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Catabolic characteristics of biphenyl-utilizing isolates which cometabolize PCBs

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Abstract

As there are at least three types of bacteria involved in the aerobic mineralization of polychlorinated biphenyls (PCBs), this study was undertaken to determine what catabolic features are lacking in biphenyl-degraders and to determine if chlorobenzoate- and chloroacetate-utilizing bacteria are as indigenous to soil as biphenyl-degraders. Bacteria were tested for their ability to utilize chlorinated acids and to cometabolize Aroclor 1254 and dibenzo-p-dioxane (dioxin). The broad and variable substrate specificity of the biphenyl dioxygenase among strains was noted by the range of <1 to 53% cometabolism of total PCB congeners and by the oxidation of dioxin, which was not a growth substrate. Growth on chloroalkanoic acids was more frequent with 2-chloropropionate (87% of all strains), 3-chloropropionate (72%), 4-chlorobutyrate (66%), and less frequent (28%) withtrans-3-chlorocrotonate. However, only one strain,Pseudomonas fluorescens K3, could utilize chloroacetate. No biphenyl-utilizers grew on 2- or 4-chlorobenzoate, and only five strains grew on 3-chlorobenzoate. Acetate and benzoate-utilizers were found in all three soils tested at levels near 106/g, whereas chloroacetate- or chlorobenzoate-utilizers were not detected. The inability of biphenyl-degraders to dehalogenate the products of PCB cometabolism is clearly unrelated to metabolism of saturated chloroaliphatic acids, with the notable exception of chloroacetate, since most strains grew on them. Thus, the inability to utilize chloroacetate, a central intermediate in the meta fission pathway, may be relevant to the incomplete catabolism of PCBs by biphenyl-utilizers.

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Authors and Affiliations

  1. Departamento de Microbiología, Universidad de Panamá, Panamá

    Blanca S. Hernandez

  2. Department of Soil & Environmental Sciences, University of California, 92521, Riverside, CA, USA

    Joseph J. Arensdorf & Dennis D. Focht

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  1. Blanca S. Hernandez
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  2. Joseph J. Arensdorf
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  3. Dennis D. Focht
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Hernandez, B.S., Arensdorf, J.J. & Focht, D.D. Catabolic characteristics of biphenyl-utilizing isolates which cometabolize PCBs. Biodegradation 6, 75–82 (1995). https://doi.org/10.1007/BF00702302

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