1WYG

Crystal Structure of a Rat Xanthine Dehydrogenase Triple Mutant (C535A, C992R and C1324S)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.203 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Mechanism of the Conversion of Xanthine Dehydrogenase to Xanthine Oxidase: IDENTIFICATION OF THE TWO CYSTEINE DISULFIDE BONDS AND CRYSTAL STRUCTURE OF A NON-CONVERTIBLE RAT LIVER XANTHINE DEHYDROGENASE MUTANT

Nishino, T.Okamoto, K.Kawaguchi, Y.Hori, H.Matsumura, T.Eger, B.T.Pai, E.F.Nishino, T.

(2005) J.Biol.Chem. 280: 24888-24894

  • DOI: 10.1074/jbc.M501830200

  • PubMed Abstract: 
  • Mammalian xanthine dehydrogenase can be converted to xanthine oxidase by modification of cysteine residues or by proteolysis of the enzyme polypeptide chain. Here we present evidence that the Cys(535) and Cys(992) residues of rat liver enzyme are ind ...

    Mammalian xanthine dehydrogenase can be converted to xanthine oxidase by modification of cysteine residues or by proteolysis of the enzyme polypeptide chain. Here we present evidence that the Cys(535) and Cys(992) residues of rat liver enzyme are indeed involved in the rapid conversion from the dehydrogenase to the oxidase. The purified mutants C535A and/or C992R were significantly resistant to conversion by incubation with 4,4'-dithiodipyridine, whereas the recombinant wild-type enzyme converted readily to the oxidase type, indicating that these residues are responsible for the rapid conversion. The C535A/C992R mutant, however, converted very slowly during prolonged incubation with 4,4'-dithiodipyridine, and this slow conversion was blocked by the addition of NADH, suggesting that another cysteine couple located near the NAD(+) binding site is responsible for the slower conversion. On the other hand, the C535A/C992R/C1316S and C535A/C992R/C1324S mutants were completely resistant to conversion, even on prolonged incubation with 4,4'-dithiodipyridine, indicating that Cys(1316) and Cys(1324) are responsible for the slow conversion. The crystal structure of the C535A/C992R/C1324S mutant was determined in its demolybdo form, confirming its dehydrogenase conformation.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo 113-8602, Japan. nishino@nms.ac.jp




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Xanthine dehydrogenase/oxidase
A
1331Rattus norvegicusMutation(s): 3 
Gene Names: Xdh
EC: 1.17.1.4, 1.17.3.2
Find proteins for P22985 (Rattus norvegicus)
Go to UniProtKB:  P22985
Small Molecules
Ligands 6 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

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A
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
FAD
Query on FAD

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A
FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
 Ligand Interaction
CA
Query on CA

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A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
FES
Query on FES

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A
FE2/S2 (INORGANIC) CLUSTER
Fe2 S2
NIXDOXVAJZFRNF-UHFFFAOYSA-N
 Ligand Interaction
SAL
Query on SAL

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A
2-HYDROXYBENZOIC ACID
SALICYLIC ACID
C7 H6 O3
YGSDEFSMJLZEOE-UHFFFAOYSA-N
 Ligand Interaction
ACY
Query on ACY

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A
ACETIC ACID
C2 H4 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
SALKi: 100000000 nM (86) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.203 
  • Space Group: I 41 2 2
Unit Cell:
Length (Å)Angle (°)
a = 134.253α = 90.00
b = 134.253β = 90.00
c = 523.315γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
EPMRphasing
HKL-2000data reduction
SCALEPACKdata scaling
HKL-2000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-05-31
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance