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Title: Pathways for Extracellular Fenton Chemistry in the Brown Rot Basidiomycete Gloeophyllum Trabeum

Source: APPLIED AND ENVIRONMENTAL MICROBIOLOGY, June 2001, Vol. 67, No. 6; p. 2705-2711

Author(s)Jensen, Houtman, Ryan, Hammel

Publication Year: 2001  View PDF »

Category: Journal Articles

Abstract: The brown rot fungus Gloeophyllum trabeum uses an extracellular hydroquinone-quinone redox cycle to reduce Fe3+ and produce H2O2. 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 Fe3+ in G. trabeum cultures, the 2,5-DMHQ-dependent reaction reduced O2 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. 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.

File size: 279 kb(s)

Date posted: 10/20/2009
RITS Product ID: 89323
Current FPL Scientists associated with this product (listed alphabetically)
Hammel, Kenneth E.
Research Chemist
Houtman, Carl J.
Chemical Engineer
 

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