The N-terminally truncated GtfB enzyme of Lactobacillus fermentum NCC 2970 is a member of the GH70 family. The 4,3-α-glucanotransferase converts amylose and malto-oligosaccharides in an alternating glucan containing 60 % α(1→4) and 40 % α(1→3) glucosidic linkages, and α(1→3,4) branching points.

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*Activity was measured by following the release of glucose from amylose. One unit of enzyme activity is defined as the release of 1 μmol of  substrate per minute.