1
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Kratou M, Maitre A, Abuin-Denis L, Piloto-Sardiñas E, Corona-Guerrero I, Cano-Argüelles AL, Wu-Chuang A, Bamgbose T, Almazan C, Mosqueda J, Obregón D, Mateos-Hernández L, Said MB, Cabezas-Cruz A. Disruption of bacterial interactions and community assembly in Babesia-infected Haemaphysalis longicornis following antibiotic treatment. BMC Microbiol 2024; 24:322. [PMID: 39237861 PMCID: PMC11378419 DOI: 10.1186/s12866-024-03468-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2024] [Accepted: 08/19/2024] [Indexed: 09/07/2024] Open
Abstract
BACKGROUND A previous study highlighted the role of antibiotic-induced dysbiosis in the tick microbiota, facilitating the transstadial transmission of Babesia microti from nymph to adult in Haemaphysalis longicornis. This study builds on previous findings by analyzing sequence data from an earlier study to investigate bacterial interactions that could be linked to enhanced transstadial transmission of Babesia in ticks. The study employed antibiotic-treated (AT) and control-treated (CT) Haemaphysalis longicornis ticks to investigate shifts in microbial community assembly. Network analysis techniques were utilized to assess bacterial interactions, comparing network centrality measures between AT and CT groups, alongside studying network robustness and connectivity loss. Additionally, functional profiling was conducted to evaluate metabolic diversity in response to antibiotic treatment. RESULTS The analysis revealed notable changes in microbial community assembly in response to antibiotic treatment. Antibiotic-treated (AT) ticks displayed a greater number of connected nodes but fewer correlations compared to control-treated (CT) ticks, indicating a less interactive yet more connected microbial community. Network centrality measures such as degree, betweenness, closeness, and eigenvector centrality, differed significantly between AT and CT groups, suggesting alterations in local network dynamics due to antibiotic intervention. Coxiella and Acinetobacter exhibited disrupted connectivity and roles, with the former showing reduced interactions in AT group and the latter displaying a loss of connected nodes, emphasizing their crucial roles in microbial network stability. Robustness tests against node removal showed decreased stability in AT networks, particularly under directed attacks, confirming a susceptibility of the microbial community to disturbances. Functional profile analysis further indicated a higher diversity and richness in metabolic capabilities in the AT group, reflecting potential shifts in microbial metabolism as a consequence of antimicrobial treatment. CONCLUSIONS Our findings support that bacterial interaction traits boosting the transstadial transmission of Babesia could be associated with reduced colonization resistance. The disrupted microbial interactions and decreased network robustness in AT ticks suggest critical vulnerabilities that could be targeted for managing tick-borne diseases.
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Affiliation(s)
- Myriam Kratou
- Laboratory of Microbiology, National School of Veterinary Medicine of Sidi Thabet, University of Manouba, Manouba, 2010, Tunisia.
| | - Apolline Maitre
- UMR BIPAR, Laboratoire de Santé Animale, ANSES, INRAE, Ecole Nationale Vétérinaire d'Alfort, Maisons-Alfort, 94700, France
- INRAE, UR 0045 Laboratoire de Recherches Sur Le Développement de L'Elevage (SELMET LRDE), Corte, France
- EA 7310, Laboratoire de Virologie, Université de Corse, Corte, France
| | - Lianet Abuin-Denis
- UMR BIPAR, Laboratoire de Santé Animale, ANSES, INRAE, Ecole Nationale Vétérinaire d'Alfort, Maisons-Alfort, 94700, France
- Animal Biotechnology Department, Center for Genetic Engineering and Biotechnology, P.O. Box 6162, Avenue 31 Between 158 and 190, Havana, 10600, Cuba
| | - Elianne Piloto-Sardiñas
- UMR BIPAR, Laboratoire de Santé Animale, ANSES, INRAE, Ecole Nationale Vétérinaire d'Alfort, Maisons-Alfort, 94700, France
- Direction of Animal Health, National Center for Animal and Plant Health, Carretera de Tapaste y Autopista Nacional, Apartado Postal 10, San José de Las Lajas, Mayabeque, 32700, Cuba
| | - Ivan Corona-Guerrero
- Immunology and Vaccines Laboratory, C. A. Facultad de Ciencias Naturales, Universidad Autónoma de Querétaro, Queretaro, Mexico
- C.A. Salud Animal y Microbiologia Ambiental. Facultad de Ciencias Naturales, Universidad Autonoma de Queretaro, Queretaro, Mexico
| | - Ana Laura Cano-Argüelles
- Parasitology Laboratory, Institute of Natural Resources and Agrobiology (IRNASA, CSIC), Cordel de Merinas, 40-52, Salamanca, 37008, Spain
| | - Alejandra Wu-Chuang
- UMR BIPAR, Laboratoire de Santé Animale, ANSES, INRAE, Ecole Nationale Vétérinaire d'Alfort, Maisons-Alfort, 94700, France
| | - Timothy Bamgbose
- Department of Biological Sciences, Microbiology Unit, Kings University, Odeomu, Osun State, Nigeria
- National Agency for Food and Drug Control and Administration (NAFDAC), Isolo, Lagos State, Nigeria
| | - Consuelo Almazan
- Immunology and Vaccines Laboratory, C. A. Facultad de Ciencias Naturales, Universidad Autónoma de Querétaro, Queretaro, Mexico
- C.A. Salud Animal y Microbiologia Ambiental. Facultad de Ciencias Naturales, Universidad Autonoma de Queretaro, Queretaro, Mexico
| | - Juan Mosqueda
- Immunology and Vaccines Laboratory, C. A. Facultad de Ciencias Naturales, Universidad Autónoma de Querétaro, Queretaro, Mexico
- C.A. Salud Animal y Microbiologia Ambiental. Facultad de Ciencias Naturales, Universidad Autonoma de Queretaro, Queretaro, Mexico
| | - Dasiel Obregón
- School of Environmental Sciences, University of Guelph, Guelph, ON, Canada
| | - Lourdes Mateos-Hernández
- UMR BIPAR, Laboratoire de Santé Animale, ANSES, INRAE, Ecole Nationale Vétérinaire d'Alfort, Maisons-Alfort, 94700, France
| | - Mourad Ben Said
- Laboratory of Microbiology, National School of Veterinary Medicine of Sidi Thabet, University of Manouba, Manouba, 2010, Tunisia
- Department of Basic Sciences, Higher Institute of Biotechnology of Sidi Thabet, University of Manouba, Manouba, 2010, Tunisia
| | - Alejandro Cabezas-Cruz
- UMR BIPAR, Laboratoire de Santé Animale, ANSES, INRAE, Ecole Nationale Vétérinaire d'Alfort, Maisons-Alfort, 94700, France.
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2
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Niggli S, Schwyter L, Poveda L, Grossmann J, Kümmerli R. Rapid and strain-specific resistance evolution of Staphylococcus aureus against inhibitory molecules secreted by Pseudomonas aeruginosa. mBio 2023; 14:e0315322. [PMID: 37646506 PMCID: PMC10653847 DOI: 10.1128/mbio.03153-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Accepted: 06/30/2023] [Indexed: 09/01/2023] Open
Abstract
IMPORTANCE Polymicrobial infections are common. In chronic infections, the different pathogens may repeatedly interact, which could spur evolutionary dynamics with pathogens adapting to one another. Here, we explore the potential of Staphylococcus aureus to adapt to its competitor Pseudomonas aeruginosa. These two pathogens frequently co-occur, and P. aeruginosa is seen as the dominant species being able to displace S. aureus. We studied three different S. aureus strains and found that all became quickly resistant to inhibitory compounds secreted by P. aeruginosa. Our experimental evolution revealed strains-specific adaptations with three main factors contributing to resistance evolution: (i) overproduction of staphyloxanthin, a molecule protecting from oxidative stress; (ii) the formation of small colony variants also protecting from oxidative stress; and (iii) alterations of membrane transporters possibly reducing toxin uptake. Our results show that species interactions can change over time potentially favoring species co-existence, which in turn could affect disease progression and treatment options.
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Affiliation(s)
- Selina Niggli
- Department of Quantitative Biomedicine, University of Zurich, Winterthurerstrasse, Zurich, Switzerland
| | - Lukas Schwyter
- Department of Quantitative Biomedicine, University of Zurich, Winterthurerstrasse, Zurich, Switzerland
| | - Lucy Poveda
- Functional Genomics Center Zurich, ETH Zurich and University of Zurich, Winterthurerstrasse, Zurich, Switzerland
- Swiss Institute of Bioinformatics (SIB) Quartier Sorge-Batiment Amphipole, Lausanne, Switzerland
| | - Jonas Grossmann
- Functional Genomics Center Zurich, ETH Zurich and University of Zurich, Winterthurerstrasse, Zurich, Switzerland
- Swiss Institute of Bioinformatics (SIB) Quartier Sorge-Batiment Amphipole, Lausanne, Switzerland
| | - Rolf Kümmerli
- Department of Quantitative Biomedicine, University of Zurich, Winterthurerstrasse, Zurich, Switzerland
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3
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Rossetto V, Moore-Machacek A, Woods DF, Galvão HM, Shanahan RM, Hickey A, O'Leary N, O'Gara F, McGlacken GP, Reen FJ. Structural modification of the Pseudomonas aeruginosa alkylquinoline cell-cell communication signal, HHQ, leads to benzofuranoquinolines with anti-virulence behaviour in ESKAPE pathogens. MICROBIOLOGY (READING, ENGLAND) 2023; 169. [PMID: 36862576 DOI: 10.1099/mic.0.001303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/03/2023]
Abstract
Microbial populations have evolved intricate networks of negotiation and communication through which they can coexist in natural and host ecosystems. The nature of these systems can be complex and they are, for the most part, poorly understood at the polymicrobial level. The Pseudomonas Quinolone Signal (PQS) and its precursor 4-hydroxy-2-heptylquinoline (HHQ) are signal molecules produced by the important nosocomial pathogen
Pseudomonas aeruginosa
. They are known to modulate the behaviour of co-colonizing bacterial and fungal pathogens such as Bacillus atropheaus, Candida albicans and Aspergillus fumigatus. While the structural basis for alkyl-quinolone signalling within
P. aeruginosa
has been studied extensively, less is known about how structural derivatives of these molecules can influence multicellular behaviour and population-level decision-making in other co-colonizing organisms. In this study, we investigated a suite of small molecules derived initially from the HHQ framework, for anti-virulence activity against ESKAPE pathogens, at the species and strain levels. Somewhat surprisingly, with appropriate substitution, loss of the alkyl chain (present in HHQ and PQS) did not result in a loss of activity, presenting a more easily accessible synthetic framework for investigation. Virulence profiling uncovered significant levels of inter-strain variation among the responses of clinical and environmental isolates to small-molecule challenge. While several lead compounds were identified in this study, further work is needed to appreciate the extent of strain-level tolerance to small-molecule anti-infectives among pathogenic organisms.
