By Walter Reineke (auth.), B. Beek (eds.)
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Extra info for Biodegradation and Persistance
When no lignin and manganese peroxidases are produced. P. ostreatus differs from P. chrysosporium in its lignin degradation mechanism in that it does not involve lignin peroxidase activity . Instead, its lignin degradation ability is assumed to be due to laccase activity [127, 128, 131, 170]. Laccase was found to be nonspecific as to its reducing substrate as well as able to oxidize a variety of substrates including polyphenols, methoxy-substituted phenols, diamines, and a range of other compounds.
1 Degradation by Non-Ligninolytic Fungi A variety of fungi have been found to transform aromatic compounds including complex polycyclic aromatic hydrocarbons to metabolites that are similar to those produced by mammalian enzymes. Only a few fungi appear to have the ability to catabolize PAHs to CO2 . In Cunninghamella elegans, a non-ligninolytic fungus, and several other fungi naphthalene is metabolized via a branched pathway to naphthalene trans1,2-dihydrodiol, 1-naphthol, 2-naphthol, 4-hydroxy-1-tetralone, 1,4-naphtho- Aerobic and Anaerobic Biodegradation Potentials of Microorganisms 33 quinone, and 1,2-naphthoquinone (Fig.
21. Proposed pathway for the fungal oxidation of naphthalene. ቢ cytochrome P-450 monooxygenase, ባ epoxide hydrolase 34 W. Reineke Fig. 22. Proposed pathway for the fungal oxidation of anthracene. ቢ cytochrome P-450 monooxygenase, ባ epoxide hydrolase positions may also be oxidized to form trans-3,4-dihydrodiol and trans-9,10dihydrodiol. 1 The Ligninolytic System White rot fungi have the ability to degrade lignin efficiently [125–128]. This capacity results from the activities of a complex system (Fig.
Biodegradation and Persistance by Walter Reineke (auth.), B. Beek (eds.)