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Genome engineering of the Corynebacterium glutamicum chromosome by the Extended Dual-In/Out strategy. METHODS IN MICROBIOLOGY 2022; 200:106555. [DOI: 10.1016/j.mimet.2022.106555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 08/03/2022] [Accepted: 08/03/2022] [Indexed: 11/17/2022]
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2
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Wang Q, Zhang J, Al Makishah NH, Sun X, Wen Z, Jiang Y, Yang S. Advances and Perspectives for Genome Editing Tools of Corynebacterium glutamicum. Front Microbiol 2021; 12:654058. [PMID: 33897668 PMCID: PMC8058222 DOI: 10.3389/fmicb.2021.654058] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Accepted: 03/01/2021] [Indexed: 12/17/2022] Open
Abstract
Corynebacterium glutamicum has been considered a promising synthetic biological platform for biomanufacturing and bioremediation. However, there are still some challenges in genetic manipulation of C. glutamicum. Recently, more and more genetic parts or elements (replicons, promoters, reporter genes, and selectable markers) have been mined, characterized, and applied. In addition, continuous improvement of classic molecular genetic manipulation techniques, such as allelic exchange via single/double-crossover, nuclease-mediated site-specific recombination, RecT-mediated single-chain recombination, actinophages integrase-mediated integration, and transposition mutation, has accelerated the molecular study of C. glutamicum. More importantly, emerging gene editing tools based on the CRISPR/Cas system is revolutionarily rewriting the pattern of genetic manipulation technology development for C. glutamicum, which made gene reprogramming, such as insertion, deletion, replacement, and point mutation, much more efficient and simpler. This review summarized the recent progress in molecular genetic manipulation technology development of C. glutamicum and discussed the bottlenecks and perspectives for future research of C. glutamicum as a distinctive microbial chassis.
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Affiliation(s)
- Qingzhuo Wang
- School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, Nanjing, China
| | - Jiao Zhang
- Key Laboratory of Synthetic Biology, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Naief H. Al Makishah
- Environmental Sciences Department, Faculty of Meteorology, Environment and Arid Land Agriculture, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Xiaoman Sun
- School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, Nanjing, China
| | - Zhiqiang Wen
- School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, Nanjing, China
- School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing, China
| | - Yu Jiang
- Huzhou Center of Industrial Biotechnology, Shanghai Institutes of Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Sheng Yang
- Key Laboratory of Synthetic Biology, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
- Huzhou Center of Industrial Biotechnology, Shanghai Institutes of Biological Sciences, Chinese Academy of Sciences, Shanghai, China
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Li C, Swofford CA, Rückert C, Sinskey AJ. Optimizing recombineering in Corynebacterium glutamicum. Biotechnol Bioeng 2021; 118:2255-2264. [PMID: 33650120 DOI: 10.1002/bit.27737] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 02/03/2021] [Accepted: 02/25/2021] [Indexed: 02/06/2023]
Abstract
Owing to the increasing demand for amino acids and valuable commodities that can be produced by Corynebacterium glutamicum, there is a pressing need for new rapid genome engineering tools that improve the speed and efficiency of genomic insertions, deletions, and mutations. Recombineering using the λ Red system in Escherichia coli has proven very successful at genetically modifying this organism in a quick and efficient manner, suggesting that optimizing a recombineering system for C. glutamicum will also improve the speed for genomic modifications. Here, we maximized the recombineering efficiency in C. glutamicum by testing the efficacy of seven different recombinase/exonuclease pairs for integrating single-stranded DNA and double-stranded DNA (dsDNA) into the genome. By optimizing the homologous arm length and the amount of dsDNA transformed, as well as eliminating codon bias, a dsDNA recombineering efficiency of 13,250 transformed colonies/109 viable cells was achieved, the highest efficiency currently reported in the literature. Using this optimized system, over 40,000 bp could be deleted in one transformation step. This recombineering strategy will greatly improve the speed of genetic modifications in C. glutamicum and assist other systems, such as clustered regularly interspaced short palindromic repeats and multiplexed automated genome engineering, in improving targeted genome editing.
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Affiliation(s)
- Cheng Li
- Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.,Disruptive & Sustainable Technologies for Agricultural Precision, Singapore-MIT Alliance for Research and Technology, Singapore, Singapore
| | - Charles A Swofford
- Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.,Disruptive & Sustainable Technologies for Agricultural Precision, Singapore-MIT Alliance for Research and Technology, Singapore, Singapore
| | - Christian Rückert
- Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.,Disruptive & Sustainable Technologies for Agricultural Precision, Singapore-MIT Alliance for Research and Technology, Singapore, Singapore
| | - Anthony J Sinskey
- Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.,Disruptive & Sustainable Technologies for Agricultural Precision, Singapore-MIT Alliance for Research and Technology, Singapore, Singapore
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Homing endonuclease I-SceI-mediated Corynebacterium glutamicum ATCC 13032 genome engineering. Appl Microbiol Biotechnol 2020; 104:3597-3609. [PMID: 32146493 DOI: 10.1007/s00253-020-10517-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 02/11/2020] [Accepted: 03/01/2020] [Indexed: 10/24/2022]
Abstract
Corynebacterium glutamicum is widely used to produce amino acids and is a chassis for the production of value-added compounds. Effective genome engineering methods are crucial to metabolic engineering and synthetic biology studies of C. glutamicum. Herein, a homing endonuclease I-SceI-mediated genome engineering strategy was established for the model strain C. glutamicum ATCC 13032. A vegetative R6K replicon-based, suicide plasmid was employed. The plasmid, pLS3661, contains both tightly regulated, IPTG (isopropyl-β-D-1-thiogalactopyranoside)-inducible I-SceI expression elements and two I-SceI recognition sites. Following cloning of the homologous arms into pLS3661 and transfer the recombinant vector into C. glutamicum ATCC 13032, through the homologous recombination between the cloned fragment and its chromosomal allele, a merodiploid was selected under kanamycin selection. Subsequently, a merodiploid was resolved by double-stranded break repair stimulated by IPTG-stimulated I-SceI expression, generating desired mutants. The protocol obviates a pre-generated strain, transfer of a second I-SceI expression plasmid, and there is not any strain, medium, and temperature restrictions. We validated the approach via deletions of five genes (up to ~ 13.0 kb) and knock-in of one DNA fragment. Furthermore, through kanamycin resistance repair, the ssDNA recombineering parameters were optimized. We hope the highly efficient method will be helpful for the studies of C. glutamicum, and potentially, to other bacteria. KEY POINTS: • Counterselection marker I-SceI-mediated C. glutamicum genome engineering • A suicide vector contains I-SceI expression elements and its recognition sites • Gene deletions and knock-in were conducted; efficiency was as high as 90% • Through antibiotic resistance repair, ssDNA recombineering parameters were optimized.
