2.1.1.304 physiological function the enzyme is involved in biosynthesis of saframycin A, a potent antitumor antibiotic that belongs to the tetrahydroisoquinoline family -, 725507 2.1.1.304 physiological function the enzyme is involved in the biosynthesis of 3'-methyltyrosine, which is the precursor of the tetrahydroisoquinoline moiety in Safracin (antibiotic) 756470 2.1.1.304 physiological function the enzyme is involved in the biosynthesis of 3'-methyltyrosine, which is the precursor of the tetrahydroisoquinoline moiety in Saframycin (antibiotic) 756470