KEGG   ENZYME: 3.2.1.155Help
Entry
EC 3.2.1.155                Enzyme                                 

Name
xyloglucan-specific exo-beta-1,4-glucanase;
Cel74A
Class
Hydrolases;
Glycosylases;
Glycosidases, i.e. enzymes that hydrolyse O- and S-glycosyl compounds
BRITE hierarchy
Sysname
[(1->6)-alpha-D-xylo]-(1->4)-beta-D-glucan exo-glucohydrolase
Reaction(IUBMB)
Hydrolysis of (1->4)-D-glucosidic linkages in xyloglucans so as to successively remove oligosaccharides from the chain end.
Comment
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 beta-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 beta-glucan.
History
EC 3.2.1.155 created 2005, withdrawn at public-review stage, modified and reinstated 2006, modified 2011
Orthology
K18578  xyloglucan-specific exo-beta-1,4-glucanase
Genes
NCR: NCU05955
NTE: NEUTE1DRAFT88314(NEUTE1DRAFT_88314)
SMP: SMAC_06979
PAN: PODANSg3079
TTT: THITE_2110055
MTM: MYCTH_116384
CTHR: CTHT_0040730
MGR: MGG_11553
TMN: UCRPA7_4728
FGR: FGSG_11208
ANI: AN5061.2
ANG: ANI_1_236014(An01g01870)
ABP: AGABI1DRAFT51133(AGABI1DRAFT_51133)
ABV: AGABI2DRAFT214617(AGABI2DRAFT_214617)
 » show all
Taxonomy
Reference
1  [PMID:15541296]
  Authors
Grishutin SG, Gusakov AV, Markov AV, Ustinov BB, Semenova MV, Sinitsyn AP.
  Title
Specific xyloglucanases as a new class of polysaccharide-degrading enzymes.
  Journal
Biochim Biophys Acta 1674:268-81 (2004)
DOI:10.1016/j.bbagen.2004.07.001
  Sequence
Other DBs
ExplorEnz - The Enzyme Database: 3.2.1.155
IUBMB Enzyme Nomenclature: 3.2.1.155
ExPASy - ENZYME nomenclature database: 3.2.1.155
BRENDA, the Enzyme Database: 3.2.1.155
CAS: 1000598-79-7

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