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Pozo F, Borbor M, Solórzano R, Sonnenholzner S, Bayot B. Optimized swarming motility assay to identify anti-virulence products against Vibrio parahaemolyticus, a pathogen of farmed shrimp. MethodsX 2024; 12:102622. [PMID: 38425495 PMCID: PMC10904179 DOI: 10.1016/j.mex.2024.102622] [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] [Received: 10/13/2023] [Accepted: 02/19/2024] [Indexed: 03/02/2024] Open
Abstract
Swarming motility is a type of movement used by pathogenic flagellated bacteria as virulence factor to colonize surfaces and cause damage to the host. Vibrio parahaemolyticus is a pathogenic flagellated bacterium that increases its virulence by switching from swimmer to swarming cells. The hosts of pathogenic V. parahaemolyticus include farmed shrimp. Therefore, methods to detect and quantify this movement are important to control shrimp diseases caused by pathogenic V. parahaemolyticus strains. We developed an optimized swarming motility assay by identifying the most optimal type of agar, and drying time of the culture medium, agar concentration and volume of the bacterial culture to achieve the fastest swarming motility during the migration of V. parahaemolyticus on Petri dishes during a 24-hour incubation period. The method includes data analysis that could be used as a tool to identify potential anti-virulence products by comparing the slopes of the linearized diameters of the swarming halos of bacteria treated with the products, as they migrate on Petri dishes over a 24-hour incubation period. Here we report:•A simple method for detection and quantification of swarming motility halos of V. parahaemolyticus bacteria.•A method that could be used as a tool to identify potential anti-virulence products.
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Affiliation(s)
- Francisco Pozo
- Escuela Superior Politécnica del Litoral, ESPOL, Facultad de Ciencias de la Vida, FCV, Campus Gustavo Galindo Km 30.5 Vía Perimetral, Guayaquil P.O. Box 09-01-5863, Ecuador
- Pontificia Universidad Católica del Ecuador, Sede Manabí, Portoviejo, Ecuador
| | - Martha Borbor
- Escuela Superior Politécnica del Litoral, ESPOL, Centro Nacional de Acuicultura e Investigaciones Marinas, CENAIM, Campus Gustavo Galindo Km 30.5 Vía Perimetral, Guayaquil P.O. Box 09-01-5863, Ecuador
| | - Ramiro Solórzano
- Escuela Superior Politécnica del Litoral, ESPOL, Centro Nacional de Acuicultura e Investigaciones Marinas, CENAIM, Campus Gustavo Galindo Km 30.5 Vía Perimetral, Guayaquil P.O. Box 09-01-5863, Ecuador
| | - Stanislaus Sonnenholzner
- Escuela Superior Politécnica del Litoral, ESPOL, Centro Nacional de Acuicultura e Investigaciones Marinas, CENAIM, Campus Gustavo Galindo Km 30.5 Vía Perimetral, Guayaquil P.O. Box 09-01-5863, Ecuador
- Escuela Superior Politécnica del Litoral, ESPOL, Facultad de Ingeniería Marítima y Ciencias del Mar, FIMCM, Campus Gustavo Galindo Km 30.5 Vía Perimetral, Guayaquil P.O. Box 09-01-5863, Ecuador
| | - Bonny Bayot
- Escuela Superior Politécnica del Litoral, ESPOL, Centro Nacional de Acuicultura e Investigaciones Marinas, CENAIM, Campus Gustavo Galindo Km 30.5 Vía Perimetral, Guayaquil P.O. Box 09-01-5863, Ecuador
- Escuela Superior Politécnica del Litoral, ESPOL, Facultad de Ingeniería Marítima y Ciencias del Mar, FIMCM, Campus Gustavo Galindo Km 30.5 Vía Perimetral, Guayaquil P.O. Box 09-01-5863, Ecuador
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Huang W, Qu L, Gao P, Du G. Bioassay and Whole-Genome Analysis of Bacillus velezensis FIO1408, a Biocontrol Agent Against Pathogenic Bacteria in Aquaculture. Curr Microbiol 2023; 80:354. [PMID: 37740122 DOI: 10.1007/s00284-023-03423-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Accepted: 03/04/2023] [Indexed: 09/24/2023]
Abstract
Bacterial disease is one of the most critical problems in aquaculture. Probiotics represent a promising biological approach to control bacterial disease because it is effective against pathogens and environmentally friendly. This study assessed the antagonistic activities of a bacterial strain FIO1408 isolated from deep-sea water against many pathogenic bacteria in aquaculture, including Listonella anguillarum, Vibrio parahaemolyticus, Vibrio alginolyticus, Aeromonas hydrophila, Edwardsiella anguillarum, Edwardsiella tarda, and Edwardsiella piscicida. The complete genome of strain FIO1408 consisted of a circular chromosome of 4,137,639 bp and two plasmids of 16,439 bp and 24,472 bp. Phylogenetic analysis showed strain FIO1408 clustered with Bacillus velezensis strains. 12 genes/gene clusters responsible for the synthesis of secondary metabolites were identified in the FIO1408 genome, including three lipopeptides, three polyketides, three bacteriocins, one siderophore, one dipeptide, and one unknown type. Also identified were 273 unique orthologous genes primarily involved in phage resistance, protein hydrolysis, environmental survivability, and genetic stability compared to B. velezensis KACC 13105, B. velezensis FZB42T, and B. velezensis NRRL B-41580. The principal safety of FIO1408 was demonstrated by genetic analyses and feeding trials. These findings will contribute to studies on the biocontrol mechanisms of B. velezensis FIO1408 and facilitate its application as a potent biological control agent against bacterial pathogens in aquaculture.
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Affiliation(s)
- Wenhao Huang
- Key Laboratory of Marine Eco-Environmental Science and Technology, First Institute of Oceanography, Ministry of Natural Resources (MNR), Qingdao, 266061, China
- Laboratory for Marine Fisheries Science and Food Production Processes, Laoshan Laboratory, Qingdao, 266237, China
| | - Lingyun Qu
- Key Laboratory of Marine Eco-Environmental Science and Technology, First Institute of Oceanography, Ministry of Natural Resources (MNR), Qingdao, 266061, China.
- Laboratory for Marine Fisheries Science and Food Production Processes, Laoshan Laboratory, Qingdao, 266237, China.
| | - Ping Gao
- Key Laboratory of Marine Eco-Environmental Science and Technology, First Institute of Oceanography, Ministry of Natural Resources (MNR), Qingdao, 266061, China.
- Laboratory for Marine Fisheries Science and Food Production Processes, Laoshan Laboratory, Qingdao, 266237, China.
| | - Guangxun Du
- Key Laboratory of Marine Eco-Environmental Science and Technology, First Institute of Oceanography, Ministry of Natural Resources (MNR), Qingdao, 266061, China
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Priya PS, Boopathi S, Murugan R, Haridevamuthu B, Arshad A, Arockiaraj J. Quorum sensing signals: Aquaculture risk factor. REVIEWS IN AQUACULTURE 2023; 15:1294-1310. [DOI: 10.1111/raq.12774] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 11/28/2022] [Indexed: 10/16/2023]
Abstract
AbstractBacteria produce several virulence factors and cause massive mortality in fish and crustaceans. Abundant quorum sensing (QS) signals and high cell density are essentially required for the production of such virulence factors. Although several strategies have been developed to control aquatic pathogens through antibiotics and QS inhibition, the impact of pre‐existing QS signals in the aquatic environment has been overlooked. QS signals cause detrimental effects on mammalian cells and induce cell death by interfering with multiple cellular pathways. Moreover, QS signals not only function as a messenger, but also annihilate the functions of the host immune system which implies that QS signals should be designated as a major virulence factor. Despite QS signals' role has been well documented in mammalian cells, their impact on aquatic organisms is still at the budding stage. However, many aquatic organisms produce enzymes that degrade and detoxify such QS signals. In addition, physical and chemical factors also determine the stability of the QS signals in the aqueous environment. The balance between QS signals and existing QS signals degrading factors essentially determines the disease progression in aquatic organisms. In this review, we highlight the impact of QS signals on aquatic organisms and further discussed potential alternative strategies to control disease progression.
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Affiliation(s)
- P. Snega Priya
- Department of Biotechnology, College of Science and Humanities SRM Institute of Science and Technology Chennai India
| | - Seenivasan Boopathi
- Department of Biotechnology, College of Science and Humanities SRM Institute of Science and Technology Chennai India
| | - Raghul Murugan
- Department of Biotechnology, College of Science and Humanities SRM Institute of Science and Technology Chennai India
| | - B. Haridevamuthu
- Department of Biotechnology, College of Science and Humanities SRM Institute of Science and Technology Chennai India
| | - Aziz Arshad
- International Institute of Aquaculture and Aquatic Sciences (I‐AQUAS) Universiti Putra Malaysia Negeri Sembilan Malaysia
| | - Jesu Arockiaraj
- Department of Biotechnology, College of Science and Humanities SRM Institute of Science and Technology Chennai India
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Najafpour B, Pinto PIS, Sanz EC, Martinez-Blanch JF, Canario AVM, Moutou KA, Power DM. Core microbiome profiles and their modification by environmental, biological, and rearing factors in aquaculture hatcheries. MARINE POLLUTION BULLETIN 2023; 193:115218. [PMID: 37441915 DOI: 10.1016/j.marpolbul.2023.115218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Revised: 06/06/2023] [Accepted: 06/22/2023] [Indexed: 07/15/2023]
Abstract
16S rRNA gene sequencing and bacteria- and genus-specific quantitative PCR was used to profile microbial communities and their associated functions in water, live feed (microalgae, Artemia, and rotifer), and European sea bass and gilthead sea bream larvae from hatcheries in Greece and Italy. The transfer to larvae of genus containing potential pathogens of fish was more likely with Artemia and rotifer than with microalgae or water, irrespective of geographic location. The presence of potentially pathogenic bacteria (Vibrio and Pseudoalteromonas) in the core microbiota of water, live feed, and fish larvae, the enrichment of different bacterial resistance pathways and biofilm formation, and the overall low beneficial bacteria load during larval ontogeny emphasizes the risk for disease outbreaks. The present data characterizing microbiota in commercial aquaculture hatcheries provides a baseline for the design of strategies to manage disease and to model or remediate potential adverse environmental impacts.
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Affiliation(s)
- Babak Najafpour
- CCMAR - Centre of Marine Sciences, Universidade do Algarve, Campus de Gambelas, Edifício 7, 8005-139 Faro, Portugal
| | - Patricia I S Pinto
- CCMAR - Centre of Marine Sciences, Universidade do Algarve, Campus de Gambelas, Edifício 7, 8005-139 Faro, Portugal
| | - Eric Climent Sanz
- ADM Biopolis, Parc Cientific Universidad De Valencia, Paterna, Spain
| | | | - Adelino V M Canario
- CCMAR - Centre of Marine Sciences, Universidade do Algarve, Campus de Gambelas, Edifício 7, 8005-139 Faro, Portugal; Shanghai Ocean University International Center for Marine Studies, Shanghai, China
| | - Katerina A Moutou
- Department of Biochemistry & Biotechnology, University of Thessaly, Ploutonos 26, Larissa, Greece
| | - Deborah M Power
- CCMAR - Centre of Marine Sciences, Universidade do Algarve, Campus de Gambelas, Edifício 7, 8005-139 Faro, Portugal; Shanghai Ocean University International Center for Marine Studies, Shanghai, China.
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Naga NG, El-Badan DE, Ghanem KM, Shaaban MI. It is the time for quorum sensing inhibition as alternative strategy of antimicrobial therapy. Cell Commun Signal 2023; 21:133. [PMID: 37316831 DOI: 10.1186/s12964-023-01154-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Accepted: 04/29/2023] [Indexed: 06/16/2023] Open
Abstract
Multiple drug resistance poses a significant threat to public health worldwide, with a substantial increase in morbidity and mortality rates. Consequently, searching for novel strategies to control microbial pathogenicity is necessary. With the aid of auto-inducers (AIs), quorum sensing (QS) regulates bacterial virulence factors through cell-to-cell signaling networks. AIs are small signaling molecules produced during the stationary phase. When bacterial cultures reach a certain level of growth, these molecules regulate the expression of the bound genes by acting as mirrors that reflect the inoculum density.Gram-positive bacteria use the peptide derivatives of these signaling molecules, whereas Gram-negative bacteria use the fatty acid derivatives, and the majority of bacteria can use both types to modulate the expression of the target gene. Numerous natural and synthetic QS inhibitors (QSIs) have been developed to reduce microbial pathogenesis. Applications of QSI are vital to human health, as well as fisheries and aquaculture, agriculture, and water treatment. Video Abstract.
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Affiliation(s)
- Nourhan G Naga
- Botany and Microbiology Department, Faculty of Science, Alexandria University, Alexandria, Egypt.
| | - Dalia E El-Badan
- Botany and Microbiology Department, Faculty of Science, Alexandria University, Alexandria, Egypt
- Department of Biological Sciences, Faculty of Science, Beirut Arab University, Beirut, Lebanon
| | - Khaled M Ghanem
- Botany and Microbiology Department, Faculty of Science, Alexandria University, Alexandria, Egypt
| | - Mona I Shaaban
- Microbiology and Immunology Department, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
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Gupta DS, Kumar MS. The implications of quorum sensing inhibition in bacterial antibiotic resistance- with a special focus on aquaculture. J Microbiol Methods 2022; 203:106602. [PMID: 36270462 DOI: 10.1016/j.mimet.2022.106602] [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: 06/12/2022] [Revised: 10/06/2022] [Accepted: 10/13/2022] [Indexed: 11/06/2022]
Abstract
The aquaculture industry is an expanding and demanding industry and due to an increase in urbanization, with rise in income of developing countries population, it offers to provide a sustainable food supply. However, the industry is facing a number of challenges, out of which few needs to be tackled immediately to maximise the productivity. An upcoming problem is the emergence of antibiotic resistant pathogens due to the unchecked use of antibiotics in aquaculture and human clinical practices. A wide variety of aquatic pathogens such as Edwardsiella, Vibrio, and Aeromonas spp. use quorum sensing (QS) systems, a regulatory process involving cell communication via signalling molecules for the collective function of pathogens which regulates the genes expression including virulent genes. Quorum sensing results in bacterial biofilms formation, which leads to their reduced susceptibility towards antimicrobial agents. The usage of quorum sensing inhibitors (QSIs) has been proposed as an attractive strategy to tackle this problem. Due to the modulation of virulence genes expression, QSIs can be used as novel and viable approach to overcome antibiotic resistance in aquaculture. In this review, we direct our attention to the quorum sensing phenomenon and its viability as a target pathway for tackling the ever-growing problem of antimicrobial resistance in aquaculture. This review also provides a concise compilation of the currently available QSIs and investigates possible natural sources for quorum quenching.
