1
|
Ma H, Liu Y, Zhao J, Fei F, Gao M, Wang Q. Explainable machine learning-driven predictive performance and process parameter optimization for caproic acid production. BIORESOURCE TECHNOLOGY 2024; 410:131311. [PMID: 39168415 DOI: 10.1016/j.biortech.2024.131311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2024] [Revised: 08/15/2024] [Accepted: 08/17/2024] [Indexed: 08/23/2024]
Abstract
In this study, four machine learning (ML) prediction models were developed to predict and optimize the production performance of caproic acid based on substrates, products, and process parameters. The XGBoost outperformed others, with a high R2 of 0.998 on the training set and 0.885 on the test set. Feature importance analysis revealed hydraulic retention time (HRT) and butyric acid concentration are decisive. The SHAP method offered profound insights into the interplay and cumulative effects of substrate composition, identified the synergistic effects between butyric acid and lactic acid, and emphasized adding glucose can benefit caproic with lactic acid co-fermentation. By integrating the Adaptive Variation Particle Swarm Optimization (AVPSO) algorithm, the optimal process conditions to achieve a maximum caproic acid production of 8.64 g/L was obtained. This study not only advances caproic acid production but contributes a versatile ML-driven strategy applicable to bioprocess optimizations, potentially transformative for sustainable and economically viable bioproduction.
Collapse
Affiliation(s)
- Hongzhi Ma
- Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, 100083, China; Xinjiang Key Laboratory of Clean Conversion and High Value Utilization of Biomass Resources, School of Resource and Environmental Science, Yili Normal University, Yining 835000, China.
| | - Yichan Liu
- Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, 100083, China
| | - Jihua Zhao
- Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, 100083, China
| | - Fan Fei
- Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, 100083, China
| | - Ming Gao
- Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, 100083, China
| | - Qunhui Wang
- Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, 100083, China
| |
Collapse
|
2
|
Lu P, Bai R, Gao T, Chen J, Jiang K, Zhu Y, Lu Y, Zhang S, Xu F, Zhao H. Systemic metabolic engineering of Enterobacter aerogenes for efficient 2,3-butanediol production. Appl Microbiol Biotechnol 2024; 108:146. [PMID: 38240862 PMCID: PMC10798932 DOI: 10.1007/s00253-023-12911-8] [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: 07/18/2023] [Revised: 11/05/2023] [Accepted: 11/14/2023] [Indexed: 01/22/2024]
Abstract
2,3-Butanediol (2,3-BDO) is an important gateway molecule for many chemical derivatives. Currently, microbial production is gradually being recognized as a green and sustainable alternative to petrochemical synthesis, but the titer, yield, and productivity of microbial 2,3-BDO remain suboptimal. Here, we used systemic metabolic engineering strategies to debottleneck the 2,3-BDO production in Enterobacter aerogenes. Firstly, the pyruvate metabolic network was reconstructed by deleting genes for by-product synthesis to improve the flux toward 2,3-BDO synthesis, which resulted in a 90% increase of the product titer. Secondly, the 2,3-BDO productivity of the IAM1183-LPCT/D was increased by 55% due to the heterologous expression of DR1558 which boosted cell resistance to abiotic stress. Thirdly, carbon sources were optimized to further improve the yield of target products. The IAM1183-LPCT/D showed the highest titer of 2,3-BDO from sucrose, 20% higher than that from glucose, and the yield of 2,3-BDO reached 0.49 g/g. Finally, the titer of 2,3-BDO of IAM1183-LPCT/D in a 5-L fermenter reached 22.93 g/L, 85% higher than the wild-type strain, and the titer of by-products except ethanol was very low. KEY POINTS: Deletion of five key genes in E. aerogenes improved 2,3-BDO production The titer of 2,3-BDO was increased by 90% by regulating metabolic flux Response regulator DR1558 was expressed to increase 2,3-BDO productivity.
