title: Identification of metabolites from benzo[a]pyrene oxidation by ligninolytic enzymes of Polyporus sp. S133.
abstract: The biodegradation of benzo[a]pyrene (BaP) by using Polyporus sp. S133, a white-rot fungus isolated from oil-contaminated soil was investigated. Approximately 73% of the initial concentration of BaP was degraded within 30 d of incubation. The isolation and characterization of 3 metabolites by thin layer chromatography, column chromatography, and UV-vis spectrophotometry in combination with gas chromatography-mass spectrometry, indicated that Polyporus sp. S133 transformed BaP to BaP-1,6-quinone. This quinone was further degraded in 2 ways. First, BaP-1,6-quinone was decarboxylated and oxidized to form coumarin, which was then hydroxylated to hydroxycoumarin, and finally to hydroxyphenyl acetic acid by addition of an epoxide group. Second, Polyporus sp. S133 converted BaP-1,6-quinone into a major product, 1-hydroxy-2-naphthoic acid. During degradation, free extracellular laccase was detected with reduced activity of lignin peroxidase, manganese-dependent peroxidase and 2,3-dioxygenase, suggesting that laccase and 1,2-dioxygenase might play an important role in the transformation of PAHs compounds.
authors: Institute of Environmental and Water Resources Management, Faculty of Civil Engineering, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor Bahru, Malaysia. hadibarata@utm.my
authors: Tony
authors: T
authors: Hadibarata
authors: Risky Ayu
authors: RA
authors: Kristanti
mesh_terms: D001564:Benzo(a)pyrene / Q000378:metabolism*; D001580:Benzopyrenes / Q000378:metabolism*; D001673:Biodegradation, Environmental; D002855:Chromatography, Thin Layer; D004785:Environmental Pollutants / Q000378:metabolism*; D008401:Gas Chromatography-Mass Spectrometry; D006358:Hot Temperature; D009284:Naphthols / Q000378:metabolism*; D055492:Polyporus / Q000201:enzymology / Q000378:metabolism*; D013056:Spectrophotometry, Ultraviolet
chemical_list: D001580:Benzopyrenes; D004785:Environmental Pollutants; D009284:Naphthols; C030233:benzo(a)pyrene-1,6-quinone; D001564:Benzo(a)pyrene; C050175:1-hydroxy-2-naphthoic acid