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Yan Y, Shan W, Zhang C, Wu Y, Xing X, Chen J, Hu W. Strain engineering of Bacillus coagulans with high osmotic pressure tolerance for effective L-lactic acid production from sweet sorghum juice under unsterile conditions. BIORESOURCE TECHNOLOGY 2024; 400:130648. [PMID: 38561153 DOI: 10.1016/j.biortech.2024.130648] [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: 01/11/2024] [Revised: 03/29/2024] [Accepted: 03/29/2024] [Indexed: 04/04/2024]
Abstract
Open unsterile fermentation of the low-cost non-food crop, sweet sorghum, is an economically feasible lactic acid biosynthesis process. However, hyperosmotic stress inhibits microbial metabolism and lactic acid biosynthesis, and engineering strains with high osmotic tolerance is challenging. Herein, heavy ion mutagenesis combined with osmotic pressure enrichment was used to engineer a hyperosmotic-tolerant Bacillus coagulans for L-lactic acid production. The engineered strain had higher osmotic pressure tolerance, when compared with the parental strain, primarily owing to its improved properties such as cell viability, cellular antioxidant capacity, and NADH supply. In a pilot-scale open unsterile fermentation using sweet sorghum juice as a feedstock, the engineered strain produced 94 g/L L-lactic acid with a yield of 91 % and productivity of 6.7 g/L/h, and optical purity of L-lactic acid at the end of fermentation was 99.8 %. In short, this study provided effective and low-cost approach to produce polymer-grade L-lactic acid.
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Affiliation(s)
- Yongli Yan
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China; University of Chinese Academy of Sciences, Beijing, China
| | - Wenwen Shan
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China; University of Chinese Academy of Sciences, Beijing, China
| | - Chong Zhang
- Key Laboratory for Industrial Biocatalysis, Ministry of Education, Department of Chemical Engineering, Institute of Biochemical Engineering, Tsinghua University, Beijing, China; Center for Synthetic and Systems Biology, Tsinghua University, Beijing, China
| | - Yufan Wu
- College of Bioscience and Bioengineering, Jiangxi Agricultural University, Nanchang, China
| | - Xinhui Xing
- Key Laboratory for Industrial Biocatalysis, Ministry of Education, Department of Chemical Engineering, Institute of Biochemical Engineering, Tsinghua University, Beijing, China; Center for Synthetic and Systems Biology, Tsinghua University, Beijing, China; Institute of Biopharmaceutical and Health Engineering, Tsinghua Shenzhen International Graduate School, Shenzhen, China
| | - Jihong Chen
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China; University of Chinese Academy of Sciences, Beijing, China.
| | - Wei Hu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China; University of Chinese Academy of Sciences, Beijing, China.
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Wang Y, Qian J, Shi T, Wang Y, Ding Q, Ye C. Application of extremophile cell factories in industrial biotechnology. Enzyme Microb Technol 2024; 175:110407. [PMID: 38341913 DOI: 10.1016/j.enzmictec.2024.110407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 01/24/2024] [Accepted: 01/26/2024] [Indexed: 02/13/2024]
Abstract
Due to the extreme living conditions, extremophiles have unique characteristics in morphology, structure, physiology, biochemistry, molecular evolution mechanism and so on. Extremophiles have superior growth and synthesis capabilities under harsh conditions compared to conventional microorganisms, allowing for unsterilized fermentation processes and thus better performance in low-cost production. In recent years, due to the development and optimization of molecular biology, synthetic biology and fermentation technology, the identification and screening technology of extremophiles has been greatly improved. In this review, we summarize techniques for the identification and screening of extremophiles and review their applications in industrial biotechnology in recent years. In addition, the facts and perspectives gathered in this review suggest that next-generation industrial biotechnology (NGIBs) based on engineered extremophiles holds the promise of simplifying biofuturing processes, establishing open, non-sterilized continuous fermentation production systems, and utilizing low-cost substrates to make NGIBs attractive and cost-effective bioprocessing technologies for sustainable manufacturing.
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Affiliation(s)
- Yuzhou Wang
- School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, Nanjing 210023, PR China
| | - Jinyi Qian
- School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, Nanjing 210023, PR China
| | - Tianqiong Shi
- School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, Nanjing 210023, PR China
| | - Yuetong Wang
- School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, Nanjing 210023, PR China
| | - Qiang Ding
- School of Life Sciences, Anhui University, Hefei 230601, PR China.
| | - Chao Ye
- School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, Nanjing 210023, PR China; Ministry of Education Key Laboratory of NSLSCS.
