1
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Peña-Díaz J, Woodward SE, Creus-Cuadros A, Serapio-Palacios A, Ortiz-Jiménez S, Deng W, Finlay BB. Quorum sensing modulates bacterial virulence and colonization dynamics of the gastrointestinal pathogen Citrobacter rodentium. Gut Microbes 2023; 15:2267189. [PMID: 37842938 PMCID: PMC10580866 DOI: 10.1080/19490976.2023.2267189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Accepted: 10/02/2023] [Indexed: 10/17/2023] Open
Abstract
Quorum Sensing (QS) is a form of cell-to-cell communication that enables bacteria to modify behavior according to their population density. While QS has been proposed as a potential intervention against pathogen infection, QS-mediated communication within the mammalian digestive tract remains understudied. Using an LC-MS/MS approach, we discovered that Citrobacter rodentium, a natural murine pathogen used to model human infection by pathogenic Escherichia coli, utilizes the CroIR system to produce three QS-molecules. We then profiled their accumulation both in vitro and across different gastrointestinal sites over the course of infection. Importantly, we found that in the absence of QS capabilities the virulence of C. rodentium is enhanced. This highlights the role of QS as an effective mechanism to regulate virulence according to the pathogen's spatio-temporal context to optimize colonization and transmission success. These results also demonstrate that inhibiting QS may not always be an effective strategy for the control of virulence.
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Affiliation(s)
- Jorge Peña-Díaz
- Department of Microbiology and Immunology, University of British Columbia, Vancouver, BC, Canada
- Michael Smith Laboratories, University of British Columbia, Vancouver, BC, Canada
| | - Sarah E. Woodward
- Department of Microbiology and Immunology, University of British Columbia, Vancouver, BC, Canada
- Michael Smith Laboratories, University of British Columbia, Vancouver, BC, Canada
| | - Anna Creus-Cuadros
- Department of Microbiology and Immunology, University of British Columbia, Vancouver, BC, Canada
- Michael Smith Laboratories, University of British Columbia, Vancouver, BC, Canada
| | - Antonio Serapio-Palacios
- Department of Microbiology and Immunology, University of British Columbia, Vancouver, BC, Canada
- Michael Smith Laboratories, University of British Columbia, Vancouver, BC, Canada
| | - Stephanie Ortiz-Jiménez
- Departamento de Microbiología Molecular, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca, Morelos, México
| | - Wanyin Deng
- Michael Smith Laboratories, University of British Columbia, Vancouver, BC, Canada
| | - B. Brett Finlay
- Department of Microbiology and Immunology, University of British Columbia, Vancouver, BC, Canada
- Michael Smith Laboratories, University of British Columbia, Vancouver, BC, Canada
- Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, BC, Canada
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2
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Wiechmann A, Garcia V, Elton L, Williams P, Atkinson S. Reciprocal regulation of NagC and quorum sensing systems and their roles in hmsHFRS expression and biofilm formation in Yersinia pseudotuberculosis. MICROBIOLOGY (READING, ENGLAND) 2023; 169:001397. [PMID: 37815525 PMCID: PMC10634360 DOI: 10.1099/mic.0.001397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 09/27/2023] [Indexed: 10/11/2023]
Abstract
Biofilm formation by Yersinia pseudotuberculosis is regulated by quorum sensing (QS) and dependent on the haemin storage locus hms , required for the extracellular polysaccharide poly-N -acetylglucosamine (poly-GlcNAc) production. In Escherichia coli NagC regulates both GlcNAc biosynthesis and metabolism with GlcNAc acting as a signal that co-ordinates these and other activities. However, the contribution of NagC and GlcNAc to biofilm development in Y. pseudotuberculosis is not known. Here we show that a Y. pseudotuberculosis nagC mutant is impaired for biofilm production on abiotic (glass) and biotic (Caenorhabitis elegans ) surfaces. Genetic complementation restored poly-GlcNAc production and biofilm formation on C. elegans . Using lux -based promoter fusions, hmsHFRS expression was found to be nagC dependent. Given that NagC and QS both regulate aggregation and biofilm formation, we investigated their regulatory relationship using lux -based promoter fusions. These revealed that (i) nagC is negatively autoregulated, but expression can be partially restored in the nagC mutant by exogenous GlcNAc, (ii) NagC negatively regulates the ytbI and ypsI QS genes and (iii) nagC expression is reduced in the ytbI , ypsI and ypsR mutants but not the ytbR mutant. These data establish the existence of a reciprocal regulatory relationship between NagC and QS, which in the case of the luxRI pair ytbRI , is also GlcNAc-dependent. NagC and GlcNAc are therefore components of a regulatory system involving QS that modulates biofilm formation and aggregation.
