EC 184.108.40.206 - Levan fructotransferase (DFA-IV-forming)
IntEnz Enzyme Nomenclature
2,6-β-D-fructan lyase (di-β-D-fructofuranose-2,6':2',6-dianhydride-forming)
- Produces di-β-D-fructofuranose 2,6':2',6-dianhydride (DFA IV) by successively eliminating the diminishing (2→6)-β-D-fructan (levan) chain from the terminal D-fructosyl-D-fructosyl disaccharide.
This enzyme, like EC 220.127.116.11 [inulin fructotransferase (DFA-I-forming)] and EC 18.104.22.168 [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.
Links to other databases
Characteristics of levan fructotransferase from Arthrobacter ureafaciens K2032 and difructose anhydride IV formation from levan.Enzyme Microb. Technol. 27: 212-218 (2000).
Levan fructotransferase from Arthrobacter oxydans J17-21 catalyzes the formation of the di-D-fructose dianhydride IV from levan.J. Agric. Food Chem. 51: 2632-2636 (2003). [PMID: 12696949]
Difructose anhydrides: Their mass-production and physiological functions.Biosci. Biotechnol. Biochem. 64: 1321-1327 (2000). [PMID: 10945246]
[EC 22.214.171.124 created 2004]