Note: 4-hydroxyphenylpyruvate dioxygenase corresponds to EC 1.13.11.27. 4-Hydroxyphenylpyruvate dioxygenase participates in the tyrosine catabolic pathway by catalyzing the conversion of 4-hydroxyphenylpyruvate to homogentisate. A deficiency in this enzyme can result in 4-Hydroxyphenylacetic aciduria.