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5
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Wang J, Ma W, Wang Y, Lin L, Wang T, Wang Y, Li Y, Wang X. Deletion of 76 genes relevant to flagella and pili formation to facilitate polyhydroxyalkanoate production in Pseudomonas putida. Appl Microbiol Biotechnol 2018; 102:10523-10539. [PMID: 30338358 DOI: 10.1007/s00253-018-9439-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Revised: 10/03/2018] [Accepted: 10/04/2018] [Indexed: 10/28/2022]
Abstract
Pseudomonas putida KT2442, a natural producer of polyhydroxyalkanoate, spends a lot of energy and carbon sources to form flagella and pili; therefore, deleting the genes involved in the biosynthesis and assembly of flagella and pili might improve PHA productivity. In this study, two novel deletion systems were constructed in order to efficiently remove the 76 genes involved in the biosynthesis and assembly of flagella and pili in P. putida KT2442. Both systems combine suicide-plasmid-based homologous recombination and mutant lox site-specific recombination and involve three plasmids. The first includes pK18mobsacB, pWJW101, and pWJW102; and the second includes pZJD29c, pDTW202, and pWJW103. These newly constructed systems were successfully used to remove different gene clusters in P. putida KT2442 and showed a high deletion efficiency (above 90%) whether for the second-round or the third-round recombination. Both systems could efficiently delete the gene PP4378 encoding flagellin in putida KT2442, resulting in the mutant strain WJPP01. The second system was used to remove the pili-forming gene cluster PP2357-PP2363 in putida KT2442, resulting in the mutant strain WJPP02, and also used to remove the flagella-forming gene cluster PP4329-PP4397 in WJPP02, resulting in the mutant strain WJPP03. Compared with the wild-type KT2442, the 1.2% genome reduction mutant WJPP03 grew faster, lacked flagella and motility, showed sharply decreased biofilm and 3',5'-cyclic diguanylic acid (c-di-GMP), but accumulated more polyhydroxyalkanoate. The biomass, polyhydroxyalkanoate yield, and content of WJPP03 increased 19.1, 73.4, and 45.6%, respectively, with sodium hexanoate supplementation, and also increased 11.4, 53.6, and 37.9%, respectively, with lauric acid supplementation.
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Affiliation(s)
- Jianli Wang
- State Key Laboratory of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi, 214122, China.,International Joint Laboratory on Food Safety, Jiangnan University, Wuxi, 214122, China
| | - Wenjian Ma
- State Key Laboratory of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi, 214122, China.,International Joint Laboratory on Food Safety, Jiangnan University, Wuxi, 214122, China
| | - Yuzhou Wang
- State Key Laboratory of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi, 214122, China.,Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Lin Lin
- State Key Laboratory of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi, 214122, China
| | - Tianyi Wang
- State Key Laboratory of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi, 214122, China
| | - Yuqian Wang
- State Key Laboratory of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi, 214122, China.,Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Ye Li
- State Key Laboratory of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi, 214122, China
| | - Xiaoyuan Wang
- State Key Laboratory of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi, 214122, China. .,International Joint Laboratory on Food Safety, Jiangnan University, Wuxi, 214122, China. .,Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, China.
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6
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Lee JH, Wendisch VF. Production of amino acids - Genetic and metabolic engineering approaches. BIORESOURCE TECHNOLOGY 2017; 245:1575-1587. [PMID: 28552565 DOI: 10.1016/j.biortech.2017.05.065] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2017] [Revised: 05/10/2017] [Accepted: 05/11/2017] [Indexed: 05/22/2023]
Abstract
The biotechnological production of amino acids occurs at the million-ton scale and annually about 6milliontons of l-glutamate and l-lysine are produced by Escherichia coli and Corynebacterium glutamicum strains. l-glutamate and l-lysine production from starch hydrolysates and molasses is very efficient and access to alternative carbon sources and new products has been enabled by metabolic engineering. This review focusses on genetic and metabolic engineering of amino acid producing strains. In particular, rational approaches involving modulation of transcriptional regulators, regulons, and attenuators will be discussed. To address current limitations of metabolic engineering, this article gives insights on recent systems metabolic engineering approaches based on functional tools and method such as genome reduction, amino acid sensors based on transcriptional regulators and riboswitches, CRISPR interference, small regulatory RNAs, DNA scaffolding, and optogenetic control, and discusses future prospects.
