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Production and Chemiluminescent Free Radical Reactions of Glyoxal in Lipid Peroxidation of Linoleic Acid by the Ligninolytic Enzyme, Manganese Peroxidase by Takashi Watanabe; Nobuaki Shirai; Hitomi Okada; Yoichi Honda; Masaaki Kuwahara is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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Glyoxal is a key compound involved in glyoxal oxidase (GLOX)‐dependent production of glyoxylate, oxalate and H~2~O~2~ by lignin‐degrading basidiomycetes. In this paper, we report that glyoxal was produced from a metabolite of ligninolytic fungi, linoleic acid, by manganese peroxidase (MnP)‐dependent lipid peroxidation. In the absence of the parent substrate of linoleic acid, the dialdehyde was oxidized by MnP and Mn(III) chelate to start free radical reactions with emission of chemiluminescence at 700–710 nm. The spectroscopic profile of the light emission is distinguishable from (a) singlet oxygen, (b) triplet carbonyls from dioxetane and α‐hydroxyperoxyl radicals, and (c) biacyl triplet formed by the coupling of two acyl radicals. The photon emission of glyoxal by MnP was activated by co‐oxidation of tartrate. The MnP‐dependent oxidation of glyoxal in tartrate buffers continued for 10 days without addition of exogenous H~2~O~2~. The importance of these results is discussed in relation to the free radical chemistry of lignin biodegradation by wood rot fungi.

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Author

Takashi Watanabe; Nobuaki Shirai; Hitomi Okada; Yoichi Honda; Masaaki Kuwahara

Publisher

John Wiley and Sons; Springer; Wiley (Blackwell Publishing); Springer-Verlag; Blackwell Publishing Inc.; Springer Verlag; Wiley; Springer Science and Business Media LLC (ISSN 1432-1327)

Published

2001

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)