Role of laccase in lignin degradation by white-rot fungi |
| |
Authors: | Hong-Duk Youn Yung Chil Hah Sa-Ouk Kang |
| |
Institution: | Department of Microbiology, College of Natural Sciences, and Research Center for Molecular Microbiology, Seoul National University, Seoul 151-742, South Korea |
| |
Abstract: | Abstract Laccase is commonly found in white-rot fungi and catalyses the abstraction of one electron from the phenolic hydroxyl group to polymerize or depolymerize lignin model compounds. Laccase degrades both β-1 and β-O-4 dimers via C α - C β cleavage, C α oxidation and alkyl-aryl cleavage. Also, aromatic ring cleavage may be detected following the action of laccase. Laccase can also oxidize non-phenolic compounds when primary mediators, such as 2,2'-azinobis(3-ethylbenzthiazoline-6-sulfonate), are co-present. Laccase produces Mn(III) chelates which allow wood-decaying enzymes to penetrate wood cell walls. Laccase is considered to be capable of degrading lignin together with lignin peroxidase and manganese peroxidase. |
| |
Keywords: | Laccase Phenoxy radical Lignin degradation White-rot fungi |
|
|