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Affiliation(s)
- Veronica Rossetto
- Faculty of Science and Technology, Universidade do Algarve, Algarve, Portugal.,School of Microbiology, University College Cork, Cork, Ireland
| | | | - David F Woods
- School of Microbiology, University College Cork, Cork, Ireland
| | - Helena M Galvão
- Faculty of Science and Technology, Universidade do Algarve, Algarve, Portugal
| | - Rachel M Shanahan
- School of Chemistry and Analytical and Biological Chemistry Research Facility, University College Cork, Cork, Ireland
| | - Aobha Hickey
- School of Chemistry and Analytical and Biological Chemistry Research Facility, University College Cork, Cork, Ireland
| | - Niall O'Leary
- School of Microbiology, University College Cork, Cork, Ireland
| | - Fergal O'Gara
- School of Microbiology, University College Cork, Cork, Ireland.,Biomerit Research Centre, School of Microbiology, University College Cork, Cork, Ireland.,Wal-yan Respiratory Research Centre, Telethon Kids Institute, Perth, WA, Australia
| | - Gerard P McGlacken
- School of Chemistry and Analytical and Biological Chemistry Research Facility, University College Cork, Cork, Ireland.,Synthesis and Solid State Pharmaceutical Centre, University College Cork, Cork, Ireland
| | - F Jerry Reen
- School of Microbiology, University College Cork, Cork, Ireland.,Synthesis and Solid State Pharmaceutical Centre, University College Cork, Cork, Ireland
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4
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Ishiai T, Subsomwong P, Narita K, Kawai N, Teng W, Suzuki S, Sukchawalit R, Nakane A, Asano K. Extracellular vesicles of Pseudomonas aeruginosa downregulate pyruvate fermentation enzymes and inhibit the initial growth of Staphylococcus aureus. CURRENT RESEARCH IN MICROBIAL SCIENCES 2023; 4:100190. [PMID: 37131486 PMCID: PMC10149184 DOI: 10.1016/j.crmicr.2023.100190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/04/2023] Open
Abstract
Staphylococcus aureus and Pseudomonas aeruginosa are well-known opportunistic pathogens that frequently coexist in chronic wounds and cystic fibrosis. The exoproducts of P. aeruginosa have been shown to affect the growth and pathogenicity of S. aureus, but the detailed mechanisms are not well understood. In this study, we investigated the effect of extracellular vesicles from P. aeruginosa (PaEVs) on the growth of S. aureus. We found that PaEVs inhibited the S. aureus growth independently of iron chelation and showed no bactericidal activity. This growth inhibitory effect was also observed with methicillin-resistant S. aureus but not with Acinetobacter baumannii, Enterococcus faecalis, S. Typhimurium, E. coli, Listeria monocytogenes, or Candida albicans, suggesting that the growth inhibitory effect of PaEVs is highly specific for S. aureus. To better understand the detailed mechanism, the difference in protein production of S. aureus between PaEV-treated and non-treated groups was further analyzed. The results revealed that lactate dehydrogenase 2 and formate acetyltransferase enzymes in the pyruvate fermentation pathway were significantly reduced after PaEV treatment. Likewise, the expression of ldh2 gene for lactate dehydrogenase 2 and pflB gene for formate acetyltransferase in S. aureus was reduced by PaEV treatment. In addition, this inhibitory effect of PaEVs was abolished by supplementation with pyruvate or oxygen. These results suggest that PaEVs inhibit the growth of S. aureus by suppressing the pyruvate fermentation pathway. This study reported a mechanism of PaEVs in inhibiting S. aureus growth which may be important for better management of S. aureus and P. aeruginosa co-infections.
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Affiliation(s)
- Takahito Ishiai
- Department of Microbiology and Immunology, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Phawinee Subsomwong
- Department of Microbiology and Immunology, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Kouj Narita
- Department of Microbiology and Immunology, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
- Institute for Animal Experimentation, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Noriaki Kawai
- Department of Microbiology and Immunology, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Wei Teng
- Department of Microbiology and Immunology, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Sachio Suzuki
- Department of Respiratory Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Rojana Sukchawalit
- Laboratory of Biotechnology, Chulabhorn Research Institute, Lak Si, Bangkok 10210, Thailand
| | - Akio Nakane
- Department of Biopolymer and Health Science, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 306-8562, Japan
| | - Krisana Asano
- Department of Microbiology and Immunology, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
- Department of Biopolymer and Health Science, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 306-8562, Japan
- Corresponding author at: Department of Microbiology and Immunology, Hirosaki University Graduate School of Medicine, 5 Zaifu-cho, Hirosaki, 036-8562, Japan.
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5
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Membrane-Binding Biomolecules Influence the Rate of Vesicle Exchange between Bacteria. Appl Environ Microbiol 2022; 88:e0134622. [PMID: 36342184 PMCID: PMC9746307 DOI: 10.1128/aem.01346-22] [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: 11/09/2022] Open
Abstract
The exchange of bacterial extracellular vesicles facilitates molecular exchange between cells, including the horizontal transfer of genetic material. Given the implications of such transfer events on cell physiology and adaptation, some bacterial cells have likely evolved mechanisms to regulate vesicle exchange. Past work has identified mechanisms that influence the formation of extracellular vesicles, including the production of small molecules that modulate membrane structure; however, whether these mechanisms also modulate vesicle uptake and have an overall impact on the rate of vesicle exchange is unknown. Here, we show that membrane-binding molecules produced by microbes influence both the formation and uptake of extracellular vesicles and have the overall impact of increasing the vesicle exchange rate within a bacterial coculture. In effect, production of compounds that increase vesicle exchange rates encourage gene exchange between neighboring cells. The ability of several membrane-binding compounds to increase vesicle exchange was demonstrated. Three of these compounds, nisin, colistin, and polymyxin B, are antimicrobial peptides added at sub-inhibitory concentrations. These results suggest that a potential function of exogenous compounds that bind to membranes may be the regulation of vesicle exchange between cells. IMPORTANCE The exchange of bacterial extracellular vesicles is one route of gene transfer between bacteria, although it was unclear if bacteria developed strategies to modulate the rate of gene transfer within vesicles. In eukaryotes, there are many examples of specialized molecules that have evolved to facilitate the production, loading, and uptake of vesicles. Recent work with bacteria has shown that some small molecules influence membrane curvature and induce vesicle formation. Here, we show that similar compounds facilitate vesicle uptake, thereby increasing the overall rate of vesicle exchange within bacterial populations. The addition of membrane-binding compounds, several of them antibiotics at subinhibitory concentrations, to a bacterial coculture increased the rate of horizontal gene transfer via vesicle exchange.
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6
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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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Sahreen S, Mukhtar H, Imre K, Morar A, Herman V, Sharif S. Exploring the Function of Quorum Sensing Regulated Biofilms in Biological Wastewater Treatment: A Review. Int J Mol Sci 2022; 23:ijms23179751. [PMID: 36077148 PMCID: PMC9456111 DOI: 10.3390/ijms23179751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Revised: 08/21/2022] [Accepted: 08/26/2022] [Indexed: 11/26/2022] Open
Abstract
Quorum sensing (QS), a type of bacterial cell–cell communication, produces autoinducers which help in biofilm formation in response to cell population density. In this review, biofilm formation, the role of QS in biofilm formation and development with reference to biological wastewater treatment are discussed. Autoinducers, for example, acyl-homoserine lactones (AHLs), auto-inducing oligo-peptides (AIPs) and autoinducer 2, present in both Gram-negative and Gram-positive bacteria, with their mechanism, are also explained. Over the years, wastewater treatment (WWT) by QS-regulated biofilms and their optimization for WWT have gained much attention. This article gives a comprehensive review of QS regulation methods, QS enrichment methods and QS inhibition methods in biological waste treatment systems. Typical QS enrichment methods comprise adding QS molecules, adding QS accelerants and cultivating QS bacteria, while typical QS inhibition methods consist of additions of quorum quenching (QQ) bacteria, QS-degrading enzymes, QS-degrading oxidants, and QS inhibitors. Potential applications of QS regulated biofilms for WWT have also been summarized. At last, the knowledge gaps present in current researches are analyzed, and future study requirements are proposed.
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Affiliation(s)
- Sania Sahreen
- Institute of Industrial Biotechnology, Government College University, Lahore 54000, Pakistan
| | - Hamid Mukhtar
- Institute of Industrial Biotechnology, Government College University, Lahore 54000, Pakistan
- Correspondence: (H.M.); (K.I.); Tel.: +92-3334245581 (H.M.); +40-256277186 (K.I.)
| | - Kálmán Imre
- Department of Animal Production and Veterinary Public Health, Faculty of Veterinary Medicine, Banat’s University of Agricultural Sciences and Veterinary Medicine “King Michael I of Romania”, 300645 Timisoara, Romania
- Correspondence: (H.M.); (K.I.); Tel.: +92-3334245581 (H.M.); +40-256277186 (K.I.)
| | - Adriana Morar
- Department of Animal Production and Veterinary Public Health, Faculty of Veterinary Medicine, Banat’s University of Agricultural Sciences and Veterinary Medicine “King Michael I of Romania”, 300645 Timisoara, Romania
| | - Viorel Herman
- Department of Infectious Diseases and Preventive Medicine, Faculty of Veterinary Medicine, Banat’s University of Agricultural Sciences and Veterinary Medicine “King Michael I of Romania”, 300645 Timisoara, Romania
| | - Sundas Sharif
- Institute of Industrial Biotechnology, Government College University, Lahore 54000, Pakistan
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8
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Zhao Z, Wang L, Miao J, Zhang Z, Ruan J, Xu L, Guo H, Zhang M, Qiao W. Regulation of the formation and structure of biofilms by quorum sensing signal molecules packaged in outer membrane vesicles. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 806:151403. [PMID: 34742801 DOI: 10.1016/j.scitotenv.2021.151403] [Citation(s) in RCA: 36] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2021] [Revised: 10/30/2021] [Accepted: 10/30/2021] [Indexed: 06/13/2023]
Abstract
Quorum sensing signal molecules can be used to regulate the formation of biofilm, but it has not been reported that outer membrane vesicles (OMVs) can package and mediate signal molecules to regulate biofilm. We isolated and purified OMVs packaged with Pseudomonas quinolone signal (PQS) released by Pseudomonas aeruginosa and studied the effects of OMV-mediated PQS on the formation and structure of biofilms. OMV-mediated PQS promoted the growth of biofilm, and the cells in the biofilm were stretched, deformed and "bridged" with the surrounding cells. Raman spectrometry showed that the structure and components of the extracellular polymeric substances of P. aeruginosa changed; moreover extracellular proteins rather than polysaccharides played the dominant role in the formation of P. aeruginosa biofilms when regulated by OMV-mediated PQS. In the combination biofilm formed by P. aeruginosa and Staphylococcus aureus, the mediation of OMVs enhanced the inhibitory effect of PQS to the growth of S. aureus, resulting a decrease in EPS produced by the two bacteria. OMV-mediated PQS led to changes in the biodiversity, richness and structure of the microbial community in biofilms formed by active sludge. This work reveals the mechanism of OMVs mediated signal molecules regulating biofilm, which lays a new theoretical and practical foundation for guiding the operation of low-level of biofouling MBRs.
