本酶催化的反应为Hydrolysis Of (1->4)-D-Glucosidic Linkages In Xyloglucans So As To Successively Remove Oligosaccharides From The Newly-Formed Chain End After Endo-Initiation On A Polymer Molecule,系统名称为[(1->6)-alpha-D-Xylo]-(1->4)-beta-D-Glucan Endo-Processive Glucohydrolase,该酶在对多糖进行初始内切型攻击后,以过程性方式从木葡聚糖分子上去除支链寡糖,这些寡糖的主链优选含有四个葡糖残基[1-5]。水解发生在主链中未被取代的D-吡喃葡糖残基和/或带有木糖基的D-吡喃葡糖残基处[1-5]。该酶对其他β-D-葡聚糖没有活性或活性极低[1,2,4,5]。