 Cyanocobalamin reductase (cyanide-eliminating)

In enzymology, a cyanocobalamin reductase (cyanide-eliminating) () is an enzyme that catalyzes the chemical reaction

The 3 substrates of this enzyme are cob(I)alamin, cyanide, and NADP+, whereas its 3 products are cyanocob(III)alamin, NADPH, and H+.This enzyme belongs to the family of oxidoreductases, specifically those that oxidize metal ions and use NAD+ or NADP+ as an electron acceptor (for that oxidization reaction).