3D21

Crystal structure of a poplar wild-type thioredoxin h, PtTrxh4


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.213 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

An Atypical Catalytic Mechanism Involving Three Cysteines of Thioredoxin.

Koh, C.S.Navrot, N.Didierjean, C.Rouhier, N.Hirasawa, M.Knaff, D.B.Wingsle, G.Samian, R.Jacquot, J.P.Corbier, C.Gelhaye, E.

(2008) J Biol Chem 283: 23062-23072

  • DOI: 10.1074/jbc.M802093200
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Unlike other thioredoxins h characterized so far, a poplar thioredoxin of the h type, PtTrxh4, is reduced by glutathione and glutaredoxin (Grx) but not NADPH:thioredoxin reductase (NTR). PtTrxh4 contains three cysteines: one localized in an N-termina ...

    Unlike other thioredoxins h characterized so far, a poplar thioredoxin of the h type, PtTrxh4, is reduced by glutathione and glutaredoxin (Grx) but not NADPH:thioredoxin reductase (NTR). PtTrxh4 contains three cysteines: one localized in an N-terminal extension (Cys(4)) and two (Cys(58) and Cys(61)) in the classical thioredoxin active site ((57)WCGPC(61)). The property of a mutant in which Cys(58) was replaced by serine demonstrates that it is responsible for the initial nucleophilic attack during the catalytic cycle. The observation that the C4S mutant is inactive in the presence of Grx but fully active when dithiothreitol is used as a reductant indicates that Cys(4) is required for the regeneration of PtTrxh4 by Grx. Biochemical and x-ray crystallographic studies indicate that two intramolecular disulfide bonds involving Cys(58) can be formed, linking it to either Cys(61) or Cys(4). We propose thus a four-step disulfide cascade mechanism involving the transient glutathionylation of Cys(4) to convert this atypical thioredoxin h back to its active reduced form.


    Organizational Affiliation

    Equipe Biocristallographie, UMR 7036 CNRS-Université Henri Poincaré, URAFPA, Equipe PB2P, Faculté des Sciences et Techniques, Nancy Université, BP 239, 54506 Vandoeuvre Cedex France.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Thioredoxin H-type
A, B
139Populus trichocarpa x Populus deltoidesMutation(s): 0 
Find proteins for P85801 (Populus jackii)
Go to UniProtKB:  P85801
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.213 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.355α = 90
b = 47.355β = 90
c = 195.996γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection
MOLREPphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-07-01
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-10-25
    Changes: Refinement description