本酶催化的反应为Eliminative Cleavage Of Unsaturated Trigalacturonate As The Major Product From The Reducing End Of Polygalacturonic Acid/pectate,系统名称为(1->4)-alpha-D-Galacturonan Reducing-End-Trisaccharide-Lyase,在特异性上与 EC 4.2.2.9 果胶酸二糖裂解酶不同,其主要作用是从还原端去除一个三糖而非二糖。二糖和四糖也可被去除 [2]。