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Xu T, Mitra R, Tan D, Li Z, Zhou C, Chen T, Xie Z, Han J. Utilization of gene manipulation system for advancing the biotechnological potential of halophiles: A review. Biotechnol Adv 2024; 70:108302. [PMID: 38101552 DOI: 10.1016/j.biotechadv.2023.108302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Revised: 12/02/2023] [Accepted: 12/09/2023] [Indexed: 12/17/2023]
Abstract
Halophiles are salt-loving microorganisms known to have their natural resistance against media contamination even when cultivated in nonsterile and continuous bioprocess system, thus acting as promising cell factories for Next Generation of Industrial Biotechnology (NGIB). NGIB - a successor to the traditional industrial biotechnology, is a more sustainable and efficient bioprocess technology while saving energy and water in a more convenient way as well as reducing the investment cost and skilled workforce requirement. Numerous studies have achieved intriguing outcomes during synthesis of different metabolite using halophiles such as polyhydroxyalkanoates (PHA), ectoine, biosurfactants, and carotenoids. Present-day development in genetic maneuverings have shown optimistic effects on the industrial applications of halophiles. However, viable and competent genetic manipulation system and gene editing tools are critical to accelerate the process of halophile engineering. With the aid of such powerful gene manipulation systems, exclusive microbial chassis are being crafted with desirable features to breed another innovative area of research such as synthetic biology. This review provides an aerial perspective on how the expansion of adaptable gene manipulation toolkits in halophiles are contributing towards biotechnological advancement, and also focusses on their subsequent application for production improvement. This current methodical and comprehensive review will definitely help the scientific fraternity to bridge the gap between challenges and opportunities in halophile engineering.
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Affiliation(s)
- Tong Xu
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, People's Republic of China
| | - Ruchira Mitra
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, People's Republic of China; International College, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Dan Tan
- Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
| | - Zhengjun Li
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
| | - Cheng Zhou
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, People's Republic of China; College of Biochemical Engineering, Beijing Union University, Beijing 100023, People's Republic of China
| | - Tao Chen
- Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (MOE), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People's Republic of China
| | - Zhengwei Xie
- Peking University International Cancer Institute, Health Science Center, Peking University, Beijing 100191, People's Republic of China
| | - Jing Han
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, People's Republic of China; College of Life Science, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
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Huang T, Ma Y. Advances in biosynthesis of higher alcohols in Escherichia coli. World J Microbiol Biotechnol 2023; 39:125. [PMID: 36941474 DOI: 10.1007/s11274-023-03580-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Accepted: 03/13/2023] [Indexed: 03/23/2023]
Abstract
In recent years, the development of green energy to replace fossil fuels has been the focus of research. Higher alcohols are important biofuels and chemicals. The production of higher alcohols in microbes has gained attention due to its environmentally friendly character. Higher alcohols have been synthesized in model microorganism Escherichia coli, and the production has reached the gram level through enhancement of metabolic flow, the balance of reducing power and the optimization of fermentation processes. Sustainable bio-higher alcohols production is expected to replace fossil fuels as a green and renewable energy source. Therefore, this review summarizes the latest developments in producing higher alcohols (C3-C6) by E. coli, elucidate the main bottlenecks limiting the biosynthesis of higher alcohols, and proposes potential engineering strategies of improving the production of biological higher alcohols. This review would provide a theoretical basis for further research on higher alcohols production by E. coli.
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Affiliation(s)
- Tong Huang
- Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People's Republic of China
| | - Yuanyuan Ma
- Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People's Republic of China.
- School of Marin Science and Technology, Tianjin University, Tianjin, 300072, China.
- R&D Center for Petrochemical Technology, Tianjin University, Tianjin, 300072, China.
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3
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Ye JW, Lin YN, Yi XQ, Yu ZX, Liu X, Chen GQ. Synthetic biology of extremophiles: a new wave of biomanufacturing. Trends Biotechnol 2023; 41:342-357. [PMID: 36535816 DOI: 10.1016/j.tibtech.2022.11.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Revised: 11/12/2022] [Accepted: 11/25/2022] [Indexed: 12/23/2022]
Abstract
Microbial biomanufacturing, powered by the advances of synthetic biology, has attracted growing interest for the production of diverse products. In contrast to conventional microbes, extremophiles have shown better performance for low-cost production owing to their outstanding growth and synthesis capacity under stress conditions, allowing unsterilized fermentation processes. We review increasing numbers of products already manufactured utilizing extremophiles in recent years. In addition, genetic parts, molecular tools, and manipulation approaches for extremophile engineering are also summarized, and challenges and opportunities are predicted for non-conventional chassis. Next-generation industrial biotechnology (NGIB) based on engineered extremophiles promises to simplify biomanufacturing processes and achieve open and continuous fermentation, without sterilization, and utilizing low-cost substrates, making NGIB an attractive green process for sustainable manufacturing.
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Affiliation(s)
- Jian-Wen Ye
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China; Guangdong Key Laboratory of Fermentation and Enzyme Engineering, School of Biology and Biological Engineering, South China University of Technology, Guangzhou, China; Guangdong Research Center of Industrial Enzyme and Green Manufacturing Technology, School of Biology and Biological Engineering, South China University of Technology, Guangzhou, China
| | - Yi-Na Lin
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China; Guangdong Key Laboratory of Fermentation and Enzyme Engineering, School of Biology and Biological Engineering, South China University of Technology, Guangzhou, China; Guangdong Research Center of Industrial Enzyme and Green Manufacturing Technology, School of Biology and Biological Engineering, South China University of Technology, Guangzhou, China
| | - Xue-Qing Yi
- School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Zhuo-Xuan Yu
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China
| | - Xu Liu
- PhaBuilder Biotech Company, Shunyi District, Zhaoquan Ying, Beijing 101309, China
| | - Guo-Qiang Chen
- School of Life Sciences, Tsinghua University, Beijing 100084, China; Center for Synthetic and Systems Biology, Tsinghua University, Beijing 100084, China; Ministry of Education (MOE) Laboratory of Industrial Biocatalysis, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China; Tsinghua-Peking Center for Life Sciences, Beijing, China.
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Su Q, Cheng P, Sun J, Zhang Y, Zheng Y, Jiang XR, Rao X. Engineering a mevalonate pathway in Halomonas bluephagenesis for the production of lycopene. Front Microbiol 2023; 13:1100745. [PMID: 36726563 PMCID: PMC9885113 DOI: 10.3389/fmicb.2022.1100745] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Accepted: 12/31/2022] [Indexed: 01/18/2023] Open
Abstract
Introduction Red-colored lycopene has received remarkable attention in medicine because of its antioxidant properties for reducing the risks of many human cancers. However, the extraction of lycopene from natural hosts is limited. Moreover, the chemically synthesized lycopene raises safety concerns due to residual chemical reagents. Halomonas bluephagenesis is a versatile chassis for the production of fine chemicals because of its open growth property without sterilization. Methods A heterologous mevalonate (MVA) pathway was introduced into H. bluephagenesis strain TD1.0 to engineer a bacterial host for lycopene production. A pTer7 plasmid mediating the expression of six MVA pathway genes under the control of a phage PMmp1 and an Escherichia coli Ptrc promoters and a pTer3 plasmid providing lycopene biosynthesis downstream genes derived from Streptomyces avermitilis were constructed and transformed into TD1.0. The production of lycopene in the engineered H. bluephagenesis was evaluated. Optimization of engineered bacteria was performed to increase lycopene yield. Results The engineered TD1.0/pTer7-pTer3 produced lycopene at a maximum yield of 0.20 mg/g dried cell weight (DCW). Replacing downstream genes with those from S. lividans elevated the lycopene production to 0.70 mg/g DCW in the TD1.0/pTer7-pTer5 strain. Optimizing the PMmp1 promoter in plasmid pTer7 with a relatively weak Ptrc even increased the lycopene production to 1.22 mg/g DCW. However, the change in the Ptrc promoter in pTer7 with PMmp1 did not improve the yield of lycopene. Conclusion We first engineered an H. bluephagenesis for the lycopene production. The co-optimization of downstream genes and promoters governing MVA pathway gene expressions can synergistically enhance the microbial overproduction of lycopene.
