The calpain system,which consists of calpain,calpastatin and calpain activator,is very complicated.The paper reviews the structure and functions of calpain system.

• 钙蛋白酶系统是高度可调的复杂系统,包括钙激活酶、钙激活酶抑制蛋白和钙激活酶激活蛋白,三者相互作用,共同调控宰后肉的嫩化。