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Hertle E, Ursinus A, Martin J. Low-temperature features of the psychrophilic chaperonin from Pseudoalteromonas haloplanktis. Arch Microbiol 2024; 206:299. [PMID: 38861015 PMCID: PMC11166852 DOI: 10.1007/s00203-024-04019-y] [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: 03/28/2024] [Accepted: 05/25/2024] [Indexed: 06/12/2024]
Abstract
Chaperonins from psychrophilic bacteria have been shown to exist as single-ring complexes. This deviation from the standard double-ring structure has been thought to be a beneficial adaptation to the cold environment. Here we show that Cpn60 from the psychrophile Pseudoalteromonas haloplanktis (Ph) maintains its double-ring structure also in the cold. A strongly reduced ATPase activity keeps the chaperonin in an energy-saving dormant state, until binding of client protein activates it. Ph Cpn60 in complex with co-chaperonin Ph Cpn10 efficiently assists in protein folding up to 55 °C. Moreover, we show that recombinant expression of Ph Cpn60 can provide its host Escherichia coli with improved viability under low temperature growth conditions. These properties of the Ph chaperonin may make it a valuable tool in the folding and stabilization of psychrophilic proteins.
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Affiliation(s)
- Eva Hertle
- Department of Protein Evolution, Max Planck Institute for Biology, Max-Planck-Ring 5, 72076, Tübingen, Germany
| | - Astrid Ursinus
- Department of Protein Evolution, Max Planck Institute for Biology, Max-Planck-Ring 5, 72076, Tübingen, Germany
| | - Jörg Martin
- Department of Protein Evolution, Max Planck Institute for Biology, Max-Planck-Ring 5, 72076, Tübingen, Germany.
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2
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Gao S, Liao Y, He H, Yang H, Yang X, Xu S, Wang X, Chen K, Ouyang P. Advance of tolerance engineering on microbes for industrial production. Synth Syst Biotechnol 2023; 8:697-707. [PMID: 38025766 PMCID: PMC10656194 DOI: 10.1016/j.synbio.2023.10.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2023] [Revised: 10/19/2023] [Accepted: 10/23/2023] [Indexed: 12/01/2023] Open
Abstract
Industrial microbes have become the core of biological manufacturing, which utilized as the cell factory for production of plenty of chemicals, fuels and medicine. However, the challenge that the extreme stress conditions exist in production is unavoidable for cell factory. Consequently, to enhance robustness of the chassis cell lays the foundation for development of bio-manufacturing. Currently, the researches on cell tolerance covered various aspects, involving reshaping regulatory network, cell membrane modification and other stress response. In fact, the strategies employed to improve cell robustness could be summarized into two directions, irrational engineering and rational engineering. In this review, the metabolic engineering technologies on enhancement of microbe tolerance to industrial conditions are summarized. Meanwhile, the novel thoughts emerged with the development of biological instruments and synthetic biology are discussed.