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Affiliation(s)
- Qixuan Su
- Cancer Center, Medical Research Institute, Southwest University, Chongqing, China
| | - Ping Cheng
- Department of Microbiology, College of Basic Medical Sciences, Army Medical University (Third Military Medical University), Chongqing, China
| | - Jiyuan Sun
- Department of Microbiology, College of Basic Medical Sciences, Army Medical University (Third Military Medical University), Chongqing, China
| | - Yulin Zhang
- Cancer Center, Medical Research Institute, Southwest University, Chongqing, China
| | - Yang Zheng
- Department of Microbiology, College of Basic Medical Sciences, Army Medical University (Third Military Medical University), Chongqing, China
| | - Xiao-Ran Jiang
- Department of Microbiology, College of Basic Medical Sciences, Army Medical University (Third Military Medical University), Chongqing, China,*Correspondence: Xiao-Ran Jiang,
| | - Xiancai Rao
- Cancer Center, Medical Research Institute, Southwest University, Chongqing, China,Department of Microbiology, College of Basic Medical Sciences, Army Medical University (Third Military Medical University), Chongqing, China,Xiancai Rao,
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Obruča S, Dvořák P, Sedláček P, Koller M, Sedlář K, Pernicová I, Šafránek D. Polyhydroxyalkanoates synthesis by halophiles and thermophiles: towards sustainable production of microbial bioplastics. Biotechnol Adv 2022; 58:107906. [DOI: 10.1016/j.biotechadv.2022.107906] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 12/15/2021] [Accepted: 01/07/2022] [Indexed: 01/10/2023]
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Engineering for an HPV 9-valent vaccine candidate using genomic constitutive over-expression and low lipopolysaccharide levels in Escherichia coli cells. Microb Cell Fact 2021; 20:227. [PMID: 34930257 PMCID: PMC8686089 DOI: 10.1186/s12934-021-01719-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Accepted: 12/10/2021] [Indexed: 02/06/2023] Open
Abstract
Background The various advantages associated with the growth properties of Escherichia coli have justified their use in the production of genetically engineered vaccines. However, endotoxin contamination, plasmid vector instability, and the requirement for antibiotic supplementation are frequent bottlenecks in the successful production of recombinant proteins that are safe for industrial-scaled applications. To overcome these drawbacks, we focused on interrupting the expression of several key genes involved in the synthesis of lipopolysaccharide (LPS), an endotoxin frequently responsible for toxicity in recombinant proteins, to eliminate endotoxin contamination and produce better recombinant proteins with E. coli. Results Of 8 potential target genes associated with LPS synthesis, we successfully constructed 7 LPS biosynthesis-defective recombinant strains to reduce the production of LPS. The endotoxin residue in the protein products from these modified E. coli strains were about two orders of magnitude lower than that produced by the wild-type strain. Further, we found that 6 loci—lpxM, lpxP, lpxL, eptA, gutQ and kdsD—were suitable for chromosomal integrated expression of HPV L1 protein. We found that a single copy of the expression cassette conferred stable expression during long-term antibiotic-free cultivation as compared with the more variable protein production from plasmid-based expression. In large-scale fermentation, we found that recombinant strains bearing 3 to 5 copies of the expression cassette had 1.5- to 2-fold higher overall expression along with lower endotoxin levels as compared with the parental ER2566 strain. Finally, we engineered and constructed 9 recombinant E. coli strains for the later production of an HPV 9-valent capsid protein with desirable purity, VLP morphology, and antigenicity. Conclusions Reengineering the LPS synthesis loci in the E. coli ER2566 strain through chromosomal integration of expression cassettes has potential uses for the production of a 9-valent HPV vaccine candidate, with markedly reduced residual endotoxin levels. Our results offer a new strategy for recombinant E. coli strain construction, engineering, and the development of suitable recombinant protein drugs. Supplementary Information The online version contains supplementary material available at 10.1186/s12934-021-01719-8.
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Zhang J, Jin B, Hong K, Lv Y, Wang Z, Chen T. Cell Catalysis of Citrate to Itaconate by Engineered Halomonas bluephagenesis. ACS Synth Biol 2021; 10:3017-3027. [PMID: 34704752 DOI: 10.1021/acssynbio.1c00320] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Itaconic acid (IA), an important five-carbon unsaturated dicarboxylic acid, is one of the top 12 renewable chemicals with an urgent need to reduce industrial production costs. Halomonas bluephagenesis, which possesses the potential for cost-effective bioproduction of chemicals and organic acids due to its ability to grow under open nonsterile conditions and high tolerance to organic acid salts, was genetically engineered and used to produce IA from citrate by a cell catalytic strategy. Here, two essential genes (cis-aconitate decarboxylase encoding gene cadA and aconitase (ACN) encoding gene acn) were introduced into H. bluephagenesis to construct an IA biosynthesis pathway. Further engineering modifications including coexpression of molecular chaperones GroESL, increasing the copy number of the gene encoding rate-limiting enzyme ACN, and weakening the competing pathway were implemented. Under the optimized condition for the cell catalytic system, the engineered strain TAZI-08 produced 451.45 mM (58.73 g/L) IA from 500 mM citrate, with 93.24% conversion in 36 h and a productivity of 1.63 g/(L h). An intermittent feeding strategy further increased the IA titer to 488.86 mM (63.60 g/L). The IA titer and citrate conversion in H. bluephagenesis are the highest among heterologous hosts reported so far, demonstrating that this strain is a suitable chassis for hyperproduction of IA.
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Affiliation(s)
- Jing Zhang
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China
- Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin 300072, China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
| | - Biao Jin
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China
- Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin 300072, China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
| | - Kunqiang Hong
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China
- Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin 300072, China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
| | - You Lv
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Zhiwen Wang
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China
- Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin 300072, China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
| | - Tao Chen
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China
- Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin 300072, China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
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Lin Y, Guan Y, Dong X, Ma Y, Wang X, Leng Y, Wu F, Ye JW, Chen GQ. Engineering Halomonas bluephagenesis as a chassis for bioproduction from starch. Metab Eng 2021; 64:134-145. [PMID: 33577951 DOI: 10.1016/j.ymben.2021.01.014] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2020] [Revised: 12/22/2020] [Accepted: 01/30/2021] [Indexed: 10/22/2022]
Abstract
Halomonas bluephagenesis has been successfully engineered to produce multiple products under open unsterile conditions utilizing costly glucose as the carbon source. It would be highly interesting to investigate if H. bluephagenesis, a chassis for the Next Generation Industrial Biotechnology (NGIB), can be reconstructed to become an extracellular hydrolytic enzyme producer replacing traditional enzyme producer Bacillus spp. If successful, cost of bulk hydrolytic enzymes such as amylase and protease, can be significantly reduced due to the contamination resistant and robust growth of H. bluephagenesis. This also allows H. bluephagenesis to be able to grow on low cost substrates such as starch. The modularized secretion machinery was constructed and fine-tuned in H. bluephagenesis using codon-optimized gene encoding α-amylase from Bacillus lichenifomis. Screening of suitable signal peptides and linkers based on super-fold green fluorescence protein (sfGFP) for enhanced expression in H. bluephagenesis resulted in a 7-fold enhancement of sfGFP secretion in the recombinant H. bluephagenesis. When the gene encoding sfGFP was replaced by α-amylase encoding gene, recombinant H. bluephagenesis harboring this amylase secretory system was able to produce poly(3-hydroxybutyrate) (PHB), poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (P34HB), poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), ectoine and L-threonine utilizing starch as the growth substrate, respectively. Recombinant H. bluephagenesis TN04 expressing genes encoding α-amylase and glucosidase on chromosome and plasmid-based systems, respectively, was able to grow on corn starch to approximately 10 g/L cell dry weight containing 51% PHB when grown in shake flasks. H. bluephagenesis was demonstrated to be a chassis for productions of extracellular enzymes and multiple products from low cost corn starch.
