The first highly efficient protocol is described for the electrotransfection of Propionibacterium freudenreichii with DNA phage. The transfection efficiency is 7 times 105 transfectants per μg of DNA under optimal conditions. Optimized parameters included the field strength (12.5 kV, 200 Ohms, 25 μF), phage DNA concentration (1 μg ml-1) and cell density (1.5 times 1010 cells ml-1). Growth in the presence of glycine and harvesting of cells during the early exponential growth phase increased the transfection efficiency. This electrotransfection protocol is of importance for the genetic improvement of dairy propionibacteria.
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Gautier et al. (1995) studied this question.
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