title: Sequential glucosylation of a furofuran lignan, (+)-sesaminol, by Sesamum indicum UGT71A9 and UGT94D1 glucosyltransferases.
abstract: (+)-Sesaminol 2-O-triglucoside is the most abundant water-soluble furofuran lignan in sesame seeds (Sesamum indicum) and is considered to be a beneficial compound for human health. The biosyntheses and physiological roles of lignan glycosides, however, remain elusive. Here we report the molecular identification and biochemical characterization of two Sesamum uridine diphosphate (UDP) glucose:lignan glucosyltransferases. Sesamum indicum UGT71A9 preferentially glucosylated at the 2-hydroxyl group of (+)-sesaminol, resulting in (+)-sesaminol 2-O-glucoside. Similarly, two UGT71A9 homologs from Sesamum radiatum (UGT71A10) and Sesamum alatum (UGT71A8) also showed (+)-sesaminol glucosylating activity, evidencing the functional conservation of (+)-sesaminol 2-O-glucosyltransferases in the Sesamum genus. In addition, S. indicum UGT94D1 specifically glucosylated at the 6'-hydroxyl group of the sugar moiety of (+)-sesaminol 2-O-glucoside but not at that of flavonoid glucosides. The gene expression patterns of UGT71A9 and UGT94D1 during seed development were correlated with the glucosylating activities toward (+)-sesaminol in planta, suggesting that the two lignan UDP-glycosyltransferases participate in the sequential glucosylation steps in the biosynthesis of (+)-sesaminol 2-O-triglucoside.
authors.affiliation: Institute for Health Care Science, Suntory Ltd, 1-1-1 Wakayamadai, Shimamoto, Mishima, Osaka 618-8503, Japan.
authors.forename: Akio
authors.initials: A
authors.lastname: Noguchi
authors.forename: Yuko
authors.initials: Y
authors.lastname: Fukui
authors.forename: Asako
authors.initials: A
authors.lastname: Iuchi-Okada
authors.forename: Saki
authors.initials: S
authors.lastname: Kakutani
authors.forename: Honoo
authors.initials: H
authors.lastname: Satake
authors.forename: Takashi
authors.initials: T
authors.lastname: Iwashita
authors.forename: Masahiro
authors.initials: M
authors.lastname: Nakao
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Umezawa
authors.forename: Eiichiro
authors.initials: E
authors.lastname: Ono
mesh_terms: D002851:Chromatography, High Pressure Liquid; D004149:Dioxoles / Q000737:chemistry / Q000378:metabolism*; D005663:Furans / Q000737:chemistry / Q000378:metabolism*; D015971:Gene Expression Regulation, Enzymologic; D018506:Gene Expression Regulation, Plant; D005960:Glucosides / Q000737:chemistry / Q000378:metabolism; D005964:Glucosyltransferases / Q000235:genetics / Q000378:metabolism*; D017705:Lignans / Q000737:chemistry / Q000378:metabolism*; D008954:Models, Biological; D015394:Molecular Structure; D010802:Phylogeny; D010936:Plant Extracts / Q000737:chemistry / Q000378:metabolism; D031685:Sesamum / Q000201:enzymology* / Q000235:genetics / Q000378:metabolism; D014532:Uridine Diphosphate Glucose / Q000737:chemistry / Q000378:metabolism
chemical_list: D004149:Dioxoles; D005663:Furans; D005960:Glucosides; D017705:Lignans; D010936:Plant Extracts; C518861:sesaminol triglucoside; C066016:sesaminol; D005964:Glucosyltransferases; D014532:Uridine Diphosphate Glucose