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Brill A, Menagen B, Malach E, Zelinger E, Avnir D, Burdman S, Hayouka Z. Entrapment of antimicrobial compounds in a metal matrix for crop protection. Microb Biotechnol 2024; 17:e70005. [PMID: 39268832 PMCID: PMC11393771 DOI: 10.1111/1751-7915.70005] [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: 01/02/2024] [Accepted: 08/08/2024] [Indexed: 09/15/2024] Open
Abstract
Agricultural yields are often limited by damage caused by pathogenic microorganisms, including plant-pathogenic bacteria. The chemical control options to cope with bacterial diseases in agriculture are limited, predominantly relying on copper-based products. These compounds, however, possess limited efficacy. Therefore, there is an urgent need to develop novel technologies to manage bacterial plant diseases and reduce food loss. In this study, a new antimicrobial agent was developed using a doping method that entraps small bioactive organic molecules inside copper as the metal matrix. The food preservative agent lauroyl arginate ethyl ester (ethyl lauroyl arginate; LAE) was chosen as the doped organic compound. The new composites were termed LAE@[Cu]. Bactericidal assays against Acidovorax citrulli, a severe plant pathogen, revealed that LAE and copper in the composites possess a synergistic interaction as compared with each component individually. LAE@[Cu] composites were further characterised in terms of chemical properties and in planta assays demonstrated their potential for further development as crop protection agents.
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Affiliation(s)
- Aya Brill
- Institute of Biochemistry, Food Science and Nutrition, The Robert H. Smith Faculty of Agriculture, Food and EnvironmentThe Hebrew University of JerusalemRehovotIsrael
- Department of Plant Pathology and Microbiology, Institute of Environmental Sciences, The Robert H. Smith Faculty of Agriculture, Food and EnvironmentThe Hebrew University of JerusalemRehovotIsrael
| | - Barak Menagen
- Institute of ChemistryThe Hebrew University of JerusalemJerusalemIsrael
| | - Einav Malach
- Institute of Biochemistry, Food Science and Nutrition, The Robert H. Smith Faculty of Agriculture, Food and EnvironmentThe Hebrew University of JerusalemRehovotIsrael
| | - Einat Zelinger
- Interdepartmental Core Facility, Robert H. Smith Faculty of Agriculture, Food and EnvironmentThe Hebrew University of JerusalemRehovotIsrael
| | - David Avnir
- Institute of ChemistryThe Hebrew University of JerusalemJerusalemIsrael
| | - Saul Burdman
- Department of Plant Pathology and Microbiology, Institute of Environmental Sciences, The Robert H. Smith Faculty of Agriculture, Food and EnvironmentThe Hebrew University of JerusalemRehovotIsrael
| | - Zvi Hayouka
- Institute of Biochemistry, Food Science and Nutrition, The Robert H. Smith Faculty of Agriculture, Food and EnvironmentThe Hebrew University of JerusalemRehovotIsrael
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2
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Becerril R, Precone M, Nerin C. Antibiofilm activity of LAE (ethyl lauroyl arginate) against food-borne fungi and its application in polystyrene surface coating. Food Microbiol 2023; 113:104284. [PMID: 37098437 DOI: 10.1016/j.fm.2023.104284] [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: 12/21/2022] [Revised: 04/04/2023] [Accepted: 04/08/2023] [Indexed: 04/27/2023]
Abstract
Several filamentous fungi species as Fusarium oxysporum or Cladosporium sp. can form biofilms by themselves or by participating in polymicrobial biofilms with bacteria. However, despite the high impact of biofilm on the food industry and the high efforts done to control biofilm produced by bacteria in the food area, there has been little study of strategies to control fungal biofilm in this area. In this study, the antibiofilm activity of the safe antimicrobial compound ethyl lauroyl arginate (LAE) was investigated against food spoilage fungi (Cladosporium cladosporioides, Aspergillus ochraceus, Penicillium italicum, Botrytis cynerea and Fusarium oxyspoum). Finally, the efficacy of a varnish-based coating incorporating LAE and coated onto polystyrene microtiter plates has been evaluated as a strategy to reduce fungal biofilm formation. The results of the 2,3-bis-(2-metoxi-4-nitro-5-sulfofenil)-2H-tetrazoilo-5-carboxanilida (XTT) assay, which measure the biofilm metabolic activity of moulds, demonstrated that LAE reduced significantly the formation of fungal biofilm at concentrations from 6 to 25 mg/L. This reduction was confirmed by the micrographs obtained by scanning electronic microscopy (SEM). In addition, LAE also showed antifungal activity against established biofilms. Particularly, it reduced their metabolic activity and viability at concentrations from 6 to 25 mg/L according to results obtained in the XTT assay and observations made by confocal laser scanning microscopy (CLSM). Finally, active coating incorporating from 2% of LAE proved to reduce significantly the biofilm formation in C. cladosporioides, B. cynerea and F. oxyspoum according to the results obtained in the XTT assay. However, the released studies indicated that the retention of LAE in the coating should be improved to prolong their activity.
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Affiliation(s)
- R Becerril
- I3A-Aragón Institute of Engineering Research, University of Zaragoza, María de Luna 3, 50018, Zaragoza, Spain
| | - M Precone
- University of Bologna, Via Zamboni, 33, 40126, Bologna, BO, Italy
| | - C Nerin
- I3A-Aragón Institute of Engineering Research, University of Zaragoza, María de Luna 3, 50018, Zaragoza, Spain.
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3
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Ma Y, Ma Y, Chi L, Wang S, Zhang D, Xiang Q. Lauric arginate ethyl ester: An update on the antimicrobial potential and application in the food systems. Front Microbiol 2023; 14:1125808. [PMID: 36910208 PMCID: PMC9995605 DOI: 10.3389/fmicb.2023.1125808] [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: 12/16/2022] [Accepted: 02/03/2023] [Indexed: 02/25/2023] Open
Abstract
Lauric arginate ethyl ester (LAE), a cationic surfactant with low toxicity, displays excellent antimicrobial activity against a broad range of microorganisms. LAE has been approved as generally recognized as safe (GRAS) for widespread application in certain foods at a maximum concentration of 200 ppm. In this context, extensive research has been carried out on the application of LAE in food preservation for improving the microbiological safety and quality characteristics of various food products. This study aims to present a general review of recent research progress on the antimicrobial efficacy of LAE and its application in the food industry. It covers the physicochemical properties, antimicrobial efficacy of LAE, and the underlying mechanism of its action. This review also summarizes the application of LAE in various foods products as well as its influence on the nutritional and sensory properties of such foods. Additionally, the main factors influencing the antimicrobial efficacy of LAE are reviewed in this work, and combination strategies are provided to enhance the antimicrobial potency of LAE. Finally, the concluding remarks and possible recommendations for the future research are also presented in this review. In summary, LAE has the great potential application in the food industry. Overall, the present review intends to improve the application of LAE in food preservation.
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Affiliation(s)
- Yunfang Ma
- College of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou, China.,Henan Key Laboratory of Cold Chain Food Quality and Safety Control, Zhengzhou, China
| | - Yanqing Ma
- College of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou, China.,Henan Key Laboratory of Cold Chain Food Quality and Safety Control, Zhengzhou, China
| | - Lei Chi
- College of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou, China.,Henan Key Laboratory of Cold Chain Food Quality and Safety Control, Zhengzhou, China
| | - Shaodan Wang
- College of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou, China.,Henan Key Laboratory of Cold Chain Food Quality and Safety Control, Zhengzhou, China
| | - Dianhe Zhang
- College of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou, China.,Henan Key Laboratory of Cold Chain Food Quality and Safety Control, Zhengzhou, China
| | - Qisen Xiang
- College of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou, China.,Henan Key Laboratory of Cold Chain Food Quality and Safety Control, Zhengzhou, China
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4
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Ryu V, Chuesiang P, Ngo H, Ashby RD, Fan X. Sustainable bio-based antimicrobials derived from fatty acids: Synthesis, safety, and efficacy. Crit Rev Food Sci Nutr 2022; 64:5911-5923. [PMID: 36571149 DOI: 10.1080/10408398.2022.2160430] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Some conventional sanitizers and antibiotics used in food industry may be of concerns due to generation of toxic byproducts, impact on the environment, and the emergence of antibiotic resistance bacteria. Bio-based antimicrobials can be an alternative to conventional sanitizers since they are produced from renewable resources, and the bacterial resistance to these compounds is of less concern than those of currently used antibiotics. Among the bio-based antimicrobial compounds, those produced via either fermentation or chemical synthesis by covalently or electrovalently attaching specific moieties to the fatty acid have drawn attention in recent years. Disaccharide, arginine, vitamin B1, and phenolics are linked to fatty acids resulting in the production of sophorolipid, lauric arginate ethyl ester, thiamin dilauryl sulfate, and phenolic branched-chain fatty acid, respectively, all of which are reported to exhibit antimicrobial activity by targeting the cell membrane of the bacteria. Also, studies that applied these compounds as food preservatives by combining them with other compounds or treatments have been reviewed regarding extending the shelf life and inactivating foodborne pathogens of foods and food products. In addition, the phenolic branched-chain fatty acids, which are relatively new compounds compared to the others, are highlighted in this review.
