3NVY

Crystal Structure of Bovine Xanthine Oxidase in Complex with Quercetin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.194 

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This is version 1.3 of the entry. See complete history


Literature

X-ray Crystal Structure of a Xanthine Oxidase Complex with the Flavonoid Inhibitor Quercetin.

Cao, H.Pauff, J.M.Hille, R.

(2014) J Nat Prod 77: 1693-1699

  • DOI: https://doi.org/10.1021/np500320g
  • Primary Citation of Related Structures:  
    3NVY

  • PubMed Abstract: 

    Xanthine oxidase catalyzes the sequential hydroxylation of hypoxanthine to uric acid via xanthine as intermediate. Deposition of crystals of the catalytic product uric acid or its monosodium salt in human joints with accompanying joint inflammation is the major cause of gout. Natural flavonoids are attractive leads for rational design of preventive and therapeutic xanthine oxidase inhibitors due to their beneficial antioxidant, anti-inflammatory, and antiproliferative activities in addition to their micromolar inhibitory activities toward xanthine oxidase. We determined the first complex X-ray structure of mammalian xanthine oxidase with the natural flavonoid inhibitor quercetin at 2.0 Å resolution. The inhibitor adopts a single orientation with its benzopyran moiety sandwiched between Phe 914 and Phe 1009 and ring B pointing toward the solvent channel leading to the molybdenum active center. The favorable steric complementarity of the conjugated three-ring structure of quercetin with the active site and specific hydrogen-bonding interactions of exocyclic hydroxy groups with catalytically relevant residues Arg 880 and Glu 802 correlate well with a previously reported structure-activity relationship of flavonoid inhibitors of xanthine oxidase. The current complex provides a structural basis for the rational design of flavonoid-type inhibitors against xanthine oxidase useful for the treatment of hyperuricemia, gout, and inflammatory disease states.


  • Organizational Affiliation

    Department of Biochemistry, University of California , Riverside, California 92521, United States.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Xanthine dehydrogenase/oxidaseA,
D [auth J]
164Bos taurusMutation(s): 0 
EC: 1.17.1.4 (PDB Primary Data), 1.17.3.2 (PDB Primary Data)
UniProt
Find proteins for P80457 (Bos taurus)
Explore P80457 
Go to UniProtKB:  P80457
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP80457
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Xanthine dehydrogenase/oxidaseB,
E [auth K]
334Bos taurusMutation(s): 0 
EC: 1.17.1.4 (PDB Primary Data), 1.17.3.2 (PDB Primary Data)
UniProt
Find proteins for P80457 (Bos taurus)
Explore P80457 
Go to UniProtKB:  P80457
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP80457
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Xanthine dehydrogenase/oxidaseC,
F [auth L]
756Bos taurusMutation(s): 0 
EC: 1.17.1.4 (PDB Primary Data), 1.17.3.2 (PDB Primary Data)
UniProt
Find proteins for P80457 (Bos taurus)
Explore P80457 
Go to UniProtKB:  P80457
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP80457
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 
I [auth B],
O [auth K]
FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
MTE
Query on MTE

Download Ideal Coordinates CCD File 
J [auth C],
P [auth L]
PHOSPHONIC ACIDMONO-(2-AMINO-5,6-DIMERCAPTO-4-OXO-3,7,8A,9,10,10A-HEXAHYDRO-4H-8-OXA-1,3,9,10-TETRAAZA-ANTHRACEN-7-YLMETHYL)ESTER
C10 H14 N5 O6 P S2
HPEUEJRPDGMIMY-IFQPEPLCSA-N
QUE
Query on QUE

Download Ideal Coordinates CCD File 
L [auth C],
R [auth L]
3,5,7,3',4'-PENTAHYDROXYFLAVONE
C15 H10 O7
REFJWTPEDVJJIY-UHFFFAOYSA-N
FES
Query on FES

Download Ideal Coordinates CCD File 
G [auth A],
H [auth A],
M [auth J],
N [auth J]
FE2/S2 (INORGANIC) CLUSTER
Fe2 S2
NIXDOXVAJZFRNF-UHFFFAOYSA-N
MOS
Query on MOS

Download Ideal Coordinates CCD File 
K [auth C],
Q [auth L]
DIOXOTHIOMOLYBDENUM(VI) ION
H Mo O2 S
BDSRWPHSAKXXRG-UHFFFAOYSA-M
Binding Affinity Annotations 
IDSourceBinding Affinity
QUE BindingDB:  3NVY Ki: min: 280, max: 1200 (nM) from 2 assay(s)
IC50: min: 2620, max: 3.19e+4 (nM) from 5 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.194 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 132.686α = 90
b = 73.398β = 97.13
c = 138.21γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
MOSFLMdata reduction
SCALAdata scaling
CCP4phasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-01-19
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2014-09-03
    Changes: Database references
  • Version 1.3: 2024-02-21
    Changes: Data collection, Database references, Derived calculations