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Wang L, Yao J, Tu T, Yao B, Zhang J. Heterotrophic and autotrophic production of L-isoleucine and L-valine by engineered Cupriavidus necator H16. BIORESOURCE TECHNOLOGY 2024; 398:130538. [PMID: 38452952 DOI: 10.1016/j.biortech.2024.130538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2023] [Revised: 02/14/2024] [Accepted: 03/04/2024] [Indexed: 03/09/2024]
Abstract
Advancement in commodity chemical production from carbon dioxide (CO2) offers a promising path towards sustainable development goal. Cupriavidus necator is an ideal host to convert CO2 into high-value chemicals, thereby achieving this target. Here, C. necator was engineered for heterotrophic and autotrophic production of L-isoleucine and L-valine. Citramalate synthase was introduced to simplify isoleucine synthesis pathway. Blocking poly-hydroxybutyrate biosynthesis resulted in significant accumulation of isoleucine and valine. Besides, strategies like key enzymes screening and overexpressing, reducing power balancing and feedback inhibition removing were applied in strain modification. Finally, the maximum isoleucine and valine titers of the best isoleucine-producing and valine-producing strains reached 857 and 972 mg/L, respectively, in fed-batch fermentation using glucose as substrate, and 105 and 319 mg/L, respectively, in autotrophic fermentation using CO2 as substrate. This study provides a feasible solution for developing C. necator as a microbial factory to produce amino acids from CO2.
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Affiliation(s)
- Lei Wang
- State Key Laboratory of Animal Nutrition and Feeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China; College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Junhu Yao
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Tao Tu
- State Key Laboratory of Animal Nutrition and Feeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Bin Yao
- State Key Laboratory of Animal Nutrition and Feeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China; College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Jie Zhang
- State Key Laboratory of Animal Nutrition and Feeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China.
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Ryu H, Nguyen CNM, Kuk Lee S, Park S. Development of Cupriavidus necator H16 as a host for heterologous production of formate dehydrogenase I of Methylorubrum extorquens: Possibilities and limitations. BIORESOURCE TECHNOLOGY 2024; 394:130187. [PMID: 38096999 DOI: 10.1016/j.biortech.2023.130187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 12/06/2023] [Accepted: 12/07/2023] [Indexed: 12/17/2023]
Abstract
The discovery of formate dehydrogenase (Me-FDH1) from Methylorubrum extorquens has provided an avenue for sustainable CO2 fixation and utilization. However, the mass production of Me-FDH1 is challenging due to the presence of its unique tungsto-bis-metalopterin guanine dinucleotide (W-bis-MGD) cofactor, limiting its practical applications. In this study, C. necator H16 is proposed as a host for the large-scale production of Me-FDH1, utilizing fructose as a carbon source and its inherent machinery for cofactor synthesis. In a minimal salt medium, C. necator H16 could produce active Me-FDH1, which exhibited a specific activity of 80 to 100 U/mg for CO2 conversion to formate. In fed batch bioreactor experiments, approximately 50 g CDW/L (cell dry weight/L) and 10,000 U/L Me-FDH1 were achieved within 50 h. This study highlights C. necator H16 as the recombinant host for Me-FDH1, paving the way for the future development of efficient mass-production methods for this crucial enzyme.
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Affiliation(s)
- Huichang Ryu
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Republic of Korea
| | | | - Sung Kuk Lee
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Republic of Korea
| | - Sunghoon Park
- School of Energy and Chemical Engineering, UNIST, Ulsan 44919, Republic of Korea.
