2YAU

X-ray structure of the Leishmania infantum tryopanothione reductase in complex with auranofin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.5 Å
  • R-Value Free: 0.319 
  • R-Value Work: 0.267 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

A Gold-Containing Drug Against Parasitic Polyamine Metabolism: The X-Ray Structure of Trypanothione Reductase from Leishmania Infantum in Complex with Auranofin Reveals a Dual Mechanism of Enzyme Inhibition.

Ilari, A.Baiocco, P.Messori, L.Fiorillo, A.Boffi, A.Gramiccia, M.Di Muccio, T.Colotti, G.

(2012) Amino Acids 42: 803

  • DOI: 10.1007/s00726-011-0997-9

  • PubMed Abstract: 
  • Auranofin is a gold(I)-containing drug in clinical use as an antiarthritic agent. Recent studies showed that auranofin manifests interesting antiparasitic actions very likely arising from inhibition of parasitic enzymes involved in the control of the ...

    Auranofin is a gold(I)-containing drug in clinical use as an antiarthritic agent. Recent studies showed that auranofin manifests interesting antiparasitic actions very likely arising from inhibition of parasitic enzymes involved in the control of the redox metabolism. Trypanothione reductase is a key enzyme of Leishmania infantum polyamine-dependent redox metabolism, and a validated target for antileishmanial drugs. As trypanothione reductase contains a dithiol motif at its active site and gold(I) compounds are known to be highly thiophilic, we explored whether auranofin might behave as an effective enzyme inhibitor and as a potential antileishmanial agent. Notably, enzymatic assays revealed that auranofin causes indeed a pronounced enzyme inhibition. To gain a deeper insight into the molecular basis of enzyme inhibition, crystals of the auranofin-bound enzyme, in the presence of NADPH, were prepared, and the X-ray crystal structure of the auranofin-trypanothione reductase-NADPH complex was solved at 3.5 Å resolution. In spite of the rather low resolution, these data were of sufficient quality as to identify the presence of the gold center and of the thiosugar of auranofin, and to locate them within the overall protein structure. Gold binds to the two active site cysteine residues of TR, i.e. Cys52 and Cys57, while the thiosugar moiety of auranofin binds to the trypanothione binding site; thus auranofin appears to inhibit TR through a dual mechanism. Auranofin kills the promastigote stage of L. infantum at micromolar concentration; these findings will contribute to the design of new drugs against leishmaniasis.


    Organizational Affiliation

    Department of Biochemical Sciences, Institute of Molecular Biology and Pathology CNR, Sapienza University of Rome, P.le A. Moro 5, 00185, Rome, Italy. Andrea.ilari@uniroma1.it




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TRYPANOTHIONE REDUCTASE
A, B
511Leishmania infantumGene Names: TRYR
EC: 1.8.1.12
Find proteins for A4HSF7 (Leishmania infantum)
Go to UniProtKB:  A4HSF7
Small Molecules
Ligands 6 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CL
Query on CL

Download SDF File 
Download CCD File 
A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
FAD
Query on FAD

Download SDF File 
Download CCD File 
A, B
FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
 Ligand Interaction
AU
Query on AU

Download SDF File 
Download CCD File 
A, B
GOLD ION
Au
ZBKIUFWVEIBQRT-UHFFFAOYSA-N
 Ligand Interaction
TS8
Query on TS8

Download SDF File 
Download CCD File 
A, B
3,4,5-TRIACETYLOXY-6-(ACETYLOXYMETHYL)OXANE-2-THIOL
C14 H20 O9 S
SFOZKJGZNOBSHF-RGDJUOJXSA-N
 Ligand Interaction
NDP
Query on NDP

Download SDF File 
Download CCD File 
A, B
NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H30 N7 O17 P3
ACFIXJIJDZMPPO-NNYOXOHSSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.5 Å
  • R-Value Free: 0.319 
  • R-Value Work: 0.267 
  • Space Group: P 41
Unit Cell:
Length (Å)Angle (°)
a = 103.058α = 90.00
b = 103.058β = 90.00
c = 191.604γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
REFMACrefinement
DENZOdata reduction
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-01-11
    Type: Initial release
  • Version 1.1: 2012-02-08
    Type: Other