A simple chemical synthesis of sugar nucleoside diphosphates in water

Efficient One-Pot Synthesis of Uridine Diphosphate Galactose Employing a Trienzyme System

The limited availability of high-cost nucleotide sugars is a significant constraint on the application of their downstream products (glycosides and prebiotics) in the food or pharmaceutical industry. To better solve the problem, this study presented a one-pot approach for the biosynthesis of UDP-Gal using a thermophilic multienzyme system consisting of GalK, UGPase, and PPase. Under optimal conditions, a 2 h reaction resulted in a UTP conversion rate of 87.4%. In a fed-batch reaction with Gal/ATP = 20 mM:10 mM, UDP-Gal accumulated to 33.76 mM with a space-time yield (STY) of 6.36 g/L·h-1 after the second feeding. In repetitive batch synthesis, the average yield of UDP-Gal over 8 cycles reached 10.80 g/L with a very low biocatalyst loading of 0.002 genzymes/gproduct. Interestingly, Galk (Tth0595) could synthesize Gal-1P using ADP as a donor of phosphate groups, which had never been reported before. This approach possessed the benefits of high synthesis efficiency, low cost, and superior reaction system stability, and it provided new insights into the rapid one-pot synthesis of UDP-Gal and high-value glycosidic compounds.

Water-Medium Synthesis of Nucleoside 5'-Polyphosphates

This unit describes a one-pot, two step synthesis of ribonucleoside 5'-di- and 5'-triphosphates, as well as their purification. The first step of the synthesis involves the activation of an unprotected ribonucleoside 5'-monophosphate with 2-chloro-1,3-dimethylimidazolinium hexafluorophosphate and imidazole, in a mixture of water/acetonitrile. The resulting phosphorimidazolate intermediate is then treated with inorganic phosphate or pyrophosphate to afford the corresponding nucleoside 5'-di- or 5'-triphosphates. The attractive features of this strategy include the absence of protecting groups on the starting material and convenient set up (i.e., use of water, non-dry solvents and reagents, commercially available sodium salts). © 2017 by John Wiley & Sons, Inc.