1
|
Mekasha S, Linke D. Secretion Systems in Gram-Negative Bacterial Fish Pathogens. Front Microbiol 2022; 12:782673. [PMID: 34975803 PMCID: PMC8714846 DOI: 10.3389/fmicb.2021.782673] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Accepted: 11/24/2021] [Indexed: 12/17/2022] Open
Abstract
Bacterial fish pathogens are one of the key challenges in the aquaculture industry, one of the fast-growing industries worldwide. These pathogens rely on arsenal of virulence factors such as toxins, adhesins, effectors and enzymes to promote colonization and infection. Translocation of virulence factors across the membrane to either the extracellular environment or directly into the host cells is performed by single or multiple dedicated secretion systems. These secretion systems are often key to the infection process. They can range from simple single-protein systems to complex injection needles made from dozens of subunits. Here, we review the different types of secretion systems in Gram-negative bacterial fish pathogens and describe their putative roles in pathogenicity. We find that the available information is fragmented and often descriptive, and hope that our overview will help researchers to more systematically learn from the similarities and differences between the virulence factors and secretion systems of the fish-pathogenic species described here.
Collapse
Affiliation(s)
- Sophanit Mekasha
- Section for Genetics and Evolutionary Biology, Department of Biosciences, University of Oslo, Oslo, Norway
| | - Dirk Linke
- Section for Genetics and Evolutionary Biology, Department of Biosciences, University of Oslo, Oslo, Norway
| |
Collapse
|
2
|
Wang Y, Wang X, Ali F, Li Z, Fu Y, Yang X, Lin W, Lin X. Comparative Extracellular Proteomics of Aeromonas hydrophila Reveals Iron-Regulated Secreted Proteins as Potential Vaccine Candidates. Front Immunol 2019; 10:256. [PMID: 30833947 PMCID: PMC6387970 DOI: 10.3389/fimmu.2019.00256] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Accepted: 01/29/2019] [Indexed: 01/07/2023] Open
Abstract
In our previous study, several iron-related outer membrane proteins in Aeromonas hydrophila, a serious pathogen of farmed fish, conferred high immunoprotectivity to fish, and were proposed as potential vaccine candidates. However, the protective efficacy of these extracellular proteins against A. hydrophila remains largely unknown. Here, we identified secreted proteins that were differentially expressed in A. hydrophila LP-2 in response to iron starvation using an iTRAQ-based quantitative proteomics method. We identified 341 proteins, of which 9 were upregulated in response to iron starvation and 24 were downregulated. Many of the differently expressed proteins were associated with protease activity. We confirmed our proteomics results with Western blotting and qPCR. We constructed three mutants by knocking out three genes encoding differentially expressed proteins (Δorf01830, Δorf01609, and Δorf03641). The physiological characteristics of these mutants were investigated. In all these mutant strains, protease activity decreased, and Δorf01609, and Δorf01830 were less virulent in zebrafish. This indicated that the proteins encoded by these genes may play important roles in bacterial infection. We next evaluated the immune response provoked by the six iron-related recombinant proteins (ORF01609, ORF01830, ORF01839, ORF02943, ORF03355, and ORF03641) in zebrafish as well as the immunization efficacy of these proteins. Immunization with these proteins significantly increased the zebrafish immune response. In addition, the relative percent survival (RPS) of the immunized zebrafish was 50-80% when challenged with three virulent A. hydrophila strains, respectively. Thus, these extracellular secreted proteins might be effective vaccine candidates against A. hydrophila infection in fish.