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Affiliation(s)
- Victor Ryu
- USDA, ARS, Eastern Regional Research Center, Wyndmoor, PA, USA
| | - Piyanan Chuesiang
- Department of Food Technology, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Helen Ngo
- USDA, ARS, Eastern Regional Research Center, Wyndmoor, PA, USA
| | - Richard D Ashby
- USDA, ARS, Eastern Regional Research Center, Wyndmoor, PA, USA
| | - Xuetong Fan
- USDA, ARS, Eastern Regional Research Center, Wyndmoor, PA, USA
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5
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Gracia-Vallés N, Ruiz-Torrubia F, Mitchell SG, Nerín C, Silva F. Developing ethyl lauroyl arginate antimicrobial films to combat Listeria monocytogenes in cured ham. Food Control 2022. [DOI: 10.1016/j.foodcont.2022.109164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Ogbechi J, Huang YS, Clanchy FIL, Pantazi E, Topping LM, Darlington LG, Williams RO, Stone TW. Modulation of immune cell function, IDO expression and kynurenine production by the quorum sensor 2-heptyl-3-hydroxy-4-quinolone (PQS). Front Immunol 2022; 13:1001956. [PMID: 36389710 PMCID: PMC9650388 DOI: 10.3389/fimmu.2022.1001956] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Accepted: 10/05/2022] [Indexed: 12/29/2023] Open
Abstract
Many invasive micro-organisms produce 'quorum sensor' molecules which regulate colony expansion and may modulate host immune responses. We have examined the ability of Pseudomonas Quorum Sensor (PQS) to influence cytokine expression under conditions of inflammatory stress. The administration of PQS in vivo to mice with collagen-induced arthritis (CIA) increased the severity of disease. Blood and inflamed paws from treated mice had fewer regulatory T cells (Tregs) but normal numbers of Th17 cells. However, PQS (1μM) treatment of antigen-stimulated lymph node cells from collagen-immunised mice in vitro inhibited the differentiation of CD4+IFNγ+ cells, with less effect on CD4+IL-17+ cells and no change in CD4+FoxP3+Tregs. PQS also inhibited T cell activation by anti-CD3/anti-CD28 antibodies. PQS reduced murine macrophage polarisation and inhibited expression of IL1B and IL6 genes in murine macrophages and human THP-1 cells. In human monocyte-derived macrophages, IDO1 gene, protein and enzyme activity were all inhibited by exposure to PQS. TNF gene expression was inhibited in THP-1 cells but not murine macrophages, while LPS-induced TNF protein release was increased by high PQS concentrations. PQS is known to have iron scavenging activity and its suppression of cytokine release was abrogated by iron supplementation. Unexpectedly, PQS decreased the expression of indoleamine-2, 3-dioxygenase genes (IDO1 and IDO2), IDO1 protein expression and enzyme activity in mouse and human macrophages. This is consistent with evidence that IDO1 inhibition or deletion exacerbates arthritis, while kynurenine reduces its severity. It is suggested that the inhibition of IDO1 and cytokine expression may contribute to the quorum sensor and invasive actions of PQS.
