1. Aspartate transaminase (AST) or Aspartate aminotransferase, also known as AspAT/ASAT/AAT or (serum) glutamic oxaloacetic transaminase (GOT, SGOT), is a pyridoxal phosphate (PLP)-dependent transaminase enzyme (EC 2.6.1.1) that was first described by Arthur Karmen and colleagues in 1954.

2. HT and CAs, respectively (Figure 2).histidine decarboxylase (HDC, EC 4.1.1.22) and Aromaticin mammalian cells, B/A-BA synthesis involves the action of three pyridoxal 5 -phosphate (PLP)-dependent enzymes: ornith ine decarboxylase (ODC, EC 4.1.1.17), histidine decarboxylase (HDC, EC 4.1.1.22) and aromatic L-amino acid decarboxylase (or DOPA

3. Aspartate transaminase (AST) (ASAT) [ah-spahr´tāt trans-am´ĭ-nās] an enzyme that catalyzes the reversible transfer of an amino group from Aspartate to α-ketoglutarate to form glutamate and oxaloacetate, requiring the coenzyme pyridoxal phosphate; it is normally present in serum and in various body tissues, especially in the heart and liver