Reaction: Hydrolysis of terminal, non-reducing β-D-galactose residues in (1→2)-β-D-galactooligosaccharides.
Other name(s): β-1,2-galactosidase
Systematic name: galactooligosaccharide exo β-(1,2)-D-galactopyranosidase (non-reducing end)
Comments: The enzyme, characterized from the bacterium Bacteroides xylanisolvens, specifically hydrolyses β-(1,2)-galactopyranosidic bond at the non-reducing end of (1→2)-β-galactooligosaccharides. cf. EC 3.2.1.23, β-galactosidase; EC 3.2.1.108, lactase, and EC 3.2.1.145, galactan 1,3-β-galactosidase.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number:
References:
1. Nakazawa, Y., Kageyama, M., Matsuzawa, T., Liang, Z., Kobayashi, K., Shimizu, H., Maeda, K., Masuhiro, M., Motouchi, S., Kumano, S., Tanaka, N., Kuramochi, K., Nakai, H., Taguchi, H. and Nakajima, M. Structure and function of a β-1,2-galactosidase from Bacteroides xylanisolvens, an intestinal bacterium. Commun Biol 8 (2025) 66. [PMID: 39820076]