Mineralization of synthetic humic substances by manganese peroxidase from the white-rot fungus Nematoloma frowardii |
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| Authors: | M Hofrichter K Scheibner I Schneegaß D Ziegenhagen W Fritsche |
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| Institution: | Friedrich-Schiller-Universit?t Jena, Institut für Mikrobiologie, Lehrstuhl Technische Mikrobiologie, Philosophenweg 12, D-07743 Jena, Germany Tel.: +49 3641 630950 Fax: +49 3641 631237 e-mail: hofrichter@merlin.biologie.uni-jena.de, DE
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| Abstract: | A manganese peroxidase preparation from the white-rot fungus Nematoloma frowardii was found to be capable of releasing up to 17% 14CO2 from 14C-labelled synthetic humic substances. The latter were prepared from U-14C]catechol by spontaneous oxidative polymerization or laccase-catalysed polymerization. The ex-tent of humic substance mineralization
was considerably enhanced in the presence of the thiol mediator glutathione (up to 50%). Besides the evolution of 14CO2, the treatment of humic substances with Mn peroxidase resulted in the formation of lower-molecular-mass products. Analysis
of residual radioactivity by gel-permeation chromatography demonstrated that the predominant molecular masses of the initial
humic substances ranged between 2 kDa and 6 kDa; after treatment with Mn peroxidase, they were reduced to 0.5–2 kDa. The extracellular
depolymerization and mineralization of humic substances by the Mn peroxidase system may play an important role in humus turnover
of habitats that are rich in basidiomycetous fungi.
Received: 25 September 1997 / Received revision: 12 January 1998 / Accepted: 13 January 1998 |
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