Purification of HCE-Gly52R ATCase. SDS PAGE (a) and nondenaturing PAGE (b) visualized by coomassie blue stain (a and b, left) or fluorescence (a and b, right) of the purification of the HCE-Gly52R ATCase. Lanes 1, wild-type ATCase; Lanes 2, E. coli ATCase c3 containing a C-terminal His tag; Lanes 3, total soluble protein from cell lysate; Lanes 4, HCE-Gly52R ATCase after column purification employing Chelating Sepharose Fast Flow (GE Healthcare) charged with Ni2+; Lanes 5, HCE-Gly52R ATCase after column purification employing Phenyl Sepharose (GE Healthcare).