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Streptococcus salivarius

Multiporator / Electroporator 2510 Transformation Protocol Protocol No. 4308 915.541 03/2002 Microorganism Streptococcus salivarius Cell type Bacteria, gram positive Molecules injected Plasmid DNA Growth medium HJGS (Hogg-Jago glucose broth with 0.4 sorbitol) Washing solution 5 mM potassium phosphate (pH 4.5), 0.4 M sorbitol, 10% glycerol Electroporation solution 5 mM potassium phosphate (pH 4.5), 0.4 M sorbitol, 10% glycerol Outgrowth medium HJGS (Hogg-Jago glucose broth with 0.4 sorbitol) Cuvette 1 mm gap width Reference Buckley, N. D. et al 1999 Applied and Environmental Microbiology 65, No. 9 3800-3804 Making electrocompetent cells:

1. Cultivate cells by adding 1% overnight preculture to fresh medium. Grow cells at 37 C without agitation to a cell
density of O.D.660 of 0.5. Add glycine to a final concentration of 10% and incubate again for 1 h at 37 C. 2. Harvest by centrifugation. 3. Wash twice in ice-cold washing solutio n. 4. Resuspend in electroporation solution to a 50-fold concentration and freeze in an ethanol-dry ice bath. Store at -80 C.

Electroporation of cells:

  1. Thaw cells on ice. Add 1 g plasmid DNA to 100 l of electrocompetent cells. Homogenize by gently mixing with pipette several times. Transfer mixture into a prechilled cuvette.
  2. Wipe moisture from the cuvette and insert the cuvette into the device.
  3. Electroporation:

    Mode Prokaryotes O Voltage (V) 1,600 V Time constant (T) 5 ms
  4. Add 1 ml ice-cold outgrowth medium and incubate for 3 h at 37 C.
  5. Plate aliquots onto selective agar plates; incubate 2-3 days at 37 C.
Expected Results: Transformation efficiency up to 1 x 105 transformants/g of DNA.


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