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 .


  • Uchiyama T "Action of Arthrobacter ureafaciens inulinase II on several oligofructans and bacterial levans". Biochim. Biophys. Acta. 397 153–63.
  • Uchiyama T, Niwa S and Tanaka K "Purification and properties of Arthrobacter ureafaciens inulase II". Biochim. Biophys. Acta 315 412–420.

External links

The CAS registry number for this enzyme class is .

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