double transformation

Jayakumar, R R.Jayakumar at
Fri May 12 14:35:54 EST 2006

Which cell?  If it is E.coli.. Then "everyone" is right.  For some
reason, E.coli maintains only one plasmid.  I don't know why, but I am
sure someone out there should know. But if you can explain the reason as
to why you want two plasmids inside, members can suggest an alternative
way of doing the same.
Best of luck

-----Original Message-----
From: methods-bounces at
[mailto:methods-bounces at] On Behalf Of willy
Sent: Friday, May 12, 2006 12:04 PM
To: methods at
Subject: double transformation


i'm trying to do a double transformation of 2 plasmids with the same
ori. i just can't bring them into my cells. i varied the dna amount.
when i make the cell compatible with one plasmid and electroporate the
other one inside i get clones, but i think, and everyone in the lab
tells me that the cells will lose one plasmid.

can u help me


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