In enzymology, an alliin lyase (EC 4.4.1.4) is an enzyme that catalyzes the chemical reaction 蒜胺酸酶是洋蔥令人流淚的原因。只要切洋蔥時不要把根切開就可以了。甄文達。 an S-alkyl-L-cysteine S-oxide an alkyl sulfenate + 2-aminoacrylate Hence, this enzyme has one substrate, S-alkyl-L-cysteine S-oxide, and two products, alkyl sulfenate and 2-aminoacrylate. Many alliinases contain a novel N-terminal epidermal growth factor-like domain (EGF-like domain).