Collapse
Affiliation(s)
- Yuqian Wang
- Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Xiaoyun Wang
- Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China.,Key Laboratory of Crop Ecology and Molecular Physiology, Fujian Agriculture and Forestry University, Fujian Province University, Fuzhou, China
| | - Farman Ali
- Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China.,Key Laboratory of Crop Ecology and Molecular Physiology, Fujian Agriculture and Forestry University, Fujian Province University, Fuzhou, China
| | - Zeqi Li
- Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China.,Key Laboratory of Crop Ecology and Molecular Physiology, Fujian Agriculture and Forestry University, Fujian Province University, Fuzhou, China
| | - Yuying Fu
- Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China.,Key Laboratory of Crop Ecology and Molecular Physiology, Fujian Agriculture and Forestry University, Fujian Province University, Fuzhou, China
| | - Xiaojun Yang
- Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China.,Key Laboratory of Crop Ecology and Molecular Physiology, Fujian Agriculture and Forestry University, Fujian Province University, Fuzhou, China
| | - Wenxiong Lin
- Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China.,Key Laboratory of Crop Ecology and Molecular Physiology, Fujian Agriculture and Forestry University, Fujian Province University, Fuzhou, China
| | - Xiangmin Lin
- Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China.,Key Laboratory of Crop Ecology and Molecular Physiology, Fujian Agriculture and Forestry University, Fujian Province University, Fuzhou, China
| |
Collapse
|
3
|
The Probiotic Bacterium Phaeobacter inhibens Downregulates Virulence Factor Transcription in the Shellfish Pathogen Vibrio coralliilyticus by N-Acyl Homoserine Lactone Production. Appl Environ Microbiol 2019; 85:AEM.01545-18. [PMID: 30389771 DOI: 10.1128/aem.01545-18] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2018] [Accepted: 10/30/2018] [Indexed: 01/25/2023] Open
Abstract
Phaeobacter inhibens S4Sm acts as a probiotic bacterium against the oyster pathogen Vibrio coralliilyticus Here, we report that P. inhibens S4Sm secretes three molecules that downregulate the transcription of major virulence factors, metalloprotease genes, in V. coralliilyticus cultures. The effects of the S4Sm culture supernatant on the transcription of three genes involved in protease activity, namely, vcpA, vcpB, and vcpR (encoding metalloproteases A and B and their transcriptional regulator, respectively), were examined by reverse transcriptase quantitative PCR (qRT-PCR). The expression of vcpB and vcpR were reduced to 36% and 6.6%, respectively, compared to that in an untreated control. We constructed a V. coralliilyticus green fluorescent protein (GFP) reporter strain to detect the activity of inhibitory compounds. Using a bioassay-guided approach, the molecules responsible for V. coralliilyticus protease inhibition activity were isolated from S4Sm supernatant and identified as three N-acyl homoserine lactones (AHLs). The three AHLs are N-(3-hydroxydecanoyl)-l-homoserine lactone, N-(dodecanoyl-2,5-diene)-l-homoserine lactone, and N-(3-hydroxytetradecanoyl-7-ene)-l-homoserine lactone, and their half maximal inhibitory concentrations (IC50s) against V. coralliilyticus protease activity were 0.26 μM, 3.7 μM, and 2.9 μM, respectively. Our qRT-PCR data demonstrated that exposures to the individual AHLs reduced the transcription of vcpR and vcpB Combinations of the three AHLs (any two or all three AHLs) on V. coralliilyticus produced additive effects on protease inhibition activity. These AHL compounds may contribute to the host protective effects of S4Sm by disrupting the quorum sensing pathway that activates protease transcription of V. coralliilyticus IMPORTANCE Probiotics represent a promising alternative strategy to control infection and disease caused by marine pathogens of aquaculturally important species. Generally, the beneficial effects of probiotics include improved water quality, control of pathogenic bacteria and their virulence, stimulation of the immune system, and improved animal growth. Previously, we isolated a probiotic bacterium, Phaeobacter inhibens S4Sm, which protects oyster larvae from Vibrio coralliilyticus RE22Sm infection. We also demonstrated that both antibiotic secretion and biofilm formation play important roles in S4Sm probiotic activity. Here, we report that P. inhibens S4Sm, an alphaproteobacterium and member of the Roseobacter clade, also secretes secondary metabolites that hijack the quorum sensing ability of V. coralliilyticus RE22Sm, suppressing virulence gene expression. This finding demonstrates that probiotic bacteria can exert their host protection by using a multipronged array of behaviors that limit the ability of pathogens to become established and cause infection.
Collapse
|
4
|
Li P, Zang K, Li Y, Liu C, Ma Q. Structural basis for specific calcium binding by the polycystic-kidney-disease domain of Vibrio anguillarum protease Epp. Biochem Biophys Res Commun 2018; 505:471-477. [PMID: 30268503 DOI: 10.1016/j.bbrc.2018.09.108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2018] [Accepted: 09/17/2018] [Indexed: 10/28/2022]
Abstract
Extracellular proteases are often produced as pre-pro-enzyme and then undergo multiple processing steps to mature into the active form. The protease Epp, a virulent factor of Vibrio anguillarum, belongs to this family. Its maturation might be regulated by Ca2+ via its polycystic kidney disease (PKD) domain, but the molecular mechanism is unknown. Herein, we report the crystal structure of the first PKD domain from V. anguillarum Epp (Epp-PKD1) and its specific Ca2+-binding capacity. Epp-PKD1 exists as a monomer, consisting of seven β-strands which form two β-sheets stacking with each other. One Ca2+ is bound by the residues Asn3, Gln4, Asp27, Asp29, Asp68 and a water molecule with a pentagonal bipyramidal geometry. Incubating the apo Epp-PKD1 with Ca2+ but not Mg2+, Mn2+, or Zn2+, enhances the thermal and chemical stability of Epp-PKD1, indicating its specific binding to Ca2+. Epp-PKD1 shares high similarity in both sequence and overall structure with that of Vibrio cholerae PrtV, a homologous protease of Epp, however, they differ in the oligomeric state and local structure at the Ca2+-binding site, suggesting maturation of PrtV and Epp might be differently regulated by Ca2+. Likely, proteases may take advantage of the structural diversity in PKD domains to tune their Ca2+-regulated maturation process.
