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Deng YD, Zhang WH, Zuo ZH, Zhang H, Xu J, Gao JJ, Wang B, Li ZJ, Fu XY, Wang LJ, Wang Y, Tian YS, Peng RH, Yao QH. The complete degradation of 1,2-dichloroethane in Escherichia coli by metabolic engineering. JOURNAL OF HAZARDOUS MATERIALS 2024; 472:134476. [PMID: 38691996 DOI: 10.1016/j.jhazmat.2024.134476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Revised: 04/01/2024] [Accepted: 04/27/2024] [Indexed: 05/03/2024]
Abstract
1,2-Dichloroethane (1,2-DCA), a widely utilized chemical intermediate and organic solvent in industry, frequently enters the environment due to accidental leaks and mishandling during application processes. Thus, the in-situ remediation of contaminated sites has become increasingly urgent. However, traditional remediation methods are inefficient and costly, while bioremediation presents a green, efficient, and non-secondary polluting alternative. In this study, an engineered strain capable of completely degrading 1,2-DCA was constructed. We introduced six exogenous genes of the 1,2-DCA degradation pathway into E. coli and confirmed their normal transcription and efficient expression in this engineered strain through qRT-PCR and proteomics. The degradation experiments showed that the strain completely degraded 2 mM 1,2-DCA within 12 h. Furthermore, the results of isotope tracing verified that the final degradation product, malic acid, entered the tricarboxylic acid cycle (TCA) of E. coli and was ultimately fully metabolized. Also, morphological changes in the engineered strain and control strain exposed to 1,2-DCA were observed under SEM, and the results revealed that the engineered strain is more tolerant to 1,2-DCA than the control strain. In conclusion, this study paved a new way for humanity to deal with the increasingly complex environmental challenges.
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Affiliation(s)
- Yong-Dong Deng
- Biotechnology Research Institute of Shanghai Academy of Agricultural Sciences, Shanghai Key Laboratory of Agricultural Genetics and Breeding, Shanghai 201106, China; Key Laboratory for Safety Assessment (Enviornment) of Agricultural Genetically Modified Organisms, Ministry of Agriculture and Rural Affairs, P.R. China
| | - Wen-Hui Zhang
- Biotechnology Research Institute of Shanghai Academy of Agricultural Sciences, Shanghai Key Laboratory of Agricultural Genetics and Breeding, Shanghai 201106, China; Key Laboratory for Safety Assessment (Enviornment) of Agricultural Genetically Modified Organisms, Ministry of Agriculture and Rural Affairs, P.R. China
| | - Zhi-Hao Zuo
- Biotechnology Research Institute of Shanghai Academy of Agricultural Sciences, Shanghai Key Laboratory of Agricultural Genetics and Breeding, Shanghai 201106, China; Key Laboratory for Safety Assessment (Enviornment) of Agricultural Genetically Modified Organisms, Ministry of Agriculture and Rural Affairs, P.R. China
| | - Hao Zhang
- Biotechnology Research Institute of Shanghai Academy of Agricultural Sciences, Shanghai Key Laboratory of Agricultural Genetics and Breeding, Shanghai 201106, China; Key Laboratory for Safety Assessment (Enviornment) of Agricultural Genetically Modified Organisms, Ministry of Agriculture and Rural Affairs, P.R. China
| | - Jing Xu
- Biotechnology Research Institute of Shanghai Academy of Agricultural Sciences, Shanghai Key Laboratory of Agricultural Genetics and Breeding, Shanghai 201106, China; Key Laboratory for Safety Assessment (Enviornment) of Agricultural Genetically Modified Organisms, Ministry of Agriculture and Rural Affairs, P.R. China
| | - Jian-Jie Gao
- Biotechnology Research Institute of Shanghai Academy of Agricultural Sciences, Shanghai Key Laboratory of Agricultural Genetics and Breeding, Shanghai 201106, China; Key Laboratory for Safety Assessment (Enviornment) of Agricultural Genetically Modified Organisms, Ministry of Agriculture and Rural Affairs, P.R. China
| | - Bo Wang
- Biotechnology Research Institute of Shanghai Academy of Agricultural Sciences, Shanghai Key Laboratory of Agricultural Genetics and Breeding, Shanghai 201106, China; Key Laboratory for Safety Assessment (Enviornment) of Agricultural Genetically Modified Organisms, Ministry of Agriculture and Rural Affairs, P.R. China
| | - Zhen-Jun Li
- Biotechnology Research Institute of Shanghai Academy of Agricultural Sciences, Shanghai Key Laboratory of Agricultural Genetics and Breeding, Shanghai 201106, China; Key Laboratory for Safety Assessment (Enviornment) of Agricultural Genetically Modified Organisms, Ministry of Agriculture and Rural Affairs, P.R. China
| | - Xiao-Yan Fu
