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Inulin fructotransferase (DFA-I-forming)

The enzyme inulin fructotransferase (DFA-I-forming) () catalyzes the following process:

Produces α-<small>D</small>-fructofuranose β-<small>D</small>-fructofuranose 1,2′:2,1′-dianhydride (DFA I) by successively eliminating the diminishing (2→1)-β-<small>D</small>-fructan (inulin) chain from the terminal <small>D</small>-fructosyl-<small>D</small>-fructosyl disaccharide.

This enzyme belongs to the family of lyases, specifically those carbon-oxygen lyases acting on polysaccharides. The systematic name of this enzyme class is (2→1)-β-<small>D</small>-fructan lyase (α-<small>D</small>fructofuranose-β-<small>D</small>-fructofuranose-1,2′:2,1′-dianhydride-forming). Other names in common use include inulin fructotransferase (DFA-I-producing), inulin fructotransferase (depolymerizing,, difructofuranose-1,2':2',1-dianhydride-forming), inulin <small>D</small>-fructosyl-D-fructosyltransferase, (1,2':1',2-dianhydride-forming), inulin <small>D</small>-fructosyl-<small>D</small>-fructosyltransferase (forming, and α-<small>D</small>-fructofuranose β-<small>D</small>-fructofuranose 1,2':1',2-dianhydride).

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