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Pathway for enzymatic conversion of TPA to PCA. (A) Organization of the operon of genes encoding a TPA-sensing transcription factor, TPA transporter domain, dioxygenase, reductase, and dehydrogenase. (B) TPADO (orange) uses molecular oxygen to dihydroxylate TPA, and reducing equivalents are supplied by the reductase (yellow). The product, DCD, is converted to protocatechuate via a Zn-dependent dehydrogenase (blue).