- Biotechnology Research Institute of Shanghai Academy of Agricultural Sciences, Shanghai Key Laboratory of Agricultural Genetics and Breeding, Shanghai 201106, China; Key Laboratory for Safety Assessment (Enviornment) of Agricultural Genetically Modified Organisms, Ministry of Agriculture and Rural Affairs, P.R. China
| | - Li-Juan Wang
- Biotechnology Research Institute of Shanghai Academy of Agricultural Sciences, Shanghai Key Laboratory of Agricultural Genetics and Breeding, Shanghai 201106, China; Key Laboratory for Safety Assessment (Enviornment) of Agricultural Genetically Modified Organisms, Ministry of Agriculture and Rural Affairs, P.R. China
| | - Yu Wang
- Biotechnology Research Institute of Shanghai Academy of Agricultural Sciences, Shanghai Key Laboratory of Agricultural Genetics and Breeding, Shanghai 201106, China; Key Laboratory for Safety Assessment (Enviornment) of Agricultural Genetically Modified Organisms, Ministry of Agriculture and Rural Affairs, P.R. China
| | - Yong-Sheng Tian
- Biotechnology Research Institute of Shanghai Academy of Agricultural Sciences, Shanghai Key Laboratory of Agricultural Genetics and Breeding, Shanghai 201106, China; Key Laboratory for Safety Assessment (Enviornment) of Agricultural Genetically Modified Organisms, Ministry of Agriculture and Rural Affairs, P.R. China.
| | - Ri-He Peng
- Biotechnology Research Institute of Shanghai Academy of Agricultural Sciences, Shanghai Key Laboratory of Agricultural Genetics and Breeding, Shanghai 201106, China; Key Laboratory for Safety Assessment (Enviornment) of Agricultural Genetically Modified Organisms, Ministry of Agriculture and Rural Affairs, P.R. China.
| | - Quan-Hong Yao
- Biotechnology Research Institute of Shanghai Academy of Agricultural Sciences, Shanghai Key Laboratory of Agricultural Genetics and Breeding, Shanghai 201106, China; Key Laboratory for Safety Assessment (Enviornment) of Agricultural Genetically Modified Organisms, Ministry of Agriculture and Rural Affairs, P.R. China.
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Jiang J, Zhao Y, Chen A, Sun J, Zhou M, Hu J, Cao X, Dai N, Liang Z, Feng S. Efficient markerless genetic manipulation of Pasteurella multocida using lacZ and pheSm as selection markers. Appl Environ Microbiol 2024; 90:e0204323. [PMID: 38547470 PMCID: PMC11022533 DOI: 10.1128/aem.02043-23] [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: 11/14/2023] [Accepted: 03/07/2024] [Indexed: 04/18/2024] Open
Abstract
Pasteurella multocida is a zoonotic conditional pathogen that infects multiple livestock species, causing substantial economic losses in the animal husbandry industry. An efficient markerless method for gene manipulation may facilitate the investigations of P. multocida gene function and pathogenesis of P. multocida. Herein, a temperature-sensitive shuttle vector was constructed using lacZ as a selection marker, and markerless glgB, opa, and hyaE mutants of P. multocida were subsequently constructed through blue-white colony screening. The screening efficiency of markerless deletion strains was improved by the lacZ system, and the method could be used for multiple gene deletions. However, the fur mutant was unavailable via this method. Therefore, we constructed a pheSm screening system based on mutated phenylalanine tRNA synthetase as a counterselection marker to achieve fur deletion mutant. The transformed strain was sensitive to 20 mM p-chloro-phenylalanine, demonstrating the feasibility of pheSm as a counter-selective marker. The pheSm system was used for markerless deletions of glgB, opa, and hyaE as well as fur that could not be screened by the lacZ system. A comparison of screening efficiencies of the system showed that the pheSm counterselection system was more efficient than the lacZ system and broadly applicable for mutant screening. The methods developed herein may provide valuable tools for genetic manipulation of P. multocida.IMPORTANCEPasteurella multocida is a highly contagious zoonotic pathogen. An understanding of its underlying pathogenic mechanisms is of considerable importance and requires efficient species-specific genetic tools. Herein, we propose a screening system for P. multocida mutants using lacZ or pheSm screening markers. We evaluated the efficiencies of both systems, which were used to achieve markerless deletion of multiple genes. The results of this study support the use of lacZ or pheSm as counterselection markers to improve counterselection efficiency in P. multocida. This study provides an effective genetic tool for investigations of the virulence gene functions and pathogenic mechanisms of P. multocida.
