1GT8

DIHYDROPYRIMIDINE DEHYDROGENASE (DPD) FROM PIG, TERNARY COMPLEX WITH NADPH AND URACIL-4-ACETIC ACID


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.214 

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Ligand Structure Quality Assessment 


This is version 2.0 of the entry. See complete history


Literature

Crystal structure of the productive ternary complex of dihydropyrimidine dehydrogenase with NADPH and 5-iodouracil. Implications for mechanism of inhibition and electron transfer.

Dobritzsch, D.Ricagno, S.Schneider, G.Schnackerz, K.D.Lindqvist, Y.

(2002) J Biol Chem 277: 13155-13166

  • DOI: https://doi.org/10.1074/jbc.M111877200
  • Primary Citation of Related Structures:  
    1GT8, 1GTE, 1GTH

  • PubMed Abstract: 

    Dihydroprymidine dehydrogenase catalyzes the first and rate-limiting step in pyrimidine degradation by converting pyrimidines to the corresponding 5,6- dihydro compounds. The three-dimensional structures of a binary complex with the inhibitor 5-iodouracil and two ternary complexes with NADPH and the inhibitors 5-iodouracil and uracil-4-acetic acid were determined by x-ray crystallography. In the ternary complexes, NADPH is bound in a catalytically competent fashion, with the nicotinamide ring in a position suitable for hydride transfer to FAD. The structures provide a complete picture of the electron transfer chain from NADPH to the substrate, 5-iodouracil, spanning a distance of 56 A and involving FAD, four [Fe-S] clusters, and FMN as cofactors. The crystallographic analysis further reveals that pyrimidine binding triggers a conformational change of a flexible active-site loop in the alpha/beta-barrel domain, resulting in placement of a catalytically crucial cysteine close to the bound substrate. Loop closure requires physiological pH, which is also necessary for correct binding of NADPH. Binding of the voluminous competitive inhibitor uracil-4-acetic acid prevents loop closure due to steric hindrance. The three-dimensional structure of the ternary complex enzyme-NADPH-5-iodouracil supports the proposal that this compound acts as a mechanism-based inhibitor, covalently modifying the active-site residue Cys-671, resulting in S-(hexahydro-2,4-dioxo-5-pyrimidinyl)cysteine.


  • Organizational Affiliation

    Division of Molecular Structural Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-17177 Stockholm, Sweden.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DIHYDROPYRIMIDINE DEHYDROGENASE
A, B, C, D
1,025Sus scrofaMutation(s): 0 
EC: 1.3.1.2
UniProt
Find proteins for Q28943 (Sus scrofa)
Explore Q28943 
Go to UniProtKB:  Q28943
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ28943
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
FAD
Query on FAD

Download Ideal Coordinates CCD File 
HA [auth D],
J [auth A],
R [auth B],
Z [auth C]
FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
NDP
Query on NDP

Download Ideal Coordinates CCD File 
AA [auth C],
IA [auth D],
K [auth A],
S [auth B]
NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H30 N7 O17 P3
ACFIXJIJDZMPPO-NNYOXOHSSA-N
FMN
Query on FMN

Download Ideal Coordinates CCD File 
GA [auth D],
I [auth A],
Q [auth B],
Y [auth C]
FLAVIN MONONUCLEOTIDE
C17 H21 N4 O9 P
FVTCRASFADXXNN-SCRDCRAPSA-N
SF4
Query on SF4

Download Ideal Coordinates CCD File 
CA [auth D]
DA [auth D]
E [auth A]
EA [auth D]
F [auth A]
CA [auth D],
DA [auth D],
E [auth A],
EA [auth D],
F [auth A],
FA [auth D],
G [auth A],
H [auth A],
M [auth B],
N [auth B],
O [auth B],
P [auth B],
U [auth C],
V [auth C],
W [auth C],
X [auth C]
IRON/SULFUR CLUSTER
Fe4 S4
LJBDFODJNLIPKO-UHFFFAOYSA-N
UAA
Query on UAA

Download Ideal Coordinates CCD File 
BA [auth C],
JA [auth D],
L [auth A],
T [auth B]
URACIL-6-ACETIC ACID
C6 H6 N2 O4
NQAUNZZEYKWTHM-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.214 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.03α = 90
b = 159.53β = 97.16
c = 166.02γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALAdata scaling
AMoREphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-04-11
    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: 2018-02-07
    Changes: Source and taxonomy
  • Version 2.0: 2019-01-23
    Changes: Atomic model, Data collection, Database references, Derived calculations