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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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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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Qin Q, Ling C, Zhao Y, Yang T, Yin J, Guo Y, Chen GQ. CRISPR/Cas9 editing genome of extremophile Halomonas spp. Metab Eng 2018; 47:219-229. [PMID: 29609045 DOI: 10.1016/j.ymben.2018.03.018] [Citation(s) in RCA: 84] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Revised: 03/29/2018] [Accepted: 03/29/2018] [Indexed: 10/17/2022]
Abstract
Extremophiles are suitable chassis for developing the next generation industrial biotechnology (NGIB) due to their resistance to microbial contamination. However, engineering extremophiles are not an easy task. Halomonas, an industrially interesting halophile able to grow under unsterile and continuous conditions in large-scale processes, can only be engineered using suicide plasmid-mediated two-step homologous recombination which is very laborious and time-consuming (up to half a year). A convenient approach for the engineering of halophiles that can possibly be extended to other extremophiles is therefore urgently required. To meet this requirement, a rapid, efficient and scarless method via CRISPR/Cas9 system was developed in this study for genome editing in Halomonas. The method achieved the highest efficiency of 100%. When eight different mutants were constructed via this special CRISPR/Cas9 method to study the combinatorial influences of four different genes on the glucose catabolism in H. bluephagenesis TD01, it took only three weeks to complete the deletion and insertion of up to 4.5 kb DNA. H. bluephagenesis was designed to produce a microbial copolymer P(3HB-co-3HV) consisting of 3-hydroxybutyrate (3HB) and 3-hydroxyvalerate (3HV). The CRISPR/Cas9 was employed to delete the prpC gene in H. bluephagenesis TD01. Shake flask studies showed that the 3HV fraction in the copolymers increased approximately 16-folds, demonstrating enhanced effectiveness of the ΔprpC mutant to synthesize PHBV. This genome engineering strategy significantly speeds up the studies on Halomonas engineering, opening up a wide area for developing NGIB.
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Affiliation(s)
- Qin Qin
- Center for Synthetic and Systems Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Chen Ling
- Center for Synthetic and Systems Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Yiqing Zhao
- Center for Synthetic and Systems Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Tian Yang
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Jin Yin
- Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Yingying Guo
- Center for Synthetic and Systems Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China; Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing 100084, 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, 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, Tsinghua University, Beijing 100084, China.
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