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Affiliation(s)
- Jin-Ho Lee
- Major in Food Science & Biotechnology, School of Food Biotechnology & Nutrition, Kyungsung University, 309, Suyeong-ro, Nam-gu, Busan 48434, Republic of Korea
| | - Volker F Wendisch
- Genetics of Prokaryotes, Faculty of Biology and Center for Biotechnology, Bielefeld University, Bielefeld, Germany.
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7
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Zou X, Wang L, Li Z, Luo J, Wang Y, Deng Z, Du S, Chen S. Genome Engineering and Modification Toward Synthetic Biology for the Production of Antibiotics. Med Res Rev 2017; 38:229-260. [PMID: 28295439 DOI: 10.1002/med.21439] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Revised: 01/06/2017] [Accepted: 01/14/2017] [Indexed: 01/02/2023]
Affiliation(s)
- Xuan Zou
- Zhongnan Hospital, and Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences; Wuhan University; Wuhan Hubei 430071 China
- Taihe Hospital; Hubei University of Medicine; Shiyan Hubei China
| | - Lianrong Wang
- Zhongnan Hospital, and Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences; Wuhan University; Wuhan Hubei 430071 China
| | - Zhiqiang Li
- Zhongnan Hospital, and Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences; Wuhan University; Wuhan Hubei 430071 China
| | - Jie Luo
- Taihe Hospital; Hubei University of Medicine; Shiyan Hubei China
| | - Yunfu Wang
- Taihe Hospital; Hubei University of Medicine; Shiyan Hubei China
| | - Zixin Deng
- Zhongnan Hospital, and Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences; Wuhan University; Wuhan Hubei 430071 China
| | - Shiming Du
- Taihe Hospital; Hubei University of Medicine; Shiyan Hubei China
| | - Shi Chen
- Zhongnan Hospital, and Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences; Wuhan University; Wuhan Hubei 430071 China
- Taihe Hospital; Hubei University of Medicine; Shiyan Hubei China
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8
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Martínez-García E, de Lorenzo V. The quest for the minimal bacterial genome. Curr Opin Biotechnol 2016; 42:216-224. [DOI: 10.1016/j.copbio.2016.09.001] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2016] [Revised: 09/01/2016] [Accepted: 09/02/2016] [Indexed: 01/09/2023]
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9
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Construction of a minimal genome as a chassis for synthetic biology. Essays Biochem 2016; 60:337-346. [DOI: 10.1042/ebc20160024] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Revised: 09/26/2016] [Accepted: 09/29/2016] [Indexed: 12/15/2022]
Abstract
Microbial diversity and complexity pose challenges in understanding the voluminous genetic information produced from whole-genome sequences, bioinformatics and high-throughput ‘-omics’ research. These challenges can be overcome by a core blueprint of a genome drawn with a minimal gene set, which is essential for life. Systems biology and large-scale gene inactivation studies have estimated the number of essential genes to be ∼300–500 in many microbial genomes. On the basis of the essential gene set information, minimal-genome strains have been generated using sophisticated genome engineering techniques, such as genome reduction and chemical genome synthesis. Current size-reduced genomes are not perfect minimal genomes, but chemically synthesized genomes have just been constructed. Some minimal genomes provide various desirable functions for bioindustry, such as improved genome stability, increased transformation efficacy and improved production of biomaterials. The minimal genome as a chassis genome for synthetic biology can be used to construct custom-designed genomes for various practical and industrial applications.
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10
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Rivas-Marín E, Canosa I, Santero E, Devos DP. Development of Genetic Tools for the Manipulation of the Planctomycetes. Front Microbiol 2016; 7:914. [PMID: 27379046 PMCID: PMC4910669 DOI: 10.3389/fmicb.2016.00914] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Accepted: 05/27/2016] [Indexed: 01/03/2023] Open
Abstract
Bacteria belonging to the Planctomycetes, Verrucomicrobia, Chlamydiae (PVC) superphylum are of interest for biotechnology, evolutionary cell biology, ecology, and human health. Some PVC species lack a number of typical bacterial features while others possess characteristics that are usually more associated to eukaryotes or archaea. For example, the Planctomycetes phylum is atypical for the absence of the FtsZ protein and for the presence of a developed endomembrane system. Studies of the cellular and molecular biology of these infrequent characteristics are currently limited due to the lack of genetic tools for most of the species. So far, genetic manipulation in Planctomycetes has been described in Planctopirus limnophila only. Here, we show a simple approach that allows mutagenesis by homologous recombination in three different planctomycetes species (i.e., Gemmata obscuriglobus, Gimesia maris, and Blastopirellula marina), in addition to P. limnophila, thus extending the repertoire of genetically modifiable organisms in this superphylum. Although the Planctomycetes show high resistance to most antibiotics, we have used kanamycin resistance genes in G. obscuriglobus, P. limnophila, and G. maris, and tetracycline resistance genes in B. marina, as markers for mutant selection. In all cases, plasmids were introduced in the strains by mating or electroporation, and the genetic modification was verified by Southern Blotting analysis. In addition, we show that the green fluorescent protein (gfp) is expressed in all four backgrounds from an Escherichia coli promoter. The genetic manipulation achievement in four phylogenetically diverse planctomycetes will enable molecular studies in these strains, and opens the door to developing genetic approaches not only in other planctomycetes but also other species of the superphylum, such as the Lentisphaerae.
