“…To date, four fungal endo-β-1,4-galactanases from the following sources have been structurally and biochemically characterized: Thermothelomyces thermophila (also known as Myceliophthora thermophila ) (MtGal, GenBank ID AAE73520.1, PDB IDs: 1HJS, 1HJU) [ 16 ], Humicola insolens (HiGal, GenBank ID AAN99815.1, PDB ID: 1HJQ) [ 16 ], Aspergillus aculeatus KSM 510 (AaGal, GenBank ID AAA32692.1, PDB IDs: 1FHL, 1FOB) [ 17 ] and the highly related Aspergillus nidulans FGSC A4 (EnGal, GenBank ID ABF50874.1, PDB ID: 4BF7) [ 18 ]. Two bacterial endo-β-1,4-galactanase have also been structurally characterized, one from Bacillus licheniformis (BlGal, GenBank ID AAO31370.1, PDB IDs: 1R8L, 1UR0, 1UR4, 2CCR, 2GFT, 2J74) [ 19 , 20 ], and one from Bacteroides thetaiotaomicron (BtGal, GenBank ID AAO79773.1, PDB IDs: 6GP5, 6GPA) [ 21 ]. The fungal galactanases mentioned above as well as BtGal can degrade the galactan substrate down to galactobiose [ 15 , 20 , 21 ].…”