1
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Uruén C, Fernandez A, Arnal JL, Del Pozo M, Amoribieta MC, de Blas I, Jurado P, Calvo JH, Gottschalk M, González-Vázquez LD, Arenas M, Marín CM, Arenas J. Genomic and phenotypic analysis of invasive Streptococcus suis isolated in Spain reveals genetic diversification and associated virulence traits. Vet Res 2024; 55:11. [PMID: 38268053 PMCID: PMC10807230 DOI: 10.1186/s13567-024-01267-0] [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: 10/06/2023] [Accepted: 01/02/2024] [Indexed: 01/26/2024] Open
Abstract
Streptococcus suis is a zoonotic pathogen that causes a major health problem in the pig production industry worldwide. Spain is one of the largest pig producers in the world. This work aimed to investigate the genetic and phenotypic features of invasive S. suis isolates recovered in Spain. A panel of 156 clinical isolates recovered from 13 Autonomous Communities, representing the major pig producers, were analysed. MLST and serotyping analysis revealed that most isolates (61.6%) were assigned to ST1 (26.3%), ST123 (18.6%), ST29 (9.6%), and ST3 (7.1%). Interestingly, 34 new STs were identified, indicating the emergence of novel genetic lineages. Serotypes 9 (27.6%) and 1 (21.8%) prevailed, followed by serotypes 7 (12.8%) and 2 (12.2%). Analysis of 13 virulence-associated genes showed significant associations between ST, serotype, virulence patterns, and clinical features, evidencing particular virulence traits associated with genetic clusters. The pangenome was generated, and the core genome was distributed in 7 Bayesian groups where each group included a variable set of over- and under-represented genes of different categories. The study provides comprehensive data and knowledge to improve the design of new vaccines, antimicrobial treatments, and bacterial typing approaches.
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Affiliation(s)
- Cristina Uruén
- Unit of Microbiology and Immunology, Faculty of Veterinary, University of Zaragoza, Zaragoza, Spain
- Institute Agrofood of Aragón-IA2, University of Zaragoza-Center of Research and Technology of Aragón (CITA), Zaragoza, Spain
| | - Ana Fernandez
- Exopol. Veterinary Diagnostic and Autogenous Vaccine Laboratory, San Mateo de Gállego, Zaragoza, Spain
| | - José Luis Arnal
- Exopol. Veterinary Diagnostic and Autogenous Vaccine Laboratory, San Mateo de Gállego, Zaragoza, Spain
| | | | | | - Ignacio de Blas
- Institute Agrofood of Aragón-IA2, University of Zaragoza-Center of Research and Technology of Aragón (CITA), Zaragoza, Spain
- Unit of Infectious Diseases, Faculty of Veterinary, University of Zaragoza, Zaragoza, Spain
| | - Paula Jurado
- Unit of Microbiology and Immunology, Faculty of Veterinary, University of Zaragoza, Zaragoza, Spain
- Institute Agrofood of Aragón-IA2, University of Zaragoza-Center of Research and Technology of Aragón (CITA), Zaragoza, Spain
| | - Jorge Hugo Calvo
- Department of Animal Science, Center of Research and Technology of Aragón CITA, Zaragoza, Spain
- ARAID, Saragossa, Spain
| | - Marcelo Gottschalk
- Research Group on Infectious Diseases in Production Animals and Swine and Poultry Infectious Diseases Research Centre, Faculty of Veterinary Medicine, University of Montreal, Saint-Hyacinthe, QC, Canada
| | | | - Miguel Arenas
- Department of Biochemistry, Genetics and Immunology, University of Vigo, Vigo, Spain
- CINBIO, Vigo, Spain
| | - Clara M Marín
- Institute Agrofood of Aragón-IA2, University of Zaragoza-Center of Research and Technology of Aragón (CITA), Zaragoza, Spain
- Department of Animal Science, Center of Research and Technology of Aragón CITA, Zaragoza, Spain
| | - Jesús Arenas
- Unit of Microbiology and Immunology, Faculty of Veterinary, University of Zaragoza, Zaragoza, Spain.
- Institute Agrofood of Aragón-IA2, University of Zaragoza-Center of Research and Technology of Aragón (CITA), Zaragoza, Spain.
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2
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Dresen M, Valentin-Weigand P, Berhanu Weldearegay Y. Role of Metabolic Adaptation of Streptococcus suis to Host Niches in Bacterial Fitness and Virulence. Pathogens 2023; 12:pathogens12040541. [PMID: 37111427 PMCID: PMC10144218 DOI: 10.3390/pathogens12040541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 03/24/2023] [Accepted: 03/27/2023] [Indexed: 04/03/2023] Open
Abstract
Streptococcus suis, both a common colonizer of the porcine upper respiratory tract and an invasive pig pathogen, successfully adapts to different host environments encountered during infection. Whereas the initial infection mainly occurs via the respiratory tract, in a second step, the pathogen can breach the epithelial barrier and disseminate within the whole body. Thereby, the pathogen reaches other organs such as the heart, the joints, or the brain. In this review, we focus on the role of S. suis metabolism for adaptation to these different in vivo host niches to encounter changes in nutrient availability, host defense mechanisms and competing microbiota. Furthermore, we highlight the close link between S. suis metabolism and virulence. Mutants deficient in metabolic regulators often show an attenuation in infection experiments possibly due to downregulation of virulence factors, reduced resistance to nutritive or oxidative stress and to phagocytic activity. Finally, metabolic pathways as potential targets for new therapeutic strategies are discussed. As antimicrobial resistance in S. suis isolates has increased over the last years, the development of new antibiotics is of utmost importance to successfully fight infections in the future.
