Affiliation:
1. Department of Microbiology, The University of Texas at Austin, Austin, Texas 78712
Abstract
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
-dioxins 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
on succinate was inhibited after 4 h 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.
Publisher
American Society for Microbiology
Subject
Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology
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