Arabinogalactan endo-ò-1,4-galactanase (, endo-1,4-ò-galactanase, galactanase, arabinogalactanase, ganB (gene)) is an enzyme with systematic name arabinogalactan 4-ò-<small>D</small>-galactanohydrolase. It specifically catalyses the hydrolysis (1âÂÂ4)-ò-<small>D</small>-galactosidic linkages in type I arabinogalactans.
It is isolated from the bacterium Bacillus subtilis.