Claim: PreQ1 synthase has two substrates and the enzyme belongs to the family of oxidoreductases.
Evidence: In enzymology, a preQ1 synthase (EC ) is an enzyme that catalyzes the chemical reaction Thus, the two substrates of this enzyme are 7-aminomethyl-7-carbaguanine and NADP, whereas its 3 products are 7-cyano-7-carbaguanine, NADPH, and H. This enzyme belongs to the family of oxidoreductases, specifically those acting on other nitrogenous compounds as donors with NAD+ or NADP+ as acceptor.