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Xin WG, Li XD, Zhou HY, Li X, Liu WX, Lin LB, Wang F. Isolation, antibacterial characterization, and alternating tangential flow-based preparation of viable cells of Lacticaseibacillus paracasei XLK 401: Potential application in milk preservation. J Dairy Sci 2024; 107:1355-1369. [PMID: 37776999 DOI: 10.3168/jds.2023-23622] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2023] [Accepted: 09/08/2023] [Indexed: 10/02/2023]
Abstract
It is desirable to obtain high levels of viable Lacticaseibacillus paracasei, a widely used food probiotic whose antibacterial activity and potential application in milk remain largely uninvestigated. Here, we isolated and purified the L. paracasei strain XLK 401 from food-grade blueberry ferments and found that it exhibited strong antibacterial activity against both gram-positive and gram-negative foodborne pathogens, including Staphylococcus aureus, Salmonella paratyphi B, Escherichia coli O157, and Shigella flexneri. Then, we applied alternating tangential flow (ATF) technology to produce viable L. paracasei XLK 401 cells and its cell-free supernatant (CFS). Compared with the conventional fed-batch method, 22 h of ATF-based processing markedly increased the number of viable cells of L. paracasei XLK 401 to 12.14 ± 0.13 log cfu/mL. Additionally, the CFS exhibited good thermal stability and pH tolerance, inhibiting biofilm formation in the abovementioned foodborne pathogens. According to liquid chromatography-mass spectrometry analysis, organic acids were the main antibacterial components of XLK 401 CFS, accounting for its inhibition activity. Moreover, the CFS of L. paracasei XLK 401 effectively inhibited the growth of multidrug-resistant gram-positive Staph. aureus and gram-negative E. coli O157 pathogens in milk, and caused a reduction in the pathogenic cell counts by 6 to 7 log cfu/mL compared with untreated control, thus considerably maintaining the safety of milk samples. For the first time to our knowledge, ATF-based technology was employed to obtain viable L. paracasei on a large scale, and its CFS could serve as a broad-spectrum biopreservative for potential application against foodborne pathogens in milk products.
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Affiliation(s)
- Wei-Gang Xin
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Yunnan, Kunming, 650500, China; Engineering Research Center for Replacement Technology of Feed Antibiotics of Yunnan College, Yunnan, Kunming, 650500, China
| | - Xin-Dong Li
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Yunnan, Kunming, 650500, China; Engineering Research Center for Replacement Technology of Feed Antibiotics of Yunnan College, Yunnan, Kunming, 650500, China
| | - Huan-Yu Zhou
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Yunnan, Kunming, 650500, China; Engineering Research Center for Replacement Technology of Feed Antibiotics of Yunnan College, Yunnan, Kunming, 650500, China
| | - Xin Li
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Yunnan, Kunming, 650500, China; Engineering Research Center for Replacement Technology of Feed Antibiotics of Yunnan College, Yunnan, Kunming, 650500, China
| | - Wei-Xin Liu
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Yunnan, Kunming, 650500, China; Engineering Research Center for Replacement Technology of Feed Antibiotics of Yunnan College, Yunnan, Kunming, 650500, China
| | - Lian-Bing Lin
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Yunnan, Kunming, 650500, China; Engineering Research Center for Replacement Technology of Feed Antibiotics of Yunnan College, Yunnan, Kunming, 650500, China.
| | - Feng Wang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Yunnan, Kunming, 650500, China; Engineering Research Center for Replacement Technology of Feed Antibiotics of Yunnan College, Yunnan, Kunming, 650500, China.
