Maloof Lab:Cell Transformation

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Room 2115
Section of Plant Biology
1002 Life Sciences, One Shields Ave.
University of California Davis
Davis, CA 95616

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E. coli (DH5α chemically-competent) Transformation


  1. Thaw one aliquot of DH5α competent cells (from –80°C freezer) on ice
  2. Add 1-5 μl DNA and 75 μl competent cells to new cell culture tube. Do not mix the cells by pipetting. Just tap the tube gently
  3. Incubate on ice for 30 minutes
  4. Heat shock in 42°C water bath for exactly 30 seconds. Do not mix or shake
  5. Cool on ice
  6. Add 900 μl liquid media (e.g. LB) to cell culture tube
  7. Shake at 37°C for 40-60 minutes
  8. Centrifuge at 5000 rpm for 2 minutes
  9. Remove all but 100-150 μl of the LB and resuspend pellet
  10. Spread 100-150 μl on plate of media + antibiotic (e.g. LB agar + carb)
  11. Incubate plates up-side-down, overnight at 37°C
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