Phosphatase treatment of linearized vector

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To minimize self-ligated vector in your transformation, treat your linearized vector with a phosphatase to remove the 5' phosphates necessary for ligation. This should improve the percentage of colonies with inserts.



  1. Add Antarctic Phosphatase buffer to a final concentration of 1X to linearized vector sample.
  2. Add 1μL Antarctic Phosphatase (probably should make final glycerol concentration less that 5%?)
  3. Incubate 60 mins at 37°C.
    This should be sufficient to remove 5' phosphates even from 5' recessed ends like those produced by Pst I.
  4. Heat-inactivate for 5 mins at 65°C.
  5. Proceed directly to ligation step.


NEB's Antarctic Phosphatase