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Affiliation(s)
- Muriel Dresen
- Institute for Microbiology, University of Veterinary Medicine Hannover, 30173 Hannover, Germany
| | - Peter Valentin-Weigand
- Institute for Microbiology, University of Veterinary Medicine Hannover, 30173 Hannover, Germany
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3
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Wang J, Liang P, Sun H, Wu Z, Gottschalk M, Qi K, Zheng H. Comparative transcriptomic analysis reveal genes involved in the pathogenicity increase of Streptococcus suis epidemic strains. Virulence 2022; 13:1455-1470. [PMID: 36031944 PMCID: PMC9423846 DOI: 10.1080/21505594.2022.2116160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Streptococcus suis epidemic strains were responsible for two outbreaks in China and possessed increased pathogenicity which was featured prominently by inducing an excessive inflammatory response at the early phase of infection. To discover the critical genes responsible for the pathogenicity increase of S. suis epidemic strains, the genome-wide transcriptional profiles of epidemic strain SC84 were investigated at the early phase of interaction with BV2 cells. The overall low expression levels of 89K pathogenicity island (PAI) and 129 known virulence genes in the SC84 interaction groups indicated that its pathogenicity increase should be attributed to novel mechanisms. Using highly pathogenic strain P1/7 and intermediately pathogenic strain 89–1591 as controls, 11 pathogenicity increase crucial genes (PICGs) and 38 pathogenicity increase-related genes (PIRGs) were identified in the SC84 incubation groups. The PICGs encoded proteins related to the methionine biosynthesis/uptake pathway and played critical roles in the pathogenicity increase of epidemic strains. A high proportion of PIRGs encoded surface proteins related to host cell adherence and immune escape, which may be conducive to the pathogenicity increase of epidemic strains by rapidly initiating infection. The fact that none of PICGs and PIRGs belonged to epidemic strain-specific gene indicated that the pathogenicity increase of epidemic strain may be determined by the expression level of genes, rather than the presence of them. Our results deepened the understanding on the mechanism of the pathogenicity increase of S. suis epidemic strains and provided novel approaches to control the life-threatening infections of S. suis epidemic strains.
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Affiliation(s)
- Jianping Wang
- State Key Laboratory of Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Changping, Beijing, China
| | - Pujun Liang
- State Key Laboratory of Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Changping, Beijing, China
- OIE Reference Lab for Swine Streptococcosis, MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Hui Sun
- State Key Laboratory of Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Changping, Beijing, China
| | - Zongfu Wu
- Swine and Poultry Infectious Diseases Research Center, Faculty of Veterinary Medicine, University of Montreal, Saint-Hyacinthe, Quebec, Canada
| | - Marcelo Gottschalk
- Department of Clinical Laboratory, Nanxishan Hospital of Guangxi Zhuang Autonomous Region, Guilin, Guangxi Zhuang Autonomous Region, China
| | - Kexin Qi
- State Key Laboratory of Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Changping, Beijing, China
| | - Han Zheng
- State Key Laboratory of Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Changping, Beijing, China
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4
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Tan MF, Tan J, Zhang FF, Li HQ, Ji HY, Fang SP, Wu CC, Rao YL, Zeng YB, Yang Q. Exogenous glycogen utilization effects the transcriptome and pathogenicity of Streptococcus suis serotype 2. Front Cell Infect Microbiol 2022; 12:938286. [DOI: 10.3389/fcimb.2022.938286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Accepted: 10/24/2022] [Indexed: 11/10/2022] Open
Abstract
Streptococcus suis serotype 2 (SS2) is an important zoonotic pathogen that causes severe infections in humans and the swine industry. Acquisition and utilization of available carbon sources from challenging host environments is necessary for bacterial pathogens to ensure growth and proliferation. Glycogen is abundant in mammalian body and may support the growth of SS2 during infection in hosts. However, limited information is known about the mechanism between the glycogen utilization and host adaptation of SS2. Here, the pleiotropic effects of exogenous glycogen on SS2 were investigated through transcriptome sequencing. Analysis of transcriptome data showed that the main basic metabolic pathways, especially the core carbon metabolism pathways and virulence-associated factors, of SS2 responded actively to glycogen induction. Glycogen induction led to the perturbation of the glycolysis pathway and citrate cycle, but promoted the pentose phosphate pathway and carbohydrate transport systems. Extracellular glycogen utilization also promoted the mixed-acid fermentation in SS2 rather than homolactic fermentation. Subsequently, apuA, a gene encoding the unique bifunctional amylopullulanase for glycogen degradation, was deleted from the wild type and generated the mutant strain ΔapuA. The pathogenicity details of the wild type and ΔapuA cultured in glucose and glycogen were investigated and compared. Results revealed that the capsule synthesis or bacterial morphology were not affected by glycogen incubation or apuA deletion. However, extracellular glycogen utilization significantly enhanced the hemolytic activity, adhesion and invasion ability, and lethality of SS2. The deletion of apuA also impaired the pathogenicity of bacteria cultured in glucose, indicating that ApuA is indeed an important virulence factor. Our results revealed that exogenous glycogen utilization extensively influenced the expression profile of the S. suis genome. Based on the transcriptome response, exogenous glycogen utilization promoted the carbon adaption and pathogenicity of SS2.