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Affiliation(s)
- Yina Lin
- Center for Synthetic and Systems Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China; Tsinghua-Peking Center for Life Sciences, 100084, China
| | - Yuying Guan
- Center for Synthetic and Systems Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Xu Dong
- Center for Synthetic and Systems Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Yueyuan Ma
- Center for Synthetic and Systems Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Xuan Wang
- Center for Synthetic and Systems Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China; Tsinghua-Peking Center for Life Sciences, 100084, China
| | - Yuchen Leng
- Center for Synthetic and Systems Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Fuqing Wu
- Center for Synthetic and Systems Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China; Tsinghua-Peking Center for Life Sciences, 100084, China; MOE Key Lab of Industrial Biocatalysis, Tsinghua University, Beijing, 100084, China
| | - Jian-Wen Ye
- Center for Synthetic and Systems Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China; Tsinghua-Peking Center for Life Sciences, 100084, China; Center for Materials Synthetic Biology, CAS Key Laboratory of Quantitative Engineering Biology, Shenzhen Institute of Synthetic Biology, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China.
| | - Guo-Qiang Chen
- Center for Synthetic and Systems Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China; Tsinghua-Peking Center for Life Sciences, 100084, China; MOE Key Lab of Industrial Biocatalysis, Tsinghua University, Beijing, 100084, China.
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Trisrivirat D, Hughes JMX, Hoeven R, Faulkner M, Toogood H, Chaiyen P, Scrutton NS. Promoter engineering for microbial bio-alkane gas production. Synth Biol (Oxf) 2020; 5:ysaa022. [PMID: 33263086 PMCID: PMC7680561 DOI: 10.1093/synbio/ysaa022] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 10/07/2020] [Accepted: 10/08/2020] [Indexed: 12/29/2022] Open
Abstract
Successful industrial biotechnological solutions to biofuels and other chemicals production rely on effective competition with existing lower-cost natural sources and synthetic chemistry approaches enabled by adopting low-cost bioreactors and processes. This is achievable by mobilizing Halomonas as a next generation industrial chassis, which can be cultivated under non-sterile conditions. To increase the cost effectiveness of an existing sustainable low carbon bio-propane production strategy, we designed and screened a constitutive promoter library based on the known strong porin promoter from Halomonas. Comparative studies were performed between Escherichia coli and Halomonas using the reporter gene red fluorescent protein (RFP). Later studies with a fatty acid photodecarboxylase-RFP fusion protein demonstrated tuneable propane production in Halomonas and E. coli, with an ∼8-fold improvement in yield over comparable isopropyl-β-D-thiogalactoside-inducible systems. This novel set of promoters is a useful addition to the synthetic biology toolbox for future engineering of Halomonas to make chemicals and fuels.
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Affiliation(s)
- Duangthip Trisrivirat
- Department of Chemistry, School of Natural Sciences, EPSRC/BBSRC Future Biomanufacturing Research Hub, BBSRC/EPSRC Synthetic Biology Research Centre SYNBIOCHEM Manchester Institute of Biotechnology, The University of Manchester, Manchester M1 7DN, UK.,School of Biomolecular Science and Engineering, Vidyasirimedhi Inistitute of Science and Technology (VISTEC), Rayong 21210, Thailand.,Department of Biochemistry, Faculty of Science, Mahidol University, Bangkok 10400, Thailand
| | - John M X Hughes
- Department of Chemistry, School of Natural Sciences, EPSRC/BBSRC Future Biomanufacturing Research Hub, BBSRC/EPSRC Synthetic Biology Research Centre SYNBIOCHEM Manchester Institute of Biotechnology, The University of Manchester, Manchester M1 7DN, UK
| | - Robin Hoeven
- Department of Chemistry, School of Natural Sciences, EPSRC/BBSRC Future Biomanufacturing Research Hub, BBSRC/EPSRC Synthetic Biology Research Centre SYNBIOCHEM Manchester Institute of Biotechnology, The University of Manchester, Manchester M1 7DN, UK
| | - Matthew Faulkner
- Department of Chemistry, School of Natural Sciences, EPSRC/BBSRC Future Biomanufacturing Research Hub, BBSRC/EPSRC Synthetic Biology Research Centre SYNBIOCHEM Manchester Institute of Biotechnology, The University of Manchester, Manchester M1 7DN, UK
| | - Helen Toogood
- Department of Chemistry, School of Natural Sciences, EPSRC/BBSRC Future Biomanufacturing Research Hub, BBSRC/EPSRC Synthetic Biology Research Centre SYNBIOCHEM Manchester Institute of Biotechnology, The University of Manchester, Manchester M1 7DN, UK
| | - Pimchai Chaiyen
- School of Biomolecular Science and Engineering, Vidyasirimedhi Inistitute of Science and Technology (VISTEC), Rayong 21210, Thailand
| | - Nigel S Scrutton
- Department of Chemistry, School of Natural Sciences, EPSRC/BBSRC Future Biomanufacturing Research Hub, BBSRC/EPSRC Synthetic Biology Research Centre SYNBIOCHEM Manchester Institute of Biotechnology, The University of Manchester, Manchester M1 7DN, UK.,School of Biomolecular Science and Engineering, Vidyasirimedhi Inistitute of Science and Technology (VISTEC), Rayong 21210, Thailand
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Zhang X, Lin Y, Wu Q, Wang Y, Chen GQ. Synthetic Biology and Genome-Editing Tools for Improving PHA Metabolic Engineering. Trends Biotechnol 2020; 38:689-700. [DOI: 10.1016/j.tibtech.2019.10.006] [Citation(s) in RCA: 55] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 10/13/2019] [Accepted: 10/14/2019] [Indexed: 12/17/2022]
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Du H, Zhao Y, Wu F, Ouyang P, Chen J, Jiang X, Ye J, Chen GQ. Engineering Halomonas bluephagenesis for L-Threonine production. Metab Eng 2020; 60:119-127. [PMID: 32315761 DOI: 10.1016/j.ymben.2020.04.004] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 04/06/2020] [Accepted: 04/13/2020] [Indexed: 12/13/2022]
Abstract
Halophilic Halomonas bluephagenesis (H. bluephagenesis), a chassis for cost-effective Next Generation Industrial Biotechnology (NGIB), was for the first time engineered to successfully produce L-threonine, one of the aspartic family amino acids (AFAAs). Five exogenous genes including thrA*BC, lysC* and rhtC encoding homoserine dehydrogenase mutant at G433R, homoserine kinase, L-threonine synthase, aspartokinase mutant at T344M, S345L and T352I, and export transporter of threonine, respectively, were grouped into two expression modules for transcriptional tuning on plasmid- and chromosome-based systems in H. bluephagenesis, respectively, after pathway tuning debugging. Combined with deletion of import transporter or/and L-threonine dehydrogenase encoded by sstT or/and thd, respectively, the resulting recombinant H. bluephagenesis TDHR3-42-p226 produced 7.5 g/L and 33 g/L L-threonine when grown under open unsterile conditions in shake flasks and in a 7 L bioreactor, respectively. Engineering H. bluephagenesis demonstrates strong potential for production of diverse metabolic chemicals.
