Reaction: Produces α-D-fructofuranose β-D-fructofuranose 1,2':2,3'-dianhydride (DFA III) by successively eliminating the diminishing (2→1)-β-D-fructan (inulin) chain from the terminal D-fructosyl-D-fructosyl disaccharide.
For diagram click here.
Other name(s): inulin fructotransferase (DFA-III-producing); inulin fructotransferase (depolymerizing); inulase II; inulinase II; inulin fructotransferase (depolymerizing, difructofuranose-1,2':2,3'-dianhydride-forming); inulin D-fructosyl-D-fructosyltransferase (1,2':2,3'-dianhydride-forming); inulin D-fructosyl-D-fructosyltransferase (forming α-D-fructofuranose β-D-fructofuranose 1,2':2,3'-dianhydride)
Systematic name: 2,1-β-D-fructan lyase (α-D-fructofuranose-β-D-fructofuranose-1,2':2,3'-dianhydride-forming)
Comments: This enzyme, like EC 22.214.171.124 [levan fructotransferase (DFA-IV-forming)] and EC 126.96.36.199 [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.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 50936-42-0
1. Uchiyama, T. Action of Arthrobacter ureafaciens inulinase II on several oligofructans and bacterial levans. Biochim. Biophys. Acta 397 (1975) 153-163. [PMID: 1148257]
2. Uchiyama, T., Niwa, S. and Tanaka, K. Purification and properties of Arthrobacter ureafaciens inulase II. Biochim. Biophys. Acta 315 (1973) 412-420.