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Novel enzymatic activity of cell free extract from thermophilic Geobacillus sp. UZO 3 catalyzes reductive cleavage of diaryl ether bonds of 2,7-dichlorodibenzo-p-dioxin |
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| Authors: | Suzuki Yuzoh Nakamura Masaya Otsuka Yuichiro Suzuki Nao Ohyama Keisuke Kawakami Takeshi Sato Kanna Kajita Shinya Hishiyama Shojiro Fujii Takeo Takahashi Atsushi Katayama Yoshihiro |
| Institution: | a Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture & Technology, Koganei, Tokyo 184-8588, Japan b Forestry and Forest Products Research Institute, Tsukuba, Ibaraki 305-8687, Japan c Takasago Thermal Engineering Co. Ltd., Atsugi, Kanagawa 243-0213, Japan d College of Bioresource Sciences, Nihon University, Fujisawa, Kanagawa 252-0880, Japan |
| Abstract: | We characterized the ability of the cell free extract from polychlorinated dibenzo-p-dioxins degrading bacterium Geobacillus sp. UZO 3 to reduce even highly chlorinated dibenzo-p-dioxins such as octachlorodibenzo-p-dioxins in incineration fly ash. The degradation of 2,7-dichlorodibenzo-p-dioxin (2,7-DCDD) as a model dioxin catalyzed by the cell free extract from this strain implicates that the ether bonds of 2,7-DCDD molecule undergo reductive cleavage, since 4′,5-dichloro-2-hydroxydiphenyl ether and 4-chlorophenol were detected as intermediate products of 2,7-DCDD degradation. |
| Keywords: | Dioxin Microbial degradation Reductive cleavage Diaryl ether bonds Thermophilic bacterium Geobacillus sp UZO 3 |
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