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. 1992 Dec;174(23):7542–7554. doi: 10.1128/jb.174.23.7542-7554.1992

Bacterial metabolism of naphthalene: construction and use of recombinant bacteria to study ring cleavage of 1,2-dihydroxynaphthalene and subsequent reactions.

R W Eaton 1, P J Chapman 1
PMCID: PMC207464  PMID: 1447127

Abstract

The reactions involved in the bacterial metabolism of naphthalene to salicylate have been reinvestigated by using recombinant bacteria carrying genes cloned from plasmid NAH7. When intact cells of Pseudomonas aeruginosa PAO1 carrying DNA fragments encoding the first three enzymes of the pathway were incubated with naphthalene, they formed products of the dioxygenase-catalyzed ring cleavage of 1,2-dihydroxynaphthalene. These products were separated by chromatography on Sephadex G-25 and were identified by 1H and 13C nuclear magnetic resonance spectroscopy and gas chromatography-mass spectrometry as 2-hydroxychromene-2-carboxylate (HCCA) and trans-o-hydroxybenzylidenepyruvate (tHBPA). HCCA was detected as the first reaction product in these incubation mixtures by its characteristic UV spectrum, which slowly changed to a spectrum indicative of an equilibrium mixture of HCCA and tHBPA. Isomerization of either purified product occurred slowly and spontaneously to give an equilibrium mixture of essentially the same composition. tHBPA is also formed from HCCA by the action of an isomerase enzyme encoded by plasmid NAH7. The gene encoding this enzyme, nahD, was cloned on a 1.95-kb KpnI-BglII fragment. Extracts of Escherichia coli JM109 carrying this fragment catalyzed the rapid equilibration of HCCA and tHBPA. Metabolism of tHBPA to salicylaldehyde by hydration and aldol cleavage is catalyzed by a single enzyme encoded by a 1-kb MluI-StuI restriction fragment. A mechanism for the hydratase-aldolase-catalyzed reaction is proposed. The salicylaldehyde dehydrogenase gene, nahF, was cloned on a 2.75-kb BamHI fragment which also carries the naphthalene dihydrodiol dehydrogenase gene, nahB. On the basis of the identification of the enzymes encoded by various clones, the gene order for the nah operon was shown to be p, A, B, F, C, E, D.

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Selected References

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