Acetylindoxyl oxidase () is an enzyme that catalyzes the chemical reaction N-acetylindoxyl + O2 N-acetylisatin + (?) Thus, the two substrates of this enzyme are N-acetylindoxyl and oxygen, whereas its product is N-acetylisatin. This enzyme belongs to the family of oxidoreductases, specifically those acting on other nitrogenous compounds as donors with oxygen as acceptor. The systematic name of this enzyme class is N-acetylindoxyl:oxygen oxidoreductase. This enzyme participates in tryptophan metabolism. References EC 1.7.3 Enzymes of unknown structure