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Affiliation(s)
- Dhruv S Gupta
- Shobhaben Pratapbhai Patel School of Pharmacy and Technology Management, SVKM'(S) NMIMS, Vile Parle (w), Mumbai 400056, India
| | - Maushmi S Kumar
- Shobhaben Pratapbhai Patel School of Pharmacy and Technology Management, SVKM'(S) NMIMS, Vile Parle (w), Mumbai 400056, India.
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Biochemical and molecular characterization of three serologically different Vibrio harveyi strains isolated from farmed Dicentrarchus labrax from the Adriatic Sea. Sci Rep 2022; 12:7309. [PMID: 35508554 PMCID: PMC9068760 DOI: 10.1038/s41598-022-10720-z] [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] [Received: 10/04/2021] [Accepted: 04/12/2022] [Indexed: 11/08/2022] Open
Abstract
Vibrio harveyi is recognized as one of the major causes of vibriosis, a disease that threatens the long-term sustainability of aquaculture. Current research shows that the Mediterranean strains of V. harveyi are serologically heterogeneous, though research comparing the traits of different strains is scarce. This study aims to describe the biochemical, physiological and genetic characteristics of three serologically different strains of V. harveyi isolated from farmed European Sea bass (Dicentrarchus labrax) from the Adriatic Sea. A total of 32 morphological and biochemical markers were examined and, the susceptibility to 13 antimicrobials tested, and then compared the results of high-throughput sequencing and in silico analyses. This study also presents the first whole genome sequences of V. harveyi isolated from European sea bass. A large number of nonsynonymous variations were detected among sequences of the three strains. The prediction analysis of resistance genes did not correspond with the in vitro antimicrobial susceptibility tests. Six virulence genes previously unrelated to virulence of vibrios were detected in all three studied strains. The results show that differences were detected at every level of comparison among the three studied strains isolated from the same fish species originating from a small geographic area.
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Reina JC, Pérez P, Llamas I. Quorum Quenching Strains Isolated from the Microbiota of Sea Anemones and Holothurians Attenuate Vibriocorallilyticus Virulence Factors and Reduce Mortality in Artemiasalina. Microorganisms 2022; 10:microorganisms10030631. [PMID: 35336206 PMCID: PMC8950658 DOI: 10.3390/microorganisms10030631] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 03/08/2022] [Accepted: 03/14/2022] [Indexed: 01/19/2023] Open
Abstract
Interference with quorum-sensing (QS) intercellular communication systems by the enzymatic disruption of N-acylhomoserine lactones (AHLs) in Gram-negative bacteria has become a promising strategy to fight bacterial infections. In this study, seven strains previously isolated from marine invertebrates and selected for their ability to degrade C6 and C10-HSL, were identified as Acinetobacter junii, Ruegeria atlantica, Microbulbifer echini, Reinheimera aquimaris, and Pseudomonas sihuiensis. AHL-degrading activity against a wide range of synthetic AHLs were identified by using an agar well diffusion assay and Agrobacterium tumefaciens NTL4 and Chromobacterium violaceum CV026 and VIR07 as biosensors. High-performance liquid chromatography-mass spectrometry (HPLC-MS) analysis indicated that this activity was not due to an AHL lactonase. All the strains degraded Vibrio coralliilyticus AHLs in coculture experiments, while some strains reduced or abolished the production of virulence factors. In vivo assays showed that strains M3-111 and M3-127 reduced this pathogen’s virulence and increased the survival rate of Artemia salina up to 3-fold, indicating its potential use for biotechnological purposes. To our knowledge, this is the first study to describe AHL-degrading activities in some of these marine species. These findings highlight that the microbiota associated with marine invertebrates constitute an important underexplored source of biological valuable compounds.
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Affiliation(s)
- José Carlos Reina
- Department of Microbiology, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain; (J.C.R.); (P.P.)
| | - Pedro Pérez
- Department of Microbiology, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain; (J.C.R.); (P.P.)
| | - Inmaculada Llamas
- Department of Microbiology, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain; (J.C.R.); (P.P.)
- Biomedical Research Center (CIBM), Institute of Biotechnology, University of Granada, 18100 Granada, Spain
- Correspondence:
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Perković L, Djedović E, Vujović T, Baković M, Paradžik T, Čož-Rakovac R. Biotechnological Enhancement of Probiotics through Co-Cultivation with Algae: Future or a Trend? Mar Drugs 2022; 20:142. [PMID: 35200671 PMCID: PMC8880515 DOI: 10.3390/md20020142] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 02/08/2022] [Accepted: 02/12/2022] [Indexed: 12/18/2022] Open
Abstract
The diversity of algal species is a rich source of many different bioactive metabolites. The compounds extracted from algal biomass have various beneficial effects on health. Recently, co-culture systems between microalgae and bacteria have emerged as an interesting solution that can reduce the high contamination risk associated with axenic cultures and, consequently, increase biomass yield and synthesis of active compounds. Probiotic microorganisms also have numerous positive effects on various aspects of health and represent potent co-culture partners. Most studies consider algae as prebiotics that serve as enhancers of probiotics performance. However, the extreme diversity of algal organisms and their ability to produce a plethora of metabolites are leading to new experimental designs in which these organisms are cultivated together to derive maximum benefit from their synergistic interactions. The future success of these studies depends on the precise experimental design of these complex systems. In the last decade, the development of high-throughput approaches has enabled a deeper understanding of global changes in response to interspecies interactions. Several studies have shown that the addition of algae, along with probiotics, can influence the microbiota, and improve gut health and overall yield in fish, shrimp, and mussels aquaculture. In the future, such findings can be further explored and implemented for use as dietary supplements for humans.
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Affiliation(s)
- Lucija Perković
- Laboratory for Aquaculture Biotechnology, Division of Materials Chemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia; (L.P.); (E.D.); (T.V.); (M.B.); (R.Č.-R.)
| | - Elvis Djedović
- Laboratory for Aquaculture Biotechnology, Division of Materials Chemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia; (L.P.); (E.D.); (T.V.); (M.B.); (R.Č.-R.)
| | - Tamara Vujović
- Laboratory for Aquaculture Biotechnology, Division of Materials Chemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia; (L.P.); (E.D.); (T.V.); (M.B.); (R.Č.-R.)
| | - Marija Baković
- Laboratory for Aquaculture Biotechnology, Division of Materials Chemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia; (L.P.); (E.D.); (T.V.); (M.B.); (R.Č.-R.)
| | - Tina Paradžik
- Laboratory for Aquaculture Biotechnology, Division of Materials Chemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia; (L.P.); (E.D.); (T.V.); (M.B.); (R.Č.-R.)
- Center of Excellence for Marine Bioprospecting (BioProCro), Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
| | - Rozelindra Čož-Rakovac
- Laboratory for Aquaculture Biotechnology, Division of Materials Chemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia; (L.P.); (E.D.); (T.V.); (M.B.); (R.Č.-R.)
- Center of Excellence for Marine Bioprospecting (BioProCro), Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
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Maharajan AD, Hjerde E, Hansen H, Willassen NP. Quorum Sensing Controls the CRISPR and Type VI Secretion Systems in Aliivibrio wodanis 06/09/139. Front Vet Sci 2022; 9:799414. [PMID: 35211539 PMCID: PMC8861277 DOI: 10.3389/fvets.2022.799414] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Accepted: 01/12/2022] [Indexed: 12/26/2022] Open
Abstract
For bacteria to thrive in an environment with competitors, phages and environmental cues, they use different strategies, including Type VI Secretion Systems (T6SSs) and Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR) to compete for space. Bacteria often use quorum sensing (QS), to coordinate their behavior as the cell density increases. Like other aliivibrios, Aliivibrio wodanis 06/09/139 harbors two QS systems, the main LuxS/LuxPQ system and an N-acyl homoserine lactone (AHL)-mediated AinS/AinR system and a master QS regulator, LitR. To explore the QS and survival strategies, we performed genome analysis and gene expression profiling on A. wodanis and two QS mutants (ΔainS and ΔlitR) at two cell densities (OD600 2.0 and 6.0) and temperatures (6 and 12°C). Genome analysis of A. wodanis revealed two CRISPR systems, one without a cas loci (CRISPR system 1) and a type I-F CRISPR system (CRISPR system 2). Our analysis also identified three main T6SS clusters (T6SS1, T6SS2, and T6SS3) and four auxiliary clusters, as well about 80 potential Type VI secretion effectors (T6SEs). When comparing the wildtype transcriptome data at different cell densities and temperatures, 13-18% of the genes were differentially expressed. The CRISPR system 2 was cell density and temperature-independent, whereas the CRISPR system 1 was temperature-dependent and cell density-independent. The primary and auxiliary clusters of T6SSs were both cell density and temperature-dependent. In the ΔlitR and ΔainS mutants, several CRISPR and T6SS related genes were differentially expressed. Deletion of litR resulted in decreased expression of CRISPR system 1 and increased expression of CRISPR system 2. The T6SS1 and T6SS2 gene clusters were less expressed while the T6SS3 cluster was highly expressed in ΔlitR. Moreover, in ΔlitR, the hcp1 gene was strongly activated at 6°C compared to 12°C. AinS positively affected the csy genes in the CRISPR system 2 but did not affect the CRISPR arrays. Although AinS did not significantly affect the expression of T6SSs, the hallmark genes of T6SS (hcp and vgrG) were AinS-dependent. The work demonstrates that T6SSs and CRISPR systems in A. wodanis are QS dependent and may play an essential role in survival in its natural environment.
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Affiliation(s)
- Amudha Deepalakshmi Maharajan
- Norwegian Structural Biology Center and Department of Chemistry, Faculty of Science and Technology, UiT The Arctic University of Norway, Tromsø, Norway
| | - Erik Hjerde
- Norwegian Structural Biology Center and Department of Chemistry, Faculty of Science and Technology, UiT The Arctic University of Norway, Tromsø, Norway
- Centre for Bioinformatics, Department of Chemistry, Faculty of Science and Technology, UiT The Arctic University of Norway, Tromsø, Norway
| | - Hilde Hansen
- Norwegian Structural Biology Center and Department of Chemistry, Faculty of Science and Technology, UiT The Arctic University of Norway, Tromsø, Norway
| | - Nils Peder Willassen
- Norwegian Structural Biology Center and Department of Chemistry, Faculty of Science and Technology, UiT The Arctic University of Norway, Tromsø, Norway
- Centre for Bioinformatics, Department of Chemistry, Faculty of Science and Technology, UiT The Arctic University of Norway, Tromsø, Norway
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Zhang Y, Zheng L, Wang S, Zhao Y, Xu X, Han B, Hu T. Quorum Sensing Bacteria in the Phycosphere of HAB Microalgae and Their Ecological Functions Related to Cross-Kingdom Interactions. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 19:ijerph19010163. [PMID: 35010421 PMCID: PMC8750903 DOI: 10.3390/ijerph19010163] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 12/06/2021] [Accepted: 12/11/2021] [Indexed: 12/28/2022]
Abstract
It has been proven that the relationship between microalgae and bacteria affects the dynamic process of harmful algal blooms (HABs). Microalgae-associated microorganisms widely exist in the phycosphere and play an essential role in algae-bacteria cross-kingdom interactions. Among these processes, quorum sensing (QS), as a communication system of bacteria, is thought to participate in algae-bacteria interactions. However, the species of QS bacteria in the phycosphere and their ecological function are still unknown. In this study, microalgae-associated microorganisms with a QS system were screened by the biosensor method and identified based on 16S rRNA gene analysis. The types and number of acyl-L-homoserine lactone (AHL) signalling molecules produced by QS bacteria were analysed by thin layer chromatography (TLC) bioautography and gas chromatography-mass spectrometer (GC-MS). The film formation, β-dimethylmercaptopropionic (DMSP) degradation and algae growth effects of QS bacteria were investigated. The results showed that 113 QS bacteria were isolated from 842 microalgae-associated bacteria. Detection of AHL molecules in 10 different species of QS bacteria showed that most of them were N-(3-Oxodecanoyl)-L-homoserine lactone (OC10-HSL), N-Octanoyl-L-homoserine lactone (C8-HSL) and N-(3-Oxooctanoyl)-L-homoserine lactone (OC8-HSL). All 10 QS bacteria had film-forming ability, and they could degrade DMSP (except strain E26). The crude metabolic extracts of the 10 QS bacteria can inhibit or promote microalgae growth to different degrees. Our study is helpful to understand the role of microalgae-associated microorganisms with the QS system in algae-bacteria interactions and community succession of HAB microalgae.
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Affiliation(s)
- Yanchao Zhang
- College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China; (Y.Z.); (Y.Z.)
| | - Li Zheng
- Key Laboratory of Marine Ecological Environment Science and Technology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China; (S.W.); (X.X.); (T.H.)
