This is the C-terminal domain of the glycogen debranching enzyme GlgX. GlgX hydrolyzes alpha-1,6-glycosidic linkages of phosphorylase-limit dextrin containing only three or four glucose subunits produced by glycogen phosphorylase. Sequence analysis suggests that GlgX is a debranching enzyme belonging to the glycoside hydrolase GH-13 family in the CAZy database [1].

1: Structural rationale for the short branched substrate specificity of the glycogen debranching enzyme GlgX. Song HN, Jung TY, Park JT, Park BC, Myung PK, Boos W, Woo EJ, Park KH; Proteins. 2010;78:1847-1855. PMID:20187119