IUBMB Enzyme Nomenclature


Accepted name: alternansucrase

Reaction: Transfers alternately an α-D-glucosyl residue from sucrose to the 6-position and the 3-position of the non-reducing terminal residue of an α-D-glucan, thus producing a glucan having alternating (1→6)-α- and (1→3)-α-linkages

Other name(s): sucrose-1,6(3)-α-glucan 6(3)-α-glucosyltransferase; sucrose:1,6-, 1,3-α-D-glucan 3-α- and 6-α-D-glucosyltransferase

Systematic name: sucrose:1,6(1,3)-α-D-glucan 6(3)-α-D-glucosyltransferase

Comments: The product, which has quite different properties from other dextrans, has been called alternan.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 100630-46-4


1. Cote, G.L. and Robyt, J.F. Isolation and partial characterization of an extracellular glucansucrase from Leuconostoc mesenteroides NRRL B-1355 that synthesizes an alternating (1→6), (1→3)-α-D-glucan. Carbohydr. Res. 101 (1982) 57-74. [PMID: 7060056]

[EC created 1984, modified 2003]

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