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Affiliation(s)
- Hetong Du
- Center for Synthetic and Systems Biology, Tsinghua University, Beijing, 100084, China; Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, 100084, China; MOE Key Lab of Bioinformatics, Center for Nano and Micro Mechanics, Tsinghua University, Beijing, 100084, China
| | - Yiqing Zhao
- Center for Synthetic and Systems Biology, Tsinghua University, Beijing, 100084, China; Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, 100084, China; MOE Key Lab of Bioinformatics, Center for Nano and Micro Mechanics, Tsinghua University, Beijing, 100084, China
| | - Fuqing Wu
- Center for Synthetic and Systems Biology, Tsinghua University, Beijing, 100084, China; Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, 100084, China; MOE Key Lab of Bioinformatics, Center for Nano and Micro Mechanics, Tsinghua University, Beijing, 100084, China
| | - Peifei Ouyang
- China Fortune Land Development Industrial Investment Co. Ltd., Beijing, 100027, China; Research Center for Healthcare Management, School of Economics and Management, Tsinghua University, China
| | - Jinchun Chen
- Center for Synthetic and Systems Biology, Tsinghua University, Beijing, 100084, China; Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, 100084, China; MOE Key Lab of Bioinformatics, Center for Nano and Micro Mechanics, Tsinghua University, Beijing, 100084, China
| | - Xiaoran Jiang
- Center for Synthetic and Systems Biology, Tsinghua University, Beijing, 100084, China; Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, 100084, China; MOE Key Lab of Bioinformatics, Center for Nano and Micro Mechanics, Tsinghua University, Beijing, 100084, China.
| | - Jianwen Ye
- Center for Synthetic and Systems Biology, Tsinghua University, Beijing, 100084, China; Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, 100084, China; MOE Key Lab of Bioinformatics, Center for Nano and Micro Mechanics, Tsinghua University, Beijing, 100084, China.
| | - Guo-Qiang Chen
- Center for Synthetic and Systems Biology, Tsinghua University, Beijing, 100084, China; Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, 100084, China; MOE Key Lab of Bioinformatics, Center for Nano and Micro Mechanics, Tsinghua University, Beijing, 100084, China; MOE Key Lab of Industrial Biocatalysis, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China.
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12
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Mitra R, Xu T, Xiang H, Han J. Current developments on polyhydroxyalkanoates synthesis by using halophiles as a promising cell factory. Microb Cell Fact 2020; 19:86. [PMID: 32264891 PMCID: PMC7137286 DOI: 10.1186/s12934-020-01342-z] [Citation(s) in RCA: 95] [Impact Index Per Article: 23.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2020] [Accepted: 03/26/2020] [Indexed: 11/17/2022] Open
Abstract
Plastic pollution is a severe threat to our environment which necessitates implementation of bioplastics to realize sustainable development for a green world. Polyhydroxyalkanoates (PHA) represent one of the potential candidates for these bioplastics. However, a major challenge faced by PHA is the high production cost which limits its commercial application. Halophiles are considered to be a promising cell factory for PHA synthesis due to its several unique characteristics including high salinity requirement preventing microbial contamination, high intracellular osmotic pressure allowing easy cell lysis for PHA recovery, and capability to utilize wide spectrum of low-cost substrates. Optimization of fermentation parameters has made it plausible to achieve large-scale production at low cost by using halophiles. Further deeper insights into halophiles have revealed the existence of diversified and even novel PHA synthetic pathways within different halophilic species that greatly affects PHA type. Thus, precise metabolic engineering of halophiles with the help of advanced tools and strategies have led to more efficient microbial cell factory for PHA production. This review is an endeavour to summarize the various research achievements in these areas which will help the readers to understand the current developments as well as the future efforts in PHA research.
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Affiliation(s)
- Ruchira Mitra
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, People's Republic of China.,International College, University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China
| | - Tong Xu
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, People's Republic of China
| | - Hua Xiang
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, People's Republic of China. .,College of Life Science, University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China.
| | - Jing Han
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, People's Republic of China. .,College of Life Science, University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China.
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13
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Amer M, Hoeven R, Kelly P, Faulkner M, Smith MH, Toogood HS, Scrutton NS. Renewable and tuneable bio-LPG blends derived from amino acids. BIOTECHNOLOGY FOR BIOFUELS 2020; 13:125. [PMID: 32684978 PMCID: PMC7362463 DOI: 10.1186/s13068-020-01766-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 07/08/2020] [Indexed: 05/03/2023]
Abstract
BACKGROUND Microbial biorefinery approaches are beginning to define renewable and sustainable routes to clean-burning and non-fossil fuel-derived gaseous alkanes (known as 'bio-LPG'). The most promising strategies have used a terminal fatty acid photodecarboxylase, enabling light-driven propane production from externally fed waste butyric acid. Use of Halomonas (a robust extremophile microbial chassis) with these pathways has enabled bio-LPG production under non-sterile conditions and using waste biomass as the carbon source. Here, we describe new engineering approaches to produce next-generation pathways that use amino acids as fuel precursors for bio-LPG production (propane, butane and isobutane blends). RESULTS Multiple pathways from the amino acids valine, leucine and isoleucine were designed in E. coli for the production of propane, isobutane and butane, respectively. A branched-chain keto acid decarboxylase-dependent pathway utilising fatty acid photodecarboxylase was the most effective route, generating higher alkane gas titres over alternative routes requiring coenzyme A and/or aldehyde deformylating oxygenase. Isobutane was the major gas produced in standard (mixed amino acid) medium, however valine supplementation led to primarily propane production. Transitioning pathways into Halomonas strain TQ10 enabled fermentative production of mixed alkane gases under non-sterile conditions on simple carbon sources. Chromosomal integration of inducible (~ 180 mg/g cells/day) and constitutive (~ 30 mg/g cells/day) pathways into Halomonas generated production strains shown to be stable for up to 7 days. CONCLUSIONS This study highlights new microbial pathways for the production of clean-burning bio-LPG fuels from amino acids. The use of stable Halomonas production strains could lead to gas production in the field under non-sterile conditions following process optimisation.