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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]
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Zhou S, Lama S, Sankaranarayanan M, Park S. Metabolic engineering of Pseudomonas denitrificans for the 1,3-propanediol production from glycerol. BIORESOURCE TECHNOLOGY 2019; 292:121933. [PMID: 31404755 DOI: 10.1016/j.biortech.2019.121933] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 07/27/2019] [Accepted: 07/29/2019] [Indexed: 06/10/2023]
Abstract
Bio-production of 1,3-propanediol (1,3-PDO) from glycerol was studied using Pseudomonas denitrificans as host, which aerobically synthesizes coenzyme B12, an essential cofactor of glycerol dehydratase (GDHt). P. denitrificans was transformed with the 1,3-PDO synthesis pathway composed of GDHt and 1,3-PDO oxidoreductase (PDOR), and its putative 3-hydroxypropionaldehyde (3-HPA) dehydrogenase(s), leading to the production of 3-hydroxypropioninc acid form the intermediary 3-HPA, was identified and deleted. In addition, to improve the availability of NADH for PDOR, oxidation of NADH in the electron transport chain was disturbed by deletion of the nuo operon and/or ndh gene. Finally, acetate formation pathway was eliminated. One resulting strain could produce 68.95 mM 1,3-PDO with the yield of 0.92 mol 1,3-PDO/mol glycerol on flask scale and 440 mM with the yield of 0.89 mol 1,3-PDO/mol glycerol in a fed-batch bioreactor experiment. This study demonstrates that P. denitrificans is a promising recombinant host for the production of 1,3-PDO from glycerol.
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Affiliation(s)
- Shengfang Zhou
- The Key Laboratory of Biotechnology for Medicinal Plant of Jiangsu Province, School of Life Sciences, Jiangsu Normal University, Xuzhou 221116, China; School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea
| | - Suman Lama
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea
| | - Mugesh Sankaranarayanan
- Department of Biotechnology, Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology, Avadi, Chennai 600062, India
| | - Sunghoon Park
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea.
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Yuan K, Song P, Li S, Gao S, Wen J, Huang H. Combining metabolic flux analysis and adaptive evolution to enhance lipase production in Bacillus subtilis. ACTA ACUST UNITED AC 2019; 46:1091-1101. [DOI: 10.1007/s10295-019-02205-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2018] [Accepted: 12/31/2018] [Indexed: 11/24/2022]
Abstract
Abstract
Metabolic fluxes during lipase production by Bacillus subtilis CICC 20034 in synthetic medium were studied using metabolic flux analysis (MFA). The MFA showed that lipase production was dependent on, and coupled to the tributyrin uptake rate, formation of biomass, lactate, ATP, as well as amino acids from the aspartate and glutamate family. Using tributyrin as the sole carbon source, an adaptive evolution strategy was applied to increase the tributyrin uptake rate. B. subtilis SPZ1 was obtained from CICC 20034 by adaptive evolution over 1000 generations of growth-based selection. The tributyrin consumption rate of strain SPZ1 reached 0.89 g/(L·h) which was 1.9-fold higher than that of the original strain. The MFA indicated that the 212% increase of tributyrin uptake flux contributed to the 556% increase of lipase flux. Consequently, the lipase activity (0.65 U/mL) of strain SPZ1 was 1.9-fold higher than that of the original strain. This was the highest lipase activity obtained by fermentation in synthetic medium reported for Bacillus strains. In complex culture medium, lipase activity of SPZ1 reached 3.3 U/mL.
