Volume 15, Issue 12 e202300238
Research Article

Directed Evolution to Reverse Epoxide Hydrolase Enantioselectivity for meso-3,4-Epoxytetrahydrofuran

Dr. Kaori Hiraga

Corresponding Author

Dr. Kaori Hiraga

Process Research & Development, Merck & Co., Inc, Rahway, NJ 07065, USA

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Dr. Tetsuji Itoh

Corresponding Author

Dr. Tetsuji Itoh

Process Research & Development, Merck & Co., Inc, Rahway, NJ 07065, USA

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Dr. Deeptak Verma

Dr. Deeptak Verma

Modeling and Informatics, Merck & Co., Inc Rahway, NJ 07065, USA

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Dr. Wei Wang

Dr. Wei Wang

API process research & development – Biocatalysis, Shanghai STA Pharmaceutical R&D Co., Ltd, Shanghai 200131, P. R. China

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Chen Huang

Chen Huang

API process research & development – Biocatalysis, Shanghai STA Pharmaceutical R&D Co., Ltd, Shanghai 200131, P. R. China

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Dr. Michael Ardolino

Dr. Michael Ardolino

Process Research & Development, Merck & Co., Inc, Rahway, NJ 07065, USA

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Dr. Yong-Li Zhong

Dr. Yong-Li Zhong

Process Research & Development, Merck & Co., Inc, Rahway, NJ 07065, USA

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Dr. Grant Murphy

Dr. Grant Murphy

Process Research & Development, Merck & Co., Inc, Rahway, NJ 07065, USA

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First published: 29 March 2023

Graphical Abstract

The epoxide hydrolase from Alphaproteobacteria bacterium was identified to convert meso-3,4-epoxytetrahydrofuran (1) to (3R,4R)-tetrahydrofurandiol [(RR)-2] predominantly. The enzyme was engineered via directed evolution to revert its original enantioselectivity to generate (3S,4S)-tetrahydrofurandiol [(SS)-2] in quantitative yield and to tolerate an extremely high substrate concentration desired for industrial processes.

Abstract

Chiral vicinal diols are important intermediates in the synthesis of pharmaceuticals. Epoxide hydrolases catalyze hydrolytic ring opening of epoxides to produce the corresponding vicinal diols, providing an attractive way to access these building blocks under mild conditions in a stereoselective and atom-efficient manner. In this study, an epoxide hydrolase is identified and engineered to form (3S,4S)-tetrahydrofurandiol in high optical purity via the desymmetrization of meso-3,4-epoxytetrahydrofuran. In nine rounds of directed evolution, the enzyme's native (3R,4R)-stereopreference was reversed and its activity was dramatically improved to achieve quantitative yield under remarkably high 500 g/L substrate concentration and low enzyme loading. Computational modelling provides insights on the changes in enzyme-substrate interaction that result in divergent enantioselectivities afforded by evolved variants.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.