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ENZYME entry: EC

Accepted Name
Oligosaccharide 4-alpha-D-glucosyltransferase.
Alternative Name(s)
Amylase III.
Reaction catalysed
Transfers the non-reducing terminal alpha-D-glucose residue from a (1->4)-alpha-D-glucan to the 4-position of a free glucose or of a glucosyl residue at the non-reducing terminus of a (1->4)-alpha-D-glucan, thus bringing about the rearrangement of oligosaccharides
  • The enzyme acts on amylose, amylopectin, glycogen and maltooligosaccharides.
  • No detectable free glucose is formed, indicating the enzyme does not act as a hydrolase.
  • The enzyme from the bacterium Cellvibrio japonicus has the highest activity with maltotriose as a donor, and also accepts maltose, while the enzyme from amoeba does not accept maltose.
  • Oligosaccharides with 1->6 linkages cannot function as donors, but can act as acceptors.
  • Unlike EC, this enzyme can transfer only a single glucosyl residue.
PRIAM enzyme-specific profiles2.4.1.161
KEGG Ligand Database for Enzyme Nomenclature2.4.1.161
IUBMB Enzyme Nomenclature2.4.1.161
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