Transfers alternately an alpha-D-glucosyl residue from sucrose to the 6-position and the 3-position of the non-reducing terminal residue of an alpha-D-glucan, thus producing a glucan having alternating alpha-(1->6)- and alpha-(1->3)-linkages
Comment
The glucansucrases transfer a D-glucosyl residue from sucrose to a glucan chain. They are classified based on the linkage by which they attach the transferred residue. In some cases, in which the enzyme forms more than one linkage type, classification relies on the relative proportion of the linkages that are generated. This enzyme forms both alpha(1->3) and alpha(1->6) linkages in approximately equal amounts by alternating the linkage type. cf. EC 2.4.1.125, sucrose---1,6-alpha-glucan 3(6)-alpha-glucosyltransferase.
Isolation and partial characterization of an extracellular glucansucrase from Leuconostoc mesenteroides NRRL B-1355 that synthesizes an alternating (1 goes to 6), (1 goes to 3)-alpha-D-glucan.