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5
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Xu Q, Chen H, Sun W, Zhang Y, Zhu D, Rai KR, Chen JL, Chen Y. sRNA23, a novel small RNA, regulates to the pathogenesis of Streptococcus suis serotype 2. Virulence 2021; 12:3045-3061. [PMID: 34882070 PMCID: PMC8667912 DOI: 10.1080/21505594.2021.2008177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
Abstract
ABBREVIATION sRNA: small noncoding RNA; FBA: fructose diphosphate aldolase; rplB: 50S ribosomal protein L2; RACE: rapid amplification of cDNA ends; EMSA: electrophoretic mobility shift assay; THB: Todd-Hewitt broth; FBS: fetal bovine serum; BIP: 2,2'-Bipyridine.
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Affiliation(s)
- Quanming Xu
- Fujian Agriculture and Forestry University, Fuzhou, China.,Key Laboratory of Fujian- Fujian Agriculture and Forestry University, Fuzhou, China
| | - Hong Chen
- Fujian Agriculture and Forestry University, Fuzhou, China.,Key Laboratory of Fujian- Fujian Agriculture and Forestry University, Fuzhou, China
| | - Wen Sun
- Fujian Agriculture and Forestry University, Fuzhou, China.,Key Laboratory of Fujian- Fujian Agriculture and Forestry University, Fuzhou, China
| | - Yongyi Zhang
- Fujian Agriculture and Forestry University, Fuzhou, China.,Key Laboratory of Fujian- Fujian Agriculture and Forestry University, Fuzhou, China
| | - Dewen Zhu
- Fujian Agriculture and Forestry University, Fuzhou, China.,Key Laboratory of Fujian- Fujian Agriculture and Forestry University, Fuzhou, China
| | - Kul Raj Rai
- Fujian Agriculture and Forestry University, Fuzhou, China.,Key Laboratory of Fujian- Fujian Agriculture and Forestry University, Fuzhou, China
| | - Ji-Long Chen
- Fujian Agriculture and Forestry University, Fuzhou, China.,Key Laboratory of Fujian- Fujian Agriculture and Forestry University, Fuzhou, China
| | - Ye Chen
- Fujian Agriculture and Forestry University, Fuzhou, China.,Key Laboratory of Fujian- Fujian Agriculture and Forestry University, Fuzhou, China
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6
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McKenna S, Huse KK, Giblin S, Pearson M, Majid Al Shibar MS, Sriskandan S, Matthews S, Pease JE. The Role of Streptococcal Cell-Envelope Proteases in Bacterial Evasion of the Innate Immune System. J Innate Immun 2021; 14:69-88. [PMID: 34649250 PMCID: PMC9082167 DOI: 10.1159/000516956] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2021] [Accepted: 04/19/2021] [Indexed: 11/19/2022] Open
Abstract
Bacteria possess the ability to evolve varied and ingenious strategies to outwit the host immune system, instigating an evolutionary arms race. Proteases are amongst the many weapons employed by bacteria, which specifically cleave and neutralize key signalling molecules required for a coordinated immune response. In this article, we focus on a family of S8 subtilisin-like serine proteases expressed as cell-envelope proteases (CEPs) by group A and group B streptococci. Two of these proteases known as Streptococcus pyogenes CEP (SpyCEP) and C5a peptidase cleave the chemokine CXCL8 and the complement fragment C5a, respectively. Both CXCL8 and C5a are potent neutrophil-recruiting chemokines, and by neutralizing their activity, streptococci evade a key defence mechanism of innate immunity. We review the mechanisms by which CXCL8 and C5a recruit neutrophils and the characterization of SpyCEP and C5a peptidase, including both in vitro and in vivo studies. Recently described structural insights into the function of this CEP family are also discussed. We conclude by examining the progress of prototypic vaccines incorporating SpyCEP and C5a peptidase in their preparation. Since streptococci-producing SpyCEP and C5a peptidase are responsible for a considerable global disease burden, targeting these proteases by vaccination strategies or by small-molecule antagonists should provide protection from and promote the resolution of streptococcal infections.