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Affiliation(s)
- Zhenqing Zhao
- Department of Environmental Engineering, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China
| | - Lianjie Wang
- Department of Environmental Engineering, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China
| | - Jiahui Miao
- Department of Environmental Engineering, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China
| | - Ziyan Zhang
- Department of Environmental Engineering, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China
| | - Jingqi Ruan
- Department of Environmental Engineering, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China
| | - Lijie Xu
- Department of Environmental Engineering, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China
| | - He Guo
- Department of Environmental Engineering, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China
| | - Ming Zhang
- Department of Environmental Engineering, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China
| | - Weichuan Qiao
- Department of Environmental Engineering, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China.
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9
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Antimicrobial Weapons of Pseudomonas aeruginosa. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2022; 1386:223-256. [DOI: 10.1007/978-3-031-08491-1_8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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10
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Biological and clinical significance of quorum sensing alkylquinolones: current analytical and bioanalytical methods for their quantification. Anal Bioanal Chem 2021; 413:4599-4618. [PMID: 33959788 DOI: 10.1007/s00216-021-03356-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 03/21/2021] [Accepted: 04/16/2021] [Indexed: 12/27/2022]
Abstract
Quorum sensing (QS) is a sophisticated bacterial communication system which plays a key role in the virulence and biofilm formation of many pathogens. The Pseudomonas aeruginosa QS network consists of four sets of connected systems (las, rlh, pqs and iqs) hierarchically organized. The pqs system involves characteristic autoinducers (AI), most of them sharing an alkylquinolone (AQ) structure, and is able to carry out several relevant biological functions besides its main signalling activity. Their role in bacterial physiology and pathogenicity has been widely studied. Indeed, the presence of these metabolites in several body fluids and infected tissues has pointed to their potential value as biomarkers of infection. In this review, we summarize the most recent findings about the biological implications and the clinical significance of the main P. aeruginosa AQs. These findings have encouraged the development of analytical and bioanalytical techniques addressed to assess the role of these metabolites in bacterial growth and survival, during pathogenesis or as biomarkers of infections. The availability of highly sensitive reliable analytical methods suitable for clinical analysis would allow getting knowledge about pathogenesis and disease prognosis or progression, supporting clinicians on the decision-making process for the management of these infections and guiding them on the application of more effective and appropriate treatments. The benefits from the implementation of the point-of-care (PoC)-type testing in infectious disease diagnostics, which are seen to improve patient outcomes by promoting earlier therapeutic interventions, are also discussed.
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11
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Li Y, Yang Y, Feng Y, Pu J, Hou LA. Combined effects of Pseudomonas quinolone signal-based quorum quenching and graphene oxide on the mitigation of biofouling and improvement of the application potential for the thin-film composite membrane. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 760:143348. [PMID: 33162137 DOI: 10.1016/j.scitotenv.2020.143348] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Revised: 10/20/2020] [Accepted: 10/20/2020] [Indexed: 06/11/2023]
Abstract
Biofouling caused by the growth of the biofilm is the main bottleneck that limits the effective operation of thin-film composite (TFC) membrane in the forward osmosis (FO) process. This study investigated the combined effects of graphene oxide (GO) immobilized thin-film nanocomposite (TFN-S) membrane and Pseudomonas quinolone signal (PQS)-based quorum quenching on biofouling mitigation, especially under the operation of pressure-retarded osmosis (PRO) mode, and the influence of methyl anthranilate (MA) inhibitor on the composition and structure of biofilm was also evaluated. Synthetic wastewater was used as the feed solution, in which the model strain Pseudomonas aeruginosa was added to simulate biofouling. The results showed that GO modification and MA addition both efficiently mitigated flux decline and EPS secretion, but the interference of PQS pathway on biofouling control was better than GO embedding. TFN-S membrane with MA addition exhibited superior anti-biofouling performance based on the combined effects of GO and MA. The alleviated concentration polarization and enhanced hydrophilicity of the TFN-S membrane reduced the flux decline in the early stage. Additionally, the antibacterial property of GO inhibited the viability of the attached bacteria (under PRO mode) and MA further mitigated the EPS secretion and biofilm development in the later stage. In the presence of PQS inhibitor MA, live/total cells ratio was 15% and 13% higher than that of TFC membrane in FO and PRO modes, respectively. Furthermore, exogenous addition of MA led to a relatively loose biofilm structure, resulting in high membrane permeability in the biofouling formation process.
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Affiliation(s)
- Yuan Li
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
| | - Yu Yang
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
| | - Yuruo Feng
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
| | - Jian Pu
- Institute for Future Initiatives, The University of Tokyo, Tokyo 113-8654, Japan.
| | - Li-An Hou
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China; Xi'an High-Tech Institute, Xi'an 710025, China.
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12
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Watanabe T. Synthesis and Structure−Activity Relationship Study of Intervenolin, an Antitumor and Anti-Helicobacter pylori Quinolone Natural Product. HETEROCYCLES 2021. [DOI: 10.3987/rev-21-957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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13
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Extracellular products-mediated interspecific interaction between Pseudomonas aeruginosa and Escherichia coli. J Microbiol 2020; 59:29-40. [PMID: 33355890 DOI: 10.1007/s12275-021-0478-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 10/29/2020] [Accepted: 11/11/2020] [Indexed: 10/22/2022]
Abstract
The Gram-negative pathogen Pseudomonas aeruginosa adopts several elaborate strategies to colonize a wide range of natural or clinical niches and to overcome the neighboring bacterial competitors in polymicrobial communities. However, the relationship and interaction mechanism of P. aeruginosa with other bacterial pathogens remains largely unexplored. Here we explore the interaction dynamics of P. aeruginosa and Escherichia coli, which frequently coinfect the lungs of immunocompromised hosts, by using a series of on-plate proximity assays and RNA-sequencing. We show that the extracellular products of P. aeruginosa can inhibit the growth of neighboring E. coli and induce a large-scale of transcriptional reprogramming of E. coli, especially in terms of cellular respiration-related primary metabolisms and membrane components. In contrast, the presence of E. coli has no significant effect on the growth of P. aeruginosa in short-term culture, but causes a dysregulated expression of genes positively controlled by the quorum-sensing (QS) system of P. aeruginosa during subsequent pairwise culture. We further demonstrate that the divergent QS-regulation of P. aeruginosa may be related to the function of the transcriptional regulator PqsR, which can be enhanced by E. coli culture supernatant to increase the pyocyanin production by P. aeruginosa in the absence of the central las-QS system. Moreover, the extracellular products of E. coli promote the proliferation and lethality of P. aeruginosa in infecting the Caenorhabditis elegans model. The current study provides a general characterization of the extracellular products-mediated interactions between P. aeruginosa and E. coli, and may facilitate the understanding of polymicrobial infections.
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14
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Bacterial Alkyl-4-quinolones: Discovery, Structural Diversity and Biological Properties. Molecules 2020; 25:molecules25235689. [PMID: 33276615 PMCID: PMC7731028 DOI: 10.3390/molecules25235689] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 11/27/2020] [Accepted: 11/27/2020] [Indexed: 11/17/2022] Open
Abstract
The alkyl-4-quinolones (AQs) are a class of metabolites produced primarily by members of the Pseudomonas and Burkholderia genera, consisting of a 4-quinolone core substituted by a range of pendant groups, most commonly at the C-2 position. The history of this class of compounds dates back to the 1940s, when a range of alkylquinolones with notable antibiotic properties were first isolated from Pseudomonas aeruginosa. More recently, it was discovered that an alkylquinolone derivative, the Pseudomonas Quinolone Signal (PQS) plays a key role in bacterial communication and quorum sensing in Pseudomonas aeruginosa. Many of the best-studied examples contain simple hydrocarbon side-chains, but more recent studies have revealed a wide range of structurally diverse examples from multiple bacterial genera, including those with aromatic, isoprenoid, or sulfur-containing side-chains. In addition to their well-known antimicrobial properties, alkylquinolones have been reported with antimalarial, antifungal, antialgal, and antioxidant properties. Here we review the structural diversity and biological activity of these intriguing metabolites.
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15
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Wang R, Ding W, Long L, Lan Y, Tong H, Saha S, Wong YH, Sun J, Li Y, Zhang W, Qian PY. Exploring the Influence of Signal Molecules on Marine Biofilms Development. Front Microbiol 2020; 11:571400. [PMID: 33281767 PMCID: PMC7691533 DOI: 10.3389/fmicb.2020.571400] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Accepted: 10/27/2020] [Indexed: 01/10/2023] Open
Abstract
Microbes respond to environmental stimuli through complicated signal transduction systems. In microbial biofilms, because of complex multiple species interactions, signals transduction systems are of an even higher complexity. Here, we performed a signal-molecule-treatment experiment to study the role of different signal molecules, including N-hexanoyl-L-homoserine lactone (C6-HSL), N-dodecanoyl-L-homoserine lactone (C12-HSL), Pseudomonas quinolone signal (PQS), and cyclic di-GMP (c-di-GMP), in the development of marine biofilms. Comparative metagenomics suggested a distinctive influence of these molecules on the microbial structure and function of multi-species biofilm communities in its developing stage. The PQS-treated biofilms shared the least similarity with the control and initial biofilms. The role of PQS in biofilm development was further explored experimentally with the strain Erythrobacter sp. HKB8 isolated from marine biofilms. Comparative transcriptomic analysis showed that 314 genes, such as those related to signal transduction and biofilm formation, were differentially expressed in the untreated and PQS-treated Erythrobacter sp. HKB8 biofilms. Our study demonstrated the different roles of signal molecules in marine biofilm development. In particular, the PQS-based signal transduction system, which is frequently detected in marine biofilms, may play an important role in regulating microbe-microbe interactions and the assemblage of biofilm communities.