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Affiliation(s)
- Mohamed Amer
- EPSRC/BBSRC Future Biomanufacturing Research Hub, BBSRC/EPSRC, Synthetic Biology Research Centre SYNBIOCHEM Manchester Institute of Biotechnology and School of Chemistry, The University of Manchester, Manchester, M1 7DN UK
| | - Robin Hoeven
- EPSRC/BBSRC Future Biomanufacturing Research Hub, BBSRC/EPSRC, Synthetic Biology Research Centre SYNBIOCHEM Manchester Institute of Biotechnology and School of Chemistry, The University of Manchester, Manchester, M1 7DN UK
| | - Paul Kelly
- EPSRC/BBSRC Future Biomanufacturing Research Hub, BBSRC/EPSRC, Synthetic Biology Research Centre SYNBIOCHEM Manchester Institute of Biotechnology and School of Chemistry, The University of Manchester, Manchester, M1 7DN UK
| | - Matthew Faulkner
- EPSRC/BBSRC Future Biomanufacturing Research Hub, BBSRC/EPSRC, Synthetic Biology Research Centre SYNBIOCHEM Manchester Institute of Biotechnology and School of Chemistry, The University of Manchester, Manchester, M1 7DN UK
| | - Michael H. Smith
- C3 Biotechnologies Ltd, The Railway Goods Yard, Middleton-in-Lonsdale, Lancashire, LA6 2NF UK
| | - Helen S. Toogood
- EPSRC/BBSRC Future Biomanufacturing Research Hub, BBSRC/EPSRC, Synthetic Biology Research Centre SYNBIOCHEM Manchester Institute of Biotechnology and School of Chemistry, The University of Manchester, Manchester, M1 7DN UK
| | - Nigel S. Scrutton
- EPSRC/BBSRC Future Biomanufacturing Research Hub, BBSRC/EPSRC, Synthetic Biology Research Centre SYNBIOCHEM Manchester Institute of Biotechnology and School of Chemistry, The University of Manchester, Manchester, M1 7DN UK
- C3 Biotechnologies Ltd, The Railway Goods Yard, Middleton-in-Lonsdale, Lancashire, LA6 2NF UK
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14
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Yu L, Wu F, Chen G. Next‐Generation Industrial Biotechnology‐Transforming the Current Industrial Biotechnology into Competitive Processes. Biotechnol J 2019; 14:e1800437. [DOI: 10.1002/biot.201800437] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2018] [Revised: 02/01/2019] [Indexed: 01/16/2023]
Affiliation(s)
- Lin‐Ping Yu
- Ministry of Education Key Laboratory for Bioinformatics, School of Life SciencesTsinghua University New Biology Building 100084 Beijing China
- Center for Synthetic and Systems BiologyTsinghua University New Biology Building 100084 Beijing China
- Tsinghua‐Peking Center for Life SciencesTsinghua University New Biology Building 100084 Beijing China
| | - Fu‐Qing Wu
- Ministry of Education Key Laboratory for Bioinformatics, School of Life SciencesTsinghua University New Biology Building 100084 Beijing China
- Center for Synthetic and Systems BiologyTsinghua University New Biology Building 100084 Beijing China
- Tsinghua‐Peking Center for Life SciencesTsinghua University New Biology Building 100084 Beijing China
| | - Guo‐Qiang Chen
- Ministry of Education Key Laboratory for Bioinformatics, School of Life SciencesTsinghua University New Biology Building 100084 Beijing China
- Center for Synthetic and Systems BiologyTsinghua University New Biology Building 100084 Beijing China
- Tsinghua‐Peking Center for Life SciencesTsinghua University New Biology Building 100084 Beijing China
- Manchester Institute of Biotechnology, Centre for Synthetic BiologyThe University of Manchester 131 Princess Street Manchester M1 7DN UK
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15
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Chromosome engineering of the TCA cycle in Halomonas bluephagenesis for production of copolymers of 3-hydroxybutyrate and 3-hydroxyvalerate (PHBV). Metab Eng 2019; 54:69-82. [PMID: 30914380 DOI: 10.1016/j.ymben.2019.03.006] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Revised: 03/12/2019] [Accepted: 03/16/2019] [Indexed: 01/08/2023]
Abstract
Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) is a promising biopolyester with good mechanical properties and biodegradability. Large-scale production of PHBV is still hindered by the high production cost. CRISPR/Cas9 method was used to engineer the TCA cycle in Halomonas bluephagenesis on its chromosome for production of PHBV from glucose as a sole carbon source. Two TCA cycle related genes sdhE and icl encoding succinate dehydrogenase assembly factor 2 and isocitrate lysase were deleted, respectively, in H. bluephagenesis TD08AB containing PHBV synthesis genes on the chromosome, to channel more flux to increase the 3-hydroxyvalerate (3HV) ratio of PHBV. Due to a poor growth behavior of the mutant strains, H. bluephagenesis TY194 equipped with a medium strength Pporin-194 promoter was selected for further studies. The sdhE and/or icl mutant strains of H. bluephagenesis TY194 were constructed to show enhanced cell growth, PHBV synthesis and 3HV molar ratio. Gluconate was used to activate ED pathway and thus TCA cycle to increase 3HV content. H. bluephagenesis TY194 (ΔsdhEΔicl) was found to synthesize 17mol% 3HV in PHBV. Supported by the synergetic function of phosphoenolpyruvate carboxylase and Vitreoscilla hemoglobin encoded by genes ppc and vgb inserted into the chromosome of H. bluephagenesis TY194 (ΔsdhE) serving to enhance TCA cycle activity, a series of strains were generated that could produce PHBV containing 3-18mol% 3HV using glucose as a sole carbon source. Shake flask studies showed that H. bluephagenesis TY194 (ΔsdhE, G7::Pporin-ppc) produced 6.3 g/L cell dry weight (CDW), 65% PHBV in CDW and 25mol% 3HV in PHBV when grown in glucose and gluconate. 25mol% 3HV was the highest reported via chromosomal expression system. PHBV copolymers with different 3HV molar ratios were extracted and characterized. Next-generation industrial biotechnology (NGIB) based on recombinant H. bluephagenesis grown under unsterile and continuous conditions, allows production of P(3HB-0∼25mol% 3HV) in a convenient way with reduced production complexity and cost.
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16
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Calero P, Nikel PI. Chasing bacterial chassis for metabolic engineering: a perspective review from classical to non-traditional microorganisms. Microb Biotechnol 2019; 12:98-124. [PMID: 29926529 PMCID: PMC6302729 DOI: 10.1111/1751-7915.13292] [Citation(s) in RCA: 148] [Impact Index Per Article: 29.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2018] [Revised: 05/28/2018] [Accepted: 05/29/2018] [Indexed: 12/27/2022] Open
Abstract
The last few years have witnessed an unprecedented increase in the number of novel bacterial species that hold potential to be used for metabolic engineering. Historically, however, only a handful of bacteria have attained the acceptance and widespread use that are needed to fulfil the needs of industrial bioproduction - and only for the synthesis of very few, structurally simple compounds. One of the reasons for this unfortunate circumstance has been the dearth of tools for targeted genome engineering of bacterial chassis, and, nowadays, synthetic biology is significantly helping to bridge such knowledge gap. Against this background, in this review, we discuss the state of the art in the rational design and construction of robust bacterial chassis for metabolic engineering, presenting key examples of bacterial species that have secured a place in industrial bioproduction. The emergence of novel bacterial chassis is also considered at the light of the unique properties of their physiology and metabolism, and the practical applications in which they are expected to outperform other microbial platforms. Emerging opportunities, essential strategies to enable successful development of industrial phenotypes, and major challenges in the field of bacterial chassis development are also discussed, outlining the solutions that contemporary synthetic biology-guided metabolic engineering offers to tackle these issues.
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Affiliation(s)
- Patricia Calero
- The Novo Nordisk Foundation Center for BiosustainabilityTechnical University of Denmark2800Kongens LyngbyDenmark
| | - Pablo I. Nikel
- The Novo Nordisk Foundation Center for BiosustainabilityTechnical University of Denmark2800Kongens LyngbyDenmark
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17
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Shen R, Yin J, Ye JW, Xiang RJ, Ning ZY, Huang WZ, Chen GQ. Promoter Engineering for Enhanced P(3HB- co-4HB) Production by Halomonas bluephagenesis. ACS Synth Biol 2018; 7:1897-1906. [PMID: 30024739 DOI: 10.1021/acssynbio.8b00102] [Citation(s) in RCA: 68] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Promoters for the expression of heterologous genes in Halomonas bluephagenesis are quite limited, and many heterologous promoters function abnormally in this strain. Pporin, a promoter of the strongest expressed protein porin in H. bluephagenesis, is one of the few promoters available for heterologous expression in H. bluephagenesis, yet it has a fixed transcriptional activity that cannot be tuned. A stable promoter library with a wide range of activities is urgently needed. This study reports an approach to construct a promoter library based on the Pporin core region, namely, from the -35 box to the transcription start site, a spacer and an insulator. Saturation mutagenesis was conducted inside the promoter core region to significantly increase the diversity within the promoter library. The promoter library worked in both E. coli and H. bluephagenesis, covering a wide range of relative transcriptional strengths from 40 to 140 000. The library is therefore suitable for the transcription of many different heterologous genes, serving as a platform for protein expression and fine-tuned metabolic engineering of H. bluephagenesis TD01 and its derivative strains. H. bluephagenesis strains harboring the orfZ gene encoding 4HB-CoA transferase driven by selected promoters from the library were constructed, the best one produced over 100 g/L cell dry weight containing 80% poly(3-hydroxybutyrate- co-11 mol % 4-hydroxybutyrate) with a productivity of 1.59 g/L/h after 50 h growth under nonsterile fed-batch conditions. This strain was found the best for P(3HB- co-4HB) production in the laboratory scale.
