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J. Bacteriol., Jan 1998, 178-181, Vol 180, No. 1
M Odaert, A Devalckenaere, P Trieu-Cuot and M Simonet
The genome of Yersinia pestis, the causative agent of plague, contains at
least 30 copies of an element, designated IS1541, which is structurally
related to IS200 (85% identity). One such element is inserted within the
chromosomal inv gene (M. Simonet, B. Riot, N. Fortineau, and P. Berche,
Infect. Immun. 64:375-379, 1996). We characterized other IS1541 insertions
by cloning 14 different Y. pestis 6/69M loci carrying a single copy of this
insertion sequence (IS) into Escherichia coli and, for each element,
sequencing 250 bp of both flanking regions. In no case was this IS element
inserted into large open reading frames; however, in eight cases, it was
detected downstream (17 to 139 bp) of genes thought to be transcribed
monocistronically or which constituted the last gene of an operon, and in
only one case was it detected upstream (37 bp) of the first gene of an
operon. Sequence analysis revealed stem-loop structures (deltaG, < - 10
kcal) resembling rho-independent transcription terminators in 8 of the 14
insertion sites. These motifs might constitute hot spots for insertion of
this IS1541 element within the Y. pestis genome.
Copyright © 1998, American Society for Microbiology
Molecular characterization of IS1541 insertions in the genome of Yersinia pestis [In Process Citation]
Laboratoire de Bacteriologie-Hygiene, Faculte de Medecine Henri Warembourg, Lille, France.
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