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Appl. Environ. Microbiol., Feb 1996, 367-371, Vol 62, No. 2
Copyright © 1996, American Society for Microbiology

Degradation of Chlorinated Dibenzofurans and Dibenzo-p-Dioxins by Sphingomonas sp. Strain RW1

H Wilkes, R Wittich, KN Timmis, P Fortnagel and W Francke
Institut fur Organische Chemie and Institut fur Allgemeine Botanik, Abteilung Mikrobiologie, Universitat Hamburg, and Division of Microbiology, GBF--National Research Centre for Biotechnology, D-38124 Braunschweig, Germany

The ability of the dibenzofuran- and dibenzo-p-dioxin-mineralizing bacterium Sphingomonas sp. strain RW1 (R.-M. Wittich, H. Wilkes, V. Sinnwell, W. Francke, and P. Fortnagel, Appl. Environ. Microbiol. 58:1005-1010, 1992) to oxidize chlorinated derivatives of dibenzofuran and dibenzo-p-dioxin was analyzed. Strain RW1 degraded several mono- and dichlorinated dibenzofurans and dibenzo-p-dioxins, but it did not degrade more highly chlorinated congeners. Most mono- and dichlorinated dibenzofurans and dibenzo-p-dioxins investigated in this study were degraded to the corresponding mono- and dichlorinated salicylates and catechols, respectively, together with salicylate and catechol. This indicates an initial dioxygenolytic attack on the substituted as well as on the nonsubstituted aromatic nucleus of most of the target compounds. Strain RW1 could not grow at the expense of monochlorinated dibenzo-p-dioxins and dibenzofurans as carbon sources, with the exception of 4-chlorodibenzofuran, which was stoichiometrically converted to 3-chlorosalicylate.


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