The Enzyme Database

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Accepted name: galactan exo-1,6-β-galactobiohydrolase (non-reducing end)
Reaction: Hydrolysis of (1→6)-β-D-galactosidic linkages in arabinogalactan proteins and (1→3):(1→6)-β-galactans to yield (1→6)-β-galactobiose as the final product.
Other name(s): exo-β-1,6-galactobiohydrolase; 1,6Gal (gene name)
Systematic name: exo-β-(1→6)-galactobiohydrolase (non-reducing end)
Comments: The enzyme, characterized from the bacterium Bifidobacterium longum, specifically hydrolyses (1→6)-β-galactobiose from the non-reducing terminal of (1→6)-β-D-galactooligosaccharides with a degree of polymerization (DP) of 3 or higher, using an exo mode of action. The enzyme cannot hydrolyse α-L-arabinofuranosylated (1→6)-β-galactans (as found in arabinogalactans) and does not act on (1→3)-β-D- or (1→4)-β-D-galactans. cf. EC, galactan endo-1,6-β-galactosidase.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
1.  Fujita, K., Sakamoto, A., Kaneko, S., Kotake, T., Tsumuraya, Y. and Kitahara, K. Degradative enzymes for type II arabinogalactan side chains in Bifidobacterium longum subsp. longum. Appl. Microbiol. Biotechnol. 103 (2019) 1299–1310. [PMID: 30564851]
[EC created 2020]

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