Abstract
A restriction fragment of the bacteriophage P1 genome known to serve as a hot target for IS2 insertion in its host, Escherichia coli K12, was entirely sequenced. It is 1756 bp long and it contains four long open reading frames, all in the same orientation. The two middle frames overlap partially. Eight of the nine studied IS2 insertions affecting phage reproduction map within three of these reading frames. No common feature was found between the nine target sites which have served for IS2 integration. However, there are two structural elements which might possibly contribute to rendering the studied DNA segment a hot region for IS2 insertion. The first is formed by two neighbouring, 30 and 40 bp regions of homology with an internal segment of IS2. The second is the pentanucleotide 5' GGTAT3', which is carried nine times in the sequenced fragment and which is found always in at least one copy within a variable distance of less than 100 bp of each inserted IS2 element.
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Selected References
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