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Journal of Bacteriology, November 1999, p. 6929-6936, Vol. 181, No. 22
Unité de Programmation
Moléculaire et Toxicologie Génétique, CNRS URA 1444, Institut Pasteur, 75724 Paris Cedex 15, France
Received 30 July 1999/Accepted 10 September 1999
We demonstrate that IS1397, a putative mobile genetic
element discovered in natural isolates of Escherichia coli,
is active for transposition into the chromosome of E. coli
K-12 and inserts specifically into palindromic units, also called
repetitive extragenic palindromes, the basic element of bacterial
interspersed mosaic elements (BIMEs), which are found in intergenic
regions of enterobacteria closely related to E. coli and
Salmonella. We could not detect transposition onto a
plasmid carrying BIMEs. This unprecedented specificity of insertion
into a well-characterized chromosomal intergenic repeated element and
its evolutionary implications are discussed.
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
IS1397 Is Active for Transposition into
the Chromosome of Escherichia coli K-12 and Inserts
Specifically into Palindromic Units of Bacterial Interspersed
Mosaic Elements
*
Corresponding author. Mailing address: Unité de
Programmation Moléculaire et Toxicologie Génétique,
CNRS URA 1444, Institut Pasteur, 28 rue du Dr. Roux, 75724 Paris Cedex
15, France. Phone: (33) 01 40 61 32 88. Fax: (33) 01 45 68 88 34. E-mail: jclement{at}pasteur.fr.
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