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Affiliation(s)
- Elena Rivas-Marín
- Laboratory of Evolutionary Innovations, Centro Andaluz de Biología del Desarrollo, Consejo Superior de Investigaciones Científicas, Universidad Pablo de OlavideSeville, Spain
| | - Inés Canosa
- Microbiology Area, Centro Andaluz de Biología del Desarrollo, Consejo Superior de Investigaciones Científicas, Universidad Pablo de OlavideSeville, Spain
| | - Eduardo Santero
- Microbiology Area, Centro Andaluz de Biología del Desarrollo, Consejo Superior de Investigaciones Científicas, Universidad Pablo de OlavideSeville, Spain
| | - Damien P. Devos
- Laboratory of Evolutionary Innovations, Centro Andaluz de Biología del Desarrollo, Consejo Superior de Investigaciones Científicas, Universidad Pablo de OlavideSeville, Spain
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Liu X, Yang Y, Zhang W, Sun Y, Peng F, Jeffrey L, Harvey L, McNeil B, Bai Z. Expression of recombinant protein using Corynebacterium Glutamicum: progress, challenges and applications. Crit Rev Biotechnol 2015; 36:652-64. [PMID: 25714007 DOI: 10.3109/07388551.2015.1004519] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Corynebacterium glutamicum (C. glutamicum) is a highly promising alternative prokaryotic host for recombinant protein expression, as it possesses several significant advantages over Escherichia coli (E. coli), the currently leading bacterial protein expression system. During the past decades, several experimental techniques and vector components for genetic manipulation of C. glutamicum have been developed and validated, including strong promoters for tightly regulating target gene expression, various types of plasmid vectors, protein secretion systems and methods of genetically modifying the host strain genome to improve protein production potential. This review critically discusses current progress in establishing C. glutamicum as a host for recombinant protein expression, and examines, in depth, some successful case studies of actual application of this expression system. The established "expression tool box" for developing novel constructs based on C. glutamicum as a host are also evaluated. Finally, the existing issues and solutions in process development with C. glutamicum as a host are specifically addressed.
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Affiliation(s)
- Xiuxia Liu
- a National Engineering Laboratory of Cereal Fermentation Technology , School of Biotechnology, JiangNan University , Wuxi , China and
| | - Yankun Yang
- a National Engineering Laboratory of Cereal Fermentation Technology , School of Biotechnology, JiangNan University , Wuxi , China and
| | - Wei Zhang
- a National Engineering Laboratory of Cereal Fermentation Technology , School of Biotechnology, JiangNan University , Wuxi , China and
| | - Yang Sun
- a National Engineering Laboratory of Cereal Fermentation Technology , School of Biotechnology, JiangNan University , Wuxi , China and
| | - Feng Peng
- a National Engineering Laboratory of Cereal Fermentation Technology , School of Biotechnology, JiangNan University , Wuxi , China and
| | - Laura Jeffrey
- b Institute of Pharmacy & Biomedical Sciences, Strathclyde University , Glasgow , UK
| | - Linda Harvey
- b Institute of Pharmacy & Biomedical Sciences, Strathclyde University , Glasgow , UK
| | - Brian McNeil
- b Institute of Pharmacy & Biomedical Sciences, Strathclyde University , Glasgow , UK
| | - Zhonghu Bai
- a National Engineering Laboratory of Cereal Fermentation Technology , School of Biotechnology, JiangNan University , Wuxi , China and
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12
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I-SceI-mediated scarless gene modification via allelic exchange in Clostridium. J Microbiol Methods 2015; 108:49-60. [DOI: 10.1016/j.mimet.2014.11.004] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Revised: 10/21/2014] [Accepted: 11/07/2014] [Indexed: 02/06/2023]
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13
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Jojima T, Noburyu R, Sasaki M, Tajima T, Suda M, Yukawa H, Inui M. Metabolic engineering for improved production of ethanol by Corynebacterium glutamicum. Appl Microbiol Biotechnol 2014; 99:1165-72. [DOI: 10.1007/s00253-014-6223-4] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Revised: 11/07/2014] [Accepted: 11/08/2014] [Indexed: 12/01/2022]
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14
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Development of a markerless gene replacement system in Corynebacterium glutamicum using upp as a counter-selection marker. Biotechnol Lett 2014; 37:609-17. [DOI: 10.1007/s10529-014-1718-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Accepted: 10/28/2014] [Indexed: 10/24/2022]
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15
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Song CW, Lee J, Lee SY. Genome engineering and gene expression control for bacterial strain development. Biotechnol J 2014; 10:56-68. [PMID: 25155412 DOI: 10.1002/biot.201400057] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Revised: 07/26/2014] [Accepted: 07/30/2014] [Indexed: 12/21/2022]
Abstract
In recent years, a number of techniques and tools have been developed for genome engineering and gene expression control to achieve desired phenotypes of various bacteria. Here we review and discuss the recent advances in bacterial genome manipulation and gene expression control techniques, and their actual uses with accompanying examples. Genome engineering has been commonly performed based on homologous recombination. During such genome manipulation, the counterselection systems employing SacB or nucleases have mainly been used for the efficient selection of desired engineered strains. The recombineering technology enables simple and more rapid manipulation of the bacterial genome. The group II intron-mediated genome engineering technology is another option for some bacteria that are difficult to be engineered by homologous recombination. Due to the increasing demands on high-throughput screening of bacterial strains having the desired phenotypes, several multiplex genome engineering techniques have recently been developed and validated in some bacteria. Another approach to achieve desired bacterial phenotypes is the repression of target gene expression without the modification of genome sequences. This can be performed by expressing antisense RNA, small regulatory RNA, or CRISPR RNA to repress target gene expression at the transcriptional or translational level. All of these techniques allow efficient and rapid development and screening of bacterial strains having desired phenotypes, and more advanced techniques are expected to be seen.