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Affiliation(s)
- Sophie McKenna
- Department of Life Sciences, Imperial College London, London, United Kingdom
| | - Kristin Krohn Huse
- Department of Infectious Disease, Imperial College London, London, United Kingdom
| | - Sean Giblin
- National Heart and Lung Institute, Imperial College London, London, United Kingdom
| | - Max Pearson
- Department of Infectious Disease, Imperial College London, London, United Kingdom
| | | | - Shiranee Sriskandan
- Department of Infectious Disease, Imperial College London, London, United Kingdom
| | - Stephen Matthews
- Department of Life Sciences, Imperial College London, London, United Kingdom
| | - James Edward Pease
- National Heart and Lung Institute, Imperial College London, London, United Kingdom
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7
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Tohya M, Dozaki S, Ishida-Kuroki K, Watanabe T, Sekizaki T. Basis of the persistence of capsule-negative Streptococcus suis in porcine endocarditis inferred from comparative genomics. FEMS Microbiol Lett 2021; 368:6315327. [PMID: 34223887 DOI: 10.1093/femsle/fnab083] [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: 04/04/2021] [Accepted: 07/01/2021] [Indexed: 11/14/2022] Open
Abstract
The capsule (cap) of Streptococcus suis is an anti-phagocytic element and is one of the major virulence factors. However, we have found cap-positive and cap-negative isolates in porcine endocarditis. Here, we compared genome sequences of multiple cap-negative isolates with those of a cap-positive isolate from a single endocarditis. Cap-positive and cap-negative isolates from the same pig were phylogenetically closest compared with those from other pigs. Some of cap-negative isolates from the same pig showed different mutations in capsular polysaccharide synthesis (cps) genes, suggesting that these isolates arisen in pigs after infection. Different mutations in whole-genomes were also found among isolates with identical mutations in cps genes, indicating that mutations in cps genes and the whole-genome occurred independently. Since cap-negative isolates are rarely found in lesions of other diseases, these results suggest that endocarditis lesions may simply favored cap-negative mutants to survive the niches, leading to their persistence in the lesions.
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Affiliation(s)
- Mari Tohya
- Research Center for Food Safety, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan.,Department of Microbiology, Juntendo University School of Medicine, Hongo 2-1-1, Bunkyo-ku, Tokyo 113-8421, Japan
| | - Shinichi Dozaki
- Research Center for Food Safety, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Kasumi Ishida-Kuroki
- Research Center for Food Safety, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan.,Antimicrobial Resistance Research Center, National Institute of Infectious Diseases, Aoba-cho 4-2-1, Higashimurayama, Tokyo, 189-0002, Japan
| | - Takayasu Watanabe
- Research Center for Food Safety, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan.,Department of Chemistry, Nihon University School of Dentistry, 1-8-13 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8310, Japan
| | - Tsutomu Sekizaki
- Research Center for Food Safety, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan.,Department of Microbiology, Graduate School of Medicine, Kyoto University, Yoshida-Konoe-cho, Sakyo-ku, Kyoto, 606-8501, Japan
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8
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Zheng C, Wei M, Qiu J, Li J. A Markerless Gene Deletion System in Streptococcus suis by Using the Copper-Inducible Vibrio parahaemolyticus YoeB Toxin as a Counterselectable Marker. Microorganisms 2021; 9:microorganisms9051095. [PMID: 34069706 PMCID: PMC8160710 DOI: 10.3390/microorganisms9051095] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Revised: 05/14/2021] [Accepted: 05/18/2021] [Indexed: 01/08/2023] Open
Abstract
Streptococcus suis is an important zoonotic pathogen causing severe infections in swine and humans. Induction of the Vibrio parahaemolyticus YoeB toxin in Escherichia coli resulted in cell death, leading to the speculation that YoeBVp can be a counterselectable marker. Herein, the counterselection potential of YoeBVp was assessed in S. suis. The yoeBVp gene was placed under the copper-induced promoter PcopA. The PcopA-yoeBVp construct was cloned into the S. suis-E. coli shuttle vector pSET2 and introduced into S. suis to assess the effect of YoeBVp expression on S. suis growth. Reverse transcription quantitative PCR showed that copper induced yoeBVp expression. Growth curve analyses and spot dilution assays showed that YoeBVp expression inhibited S. suis growth both in liquid media and on agar plates, revealing that YoeBVp has the potential to be a counterselectable marker for S. suis. A SCIY cassette comprising the spectinomycin-resistance gene and copper-induced yoeBVp was constructed. Using the SCIY cassette and peptide-induced competence, a novel two-step markerless gene deletion method was established for S. suis. Moreover, using the ΔperR mutant generated by this method, we demonstrated that PmtA, a ferrous iron and cobalt efflux pump in S. suis, was negatively regulated by the PerR regulator.
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Affiliation(s)
- Chengkun Zheng
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou 225009, China; (M.W.); (J.Q.)
- Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou 225009, China
- Correspondence:
| | - Man Wei
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou 225009, China; (M.W.); (J.Q.)
- Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou 225009, China
| | - Jun Qiu
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou 225009, China; (M.W.); (J.Q.)
- Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou 225009, China
| | - Jinquan Li
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China;
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9
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Yue C, Hu C, Xiang P, Zhang S, Xiao H, Zhou W, Jin H, Shi D, Li J, Xu L, Chen Y, Zeng Y. Autophagy is a defense mechanism controlling Streptococcus suis serotype 2 infection in murine microglia cells. Vet Microbiol 2021; 258:109103. [PMID: 33991788 DOI: 10.1016/j.vetmic.2021.109103] [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: 02/06/2021] [Accepted: 05/05/2021] [Indexed: 01/03/2023]
Abstract
Streptococcus suis (S. suis) is an important swine and human pathogen, causing severe meningitis with high morbidity and mortality worldwide. Microglial activation and inflammation are responsible for bacterial meningitis. S. suis has been identified to activate microglia, but the role of autophagy following S. suis infection in microglial cells remains elusive. In this study, using western blot, immunofluorescent staining and transmission electron microscopy (TEM), we demonstrated that S. suis serotype 2 (SS2) triggered autophagosome and enhanced autophagic flux in BV2 microglial cells. Autophagy activators, rapamycin, could further promote autophagy in S. suis-infected BV2 cells. Conversely, autophagy inhibitors including siRNA targeting ATG5, Beclin-1, ATG9a and ATG12 attenuated the autophagic process. Consistent with the in vitro results, autophagy was activated following S. suis infection in brain tissue including frontal cortex and hippocampus in a mouse model of meningitis. Further experiment showed that autophagy serves as a cellular defense mechanism to limit invaded bacteria and microglia inflammation in S. suis-infected BV2 cells. This is the first study reporting that the interaction between autophagy and microglia cells in response to S. suis infection. The possible mechanism involved could additionally suggest potential therapeutic approaches for bacterial meningitis.
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Affiliation(s)
- Chaoxiong Yue
- Brain Science and Advanced Technology Institute, Wuhan University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Occupational Hazard Identification and Control, Wuhan University of Science and Technology, Wuhan, China
| | - Chenlu Hu
- Brain Science and Advanced Technology Institute, Wuhan University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Occupational Hazard Identification and Control, Wuhan University of Science and Technology, Wuhan, China
| | - Peng Xiang
- Brain Science and Advanced Technology Institute, Wuhan University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Occupational Hazard Identification and Control, Wuhan University of Science and Technology, Wuhan, China
| | - Siming Zhang
- Brain Science and Advanced Technology Institute, Wuhan University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Occupational Hazard Identification and Control, Wuhan University of Science and Technology, Wuhan, China
| | - Hongde Xiao
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Wei Zhou
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Hui Jin
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Deshi Shi
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Jinquan Li
- Brain Science and Advanced Technology Institute, Wuhan University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Occupational Hazard Identification and Control, Wuhan University of Science and Technology, Wuhan, China
| | - Lang Xu
- Brain Science and Advanced Technology Institute, Wuhan University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Occupational Hazard Identification and Control, Wuhan University of Science and Technology, Wuhan, China
| | - Yushan Chen
- Brain Science and Advanced Technology Institute, Wuhan University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Occupational Hazard Identification and Control, Wuhan University of Science and Technology, Wuhan, China.
| | - Yan Zeng
- Brain Science and Advanced Technology Institute, Wuhan University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Occupational Hazard Identification and Control, Wuhan University of Science and Technology, Wuhan, China.
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10
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Arenas J, Zomer A, Harders-Westerveen J, Bootsma HJ, De Jonge MI, Stockhofe-Zurwieden N, Smith HE, De Greeff A. Identification of conditionally essential genes for Streptococcus suis infection in pigs. Virulence 2021; 11:446-464. [PMID: 32419603 PMCID: PMC7239030 DOI: 10.1080/21505594.2020.1764173] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Streptococcus suis is a Gram-positive bacterium and zoonotic pathogen that causes meningitis and sepsis in pigs and humans. The aim of this study was to identify genes required for S. suis infection. We created Tn-Seq libraries in a virulent S. suis strain 10, which was used to inoculate pigs in an intrathecal experimental infection. Comparative analysis of the relative abundance of mutants recovered from different sites of infection (blood, cerebrospinal fluid, and meninges of the brain) identified 361 conditionally essential genes, i.e. required for infection, which is about 18% of the genome. The conditionally essential genes were primarily involved in metabolic and transport processes, regulation, ribosomal structure and biogenesis, transcription, and cell wall membrane and envelope biogenesis, stress defenses, and immune evasion. Directed mutants were created in a set of 10 genes of different genetic ontologies and their role was determined in ex vivo models. Mutants showed different levels of sensitivity to survival in whole blood, serum, cerebrospinal fluid, thermic shock, and stress conditions, as compared to the wild type. Additionally, the role of three selected mutants was validated in co-infection experiments in which pigs were infected with both wild type and isogenic mutant strains. The genetic determinants of infection identified in this work contribute to novel insights in S. suis pathogenesis and could serve as targets for novel vaccines or antimicrobial drugs.
