1BZL

CRYSTAL STRUCTURE OF TRYPANOSOMA CRUZI TRYPANOTHIONE REDUCTASE IN COMPLEX WITH TRYPANOTHIONE, AND THE STRUCTURE-BASED DISCOVERY OF NEW NATURAL PRODUCT INHIBITORS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Work: 0.209 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Literature

Crystal structure of Trypanosoma cruzi trypanothione reductase in complex with trypanothione, and the structure-based discovery of new natural product inhibitors.

Bond, C.S.Zhang, Y.Berriman, M.Cunningham, M.L.Fairlamb, A.H.Hunter, W.N.

(1999) Structure 7: 81-89

  • DOI: https://doi.org/10.1016/s0969-2126(99)80011-2
  • Primary Citation of Related Structures:  
    1BZL

  • PubMed Abstract: 

    Trypanothione reductase (TR) helps to maintain an intracellular reducing environment in trypanosomatids, a group of protozoan parasites that afflict humans and livestock in tropical areas. This protective function is achieved via reduction of polyamine-glutathione conjugates, in particular trypanothione. TR has been validated as a chemotherapeutic target by molecular genetics methods. To assist the development of new therapeutics, we have characterised the structure of TR from the pathogen Trypanosoma cruzi complexed with the substrate trypanothione and have used the structure to guide database searches and molecular modelling studies. The TR-trypanothione-disulfide structure has been determined to 2.4 A resolution. The chemical interactions involved in enzyme recognition and binding of substrate can be inferred from this structure. Comparisons with the related mammalian enzyme, glutathione reductase, explain why each enzyme is so specific for its own substrate. A CH***O hydrogen bond can occur between the active-site histidine and a carbonyl of the substrate. This interaction contributes to enzyme specificity and mechanism by producing an electronic induced fit when substrate binds. Database searches and molecular modelling using the substrate as a template and the active site as receptor have identified a class of cyclic-polyamine natural products that are novel TR inhibitors. The structure of the TR-trypanothione enzyme-substrate complex provides details of a potentially valuable drug target. This information has helped to identify a new class of enzyme inhibitors as novel lead compounds worthy of further development in the search for improved medicines to treat a range of parasitic infections.


  • Organizational Affiliation

    Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, UK Department of Biochemistry University of Sydney Sydney NSW 2006 Australia.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TRYPANOTHIONE REDUCTASE (OXIDIZED FORM)
A, B
486Trypanosoma cruziMutation(s): 0 
EC: 1.6.4.8 (PDB Primary Data), 1.8.1.12 (UniProt)
UniProt
Find proteins for P28593 (Trypanosoma cruzi)
Explore P28593 
Go to UniProtKB:  P28593
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP28593
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Work: 0.209 
  • Space Group: P 43
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 93.33α = 90
b = 93.33β = 90
c = 157.14γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
CCP4data reduction
X-PLORmodel building
X-PLORrefinement
CCP4data scaling
X-PLORphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-11-10
    Type: Initial release
  • Version 1.1: 2008-04-26
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-08-09
    Changes: Data collection, Database references, Derived calculations, Refinement description
  • Version 1.4: 2024-10-16
    Changes: Structure summary