Enables glycogen debranching enzyme activity; polysaccharide binding activity; and polyubiquitin modification-dependent protein binding activity. Acts upstream of or within glycogen metabolic process. Located in cytoplasm; inclusion body; and nucleus. Is expressed in several structures, including alimentary system; central nervous system; heart; musculature; and sensory organ. Used to study glycogen storage disease III. Human ortholog(s) of this gene implicated in glycogen storage disease III. Orthologous to human AGL (amylo-alpha-1, 6-glucosidase, 4-alpha-glucanotransferase). [provided by Alliance of Genome Resources, Apr 2022]