Abstract
The rpsL gene of Escherichia coli was inserted into the BamHI site of transposon Tn5. This transposon was called Tn 5-rpsL. Tn 5-rpsL may be useful in microbiological studies when one wants to cure various bacterial genera of certain plasmid(s). A streptomycin-resistant (Sm R) derivative of the host bacterial strain is first isolated. The plasmid(s) later to be cured are then labelled with Tn 5-rpsL, which makes the cells Sm-sensitive. These cells can regain their resistance to Sm if they lose the Tn 5-rpsL-tagged plasmid. Thus, plasmid-free bacteria are easily selected among Sm R survivors. The frequency of occurrence of the plasmid-less variants of plasmid-containing wild-type Salmonella typhimurium measured by this method is given as an example.
Published Version
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