Electroporation Protocol (C3020)


  1. Prepare 17 mm x 100 mm round-bottom culture tubes (e.g. VWR #60818-667) at room temperature. Place NEB® 10-beta/Stable Outgrowth Medium in a 37°C water bath. Pre-warm selective plates at 37°C for 1 hour.
  2. Place electroporation cuvettes (1 mm) and microcentrifuge tubes on ice.
  3. As a positive control for transformation, dilute the control pUC19 by 1:5 to a final concentration of 10 pg/μl using sterile water. Heat-denatured ligation reactions can be used for electroporation directly; however, column purification is recommended.
  4. Thaw NEB 10-beta Electrocompetent cells on ice (about 10 min) and mix cells by flicking gently. Transfer 25 μl of the cells (or the amount specified for the cuvettes) to a chilled microcentrifuge tube. Add 1 μl of the DNA solution.
  5. Carefully transfer the cell/DNA mix into a chilled cuvette without introducing bubbles and make sure that the cells deposit across the bottom of the cuvette. Electroporate using the following conditions for BTX ECM 630 and Bio-Rad GenePulser electroporators: 2.0 kV, 200 Omega, and 25 μF. The typical time constant is 4.8 to 5.1 milliseconds.
  6. Immediately add 975 µl of 37°C NEB 10-beta/Stable Outgrowth Medium to the cuvette, gently mix up and down twice, then transfer to the 17 mm x 100 mm round-bottom culture tube.
  7. Shake vigorously (250 rpm) or rotate at 37°C for 1 hour.
  8. Dilute the cells as appropriate then spread 100-200 μl cells onto a pre-warmed selective plate.
  9. Incubate plates overnight at 37°C.