D. Super-shift EMSA analysis of TFIIA binding to yTBPDNA complex. We incubated 5 nM FAM-labeled DNA and yTBP (0.5 μM) with indicated concentrations of purified TFIIA (0.08 to 5 μM) and then analyzed binding by 6% non-denaturing PAGE. Band intensities of free DNA from the gels (Top panel) were quantified and plotted (Bottom panel). 