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Affiliation(s)
- Jinfei Jiang
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Yishan Zhao
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Aihua Chen
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Juan Sun
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Mengruo Zhou
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Jialian Hu
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Xuewei Cao
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Ning Dai
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Zhaoping Liang
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
- Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, Guangzhou, China
- Key Laboratory of Zoonosis of Ministry of Agriculture and Rural Affairs, Guangzhou, China
- Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture and Rural Affairs, Guangzhou, China
- National and Regional Joint Engineering Laboratory for Medicament of Zoonosis Prevention and Control, Guangzhou, China
| | - Saixiang Feng
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
- Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, Guangzhou, China
- Key Laboratory of Zoonosis of Ministry of Agriculture and Rural Affairs, Guangzhou, China
- Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture and Rural Affairs, Guangzhou, China
- National and Regional Joint Engineering Laboratory for Medicament of Zoonosis Prevention and Control, Guangzhou, China
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Wang Y, Tian YS, Gao JJ, Xu J, Li ZJ, Fu XY, Han HJ, Wang LJ, Zhang WH, Deng YD, Qian C, Zuo ZH, Wang B, Peng RH, Yao QH. Complete biodegradation of the oldest organic herbicide 2,4-Dichlorophenoxyacetic acid by engineering Escherichia coli. JOURNAL OF HAZARDOUS MATERIALS 2023; 451:131099. [PMID: 36868133 DOI: 10.1016/j.jhazmat.2023.131099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2022] [Revised: 02/23/2023] [Accepted: 02/25/2023] [Indexed: 06/18/2023]
Abstract
After nearly 80 years of extensive application, the oldest organic herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) has caused many problems of environmental pollution and ecological deterioration. Bioremediation is an ideal method for pollutant treatment. However, difficult screening and preparation of efficient degradation bacteria have largely hindered its application in 2,4-D remediation. We have created a novel engineering Escherichia coli with a reconstructed complete degradation pathway of 2,4-D to solve the problem of screening highly efficient degradation bacteria in this study. The results of fluorescence quantitative PCR demonstrated that all nine genes in the degradation pathway were successfully expressed in the engineered strain. The engineered strains can quickly and completely degrade 0.5 mM 2, 4-D within 6 h. Inspiring, the engineered strains grew with 2,4-D as the sole carbon source. By using the isotope tracing method, the metabolites of 2,4-D were found incorporated into the tricarboxylic acid cycle in the engineering strain. Scanning electron microscopy showed that 2,4-D had less damage on the engineered bacteria than the wild-type strain. Engineered strain can also rapidly and completely remedy 2,4-D pollution in natural water and soil. Assembling the metabolic pathways of pollutants through synthetic biology was an effective method to create pollutant-degrading bacteria for bioremediation.
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Affiliation(s)
- Yu Wang
- Shanghai Key laboratory of Agricultural Genetics and Breeding, Biotechnology Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - Yong-Sheng Tian
- Shanghai Key laboratory of Agricultural Genetics and Breeding, Biotechnology Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - Jian-Jie Gao
- Shanghai Key laboratory of Agricultural Genetics and Breeding, Biotechnology Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - Jing Xu
- Shanghai Key laboratory of Agricultural Genetics and Breeding, Biotechnology Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - Zhen-Jun Li
- Shanghai Key laboratory of Agricultural Genetics and Breeding, Biotechnology Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - Xiao-Yan Fu
- Shanghai Key laboratory of Agricultural Genetics and Breeding, Biotechnology Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - Hong-Juan Han
- Shanghai Key laboratory of Agricultural Genetics and Breeding, Biotechnology Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - Li-Juan Wang
- Shanghai Key laboratory of Agricultural Genetics and Breeding, Biotechnology Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - Wen-Hui Zhang
- Shanghai Key laboratory of Agricultural Genetics and Breeding, Biotechnology Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - Yong-Dong Deng
- Shanghai Key laboratory of Agricultural Genetics and Breeding, Biotechnology Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - Cen Qian
- Shanghai Key laboratory of Agricultural Genetics and Breeding, Biotechnology Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - Zhi-Hao Zuo
- Shanghai Key laboratory of Agricultural Genetics and Breeding, Biotechnology Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - Bo Wang
- Shanghai Key laboratory of Agricultural Genetics and Breeding, Biotechnology Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai, China.