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Affiliation(s)
- Ruojun Wang
- Department of Ocean Science, Hong Kong University of Science and Technology, Kowloon, Hong Kong.,Hong Kong Branch of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Hong Kong University of Science and Technology, Kowloon, Hong Kong
| | - Wei Ding
- College of Marine Life Sciences, Ocean University of China, Qingdao, China
| | - Lexin Long
- Department of Ocean Science, Hong Kong University of Science and Technology, Kowloon, Hong Kong.,Hong Kong Branch of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Hong Kong University of Science and Technology, Kowloon, Hong Kong.,Institute for Advanced Study, Shenzhen University, Shenzhen, China
| | - Yi Lan
- Department of Ocean Science, Hong Kong University of Science and Technology, Kowloon, Hong Kong.,Hong Kong Branch of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Hong Kong University of Science and Technology, Kowloon, Hong Kong
| | - Haoya Tong
- Department of Ocean Science, Hong Kong University of Science and Technology, Kowloon, Hong Kong.,Hong Kong Branch of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Hong Kong University of Science and Technology, Kowloon, Hong Kong
| | - Subhasish Saha
- Department of Ocean Science, Hong Kong University of Science and Technology, Kowloon, Hong Kong
| | - Yue Him Wong
- Institute for Advanced Study, Shenzhen University, Shenzhen, China
| | - Jin Sun
- Department of Ocean Science, Hong Kong University of Science and Technology, Kowloon, Hong Kong.,Hong Kong Branch of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Hong Kong University of Science and Technology, Kowloon, Hong Kong
| | - Yongxin Li
- Department of Ocean Science, Hong Kong University of Science and Technology, Kowloon, Hong Kong.,The Swire Institute of Marine Science, The University of Hong Kong, Pokfulam, Hong Kong.,The Department of Chemistry, The University of Hong Kong, Pokfulam, Hong Kong
| | - Weipeng Zhang
- College of Marine Life Sciences, Ocean University of China, Qingdao, China
| | - Pei-Yuan Qian
- Department of Ocean Science, Hong Kong University of Science and Technology, Kowloon, Hong Kong.,Hong Kong Branch of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Hong Kong University of Science and Technology, Kowloon, Hong Kong
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16
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Anti-biofouling behavior of quorum quenching for removal of pharmaceuticals by forward osmosis membrane based on pseudomonas quinolone signals. J Memb Sci 2020. [DOI: 10.1016/j.memsci.2020.118475] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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17
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Ahator SD, Zhang L. Small Is Mighty—Chemical Communication Systems in Pseudomonas aeruginosa. Annu Rev Microbiol 2019; 73:559-578. [DOI: 10.1146/annurev-micro-020518-120044] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Pseudomonas aeruginosa is an opportunistic pathogen that causes a variety of acute and chronic infections. Usually a commensal on the host body, P. aeruginosa is capable of transforming into a virulent pathogen upon sensing favorable changes in the host immune system or stress cues. P. aeruginosa infections are hard to eradicate, because this pathogen has developed strong resistance to most conventional antibiotics; in addition, in chronic infections it commonly forms a biofilm matrix, which provides bacterial cells a protected environment to withstand various stresses including antibiotics. Given its importance as a human pathogen and its notorious antimicrobial tolerance, P. aeruginosa has been the subject of intensive investigations internationally. Research progress over the last two decades has unveiled a range of chemical communication systems in this pathogen. These diversified chemical communication systems endow P. aeruginosa a superb ability and remarkable flexibility to coordinate and modulate accordingly the transcriptional expression of various sets of genes associated with virulence and other physiologic activities in response to environmental changes. A fair understanding of the chemical signaling mechanisms with which P. aeruginosa governs virulence gene expression may hold the key to developing alternative therapeutic interventions that control and prevent bacterial infections.
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Affiliation(s)
- Stephen Dela Ahator
- Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Center, South China Agricultural University, Guangzhou 510642, China
| | - LianHui Zhang
- Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Center, South China Agricultural University, Guangzhou 510642, China
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18
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Vandeplassche E, Sass A, Lemarcq A, Dandekar AA, Coenye T, Crabbé A. In vitro evolution of Pseudomonas aeruginosa AA2 biofilms in the presence of cystic fibrosis lung microbiome members. Sci Rep 2019; 9:12859. [PMID: 31492943 PMCID: PMC6731285 DOI: 10.1038/s41598-019-49371-y] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Accepted: 08/20/2019] [Indexed: 01/16/2023] Open
Abstract
In cystic fibrosis (CF) airways, the opportunistic pathogen Pseudomonas aeruginosa evolves from an acute to a chronic infection phenotype. Yet, the in vivo factors influencing the evolutionary trajectory of P. aeruginosa are poorly understood. This study aimed at understanding the role of the CF lung microbiome in P. aeruginosa evolution. Therefore, we investigated the in vitro biofilm evolution of an early CF P. aeruginosa isolate, AA2, in the presence or absence of a synthetic CF lung microbiome. Whole genome sequencing of evolved populations revealed mutations in quorum sensing (QS) genes (lasR, pqsR) with and without the microbiome. Phenotypic assays confirmed decreased production of the QS molecule 3-O-C12-homoserine lactone, and QS-regulated virulence factors pyocyanin and protease. Furthermore, a mixture of lasR and lasR pqsR mutants was found, in which double mutants showed less pyocyanin and protease production than lasR mutants. While the microbial community did not influence the production of the tested P. aeruginosa virulence factors, we observed a trend towards more mutations in the transcriptional regulators gntR and mexL when P. aeruginosa was grown alone. P. aeruginosa developed resistance to β-lactam antibiotics during evolution, when grown with and without the microbiome. In conclusion, in an experimental biofilm environment, the early P. aeruginosa CF isolate AA2 evolves towards a CF-like genotype and phenotype, and most studied evolutionary adaptations are not impacted by CF microbiome members.
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Affiliation(s)
- Eva Vandeplassche
- Laboratory of Pharmaceutical Microbiology, Ghent University, Ghent, Belgium
| | - Andrea Sass
- Laboratory of Pharmaceutical Microbiology, Ghent University, Ghent, Belgium
| | - Astrid Lemarcq
- Laboratory of Pharmaceutical Microbiology, Ghent University, Ghent, Belgium
| | - Ajai A Dandekar
- Department of Medicine/Department of Microbiology, University of Washington, Washington, USA
| | - Tom Coenye
- Laboratory of Pharmaceutical Microbiology, Ghent University, Ghent, Belgium
| | - Aurélie Crabbé
- Laboratory of Pharmaceutical Microbiology, Ghent University, Ghent, Belgium.
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19
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Reen FJ, McGlacken GP, O'Gara F. The expanding horizon of alkyl quinolone signalling and communication in polycellular interactomes. FEMS Microbiol Lett 2019; 365:4953739. [PMID: 29718276 DOI: 10.1093/femsle/fny076] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Accepted: 03/25/2018] [Indexed: 02/07/2023] Open
Abstract
Population dynamics within natural ecosystems is underpinned by microbial diversity and the heterogeneity of host-microbe and microbe-microbe interactions. Small molecule signals that intersperse between species have been shown to govern many virulence-related processes in established and emerging pathogens. Understanding the capacity of microbes to decode diverse languages and adapt to the presence of 'non-self' cells will provide an important new direction to the understanding of the 'polycellular' interactome. Alkyl quinolones (AQs) have been described in the ESKAPE pathogen Pseudomonas aeruginosa, the primary agent associated with mortality in patients with cystic fibrosis and the third most prevalent nosocomial pathogen worldwide. The role of these molecules in governing the physiology and virulence of P. aeruginosa and other pathogens has received considerable attention, while a role in interspecies and interkingdom communication has recently emerged. Herein we discuss recent advances in our understanding of AQ signalling and communication in the context of microbe-microbe and microbe-host interactions. The integrated knowledge from these systems-based investigations will facilitate the development of new therapeutics based on the AQ framework that serves to disarm the pathogenesis of P. aeruginosa and competing pathogens.
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Affiliation(s)
- F Jerry Reen
- School of Microbiology, University College Cork, Cork, Ireland
| | - Gerard P McGlacken
- School of Chemistry and Analytical & Biological Chemistry Research Facility (ABCRF), University College Cork, Ireland
| | - Fergal O'Gara
- BIOMERIT Research Centre, School of Microbiology, University College Cork, Cork, Ireland
- Human Microbiome Programme, School of Pharmacy and Biomedical Sciences, Curtin Health Innovation Research Institute, Curtin University, Perth, WA 6102, USA
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20
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Abstract
Bacteria can communicate through diffusible signaling molecules that are perceived by cognate receptors. It is now well established that bacterial communication regulates hundreds of genes. Hydrophobic molecules which do not diffuse in aqueous environments alone have been identified in bacterial communication, that raised the question on how these molecules are transported between cells and trigger gene expressions. Recent studies show that these hydrophobic signaling molecules, including a long-chain N-acyl homoserine lactone signal produced in Paracoccus denitrificans, are carried by membrane vesicles (MVs). MVs were thought to be formed only through the blebbing of the cell membrane, but new findings in Pseudomonas aeruginosa and Bacillus subtilis revealed that different types of MVs can be formed through explosive cell lysis or bubbling cell death, which findings have certain implications on our view of bacterial interactions.
