A variety of aromatic hydrocarbon-degrading bacteria expressing different oxygenases were tested for their ability to produce indigo from indole. Styrene-grown cells of Pseudomonas putida S12 and CA-3 expressing styrene mono-oxygenase produced indigo at rates of 4–8 nmol min–1 mg dry wt–1. Toluene-grown cells of P. putida F1 and naphthalene-grown cells of P. putida PpG7 expressing dioxygenases formed indigo at rates of 1.5 and 2.5 nmol min–1 mg dry wt–1, respectively.
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