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Affiliation(s)
- Anja Wiechmann
- Biodiscovery Institute, School of Life Sciences, University of Nottingham, Nottingham, NG7 2RD, UK
| | - Vanina Garcia
- Biodiscovery Institute, School of Life Sciences, University of Nottingham, Nottingham, NG7 2RD, UK
| | - Linzy Elton
- Biodiscovery Institute, School of Life Sciences, University of Nottingham, Nottingham, NG7 2RD, UK
- Present address: Division of Infection and Immunity, University College, London, WC1E 6BT, UK
| | - Paul Williams
- Biodiscovery Institute, School of Life Sciences, University of Nottingham, Nottingham, NG7 2RD, UK
| | - Steve Atkinson
- Biodiscovery Institute, School of Life Sciences, University of Nottingham, Nottingham, NG7 2RD, UK
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3
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Identification of AHL Synthase in Desulfovibrio vulgaris Hildenborough Using an In-Silico Methodology. Catalysts 2023. [DOI: 10.3390/catal13020364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023] Open
Abstract
Sulfate-reducing bacteria (SRB) are anaerobic bacteria that form biofilm and induce corrosion on various material surfaces. The quorum sensing (QS) system that employs acyl homoserine lactone (AHL)-type QS molecules primarily govern biofilm formation. Studies on SRB have reported the presence of AHL, but no AHL synthase have been annotated in SRB so far. In this computational study, we used a combination of data mining, multiple sequence alignment (MSA), homology modeling and docking to decode a putative AHL synthase in the model SRB, Desulfovibrio vulgaris Hildenborough (DvH). Through data mining, we shortlisted 111 AHL synthase genes. Conserved domain analysis of 111 AHL synthase genes generated a consensus sequence. Subsequent MSA of the consensus sequence with DvH genome indicated that DVU_2486 (previously uncharacterized protein from acetyltransferase family) is the gene encoding for AHL synthase. Homology modeling revealed the existence of seven α-helices and six β sheets in the DvH AHL synthase. The amalgamated study of hydrophobicity, binding energy, and tunnels and cavities revealed that Leu99, Trp104, Arg139, Trp97, and Tyr36 are the crucial amino acids that govern the catalytic center of this putative synthase. Identifying AHL synthase in DvH would provide more comprehensive knowledge on QS mechanism and help design strategies to control biofilm formation.
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4
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Uroz S, Geisler O, Fauchery L, Lami R, Rodrigues AMS, Morin E, Leveau JHJ, Oger P. Genomic and transcriptomic characterization of the Collimonas quorum sensing genes and regulon. FEMS Microbiol Ecol 2022; 98:6679101. [PMID: 36040340 DOI: 10.1093/femsec/fiac100] [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: 05/22/2022] [Revised: 07/13/2022] [Accepted: 08/26/2022] [Indexed: 01/21/2023] Open
Abstract
Collimonads are well-adapted to nutrient-poor environments. They are known to hydrolyse chitin, produce antifungal metabolites, weather minerals, and are effective biocontrol agents protecting plants from fungal diseases. The production of N-acyl homoserine lactones (AHLs) was suggested to be a conserved trait of collimonads, but little is known about the genes that underlie this production or the genes that are controlled by AHLs. To improve our understanding of the role of AHLs in the ecology of collimonads, we carried out transcriptomic analyses, combined with chemical and functional assays, on strain Collimonas pratensis PMB3(1). The main AHLs produced by this strain were identified as 3-hydroxy-hexa- and octa-noyl-homoserine lactone. Genome analysis permitted to identify putative genes coding for the autoinducer synthase (colI) and cognate transcriptional regulator (colR). The ability to produce AHLs was lost in ΔcolI and ΔcolR mutants. Functional assays revealed that the two mutants metabolized glucose, formate, oxalate, and leucine better than the wild-type (WT) strain. Transcriptome sequencing analyses revealed an up-regulation of different metabolic pathways and of motility in the QS-mutants compared to the WT strain. Overall, our results provide insights into the role of the AHL-dependent regulation system of Collimonas in environment colonization, metabolism readjustment, and microbial interactions.
