Dopamine (DA) in the cytosol is methylated to 3-methoxytyramine (3MT) by catecholamine O-methyltransferase (COMT), which uses s-adenosylmethionine (AdoMet) as a methyl group donor (Männistö & Kaakkola 1991, Westerink & Spaan 1989).
Beaulieu, JM, Gainetdinov, RR, Caron, MG, Salahpour, A, Zhang, X, Barak, LS, Espinoza, S, Sotnikova, TD, Masri, B
methyltransferase activity of COMT [plasma membrane]
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