Crystal structure of native tryparedoxin I from Crithidia fasciculata

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.168 

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Structures of tryparedoxins revealing interaction with trypanothione.

Hofmann, B.Budde, H.Bruns, K.Guerrero, S.A.Kalisz, H.M.Menge, U.Montemartini, M.Nogoceke, E.Steinert, P.Wissing, J.B.Flohe, L.Hecht, H.J.

(2001) Biol Chem 382: 459-471

  • DOI: https://doi.org/10.1515/BC.2001.056
  • Primary Citation of Related Structures:  
    1EWX, 1EZK, 1FG4, 1I5G

  • PubMed Abstract: 

    Tryparedoxins (TXNs) catalyse the reduction of peroxiredoxin-type peroxidases by the bis-glutathionyl derivative of spermidine, trypanothione, and are relevant to hydroperoxide detoxification and virulence of trypanosomes. The 3D-structures of the following tryparedoxins are presented: authentic tryparedoxin1 of Crithidia fasciculata, CfTXN1; the his-tagged recombinant protein, CfTXN1H6; reduced and oxidised CfTXN2, and an alternative substrate derivative of the mutein CfTXN2H6-Cys44Ser. Cys41 (Cys40 in TXN1) of the active site motif 40-WCPPCR-45 proved to be the only solvent-exposed redox active residue in CfTXN2. In reduced TXNs, its nucleophilicity is increased by a network of hydrogen bonds. In oxidised TXNs it can be attacked by the thiol of the 1N-glutathionyl residue of trypanothione, as evidenced by the structure of 1N-glutathionylspermidine-derivatised CfTXN2H6-Cys44Ser. Modelling suggests Arg45 (44), Glu73 (72), the Ile110 (109) cis-Pro111 (110)-bond and Arg129 (128) to be involved in the binding of trypanothione to CfTXN2 (CfTXN1). The model of TXN-substrate interaction is consistent with functional characteristics of known and newly designed muteins (CfTXN2H6-Arg129Asp and Glu73Arg) and the 1N-glutathionyl-spermidine binding in the CfTXN2H6-Cys44Ser structure.

  • Organizational Affiliation

    Department of Biochemistry, Technical University of Braunschweig, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TRYPAREDOXIN I146Crithidia fasciculataMutation(s): 0 
Find proteins for O96438 (Crithidia fasciculata)
Explore O96438 
Go to UniProtKB:  O96438
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO96438
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.168 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 37.94α = 90
b = 51.39β = 90
c = 71.46γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-05-10
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance