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. 1993 Sep;59(9):2909–2913. doi: 10.1128/aem.59.9.2909-2913.1993

Lignin and veratryl alcohol are not inducers of the ligninolytic system of Phanerochaete chrysosporium.

A M Cancel 1, A B Orth 1, M Tien 1
PMCID: PMC182385  PMID: 8215363

Abstract

Phanerochaete chrysosporium is a white rot fungus which secretes a family of lignin-degrading enzymes under nutrient limitation. In this work, we investigated the roles of veratryl alcohol and lignin in the ligninolytic system of P. chrysosporium BKM-F-1767 cultures grown under nitrogen-limited conditions. Cultures supplemented with 0.4 to 2 mM veratryl alcohol showed increased lignin peroxidase activity. Addition of veratryl alcohol had no effect on Mn-dependent peroxidase activity and inhibited glyoxal oxidase activity. Azure-casein analysis of acidic proteases in the extracellular fluid showed that protease activity decreased during the early stages of secondary metabolism while lignin peroxidase activity was at its peak, suggesting that proteolysis was not involved in the regulation of lignin peroxidase activity during early secondary metabolism. In cultures supplemented with lignin or veratryl alcohol, no induction of mRNA coding for lignin peroxidase H2 or H8 was observed. Veratryl alcohol protected lignin peroxidase isozymes H2 and H8 from inactivation by H2O2. We conclude that veratryl alcohol acts as a stabilizer of lignin peroxidase activity and not as an inducer of lignin peroxidase synthesis.

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Selected References

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