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Affiliation(s)
- Kai Yuan
- 0000 0000 9389 5210 grid.412022.7 Jiangsu Synergetic Innovation Center for Advanced Bio-Manufacture, College of Biotechnology and Pharmaceutical Engineering Nanjing Tech University 211816 Nanjing China
| | - Ping Song
- 0000 0000 9389 5210 grid.412022.7 Jiangsu Synergetic Innovation Center for Advanced Bio-Manufacture, College of Biotechnology and Pharmaceutical Engineering Nanjing Tech University 211816 Nanjing China
- 0000 0004 1761 2484 grid.33763.32 Department Biochemical Engineering, School of Chemical Engineering and Technology Tianjin University 300072 Tianjin China
| | - Shuang Li
- 0000 0000 9389 5210 grid.412022.7 Jiangsu Synergetic Innovation Center for Advanced Bio-Manufacture, College of Biotechnology and Pharmaceutical Engineering Nanjing Tech University 211816 Nanjing China
| | - Song Gao
- 0000 0004 1800 0658 grid.443480.f Jiangsu Key Laboratory of Marine Bioresources and Environment Huaihai Institute of Technology 222005 Lianyungang China
| | - Jianping Wen
- 0000 0004 1761 2484 grid.33763.32 Department Biochemical Engineering, School of Chemical Engineering and Technology Tianjin University 300072 Tianjin China
| | - He Huang
- 0000 0000 9389 5210 grid.412022.7 School of Pharmaceutical Sciences Nanjing Tech University 211816 Nanjing China
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Huang J, Wu Y, Wu W, Zhang Y, Liu D, Chen Z. Cofactor recycling for co-production of 1,3-propanediol and glutamate by metabolically engineered Corynebacterium glutamicum. Sci Rep 2017; 7:42246. [PMID: 28176878 PMCID: PMC5296756 DOI: 10.1038/srep42246] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Accepted: 01/05/2017] [Indexed: 01/03/2023] Open
Abstract
Production of 1,3-propanediol (1,3-PDO) from glycerol is a promising route toward glycerol biorefinery. However, the yield of 1,3-PDO is limited due to the requirement of NADH regeneration via glycerol oxidation process, which generates large amounts of undesired byproducts. Glutamate fermentation by Corynebacterium glutamicum is an important oxidation process generating excess NADH. In this study, we proposed a novel strategy to couple the process of 1,3-PDO synthesis with glutamate production for cofactor regeneration. With the optimization of 1,3-PDO synthesis route, C. glutamicum can efficiently convert glycerol into 1,3-PDO with the yield of ~ 1.0 mol/mol glycerol. Co-production of 1,3-PDO and glutamate was also achieved which increased the yield of glutamate by 18% as compared to the control. Since 1,3-PDO and glutamate can be easily separated in downstream process, this study provides a potential green route for coupled production of 1,3-PDO and glutamate to enhance the economic viability of biorefinery process.
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Affiliation(s)
- Jinhai Huang
- Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Yao Wu
- Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Wenjun Wu
- Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Ye Zhang
- Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Dehua Liu
- Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.,Tsinghua Innovation Center in Dongguan, Dongguan 523808, China
| | - Zhen Chen
- Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.,Tsinghua Innovation Center in Dongguan, Dongguan 523808, China
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Chen Z, Wu Y, Huang J, Liu D. Metabolic engineering of Klebsiella pneumoniae for the de novo production of 2-butanol as a potential biofuel. BIORESOURCE TECHNOLOGY 2015; 197:260-5. [PMID: 26342337 DOI: 10.1016/j.biortech.2015.08.086] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Revised: 08/14/2015] [Accepted: 08/17/2015] [Indexed: 05/14/2023]
Abstract
Butanol isomers are important bulk chemicals and promising fuel substitutes. The inevitable toxicity of n-butanol and isobutanol to microbial cells hinders their final titers. In this study, we attempt to engineer Klebsiella pneumoniae for the de novo production of 2-butanol, another butanol isomer which shows lower toxicity than n-butanol and isobutanol. 2-Butanol synthesis was realized by the extension of the native meso-2,3-butanediol synthesis pathway with the introduction of diol dehydratase and secondary alcohol dehydrogenase. By the screening of different secondary alcohol dehydrogenases and diol dehydratases, 320mg/L of 2-butanol was produced by the best engineered K. pneumoniae. The production was increased to 720mg/L by knocking out the ldhA gene and appropriate addition of coenzyme B12. Further improvement of 2-butanol to 1030mg/L was achieved by protein engineering of diol dehydratase. This work lays the basis for the metabolic engineering of microorganism for the production of 2-butanol as potential biofuel.