Collapse
Affiliation(s)
- Ping Lu
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, 310018, China
| | - Ruoxuan Bai
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, 310018, China
| | - Ting Gao
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, 310018, China
| | - Jiale Chen
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, 310018, China
| | - Ke Jiang
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, 310018, China
| | - Yalun Zhu
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, 310018, China
| | - Ye Lu
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, 310018, China
| | - Shuting Zhang
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, 310018, China
| | - Fangxu Xu
- Liaoning Province Key Laboratory of Cordyceps Militaris With Functional Value, Experimental Teaching Center, Shenyang Normal University, Shenyang, 110034, China
| | - Hongxin Zhao
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, 310018, China.
| |
Collapse
|
3
|
Xie Y, Ye Z, Wan X, Deng H, Sun W, He X, Chen K. Screening of exopolysaccharide-producing Enterobacter aerogenes NJ1023 and its cadaverine biosynthesis promotion. Front Microbiol 2023; 14:1200123. [PMID: 37577413 PMCID: PMC10414541 DOI: 10.3389/fmicb.2023.1200123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 07/12/2023] [Indexed: 08/15/2023] Open
Abstract
Enterobacter aerogenes, the gram-negative bacteria belonging to the family Enterobacteriaceae, lacks the ability to synthesize chemicals. However, in this study, a strain of Enterobacter aerogenes NJ1023 screened from the soil containing petrochemicals was found to be capable of producing extracellular polysaccharides (EPSs). After purification of the polysaccharide, the chemical composition and physicochemical properties of the polysaccharide were analyzed by UV-Vis spectra, FTIR spectroscopy and GC-MS, etc. The results showed that: The molecular weight of the polysaccharide produced by this strain was only 2.7×103 Da, which was lower than that reported in other polysaccharides from the same genus. The polysaccharide produced by E. aerogenes NJ1023 mainly comprised xylose, glucose, galactose, and N-acetylglucosamine with a molar ratio of 0.27: 4.52: 1.74: 0.2, which differed from those reported from the same genus. The results demonstrated that lower incubation temperatures and shaking speeds were more favorable for EPSs synthesis, while higher incubation temperatures and shaking speeds favored cell growth. Additionally, the EPSs produced by E. aerogenes NJ1023 significantly protected the Escherichia coli cells against cadaverine stress. Overall, the discovery of EPSs produced by E. aerogenes increased the diversity of bacterial polysaccharides and broadened the potential applications of this species.
Collapse
Affiliation(s)
| | | | | | | | | | - Xun He
- State Key Laboratory of Materials Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical, Nanjing Tech University, Nanjing, China
| | | |
Collapse
|
4
|
Engineering Microorganisms to Produce Bio-Based Monomers: Progress and Challenges. FERMENTATION-BASEL 2023. [DOI: 10.3390/fermentation9020137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Bioplastics are polymers made from sustainable bio-based feedstocks. While the potential of producing bio-based monomers in microbes has been investigated for decades, their economic feasibility is still unsatisfactory compared with petroleum-derived methods. To improve the overall synthetic efficiency of microbial cell factories, three main strategies were summarized in this review: firstly, implementing approaches to improve the microbial utilization ability of cheap and abundant substrates; secondly, developing methods at enzymes, pathway, and cellular levels to enhance microbial production performance; thirdly, building technologies to enhance microbial pH, osmotic, and metabolites stress tolerance. Moreover, the challenges of, and some perspectives on, exploiting microorganisms as efficient cell factories for producing bio-based monomers are also discussed.