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Affiliation(s)
- Joy Ogbechi
- The Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculo-skeletal Sciences (NDORMS), University of Oxford, Oxford, United Kingdom
| | - Yi-Shu Huang
- The Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculo-skeletal Sciences (NDORMS), University of Oxford, Oxford, United Kingdom
| | - Felix I. L. Clanchy
- The Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculo-skeletal Sciences (NDORMS), University of Oxford, Oxford, United Kingdom
| | - Eirini Pantazi
- The Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculo-skeletal Sciences (NDORMS), University of Oxford, Oxford, United Kingdom
| | - Louise M. Topping
- The Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculo-skeletal Sciences (NDORMS), University of Oxford, Oxford, United Kingdom
| | | | - Richard O. Williams
- The Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculo-skeletal Sciences (NDORMS), University of Oxford, Oxford, United Kingdom
| | - Trevor W. Stone
- The Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculo-skeletal Sciences (NDORMS), University of Oxford, Oxford, United Kingdom
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7
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Effects of Ethyl Lauroyl Arginate (LAE) on Biofilm Detachment: Shear Rate, Concentration, and Dosing Time. WATER 2022. [DOI: 10.3390/w14142158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Biofilm formation is one of the main obstacles in membrane treatment. The non-oxidizing biocide ethyl lauroyl arginate (LAE) is promising for mitigating biofilm development on membrane surfaces. However, the operating conditions of LAE and their impact on biofilm detachment are not comprehensively understood. In this study, a real-time in vitro flow cell system was utilized to observe biofilm dispersal caused by the shear rate, concentration, and treatment time of LAE. This confirmed that the biofilm was significantly reduced to 68.2% at a shear rate of 3.42 s−1 due to the increased physical lifting force. LAE exhibited two different mechanisms for bacterial inactivation and biofilm dispersal. Biofilms treated with LAE at sub-growth inhibitory concentrations for a longer time could effectively detach the biofilm formed on the surface of the glass slides, which can be attributed to the increased motility of microorganisms. However, a high concentration (i.e., bactericidal concentration) of LAE should be seriously considered because of the inactivated sessile bacteria and their residual debris remaining on the surface. This study sheds light on the effect of LAE on biofilm detachment and provides insights into biofouling mitigation during the membrane process.
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8
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The Iron-chelator, N,N'-bis (2-hydroxybenzyl) Ethylenediamine-N,N'-Diacetic acid is an Effective Colistin Adjunct against Clinical Strains of Biofilm-Dwelling Pseudomonas aeruginosa. Antibiotics (Basel) 2020; 9:antibiotics9040144. [PMID: 32230813 PMCID: PMC7235823 DOI: 10.3390/antibiotics9040144] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 03/23/2020] [Accepted: 03/25/2020] [Indexed: 02/07/2023] Open
Abstract
Targeting the iron requirement of Pseudomonas aeruginosa may be an effective adjunctive for conventional antibiotic treatment against biofilm-dwelling P. aeruginosa. We, therefore, assessed the anti-biofilm activity of N,N’-bis (2-hydroxybenzyl) ethylenediamine-N,N’-diacetic acid (HBED), which is a synthetic hexadentate iron chelator. The effect of HBED was studied using short-term (microtitre plate) and longer-term (flow-cell) biofilm models, under aerobic, anaerobic, and microaerobic (flow-cell) conditions and in combination with the polymyxin antibiotic colistimethate sodium (colistin). HBED was assessed against strains of P. aeruginosa from patients with cystic fibrosis and the reference strain PAO1. HBED inhibited growth and biofilm formation of all clinical strains under aerobic and anaerobic conditions, but inhibitory effects against PAO1 were predominantly exerted under anaerobic conditions. PA605, which is a clinical strain with a robust biofilm-forming phenotype, was selected for flow-cell studies. HBED significantly reduced biomass and surface coverage of PA605, and, combined with colistin, HBED significantly enhanced the microcolony killing effects of colistin to result in almost complete removal of the biofilm. HBED combined with colistin is highly effective in vitro against biofilms formed by clinical strains of P. aeruginosa.
