Glucan 1,6-alpha-isomaltosidase

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Glucan 1,6-alpha-isomaltosidase (EC 3.2.1.94, exo-isomaltohydrolase, isomalto-dextranase, isomaltodextranase, G2-dextranase, 1,6-alpha-D-glucan isomaltohydrolase) is an enzyme with systematic name 6-alpha-D-glucan isomaltohydrolase.^[1]^[2] This enzyme catalyses the following chemical reaction

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

Optimum activity is on those 1,6-alpha-D-glucans containing 6, 7 and 8 glucose units.

References

↑ Sawai, T., Toriyama, K. and Yano, K. (1974). "A bacterial dextranase releasing only isomaltose from dextrans". J. Biochem. (Tokyo) 75: 105–112. PMID 4826536.
↑ Sawai, T. and Niwa, Y. (1975). "Transisomaltosylation activity of a bacterial isomaltodextranase". Agric. Biol. Chem. 39: 1077–1083. doi:10.1271/bbb1961.39.1077.

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Glucan 1,6-alpha-isomaltosidase at the US National Library of Medicine Medical Subject Headings (MeSH)

Hydrolase: sugar hydrolases (EC 3.2)

3.2.1: Glycoside hydrolases

Disaccharidase	Sucrase/Sucrase-isomaltase/Invertase Maltase Trehalase Lactase

Glucosidases	Cellulase Alpha-glucosidase Acid Neutral AB Neutral C Beta-glucosidase cytosolic Debranching enzyme

Other	Amylase Alpha-amylase Chitinase Lysozyme Neuraminidase NEU1 NEU2 NEU3 NEU4 Bacterial neuraminidase Viral neuraminidase Galactosidases Alpha Beta alpha-Mannosidase Glucuronidase Hyaluronidase Pullulanase Glucosylceramidase lysosomal non-lysosomal Galactosylceramidase Alpha-N-acetylgalactosaminidase NAGA Alpha-N-acetylglucosaminidase Fucosidase Hexosaminidase HEXA HEXB Iduronidase Maltase-glucoamylase Heparanase HPSE2

3.2.2: Hydrolysing
N-Glycosyl compounds

DNA glycosylases: Oxoguanine glycosylase

Enzymes

Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Catalytically perfect enzyme Coenzyme Cofactor Enzyme catalysis Enzyme kinetics Lineweaver–Burk plot Michaelis–Menten kinetics

Regulation	Allosteric regulation Cooperativity Enzyme inhibitor

Classification	EC number Enzyme superfamily Enzyme family List of enzymes

Types	EC1 Oxidoreductases(list) EC2 Transferases(list) EC3 Hydrolases(list) EC4 Lyases(list) EC5 Isomerases(list) EC6 Ligases(list)

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