2ZCG

Structure and inhibition of orotidine 5'-phosphate decarboxylase from plasmodium falciparum


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.223 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.201 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure and Inhibition of Orotidine 5'-Monophosphate Decarboxylase from Plasmodium falciparum

Langley, D.B.Shojaei, M.Chan, C.Lok, H.C.Mackay, J.P.Traut, T.W.Guss, J.M.Christopherson, R.I.

(2008) Biochemistry 47: 3842-3854

  • DOI: 10.1021/bi702390k

  • PubMed Abstract: 
  • Orotidine 5'-monophosphate (OMP) decarboxylase from Plasmodium falciparum (PfODCase, EC 4.1.1.23) has been overexpressed, purified, subjected to kinetic and biochemical analysis, and crystallized. The native enzyme is a homodimer with a subunit molec ...

    Orotidine 5'-monophosphate (OMP) decarboxylase from Plasmodium falciparum (PfODCase, EC 4.1.1.23) has been overexpressed, purified, subjected to kinetic and biochemical analysis, and crystallized. The native enzyme is a homodimer with a subunit molecular mass of 38 kDa. The saturation curve for OMP as a substrate conformed to Michaelis-Menten kinetics with K m = 350 +/- 60 nM and V max = 2.70 +/- 0.10 micromol/min/mg protein. Inhibition patterns for nucleoside 5'-monophosphate analogues were linear competitive with respect to OMP with a decreasing potency of inhibition of PfODCase in the order: pyrazofurin 5'-monophosphate ( K i = 3.6 +/- 0.7 nM) > xanthosine 5'-monophosphate (XMP, K i = 4.4 +/- 0.7 nM) > 6-azauridine 5'-monophosphate (AzaUMP, K i = 12 +/- 3 nM) > allopurinol-3-riboside 5'-monophosphate ( K i = 240 +/- 20 nM). XMP is an approximately 150-fold more potent inhibitor of PfODCase compared with the human enzyme. The structure of PfODCase was solved in the absence of ligand and displays a classic TIM-barrel fold characteristic of the enzyme. Both the phosphate-binding loop and the betaalpha5-loop have conformational flexibility, which may be associated with substrate capture and product release along the reaction pathway.


    Organizational Affiliation

    School of Molecular and Microbial Biosciences, University of Sydney, Sydney, New South Wales 2006, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Orotidine 5'-phosphate decarboxylase
A, B
323Plasmodium falciparumMutation(s): 0 
Gene Names: ompdc
EC: 4.1.1.23
Find proteins for Q8T6J6 (Plasmodium falciparum)
Go to UniProtKB:  Q8T6J6
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.223 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.201 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 60.929α = 90.00
b = 104.087β = 113.82
c = 62.420γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
MAR345dtbdata collection
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-03-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance