_EC 4.2.2.17 Inulin fructotransferase (DFA-I-forming). 0 PDB entries  
EC 4.-.-.- Lyases. [3,841 PDB entries]
EC 4.2.-.- Carbon-oxygen lyases. [1,897 PDB entries]
EC 4.2.2.- Acting on polysaccharides. [117 PDB entries]
EC 4.2.2.17 Inulin fructotransferase (DFA-I-forming). [-]    

Pathway: Inulin Fructotransferase
Reaction: Produces alpha-D-fructofuranose beta-D-fructofuranose 1,2':2,1'-dianhydride (DFA I) by successively eliminating the diminishing (2->1)-beta-D-fructan (inulin) chain from the terminal D-fructosyl-D- fructosyl disaccharide.
Other name(s): Inulin D-fructosyl-D-fructosyltransferase (1,2':1',2-dianhydride- forming). Inulin D-fructosyl-D-fructosyltransferase (forming alpha-D-fructofuranose beta-D-fructofuranose 1,2':1',2-dianhydride). Inulin fructotransferase (depolymerizing, difructofuranose-1,2':2',1- dianhydride-forming). Inulin fructotransferase (DFA-I-producing).
Comments: This enzyme, like Ec 4.2.2.16 and Ec 4.2.2.18 eliminates the fructan chain from the terminal disaccharide leaving a difructose dianhydride. These enzymes have long been known as fructotransferases, so this is retained in the description (official name). Since the transfer is intramolecular, the reaction is an elimination and, hence, the enzyme is a lyase, belonging in enzyme class 4.-.-.-. Formerly Ec 2.4.1.200.
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There are no PDB entries in enzyme class E.C.4.2.2.17