2X99

Thioredoxin glutathione reductase from Schistosoma mansoni in complex with NADPH


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 

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Ligand Structure Quality Assessment 


This is version 1.2 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: https://doi.org/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). 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.


  • 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)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
THIOREDOXIN GLUTATHIONE REDUCTASE598Schistosoma mansoniMutation(s): 0 
EC: 1.6.4.5
UniProt
Find proteins for Q962Y6 (Schistosoma mansoni)
Explore Q962Y6 
Go to UniProtKB:  Q962Y6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ962Y6
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 6 Unique
IDChains Name / 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
NDP
Query on NDP

Download Ideal Coordinates CCD File 
C [auth A]NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H30 N7 O17 P3
ACFIXJIJDZMPPO-NNYOXOHSSA-N
GSH
Query on GSH

Download Ideal Coordinates CCD File 
D [auth A],
E [auth A]
GLUTATHIONE
C10 H17 N3 O6 S
RWSXRVCMGQZWBV-WDSKDSINSA-N
PG4
Query on PG4

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L [auth A],
M [auth A],
N [auth A],
O [auth A],
P [auth A]
TETRAETHYLENE GLYCOL
C8 H18 O5
UWHCKJMYHZGTIT-UHFFFAOYSA-N
PEG
Query on PEG

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G [auth A]
H [auth A]
I [auth A]
J [auth A]
K [auth A]
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
Q [auth A]
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
CA
Query on CA

Download Ideal Coordinates CCD File 
F [auth A]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 141.502α = 90
b = 102.61β = 112.82
c = 59.938γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
PDBSETphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-07-21
    Type: Initial release
  • Version 1.1: 2011-12-07
    Changes: Advisory, Atomic model, Derived calculations, Non-polymer description, Version format compliance
  • Version 1.2: 2017-07-12
    Changes: Advisory, Derived calculations