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Affiliation(s)
- Masanori Toyofuku
- a Faculty of Life and Environmental Sciences, University of Tsukuba , Tsukuba , Japan.,b Microbiology Research Center for Sustainability (MiCS), University of Tsukuba , Tsukuba , Japan
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21
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Zhao K, Li J, Huang T, Yuan Y, Lin J, Yue B, Wang X, Chu Y. Coexistence of Microbial Species in Structured Communities by Forming a Hawk-Dove Game Like Interactive Relationship. Front Microbiol 2019; 10:807. [PMID: 31057514 PMCID: PMC6477097 DOI: 10.3389/fmicb.2019.00807] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Accepted: 03/29/2019] [Indexed: 11/13/2022] Open
Abstract
Microorganisms evolve kinds of elaborate interaction models that can form relatively stable communities in a wide range of ecosystems. It is recognized that the spatial genetic structure of microbes in surface-attached environments lays a good foundation for the persistence of polymicrobial communities in adverse conditions. However, the interacting dynamics of microbes in facilitating the formation and stabilization of community structure still remains elusive. In this study, we identify a hawk-dove game like interspecific relationship between the two Gram-negative opportunistic pathogens Pseudomonas aeruginosa and Klebsiella pneumoniae, which naturally coexist in insect gut and can cocolonize human tissues. Specifically, although P. aeruginosa had significant competitive advantage over cocultured K. pneumoniae on solid medium with rich nutrient factors, K. pneumoniae could resist the suppression of P. aeruginosa by enhancing the expression of membrane transporters induced by the extracellular metabolites of P. aeruginosa. By contrast, under the condition that K. pneumoniae had a growth advantage but P. aeruginosa met a metabolic burden in producing quorum-sensing-controlled extracellular products, the frequency of K. pneumoniae would be slightly higher than P. aeruginosa during the coexistence because K. pneumoniae was also capable of exploiting the extracellular metabolite from P. aeruginosa. In addition, P. aeruginosa quorum-sensing variant could reap benefits from K. pneumoniae in turn and reach a relatively stable two species equilibrium. These findings provide an explanation for the formation and maintenance of polymicrobial communities in different spatially structured environments, and thus may contribute to understanding the complex interspecific interactions of microbes in local communities and shed new light on the development of social microbiology.
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Affiliation(s)
- Kelei Zhao
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, Chengdu University, Chengdu, China
| | - Jing Li
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, Chengdu University, Chengdu, China
| | - Ting Huang
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, Chengdu University, Chengdu, China
| | - Yang Yuan
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, Chengdu University, Chengdu, China
| | - Jiafu Lin
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, Chengdu University, Chengdu, China
| | - Bisong Yue
- Key Laboratory of Bio-Resources and Eco-Environment (Ministry of Education), College of Life Sciences, Sichuan University, Chengdu, China
| | - Xinrong Wang
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, Chengdu University, Chengdu, China
| | - Yiwen Chu
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, Chengdu University, Chengdu, China
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22
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Scott JE, Li K, Filkins LM, Zhu B, Kuchma SL, Schwartzman JD, O'Toole GA. Pseudomonas aeruginosa Can Inhibit Growth of Streptococcal Species via Siderophore Production. J Bacteriol 2019; 201:e00014-19. [PMID: 30718303 PMCID: PMC6436353 DOI: 10.1128/jb.00014-19] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Accepted: 01/29/2019] [Indexed: 12/30/2022] Open
Abstract
Cystic fibrosis (CF) is a genetic disease that causes patients to accumulate thick, dehydrated mucus in the lung and develop chronic, polymicrobial infections due to reduced mucociliary clearance. These chronic polymicrobial infections and subsequent decline in lung function are significant factors in the morbidity and mortality of CF. Pseudomonas aeruginosa and Streptococcus spp. are among the most prevalent organisms in the CF lung; the presence of P. aeruginosa correlates with lung function decline, and the Streptococcus milleri group (SMG), a subgroup of the viridans streptococci, is associated with exacerbations in patients with CF. Here we characterized the interspecies interactions that occur between these two genera. We demonstrated that multiple P. aeruginosa laboratory strains and clinical CF isolates promote the growth of multiple SMG strains and oral streptococci in an in vitro coculture system. We investigated the mechanism by which P. aeruginosa enhances growth of streptococci by screening for mutants of P. aeruginosa PA14 that are unable to enhance Streptococcus growth, and we identified the P. aeruginosapqsL::TnM mutant, which failed to promote growth of Streptococcus constellatus and S. sanguinis Characterization of the P. aeruginosa ΔpqsL mutant revealed that this strain cannot promote Streptococcus growth. Our genetic data and growth studies support a model whereby the P. aeruginosa ΔpqsL mutant overproduces siderophores and thus likely outcompetes Streptococcus sanguinis for limited iron. We propose a model whereby competition for iron represents one important means of interaction between P. aeruginosa and Streptococcus spp.IMPORTANCE Cystic fibrosis (CF) lung infections are increasingly recognized for their polymicrobial nature. These polymicrobial infections may alter the biology of the organisms involved in CF-related infections, leading to changes in growth, virulence, and/or antibiotic tolerance, and could thereby affect patient health and response to treatment. In this study, we demonstrate interactions between P. aeruginosa and streptococci using a coculture model and show that one interaction between these microbes is likely competition for iron. Thus, these data indicate that one CF pathogen may influence the growth of another, and they add to our limited knowledge of polymicrobial interactions in the CF airway.
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Affiliation(s)
- Jessie E Scott
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire, USA
| | - Kewei Li
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire, USA
- School of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Laura M Filkins
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire, USA
| | - Bin Zhu
- VCU Philips Institute for Oral Health Research, Microbiology and Immunology, Virginia Commonwealth University, Richmond, Virginia, USA
| | - Sherry L Kuchma
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire, USA
| | - Joseph D Schwartzman
- Department of Pathology, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire, USA
| | - George A O'Toole
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire, USA
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23
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Yang Y, Zhou H, Mei X, Liu B, Xing D. Dual-Edged Character of Quorum Sensing Signaling Molecules in Microbial Extracellular Electron Transfer. Front Microbiol 2018; 9:1924. [PMID: 30177923 PMCID: PMC6109780 DOI: 10.3389/fmicb.2018.01924] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2018] [Accepted: 07/30/2018] [Indexed: 12/21/2022] Open
Abstract
Quorum sensing (QS) is a central mechanism for regulating bacterial social networks in biofilm via the production of diffusible signal molecules (autoinducers). In this work, we assess the contribution of QS autoinducers to microbial extracellular electron transfer (EET) by Pseudomonas aeruginosa strain PAO1 and three mutants pure culture-inoculated in microbial electrolysis cells (MECs) and microbial fuel cells (MFCs). MECs inoculated with different P. aeruginosa strains showed a difference in current generation. All MFCs reached a reproducible cycle of current generation, and PQS-deficient pqsA mutant inoculated-MFCs obtained a much higher current generation than pqsL mutant inoculated-MFCs which overproduced PQS. lasIrhlI-inoculated MFCs produced a lower power output than others, as the strain was deficient in rhl and las. Exogenous N-butanoyl-l-homoserine lactone could remedy the electricity production by lasIrhlI mutants to a level similar to wild-type strains while signaling molecules had little effect on wild-type bacteria in MFCs. Meanwhile, experiments with the wild-type and pqsA, pqsL mutants indicated that the overexpression of PQS signaling molecules made no significant contribution to EET. QS signaling molecules therefore have dual-edged effects on microbial EET. These findings will provide favorable suggestions on the regulation of EET, but detailed QS regulatory mechanisms for extracellular electron transfer in pure- and mixed-cultures are yet to be elucidated.
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Affiliation(s)
- Yang Yang
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin, China
| | - Huihui Zhou
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin, China
| | - Xiaoxue Mei
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin, China
| | - Bingfeng Liu
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin, China
| | - Defeng Xing
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin, China
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24
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Lin J, Cheng J, Wang Y, Shen X. The Pseudomonas Quinolone Signal (PQS): Not Just for Quorum Sensing Anymore. Front Cell Infect Microbiol 2018; 8:230. [PMID: 30023354 PMCID: PMC6039570 DOI: 10.3389/fcimb.2018.00230] [Citation(s) in RCA: 144] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Accepted: 06/18/2018] [Indexed: 12/26/2022] Open
Abstract
The Pseudomonas quinolone signal (PQS) has been studied primarily in the context of its role as a quorum-sensing signaling molecule. Recent data suggest, however, that this molecule may also function to mediate iron acquisition, cytotoxicity, outer-membrane vesicle biogenesis, or to exert host immune modulatory activities.
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Affiliation(s)
- Jinshui Lin
- Shaanxi Engineering and Technological Research Center for Conservation and Utilization of Regional Biological Resources, Yan'an University, Yan'an, China.,College of Life Sciences, Yan'an University, Yan'an, China
| | - Juanli Cheng
- Shaanxi Engineering and Technological Research Center for Conservation and Utilization of Regional Biological Resources, Yan'an University, Yan'an, China.,College of Life Sciences, Yan'an University, Yan'an, China
| | - Yao Wang
- Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Sciences, Northwest A&F University, Yangling, China.,State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling, China
| | - Xihui Shen
- Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Sciences, Northwest A&F University, Yangling, China.,State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling, China
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25
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Thierbach S, Birmes FS, Letzel MC, Hennecke U, Fetzner S. Chemical Modification and Detoxification of the Pseudomonas aeruginosa Toxin 2-Heptyl-4-hydroxyquinoline N-Oxide by Environmental and Pathogenic Bacteria. ACS Chem Biol 2017; 12:2305-2312. [PMID: 28708374 DOI: 10.1021/acschembio.7b00345] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
2-Heptyl-4-hydroxyquinoline N-oxide (HQNO), a major secondary metabolite and virulence factor produced by the opportunistic pathogen Pseudomonas aeruginosa, acts as a potent inhibitor of respiratory electron transfer and thereby affects host cells as well as microorganisms. In this study, we demonstrate the previously unknown capability of environmental and pathogenic bacteria to transform and detoxify this compound. Strains of Arthrobacter and Rhodococcus spp. as well as Staphylococcus aureus introduced a hydroxyl group at C-3 of HQNO, whereas Mycobacterium abscessus, M. fortuitum, and M. smegmatis performed an O-methylation, forming 2-heptyl-1-methoxy-4-oxoquinoline as the initial metabolite. Bacillus spp. produced the glycosylated derivative 2-heptyl-1-(β-d-glucopyranosydyl)-4-oxoquinoline. Assaying the effects of these metabolites on cellular respiration and on quinol oxidase activity of membrane fractions revealed that their EC50 values were up to 2 orders of magnitude higher than that of HQNO. Furthermore, cellular levels of reactive oxygen species were significantly lower in the presence of the metabolites than under the influence of HQNO. Therefore, the capacity to transform HQNO should lead to a competitive advantage against P. aeruginosa. Our findings contribute new insight into the metabolic diversity of bacteria and add another layer of complexity to the metabolic interactions which likely contribute to shaping polymicrobial communities comprising P. aeruginosa.
