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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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