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. 1995 May;61(5):1833–1838. doi: 10.1128/aem.61.5.1833-1838.1995

Ligninolytic System Formation by Phanerochaete chrysosporium in Air

N Rothschild, Y Hadar, C Dosoretz
PMCID: PMC1388442  PMID: 16535024

Abstract

This study characterizes the effect of oxygen concentration on the synthesis of ligninolytic enzymes by Phanerochaete chrysosporium immobilized on polyurethane foam cubes in a nonimmersed liquid culture system and maintained under different carbon-to-nitrogen (C/N) ratios and levels. Lignin peroxidase (LIP) activity was obtained in cultures exposed to air when the C/N ratio was low (7.47), i.e., when nitrogen levels were high (C/N = 56/45 mM) or carbon levels were low (C/N = 5.6/4.5 mM). At the low C/N ratio, the fungus was carbon starved and did not produce extracellular polysaccharides. At a high C/N ratio (153), i.e., under conditions of excess carbon (nitrogen limitation) (C/N = 56/2.2 mM), cultures exposed to air produced large amounts of polysaccharide, and LIP activity was detected only in cultures exposed to pure oxygen. Under high-nitrogen conditions, LIP production was 1,800 U/liter in cultures exposed to pure oxygen and 1,300 U/liter in cultures exposed to air, with H1 and H2 being the main isoenzymes. The oxygen level did not significantly alter the isoenzyme profile, nor did low-carbon conditions. The formation of manganese peroxidase was generally less affected by the oxygen level than that of LIP but was considerably reduced by a low C/N ratio. The effects of oxygen level and C/N ratio on the synthesis of glyoxal oxidase paralleled their effects on LIP synthesis except in the case of high nitrogen, which totally suppressed glyoxal oxidase activity.

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Selected References

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