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Selective production of rubusoside from stevioside by using the sophorose activity of β-glucosidase from Streptomyces sp. GXT6

Journal name:Applied Microbiology and Biotechnology
Document No.:Doi:10.?1007/?s00253-015-6802-z
Document URL: http://link.springer.com/article/10.1007/s00253-015-6802-z
Date publication:22 July 2015

Abstract

In order to produce rubusoside, enzymes with preferential specificity for the saccharide sophorose were tested for ability to produce rubusoside from stevioside. We identified BGL1, a β-glucosidase from Streptomyces sp. GXT6, as an enzyme for rubusoside production. Out of several saccharide substrates, BGL1 showed the most affinity to sophorose. This enzyme only hydrolyzes the glucose moiety of the sophoroside at C-13 in stevioside. Production of rubusoside was determined by 1H and 13C nuclear magnetic resonance (NMR). Thus, rubusoside was produced from stevioside and the stevioside conversion rate was 98.2 %. The production yield of rubusoside was 78.8 % in 6 h.

 

Steviolbioside was purchased from Chengdu Herbpurify Co., Ltd. (Chengdu, China). ...

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