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Chen Y, Ge P, Sun T, Feng J, Li G, Zhang J, Zhou J, Jiang J. Coexpression of Tail Fiber and Tail Protein Genes of the Cyanophage PP Using a Synthetic Genomics Approach Enhances the Salt Tolerance of Synechocystis PCC 6803. Microbiol Spectr 2023; 11:e0500922. [PMID: 37125914 PMCID: PMC10269589 DOI: 10.1128/spectrum.05009-22] [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: 12/06/2022] [Accepted: 04/10/2023] [Indexed: 05/02/2023] Open
Abstract
Cyanophages are viruses that specifically infect cyanobacteria and are capable of regulating the population densities and seasonal distributions of cyanobacteria. However, few studies have investigated the interactions between cyanophages and heterologous hosts, owing to the inability of cyanophages to infect heterologous cyanobacterial hosts. Here, a truncated artificial cyanophage genome, Syn-P4-8, was designed and assembled that contained 18 genes for viral coat assembly proteins but not genes related to host infection or DNA replication. Syn-P4-8 was transferred into the heterologous host Synechocystis sp. PCC 6803 by conjugation. The growth of strain CS-02 carrying Syn-P4-8 was significantly better than that of the control strain when grown in medium containing 5% NaCl. Only two cyanophage genes, encoding the tail protein (open reading frame 25 [ORF25]) and the tail fiber protein (ORF26), were transcribed in Synechocystis PCC 6803 grown in BG11 medium supplemented with 5% NaCl. However, expression of either ORF25 or ORF26 alone could not recover this phenotype. In addition, transcriptomic analysis revealed the presence of 334 differentially expressed genes in CS-02 compared to the control strain, corresponding to 151 downregulated and 183 upregulated genes that may affect cyanobacterial salt tolerances. In this study, synthetic biology methods were used to strengthen our understanding of the interactions between cyanophage genes and heterologous hosts. IMPORTANCE We synthesized and assembled a truncated cyanophage genome called Syn-P4-8, containing 18 genes for viral coat assembly proteins, and transferred it into a nonhost strain, Synechocystis sp. PCC 6803, to investigate interactions between Syn-P4-8 and Synechocystis PCC 6803. We found that coexpression of tail fiber and tail protein genes enhanced the salt tolerance of Synechocystis PCC 6803.
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Affiliation(s)
- Yu Chen
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
- Key Laboratory of Systems Bioengineering, Tianjin University, Tianjin, China
| | - Pingbo Ge
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
- Key Laboratory of Systems Bioengineering, Tianjin University, Tianjin, China
| | - Tao Sun
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
- Center for Biosafety Research and Strategy, Tianjin University, Tianjin, China
| | - Jia Feng
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
- Key Laboratory of Systems Bioengineering, Tianjin University, Tianjin, China
| | - Guorui Li
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
- Key Laboratory of Systems Bioengineering, Tianjin University, Tianjin, China
| | - Jiabao Zhang
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
- Key Laboratory of Systems Bioengineering, Tianjin University, Tianjin, China
| | - Jianting Zhou
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
- Key Laboratory of Systems Bioengineering, Tianjin University, Tianjin, China
- Frontier Science Center for Synthetic Biology, Tianjin University, Tianjin, China
| | - Jianlan Jiang
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
- Key Laboratory of Systems Bioengineering, Tianjin University, Tianjin, China
- Frontier Science Center for Synthetic Biology, Tianjin University, Tianjin, China
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Azuma Y, Tsuru S, Habuchi M, Takami R, Takano S, Yamamoto K, Hosoda K. Synthetic symbiosis between a cyanobacterium and a ciliate toward novel chloroplast-like endosymbiosis. Sci Rep 2023; 13:6104. [PMID: 37055487 PMCID: PMC10102011 DOI: 10.1038/s41598-023-33321-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Accepted: 04/11/2023] [Indexed: 04/15/2023] Open
Abstract
Chloroplasts are thought to have co-evolved through endosymbiosis, after a cyanobacterial-like prokaryote was engulfed by a eukaryotic cell; however, it is impossible to observe the process toward chloroplasts. In this study, we constructed an experimental symbiosis model to observe the initial stage in the process from independent organisms to a chloroplast-like organelle. Our system of synthetic symbiosis is capable of long-term coculture of two model organisms: a cyanobacterium (Synechocystis sp. PCC6803) as a symbiont and a ciliate (Tetrahymena thermophila) as a host with endocytic ability. The experimental system was clearly defined, because we used a synthetic medium and the cultures were shaken to avoid spatial complexity. We determined the experimental conditions for sustainable coculture, by analyzing population dynamics using a mathematical model. We experimentally demonstrated that the coculture was sustainable for at least 100 generations, through serial transfers. Moreover, we found that cells isolated after the serial transfer improved the probability of coexistence of both species without extinction in re-coculture. The constructed system will be useful for understanding the initial stage of primary endosymbiosis from cyanobacteria to chloroplasts, i.e., the origin of algae and plants.
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Affiliation(s)
- Yuki Azuma
- Institute for Transdisciplinary Graduate Degree Programs, Osaka University, 1-5 Yamadaoka, Suita, Osaka, 565-0871, Japan.
- Graduate School of Information Science and Technology, Osaka University, 1-5 Yamadaoka, Suita, Osaka, 565-0871, Japan.
