本酶催化的反应为Hydrolysis Of beta-L-Arap-(1->3)-L-Araf Disaccharides From Non-Reducing Terminals In Branches Of Type II Arabinogalactan Attached To Proteins.系统名称为Type II Arabinogalactan Exo alpha-(1,3)-[beta-L-Arabinopyranosyl-(1->3)-L-Arabinofuranose] Hydrolase (Non-Reducing End),该酶从细菌 Bifidobacterium pseudocatenulatum 中鉴定,以外切作用方式特异性水解阿拉伯半乳聚糖非还原端的 beta-L-Arap-(1->3)-L-Araf 二糖。它对含有 II 型阿拉伯半乳聚糖的阿拉伯半乳聚糖-蛋白(AGP)有活性,如阿拉伯胶 AGP 和落叶松 AGP。该酶还可以低得多的活性水解 alpha-D-Galp-(1->3)-L-Araf 二糖(参见 EC 3.2.1.215)。