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two plasmids in yeast

R. D. Gietz GIETZ at BLDGHSC.Lan1.umanitoba
Wed Nov 2 16:11:34 EST 1994

In article <38uiol$pij at newsbf01.news.aol.com>, brianc4208 at aol.com
(BrianC4208) wrote:

> I agree that it is easier to transform with both plasmids at once, but I
> didn't realize that you could transform two plasmids with 2 micron
> replication origins into the same cell.  I was always under the impression
> that you had to have one on a centromeric plasmid.  Please correct me if I
> am mistaken, because it would make a big difference in an experiment I'm
> currently setting up for this week.
> Thanks,
> Brian Cohen
> Albany Medical College
> BrianC4208 at aol.com


Hey there
   I don't know if you EP or use LiAc to trafo, but if you use LiAc, I
know for a fact that you can stick in two at a time, I think we even did
three at once but then the efficiency is way down.

My boss has a bunch of good trafo papers out:
   Shiestl et. al. "Introducing DNA into yeast by Transformation" in
Methods: A Companion to methods in Enzymology.

I can't find the more recent paper in Methods in enz 'cause we're in the
midst of a lab move.  But I find that our methods are quicker easier and
less full of supersitions (though there are still some left in ??) than
other things I've heard people doing. 

Anyway save some time, live on the edge and definately do both at once, 
best to check copy number of each so you don't swamp with one.

Department of Human Genetics
University of Manitoba
Winnipeg, Manitoba, CANADA

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