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Affiliation(s)
- Siyuan Gao
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211816, Jiangsu, China
| | - Yang Liao
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211816, Jiangsu, China
| | - Hao He
- Petrochemical Research Institute of PetroChina Co. Ltd., Beijing, 102206, China
| | - Huiling Yang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211816, Jiangsu, China
| | - Xuewei Yang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211816, Jiangsu, China
| | - Sheng Xu
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211816, Jiangsu, China
| | - Xin Wang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211816, Jiangsu, China
| | - Kequan Chen
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211816, Jiangsu, China
| | - Pingkai Ouyang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211816, Jiangsu, China
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3
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Liang P, Li J, Wang Q, Dai Z. Enhancing the thermotolerance and erythritol production of Yarrowia lipolytica by introducing heat-resistant devices. Front Bioeng Biotechnol 2023; 11:1108653. [PMID: 36845173 PMCID: PMC9947466 DOI: 10.3389/fbioe.2023.1108653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2022] [Accepted: 01/20/2023] [Indexed: 02/11/2023] Open
Abstract
Yarrowia lipolytica has been widely used in the food biotech-related industry, where it plays the host's role in producing erythritol. Nevertheless, a temperature of about 28°C-30°C has been estimated as the yeast's optimal growth temperature, leading to the consumption of a considerable quantity of cooling water, especially in summer, which is obligatory for fermentation. Herein is described a method for improving the thermotolerance and erythritol production efficiency at high temperatures of Y. lipolytica. Through screening and testing different heat resistant devices, eight refactored engineered strains showed better growth at higher temperature and the antioxidant properties of the eight engineered strains were also improved. In addition, the erythritol titer, yield and productivity of the strain FOS11-Ctt1 represented the best among the eight strains, reaching at 39.25 g/L, 0.348 g/g glucose, and 0.55 g/L/h respectively, which were increased by 156%, 86% and 161% compared with the control strain, respectively. This study provides insight into an effective heat-resistant device that could enhance the thermotolerance and erythritol production of Y. lipolytica, which might be considered a valued scientific reference for other resistant strains' construction.
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Affiliation(s)
- Peixin Liang
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, China,National Center of Technology Innovation for Synthetic Biology, Tianjin, China
| | - Jing Li
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, China,National Center of Technology Innovation for Synthetic Biology, Tianjin, China,College of Biotechnology, Tianjin University of Science and Technology, Tianjin, China
| | - Qinhong Wang
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, China,National Center of Technology Innovation for Synthetic Biology, Tianjin, China
| | - Zongjie Dai
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, China,National Center of Technology Innovation for Synthetic Biology, Tianjin, China,*Correspondence: Zongjie Dai,
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4
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Efficient biosynthesis of polysaccharide welan gum in heat shock protein-overproducing Sphingomonas sp. via temperature-dependent strategy. Bioprocess Biosyst Eng 2020; 44:247-257. [PMID: 32944865 DOI: 10.1007/s00449-020-02438-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Accepted: 08/26/2020] [Indexed: 10/23/2022]
Abstract
Cell growth and product formation are two critical processes in polysaccharide welan biosynthesis, but the conflict between them is often encountered. In this study, a temperature-dependent strategy was designed for two-stage welan production through overexpressing heat shock proteins in Sphingomonas sp. The first stage was cell growth phase with higher TCA cycle activity at 42 °C; the second stage was welan formation phase with higher precursor synthesis pathway activity at 37 °C. The highest welan concentration 37.5 g/L was achieved after two-stage process. Ultimately, this strategy accumulated welan yield of 79.2 g/100 g glucose and productivity of 0.62 g/L/h at 60 h, which were the best reported results so far. The duration of fermentation was shortened. Besides, rheological behavior of welan gum solutions remained stable at wide range of temperature, pH, and NaCl. These results indicated that this approach efficiently improved welan synthesis.
