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Peng J, Lelis T, Chen R, Barphagha I, Osti S, Ham JH. tepR encoding a bacterial enhancer-binding protein orchestrates the virulence and interspecies competition of Burkholderia glumae through qsmR and a type VI secretion system. MOLECULAR PLANT PATHOLOGY 2020; 21:1042-1054. [PMID: 32608174 PMCID: PMC7368122 DOI: 10.1111/mpp.12947] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 03/23/2020] [Accepted: 05/04/2020] [Indexed: 05/05/2023]
Abstract
The pathogenesis of the rice pathogenic bacterium Burkholderia glumae is under the tight regulation of the tofI/tofR quorum-sensing (QS) system. tepR, encoding a group I bacterial enhancer-binding protein, negatively regulates the production of toxoflavin, the phytotoxin acting as a major virulence factor in B. glumae. In this study, through a transcriptomic analysis, we identified the genes that were modulated by tepR and/or the tofI/tofR QS system. More than half of the differentially expressed genes, including the genes for the biosynthesis and transport of toxoflavin, were significantly more highly expressed in the ΔtepR mutant but less expressed in the ΔtofI-tofR (tofI/tofR QS-defective) mutant. In consonance with the transcriptome data, other virulence-related functions of B. glumae, extracellular protease activity and flagellum-dependent motility, were also negatively regulated by tepR, and this negative regulatory function of tepR was dependent on the IclR-type transcriptional regulator gene qsmR. Likewise, the ΔtepR mutant exhibited a higher level of heat tolerance in congruence with the higher transcription levels of heat shock protein genes in the mutant. Interestingly, tepR also exhibited its positive regulatory function on a previously uncharacterized type VI secretion system (denoted as BgT6SS-1). The survival of the both ΔtepR and ΔtssD (BgT6SS-1-defective) mutants was significantly compromised compared to the wild-type parent strain 336gr-1 in the presence of the natural rice-inhabiting bacterium, Pantoea sp. RSPAM1. Taken together, this study revealed pivotal regulatory roles of tepR in orchestrating multiple biological functions of B. glumae, including pathogenesis, heat tolerance, and bacterial interspecies competition.
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Affiliation(s)
- Jingyu Peng
- Department of Plant Pathology and Crop PhysiologyLouisiana State University Agricultural CenterBaton RougeLAUSA
- Present address:
Department of Plant, Soil, and Microbial SciencesMichigan State UniversityEast LansingMI48824USA
| | - Tiago Lelis
- Department of Plant Pathology and Crop PhysiologyLouisiana State University Agricultural CenterBaton RougeLAUSA
- Tropical Research and Education CenterInstitute of Food and Agriculture SciencesUniversity of FloridaHomesteadFLUSA
| | - Ruoxi Chen
- Department of Plant Pathology and Crop PhysiologyLouisiana State University Agricultural CenterBaton RougeLAUSA
- Present address:
1501 Capitol AvenueSacramentoCA95814USA
| | - Inderjit Barphagha
- Department of Plant Pathology and Crop PhysiologyLouisiana State University Agricultural CenterBaton RougeLAUSA
| | - Surendra Osti
- Department of Plant Pathology and Crop PhysiologyLouisiana State University Agricultural CenterBaton RougeLAUSA
- Present address:
Department of Agricultural Economics and AgribusinessLouisiana State UniversityBaton RougeLA70803USA
| | - Jong Hyun Ham
- Department of Plant Pathology and Crop PhysiologyLouisiana State University Agricultural CenterBaton RougeLAUSA
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Abdel-Sattar ES, Miyoshi SI, Elgaml A. Regulation ofVibrio mimicusmetalloprotease (VMP) production by the quorum-sensing master regulatory protein, LuxR. J Basic Microbiol 2016; 56:1051-1058. [DOI: 10.1002/jobm.201600002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2016] [Accepted: 04/19/2016] [Indexed: 11/09/2022]
Affiliation(s)
- El-Shaymaa Abdel-Sattar
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences; Okayama University; 1-1-1, Tsushima-Naka, Kita-Ku Okayama Japan
- Chemical Industries Development Company; Assiut Egypt
| | - Shin-ichi Miyoshi
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences; Okayama University; 1-1-1, Tsushima-Naka, Kita-Ku Okayama Japan
| | - Abdelaziz Elgaml
