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In enzymology, a 5-amino-6-(5-phosphoribosylamino)uracil reductase (EC 1.1.1.193) is an enzyme that catalyzes the chemical reaction

5-amino-6-(5-phosphoribitylamino)uracil + NADP+






{\displaystyle \rightleftharpoons }
5-amino-6-(5-phosphoribosylamino)uracil + NADPH + H+Thus, the two substrates of this enzyme are 5-amino-6-(5-phosphoribitylamino)uracil and NADP+, whereas its 3 products are 5-amino-6-(5-phosphoribosylamino)uracil, NADPH, and H+.
This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is 5-amino-6-(5-phosphoribitylamino)uracil:NADP+ 1'-oxidoreductase. This enzyme is also called aminodioxyphosphoribosylaminopyrimidine reductase. This enzyme participates in riboflavin metabolism.

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