Inulin fructotransferase (DFA-III-forming)

In enzymology, an inulin fructotransferase (DFA-III-forming) is an enzyme that catalyzes the chemical reaction


 * Produces alpha-D-fructofuranose beta-D-fructofuranose 1,2':2,3'-dianhydride (DFA III) by successively eliminating the diminishing (2->1)-beta-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-beta-D-fructan lyase (alpha-D-fructofuranose-beta-D-fructofuranose-1,2':2,3'-dianhydride- forming). Other names in common use include inulin fructotransferase (DFA-III-producing), inulin fructotransferase (depolymerizing), inulase II, inulinase II, inulin fructotransferase (depolymerizing,, difructofuranose-1,2':2,3'-dianhydride-forming), inulin D-fructosyl-D-fructosyltransferase, (1,2':2,3'-dianhydride-forming), inulin D-fructosyl-D-fructosyltransferase (forming, and alpha-D-fructofuranose beta-D-fructofuranose 1,2':2,3'-dianhydride).

Structural studies
As of late 2007, two structures have been solved for this class of enzymes, with PDB accession codes and.