| | - Ri-He Peng
- Shanghai Key laboratory of Agricultural Genetics and Breeding, Biotechnology Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai, China.
| | - Quan-Hong Yao
- Shanghai Key laboratory of Agricultural Genetics and Breeding, Biotechnology Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai, China.
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4
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Anand U, Dey S, Bontempi E, Ducoli S, Vethaak AD, Dey A, Federici S. Biotechnological methods to remove microplastics: a review. ENVIRONMENTAL CHEMISTRY LETTERS 2023; 21:1787-1810. [PMID: 36785620 PMCID: PMC9907217 DOI: 10.1007/s10311-022-01552-4] [Citation(s) in RCA: 25] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Accepted: 11/25/2022] [Indexed: 05/14/2023]
Abstract
Microplastics pollution is major threat to ecosystems and is impacting abiotic and biotic components. Microplastics are diverse and highly complex contaminants that transport other contaminants and microbes. Current methods to remove microplastics include biodegradation, incineration, landfilling, and recycling. Here we review microplastics with focus on sources, toxicity, and biodegradation. We discuss the role of algae, fungi, bacteria in the biodegradation, and we present biotechnological methods to enhance degradation, e.g., gene editing tools and bioinformatics.
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Affiliation(s)
- Uttpal Anand
- Zuckerberg Institute for Water Research, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, 8499000 Midreshet Ben Gurion, Israel
| | - Satarupa Dey
- Department of Botany, Shyampur Siddheswari Mahavidyalaya, University of Calcutta, Ajodhya, Shyampur, Howrah, 711312 India
| | - Elza Bontempi
- Department of Mechanical and Industrial Engineering, INSTM Unit of Brescia, University of Brescia, Via Branze 38, 25123 Brescia, Italy
| | - Serena Ducoli
- Department of Mechanical and Industrial Engineering, INSTM Unit of Brescia, University of Brescia, Via Branze 38, 25123 Brescia, Italy
| | - A. Dick Vethaak
- Department of Environment and Health, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
- Institute for Risk Assessment Sciences, Department of Population Health Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, Netherlands
| | - Abhijit Dey
- Department of Life Sciences, Presidency University, 86/1 College Street, Kolkata, West Bengal 700073 India
| | - Stefania Federici
- Department of Mechanical and Industrial Engineering, INSTM Unit of Brescia, University of Brescia, Via Branze 38, 25123 Brescia, Italy
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5
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Jones RA, Yee WX, Mader K, Tang CM, Cehovin A. Markerless gene editing in Neisseria gonorrhoeae. MICROBIOLOGY (READING, ENGLAND) 2022; 168. [PMID: 35763318 DOI: 10.1099/mic.0.001201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Neisseria gonorrhoeae, the gonococcus, is a pathogen of major public health concern, but sophisticated approaches to gene manipulation are limited for this species. For example, there are few methods for generating markerless mutations, which allow the generation of precise point mutations and deletions without introducing additional DNA sequence. Markerless mutations are central to studying pathogenesis, the spread of antimicrobial resistance (AMR) and for vaccine development. Here we describe the use of galK as a counter-selectable marker that can be used for markerless mutagenesis in N. gonorrhoeae. galK encodes galactokinase, an enzyme that metabolizes galactose in bacteria that can utilize it as a sole carbon source. GalK can also phosphorylate a galactose analogue, 2-deoxy-galactose (2-DOG), into a toxic, non-metabolisable intermediate, 2-deoxy-galactose-1-phosphate. We utilized this property of GalK to develop a markerless approach for mutagenesis in N. gonorrhoeae. We successfully deleted both chromosomally and plasmid-encoded genes, that are important for gonococcal vaccine development and studies of AMR spread. We designed a positive-negative selection cassette, based on an antibiotic resistance marker and galK, that efficiently rendered N. gonorrhoeae susceptible to growth on 2-DOG. We then adapted the galK-based counter-selection and the use of 2-DOG for markerless mutagenesis, and applied biochemical and phenotypic analyses to confirm the absence of target genes. We show that our markerless mutagenesis method for N. gonorrhoeae has a high success rate, and should be a valuable gene editing tool in the future.
