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METABOLISM OF DIBENZO-P-DIOXIN AND CHLORINATED DIBENZO-P-DIOXINS BY A BEIJERINCKIA SPECIES
Citation:
Klecka, G. AND D. Gibson. METABOLISM OF DIBENZO-P-DIOXIN AND CHLORINATED DIBENZO-P-DIOXINS BY A BEIJERINCKIA SPECIES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-80/131.
Description:
Whole cells of the parent strain of Beijerinckia, grown with succinate and biphenyl, oxidized dibenzo-p-dioxin and several chlorinated dioxins. The rate of oxidation of the chlorinated dibenzo-p-dioxons decreased with an increasing degree of chlorine substitution. A mutant strain (B8/36) of Beijerinckia oxidized dibenzo-p-dioxin to cis-1,2-dihydroxy-1,2-dihydrodibenzo-p-dioxin. The mutant organism also oxidized two monochlorinated dibenzo-p-dioxins to cis-dihydrodiols. No metabolites were detected from two dichlorinated dibenzo-p-dioxins. Growth of the parent strain of Beijerinckia was inhibited after 4 hr when 0.05% dibenzo-p-dioxin was present in the culture medium. Resting cell suspensions of the parent organism, previously grown with succinate and biphenyl, oxidized dibenzo-p-dioxin to a compound identified as 1,2-dihydroxydibenzo-p-dioxin. Further degradation of this metabolite was not detected, as the compound was found to be a potent mixed-type inhibitor of two ring-fission oxygenases present in this organism.