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Teke GM, Gakingo GK, Pott RWM. The liquid-liquid extractive fermentation of L-lactic acid in a novel semi-partition bioreactor (SPB). J Biotechnol 2022; 360:55-61. [PMID: 36330925 DOI: 10.1016/j.jbiotec.2022.10.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 10/21/2022] [Accepted: 10/26/2022] [Indexed: 11/06/2022]
Abstract
Fermentation technology is commonly used as a mature process to produce numerous products with the help of micro-organisms. However, these organisms are sometimes inhibited by the accumulation of these products or their by-products. One route to circumvent this is via extractive fermentation, which combines the fermentation process with extraction. To facilitate this, novel bioreactor designs are required, such as the semi-partition bioreactor (SPB) which has been recently proposed for in-situ extractive fermentation. The latter combines a fermentation and an extraction unit into a single vessel using a mixer-settler principle. Where the bioproduct is produced in the mixer and removed continuous in the settler. As the SPB functionality is a subject of interest, this study builds on demonstrating different process conditions in the production of a sample bioprocess (lactic acid (LA)) which is susceptible to product inhibition. The results showed a 34.5 g/L LA concentration was obtained in the pH-controlled condition. While LA production can suffer from product inhibition, neutralizing agents can be easily used to curb inhibitory problems, however, the LA fermentation is a simple (and well-studied) example, which can demonstrate an alternative route to avoiding product inhibition (for systems which cannot be rescued using pH control). Hence, to replicate a scenario of product inhibition, two different process conditions were investigated, no pH control with no extraction (non-integrated), and no pH control with integrated extractive fermentation. Key findings showed higher LA concentration in integrated (25.10 g/L) as compared to the non-integrated (14.94 g/L) case with improved yield (0.75 gg-1 (integrated) versus 0.60 gg-1 (non-integrated)) and overall productivity (0.35 gL-1h-1(integrated) versus 0.20 gL-1h-1(non-integrated)) likewise. This is the first demonstration of an SP bioreactor, and shows how the reactor can be applied to improve productivity. Based on these results, the SPB design can be applied to produce any product liable to product inhibition.
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Affiliation(s)
- George M Teke
- Department of Process Engineering, Stellenbosch University, South Africa
| | - Godfrey K Gakingo
- Department of Process Engineering, Stellenbosch University, South Africa; Department of Chemical Engineering, Dedan Kimathi University of Technology, Kenya
| | - Robert W M Pott
- Department of Process Engineering, Stellenbosch University, South Africa.
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Baidurah S, Kobayashi T, Aziz AA. PLA Based Plastics for Enhanced Sustainability of the Environment. ENCYCLOPEDIA OF MATERIALS: PLASTICS AND POLYMERS 2022:511-519. [DOI: 10.1016/b978-0-12-820352-1.00175-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
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Teke GM, Tai SL, Pott RWM. Extractive Fermentation Processes: Modes of Operation and Application. CHEMBIOENG REVIEWS 2021. [DOI: 10.1002/cben.202100028] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- George M. Teke
- University of Stellenbosch Department of Process Engineering Stellenbosch South Africa
| | - Siew L. Tai
- University of Cape Town Department of Chemical Engineering Cape Town South Africa
| | - Robert W. M. Pott
- University of Stellenbosch Department of Process Engineering Stellenbosch South Africa
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Dorau R, Liu J, Solem C, Jensen PR. Metabolic Engineering of Lactic Acid Bacteria. Metab Eng 2021. [DOI: 10.1002/9783527823468.ch15] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Enhanced production of ε-poly-L-lysine by immobilized Streptomyces ahygroscopicus through repeated-batch or fed-batch fermentation with in situ product removal. Bioprocess Biosyst Eng 2021; 44:2109-2120. [PMID: 34047828 DOI: 10.1007/s00449-021-02587-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Accepted: 05/12/2021] [Indexed: 12/29/2022]
Abstract
