– Flavonol 3-O-rhamnosyltransferase that catalyzes the transfer of rhamnose from UDP-rhamnose to the 3-OH position of kaempferol and quercetin. Possesses low quercetin 3-O-glucosyltransferase activity in vitro. UGT78D1 Protein, Arabidopsis thaliana, Recombinant (His) is expressed in E. coli expression system with N-10xHis tag. The predicted molecular weight is 55.6 kDa and the accession number is Q9S9P6.