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. 1993 Jun;59(6):1919–1926. doi: 10.1128/aem.59.6.1919-1926.1993

Overproduction of lignin peroxidase by Phanerochaete chrysosporium (BKM-F-1767) under nonlimiting nutrient conditions.

C G Dosoretz 1, N Rothschild 1, Y Hadar 1
PMCID: PMC182181  PMID: 8328807

Abstract

The ligninolytic enzymes synthesized by Phanerochaete chrysosporium BKM-F-1767 immobilized on polyurethane foam were characterized under limiting, sufficient, and excess nutrient conditions. The fungus was grown in a nonimmersed liquid culture system under conditions close to those occurring in nature, with nitrogen concentrations ranging from 2.4 to 60 mM. This nonimmersed liquid culture system consisted of fungal mycelium immobilized on porous pieces of polyurethane foam saturated with liquid medium and highly exposed to gaseous oxygen. Lignin peroxidase (LIP) activity decreased to almost undetectable levels as the initial NH4+ levels were increased over the range from 2.4 to 14 mM and then increased with additional increases in initial NH4+ concentration. At 45 mM NH4+, LIP was overproduced, reaching levels of 800 U/liter. In addition, almost simultaneous secretion of LIP and secretion of manganese-dependent lignin peroxidase were observed on the third day of incubation. Manganese-dependent lignin peroxidase activity was maximal under nitrogen limitation conditions (2.4 mM NH4+) and then decreased to 40 to 50% of the maximal level in the presence of sufficient or excess initial NH4+ concentrations. Overproduction of LIP in the presence of a sufficient nitrogen level (24 mM NH4+) and excess nitrogen levels (45 to 60 mM NH4+) seemed to occur as a response to carbon starvation after rapid glucose depletion. The NH4+ in the extracellular fluid reappeared as soon as glucose was depleted, and an almost complete loss of CO2 was observed, suggesting that an alternative energy source was generated by self-proteolysis of cell proteins.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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