Richard Lab:Restriction Digest

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Revision as of 11:12, 12 June 2009 by Michael A. Speer (talk | contribs) (Procedure)
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This protocol is typically used to do bio-brick digests with the restriction sites consisting of the following configuration:



  1. Quickly vortex all ingredients (Buffer, BSA, DNA, Enzymes) before beginning
  2. Add the following in a micro-centrifuge tube
    • 5μl of Buffer 2
    • 1μl of BSA
    • 42μl of DNA solution (Dilute PCR products in half)
  1. Vortex Enzymes and add 20 units (1μl) of each to the tube
  2. Incubate reaction in a 37°C water bath for at least one hour (I like 1:45).
    • Longer digest gives more complete digestion, especially if you have >1µg of DNA, but can sometimes give nonspecific digestion
  1. Heat kill the digest for 15 minutes at 70°C.
  2. If digesting a vector add 10 units (1µl) phosphatase) and 5µl Phosphatase Buffer and incubate an additional 45 minutes
  3. Heat-kill enzymes at 70°C for 15 min.
  4. Store digested DNA in the freezer (-20°C).


Please feel free to post comments, questions, or improvements to this protocol. Happy to have your input!

  1. If you're not getting good digestion it might be because your enzyme is bad. Double the digestion time and see


If you are needing to know more see the other restriction digest protocols.


or instead, discuss this protocol.