Oxygen activation during oxidation of methoxyhydroquinones by laccase from Pleurotus eryngii
Article Abstract:
The conversion of semiquinones to quinones by laccase can proceed via autooxidation, laccase oxidation, and dismutation. Laccase is an enyzme produced by white-rot basidiomycetes that can depolymerize lignan.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 2000
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A search for ligninolytic peroxidases in the fungus Pleurotus eryngii involving alpha-keto-gamma-thiomethylbutyric acid and lignin model dimers
Article Abstract:
The oxidation properties of Pleurotus eryngii cultures and extracellular proteins have been studied by investigating the release of ethylene from alpha-keto-gamma-thiomethylbutyric acid (KTBA). KTBA-oxidizing enzymes have been purified from supernatants of liquid cultures and from wheat straw treated with the fungus under solid-state fermentation conditions. Results indicated that P. eryngii produces three types of peroxidases, but not lignin peroxidase, that can oxidize lignin.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1999
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Mechanism of peroxidase inactivation in liquid cultures of the ligninolytic fungus Pleurotus pulmonarius
Article Abstract:
Peroxidase inactivation in Pleurotus pulmonarius has been studied. The enzyme can oxidize Mn2+ as well as phenolic and nonphenolic aromatic compounds. The enzyme has a peak activity of 1,000 U/liter but is very unstable. It has been discovered that reducing the concentration of H2O2 contributes to the instability which attained a level of 200 microM when filtrates were incubated for several hours. The inhibition of peroxidase activity coincided with the biosynthesis of anisylic compounds and a decrease in the pH of the culture.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1999
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