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Table 1 Enzymes expressed and characterized in T. reesei for the degradation of hemicellulose and cellulose, grouped according to their functionality.

From: The influence of feedstock characteristics on enzyme production in Trichoderma reesei: a review on productivity, gene regulation and secretion profiles

Group Functionality Enzymes in T. reesei EC
Enzymes for the degradation of hemicellulose
 Backbone cleaving enzymes Degradation of the xylan backbone in arabinoxylan (hardwood) and arabinoglucoronoxylan (grasses) by endo- and exo-xylanases Endo-β-1,4-xylanase 3.2.1.8
1,4-β-Xylosidase 3.2.1.37
Xyloglucan-specific endo-β-1,4-glucanase 3.2.1.151
Degradation of the mannan backbone in galactoglucomannan (softwood) by endo- and exo-mannanases Endo-1,4-β-mannosidase 3.2.1.78
β-Mannosidase 3.2.1.25
1,2-α-Mannosidase 3.2.1.113
β-Galactosidase 3.2.1.23
 Side-chain cleaving hydrolytic enzymes Cleaving off galactose moieties from galactoglucomannan (softwood) α-Galactosidase 3.2.1.22
Cleaving off arabinose moieties from arabinoxylan (hardwood) and arabinoglucoronoxylan (grasses) α-l-Arabinofuranosidase 3.2.1.55
Cleaving off glucoronic moieties from arabinoxylan (hardwood) and arabinoglucoronoxylan (grasses) α-Glucuronidase 3.2.1.139
 Side chain cleaving esterases Cleaving off acetyl groups from glucuronoxylan (hardwood), arabinoglucoronoxylan (grasses), and galactoglucomannan (softwood) Acetyl xylan esterase 3.1.1.72
Cleaving ester linkage between arabinose in hemicellulose and ferulic acid in lignin Acetyl esterase 3.1.1.6
Enzymes for degradation of cellulose
 Concerted action of exo- and endo-cellulases and β-glucosidase Endo-β-1,4-glucanase 3.2.1.4
1,4-β-Cellobiosidase 3.2.1.91
β-Glucosidase 3.2.1.21
 Auxiliary activities Cleavage of cellulose chains by oxidation of C1 or C4 Lytic polysaccharide monooxygenases 1.14.99.56
 Non-hydrolytic proteins High binding affinity for hemicellulose and cellulose, unknown role in biomass degradation Swollenin