1KM3

crystal structure of ODCase mutant K42A complexed with 6-azaUMP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.162 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Mapping the active site-ligand interactions of orotidine 5'-monophosphate decarboxylase by crystallography.

Wu, N.Gillon, W.Pai, E.F.

(2002) Biochemistry 41: 4002-4011

  • DOI: 10.1021/bi015758p
  • Primary Citation of Related Structures:  
    1KLY, 1KM6, 1KM5, 1KM4, 1KM3, 1KLZ, 1KM2, 1KM1, 1KM0

  • PubMed Abstract: 
  • The crystal structures of orotidine 5'-monophosphate decarboxylases from four different sources have been published recently. However, the detailed mechanism of catalysis of the most proficient enzyme known to date remains elusive. As the ligand-protein interactions at the orotate binding site are crucial to the understanding of this enzyme, we mutated several of the residues surrounding the aromatic part of the substrate, individually and in combination ...

    The crystal structures of orotidine 5'-monophosphate decarboxylases from four different sources have been published recently. However, the detailed mechanism of catalysis of the most proficient enzyme known to date remains elusive. As the ligand-protein interactions at the orotate binding site are crucial to the understanding of this enzyme, we mutated several of the residues surrounding the aromatic part of the substrate, individually and in combination. The ensuing effects on enzyme structure and stability were characterized by X-ray crystallography of inhibitor, product, or substrate complexes and by chemical denaturation with guanidine hydrochloride, respectively. The results are consistent with the residues K42D70K72D75B being charged and forming an 'alternate charge network' around the reactive part of the substrate. In addition to exerting charge-charge repulsion on the orotate carboxylate, Asp70 also makes a crucial contribution to enzyme stability. Consequently, orotidine 5'-monophosphate decarboxylases seem to require the presence of a negative charge at this position for catalysis as well as for correct and stable folding.


    Organizational Affiliation

    Department of Biochemistry, Centres of Excellence, University of Toronto, 1 King's College Circle, Toronto, Ontario M5S 1A8, Canada.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
OROTIDINE 5'-PHOSPHATE DECARBOXYLASEA247Methanothermobacter thermautotrophicusMutation(s): 2 
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
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
UP6
Query on UP6

Download Ideal Coordinates CCD File 
B [auth A]6-AZA URIDINE 5'-MONOPHOSPHATE
C8 H12 N3 O9 P
LRVZOSYMNMNQFR-SHUUEZRQSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
UP6Ki:  12400   nM  BindingDB
UP6Ki :  12400   nM  PDBBind
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.162 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 58.355α = 90
b = 103.178β = 90
c = 73.512γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-06-28
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance