Inulin Fructotransferase (Dfa-Iii-Forming)

The enzyme inulin fructotransferase (DFA-III-forming) (EC 4.2.2.18) catalyzes the following process:

Produces α-D-fructofuranose β-D-fructofuranose 1,2′:2,3′-dianhydride (DFA III) by successively eliminating the diminishing (2→1)-β-D-fructan (inulin) chain from the terminal D-fructosyl-D-fructosyl disaccharide.

Nomenclature

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′:2,3′-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 α-D-fructofuranose β-D-fructofuranose 1,2′:2,3'-dianhydride).

References

• "Action of Arthrobacter ureafaciens inulinase II on several oligofructans and bacterial levans". Biochimica et Biophysica Acta (BBA) - Enzymology 397 (1): 153–63. July 1975. doi:10.1016/0005-2744(75)90189-8. PMID 1148257. 
• "Purification and properties of Arthrobacter ureafaciens inulase II". Biochim. Biophys. Acta 315 (2): 412–420. 1973. doi:10.1016/0005-2744(73)90271-4. 

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