Amino Acid Decarboxylase (氨基酸脱羧酶)

Amino acid decarboxylases are a class of enzymes that catalyze the removal of the carboxyl group from specific amino acids to produce biologically active amines. These enzymes are widely involved in various physiological processes, particularly in the synthesis of neurotransmitters and polyamines. Aromatic L-amino acid decarboxylase (AADC), histidine decarboxylase (HDC), and S-adenosylmethionine decarboxylase (SAMDC) all belong to the amino acid decarboxylase family, each playing an important role in different metabolic pathways to regulate cellular functions.
AADC is primarily responsible for converting aromatic amino acid precursors l-DOPA and 5-hydroxytryptophan into the neurotransmitters dopamine and serotonin. These neurotransmitters are crucial for the normal functioning of the brain, and AADC deficiency leads to severe neurological disorders, including motor dysfunction, autonomic nervous system dysfunction, and behavioral abnormalities.
HDC catalyzes the conversion of histidine to histamine. Histamine is an important mediator in allergic and inflammatory reactions, and a deficiency in HDC is closely related to immune dysfunction and allergic symptoms. For example, in some chronic inflammation and allergic reactions, the upregulation of HDC plays a crucial role in regulating histamine levels and immune cell function.
SAMDC is a key enzyme in the polyamine biosynthetic pathway, responsible for converting S-adenosylmethionine into decarboxylated S-adenosylmethionine, a precursor for the synthesis of spermidine and spermine. These polyamines play vital roles in cell growth, differentiation, and proliferation. The activity of SAMDC is closely related to the cellular concentration of polyamines, and SAMDC inhibitors are widely studied for anticancer and antiparasitic treatments.
Inhibitors targeting amino acid decarboxylases have potential applications in cancer and parasitic disease research. For example, since the polyamine biosynthetic pathway is upregulated in many tumors, SAMDC inhibitors can be used in cancer research, and SAMDC inhibitors are also important tools in antiparasitic research^[1][2][3][4].