direct digestion of colony PCR product

Dunowska, Magda via (by M.Dunowska from
Thu Apr 7 16:32:18 EST 2011

Marta, I think that as long as your restriction enzymes are compatible with your PCR buffer you shouldn't have any problems digesting the PCR product without prior purification. If unsure, just try it - it's not a lot of time/effort to add the restriction enzyme to the un-purified PCR product, incubate it for the desired length of time, and then run the digest on a'd have to cut the bands out of the gel for ligations.
Good luck,

-----Original Message-----
From: methods-bounces from [mailto:methods-bounces from] On Behalf Of Marta
Sent: Friday, 8 April 2011 1:38 a.m.
To: methods from
Subject: direct digestion of colony PCR product

I made a colony PCR to verify my clones in that way: I picked up a colony to PCR mix: Buffer (10X) 3.0µL, DNTPs (2.5 mM each) 3.0µL, Taq
(5 units/µL), Forward Primer (20 µM) Reverse Primer (20 µM) Water; TOTAL 30µL.
Now I want to digest my PCR product by: BamHI an XhoI and the ligate insert to expression vector pET28b+.
To save time and money I want to digest PCR mixture directly without any purification. I am not really sure that this way is correct. Do contaminations like bacteria cell components disturb restriction reaction?
I know that they can disturb.... but I don't need 100% efficiency.
So is there a posibility to obtain positive digestion and then ligation?

Please help me

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