Glycoside hydrolases are a widespread group of enzymes that hydrolyse the glycosidic bond between two or more carbohydrates, or between a carbohydrate and a non-carbohydrate moiety. More than 100 different families of glycoside hydrolases have been defined based on sequence similarity. Glycosyl hydrolase family 63 is a family of eukaryotic enzymes that catalyse the specific cleavage of the non-reducing terminal glucose residue from Glc(3)Man(9)GlcNAc(2).

This entry corresponds to the N-terminal domain of this family of proteins, its specific function remains unknown.