KEGG   ENZYME: 4.2.2.17Help
Entry
EC 4.2.2.17                 Enzyme                                 

Name
inulin fructotransferase (DFA-I-forming);
inulin fructotransferase (DFA-I-producing);
inulin fructotransferase (depolymerizing, difructofuranose-1,2':2',1-dianhydride-forming);
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);
2,1-beta-D-fructan lyase (alpha-D-fructofuranose-beta-D-fructofuranose-1,2':2,1'-dianhydride-forming)
Class
Lyases;
Carbon-oxygen lyases;
Acting on polysaccharides
BRITE hierarchy
Sysname
(2->1)-beta-D-fructan lyase (alpha-D-fructofuranose-beta-D-fructofuranose-1,2':2,1'-dianhydride-forming)
Reaction(IUBMB)
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.
Comment
This enzyme, like EC 4.2.2.16 [levan fructotransferase (DFA-IV-forming)] and EC 4.2.2.18 [inulin fructotransferase (DFA-III-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.
History
EC 4.2.2.17 created 1992 as EC 2.4.1.200, transferred 2004 to EC 4.2.2.17
Orthology
K10677  
inulin fructotransferase (DFA-I-forming)
Genes
KVA: 
KOX: 
RET: 
RLT: 
RLG: 
ART: 
AAU: 
ACH: 
NCA: 
FRE: 
Taxonomy
Reference
1
  Authors
Seki, K., Haraguchi, K., Kishimoto, M., Kobayashi, S. and Kainuma, K.
  Title
Purification and properties of a novel inulin fructotransferase (DFA I-producing) from Arthrobacter globiformis S14-3.
  Journal
Agric. Biol. Chem. 53 (1989) 2089-2094.
Other DBs
ExplorEnz - The Enzyme Database: 
IUBMB Enzyme Nomenclature: 
ExPASy - ENZYME nomenclature database: 
BRENDA, the Enzyme Database: 
CAS: 
125008-19-7

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