In article <beavis-0212951411380001 at drwpowermac.med.utah.edu>,
beavis at butthead.utah.edu (beavis) wrote:
> In article <30BD8A2C.58C9 at medkem.umu.se>, Eric Hanson
> <Eric.Hansson at medkem.umu.se> wrote:
>> > Thanks,
> > Eric
>> When I've done gel shift experiments with whole yeast cell extracts I will
> first add the "cold" competitor DNA to the reacation containing the yeast
> extract, incubate for 15 minutes--I then add the labeled DNA, incubate for
> an additional 15 minutes and then load the gel.
JRS, this is not competition. You have to add the competitor at the same
time as the labeled ligand (DNA) in order to have a truely competitive
system. I have no answer to the original question, but if he did the
experiment this way, he would not be looking at competitive inhibition of
Stephen R. Lasky Ph.D. Brown U/Roger Williams Medical Center, Providence, RI.
Phone: 401-456-5672 Fax: 401-456-6569 e:mail: Stephen_Lasky at brown.edu
America may be unique in being a country which has leapt from barbarism to decadence without touching civilization. John O'Hara.