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Affiliation(s)
- Rui Shen
- MOE Key Lab of Bioinformatics, School of Life Science, Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China
| | - Jin Yin
- MOE Key Lab of Bioinformatics, School of Life Science, Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China
| | - Jian-Wen Ye
- MOE Key Lab of Bioinformatics, School of Life Science, Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China
| | | | - Zhi-Yu Ning
- MOE Key Lab of Bioinformatics, School of Life Science, Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China
| | - Wu-Zhe Huang
- MOE Key Lab of Bioinformatics, School of Life Science, Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China
| | - Guo-Qiang Chen
- MOE Key Lab of Bioinformatics, School of Life Science, Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China
- Center for Synthetic and Systems Biology, Tsinghua University, Beijing 100084, China
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18
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Ou B, Garcia C, Wang Y, Zhang W, Zhu G. Techniques for chromosomal integration and expression optimization in Escherichia coli. Biotechnol Bioeng 2018; 115:2467-2478. [PMID: 29981268 DOI: 10.1002/bit.26790] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Revised: 06/30/2018] [Accepted: 07/04/2018] [Indexed: 12/31/2022]
Abstract
Due to the inherent expression stability and low metabolic burden to the host cell, the expression of heterologous proteins in the bacterial chromosome in a precise and efficient manner is highly desirable for metabolic engineering and live bacterial applications. However, obtaining suitable chromosome expression levels is particularly challenging. In this minireview, we briefly present the technologies available for the integration of heterologous genes into Escherichia coli chromosomes and strategies to optimize the expression levels of heterologous proteins.
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Affiliation(s)
- Bingming Ou
- College of Veterinary Medicine, Yangzhou University, Yangzhou, China.,Jiangsu Co-Innovation Center for Important Animal Infectious Diseases and Zoonoses, Yangzhou, China.,Joint International Research Laboratory of Agriculture and Agri-Product Safety of Ministry of Education of China, Yangzhou University, Yangzhou, China.,Diagnostic Medicine/Pathobiology, Kansas State University College of Veterinary Medicine, Manhattan, Kansas
| | - Carolina Garcia
- Diagnostic Medicine/Pathobiology, Kansas State University College of Veterinary Medicine, Manhattan, Kansas
| | - Yejun Wang
- Department of Cell Biology and Genetics, School of Basic Medical Sciences, Shenzhen University Health Science Center, Shenzhen, China
| | - Weiping Zhang
- Diagnostic Medicine/Pathobiology, Kansas State University College of Veterinary Medicine, Manhattan, Kansas
| | - Guoqiang Zhu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, China.,Jiangsu Co-Innovation Center for Important Animal Infectious Diseases and Zoonoses, Yangzhou, China.,Joint International Research Laboratory of Agriculture and Agri-Product Safety of Ministry of Education of China, Yangzhou University, Yangzhou, China
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19
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Reprogramming Halomonas for industrial production of chemicals. J Ind Microbiol Biotechnol 2018; 45:545-554. [PMID: 29948194 DOI: 10.1007/s10295-018-2055-z] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2018] [Accepted: 05/31/2018] [Indexed: 12/26/2022]
Abstract
Halomonas spp. are able to grow under a high salt concentration at alkali pH, they are able to resist contamination by other microbes. Development of Halomonas spp. as platform production strains for the next-generation industrial biotechnology (NGIB) is intensively studied. Among Halomonas spp., Halomonas bluephagenesis is the best studied one with available engineering tools and methods to reprogram it for production of various polyhydroxyalkanoates, proteins, and chemicals. Due to its contamination resistance, H. bluephagenesis can be grown under open and continuous processes not just in the labs but also in at least 1000 L fermentor scale. It is expected that NGIB based on Halomonas spp. be able to engineer for production of increasing number of products in a competitive manner.
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20
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Xiao-Ran J, Jin Y, Xiangbin C, Guo-Qiang C. Halomonas and Pathway Engineering for Bioplastics Production. Methods Enzymol 2018; 608:309-328. [PMID: 30173767 DOI: 10.1016/bs.mie.2018.04.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Traditional microbial chassis, including Escherichia coli, Bacillus subtilis, Ralstonia eutropha, and Pseudomonas putida, are grown under neutral pH and mild osmotic pressure for production of chemicals and materials. They tend to be contaminated easily by many microorganisms. To address this issue, next-generation industrial biotechnology employing halophilic Halomonas spp. has been developed for production of bioplastics polyhydroxyalkanoates (PHAs) and other chemicals. Halomonas spp. that can be grown contamination free under open and unsterile condition at alkali pH and high NaCl have been engineered to produce several PHA polymers in elongated or enlarged cells. New pathways can also be constructed both in plasmids and on chromosomes for Halomonas spp. Synthetic biology approaches and parts have been developed for Halomonas spp., allowing better control of their growth and product formation as well as morphology adjustment. Halomonas spp. and their synthetic biology will play an increasingly important role for industrial production of large volume chemicals.
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Affiliation(s)
- Jiang Xiao-Ran
- MOE Lab of Bioinformatics, School of Life Sciences, Tsinghua University, Beijing, China; Center for Synthetic and Systems Biology, Tsinghua University, Beijing, China; Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing, China
| | - Yin Jin
- MOE Lab of Bioinformatics, School of Life Sciences, Tsinghua University, Beijing, China; Center for Synthetic and Systems Biology, Tsinghua University, Beijing, China; Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing, China
| | - Chen Xiangbin
- MOE Lab of Bioinformatics, School of Life Sciences, Tsinghua University, Beijing, China; Center for Synthetic and Systems Biology, Tsinghua University, Beijing, China; Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing, China
| | - Chen Guo-Qiang
- MOE Lab of Bioinformatics, School of Life Sciences, Tsinghua University, Beijing, China; Center for Synthetic and Systems Biology, Tsinghua University, Beijing, China; Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing, China; Manchester Institute of Biotechnology, Centre for Synthetic Biology, The University of Manchester, Manchester, United Kingdom.
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21
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Construction of Halomonas bluephagenesis capable of high cell density growth for efficient PHA production. Appl Microbiol Biotechnol 2018; 102:4499-4510. [DOI: 10.1007/s00253-018-8931-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Revised: 03/07/2018] [Accepted: 03/10/2018] [Indexed: 12/13/2022]
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22
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Next generation industrial biotechnology based on extremophilic bacteria. Curr Opin Biotechnol 2018; 50:94-100. [DOI: 10.1016/j.copbio.2017.11.016] [Citation(s) in RCA: 186] [Impact Index Per Article: 31.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Revised: 11/24/2017] [Accepted: 11/27/2017] [Indexed: 01/13/2023]
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23
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Ye J, Hu D, Che X, Jiang X, Li T, Chen J, Zhang HM, Chen GQ. Engineering of Halomonas bluephagenesis for low cost production of poly(3-hydroxybutyrate-co-4-hydroxybutyrate) from glucose. Metab Eng 2018; 47:143-152. [PMID: 29551476 DOI: 10.1016/j.ymben.2018.03.013] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Revised: 03/13/2018] [Accepted: 03/14/2018] [Indexed: 01/01/2023]
Abstract
Poly(3-hydroxybutyrate-co-4-hydroxybutyrate) [P(3HB-co-4HB)] is one of the most promising biomaterials expected to be used in a wide range of scenarios. However, its large-scale production is still hindered by the high cost. Here we report the engineering of Halomonas bluephagenesis as a low-cost platform for non-sterile and continuous fermentative production of P(3HB-co-4HB) from glucose. Two interrelated 4-hydroxybutyrate (4HB) biosynthesis pathways were constructed to guarantee 4HB monomer supply for P(3HB-co-4HB) synthesis by working in concert with 3-hydroxybutyrate (3HB) pathway. Interestingly, only 0.17 mol% 4HB in the copolymer was obtained during shake flask studies. Pathway debugging using structurally related carbon source located the failure as insufficient 4HB accumulation. Further whole genome sequencing and comparative genomic analysis identified multiple orthologs of succinate semialdehyde dehydrogenase (gabD) that may compete with 4HB synthesis flux in H. bluephagenesis. Accordingly, combinatory gene-knockout strains were constructed and characterized, through which the molar fraction of 4HB was increased by 24-fold in shake flask studies. The best-performing strain was grown on glucose as the single carbon source for 60 h under non-sterile conditions in a 7-L bioreactor, reaching 26.3 g/L of dry cell mass containing 60.5% P(3HB-co-17.04 mol%4HB). Besides, 4HB molar fraction in the copolymer can be tuned from 13 mol% to 25 mol% by controlling the residual glucose concentration in the cultures. This is the first study to achieve the production of P(3HB-co-4HB) from only glucose using Halomonas.
