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two questions

Joe Boutell boutell at cf.ac.uk
Wed Oct 2 11:03:55 EST 1996

nayers at utmem1.utmem.edu (nancy ayers) wrote:
>I have two questions: 1) What is the appropriate concentration of 3-AT on
>-HIS plates (I am using HF7c with a leaky promter and wish to reduce the #
>of false positive colonies I get). I have looked for it but am unable to
>locate this info.  and 2) has anyone made a high expression vector with
>the full length ADH promoter for two-hybrid that has the same MCS as
>clonetech's original pGBT9 and pGAD424??  I am using these vectors now but
>would like to possibly move to higher expressing vectors...with relatively
>little effort. I know that they have vectors with the full length ADH but
>the MCS are different.
>Thanks!!!  Any and all help is appreciated!
>nayers at utmem1.utmem.edu

Hi Nancy!

We use strain Y190 from Clontech (which has leaky His expression) and 
find that 25mM 3-AT final concentration in the -His plates works well for 
screening. However, is your leaky expression in HF7c due to a change in 
the yeast itself, or is it expression due to activation by your bait 
plasmid?? When we were using HF7c we didn't use 3-AT at all.

Joe Boutell.

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