Phenylalanine hydroxylase
Mammalian protein found in Homo sapiens / From Wikipedia, the free encyclopedia
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Phenylalanine hydroxylase (PAH) (EC 1.14.16.1) is an enzyme that catalyzes the hydroxylation of the aromatic side-chain of phenylalanine to generate tyrosine. PAH is one of three members of the biopterin-dependent aromatic amino acid hydroxylases, a class of monooxygenase that uses tetrahydrobiopterin (BH4, a pteridine cofactor) and a non-heme iron for catalysis. During the reaction, molecular oxygen is heterolytically cleaved with sequential incorporation of one oxygen atom into BH4 and phenylalanine substrate.[5][6] In humans, mutations in its encoding gene, PAH, can lead to the metabolic disorder phenylketonuria.
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