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The isophthalate (IPA) catabolic operon (iphACBDR) of Comamonas sp. strain E6 responsible for the conversion of IPA into protocatechuate is negatively regulated by an IclR‐type transcriptional regulator, IphR. Promoter analysis showed that the region sufficient for the IPA‐dependent induction of the iphA promoter was located within the 87 bp region upstream from the iphA start codon. The transcription...