2X8G

Oxidized thioredoxin glutathione reductase from Schistosoma mansoni


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.190 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Mapping the Catalytic Cycle of Schistosoma Mansoni Thioredoxin Glutathione Reductase by X-Ray Crystallography

Angelucci, F.Dimastrogiovanni, D.Boumis, G.Brunori, M.Miele, A.E.Saccoccia, F.Bellelli, A.

(2010) J Biol Chem 285: 32557

  • DOI: 10.1074/jbc.M110.141960
  • Primary Citation of Related Structures:  
    2X8C, 2X8G, 2X8H, 2X99

  • PubMed Abstract: 
  • Schistosomiasis is the second most widespread human parasitic disease. It is principally treated with one drug, praziquantel, that is administered to 100 million people each year; less sensitive strains of schistosomes are emerging. One of the most appealing drug targets against schistosomiasis is thioredoxin glutathione reductase (TGR) ...

    Schistosomiasis is the second most widespread human parasitic disease. It is principally treated with one drug, praziquantel, that is administered to 100 million people each year; less sensitive strains of schistosomes are emerging. One of the most appealing drug targets against schistosomiasis is thioredoxin glutathione reductase (TGR). This natural chimeric enzyme is a peculiar fusion of a glutaredoxin domain with a thioredoxin selenocysteine (U)-containing reductase domain. Selenocysteine is located on a flexible C-terminal arm that is usually disordered in the available structures of the protein and is essential for the full catalytic activity of TGR. In this study, we dissect the catalytic cycle of Schistosoma mansoni TGR by structural and functional analysis of the U597C mutant. The crystallographic data presented herein include the following: the oxidized form (at 1.9 Å resolution); the NADPH- and GSH-bound forms (2.3 and 1.9 Å, respectively); and a different crystal form of the (partially) reduced enzyme (3.1 Å), showing the physiological dimer and the entire C terminus of one subunit. Whenever possible, we determined the rate constants for the interconversion between the different oxidation states of TGR by kinetic methods. By combining the crystallographic analysis with computer modeling, we were able to throw further light on the mechanism of action of S. mansoni TGR. In particular, we hereby propose the putative functionally relevant conformational change of the C terminus after the transfer of reducing equivalents from NADPH to the redox sites of the enzyme.


    Related Citations: 
    • Glutathione Reductase and Thioredoxin Reductase at the Crossroad: The Structure of Schistosoma Mansoni Thioredoxin Glutathione Reductase.
      Angelucci, F., Miele, A.E., Boumis, G., Dimastrogiovanni, D., Brunori, M., Bellelli, A.
      (2008) Proteins 72: 936
    • Inhibition of Schistosoma Mansoni Thioredoxin- Glutathione Reductase by Auranofin: Structural and Kinetic Aspects.
      Angelucci, F., Sayed, A.A., Williams, D.L., Boumis, G., Brunori, M., Dimastrogiovanni, D., Miele, A.E., Pauly, F., Bellelli, A.
      (2009) J Biol Chem 284: 28977

    Organizational Affiliation

    Department of Biochemical Sciences A. Rossi Fanelli, CNR Institute of Molecular Biology and Pathology and Istituto Pasteur-Fondazione Cenci Bolognetti, Sapienza University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
THIOREDOXIN GLUTATHIONE REDUCTASEA598Schistosoma mansoniMutation(s): 0 
Gene Names: TGR
EC: 1.6.4.5
Find proteins for Q962Y6 (Schistosoma mansoni)
Explore Q962Y6 
Go to UniProtKB:  Q962Y6
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FAD
Query on FAD

Download Ideal Coordinates CCD File 
B [auth A]FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
 Ligand Interaction
PG4
Query on PG4

Download Ideal Coordinates CCD File 
I [auth A]TETRAETHYLENE GLYCOL
C8 H18 O5
UWHCKJMYHZGTIT-UHFFFAOYSA-N
 Ligand Interaction
PEG
Query on PEG

Download Ideal Coordinates CCD File 
C [auth A], D [auth A], E [auth A], F [auth A]DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
 Ligand Interaction
GOL
Query on GOL

Download Ideal Coordinates CCD File 
G [auth A], H [auth A]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.190 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 141.595α = 90
b = 102.785β = 112.39
c = 59.216γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
PDBSETphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-07-21
    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: 2019-01-30
    Changes: Data collection, Experimental preparation