Table 2.

Classification of hemicellulases in the glycoside hydrolase families

Hemicellulase	Substrates	EC	Glycoside hydrolase family	Protein structure and PDB accession number
Xylanase	β-xylan	3.2.1.8	5, 6, 8, 10, 11, 26, 30, 43, 51, 98, 141	3HD8, 1NOF, 2B42, etc
β-Xylosidase	Xylooligosaccharides/xylobiose	3.2.1.37	1, 2, 3, 5, 8, 10, 30, 39, 43, 51, 52, 54, 116, 120	3VSU, 7VC7, 4C1O, etc
Mannase	β-Mannan	3.2.1.78	5, 26, 113,134	1RH9
Endo-α-1,5-arabinanase	α-1,5-Arabinan	3.2.1.99	43	2X8T, 1UV4, 6F1G, etc
β-mannosidase	Mannan-oligosaccharide, mannobiose	3.2.1.25	1, 2, 5, 113, 164	6DDT, 4LYQ, 4NRS, etc
α-galactosidase	α-1,6-Galactosyl-mannan-oligosaccharide	3.2.1.22	4, 27, 31, 36,57, 97, 110	1T0O, 3MI6, 4FNR, etc
Galactanase	β-Galactan	3.2.1.89	53, 147	6Q3R, 7OSK, 4BF7, etc
β-glucosidase	β-1,4-glucomannan	3.2.1.21	1, 2, 3, 5, 16, 30, 39, 116, 131, 175, 180	3VIK, 815P, 8I5P, etc
α-l-Arabinofuranosidase	Arabinoxylo-(α-1,2 or α-1,3)-oligosaccharides, α-1,5-arabinan	3.2.1.55	2, 3, 5, 10, 43, 51, 54, 62, 159	1WD3, 1QW9, 2C8N, etc
α-Glucuronidase	4-O-methyl-α-glucuronyl-xylan	3.2.1.139	67, 115	1K9E, 1MQR, 4C9O, etc