1UUO

Rat dihydroorotate dehydrogenase (DHOD)in complex with brequinar


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.44 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.210 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Inhibitor Binding in a Class 2 Dihydroorotate Dehydrogenase Causes Variations in the Membrane-Associated N-Terminal Domain

Hansen, M.Le Nours, J.Johansson, E.Antal, T.Ullrich, A.Loffler, M.Larsen, S.

(2004) Protein Sci 13: 1031

  • DOI: https://doi.org/10.1110/ps.03533004
  • Primary Citation of Related Structures:  
    1UUO

  • PubMed Abstract: 

    The flavin enzyme dihydroorotate dehydrogenase (DHOD; EC 1.3.99.11) catalyzes the oxidation of dihydroorotate to orotate, the fourth step in the de novo pyrimidine biosynthesis of UMP. The enzyme is a promising target for drug design in different biological and clinical applications for cancer and arthritis. The first crystal structure of the class 2 dihydroorotate dehydrogenase from rat has been determined in complex with its two inhibitors brequinar and atovaquone. These inhibitors have shown promising results as anti-proliferative, immunosuppressive, and antiparasitic agents. A unique feature of the class 2 DHODs is their N-terminal extension, which folds into a separate domain comprising two alpha-helices. This domain serves as the binding site for the two inhibitors and the respiratory quinones acting as the second substrate for the class 2 DHODs. The orientation of the first N-terminal helix is very different in the two complexes of rat DHOD (DHODR). Binding of atovaquone causes a 12 A movement of the first residue in the first alpha-helix. Based on the information from the two structures of DHODR, a model for binding of the quinone and the residues important for the interactions could be defined. His 56 and Arg 136, which are fully conserved in all class 2 DHODs, seem to play a key role in the interaction with the electron acceptor. The differences between the membrane-bound rat DHOD and membrane-associated class 2 DHODs exemplified by the Escherichia coli DHOD has been investigated by GRID computations of the hydrophobic probes predicted to interact with the membrane.


  • Organizational Affiliation

    Centre for Crystallographic Studies, Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DIHYDROOROTATE DEHYDROGENASE372Rattus rattusMutation(s): 0 
EC: 1.3.99.11
Membrane Entity: Yes 
UniProt
Find proteins for Q63707 (Rattus norvegicus)
Explore Q63707 
Go to UniProtKB:  Q63707
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ63707
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
FMN
Query on FMN

Download Ideal Coordinates CCD File 
C [auth A]FLAVIN MONONUCLEOTIDE
C17 H21 N4 O9 P
FVTCRASFADXXNN-SCRDCRAPSA-N
BRF
Query on BRF

Download Ideal Coordinates CCD File 
B [auth A]6-FLUORO-2-(2'-FLUORO-1,1'-BIPHENYL-4-YL)-3-METHYLQUINOLINE-4-CARBOXYLIC ACID
C23 H15 F2 N O2
PHEZJEYUWHETKO-UHFFFAOYSA-N
ORO
Query on ORO

Download Ideal Coordinates CCD File 
D [auth A]OROTIC ACID
C5 H4 N2 O4
PXQPEWDEAKTCGB-UHFFFAOYSA-N
NI
Query on NI

Download Ideal Coordinates CCD File 
E [auth A]NICKEL (II) ION
Ni
VEQPNABPJHWNSG-UHFFFAOYSA-N
NA
Query on NA

Download Ideal Coordinates CCD File 
F [auth A]SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
Binding Affinity Annotations 
IDSourceBinding Affinity
BRF BindingDB:  1UUO Ki: 12 (nM) from 1 assay(s)
IC50: min: 0.48, max: 367 (nM) from 16 assay(s)
Binding MOAD:  1UUO IC50: 6 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.44 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.210 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.753α = 90
b = 95.801β = 90
c = 144.469γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
EPMRphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-04-01
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-01-17
    Changes: Data collection
  • Version 1.4: 2019-01-30
    Changes: Data collection, Experimental preparation