ID 4.2.2.17 DE inulin fructotransferase (DFA-I-forming). AN inulin D-fructosyl-D-fructosyltransferase (1,2':1',2-dianhydride- AN forming). AN inulin D-fructosyl-D-fructosyltransferase (forming alpha-D-fructofuranose AN beta-D-fructofuranose 1,2':1',2-dianhydride). AN inulin fructotransferase (depolymerizing, difructofuranose-1,2':2',1- AN dianhydride-forming). AN inulin fructotransferase (DFA-I-producing). CA Produces alpha-D-fructofuranose beta-D-fructofuranose CA 1,2':2,1'-dianhydride (DFA I) by successively eliminating the diminishing CA (2->1)-beta-D-fructan (inulin) chain from the terminal D-fructosyl-D- CA fructosyl disaccharide. CC -!- This enzyme, like EC 4.2.2.16 and EC 4.2.2.18 eliminates the fructan CC chain from the terminal disaccharide leaving a difructose CC dianhydride. CC -!- These enzymes have long been known as fructotransferases, so this is CC retained in the description (official name). CC -!- Since the transfer is intramolecular, the reaction is an elimination CC and, hence, the enzyme is a lyase, belonging in enzyme class 4.-.-.-. CC -!- Formerly EC 2.4.1.200. DR P19870, INU2_ARTGO ; //