Collapse
Affiliation(s)
- Peihai Li
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; University of Chinese Academy of Sciences, Beijing, China
| | - Kun Zang
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; University of Chinese Academy of Sciences, Beijing, China
| | - Yingjie Li
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| | - Changshui Liu
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| | - Qingjun Ma
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, China.
| |
Collapse
|
5
|
Mou X, Spinard EJ, Hillman SL, Nelson DR. Isocitrate dehydrogenase mutation in Vibrio anguillarum results in virulence attenuation and immunoprotection in rainbow trout (Oncorhynchus mykiss). BMC Microbiol 2017; 17:217. [PMID: 29137620 PMCID: PMC5686843 DOI: 10.1186/s12866-017-1124-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Accepted: 11/02/2017] [Indexed: 11/28/2022] Open
Abstract
Background Vibrio anguillarum is an extracellular bacterial pathogen that is a causative agent of vibriosis in finfish and crustaceans with mortality rates ranging from 30% to 100%. Mutations in central metabolism (glycolysis and the TCA cycle) of intracellular pathogens often result in attenuated virulence due to depletion of required metabolic intermediates; however, it was not known whether mutations in central metabolism would affect virulence in an extracellular pathogen such as V. anguillarum. Results Seven central metabolism mutants were created and characterized with regard to growth in minimal and complex media, expression of virulence genes, and virulence in juvenile rainbow trout (Oncorhynchus mykiss). Only the isocitrate dehydrogenase (icd) mutant was attenuated in virulence against rainbow trout challenged by either intraperitoneal injection or immersion. Further, the icd mutant was shown to be immunoprotective against wild type V. anguillarum infection. There was no significant decrease in the expression of the three hemolysin genes detected by qRT-PCR. Additionally, only the icd mutant exhibited a significantly decreased growth yield in complex media. Growth yield was directly related to the abundance of glutamate. A strain with a restored wild type icd gene was created and shown to restore growth to a wild type cell density in complex media and pathogenicity in rainbow trout. Conclusions The data strongly suggest that a decreased growth yield, resulting from the inability to synthesize α-ketoglutarate, caused the attenuation despite normal levels of expression of virulence genes. Therefore, the ability of an extracellular pathogen to cause disease is dependent upon the availability of host-supplied nutrients for growth. Additionally, a live vaccine strain could be created from an icd deletion strain. Electronic supplementary material The online version of this article (10.1186/s12866-017-1124-1) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Xiangyu Mou
- Department of Cell and Molecular Biology, University of Rhode Island, Kingston, RI, 02881, USA.,Present Address: Division of Infectious Diseases, Massachusetts General Hospital, 65 Landsdowne St, Cambridge, MA, 02139, USA
| | - Edward J Spinard
- Department of Cell and Molecular Biology, University of Rhode Island, Kingston, RI, 02881, USA
| | - Shelby L Hillman
- Department of Cell and Molecular Biology, University of Rhode Island, Kingston, RI, 02881, USA
| | - David R Nelson
- Department of Cell and Molecular Biology, University of Rhode Island, Kingston, RI, 02881, USA.
| |
Collapse
|
6
|
Li Y, Ma Q. Iron Acquisition Strategies of Vibrio anguillarum. Front Cell Infect Microbiol 2017; 7:342. [PMID: 28791260 PMCID: PMC5524678 DOI: 10.3389/fcimb.2017.00342] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Accepted: 07/11/2017] [Indexed: 12/03/2022] Open
Abstract
The hemorrhagic septicemic disease vibriosis caused by Vibrio anguillarum shows noticeable similarities to invasive septicemia in humans, and in this case, the V. anguillarum–host system has the potential to serve as a model for understanding native eukaryotic host–pathogen interactions. Iron acquisition, as a fierce battle occurring between pathogenic V. anguillarum and the fish host, is a pivotal step for virulence. In this article, advances in defining the roles of iron uptake pathways in growth and virulence of V. anguillarum have been summarized, divided into five aspects, including siderophore biosynthesis and secretion, iron uptake, iron release, and regulation of iron uptake. Understanding the molecular mechanisms of iron acquisition will have important implications for the pathogenicity of this organism.