- Qingdao National Laboratory of Marine Science and Technology Pilot, Functional Laboratory of Marine Ecology and Environmental Science, Qingdao 266071, China;
- Correspondence:
| | - Shuai Wang
- Key Laboratory of Marine Ecological Environment Science and Technology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China; (S.W.); (X.X.); (T.H.)
| | - Yangguo Zhao
- College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China; (Y.Z.); (Y.Z.)
| | - Xiyuan Xu
- Key Laboratory of Marine Ecological Environment Science and Technology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China; (S.W.); (X.X.); (T.H.)
| | - Bin Han
- Qingdao National Laboratory of Marine Science and Technology Pilot, Functional Laboratory of Marine Ecology and Environmental Science, Qingdao 266071, China;
| | - Tianyi Hu
- Key Laboratory of Marine Ecological Environment Science and Technology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China; (S.W.); (X.X.); (T.H.)
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Friends or Foes-Microbial Interactions in Nature. BIOLOGY 2021; 10:biology10060496. [PMID: 34199553 PMCID: PMC8229319 DOI: 10.3390/biology10060496] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 05/27/2021] [Accepted: 05/31/2021] [Indexed: 12/16/2022]
Abstract
Simple Summary Microorganisms like bacteria, archaea, fungi, microalgae, and viruses mostly form complex interactive networks within the ecosystem rather than existing as single planktonic cells. Interactions among microorganisms occur between the same species, with different species, or even among entirely different genera, families, or even domains. These interactions occur after environmental sensing, followed by converting those signals to molecular and genetic information, including many mechanisms and classes of molecules. Comprehensive studies on microbial interactions disclose key strategies of microbes to colonize and establish in a variety of different environments. Knowledge of the mechanisms involved in the microbial interactions is essential to understand the ecological impact of microbes and the development of dysbioses. It might be the key to exploit strategies and specific agents against different facing challenges, such as chronic and infectious diseases, hunger crisis, pollution, and sustainability. Abstract Microorganisms are present in nearly every niche on Earth and mainly do not exist solely but form communities of single or mixed species. Within such microbial populations and between the microbes and a eukaryotic host, various microbial interactions take place in an ever-changing environment. Those microbial interactions are crucial for a successful establishment and maintenance of a microbial population. The basic unit of interaction is the gene expression of each organism in this community in response to biotic or abiotic stimuli. Differential gene expression is responsible for producing exchangeable molecules involved in the interactions, ultimately leading to community behavior. Cooperative and competitive interactions within bacterial communities and between the associated bacteria and the host are the focus of this review, emphasizing microbial cell–cell communication (quorum sensing). Further, metagenomics is discussed as a helpful tool to analyze the complex genomic information of microbial communities and the functional role of different microbes within a community and to identify novel biomolecules for biotechnological applications.
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Malka O, Kalson D, Yaniv K, Shafir R, Rajendran M, Ben-David O, Kushmaro A, Meijler MM, Jelinek R. Cross-kingdom inhibition of bacterial virulence and communication by probiotic yeast metabolites. MICROBIOME 2021; 9:70. [PMID: 33762022 PMCID: PMC7992341 DOI: 10.1186/s40168-021-01027-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 02/05/2021] [Indexed: 06/12/2023]
Abstract
BACKGROUND Probiotic milk-fermented microorganism mixtures (e.g., yogurt, kefir) are perceived as contributing to human health, and possibly capable of protecting against bacterial infections. Co-existence of probiotic microorganisms are likely maintained via complex biomolecular mechanisms, secreted metabolites mediating cell-cell communication, and other yet-unknown biochemical pathways. In particular, deciphering molecular mechanisms by which probiotic microorganisms inhibit proliferation of pathogenic bacteria would be highly important for understanding both the potential benefits of probiotic foods as well as maintenance of healthy gut microbiome. RESULTS The microbiome of a unique milk-fermented microorganism mixture was determined, revealing a predominance of the fungus Kluyveromyces marxianus. We further identified a new fungus-secreted metabolite-tryptophol acetate-which inhibits bacterial communication and virulence. We discovered that tryptophol acetate blocks quorum sensing (QS) of several Gram-negative bacteria, particularly Vibrio cholerae, a prominent gut pathogen. Notably, this is the first report of tryptophol acetate production by a yeast and role of the molecule as a signaling agent. Furthermore, mechanisms underscoring the anti-QS and anti-virulence activities of tryptophol acetate were elucidated, specifically down- or upregulation of distinct genes associated with V. cholerae QS and virulence pathways. CONCLUSIONS This study illuminates a yet-unrecognized mechanism for cross-kingdom inhibition of pathogenic bacteria cell-cell communication in a probiotic microorganism mixture. A newly identified fungus-secreted molecule-tryptophol acetate-was shown to disrupt quorum sensing pathways of the human gut pathogen V. cholerae. Cross-kingdom interference in quorum sensing may play important roles in enabling microorganism co-existence in multi-population environments, such as probiotic foods and the gut microbiome. This discovery may account for anti-virulence properties of the human microbiome and could aid elucidating health benefits of probiotic products against bacterially associated diseases. Video Abstract.
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Affiliation(s)
- Orit Malka
- Department of Chemistry, Ben-Gurion University of the Negev, 84105 Be’er Sheva, Israel
| | - Dorin Kalson
- Department of Chemistry, Ben-Gurion University of the Negev, 84105 Be’er Sheva, Israel
| | - Karin Yaniv
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Ben-Gurion University of the Negev, 84105 Be’er Sheva, Israel
| | - Reut Shafir
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Ben-Gurion University of the Negev, 84105 Be’er Sheva, Israel
| | - Manikandan Rajendran
- Department of Chemistry, Ben-Gurion University of the Negev, 84105 Be’er Sheva, Israel
| | - Oshrit Ben-David
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Ben-Gurion University of the Negev, 84105 Be’er Sheva, Israel
| | - Ariel Kushmaro
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Ben-Gurion University of the Negev, 84105 Be’er Sheva, Israel
- National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, 84105 Be’er Sheva, Israel
| | - Michael M. Meijler
- Department of Chemistry, Ben-Gurion University of the Negev, 84105 Be’er Sheva, Israel
- National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, 84105 Be’er Sheva, Israel
| | - Raz Jelinek
- Department of Chemistry, Ben-Gurion University of the Negev, 84105 Be’er Sheva, Israel
- Ilse Katz Institute for Nanoscale Science & Technology, Ben Gurion University of the Negev, 84105 Be’er Sheva, Israel
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AhaP, A Quorum Quenching Acylase from Psychrobacter sp. M9-54-1 That Attenuates Pseudomonas aeruginosa and Vibrio coralliilyticus Virulence. Mar Drugs 2021; 19:md19010016. [PMID: 33401388 PMCID: PMC7823738 DOI: 10.3390/md19010016] [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: 12/07/2020] [Revised: 12/22/2020] [Accepted: 12/27/2020] [Indexed: 12/11/2022] Open
Abstract
Although Psychrobacter strain M9-54-1 had been previously isolated from the microbiota of holothurians and shown to degrade quorum sensing (QS) signal molecules C6 and C10-homoserine lactone (HSL), little was known about the gene responsible for this activity. In this study, we determined the whole genome sequence of this strain and found that the full 16S rRNA sequence shares 99.78-99.66% identity with Psychrobacter pulmonis CECT 5989T and P. faecalis ISO-46T. M9-54-1, evaluated using the agar well diffusion assay method, showed high quorum quenching (QQ) activity against a wide range of synthetic N-acylhomoserine lactone (AHLs) at 4, 15, and 28 °C. High-performance liquid chromatography-mass-spectrometry (HPLC-MS) confirmed that QQ activity was due to an AHL-acylase. The gene encoding for QQ activity in strain M9-54-1 was identified from its genome sequence whose gene product was named AhaP. Purified AhaP degraded substituted and unsubstituted AHLs from C4- to C14-HSL. Furthermore, heterologous expression of ahaP in the opportunistic pathogen Pseudomonas aeruginosa PAO1 reduced the expression of the QS-controlled gene lecA, encoding for a cytotoxic galactophilic lectin and swarming motility protein. Strain M9-54-1 also reduced brine shrimp mortality caused by Vibrio coralliilyticus VibC-Oc-193, showing potential as a biocontrol agent in aquaculture.
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16
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Influence of microalgal lipids from Chlorella variabilis (ATCC PTA 12198) in reducing the virulence factors of multidrug-resistant Vibrio cholerae variant strains. Lebensm Wiss Technol 2021. [DOI: 10.1016/j.lwt.2020.110047] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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17
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Abdul Malik SA, Bazire A, Gamboa-Muñoz A, Bedoux G, Robledo D, García-Maldonado JQ, Bourgougnon N. Screening of Surface-associated Bacteria from the Mexican Red Alga Halymenia floresii for Quorum Sensing Activity. Microbiology (Reading) 2020. [DOI: 10.1134/s0026261720060132] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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18
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Characterization of a Novel Quorum-Quenching Bacterial Strain, Burkholderia anthina HN-8, and Its Biocontrol Potential against Black Rot Disease Caused by Xanthomonas campestris pv. campestris. Microorganisms 2020; 8:microorganisms8101485. [PMID: 32992637 PMCID: PMC7601453 DOI: 10.3390/microorganisms8101485] [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: 07/10/2020] [Revised: 09/24/2020] [Accepted: 09/26/2020] [Indexed: 12/14/2022] Open
Abstract
Diffusible signal factor (DSF) is a type of cis unsaturated fatty acid, with a chemical structure of 11-methyl-2-dodecylene acid. DSF is widely conserved in a variety of Gram-negative bacterial pathogens and is involved in the regulation of pathogenic virulence. Quorum quenching (QQ) is a promising strategy for preventing and controlling quorum sensing (QS)-mediated bacterial infections by interfering with the QS system of pathogens. In this study, a novel DSF-degrading bacterium, Burkholderia anthina strain HN-8, was isolated and characterized for its degradation ability and potential biocontrol of black rot disease caused by Xanthomonas campestris pv. campestris (Xcc). The HN-8 strain exhibited superb DSF degradation activity and completely degraded 2 mM DSF within 48 h. In addition, we present the first evidence of bacterium having a metabolic pathway for the complete degradation and metabolism of DSF. Analysis of DSF metabolic products by gas chromatography–mass spectrometry led to the identification of dodecanal as the main intermediate product, revealing that DSF could be degraded via oxidation–reduction. Furthermore, application of strain HN-8 as a potent biocontrol agent was able to significantly reduce the severity of black rot disease in radishes and Chinese cabbage. Taken together, these results shed light on the QQ mechanisms of DSF, and they provide useful information showing the potential for the biocontrol of infectious diseases caused by DSF-dependent bacterial pathogens.
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19
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Ramli NM, Verreth JAJ, Yusoff FM, Nurulhuda K, Nagao N, Verdegem MCJ. Integration of Algae to Improve Nitrogenous Waste Management in Recirculating Aquaculture Systems: A Review. Front Bioeng Biotechnol 2020; 8:1004. [PMID: 33015002 PMCID: PMC7498764 DOI: 10.3389/fbioe.2020.01004] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Accepted: 07/31/2020] [Indexed: 11/13/2022] Open
Abstract
This review investigates the performance and the feasibility of the integration of an algal reactor in recirculating aquaculture systems (RAS). The number of studies related to this topic is limited, despite the apparent benefit of algae that can assimilate part of the inorganic waste in RAS. We identified two major challenges related to algal integration in RAS: first, the practical feasibility for improving nitrogen removal performance by algae in RAS; second, the economic feasibility of integrating an algal reactor in RAS. The main factors that determine high algal nitrogen removal rates are light and hydraulic retention time (HRT). Besides these factors, nitrogen-loading rates and RAS configuration could be important to ensure algal performance in nitrogen removal. Since nitrogen removal rate by algae is determined by HRT, this will affect the size (area or volume) of the algal reactor due to the time required for nutrient uptake by algae and large surface area needed to capture enough light. Constraints related to design, space, light capture, and reactor management could incur additional cost for aquaculture production. However, the increased purification of RAS wastewater could reduce the cost of water discharge in places where this is subject to levees. We believe that an improved understanding of how to manage the algal reactor and technological advancement of culturing algae, such as improved algal reactor design and low-cost artificial light, will increase the practical and economic feasibility of algal integration in RAS, thus improving the potential of mass cultivation of algae in RAS.
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Affiliation(s)
- Norulhuda Mohamed Ramli
- Aquaculture and Fisheries Group, Wageningen University & Research, Wageningen, Netherlands.,Department of Biological and Agricultural Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang, Malaysia
| | - J A J Verreth
- Aquaculture and Fisheries Group, Wageningen University & Research, Wageningen, Netherlands
| | - Fatimah M Yusoff
- International Institute of Aquaculture and Aquatic Sciences, Universiti Putra Malaysia, Port Dickson, Malaysia.,Department of Aquaculture, Faculty of Agriculture, Universiti Putra Malaysia, Serdang, Malaysia
| | - K Nurulhuda
- Department of Biological and Agricultural Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang, Malaysia
| | - N Nagao
- Bluescientific Shinkamigoto Co. Ltd. (BSCIS), Nagasaki, Japan
| | - Marc C J Verdegem
- Aquaculture and Fisheries Group, Wageningen University & Research, Wageningen, Netherlands
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20
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Wang H, Qi B, Jiang X, Jiang Y, Yang H, Xiao Y, Jiang N, Deng L, Wang W. Microalgal interstrains differences in algal-bacterial biofloc formation during liquid digestate treatment. BIORESOURCE TECHNOLOGY 2019; 289:121741. [PMID: 31323710 DOI: 10.1016/j.biortech.2019.121741] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 06/28/2019] [Accepted: 06/29/2019] [Indexed: 06/10/2023]
Abstract
In this study, the effect of microalgal strains on the formation of algal-bacterial biofloc was investigated in liquid digestate pretreated by a sequencing batch reactor (SBR), which loaded much aerobic bacteria from activated sludge. Six microalgal strains resulted in three cases: no-bioflocculation (Scenedesmus obliquus and Botryococcus braunii), optimal-bioflocculation with high flocculation activity and good growth (Chlorella sp. BWY-1, Haematococcus pluvialis and Dictyosphaerium ehnenbergianum) and over-bioflocculation with high flocculation activity and bad growth (Chlorella vulgaris). Chlorella sp. BWY-1 provided a better level of flocculation activity and growth. Polysaccharides and proteins were present in EPS of algal-bacterial biofloc, and their distribution was confirmed by staining with alcian blue and fluorescein isothiocyanate (FITC).
