Xyloglucan-specific exo-beta-1,4-glucanase
      
In enzymology, a xyloglucan-specific exo-beta-1,4-glucanase (EC 3.2.1.155) is an enzyme that catalyzes the chemical reaction
- xyloglucan + H2O 
 xyloglucan oligosaccharides (exohydrolysis of 1,4-beta-D-glucosidic linkages in xyloglucan) 
Thus, the two substrates of this enzyme are xyloglucan and H2O, and its products are xyloglucan oligosaccharides (exohydrolysis of 1,4-beta-D-glucosidic linkages in xyloglucan).
This enzyme belongs to the family of hydrolases, specifically those glycosidases that hydrolyse O- and S-glycosyl compounds.  The systematic name of this enzyme class is [(1->6)-alpha-D-xylo]-(1->4)-beta-D-glucan exo-glucohydrolase. This enzyme is also called Cel74A.
References
-  Sinitsyn AP; Gusakov, AV; Markov, AV; Ustinov, BB; Semenova, MV; Sinitsyn, AP (2004). "Specific xyloglucanases as a new class of polysaccharide-degrading enzymes". Biochim. Biophys. Acta 1674 (3): 268–81. doi:10.1016/j.bbagen.2004.07.001. PMID 15541296. 
 
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