Fig. 3. Specific binding of nuclear proteins to ORE. The specificity of nuclear
extracts to radiolabeled ORE1 binding under different experimental conditions
is shown. Control (not challenged; column 1) and 8 h post in vivo
hypo-osmotic stress (column 2); competitive displacement in the presence of a
100-fold excess of unlabeled ORE-1 oligonucleotide (column 3); formation of a
nonspecific complex using a random oligonuclotide (column 4), and control
without nuclear extract (column 5). The arrow shows the putative
OREBP–ORE complex.