Direct cleavage of the vicinal diol linkage of the lignin model compound dihydroanisoin by the basidiomycete Phanerochaete chrysosporium
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Phanerochaete
Chrysosporium
Cleavage (geology)
Bond cleavage
Decomposition of 14 C-labeled lignin to 14 CO 2 by the lignin-decomposing fungi Phanerochaete chrysosporium and Coriolus versicolor required a growth substrate such as cellulose or glucose. Growth with lignin as sole carbon addition to an otherwise complete medium was negligible.
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The extracellular fluid of ligninolytic cultures of the wood-decomposing basidiomycete Phanerochaete chrysosporium Burds. contains an enzyme that degrades lignin substructure model compounds as well as spruce and birch lignins. It has a molecular size of 42,000 daltons and requires hydrogen peroxide for activity.
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The three extracellular ligninolytic peroxidases from phanerochaete chrysosporium are lignin peroxidases, Mn-dependent peroxi-dases and gloxyal peroxidase. Phanerochaete chrysosporium's ability to degrade dye vvastewater has incomparable advantages over the customary methods. This paper offers a brief summary of the degradation mechanism of Phanerochaete chrysosporium and its industrial application.
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When Phanerochaete chrysosporium degrades [ 14 C] lignin-labelled aspen wood in static liquid culture, it releases almost as much 14 C in water-soluble form as in 14 CO 2 . Water-soluble ultraviolet-absorbing materials also accumulate in cultures that are degrading lignin. The water-soluble radioactive materials appear to be intermediates in lignin degradation, because they can be further metabolized to CO 2 and because the soluble materials labelled during [ 14 C] lignin degradation are distinct from the materials labelled during [ 14 C] glucose metabolism. These lignin degradation products can be fractionated by gel chromatography and are mostly acidic.
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