Inulin fructotransferase (DFA-III-forming)

Identifiers
EC no.| 4.2.2.18
CAS no.| 50936-42-0
Databases
IntEnz| IntEnz view
BRENDA| BRENDA entry
ExPASy| NiceZyme view
KEGG| KEGG entry
MetaCyc| metabolic pathway
PRIAM| profile
PDB structures| RCSB PDB PDBe PDBsum
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PMC| articles
PubMed| articles
NCBI| proteins

The enzyme inulin fructotransferase (DFA-III-forming) (EC 4.2.2.18) catalyzes the following process:

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.

## Nomenclature[edit]

This enzyme belongs to the family of lyases, specifically those carbon-oxygen lyases acting on polysaccharides. The systematic name of this enzyme class is (2→1)-β-D-fructan lyase (α-D-fructofuranose-β-D-fructofuranose-1,2′:2,3′-dianhydride-forming). Other names in common use include 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, and α-D-fructofuranose β-D-fructofuranose 1,2′:2,3'-dianhydride).

## References[edit]

* Uchiyama T (July 1975). "Action of Arthrobacter ureafaciens inulinase II on several oligofructans and bacterial levans". Biochimica et Biophysica Acta (BBA) - Enzymology. 397 (1): 153–63. doi:10.1016/0005-2744(75)90189-8. PMID 1148257.
* Uchiyama T, Niwa S, Tanaka K (1973). "Purification and properties of Arthrobacter ureafaciens inulase II". Biochim. Biophys. Acta. 315 (2): 412–420. doi:10.1016/0005-2744(73)90271-4.

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Carbon–oxygen lyases (EC 4.2) (primarily dehydratases)

4.2.1: Hydro-Lyases|

* Carbonic anhydrase
* Fumarase
* Aconitase
* Enolase
* Alpha
* Enolase 2
* Enoyl-CoA hydratase/3-Hydroxyacyl ACP dehydrase
* Methylglutaconyl-CoA hydratase
* Tryptophan synthase
* Cystathionine beta synthase
* Porphobilinogen synthase
* 3-Isopropylmalate dehydratase
* Urocanase
* Uroporphyrinogen III synthase
* Nitrile hydratase

4.2.2: Acting on polysaccharides|

* Hyaluronate lyase
* Pectin lyase

4.2.3: Acting on phosphates|

* Threonine synthase

4.2.99: Other|

* Carboxymethyloxysuccinate lyase
* Hydroperoxide lyase

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Enzymes

Activity|

* Active site
* Binding site
* Catalytic triad
* Oxyanion hole
* Enzyme promiscuity
* Diffusion-limited enzyme
* Cofactor
* Enzyme catalysis

Regulation|

* Allosteric regulation
* Cooperativity
* Enzyme inhibitor
* Enzyme activator

Classification|

* EC number
* Enzyme superfamily
* Enzyme family
* List of enzymes

Kinetics|

* Enzyme kinetics
* Eadie–Hofstee diagram
* Hanes–Woolf plot
* Lineweaver–Burk plot
* Michaelis–Menten kinetics

Types|

* EC1 Oxidoreductases (list)
* EC2 Transferases (list)
* EC3 Hydrolases (list)
* EC4 Lyases (list)
* EC5 Isomerases (list)
* EC6 Ligases (list)
* EC7 Translocases (list)

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