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Affiliation(s)
- Jesús Arenas
- Department of Infection Biology, Wageningen Bioveterinary Research (WBVR), Lelystad, The Netherlands.,Unit of Microbiology and Immunology, Faculty of Veterinary, University of Zaragoza, Zaragoza, Spain
| | - Aldert Zomer
- Department of Infectious Diseases and Immunology, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands.,Section Pediatric Infectious Diseases, Laboratory of Medical Immunology, Radboud, Institute for Molecular Life Sciences, Radboudumc, Nijmegen, The Netherlands
| | - Jose Harders-Westerveen
- Department of Infection Biology, Wageningen Bioveterinary Research (WBVR), Lelystad, The Netherlands
| | - Hester J Bootsma
- Section Pediatric Infectious Diseases, Laboratory of Medical Immunology, Radboud, Institute for Molecular Life Sciences, Radboudumc, Nijmegen, The Netherlands
| | - Marien I De Jonge
- Section Pediatric Infectious Diseases, Laboratory of Medical Immunology, Radboud, Institute for Molecular Life Sciences, Radboudumc, Nijmegen, The Netherlands
| | | | - Hilde E Smith
- Department of Infection Biology, Wageningen Bioveterinary Research (WBVR), Lelystad, The Netherlands
| | - Astrid De Greeff
- Department of Infection Biology, Wageningen Bioveterinary Research (WBVR), Lelystad, The Netherlands
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11
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Huang W, Chen Y, Li Q, Jiang H, Lv Q, Zheng Y, Han X, Kong D, Liu P, Jiang Y. LytR plays a role in normal septum formation and contributes to full virulence in Streptococcus suis. Vet Microbiol 2021; 254:109003. [PMID: 33561639 DOI: 10.1016/j.vetmic.2021.109003] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Accepted: 01/24/2021] [Indexed: 10/22/2022]
Abstract
Streptococcus suis (S. suis) is a major zoonotic pathogen and is also responsible for variety of diseases in swine. LytR-CpsA-Psr (LCP) family proteins affect the biofilm formation and virulence of some Gram-positive bacteria, but we know nothing about their roles in S. suis. In this study, we constructed the LytR mutant and its revertant strains by natural transformation and verified them by PCR and western blot. We explored the effects of LytR on the cell morphology of S. suis. Transmission electron microscopic analysis showed that the mutant strain displayed aberrant septum placement with no obvious differences in capsular thickness. Crystal violet staining and laser-scanning confocal microscopy both revealed that LytR contributes to the biofilm formation of S. suis. The LytR mutant strain had reduced survival in whole human blood and was more sensitive to killing by polymorphonuclear leukocytes (PMNs). Furthermore, in a mouse infection model, the LytR mutant strain also exhibited significantly attenuated virulence and was more easily cleared in the blood. These results indicate that the LytR protein is involved in septum placement, biofilm formation and required for full virulence of S. suis during infection.
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Affiliation(s)
- Wenhua Huang
- State Key Laboratory of Pathogens and Biosecurity, Institute of Microbiology and Epidemiology, Beijing, 100071, China
| | - Ying Chen
- School of Light Industry, Beijing Technology & Business University (BTBU), Beijing, 100048, China
| | - Qian Li
- State Key Laboratory of Pathogens and Biosecurity, Institute of Microbiology and Epidemiology, Beijing, 100071, China
| | - Hua Jiang
- State Key Laboratory of Pathogens and Biosecurity, Institute of Microbiology and Epidemiology, Beijing, 100071, China
| | - Qingyu Lv
- State Key Laboratory of Pathogens and Biosecurity, Institute of Microbiology and Epidemiology, Beijing, 100071, China
| | - Yuling Zheng
- State Key Laboratory of Pathogens and Biosecurity, Institute of Microbiology and Epidemiology, Beijing, 100071, China
| | - Xuelian Han
- State Key Laboratory of Pathogens and Biosecurity, Institute of Microbiology and Epidemiology, Beijing, 100071, China
| | - Decong Kong
- State Key Laboratory of Pathogens and Biosecurity, Institute of Microbiology and Epidemiology, Beijing, 100071, China.
| | - Peng Liu
- State Key Laboratory of Pathogens and Biosecurity, Institute of Microbiology and Epidemiology, Beijing, 100071, China.
| | - Yongqiang Jiang
- State Key Laboratory of Pathogens and Biosecurity, Institute of Microbiology and Epidemiology, Beijing, 100071, China.
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12
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Tram G, Jennings MP, Blackall PJ, Atack JM. Streptococcus suis pathogenesis-A diverse array of virulence factors for a zoonotic lifestyle. Adv Microb Physiol 2021; 78:217-257. [PMID: 34147186 DOI: 10.1016/bs.ampbs.2020.12.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Streptococcus suis is a major cause of respiratory tract and invasive infections in pigs and is responsible for a substantial disease burden in the pig industry. S. suis is also a significant cause of bacterial meningitis in humans, particularly in South East Asia. S. suis expresses a wide array of virulence factors, and although many are described as being required for disease, no single factor has been demonstrated to be absolutely required. The lack of uniform distribution of known virulence factors among individual strains and lack of evidence that any particular virulence factor is essential for disease makes the development of vaccines and treatments challenging. Here we review the current understanding of S. suis virulence factors and their role in the pathogenesis of this important zoonotic pathogen.
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Affiliation(s)
- Greg Tram
- Institute for Glycomics, Griffith University, Gold Coast, QLD, Australia
| | - Michael P Jennings
- Institute for Glycomics, Griffith University, Gold Coast, QLD, Australia
| | - Patrick J Blackall
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, QLD, Australia
| | - John M Atack
- Institute for Glycomics, Griffith University, Gold Coast, QLD, Australia.
