1MXF

Crystal Structure of Inhibitor Complex of Putative Pteridine Reductase 2 (PTR2) from Trypanosoma cruzi

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.197 

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This is version 1.3 of the entry. See complete history. 


Literature

Crystal structure of Trypanosoma cruzi pteridine reductase 2 in complex with a substrate and an inhibitor.

Schormann, N., Pal, B., Senkovich, O., Carson, M., Howard, A., Smith, C., Delucas, L., Chattopadhyay, D.

(2005) J Struct Biol 152: 64-75

  • DOI: 10.1016/j.jsb.2005.07.008
  • Primary Citation of Related Structures:  
    1MXH, 1MXF

  • PubMed Abstract: 

    • Reduced pteridines are required for a number of important cellular functions. Trypanosomatid parasites, unlike their mammalian hosts, are pteridine auxotrophs and salvage the precursor pteridines from the host and reduce them to the respective biological ...

    Reduced pteridines are required for a number of important cellular functions. Trypanosomatid parasites, unlike their mammalian hosts, are pteridine auxotrophs and salvage the precursor pteridines from the host and reduce them to the respective biologically active tetrahydro forms using parasite-encoded enzymes. These enzymes may offer selective drug targets. In Leishmania, pteridine reductase 1 (PTR1), the primary enzyme for reducing pterins, is also responsible for resistance to antifolate drugs. Typically, PTR1 is more active with fully oxidized biopterin and folate than with their reduced counterparts. We have identified an enzyme, TcPTR2 of Trypanosoma cruzi, which though very similar to PTR1 in its primary sequence, can reduce only dihydrobiopterin and dihydrofolate and not oxidized pteridines. The structures of an inhibitor (methotrexate) and a substrate (dihydrofolate) complex of this enzyme demonstrate that the orientation of the substrate and the inhibitor in the active site of TcPTR2 are different from each other. However, the orientation of each ligand is similar to that of the corresponding ligand in Leishmania major PTR1 complexes.

    Related Citations: 
    • Expression, purification, crystallization and preliminary crystallographic analysis of recombinant pteridine reductase of Trypanosoma cruzi
      Schormann, N., Pal, B., Chattopadhyay, D.
      (2001) Acta Crystallogr D Biol Crystallogr 57: 1671
    Organizational Affiliation: 

    Center for Biophysical Sciences and Engineering, University of Alabama at Birmingham, Birmingham, AL 35294, USA.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PTERIDINE REDUCTASE 2 A, B, C, D276Trypanosoma cruziMutation(s): 0 
Gene Names: ptr2
Find proteins for Q8I814 (Trypanosoma cruzi)
Explore Q8I814 
Go to UniProtKB:  Q8I814
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE		A,B,C,DL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.197 
  • Space Group: P 31
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.79α = 90
b = 74.79β = 90
c = 180.99γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
X-GENdata reduction
SOLVEphasing
CNSrefinement
HKL-2000data reduction
X-GENdata scaling

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-10-14
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description