2E6Y

Covalent complex of orotidine 5'-monophosphate decarboxylase (ODCase) with 6-Iodo-UMP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 
    0.187 (Depositor), 0.180 (DCC) 
  • R-Value Work: 
    0.162 (Depositor), 0.160 (DCC) 
  • R-Value Observed: 
    0.162 (Depositor) 

Starting Models: experimental
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Ligand Structure Quality Assessment 

Created with Raphaël 2.3.0Worse 01 BetterLigand structure goodness of fit to experimental dataBest fitted U5PClick on this verticalbar to view details

This is version 1.5 of the entry. See complete history


Literature

A Potent, Covalent Inhibitor of Orotidine 5'-Monophosphate Decarboxylase with Antimalarial Activity.

Bello, A.M.Poduch, E.Fujihashi, M.Amani, M.Li, Y.Crandall, I.Hui, R.Lee, P.I.Kain, K.C.Pai, E.F.Kotra, L.P.

(2007) J Med Chem 50: 915-921

  • DOI: https://doi.org/10.1021/jm060827p
  • Primary Citation of Related Structures:  
    2E6Y

  • PubMed Abstract: 

    Orotidine 5'-monophosphate decarboxylase (ODCase) has evolved to catalyze the decarboxylation of orotidine 5'-monophosphate without any covalent intermediates. Active site residues in ODCase are involved in an extensive hydrogen-bonding network. We discovered that 6-iodouridine 5'-monophosphate (6-iodo-UMP) irreversibly inhibits the catalytic activities of ODCases from Methanobacterium thermoautotrophicum and Plasmodium falciparum. Mass spectral analysis of the enzyme-inhibitor complex confirms covalent attachment of the inhibitor to ODCase accompanied by the loss of two protons and the iodo moiety. The X-ray crystal structure (1.6 A resolution) of the complex of the inhibitor and ODCase clearly shows the covalent bond formation with the active site Lys-72 [corrected] residue. 6-Iodo-UMP inhibits ODCase in a time- and concentration-dependent fashion. 6-Iodouridine, the nucleoside form of 6-iodo-UMP, exhibited potent antiplasmodial activity, with IC50s of 4.4 +/- 1.3 microM and 6.2 +/- 0.7 microM against P. falciparum ItG and 3D7 isolates, respectively. 6-Iodouridine 5'-monophosphate is a novel covalent inhibitor of ODCase, and its nucleoside analogue paves the way to a new class of inhibitors against malaria.


  • Organizational Affiliation

    Center for Molecular Design and Preformulations, Toronto General Research Institute, Toronto General Hospital, Toronto, ON M5G 2C4 Canada.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Orotidine 5'-phosphate decarboxylase
A, B
252Methanothermobacter thermautotrophicusMutation(s): 2 
Gene Names: pyrF
EC: 4.1.1.23
UniProt
Find proteins for O26232 (Methanothermobacter thermautotrophicus (strain ATCC 29096 / DSM 1053 / JCM 10044 / NBRC 100330 / Delta H))
Explore O26232 
Go to UniProtKB:  O26232
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO26232
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free:  0.187 (Depositor), 0.180 (DCC) 
  • R-Value Work:  0.162 (Depositor), 0.160 (DCC) 
  • R-Value Observed: 0.162 (Depositor) 
Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 58.163α = 90
b = 74.063β = 119.39
c = 59.243γ = 90
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling
CNSphasing

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 

Created with Raphaël 2.3.0Worse 01 BetterLigand structure goodness of fit to experimental dataBest fitted U5PClick on this verticalbar to view details

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-02-27
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2021-11-10
    Changes: Database references, Derived calculations
  • Version 1.4: 2023-10-25
    Changes: Data collection, Refinement description
  • Version 1.5: 2024-10-23
    Changes: Structure summary