Kan resistant plasmid growing in Amp
R.Jayakumar at RoswellPark.org
Thu Mar 3 00:34:11 EST 2005
How extraordinary? I am not talking about the pEGFP-C1 plasmid growing on ampicillin plates. But the fact that I mistakenlyy plated a E.coli strain carrying pEGFP-N1 on a plate with ampicillin and contrary to your observation othing grew on it. It is based onthe same backbone as yours and didn ot show any growth on ampicillin. I am not aware of the differences between pEGFP-N1 aand pEGPF-C1, but the difference could explain why your's is growing on ampicillin and mine is not.
From: owner-methods at hgmp.mrc.ac.uk on behalf of Kyle Legate
Sent: Wed 3/2/2005 5:39 PM
To: methods at hgmp.mrc.ac.uk
Subject: Kan resistant plasmid growing in Amp
Has anyone experienced this before? I can't find an explanation, and I
would really like one. I am cloning in pEGFP-C1, which contains a Kan
resistance cassette. I cut, ligated, plated, mini-prepped and
maxiprepped, all using Amp by default because 90% of my plasmids encode
Amp resistance. However, when I was making the data sheet for the new
plasmid I discovered that it encodes Kan resistance, not Amp resistance.
How could this be? How could a Kan resistant plasmid be amplified in
I am sure I didn't accidentally use a Kan stock, and I am sure I have
the correct product. I am not the only person who has experienced this;
a colleague did the exact same thing (different Kan resistant plasmid)
late last year.
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