Abstract
One-step conversion of aniline, phenol and some of their monochlorinated derivatives into the corresponding catechols by resting pre-adapted cells of the Rhodococcus mutant strain AM 144 (defective in synthesis of catechol 1,2-dioxygenase) was shown to depend on the availability of an additional metabolizable carbon substrate, e.g. glucose or acetate. A stoichiometric relation existed between the amount of the latter compounds added and the amount of aniline (or phenol, respectively) converted into catechol suggesting that the primary function of the cosubstrates was to provide reducing power to the oxygenative transformation reaction. The observed cosubstrate-dependence generally parallels that seen in previous studies on turnover of different monochloroaromatic non-growth substrates by aromatics-utilizing Rhodococcus wildtype-strains. Cell cultures of strain AM 144 growing at the expense of acetate also proved able to convert aniline into catechol. Typically, growth of the cells was retarded during the phase of aniline transformation as compared to the respective control cultures. Based on the results of these model experiments, it was concluded that (i) in natural microbial communities cometabolically active bacteria would hardly enrich under cometabolic conditions over fast-growing non-cometabolizing bacteria if the latter organisms will tolerate the particular non-growth substrate, and (ii) cometabolizing bacteria would have a selective advantage only if the non-growth substrate to be transformed is a toxic one or if it can serve as a potential nutrient source (e.g., of nitrogen or sulfur).
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Abbreviations
- MCA:
-
monochloroaniline
- MCP:
-
monochlorophenol
- MCC:
-
monochlorocatechol
- TLC:
-
thin-layer chromatography
- MS:
-
mass spectrometry
- GLC:
-
gas-liquid chromatography
- UV:
-
ultraviolet (range of the spectrum)
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Janke, D., Ihn, W. Cometabolic turnover of aniline, phenol and some of their monochlorinated derivatives by the Rhodococcus mutant strain AM 144. Arch. Microbiol. 152, 347–352 (1989). https://doi.org/10.1007/BF00425172
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DOI: https://doi.org/10.1007/BF00425172