1TYT

CRYSTAL AND MOLECULAR STRUCTURE OF CRITHIDIA FASCICULATA TRYPANOTHIONE REDUCTASE AT 2.6 ANGSTROMS RESOLUTION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Work: 0.161 
  • R-Value Observed: 0.161 

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This is version 1.3 of the entry. See complete history


Literature

Structure of trypanothione reductase from Crithidia fasciculata at 2.6 A resolution; enzyme-NADP interactions at 2.8 A resolution.

Bailey, S.Fairlamb, A.H.Hunter, W.N.

(1994) Acta Crystallogr D Biol Crystallogr 50: 139-154

  • DOI: https://doi.org/10.1107/S0907444993011898
  • Primary Citation of Related Structures:  
    1TYT

  • PubMed Abstract: 

    Trypanothione reductase is an FAD-dependent disulfide oxidoreductase which catalyses the reduction of trypanothione using NADPH as co-factor. The enzyme is unique to protozoan parasites from the genera Trypanosoma and Leishmania and is an important target for the design of improved antitrypanocidal drugs. We present details of the structure of trypanothione reductase from Crithidia fasciculata solved by molecular replacement, using human glutathione reductase as a search model, and refined to an R factor of 16.1% with data between 8.0 and 2.6 A resolution. The model comprises two subunits (one containing 487 residues, the other 486), an FAD prosthetic group, plus 392 solvent molecules. The last four C-terminal residues are not seen in either subunit and the density is poor for the N-terminal residue of subunit B. The model has a root-mean-square deviation from ideality of 0.016 A for bond lengths and 3.2 degrees for bond angles. Each subunit was independently refined in the latter stages of the analysis but the subunits remain similar as indicated by the root-mean-square deviation of 0.35 A for C(alpha) atoms. Trypanothione reductase has 36% sequence identity with human glutathione reductase and the root-mean-square deviation between the 462 C(alpha) atoms in the secondary structural units common to the two proteins is 1.1 A. However, there are large differences in the loop regions and significant shifts in the orientation of the four domains within each subunit. Domain II, which binds the dinucleotide co-factor, and domain IV, which forms the interface between the two subunits, are both rotated by approximately 5 degrees with respect to domain I, which binds the FAD moiety, when compared with glutathione reductase. Crystals of trypanothione reductase have been soaked in the dinucleotide co-factor NADPH and N(1)-glutathionylspermidine disulfide substrate and the structure of the resulting complex determined at 2.8 A resolution. Strong density is observed for the adenosine end of the co-factor which forms many charged interactions with the protein though the density for the nicotinamide moiety is more diffuse. The mode of binding indicates that NADP is bound to the enzyme in a similar conformation to that observed with human glutathione reductase.


  • Organizational Affiliation

    Department of Chemistry, University of Manchester, England.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TRYPANOTHIONE REDUCTASE, OXIDIZED FORM
A, B
487Crithidia fasciculataMutation(s): 0 
EC: 1.6.4.8
UniProt
Find proteins for P39040 (Crithidia fasciculata)
Explore P39040 
Go to UniProtKB:  P39040
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP39040
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Work: 0.161 
  • R-Value Observed: 0.161 
  • Space Group: P 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 128.8α = 90
b = 128.8β = 90
c = 92.5γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
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: 1994-07-31
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-06-05
    Changes: Data collection, Database references, Derived calculations, Other