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Conditional mutant

Shuang Liang sxl29 at po.CWRU.Edu
Wed Jun 15 08:54:19 EST 1994

Dear Netters:

I have tried hard to construct a strain in which a gene of my interest
is under the control of a Gal promotor. I know the gene is essential, 
it is toxic when the expression is high. The strategy that I used is
to replace the chromosomal allele by an in vitro constructed 5'UTR-Gal
ORF. Unfortunately, this is not very helpful because that integration
seems to occur somewhere else or the basal expression is high enough
to allow the growth. Although I have used a varieties of combination
of galactose/glucose, galactose/raffinose, colonies grown on these
medium can also grow on glucose containing media. 
So I would like to know whether someone in this group has ever encountered
this kind of problem. I would like to hear your suggestions, too.

Shaung Liang
Institute of Pathology
Case Western Reserve University
2085 Adelbert Rd.
Cleveland, OH 44106
Fax: (216) 368-5484
Phone: (216) 368-5183
e-Mail: SXL29 at PO.CWRU.EDU

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