期刊
FUNGAL ECOLOGY
卷 5, 期 5, 页码 481-489出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.funeco.2012.05.001
关键词
Cellulose; Decomposition; Glycosyl hydrolase family 61; Metatranscriptomics; Phanerochaete chrysosporium; Postia placenta; Saprotrophic fungi
资金
- Czech Science Foundation [526/08/0751]
- Ministry of Education, Youth and Sports of the Czech Republic [OC10064]
Traditionally, the models of fungal cellulose hydrolysis have included the actions of endo- and exo-cleaving hydrolytic enzymes, with some involvement of nonspecific cellulose hydrolysis by radical-based oxidative reactions. Only recently, the GH61 glycosyl hydrolases have been demonstrated to be copper-containing enzymes - polysaccharide monooxygenases (PMOs) - internally cleaving cellulose molecules in an oxidative way in synergy with cellobiose dehydrogenase and other cellulolytic enzymes. PMOs can be found in most genomes of ascomycetous and basidiomycetous fungi, including plant pathogens, litter decomposers, white-rot and brown-rot fungi and mycorrhizal fungi. Although their real importance in lignocellulose decomposition is still unknown, their high expression level in the presence of lignocelluloses and substantial synergistic enhancement of cellulose hydrolysis in cooperation with other cellulolytic enzymes seems to indicate their active involvement in cellulose hydrolysis. In a recent report, polysaccharide monooxygenase genes have been reported from litter metatranscriptomes, and their involvement in litter decomposition thus seems likely. (C) 2012 Elsevier Ltd and The British Mycological Society. All rights reserved.
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