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5
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Gao L, Wu X, Zhu C, Jin Z, Wang W, Xia X. Metabolic engineering to improve the biomanufacturing efficiency of acetic acid bacteria: advances and prospects. Crit Rev Biotechnol 2020; 40:522-538. [DOI: 10.1080/07388551.2020.1743231] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Ling Gao
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, PR China
- State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology Shandong Academy of Sciences, Jinan, PR China
| | - Xiaodan Wu
- The Key Laboratory of Industrial Biotechnology, Ministry of Education School of Biotechnology, Jiangnan University, Wuxi, PR China
| | - Cailin Zhu
- The Key Laboratory of Industrial Biotechnology, Ministry of Education School of Biotechnology, Jiangnan University, Wuxi, PR China
| | - Zhengyu Jin
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, PR China
| | - Wu Wang
- The Key Laboratory of Industrial Biotechnology, Ministry of Education School of Biotechnology, Jiangnan University, Wuxi, PR China
| | - Xiaole Xia
- The Key Laboratory of Industrial Biotechnology, Ministry of Education School of Biotechnology, Jiangnan University, Wuxi, PR China
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Xu G, Wu A, Xiao L, Han R, Ni Y. Enhancing butanol tolerance of Escherichia coli reveals hydrophobic interaction of multi-tasking chaperone SecB. BIOTECHNOLOGY FOR BIOFUELS 2019; 12:164. [PMID: 31297152 PMCID: PMC6598250 DOI: 10.1186/s13068-019-1507-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Accepted: 06/19/2019] [Indexed: 06/09/2023]
Abstract
BACKGROUND Escherichia coli has been proved to be one promising platform chassis for the production of various natural products, such as biofuels. Product toxicity is one of the main bottlenecks for achieving maximum production of biofuels. Host strain engineering is an effective approach to alleviate solvent toxicity issue in fermentation. RESULTS Thirty chaperones were overexpressed in E. coli JM109, and SecB recombinant strain was identified with the highest n-butanol tolerance. The tolerance (T) of E. coli overexpressing SecB, calculated by growth difference in the presence and absence of solvents, was determined to be 9.13% at 1.2% (v/v) butanol, which was 3.2-fold of the control strain. Random mutagenesis of SecB was implemented and homologously overexpressed in E. coli, and mutant SecBT10A was identified from 2800 variants rendering E. coli the highest butanol tolerance. Saturation mutagenesis on T10 site revealed that hydrophobic residues were required for high butanol tolerance of E. coli. Compared with wild-type (WT) SecB, the T of SecBT10A strain was further increased from 9.14 to 14.4% at 1.2% butanol, which was 5.3-fold of control strain. Remarkably, E. coli engineered with SecBT10A could tolerate as high as 1.8% butanol (~ 14.58 g/L). The binding affinity of SecBT10A toward model substrate unfolded maltose binding protein (preMBP) was 11.9-fold of that of WT SecB as determined by isothermal titration calorimetry. Residue T10 locates at the entrance of hydrophobic substrate binding groove of SecB, and might play an important role in recognition and binding of cargo proteins. CONCLUSIONS SecB chaperone was identified by chaperone mining to be effective in enhancing butanol tolerance of E. coli. Maximum butanol tolerance of E. coli could reach 1.6% and 1.8% butanol by engineering single gene of SecB or SecBT10A. Hydrophobic interaction is vital for enhanced binding affinity between SecB and cargo proteins, and therefore improved butanol tolerance.
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Affiliation(s)
- Guochao Xu
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122 Jiangsu China
| | - Anning Wu
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122 Jiangsu China
| | - Lin Xiao
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122 Jiangsu China
| | - Ruizhi Han
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122 Jiangsu China
| | - Ye Ni
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122 Jiangsu China
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Improvement of stress tolerance and riboflavin production of Bacillus subtilis by introduction of heat shock proteins from thermophilic bacillus strains. Appl Microbiol Biotechnol 2019; 103:4455-4465. [PMID: 30968162 DOI: 10.1007/s00253-019-09788-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Revised: 03/12/2019] [Accepted: 03/19/2019] [Indexed: 10/27/2022]
Abstract
In this study, stress tolerance devices consisting of heat shock protein (HSP) genes from thermophiles Geobacillus and Parageobacillus were introduced into riboflavin-producing strain Bacillus subtilis 446 to improve its stress tolerance and riboflavin production. The 12 HSP homologs were selected from 28 Geobacillus and Parageobacillus genomes according to their sequence clustering and phylogenetically analysis which represents the diversity of HSPs from thermophilic bacillus. The 12 HSP genes and 2 combinations of them (PtdnaK-PtdnaJ-PtgrpE and PtgroeL-PtgroeS) were heterologously expressed in B. subtilis 446 under the control of a strong constitutive promoter P43. Most of the 14 engineered strains showed increased cell density at 44 to 48 °C and less cell death at 50 °C compared with the control strains. Among them, strains B.s446-HSP20-3, B.s446-HSP20-2, and B.s446-PtDnaK-PtDnaJ-PtGrpE increased their cell densities over 25% at 44 to 48 °C. They also showed 5-, 4-, and 4-fold improved cell survivals after the 10-h heat shock treatment at 50 °C, respectively. These three strains also showed reduced cell death rates under osmotic stress of 10% NaCl, indicating that the introduction of HSPs improved not only the heat tolerance of B. subtilis 446 but also its osmotic tolerance. Fermentation of these three strains at higher temperatures of 39 and 43 °C showed 23-66% improved riboflavin titers, as well as 24-h shortened fermentation period. These results indicated that implanting HSPs from thermophiles to B. subtilis 446 would be an efficient approach to improve its stress tolerance and riboflavin production.
