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abscisic acid glucose ester biosynthesis

General Information: The plant hormone abscisic acid (ABA) is involved in the regulation of several crucial physiological and developmental processes in plants, as well as in the adaptative responses to environmental stresses . The regulation of these processes hinges on the size of the bioactive ABA pool. This pool is thought to be maintained through a finely tuned equilibrium between ABA biosynthesis and catabolism. Among the ABA catabolic pathways, the 8'-hydroxylation pathway leading to the formation of phaseic acid (PA) appears to be the major regulation point. Another important ABA catabolic route operates through the conjugation of ABA (or its hydroxylated derivatives such as PA) with glucose. One of the most widespread conjugates is :CPD-7727 (ABA-GE) . ABA conjugates are thought to be physiologically inactive and to accumulate in vacuoles as the plant matures . Recently, however, ABA-GE was postulated to be involved in the long-distance transport of ABA through the vascular system . About this pathway: The glucosylation of ABA to form ABA-GE has been shown to be catalyzed by a number of glucosyltransferases from Adzuki bean and Arabidopsis thaliana . These enzymes require UDP-glucose as substrate for the reaction. They tend to be able to use a variety of substrates such as indole-3-acetate or trans-cinnamate. The existence of a beta-glucosidase able to catalyze the release of ABA from ABA-GE has been reported in crude extracts of barley leaves, more specifically in the intercellular washing fluid .

from BIOCYC source record: ARA_PWY-5272
Type: pathway
Taxonomic scope
organism-specific biosystem

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