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Affiliation(s)
- Jianwen Ye
- MOE Key Lab of Bioinformatics, School of Life Sciences, Tsinghua University, Beijing 100084, China; Center for Synthetic and Systems Biology, Tsinghua University, Beijing 100084, China; Center for Nano and Micro-Mechanics, Tsinghua University, Beijing 100084, China
| | - Dingkai Hu
- MOE Key Lab of Bioinformatics, School of Life Sciences, Tsinghua University, Beijing 100084, China; Center for Synthetic and Systems Biology, Tsinghua University, Beijing 100084, China
| | - Xuemei Che
- MOE Key Lab of Bioinformatics, School of Life Sciences, Tsinghua University, Beijing 100084, China; Center for Synthetic and Systems Biology, Tsinghua University, Beijing 100084, China; Center for Nano and Micro-Mechanics, Tsinghua University, Beijing 100084, China
| | - Xiaoran Jiang
- MOE Key Lab of Bioinformatics, School of Life Sciences, Tsinghua University, Beijing 100084, China; Center for Synthetic and Systems Biology, Tsinghua University, Beijing 100084, China
| | - Teng Li
- Bluepha Co., Ltd., Beijing 102206, China
| | - Jinchun Chen
- MOE Key Lab of Bioinformatics, School of Life Sciences, Tsinghua University, Beijing 100084, China; Center for Synthetic and Systems Biology, Tsinghua University, Beijing 100084, China
| | | | - Guo-Qiang Chen
- MOE Key Lab of Bioinformatics, School of Life Sciences, Tsinghua University, Beijing 100084, China; Center for Synthetic and Systems Biology, Tsinghua University, Beijing 100084, China; Center for Nano and Micro-Mechanics, Tsinghua University, Beijing 100084, China.
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24
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Ouyang P, Wang H, Hajnal I, Wu Q, Guo Y, Chen GQ. Increasing oxygen availability for improving poly(3-hydroxybutyrate) production by Halomonas. Metab Eng 2018; 45:20-31. [DOI: 10.1016/j.ymben.2017.11.006] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Revised: 11/09/2017] [Accepted: 11/12/2017] [Indexed: 01/01/2023]
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25
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Chen GQ, Jiang XR. Engineering microorganisms for improving polyhydroxyalkanoate biosynthesis. Curr Opin Biotechnol 2017; 53:20-25. [PMID: 29169056 DOI: 10.1016/j.copbio.2017.10.008] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Revised: 10/27/2017] [Accepted: 10/30/2017] [Indexed: 01/22/2023]
Abstract
Biosynthesis of polyhydroxyalkanoates (PHA) has been studied since the 1920s. The biosynthesis pathways have been well understood and various attempts have been made to improve the PHA biosynthesis efficiency. Recent progresses have been focused on systematic improvements on PHA biosynthesis including changing growth pattern for rapid proliferation, engineering to enlarge cell sizes for more PHA accumulation space, reprogramming the PHA synthesis pathways using optimized RBS and promoter, redirecting metabolic flux to PHA synthesis using CRISPR/Cas9 tools, and very importantly, the employment of non-traditional host such as halophiles for reduced complexity on PHA production. All of the efforts should lead to ultrahigh PHA accumulation, controllable PHA compositions and molecular weights, open and continuous PHA production with gravity separation processes, resulting in competitive PHA production cost.
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Affiliation(s)
- Guo-Qiang Chen
- MOE Lab of Bioinformatics, School of Life Sciences, Tsinghua University, Beijing 100084, China; Center for Synthetic and Systems Biology, Tsinghua University, Beijing 100084, China; Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China; Manchester Institute of Biotechnology, Centre for Synthetic Biology, The University of Manchester, 131 Princess Street, Manchester M1 7DN, UK.
| | - Xiao-Ran Jiang
- MOE Lab of Bioinformatics, School of Life Sciences, Tsinghua University, Beijing 100084, China; Center for Synthetic and Systems Biology, Tsinghua University, Beijing 100084, China; Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China
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Chen X, Yin J, Ye J, Zhang H, Che X, Ma Y, Li M, Wu LP, Chen GQ. Engineering Halomonas bluephagenesis TD01 for non-sterile production of poly(3-hydroxybutyrate-co-4-hydroxybutyrate). BIORESOURCE TECHNOLOGY 2017; 244:534-541. [PMID: 28803103 DOI: 10.1016/j.biortech.2017.07.149] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Revised: 07/24/2017] [Accepted: 07/25/2017] [Indexed: 06/07/2023]
Abstract
Poly(3-hydroxybutyrate-co-4-hydroxybutyrate), short as P(3HB-co-4HB), was successfully produced by engineered Halomonas bluephagenesis TD01 grown in glucose and γ-butyrolactone under open non-sterile conditions. Gene orfZ encoding 4HB-CoA transferase of Clostridium kluyveri was integrated into the genome to achieve P(3HB-co-4HB) accumulation comparable to that of strains encoding orfZ on plasmids. Fed-batch cultivations conducted in 1-L and 7-L fermentors, respectively, resulted in over 70g/L cell dry weight (CDW) containing 63% P(3HB-co-12mol% 4HB) after 48h under non-sterile conditions. The processes were further scaled up in a 1000-L pilot fermentor to reach 83g/L CDW containing 61% P(3HB-co-16mol% 4HB) in 48h, with a productivity of 1.04g/L/h, again, under non-sterile conditions. The elastic P(3HB-co-16mol% 4HB) shows an elongation at break of 1022±43%. Results demonstrate that the engineered Halomonas bluephagenesis TD01 is a suitable industrial strain for large scale production under open non-sterile conditions.
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Affiliation(s)
- Xiangbin Chen
- School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Jin Yin
- Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China
| | - Jianwen Ye
- School of Life Sciences, Tsinghua University, Beijing 100084, China
| | | | - Xuemei Che
- Center for Nano and Micro-Mechanics, Tsinghua University, Beijing 100084, China
| | - Yiming Ma
- Center for Nano and Micro-Mechanics, Tsinghua University, Beijing 100084, China
| | - Mengyi Li
- Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China
| | - Lin-Ping Wu
- Guangzhou Institute of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou 510530, China
| | - Guo-Qiang Chen
- School of Life Sciences, Tsinghua University, Beijing 100084, China; Center for Nano and Micro-Mechanics, Tsinghua University, Beijing 100084, China; Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China.