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Affiliation(s)
- Chan Woo Song
- Metabolic and Biomolecular Engineering National Research Laboratory, Department of Chemical and Biomolecular Engineering (BK21 plus program), Center for Systems and Synthetic Biotechnology, Institute for the BioCentury, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea; BioProcess Engineering Research Center, KAIST, Daejeon, Republic of Korea
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16
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Hu J, Tan Y, Li Y, Hu X, Xu D, Wang X. Construction and application of an efficient multiple-gene-deletion system in Corynebacterium glutamicum. Plasmid 2013; 70:303-13. [DOI: 10.1016/j.plasmid.2013.07.001] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2013] [Revised: 07/03/2013] [Accepted: 07/04/2013] [Indexed: 10/26/2022]
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17
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Kitade Y, Okino S, Gunji W, Hiraga K, Suda M, Suzuki N, Inui M, Yukawa H. Identification of a gene involved in plasmid structural instability in Corynebacterium glutamicum. Appl Microbiol Biotechnol 2013; 97:8219-26. [DOI: 10.1007/s00253-013-4934-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Revised: 04/16/2013] [Accepted: 04/16/2013] [Indexed: 01/21/2023]
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18
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Suzuki N, Inui M. Genome Engineering of Corynebacterium glutamicum. CORYNEBACTERIUM GLUTAMICUM 2013. [DOI: 10.1007/978-3-642-29857-8_3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
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19
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Site-specific recombination strategies for engineering actinomycete genomes. Appl Environ Microbiol 2012; 78:1804-12. [PMID: 22247163 DOI: 10.1128/aem.06054-11] [Citation(s) in RCA: 77] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
The feasibility of using technologies based on site-specific recombination in actinomycetes was shown several years ago. Despite their huge potential, these technologies mostly have been used for simple marker removal from a chromosome. In this paper, we present different site-specific recombination strategies for genome engineering in several actinomycetes belonging to the genera Streptomyces, Micromonospora, and Saccharothrix. Two different systems based on Cre/loxP and Dre/rox have been utilized for numerous applications. The activity of the Cre recombinase on the heterospecific loxLE and loxRE sites was similar to its activity on wild-type loxP sites. Moreover, an apramycin resistance marker flanked by the loxLERE sites was eliminated from the Streptomyces coelicolor M145 genome at a surprisingly high frequency (80%) compared to other bacteria. A synthetic gene encoding the Dre recombinase was constructed and successfully expressed in actinomycetes. We developed a marker-free expression method based on the combination of phage integration systems and site-specific recombinases. The Cre recombinase has been used in the deletion of huge genomic regions, including the phenalinolactone, monensin, and lipomycin biosynthetic gene clusters from Streptomyces sp. strain Tü6071, Streptomyces cinnamonensis A519, and Streptomyces aureofaciens Tü117, respectively. Finally, we also demonstrated the site-specific integration of plasmid and cosmid DNA into the chromosome of actinomycetes catalyzed by the Cre recombinase. We anticipate that the strategies presented here will be used extensively to study the genetics of actinomycetes.
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Tools for genetic manipulations in Corynebacterium glutamicum and their applications. Appl Microbiol Biotechnol 2011; 90:1641-54. [DOI: 10.1007/s00253-011-3272-9] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2011] [Revised: 03/21/2011] [Accepted: 03/23/2011] [Indexed: 01/26/2023]
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Silva G, Poirot L, Galetto R, Smith J, Montoya G, Duchateau P, Pâques F. Meganucleases and other tools for targeted genome engineering: perspectives and challenges for gene therapy. Curr Gene Ther 2011; 11:11-27. [PMID: 21182466 PMCID: PMC3267165 DOI: 10.2174/156652311794520111] [Citation(s) in RCA: 235] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2010] [Revised: 12/10/2010] [Accepted: 12/10/2010] [Indexed: 12/17/2022]
Abstract
The importance of safer approaches for gene therapy has been underscored by a series of severe adverse events (SAEs) observed in patients involved in clinical trials for Severe Combined Immune Deficiency Disease (SCID) and Chromic Granulomatous Disease (CGD). While a new generation of viral vectors is in the process of replacing the classical gamma-retrovirus-based approach, a number of strategies have emerged based on non-viral vectorization and/or targeted insertion aimed at achieving safer gene transfer. Currently, these methods display lower efficacies than viral transduction although many of them can yield more than 1% of engineered cells in vitro. Nuclease-based approaches, wherein an endonuclease is used to trigger site-specific genome editing, can significantly increase the percentage of targeted cells. These methods therefore provide a real alternative to classical gene transfer as well as gene editing. However, the first endonuclease to be in clinic today is not used for gene transfer, but to inactivate a gene (CCR5) required for HIV infection. Here, we review these alternative approaches, with a special emphasis on meganucleases, a family of naturally occurring rare-cutting endonucleases, and speculate on their current and future potential.
