Enzymatic reactions [BR:br08201]
1. Oxidoreductase reactions
1.14 Acting on paired donors, with incorporation or reduction of molecular oxygen
1.14.16 With reduced pteridine as one donor, and incorporation of one atom of oxygen into the other donor
1.14.16.1
R12540 L-Phenylalanine + Tetrahydropteridine + Oxygen <=> L-Tyrosine + 4a-Hydroxy-5,6,7,8-tetrahydropteridine