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13
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Paulson AR, O’Callaghan M, Zhang XX, Rainey PB, Hurst MRH. In vivo transcriptome analysis provides insights into host-dependent expression of virulence factors by Yersinia entomophaga MH96, during infection of Galleria mellonella. G3 (BETHESDA, MD.) 2021; 11:jkaa024. [PMID: 33561230 PMCID: PMC7849909 DOI: 10.1093/g3journal/jkaa024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Accepted: 11/19/2020] [Indexed: 12/31/2022]
Abstract
The function of microbes can be inferred from knowledge of genes specifically expressed in natural environments. Here, we report the in vivo transcriptome of the entomopathogenic bacterium Yersinia entomophaga MH96, captured during initial, septicemic, and pre-cadaveric stages of intrahemocoelic infection in Galleria mellonella. A total of 1285 genes were significantly upregulated by MH96 during infection; 829 genes responded to in vivo conditions during at least one stage of infection, 289 responded during two stages of infection, and 167 transcripts responded throughout all three stages of infection compared to in vitro conditions at equivalent cell densities. Genes upregulated during the earliest infection stage included components of the insecticidal toxin complex Yen-TC (chi1, chi2, and yenC1), genes for rearrangement hotspot element containing protein yenC3, cytolethal distending toxin cdtAB, and vegetative insecticidal toxin vip2. Genes more highly expressed throughout the infection cycle included the putative heat-stable enterotoxin yenT and three adhesins (usher-chaperone fimbria, filamentous hemagglutinin, and an AidA-like secreted adhesin). Clustering and functional enrichment of gene expression data also revealed expression of genes encoding type III and VI secretion system-associated effectors. Together these data provide insight into the pathobiology of MH96 and serve as an important resource supporting efforts to identify novel insecticidal agents.
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Affiliation(s)
- Amber R Paulson
- Forage Science, AgResearch Ltd., Lincoln 8140, New Zealand
- New Zealand Institute for Advanced Study, Massey University, Auckland 0745, New Zealand
- Department of Biology, Queen’s University, Kingston, ON K7L 3N6, Canada
| | | | - Xue-Xian Zhang
- School of Natural and Computational Sciences, Massey University, Auckland 0745, New Zealand
| | - Paul B Rainey
- New Zealand Institute for Advanced Study, Massey University, Auckland 0745, New Zealand
- Laboratoire de Génétique de l’Evolution CBI, ESPCI Paris, Université PSL, CNRS, Paris 75005, France
- Department of Microbial Population Biology, Max Planck Institute for Evolutionary Biology, Plön 24306, Germany
| | - Mark R H Hurst
- Forage Science, AgResearch Ltd., Lincoln 8140, New Zealand
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14
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Pei X, Liu J, Liu M, Zhou H, Wang X, Fan H. Quantitative proteomics revealed modulation of macrophages by MetQ gene of Streptococcus suis serotype 2. AMB Express 2020; 10:195. [PMID: 33125582 PMCID: PMC7599288 DOI: 10.1186/s13568-020-01131-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Accepted: 10/18/2020] [Indexed: 11/10/2022] Open
Abstract
Streptococcus suis serotype 2 (SS2) is a serious zoonotic pathogen; it can lead to symptoms of streptococcal toxic shock syndrome (STSS) in humans and sepsis in pigs, and poses a great threat to public health. The SS2 MetQ gene deletion strain has attenuated antiphagocytosis, although the mechanism of antiphagocytosis and pathogenesis of MetQ in SS2 has remained unclear. In this study, stable isotope labeling by amino acids in cell culture (SILAC) based liquid chromatography–mass spectrometry (LC–MS) and subsequent bioinformatics analysis was used to determine differentially expressed proteins of RAW264.7 cells infected with △MetQ and ZY05719. Proteomic results were verified by quantitative real-time polymerase chain reaction (qRT-PCR) and Western blotting for selected proteins. Further research was focused mainly on immune system processes related to downregulated proteins, such as Src and Ccl9, and actin cytoskeleton and endocytosis related upregulated proteins, like Pstpip1 and Ppp1r9b. The proteomic results in this study shed light on the mechanism of antiphagocytosis and innate immunity of macrophages infected with △MetQ and ZY05719, which might provide novel targets to prevent or control the infection of SS2.
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15
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Zheng C, Wei M, Jia M, Cao M. Involvement of Various Enzymes in the Physiology and Pathogenesis of Streptococcus suis. Vet Sci 2020; 7:vetsci7040143. [PMID: 32977655 PMCID: PMC7712317 DOI: 10.3390/vetsci7040143] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Revised: 09/21/2020] [Accepted: 09/21/2020] [Indexed: 12/19/2022] Open
Abstract
Streptococcus suis causes severe infections in both swine and humans, making it a serious threat to the swine industry and public health. Insight into the physiology and pathogenesis of S. suis undoubtedly contributes to the control of its infection. During the infection process, a wide variety of virulence factors enable S. suis to colonize, invade, and spread in the host, thus causing localized infections and/or systemic diseases. Enzymes catalyze almost all aspects of metabolism in living organisms. Numerous enzymes have been characterized in extensive detail in S. suis, and have shown to be involved in the pathogenesis and/or physiology of this pathogen. In this review, we describe the progress in the study of some representative enzymes in S. suis, such as ATPases, immunoglobulin-degrading enzymes, and eukaryote-like serine/threonine kinase and phosphatase, and we highlight the important role of various enzymes in the physiology and pathogenesis of this pathogen. The controversies about the current understanding of certain enzymes are also discussed here. Additionally, we provide suggestions about future directions in the study of enzymes in S. suis.
