Target immunity of the Tn3-family transposon Tn4430 requires specific interactions between the transposase and the terminal inverted repeats of the transposon.
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.
Nicolas
Emilien
E
Institut des Sciences de la Vie, Université Catholique de Louvain, Louvain-la-Neuve, Belgium.
Lambin
Michaël
M
Hallet
Bernard
B
D004251:DNA Transposable Elements; D004269:DNA, Bacterial / Q000378:metabolism*; D004926:Escherichia coli / Q000235:genetics; D011485:Protein Binding; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D012097:Repressor Proteins / Q000235:genetics; D020079:Terminal Repeat Sequences; D019895:Transposases / Q000235:genetics / Q000378:metabolism*
D004251:DNA Transposable Elements; D004269:DNA, Bacterial; D011993:Recombinant Fusion Proteins; D012097:Repressor Proteins; D019895:Transposases