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Specificity of the Tn4430 target immunity signal was examined by fusing the transposase TnpA to the LacI repressor of Escherichia coli. The resulting chimeric proteins failed to impose immunity to DNA targets carrying copies of the lacO operator, though they were proficient in lacO binding in vivo and remained responsive to wild-type immunity conferred by the Tn4430 inverted repeat end. Intriguingly, the presence of lacO repeats within the target was found to strongly influence target site selection by Tn4430, but in a LacI-independent manner.

journal of bacteriology

Target Immunity of the Tn <i>3</i> -Family Transposon Tn <i>4430</i> Requires Specific Interactions between the Transposase and the Terminal Inverted Repeats of the Transposon

Target Immunity of the Tn 3 -Family Transposon Tn 4430 Requires Specific Interactions between the Transposase and the Terminal Inverted Repeats of the Transposon