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Information on EC 2.4.1.243 - 6G-fructosyltransferase

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EC Tree
     2 Transferases
         2.4 Glycosyltransferases
             2.4.1 Hexosyltransferases
                2.4.1.243 6G-fructosyltransferase
IUBMB Comments
Inulins are polysaccharides consisting of linear or branched D-fructofuranosyl chains attached to the fructosyl residue of sucrose by a beta(2->1) linkage. This enzyme catalyses the transfer of the terminal (2->1)-linked -D-fructosyl group of an inulin chain onto O-6 position of the glucose residue of another inulin molecule . For example, if 1-kestose [1F-(beta-D-fructofuranosyl)sucrose] is both the donor and recipient in the reaction shown above, i.e., if m = 1 and n = 1, then the products will be sucrose and 6G-di-beta-D-fructofuranosylsucrose. In this notation, the superscripts F and G are used to specify whether the fructose or glucose residue of the sucrose carries the substituent. Alternatively, this may be indicated by the presence and/or absence of primes (see {iupac/2carb/36#362::http://www.chem.qmul.ac.uk/iupac/2carb/36.html#362}). Sucrose cannot be a donor substrate in the reaction (i.e. m cannot be zero) and inulin cannot act as an acceptor. Side reactions catalysed are transfer of a beta-D-fructosyl group between compounds of the structure 1F-(1-beta-D-fructofuranosyl)m-6G-(1-beta-D-fructofuranosyl)n sucrose, where m >= 0 and n = 1 for the donor, and m >= 0 and n >= 0 for the acceptor.
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Word Map
The enzyme appears in viruses and cellular organisms
Synonyms
6g-fft, fructan:fructan 6g-fructosyltransferase, fructan-fructan 6g-fructosyltransferase, more
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
[1-beta-D-fructofuranosyl-(2->1)-]m+1-alpha-D-glucopyranoside + [1-beta-D-fructofuranosyl-(2->1)-]n-alpha-D-glucopyranoside = [1-beta-D-fructofuranosyl-(2->1)-]m-alpha-D-glucopyranoside + [1-beta-D-fructofuranosyl-(2->1)-]n-beta-D-fructofuranosyl-(2->6)-alpha-D-glucopyranoside (m > 0; n >= 0)
show the reaction diagram
m > 0, n ? 0
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