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Journal of Bacteriology, December 1999, p. 7298-7307, Vol. 181, No. 23
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Direct Selection of IS903 Transposon
Insertions by Use of a Broad-Host-Range Vector: Isolation of
Catalase-Deficient Mutants of Actinobacillus
actinomycetemcomitans
Valeri J.
Thomson,1,
Mrinal K.
Bhattacharjee,2
Daniel H.
Fine,3
Keith M.
Derbyshire,1,* and
David H.
Figurski2
Molecular Genetics Program, Wadsworth Center,
New York State Department of Health, and Department of Biomedical
Sciences, School of Public Health, State University of New York at
Albany, Albany, New York 122081;
Department of Microbiology, College of Physicians and
Surgeons, Columbia University, New York, New York
100322; and Department of Oral
Pathology and Biology, University of Medicine and Dentistry of New
Jersey, Newark, New Jersey 071033
Received 14 July 1999/Accepted 24 September 1999
Transposon mutagenesis in bacteria generally requires efficient
delivery of a transposon suicide vector to allow the selection of
relatively infrequent transposition events. We have developed an
IS903-based transposon mutagenesis system for diverse
gram-negative bacteria that is not limited by transfer efficiency. The
transposon, IS903
kan, carries a cryptic kan
gene, which can be expressed only after successful transposition. This
allows the stable introduction of the transposon delivery vector into
the host. Generation of insertion mutants is then limited only by the
frequency of transposition. IS903
kan was placed on an
IncQ plasmid vector with the transposase gene located outside the
transposon and expressed from
isopropyl-
-D-thiogalactopyranoside (IPTG)-inducible
promoters. After transposase induction, IS903
kan insertion mutants were readily selected in Escherichia coli
by their resistance to kanamycin. We used IS903
kan to
isolate three catalase-deficient mutants of the periodontal pathogen
Actinobacillus actinomycetemcomitans from a library of
random insertions. The mutants display increased sensitivity to
hydrogen peroxide, and all have IS903
kan insertions
within an open reading frame whose predicted product is closely related
to other bacterial catalases. Nucleotide sequence analysis of the
catalase gene (designated katA) and flanking intergenic
regions also revealed several occurrences of an 11-bp sequence that is
closely related to the core DNA uptake signal sequence for natural
transformation of Haemophilus influenzae. Our results
demonstrate the utility of the IS903
kan mutagenesis system for the study of A. actinomycetemcomitans. Because
IS903
kan is carried on a mobilizable, broad-host-range
IncQ plasmid, this system is potentially useful in a variety of
bacterial species.
*
Corresponding author. Mailing address: Wadsworth
Center, David Axelrod Institute, 120 New Scotland Ave., Albany, NY
12208. Phone: (518) 473-6079. Fax: (518) 486-7971. E-mail:
keith.derbyshire{at}wadsworth.org.

Present address: Department of Biology, Bard College,
Annandale-on-Hudson, NY 12504-5000.
Journal of Bacteriology, December 1999, p. 7298-7307, Vol. 181, No. 23
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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