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Affiliation(s)
- Stephane Uroz
- Université de Lorraine, INRAE, UMR1136 "Interactions Arbres-Microorganismes", F-54280 Champenoux, France.,INRAE, UR1138 "Biogéochimie des écosystèmes forestiers", F-54280 Champenoux, France
| | - Océane Geisler
- Université de Lorraine, INRAE, UMR1136 "Interactions Arbres-Microorganismes", F-54280 Champenoux, France
| | - Laure Fauchery
- Université de Lorraine, INRAE, UMR1136 "Interactions Arbres-Microorganismes", F-54280 Champenoux, France
| | - Raphaël Lami
- Sorbonne Université, CNRS, Laboratoire de Biodiversité et Biotechnologies Microbiennes (LBBM, USR3579), Fédération de Recherche FR3724, Observatoire Océanologique, 66650 Banyuls-sur-Mer, France
| | - Alice M S Rodrigues
- Sorbonne Université, CNRS, Laboratoire de Biodiversité et Biotechnologies Microbiennes (LBBM, USR3579), Fédération de Recherche FR3724, Observatoire Océanologique, 66650 Banyuls-sur-Mer, France
| | - Emmanuelle Morin
- Université de Lorraine, INRAE, UMR1136 "Interactions Arbres-Microorganismes", F-54280 Champenoux, France
| | - Johan H J Leveau
- Department of Plant Pathology, University of California - Davis, Davis, CA 95616, United States
| | - Philippe Oger
- Université Lyon, INSA de Lyon, CNRS UMR 5240, F-69622 Villeurbanne, France
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5
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Romero M, Mayer C, Heeb S, Wattanavaekin K, Cámara M, Otero A, Williams P. Mushroom-shaped structures formed in Acinetobacter baumannii biofilms grown in a roller bioreactor are associated with quorum sensing-dependent Csu-pilus assembly. Environ Microbiol 2022; 24:4329-4339. [PMID: 35352448 PMCID: PMC9790458 DOI: 10.1111/1462-2920.15985] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Revised: 02/11/2022] [Accepted: 03/21/2022] [Indexed: 12/31/2022]
Abstract
There is currently a need to develop simple biofilm models that facilitate investigation of the architecture/biology of mature bacterial biofilms in a consistent/standardized manner given their environmental and clinical importance and the need for new anti-biofilm interventions. This study introduces a novel biofilm culture system termed the rolling biofilm bioreactor (RBB). This easily operated system allows adherent microbial cells to be repeatedly exposed to air/solid/liquid interfaces optimizing biofilm growth. The RBB was exploited to investigate biofilm formation in Acinetobacter baumannii. High levels of A. baumannii biofilm biomass reproducibly accumulate in the RBB and, importantly, undergo a maturation step to form large mushroom-shaped structures that had not been observed in other models. Based on image analysis of biofilm development and genetic manipulation, we show how N-acylhomoserine lactone-dependent quorum sensing (QS) impacts on biofilm differentiation, composition and antibiotic tolerance. Our results indicate that extracellular DNA (eDNA) is a key matrix component in mature Acinetobacter biofilms as the mushroom-like structures consist of dense cellular masses encased in an eDNA mesh. Moreover, this study reveals the contribution of QS to A. baumannii biofilm differentiation through Csu pilus assembly regulation. Understanding the mechanisms of structural development of mature biofilms helps to identify new biofilm eradication and removal strategies.
