1DBT

CRYSTAL STRUCTURE OF OROTIDINE 5'-MONOPHOSPHATE DECARBOXYLASE FROM BACILLUS SUBTILIS COMPLEXED WITH UMP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.193 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The crystal structure and mechanism of orotidine 5'-monophosphate decarboxylase.

Appleby, T.C.Kinsland, C.Begley, T.P.Ealick, S.E.

(2000) Proc.Natl.Acad.Sci.USA 97: 2005-2010

  • DOI: 10.1073/pnas.259441296

  • PubMed Abstract: 
  • The crystal structure of Bacillus subtilis orotidine 5'-monophosphate (OMP) decarboxylase with bound uridine 5'-monophosphate has been determined by multiple wavelength anomalous diffraction phasing techniques and refined to an R-factor of 19.3% at 2 ...

    The crystal structure of Bacillus subtilis orotidine 5'-monophosphate (OMP) decarboxylase with bound uridine 5'-monophosphate has been determined by multiple wavelength anomalous diffraction phasing techniques and refined to an R-factor of 19.3% at 2.4 A resolution. OMP decarboxylase is a dimer of two identical subunits. Each monomer consists of a triosephosphate isomerase barrel and contains an active site that is located across one end of the barrel and near the dimer interface. For each active site, most of the residues are contributed by one monomer with a few residues contributed from the adjacent monomer. The most highly conserved residues are located in the active site and suggest a novel catalytic mechanism for decarboxylation that is different from any previously proposed OMP decarboxylase mechanism. The uridine 5'-monophosphate molecule is bound to the active site such that the phosphate group is most exposed and the C5-C6 edge of the pyrimidine base is most buried. In the proposed catalytic mechanism, the ground state of the substrate is destabilized by electrostatic repulsion between the carboxylate of the substrate and the carboxylate of Asp60. This repulsion is reduced in the transition state by shifting negative charge from the carboxylate to C6 of the pyrimidine, which is close to the protonated amine of Lys62. We propose that the decarboxylation of OMP proceeds by an electrophilic substitution mechanism in which decarboxylation and carbon-carbon bond protonation by Lys62 occur in a concerted reaction.


    Organizational Affiliation

    Department of Chemistry, Cornell University, Ithaca, NY 14853, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
OROTIDINE 5'-PHOSPHATE DECARBOXYLASE
A, B, C
239Bacillus subtilis (strain 168)Mutation(s): 0 
Gene Names: pyrF
EC: 4.1.1.23
Find proteins for P25971 (Bacillus subtilis (strain 168))
Go to UniProtKB:  P25971
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
U5P
Query on U5P

Download SDF File 
Download CCD File 
A, B, C
URIDINE-5'-MONOPHOSPHATE
C9 H13 N2 O9 P
DJJCXFVJDGTHFX-XVFCMESISA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
U5PKi: 460000 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.193 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 78.410α = 90.00
b = 89.760β = 90.00
c = 105.900γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
SCALEPACKdata scaling
DENZOdata reduction
MLPHAREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-03-06
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance