E Overexpression of DCAF12 decreases wild-type MAGE-A3, but not MAGE-A3 degron mutant. The indicated constructs were expressed for 48 hrs in HeLa cells before immunoblotting. The MAGE-A3 degron mutant was created ], in which DNYNEPKANQ* were added to the extreme C-term to obscure the DCAF12 degron motif. 