Information on EC - cycloisomaltooligosaccharide glucanotransferase

for references in articles please use BRENDA:EC2.4.1.248
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EC Tree
     2 Transferases
         2.4 Glycosyltransferases
             2.4.1 Hexosyltransferases
       cycloisomaltooligosaccharide glucanotransferase
IUBMB Comments
Specific for (1->6)-alpha-D-glucans (dextrans) and, unlike cyclomaltodextrin glucanotransferase (EC, without activity towards (1->4)-alpha-D-glucans, such as amylose. It also has no activity on oligosaccharides, such as amylopectin and pullulan, containing (1->6)-alpha-D-glucosidic linkages at branch points. The enzyme from Bacillus circulans T-3040 has been shown to form cycloisomalto-oligosaccharides of three sizes (7, 8 and 9 glucose units). It will also catalyse the disproportionation of two isomalto-oligosaccharides molecules to yield a series of isomalto-oligosachharides and the addition of D-glucose to cycloisomalto-oligosaccharides with ring opening to form isomalto-oligosaccharides.
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Word Map
The enzyme appears in viruses and cellular organisms
Reaction Schemes
cyclizes part of a (1->6)-alpha-D-glucan chain by formation of a (1->6)-alpha-D-glucosidic bond
cit, CITase, CITase-598K, CITase-T3040, isocyclomaltooligosaccharide glucanotransferase, more
cyclizes part of a (1->6)-alpha-D-glucan chain by formation of a (1->6)-alpha-D-glucosidic bond
show the reaction diagram
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