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Affiliation(s)
- Zhen Chen
- Institute of Applied Chemistry, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China; Tsinghua Innovation Center in Dongguan, Dongguan 523808, China.
| | - Yao Wu
- Institute of Applied Chemistry, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Jinhai Huang
- Institute of Applied Chemistry, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Dehua Liu
- Institute of Applied Chemistry, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China; Tsinghua Innovation Center in Dongguan, Dongguan 523808, China
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Chen Z, Sun H, Huang J, Wu Y, Liu D. Metabolic Engineering of Klebsiella pneumoniae for the Production of 2-Butanone from Glucose. PLoS One 2015; 10:e0140508. [PMID: 26465746 PMCID: PMC4605612 DOI: 10.1371/journal.pone.0140508] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Accepted: 09/25/2015] [Indexed: 11/27/2022] Open
Abstract
2-Butanone is an important commodity chemical of wide application in different areas. In this study, Klebsiella pneumoniae was engineered to directly produce 2-butanone from glucose by extending its native 2, 3-butanediol synthesis pathway. To identify the potential enzyme for the efficient conversion of 2, 3-butanediol to 2-butanone, we screened different glycerol dehydratases and diol dehydratases. By introducing the diol dehydratase from Lactobacillus brevis and deleting the ldhA gene encoding lactate dehydrogenase, the engineered K. pneumoniae was able to accumulate 246 mg/L of 2-butanone in shake flask. With further optimization of culture condition, the titer of 2-butanone was increased to 450 mg/L. This study lays the basis for developing an efficient biological process for 2-butanone production.
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Affiliation(s)
- Zhen Chen
- Institute of Applied Chemistry, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
- Tsinghua Innovation Center in Dongguan, Dongguan 523808, China
- * E-mail:
| | - He Sun
- Institute of Applied Chemistry, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Jinhai Huang
- Institute of Applied Chemistry, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Yao Wu
- Institute of Applied Chemistry, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Dehua Liu
- Institute of Applied Chemistry, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
- Tsinghua Innovation Center in Dongguan, Dongguan 523808, China
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Improvement of 2,3-butanediol yield in Klebsiella pneumoniae by deletion of the pyruvate formate-lyase gene. Appl Environ Microbiol 2014; 80:6195-203. [PMID: 25085487 DOI: 10.1128/aem.02069-14] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Klebsiella pneumoniae is considered a good host strain for the production of 2,3-butanediol, which is a promising platform chemical with various industrial applications. In this study, three genes, including those encoding glucosyltransferase (wabG), lactate dehydrogenase (ldhA), and pyruvate formate-lyase (pflB), were disrupted in K. pneumoniae to reduce both its pathogenic characteristics and the production of several by-products. In flask cultivation with minimal medium, the yield of 2,3-butanediol from rationally engineered K. pneumoniae (ΔwabG ΔldhA ΔpflB) reached 0.461 g/g glucose, which was 92.2% of the theoretical maximum, with a significant reduction in by-product formation. However, the growth rate of the pflB mutant was slightly reduced compared to that of its parental strain. Comparison with similar mutants of Escherichia coli suggested that the growth defect of pflB-deficient K. pneumoniae was caused by redox imbalance rather than reduced level of intracellular acetyl coenzyme A (acetyl-CoA). From an analysis of the transcriptome, it was confirmed that the removal of pflB from K. pneumoniae significantly repressed the expression of genes involved in the formate hydrogen lyase (FHL) system.
