quercetin 3 sulfate/flaveria

Flaveria spp. accumulate flavonol sulfate esters whose biosynthesis is catalyzed by a number of position-specific flavonol sulfotransferases. Although the accumulation of sulfated flavonols appears to be tissue specific and developmentally regulated and to vary among related species, little is known

The flavonol 3- and 4'-sulfotransferases (ST) from Flaveria chloraefolia catalyze the transfer of the sulfonate group from 3'-phosphoadenosine 5'-phosphosulfate (PAdoPS) to position 3 of flavonol aglycones and position 4' of flavonol 3-sulfates. We identified previously a protein segment, designated