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. 1994 Feb;60(2):569–575. doi: 10.1128/aem.60.2.569-575.1994

Secretion of Ligninolytic Enzymes and Mineralization of 14C-Ring-Labelled Synthetic Lignin by Three Phlebia tremellosa Strains

Tamara Vares 1, Outi Niemenmaa 1, Annele Hatakka 1,*
PMCID: PMC201350  PMID: 16349186

Abstract

Production of ligninolytic enzymes by three strains of the white rot fungus Phlebia tremellosa (syn. Merulius tremellosus) was studied in bioreactor cultivation under nitrogen-limiting conditions. The Mn(II) concentration of the growth medium strongly affected the secretion patterns of lignin peroxidase and laccase. Two major lignin peroxidase isoenzymes were expressed in all strains. In addition, laccase and glyoxal oxidase were purified and characterized in one strain of P. tremellosa. In contrast, manganese peroxidase was not found in fast protein liquid chromatography profiles of extracellular proteins under either low (2.4 μM) or elevated (24 and 120 μM) Mn(II) concentrations. However, H2O2- and Mn-dependent phenol red-oxidizing activity was detected in cultures supplemented with higher Mn(II) levels. Mineralization rates of 14C-ring-labelled synthetic lignin (i.e., dehydrogenation polymerizate) by all strains under a low basal Mn(II) level were similar to those obtained for Phanerochaete chrysosporium and Phlebia radiata. A high manganese concentration repressed the evolution of 14CO2 even when a chelating agent, sodium malonate, was included in the medium.

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Selected References

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