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4.2.2.18: inulin fructotransferase (DFA-III-forming)

This is an abbreviated version!
For detailed information about inulin fructotransferase (DFA-III-forming), go to the full flat file.

Word Map on EC 4.2.2.18

Reaction

[inulin]n
=
[inulin]n-2
+
alpha-D-fructofuranose beta-D-fructofuranose 1,2':2,3'-dianhydride

Synonyms

Achl_2902, BsIFTase, di-D-fructofuranose 1,2': 2,3' dianhydride [DFA III]-producing IFTase, EC 2.4.1.93, fructotransferase, inulin (depolymerizing), IFTase, IFTase (DFA III-producing), IFTaseIII, inulase II, inulin D-fructosyl-D-fructosyltransferase (1,2':2,3'-dianhydride-forming), inulin fructotransferase (depolymerizing), inulin fructotransferase (depolymerizing, difructofuranose-1,2':2,3'-dianhydride-forming), inulin fructotransferase (DFA III-producing), inulin fructotransferase (DFA-III-producing), inulin fructotransferase (DFAIII-producing), inulinase II

ECTree

     4 Lyases
         4.2 Carbon-oxygen lyases
             4.2.2 Acting on polysaccharides
                4.2.2.18 inulin fructotransferase (DFA-III-forming)

Systematic Name

Systematic Name on EC 4.2.2.18 - inulin fructotransferase (DFA-III-forming)

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SYSTEMATIC NAME
IUBMB Comments
(2->1)-beta-D-fructan lyase (alpha-D-fructofuranose-beta-D-fructofuranose-1,2':2,3'-dianhydride-forming)
This enzyme, like EC 4.2.2.16 [levan fructotransferase (DFA-IV-forming)] and EC 4.2.2.17 [inulin fructotransferase (DFA-I-forming)] 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 accepted name. Since the transfer is intramolecular, the reaction is an elimination and, hence, the enzyme is a lyase, belonging in EC 4.