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J Bacteriol, May 1998, p. 2522-2530, Vol. 180, No. 9
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

A Gene Cluster Encoding Steps in Conversion of Naphthalene to Gentisate in Pseudomonas sp. Strain U2

Sergio L. Fuenmayor,1 Mark Wild,2 Alastair L. Boyes,2 and Peter A. Williams1,*

School of Biological Sciences1 and Department of Chemistry,2 University of Wales, Bangor, Gwynedd LL57 2UW, Wales, United Kingdom

Received 14 October 1997/Accepted 23 February 1998

Pseudomonas sp. strain U2 was isolated from oil-contaminated soil in Venezuela by selective enrichment on naphthalene as the sole carbon source. The genes for naphthalene dioxygenase were cloned from the plasmid DNA of strain U2 on an 8.3-kb BamHI fragment. The genes for the naphthalene dioxygenase genes nagAa (for ferredoxin reductase), nagAb (for ferredoxin), and nagAc and nagAd (for the large and small subunits of dioxygenase, respectively) were located by Southern hybridizations and by nucleotide sequencing. The genes for nagB (for naphthalene cis-dihydrodiol dehydrogenase) and nagF (for salicylaldehyde dehydrogenase) were inferred from subclones by their biochemical activities. Between nagAa and nagAb were two open reading frames, homologs of which have also been identified in similar locations in two nitrotoluene-using strains (J. V. Parales, A. Kumar, R. E. Parales, and D. T. Gibson, Gene 181:57-61, 1996; W.-C. Suen, B. Haigler, and J. C. Spain, J. Bacteriol. 178:4926-4934, 1996) and a naphthalene-using strain (G. J. Zylstra, E. Kim, and A. K. Goyal, Genet. Eng. 19:257-269, 1997). Recombinant Escherichia coli strains with plasmids carrying this region were able to convert salicylate to gentisate, which was identified by a combination of gas chromatography-mass spectrometry and nuclear magnetic resonance. The first open reading frame, designated nagG, encodes a protein with characteristics of a Rieske-type iron-sulfur center homologous to the large subunits of dihydroxylating dioxygenases, and the second open reading frame, designated nagH, encodes a protein with limited homology to the small subunits of the same dioxygenases. Cloned together in E. coli, nagG, nagH, and nagAb, were able to convert salicylate (2-hydroxybenzoate) into gentisate (2,5-dihydroxybenzoate) and therefore encode a salicylate 5-hydroxylase activity. Single-gene knockouts of nagG, nagH, and nagAb demonstrated their functional roles in the formation of gentisate. It is proposed that NagG and NagH are structural subunits of salicylate 5-hydroxylase linked to an electron transport chain consisting of NagAb and NagAa, although E. coli appears to be able to partially substitute for the latter. This constitutes a novel mechanism for monohydroxylation of the aromatic ring. Salicylate hydroxylase and catechol 2,3-dioxygenase in strain U2 could not be detected either by enzyme assay or by Southern hybridization. However growth on both naphthalene and salicylate caused induction of gentisate 1,2-dioxygenase, confirming this route for salicylate catabolism in strain U2. Sequence comparisons suggest that the novel gene order nagAa-nagG-nagH-nagAb-nagAc-nagAd-nagB-nagF represents the archetype for naphthalene strains which use the gentisate pathway rather than the meta cleavage pathway of catechol.


* Corresponding author. Mailing address: School of Biological Sciences, Memorial Building, University of Wales, Bangor, Gwynedd LL57 2UW, Wales, United Kingdom. Phone: (44) 1248 382363. Fax: (44) 1248 370731. E-mail: P.A.Williams{at}bangor.ac.uk.


J Bacteriol, May 1998, p. 2522-2530, Vol. 180, No. 9
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.



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