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Applied Biochemistry and Biotechnology

, Volume 186, Issue 3, pp 563–575 | Cite as

Highly Efficient Deracemization of Racemic 2-Hydroxy Acids in a Three-Enzyme Co-Expression System Using a Novel Ketoacid Reductase

  • Ya-Ping Xue
  • Chuang Wang
  • Di-Chen Wang
  • Zhi-Qiang Liu
  • Yu-Guo Zheng
Article

Abstract

Enantiopure 2-hydroxy acids (2-HAs) are important intermediates for the synthesis of pharmaceuticals and fine chemicals. Deracemization of racemic 2-HAs into the corresponding single enantiomers represents an economical and highly efficient approach for synthesizing chiral 2-HAs in industry. In this work, a novel ketoacid reductase from Leuconostoc lactis (LlKAR) with higher activity and substrate tolerance towards aromatic α-ketoacids was discovered by genome mining, and then its enzymatic properties were characterized. Accordingly, an engineered Escherichia coli (HADH-LlKAR-GDH) co-expressing 2-hydroxyacid dehydrogenase, LlKAR, and glucose dehydrogenase was constructed for efficient deracemization of racemic 2-HAs. Most of the racemic 2-HAs were deracemized to their (R)-isomers at high yields and enantiomeric purity. In the case of racemic 2-chloromandelic acid, as much as 300 mM of substrate was completely transformed into the optically pure (R)-2-chloromandelic acid (> 99% enantiomeric excess) with a high productivity of 83.8 g L−1 day−1 without addition of exogenous cofactor, which make this novel whole-cell biocatalyst more promising and competitive in practical application.

Keywords

Biocatalysis 2-Hydroxy acid Deracemization Ketoacid reductase Co-expression (R)-2-Chloromandelic acid 

Notes

Funding Information

This work was funded by the National Natural Science Foundation of China (No. 21676254).

Compliance with Ethical Standards

Conflict of Interest

The authors declare that there is no conflict of interest.

Ethical Statement

The authors declare that there are no studies conducted with human participants or animals.

Supplementary material

12010_2018_2760_MOESM1_ESM.docx (3.1 mb)
ESM 1 (DOCX 3165 kb)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and BioengineeringZhejiang University of TechnologyHangzhouChina
  2. 2.Engineering Research Center of Bioconversion and Biopurification of Ministry of EducationZhejiang University of TechnologyHangzhouChina

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