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. 1993 Nov;175(21):6890–6901. doi: 10.1128/jb.175.21.6890-6901.1993

Metabolism of dibenzothiophene and naphthalene in Pseudomonas strains: complete DNA sequence of an upper naphthalene catabolic pathway.

S A Denome 1, D C Stanley 1, E S Olson 1, K D Young 1
PMCID: PMC206814  PMID: 8226631

Abstract

From a soil isolate, Pseudomonas strain C18, we cloned and sequenced a 9.8-kb DNA fragment that encodes dibenzothiophene-degrading enzymes. Nine open reading frames were identified and designated doxABDEFGHIJ. Collectively, we refer to these genes as the DOX pathway. At the nucleotide level, doxABD are identical to the ndoABC genes that encode naphthalene dioxygenase of Pseudomonas putida. The DoxG protein is 97% identical to NahC (1,2-dihydroxynaphthalene dioxygenase) of P. putida. DoxE has 37% identity with cis-toluene dihydrodiol dehydrogenase. DoxF is similar to the aldehyde dehydrogenases of many organisms. The predicted DoxHIJ proteins have no obvious sequence similarities to known proteins. Gas chromatography with a flame ionization detector and mass spectroscopy confirmed that the DOX proteins convert naphthalene to salicylate and converting phenanthrene to 1-hydroxy-2-naphthoic acid. doxI mutants convert naphthalene to trans-o-hydroxybenzylidenepyruvate, indicating that the DoxI protein is similar to NahE (trans-o-hydroxybenzylidenepyruvate hydratase-aldolase). Comparison of the DOX sequence with restriction maps of cloned naphthalene catabolic pathway (NAH) genes revealed many conserved restriction sites. The DOX gene arrangement is identical to that proposed for NAH, except that the NAH equivalent of doxH has not been recognized. DoxH may be involved in the conversion of 2-hydroxy-4-(2'-oxo-3,5-cyclohexadienyl)-buta-2,4-dienoat e to cis-o-hydroxybenzylidenepyruvate. doxJ encodes an enzyme similar to NahD (isomerase). Our findings indicate that a single genetic pathway controls the metabolism of dibenzothiophene, naphthalene, and phenanthrene in strain C18 and that the DOX sequence encodes a complete upper naphthalene catabolic pathway similar to NAH.

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Selected References

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