IUBMB Enzyme Nomenclature


Accepted name: glucan 1,6-α-isomaltosidase

Reaction: Hydrolysis of (1→6)-α-D-glucosidic linkages in polysaccharides, to remove successive isomaltose units from the non-reducing ends of the chains

Other name(s): exo-isomaltohydrolase; isomalto-dextranase; isomaltodextranase; G2-dextranase; 1,6-α-D-glucan isomaltohydrolase

Systematic name: 6-α-D-glucan isomaltohydrolase

Comments: Optimum activity is on those 1,6-α-D-glucans containing 6, 7 and 8 glucose units; those containing 3, 4 and 5 glucose units are hydrolysed at slower rates.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 56467-68-6


1. Sawai, T., Toriyama, K. and Yano, K. A bacterial dextranase releasing only isomaltose from dextrans. J. Biochem. (Tokyo) 75 (1974) 105-112. [PMID: 4826536]

2. Sawai, T. and Niwa, Y. Transisomaltosylation activity of a bacterial isomaltodextranase. Agric. Biol. Chem. 39 (1975) 1077-1083.

[EC created 1976]

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