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Affiliation(s)
- Sven Thierbach
- Institute
for Molecular Microbiology and Biotechnology, University of Münster, 48149 Münster, Germany
| | - Franziska S. Birmes
- Institute
for Molecular Microbiology and Biotechnology, University of Münster, 48149 Münster, Germany
| | - Matthias C. Letzel
- Organic
Chemistry Institute, University of Münster, 48149 Münster, Germany
| | - Ulrich Hennecke
- Organic
Chemistry Institute, University of Münster, 48149 Münster, Germany
| | - Susanne Fetzner
- Institute
for Molecular Microbiology and Biotechnology, University of Münster, 48149 Münster, Germany
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26
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Moreira LM, Soares MR, Facincani AP, Ferreira CB, Ferreira RM, Ferro MIT, Gozzo FC, Felestrino ÉB, Assis RAB, Garcia CCM, Setubal JC, Ferro JA, de Oliveira JCF. Proteomics-based identification of differentially abundant proteins reveals adaptation mechanisms of Xanthomonas citri subsp. citri during Citrus sinensis infection. BMC Microbiol 2017; 17:155. [PMID: 28693412 PMCID: PMC5504864 DOI: 10.1186/s12866-017-1063-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Accepted: 07/01/2017] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Xanthomonas citri subsp. citri (Xac) is the causal agent of citrus canker. A proteomic analysis under in planta infectious and non-infectious conditions was conducted in order to increase our knowledge about the adaptive process of Xac during infection. RESULTS For that, a 2D-based proteomic analysis of Xac at 1, 3 and 5 days after inoculation, in comparison to Xac growth in NB media was carried out and followed by MALDI-TOF-TOF identification of 124 unique differentially abundant proteins. Among them, 79 correspond to up-regulated proteins in at least one of the three stages of infection. Our results indicate an important role of proteins related to biofilm synthesis, lipopolysaccharides biosynthesis, and iron uptake and metabolism as possible modulators of plant innate immunity, and revealed an intricate network of proteins involved in reactive oxygen species adaptation during Plants` Oxidative Burst response. We also identified proteins previously unknown to be involved in Xac-Citrus interaction, including the hypothetical protein XAC3981. A mutant strain for this gene has proved to be non-pathogenic in respect to classical symptoms of citrus canker induced in compatible plants. CONCLUSIONS This is the first time that a protein repertoire is shown to be active and working in an integrated manner during the infection process in a compatible host, pointing to an elaborate mechanism for adaptation of Xac once inside the plant.
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Affiliation(s)
- Leandro M Moreira
- Departamento de Ciências Biológicas (DECBI), Instituto de Ciências Exatas e Biológicas (ICEB), Universidade Federal de Ouro Preto (UFOP), Ouro Preto, MG, Brazil. .,Núcleo de Pesquisas em Ciências Biológicas (NUPEB), Universidade Federal de Ouro Preto, Ouro Preto, MG, Brazil.
| | - Márcia R Soares
- Departamento de Bioquímica (DBq), Instituto de Química (IQ), Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, RJ, Brazil
| | - Agda P Facincani
- Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, UNESP - Universidade Estadual Paulista, Departamento de Tecnologia, Jaboticabal, SP, Brazil.
| | - Cristiano B Ferreira
- Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, UNESP - Universidade Estadual Paulista, Departamento de Tecnologia, Jaboticabal, SP, Brazil
| | - Rafael M Ferreira
- Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, UNESP - Universidade Estadual Paulista, Departamento de Tecnologia, Jaboticabal, SP, Brazil
| | - Maria I T Ferro
- Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, UNESP - Universidade Estadual Paulista, Departamento de Tecnologia, Jaboticabal, SP, Brazil
| | - Fábio C Gozzo
- Instituto de Química, Universidade Estadual de Campinas (UNICAMP), Campinas, SP, Brazil
| | - Érica B Felestrino
- Núcleo de Pesquisas em Ciências Biológicas (NUPEB), Universidade Federal de Ouro Preto, Ouro Preto, MG, Brazil
| | - Renata A B Assis
- Núcleo de Pesquisas em Ciências Biológicas (NUPEB), Universidade Federal de Ouro Preto, Ouro Preto, MG, Brazil
| | - Camila Carrião M Garcia
- Departamento de Ciências Biológicas (DECBI), Instituto de Ciências Exatas e Biológicas (ICEB), Universidade Federal de Ouro Preto (UFOP), Ouro Preto, MG, Brazil.,Núcleo de Pesquisas em Ciências Biológicas (NUPEB), Universidade Federal de Ouro Preto, Ouro Preto, MG, Brazil
| | - João C Setubal
- Departamento de Bioquímica (DB), Instituto de Química (IQ), Universidade de São Paulo (USP), São Paulo, SP, Brazil.,Biocomplexity Institute, Virginia Tech, Blacksburg, VA, USA
| | - Jesus A Ferro
- Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, UNESP - Universidade Estadual Paulista, Departamento de Tecnologia, Jaboticabal, SP, Brazil
| | - Julio C F de Oliveira
- Departamento de Ciências Biológicas (DCB), Universidade Federal de São Paulo (UNIFESP), Diadema, SP, Brazil
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27
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Hotterbeekx A, Kumar-Singh S, Goossens H, Malhotra-Kumar S. In vivo and In vitro Interactions between Pseudomonas aeruginosa and Staphylococcus spp. Front Cell Infect Microbiol 2017; 7:106. [PMID: 28421166 PMCID: PMC5376567 DOI: 10.3389/fcimb.2017.00106] [Citation(s) in RCA: 167] [Impact Index Per Article: 23.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Accepted: 03/16/2017] [Indexed: 01/04/2023] Open
Abstract
The significance of polymicrobial infections is increasingly being recognized especially in a biofilm context wherein multiple bacterial species—including both potential pathogens and members of the commensal flora—communicate, cooperate, and compete with each other. Two important bacterial pathogens that have developed a complex network of evasion, counter-inhibition, and subjugation in their battle for space and nutrients are Pseudomonas aeruginosa and Staphylococcus aureus. Their strain- and environment-specific interactions, for instance in the cystic fibrosis lung or in wound infections, show severe competition that is generally linked to worse patient outcomes. For instance, the extracellular factors secreted by P. aeruginosa have been shown to subjugate S. aureus to persist as small colony variants (SCVs). On the other hand, data also exist where S. aureus inhibits biofilm formation by P. aeruginosa but also protects the pathogen by inhibiting its phagocytosis. Interestingly, such interspecies interactions differ between the planktonic and biofilm phenotype, with the extracellular matrix components of the latter likely being a key, and largely underexplored, influence. This review attempts to understand the complex relationship between P. aeruginosa and Staphylococcus spp., focusing on S. aureus, that not only is interesting from the bacterial evolution point of view, but also has important consequences for our understanding of the disease pathogenesis for better patient management.
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Affiliation(s)
- An Hotterbeekx
- Laboratory of Medical Microbiology, Vaccine and Infectious Disease Institute, University of AntwerpWilrijk, Belgium
| | - Samir Kumar-Singh
- Laboratory of Medical Microbiology, Vaccine and Infectious Disease Institute, University of AntwerpWilrijk, Belgium.,Molecular Pathology Group, Cell Biology and Histology, University of AntwerpWilrijk, Belgium
| | - Herman Goossens
- Laboratory of Medical Microbiology, Vaccine and Infectious Disease Institute, University of AntwerpWilrijk, Belgium
| | - Surbhi Malhotra-Kumar
- Laboratory of Medical Microbiology, Vaccine and Infectious Disease Institute, University of AntwerpWilrijk, Belgium
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28
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Cheng Y, Zhang Y, Shen Q, Gao J, Zhuang G, Zhuang X. Effects of exogenous short-chain N-acyl homoserine lactone on denitrifying process of Paracoccus denitrificans. J Environ Sci (China) 2017; 54:33-39. [PMID: 28391944 DOI: 10.1016/j.jes.2016.05.019] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Revised: 04/07/2016] [Accepted: 05/05/2016] [Indexed: 05/03/2023]
Abstract
N-acyl-homoserine lactones (AHLs) serve as quorum-sensing signals, which control a number of bacterial processes in many proteobacteria. Here we report the effects of exogenous short-chain AHL on the denitrifying process of Paracoccus denitrificans, which are capable of aerobic and anaerobic growth by utilizing nitrate. The denitrification activity of these cells was monitored by measuring denitrification products (including nitrate, nitrite, and nitrous oxide), and the individual messenger ribonucleic acid (mRNA) levels of nitrate, nitrite, nitric oxide and nitrous oxide reductases. The results indicated that 2μmol/L C6-homoserine lactone (HSL) has little effect on cell density under either anaerobic or aerobic culture conditions, and the nitrate reduction activity appeared slightly affected by N-hexanoyl-DL-homoserine lactone (C6-HSL). However, exogenous C6-HSL significantly affected the transcription of nitrite reductase and nitric oxide reductase genes in P. denitrificans regardless of the presence of oxygen, and N2O accumulation activity in P. denitrificans was suppressed by C6-HSL under aerobic condition. In contrast, exogenous C6-HSL stimulated the production of N2O under anaerobic condition, suggesting that the regulation of denitrification by quorum sensing may be important in N2O release.
