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Why is the enzyme dihydropteridine reductase needed for the conversion of phenylalanine to tyrosine?

April 26, 2017conversion enzyme needed phenylalanine reductase tyrosine

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Why is the enzyme dihydropteridine reductase needed for the conversion of phenylalanine to tyrosine?

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=> During the conversion reaction, the cofactor is co-oxidized to the quinonoid form. Dihydropteridine reductase is needed to reduce this and regenerate the tetrahydrobiopterin, so that the conversion reaction can continue.