The green tea gallocatechins, (-)-epigallocatechin-3-O-gallate (EGCG), and (-)-epigallocatechin (EGC) were found to be inhibitors of Dopa decarboxylase (DDC). EGCG and EGC inactivate the enzyme in both a time- and concentration-dependent manner and exhibit saturation of the rate of inactivation at
Histidine decarboxylase (HDC) and l-aromatic amino acid decarboxylase (DDC) are homologous enzymes that are responsible for the synthesis of important neuroactive amines related to inflammatory, neurodegenerative, and neoplastic diseases. Epigallocatechin-3-gallate (EGCG), the most abundant catechin
(-)-epigallocatechin-3-gallate, an antiproliferative and antiangiogenic component of green tea, has been reported to inhibit dopa decarboxylase. In this report,we show that this compound also inhibits histidine decarboxylase, the enzymic activity responsible for histamine biosynthesis. This
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