In this chapter, a highly sensitive method to measure plasmid stability in Gram-negative bacteria is described. This procedure is based on the counterselection of plasmid-containing cells using an aph-parE cassette. When bacteria carrying the aph-parE module in the plasmid of interest are grown in media containing rhamnose as the only carbon source, the PparE promoter is induced, ParE is synthesized, and plasmid-containing cells are eliminated; bacteria that have lost the plasmid survive. The absence of the kanamycin resistance marker (aph) can be used to confirm the loss of the plasmid in rhamnose grown bacteria.
CITATION STYLE
Lobato-Márquez, D. (2020). Measuring Plasmid Stability in Gram-Negative Bacteria. In Methods in Molecular Biology (Vol. 2075, pp. 223–233). Humana Press Inc. https://doi.org/10.1007/978-1-4939-9877-7_16
Mendeley helps you to discover research relevant for your work.