Multiporator / Electroporator 2510 Transformation Protocol Protocol No. 4308 915.540 07/2002 Microorganism Pediococcus spp. Cell type Bacteria, gram positive Molecules injected Plasmid DNA (pGK12 and pPN-1) Growth medium MRS-G with 0.5 M sorbitol, 3 % glycine and 40 mM DL-threonine Washing solution 0.5 M sorbitol, 10 % glycerol Electroporation solution 0.5 M sorbitol, 1 mM K₂HPO₄, 1mM MgCl₂, pH 7.0 Outgrowth medium MRS with 0.5 M sorbitol, 20 mM MgCl₂ and 2 mM CaCl₂ Cuvette 1 mm gap width Reference Caldwell, S. L. et al 1996 Applied and Environmental Microbiology 62, No. 3 936-941 Making electrocompetent cells:

1. Cultivate cells by adding 12 ml overnight preculture (grown in MRS-G with 0.5 M sorbitol) to 800 ml growth medium. Incubate for 2 to 4 hours at 37 C to a cell density of O.D.₆₀₀ of 0.4-0.6. 2. Harvest by centrifugation. 3. Wash twice in 25 ml washing solution. 4. Resusp
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1. Pediococcus spp.