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Journal of Bacteriology, September 1998, p. 4360-4369, Vol. 180, No. 17
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Chromosomal Integration, Tandem Amplification, and
Deamplification in Pseudomonas putida F1 of a 105-Kilobase
Genetic Element Containing the Chlorocatechol Degradative Genes
from Pseudomonas sp. Strain B13
Roald
Ravatn,1,2
Sonja
Studer,1,2
Dirk
Springael,3
Alexander J. B.
Zehnder,1,2 and
Jan Roelof
van der
Meer1,*
Swiss Federal Institute for Environmental
Science and Technology (EAWAG)1 and
Swiss Federal Institute for Technology
(ETH),2 CH-8600 Dübendorf, Switzerland,
and
Vlaamse Instelling voor Technologisch Onderzoek (VITO),
B-2400 Mol, Belgium3
Received 7 April 1998/Accepted 18 June 1998
Analysis of chlorobenzene-degrading transconjugants of
Pseudomonas putida F1 which had acquired the genes for
chlorocatechol degradation (clc) from
Pseudomonas sp. strain B13 revealed that the
clc gene cluster was present on a 105-kb amplifiable
genetic element (named the clc element). In one such
transconjugant, P. putida RR22, a total of
seven or eight chromosomal copies of the entire genetic element were
present when the strain was cultivated on chlorobenzene. Chromosomal
integrations of the 105-kb clc element occurred in two
different loci, and the target sites were located within the 3' end of
glycine tRNA structural genes. Tandem amplification of the
clc element was preferentially detected in one locus on the
F1 chromosome. After prolonged growth on nonselective medium, transconjugant strain RR22 gradually diverged into subpopulations with
lower copy numbers of the clc element. Two nonadjacent
copies of the clc element in different loci always
remained after deamplification, but strains with only two copies
could no longer use chlorobenzene as a sole substrate.
This result suggests that the presence of multiple copies of the
clc gene cluster was a prerequisite for the growth of
P. putida RR22 on chlorobenzene and that amplification of the element was positively selected for in the presence of chlorobenzene.
*
Corresponding author. Mailing address: Swiss Federal
Institute for Environmental Science and Technology (EAWAG), CH-8600
Dübendorf, Switzerland. Phone: (41) 1-823-5438. Fax: (41)
1-823-5547. E-mail: vdmeer{at}eawag.ch.
Journal of Bacteriology, September 1998, p. 4360-4369, Vol. 180, No. 17
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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