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Affiliation(s)
- Hong Wang
- Key Laboratory of Development and Application of Rural Renewable Energy, Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China
| | - Bufan Qi
- College of Pharmacy and Biological Engineering, Chengdu University, No. 2205, Cheng Luo Road, Chengdu 610106, PR China
| | - Xiaomei Jiang
- Key Laboratory of Development and Application of Rural Renewable Energy, Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China
| | - Yiqi Jiang
- Environmental Science & Engineering Research Center, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, PR China
| | - Han Yang
- Key Laboratory of Development and Application of Rural Renewable Energy, Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China
| | - Youqian Xiao
- Key Laboratory of Development and Application of Rural Renewable Energy, Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China
| | - Na Jiang
- Key Laboratory of Development and Application of Rural Renewable Energy, Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China
| | - Liangwei Deng
- Key Laboratory of Development and Application of Rural Renewable Energy, Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China
| | - Wenguo Wang
- Key Laboratory of Development and Application of Rural Renewable Energy, Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China.
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21
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Zhang B, Zhuang X, Guo L, McLean RJC, Chu W. Recombinant N-acyl homoserine lactone-Lactonase AiiA QSI-1 Attenuates Aeromonas hydrophila Virulence Factors, Biofilm Formation and Reduces Mortality in Crucian Carp. Mar Drugs 2019; 17:E499. [PMID: 31461929 PMCID: PMC6780897 DOI: 10.3390/md17090499] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 08/15/2019] [Accepted: 08/24/2019] [Indexed: 01/19/2023] Open
Abstract
Quorum quenching (QQ) is a promising alternative infection-control strategy to antibiotics that controls quorum-regulated virulence without killing the pathogens. Aeromonas hydrophila is an opportunistic gram-negative pathogen living in freshwater and marine environments. A. hydrophila possesses an N-acyl homoserine lactone (AHL)-based quorum-sensing (QS) system that regulates virulence, so quorum signal-inactivation (i.e., QQ) may represent a new way to combat A. hydrophila infection. In this study, an AHL lactonase gene, aiiA was cloned from Bacillus sp. strain QSI-1 and expressed in Escherichia coli strain BL21(DE3). The A. hydrophila hexanoyl homoserine lactone (C6-HSL) QS signal molecule was degraded by AiiAQSI-1, which resulted in a decrease of bacterial swimming motility, reduction of extracellular protease and hemolysin virulence factors, and inhibited the biofilm formation of A. hydrophila YJ-1 in a microtiter assay. In cell culture studies, AiiAQSI-1 decreased the ability of A. hydrophila adherence to and internalization by Epithelioma papulosum cyprini (EPC) cells. During in vivo studies, oral administration of AiiAQSI-1 via feed supplementation attenuated A. hydrophila infection in Crucian Carp. Results from this work indicate that feed supplementation with AiiAQSI-1 protein has potential to control A. hydrophila aquaculture disease via QQ.
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Affiliation(s)
- Bao Zhang
- Department of Pharmaceutical Microbiology, School of Life Science and Technology, China Pharmaceutical University, Nanjing 210009, China
| | - Xiyi Zhuang
- Department of Pharmaceutical Microbiology, School of Life Science and Technology, China Pharmaceutical University, Nanjing 210009, China
| | - Liyun Guo
- Department of Microbiology, Nanjing Institute of Fisheries Science, Nanjing 210036, China
| | - Robert J C McLean
- Department of Biology, Texas State University, San Marcos, TX 78666, USA
| | - Weihua Chu
- Department of Pharmaceutical Microbiology, School of Life Science and Technology, China Pharmaceutical University, Nanjing 210009, China.
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Reina JC, Pérez-Victoria I, Martín J, Llamas I. A Quorum-Sensing Inhibitor Strain of Vibrio alginolyticus Blocks Qs-Controlled Phenotypes in Chromobacterium violaceum and Pseudomonas aeruginosa. Mar Drugs 2019; 17:md17090494. [PMID: 31450549 PMCID: PMC6780304 DOI: 10.3390/md17090494] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 08/14/2019] [Accepted: 08/22/2019] [Indexed: 12/11/2022] Open
Abstract
The cell density-dependent mechanism, quorum sensing (QS), regulates the expression of virulence factors. Its inhibition has been proposed as a promising new strategy to prevent bacterial pathogenicity. In this study, 827 strains from the microbiota of sea anemones and holothurians were screened for their ability to produce quorum-sensing inhibitor (QSI) compounds. The strain M3-10, identified as Vibrio alginolyticus by 16S rRNA gene sequencing, as well as ANIb and dDDH analyses, was selected for its high QSI activity. Bioassay-guided fractionation of the cell pellet extract from a fermentation broth of strain M3-10, followed by LC–MS and NMR analyses, revealed tyramine and N-acetyltyramine as the active compounds. The QS inhibitory activity of these molecules, which was confirmed using pure commercially available standards, was found to significantly inhibit Chromobacterium violaceum ATCC 12472 violacein production and virulence factors, such as pyoverdine production, as well as swarming and twitching motilities, produced by Pseudomonas aeruginosa PAO1. This constitutes the first study to screen QSI-producing strains in the microbiota of anemones and holothurians and provides an insight into the use of naturally produced QSI as a possible strategy to combat bacterial infections.
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Affiliation(s)
- José Carlos Reina
- Department of Microbiology, Faculty of Pharmacy, University of Granada, Campus Universitario Cartuja s/n, 18071 Granada, Spain
| | - Ignacio Pérez-Victoria
- MEDINA Foundation, Andalusian Center of Excellence for Research into Innovative Medicines, Health Sciences Technological Park (PTS), Avda. del Conocimiento 34, 18016 Armilla, Granada, Spain.
| | - Jesús Martín
- MEDINA Foundation, Andalusian Center of Excellence for Research into Innovative Medicines, Health Sciences Technological Park (PTS), Avda. del Conocimiento 34, 18016 Armilla, Granada, Spain
| | - Inmaculada Llamas
- Department of Microbiology, Faculty of Pharmacy, University of Granada, Campus Universitario Cartuja s/n, 18071 Granada, Spain.
- Institute of Biotechnology, Biomedical Research Center (CIBM), University of Granada, 18100 Granada, Spain.
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Mohamad N, Amal MNA, Saad MZ, Yasin ISM, Zulkiply NA, Mustafa M, Nasruddin NS. Virulence-associated genes and antibiotic resistance patterns of Vibrio spp. isolated from cultured marine fishes in Malaysia. BMC Vet Res 2019; 15:176. [PMID: 31138199 PMCID: PMC6537206 DOI: 10.1186/s12917-019-1907-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Accepted: 05/10/2019] [Indexed: 12/18/2022] Open
Abstract
Background Vibriosis is an important bacterial disease of cultured marine fishes worldwide. However, information on the virulence and antibiotic resistance of Vibrio spp. isolated from fish are scarce. This study investigates the distribution of virulence associated genes and antibiotic resistance patterns of Vibrio spp. isolated from cage-cultured marine fishes in Malaysia. Results A total of 63 Vibrio spp. isolated from 62 cultured marine fishes in various geographical regions in Peninsular Malaysia were analysed. Forty-two of the isolates (66.7%) were positive for all chiA, luxR and vhpA, the virulence genes produced by pathogenic V. harveyi. A total of 62 Vibrio isolates (98%) had tlh gene of V. parahaemolyticus, while flaC gene of V. anguillarum was detected in 43 of isolates (68%). Other virulence genes, including tdh, trh, hlyA and toxRvc were absent from any of the isolates. Multiple antibiotic resistance (MAR) was exhibited in all strains of Harveyi clade, particularly against ampicillin, penicillin, polypeptides, cephems and streptomycin. The MAR index ranged between 0.06 and 0.56, and 75% of the isolates have MAR index of higher than 0.20. Host species and geographical origin showed no correlation with the presence of virulence genes and the antibiotic resistance patterns of Vibrio spp. Conclusions The study indicates that majority of Vibrio spp. isolated from cultured marine fishes possess virulence genes, but were not associated with human pathogen. However, the antibiotics resistance is a real concern and warrants ongoing surveillance. These findings represent an updated knowledge on the risk of Vibrio spp. to human health, and also provides valuable insight on alternative approaches to combat vibriosis in cultured fish.
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Affiliation(s)
- Nurliyana Mohamad
- Department of Biology, Faculty of Science, Universiti Putra Malaysia, 43400, UPM Serdang, Selangor, Malaysia
| | - Mohammad Noor Azmai Amal
- Department of Biology, Faculty of Science, Universiti Putra Malaysia, 43400, UPM Serdang, Selangor, Malaysia. .,Laboratory of Marine Biotechnology, Institute of Bioscience, Universiti Putra Malaysia, 43400, UPM Serdang, Selangor, Malaysia.
| | - Mohd Zamri Saad
- Department of Veterinary Laboratory Diagnosis, Faculty of Veterinary Medicine, Universiti Putra Malaysia, 43400, UPM Serdang, Selangor, Malaysia.,Laboratory of Marine Biotechnology, Institute of Bioscience, Universiti Putra Malaysia, 43400, UPM Serdang, Selangor, Malaysia
| | - Ina Salwany Md Yasin
- Department of Aquaculture, Faculty of Agriculture, Universiti Putra Malaysia, 43400, UPM Serdang, Selangor, Malaysia.,Laboratory of Marine Biotechnology, Institute of Bioscience, Universiti Putra Malaysia, 43400, UPM Serdang, Selangor, Malaysia
| | - Nor Amalina Zulkiply
- Department of Aquaculture, Faculty of Agriculture, Universiti Putra Malaysia, 43400, UPM Serdang, Selangor, Malaysia
| | - Muskhazli Mustafa
- Department of Biology, Faculty of Science, Universiti Putra Malaysia, 43400, UPM Serdang, Selangor, Malaysia
| | - Nurrul Shaqinah Nasruddin
- Centre for Craniofacial Diagnostics and Biosciences, Faculty of Dentistry, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300, Kuala Lumpur, Malaysia
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Zhao J, Li X, Hou X, Quan C, Chen M. Widespread Existence of Quorum Sensing Inhibitors in Marine Bacteria: Potential Drugs to Combat Pathogens with Novel Strategies. Mar Drugs 2019; 17:md17050275. [PMID: 31072008 PMCID: PMC6562741 DOI: 10.3390/md17050275] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 04/28/2019] [Accepted: 04/29/2019] [Indexed: 12/22/2022] Open
Abstract
Quorum sensing (QS) is a phenomenon of intercellular communication discovered mainly in bacteria. A QS system consisting of QS signal molecules and regulatory protein components could control physiological behaviors and virulence gene expression of bacterial pathogens. Therefore, QS inhibition could be a novel strategy to combat pathogens and related diseases. QS inhibitors (QSIs), mainly categorized into small chemical molecules and quorum quenching enzymes, could be extracted from diverse sources in marine environment and terrestrial environment. With the focus on the exploitation of marine resources in recent years, more and more QSIs from the marine environment have been investigated. In this article, we present a comprehensive review of QSIs from marine bacteria. Firstly, screening work of marine bacteria with potential QSIs was concluded and these marine bacteria were classified. Afterwards, two categories of marine bacteria-derived QSIs were summarized from the aspects of sources, structures, QS inhibition mechanisms, environmental tolerance, effects/applications, etc. Next, structural modification of natural small molecule QSIs for future drug development was discussed. Finally, potential applications of QSIs from marine bacteria in human healthcare, aquaculture, crop cultivation, etc. were elucidated, indicating promising and extensive application perspectives of QS disruption as a novel antimicrobial strategy.
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Affiliation(s)
- Jing Zhao
- Key Laboratory of Biotechnology and Bioresources Utilization (Dalian Minzu University), Ministry of Education, Dalian 116600, China.
- College of Life Science, Dalian Minzu University, Dalian 116600, China.
| | - Xinyun Li
- Key Laboratory of Biotechnology and Bioresources Utilization (Dalian Minzu University), Ministry of Education, Dalian 116600, China.
- College of Life Science, Dalian Minzu University, Dalian 116600, China.
| | - Xiyan Hou
- Key Laboratory of Biotechnology and Bioresources Utilization (Dalian Minzu University), Ministry of Education, Dalian 116600, China.
- College of Life Science, Dalian Minzu University, Dalian 116600, China.
| | - Chunshan Quan
- Key Laboratory of Biotechnology and Bioresources Utilization (Dalian Minzu University), Ministry of Education, Dalian 116600, China.
- College of Life Science, Dalian Minzu University, Dalian 116600, China.
| | - Ming Chen
- School of Biological Engineering, Dalian Polytechnic University, Dalian 116600, China.
