Are they true positves?
debbritt at brownvm.brown.edu
Mon Apr 8 14:15:52 EST 1996
<Pine.A32.3.92a.960404150516.102753B-100000 at homer12.u.washington.edu>,
Seng-Lai Tan <sltan at u.washington.edu> wrote:
> I've just done a yeast 2-hybrid screen using the Clontech Matchmaker kit.
> I made my own library using Stratagene HybridZap kit. I had some
> pink colonies that grew on -His plates but they looked weird or different
> from positve control Hf7c strain containing P53 and T Ag. They also didn't
> smell right. They, nevertheless, turned blue on beta-gal lift assays.
> Although, I was very careful when plating my cells, I now wonder if my
> colonies are contaminants. Are there any bacteria or any other bugs that
> can grow on -His plates, look pink and use X-gal as subtrate?
> Please help. Many thanks in advance.
I don't have any personal experience with this, but there are bacteria that
grow on just about anything. You can easily tell if it is bacterial
contamination by doing a Gram stain, or even by a wet-mount slide. Check
with someone who has training in Microbiology. Good luck.
Deborah Britt, Ph.D.
RI Hospital/Brown University
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