/pnas.0600552103
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The covalent attachment of heme cofactors to the apo-polypeptides via thioether bonds is unique to the maturation of c-type cytochromes. A number of thiol-disulfide oxidoreductases prepare the apocytochrome for heme insertion in system I and II cytochrome c maturation. Although most thiol-disulfide oxidoreductases are nonspecific, the less common, specific thiol-disulfide oxidoreductases may be key to directing the usage of electrons. Here we demonstrate that unlike other thiol-disulfide oxidoreductases, the protein responsible for reducing oxidized apocytochrome c in Bacillus subtilis, ResA, is specific for cytochrome c550 and utilizes alternate conformations to recognize redox partners. We report solution NMR evidence that ResA undergoes a redox-dependent conformational change between oxidation states, as well as data showing that ResA utilizes a surface cavity present only in the reduced state to recognize a peptide derived from cytochrome c550. Finally, we confirm that ResA is a specific thiol-disulfide oxidoreductase by comparing its reactivity to our mimetic peptide with its reactivity to oxidized glutathione, a nonspecific substrate. This study biochemically demonstrates the specificity of this thiol-disulfide oxidoreductase and enables us to outline a structural mechanism of regulating the usage of electrons in a thiol-disulfide oxidoreductase system.

  • Organizational Affiliation

    Howard Hughes Medical Institute, and Department of Biochemistry, University of Texas Southwestern Medical Center, 6001 Forest Park Road, Dallas, TX 75390, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Thiol-disulfide oxidoreductase resA
A, B
151Bacillus subtilisMutation(s): 5 
Gene Names: resa
Find proteins for P35160 (Bacillus subtilis (strain 168))
Explore P35160 
Go to UniProtKB:  P35160
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP35160
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
A, B
Experimental Data & Validation

Experimental Data

  • Resolution: 1.40 Å
  • R-Value Free: 0.175 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.163 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.186α = 90
b = 61.186β = 90
c = 166.999γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-04-18
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance