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Factors That Affect Transposition Mediated By The Tn21 Transposase.

J. Grinsted, C. Martín, F. de la Cruz
Published 1988 · Biology, Medicine

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The frequencies of one-ended transposition mediated by the Tn21 transposase acting on plasmids containing 38-bp inverted repeat sequences (IRs) of both Tn21 and of Tn501/Tn1721 and Tn2501 were measured. The enzyme acted on all these IRs, but more efficiently on the homologous sequences. These differences were magnified when the enzyme acted on plasmids containing two copies of the IRs, inverted with respect to each other. The Tn21 enzyme did not recognize the IR of Tn3. The Tn501 transposase did not mediate measurable one-ended transposition of any of the plasmids used, including those containing an IR of Tn501.
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