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Journal of Bacteriology, April 2000, p. 2191-2199, Vol. 182, No. 8
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Roles of Horizontal Gene Transfer and Gene
Integration in Evolution of 1,3-Dichloropropene- and
1,2-Dibromoethane-Degradative Pathways
Gerrit J.
Poelarends,1
Leonid A.
Kulakov,2
Michael J.
Larkin,2
Johan E. T.
van Hylckama Vlieg,1 and
Dick B.
Janssen1,*
Department of Biochemistry, Groningen
Biomolecular Sciences and Biotechnology Institute, University of
Groningen, 9747 AG Groningen, The Netherlands,1
and The Questor Centre, The Queen's University of Belfast,
Belfast BT9 5AG, United Kingdom2
Received 10 November 1999/Accepted 27 January 2000
The haloalkane-degrading bacteria Rhodococcus
rhodochrous NCIMB13064, Pseudomonas pavonaceae 170, and Mycobacterium sp. strain GP1 share a highly conserved
haloalkane dehalogenase gene (dhaA). Here, we describe the
extent of the conserved dhaA segments in these three
phylogenetically distinct bacteria and an analysis of their flanking
sequences. The dhaA gene of the 1-chlorobutane-degrading strain NCIMB13064 was found to reside within a 1-chlorobutane catabolic
gene cluster, which also encodes a putative invertase (invA), a regulatory protein (dhaR), an alcohol
dehydrogenase (adhA), and an aldehyde dehydrogenase
(aldA). The latter two enzymes may catalyze the oxidative
conversion of n-butanol, the hydrolytic product of
1-chlorobutane, to n-butyric acid, a growth substrate for
many bacteria. The activity of the dhaR gene product was
analyzed in Pseudomonas sp. strain GJ1, in which it
appeared to function as a repressor of dhaA expression. The
1,2-dibromoethane-degrading strain GP1 contained a conserved DNA
segment of 2.7 kb, which included dhaR, dhaA,
and part of invA. A 12-nucleotide deletion in
dhaR led to constitutive expression of dhaA in
strain GP1, in contrast to the inducible expression of dhaA
in strain NCIMB13064. The 1,3-dichloropropene-degrading strain 170 possessed a conserved DNA segment of 1.3 kb harboring little more than
the coding region of the dhaA gene. In strains 170 and GP1,
a putative integrase gene was found next to the conserved
dhaA segment, which suggests that integration events were
responsible for the acquisition of these DNA segments. The data
indicate that horizontal gene transfer and integrase-dependent gene
acquisition were the key mechanisms for the evolution of catabolic
pathways for the man-made chemicals 1,3-dichloropropene and
1,2-dibromoethane.
*
Corresponding author. Mailing address: Department of
Biochemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands. Phone: 31-50-3634209. Fax: 31-50-3634165. E-mail: d.b.janssen{at}chem.rug.nl.
Journal of Bacteriology, April 2000, p. 2191-2199, Vol. 182, No. 8
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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