Collapse
Affiliation(s)
- Yingjie Li
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of SciencesQingdao, China.,Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and TechnologyQingdao, China
| | - Qingjun Ma
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of SciencesQingdao, China.,Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and TechnologyQingdao, China
| |
Collapse
|
7
|
Draft Genome Sequence of the Emerging Bivalve Pathogen Vibrio tubiashii subsp. europaeus. GENOME ANNOUNCEMENTS 2016; 4:4/4/e00625-16. [PMID: 27469949 PMCID: PMC4966453 DOI: 10.1128/genomea.00625-16] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
Vibrio tubiashii subsp. europaeus is a bivalve pathogen isolated during episodes of mortality affecting larval cultures in different shellfish hatcheries. Here, we announce the draft genome sequence of the type strain PP-638 and describe potential virulence factors, which may provide insight into the mechanism of pathogenicity.
Collapse
|
8
|
Hatzios SK, Abel S, Martell J, Hubbard T, Sasabe J, Munera D, Clark L, Bachovchin DA, Qadri F, Ryan ET, Davis BM, Weerapana E, Waldor MK. Chemoproteomic profiling of host and pathogen enzymes active in cholera. Nat Chem Biol 2016; 12:268-274. [PMID: 26900865 PMCID: PMC4765928 DOI: 10.1038/nchembio.2025] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Accepted: 12/31/2015] [Indexed: 12/15/2022]
Abstract
Activity-based protein profiling (ABPP) is a chemoproteomic tool for detecting active enzymes in complex biological systems. We used ABPP to identify secreted bacterial and host serine hydrolases that are active in animals infected with the cholera pathogen Vibrio cholerae. Four V. cholerae proteases were consistently active in infected rabbits, and one, VC0157 (renamed IvaP), was also active in human choleric stool. Inactivation of IvaP influenced the activity of other secreted V. cholerae and rabbit enzymes in vivo, and genetic disruption of all four proteases increased the abundance of intelectin, an intestinal lectin, and its binding to V. cholerae in infected rabbits. Intelectin also bound to other enteric bacterial pathogens, suggesting that it may constitute a previously unrecognized mechanism of bacterial surveillance in the intestine that is inhibited by pathogen-secreted proteases. Our work demonstrates the power of activity-based proteomics to reveal host-pathogen enzymatic dialog in an animal model of infection.
Collapse
Affiliation(s)
- Stavroula K. Hatzios
- Division of Infectious Diseases, Brigham and Women's Hospital, Boston, MA, USA
- Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA, USA
- Howard Hughes Medical Institute, Boston, MA, USA
| | - Sören Abel
- Division of Infectious Diseases, Brigham and Women's Hospital, Boston, MA, USA
- Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA, USA
- Department of Pharmacy, University of Tromsø (UiT), The Arctic University of Norway, Tromsø, Norway
| | | | - Troy Hubbard
- Division of Infectious Diseases, Brigham and Women's Hospital, Boston, MA, USA
- Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA, USA
- Howard Hughes Medical Institute, Boston, MA, USA
| | - Jumpei Sasabe
- Division of Infectious Diseases, Brigham and Women's Hospital, Boston, MA, USA
- Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA, USA
- Howard Hughes Medical Institute, Boston, MA, USA
| | - Diana Munera
- Division of Infectious Diseases, Brigham and Women's Hospital, Boston, MA, USA
- Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA, USA
- Howard Hughes Medical Institute, Boston, MA, USA
| | - Lars Clark
- Division of Infectious Diseases, Brigham and Women's Hospital, Boston, MA, USA
- Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA, USA
- Howard Hughes Medical Institute, Boston, MA, USA
| | | | - Firdausi Qadri
- International Centre for Diarrhoeal Disease Research, Bangladesh (ICDDR,B), Dhaka, Bangladesh
| | - Edward T. Ryan
- Division of Infectious Diseases, Massachusetts General Hospital, Boston, MA, USA
- Department of Medicine, Harvard Medical School, Boston, MA, USA
| | - Brigid M. Davis
- Division of Infectious Diseases, Brigham and Women's Hospital, Boston, MA, USA
- Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA, USA
- Howard Hughes Medical Institute, Boston, MA, USA
| | | | - Matthew K. Waldor
