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Wu T, Wang Y, Zhang N, Yin D, Xu Y, Nie Y, Mu X. Reshaping Substrate-Binding Pocket of Leucine Dehydrogenase for Bidirectionally Accessing Structurally Diverse Substrates. ACS Catal 2022. [DOI: 10.1021/acscatal.2c04735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Tao Wu
- Laboratory of Brewing Microbiology and Applied Enzymology, Key Laboratory of Industrial Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi214122, China
- Suqian Jiangnan University Institute of Industrial Technology, Suqian223800, China
| | - Yinmiao Wang
- Laboratory of Brewing Microbiology and Applied Enzymology, Key Laboratory of Industrial Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi214122, China
| | - Ningxin Zhang
- Laboratory of Brewing Microbiology and Applied Enzymology, Key Laboratory of Industrial Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi214122, China
| | - Dejing Yin
- Laboratory of Brewing Microbiology and Applied Enzymology, Key Laboratory of Industrial Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi214122, China
| | - Yan Xu
- Laboratory of Brewing Microbiology and Applied Enzymology, Key Laboratory of Industrial Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi214122, China
| | - Yao Nie
- Laboratory of Brewing Microbiology and Applied Enzymology, Key Laboratory of Industrial Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi214122, China
| | - Xiaoqing Mu
- Laboratory of Brewing Microbiology and Applied Enzymology, Key Laboratory of Industrial Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi214122, China
- Suqian Jiangnan University Institute of Industrial Technology, Suqian223800, China
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Characterization of a New Marine Leucine Dehydrogenase from Pseudomonas balearica and Its Application for L-tert-Leucine Production. Catalysts 2022. [DOI: 10.3390/catal12090971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Leucine dehydrogenase (LeuDH) has emerged as the most promising biocatalyst for L-tert-leucine (L-Tle) production via asymmetric reduction in trimethylpyruvate (TMP). In this study, a new LeuDH named PbLeuDH from marine Pseudomonas balearica was heterologously over-expressed in Escherichia coli, followed by purification and characterization. PbLeuDH possessed a broad substrate scope, displaying activities toward numerous L-amino acids and α-keto acids. Notably, compared with those reported LeuDHs, PbLeuDH exhibited excellent catalytic efficiency for TMP with a Km value of 4.92 mM and a kcat/Km value of 24.49 s−1 mM−1. Subsequently, L-Tle efficient production was implemented from TMP by whole-cell biocatalysis using recombinant E. coli as a catalyst, which co-expressed PbLeuDH and glucose dehydrogenase (GDH). Ultimately, using a fed-batch feeding strategy, 273 mM (35.8 g L−1) L-Tle was achieved with a 96.1% yield and 2.39 g L−1 h−1 productivity. In summary, our research provides a competitive biocatalyst for L-Tle green biosynthesis and lays a solid foundation for the realization of large-scale L-Tle industrial production.
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