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Dong Z, Chen X, Cai K, Shen P, Tian K, Jin P, Liu X, Wang Z. Overexpression of the Bacillus licheniformis GroES enhances thermotolerance of Bacillus subtilis WB600. BIOTECHNOL BIOTEC EQ 2018. [DOI: 10.1080/13102818.2018.1517029] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Affiliation(s)
- Zixing Dong
- Department of Biochemical Engineering, College of Chemical Engineering and Materials Science, Tianjin University of Science & Technology, Tianjin, PR China
| | - Xiaoling Chen
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, College of Biotechnology, Tianjin University of Science & Technology, Tianjin, PR China
| | - Ke Cai
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, College of Biotechnology, Tianjin University of Science & Technology, Tianjin, PR China
| | - Peili Shen
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, College of Biotechnology, Tianjin University of Science & Technology, Tianjin, PR China
| | - Kangming Tian
- Department of Biochemical Engineering, College of Chemical Engineering and Materials Science, Tianjin University of Science & Technology, Tianjin, PR China
| | - Peng Jin
- Department of Biochemical Engineering, College of Chemical Engineering and Materials Science, Tianjin University of Science & Technology, Tianjin, PR China
| | - Xiaoguang Liu
- Department of Biochemical Engineering, College of Chemical Engineering and Materials Science, Tianjin University of Science & Technology, Tianjin, PR China
| | - Zhengxiang Wang
- Department of Biochemical Engineering, College of Chemical Engineering and Materials Science, Tianjin University of Science & Technology, Tianjin, PR China
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, College of Biotechnology, Tianjin University of Science & Technology, Tianjin, PR China
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9
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Tailoring cyanobacterial cell factory for improved industrial properties. Biotechnol Adv 2018; 36:430-442. [DOI: 10.1016/j.biotechadv.2018.01.005] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Revised: 01/07/2018] [Accepted: 01/08/2018] [Indexed: 11/20/2022]
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10
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Wang S, Dong S, Wang Y. Enhancement of solvent production by overexpressing key genes of the acetone-butanol-ethanol fermentation pathway in Clostridium saccharoperbutylacetonicum N1-4. BIORESOURCE TECHNOLOGY 2017; 245:426-433. [PMID: 28898840 DOI: 10.1016/j.biortech.2017.09.024] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Revised: 09/03/2017] [Accepted: 09/04/2017] [Indexed: 05/24/2023]
Abstract
Clostridium saccharoperbutylacetonicum N1-4 is well known as a hyper-butanol producing strain. However, little information is available concerning its butanol production mechanism and the development of more robust strains. In this study, key biosynthetic genes (either endogenous or exogenous) including the sol operon (bld-ctfA-ctfB-adc), adhE1, adhE1D485G, thl, thlA1V5A, thlAV5A and the expression cassette EC (thl-hbd-crt-bcd) were overexpressed in C. saccharoperbutylacetonicum N1-4 to evaluate their potential in enhancement of butanol production. The overexpression of sol operon increased ethanol production by 400%. The overexpression of adhE1 and adhED485G resulted in a 5.6- and 4.9-fold higher ethanol production, respectively, producing final acetone-butanol-ethanol (ABE) titers (30.6 and 30.1gL-1) of among the highest as ever reported for solventogenic clostridia. The most significant increase of butanol production (by 13.7%) and selectivity (73.7%) was achieved by the overexpression of EC. These results provides a solid foundation and essential references for the further development of more robust strains.
