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J. Biol. Chem., Vol. 265, Issue 31, 18829-18832, Nov, 1990

In vitro transposition of transposon Tn3

H Ichikawa and E Ohtsubo
Institute of Applied Microbiology, University of Tokyo, Japan.

Transposition of the ampicillin-resistant transposon Tn3 was reproduced in vitro using the Escherichia coli cell extract. In this cell-free system, we used plasmid DNA carrying mini-Tn3 as donor and phage lambda DNA as target and assayed for ampicillin-resistance transducing phages formed by cointegration of these DNA molecules. Ampicillin-resistance transducing phages, which were obtained by in vitro packaging of lambda DNA after the in vitro transposition reaction, were formed only in the presence of Tn3 transposase. The reaction required mini-Tn3 with the proper sequence and orientation of the terminal inverted repeats of Tn3. The reaction also required DNA synthesis but not RNA synthesis by E. coli RNA polymerase.
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