6,7-dihydropteridine reductase

In enzymology, a 6,7-dihydropteridine reductase is an enzyme that catalyzes the chemical reaction


 * a 5,6,7,8-tetrahydropteridine + NAD(P)+ $$\rightleftharpoons$$ a 6,7-dihydropteridine + NAD(P)H + H+

The 3 substrates of this enzyme are 5,6,7,8-tetrahydropteridine, NAD+, and NADP+, whereas its 4 products are 6,7-dihydropteridine, NADH, 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. The systematic name of this enzyme class is 5,6,7,8-tetrahydropteridine:NAD(P)+ oxidoreductase. Other names in common use include 6,7-dihydropteridine:NAD(P)H oxidoreductase, DHPR, NAD(P)H:6,7-dihydropteridine oxidoreductase, NADH-dihydropteridine reductase, NADPH-dihydropteridine reductase, NADPH-specific dihydropteridine reductase, dihydropteridine (reduced nicotinamide adenine dinucleotide), reductase, dihydropteridine reductase, dihydropteridine reductase (NADH), and 5,6,7,8-tetrahydropteridine:NAD(P)H+ oxidoreductase. This enzyme participates in folate biosynthesis.

Structural studies
As of late 2007, 3 structures have been solved for this class of enzymes, with PDB accession codes, , and.