big DNA in XL-1 cells

[Dr Dave Parcej]

Hi
We also had trouble with big plasmids in XL1-Blue. Now we use Top10F (from
Invitrogen). These have much higher transformation efficiencies for the
large  vector and are fully compatible with blue/white screening.
Hope this helps
Dave


In article <34F5B79B.542686C5 at pharm.med.upenn.edu>, Yelena Shifman
<shifman at pharm.med.upenn.edu> wrote:

> Dear Colligues!
> I got a real problem. We subcloned a piece of CREB = 9Kb (the whole gene=25Kb)
> into Bluescipt. After transformation Xl-1 cells grew extreemely slow (it took
> 3 days just to get normal saturated culture). We tried other cells Xl-Gold,
> DH5alpha) with the same effect.
> Either CREB makes something really toxic or else... 
> I would appreciate any suggestions.
> 
> Y. Shifman
> Shifman at pharm.med.upenn.edu