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Reina JC, Torres M, Llamas I. Stenotrophomonas maltophilia AHL-Degrading Strains Isolated from Marine Invertebrate Microbiota Attenuate the Virulence of Pectobacterium carotovorum and Vibrio coralliilyticus. MARINE BIOTECHNOLOGY (NEW YORK, N.Y.) 2019; 21:276-290. [PMID: 30762152 DOI: 10.1007/s10126-019-09879-w] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Accepted: 01/21/2019] [Indexed: 06/09/2023]
Abstract
Many Gram-negative aquacultural and agricultural pathogens control virulence factor expression through a quorum-sensing (QS) mechanism involving the production of N-acylhomoserine (AHL) signalling molecules. Thus, the interruption of QS systems by the enzymatic degradation of signalling molecules, known as quorum quenching (QQ), has been proposed as a novel strategy to combat these infections. Given that the symbiotic bacteria of marine invertebrates are considered to be an important source of new bioactive molecules, this study explores the presence of AHL-degrading bacteria among 827 strains previously isolated from the microbiota of anemones and holothurians. Four of these strains (M3-1, M1-14, M3-13 and M9-54-2), belonging to the species Stenotrophomonas maltophilia, were selected on the basis of their ability to degrade a broad range of AHLs, and the enzymes involved in their activity were identified. Strain M9-54-2, which showed the strongest AHL-degrading activity, was selected for further study. High-performance liquid chromatography-mass-spectrometry confirmed that the QQ enzyme is not a lactonase. Strain M9-54-2 degraded AHL accumulation and reduced the production of enzymatic activity in Pectobacterium carotovorum CECT 225T and Vibrio coralliilyticus VibC-Oc-193 in in vitro co-cultivation experiments. The effect of AHL inactivation was confirmed by a reduction in potato tuber maceration and brine shrimp (Artemia salina) mortality caused by P. carotovorum and Vibrio coralliilyticus, respectively. This study strengthens the evidence of marine organisms as an underexplored and promising source of QQ enzymes, useful to prevent infections in aquaculture and agriculture. To our knowledge, this is the first time that anemones and holothurians have been studied for this purpose.
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Affiliation(s)
- José Carlos Reina
- Department of Microbiology, Faculty of Pharmacy, University of Granada, 18071, Granada, Spain
| | - Marta Torres
- Department of Microbiology, Faculty of Pharmacy, University of Granada, 18071, Granada, Spain
- Institute of Biotechnology, Biomedical Research Center (CIBM), University of Granada, 18071, Granada, Spain
- Institute for Integrative Biology of the Cell, CEA, CNRS, University Paris-Sud, University Paris-Saclay, Gif sur Yvette, France
| | - Inmaculada Llamas
- Department of Microbiology, Faculty of Pharmacy, University of Granada, 18071, Granada, Spain.
- Institute of Biotechnology, Biomedical Research Center (CIBM), University of Granada, 18071, Granada, Spain.
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Torres M, Dessaux Y, Llamas I. Saline Environments as a Source of Potential Quorum Sensing Disruptors to Control Bacterial Infections: A Review. Mar Drugs 2019; 17:md17030191. [PMID: 30934619 PMCID: PMC6471967 DOI: 10.3390/md17030191] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Revised: 03/19/2019] [Accepted: 03/20/2019] [Indexed: 12/12/2022] Open
Abstract
Saline environments, such as marine and hypersaline habitats, are widely distributed around the world. They include sea waters, saline lakes, solar salterns, or hypersaline soils. The bacteria that live in these habitats produce and develop unique bioactive molecules and physiological pathways to cope with the stress conditions generated by these environments. They have been described to produce compounds with properties that differ from those found in non-saline habitats. In the last decades, the ability to disrupt quorum-sensing (QS) intercellular communication systems has been identified in many marine organisms, including bacteria. The two main mechanisms of QS interference, i.e., quorum sensing inhibition (QSI) and quorum quenching (QQ), appear to be a more frequent phenomenon in marine aquatic environments than in soils. However, data concerning bacteria from hypersaline habitats is scarce. Salt-tolerant QSI compounds and QQ enzymes may be of interest to interfere with QS-regulated bacterial functions, including virulence, in sectors such as aquaculture or agriculture where salinity is a serious environmental issue. This review provides a global overview of the main works related to QS interruption in saline environments as well as the derived biotechnological applications.
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Affiliation(s)
- Marta Torres
- Department of Microbiology, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain.
- Institute of Biotechnology, Biomedical Research Center (CIBM), University of Granada, 18100 Granada, Spain.
- Institute for Integrative Biology of the Cell (I2BC), CEA/CNRS/University Paris-Sud, University Paris-Saclay, 91198 Gif-sur-Yvette, France.
| | - Yves Dessaux
- Institute for Integrative Biology of the Cell (I2BC), CEA/CNRS/University Paris-Sud, University Paris-Saclay, 91198 Gif-sur-Yvette, France.
| | - Inmaculada Llamas
- Department of Microbiology, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain.
- Institute of Biotechnology, Biomedical Research Center (CIBM), University of Granada, 18100 Granada, Spain.
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Zvarych V, Nakonechna A, Marchenko M, Khudyi O, Lubenets V, Khuda L, Kushniryk O, Novikov V. Hydrogen Peroxide Oxygenation of Furan-2-carbaldehyde via an Easy, Green Method. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2019; 67:3114-3117. [PMID: 30811195 DOI: 10.1021/acs.jafc.8b06284] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Derivatives of 2(5 H)-furanone (γ-crotonolactone) are important intermediate synthetic products with a wide range of biological effects that have become widely used in the pharmaceutical industry, medicine, and veterinary medicine, in particular in the prevention and treatment of fish diseases. However, the environmental issue of obtaining these compounds while reducing the negative impact on the surrounding environment remains relevant. This article describes for the first time a method of γ-crotonolactone synthesis that is based on the concept of green chemistry. Synthesis is carried out under mild conditions using nontoxic reagents by furfural oxidation. For the first time, a mixture of hydrogen peroxide and acetic acid was used for the oxidation of furfural in a ratio of 1:0.05. A mixture of organic acids (succinic, maleic, fumaric, formic, and cinnamic acids), obtained as a byproduct in the synthesis of γ-crotonolactone, can be used as a highly effective, ecofriendly organic fertilizer or in a preparation with a stimulating effect.
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Affiliation(s)
- Viktor Zvarych
- Department of Technology of Biologically Active Substances, Pharmacy and Biotechnology , Lviv Polytechnic National University , Stepan Bandera Street 12 , Lviv 79013 , Ukraine
| | - Anna Nakonechna
- Department of Technology of Biologically Active Substances, Pharmacy and Biotechnology , Lviv Polytechnic National University , Stepan Bandera Street 12 , Lviv 79013 , Ukraine
| | - Mykhailo Marchenko
- Department of Biochemistry and Biotechnology , Yuriy Fedkovych Chernivtsi National University , Kotsyubynsky Street 2 , Chernivtsi 58012 , Ukraine
| | - Oleksii Khudyi
- Department of Biochemistry and Biotechnology , Yuriy Fedkovych Chernivtsi National University , Kotsyubynsky Street 2 , Chernivtsi 58012 , Ukraine
| | - Vira Lubenets
- Department of Technology of Biologically Active Substances, Pharmacy and Biotechnology , Lviv Polytechnic National University , Stepan Bandera Street 12 , Lviv 79013 , Ukraine
| | - Lidiia Khuda
- Department of Biochemistry and Biotechnology , Yuriy Fedkovych Chernivtsi National University , Kotsyubynsky Street 2 , Chernivtsi 58012 , Ukraine
| | - Olga Kushniryk
- Department of Biochemistry and Biotechnology , Yuriy Fedkovych Chernivtsi National University , Kotsyubynsky Street 2 , Chernivtsi 58012 , Ukraine
| | - Volodymyr Novikov
- Department of Technology of Biologically Active Substances, Pharmacy and Biotechnology , Lviv Polytechnic National University , Stepan Bandera Street 12 , Lviv 79013 , Ukraine
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Li Y, Zhao J, Quan C, Jin L, Xu Y, Chen M. Production, characterization, and powder preparation of quorum quenching acylase AiiO for pathogen control. Prep Biochem Biotechnol 2019; 49:151-157. [PMID: 30712466 DOI: 10.1080/10826068.2018.1550657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Acylase AiiO is a novel quorum quenching enzyme with a broad substrate spectrum of acyl-homoserine lactones (AHLs) and has promising prospects in pathogen control. In this work, acylase AiiO production by a recombinant E. coli strain and its characterization were investigated; the acylase powder was further prepared and evaluated for effectiveness. A strategy of auto-induction combined with temperature regulation was developed to improve AiiO production. For the soluble AiiO protein in the cells, maximum production of 214.3 ± 9.4 mg/L was obtained in the fermenter. The purified acylase displayed an obvious AHL-degrading specific activity of 19.2 ± 0.56 U/mg. Sucrose, as the protective agent, maintained good stability of the acylase powder, in which the acylase remained 89.6 and 71.9% of its initial specific activity after storage at 4 °C for 3 and 6 months, respectively. The acylase powder could prominently decrease the expression levels of virulence-related factors of Pseudomonas aeruginosa. Based on the high-yield production and effective powder preparation, the quorum quenching acylase AiiO has the potential to be used in the clinical treatments of pathogenic infections.
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Affiliation(s)
- Yue Li
- a School of Biological Engineering, Dalian Polytechnic University , Dalian , China
| | - Jing Zhao
- b Key Laboratory of Biotechnology and Bioresources Utilization (Dalian Minzu University) , Ministry of Education , Dalian , China.,c College of Life Science , Dalian Minzu University , Dalian , China
| | - Chunshan Quan
- b Key Laboratory of Biotechnology and Bioresources Utilization (Dalian Minzu University) , Ministry of Education , Dalian , China.,c College of Life Science , Dalian Minzu University , Dalian , China
| | - Liming Jin
- b Key Laboratory of Biotechnology and Bioresources Utilization (Dalian Minzu University) , Ministry of Education , Dalian , China.,c College of Life Science , Dalian Minzu University , Dalian , China
| | - Yongbin Xu
- b Key Laboratory of Biotechnology and Bioresources Utilization (Dalian Minzu University) , Ministry of Education , Dalian , China.,c College of Life Science , Dalian Minzu University , Dalian , China
| | - Ming Chen
- a School of Biological Engineering, Dalian Polytechnic University , Dalian , China
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Torabi Delshad S, Soltanian S, Sharifiyazdi H, Bossier P. Effect of quorum quenching bacteria on growth, virulence factors and biofilm formation of Yersinia ruckeri in vitro and an in vivo evaluation of their probiotic effect in rainbow trout. JOURNAL OF FISH DISEASES 2018; 41:1429-1438. [PMID: 30014501 DOI: 10.1111/jfd.12840] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 05/21/2018] [Accepted: 05/22/2018] [Indexed: 06/08/2023]
Abstract
Five N-acyl homoserine lactone-degrading bacteria (quorum quenching (QQ) strains) were selected to evaluate their impacts on growth, virulence factors and biofilm formation in Yersinia ruckeri in vitro. No difference was observed among the growth pattern of Y. ruckeri in monoculture and coculture with the QQ strains. To investigate the regulation of virulence factors by quorum sensing in Y. ruckeri, cultures were supplemented with 3oxo-C8-HSL. The results indicated that swimming motility and biofilm formation are positively regulated by QS (p < 0.05), whereas caseinase, phospholipase and haemolysin productions are not influenced by 3oxo-C8-HSL (p > 0.05). The QQs were able to decrease swimming motility and biofilm formation in Y. ruckeri. QQ bacteria were supplemented to trout feed at 108 CFU/g (for 40 days). Their probiotic effect was verified by Y. ruckeri challenge either by immersion or injection in trout. All strains could significantly increase fish survival with Bacillus thuringiensis and Citrobacter gillenii showing the highest and lowest relative percentage survival (RPS) values (respectively, 85% and 38%). Besides, there was no difference between the RPS values by either immersion or injection challenge expect for B. thuringiensis. The putative involvement of the QQ capacity in the protection against Yersinia is discussed.
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Affiliation(s)
- Somayeh Torabi Delshad
- Department of Aquatic Animal Health and Diseases, School of Veterinary Medicine, Shiraz University, Shiraz, Iran
- Laboratory of Aquaculture and Artemia Reference Center, Department of Animal Production, Ghent University, Ghent, Belgium
| | - Siyavash Soltanian
- Department of Aquatic Animal Health and Diseases, School of Veterinary Medicine, Shiraz University, Shiraz, Iran
| | - Hassan Sharifiyazdi
- Department of Clinical Sciences, School of Veterinary Medicine, Shiraz University, Shiraz, Iran
| | - Peter Bossier
- Laboratory of Aquaculture and Artemia Reference Center, Department of Animal Production, Ghent University, Ghent, Belgium
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Pastore M, Sforza E. Exploiting symbiotic interactions between Chlorella protothecoides and Brevundimonas diminuta for an efficient single-step urban wastewater treatment. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2018; 78:216-224. [PMID: 30101804 DOI: 10.2166/wst.2018.155] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The application of microalgal bacteria consortia to the treatment of wastewater is receiving increasing attention, meeting the demand for new green and efficient technologies for water remediation. The specificity of the consortium, however, may strongly affect the performance of the treatment. In fact, even though a general exploitation of the O2/CO2 exchange between microalgae and bacteria is effective, some specific interactions may increase the pollutant removal. With this aim, the co-cultivation of Chlorella protothecoides and Brevundimonas diminuta was tested, with particular attention to the removal capability of nitrogen, phosphorus and chemical oxygen demand (COD) from wastewater. Batch experiments were carried out both for the consortium and, separately, for the bacteria and microalgae alone, in order to compare their performances. B. diminuta showed a remarkable capability for removing organic substances and transforming organic nitrogen to ammonium. C. protothecoides efficiently removed nitrogen and phosphorus. As the specific growth rates of the two organisms are different, the co-cultivation was also carried out also in a continuous system, and the effect of hydraulic retention time (HRT) on the steady-state biomass concentration and nutrient removal efficiency was verified. Residence time was found as the main operating variable for obtaining a significant reduction of pollutants from wastewater.