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Affiliation(s)
- Rebekah A Jones
- Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford, UK
| | - Wearn Xin Yee
- Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford, UK
| | - Kahlio Mader
- Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford, UK
| | - Christoph M Tang
- Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford, UK
| | - Ana Cehovin
- Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford, UK
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6
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Tran KM, Lee HM, Thai TD, Shen J, Eyun SI, Na D. Synthetically engineered microbial scavengers for enhanced bioremediation. JOURNAL OF HAZARDOUS MATERIALS 2021; 419:126516. [PMID: 34218189 DOI: 10.1016/j.jhazmat.2021.126516] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2021] [Revised: 06/21/2021] [Accepted: 06/24/2021] [Indexed: 06/13/2023]
Abstract
Microbial bioremediation has gained attention as a cheap, efficient, and sustainable technology to manage the increasing environmental pollution. Since microorganisms in nature are not evolved to degrade pollutants, there is an increasing demand for developing safer and more efficient pollutant-scavengers for enhanced bioremediation. In this review, we introduce the strategies and technologies developed in the field of synthetic biology and their applications to the construction of microbial scavengers with improved efficiency of biodegradation while minimizing the impact of genetically engineered microbial scavengers on ecosystems. In addition, we discuss recent achievements in the biodegradation of fastidious pollutants, greenhouse gases, and microplastics using engineered microbial scavengers. Using synthetic microbial scavengers and multidisciplinary technologies, toxic pollutants could be more easily eliminated, and the environment could be more efficiently recovered.
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Affiliation(s)
- Kha Mong Tran
- Department of Biomedical Engineering, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Hyang-Mi Lee
- Department of Biomedical Engineering, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Thi Duc Thai
- Department of Biomedical Engineering, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Junhao Shen
- Department of Biomedical Engineering, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Seong-Il Eyun
- Department of Life Science, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Dokyun Na
- Department of Biomedical Engineering, Chung-Ang University, Seoul 06974, Republic of Korea.
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7
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Ji X, Lu P, Hu Y, Xue J, Wu J, Zhang B, Zhang Y, Dong L, Lv H, Wang S. Function Characterization of Endogenous Plasmids in Cronobacter sakazakii and Identification of p-Coumaric Acid as Plasmid-Curing Agent. Front Microbiol 2021; 12:687243. [PMID: 34248908 PMCID: PMC8267800 DOI: 10.3389/fmicb.2021.687243] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 05/25/2021] [Indexed: 11/13/2022] Open
Abstract
Virulence traits and antibiotic resistance are frequently provided by genes located on plasmids. However, experimental verification of the functions of these genes is often lacking due to a lack of related experimental technology. In the present study, an integrated suicide vector was used to efficiently and specifically delete a bacterial endogenous plasmid in Cronobacter sakazakii. The pESA3 plasmid was removed from C. sakazakii BAA-894, and we confirmed that this plasmid contributes to the invasion and virulence of this strain. In addition, the pGW1 plasmid was expunged from C. sakazakii GZcsf-1, and we confirmed that this plasmid confers multidrug resistance. We further screened plasmid-curing agents and found that p-coumaric acid had a remarkable effect on the curing of pESA3 and pGW1 at sub-inhibitory concentrations. Our study investigated the contribution of endogenous plasmids pESA3 and pGW1 by constructing plasmid-cured strains using suicide vectors and suggested that p-coumaric acid can be a safe and effective plasmid-curing agent for C. sakazakii.