ε-Poly-L-lysine (ε-PL) is a naturally-occurring L-lysine homopolymer having a broad-spectrum antimicrobial activity and used widely as a food preservative. In the present study, the combined use of immobilization and in situ product removal (ISPR) was evaluated for the production of ε-PL by Streptomyces ahygroscopicus GIM8. Results showed that ε-PL production in the flask cultures decreased from 0.84 to 0.38-0.56 g/L upon immobilization on loofah sponge with different amounts (0.5-3 g in 50 mL medium in a flask). By applying continuous ISPR to the immobilized flask cultures, ε-PL production as high as 3.51 g/L was obtained compared to 0.51 g/L of the control. A satisfactory titer of 1.84 g/L ε-PL could also be achieved with intermittent ISRP (three cycles of ISPR operation during cultivation). Further investigation showed that low levels of ε-PL retained in the broth appeared to favor its biosynthesis. In the repeated-batch fermentation in a 5 L immobilized bioreactor, with continuous ISPR, the final average ε-PL concentration and productivity were 3.35 g/L and 0.797 g/L/day, respectively, and 3.18 g/L and 0.756 g/L/day for the alternative (intermittent ISPR), in comparison to 1.16 g/L and 0.277 g/L/day with no ISPR usage. In the fed-batch fermentation with immobilized cells, the combined use of intermittent ISPR and extra nutrient feeding increased ε-PL concentration and productivity up to 24.57 g/L and 9.34 g/L/day. The fermentation processes developed could serve as an effective approach for ε-PL production and, moreover, the combination could greatly simplify downstream processing for ε-PL separation and purification.
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Enhancing acetic acid and 5‐hydroxymethyl furfural tolerance of C. saccharoperbutylacetonicum through adaptive laboratory evolution. Process Biochem 2021. [DOI: 10.1016/j.procbio.2020.11.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Zhang F, Liu J, Han X, Gao C, Ma C, Tao F, Xu P. Kinetic characteristics of long-term repeated fed-batch (LtRFb) l-lactic acid fermentation by a Bacillus coagulans strain. Eng Life Sci 2020; 20:562-570. [PMID: 33304229 PMCID: PMC7708950 DOI: 10.1002/elsc.202000043] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Application of degradable plastics is the most critical solution to plastic pollution. As the precursor of biodegradable plastic PLA (polylactic acid), efficient production of l-lactic acid is vital for the commercial replacement of traditional plastics. Bacillus coagulans H-2, a robust strain, was investigated for effective production of l-lactic acid using long-term repeated fed-batch (LtRFb) fermentation. Kinetic characteristics of l-lactic acid fermentation were analyzed by two models, showing that cell-growth coupled production gradually replaces cell-maintenance coupled production during fermentation. With the LtRFb strategy, l-lactic acid was produced at a high final concentration of 192.7 g/L, on average, and a yield of up to 93.0% during 20 batches of repeated fermentation within 487.5 h. Thus, strain H-2 can be used in the industrial production of l-lactic acid with optimization based on kinetic modeling.
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Affiliation(s)
- Fan Zhang
- State Key Laboratory of Microbial MetabolismJoint International Research Laboratory of Metabolic & Developmental Sciencesand School of Life Sciences & BiotechnologyShanghai Jiao Tong UniversityShanghaiP. R. China
| | - Jiongqin Liu
- State Key Laboratory of Microbial MetabolismJoint International Research Laboratory of Metabolic & Developmental Sciencesand School of Life Sciences & BiotechnologyShanghai Jiao Tong UniversityShanghaiP. R. China
| | - Xiao Han
- State Key Laboratory of Microbial MetabolismJoint International Research Laboratory of Metabolic & Developmental Sciencesand School of Life Sciences & BiotechnologyShanghai Jiao Tong UniversityShanghaiP. R. China
| | - Chao Gao
- State Key Laboratory of Microbial TechnologyShandong UniversityQingdaoP. R. China
| | - Cuiqing Ma
- State Key Laboratory of Microbial TechnologyShandong UniversityQingdaoP. R. China
| | - Fei Tao
- State Key Laboratory of Microbial MetabolismJoint International Research Laboratory of Metabolic & Developmental Sciencesand School of Life Sciences & BiotechnologyShanghai Jiao Tong UniversityShanghaiP. R. China
| | - Ping Xu
- State Key Laboratory of Microbial MetabolismJoint International Research Laboratory of Metabolic & Developmental Sciencesand School of Life Sciences & BiotechnologyShanghai Jiao Tong UniversityShanghaiP. R. China
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