Collapse
|
5
|
Lu P, Gao T, Bai R, Yang J, Xu Y, Chu W, Jiang K, Zhang J, Xu F, Zhao H. Regulation of carbon flux and NADH/NAD + supply to enhance 2,3-butanediol production in Enterobacter aerogenes. J Biotechnol 2022; 358:67-75. [PMID: 36087783 DOI: 10.1016/j.jbiotec.2022.09.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Revised: 08/23/2022] [Accepted: 09/05/2022] [Indexed: 10/31/2022]
Abstract
As a valuable platform chemical, 2,3-Butanediol (2,3-BDO) has a variety of industrial applications, and its microbial production is particularly attractive as an alternative to petroleum-based production. In this study, the regulation of intracellular carbon flux and NADH/NAD+ was used to increase the 2,3-BDO production of Enterobacter aerogenes. The genes encoding lactate dehydrogenase (ldh) and pyruvate formate lyase (pfl) were disrupted using the λ-Red recombination method and CRISPR-Cas9 to reduce the production of several byproducts and the consumption of NADH. Knockout of ldh or pfl increased intracellular NADH/NAD+ by 111 % and 113 %, respectively. Moreover, two important genes in the 2,3-BDO biosynthesis pathway, acetolactate synthase (budB) and acetoin reductase (budC), were overexpressed in E. aerogenes to further amply the metabolic flux toward 2,3-BDO production. And the overexpression of budB or budC increased intracellular NADH/NAD+ by 46 % and 57 %, respectively. In shake-flask cultivation with sucrose as carbon source, the 2,3-BDO titer of the IAM1183-LPBC was 3.55 times that of the wild type. In the 5-L fermenter, the maximal 2,3-BDO production produced by the IAM1183-LPBC was 2.88 times that of the original strain. This work offers new ideas for promoting the biosynthesis of 2,3-BDO for industrial applications.
Collapse
Affiliation(s)
- Ping Lu
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Ting Gao
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Ruoxuan Bai
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Jiayao Yang
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Yudong Xu
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Wanying Chu
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Ke Jiang
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Jingya Zhang
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Fangxu Xu
- Liaoning Province Key Laboratory of Cordyceps Militaris with Functional Value, Experimental Teaching Center, Shenyang Normal University, Shenyang 110034, China
| | - Hongxin Zhao
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China.
| |
Collapse
|
6
|
Guo H, Liu H, Jin Y, Zhang R, Yu Y, Deng L, Wang F. Advances in research on the bio-production of 1,4-butanediol by the engineered microbes. Biochem Eng J 2022. [DOI: 10.1016/j.bej.2022.108478] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
|
7
|
Su HY, Lin WH, Liang YL, Chou HH, Wu SW, Shi HL, Chen JY, Cheng KK. Co-production of acetoin and succinic acid using corncob hydrolysate by engineered Enterobacter cloacae. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2022.117511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
8
|
Wu Y, Chu W, Yang J, Xu Y, Shen Q, Yang H, Xu F, Liu Y, Lu P, Jiang K, Zhao H. Metabolic Engineering of Enterobacter aerogenes for Improved 2,3-Butanediol Production by Manipulating NADH Levels and Overexpressing the Small RNA RyhB. Front Microbiol 2021; 12:754306. [PMID: 34691005 PMCID: PMC8531500 DOI: 10.3389/fmicb.2021.754306] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Accepted: 09/16/2021] [Indexed: 11/29/2022] Open
Abstract
Biotechnological production of 2,3-butanediol (2,3-BD), a versatile platform bio-chemical and a potential biofuel, is limited due to by-product toxicity. In this study, we aimed to redirect the metabolic flux toward 2,3-BD in Enterobacter aerogenes (E. aerogenes) by increasing the intracellular NADH pool. Increasing the NADH/NAD+ ratio by knocking out the NADH dehydrogenase genes (nuoC/nuoD) enhanced 2,3-BD production by up to 67% compared with wild-type E. aerogenes. When lactate dehydrogenase (ldh) was knocked out, the yield of 2,3-BD was increased by 71.2% compared to the wild type. Metabolic flux analysis revealed that upregulated expression of the sRNA RyhB led to a noteworthy shift in metabolism. The 2,3-BD titer of the best mutant Ea-2 was almost seven times higher than that of the parent strain in a 5-L fermenter. In this study, an effective metabolic engineering strategy for improved 2,3-BD production was implemented by increasing the NADH/NAD+ ratio and blocking competing pathways.
