2F9S

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.401 Å
  • R-Value Free: 0.175 
  • R-Value Work: 0.162 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

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.USA 103: 4410-4415

  • DOI: 10.1073/pnas.0600552103

  • 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 cytoc ...

    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.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Thiol-disulfide oxidoreductase resA
A, B
151Bacillus subtilis (strain 168)Gene Names: resA (ypxA)
Find proteins for P35160 (Bacillus subtilis (strain 168))
Go to UniProtKB:  P35160
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.401 Å
  • R-Value Free: 0.175 
  • R-Value Work: 0.162 
  • Space Group: P 65
Unit Cell:
Length (Å)Angle (°)
a = 61.186α = 90.00
b = 61.186β = 90.00
c = 166.999γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data collection
REFMACrefinement
SCALEPACKdata scaling
HKL-2000data reduction
SOLVEphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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