EC 188.8.131.52 - Xyloglucan-specific exo-β-1,4-glucanase
IntEnz Enzyme Nomenclature
- Hydrolysis of (1→4)-D-glucosidic linkages in xyloglucans so as to successively remove oligosaccharides from the chain end.
The enzyme removes XXXG heptasaccharides, XXLG/XLXG octasaccharides and XLLG nonasaccharides from the end of tamarind seed xyloglucan polymers in a processive manner. Hydrolysis occurs at the unsubstituted D-glucopyranose residue in the main backbone. It is not known whether the cleavage takes place at the reducing or non-reducing end of the polymer. Very low activity with β-D-glucans. The enzyme from Chrysosporium lucknowense shifts to an endoglucanase mode when acting on linear substrates without bulky substituents on the polymeric backbone such as barley β-glucan. Formerly EC 184.108.40.206.
Links to other databases
Specific xyloglucanases as a new class of polysaccharide-degrading enzymes.Biochim. Biophys. Acta 1674: 268-281 (2004). [PMID: 15541296]
[EC 220.127.116.11 created 2005, withdrawn at public-review stage, modified and reinstated 2006, modified 2011]