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Affiliation(s)
- Yun Cheng
- School of Life Sciences, University of Science and Technology of China, Hefei 230026, China; CAS Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
| | - Yang Zhang
- CAS Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Qiuxuan Shen
- CAS Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Jie Gao
- CAS Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
| | - Guoqiang Zhuang
- CAS Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Xuliang Zhuang
- CAS Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
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29
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Bortolotti P, Hennart B, Thieffry C, Jausions G, Faure E, Grandjean T, Thepaut M, Dessein R, Allorge D, Guery BP, Faure K, Kipnis E, Toussaint B, Le Gouellec A. Tryptophan catabolism in Pseudomonas aeruginosa and potential for inter-kingdom relationship. BMC Microbiol 2016; 16:137. [PMID: 27392067 PMCID: PMC4938989 DOI: 10.1186/s12866-016-0756-x] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Accepted: 06/30/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Pseudomonas aeruginosa (Pa) is a Gram-negative bacteria frequently involved in healthcare-associated pneumonia with poor clinical outcome. To face the announced post-antibiotic era due to increasing resistance and lack of new antibiotics, new treatment strategies have to be developed. Immunomodulation of the host response involved in outcome could be an alternative therapeutic target in Pa-induced lung infection. Kynurenines are metabolites resulting from tryptophan catabolism and are known for their immunomodulatory properties. Pa catabolizes tryptophan through the kynurenine pathway. Interestingly, many host cells also possess the kynurenine pathway, whose metabolites are known to control immune system homeostasis. Thus, bacterial metabolites may interfere with the host's immune response. However, the kynurenine pathway in Pa, including functional enzymes, types and amounts of secreted metabolites remains poorly known. Using liquid chromatography coupled to mass spectrometry and different strains of Pa, we determined types and levels of metabolites produced by Pa ex vivo in growth medium, and the relevance of this production in vivo in a murine model of acute lung injury. RESULTS Ex vivo, Pa secretes clinically relevant kynurenine levels (μM to mM). Pa also secretes kynurenic acid and 3-OH-kynurenine, suggesting that the bacteria possess both a functional kynurenine aminotransferase and kynurenine monooxygenase. The bacterial kynurenine pathway is the major pathway leading to anthranilate production both ex vivo and in vivo. In the absence of the anthranilate pathway, the kynurenine pathway leads to kynurenic acid production. CONCLUSION Pa produces and secretes several metabolites of the kynurenine pathway. Here, we demonstrate the existence of new metabolic pathways leading to synthesis of bioactive molecules, kynurenic acid and 3-OH-kynurenine in Pa. The kynurenine pathway in Pa is critical to produce anthranilate, a crucial precursor of some Pa virulence factors. Metabolites (anthranilate, kynurenine, kynurenic acid) are produced at sustained levels both ex vivo and in vivo leading to a possible immunomodulatory interplay between bacteria and host. These data may imply that pulmonary infection with bacteria highly expressing the kynurenine pathway enzymes could influence the equilibrium of the host's tryptophan metabolic pathway, known to be involved in the immune response to infection. Further studies are needed to explore the effects of these metabolic changes on the pathophysiology of Pa infection.
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Affiliation(s)
- Perrine Bortolotti
- Université Lille CHU Lille, EA 7366 - Recherche translationnelle: relations hôte pathogènes, F-59000, Lille, France
| | - Benjamin Hennart
- Laboratoire de Toxicologie - Pôle de Biologie-Pathologie-Génétique - CHRU de Lille - France, EA4483 - IMPECS, Université Lille Nord de France, Lille, France
| | - Camille Thieffry
- Université Lille CHU Lille, EA 7366 - Recherche translationnelle: relations hôte pathogènes, F-59000, Lille, France
| | - Guillaume Jausions
- Université Lille CHU Lille, EA 7366 - Recherche translationnelle: relations hôte pathogènes, F-59000, Lille, France
| | - Emmanuel Faure
- Université Lille CHU Lille, EA 7366 - Recherche translationnelle: relations hôte pathogènes, F-59000, Lille, France
| | - Teddy Grandjean
- Translational host pathogen research group, Faculté de Médecine de Lille UDSL, Univ Lille Nord de France, Lille, France
| | - Marion Thepaut
- Translational host pathogen research group, Faculté de Médecine de Lille UDSL, Univ Lille Nord de France, Lille, France
| | - Rodrigue Dessein
- Translational host pathogen research group, Faculté de Médecine de Lille UDSL, Univ Lille Nord de France, Lille, France
| | - Delphine Allorge
- Laboratoire de Toxicologie - Pôle de Biologie-Pathologie-Génétique - CHRU de Lille - France, EA4483 - IMPECS, Université Lille Nord de France, Lille, France
| | - Benoit P Guery
- Faculté de Médecine de Lille UDSL, Univ Lille Nord de France, Lille, France
| | - Karine Faure
- Translational host pathogen research group, Faculté de Médecine de Lille UDSL, Univ Lille Nord de France, Lille, France
| | - Eric Kipnis
- Translational host pathogen research group, Faculté de Médecine de Lille UDSL, Univ Lille Nord de France, Lille, France
| | - Bertrand Toussaint
- Laboratoire TIMC-TheREx (UMR5525 CNRS-UGA) Université Grenoble Alpes, Faculté de médecine, La Tronche, France.,Unité médicale de Biochimie des enzymes et des protéines, CHUGA de Grenoble , CS10207, Grenoble, 38043, Rhone alpes, France
| | - Audrey Le Gouellec
- Laboratoire TIMC-TheREx (UMR5525 CNRS-UGA) Université Grenoble Alpes, Faculté de médecine, La Tronche, France. .,Unité médicale de Biochimie des enzymes et des protéines, CHUGA de Grenoble , CS10207, Grenoble, 38043, Rhone alpes, France.
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30
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Monzon O, Yang Y, Li Q, Alvarez PJ. Quorum sensing autoinducers enhance biofilm formation and power production in a hypersaline microbial fuel cell. Biochem Eng J 2016. [DOI: 10.1016/j.bej.2016.01.023] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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31
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Salvaggio F, Hodgkinson JT, Carro L, Geddis SM, Galloway WRJD, Welch M, Spring DR. The Synthesis of Quinolone Natural Products fromPseudonocardiasp. European J Org Chem 2015. [PMCID: PMC4744947 DOI: 10.1002/ejoc.201501400] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The synthesis of four quinolone natural products from the actinomycete Pseudonocardia sp. is reported. The key step involved a sp2–sp3 Suzuki–Miyaura reaction between a common boronic ester lateral chain and various functionalised quinolone cores. The quinolones slowed growth of E. coli and S. aureus by inducing extended lag phases.
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Affiliation(s)
- Flavia Salvaggio
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK, http://www‐spring.ch.cam.ac.uk
| | - James T. Hodgkinson
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK, http://www‐spring.ch.cam.ac.uk
| | - Laura Carro
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK, http://www‐spring.ch.cam.ac.uk
| | - Stephen M. Geddis
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK, http://www‐spring.ch.cam.ac.uk
| | - Warren R. J. D. Galloway
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK, http://www‐spring.ch.cam.ac.uk
| | - Martin Welch
- Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge CB2 1GA, UK, http://www3.bioc.cam.ac.uk/welch
| | - David R. Spring
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK, http://www‐spring.ch.cam.ac.uk
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32
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Inaba T, Oura H, Morinaga K, Toyofuku M, Nomura N. The Pseudomonas Quinolone Signal Inhibits Biofilm Development of Streptococcus mutans. Microbes Environ 2015; 30:189-91. [PMID: 25854411 PMCID: PMC4462930 DOI: 10.1264/jsme2.me14140] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Bacteria often thrive in natural environments through a sessile mode of growth, known as the biofilm. Biofilms are well-structured communities and their formation is tightly regulated. However, the mechanisms by which interspecies interactions alter the formation of biofilms have not yet been elucidated in detail. We herein demonstrated that a quorum-sensing signal in Pseudomonas aeruginosa (the Pseudomonas quinolone signal; PQS) inhibited biofilm formation by Streptococcus mutans. Although the PQS did not affect cell growth, biofilm formation was markedly inhibited. Our results revealed a unique role for this multifunctional PQS and also indicated its application in the development of prophylactic agents against caries-causing S. mutans.
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Affiliation(s)
- Tomohiro Inaba
- Graduate School of Life and Environmental Sciences, University of Tsukuba
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33
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Pezzoni M, Meichtry M, Pizarro RA, Costa CS. Role of the Pseudomonas quinolone signal (PQS) in sensitising Pseudomonas aeruginosa to UVA radiation. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2015; 142:129-40. [DOI: 10.1016/j.jphotobiol.2014.11.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2014] [Revised: 11/20/2014] [Accepted: 11/24/2014] [Indexed: 10/24/2022]
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34
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Comparative genome analysis and identification of competitive and cooperative interactions in a polymicrobial disease. ISME JOURNAL 2014; 9:629-42. [PMID: 25171331 PMCID: PMC4331577 DOI: 10.1038/ismej.2014.155] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Revised: 07/11/2014] [Accepted: 07/17/2014] [Indexed: 12/17/2022]
Abstract
Polymicrobial diseases are caused by combinations of multiple bacteria, which can lead to not only mild but also life-threatening illnesses. Periodontitis represents a polymicrobial disease; Porphyromonas gingivalis, Treponema denticola and Tannerella forsythia, called ‘the red complex', have been recognized as the causative agents of periodontitis. Although molecular interactions among the three species could be responsible for progression of periodontitis, the relevant genetic mechanisms are unknown. In this study, we uncovered novel interactions in comparative genome analysis among the red complex species. Clustered regularly interspaced short palindromic repeats (CRISPRs) of T. forsythia might attack the restriction modification system of P. gingivalis, and possibly work as a defense system against DNA invasion from P. gingivalis. On the other hand, gene deficiencies were mutually compensated in metabolic pathways when the genes of all the three species were taken into account, suggesting that there are cooperative relationships among the three species. This notion was supported by the observation that each of the three species had its own virulence factors, which might facilitate persistence and manifestations of virulence of the three species. Here, we propose new mechanisms of bacterial symbiosis in periodontitis; these mechanisms consist of competitive and cooperative interactions. Our results might shed light on the pathogenesis of periodontitis and of other polymicrobial diseases.
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35
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O'Connell KMG, Hodgkinson JT, Sore HF, Welch M, Salmond GPC, Spring DR. Die Bekämpfung multiresistenter Bakterien: aktuelle Strategien zur Entdeckung neuer Antibiotika. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201209979] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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36
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O'Connell KMG, Hodgkinson JT, Sore HF, Welch M, Salmond GPC, Spring DR. Combating Multidrug-Resistant Bacteria: Current Strategies for the Discovery of Novel Antibacterials. Angew Chem Int Ed Engl 2013; 52:10706-33. [DOI: 10.1002/anie.201209979] [Citation(s) in RCA: 310] [Impact Index Per Article: 28.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2012] [Revised: 02/25/2013] [Indexed: 11/07/2022]
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37
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Engineering PQS biosynthesis pathway for enhancement of bioelectricity production in pseudomonas aeruginosa microbial fuel cells. PLoS One 2013; 8:e63129. [PMID: 23700414 PMCID: PMC3659106 DOI: 10.1371/journal.pone.0063129] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2013] [Accepted: 03/28/2013] [Indexed: 01/26/2023] Open
Abstract
The biosynthesis of the redox shuttle, phenazines, in Pseudomonas aeruginosa, an ubiquitous microorganism in wastewater microflora, is regulated by the 2-heptyl-3,4-dihydroxyquinoline (PQS) quorum-sensing system. However, PQS inhibits anaerobic growth of P. aeruginosa. We constructed a P. aeruginosa strain that produces higher concentrations of phenazines under anaerobic conditions by over-expressing the PqsE effector in a PQS negative ΔpqsC mutant. The engineered strain exhibited an improved electrical performance in microbial fuel cells (MFCs) and potentiostat-controlled electrochemical cells with an approximate five-fold increase of maximum current density relative to the parent strain. Electrochemical analysis showed that the current increase correlates with an over-synthesis of phenazines. These results therefore demonstrate that targeting microbial cell-to-cell communication by genetic engineering is a suitable technique to improve power output of bioelectrochemical systems.
