Issue 69, 2016, Issue in Progress

Precisely regulated galactosylation of nucleoside analogues in aqueous hydrophilic solvents catalyzed by solvent-stable β-galactosidase

Abstract

Efficient synthesis of unitary β-galactosyl nucleoside analogues was successfully achieved in a 10% DMSO solvent system, catalyzed by a newly isolated solvent-stable β-galactosidase from solvent-tolerant Bacillus megaterium YZ08. The most efficient sugar donor for the galactosylation of nucleoside analogues was lactose rather than nitrophenyl glycoside. However, it was accompanied with the formation of complicated digalactosyl nucleoside analogues in the buffer system. The addition of DMSO not only prominently increased the stabilization of β-galactosidase but also regulated the products from complicated products to unitary monogalactosyl nucleoside analogues, which could significantly simplify the process of subsequent separation. Strikingly, the affinity of β-galactosidase to 3′-azido-3′-deoxythymidine in 10% DMSO was significantly enhanced, and the catalytic efficiency (kcat/Km) was doubled as compared to that in buffer solution. These results indicated that solvent-stable glycosidase possesses attractive potency in biosynthesis as well as in regulation of the glycoside prodrugs by adjusting the reaction solvent system.

Graphical abstract: Precisely regulated galactosylation of nucleoside analogues in aqueous hydrophilic solvents catalyzed by solvent-stable β-galactosidase

Supplementary files

Article information

Article type
Paper
Submitted
10 May 2016
Accepted
26 Jun 2016
First published
08 Jul 2016

RSC Adv., 2016,6, 64841-64846

Precisely regulated galactosylation of nucleoside analogues in aqueous hydrophilic solvents catalyzed by solvent-stable β-galactosidase

Y. Zhou, J. Chu, J. Zhang, K. Liu and B. He, RSC Adv., 2016, 6, 64841 DOI: 10.1039/C6RA12167E

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