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Title: Analysis of D-glucose metabolism of wood decay fungi using 13C-NMR and 13C-labeled substrates

Author: de Koker, Theodorus H.; Mozuch, Michael D.; Kersten, Philip J.

Date: 2003

Source: Thirty-fourth annual meeting of the International Research Group on Wood Preservation : 2003 May 18-23, Brisbane, Queensland, Australia. Stockholm, Sweden : IRG Secretariat, 2003: 9 pages.

Publication Series: Miscellaneous Publication

Description: D-Glucose metabolism is thought to be important during wood decay by fungi, not only for anabolic and catabolic purposes of central metabolism, but also as a potential source of peroxide required by extracellular peroxidases. There has been some confusion in the literature as to whether this peroxide-generating activity is of the glucose 1-oxidase or pyranose 2-oxidase (glucose 2-oxidase) type with various fungi or even within the same fungal species. Definitive classification requires accurate identification of the enzymatic products D-glucono- 1,5-lactone and D- arabino-2-hexosulose (glucosone) with glucose 1-oxidase and pyranose 2- oxidase, respectively. We used 13C-NMR to distinguish these reactions starting with 13C-labeled glucose. The use of labeled substrates simplifies analysis and greatly increases detection sensitivity without requiring the isolation or derivatization of metabolites. We synthesized 13C-1-glucosone to study subsequent metabolism with crude enzyme preparations. Preliminary results with Phanerochaete chrysosporium are presented.

Keywords: Phanerochaete chrysosporium, glucose 1-oxidase, pyranose 2-oxidase, D-glucono-1, 5-lactone, glucosone, pyranosone dehydratase, wood-decaying fungi, peroxidase, microbial metabolism, microbial metabolites, carbon, fungal physiology, nuclear magnetic resonance, enzymes, Phanerochaete chrysosporium

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de Koker, Theodorus H.; Mozuch, Michael D.; Kersten, Philip J. 2003. Analysis of D-glucose metabolism of wood decay fungi using 13C-NMR and 13C-labeled substrates. Thirty-fourth annual meeting of the International Research Group on Wood Preservation : 2003 May 18-23, Brisbane, Queensland, Australia. Stockholm, Sweden : IRG Secretariat, 2003: 9 pages.

 


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