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Affiliation(s)
- Chengkun Zheng
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou 225009, China; (M.W.); (M.J.)
- Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou 225009, China
- Correspondence: ; Tel.: +86-152-0527-9658
| | - Man Wei
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou 225009, China; (M.W.); (M.J.)
- Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou 225009, China
| | - Mengdie Jia
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou 225009, China; (M.W.); (M.J.)
- Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou 225009, China
| | - ManMan Cao
- Guangdong Maoming Agriculture & Forestry Techical College, Maoming 525000, China;
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16
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Zheng C, Jia M, Gao M, Lu T, Li L, Zhou P. PmtA functions as a ferrous iron and cobalt efflux pump in Streptococcus suis. Emerg Microbes Infect 2020; 8:1254-1264. [PMID: 31469035 PMCID: PMC7012047 DOI: 10.1080/22221751.2019.1660233] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Transition metals are nutrients essential for life. However, an excess of metals can be toxic to cells, and host-imposed metal toxicity is an important mechanism for controlling bacterial infection. Accordingly, bacteria have evolved metal efflux systems to maintain metal homeostasis. Here, we established that PmtA functions as a ferrous iron [Fe(II)] and cobalt [Co(II)] efflux pump in Streptococcus suis, an emerging zoonotic pathogen responsible for severe infections in both humans and pigs. pmtA expression is induced by Fe(II), Co(II), and nickel [Ni(II)], whereas PmtA protects S. suis against Fe(II) and ferric iron [Fe(III)]-induced bactericidal effect, as well as Co(II) and zinc [Zn(II)]-induced bacteriostatic effect. In the presence of elevated concentrations of Fe(II) and Co(II), ΔpmtA accumulates high levels of intracellular iron and cobalt, respectively. ΔpmtA is also more sensitive to streptonigrin, a Fe(II)-activated antibiotic. Furthermore, growth defects of ΔpmtA under Fe(II) or Co(II) excess conditions can be alleviated by manganese [Mn(II)] supplementation. Finally, PmtA plays a role in tolerance to H2O2-induced oxidative stress, yet is not involved in the virulence of S. suis in mice. Together, these data demonstrate that S. suis PmtA acts as a Fe(II) and Co(II) efflux pump, and contributes to oxidative stress resistance.
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Affiliation(s)
- Chengkun Zheng
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University , Yangzhou , People's Republic of China.,Jiangsu Key Laboratory of Zoonosis, Yangzhou University , Yangzhou , People's Republic of China.,State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University , Wuhan , People's Republic of China
| | - Mengdie Jia
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University , Yangzhou , People's Republic of China.,Jiangsu Key Laboratory of Zoonosis, Yangzhou University , Yangzhou , People's Republic of China
| | - Miaomiao Gao
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University , Yangzhou , People's Republic of China.,Jiangsu Key Laboratory of Zoonosis, Yangzhou University , Yangzhou , People's Republic of China
| | - Tianyu Lu
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University , Yangzhou , People's Republic of China.,Jiangsu Key Laboratory of Zoonosis, Yangzhou University , Yangzhou , People's Republic of China
| | - Lingzhi Li
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University , Yangzhou , People's Republic of China.,Jiangsu Key Laboratory of Zoonosis, Yangzhou University , Yangzhou , People's Republic of China
| | - Pingping Zhou
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University , Yangzhou , People's Republic of China.,Jiangsu Key Laboratory of Zoonosis, Yangzhou University , Yangzhou , People's Republic of China
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17
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CopA Protects Streptococcus suis against Copper Toxicity. Int J Mol Sci 2019; 20:ijms20122969. [PMID: 31216645 PMCID: PMC6628060 DOI: 10.3390/ijms20122969] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2019] [Revised: 06/15/2019] [Accepted: 06/16/2019] [Indexed: 12/17/2022] Open
Abstract
Streptococcus suis is a zoonotic pathogen that causes great economic losses to the swine industry and severe threats to public health. A better understanding of its physiology would contribute to the control of its infections. Although copper is an essential micronutrient for life, it is toxic to cells when present in excessive amounts. Herein, we provide evidence that CopA is required for S. suis resistance to copper toxicity. Quantitative PCR analysis showed that copA expression was specifically induced by copper. Growth curve analyses and spot dilution assays showed that the ΔcopA mutant was defective in media supplemented with elevated concentrations of copper. Spot dilution assays also revealed that CopA protected S. suis against the copper-induced bactericidal effect. Using inductively coupled plasma-optical emission spectroscopy, we demonstrated that the role of CopA in copper resistance was mediated by copper efflux. Collectively, our data indicated that CopA protects S. suis against the copper-induced bactericidal effect via copper efflux.
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