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Identification of naphthalene metabolism by white rot fungus Armillaria sp.F022

Journal of Environmental Sciences 2012年第4期24卷 728-732页

作者： Tony Hadibarata Abdull Rahim Mohd Yusoff azmi aris Risky Ayu Kristanti Institute of Environmental and Water Resources Management Universiti Teknologi Malaysia81310 SkudaiJohorMalaysia Department of Chemical and Environmental Engineering.Yamanashi University 4-4-37 TakedaKofuYamanashi400-8510 Japan

Armillaria sp. F022, a white rot fungus isolated from tropical rain forest （Samarinda, Indonesia） was used to biodegrade naphthalene in cultured medium. Transformation of naphthalene by Armillaria sp. F022 which is able to use naphthalene, a two ring-polycyclic aromatic hydrocarbon （PAH） as a source of carbon and energy was investigated. The metabolic pathway was elucidated by identifying metabolites, biotransformation studies and monitoring enzyme activities in cell-free extracts. The identification of metabolites suggests that Armillaria sp. F022 initiates its attack on naphthalene by dioxygenation at its C-1 and C-4 positions to give 1,4-naphthoquinone. The intermediate 2-hydroxybenzaldebyde and salicylic acid, and the characteristic of the meta-cleavage of the resulting diol were identified in the long-term incubation. A part from typical metabolites of naphthalene degradation known from mesophiles, benzoic acid was identified as the next intermediate for the naphthalene pathway of this Armillaria sp. F022. Neither phthalic acid, catechol and cis, cis-muconic acid metabolites were detected in culture extracts. Several enzymes （manganese peroxidase, lignin peroxidase, laccase, 1,2-dioxygenase and 2,3-dioxygenase） produced by ArmiUaria sp. F022 were detected during the incubation.

关键词： Armillaria sp. F022 dioxygenase enzymes ligninolytic enzymes naphthalene metabolites 1,4-naphthaquinone

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