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Affiliation(s)
- Shaohua Wang
- Department of Biosystems Engineering, Auburn University, Auburn, AL 36849, USA
| | - Sheng Dong
- Department of Biosystems Engineering, Auburn University, Auburn, AL 36849, USA
| | - Yi Wang
- Department of Biosystems Engineering, Auburn University, Auburn, AL 36849, USA; Center for Bioenergy and Bioproducts, Auburn University, Auburn, AL 36849, USA.
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11
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Improving cellular robustness and butanol titers of Clostridium acetobutylicum ATCC824 by introducing heat shock proteins from an extremophilic bacterium. J Biotechnol 2017; 252:1-10. [DOI: 10.1016/j.jbiotec.2017.04.031] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Revised: 04/07/2017] [Accepted: 04/24/2017] [Indexed: 11/30/2022]
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Sun H, Jia H, Li J, Feng X, Liu Y, Zhou X, Li C. Rational synthetic combination genetic devices boosting high temperature ethanol fermentation. Synth Syst Biotechnol 2017; 2:121-129. [PMID: 29062969 PMCID: PMC5636948 DOI: 10.1016/j.synbio.2017.04.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Revised: 03/21/2017] [Accepted: 04/25/2017] [Indexed: 11/27/2022] Open
Abstract
The growth and production of yeast in the industrial fermentation are seriously restrained by heat stress and exacerbated by heat induced oxidative stress. In this study, a novel synthetic biology approach was developed to globally boost the viability and production ability of S. cerevisiae at high temperature through rationally designing and combing heat shock protein (HSP) and superoxide dismutase (SOD) genetic devices to ultimately synergistically alleviate both heat stress and oxidative stress. HSP and SOD from extremophiles were constructed to be different genetic devices and they were preliminary screened by heat resistant experiments and anti-oxidative experiments, respectively. Then in order to customize and further improve thermotolerance of S. cerevisiae, the HSP genetic device and SOD genetic device were rationally combined. The results show the simply assemble of the same function genetic devices to solve heat stress or oxidative stress could not enhance the thermotolerance considerably. Only S. cerevisiae with the combination genetic device (FBA1p-sod-MB4-FBA1p-shsp-HB8) solving both stress showed 250% better thermotolerance than the control and displayed further 55% enhanced cell density compared with the strains with single FBA1p-sod-MB4 or FBA1p-shsp-HB8 at 42 °C. Then the most excellent combination genetic device was introduced into lab S. cerevisiae and industrial S. cerevisiae for ethanol fermentation. The ethanol yields of the two strains were increased by 20.6% and 26.3% compared with the control under high temperature, respectively. These results indicate synergistically defensing both heat stress and oxidative stress is absolutely necessary to enhance the thermotolerance and production of S. cerevisiae.
