Enables several functions, including amino acid binding activity; aromatic-L-amino-acid decarboxylase activity; and pyridoxal phosphate binding activity. Involved in several processes, including aminergic neurotransmitter loading into synaptic vesicle; phenol-containing compound biosynthetic process; and response to pyrethroid. Located in axon; neuronal cell body; and synaptic vesicle. Used to study Parkinson's disease. Biomarker of Parkinson's disease; end stage renal disease; nephrotic syndrome; and portal hypertension. Human ortholog(s) of this gene implicated in Parkinson's disease; aromatic L-amino acid decarboxylase deficiency; bipolar disorder; and inherited metabolic disorder. Orthologous to human DDC (dopa decarboxylase). [provided by Alliance of Genome Resources, Apr 2022]