The Enzyme Database

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Accepted name: fructan β-(2,6)-fructosidase
Reaction: Hydrolysis of terminal, non-reducing (2→6)-linked β-D-fructofuranose residues in fructans
For diagram of reaction, click here
Other name(s): β-(2-6)-fructan exohydrolase; levanase; 6-FEH; β-(2,6)-D-fructan fructohydrolase
Systematic name: (2→6)-β-D-fructan fructohydrolase
Comments: Possesses one of the activities of EC, fructan β-fructosidase. While the best substrates are the levan-type fructans such as 6-kestotriose [β-D-fructofuranosyl-(2→6)-β-D-fructofuranosyl α-D-glucopyranoside] and 6,6-kestotetraose [β-D-fructofuranosyl-(2→6)-β-D-fructofuranosyl-(2→6)-β-D-fructofuranosyl α-D-glucopyranoside], some (but not all) inulin-type fructans can also be hydrolysed, but more slowly [cf. EC, fructan β-(2,1)-fructosidase]. Sucrose, while being a very poor substrate, can substantially inhibit enzyme activity in some cases.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number: 1000597-62-5
1.  Marx, S.P., Nösberger, J. and Frehner, M. Hydrolysis of fructan in grasses: A β-(2-6)-linkage specific fructan-β-fructosidase from stubble of Lolium perenne. New Phytol. 135 (1997) 279–290.
2.  Van den Ende, W., De Coninck, B., Clerens, S., Vergauwen, R. and Van Laere, A. Unexpected presence of fructan 6-exohydrolases (6-FEHs) in non-fructan plants: characterization, cloning, mass mapping and functional analysis of a novel 'cell-wall invertase-like' specific 6-FEH from sugar beet (Beta vulgaris L.). Plant J. 36 (2003) 697–710. [DOI] [PMID: 14617070]
3.  Henson, C.A. and Livingston, D.P. , III. Purification and characterization of an oat fructan exohydrolase that preferentially hydrolyzes β-2,6-fructans. Plant Physiol. 110 (1996) 639–644. [PMID: 8742337]
[EC created 2005]

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