- Division of Hygienic Chemistry, Osaka Institute of Public Health, 1-3-3 Nakamichi, Higashinari-ku, Osaka, 537-0025, Japan.
| | - Saburo Tsuru
- Universal Biology Institute, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-Ku, Tokyo, 113-0033, Japan
| | - Masumi Habuchi
- Graduate School of Frontier Biosciences, Osaka University, Suita, Osaka, 565-0871, Japan
| | - Risa Takami
- Graduate School of Information Science and Technology, Osaka University, 1-5 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Sotaro Takano
- Graduate School of Information Science and Technology, Osaka University, 1-5 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Kayo Yamamoto
- Graduate School of Information Science and Technology, Osaka University, 1-5 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Kazufumi Hosoda
- Institute for Transdisciplinary Graduate Degree Programs, Osaka University, 1-5 Yamadaoka, Suita, Osaka, 565-0871, Japan.
- RIKEN Center for Biosystems Dynamics Research, 6-2-3 Furuedai, Suita, Osaka, 565-0874, Japan.
- Center for Information and Neural Networks (CiNet), National Institute of Information and Communications Technology (NICT), Osaka, Japan.
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Baldanta S, Guevara G, Navarro-Llorens JM. SEVA-Cpf1, a CRISPR-Cas12a vector for genome editing in cyanobacteria. Microb Cell Fact 2022; 21:103. [PMID: 35643551 PMCID: PMC9148489 DOI: 10.1186/s12934-022-01830-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Accepted: 05/13/2022] [Indexed: 12/01/2022] Open
Abstract
Background Cyanobacteria are photosynthetic autotrophs that have tremendous potential for fundamental research and industrial applications due to their high metabolic plasticity and ability to grow using CO2 and sunlight. CRISPR technology using Cas9 and Cpf1 has been applied to different cyanobacteria for genome manipulations and metabolic engineering. Despite significant advances with genome editing in several cyanobacteria strains, the lack of proper genetic toolboxes is still a limiting factor compared to other model laboratory species. Among the limitations, it is essential to have versatile plasmids that could ease the benchwork when using CRISPR technology. Results In the present study, several CRISPR-Cpf1 vectors were developed for genetic manipulations in cyanobacteria using SEVA plasmids. SEVA collection is based on modular vectors that enable the exchangeability of diverse elements (e.g. origins of replication and antibiotic selection markers) and the combination with many cargo sequences for varied end-applications. Firstly, using SEVA vectors containing the broad host range RSF1010 origin we demonstrated that these vectors are replicative not only in model cyanobacteria but also in a new cyanobacterium specie, Chroococcidiopsis sp., which is different from those previously published. Then, we constructed SEVA vectors by harbouring CRISPR elements and showed that they can be easily assimilated not only by conjugation, but also by natural transformation. Finally, we used our SEVA-Cpf1 tools to delete the nblA gene in Synechocystis sp. PCC 6803, demonstrating that our plasmids can be applied for CRISPR-based genome editing technology. Conclusions The results of this study provide new CRISPR-based vectors based on the SEVA (Standard European Vector Architecture) collection that can improve editing processes using the Cpf1 nuclease in cyanobacteria. Supplementary Information The online version contains supplementary material available at 10.1186/s12934-022-01830-4.
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The Molecular Toolset and Techniques Required to Build Cyanobacterial Cell Factories. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2022. [DOI: 10.1007/10_2022_210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Iijima H, Watanabe A, Sukigara H, Shirai T, Kondo A, Osanai T. Simultaneous increases in the levels of compatible solutes by cost-effective cultivation of Synechocystis sp. PCC 6803. Biotechnol Bioeng 2020; 117:1649-1660. [PMID: 32129469 DOI: 10.1002/bit.27324] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 01/27/2020] [Accepted: 03/03/2020] [Indexed: 12/27/2022]
Abstract
Synechocystis sp. PCC 6803, a cyanobacterium widely used for basic research, is often cultivated in a synthetic medium, BG-11, in the presence of 4-(2-hydroxyethyl)-1-piperazine ethanesulfonic acid (HEPES) or 2-[[1,3-dihydroxy-2-(hydroxymethyl)propan-2-yl]amino]ethanesulfonic acid buffer. Owing to the high cost of HEPES buffer (96.9% of the total cost of BG-11 medium), the biotechnological application of BG-11 is limited. In this study, we cultured Synechocystis sp. PCC 6803 cells in BG-11 medium without HEPES buffer and examined the effects on the primary metabolism. Synechocystis sp. PCC 6803 cells could grow in BG-11 medium without HEPES buffer after adjusting for nitrogen sources and light intensity; the production rate reached 0.54 g cell dry weight·L-1 ·day-1 , exceeding that of commercial cyanobacteria and Synechocystis sp. PCC 6803 cells cultivated under other conditions. The exclusion of HEPES buffer markedly altered the metabolites in the central carbon metabolism; particularly, the levels of compatible solutes, such as sucrose, glucosylglycerol, and glutamate were increased. Although the accumulation of sucrose and glucosylglycerol under high salt conditions is antagonistic to each other, these metabolites accumulated simultaneously in cells grown in the cost-effective medium. Because these metabolites are used in industrial feedstocks, our results reveal the importance of medium composition for the production of metabolites using cyanobacteria.
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Affiliation(s)
- Hiroko Iijima
- Department of Agricultural Chemistrym School of Agriculture, Meiji University, Kawasaki, Kanagawa, Japan
| | - Atsuko Watanabe
- Department of Agricultural Chemistrym School of Agriculture, Meiji University, Kawasaki, Kanagawa, Japan
| | - Haruna Sukigara
- Department of Agricultural Chemistrym School of Agriculture, Meiji University, Kawasaki, Kanagawa, Japan
| | - Tomokazu Shirai
- RIKEN Center for Sustainable Resource Science, Yokohama, Kanagawa, Japan
| | - Akihiko Kondo
- RIKEN Center for Sustainable Resource Science, Yokohama, Kanagawa, Japan.,Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, Kobe, Japan
| | - Takashi Osanai
- Department of Agricultural Chemistrym School of Agriculture, Meiji University, Kawasaki, Kanagawa, Japan
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