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Affiliation(s)
- George Silva
- Cellectis, 102 Avenue Gaston Roussel, 93 235 Romainville, Cedex, France
| | - Laurent Poirot
- Cellectis Genome Surgery, 102 Avenue Gaston Roussel, 93 235 Romainville, Cedex, France
| | - Roman Galetto
- Cellectis Genome Surgery, 102 Avenue Gaston Roussel, 93 235 Romainville, Cedex, France
| | - Julianne Smith
- Cellectis Genome Surgery, 102 Avenue Gaston Roussel, 93 235 Romainville, Cedex, France
| | - Guillermo Montoya
- Macromolecular Crystallography Group, Structural Biology and Biocomputing Programme, Spanish National Cancer Centre (CNIO), Melchor Fdez. Almagro 3, 28029 Madrid, Spain
| | | | - Frédéric Pâques
- Cellectis Genome Surgery, 102 Avenue Gaston Roussel, 93 235 Romainville, Cedex, France
- Cellectis, 102 Avenue Gaston Roussel, 93 235 Romainville, Cedex, France
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Synthetic biology: From the first synthetic cell to see its current situation and future development. ACTA ACUST UNITED AC 2011; 56:229-237. [PMID: 32214738 PMCID: PMC7088918 DOI: 10.1007/s11434-010-4304-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2010] [Accepted: 10/19/2010] [Indexed: 10/31/2022]
Abstract
Synthetic biology is an emerging field, which, since its birth, has shown great value and potential in many fields including medicine, energy, environment and agriculture. It is also important for the study of the origin and evolution of life. Since the publication of the first synthetic cell in May, 2010, synthetic biology again attracts high attention and leads to extensive discussions all over the world. There have been a number of researches and achievements on synthetic biology in the United States and European countries. While in China, so far there is no systematic research on synthetic biology. In order to promote the development of this new discipline in China, we organized this review to systematically introduce the concept and research content of synthetic biology, summarize the achievements, and investigate the current situation in both China and abroad. We also analyzed the opportunities and challenges in synthetic biology, and looked forward to the future development of synthetic biology, especially its future development in China.
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Marek M, van Oers MM, Devaraj FF, Vlak JM, Merten OW. Engineering of baculovirus vectors for the manufacture of virion-free biopharmaceuticals. Biotechnol Bioeng 2010; 108:1056-67. [PMID: 21449023 DOI: 10.1002/bit.23028] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2010] [Revised: 11/05/2010] [Accepted: 11/30/2010] [Indexed: 11/07/2022]
Abstract
A novel baculovirus-based protein expression strategy was developed to produce recombinant proteins in insect cells without contaminating baculovirus virions. This novel strategy greatly simplifies the downstream processing of biopharmaceuticals produced in insect cells. The formation of these virions is prevented by deletion of a baculovirus gene essential for virion formation. The deletion is trans-complemented in a transgenic insect cell line in which the baculovirus seed stock is produced. The Autographa californica multicapsid nucleopolyhedrovirus vp80 gene was selected for this purpose, as absence of VP80 prevented the formation of budded virus as well as occlusion-derived virus, while foreign gene expression was not affected. Sf9 insect cells were engineered to functionally complement the vp80 deletion in the expression vector virus during seed stock production. The trans-complemented vp80-deletion baculovirus seed produced an amount of recombinant protein similar to that produced with conventional baculovirus vectors but without contaminating virions. This novel expression method obviates the need to purify the virions away from the biopharmaceuticals.
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Affiliation(s)
- Martin Marek
- Laboratory of Virology, Wageningen University, Wageningen, The Netherlands
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Lu Z, Xie P, Qin Z. Promotion of markerless deletion of the actinorhodin biosynthetic gene cluster in Streptomyces coelicolor. Acta Biochim Biophys Sin (Shanghai) 2010; 42:717-21. [PMID: 20810535 DOI: 10.1093/abbs/gmq080] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The standard gene disruption and replacement to delete the actinorhodin biosynthetic gene cluster (Act) in Streptomyces coelicolor was inefficient, and the polymerase chain reaction-targeting of the cosmid could efficiently delete the Act, but still was a time-consuming procedure for markerless gene replacement. By using optimal Streptomyces codons, we synthesized a sceS gene encoding identical amino acid sequence as the chromosome rare-cutting meganuclease I-sce I of the Saccharomyces cerevisiae mitochondria. Expression of sceS gene in S. coelicolor resulted in promotion of homologous recombination and subsequently, successful achieved markerless deletion of the Act. The sceS system may be useful for the sequential markerless deletions of chromosomal segments in Streptomyces.
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Affiliation(s)
- Zhiqun Lu
- Shanghai Institute of Plant Physiology and Ecology, The Chinese Academy of Sciences, China
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I-SceI endonuclease: a new tool for DNA repair studies and genetic manipulations in streptomycetes. Appl Microbiol Biotechnol 2010; 87:1525-32. [DOI: 10.1007/s00253-010-2643-y] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2010] [Revised: 04/21/2010] [Accepted: 04/21/2010] [Indexed: 11/28/2022]
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Zhang LY, Chang SH, Wang J. How to make a minimal genome for synthetic minimal cell. Protein Cell 2010; 1:427-34. [PMID: 21203957 PMCID: PMC4875141 DOI: 10.1007/s13238-010-0064-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2010] [Accepted: 05/12/2010] [Indexed: 01/19/2023] Open
Abstract
As a key focus of synthetic biology, building a minimal artificial cell has given rise to many discussions. A synthetic minimal cell will provide an appropriate chassis to integrate functional synthetic parts, devices and systems with functions that cannot generally be found in nature. The design and construction of a functional minimal genome is a key step while building such a cell/chassis since all the cell functions can be traced back to the genome. Kinds of approaches, based on bioinformatics and molecular biology, have been developed and proceeded to derive essential genes and minimal gene sets for the synthetic minimal genome. Experiments about streamlining genomes of model bacteria revealed genome reduction led to unanticipated beneficial properties, such as high electroporation efficiency and accurate propagation of recombinant genes and plasmids that were unstable in other strains. Recent achievements in chemical synthesis technology for large DNA segments together with the rapid development of the whole-genome sequencing, have transferred synthesis of genes to assembly of the whole genomes based on oligonucleotides, and thus created strong preconditions for synthesis of artificial minimal genome. Here in this article, we review briefly the history and current state of research in this field and summarize the main methods for making a minimal genome. We also discuss the impacts of minimized genome on metabolism and regulation of artificial cell.
