D312N mutant of human orotidyl-5'-monophosphate decarboxylase in complex with 6-azido-UMP, covalent adduct

Experimental Data Snapshot

  • Resolution: 1.30 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.169 

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Lys314 is a nucleophile in non-classical reactions of orotidine-5'-monophosphate decarboxylase

Heinrich, D.Diederichsen, U.Rudolph, M.G.

(2009) Chemistry 15: 6619-6625

  • DOI: https://doi.org/10.1002/chem.200900397
  • Primary Citation of Related Structures:  
    3EWU, 3EWW, 3EWX, 3EWY, 3EWZ, 3EX1, 3EX2, 3EX3, 3EX4, 3EX6, 3L0K, 3L0N

  • PubMed Abstract: 

    Orotidine-5'-monophosphate decarboxylase (OMPD) catalyzes the decarboxylation of orotidine-5'-monophosphate (OMP) to uridine-5'-monophosphate (UMP) in an extremely proficient manner. The reaction does not require any cofactors and proceeds by an unknown mechanism. In addition to decarboxylation, OMPD is able to catalyze other reactions. We show that several C6-substituted UMP derivatives undergo hydrolysis or substitution reactions that depend on a lysine residue (Lys314) in the OMPD active site. 6-Cyano-UMP is converted to UMP, and UMP derivatives with good leaving groups inhibit OMPD by a suicide mechanism in which Lys314 covalently binds to the substrate. These non-classical reactivities of human OMPD were characterized by cocrystallization and freeze-trapping experiments with wild-type OMPD and two active-site mutants by using substrate and inhibitor nucleotides. The structures show that the C6-substituents are not coplanar with the pyrimidine ring. The extent of this substrate distortion is a function of the substituent geometry. Structure-based mechanisms for the reaction of 6-substituted UMP derivatives are extracted in accordance with results from mutagenesis, mass spectrometry, and OMPD enzyme activity. The Lys314-based mechanisms explain the chemodiversity of OMPD, and offer a strategy to design mechanism-based inhibitors that could be used for antineoplastic purposes for example.

  • Organizational Affiliation

    Institut für Organische und Biomolekulare Chemie, Georg-August-Universität Göttingen, Tammannstrasse 2, 37077 Göttingen, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Orotidine-5'-phosphate decarboxylase
A, B
260Homo sapiensMutation(s): 1 
Gene Names: UMPS
UniProt & NIH Common Fund Data Resources
Find proteins for P11172 (Homo sapiens)
Explore P11172 
Go to UniProtKB:  P11172
PHAROS:  P11172
GTEx:  ENSG00000114491 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP11172
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.30 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.169 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.49α = 90
b = 61.58β = 113.43
c = 70.72γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
SADABSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-04-07
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.2: 2017-10-25
    Changes: Refinement description
  • Version 1.3: 2021-10-20
    Changes: Database references, Derived calculations
  • Version 1.4: 2023-12-27
    Changes: Data collection