Uridine diphosphate glucose, structure

F5. Fevery, J., Leroy, P., Van De Vijver, M., and Heirwegh, K. P. M., Structures of bilirubin conjugates synthesized in vitro from bilirubin and uridine diphosphate glucuronic acid, uridine diphosphate glucose or uridine diphosphate xylose by preparations from rat liver. Biochem. J. 129, 635-644 (1972). 

E. I. Budowsky, T. N. Druzhinina, G. I. Eliseeva, N. D. Gabrielyan, N. K. Kochetkov, M. A. Novikova, V. N. Shibaev, and G. L. Zhdanov, Synthetic analogues of uridine diphosphate glucose Biochemical and chemical studies. The secondary structure of nucleoside diphosphate sugars, Biochim. Biophys. Acta, 122 (1966) 213-224. 

From extensive analysis of recombinant proteins, and the crystal structure of A. thaliana protein, detailed reaction mechanisms have been proposed. The ANS reaction likely proceeds via stereospecific hydroxylation of the leucoanthocyanidin (flavan-3,4-cA-diol) at the C-3 to give a flavan-3,3,4-triol, which spontaneously 2,3-dehydrates and isomerizes to 2-flaven-3,4-diol, which then spontaneously isomerizes to a thermodynamically more stable anthocyanidin pseudobase, 3-flaven-2,3-diol (Figure 3.2). The formation of 3-flaven-2,3-diol via the 2-flaven-3,4-diol was previously hypothesized by Heller and Forkmann. The reaction sequence, and the subsequent formation of the anthocyanidin 3-D-glycoside, does not require activity of a separate dehydratase, which was once postulated. Recombinant ANS and uridine diphosphate (UDP)-glucose flavonoid 3-D-glucosyltransferase (F3GT, sometimes... 

UDP-glucose is an activated form of glucose involved in the synthesis of glycogen. It is a nucleotide in which a-D-glucose is esterified at C-1 by the terminal phosphate of uridine diphosphate (UDP). From this description, draw the structure of UDP-glucose. 

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