Claim: PreQ1 synthase has two substrates (typically the chemical species being observed in a chemical reaction) and the enzyme belongs to the family of oxidoreductases.
Evidence: 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. In chemistry, a substrate is typically the chemical species being observed in a chemical reaction, which reacts with a reagent to generate a product. This enzyme belongs to the family of oxidoreductases, specifically those acting on other nitrogenous compounds as donors with NAD+ or NADP+ as acceptor.