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  • Title: Cloning and heterologous expression of a rape cDNA encoding UDP-glucose:sinapate glucosyltransferase.
    Author: Milkowski C, Baumert A, Strack D.
    Journal: Planta; 2000 Nov; 211(6):883-6. PubMed ID: 11144274.
    Abstract:
    A cDNA encoding a UDP-glucose:sinapate glucosyltransferase (SGT) that catalyzes the formation of 1-O-sinapoylglucose, was isolated from cDNA libraries constructed from immature seeds and young seedlings of rape (Brassica napus L.). The open reading frame encoded a protein of 497 amino acids with a calculated molecular mass of 55,970 Da and an isoelectric point of 6.36. The enzyme, functionally expressed in Escherichia coli, exhibited broad substrate specificity, glucosylating sinapate, cinnamate, ferulate, 4-coumarate and caffeate. Indole-3-acetate, 4-hydroxybenzoate and salicylate were not conjugated. The amino acid sequence of the SGT exhibited a distinct sequence identity to putative indole-3-acetate glucosyltransferases from Arabidopsis thaliana and a limonoid glucosyltransferase from Citrus unshiu, indicating that SGT belongs to a distinct subgroup of glucosyltransferases that catalyze the formation of 1-O-acylglucosides (beta-acetal esters).
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