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Affiliation(s)
- Manuel Romero
- National Biofilms Innovation Centre, Biodiscovery Institute and School of Life SciencesUniversity of NottinghamNottinghamUK
| | - Celia Mayer
- National Biofilms Innovation Centre, Biodiscovery Institute and School of Life SciencesUniversity of NottinghamNottinghamUK,Instituto de Investigacion Sanitaria de Santiago de Compostela (IDIS)Santiago de CompostelaSpain
| | - Stephan Heeb
- National Biofilms Innovation Centre, Biodiscovery Institute and School of Life SciencesUniversity of NottinghamNottinghamUK
| | | | - Miguel Cámara
- National Biofilms Innovation Centre, Biodiscovery Institute and School of Life SciencesUniversity of NottinghamNottinghamUK
| | - Ana Otero
- Departamento de Microbioloxía e Parasitoloxía, Facultade de Bioloxía, Edificio CIBUSUniversidade de Santiago de CompostelaSantiago de CompostelaSpain
| | - Paul Williams
- National Biofilms Innovation Centre, Biodiscovery Institute and School of Life SciencesUniversity of NottinghamNottinghamUK
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6
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Complete genome sequence of fish-pathogenic Aeromonas hydrophila HX-3 and a comparative analysis: insights into virulence factors and quorum sensing. Sci Rep 2020; 10:15479. [PMID: 32968153 PMCID: PMC7512022 DOI: 10.1038/s41598-020-72484-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Accepted: 08/31/2020] [Indexed: 12/19/2022] Open
Abstract
The gram-negative, aerobic, rod-shaped bacterium Aeromonas hydrophila, the causative agent of motile aeromonad septicaemia, has attracted increasing attention due to its high pathogenicity. Here, we constructed the complete genome sequence of a virulent strain, A. hydrophila HX-3 isolated from Pseudosciaena crocea and performed comparative genomics to investigate its virulence factors and quorum sensing features in comparison with those of other Aeromonas isolates. HX-3 has a circular chromosome of 4,941,513 bp with a 61.0% G + C content encoding 4483 genes, including 4318 protein-coding genes, and 31 rRNA, 127 tRNA and 7 ncRNA operons. Seventy interspersed repeat and 153 tandem repeat sequences, 7 transposons, 8 clustered regularly interspaced short palindromic repeats, and 39 genomic islands were predicted in the A. hydrophila HX-3 genome. Phylogeny and pan-genome were also analyzed herein to confirm the evolutionary relationships on the basis of comparisons with other fully sequenced Aeromonas genomes. In addition, the assembled HX-3 genome was successfully annotated against the Cluster of Orthologous Groups of proteins database (76.03%), Gene Ontology database (18.13%), and Kyoto Encyclopedia of Genes and Genome pathway database (59.68%). Two-component regulatory systems in the HX-3 genome and virulence factors profiles through comparative analysis were predicted, providing insights into pathogenicity. A large number of genes related to the AHL-type 1 (ahyI, ahyR), LuxS-type 2 (luxS, pfs, metEHK, litR, luxOQU) and QseBC-type 3 (qseB, qseC) autoinducer systems were also identified. As a result of the expression of the ahyI gene in Escherichia coli BL21 (DE3), combined UPLC-MS/MS profiling led to the identification of several new N-acyl-homoserine lactone compounds synthesized by AhyI. This genomic analysis determined the comprehensive QS systems of A. hydrophila, which might provide novel information regarding the mechanisms of virulence signatures correlated with QS.
