The GtfML4 of Lactobacillus reuteri strain ML1 is a member of the glycoside hydrolase family GH70. The enzyme is a 4,6-α-glucanotransferase converting pure malto-oligosaccharide substrates (≥ Dp 4) into linear oligosaccharides and polysaccharides. The products formed by maltohexaose and maltoheptaose (Dp 6 en 7) contain ~50 % α(1→4)-, and  ~50 % α(1→6) linkages.

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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.