2ET7 image
Entry Detail
PDB ID:
2ET7
Keywords:
Title:
Structural and spectroscopic insights into the mechanism of oxalate oxidase
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2005-10-27
Release Date:
2005-11-22
Method Details:
Experimental Method:
Resolution:
1.70 Å
R-Value Free:
0.21
R-Value Work:
0.16
R-Value Observed:
0.16
Space Group:
H 3 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Oxalate oxidase 1
Mutations:n75a
Chain IDs:A
Chain Length:201
Number of Molecules:1
Biological Source:Hordeum vulgare
Ligand Molecules
Primary Citation
Structural and spectroscopic studies shed light on the mechanism of oxalate oxidase
J.Biol.Chem. 281 6428 6433 (2006)
PMID: 16291738 DOI: 10.1074/jbc.M510256200

Abstact

Oxalate oxidase (EC 1.2.3.4) catalyzes the conversion of oxalate and dioxygen to hydrogen peroxide and carbon dioxide. In this study, glycolate was used as a structural analogue of oxalate to investigate substrate binding in the crystalline enzyme. The observed monodentate binding of glycolate to the active site manganese ion of oxalate oxidase is consistent with a mechanism involving C-C bond cleavage driven by superoxide anion attack on a monodentate coordinated substrate. In this mechanism, the metal serves two functions: to organize the substrates (oxalate and dioxygen) and to transiently reduce dioxygen. The observed structure further implies important roles for specific active site residues (two asparagines and one glutamine) in correctly orientating the substrates and reaction intermediates for catalysis. Combined spectroscopic, biochemical, and structural analyses of mutants confirms the importance of the asparagine residues in organizing a functional active site complex.

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