The baby is unable to make an enzyme, phenylalanine hydroxylase, which converts phenylalanine hydroxylase, which converts phenylalanine to tyrosine.
Classical PKU is caused by a deficiency of the liver enzyme phenylalanine hydroxylase, which converts the amino acid phenylalanine to tyrosine.
Tyrosine is converted into DOPA by the enzyme tyrosine is converted into DOPA by the enzyme tyrosine hydroxylase.
It performs the conversion by an enzyme called tryptophan hydroxylase.
Tyrosine is converted into DOPA by the enzyme tyrosine hydroxylase.