The GtfD enzyme of Azotobacter chroococcum is member of the glycoside hydrolase family GH70. The enzyme displays 4,6-α-glucanotransferase activity using malto-oligosaccharides (> DP 4), and starch. However, the enzyme is unable to synthesize consecutive  α(1→6) glucosidic bonds. Instead it forms a high molecular mass, α(1→4,6) branched reuteran like polymer.

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