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences; Okayama University; 1-1-1, Tsushima-Naka, Kita-Ku Okayama Japan
- Faculty of Pharmacy, Department of Microbiology and Immunology; Mansoura University; Elgomhouria Street Mansoura Egypt
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Guardiola-Avila I, Acedo-Felix E, Sifuentes-Romero I, Yepiz-Plascencia G, Gomez-Gil B, Noriega-Orozco L. Molecular and Genomic Characterization of Vibrio mimicus Isolated from a Frozen Shrimp Processing Facility in Mexico. PLoS One 2016; 11:e0144885. [PMID: 26730584 PMCID: PMC4701432 DOI: 10.1371/journal.pone.0144885] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Accepted: 11/24/2015] [Indexed: 11/21/2022] Open
Abstract
Vibrio mimicus is a gram-negative bacterium responsible for diseases in humans. Three strains of V. mimicus identified as V. mimicus 87, V. mimicus 92 and V. mimicus 93 were isolated from a shrimp processing facility in Guaymas, Sonora, Mexico. The strains were analyzed using several molecular techniques and according to the cluster analysis they were different, their similarities ranged between 51.3% and 71.6%. ERIC-PCR and RAPD (vmh390R) were the most discriminatory molecular techniques for the differentiation of these strains. The complete genomes of two strains (V. mimicus 87, renamed as CAIM 1882, and V. mimicus 92, renamed as CAIM 1883) were sequenced. The sizes of the genomes were 3.9 Mb in both strains, with 2.8 Mb in ChI and 1.1 Mb in ChII. A 12.7% difference was found in the proteome content (BLAST matrix). Several virulence genes were detected (e.g. capsular polysaccharide, an accessory colonization factor and genes involved in quorum-sensing) which were classified in 16 categories. Variations in the gene content between these genomes were observed, mainly in proteins and virulence genes (e.g., hemagglutinin, mobile elements and membrane proteins). According to these results, both strains were different, even when they came from the same source, giving an insight of the diversity of V. mimicus. The identification of various virulence genes, including a not previously reported V. mimicus gene (acfD) in ChI in all sequenced strains, supports the pathogenic potential of this species. Further analysis will help to fully understand their potential virulence, environmental impact and evolution.
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Affiliation(s)
| | - Evelia Acedo-Felix
- Centro de Investigación en Alimentación y Desarrollo, A.C Hermosillo, Sonora, México
| | - Itzel Sifuentes-Romero
- Mazatlán Unit for Aquaculture and Environmental Management. Centro de Investigación en Alimentación y Desarrollo, A.C. Mazatlán, Sinaloa, México
| | | | - Bruno Gomez-Gil
- Mazatlán Unit for Aquaculture and Environmental Management. Centro de Investigación en Alimentación y Desarrollo, A.C. Mazatlán, Sinaloa, México
| | - Lorena Noriega-Orozco
- Guaymas Unit: Quality Assurance and Management of Natural Resources. Centro de Investigación en Alimentación y Desarrollo, A.C. Guaymas, Sonora, México
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Zhao J, Chen M, Quan CS, Fan SD. Mechanisms of quorum sensing and strategies for quorum sensing disruption in aquaculture pathogens. JOURNAL OF FISH DISEASES 2015; 38:771-786. [PMID: 25219871 DOI: 10.1111/jfd.12299] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2014] [Revised: 07/02/2014] [Accepted: 07/07/2014] [Indexed: 06/03/2023]
Abstract
In many countries, infectious diseases are a considerable threat to aquaculture. The pathogenicity of micro-organisms that infect aquaculture systems is closely related to the release of virulence factors and the formation of biofilms, both of which are regulated by quorum sensing (QS). Thus, QS disruption is a potential strategy for preventing disease in aquaculture systems. QS inhibitors (QSIs) not only inhibit the expression of virulence-associated genes but also attenuate the virulence of aquaculture pathogens. In this review, we discuss QS systems in important aquaculture pathogens and focus on the relationship between QS mechanisms and bacterial virulence in aquaculture. We further elucidate QS disruption strategies for targeting aquaculture pathogens. Four main types of QSIs that target aquaculture pathogens are discussed based on their mechanisms of action.
