subunit gene promoter region,− 238/+ 47, to identify cis and trans elements that are
important for basal activity in PC12 cells. Sequence analyses of the α3 promoter and
footprint assays revealed an Sp1 binding site between− 79 and− 57 (termed the α3 GA
motif) and an AP2 binding site between− 30 and− 7. Using mobility shift analysis, we found
that PC12 cell extracts contain proteins that specifically bind to the α3 GA motif and are …