- Division of Infectious Diseases, Brigham and Women's Hospital, Boston, MA, USA
- Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA, USA
- Howard Hughes Medical Institute, Boston, MA, USA
| |
Collapse
|
9
|
Zhao W, Dao C, Karim M, Gomez-Chiarri M, Rowley D, Nelson DR. Contributions of tropodithietic acid and biofilm formation to the probiotic activity of Phaeobacter inhibens. BMC Microbiol 2016; 16:1. [PMID: 26728027 PMCID: PMC4700733 DOI: 10.1186/s12866-015-0617-z] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2015] [Accepted: 12/22/2015] [Indexed: 11/30/2022] Open
Abstract
Background The probiotic bacterium Phaeobacter inhibens strain S4Sm, isolated from the inner shell surface of a healthy oyster, secretes the antibiotic tropodithietic acid (TDA), is an excellent biofilm former, and increases oyster larvae survival when challenged with bacterial pathogens. In this study, we investigated the specific roles of TDA secretion and biofilm formation in the probiotic activity of S4Sm. Results Mutations in clpX (ATP-dependent ATPase) and exoP (an exopolysaccharide biosynthesis gene) were created by insertional mutagenesis using homologous recombination. Mutation of clpX resulted in the loss of TDA production, no decline in biofilm formation, and loss of the ability to inhibit the growth of Vibrio tubiashii and Vibrio anguillarum in co-colonization experiments. Mutation of exoP resulted in a ~60 % decline in biofilm formation, no decline in TDA production, and delayed inhibitory activity towards Vibrio pathogens in co-colonization experiments. Both clpX and exoP mutants exhibited reduced ability to protect oyster larvae from death when challenged by Vibrio tubiashii. Complementation of the clpX and exoP mutations restored the wild type phenotype. We also found that pre-colonization of surfaces by S4Sm was critical for this bacterium to inhibit pathogen colonization and growth. Conclusions Our observations demonstrate that probiotic activity by P. inhibens S4Sm involves contributions from both biofilm formation and the production of the antibiotic TDA. Further, probiotic activity also requires colonization of surfaces by S4Sm prior to the introduction of the pathogen. Electronic supplementary material The online version of this article (doi:10.1186/s12866-015-0617-z) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Wenjing Zhao
- Department of Cell and Molecular Biology, University of Rhode Island, 120 Flagg Rd., Kingston, RI, 02881, USA. .,Present Address: Department of Microbiology and Immunology, Harvard Medical School, Boston, MA 02115, USA.
| | - Christine Dao
- Biomedical and Pharmaceutical Sciences, University of Rhode Island, Kingston, RI, 02881, USA. .,Present Address: Department of Chemistry and Biochemistry, University of Massachusetts Dartmouth, Darmouth, MA 02747, USA.
| | - Murni Karim
- Fisheries, Animal and Veterinary Sciences, University of Rhode Island, Kingston, RI, 02881, USA. .,Present Address: Department of Aquaculture, Faculty of Agriculture, Universiti Putra Malaysia, 43400, Serdang, Selangor, Malaysia.
| | - Marta Gomez-Chiarri
- Fisheries, Animal and Veterinary Sciences, University of Rhode Island, Kingston, RI, 02881, USA.
| | - David Rowley
- Biomedical and Pharmaceutical Sciences, University of Rhode Island, Kingston, RI, 02881, USA.
| | - David R Nelson
- Department of Cell and Molecular Biology, University of Rhode Island, 120 Flagg Rd., Kingston, RI, 02881, USA.
| |
Collapse
|
10
|
Dubert J, Nelson DR, Spinard EJ, Kessner L, Gomez-Chiarri M, Costa FD, Prado S, Barja JL. Following the infection process of vibriosis in Manila clam (Ruditapes philippinarum) larvae through GFP-tagged pathogenic Vibrio species. J Invertebr Pathol 2016; 133:27-33. [DOI: 10.1016/j.jip.2015.11.008] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Revised: 11/17/2015] [Accepted: 11/18/2015] [Indexed: 11/26/2022]
|
11
|
Draft Genome Sequence of the Marine Pathogen Vibrio coralliilyticus RE22. GENOME ANNOUNCEMENTS 2015; 3:3/6/e01432-15. [PMID: 26634766 PMCID: PMC4669407 DOI: 10.1128/genomea.01432-15] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Vibrio coralliilyticus RE22 is a causative agent of vibriosis in larval bivalves. We report here the draft genome sequence of V. coralliilyticus RE22 and describe additional virulence factors that may provide insight into its mechanism of pathogenicity.
