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. 1991 Oct;173(19):6207–6212. doi: 10.1128/jb.173.19.6207-6212.1991

Preferential transposition of an IS630-associated composite transposon to TA in the 5'-CTAG-3' sequence.

T Tenzen 1, E Ohtsubo 1
PMCID: PMC208372  PMID: 1655702

Abstract

A composite transposon, Tn4731, associated with IS630 has been shown to transpose preferentially to 5'-TA-3' sequences that are located at two sites in a rho-dependent transcription terminator in plasmid ColE1 in Escherichia coli (T. Tenzen, S. Matsutani, and E. Ohtsubo, J. Bacteriol. 172:3830-3836, 1990). Here we demonstrated that Tn4731 preferentially transposes to TA sequences at four sites in plasmid pUC118 and its derivatives: the TA sequence (hot spot I) in the intergenic region of phage M13 within the pUC sequence, the TA sequence (hot spot II) in the XbaI site in multiple cloning sites of the lacZ coding region, the TA sequence (hot spot III) in a spacer region flanked by inverted repeat sequences of a transcription terminator located downstream of the bla gene, and the TA sequence (hot spot IV) in the middle of bla. Transposition of Tn4731 to hot spot III was found not to require the inverted repeats in the terminator. Transposition of Tn4731 to hot spot II, which is located immediately downstream of the lacZ promoter, was not affected by mutations introduced into the promoter. There appear to be no particular sequences important for transposition of Tn4731 around each of the hot spots, except a palindromic sequence, 5'-CTAG-3', that contains the target sequence. Mutations introduced within the CTAG sequence at a hot spot inhibited Tn4731 from transposing to it, indicating that the CTAG sequence is responsible for the preferential transposition of Tn4731.

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Selected References

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