5.4.3.6 L-Tyr formation of beta-Tyr which is the N-terminal amino acid of the antibiotic edeine 5.4.3.6 L-tyrosine involved in the biosynthesis of the enediyne antitumor antibiotic C-1027 5.4.3.6 L-tyrosine - 5.4.3.6 L-tyrosine Oryza sativa enzyme OsTAM makes 75% beta-tyrosine and 25% 4-coumarate from alpha-tyrosine