The glucansucrase of Lactobacillus reuteri 180 catalyzes the synthesis of a diversity of α-glucans from sucrose. An enzyme mutation of Leu940 in domain B significantly changed the linkage and reaction specificity. Compared with GTF180-ΔN, the GTF180-ΔN L940E mutant has an increased percentage of α(1→6) linkages and a decreased percentage of α(1→3) linkages in the product. Furthermore, the mutant enzyme has an increased polysaccharide synthesis.

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