Tags: Enzyme.
In enzymology a pteridine reductase (EC 1.5.1.33) is an enzyme that catalyzes the chemical reaction5678-tetrahydrobiopterin + 2 NADP+ biopterin + 2 NADPH + 2 H+Thus the two substrates of this enzyme are 5678-tetrahydrobiopterin and NADP+ whereas its 3 products are biopterin NADPH and H+.This enzyme belongs to the family of oxidoreductases specifically those acting on the CH-NH group of donors with NAD+ or NADP+ as acceptor.