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Yen HW, Li FT, Chang JS. The effects of dissolved oxygen level on the distribution of 1,3-propanediol and 2,3-butanediol produced from glycerol by an isolated indigenous Klebsiella sp. Ana-WS5. BIORESOURCE TECHNOLOGY 2014; 153:374-8. [PMID: 24369989 DOI: 10.1016/j.biortech.2013.12.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2013] [Revised: 11/28/2013] [Accepted: 12/01/2013] [Indexed: 05/03/2023]
Abstract
The rapid accumulation of glycerol during biodiesel synthesis has attracted much interest on the potential usage. One of the promising applications is the conversion of glycerol to 1,3-propanediol (PDO), as well 2,3-butanediol (BDO), by using Klebsiella pneumonia. The results of this study indicate that the dissolved oxygen level (DO) is a determining factor in the distribution of PDO and BDO. The batch with a low DO could achieve a much higher PDO/BDO ratio than the high DO batch, with results of 9.9 and 0.2, respectively. The enzyme activity of glycerol dehydratase (GDHt) in the low DO batch was about three times that of the high DO batch, and this might be the cause of the enhanced PDO production. In conclusion, the results of this work show that high DO was beneficial to the production of BDO when using glycerol as the carbon source, while low DO could enhance PDO production.
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Affiliation(s)
- Hong-Wei Yen
- Department of Chemical and Materials Engineering, Tunghai University, Taichung 407, Taiwan.
| | - Fang-Tzu Li
- Department of Chemical and Materials Engineering, Tunghai University, Taichung 407, Taiwan
| | - Jo-Shu Chang
- Department of Chemical Engineering, National Cheng Kung University, Tainan 701, Taiwan; Research Center for Energy Technology and Strategy, National Cheng Kung University, Tainan 701, Taiwan; University Center for Bioscience and Biotechnology, National Cheng Kung University, Tainan 701, Taiwan
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Thapa LP, Lee SJ, Yoo HY, Choi HS, Park C, Kim SW. Development of glycerol-utilizing Escherichia coli strain for the production of bioethanol. Enzyme Microb Technol 2013; 53:206-15. [DOI: 10.1016/j.enzmictec.2013.04.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Revised: 04/20/2013] [Accepted: 04/25/2013] [Indexed: 10/26/2022]
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Park JM, Song H, Lee HJ, Seung D. In silico aided metabolic engineering of Klebsiella oxytoca and fermentation optimization for enhanced 2,3-butanediol production. J Ind Microbiol Biotechnol 2013; 40:1057-66. [PMID: 23779220 DOI: 10.1007/s10295-013-1298-y] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2013] [Accepted: 05/29/2013] [Indexed: 10/26/2022]
Abstract
Klebsiella oxytoca naturally produces a large amount of 2,3-butanediol (2,3-BD), a promising bulk chemical with wide industrial applications, along with various byproducts. In this study, the in silico gene knockout simulation of K. oxytoca was carried out for 2,3-BD overproduction by inhibiting the formation of byproducts. The knockouts of ldhA and pflB genes were targeted with the criteria of maximization of 2,3-BD production and minimization of byproducts formation. The constructed K. oxytoca ΔldhA ΔpflB strain showed higher 2,3-BD yields and higher final concentrations than those obtained from the wild-type and ΔldhA strains. However, the simultaneous deletion of both genes caused about a 50 % reduction in 2,3-BD productivity compared with K. oxytoca ΔldhA strain. Based on previous studies and in silico investigation that the agitation speed during 2,3-BD fermentation strongly affected cell growth and 2,3-BD synthesis, the effect of agitation speed on 2,3-BD production was investigated from 150 to 450 rpm in 5-L bioreactors containing 3-L culture media. The highest 2,3-BD productivity (2.7 g/L/h) was obtained at 450 rpm in batch fermentation. Considering the inhibition of acetoin for 2,3-BD production, fed-batch fermentations were performed using K. oxytoca ΔldhA ΔpflB strain to enhance 2,3-BD production. Altering the agitation speed from 450 to 350 rpm at nearly 10 g/L of acetoin during the fed-batch fermentation allowed for the production of 113 g/L 2,3-BD, with a yield of 0.45 g/g, and for the production of 2.1 g/L/h of 2,3-BD.
