Synthesis of hydroxycinnamic acid esters of betacyanins via 1-O-acylglucosides of hydroxycinnamic acids by protein preparations from cell suspension cultures of Chenopodium rubrum and petals of Lampranthus sociorum

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Abstract
Protein preparations from cell suspension cultures of Chenopodium rubrum L. and petals of Lampranthus sociorum (L.Bol.) N.E.Br. (Mes.C.L.Bol.) catalyzed the formation of acylated betacyanins, i.e. celosianin I and II (p-coumaroyl-and feruloylamaranthins) and lampranthin I and II (p-coumaroyl- and feruloylbetanins), from 1-O-(p-coumaroyl)-and 1-O-feruloyl-β-glucoses as acyldonors and the respective acceptor molecules amaranthin (betanidin 5-O-sophorobiuronic acid = betanidin 5-O-β-[1″→2′]-glucuronosyl-β-glucoside) and betanin (betanidin 5-O-β-glucoside). The enzymes involved could generally be classified as 1-O-hydroxycinnamoyl-β-glucose:betanidinglycoside O-hydroxycinnamoyltransferases (EC 2.3.1.-).