Virulence factor (By similarity). Involved in the degradation of glycogen of the mammalian host cells. Hydrolyzes the alpha-1,6-branchpoints of glycogen (By similarity). Hydrolyzes pullulan (PubMed:11083842). Does not hydrolyze dextran. Binds to mouse lung alveolar type II cells that are rich in glycogen stores. Is an alpha-glucan-specific carbohydrate-binding protein, which binds to amylose (pure alpha-(1,4)-linked glucose), amylopectin (alpha-(1,4)-linked glucose with alpha-(1,6) branch points), pullulan (linear polymer of mixed alpha-(1,4)- and alpha-(1,6)-linked glucose) and glycogen (similar to amylopectin with more frequent alpha-(1,6) branch points) in vitro. Does not bind to dextran (a linear polymer of alpha-(1,6)-linked glucose) (By similarity). Hydrolysis of (1->6)-alpha-D-glucosidic linkages in pullulan, amylopectin and glycogen, and in the alpha- and beta-limit dextrins of amylopectin and glycogen. Inhibited by 4-O-alpha-D-glucopyranosylmoranoline (G1M). Localizes to cytoplasm in the lung alveolar type II cells of the mouse and human hosts. The N-terminal tandem family 41 carbohydrate-binding modules (CBM) are involved in carbohydrate binding. The C-terminal glycosyl hydrolase 13 (GH13) domain is involved in catalysis. Belongs to the glycosyl hydrolase 13 family.