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Significance Microbes in contaminated environments often evolve new metabolic pathways for detoxification or degradation of pollutants. In some cases, intermediates in newly evolving pathways are more toxic than the initial compound. The initial step in the degradation of pentachlorophenol bySphingobium chlorophenolicum generates a particularly toxic intermediate, tetrachlorobenzoquinone (TCBQ). This paper describes how the bacterium is protected from the toxic effects of TCBQ. In the presence of tetrachlorobenzoquinone reductase, TCBQ produced by pentachlorophenol hydroxylase is sequestered until it is reduced to the less toxic tetrachlorohydroquinone.

Sequestration of a highly reactive intermediate in an evolving pathway for degradation of pentachlorophenol