In enzymology, a prenylcysteine oxidase () is an enzyme that catalyzes the chemical reaction an S-prenyl-L-cysteine + O2 + H2O a prenal + L-cysteine + H2O2 The 3 substrates of this enzyme are S-prenyl-L-cysteine, O2, and H2O, whereas its 3 products are prenal, L-cysteine, and H2O2. This enzyme belongs to the family of oxidoreductases, specifically those acting on a sulfur group of donors with oxygen as acceptor. The systematic name of this enzyme class is S-prenyl-L-cysteine:oxygen oxidoreductase. This enzyme is also called prenylcysteine lyase. Human protein and gene Prenylcysteine oxidase 1, symbol PCYOX1, gene on chromosome 2 See also Hemithioacetals in nature, for mechanism of action Flavin adenine dinucleotide, cofactor of the enzyme Prenylation, a process forming S-prenyl-L-cysteine References EC 1.8.3 Enzymes of unknown structure