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Information on EC 2.4.1.387 - isomaltosyltransferase

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EC Tree
     2 Transferases
         2.4 Glycosyltransferases
             2.4.1 Hexosyltransferases
                2.4.1.387 isomaltosyltransferase
IUBMB Comments
The enzyme, found in bacteria that produce cyclobis-(1->6)-alpha-nigerosyl, acts on the products of EC 2.4.1.24, 1,4-alpha-glucan 6-alpha;-glucosyltransferase. It catalyses the alpha-(1->3) transfer of the isomaltosyl moiety of one substrate to another, resulting in alpha-isomaltosyl-(1->3)-alpha-isomaltosyl-alpha-(1->4)-glucan formation. In addition, the enzyme catalyses the intramolecular cyclization of the product, eventually generating cyclobis-(1->6)-alpha-nigerosyl.
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The expected taxonomic range for this enzyme is: Sporosarcina globispora
Reaction Schemes
2
alpha-isomaltosyl-(1->4)-maltotriose
=
alpha-isomaltosyl-(1->3)-alpha-isomaltosyl-(1->4)-maltotriose
+
Synonyms
alternanase, 3-alpha-isomaltosyltransferase, isomaltosyltransferase, isomaltosyl transferase, cycloalternan-forming enzyme, more
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
2 alpha-isomaltosyl-(1->4)-maltotriose = alpha-isomaltosyl-(1->3)-alpha-isomaltosyl-(1->4)-maltotriose + maltotriose
show the reaction diagram
(1)
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alpha-isomaltosyl-(1->3)-alpha-isomaltosyl-(1->4)-maltotriose = cyclobis-(1->6)-alpha-nigerosyl + maltotriose
show the reaction diagram
(2)
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PATHWAY SOURCE
PATHWAYS
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