Mineralization of aromatic compounds by brown-rot basidiomycetes-mechanisms involved in initial attack on the aromatic ring

Fumika Kamada, Suzuna Abe, Nobuhiro Hiratsuka, Hiroyuki Wariishi, Hiroo Tanaka

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Benzaldehyde and its metabolic intermediates were effectively degraded by the brown-rot basidiomycetes Tyromyces palustris and Gloeophyllum trabeum. The pathway of benzaldehyde degradation was elucidated by the identification of fungal metabolites produced upon the addition of benzaldehyde and its metabolic intermediates. The oxidation and reduction occurred simultaneously, forming benzyl alcohol and benzoic acid as major products. Hydroxylation reactions, which seemed to be a key step, occurred on benzaldehyde and benzoic acid, but not on benzyl alcohol, to form corresponding 4-hydroxyl and 3,4-dihydroxyl derivatives. 1-Formyl derivatives were oxidized to 1-carboxyl derivatives at several metabolic stages. All of these reactions resulted in the formation of 3,4-dihydroxybenzoic acid. This was further metabolized via the decarboxylation reaction to yield 1,2,4-trihydroxybenzene, which may be susceptible to the ring-fission reaction. Ring-U14C-labelled benzaldehyde and benzoic acid were effectively mineralized, clearly indicating that the brown-rot basidiomycetes are capable of metabolizing certain aromatic compounds to CO2 and H2O, despite the fact that brown-rot fungi cannot degrade polymeric lignin. Inhibitor experiments, using hydroxyl radical scavengers, catalase and cytochrome P450 inhibitors, strongly suggested that the aromatic hydroxylation reactions found in the brown-rot fungi are catalysed by intracellular enzyme(s), but not by Fenton-reaction-derived hydroxyl radicals.

Original languageEnglish
Pages (from-to)1939-1946
Number of pages8
JournalMicrobiology
Volume148
Issue number6
Publication statusPublished - 2002

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Basidiomycota
Benzoic Acid
Hydroxyl Radical
Benzyl Alcohol
Hydroxylation
Fungi
Decarboxylation
Lignin
Catalase
Cytochrome P-450 Enzyme System
Oxidation-Reduction
benzaldehyde
Enzymes

All Science Journal Classification (ASJC) codes

  • Microbiology

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Mineralization of aromatic compounds by brown-rot basidiomycetes-mechanisms involved in initial attack on the aromatic ring. / Kamada, Fumika; Abe, Suzuna; Hiratsuka, Nobuhiro; Wariishi, Hiroyuki; Tanaka, Hiroo.

In: Microbiology, Vol. 148, No. 6, 2002, p. 1939-1946.

Research output: Contribution to journalArticle

Kamada, Fumika ; Abe, Suzuna ; Hiratsuka, Nobuhiro ; Wariishi, Hiroyuki ; Tanaka, Hiroo. / Mineralization of aromatic compounds by brown-rot basidiomycetes-mechanisms involved in initial attack on the aromatic ring. In: Microbiology. 2002 ; Vol. 148, No. 6. pp. 1939-1946.
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