Phenylalanine--tRNA ligase alpha subunit
L-Phenylalanine + Oxoglutaric acid ↔ L-Glutamic acid + Phenylpyruvic acid
L-Tyrosine + Oxoglutaric acid ↔ 4-Hydroxyphenylpyruvic acid + L-Glutamic acid
Adenosine triphosphate + L-Tyrosine + tRNA(Tyr) → Adenosine monophosphate + L-Tyrosyl-tRNA(Tyr) + Pyrophosphate
Adenosine triphosphate + L-Phenylalanine + tRNA(Phe) → Adenosine monophosphate + L-Phenylalanyl-tRNA(Phe) + Pyrophosphate
Maleylacetoacetic acid → 4-Fumarylacetoacetic acid
4-Fumarylacetoacetic acid + Water → Acetoacetic acid + Fumaric acid
L-Phenylalanine + Oxygen + Water → Ammonia + Hydrogen peroxide + Phenylpyruvic acid
Homogentisic acid + Oxygen → Maleylacetoacetic acid
L-Tyrosine + Oxygen + Water → 4-Hydroxyphenylpyruvic acid + Ammonia + Hydrogen peroxide
4-Hydroxyphenylpyruvic acid + Oxygen → Carbon dioxide + Homogentisic acid
L-Phenylalanine + L-erythro-tetrahydrobiopterin + Oxygen → 4a-Hydroxytetrahydrobiopterin + L-Tyrosine