ENZYME entry: EC 1.11.1.14

Accepted Name

lignin peroxidase

Alternative Name(s)

diarylpropane oxygenase

diarylpropane peroxidase

ligninase I

LiP

Reaction catalysed

1-(3,4-dimethoxyphenyl)-2-(2-methoxyphenoxy)propane-1,3-diol + H2O2 <=> 3,4-dimethoxybenzaldehyde + glycolaldehyde + guaiacol + H2O
2 (3,4-dimethoxyphenyl)methanol + H2O2 <=> 2 (3,4-dimethoxyphenyl)methanol radical + 2 H2O

Comment(s)

Involved in the oxidative breakdown of lignin by white-rot basidiomycete fungi.
The reaction involves an initial oxidation of the heme iron by hydrogen peroxide, forming compound I (Fe(IV)=O radical cation) at the active site.
A single one-electron reduction of compound I by an electron derived from a substrate molecule yields compound II (Fe(IV)=O non-radical cation), followed by a second one-electron transfer that returns the enzyme to the ferric oxidation state.
The electron transfer events convert the substrate molecule into a transient cation radical intermediate that fragments spontaneously.
The enzyme can act on a wide range of aromatic compounds, including methoxybenzenes and nonphenolic beta-O-4 linked arylglycerol beta- aryl ethers, but cannot act directly on the lignin molecule, which is too large to fit into the active site.
However larger lignin molecules can be degraded in the presence of veratryl alcohol.
It has been suggested that the free radical that is formed when the enzyme acts on veratryl alcohol can diffuse into the lignified cell wall, where it oxidizes lignin and other organic substrates.
In the presence of high concentration of hydrogen peroxide and lack of substrate, the enzyme forms a catalytically inactive form (compound III).
This form can be rescued by interaction with two molecules of the free radical products.
In the case of veratryl alcohol, such an interaction yields two molecules of veratryl aldehyde.

Cross-references

BRENDA

EC2PDB

ExplorEnz

PRIAM enzyme-specific profiles

KEGG Ligand Database for Enzyme Nomenclature

IUBMB Enzyme Nomenclature

IntEnz

MEDLINE

MetaCyc

Rhea expert-curated reactions

UniProtKB/Swiss-Prot

All UniProtKB/Swiss-Prot entries referenced in this entry, with possibility to download in different formats, align etc.

All ENZYME / UniProtKB/Swiss-Prot entries corresponding to 1.11.1.-
All ENZYME / UniProtKB/Swiss-Prot entries corresponding to 1.11.-.-
All ENZYME / UniProtKB/Swiss-Prot entries corresponding to 1.-.-.-