6G-fructosyltransferase

In enzymology, a 6G-fructosyltransferase (EC number|2.4.1.243) is an enzyme that catalyzes the chemical reaction

: [1-beta-D-fructofuranosyl-(2->1)-] m⁺1 alpha-D-glucopyranoside + [1-beta-D-fructofuranosyl-(2->1)-] n⁺1 alpha-D-glucopyranoside $ightleftharpoons$ [1-beta-D-fructofuranosyl-(2->1)-] m alpha-D-glucopyranoside + [1-beta-D-fructofuranosyl-(2->1)-] n⁺1 beta-D-fructofuranosyl-(2->6)-alpha-D-glucopyranoside (m > 0; n >$ightleftharpoons$ 0)

Thus, the two substrates of this enzyme are [1-beta-D-fructofuranosyl-(2->1)-] m+1 alpha-D-glucopyranoside and [1-beta-D-fructofuranosyl-(2->1)-] n+1 alpha-D-glucopyranoside, whereas its 4 products are [1-beta-D-fructofuranosyl-(2->1)-] m alpha-D-glucopyranoside, [1-beta-D-fructofuranosyl-(2->1)-] n+1, beta-D-fructofuranosyl-(2->6)-alpha-D-glucopyranoside (m > 0; n >=, and 0).

This enzyme belongs to the family of glycosyltransferases, specifically the hexosyltransferases. The systematic name of this enzyme class is 1F-oligo [beta-D-fructofuranosyl-(2->1)-] sucrose 6G-beta-D-fructotransferase. Other names in common use include fructan:fructan 6G-fructosyltransferase, 1F(1-beta-D-fructofuranosyl)m, sucrose:1F(1-beta-D-fructofuranosyl)nsucrose, 6G-fructosyltransferase, 6G-FFT, 6G-FT, and 6G-fructotransferase.

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