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Metabolism of hydroxybiphenyl and chloro-hydroxybiphenyl by biphenyl/chlorobiphenyl degradingPseudomonas testosteroni,strain B-356
Authors:M Sondossi  M Sylvestre  D Ahmad  R Massé
Institution:(1) Institut National de la Recherche Scientifique, INRS-Santé, Université de Québec, 245 Hymus, H9R 1G6 Pointe-Claire, Québec, Canada
Abstract:Summary A biphenyl (BP) and chlorobiphenyl (CBP) metabolizingPseudomonas testosteroni, strain B-356 was also capable of utilizing 2-, 3-, and 4-hydroxybiphenyl. Data presented here suggest that utilization of biphenyl and mono-subtituted biphenyls involves the enzymes of the same pathway. Chloro-hydroxybiphenyls were also metabolized by strain B-356. The unsubstituted ring is first hydroxylated in position 2 and 3 and then cleaved in ameta 1, and 2, position to ultimately generate the benzoic acid derivatives. Since strain B-356 was capable of utilizing benzoic acid and mono-hydroxybenzoic acids, the utilization of biphenyl, 2-, 3-, and 4-hydroxybiphenyl is complete at non-toxic concentrations of the substrates. Chlorobenzoic acids and chloro-hydroxybenzoic acids were not metabolized further by this strain. Studies usingPseudomonas putida, strain KT2440 carrying cloned BP/CBP genes from strain B-356 provided further evidence for the presence of a common pathway for the metabolism of the above compounds inP. testosteroni, strain B-356. Suggestions are made on significance of the broad substrate specificity of the enzymes of biphenyl/chlorobiphenyl pathway in regard to their possible origin and in relation to PCB mixture degradation.
Keywords:PCB degradation  Common pathway  Biphenyl  Hydroxybiphenyl  Chloro-hydroxybiphenyl  Chlorobiphenyl  Pseudomonas testosteroni  Pseudomonas putida
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