Abstract
Rebaudioside A has superior taste quality among the steviol glycosides extracted from Stevia rebaudiana leaves. Given its high purity as a general-purpose sweetener, rebaudioside A has received significant attention and has been widely applied in food and beverages in recent decades. Stevioside is one of the major steviol glycosides and can be converted to rebaudioside A by the uridine-diphosphate dependent glucosyltransferase UGT76G1 in S. rebaudiana. To explore the applicability of and limits in producing rebaudioside A from stevioside through whole-cell biocatalysis, the engineered Saccharomyces cerevisiae expressing UGT76G1, using a newly constructed constitutive expression vector, was used as the whole-cell biocatalyst. Citrate was added to the reaction mixture to allow metabolic regulation when glucose was fed to provide the activated sugar donor UDP-glucose for glycosylation of stevioside in vivo. In an evaluation of the whole-cell reaction parameters involving cell permeability, temperature, pH, citrate and Mg2+ concentrations, and glucose feeding, production of 1160.5 mg/L rebaudioside A from 2 g/L stevioside was achieved after 48 h without supplementation of extracellular UDP-glucose.
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This work was financially supported by PAPD, NSFC (grant number 21106068), and Doctoral Fund of Ministry of Education of China (grant number 20113221120002).
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The authors declare that they have no competing interests.
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Li, Y., Li, Y., Wang, Y. et al. Production of Rebaudioside A from Stevioside Catalyzed by the Engineered Saccharomyces cerevisiae . Appl Biochem Biotechnol 178, 1586–1598 (2016). https://doi.org/10.1007/s12010-015-1969-4
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DOI: https://doi.org/10.1007/s12010-015-1969-4