International Journal of the Biology, Chemistry, Physics, and Technology of Wood
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Depolymerization of Straw Lignin by Manganese Peroxidase from Nematoloma frowardii is Accompanied by Release of Carbon Dioxide
Citation Information: Holzforschung. Volume 53, Issue 2, Pages 161–166, ISSN (Print) 0018-3830, DOI: 10.1515/HF.1999.027, June 2005
- Published Online:
Manganese peroxidase preparations (MnP) from the white-rot fungus Nematoloma frowardii were able to release 14CO2 directly from 14C-labeled milled wheat straw (MWS; total lignin fraction) and milled straw lignin (MSL; dioxane soluble part of MWS). Apart from the formation of 14CO2 (4–10 %) the treatment of insoluble MWS and MSL with MnP resulted in the formation of water-soluble 14C-lignin fragments (lignin solubilization, 14–25%). Analyses with gel permeation chromatography (GPC) demonstrated the formation of lignin fragments with predominant molecular masses around 1 kDa. The extent of MWS mineralization and solubilization was enhanced in the presence of reduced glutathione (GSH) acting as thiol mediator, whereas MSL mineralization was not stimulated by GSH. The principle of direct extracellular mineralization of lignin catalyzed by the MnP system may make a significant contribution to the formation of carbon dioxide in lignincellulose containing habitats.
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