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Production and application of a rare disaccharide using sucrose phosphorylase from Leuconostoc mesenteroides.
Journal of Bioscience and Bioengineering 2015 June
Sucrose phosphorylase (SPase) from Leuconostoc mesenteroides exhibited activity towards eight ketohexoses, which behaved as D-glucosyl acceptors, and α-D-glucose-1-phosphate (G1P), which behaved as a donor. All eight of these ketohexoses were subsequently transformed into the corresponding d-glucosyl-ketohexoses. Of the eight ketohexoses evaluated in the current study, d-allulose behaved as the best substrate for SPase, and the resulting d-glucosyl-d-alluloside product was found to be a non-reducing sugar with a specific optical rotation of [α]D(20) + 74.36°. D-Glucosyl-D-alluloside was identified as α-D-glucopyranosyl-(1→2)-β-D-allulofuranoside by NMR analysis. D-Glucosyl-D-alluloside exhibited an inhibitory activity towards an invertase from yeast with a Km value of 50 mM, where it behaved as a competitive inhibitor with a Ki value of 9.2 mM. D-Glucosyl-D-alluloside was also successfully produced from sucrose using SPase and D-tagatose 3-epimerase. This process also allowed for the production of G1P from sucrose and d-allulose from D-fructose, which suggested that this method could be used to prepare d-glucosyl-d-alluloside without the need for expensive reagents such as G1P and d-allulose.
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