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Affiliation(s)
- Jong Myoung Park
- Research and Development Center, GS Caltex Corporation, 104-4 Munji-dong, Yuseong-gu, Daejeon, 305-380, Republic of Korea
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Song P, Chen C, Tian Q, Lin M, Huang H, Li S. Two-stage oxygen supply strategy for enhanced lipase production by Bacillus subtilis based on metabolic flux analysis. Biochem Eng J 2013. [DOI: 10.1016/j.bej.2012.11.011] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Huang Y, Li Z, Shimizu K, Ye Q. Co-production of 3-hydroxypropionic acid and 1,3-propanediol by Klebseilla pneumoniae expressing aldH under microaerobic conditions. BIORESOURCE TECHNOLOGY 2013. [PMID: 23201906 DOI: 10.1016/j.biortech.2012.10.143] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Fed-batch cultures of Klebsiella pneumoniae expressing Escherichia coli aldH were performed under microaerobic conditions to investigate the effects on metabolites production. Increasing the aeration rate enhanced cell growth and 3-hydroxypropionic acid (3-HP) production, but reduced 1,3-propanediol (1,3-PDO) formation. The recombinant strain K. pneumoniae/pUC18kan-aldHec produced 48.9 g/L of 3-HP and 25.3g/L of 1,3-PDO with an overall yield of 0.66 mol/mol in 28 h at an aeration rate of 1.5 vvm; however, under fully aerobic condition, no 3-HP and 1,3-PDO were produced due to the repression of dha operon. The flux through the reaction catalyzed by glycerol dehydratase and the split ratio of 1,3-PDO were negatively correlated with the aeration rate, even though the 3-HP level showed a positive trend. This study demonstrated that the relative amounts of 3-HP and 1,3-PDO can be controlled by the aeration rate.
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Affiliation(s)
- Yanna Huang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China
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He L, Zhao X, Cheng K, Sun Y, Liu D. Kinetic Modeling of Fermentative Production of 1, 3-Propanediol by Klebsiella pneumoniae HR526 with Consideration of Multiple Product Inhibitions. Appl Biochem Biotechnol 2012. [DOI: 10.1007/s12010-012-9984-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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15
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Liu Z, Wang X, Qi Q, Hua Q. Quantification and analysis of metabolic characteristics of aerobic succinate-producing Escherichia coli under different aeration conditions. Process Biochem 2012. [DOI: 10.1016/j.procbio.2012.01.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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16
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Metabolic Flux and Nodes Control Analysis of Brewer’s Yeasts Under Different Fermentation Temperature During Beer Brewing. Appl Biochem Biotechnol 2012; 168:1938-52. [PMID: 23065402 DOI: 10.1007/s12010-012-9909-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2012] [Accepted: 10/03/2012] [Indexed: 11/25/2022]
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Chatzifragkou A, Aggelis G, Komaitis M, Zeng AP, Papanikolaou S. Impact of anaerobiosis strategy and bioreactor geometry on the biochemical response of Clostridium butyricum VPI 1718 during 1,3-propanediol fermentation. BIORESOURCE TECHNOLOGY 2011; 102:10625-10632. [PMID: 21967709 DOI: 10.1016/j.biortech.2011.09.023] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2011] [Revised: 09/05/2011] [Accepted: 09/07/2011] [Indexed: 05/31/2023]
Abstract
The impact of anaerobiosis strategy on 1,3-propanediol production during cultivation of Clostridium butyricum VPI 1718 in different size bioreactors was studied. In batch trials with N2 gas infusion, the fermentation was successfully accomplished, regardless of initial glycerol concentration imposed and bioreactor geometry. However, in the absence of N2 continual sparging, significant variations concerning the biochemical response of the strain were observed. Specifically, at 1-L bioreactor, the absence of N2 infusion at high initial glycerol concentration induced lactate dehydrogenase activity and thus lactic acid synthesis, probably due to partial blockage of phosphoroclastic reaction caused by insufficient self-generated anaerobiosis environment. During fed-batch cultivation with continual N2 sparging, the strain produced ∼71 g L(-1) of 1,3-propanediol, whereas under self-generated anaerobiosis, 1,3-propanediol pathway was evidently restricted, as only 30.5 g L(-1) of 1,3-propanediol were finally produced. Apparently, N2 infusion strategy paired with bioreactor geometry can alter the biochemical behavior of the particular strain.
