ExplorEnz: EC 2.4.1.387

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2.4.1.387

Accepted name:

isomaltosyltransferase

Reaction:

(1) 2 α-isomaltosyl-(1→4)-maltotriose = α-isomaltosyl-(1→3)-α-isomaltosyl-(1→4)-maltotriose + maltotriose
(2) α-isomaltosyl-(1→3)-α-isomaltosyl-(1→4)-maltotriose = cyclobis-(1→6)-α-nigerosyl + maltotriose

Systematic name:

α-isomaltosyl-(1→3)-1,4-α-D-glucan:1,4-α-D-glucan 3-α-isomaltosyltransferase

Comments:

The enzyme, found in bacteria that produce cyclobis-(1→6)-α-nigerosyl, acts on the products of EC 2.4.1.24, 1,4-α-glucan 6-α;-glucosyltransferase. It catalyses the α-(1→3) transfer of the isomaltosyl moiety of one substrate to another, resulting in α-isomaltosyl-(1→3)-α-isomaltosyl-α-(1→4)-glucan formation. In addition, the enzyme catalyses the intramolecular cyclization of the product, eventually generating cyclobis-(1→6)-α-nigerosyl.

Links to other databases:

BRENDA, EXPASY, KEGG, MetaCyc

References:

1.	Aga, H., Maruta, K., Yamamoto, T., Kubota, M., Fukuda, S., Kurimoto, M. and Tsujisaka, Y. Cloning and sequencing of the genes encoding cyclic tetrasaccharide-synthesizing enzymes from Bacillus globisporus C11. Biosci. Biotechnol. Biochem. 66 (2002) 1057–1068. [DOI] [PMID: 12092816]
2.	Nishimoto, T., Aga, H., Mukai, K., Hashimoto, T., Watanabe, H., Kubota, M., Fukuda, S., Kurimoto, M. and Tsujisaka, Y. Purification and characterization of glucosyltransferase and glucanotransferase involved in the production of cyclic tetrasaccharide in Bacillus globisporus C11. Biosci. Biotechnol. Biochem. 66 (2002) 1806–1818. [DOI] [PMID: 12400677]
3.	Kim, Y.K., Kitaoka, M., Hayashi, K., Kim, C.H. and Cote, G.L. A synergistic reaction mechanism of a cycloalternan-forming enzyme and a D-glucosyltransferase for the production of cycloalternan in Bacillus sp. NRRL B-21195. Carbohydr. Res. 338 (2003) 2213–2220. [DOI] [PMID: 14553982]

[EC 2.4.1.387 created 2022]