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Affiliation(s)
- Huan Sun
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China
| | - Haiyang Jia
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China
| | - Jun Li
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China
| | - Xudong Feng
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China
| | - Yueqin Liu
- Key Laboratory of Systems Bioengineering, Ministry of Education, Tianjin University, Tianjin, 300072, China
| | - Xiaohong Zhou
- Key Laboratory of Systems Bioengineering, Ministry of Education, Tianjin University, Tianjin, 300072, China
| | - Chun Li
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China.,Key Laboratory of Systems Bioengineering, Ministry of Education, Tianjin University, Tianjin, 300072, China
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Zhu Z, Luan G, Tan X, Zhang H, Lu X. Rescuing ethanol photosynthetic production of cyanobacteria in non-sterilized outdoor cultivations with a bicarbonate-based pH-rising strategy. BIOTECHNOLOGY FOR BIOFUELS 2017; 10:93. [PMID: 28416967 PMCID: PMC5391583 DOI: 10.1186/s13068-017-0765-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 03/18/2017] [Indexed: 06/07/2023]
Abstract
BACKGROUND Ethanol photosynthetic production based on cyanobacteria cell factories utilizing CO2 and solar energy provides an attractive solution for sustainable production of green fuels. However, the scaling up processes of cyanobacteria cell factories were usually threatened or even devastated by biocontaminations, which restricted biomass or products accumulations of cyanobacteria cells. Thus it is of great significance to develop reliable biocontamination-controlling strategies for promoting ethanol photosynthetic production in large scales. RESULTS The scaling up process of a previously developed Synechocystis strain Syn-HZ24 for ethanol synthesis was severely inhibited and devastated by a specific contaminant, Pannonibacter phragmitetus, which overcame the growths of cyanobacteria cells and completely consumed the ethanol accumulation in the cultivation systems. Physiological analysis revealed that growths and ethanol-consuming activities of the contaminant were sensitive to alkaline conditions, while ethanol-synthesizing cyanobacteria strain Syn-HZ24 could tolerate alkaline pH conditions as high as 11.0, indicating that pH-increasing strategy might be a feasible approach for rescuing ethanol photosynthetic production in outdoor cultivation systems. Thus, we designed and evaluated a Bicarbonate-based Integrated Carbon Capture System (BICCS) derived pH-rising strategy to rescue the ethanol photosynthetic production in non-sterilized conditions. In lab scale artificially simulated systems, pH values of BG11 culture medium were maintained around 11.0 by 180 mM NaHCO3 and air steam, under which the infection of Pannonibacter phragmitetus was significantly restricted, recovering ethanol production of Syn-HZ24 by about 80%. As for outdoor cultivations, ethanol photosynthetic production of Syn-HZ24 was also successfully rescued by the BICCS-derived pH-rising strategy, obtaining a final ethanol concentration of 0.9 g/L after 10 days cultivation. CONCLUSIONS In this work, a novel product-consuming biocontamination pattern in cyanobacteria cultivations, causing devastated ethanol photosynthetic production, was identified and characterized. Physiological analysis of the essential ethanol-consuming contaminant directed the design and application of a pH-rising strategy, which effectively and selectively controlled the contamination and rescued ethanol photosynthetic production. Our work demonstrated the importance of reliable contamination control systems and strategies for large scale outdoor cultivations of cyanobacteria, and provided an inspiring paradigm for targeting effective solutions.
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Affiliation(s)
- Zhi Zhu
- Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, No. 189 Songling Road, Qingdao, 266101 China
- Shandong Provincial Key Laboratory of Energy Genetics, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, No. 189 Songling Road, Qingdao, 266101 China
- University of Chinese Academy of Sciences, Beijing, 100049 China
| | - Guodong Luan
- Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, No. 189 Songling Road, Qingdao, 266101 China
- Shandong Provincial Key Laboratory of Synthetic Biology, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, No. 189 Songling Road, Qingdao, 266101 China
| | - Xiaoming Tan
- Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, No. 189 Songling Road, Qingdao, 266101 China
- Shandong Provincial Key Laboratory of Synthetic Biology, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, No. 189 Songling Road, Qingdao, 266101 China
| | - Haocui Zhang
- Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, No. 189 Songling Road, Qingdao, 266101 China
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 China
| | - Xuefeng Lu
- Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, No. 189 Songling Road, Qingdao, 266101 China
