Manganese deficiency can replace high oxygen levels needed for lignin peroxidase formation by Phanerochaete chrysosporium

Article Abstract:

Research was conducted to examine the hypothesis that manganese deficiency can replace high oxygen levels needed for lignin peroxidase (LIP) formation by Phanerochaete chrysosporium. Shallow stationary cultures developed in the presence of limited or excess N were used to study the combined effects of Mn and oxygen on lignin peroxidase activity and isozyme composition. Results indicate that the trigger for LIP formation normally provided by a high oxygen concentration can be replaced by Mn deficiency and that the substitution can be effective under both N-limited and N-excess conditions.

Oxygen, Manganese, Manganese (Metal), Peroxidase, Isoenzymes

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Xylanase activity of Phanerochaete chrysosporium

Article Abstract:

The xylanase enzyme system of Phanerochaete chrysosporium was elucidated. Enzyme assays showed that this fungus produces several active xylanases. Isoelectric focusing showed three isoenzyme groups with beta-xylanase, beta-xylosidase and arabinofuranosidase activities. Growth of the fungus on highly purified Avicel cellulose showed that at least part of thexylanase enzymes are expressed constitutively. However, such growth did not result in the accumulation of reducing sugars, although growth on xylan did result in such accumulation.

Analysis, Physiological aspects, Microbial enzymes, Wood-decaying fungi

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