Summary
In Rhizobium meliloti, Tn5 conferred resistance not only to kanamycin but to streptomycin, as well, in Escherichia coli, however only to kanamycin. Using in vitro recombinant DNA techniques, it was shown that the streptomycin resistance determinant was located downstream from the kanamycin resistance gene in the unique central region of Tn5. Expression of various cloned fragments of Tn5 suggested that both kanamycin and streptomycin resistance genes were transcribed from the same promoter. E. coli mutants allowing the expression of streptomycin resistance from Tn5 were isolated. The differential expression of the streptomycin resistance gene provides a simple selection/counterselection criterion, using only streptomycin in transfer expriments of Tn5 between E. coli and R. meliloti.
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Putnoky, P., Kiss, G.B., Ott, I. et al. Tn5 carries a streptomycin resistance determinant downstream from the kanamycin resistance gene. Mol Gen Genet 191, 288–294 (1983). https://doi.org/10.1007/BF00334828
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DOI: https://doi.org/10.1007/BF00334828