Collapse
|
12
|
Crisafi F, Denaro R, Yakimov M, Felice M, Giuliano L, Genovese L. NaCl concentration in the medium modulates the secretion of active EmpA protease in Vibrio anguillarum
at post-transcriptional level. J Appl Microbiol 2015; 119:1494-501. [DOI: 10.1111/jam.12957] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Revised: 08/03/2015] [Accepted: 09/01/2015] [Indexed: 01/09/2023]
Affiliation(s)
- F. Crisafi
- Institute for Coastal Marine Environment CNR; Messina Italy
| | - R. Denaro
- Institute for Coastal Marine Environment CNR; Messina Italy
| | - M. Yakimov
- Institute for Coastal Marine Environment CNR; Messina Italy
| | - M.R. Felice
- Department of Biological and Environmental Sciences; University of Messina; Messina Italy
| | - L. Giuliano
- Institute for Coastal Marine Environment CNR; Messina Italy
| | - L. Genovese
- Institute for Coastal Marine Environment CNR; Messina Italy
| |
Collapse
|
13
|
Madec S, Pichereau V, Jacq A, Paillard M, Boisset C, Guérard F, Paillard C, Nicolas JL. Characterization of the secretomes of two vibrios pathogenic to mollusks. PLoS One 2014; 9:e113097. [PMID: 25401495 PMCID: PMC4234667 DOI: 10.1371/journal.pone.0113097] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Accepted: 10/19/2014] [Indexed: 02/05/2023] Open
Abstract
Vibrio tapetis causes the brown ring disease in the Japanese clam Ruditapes philippinarum while Vibrio aestuarianus is associated with massive oyster mortalities. As extracellular proteins are often associated with the virulence of pathogenic bacteria, we undertook a proteomic approach to characterize the secretomes of both vibrios. The extracellular proteins (ECPs) of both species were fractionated by SEC-FPLC and in vitro assays were performed to measure the effects of each fraction on hemocyte cellular parameters (phagocytosis and adhesion). Fractions showing a significant effect were subjected to SDS-PAGE, and proteins were identified by nano LC-MS/MS. 45 proteins were identified for V. aestuarianus and 87 for V. tapetis. Most of them belonged to outer membrane or were periplasmic, including porins or adhesins that were already described as virulence factors in other bacterial species. Others were transporter components, flagella proteins, or proteins of unknown function (14 and 15 respectively). Interestingly, for V. aestuarianus, we noted the secretion of 3 extracellular enzymes including the Vam metalloprotease and two other enzymes (one putative lipase and one protease). For V. tapetis, we identified five extracellular enymes, i.e. two different endochitinases, one protease, one lipase and an adhesin. A comparison of both secretomes also showed that only the putative extracellular lipase was common to both secretomes, underscoring the difference in pathogenicity mechanisms between these two species. Overall, these results characterize for the first time the secretomes of these two marine pathogenic vibrios and constitute a useful working basis to further analyze the contribution of specific proteins in the virulence mechanisms of these species.
Collapse
Affiliation(s)
- Stéphanie Madec
- Laboratoire Universitaire de Biodiversité et Ecologie Microbienne (EA3882), SFR48 ScInBios, Université de Bretagne Occidentale (UBO), UEB, ESIAB, Technopôle Brest Iroise, 29280, Plouzané, France
| | - Vianney Pichereau
- Laboratoire des Sciences de l’Environnement Marin, UMR 6539 UBO/CNRS/IRD/Ifremer, Université de Bretagne Occidentale (UBO), Institut Universitaire Européen de la Mer, Technopôle Brest Iroise, 29280, Plouzané, France
| | - Annick Jacq
- Institut de Génétique et de Microbiologie, UMR8621, CNRS-Université Paris-Sud, 91405, Orsay, France
| | - Mathieu Paillard
- Laboratoire des Sciences de l’Environnement Marin, UMR 6539 UBO/CNRS/IRD/Ifremer, Université de Bretagne Occidentale (UBO), Institut Universitaire Européen de la Mer, Technopôle Brest Iroise, 29280, Plouzané, France
| | - Claire Boisset
- Centre de Recherche sur les macromolécules végétales, CERMAV-CNRS, BP53, 38041 Grenoble, France
| | - Fabienne Guérard
- Laboratoire des Sciences de l’Environnement Marin, UMR 6539 UBO/CNRS/IRD/Ifremer, Université de Bretagne Occidentale (UBO), Institut Universitaire Européen de la Mer, Technopôle Brest Iroise, 29280, Plouzané, France
| | - Christine Paillard
- Laboratoire des Sciences de l’Environnement Marin, UMR 6539 UBO/CNRS/IRD/Ifremer, Université de Bretagne Occidentale (UBO), Institut Universitaire Européen de la Mer, Technopôle Brest Iroise, 29280, Plouzané, France
| | - Jean-Louis Nicolas
- Laboratoire des Sciences de l’Environnement Marin, UMR 6539 UBO/CNRS/IRD/Ifremer, Université de Bretagne Occidentale (UBO), Institut Universitaire Européen de la Mer, Technopôle Brest Iroise, 29280, Plouzané, France