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Affiliation(s)
- Liu-yan Zhang
- Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing, 100101 China
| | - Su-hua Chang
- Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing, 100101 China
| | - Jing Wang
- Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing, 100101 China
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Cre-lox-based method for generation of large deletions within the genomic magnetosome island of Magnetospirillum gryphiswaldense. Appl Environ Microbiol 2010; 76:2439-44. [PMID: 20173068 DOI: 10.1128/aem.02805-09] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Magnetosome biomineralization and magnetotaxis in magnetotactic bacteria are controlled by numerous, mostly unknown gene functions that are predominantly encoded by several operons located within the genomic magnetosome island (MAI). Genetic analysis of magnetotactic bacteria has remained difficult and requires the development of novel tools. We established a Cre-lox-based deletion method which allows the excision of large genomic fragments in Magnetospirillum gryphiswaldense. Two conjugative suicide plasmids harboring lox sites that flanked the target region were subsequently inserted into the chromosome by homologous recombination, requiring only one single-crossover event, respectively, and resulting in a double cointegrate. Excision of the targeted chromosomal segment that included the inserted plasmids and their resistance markers was induced by trans expression of Cre recombinase, which leaves behind a scar of only a single loxP site. The Cre helper plasmid was then cured from the deletant strain by relief of antibiotic selection. We have used this method for the deletion of 16.3-kb, 61-kb, and 67.3-kb fragments from the genomic MAI, either in a single round or in subsequent rounds of deletion, covering a region of approximately 87 kb that comprises the mamAB, mms6, and mamGFDC operons. As expected, all mutants were Mag(-) and some were Mot(-); otherwise, they showed normal growth patterns, which indicates that the deleted region is not essential for viability in the laboratory. The method will facilitate future functional analysis of magnetosome genes and also can be utilized for large-scale genome engineering in magnetotactic bacteria.
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Versatile dual-technology system for markerless allele replacement in Burkholderia pseudomallei. Appl Environ Microbiol 2009; 75:6496-503. [PMID: 19700544 DOI: 10.1128/aem.01669-09] [Citation(s) in RCA: 131] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Burkholderia pseudomallei is the etiologic agent of melioidosis, a rare but serious tropical disease. In the United States, genetic research with this select agent bacterium is strictly regulated. Although several select agent compliant methods have been developed for allelic replacement, all of them suffer from some drawbacks, such as a need for specific host backgrounds or use of minimal media. Here we describe a versatile select agent compliant allele replacement system for B. pseudomallei based on a mobilizable vector, pEXKm5, which contains (i) a multiple cloning site within a lacZalpha gene for facile cloning of recombinant DNA fragments, (ii) a constitutively expressed gusA indicator gene for visual detection of merodiploid formation and resolution, and (iii) elements required for resolution of merodiploids using either I-SceI homing endonuclease-stimulated recombination or sacB-based counterselection. The homing endonuclease-based allele replacement system is completed by pBADSce, which contains an araC-P(BAD)-I-sceI expression cassette for arabinose-inducible I-SceI expression and a temperature-sensitive pRO1600 replicon for facile plasmid curing. Complementing these systems is the improved Deltaasd Escherichia coli mobilizer strain RHO3. This strain is susceptible to commonly used antibiotics and allows nutritional counterselection on rich media because of its diaminopimelic acid auxotrophy. The versatility of the I-SceI- and sacB-based methods afforded by pEXKm5 in conjunction with E. coli RHO3 was demonstrated by isolation of diverse deletion mutants in several clinical, environmental, and laboratory B. pseudomallei strains. Finally, sacB-based counterselection was employed to isolate a defined chromosomal fabD(Ts) allele that causes synthesis of a temperature-sensitive FabD, an essential fatty acid biosynthesis enzyme.
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Moya A, Gil R, Latorre A, Peretó J, Pilar Garcillán-Barcia M, de la Cruz F. Toward minimal bacterial cells: evolution vs. design. FEMS Microbiol Rev 2009; 33:225-35. [PMID: 19067748 PMCID: PMC7189813 DOI: 10.1111/j.1574-6976.2008.00151.x] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2008] [Revised: 09/29/2008] [Accepted: 10/24/2008] [Indexed: 02/05/2023] Open
Abstract
Recent technical and conceptual advances in the biological sciences opened the possibility of the construction of newly designed cells. In this paper we review the state of the art of cell engineering in the context of genome research, paying particular attention to what we can learn on naturally reduced genomes from either symbiotic or free living bacteria. Different minimal hypothetically viable cells can be defined on the basis of several computational and experimental approaches. Projects aiming at simplifying living cells converge with efforts to make synthetic genomes for minimal cells. The panorama of this particular view of synthetic biology lead us to consider the use of defined minimal cells to be applied in biomedical, bioremediation, or bioenergy application by taking advantage of existing naturally minimized cells.