- Shandong Provincial Key Laboratory of Synthetic Biology, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, No. 189 Songling Road, Qingdao, 266101 China
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14
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Gao L, Liu Y, Sun H, Li C, Zhao Z, Liu G. Advances in mechanisms and modifications for rendering yeast thermotolerance. J Biosci Bioeng 2016; 121:599-606. [DOI: 10.1016/j.jbiosc.2015.11.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Revised: 11/05/2015] [Accepted: 11/08/2015] [Indexed: 10/22/2022]
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15
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Jia H, Sun X, Sun H, Li C, Wang Y, Feng X, Li C. Intelligent Microbial Heat-Regulating Engine (IMHeRE) for Improved Thermo-Robustness and Efficiency of Bioconversion. ACS Synth Biol 2016; 5:312-20. [PMID: 26793993 DOI: 10.1021/acssynbio.5b00158] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The growth and production of microorganisms in bioconversion are often hampered by heat stress. In this study, an intelligent microbial heat-regulating engine (IMHeRE) was developed and customized to improve the thermo-robustness of Escherichia coli via the integration of a thermotolerant system and a quorum-regulating system. At the cell level, the thermotolerant system composed of different heat shock proteins and RNA thermometers hierarchically expands the optimum temperature by sensing heat changes. At the community level, the quorum-regulating system dynamically programs the altruistic sacrifice of individuals to reduce metabolic heat release by sensing the temperature and cell density. Using this hierarchical, dynamical, and multilevel regulation, the IMHeRE is able to significantly improve cell growth and production. In a real application, the production of lysine was increased 5-fold at 40 °C using the IMHeRE. Our work provides new potential for the development of bioconversion by conserving energy and increasing productivity.
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Affiliation(s)
- Haiyang Jia
- Department
of Biological Engineering, School of Life Science, Beijing Institute of Technology, Beijing 100081, P. R. China
| | - Xiangying Sun
- Department
of Biological Engineering, School of Life Science, Beijing Institute of Technology, Beijing 100081, P. R. China
| | - Huan Sun
- Department
of Biological Engineering, School of Life Science, Beijing Institute of Technology, Beijing 100081, P. R. China
| | - Chenyi Li
- Department
of Biological Engineering, School of Life Science, Beijing Institute of Technology, Beijing 100081, P. R. China
| | - Yunqian Wang
- Department
of Biological Engineering, School of Life Science, Beijing Institute of Technology, Beijing 100081, P. R. China
| | - Xudong Feng
- Department
of Biological Engineering, School of Life Science, Beijing Institute of Technology, Beijing 100081, P. R. China
| | - Chun Li
- Department
of Biological Engineering, School of Life Science, Beijing Institute of Technology, Beijing 100081, P. R. China
- State
Key Laboratory of System Bioengineering of the Ministry of Education, Tianjin University, Tianjin 300072, P. R. China
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Luan G, Bao G, Lin Z, Li Y, Chen Z, Li Y, Cai Z. Comparative genome analysis of a thermotolerant Escherichia coli obtained by Genome Replication Engineering Assisted Continuous Evolution (GREACE) and its parent strain provides new understanding of microbial heat tolerance. N Biotechnol 2015; 32:732-8. [DOI: 10.1016/j.nbt.2015.01.013] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Revised: 01/27/2015] [Accepted: 01/30/2015] [Indexed: 11/15/2022]
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Jia H, Fan Y, Feng X, Li C. Enhancing stress-resistance for efficient microbial biotransformations by synthetic biology. Front Bioeng Biotechnol 2014; 2:44. [PMID: 25368869 PMCID: PMC4202804 DOI: 10.3389/fbioe.2014.00044] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Accepted: 10/04/2014] [Indexed: 12/23/2022] Open
Abstract
Chemical conversions mediated by microorganisms, otherwise known as microbial biotransformations, are playing an increasingly important role within the biotechnology industry. Unfortunately, the growth and production of microorganisms are often hampered by a number of stressful conditions emanating from environment fluctuations and/or metabolic imbalances such as high temperature, high salt condition, strongly acidic solution, and presence of toxic metabolites. Therefore, exploring methods to improve the stress tolerance of host organisms could significantly improve the biotransformation process. With the help of synthetic biology, it is now becoming feasible to implement strategies to improve the stress-resistance of the existing hosts. This review summarizes synthetic biology efforts to enhance the efficiency of biotransformations by improving the robustness of microbes. Particular attention will be given to strategies at the cellular and the microbial community levels.