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Affiliation(s)
- Martina Pastore
- Interdepartmental Centre Giorgio Levi Cases, Via Marzolo 9, 35131 Padova, Italy E-mail:
| | - Eleonora Sforza
- Interdepartmental Centre Giorgio Levi Cases, Via Marzolo 9, 35131 Padova, Italy E-mail: ; Department of Industrial Engineering DII, University of Padova, Via Marzolo 9, 35131 Padova, Italy
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Rehman ZU, Leiknes T. Quorum-Quenching Bacteria Isolated From Red Sea Sediments Reduce Biofilm Formation by Pseudomonas aeruginosa. Front Microbiol 2018; 9:1354. [PMID: 30065702 PMCID: PMC6057113 DOI: 10.3389/fmicb.2018.01354] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2017] [Accepted: 06/05/2018] [Indexed: 12/15/2022] Open
Abstract
Quorum sensing (QS) is the process by which bacteria communicate with each other through small signaling molecules such as N-acylhomoserine lactones (AHLs). Certain bacteria can degrade AHL molecules by a process called quorum quenching (QQ); therefore, QQ can be used to control bacterial infections and biofilm formation. In this study, we aimed to identify new species of bacteria with QQ activity. Red Sea sediments were collected either from the close vicinity of seagrass or from areas with no vegetation. We isolated 72 bacterial strains, which were tested for their ability to degrade/inactivate AHL molecules. Chromobacterium violaceum CV026-based bioassay was used for the initial screening of isolates with QQ activity. QQ activity was further quantified using high-performance liquid chromatography-tandem mass spectrometry. We found that these isolates could degrade AHL molecules of different acyl chain lengths as well as modifications. 16S-rRNA sequencing of positive QQ isolates showed that they belonged to three different genera. Specifically, two isolates belonged to the genus Erythrobacter; four, Labrenzia; and one, Bacterioplanes. The genome of one representative isolate from each genus was sequenced, and potential QQ enzymes, namely, lactonases and acylases, were identified. The ability of these isolates to degrade the 3OXOC12-AHLs produced by Pseudomonas aeruginosa PAO1 and hence inhibit biofilm formation was investigated. Our results showed that the isolate VG12 (genus Labrenzia) is better than other isolates at controlling biofilm formation by PAO1 and degradation of different AHL molecules. Time-course experiments to study AHL degradation showed that VG1 (genus Erythrobacter) could degrade AHLs faster than other isolates. Thus, QQ bacteria or enzymes can be used in combination with an antibacterial to overcome antibiotic resistance.
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Affiliation(s)
- Zahid Ur Rehman
- Water Desalination and Reuse Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - TorOve Leiknes
- Water Desalination and Reuse Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
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32
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Diversity and antimicrobial potential in sea anemone and holothurian microbiomes. PLoS One 2018; 13:e0196178. [PMID: 29742123 PMCID: PMC5942802 DOI: 10.1371/journal.pone.0196178] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Accepted: 04/06/2018] [Indexed: 02/06/2023] Open
Abstract
Marine invertebrates, as holobionts, contain symbiotic bacteria that coevolve and develop antimicrobial substances. These symbiotic bacteria are an underexplored source of new bioactive molecules to face the emerging antibiotic resistance in pathogens. Here, we explored the antimicrobial activity of bacteria retrieved from the microbiota of two sea anemones (Anemonia sulcata, Actinia equina) and two holothurians (Holothuria tubulosa, Holothuria forskali). We tested the antimicrobial activity of the isolated bacteria against pathogens with interest for human health, agriculture and aquaculture. We isolated 27 strains with antibacterial activity and 12 of these isolates also showed antifungal activity. We taxonomically identified these strains being Bacillus and Vibrio species the most representative producers of antimicrobial substances. Microbiome species composition of the two sea anemones was similar between them but differed substantially of seawater bacteria. In contrast, microbiome species composition of the two holothurian species was different between them and in comparison with the bacteria in holothurian feces and seawater. In all the holobiont microbiomes Bacteroidetes was the predominant phylum. For each microbiome, we determined diversity and the rank-abundance dominance using five fitted models (null, pre-emption, log-Normal, Zipf and Zipf-Mandelbrot). The models with less evenness (i.e. Zipf and Zipf-Mandelblot) showed the best fits in all the microbiomes. Finally, we tracked (using the V4 hypervariable region of 16S rRNA gene) the relative abundance of these 27 isolates with antibacterial activity in the total pool of sequences obtained for the microbiome of each holobiont. Coincidences, although with extremely low frequencies, were detected only in the microbiome of H. forskali. This fact suggests that these isolated bacteria belong to the long tail of rare symbiotic bacteria. Therefore, more and more sophisticated culture techniques are necessary to explore this apparently vast pool of rare symbiontic bacteria and to determine their biotechnological potentiality.
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33
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The attachment potential and N-acyl-homoserine lactone-based quorum sensing in aerobic granular sludge and algal-bacterial granular sludge. Appl Microbiol Biotechnol 2018; 102:5343-5353. [DOI: 10.1007/s00253-018-9002-9] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Revised: 04/03/2018] [Accepted: 04/07/2018] [Indexed: 01/15/2023]
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Torres M, Reina JC, Fuentes-Monteverde JC, Fernández G, Rodríguez J, Jiménez C, Llamas I. AHL-lactonase expression in three marine emerging pathogenic Vibrio spp. reduces virulence and mortality in brine shrimp (Artemia salina) and Manila clam (Venerupis philippinarum). PLoS One 2018; 13:e0195176. [PMID: 29664914 PMCID: PMC5903640 DOI: 10.1371/journal.pone.0195176] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Accepted: 03/16/2018] [Indexed: 11/19/2022] Open
Abstract
Bacterial infectious diseases produced by Vibrio are the main cause of economic losses in aquaculture. During recent years it has been shown that the expression of virulence genes in some Vibrio species is controlled by a population-density dependent gene-expression mechanism known as quorum sensing (QS), which is mediated by the diffusion of signal molecules such as N-acylhomoserine lactones (AHLs). QS disruption, especially the enzymatic degradation of signalling molecules, known as quorum quenching (QQ), is one of the novel therapeutic strategies for the treatment of bacterial infections. In this study, we present the detection of AHLs in 34 marine Vibrionaceae strains. Three aquaculture-related pathogenic Vibrio strains, V. mediterranei VibC-Oc-097, V. owensii VibC-Oc-106 and V. coralliilyticus VibC-Oc-193 were selected for further studies based on their virulence and high production of AHLs. This is the first report where the signal molecules have been characterized in these emerging marine pathogens and correlated to the expression of virulence factors. Moreover, the results of AHL inactivation in the three selected strains have been confirmed in vivo against brine shrimps (Artemia salina) and Manila clams (Venerupis philippinarum). This research contributes to the development of future therapies based on AHL disruption, the most promising alternatives for fighting infectious diseases in aquaculture.
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Affiliation(s)
- Marta Torres
- Department of Microbiology, Faculty of Pharmacy, University of Granada, Granada, Spain
- Institute of Biotechnology, Biomedical Research Center (CIBM), University of Granada, Granada, Spain
| | - José Carlos Reina
- Department of Microbiology, Faculty of Pharmacy, University of Granada, Granada, Spain
| | - Juan Carlos Fuentes-Monteverde
- Department of Chemistry, Faculty of Sciences and Center for Advanced Scientific Research (CICA), University of A Coruña, A Coruña, Spain
| | - Gerardo Fernández
- Research Support Service (SAI), Central Services (ESCI) University of A Coruña, A Coruña, Spain
| | - Jaime Rodríguez
- Department of Chemistry, Faculty of Sciences and Center for Advanced Scientific Research (CICA), University of A Coruña, A Coruña, Spain
| | - Carlos Jiménez
- Department of Chemistry, Faculty of Sciences and Center for Advanced Scientific Research (CICA), University of A Coruña, A Coruña, Spain
| | - Inmaculada Llamas
- Department of Microbiology, Faculty of Pharmacy, University of Granada, Granada, Spain
- Institute of Biotechnology, Biomedical Research Center (CIBM), University of Granada, Granada, Spain
- * E-mail:
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35
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Dubert J, Barja JL, Romalde JL. New Insights into Pathogenic Vibrios Affecting Bivalves in Hatcheries: Present and Future Prospects. Front Microbiol 2017; 8:762. [PMID: 28515714 PMCID: PMC5413579 DOI: 10.3389/fmicb.2017.00762] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Accepted: 04/12/2017] [Indexed: 12/15/2022] Open
Abstract
Hatcheries constitute nowadays the only viable solution to support the husbandry of bivalve molluscs due to the depletion and/or overexploitation of their natural beds. Hatchery activities include the broodstock conditioning and spawning, rearing larvae and spat, and the production of microalgae to feed all stages of the production cycle. However, outbreaks of disease continue to be the main bottleneck for successful larval and spat production, most of them caused by different representatives of the genus Vibrio. Therefore, attention must be paid on preventive and management measures that allow the control of such undesirable bacterial populations. The present review provides an updated picture of the recently characterized Vibrio species associated with disease of bivalve molluscs during early stages of development, including the controversial taxonomic affiliation of some of them and relevant advances in the knowledge of their virulence determinants. The problematic use of antibiotics, as well as its eco-friendly alternatives are also critically discussed.
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Affiliation(s)
- Javier Dubert
- Departamento de Microbiología y Parasitología, CIBUS-Facultad de Biología, Universidade de Santiago de CompostelaSantiago de Compostela, Spain
| | - Juan L Barja
- Departamento de Microbiología y Parasitología, CIBUS-Facultad de Biología, Universidade de Santiago de CompostelaSantiago de Compostela, Spain
| | - Jesús L Romalde
- Departamento de Microbiología y Parasitología, CIBUS-Facultad de Biología, Universidade de Santiago de CompostelaSantiago de Compostela, Spain
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Zhou D, Zhang C, Fu L, Xu L, Cui X, Li Q, Crittenden JC. Responses of the Microalga Chlorophyta sp. to Bacterial Quorum Sensing Molecules (N-Acylhomoserine Lactones): Aromatic Protein-Induced Self-Aggregation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:3490-3498. [PMID: 28233977 DOI: 10.1021/acs.est.7b00355] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Bacteria and microalgae often coexist during the recycling of microalgal bioresources in wastewater treatment processes. Although the bacteria may compete with the microalgae for nutrients, they could also facilitate microalgal harvesting by forming algal-bacterial aggregates. However, very little is known about interspecies interactions between bacteria and microalgae. In this study, we investigated the responses of a model microalga, Chlorophyta sp., to the typical quorum sensing (QS) molecules N-acylhomoserine lactones (AHLs) extracted from activated sludge bacteria. Chlorophyta sp. self-aggregated in 200 μm bioflocs by secreting 460-1000 kDa aromatic proteins upon interacting with AHLs, and the settling efficiency of Chlorophyta sp. reached as high as 41%. However, Chlorophyta sp. cells were essentially in a free suspension in the absence of AHLs. Fluorescence intensity of the aromatic proteins had significant (P < 0.05) relationship with the Chlorophyta sp. settleability, and showed a positive correlation, indicating that aromatic proteins helped aggregate microalga. Transcriptome results further revealed up-regulation of synthesis pathways for aromatic proteins from tyrosine and phenylalanine that was assisted by anthranilate accumulation. To the best of our knowledge, this is the first study to confirm that eukaryotic microorganisms can sense and respond to prokaryotic QS molecules.
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Affiliation(s)
- Dandan Zhou
- School of Environment, Northeast Normal University , Changchun 130117, China
- Jilin Engineering Research Centre for Municipal Wastewater Treatment and Water Quality Protection, Changchun, 130117, China
| | - Chaofan Zhang
- School of Environment, Northeast Normal University , Changchun 130117, China
| | - Liang Fu
- School of Environment, Northeast Normal University , Changchun 130117, China
- Jilin Engineering Research Centre for Municipal Wastewater Treatment and Water Quality Protection, Changchun, 130117, China
| | - Liang Xu
- School of Environment, Northeast Normal University , Changchun 130117, China
- Jilin Engineering Research Centre for Municipal Wastewater Treatment and Water Quality Protection, Changchun, 130117, China
| | - Xiaochun Cui
- School of Environment, Northeast Normal University , Changchun 130117, China
| | - Qingcheng Li
- School of Environment, Northeast Normal University , Changchun 130117, China
| | - John C Crittenden
- School of Environment, Northeast Normal University , Changchun 130117, China
- Brook Byers Institute for Sustainable Systems, and School of Civil & Environmental Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
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Yaniv K, Golberg K, Kramarsky-Winter E, Marks R, Pushkarev A, Béjà O, Kushmaro A. Functional marine metagenomic screening for anti-quorum sensing and anti-biofilm activity. BIOFOULING 2017; 33:1-13. [PMID: 27882771 DOI: 10.1080/08927014.2016.1253684] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Accepted: 10/17/2016] [Indexed: 06/06/2023]
Abstract
Quorum sensing (QS), a cell-to-cell communication process, entails the production of signaling molecules that enable synchronized gene expression in microbial communities to regulate myriad microbial functions, including biofilm formation. QS disruption may constitute an innovative approach to the design of novel antifouling and anti-biofilm agents. To identify novel quorum sensing inhibitors (QSI), 2,500 environmental bacterial artificial chromosomes (BAC) from uncultured marine planktonic bacteria were screened for QSI activity using soft agar overlaid with wild type Chromobacterium violaceum as an indicator. Of the BAC library clones, 7% showed high QSI activity (>40%) against the indicator bacterium, suggesting that QSI is common in the marine environment. The most active compound, eluted from BAC clone 14-A5, disrupted QS signaling pathways and reduced biofilm formation in both Pseudomonas aeruginosa and Acinetobacter baumannii. The mass spectra of the active BAC clone (14-A5) that had been visualized by thin layer chromatography was dominated by a m/z peak of 362.1.
