Dopa decarboxylase (DDC), also known as AADC, is a homodimeric vitamin B6-dependent enzyme that catalyzes the decarboxylation of hydroxylated aromatic amino acids. DDC is expressed in the adrenal medulla and catecholaminergic neurons. It catalyzes the final step in the synthesis of the neurotransmitters dopamine and serotonin. Defects in DDC are associated with the development of schizophrenia, Parkinson's disease, and hypertension. Human DDC shares 89% aa sequence identity with mouse and rat DDC.
Image: Western blot of rat adrenal medulla. As shown in the autoradiograph, the antibody is specific for the ~55k DDC protein.