In enzymology, a diferric-transferrin reductase () is an enzyme that catalyzes the chemical reaction transferrin[Fe(II)]2 + NAD+ + H+ transferrin[Fe(III)]2 + NADH The 3 substrates of this enzyme are [[transferrin[Fe(II)]2]], NAD+, and H+, whereas its two products are [[transferrin[Fe(III)]2]] and NADH. This enzyme belongs to the family of oxidoreductases, specifically those oxidizing metal ion with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is transferrin[Fe(II)]2:NAD+ oxidoreductase. Other names in common use include diferric transferrin reductase, NADH diferric transferrin reductase, and transferrin reductase. This enzyme participates in porphyrin and chlorophyll metabolism. Structural studies As of late 2007, only one structure has been solved for this class of enzymes, with the PDB accession code . References EC 1.16.1 NADH-dependent enzymes Enzymes of known structure Transferrins