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. 1991 Dec;173(24):7802–7809. doi: 10.1128/jb.173.24.7802-7809.1991

Multiple copies of IS10 in the Enterobacter cloacae MD36 chromosome.

S Matsutani 1
PMCID: PMC212570  PMID: 1660455

Abstract

Repetitive sequences were isolated and characterized as double-stranded DNA fragments by treatment with S1 nuclease after denaturation and renaturation of the total DNA of Enterobacter cloacae MD36. One repetitive sequence was identical to the nucleotide sequence of IS10-right (IS10R), which is the active element in the plasmid-associated transposon Tn10. Unexpectedly, 15 copies of IS10R were found in the chromosomal DNA of E. cloacae MD36. One copy of the central region of Tn10 was found in the total DNA of E. cloacae MD36. IS10Rs in restriction fragments isolated from the E. cloacae MD36 total DNA showed 9-bp duplications adjacent to the terminal sequences that are characteristic of Tn10 transposition. This result suggests that many copies of IS10R in E. cloacae MD36 are due to transposition of IS10R alone, not due to transposition of Tn10 or to DNA rearrangement. I also found nine copies of IS10 in Shigella sonnei HH109, two and four copies in two different natural isolates of Escherichia coli, and two copies in E. coli K-12 strain JM109 from the 60 bacterial strains that were examined. All dam sites in the IS10s in E. cloacae MD36 and S. sonnei HH109 were methylated. Tn10 and IS10 transpose by a mechanism in which the element is excised from the donor site and inserted into the new target site without significant replication of the transposing segment; thus, the copy numbers of the elements in the cell are thought to be unchanged in most circumstances. Accumulation of IS10 copies in E. cloacae MD36 has interesting evolutionary implications.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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