C Nutrient deprivation increases endogenous DCAF12 binding to MAGE-A3. HeLa cells were transfect with Myc-vector or Myc-MAGE-A3 for 48 hrs. Cells were then treated with 10 µM MG132 in complete media, EBSS, or EBSS containing 20 µg/mL insulin for 6 hrs. Cell extracts were subjected to anti-Myc IP. 