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Arhar S, Rauter T, Stolterfoht-Stock H, Lambauer V, Kratzer R, Winkler M, Karava M, Kourist R, Emmerstorfer-Augustin A. CO 2-based production of phytase from highly stable expression plasmids in Cupriavidus necator H16. Microb Cell Fact 2024; 23:9. [PMID: 38172920 PMCID: PMC10763379 DOI: 10.1186/s12934-023-02280-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Accepted: 12/18/2023] [Indexed: 01/05/2024] Open
Abstract
BACKGROUND Existing plasmid systems offer a fundamental foundation for gene expression in Cupriavidus necator; however, their applicability is constrained by the limitations of conjugation. Low segregational stabilities and plasmid copy numbers, particularly in the absence of selection pressure, pose challenges. Phytases, recognized for their widespread application as supplements in animal feed to enhance phosphate availability, present an intriguing prospect for heterologous production in C. necator. The establishment of stable, high-copy number plasmid that can be electroporated would support the utilization of C. necator for the production of single-cell protein from CO2. RESULTS In this study, we introduce a novel class of expression plasmids specifically designed for electroporation. These plasmids contain partitioning systems to boost segregation stability, eliminating the need for selection pressure. As a proof of concept, we successfully produced Escherichia coli derived AppA phytase in C. necator H16 PHB- 4 using these improved plasmids. Expression was directed by seven distinct promoters, encompassing the constitutive j5 promoter, hydrogenase promoters, and those governing the Calvin-Benson-Bassham cycle. The phytase activities observed in recombinant C. necator H16 strains ranged from 2 to 50 U/mg of total protein, contingent upon the choice of promoter and the mode of cell cultivation - heterotrophic or autotrophic. Further, an upscaling experiment conducted in a 1 l fed-batch gas fermentation system resulted in the attainment of the theoretical biomass. Phytase activity reached levels of up to 22 U/ml. CONCLUSION The new expression system presented in this study offers a highly efficient platform for protein production and a wide array of synthetic biology applications. It incorporates robust promoters that exhibit either constitutive activity or can be selectively activated when cells transition from heterotrophic to autotrophic growth. This versatility makes it a powerful tool for tailored gene expression. Moreover, the potential to generate active phytases within C. necator H16 holds promising implications for the valorization of CO2 in the feed industry.
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Affiliation(s)
- Simon Arhar
- Austrian Centre of Industrial Biotechnology, acib GmbH, Krenngasse 37, Graz, 8010, Austria
| | - Thomas Rauter
- Austrian Centre of Industrial Biotechnology, acib GmbH, Krenngasse 37, Graz, 8010, Austria
| | | | - Vera Lambauer
- Austrian Centre of Industrial Biotechnology, acib GmbH, Krenngasse 37, Graz, 8010, Austria
- Institute of Biotechnology and Biochemical Engineering, Graz University of Technology, NAWI Graz, Petersgasse 12, Graz, 8010, Austria
| | - Regina Kratzer
- Austrian Centre of Industrial Biotechnology, acib GmbH, Krenngasse 37, Graz, 8010, Austria
- Institute of Biotechnology and Biochemical Engineering, Graz University of Technology, NAWI Graz, Petersgasse 12, Graz, 8010, Austria
| | - Margit Winkler
- Austrian Centre of Industrial Biotechnology, acib GmbH, Krenngasse 37, Graz, 8010, Austria
- Institute of Molecular Biotechnology, Graz University of Technology, NAWI Graz, Petersgasse 14, Graz, 8010, Austria
| | - Marianna Karava
- Institute of Molecular Biotechnology, Graz University of Technology, NAWI Graz, Petersgasse 14, Graz, 8010, Austria
| | - Robert Kourist
- Austrian Centre of Industrial Biotechnology, acib GmbH, Krenngasse 37, Graz, 8010, Austria
- Institute of Molecular Biotechnology, Graz University of Technology, NAWI Graz, Petersgasse 14, Graz, 8010, Austria
| | - Anita Emmerstorfer-Augustin
- Austrian Centre of Industrial Biotechnology, acib GmbH, Krenngasse 37, Graz, 8010, Austria.
- Institute of Molecular Biotechnology, Graz University of Technology, NAWI Graz, Petersgasse 14, Graz, 8010, Austria.
- BioTechMed-Graz, Graz, Austria.
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