| |
Collapse
|
14
|
Li L, Mou X, Nelson DR. Characterization of Plp, a phosphatidylcholine-specific phospholipase and hemolysin of Vibrio anguillarum. BMC Microbiol 2013; 13:271. [PMID: 24279474 PMCID: PMC4222444 DOI: 10.1186/1471-2180-13-271] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2013] [Accepted: 11/20/2013] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Vibrio anguillarum is the causative agent of vibriosis in fish. Several extracellular proteins secreted by V. anguillarum have been shown to contribute to virulence. While two hemolysin gene clusters, vah1-plp and rtxACHBDE, have been previously identified and described, the activities of the protein encoded by the plp gene were not known. Here we describe the biochemical activities of the plp-encoded protein and its role in pathogenesis. RESULTS The plp gene, one of the components in vah1 cluster, encodes a 416-amino-acid protein (Plp), which has homology to lipolytic enzymes containing the catalytic site amino acid signature SGNH. Hemolytic activity of the plp mutant increased 2-3-fold on sheep blood agar indicating that plp represses vah1; however, hemolytic activity of the plp mutant decreased by 2-3-fold on fish blood agar suggesting that Plp has different effects against erythrocytes from different species. His6-tagged recombinant Plp protein (rPlp) was over-expressed in E. coli. Purified and re-folded active rPlp exhibited phospholipase A2 activity against phosphatidylcholine and no activity against phosphatidylserine, phosphatidylethanolamine, or sphingomyelin. Characterization of rPlp revealed broad optimal activities at pH 5-9 and at temperatures of 30-64°C. Divalent cations and metal chelators did not affect activity of rPlp. We also demonstrated that Plp was secreted using thin layer chromatography and immunoblot analysis. Additionally, rPlp had strong hemolytic activity towards rainbow trout erythrocytes, but not to sheep erythrocytes suggesting that rPlp is optimized for lysis of phosphatidylcholine-rich fish erythrocytes. Further, only the loss of the plp gene had a significant effect on hemolytic activity of culture supernatant on fish erythrocytes, while the loss of rtxA and/or vah1 had little effect. However, V. anguillarum strains with mutations in plp or in plp and vah1 exhibited no significant reduction in virulence compared to the wild type strain when used to infect rainbow trout. CONCLUSION The plp gene of V. anguillarum encoding a phospholipase with A2 activity is specific for phosphatidylcholine and, therefore, able to lyse fish erythrocytes, but not sheep erythrocytes. Mutation of plp does not affect the virulence of V. anguillarum in rainbow trout.
Collapse
Affiliation(s)
- Ling Li
- Department of Cell and Molecular Biology, University of Rhode Island, 120 Flagg Rd,, Kingston, RI 02881, USA.
| | | | | |
Collapse
|
15
|
Genomic and proteomic analyses of the coral pathogen Vibrio coralliilyticus reveal a diverse virulence repertoire. ISME JOURNAL 2011; 5:1471-83. [PMID: 21451583 DOI: 10.1038/ismej.2011.19] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Vibrio coralliilyticus has been implicated as an important pathogen of coral species worldwide. In this study, the nearly complete genome of Vibrio coralliilyticus strain P1 (LMG23696) was sequenced and proteases implicated in virulence of the strain were specifically investigated. The genome sequence of P1 (5,513,256 bp in size) consisted of 5222 coding sequences and 58 RNA genes (53 tRNAs and at least 5 rRNAs). Seventeen metalloprotease and effector (vgrG, hlyA and hcp) genes were identified in the genome and expressed proteases were also detected in the secretome of P1. As the VcpA zinc-metalloprotease has been considered an important virulence factor of V. coralliilyticus, a vcpA deletion mutant was constructed to evaluate the effect of this gene in animal pathogenesis. Both wild-type and mutant (ΔvcpA) strains exhibited similar virulence characteristics that resulted in high mortality in Artemia and Drosophila pathogenicity bioassays and strong photosystem II inactivation of the coral dinoflagellate endosymbiont (Symbiodinium). In contrast, the ΔvcpA mutant demonstrated higher hemolytic activity and secreted 18 proteins not secreted by the wild type. These proteins included four types of metalloproteases, a chitinase, a hemolysin-related protein RbmC, the Hcp protein and 12 hypothetical proteins. Overall, the results of this study indicate that V. coralliilyticus strain P1 has a diverse virulence repertoire that possibly enables this bacterium to be an efficient animal pathogen.
