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AMB Express. 2017 Oct 4;7(1):186. doi: 10.1186/s13568-017-0487-x.

Improved conversion of ginsenoside Rb1 to compound K by semi-rational design of Sulfolobus solfataricus β-glycosidase.

Author information

1
Department of Bioscience and Biotechnology, Konkuk University, Seoul, 05029, Republic of Korea.
2
Department of Bioscience and Biotechnology, Konkuk University, Seoul, 05029, Republic of Korea. deokkun@konkuk.ac.kr.

Abstract

Ginsenoside compound K has been used as a key nutritional and cosmetic component because of its anti-fatigue and skin anti-aging effects. β-Glycosidase from Sulfolobus solfataricus (SS-BGL) is known as the most efficient enzyme for compound K production. The hydrolytic pathway from ginsenoside Rb1 to compound K via Rd and F2 is the most important because Rb1 is the most abundant component in ginseng extract. However, the enzymatic conversion of ginsenoside Rd to F2 is a limiting step in the hydrolytic pathway because of the relatively low activity for Rd. A V209 residue obtained from error-prone PCR was related to Rd-hydrolyzing activity, and a docking pose showing an interaction with Val209 was selected from numerous docking poses. W361F was obtained by rational design using the docking pose that exhibited 4.2-fold higher activity, 3.7-fold higher catalytic efficiency, and 3.1-fold lower binding energy for Rd than the wild-type enzyme, indicating that W361F compensated for the limiting step. W361F completely converted Rb1 to compound K with a productivity of 843 mg l-1 h-1 in 80 min, and showed also 7.4-fold higher activity for the flavanone, hesperidin, than the wild-type enzyme. Therefore, the W361F variant SS-BGL can be useful for hydrolysis of other glycosides as well as compound K production from Rb1, and semi-rational design is a useful tool for enhancing hydrolytic activity of β-glycosidase.

KEYWORDS:

Ginsenoside compound K; Semi-rational design; Sulfolobus solfataricus β-glycosidase

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