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7
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Fei C, Ochsenkühn MA, Shibl AA, Isaac A, Wang C, Amin SA. Quorum sensing regulates 'swim-or-stick' lifestyle in the phycosphere. Environ Microbiol 2020; 22:4761-4778. [PMID: 32896070 PMCID: PMC7693213 DOI: 10.1111/1462-2920.15228] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 09/03/2020] [Accepted: 09/04/2020] [Indexed: 12/12/2022]
Abstract
Interactions between phytoplankton and bacteria play major roles in global biogeochemical cycles and oceanic nutrient fluxes. These interactions occur in the microenvironment surrounding phytoplankton cells, known as the phycosphere. Bacteria in the phycosphere use either chemotaxis or attachment to benefit from algal excretions. Both processes are regulated by quorum sensing (QS), a cell–cell signalling mechanism that uses small infochemicals to coordinate bacterial gene expression. However, the role of QS in regulating bacterial attachment in the phycosphere is not clear. Here, we isolated a Sulfitobacter pseudonitzschiae F5 and a Phaeobacter sp. F10 belonging to the marine Roseobacter group and an Alteromonas macleodii F12 belonging to Alteromonadaceae, from the microbial community of the ubiquitous diatom Asterionellopsis glacialis. We show that only the Roseobacter group isolates (diatom symbionts) can attach to diatom transparent exopolymeric particles. Despite all three bacteria possessing genes involved in motility, chemotaxis, and attachment, only S. pseudonitzschiae F5 and Phaeobacter sp. F10 possessed complete QS systems and could synthesize QS signals. Using UHPLC–MS/MS, we identified three QS molecules produced by both bacteria of which only 3‐oxo‐C16:1‐HSL strongly inhibited bacterial motility and stimulated attachment in the phycosphere. These findings suggest that QS signals enable colonization of the phycosphere by algal symbionts.
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Affiliation(s)
- Cong Fei
- Marine Microbial Ecology Lab, Biology Program, New York University Abu Dhabi, Abu Dhabi, United Arab Emirates.,College of Resources and Environmental Science, Nanjing Agriculture University, Nanjing, China
| | - Michael A Ochsenkühn
- Marine Microbial Ecology Lab, Biology Program, New York University Abu Dhabi, Abu Dhabi, United Arab Emirates
| | - Ahmed A Shibl
- Marine Microbial Ecology Lab, Biology Program, New York University Abu Dhabi, Abu Dhabi, United Arab Emirates
| | - Ashley Isaac
- Marine Microbial Ecology Lab, Biology Program, New York University Abu Dhabi, Abu Dhabi, United Arab Emirates.,International Max Planck Research School of Marine Microbiology, University of Bremen, Bremen, Germany
| | - Changhai Wang
- College of Resources and Environmental Science, Nanjing Agriculture University, Nanjing, China
| | - Shady A Amin
- Marine Microbial Ecology Lab, Biology Program, New York University Abu Dhabi, Abu Dhabi, United Arab Emirates
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8
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Moura-Alves P, Puyskens A, Stinn A, Klemm M, Guhlich-Bornhof U, Dorhoi A, Furkert J, Kreuchwig A, Protze J, Lozza L, Pei G, Saikali P, Perdomo C, Mollenkopf HJ, Hurwitz R, Kirschhoefer F, Brenner-Weiss G, Weiner J, Oschkinat H, Kolbe M, Krause G, Kaufmann SHE. Host monitoring of quorum sensing during Pseudomonas aeruginosa infection. Science 2020; 366:366/6472/eaaw1629. [PMID: 31857448 DOI: 10.1126/science.aaw1629] [Citation(s) in RCA: 91] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2018] [Revised: 07/25/2019] [Accepted: 11/13/2019] [Indexed: 01/01/2023]
Abstract
Pseudomonas aeruginosa rapidly adapts to altered conditions by quorum sensing (QS), a communication system that it uses to collectively modify its behavior through the production, release, and detection of signaling molecules. QS molecules can also be sensed by hosts, although the respective receptors and signaling pathways are poorly understood. We describe a pattern of regulation in the host by the aryl hydrocarbon receptor (AhR) that is critically dependent on qualitative and quantitative sensing of P. aeruginosa quorum. QS molecules bind to AhR and distinctly modulate its activity. This is mirrored upon infection with P. aeruginosa collected from diverse growth stages and with QS mutants. We propose that by spying on bacterial quorum, AhR acts as a major sensor of infection dynamics, capable of orchestrating host defense according to the status quo of infection.