Collapse
|
16
|
Naka H, Crosa JH. Genetic Determinants of Virulence in the Marine Fish Pathogen Vibrio anguillarum. FISH PATHOLOGY 2011; 46:1-10. [PMID: 21625345 PMCID: PMC3103123 DOI: 10.3147/jsfp.46.1] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
One of the most studied fish pathogens is Vibrio anguillarum. Development of the genetics and biochemistry of the mechanisms of virulence in this fish pathogen together with clinical and ecologic studies has permitted the intensive development of microbiology in fish diseases. It is the intention of this review to compile the exhaustive knowledge accumulated on this bacterium and its interaction with the host fish by reporting a complete analysis of the V. anguillarum virulence factors and the genetics of their complexity.
Collapse
|
17
|
Li N, Zhang J, Zhang LQ, Nie P. Difference in genes between a high virulence strain G(4) and a low virulence strain G(18) of Flavobacterium columnare by using suppression subtractive hybridization. JOURNAL OF FISH DISEASES 2010; 33:403-412. [PMID: 20102440 DOI: 10.1111/j.1365-2761.2009.01132.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Flavobacterium columnare is the causative agent of columnaris disease. Different genetic groups of F. columnare show to some extent different degrees of virulence. To identify genetic differences between the high virulence strain G(4) and the low virulence strain G(18) of F. columnare, suppression subtractive hybridization was used. A total of 46 genes were identified from the virulent strain G(4), 35 of which showed some degree of homology with known proteins and can be classified into 11 categories: DNA replication or recombination proteins, inorganic ion transport proteins, outer membrane proteins, enterotoxin, binding proteins, YD repeat proteins, transposase, chaperon, signal transduction-related proteins, regulatory proteins, metabolism-related proteins. Several putative virulence factors identified in other bacteria could also be identified in the virulent strain G(4), such as ferrous iron transport protein, TonB-dependent receptor, transposases, as well as ABC transporter permease protein. The flanking region of a putative transposase ISFclI was analysed, and a putative Rhs element was located at the downstream of the putative transposase. The analysis of isfclI gene in 24 strains of F. columnare isolated in China revealed that 11 strains have isfclI, and all the strains from Zhaoqing, Anhui and Qingjiang have isfclI.
Collapse
Affiliation(s)
- N Li
- State Key Laboratory of Freshwater Ecology and Biotechnology, and Laboratory of Fish Diseases, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei Province, China
| | | | | | | |
Collapse
|
18
|
Sussman M, Mieog JC, Doyle J, Victor S, Willis BL, Bourne DG. Vibrio zinc-metalloprotease causes photoinactivation of coral endosymbionts and coral tissue lesions. PLoS One 2009; 4:e4511. [PMID: 19225559 PMCID: PMC2637982 DOI: 10.1371/journal.pone.0004511] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2008] [Accepted: 01/01/2009] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Coral diseases are emerging as a serious threat to coral reefs worldwide. Of nine coral infectious diseases, whose pathogens have been characterized, six are caused by agents from the family Vibrionacae, raising questions as to their origin and role in coral disease aetiology. METHODOLOGY/PRINCIPAL FINDINGS Here we report on a Vibrio zinc-metalloprotease causing rapid photoinactivation of susceptible Symbiodinium endosymbionts followed by lesions in coral tissue. Symbiodinium photosystem II inactivation was diagnosed by an imaging pulse amplitude modulation fluorometer in two bioassays, performed by exposing Symbiodinium cells and coral juveniles to non-inhibited and EDTA-inhibited supernatants derived from coral white syndrome pathogens. CONCLUSION/SIGNIFICANCE These findings demonstrate a common virulence factor from four phylogenetically related coral pathogens, suggesting that zinc-metalloproteases may play an important role in Vibrio pathogenicity in scleractinian corals.
Collapse
Affiliation(s)
- Meir Sussman
- ARC Centre of Excellence for Coral Reef Studies, and School of Marine and Tropical Biology, James Cook University, Townsville, Queensland, Australia.
| | | | | | | | | | | |
Collapse
|