1MXF

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.197 

wwPDB Validation 3D Report Full Report


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

  • 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 biolog ...

    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.,Sect.D 57: 1671


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PTERIDINE REDUCTASE 2
A, B, C, D
276Trypanosoma cruziGene Names: ptr2
Find proteins for Q8I814 (Trypanosoma cruzi)
Go to UniProtKB:  Q8I814
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MTX
Query on MTX

Download SDF File 
Download CCD File 
A, B, C, D
METHOTREXATE
C20 H22 N8 O5
FBOZXECLQNJBKD-ZDUSSCGKSA-N
 Ligand Interaction
NDP
Query on NDP

Download SDF File 
Download CCD File 
A, B, C, D
NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H30 N7 O17 P3
ACFIXJIJDZMPPO-NNYOXOHSSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C, D
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.197 
  • Space Group: P 31
Unit Cell:
Length (Å)Angle (°)
a = 74.790α = 90.00
b = 74.790β = 90.00
c = 180.990γ = 120.00
Software Package:
Software NamePurpose
CNSrefinement
SOLVEphasing
X-GENdata scaling
X-GENdata reduction
HKL-2000data reduction
HKL-2000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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