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Affiliation(s)
- Pedro Moura-Alves
- Department of Immunology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany. .,Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - Andreas Puyskens
- Department of Immunology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany
| | - Anne Stinn
- Department of Immunology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany.,Structural Systems Biology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany.,Department of Structural Infection Biology, Centre for Structural Systems Biology, Helmholtz Centre for Infection Research (HZI), 22607 Hamburg, Germany.,Faculty of Mathematics, Informatics and Natural Sciences, University of Hamburg, 20148 Hamburg, Germany
| | - Marion Klemm
- Department of Immunology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany
| | - Ute Guhlich-Bornhof
- Department of Immunology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany
| | - Anca Dorhoi
- Department of Immunology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany.,Institute of Immunology, Friedrich-Loeffler Institut, Greifswald-Insel Riems, Germany.,Faculty of Mathematics and Natural Sciences, University of Greifswald, Greifswald, Germany
| | - Jens Furkert
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), 13125 Berlin, Germany
| | - Annika Kreuchwig
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), 13125 Berlin, Germany
| | - Jonas Protze
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), 13125 Berlin, Germany
| | - Laura Lozza
- Department of Immunology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany.,Epiontis GmbH-Precision for Medicine, 12489 Berlin, Germany
| | - Gang Pei
- Department of Immunology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany
| | - Philippe Saikali
- Department of Immunology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany
| | - Carolina Perdomo
- Department of Immunology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany
| | - Hans J Mollenkopf
- Microarray Core Facility, Max Planck Institute for Infection Biology, Department of Immunology, 10117 Berlin, Germany
| | - Robert Hurwitz
- Protein Purification Core Facility, Max Planck Institute for Infection Biology, 10117 Berlin, Germany
| | - Frank Kirschhoefer
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Gerald Brenner-Weiss
- Protein Purification Core Facility, Max Planck Institute for Infection Biology, 10117 Berlin, Germany
| | - January Weiner
- Department of Immunology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany
| | - Hartmut Oschkinat
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), 13125 Berlin, Germany
| | - Michael Kolbe
- Structural Systems Biology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany.,Department of Structural Infection Biology, Centre for Structural Systems Biology, Helmholtz Centre for Infection Research (HZI), 22607 Hamburg, Germany.,Faculty of Mathematics, Informatics and Natural Sciences, University of Hamburg, 20148 Hamburg, Germany
| | - Gerd Krause
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), 13125 Berlin, Germany
| | - Stefan H E Kaufmann
- Department of Immunology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany. .,Hagler Institute for Advanced Study at Texas A&M University, College Station, TX 77843, USA
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9
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Jin L, Zhang X, Shi H, Wang W, Qiao Z, Yang W, Du W. Identification of a Novel N-Acyl Homoserine Lactone Synthase, AhyI, in Aeromonas hydrophila and Structural Basis for Its Substrate Specificity. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:2516-2527. [PMID: 32050067 DOI: 10.1021/acs.jafc.9b07833] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In the Gram-negative bacterium Aeromonas hydrophila, N-acyl homoserine lactone (AHL)-mediated quorum sensing (QS) influences pathogenicity, protein secretion, and motility. However, the catalytic mechanism of AHL biosynthesis and the structural basis and substrate specificity for AhyI members remain unclear. In this study, we cloned the ahyI gene from the isolate A. hydrophila HX-3, and the overexpressed AhyI protein was confirmed to produce six types of AHLs by ultraperformance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) analysis, contrasting with previous reports that AhyI only produces N-butanoyl-l-homoserine lactone (C4-HSL) and N-hexanoyl-l-homoserine lactone (C6-HSL). The results of an in vitro biosynthetic assay showed that purified AhyI can catalyze the formation of C4-HSL using S-adenosyl-l-methionine (SAM) and butyryl-acyl carrier protein (ACP) as substrates and indicated that the fatty acyl substrate used in AhyI-mediated AHL synthesis is derived from acyl-ACP rather than acyl-CoA. The kinetic data of AhyI using butyryl-ACP as an acyl substrate indicated that the catalytic efficiency of the A. hydrophila HX-3 AhyI enzyme is within an order of magnitude compared to other LuxI homologues. In this study, for the first time, the tertiary structural modeling results of AhyI and those of molecular docking and structural and functional analyses showed the importance of several crucial residues, as well as the secondary structure with respect to acylation. A Phe125-Phe152 clamp grasps the terminal methyl group to assist in stabilizing the long acyl chains in a putative binding pocket. The stacking interactions within a strong hydrophobic environment, a hydrogen-bonding network, and a β bulge presumably stabilize the ACP acyl chain for the attack of the SAM α-amine toward the thioester carbon, offering a relatively reasonable explanation for how AhyI can synthesize AHLs with diverse acyl-chain lengths. Moreover, Trp34 participates in forming the binding pocket for C4-ACP and becomes ordered upon SAM binding, providing a good basis for catalysis. The novel finding that AhyI can produce both short- and long-chain AHLs enhances current knowledge regarding the variety of AHLs produced by this enzyme. These structural data are expected to serve as a molecular rationale for AHL synthesis by AhyI.
