4J57

Structure of Plasmodium falciparum thioredoxin reductase-thioredoxin complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.219 

Starting Model: experimental
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This is version 1.4 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: https://doi.org/10.1016/j.jmb.2013.06.037
  • Primary Citation of Related Structures:  
    4J56, 4J57

  • 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 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:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Thioredoxin reductase 2
A, B
541Plasmodium falciparum 3D7Mutation(s): 1 
Gene Names: trxr2PFI1170c
EC: 1.8.1.9
UniProt
Find proteins for P61076 (Plasmodium falciparum (isolate 3D7))
Explore P61076 
Go to UniProtKB:  P61076
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP61076
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
ThioredoxinC [auth E],
D [auth F]
114Plasmodium falciparum 3D7Mutation(s): 1 
Gene Names: PF14_0545
UniProt
Find proteins for Q7KQL8 (Plasmodium falciparum (isolate 3D7))
Explore Q7KQL8 
Go to UniProtKB:  Q7KQL8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7KQL8
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.219 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 91.8α = 90
b = 100.6β = 90
c = 142.83γ = 90
Software Package:
Software NamePurpose
PHENIXmodel building
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHENIXphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-07-10
    Type: Initial release
  • Version 1.1: 2013-08-07
    Changes: Database references
  • Version 1.2: 2013-09-11
    Changes: Database references
  • Version 1.3: 2017-11-22
    Changes: Database references
  • Version 1.4: 2024-11-06
    Changes: Data collection, Database references, Derived calculations, Refinement description, Structure summary