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Nitrogen-deregulated mutants of Phanerochaete chrysosporium —a lignin-degrading basidiomycete

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Abstract

Two nitrogen-deregulated mutants of Phanerochaete chrysosporium, der8-2 and der8-5, were isolated by subjecting wild type conidia to gamma irradiation, plating on Poly-R medium containing high levels of nitrogen, and identifying colonies that are able to decolorize Poly-R. The mutants showed high levels of ligninolytic activity (14C-synthetic lignin → 14CO2), and lignin peroxidase, manganese peroxidase and glucose oxidase activities in both low nitrogen (2.4 mM) and high nitrogen (24 mM) media. The wild type on the otherhand displayed these activities in low nitrogen medium but showed little or no activities in high nitrogen medium. Fast protein liquid chromatographic analyses showed that the wild type as well as the der mutants produce three major lignin peroxidase peaks (designated L1, L2 and L3) with lignin peroxidase activity in low nitrogen medium. Furthermore, in low nitrogen medium, mutant der8-5 produced up to fourfold greater lignin peroxidase activity than that produced by the wild type. In high nitrogen medium, the wild type produced no detectable lignin peroxidase peaks whereas the mutants produced peaks L1 and L2, but not L3, and a new lignin peroxidase protein peak designated LN. Mutants der8-2 and der8-5 also produced high levels of glucose oxidase, an enzyme known to be associated with secondary metabolism and an important source of H2O2 in ligninolytic cultures, both in low and high nitrogen media. In contrast, the wild type produced high levels of glucose oxidase in low nitrogen medium and only trace amounts of this enzyme in high nitrogen medium. The results of this study indicate that the der mutants are nitrogen-deregulated for the production of a set of secondary metabolic activities associated with lignin degradation such as lignin peroxidases, manganese peroxidases and glucose oxidase.

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Authors and Affiliations

  1. Department of Microbiology and Public Health, Michigan State University, 48824-1101, East Lansing, MI, USA

    K. Boominathan, S. Balachandra Dass, T. A. Randall & C. A. Reddy

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  1. K. Boominathan
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  2. S. Balachandra Dass
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  3. T. A. Randall
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  4. C. A. Reddy
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Boominathan, K., Dass, S.B., Randall, T.A. et al. Nitrogen-deregulated mutants of Phanerochaete chrysosporium —a lignin-degrading basidiomycete. Arch. Microbiol. 153, 521–527 (1990). https://doi.org/10.1007/BF00245259

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  • DOI: https://doi.org/10.1007/BF00245259

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