Tryparedoxin peroxidase from Crithidia fasciculata

Experimental Data Snapshot

  • Resolution: 3.20 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.273 
  • R-Value Observed: 0.273 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


The Structure of Reduced Tryparedoxin Peroxidase Reveals a Decamer and Insight Into Reactivity of 2Cys-Peroxiredoxins

Alphey, M.S.Bond, C.S.Tetaud, E.Fairlamb, A.H.Hunter, W.N.

(2000) J Mol Biol 300: 903

  • DOI: https://doi.org/10.1006/jmbi.2000.3881
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Tryparedoxin peroxidase (TryP) is a recently discovered 2Cys-peroxiredoxin involved in defence against oxidative stress in parasitic trypanosomatids. The crystal structure of recombinant Crithidia fasciculata TryP, in the reduced state, has been determined using multi-wavelength anomalous dispersion methods applied to a selenomethionyl derivative. The model comprises a decamer with 52 symmetry, ten chloride ions with 23 water molecules and has been refined, using data to 3.2 A resolution (1 A=0.1 nm), to an R-factor and R(free) of 27.3 and 28.6 %, respectively. Secondary structure topology places TryP along with tryparedoxin and glutathione peroxidase in a distinct subgroup of the thioredoxin super-family. The molecular details at the active site support ideas about the enzyme mechanism and comparisons with an oxidised 2Cys-peroxiredoxin reveal structural alterations induced by the change in oxidation state. These include a difference in quaternary structure from dimer (oxidised form) to decamer (reduced form). The 2Cys-peroxiredoxin assembly may prevent indiscriminate oligomerisation, localise ten peroxidase active sites and contribute to both the specificity of reduction by the redox partner tryparedoxin and attraction of peroxides into the active site.

  • Organizational Affiliation

    Department of Biochemistry, The Wellcome Trust Biocentre, University of Dundee, Dundee, DD1 5EH, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D, E
A, B, C, D, E, F, G, H, I, J
188Crithidia fasciculataMutation(s): 0 
Gene Names: CF-TRYP
Find proteins for Q9TZX2 (Crithidia fasciculata)
Explore Q9TZX2 
Go to UniProtKB:  Q9TZX2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9TZX2
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
A, B, C, D, E
A, B, C, D, E, F, G, H, I, J
Experimental Data & Validation

Experimental Data

  • Resolution: 3.20 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.273 
  • R-Value Observed: 0.273 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 123.8α = 90
b = 97.2β = 93.1
c = 133.8γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-03-23
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-05-08
    Changes: Data collection, Derived calculations, Experimental preparation, Other