Protocol for Dephosphorylation of 5´-ends of DNA using CIP (NEB #M0290)

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Protocol

  1. Prepare a 20 μl reaction as follows:

    DNA 1 pmol of DNA ends*
    CutSmart®  Buffer (10X) 2 μl
    CIP 1 unit
    H2O, purified to 20 μl**
     

  2. Incubate at 37°C for 30 minutes.

  3. Purify DNA by gel purification, spin-column or
    phenol extraction.

* Note: 1 pmol of DNA ends is about 1 μg of a 3 kb plasmid.
** Scale larger reaction volumes proportionally.


Dephosphorylation of 5´-ends of DNA in Restriction Enzyme Reaction


  • The phosphate can be added directly into the digestion reaction during or after DNA digestion
  • CIP is active in all NEB restriction enzyme buffers
  • DNA purification is required before ligation