alexa Biotransformation of the organochlorine pesticide trans-chlordane by wood-rot fungi.
Chemical Engineering

Chemical Engineering

Journal of Bioprocessing & Biotechniques

Author(s): Xiao P, Mori T, Kondo R

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Abstract There is very limited information on the biotransformation of organochlorine pesticide chlordane by microorganisms, and no systematic study on the metabolic products and pathways for chlordane transformation by wood-rot fungi has been conducted. In this study, trans-chlordane was metabolized with the wood-rot fungi species Phlebia lindtneri, Phlebia brevispora and Phlebia aurea, which are capable of degrading polychlorinated dibenzo-p-dioxin and heptachlor epoxide. At the end of 42 days of incubation, over 50\% of trans-chlordane was degraded by the fungal treatments in pure cultures. These fungi transformed trans-chlordane to at least eleven metabolites including a large amount of hydroxylated products such as 3-hydroxychlordane, chlordene chlorohydrin, heptachlor diol, monohydroxychlordene and dihydroxychlordene. P. lindtneri particularly can metabolize oxychlordane, a recalcitrant epoxide product of chlordane, into a hydroxylated product through substitution of chlorine atom by hydroxyl group. The present results suggest that hydroxylation reactions play an important role in the metabolism of trans-chlordane by these Phlebia species. Additionally, transformation of trans-chlordane and production of hydroxylated metabolites were efficiently inhibited by the addition of cytochrome P450 inhibitors, piperonyl butoxide and 1-aminobenzotriazole, demonstrating that fungal cytochrome P450 enzymes are involved in some steps of trans-chlordane metabolism, particularly in the hydroxylation process. Copyright © 2011 Elsevier B.V. All rights reserved. This article was published in N Biotechnol and referenced in Journal of Bioprocessing & Biotechniques

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