Collapse
Affiliation(s)
- Yan Wu
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, China
- Key Laboratory of Urban Agriculture by Ministry of Agriculture of China, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
| | - Wanying Chu
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, China
| | - Jiayao Yang
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, China
| | - Yudong Xu
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, China
| | - Qi Shen
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, China
| | - Haoning Yang
- Department of Bioengineering, Liaoning Technical University, Fuxin, China
| | - Fangxu Xu
- Experimental Teaching Center, College of Life Science, Shenyang Normal University, Shenyang, China
| | - Yefei Liu
- Experimental Teaching Center, College of Life Science, Shenyang Normal University, Shenyang, China
| | - Ping Lu
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, China
| | - Ke Jiang
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, China
| | - Hongxin Zhao
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, China
| |
Collapse
|
9
|
Maina S, Prabhu AA, Vivek N, Vlysidis A, Koutinas A, Kumar V. Prospects on bio-based 2,3-butanediol and acetoin production: Recent progress and advances. Biotechnol Adv 2021; 54:107783. [PMID: 34098005 DOI: 10.1016/j.biotechadv.2021.107783] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 05/27/2021] [Accepted: 06/02/2021] [Indexed: 11/19/2022]
Abstract
The bio-based platform chemicals 2,3-butanediol (BDO) and acetoin have various applications in chemical, cosmetics, food, agriculture, and pharmaceutical industries, whereas the derivatives of BDO could be used as fuel additives, polymer and synthetic rubber production. This review summarizes the novel technological developments in adapting genetic and metabolic engineering strategies for selection and construction of chassis strains for BDO and acetoin production. The valorization of renewable feedstocks and bioprocess development for the upstream and downstream stages of bio-based BDO and acetoin production are discussed. The techno-economic aspects evaluating the viability and industrial potential of bio-based BDO production are presented. The commercialization of bio-based BDO and acetoin production requires the utilization of crude renewable resources, the chassis strains with high fermentation production efficiencies and development of sustainable purification or conversion technologies.
Collapse
Affiliation(s)
- Sofia Maina
- Department of Food Science and Human Nutrition, Agricultural University of Athens, Iera Odos, 75, 11855 Athens, Greece
| | - Ashish A Prabhu
- Centre for Climate and Environmental Protection, School of Water, Energy and Environment, Cranfield University, Cranfield MK43 0AL, UK
| | - Narisetty Vivek
- Centre for Climate and Environmental Protection, School of Water, Energy and Environment, Cranfield University, Cranfield MK43 0AL, UK
| | - Anestis Vlysidis
- Department of Food Science and Human Nutrition, Agricultural University of Athens, Iera Odos, 75, 11855 Athens, Greece
| | - Apostolis Koutinas
- Department of Food Science and Human Nutrition, Agricultural University of Athens, Iera Odos, 75, 11855 Athens, Greece.
| | - Vinod Kumar
- Centre for Climate and Environmental Protection, School of Water, Energy and Environment, Cranfield University, Cranfield MK43 0AL, UK.
| |
Collapse
|
10
|
Tinôco D, Pateraki C, Koutinas AA, Freire DMG. Bioprocess Development for 2,3‐Butanediol Production by
Paenibacillus
Strains. CHEMBIOENG REVIEWS 2021. [DOI: 10.1002/cben.202000022] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Daniel Tinôco
- Federal University of Rio de Janeiro, Cidade Universitária, Centro de Tecnologia Chemical Engineering Program, PEQ/COPPE Bloco G 21941-909 Rio de Janeiro Brazil
| | - Chrysanthi Pateraki
- Agricultural University of Athens Department of Food Science and Human Nutrition Iera Odos 75 Athens Greece
| | - Apostolis A. Koutinas
- Agricultural University of Athens Department of Food Science and Human Nutrition Iera Odos 75 Athens Greece
| | - Denise M. G. Freire
- Federal University of Rio de Janeiro, Cidade Universitária, Centro de Tecnologia Biochemistry Department, Chemistry Institute Bloco A, Lab 549 21941-909 Rio de Janeiro Brazil
| |
Collapse
|
11
|
Hong Y, Wu YR. Acidolysis as a biorefinery approach to producing advanced bioenergy from macroalgal biomass: A state-of-the-art review. BIORESOURCE TECHNOLOGY 2020; 318:124080. [PMID: 32927316 DOI: 10.1016/j.biortech.2020.124080] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Revised: 08/30/2020] [Accepted: 09/01/2020] [Indexed: 06/11/2023]
Abstract
Facing fossil fuels consumption and its accompanying environmental pollution, macroalgae, as a major part of the third-generation (3G) biomass, has great potential for bioenergy development due to its species-abundant, renewable and carbohydrate-rich properties. Diluted acid treatment is one of the most effective approaches to releasing fermentable sugars from macroalgal biomass in a short period, but the optimal conditions need to be explored to maximize the hydrolytic yield for the subsequent microbial conversion. Therefore, this review aims to summarize the latest advances in various acids and other auxiliary methods adopted to increase the hydrolytic efficiency of macroalgae. Following an overview of the strategies of different algal types, methods involved in the bioconversion of biofuels and microbial fuel cells (MFC) from algal hydrolysates are also described. For the 3G biorefinery development, the review further discusses key challenges and trends for future utilizing marine biomass to achieve the large-scale industrial production.