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Affiliation(s)
- Karin Yaniv
- a Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Faculty of Engineering Sciences , Ben-Gurion University of the Negev , Beer-Sheva , Israel
| | - Karina Golberg
- a Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Faculty of Engineering Sciences , Ben-Gurion University of the Negev , Beer-Sheva , Israel
| | - Esti Kramarsky-Winter
- a Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Faculty of Engineering Sciences , Ben-Gurion University of the Negev , Beer-Sheva , Israel
| | - Robert Marks
- a Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Faculty of Engineering Sciences , Ben-Gurion University of the Negev , Beer-Sheva , Israel
- b The Ilse Katz Center for Meso and Nanoscale Science and Technology , Ben-Gurion University of the Negev , Beer-Sheva , Israel
| | - Alina Pushkarev
- c Faculty of Biology , Technion-Israel Institute of Technology , Haifa , Israel
| | - Oded Béjà
- c Faculty of Biology , Technion-Israel Institute of Technology , Haifa , Israel
| | - Ariel Kushmaro
- a Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Faculty of Engineering Sciences , Ben-Gurion University of the Negev , Beer-Sheva , Israel
- b The Ilse Katz Center for Meso and Nanoscale Science and Technology , Ben-Gurion University of the Negev , Beer-Sheva , Israel
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Zhang S, Liu N, Liang W, Han Q, Zhang W, Li C. Quorum sensing-disrupting coumarin suppressing virulence phenotypes in Vibrio splendidus. Appl Microbiol Biotechnol 2016; 101:3371-3378. [PMID: 27942756 DOI: 10.1007/s00253-016-8009-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 11/06/2016] [Accepted: 11/09/2016] [Indexed: 11/27/2022]
Abstract
In the present study, the effects of an environmental friendly natural reagent coumarin, on the growth and potential virulence factors, as well as its ability to interfere the infection of Vibrio splendidus (Vs), were determined. Coumarin showed no effects on the maximal growth of Vs, and biofilm formation of Vs, while it significantly decreased protease activity and hemolytic activity by 43 and 80%, respectively. Correspondingly, coumarin exhibited an obviously protective effect, with a relative percent survival of 60% upon Apostichopus japonicus from infection by Vs. To preliminarily investigate the mechanism underlining the inhibitory effects, regulation of genes Vsm and Vsh respectively related to protease activity and hemolytic activity by supernatant and supernatant extract containing acyl-homoserine lactones (AHLs) and coumarin was determined. Cell-free supernatant from higher density and its ethyl acetate extract containing AHL signal molecules could respectively upregulate the mRNA level of Vsm by 17.4- and 2.3-fold and Vsh by 7.2- and 5.0-fold, when Vs was at lower cell density. However, coumarin could reduce the stimulatory effects of both the supernatant and its ethyl acetate extract. Combining all the results in our study, it was suggested that coumarin could be considered as an alternative to be used for controlling infection of Vs, downregulating the expression of potential virulence factors through interfering the AHL-mediated pathways.
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Affiliation(s)
- Shanshan Zhang
- School of Marine Sciences, Ningbo University, 818 Fenghua Road, Ningbo, Zhejiang Province, 315211, People's Republic of China
| | - Ningning Liu
- School of Marine Sciences, Ningbo University, 818 Fenghua Road, Ningbo, Zhejiang Province, 315211, People's Republic of China
| | - Weikang Liang
- School of Marine Sciences, Ningbo University, 818 Fenghua Road, Ningbo, Zhejiang Province, 315211, People's Republic of China
| | - Qingxi Han
- School of Marine Sciences, Ningbo University, 818 Fenghua Road, Ningbo, Zhejiang Province, 315211, People's Republic of China
| | - Weiwei Zhang
- School of Marine Sciences, Ningbo University, 818 Fenghua Road, Ningbo, Zhejiang Province, 315211, People's Republic of China.
| | - Chenghua Li
- School of Marine Sciences, Ningbo University, 818 Fenghua Road, Ningbo, Zhejiang Province, 315211, People's Republic of China.
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Profile of Citrobacter freundii ST2, a Multi-acyl-homoserine Lactone Producer Associated with Marine Dinoflagellates. Curr Microbiol 2016; 74:68-76. [PMID: 27807655 DOI: 10.1007/s00284-016-1155-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Accepted: 10/26/2016] [Indexed: 10/20/2022]
Abstract
Marine algae provide a unique niche termed the phycosphere for microorganism inhabitation. The phycosphere environment is an important niche for mutualistic and competitive interactions between algae and bacteria. Quorum sensing (QS) serves as a gene regulatory system in the microbial biosphere that allows bacteria to sense the population density with signaling molecules, such as acyl-homoserine lactone (AHL), and adapt their physiological activities to their surroundings. Understanding the QS system is important to elucidate the interactions between algal-associated microbial communities in the phycosphere condition. In this study, we isolated an epidermal bacterium (ST2) from the marine dinoflagellate Scrippsiella trochoidea and evaluated its AHL production profile. Strain ST2 was classified as a member of the genus Citrobacter closely related to Citrobacter freundii by 16S rRNA gene sequence analysis. Thin-layer chromatography revealed that C. freundii ST2 secreted three active AHL compounds into the culture supernatant. Specific compounds, such as N-butyryl-L-homoserine lactone (C4-AHL), N-octanoyl-DL-homoserine lactone (C8-AHL), and N-decanoyl-DL-homoserine lactone (C10-AHL), were identified by high-resolution tandem mass spectrometry. Carbon metabolic profiling with Biolog EcoPlate™ indicated that C. freundii ST2 was widely used as a carbon source and preferred carbohydrates, amino acids, and carboxylic acids as carbon substrates. Our results demonstrated that C. freundii ST2 is a multi-AHL producer that participates in the phycosphere carbon cycle.
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Kumar V, Zozaya-Valdes E, Kjelleberg S, Thomas T, Egan S. Multiple opportunistic pathogens can cause a bleaching disease in the red seaweed Delisea pulchra. Environ Microbiol 2016; 18:3962-3975. [PMID: 27337296 DOI: 10.1111/1462-2920.13403] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
While macroalgae (or seaweeds) are increasingly recognized to suffer from disease, in most cases the causative agents are unknown. The model macroalga Delisea pulchra is susceptible to a bleaching disease and previous work has identified two epiphytic bacteria, belonging to the Roseobacter clade, that cause bleaching under laboratory conditions. However, recent environmental surveys have shown that these in vitro pathogens are not abundant in naturally bleached D. pulchra, suggesting the presence of other pathogens capable of causing this algal disease. To test this hypothesis, we cultured bacteria that were abundant on bleached tissue across multiple disease events and assessed their ability to cause bleaching disease. We identified the new pathogens Alteromonas sp. BL110, Aquimarina sp. AD1 and BL5 and Agarivorans sp BL7 that are phylogenetically diverse, distinct from the previous two pathogens and can also be found in low abundance in healthy individuals. Moreover, we found that bacterial communities of diseased individuals that were infected with these pathogens were less diverse and more divergent from each other than those of healthy algae. This study demonstrates that multiple and opportunistic pathogens can cause the same disease outcome for D. pulchra and we postulate that such pathogens are more common in marine systems than previously anticipated.
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Affiliation(s)
- Vipra Kumar
- Centre for Marine Bio-Innovation & School of Biological, Earth and Environmental Sciences. The University of New South Wales Sydney, NSW, 2052, Australia
| | - Enrique Zozaya-Valdes
- Centre for Marine Bio-Innovation & School of Biological, Earth and Environmental Sciences. The University of New South Wales Sydney, NSW, 2052, Australia
| | - Staffan Kjelleberg
- Centre for Marine Bio-Innovation & School of Biological, Earth and Environmental Sciences. The University of New South Wales Sydney, NSW, 2052, Australia.,Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, 637551, Singapore
| | - Torsten Thomas
- Centre for Marine Bio-Innovation & School of Biological, Earth and Environmental Sciences. The University of New South Wales Sydney, NSW, 2052, Australia
| | - Suhelen Egan
- Centre for Marine Bio-Innovation & School of Biological, Earth and Environmental Sciences. The University of New South Wales Sydney, NSW, 2052, Australia
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41
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Fuentes JL, Garbayo I, Cuaresma M, Montero Z, González-Del-Valle M, Vílchez C. Impact of Microalgae-Bacteria Interactions on the Production of Algal Biomass and Associated Compounds. Mar Drugs 2016; 14:md14050100. [PMID: 27213407 PMCID: PMC4882574 DOI: 10.3390/md14050100] [Citation(s) in RCA: 144] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2016] [Revised: 05/09/2016] [Accepted: 05/10/2016] [Indexed: 12/29/2022] Open
Abstract
A greater insight on the control of the interactions between microalgae and other microorganisms, particularly bacteria, should be useful for enhancing the efficiency of microalgal biomass production and associated valuable compounds. Little attention has been paid to the controlled utilization of microalgae-bacteria consortia. However, the studies of microalgal-bacterial interactions have revealed a significant impact of the mutualistic or parasitic relationships on algal growth. The algal growth, for instance, has been shown to be enhanced by growth promoting factors produced by bacteria, such as indole-3-acetic acid. Vitamin B12 produced by bacteria in algal cultures and bacterial siderophores are also known to be involved in promoting faster microalgal growth. More interestingly, enhancement in the intracellular levels of carbohydrates, lipids and pigments of microalgae coupled with algal growth stimulation has also been reported. In this sense, massive algal production might occur in the presence of bacteria, and microalgae-bacteria interactions can be beneficial to the massive production of microalgae and algal products. This manuscript reviews the recent knowledge on the impact of the microalgae-bacteria interactions on the production of microalgae and accumulation of valuable compounds, with an emphasis on algal species having application in aquaculture.
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Affiliation(s)
- Juan Luis Fuentes
- Algal Biotechnology Group, Ciderta and Faculty of Sciences, University of Huelva and Marine International Campus of Excellence (CEIMAR), Huelva 21007, Spain.
| | - Inés Garbayo
- Algal Biotechnology Group, Ciderta and Faculty of Sciences, University of Huelva and Marine International Campus of Excellence (CEIMAR), Huelva 21007, Spain.
| | - María Cuaresma
- Algal Biotechnology Group, Ciderta and Faculty of Sciences, University of Huelva and Marine International Campus of Excellence (CEIMAR), Huelva 21007, Spain.
| | - Zaida Montero
- Algal Biotechnology Group, Ciderta and Faculty of Sciences, University of Huelva and Marine International Campus of Excellence (CEIMAR), Huelva 21007, Spain.
| | | | - Carlos Vílchez
- Algal Biotechnology Group, Ciderta and Faculty of Sciences, University of Huelva and Marine International Campus of Excellence (CEIMAR), Huelva 21007, Spain.
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42
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Torres M, Rubio-Portillo E, Antón J, Ramos-Esplá AA, Quesada E, Llamas I. Selection of the N-Acylhomoserine Lactone-Degrading Bacterium Alteromonas stellipolaris PQQ-42 and of Its Potential for Biocontrol in Aquaculture. Front Microbiol 2016; 7:646. [PMID: 27242684 PMCID: PMC4860449 DOI: 10.3389/fmicb.2016.00646] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Accepted: 04/18/2016] [Indexed: 12/26/2022] Open
Abstract
The production of virulence factors by many pathogenic microorganisms depends on the intercellular communication system called quorum sensing, which involves the production and release of signal molecules known as autoinducers. Based on this, new-therapeutic strategies have emerged for the treatment of a variety of infections, such as the enzymatic degradation of signaling molecules, known as quorum quenching (QQ). In this study, we present the screening of QQ activity amongst 450 strains isolated from a bivalve hatchery in Granada (Spain), and the selection of the strain PQQ-42, which degrades a wide range of N-acylhomoserine lactones (AHLs). The selected strain, identified as Alteromonas stellipolaris, degraded the accumulation of AHLs and reduced the production of protease and chitinase and swimming motility of a Vibrio species in co-cultivation experiments in vitro. In the bio-control experiment, strain PQQ-42 significantly reduced the pathogenicity of Vibrio mediterranei VibC-Oc-097 upon the coral Oculina patagonica showing a lower degree of tissue damage (29.25 ± 14.63%) in its presence, compared to when the coral was infected with V. mediterranei VibC-Oc-097 alone (77.53 ± 13.22%). Our results suggest that this AHL-degrading bacterium may have biotechnological applications in aquaculture.
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Affiliation(s)
- Marta Torres
- Faculty of Pharmacy, Department of Microbiology, University of GranadaGranada, Spain; Biomedical Research Centre (CIBM), Institute of Biotechnology, University of GranadaGranada, Spain
| | - Esther Rubio-Portillo
- Department of Marine Science and Applied Biology, University of Alicante Alicante, Spain
| | - Josefa Antón
- Department of Physiology, Genetics and Microbiology, University of Alicante Alicante, Spain
| | - Alfonso A Ramos-Esplá
- Department of Marine Science and Applied Biology, University of Alicante Alicante, Spain
| | - Emilia Quesada
- Faculty of Pharmacy, Department of Microbiology, University of GranadaGranada, Spain; Biomedical Research Centre (CIBM), Institute of Biotechnology, University of GranadaGranada, Spain
| | - Inmaculada Llamas
- Faculty of Pharmacy, Department of Microbiology, University of GranadaGranada, Spain; Biomedical Research Centre (CIBM), Institute of Biotechnology, University of GranadaGranada, Spain
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43
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Grandclément C, Tannières M, Moréra S, Dessaux Y, Faure D. Quorum quenching: role in nature and applied developments. FEMS Microbiol Rev 2015; 40:86-116. [PMID: 26432822 DOI: 10.1093/femsre/fuv038] [Citation(s) in RCA: 353] [Impact Index Per Article: 39.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/21/2015] [Indexed: 12/11/2022] Open
Abstract
Quorum sensing (QS) refers to the capacity of bacteria to monitor their population density and regulate gene expression accordingly: the QS-regulated processes deal with multicellular behaviors (e.g. growth and development of biofilm), horizontal gene transfer and host-microbe (symbiosis and pathogenesis) and microbe-microbe interactions. QS signaling requires the synthesis, exchange and perception of bacterial compounds, called autoinducers or QS signals (e.g. N-acylhomoserine lactones). The disruption of QS signaling, also termed quorum quenching (QQ), encompasses very diverse phenomena and mechanisms which are presented and discussed in this review. First, we surveyed the QS-signal diversity and QS-associated responses for a better understanding of the targets of the QQ phenomena that organisms have naturally evolved and are currently actively investigated in applied perspectives. Next the mechanisms, targets and molecular actors associated with QS interference are presented, with a special emphasis on the description of natural QQ enzymes and chemicals acting as QS inhibitors. Selected QQ paradigms are detailed to exemplify the mechanisms and biological roles of QS inhibition in microbe-microbe and host-microbe interactions. Finally, some QQ strategies are presented as promising tools in different fields such as medicine, aquaculture, crop production and anti-biofouling area.
