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The dnt pathway of Burkholderia sp. R34 is in the midst of an evolutionary journey from its ancestral, natural substrate (naphthalene) towards a new xenobiotic one [2,4-dinitrotoluene (DNT)]. The gene cluster encoding the leading multicomponent ring dioxygenase (DntA) has activity on the old and the new substrate, but it is induced by neither. Instead, the transcriptional factor encoded by the adjacent gene (dntR) activates expression of the dnt cluster upon addition of salicylate, one degradation intermediate of the ancestral naphthal
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