1EWX

Crystal structure of native tryparedoxin I from Crithidia fasciculata


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.168 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

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: 10.1515/BC.2001.056
  • Primary Citation of Related Structures:  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 fo ...

    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.


    Related Citations: 
    • Crystallization and preliminary X-ray analysis of tryparedoxin I from Crithidia fasciculata
      Kalisz, H.M.,Nogoceke, E.,Gommel, D.U.,Hofmann, B.,Flohe, L.,Hecht, H.-J.
      (1998) Acta Crystallogr.,Sect.D 55: 696


    Organizational Affiliation

    Department of Biochemistry, Technical University of Braunschweig, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TRYPAREDOXIN I
A
146Crithidia fasciculataGene Names: TryX (txnI)
Find proteins for O96438 (Crithidia fasciculata)
Go to UniProtKB:  O96438
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
ACE
Query on ACE
A
NON-POLYMERC2 H4 O

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.168 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 37.940α = 90.00
b = 51.390β = 90.00
c = 71.460γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
REFMACrefinement
SCALAdata scaling
CCP4data scaling
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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