We have cloned the naphthalene dioxygenase(ND)-coding genes from Pseudomonas putida strain NCIB9816 based on their ability to convert indole to indigo. The region coding for this enzyme activity was sequenced and three successive open reading frames were found. The corresponding gene products were identified using the T7 polymerase/promoter system. All of them are necessary for the ND activity. A comparison of the ND-coding genes with the ones coding for benzene dioxygenase revealed significant homology which was more pronounced at the nucleotide level than at the amino acid level.
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