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27
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Novel T7-like expression systems used for Halomonas. Metab Eng 2017; 39:128-140. [DOI: 10.1016/j.ymben.2016.11.007] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2016] [Revised: 10/21/2016] [Accepted: 11/21/2016] [Indexed: 12/27/2022]
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28
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Lan LH, Zhao H, Chen JC, Chen GQ. EngineeringHalomonasspp. as A Low-Cost Production Host for Production of Bio-surfactant Protein PhaP. Biotechnol J 2016; 11:1595-1604. [DOI: 10.1002/biot.201600459] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Revised: 09/12/2016] [Accepted: 09/29/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Lu-Hong Lan
- School of Life Sciences; Tsinghua University; Beijing China
- Center for Synthetic and Systems Biology; Tsinghua University; Beijing China
- Tsinghua-Peking Center for Life Sciences; Tsinghua University; Beijing China
| | - Han Zhao
- School of Life Sciences; Tsinghua University; Beijing China
- Center for Synthetic and Systems Biology; Tsinghua University; Beijing China
- Tsinghua-Peking Center for Life Sciences; Tsinghua University; Beijing China
| | - Jin-Chun Chen
- School of Life Sciences; Tsinghua University; Beijing China
| | - Guo-Qiang Chen
- School of Life Sciences; Tsinghua University; Beijing China
- Center for Synthetic and Systems Biology; Tsinghua University; Beijing China
- Tsinghua-Peking Center for Life Sciences; Tsinghua University; Beijing China
- Center for Nano and Micro Mechanics; Tsinghua University; Beijing China
- MOE Key Lab of Industrial Biocatalysis, Dept Chemical Engineering; Tsinghua University; Beijing China
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29
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Enhanced production of poly-3-hydroxybutyrate by recombinant Escherichia coli containing NAD kinase and phbCAB operon. Sci China Chem 2016. [DOI: 10.1007/s11426-016-0194-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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30
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Chen GQ, Jiang XR, Guo Y. Synthetic biology of microbes synthesizing polyhydroxyalkanoates (PHA). Synth Syst Biotechnol 2016; 1:236-242. [PMID: 29062949 PMCID: PMC5625728 DOI: 10.1016/j.synbio.2016.09.006] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Revised: 09/22/2016] [Accepted: 09/30/2016] [Indexed: 11/25/2022] Open
Abstract
Microbial polyhydroxyalkanoates (PHA) have been produced as bioplastics for various purposes. Under the support of China National Basic Research 973 Project, we developed synthetic biology methods to diversify the PHA structures into homo-, random, block polymers with improved properties to better meet various application requirements. At the same time, various pathways were assembled to produce various PHA from glucose as a simple carbon source. At the end, Halomonas bacteria were reconstructed to produce PHA in changing morphology for low cost production under unsterile and continuous conditions. The synthetic biology will advance the PHA into a bio- and material industry.
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Affiliation(s)
- Guo-Qiang Chen
- School of Life Sciences, Tsinghua University, Beijing 100084, China.,Center for Synthetic and Systems Biology, Tsinghua University, Beijing 100084, China.,Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China.,Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China.,MOE Key Lab of Industrial Biocatalysis, Dept Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Xiao-Ran Jiang
- School of Life Sciences, Tsinghua University, Beijing 100084, China.,Center for Synthetic and Systems Biology, Tsinghua University, Beijing 100084, China.,Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China
| | - Yingying Guo
- School of Life Sciences, Tsinghua University, Beijing 100084, China.,Center for Synthetic and Systems Biology, Tsinghua University, Beijing 100084, China.,Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China
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31
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Li T, Li T, Ji W, Wang Q, Zhang H, Chen GQ, Lou C, Ouyang Q. Engineering of core promoter regions enables the construction of constitutive and inducible promoters in Halomonas sp. Biotechnol J 2015; 11:219-27. [DOI: 10.1002/biot.201400828] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2015] [Revised: 06/26/2015] [Accepted: 08/20/2015] [Indexed: 01/24/2023]
Affiliation(s)
- Tingting Li
- Center for Quantitative Biology and Peking-Tsinghua Joint Center for Life Sciences; Peking University; Beijing China
| | - Teng Li
- MOE Key Lab of Bioinformatics, Department of Biological Science and Biotechnology, School of Life Science, Tsinghua-Peking Joint Center for Life Sciences; Tsinghua University; Beijing China
| | - Weiyue Ji
- Center for Quantitative Biology and Peking-Tsinghua Joint Center for Life Sciences; Peking University; Beijing China
| | - Qiuyue Wang
- Center for Quantitative Biology and Peking-Tsinghua Joint Center for Life Sciences; Peking University; Beijing China
| | - Haoqian Zhang
- Center for Quantitative Biology and Peking-Tsinghua Joint Center for Life Sciences; Peking University; Beijing China
| | - Guo-Qiang Chen
- MOE Key Lab of Bioinformatics, Department of Biological Science and Biotechnology, School of Life Science, Tsinghua-Peking Joint Center for Life Sciences; Tsinghua University; Beijing China
| | - Chunbo Lou
- CAS Key Laboratory of Microbial Physiological and Metabolic Engineering, Institute of Microbiology; Chinese Academy of Sciences; Beijing China
| | - Qi Ouyang
- Center for Quantitative Biology and Peking-Tsinghua Joint Center for Life Sciences; Peking University; Beijing China
- School of Physics and the State Key Laboratory for Artificial Microstructures and Mesoscopic Physics; Peking University; Beijing China
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32
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Systems strategies for developing industrial microbial strains. Nat Biotechnol 2015; 33:1061-72. [DOI: 10.1038/nbt.3365] [Citation(s) in RCA: 357] [Impact Index Per Article: 39.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Accepted: 08/23/2015] [Indexed: 12/11/2022]
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33
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Zhao YX, Rao ZM, Xue YF, Gong P, Ji YZ, Ma YH. Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) production by Haloarchaeon Halogranum amylolyticum. Appl Microbiol Biotechnol 2015; 99:7639-49. [PMID: 25947242 DOI: 10.1007/s00253-015-6609-y] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Revised: 03/27/2015] [Accepted: 04/12/2015] [Indexed: 01/15/2023]
Abstract
Haloarchaea is an important group of polyhydroxyalkanoate (PHA)-accumulating organisms. However, few promising haloarchaeal species for economical and efficient PHA production have been reported. Here, we first discovered that Halogranum amylolyticum TNN58 could efficiently accumulate poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) with a high 3-hydroxyvalerate (3HV) fraction using glucose as carbon source. Briefly, transmission electron microscopy (TEM) analysis revealed the presence of a large number of PHA granules in the cells. Gas chromatography-mass spectrometry (GC-MS) and proton nuclear magnetic resonance ((1)H NMR) analyses showed that PHAs synthesized from glucose was PHBV. Moreover, the 3HV content reached 20.1 mol%, which is the highest 3HV fraction thus far reported, as for PHBV produced by the wild-type strains grown on unrelated carbon courses. Fermentation experiments suggested that nitrogen-limited MG medium was better than nutrient-rich NOMG and AS168 medium for PHBV production. Additionally, glucose was the most suitable carbon source among the tested carbon sources. Interestingly, PHBV accumulation was almost paralleled by cell growth and glucose consumption. By applying the fed-batch process in fermentor, the PHBV production and cell dry weight were increased by approximately eight and four times, respectively, as compared with those of the batch process in shaking flasks. The classical PHA synthase genes were successfully cloned via consensus-degenerate hybrid oligonucleotide primers (CODEHOPs) and high-efficiency thermal asymmetric interlaced (hiTAIL) PCR methods. This finding suggested that H. amylolyticum shows promising potential in the low-cost biotechnological production of PHBV after further process optimization.
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Affiliation(s)
- You-Xi Zhao
- The Key Lab of Industrial Biotechnology, the Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, People's Republic of China
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Yin J, Wang H, Fu XZ, Gao X, Wu Q, Chen GQ. Effects of chromosomal gene copy number and locations on polyhydroxyalkanoate synthesis by Escherichia coli and Halomonas sp. Appl Microbiol Biotechnol 2015; 99:5523-34. [DOI: 10.1007/s00253-015-6510-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Revised: 02/23/2015] [Accepted: 02/24/2015] [Indexed: 02/02/2023]
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