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Cellobiose is a disaccharide with the formula (C 6 H 7 (OH) 4 O) 2 O. It is classified as a reducing sugar - any sugar that possesses the ability or function of a reducing agent. The chemical structure of cellobiose is derived from the condensation of a pair of β-glucose molecules forming a β(1→4) bond.
Structure of xylan in hardwood. [1] Plant cell wall is composed of cellulose, hemicellulose, pectin and glycoproteins. [2] Hemicelluloses (a heterogeneous group of polysaccharides) cross-link glycans interlocking the cellulose fibers and form a mesh like structure to deposit other polysaccharides.
In enzymology, a cellobiose dehydrogenase (acceptor) (EC 1.1.99.18) is an enzyme that catalyzes the chemical reaction cellobiose + acceptor ⇌ {\displaystyle \rightleftharpoons } cellobiono-1,5-lactone + reduced acceptor
This enzyme catalyses the hydrolysis of (1→4)-β-D-glucosidic linkages in cellulose and cellotetraose, releasing cellobiose from the non-reducing ends of the chains. CBH1 from yeast, for example, is composed of a carbohydrate binding site, a linker region and a catalytic domain. [6]
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In enzymology a cellobiose epimerase (EC 5.1.3.11) is an enzyme that catalyzes the chemical reaction cellobiose ⇌ {\displaystyle \rightleftharpoons } D-glucosyl-D-mannose Hence, this enzyme has one substrate , cellobiose , and one product , D-glucosyl-D-mannose .
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