4C7Z

Aldehyde Oxidoreductase from Desulfovibrio gigas (MOP), activated with sodium dithionite and sodium sulfide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.156 
  • R-Value Work: 0.135 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Kinetic and Structural Studies of Aldehyde Oxidoreductase from Desulfovibrio Gigas Reveal a Dithiolene-Based Chemistry for Enzyme Activation and Inhibition by H2O2.

Marangon, J.Correia, H.D.Brondino, C.D.Moura, J.J.G.Romao, M.J.Gonzalez, P.J.Santos-Silva, T.

(2013) Plos One 8: 83234

  • DOI: 10.1371/journal.pone.0083234
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Mononuclear Mo-containing enzymes of the xanthine oxidase (XO) family catalyze the oxidative hydroxylation of aldehydes and heterocyclic compounds. The molybdenum active site shows a distorted square-pyramidal geometry in which two ligands, a hydroxy ...

    Mononuclear Mo-containing enzymes of the xanthine oxidase (XO) family catalyze the oxidative hydroxylation of aldehydes and heterocyclic compounds. The molybdenum active site shows a distorted square-pyramidal geometry in which two ligands, a hydroxyl/water molecule (the catalytic labile site) and a sulfido ligand, have been shown to be essential for catalysis. The XO family member aldehyde oxidoreductase from Desulfovibrio gigas (DgAOR) is an exception as presents in its catalytically competent form an equatorial oxo ligand instead of the sulfido ligand. Despite this structural difference, inactive samples of DgAOR can be activated upon incubation with dithionite plus sulfide, a procedure similar to that used for activation of desulfo-XO. The fact that DgAOR does not need a sulfido ligand for catalysis indicates that the process leading to the activation of inactive DgAOR samples is different to that of desulfo-XO. We now report a combined kinetic and X-ray crystallographic study to unveil the enzyme modification responsible for the inactivation and the chemistry that occurs at the Mo site when DgAOR is activated. In contrast to XO, which is activated by resulfuration of the Mo site, DgAOR activation/inactivation is governed by the oxidation state of the dithiolene moiety of the pyranopterin cofactor, which demonstrates the non-innocent behavior of the pyranopterin in enzyme activity. We also showed that DgAOR incubation with dithionite plus sulfide in the presence of dioxygen produces hydrogen peroxide not associated with the enzyme activation. The peroxide molecule coordinates to molybdenum in a η(2) fashion inhibiting the enzyme activity.


    Organizational Affiliation

    REQUIMTE/CQFB, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Setubal, Portugal.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ALDEHYDE OXIDOREDUCTASE
A
907Desulfovibrio gigasMutation(s): 0 
Gene Names: mop
EC: 1.2.99.7
Find proteins for Q46509 (Desulfovibrio gigas)
Go to UniProtKB:  Q46509
Small Molecules
Ligands 7 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

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A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
PEO
Query on PEO

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A
HYDROGEN PEROXIDE
H2 O2
MHAJPDPJQMAIIY-UHFFFAOYSA-N
 Ligand Interaction
BCT
Query on BCT

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A
BICARBONATE ION
C H O3
BVKZGUZCCUSVTD-UHFFFAOYSA-M
 Ligand Interaction
FES
Query on FES

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

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A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
IPA
Query on IPA

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A
ISOPROPYL ALCOHOL
2-PROPANOL
C3 H8 O
KFZMGEQAYNKOFK-UHFFFAOYSA-N
 Ligand Interaction
PCD
Query on PCD

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A
(MOLYBDOPTERIN-CYTOSINE DINUCLEOTIDE-S,S)-DIOXO-AQUA-MOLYBDENUM(V)
MOLYBDENUM COFACTOR; MOCO
C19 H26 Mo N8 O16 P2 S2
YEBYDVFRFUQMER-NBXMTLLYDD
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
CSO
Query on CSO
A
L-PEPTIDE LINKINGC3 H7 N O3 SCYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.156 
  • R-Value Work: 0.135 
  • Space Group: P 61 2 2
Unit Cell:
Length (Å)Angle (°)
a = 143.170α = 90.00
b = 143.170β = 90.00
c = 162.250γ = 120.00
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
PHASERphasing
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-01-15
    Type: Initial release
  • Version 1.1: 2019-01-30
    Type: Data collection, Experimental preparation
  • Version 1.2: 2019-02-06
    Type: Data collection, Experimental preparation