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Affiliation(s)
- J Zhao
- Key Laboratory of Biochemical Engineering State Ethnic Affairs Commission-Ministry of Education, Dalian Nationalities University, Dalian, China
- College of Life Science, Dalian Nationalities University, Dalian, China
| | - M Chen
- College of Bioengineering, Dalian Polytechnic University, Dalian, China
| | - C S Quan
- Key Laboratory of Biochemical Engineering State Ethnic Affairs Commission-Ministry of Education, Dalian Nationalities University, Dalian, China
- College of Life Science, Dalian Nationalities University, Dalian, China
| | - S D Fan
- Key Laboratory of Biochemical Engineering State Ethnic Affairs Commission-Ministry of Education, Dalian Nationalities University, Dalian, China
- College of Life Science, Dalian Nationalities University, Dalian, China
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Miyoshi SI. Extracellular proteolytic enzymes produced by human pathogenic vibrio species. Front Microbiol 2013; 4:339. [PMID: 24302921 PMCID: PMC3831164 DOI: 10.3389/fmicb.2013.00339] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2013] [Accepted: 10/26/2013] [Indexed: 12/19/2022] Open
Abstract
Bacteria in the genus Vibrio produce extracellular proteolytic enzymes to obtain nutrients via digestion of various protein substrates. However, the enzymes secreted by human pathogenic species have been documented to modulate the bacterial virulence. Several species including Vibrio cholerae and V. vulnificus are known to produce thermolysin-like metalloproteases termed vibriolysin. The vibriolysin from V. vulnificus, a causative agent of serious systemic infection, is a major toxic factor eliciting the secondary skin damage characterized by formation of the hemorrhagic brae. The vibriolysin from intestinal pathogens may play indirect roles in pathogenicity because it can activate protein toxins and hemagglutinin by the limited proteolysis and can affect the bacterial attachment to or detachment from the intestinal surface by degradation of the mucus layer. Two species causing wound infections, V. alginolyticus and V. parahaemolyticus, produce another metalloproteases so-called collagenases. Although the detailed pathological roles have not been studied, the collagenase is potent to accelerate the bacterial dissemination through digestion of the protein components of the extracellular matrix. Some species produce cymotrypsin-like serine proteases, which may also affect the bacterial virulence potential. The intestinal pathogens produce sufficient amounts of the metalloprotease at the small intestinal temperature; however, the metalloprotease production by extra-intestinal pathogens is much higher around the body surface temperature. On the other hand, the serine protease is expressed only in the absence of the metalloprotease.
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Affiliation(s)
- Shin-Ichi Miyoshi
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University Okayama, Japan
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Natrah FMI, Ruwandeepika HAD, Pawar S, Karunasagar I, Sorgeloos P, Bossier P, Defoirdt T. Regulation of virulence factors by quorum sensing in Vibrio harveyi. Vet Microbiol 2011; 154:124-9. [PMID: 21775075 DOI: 10.1016/j.vetmic.2011.06.024] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2011] [Revised: 06/15/2011] [Accepted: 06/23/2011] [Indexed: 11/26/2022]
Abstract
Vibrio harveyi is an important aquatic pathogen that produces several virulence factors. In this study, the effect of quorum sensing, bacterial cell-to-cell communication, on the production of the virulence factors caseinase, gelatinase, lipase, hemolysin, and phospholipase, was investigated. The activity of virulence factors was studied through enzymatic plate assays using V. harveyi wild type and mutants with constitutively maximal or minimal quorum sensing activity. The results showed that quorum sensing negatively regulates phospholipase activity as higher activity was observed in mutants with minimal quorum sensing activity than in the mutant with maximal quorum sensing activity.Reverse transcriptase real-time PCR with specific primers revealed that the expression level of three phospholipase genes was 2-fold higher [corrected] in the mutant with minimal quorum sensing activity than in the mutant with maximal quorum sensingactivity. As far as we know, this is the first report of quorum sensing regulation of phospholipase. Finally, caseinase and gelatinase activity were positively regulated by quorum sensing, which is consistent with previous reports, and lipase and hemolysin activity were found to be independent of quorum sensing. Hence, the regulation is different for different virulence factors, with some being either positively or negatively regulated, and others being independent of quorum sensing. This might reflect the need to produce the different virulence factors at different stages during infection.
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Affiliation(s)
- F M I Natrah
- Laboratory of Aquaculture &Artemia Reference Center, Ghent University, Rozier 44, B-9000 Gent, Belgium
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Natrah FMI, Defoirdt T, Sorgeloos P, Bossier P. Disruption of bacterial cell-to-cell communication by marine organisms and its relevance to aquaculture. MARINE BIOTECHNOLOGY (NEW YORK, N.Y.) 2011; 13:109-126. [PMID: 21246235 DOI: 10.1007/s10126-010-9346-3] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2010] [Accepted: 12/15/2010] [Indexed: 05/30/2023]
Abstract
Bacterial disease is one of the most critical problems in commercial aquaculture. Although various methods and treatments have been developed to curb the problem, yet they still have significant drawbacks. A novel and environmental-friendly approach in solving this problem is through the disruption of bacterial communication or quorum sensing (QS). In this communication scheme, bacteria regulate their own gene expression by producing, releasing, and sensing chemical signals from the environment. There seems to be a link between QS and diseases through the regulation of certain phenotypes and the induction of virulence factors responsible for pathogen-host association. Several findings have reported that numerous aquatic organisms such as micro-algae, macro-algae, invertebrates, or even other bacteria have the potential to disrupt QS. The mechanism of action varies from degradation of signals through enzymatic or chemical inactivation to antagonistic as well as agonistic activities. This review focuses on the existing marine organisms that are able to interfere with QS with potential application for aquaculture as bacterial control.
