Inulin fructotransferase (DFA-I-forming)

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


 * Produces α- D -fructofuranose β- D -fructofuranose 1,2′:2,1′-dianhydride (DFA I) by successively eliminating the diminishing (2→1)-β- D -fructan (inulin) chain from the terminal D -fructosyl- D -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- D -fructan lyase (α- D fructofuranose-β- D -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 D -fructosyl-D-fructosyltransferase, (1,2':1',2-dianhydride-forming), inulin D -fructosyl- D -fructosyltransferase (forming, and α- D -fructofuranose β- D -fructofuranose 1,2':1',2-dianhydride).