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Chen H, Zhang SD, Chen L, Cai Y, Zhang WJ, Song T, Wu LF. Efficient Genome Editing of Magnetospirillum magneticum AMB-1 by CRISPR-Cas9 System for Analyzing Magnetotactic Behavior. Front Microbiol 2018; 9:1569. [PMID: 30065707 PMCID: PMC6056624 DOI: 10.3389/fmicb.2018.01569] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Accepted: 06/25/2018] [Indexed: 12/17/2022] Open
Abstract
Magnetotactic bacteria (MTB) are a diverse group of microorganisms capable of using geomagnetic fields for navigation. This magnetotactic behavior can help microorganisms move toward favorable habitats for optimal growth and reproduction. A comprehensive understanding of the magnetotactic mechanism at molecular levels requires highly efficient genomic editing tools, which remain underdeveloped in MTB. Here, we adapted an engineered CRISPR-Cas9 system for efficient inactivation of genes in a widely used MTB model strain, Magnetospirillum magneticum AMB-1. By combining a nuclease-deficient Cas9 (dCas9) and single-guide RNA (sgRNA), a CRISPR interference system was successfully developed to repress amb0994 expression. Furthermore, we constructed an in-frame deletion mutant of amb0994 by developing a CRISPR-Cas9 system. This mutant produces normal magnetosomes; however, its response to abrupt magnetic field reversals is faster than wild-type strain. This behavioral difference is probably a consequence of altered flagella function, as suggested with our dynamics simulation study by modeling M. magneticum AMB-1 cell as an ellipsoid. These data indicate that, Amb0994 is involved in the cellular response to magnetic torque changes via controlling flagella. In summary, this study, besides contributing to a better understanding of magnetotaxis mechanism, demonstrated the CRISPR-(d)Cas9 system as a useful genetic tool for efficient genome editing in MTB.
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Affiliation(s)
- Haitao Chen
- Beijing Key Laboratory of Biological Electromagnetism, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
- France-China International Laboratory of Evolution and Development of Magnetotactic Multicellular Organisms, CNRS-Marseille/CAS, Beijing, China
| | - Sheng-Da Zhang
- France-China International Laboratory of Evolution and Development of Magnetotactic Multicellular Organisms, CNRS-Marseille/CAS, Beijing, China
- Deep-Sea Microbial Cell Biology, Department of Deep Sea Sciences, Institute of Deep-Sea Science and Engineering, Chinese Academy of Sciences, Sanya, China
| | - Linjie Chen
- Beijing Key Laboratory of Biological Electromagnetism, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
- France-China International Laboratory of Evolution and Development of Magnetotactic Multicellular Organisms, CNRS-Marseille/CAS, Beijing, China
| | - Yao Cai
- Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
| | - Wei-Jia Zhang
- France-China International Laboratory of Evolution and Development of Magnetotactic Multicellular Organisms, CNRS-Marseille/CAS, Beijing, China
- Deep-Sea Microbial Cell Biology, Department of Deep Sea Sciences, Institute of Deep-Sea Science and Engineering, Chinese Academy of Sciences, Sanya, China
| | - Tao Song
- Beijing Key Laboratory of Biological Electromagnetism, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
- France-China International Laboratory of Evolution and Development of Magnetotactic Multicellular Organisms, CNRS-Marseille/CAS, Beijing, China
| | - Long-Fei Wu
- France-China International Laboratory of Evolution and Development of Magnetotactic Multicellular Organisms, CNRS-Marseille/CAS, Beijing, China
- Aix Marseille Univ, Centre National de la Recherche Scientifique, LCB, Marseille, France
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Fan J, Sun Z, Zhang J, Huang Q, Yao S, Zong Y, Kohmura Y, Ishikawa T, Liu H, Jiang H. Quantitative Imaging of Single Unstained Magnetotactic Bacteria by Coherent X-ray Diffraction Microscopy. Anal Chem 2015; 87:5849-53. [DOI: 10.1021/acs.analchem.5b00746] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jiadong Fan
- State
Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Zhibin Sun
- State
Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Jian Zhang
- State
Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Qingjie Huang
- School
of Information Science and Engineering, Shandong University, Jinan 250100, China
| | - Shengkun Yao
- State
Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Yunbing Zong
- State
Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Yoshiki Kohmura
- RIKEN SPring-8 Center, 1-1-1,
Kouto, Sayo, Hyogo 679-5148, Japan
| | - Tetsuya Ishikawa
- RIKEN SPring-8 Center, 1-1-1,
Kouto, Sayo, Hyogo 679-5148, Japan
| | - Hong Liu
- State
Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Huaidong Jiang
- State
Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
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Ge X, Wang W, Han Y, Wang J, Xiong X, Zhang W. Methylovorus sp. MP688 exopolysaccharides contribute to oxidative defense and bacterial survival under adverse condition. World J Microbiol Biotechnol 2013; 29:2249-58. [DOI: 10.1007/s11274-013-1391-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2013] [Accepted: 05/31/2013] [Indexed: 11/30/2022]
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