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Affiliation(s)
- Xuemeng Ji
- Tianjin Key Laboratory of Food Science and Health, School of Medicine, Nankai University, Tianjin, China
| | - Ping Lu
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences and Peking Union Medical Collage, Tianjin, China
| | - Yaozhong Hu
- Tianjin Key Laboratory of Food Science and Health, School of Medicine, Nankai University, Tianjin, China
| | - Juan Xue
- Institute of Infection and Immunity, Taihe Hospital, Hubei University of Medicine, Shiyan, China
| | - Jing Wu
- Tianjin Key Laboratory of Food Science and Health, School of Medicine, Nankai University, Tianjin, China
| | - Bowei Zhang
- Tianjin Key Laboratory of Food Science and Health, School of Medicine, Nankai University, Tianjin, China
| | - Yan Zhang
- Tianjin Key Laboratory of Food Science and Health, School of Medicine, Nankai University, Tianjin, China
| | - Lu Dong
- Tianjin Key Laboratory of Food Science and Health, School of Medicine, Nankai University, Tianjin, China
| | - Huan Lv
- Tianjin Key Laboratory of Food Science and Health, School of Medicine, Nankai University, Tianjin, China
| | - Shuo Wang
- Tianjin Key Laboratory of Food Science and Health, School of Medicine, Nankai University, Tianjin, China
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Ji X, Lu P, Xue J, Zhao N, Zhang Y, Dong L, Zhang X, Li P, Hu Y, Wang J, Zhang B, Liu J, Lv H, Wang S. The lipoprotein NlpD in Cronobacter sakazakii responds to acid stress and regulates macrophage resistance and virulence by maintaining membrane integrity. Virulence 2021; 12:415-429. [PMID: 33459158 PMCID: PMC7834084 DOI: 10.1080/21505594.2020.1870336] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Cronobacter sakazakii, an emerging opportunistic pathogen, is implicated in severe foodborne outbreak infections in premature and full-term infants. Generally, acid tolerance is vital for the pathogenesis of foodborne pathogens; however, its role in C. sakazakii virulence remains largely unknown. To screen out acid-tolerance determinants from transposon mutants, anovel counterselection method using gentamicin and acid was developed. Using the counterselection method and growth assay, we screened several acid-sensitive mutants and found that nlpD encodes an acid-resistance factor in C. sakazakii. Compared to the wild-type strain, the nlpD mutant exhibited attenuated virulence in a rat model. Using macrophage THP-1 cells and a pH probe, we verified that nlpD enables bacteria to resist macrophages by resisting acidification. Finally, we confirmed that nlpD maintains C. sakazakii membrane integrity in acid using propidium iodide permeabilization assays via flow cytometry. Our results confirm that nlpD is a novel virulence factor that permits C. sakazakii to survive under acid stress conditions. Considering that NlpD is a conserved lipoprotein located in the bacterial outer membrane, NlpD could be used as a target for drug development.
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Affiliation(s)
- Xuemeng Ji
- Tianjin Key Laboratory of Food Science and Health, School of Medicine, Nankai University , Tianjin, China
| | - Ping Lu
- Institute of Radiation Medicine, Chinese Academy of Medical Science and Peking Union Medical Collage , Tianjin, China
| | - Juan Xue
- Institute of Infection and Immunity, Taihe Hospital, Hubei University of Medicine , Shiyan, China
| | - Ning Zhao
- Tianjin Key Laboratory of Food Science and Health, School of Medicine, Nankai University , Tianjin, China
| | - Yan Zhang
- Tianjin Key Laboratory of Food Science and Health, School of Medicine, Nankai University , Tianjin, China
| | - Lu Dong
- Tianjin Key Laboratory of Food Science and Health, School of Medicine, Nankai University , Tianjin, China
| | - Xuejiao Zhang
- Tianjin Key Laboratory of Food Science and Health, School of Medicine, Nankai University , Tianjin, China
| | - Ping Li
- Key Laboratory of Food Nutrition and Safety, Ministry of Education, Tianjin University of Science and Technology , Tianjin, China
| | - Yaozhong Hu
- Tianjin Key Laboratory of Food Science and Health, School of Medicine, Nankai University , Tianjin, China
| | - Jin Wang
- Tianjin Key Laboratory of Food Science and Health, School of Medicine, Nankai University , Tianjin, China
| | - Bowei Zhang
- Tianjin Key Laboratory of Food Science and Health, School of Medicine, Nankai University , Tianjin, China
| | - Jingmin Liu
- Tianjin Key Laboratory of Food Science and Health, School of Medicine, Nankai University , Tianjin, China
| | - Huan Lv
- Tianjin Key Laboratory of Food Science and Health, School of Medicine, Nankai University , Tianjin, China
| | - Shuo Wang
