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Title: The Ligninase of Phanerochaete chrysosporium Generates Cation Radicals from Methoxybenzenes

Source: THE JOURNAL OF BIOLOGICAL CHEMISTRY, Vol. 260, No.5, Issue of March 10, pp. 2609-2612, 1985

Author(s)Karsten, Philip J.; Tien, Ming; Kayanararnan, B.; Kirk, T. Kent

Publication Year: 1985  View PDF »

Category: Journal Articles

Abstract: The hemoprotein ligninase of Phanerochaete chrysosporium catalyzes, in the presence of H2O2, a variety of seemingly different oxidations in lignin and lignin model compounds. Here we show that the enzyme also catalyzes the oxidation of various methoxybenzenes. ESR spectroscopy shows that the compounds are oxidized to aryl cation radicals. These decompose, evidently by H2O addition. Thus 1,4-dimethoxybenzene is converted to p-benzoquinone and methanol. We propose a unified mechanism, based on formation of aryl cation radicals, to explain the various reactions catalyzed by the ligninase.

Keywords: Phanerochaete chrysosporium, cation radicals, methoxybenzenes

File size: 500 kb(s)

Date posted: 05/19/2010
Current FPL Scientist associated with this product
Kersten, Philip J.
Research Microbiologist
  

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