Collapse
Affiliation(s)
- Ying Hong
- Department of Biology, Shantou University, Shantou, Guangdong 515063, China
| | - Yi-Rui Wu
- Department of Biology, Shantou University, Shantou, Guangdong 515063, China; Guangdong Provincial Key Laboratory of Marine Biotechnology, Shantou University, Shantou, Guangdong 515063, China; Institute of Marine Sciences, Shantou University, Shantou, Guangdong 515063, China.
| |
Collapse
|
12
|
Szczerba H, Komoń-Janczara E, Dudziak K, Waśko A, Targoński Z. A novel biocatalyst, Enterobacter aerogenes LU2, for efficient production of succinic acid using whey permeate as a cost-effective carbon source. BIOTECHNOLOGY FOR BIOFUELS 2020; 13:96. [PMID: 32514308 PMCID: PMC7257193 DOI: 10.1186/s13068-020-01739-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Accepted: 05/22/2020] [Indexed: 06/11/2023]
Abstract
BACKGROUND Succinic acid (SA), a valuable chemical compound with a broad range of industrial uses, has become a subject of global interest in recent years. The bio-based production of SA by highly efficient microbial producers from renewable feedstock is significantly important, regarding the current trend of sustainable development. RESULTS In this study, a novel bacterial strain, LU2, was isolated from cow rumen and recognized as an efficient producer of SA from lactose. Proteomic and genetic identifications as well as phylogenetic analysis were performed, and strain LU2 was classified as an Enterobacter aerogenes species. The optimal conditions for SA production were 100 g/L lactose, 10 g/L yeast extract, and 20% inoculum at pH 7.0 and 34 °C. Under these conditions, approximately 51.35 g/L SA with a yield of 53% was produced when batch fermentation was conducted in a 3-L stirred bioreactor. When lactose was replaced with whey permeate, the highest SA concentration of 57.7 g/L was achieved with a yield and total productivity of 62% and 0.34 g/(L*h), respectively. The highest productivity of 0.67 g/(L*h) was observed from 48 to 72 h of batch fermentation, when E. aerogenes LU2 produced 16.23 g/L SA. CONCLUSIONS This study shows that the newly isolated strain E. aerogenes LU2 has great potential as a new biocatalyst for producing SA from whey permeate.
Collapse
Affiliation(s)
- Hubert Szczerba
- Department of Biotechnology, Microbiology and Human Nutrition, University of Life Sciences in Lublin, 8 Skromna Street, 20-704 Lublin, Poland
| | - Elwira Komoń-Janczara
- Department of Biotechnology, Microbiology and Human Nutrition, University of Life Sciences in Lublin, 8 Skromna Street, 20-704 Lublin, Poland
| | - Karolina Dudziak
- Chair and Department of Biochemistry and Molecular Biology, Medical University of Lublin, 1 Chodźki Street, 20-093 Lublin, Poland
| | - Adam Waśko
- Department of Biotechnology, Microbiology and Human Nutrition, University of Life Sciences in Lublin, 8 Skromna Street, 20-704 Lublin, Poland
| | - Zdzisław Targoński
- Department of Biotechnology, Microbiology and Human Nutrition, University of Life Sciences in Lublin, 8 Skromna Street, 20-704 Lublin, Poland
| |
Collapse
|