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38
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Tashiro Y, Yawata Y, Toyofuku M, Uchiyama H, Nomura N. Interspecies interaction between Pseudomonas aeruginosa and other microorganisms. Microbes Environ 2013; 28:13-24. [PMID: 23363620 PMCID: PMC4070684 DOI: 10.1264/jsme2.me12167] [Citation(s) in RCA: 106] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Microbes interact with each other in multicellular communities and this interaction enables certain microorganisms to survive in various environments. Pseudomonas aeruginosa is a highly adaptable bacterium that ubiquitously inhabits diverse environments including soil, marine habitats, plants and animals. Behind this adaptivity, P. aeruginosa has abilities not only to outcompete others but also to communicate with each other to develop a multispecies community. In this review, we focus on how P. aeruginosa interacts with other microorganisms. P. aeruginosa secretes antimicrobial chemicals to compete and signal molecules to cooperate with other organisms. In other cases, it directly conveys antimicrobial enzymes to other bacteria using the Type VI secretion system (T6SS) or membrane vesicles (MVs). Quorum sensing is a central regulatory system used to exert their ability including antimicrobial effects and cooperation with other microbes. At least three quorum sensing systems are found in P. aeruginosa, Las, Rhl and Pseudomonas quinolone signal (PQS) systems. These quorum-sensing systems control the synthesis of extracellular antimicrobial chemicals as well as interaction with other organisms via T6SS or MVs. In addition, we explain the potential of microbial interaction analysis using several micro devices, which would bring fresh sensitivity to the study of interspecies interaction between P. aeruginosa and other organisms.
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Affiliation(s)
- Yosuke Tashiro
- Division of Environmental Engineering, Hokkaido University, Hokkaido, Japan
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39
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Social Behaviours under Anaerobic Conditions in Pseudomonas aeruginosa. Int J Microbiol 2012; 2012:405191. [PMID: 22518142 PMCID: PMC3299288 DOI: 10.1155/2012/405191] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2011] [Revised: 10/03/2011] [Accepted: 10/20/2011] [Indexed: 12/21/2022] Open
Abstract
Pseudomonas aeruginosa is well adapted to grow in anaerobic environments in the presence of nitrogen oxides by generating energy through denitrification. Environmental cues, such as oxygen and nitrogen oxide concentrations, are important in regulating the gene expression involved in this process. Recent data indicate that P. aeruginosa also employs cell-to-cell communication signals to control the denitrifying activity. The regulation of denitrification by these signalling molecules may control nitric oxide production. Nitric oxide, in turn, functions as a signalling molecule by activating certain regulatory proteins. Moreover, under denitrifying conditions, drastic changes in cell physiology and cell morphology are induced that significantly impact group behaviours, such as biofilm formation.
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Tashiro Y, Uchiyama H, Nomura N. Multifunctional membrane vesicles in Pseudomonas aeruginosa. Environ Microbiol 2011; 14:1349-62. [PMID: 22103313 DOI: 10.1111/j.1462-2920.2011.02632.x] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Gram-negative bacteria secrete small particles called membrane vesicles (MVs) into the extracellular milieu. While MVs have important roles in delivering toxins from pathogenic bacteria to eukaryotic cells, these vesicles also play ecological roles necessary for survival in various environmental conditions. Pseudomonas aeruginosa, which lives in soil, ocean, plant, animal and human environments, has become a model organism for studying these small extracellular particles. Such studies have increased our understanding of the function and biogenesis of bacterial MVs. Pseudomonas aeruginosa MVs possess versatile components and chemical substances with unique structures. These characteristics allow MVs to play their multifunctional biological roles, including microbial interaction, maintenance of biofilm structure and host infection. This review summarizes the comprehensive biochemical and physiochemical properties of MVs derived from P. aeruginosa. These studies will help us understand their biological roles of MVs not only in pathogenicity but also in microbial ecology. Also, the mechanisms of MV production, as currently understood, are discussed.
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Affiliation(s)
- Yosuke Tashiro
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan
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Tashiro Y, Ichikawa S, Nakajima-Kambe T, Uchiyama H, Nomura N. Pseudomonas quinolone signal affects membrane vesicle production in not only gram-negative but also gram-positive bacteria. Microbes Environ 2011; 25:120-5. [PMID: 21576862 DOI: 10.1264/jsme2.me09182] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Many Gram-negative bacteria naturally produce membrane vesicles (MVs) to the extracellular milieu. The Pseudomonas quinolone signal (PQS), a quorum-sensing signal of Pseudomonas aeruginosa, is a positive regulator of MV production. In this study, we investigated its effects on MV production in other Gram-negative and -positive bacterial species. The addition of PQS to an Escherichia coli K12 culture resulted in increased MV production and enlarged MVs. An excessive amount of MgCl(2) repressed E. coli MV production either with or without PQS, suggesting that an anionic repulsion of cellular surfaces increases MV production. PQS was found in the cellular membrane and MVs in E. coli. The enhancement of MV production by PQS occurred in other Gram-negative bacteria, including Burkholderia and Pseudomonas species. Moreover, PQS induced MV production in a Gram-positive bacterium, Bacillus subtilis 168, which does not normally produce MV under laboratory conditions. An excessive amount of MgCl(2) did not repress B. subtilis MV production in the presence of PQS, suggesting the production mechanism to be different from that in Gram-negative bacteria. Together, these results indicated that PQS enhances MV production in Gram-negative bacteria and induces it in Gram-positive bacteria.
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Affiliation(s)
- Yosuke Tashiro
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1–1–1 Tennodai, Tsukuba, Ibaraki 305–8572, Japan
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Okabe S, Oshiki M, Kamagata Y, Yamaguchi N, Toyofuku M, Yawata Y, Tashiro Y, Nomura N, Ohta H, Ohkuma M, Hiraishi A, Minamisawa K. A great leap forward in microbial ecology. Microbes Environ 2011; 25:230-40. [PMID: 21576878 DOI: 10.1264/jsme2.me10178] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Ribosomal RNA (rRNA) sequence-based molecular techniques emerged in the late 1980s, which completely changed our general view of microbial life. Coincidentally, the Japanese Society of Microbial Ecology (JSME) was founded, and its official journal "Microbes and Environments (M&E)" was launched, in 1985. Thus, the past 25 years have been an exciting and fruitful period for M&E readers and microbiologists as demonstrated by the numerous excellent papers published in M&E. In this minireview, recent progress made in microbial ecology and related fields is summarized, with a special emphasis on 8 landmark areas; the cultivation of uncultured microbes, in situ methods for the assessment of microorganisms and their activities, biofilms, plant microbiology, chemolithotrophic bacteria in early volcanic environments, symbionts of animals and their ecology, wastewater treatment microbiology, and the biodegradation of hazardous organic compounds.
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Affiliation(s)
- Satoshi Okabe
- Faculty of Engineering, Hokkaido University, Sapporo, Hokkaido 060–8628, Japan.
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Hosono Honda N, Kimura S, Tateda K, Horikawa M, Ueda C, Ishii Y, Ishiguro M, Miyairi S, Yamaguchi K. Roles of Pseudomonas aeruginosa Autoinducers and their Degradation Products, Tetramic acids, in Bacterial Survival and Behavior in Ecological Niches. Microbes Environ 2011; 26:160-4. [DOI: 10.1264/jsme2.me10198] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Natsue Hosono Honda
- Department of Microbiology and Infectious Diseases, Toho University School of Medicine
| | - Soichiro Kimura
- Department of Microbiology and Infectious Diseases, Toho University School of Medicine
| | - Kazuhiro Tateda
- Department of Microbiology and Infectious Diseases, Toho University School of Medicine
| | | | - Chihiro Ueda
- Department of Microbiology and Infectious Diseases, Toho University School of Medicine
| | - Yoshikazu Ishii
- Department of Microbiology and Infectious Diseases, Toho University School of Medicine
| | | | - Shinichi Miyairi
- Nihon University College of Pharmacy, Laboratory of Bio-organic Chemistry
| | - Keizo Yamaguchi
- Department of Microbiology and Infectious Diseases, Toho University School of Medicine
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Variation of physiochemical properties and cell association activity of membrane vesicles with growth phase in Pseudomonas aeruginosa. Appl Environ Microbiol 2010; 76:3732-9. [PMID: 20382806 DOI: 10.1128/aem.02794-09] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Pseudomonas aeruginosa and other Gram-negative bacteria release membrane vesicles (MVs) from their surfaces, and MVs have an ability to interact with bacterial cells. Although it has been known that many bacteria have mechanisms that control their phenotypes with the transition from exponential phase to stationary phase, changes of properties in released MVs have been poorly understood. Here, we demonstrate that MVs released by P. aeruginosa during the exponential and stationary phases possess different physiochemical properties. MVs purified from the stationary phase had higher buoyant densities than did those purified from the exponential phase. Surface charge, characterized by zeta potential, of MVs tended to be more negative as the growth shifted to the stationary phase, although the charges of PAO1 cells were not altered. Pseudomonas quinolone signal (PQS), one of the regulators related to MV production in P. aeruginosa, was lower in MVs purified from the exponential phase than in those from the stationary phase. MVs from the stationary phase more strongly associated with P. aeruginosa cells than did those from the exponential phase. Our findings suggest that properties of MVs are altered to readily interact with bacterial cells along with the growth transition in P. aeruginosa.
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Khan NH, Ahsan M, Taylor WD, Kogure K. Culturability and Survival of Marine, Freshwater and Clinical Pseudomonas aeruginosa. Microbes Environ 2010; 25:266-74. [DOI: 10.1264/jsme2.me09178] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Nurul H. Khan
- Marine Microbiology Laboratory, Marine Ecosystem Dynamics, Ocean Research Institute, The University of Tokyo
- Department of Biology, Faculty of Science, University of Waterloo
| | - Mahbuba Ahsan
- Marine Microbiology Laboratory, Marine Ecosystem Dynamics, Ocean Research Institute, The University of Tokyo
| | | | - Kazuhiro Kogure
- Marine Microbiology Laboratory, Marine Ecosystem Dynamics, Ocean Research Institute, The University of Tokyo
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