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J Basic Microbiol. 2000;40(4):243-9.

Degradation of 2,4,6-trichlorophenol via chlorohydroxyquinol in Ralstonia eutropha JMP134 and JMP222.

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Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Alameda, Santiago, Chile.


The aim of this work was to study the catabolic pathway of the pollutant 2,4,6-trichlorophenol in Ralstonia eutropha JMP134. 2,6-dichlorohydroquinone was detected as transient intermediate. Enzymatic transformations of 6-chlorohydroxyquinol to 2-chloromaleylacetate, and of this compound to maleylacetate were detected in crude extracts. Therefore, the degradation of 2,4,6-trichlorophenol proceeded through an hydroxyquinol pathway, different from the other chloroaromatic pathways reported in this strain. The same results were observed in two other 2,4,6-trichlorophenol degrading strains: R. eutropha JMP222, a derivative of strain JMP134 lacking the chlorocatechol catabolism-encoding pJP4 plasmid, and a river isolate, Ralstonia sp. PZK.

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