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Ma Q, Davidson PM, Zhong Q. Properties and potential food applications of lauric arginate as a cationic antimicrobial. Int J Food Microbiol 2020; 315:108417. [DOI: 10.1016/j.ijfoodmicro.2019.108417] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Revised: 10/21/2019] [Accepted: 11/01/2019] [Indexed: 11/28/2022]
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10
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Garrido-Baserba M, Asvapathanagul P, Park HD, Kim TS, Baquero-Rodriguez GA, Olson BH, Rosso D. Impact of fouling on the decline of aeration efficiency under different operational conditions at WRRFs. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 639:248-257. [PMID: 29787908 DOI: 10.1016/j.scitotenv.2018.05.036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2018] [Revised: 05/02/2018] [Accepted: 05/03/2018] [Indexed: 06/08/2023]
Abstract
Biofilm formation influences the most energy-demanding process in the waste water treatment cycle. Biofilm growth on the surface of wastewater aeration diffusers in water resource recovery facilities (WRRFs) can increase the energy requirements up to 50% in less than 2 years. The impact of biofilms in aeration diffusers was quantified and assessed for first time using molecular tools (i.e., Energy-dispersive X-ray, Ra and RMS and Pyrosequencing) and state-of-the-art techniques (i.e., EPS quantification, Hydrophobicity and DNA quantification). To provide a better understanding and quantitative connections between biological activity and aeration energy efficiency, two replicates of the most common diffusers were installed and tested in two different operational conditions (higher and lower organic loading rate processes) during 15 months. Different scenarios and conditions provided for first time comprehensive understanding of the major factors contributing to diffuser fouling. The array of analysis suggested that higher loading conditions can promote specialized microbial populations to halve aeration efficiency parameters (i.e., αF) in comparison to lower loading conditions. Biofilms adapted to certain operational conditions can trigger changes in diffuser membrane properties (i.e., biological enhanced roughness and hydrophobicity) and enhance EPS growth rates. Improved understanding of the effects of scaling, biofouling, aging and microbial population shifts on the decrease in aeration efficiency is provided.
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Affiliation(s)
- Manel Garrido-Baserba
- Department of Civil & Environmental Engineering, University of California, Irvine, CA 92697-2175, USA.
| | - Pitiporn Asvapathanagul
- Department of Civil Engineering and Construction Engineering Management, California State University, Long Beach, CA 90840, USA
| | - Hee-Deung Park
- School of Civil, Environmental and Architectural Engineering, Korea University, Anam-Dong, Seongbuk-Gu, Seoul 136-713, Republic of Korea
| | - Taek-Seung Kim
- School of Civil, Environmental and Architectural Engineering, Korea University, Anam-Dong, Seongbuk-Gu, Seoul 136-713, Republic of Korea
| | - G Andres Baquero-Rodriguez
- Facultad de Ingeniería, Universidad Militar Nueva Granada, Sede Campus Nueva Granada, Km 2, vía Cajicá - Zipaquirá, Colombia
| | - Betty H Olson
- Department of Civil & Environmental Engineering, University of California, Irvine, CA 92697-2175, USA; Water-Energy Nexus Center, University of California, Irvine, CA 92697-2175, (USA)
| | - Diego Rosso
- Department of Civil & Environmental Engineering, University of California, Irvine, CA 92697-2175, USA; Water-Energy Nexus Center, University of California, Irvine, CA 92697-2175, (USA)
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Yan H, Wang M, Sun F, Dandekar AA, Shen D, Li N. A Metabolic Trade-Off Modulates Policing of Social Cheaters in Populations of Pseudomonas aeruginosa. Front Microbiol 2018. [PMID: 29535700 PMCID: PMC5835063 DOI: 10.3389/fmicb.2018.00337] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Pseudomonas aeruginosa uses quorum sensing (QS) to regulate the production of public goods such as the secreted protease elastase. P. aeruginosa requires the LasI-LasR QS circuit to induce elastase and enable growth on casein as the sole carbon and energy source. The LasI-LasR system also induces a second QS circuit, the RhlI-RhlR system. During growth on casein, LasR-mutant social cheaters emerge, and this can lead to a population collapse. In a minimal medium containing ammonium sulfate as a nitrogen source, populations do not collapse, and cheaters and cooperators reach a stable equilibrium; however, without ammonium sulfate, cheaters overtake the cooperators and populations collapse. We show that ammonium sulfate enhances the activity of the RhlI-RhlR system in casein medium and this leads to increased production of cyanide, which serves to control levels of cheaters. This enhancement of cyanide production occurs because of a trade-off in the metabolism of glycine: exogenous ammonium ion inhibits the transformation of glycine to 5,10-methylenetetrahydrofolate through a reduction in the expression of the glycine cleavage genes gcvP1 and gcvP2, thereby increasing the availability of glycine as a substrate for RhlR-regulated hydrogen cyanide synthesis. Thus, environmental ammonia enhances cyanide production and stabilizes QS in populations of P. aeruginosa.
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Affiliation(s)
- Huicong Yan
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, China
| | - Meizhen Wang
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, China.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou, China
| | - Feng Sun
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, China
| | - Ajai A Dandekar
- Department of Microbiology, University of Washington, Seattle, WA, United States.,Department of Medicine, University of Washington, Seattle, WA, United States
| | - Dongsheng Shen
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, China.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou, China
| | - Na Li
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, China.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou, China
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