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Affiliation(s)
- Haiyang Jia
- Department of Biological Engineering, School of Life Science, Beijing Institute of Technology , Beijing , China
| | - Yanshuang Fan
- Department of Biological Engineering, School of Life Science, Beijing Institute of Technology , Beijing , China
| | - Xudong Feng
- Department of Biological Engineering, School of Life Science, Beijing Institute of Technology , Beijing , China
| | - Chun Li
- Department of Biological Engineering, School of Life Science, Beijing Institute of Technology , Beijing , China
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Liu Y, Zhang G, Sun H, Sun X, Jiang N, Rasool A, Lin Z, Li C. Enhanced pathway efficiency of Saccharomyces cerevisiae by introducing thermo-tolerant devices. BIORESOURCE TECHNOLOGY 2014; 170:38-44. [PMID: 25118151 DOI: 10.1016/j.biortech.2014.07.063] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2014] [Revised: 07/15/2014] [Accepted: 07/16/2014] [Indexed: 06/03/2023]
Abstract
In this study, thermo-tolerant devices consisting of heat shock genes from thermophiles were designed and introduced into Saccharomyces cerevisiae for improving its thermo-tolerance. Among ten engineered thermo-tolerant yeasts, T.te-TTE2469, T.te-GroS2 and T.te-IbpA displayed over 25% increased cell density and 1.5-4-fold cell viability compared with the control. Physiological characteristics of thermo-tolerant strains revealed that better cell wall integrity, higher trehalose content and enhanced metabolic energy were preserved by thermo-tolerant devices. Engineered thermo-tolerant strain was used to investigate the impact of thermo-tolerant device on pathway efficiency by introducing β-amyrin synthesis pathway, showed 28.1% increased β-amyrin titer, 28-35°C broadened growth temperature range and 72h shortened fermentation period. The results indicated that implanting heat shock proteins from thermophiles to S. cerevisiae would be an efficient approach to improve its thermo-tolerance.
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Affiliation(s)
- Yueqin Liu
- School of Chemical Engineering, Tianjin University, Tianjin 300072, China
| | - Genli Zhang
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China
| | - Huan Sun
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China
| | - Xiangying Sun
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China
| | - Nisi Jiang
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China
| | - Aamir Rasool
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China
| | | | - Chun Li
- School of Chemical Engineering, Tianjin University, Tianjin 300072, China; School of Life Science, Beijing Institute of Technology, Beijing 100081, China.
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Tripathi L, Zhang Y, Lin Z. Bacterial sigma factors as targets for engineered or synthetic transcriptional control. Front Bioeng Biotechnol 2014; 2:33. [PMID: 25232540 PMCID: PMC4153023 DOI: 10.3389/fbioe.2014.00033] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2014] [Accepted: 08/20/2014] [Indexed: 11/20/2022] Open
Abstract
Sigma (σ) factors are the predominant constituents of transcription regulation in bacteria. σ Factors recruit the core RNA polymerase to recognize promoters with specific DNA sequences. Recently, engineering of transcriptional regulators has become a significant tool for strain engineering. The present review summarizes the recent advances in σ factor based engineering or synthetic design. The manipulation of σ factors presents insights into the bacterial stress tolerance and metabolite productivity. We envision more synthetic design based on σ factors that can be used to tune the regulatory network of bacteria.
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Affiliation(s)
- Lakshmi Tripathi
- Department of Chemical Engineering, Tsinghua University , Beijing , China
| | - Yan Zhang
- Department of Chemical Engineering, Tsinghua University , Beijing , China
| | - Zhanglin Lin
- Department of Chemical Engineering, Tsinghua University , Beijing , China
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