Coniferyl alcohol metabolism in conifers — I. Glucosidic turnover of cinnamyl aldehydes by UDPG: coniferyl alcohol glucosyltransferase from pine cambium
UDPG: coniferyl alcohol glucosyltransferase (CAGT; EC 2.4.1.111) isolated from cambial tissues of Pinus strobus was able to convert cinnamyl aldehydes as well as dihydroconiferyl alcohol into their corresponding 4-O-beta -D-glucosides in vitro. Cinnamyl aldehydes were glucosylated with comparable efficiency to coniferyl alcohol, the physiological substrate for CAGT. Seasonal patterns of CAGT activity for aldehydes were similar to those of coniferyl alcohol. Formation of cinnamyl aldehyde and additional monolignol glucosides indicates that precursor flux and availability for lignification is likely greater than previously recognized. (C) 2001 Elsevier Science Ltd. All rights reserved.
Identification and characterisation of<i>Arabidopsis</i>glycosyltransferases capable of glucosylating coniferyl aldehyde and sinapyl aldehyde
作者:Eng-Kiat Lim、Rosamond G. Jackson、Dianna J. Bowles
DOI:10.1016/j.febslet.2005.04.016
日期:2005.5.23
This study describes the substrate recognition profile of UGT72E1, an UDP–glucose:glycosyltransferase of Arabidopsis thaliana that is the third member of a branch of glycosyltransferases, capable of conjugating lignin monomers and related metabolites. The data show that UGT72E1, in contrast to the two closely related UGTs 72E2 and 72E3, is specific for sinapyl and coniferyl aldehydes. The biochemical properties of UGT72E1 are characterised, and are compared with that of UGT72E2, which is capable of glycosylating the aldehydes as well as coniferyl and sinapyl alcohols.