- Tianjin Key Laboratory of Food Science and Health, School of Medicine, Nankai University , Tianjin, China
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9
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Zhang J, Wang S, Abee T, van der Veen S. Role of Base Excision Repair in Listeria monocytogenes DNA Stress Survival During Infections. J Infect Dis 2020; 223:721-732. [PMID: 32644146 DOI: 10.1093/infdis/jiaa412] [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: 03/02/2020] [Accepted: 07/07/2020] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Base excision repair (BER), consisting mostly of lesion-specific DNA glycosylases and apurinic/apyrimidinic (AP) endonucleases, is one of the most important DNA repair mechanisms for repair of single nucleobase lesions generated by reactive oxygen and nitrogen species as part of an immune response against bacterial infections. However, few studies have addressed the contribution of BER to bacterial virulence and Listeria monocytogenes BER has thus far remained completely uncharacterized. METHODS Analysis of the L. monocytogenes EGDe genome identified 7 DNA glycosylases (MutM, MutY, Nth, Tag, Mpg, Ung, and Ung2) and 2 apurinic/apyrimidinic endonucleases (Xth and Nfo) as part of BER. Markerless in-frame deletion mutants were generated for all 9 genes, and mutants were tested for DNA damage survival, mutagenesis, and the ability to colonize a mouse model of infection. RESULTS Distinct lesion-specific phenotypes were identified for all deletion mutants. Importantly, the Δnth, ΔmutY, and Δnfo mutants were significantly attenuated for virulence in the mouse model and showed much lower colonization of the liver and spleen or were unable to compete with the wild-type strain during in vivo competition assays. CONCLUSIONS Our results highlight the importance of BER for L. monocytogenes virulence and survival of DNA-damaging insults during host colonization.
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Affiliation(s)
- Juan Zhang
- Department of Microbiology and Parasitology, School of Medicine, Zhejiang University, Hangzhou, China
| | - Shuyi Wang
- Department of Microbiology and Parasitology, School of Medicine, Zhejiang University, Hangzhou, China
| | - Tjakko Abee
- Food Microbiology, Wageningen University & Research, Wageningen, The Netherlands
| | - Stijn van der Veen
- Department of Microbiology and Parasitology, School of Medicine, Zhejiang University, Hangzhou, China.,Department of Dermatology, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, China.,State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
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Zhao N, Liu JM, Liu S, Ji XM, Lv H, Hu YZ, Wang ZH, Lv SW, Li CY, Wang S. A novel universal nano-luciferase-involved reporter system for long-term probing food-borne probiotics and pathogenic bacteria in mice by in situ bioluminescence imaging. RSC Adv 2020; 10:13029-13036. [PMID: 35492135 PMCID: PMC9051406 DOI: 10.1039/d0ra01283a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Accepted: 03/23/2020] [Indexed: 01/18/2023] Open
Abstract
Food-borne bacteria have received increasing attention due to their great impact on human health. Bioimaging makes it possible to monitor bacteria inside the living body in real time and in situ. Nano-luciferase (NLuc) as a new member of the luciferase family exhibits superior properties than the commonly used luciferases, including small size, high stability and improved luminescence. Herein, NLuc, CBRLuc and FLuc were well expressed in varied food-borne bacteria. Results showed that the signal intensity of E. coli-NLuc was about 41 times higher than E. coli-CBRLuc, L. plantarum-NLuc was nearly 227 times that of L. plantarum-FLuc in vitro. Moreover, NLuc was applied to trace L. plantarum and E. coli in vivo through the whole body and separated digestive tract imaging, as well as the feces bacterium counting and probing. The persistence of bioluminescent strains was predominantly localized in colon and cecum of mice after oral administration. The NLuc system showed its incomparable superiority, especially in the application of intestinal imaging and the universality for food-borne bacteria. We demonstrated that the NLuc system was a brilliant alternative for specific application of food-borne bacteria in vivo, aiming to collect more accurate and real-time information of food-borne bacteria from the living body for further investigation of their damage mechanism and nutrition effect. Schematic illustration of the preparation of bioluminescent bacteria and the experimental design of tracing of the foodborne bacteria in vivo.![]()
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