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Affiliation(s)
- Afroditi Chatzifragkou
- Department of Food Science and Technology, Agricultural University of Athens, 75 Iera Odos, 11855 Athens, Greece
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Metabolic pathway analysis of 1,3-propanediol production with a genetically modified Klebsiella pneumoniae by overexpressing an endogenous NADPH-dependent alcohol dehydrogenase. Biochem Eng J 2011. [DOI: 10.1016/j.bej.2011.02.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Liu H, Xu Y, Zheng Z, Liu D. 1,3-Propanediol and its copolymers: research, development and industrialization. Biotechnol J 2011; 5:1137-48. [PMID: 21058316 DOI: 10.1002/biot.201000140] [Citation(s) in RCA: 106] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
1,3-Propanediol (PDO), is now taking the transition from a traditional "specialty chemical" to a "commodity chemical". The market for PDO is growing rapidly as the technology develops. With the advancing PDO production technology, polytrimethylene terephthalate (PTT) as a new type of polyester has been applied in carpet and textile fibers, monofilaments, films, and nonwoven fabrics, and in the engineering thermoplastics area, because PTT has unique properties compared to other polymers such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT). Responding to the environmental and sustainability factors, one- or two-step fermentation technology for PDO production has attracted people's attention. A novel flexible process for PDO production by using aerobic fermentation from glycerol or glucose has been developed and demonstrated with a facility capacity of 4000 t/year in a pilot plant. By using engineered Escherichia coli, 135 g/L PDO was obtained with glucose as feedstock. Since the bio-process of PDO production consumes 40% less energy and reduces greenhouse gas emissions by 20% versus petroleum-based propanediol, the bio-based PTT is more environmentally friendly and sustainable compared with the fossil fuel-based polymers, which made PTT more attractive with good prospects for the future.
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Affiliation(s)
- Hongjuan Liu
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, China
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Elementary mode analysis for the rational design of efficient succinate conversion from glycerol by Escherichia coli. J Biomed Biotechnol 2010; 2010:518743. [PMID: 20886007 PMCID: PMC2945650 DOI: 10.1155/2010/518743] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2009] [Revised: 05/20/2010] [Accepted: 07/07/2010] [Indexed: 11/17/2022] Open
Abstract
By integrating the restriction of oxygen and redox sensing/regulatory system, elementary mode analysis was used to predict the metabolic potential of glycerol for succinate production by E. coli under either anaerobic or aerobic conditions. It was found that although the theoretical maximum succinate yields under both anaerobic and aerobic conditions are 1.0 mol/mol glycerol, the aerobic condition was considered to be more favorable for succinate production. Although increase of the oxygen concentration would reduce the succinate yield, the calculation suggests that controlling the molar fraction of oxygen to be under 0.65 mol/mol would be beneficial for increasing the succinate productivity. Based on the elementary mode analysis, the rational genetic modification strategies for efficient succinate production under aerobic and anaerobic conditions were obtained, respectively. Overexpressing the phosphoenolpyruvate carboxylase or heterogeneous pyruvate carboxylase is considered to be the most efficient strategy to increase the succinate yield.
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Wang Y, Teng H, Xiu Z. Effect of aeration strategy on the metabolic flux of Klebsiella pneumoniae producing 1,3-propanediol in continuous cultures at different glycerol concentrations. J Ind Microbiol Biotechnol 2010; 38:705-15. [DOI: 10.1007/s10295-010-0851-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2010] [Accepted: 08/16/2010] [Indexed: 11/29/2022]
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