Pyridoxal phosphate phosphatase, also known as PDXP is the enzyme belongs to the family of hydrolases, specifically those acting on phosphoric monoester bonds. PDXP catalyzes the dephosphorylation of pyridoxal 5'-phosphate and exhibits a high level of expression various parts of the central nervous system, especially the brain. PDXP activity is catalyzed by haloacid dehalogenase (HAD), and it is the cofactor of both aromatic L-amino acid decarboxylase and glutamate decarboxylase.