Protocol Online logo
Top : New Forum Archives (2009-): : Molecular Biology

Huge Smear in EMSA - (Nov/25/2013 )

I am using biotin labeled oligos and I am getting just a giant smear all the way down the lane. I have tried diluting the amount of biotin labeled oligo I'm using and while the intensity of the smear decreases, there is still a smear down the entire lane. I can tell that there are bands at certain places but I would like to clean it up. I am using 2ug protein and poly di/dc. Would it be helpful to add in other components to the binding reaction or should I continue to try diluting my biotin labeled oligos?


Any help is greatly appreciated!!


How about the lane with oligo minus proteins - do you get similar smear? Are you using nuclear extracts or other protein?