6G-fructosyltransferase

From Wikipedia, the free encyclopedia

In enzymology, a 6G-fructosyltransferase (EC 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 $\rightleftharpoons$ [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 > $\rightleftharpoons$ 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.

[edit] References

IUBMB entry for 2.4.1.243
BRENDA references for 2.4.1.243 (Recommended.)
PubMed references for 2.4.1.243
PubMed Central references for 2.4.1.243
Google Scholar references for 2.4.1.243
Shiomi N (1981). "Purification and characterisation of 6G-fructosyltransferase from the roots of asparagus (Asparagus officinalis L.)". Carbohydr. Res. 96: 281–292. doi:10.1016/S0008-6215(00)81878-9.
Shiomi N (1982). "Reverse reaction of fructosyl transfer catalysed by asparagus 6G-fructosyltransferase". Carbohydr. Res. 106: 166–169. doi:10.1016/S0008-6215(00)80743-0.
Shiomi N and Ueno K (2004). "Cloning and expression of genes encoding fructosyltransferases from higher plants in food technology". J. Appl. Glycosci. 51: 177–183.
Ueno K, Onodera S, Kawakami A, Yoshida M, Shiomi N (2005). "Molecular characterization and expression of a cDNA encoding fructan:fructan 6G-fructosyltransferase from asparagus (Asparagus officinalis)". New. Phytol. 165: 813–24. doi:10.1111/j.1469-8137.2004.01294.x. PMID 15720693.