Studies on compound I formation of the lignin peroxidase from Phanerochaete chrysosporium.

A. Andrawis, K. A. Johnson, Ming Tien

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Abstract

Ligninase, isolated from the wood-destroying fungus Phanerochaete chrysosporium, catalyzes the oxidation of lignin and lignin-related compounds. Ligninase reacts with H2O2 to form the classical peroxidase intermediates Compounds I and II. We have determined the activation energy of ligninase Compound I formation to be 5.9 kcal/mol. The effect of pH and ionic strength on the rate of ligninase Compound I formation was studied. In contrast to all other peroxidases, no pH effect was observed. This is despite homology of active-site amino acids residues (Tien, M., and Tu, C.-P. D. (1987) Nature 326, 520-523) which are proposed to affect the pH profile of Compound I formation. Ligninase Compound I formation can also be supported by organic peroxides. The second-order rate constants with the organic peroxides are lower, suggesting that H2O2 is the preferred substrate.

Original languageEnglish (US)
Pages (from-to)1195-1198
Number of pages4
JournalThe Journal of biological chemistry
Volume263
Issue number3
StatePublished - Jan 1 1988

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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