UDP-Glucose Sterol ß-Glucosyl Transferase, a Plant Sterol Conjugating Enzyme
Part of the NATO ASI Series book series (NSSA, volume 116)
Steryl glucosides and acylated steryl glucosides are present with free and esterified sterols in all plant tissues investigated so far, most probably as components of membrane structures1. The glucosylation of sterols is catalyzed by UDP-glucose sterol ß-D-glucosyl transferase (UDPG-SGTase), a plasma membrane bound enzyme of plant cells2. The reaction consists of a glucose transfer from UDP-glucose to a phytosterol with formation of a ß-glucosidic linkage between the anomeric carbon of glucose and the 3-hydroxyl group of the sterol1:
Studies in other laboratories1 and ours3 indicate clearly that UDPG-SGTase is specific for UDP-glucose and natural 4-demethyl sterols.
KeywordsAnomeric Carbon Steryl Glucoside Maize Coleoptile Lipid Dependence Glucose Transfer
UDP-glucose sterol ß-D-glucosyl transferase
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© Plenum Press, New York 1986