Blood-group-substance endo-1,4-beta-galactosidase

Blood-group-substance endo-1,4-β-galactosidase (, endo-β-galactosidase, blood-group-substance 1,4-β- D -galactanohydrolase) is an enzyme with systematic name blood-group-substance 4-β- D -galactanohydrolase. It catalyses endohydrolysis of (1→4)-β- D -galactosidic linkages in blood group A and B substances.

It hydrolyses the 1,4-β- D -galactosyl linkages adjacent to a 1,3-α- D -galactosyl or N-acetylgalactosaminyl residues and a 1,2-α- D -fucosyl residue.