title: Fungal bioconversion of toxic polychlorinated biphenyls by white-rot fungus, Phlebia brevispora.
abstract: Toxic coplanar polychlorinated biphenyls (Co-PCBs) were used as substrates for a degradation experiment with white-rot fungus, Phlebia brevispora TMIC33929, which is capable of degrading polychlorinated dibenzo-p-dioxins. Eleven PCB congener mixtures (7 mono-ortho- and 4 non-ortho-PCBs) were added to the cultures of P. brevispora and monitored by high resolution gas chromatography and mass spectrometry (HRGC/HRMS). Five PCB congeners, 3,3',4,4'-tetrachlorobiphenyl, 2,3,3',4,4'-pentachlorobiphenyl, 2,3',4,4',5-pentachlorobiphenyl, 3,3',4,4',5-pentachlorobiphenyl, and 2,3',4,4',5,5'-hexachlorobiphenyl were degraded by P. brevispora. To investigate the fungal metabolism of PCB, each Co-PCB was treated separately by P. brevispora and the metabolites were analyzed by gas chromatography and mass spectrometry (GC/MS) and identified on the basis of the GC/MS comparison with the authentic compound. Meta-methoxylated metabolite was detected from the culture containing each compound. Additionally, para-dechlorinated and -methoxylated metabolite was also detected from the culture with 2,3,3',4,4'-pentachlorobiphenyl, 2,3',4,4',5-pentachlorobiphenyl, and 2,3',4,4',5,5'-hexachlorobiphenyl, which are mono-ortho-PCBs. In this paper, we identified the congener specific degradation of coplanar PCBs by P. brevispora, and clearly proved for the first time by identifying the metabolites that the white-rot fungus, P. brevispora, transformed recalcitrant coplanar PCBs.
authors.affiliation: Department of Forest and Forest Products Sciences, Faculty of Agriculture, Kyushu University, 6-10-1 Hakozaki, 812-8581 Higashi-ku, Fukuoka, Japan.
authors.forename: Ichiro
authors.initials: I
authors.lastname: Kamei
authors.forename: Shigenori
authors.initials: S
authors.lastname: Sonoki
authors.forename: Koichi
authors.initials: K
authors.lastname: Haraguchi
authors.forename: Ryuichiro
authors.initials: R
authors.lastname: Kondo
mesh_terms: D001673:Biodegradation, Environmental; D008401:Gas Chromatography-Mass Spectrometry; D015394:Molecular Structure; D011078:Polychlorinated Biphenyls / Q000378:metabolism*; D020072:Polyporales / Q000378:metabolism*
chemical_list: D011078:Polychlorinated Biphenyls