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Affiliation(s)
- F M I Natrah
- Laboratory of Aquaculture and Artemia Reference Center, Ghent University, Rozier 44, 9000, Ghent, Belgium.
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Abd H, Valeru SP, Sami SM, Saeed A, Raychaudhuri S, Sandström G. Interaction between Vibrio mimicus and Acanthamoeba castellanii. ENVIRONMENTAL MICROBIOLOGY REPORTS 2010; 2:166-171. [PMID: 20454692 PMCID: PMC2861843 DOI: 10.1111/j.1758-2229.2009.00129.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/20/2009] [Accepted: 11/24/2009] [Indexed: 05/29/2023]
Abstract
Vibrio mimicus is a Gram-negative bacterium, which causes gastroenteritis and is closely related to Vibrio cholerae. The environmental reservoir of this bacterium is far from defined. Acanthamoeba as well as Vibrio species are found in diverse aquatic environments. The present study was aimed to investigate the ability of A. castellanii to host V. mimicus, the role of bacterial protease on interaction with A. castellanii and to disclose the ability of cysts to protect intracellular V. mimicus. Co-cultivation, viable counts, gentamicin assay, electron microscopy and statistical analysis showed that co-cultivation of wild type and luxO mutant of V. mimicus strains with A. castellanii did not inhibit growth of the amoeba. On the other hand co-cultivation enhanced growth and survival of V. mimicus strains. Vibrio mimicus showed intracellular behaviour because bacteria were found to be localized in the cytoplasm of amoeba trophozoites and remain viable for 14 days. The cysts protected intracellular V. mimicus from high level of gentamicin. The intracellular growth of V. mimicus in A. castellanii suggests a role of A. castellanii as a host for V. mimicus.
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Affiliation(s)
- Hadi Abd
- Swedish Institute for Infectious Disease Control, Centre for Microbiological PreparednessSE-17182 Solna, Sweden
| | - Soni Priya Valeru
- Swedish Institute for Infectious Disease Control, Centre for Microbiological PreparednessSE-17182 Solna, Sweden
| | - Susan Marouf Sami
- Swedish Institute for Infectious Disease Control, Centre for Microbiological PreparednessSE-17182 Solna, Sweden
| | - Amir Saeed
- Swedish Institute for Infectious Disease Control, Centre for Microbiological PreparednessSE-17182 Solna, Sweden
- Karolinska Institute, Department of Laboratory Medicine, Division of Clinical Microbiology, Karolinska University HospitalHuddinge, SE-141 86 Stockholm, Sweden
| | - Saumya Raychaudhuri
- Institute of Microbial Technology, CSIRSector 39-A, Chandigarh, 160036, India
| | - Gunnar Sandström
- Swedish Institute for Infectious Disease Control, Centre for Microbiological PreparednessSE-17182 Solna, Sweden
- Karolinska Institute, Department of Laboratory Medicine, Division of Clinical Microbiology, Karolinska University HospitalHuddinge, SE-141 86 Stockholm, Sweden
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Wang Q, Liu Q, Ma Y, Rui H, Zhang Y. LuxO controls extracellular protease, haemolytic activities and siderophore production in fish pathogen Vibrio alginolyticus. J Appl Microbiol 2008; 103:1525-34. [PMID: 17953563 DOI: 10.1111/j.1365-2672.2007.03380.x] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
AIMS To characterize the luxO gene in fish pathogen Vibrio alginolyticus MVP01 and investigate its roles in regulation of extracellular products (ECP) and siderophore production. METHODS AND RESULTS The luxO gene was cloned from V. alginolyticus MVP01. Genetic analysis revealed that it encoded a protein with high similarity to other LuxO homologues. The luxO in-frame deletion mutant and rpoN null mutant were constructed with suicide plasmids. We demonstrated that sole deletion in LuxO increased the secretion of extracellular protease and haemolytic products, but decreased siderophore production for V. alginolyticus MVP01. Mutants with null rpoN displayed significantly enhanced protease level and siderophore production while notable reduction in haemolytic activities of ECP. CONCLUSIONS Vibrio alginolyticus harbours functional luxO gene that regulates the secretion of extracellular protease and haemolytic materials as well as siderophore production in either sigma(54) dependent or independent manners. SIGNIFICANCE AND IMPACT OF THE STUDY The current study demonstrated that V. alginolyticus MVP01 produces extracellular protease and haemolytic activity material as well as siderophore, which may be characteristics of the virulence of the strain. Revelations that secretion of these products is under the regulation of LuxO and sigma(54) as well as the potential quorum sensing systems in V. alginolyticus MVP01 will expedite the understanding of vibriosis pathogenesis.
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Affiliation(s)
- Q Wang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, People's Republic of China
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