1. Academic Validation
  2. Pathways for extracellular Fenton chemistry in the brown rot basidiomycete Gloeophyllum trabeum

Pathways for extracellular Fenton chemistry in the brown rot basidiomycete Gloeophyllum trabeum

  • Appl Environ Microbiol. 2001 Jun;67(6):2705-11. doi: 10.1128/AEM.67.6.2705-2711.2001.
K A Jensen Jr 1 C J Houtman Z C Ryan K E Hammel
Affiliations

Affiliation

  • 1 Institute for Microbial and Biochemical Technology, U.S. Department of Agriculture Forest Products Laboratory, Madison, Wisconsin 53705, USA.
Abstract

The brown rot fungus Gloeophyllum trabeum uses an extracellular hydroquinone-quinone redox cycle to reduce Fe(3+) and produce H(2)O(2). These reactions generate extracellular Fenton reagent, which enables G. trabeum to degrade a wide variety of organic compounds. We found that G. trabeum secreted two Quinones, 2,5-dimethoxy-1,4-benzoquinone (2,5-DMBQ) and 4,5-dimethoxy-1,2-benzoquinone (4,5-DMBQ), that underwent iron-dependent redox cycling. Experiments that monitored the iron- and quinone-dependent cleavage of polyethylene glycol by G. trabeum showed that 2,5-DMBQ was more effective than 4,5-DMBQ in supporting extracellular Fenton chemistry. Two factors contributed to this result. First, G. trabeum reduced 2,5-DMBQ to 2,5-dimethoxyhydroquinone (2,5-DMHQ) much more rapidly than it reduced 4,5-DMBQ to 4,5-dimethoxycatechol (4,5-DMC). Second, although both hydroquinones reduced ferric oxalate complexes, the predominant form of Fe(3+) in G. trabeum cultures, the 2,5-DMHQ-dependent reaction reduced O(2) more rapidly than the 4,5-DMC-dependent reaction. Nevertheless, both hydroquinones probably contribute to the extracellular Fenton chemistry of G. trabeum, because 2,5-DMHQ by itself is an efficient reductant of 4,5-DMBQ.

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