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Affiliation(s)
- Catherine Grandclément
- Institut for Integrative Biology of the Cell, Department of Microbiology, CNRS CEA Paris-Sud University, Saclay Plant Sciences, Avenue de la Terrasse, 91198 Gif-sur-Yvette cedex, France
| | - Mélanie Tannières
- Institut for Integrative Biology of the Cell, Department of Microbiology, CNRS CEA Paris-Sud University, Saclay Plant Sciences, Avenue de la Terrasse, 91198 Gif-sur-Yvette cedex, France
| | - Solange Moréra
- Institut for Integrative Biology of the Cell, Department of Structural Biology, CNRS CEA Paris-Sud University, Avenue de la Terrasse, 91198 Gif-sur-Yvette cedex, France
| | - Yves Dessaux
- Institut for Integrative Biology of the Cell, Department of Microbiology, CNRS CEA Paris-Sud University, Saclay Plant Sciences, Avenue de la Terrasse, 91198 Gif-sur-Yvette cedex, France
| | - Denis Faure
- Institut for Integrative Biology of the Cell, Department of Microbiology, CNRS CEA Paris-Sud University, Saclay Plant Sciences, Avenue de la Terrasse, 91198 Gif-sur-Yvette cedex, France
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Demuez M, González-Fernández C, Ballesteros M. Algicidal microorganisms and secreted algicides: New tools to induce microalgal cell disruption. Biotechnol Adv 2015; 33:1615-25. [PMID: 26303095 DOI: 10.1016/j.biotechadv.2015.08.003] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Revised: 08/11/2015] [Accepted: 08/15/2015] [Indexed: 11/29/2022]
Abstract
Cell disruption is one of the most critical steps affecting the economy and yields of biotechnological processes for producing biofuels from microalgae. Enzymatic cell disruption has shown competitive results compared to mechanical or chemical methods. However, the addition of enzymes implies an associated cost in the overall production process. Recent studies have employed algicidal microorganisms to perform enzymatic cell disruption and degradation of microalgae biomass in order to reduce this associated cost. Algicidal microorganisms induce microalgae growth inhibition, death and subsequent lysis. Secreted algicidal molecules and enzymes produced by bacteria, cyanobacteria, viruses and the microalga themselves that are capable of inducing algal death are classified, and the known modes of action are described along with insights into cell-to-cell interaction and communication. This review aims to provide information regarding microalgae degradation by microorganisms and secreted algicidal substances that would be useful for microalgae cell breakdown in biofuels production processes. A better understanding of algae-to-algae communication and the specific mechanisms of algal cell lysis is expected to be an important breakthrough for the broader application of algicidal microorganisms in biological cell disruption and the production of biofuels from microalgae biomass.
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Affiliation(s)
- Marie Demuez
- IMDEA Energy Institute, Biotechnological Processes for Energy Production Unit, Av. Ramón de la Sagra 3, 28935 Móstoles, Spain.
| | - Cristina González-Fernández
- IMDEA Energy Institute, Biotechnological Processes for Energy Production Unit, Av. Ramón de la Sagra 3, 28935 Móstoles, Spain.
| | - Mercedes Ballesteros
- IMDEA Energy Institute, Biotechnological Processes for Energy Production Unit, Av. Ramón de la Sagra 3, 28935 Móstoles, Spain; CIEMAT, Renewable Energy Division, Biofuels Unit, Av. Complutense 40, 28040 Madrid, Spain.
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45
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Mai T, Tintillier F, Lucasson A, Moriou C, Bonno E, Petek S, Magré K, Al Mourabit A, Saulnier D, Debitus C. Quorum sensing inhibitors from Leucetta chagosensis Dendy, 1863. Lett Appl Microbiol 2015; 61:311-7. [PMID: 26138555 DOI: 10.1111/lam.12461] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Revised: 06/20/2015] [Accepted: 06/20/2015] [Indexed: 12/29/2022]
Abstract
UNLABELLED Sponges are a rich source for investigation of bioactive small molecules. They have been mostly investigated for the search of new pharmacological models or therapeutic agents for the treatment of human diseases. Micro-organisms can also represent a virulent pathogen for marine invertebrates such as sponges, which need to protect themselves against these microbes. Sponges' self defence mechanisms involving dialogue molecules thus represent a pertinent research track for potent anti-infective and anti-biofilm activities such as quorum sensing inhibitors (QSIs). The investigation of the QSI crude extract of Leucetta chagosensis Dendy, 1863 led to the isolation of three new alkaloids, isonaamine D, di-isonaamidine A and leucettamine D, along with the known isonaamine A and isonaamidine A. Isonaamidine A and isonaamine D were identified as inhibitors of the three quorum sensing pathways of Vibrio harveyi (CAI-1, AI-2 and harveyi auto inducer), but isonaamidine A displayed the strongest activity on AI-2 biosensor. Both compounds are new examples of natural QSIs of V. harveyi. These results outline the importance of these secondary metabolites for their producing organisms themselves in their natural environment, as well as the potential of the marine resource for aquaculture needs. SIGNIFICANCE AND IMPACT OF THE STUDY A new type of quorum sensing inhibitors was isolated from the sponge Leucetta chagosensis. One of them inhibits strongly the AI-2 channel of Vibrio harveyi, a marine pathogen of special importance in aquaculture. The activity of five different related compounds, including three new natural products discovered there, was investigated leading to structure-activity relationships which are useful for the design of new quorum sensing inhibitors to control marine infectious pathogens.
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Affiliation(s)
- T Mai
- IRD, UMR241-EIO, Papeete, Tahiti, French Polynesia.,Centre de Recherche de Gif-sur-Yvette, Institut de Chimie des Substances Naturelles, CNRS, Gif-sur-Yvette Cedex, France
| | - F Tintillier
- IRD, UMR241-EIO, Papeete, Tahiti, French Polynesia
| | - A Lucasson
- IFREMER, UMR241-EIO, LABEX CORAIL, Taravao, Tahiti, French Polynesia
| | - C Moriou
- Centre de Recherche de Gif-sur-Yvette, Institut de Chimie des Substances Naturelles, CNRS, Gif-sur-Yvette Cedex, France
| | - E Bonno
- IRD, UMR241-EIO, Papeete, Tahiti, French Polynesia
| | - S Petek
- IRD, UMR241-EIO, Papeete, Tahiti, French Polynesia
| | - K Magré
- IFREMER, UMR241-EIO, LABEX CORAIL, Taravao, Tahiti, French Polynesia
| | - A Al Mourabit
- Centre de Recherche de Gif-sur-Yvette, Institut de Chimie des Substances Naturelles, CNRS, Gif-sur-Yvette Cedex, France
| | - D Saulnier
- IFREMER, UMR241-EIO, LABEX CORAIL, Taravao, Tahiti, French Polynesia
| | - C Debitus
- IRD, UMR241-EIO, Papeete, Tahiti, French Polynesia
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46
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Kusari P, Kusari S, Spiteller M, Kayser O. Implications of endophyte-plant crosstalk in light of quorum responses for plant biotechnology. Appl Microbiol Biotechnol 2015; 99:5383-90. [DOI: 10.1007/s00253-015-6660-8] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Revised: 04/28/2015] [Accepted: 04/30/2015] [Indexed: 11/30/2022]
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47
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Hansen H, Purohit AA, Leiros HKS, Johansen JA, Kellermann SJ, Bjelland AM, Willassen NP. The autoinducer synthases LuxI and AinS are responsible for temperature-dependent AHL production in the fish pathogen Aliivibrio salmonicida. BMC Microbiol 2015; 15:69. [PMID: 25886758 PMCID: PMC4377199 DOI: 10.1186/s12866-015-0402-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Accepted: 03/11/2015] [Indexed: 11/25/2022] Open
Abstract
Background Quorum sensing (QS) is a cell-to-cell communication system used by bacteria to regulate activities such as virulence, bioluminescence and biofilm formation. The most common QS signals in Gram-negative bacteria are N-acyl-homoserine lactones (AHLs). Aliivibrio salmonicida is the etiological agent of cold water vibriosis in Atlantic salmon, a disease which occurs mainly during seasons when the seawater is below 12°C. In this work we have constructed several mutants of A. salmonicida LFI1238 in order to study the LuxI/LuxR and AinS/AinR QS systems with respect to AHL production and biofilm formation. Results Using high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) we found that LuxI in A. salmonicida LFI1238 is responsible for producing seven of the different AHLs, whereas AinS is responsible for producing only one. The production of these various AHLs is dependent on both cell density and growth temperature. The AHLs were efficiently produced when wild type LFI1238 was grown at 6 or 12°C, however at 16°C AHL production decreased dramatically, and LFI1238 produced less than 5% of the maximum concentrations observed at 6°C. LitR, the master regulator of QS, was found to be a positive regulator of AinS-dependent AHL production, and to a lesser extent LuxI-dependent AHL production. This implies a connection between the two systems, and both systems were found to be involved in regulation of biofilm formation. Finally, inactivation of either luxR1 or luxR2 in the lux operon significantly reduced production of LuxI-produced AHLs. Conclusion LuxI and AinS are the autoinducer synthases responsible for the eight AHLs in A. salmonicida. AHL production is highly dependent on growth temperature, and a significant decrease was observed when the bacterium was grown at a temperature above its limit for disease outbreak. Numerous AHLs could offer the opportunity for fine-tuning responses to changes in the environment. Electronic supplementary material The online version of this article (doi:10.1186/s12866-015-0402-z) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Hilde Hansen
- Norwegian Structural Biology Centre and the Department of Chemistry, Faculty of Science and Technology, UiT The Arctic University of Norway, N-9037, Tromsø, Norway.
| | - Amit Anand Purohit
- Norwegian Structural Biology Centre and the Department of Chemistry, Faculty of Science and Technology, UiT The Arctic University of Norway, N-9037, Tromsø, Norway.
| | - Hanna-Kirsti S Leiros
- Norwegian Structural Biology Centre and the Department of Chemistry, Faculty of Science and Technology, UiT The Arctic University of Norway, N-9037, Tromsø, Norway.
| | - Jostein A Johansen
- Norwegian Structural Biology Centre and the Department of Chemistry, Faculty of Science and Technology, UiT The Arctic University of Norway, N-9037, Tromsø, Norway.
| | - Stefanie J Kellermann
- Norwegian Structural Biology Centre and the Department of Chemistry, Faculty of Science and Technology, UiT The Arctic University of Norway, N-9037, Tromsø, Norway. .,Current address: Department of Chemistry and Pharmacy, Institute of Biochemistry, University of Münster, Wilhelm-Klemm-Straße 2, 48149, Münster, Germany.
| | - Ane Mohn Bjelland
- Section for Microbiology, Immunology and Parasitology, Department of Food Safety and Infection Biology, Faculty of Veterinary Medicine and Biosciences, Norwegian University of Life Sciences, Akershus, Norway.
| | - Nils Peder Willassen
- Norwegian Structural Biology Centre and the Department of Chemistry, Faculty of Science and Technology, UiT The Arctic University of Norway, N-9037, Tromsø, Norway.
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48
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Microbial metabolism of quorum-sensing molecules acyl-homoserine lactones, γ-heptalactone and other lactones. Appl Microbiol Biotechnol 2014; 98:3401-12. [DOI: 10.1007/s00253-014-5518-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2013] [Revised: 12/30/2013] [Accepted: 01/03/2014] [Indexed: 10/25/2022]
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Haloperoxidase mediated quorum quenching by Nitzschia cf pellucida: study of the metabolization of N-acyl homoserine lactones by a benthic diatom. Mar Drugs 2014; 12:352-67. [PMID: 24445305 PMCID: PMC3917277 DOI: 10.3390/md12010352] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2013] [Revised: 12/16/2013] [Accepted: 12/23/2013] [Indexed: 12/28/2022] Open
Abstract
Diatoms are known to produce a variety of halogenated compounds, which were recently shown to have a role in allelopathic interactions between competing species. The production of these compounds is linked to haloperoxidase activity. This research, has shown that this system may also be involved in diatom-bacteria interactions via the H2O2 dependent inactivation of a type of quorum sensing (QS) molecule, i.e., N-β-ketoacylated homoserine lactones (AHLs), by a natural haloperoxidase system from the benthic diatom Nitzschia cf pellucida. The AHL degradation pathway towards corresponding halogenated derivatives was elucidated via HPLC-MS analysis and the synthesis of a broad series of novel halogenated AHL analogues as reference compounds. Furthermore, their biological activity as quorum sensing modulators was directly compared and evaluated against a series of naturally occurring β-keto-AHLs. It has been demonstrated that the loss of the QS activity results from the final cleavage of the halogenated N-acyl chain of the signal molecules.
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50
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Disruption of cell-to-cell signaling does not abolish the antagonism of Phaeobacter gallaeciensis toward the fish pathogen Vibrio anguillarum in algal systems. Appl Environ Microbiol 2013; 79:5414-7. [PMID: 23811510 DOI: 10.1128/aem.01436-13] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Quorum sensing (QS) regulates Phaeobacter gallaeciensis antagonism in broth systems; however, we demonstrate here that QS is not important for antagonism in algal cultures. QS mutants reduced Vibrio anguillarum to the same extent as the wild type. Consequently, a combination of probiotic Phaeobacter and QS inhibitors is a feasible strategy for aquaculture disease control.
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