4J57

Structure of Plasmodium falciparum thioredoxin reductase-thioredoxin complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.216 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Crystal Structure of the Plasmodium falciparum Thioredoxin Reductase-Thioredoxin Complex.

Fritz-Wolf, K.Jortzik, E.Stumpf, M.Preuss, J.Iozef, R.Rahlfs, S.Becker, K.

(2013) J.Mol.Biol. 425: 3446-3460

  • DOI: 10.1016/j.jmb.2013.06.037
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Over the last decades, malaria parasites have been rapidly developing resistance against antimalarial drugs, which underlines the need for novel drug targets. Thioredoxin reductase (TrxR) is crucially involved in redox homeostasis and essential for P ...

    Over the last decades, malaria parasites have been rapidly developing resistance against antimalarial drugs, which underlines the need for novel drug targets. Thioredoxin reductase (TrxR) is crucially involved in redox homeostasis and essential for Plasmodium falciparum. Here, we report the first crystal structure of P. falciparum TrxR bound to its substrate thioredoxin 1. Upon complex formation, the flexible C-terminal arm and an insertion loop of PfTrxR are rearranged, suggesting that the C-terminal arm changes its conformation during catalysis similar to human TrxR. Striking differences between P. falciparum and human TrxR are a Plasmodium-specific insertion and the conformation of the C-terminal arm, which lead to considerable differences in thioredoxin binding and disulfide reduction. Moreover, we functionally analyzed amino acid residues involved in substrate binding and in the architecture of the intersubunit cavity, which is a known binding site for disulfide reductase inhibitors. Cell biological experiments indicate that P. falciparum TrxR is indeed targeted in the parasite by specific inhibitors with antimalarial activity. Differences between P. falciparum and human TrxR and details on substrate reduction and inhibitor binding provide the first solid basis for structure-based drug development and lead optimization.


    Organizational Affiliation

    Interdisciplinary Research Center, Justus Liebig University, D-35392 Giessen, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Thioredoxin reductase 2
A, B
541Plasmodium falciparum (isolate 3D7)Mutation(s): 1 
Gene Names: trxr2
EC: 1.8.1.9
Find proteins for P61076 (Plasmodium falciparum (isolate 3D7))
Go to UniProtKB:  P61076
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Thioredoxin
E, F
114Plasmodium falciparum (isolate 3D7)Mutation(s): 1 
Find proteins for Q7KQL8 (Plasmodium falciparum (isolate 3D7))
Go to UniProtKB:  Q7KQL8
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
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
GOL
Query on GOL

Download SDF File 
Download CCD File 
A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.216 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 91.800α = 90.00
b = 100.600β = 90.00
c = 142.830γ = 90.00
Software Package:
Software NamePurpose
PHENIXmodel building
PHENIXrefinement
XDSdata scaling
XDSdata reduction
PHENIXphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-07-10
    Type: Initial release
  • Version 1.1: 2013-08-07
    Type: Database references
  • Version 1.2: 2013-09-11
    Type: Database references
  • Version 1.3: 2017-11-22
    Type: Database references