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Affiliation(s)
- Andrés Moya
- Institut Cavanilles de Biodiversitat i Biologia Evolutiva, Universitat de València, València, Spain.
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Flannagan RS, Linn T, Valvano MA. A system for the construction of targeted unmarked gene deletions in the genus Burkholderia. Environ Microbiol 2008; 10:1652-60. [PMID: 18341581 DOI: 10.1111/j.1462-2920.2008.01576.x] [Citation(s) in RCA: 118] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Burkholderia species are extremely multidrug resistant, environmental bacteria with extraordinary bioremediation and biocontrol properties. At the same time, these bacteria cause serious opportunistic infections in vulnerable patient populations while some species can potentially be used as bioweapons. The complete DNA sequence of more than 10 Burkholderia genomes provides an opportunity to apply functional genomics to a collection of widely adaptable environmental bacteria thriving in diverse niches and establishing both symbiotic and pathogenic associations with many different organisms. However, extreme multidrug resistance hampers genetic manipulations in Burkholderia. We have developed and evaluated a mutagenesis system based on the homing endonuclease I-SceI to construct targeted, non-polar unmarked gene deletions in Burkholderia. Using the cystic fibrosis pathogen Burkholderia cenocepacia K56-2 as a model strain, we demonstrate this system allows for clean deletions of one or more genes within an operon and also the introduction of multiple deletions in the same strain. We anticipate this tool will have widespread environmental and biomedical applications, facilitating functional genomic studies and construction of safe strains for bioremediation and biocontrol, as well as clinical applications such as live vaccines for Burkholderia and other Gram-negative bacterial species.
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Affiliation(s)
- Ronald S Flannagan
- Infectious Diseases Research Group, Department of Microbiology and Immunology, University of Western Ontario, London, Ontario, Canada
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Fehér T, Papp B, Pal C, Pósfai G. Systematic genome reductions: theoretical and experimental approaches. Chem Rev 2007; 107:3498-513. [PMID: 17636890 DOI: 10.1021/cr0683111] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tamas Fehér
- Institute of Biochemistry, Biological Research Center of the Hungarian Academy of Sciences, Szeged, Hungary
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Tsuge Y, Suzuki N, Inui M, Yukawa H. Random segment deletion based on IS31831 and Cre/loxP excision system in Corynebacterium glutamicum. Appl Microbiol Biotechnol 2007; 74:1333-41. [PMID: 17221197 DOI: 10.1007/s00253-006-0788-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2006] [Revised: 11/28/2006] [Accepted: 11/30/2006] [Indexed: 10/23/2022]
Abstract
A simple and random genome deletion method combining insertion sequence (IS) element IS31831 and the Cre/loxP excision system generated 42 Corynebacterium glutamicum mutants (0.2-186 kb). A total of 393.6 kb (11.9% of C. glutamicum R genome) coding for 331 genes was confirmed to be nonessential under standard laboratory conditions. The deletion strains, generated using only two vectors, varied not only in their lengths but also the location of the deletion along the C. glutamicum R genome. By comparing and analyzing the generated deletion strains, identification of nonessential genes, the roles of genes of hitherto unknown function, and gene-gene interactions can be easily and efficiently determined.
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Affiliation(s)
- Yota Tsuge
- Research Institute of Innovative Technology for the Earth (RITE), 9-2 Kizugawadai, Soraku-gun, Kyoto 619-0292, Japan
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Vertès AA, Inui M, Yukawa H. Manipulating corynebacteria, from individual genes to chromosomes. Appl Environ Microbiol 2006; 71:7633-42. [PMID: 16332735 PMCID: PMC1317429 DOI: 10.1128/aem.71.12.7633-7642.2005] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Alain A Vertès
- Research Institute of Innovative Technology for the Earth, 9-2 Kizugawadai, Kizu, Soraku, Kyoto 619-0292, Japan
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Suzuki N, Nonaka H, Tsuge Y, Inui M, Yukawa H. New multiple-deletion method for the Corynebacterium glutamicum genome, using a mutant lox sequence. Appl Environ Microbiol 2006; 71:8472-80. [PMID: 16332837 PMCID: PMC1317446 DOI: 10.1128/aem.71.12.8472-8480.2005] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Due to the difficulty of multiple deletions using the Cre/loxP system, a simple, markerless multiple-deletion method based on a Cre/mutant lox system combining a right-element (RE) mutant lox site with a left-element (LE) mutant lox site was employed for large-scale genome rearrangements in Corynebacterium glutamicum. Eight distinct genomic regions that had been identified previously by comparative analysis of C. glutamicum R and C. glutamicum 13032 genomes were targeted for deletion. By homologous recombination, LE and RE mutant lox sites were integrated at each end of a target region. Highly efficient and accurate deletions between the two chromosomal mutant lox sites in the presence of Cre recombinase were realized. A deletion mutant lacking 190 kb of chromosomal regions, encoding a total of 188 open reading frames (ORFs), was obtained. These deletions represent the largest genomic excisions in C. glutamicum reported to date. Despite the loss of numerous predicted ORFs, the mutant exhibited normal growth under standard laboratory conditions. The Cre/loxP system using a pair of mutant lox sites provides a new, efficient genome rearrangement technique for C. glutamicum. It should facilitate the understanding of genome functions of microorganisms.
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Affiliation(s)
- Nobuaki Suzuki
- Microbiology Research Group, Research Institute of Innovative Technology for the Earth (RITE), 9-2, Kizugawadai, Kizu-Cho, Soraku-Gun, Kyoto 619-0292, Japan
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