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Affiliation(s)
- Lei Jin
- College of Food and Pharmaceutical Sciences , Ningbo University , Ningbo 315211 , P. R. China
- Key Laboratory of Animal Protein Food Deep Processing Technology of Zhejiang Province , Ningbo University , Ningbo 315211 , P. R. China
- Marine Fishery Research Institute of Zhejiang Province , Zhoushan 316021 , P. R. China
| | - Xiaojun Zhang
- Marine Fishery Research Institute of Zhejiang Province , Zhoushan 316021 , P. R. China
- Zhoushan Fishery Environments & Aquatic Products Quality Monitoring Center of Ministry of Agriculture China , Zhoushan 316021 , P. R. China
| | - Hui Shi
- Marine Fishery Research Institute of Zhejiang Province , Zhoushan 316021 , P. R. China
| | - Wei Wang
- Marine Fishery Research Institute of Zhejiang Province , Zhoushan 316021 , P. R. China
| | - Zhaohui Qiao
- College of Food and Pharmaceutical Sciences , Ningbo University , Ningbo 315211 , P. R. China
- Key Laboratory of Animal Protein Food Deep Processing Technology of Zhejiang Province , Ningbo University , Ningbo 315211 , P. R. China
| | - Wenge Yang
- College of Food and Pharmaceutical Sciences , Ningbo University , Ningbo 315211 , P. R. China
- Key Laboratory of Animal Protein Food Deep Processing Technology of Zhejiang Province , Ningbo University , Ningbo 315211 , P. R. China
| | - Wenyi Du
- Sichuan MoDe Technology Co., Ltd. , Chengdu 610000 , P. R. China
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10
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Prescott RD, Decho AW. Flexibility and Adaptability of Quorum Sensing in Nature. Trends Microbiol 2020; 28:436-444. [PMID: 32001099 DOI: 10.1016/j.tim.2019.12.004] [Citation(s) in RCA: 55] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 11/28/2019] [Accepted: 12/09/2019] [Indexed: 02/02/2023]
Abstract
Quorum sensing (QS), a type of chemical communication, allows bacteria to sense and coordinate activities in natural biofilm communities using N-acyl homoserine lactones (AHLs) as one type of signaling molecule. For AHL-based communication to occur, bacteria must produce and recognize the same signals, which activate similar genes in different species. Our current understanding of AHL-QS suggests that signaling between species would arise randomly, which is not probable. We propose that AHL-QS signaling is a mutable and adaptable process, within limits. AHLs are highly-conserved signals, however, their corresponding receptor proteins (LuxR) are highly variable. We suggest that both flexibility and adaptation occur among receptor proteins, allowing for complex signaling networks to develop in biofilms over time.
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Affiliation(s)
- Rebecca D Prescott
- School of Physics and Astronomy, University of Edinburgh, Edinburgh, EH9 3FD, UK; Microbial Interactions Laboratory, Department of Environmental Health Sciences, Arnold School of Public Health, University of South Carolina, Columbia, SC 29208, USA.
| | - Alan W Decho
- Microbial Interactions Laboratory, Department of Environmental Health Sciences, Arnold School of Public Health, University of South Carolina, Columbia, SC 29208, USA
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11
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Deciphering the Symbiotic Significance of Quorum Sensing Systems of Sinorhizobium fredii HH103. Microorganisms 2020; 8:microorganisms8010068. [PMID: 31906451 PMCID: PMC7022240 DOI: 10.3390/microorganisms8010068] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Revised: 12/26/2019] [Accepted: 12/31/2019] [Indexed: 01/21/2023] Open
Abstract
Quorum sensing (QS) is a bacterial cell-to-cell signaling mechanism that collectively regulates and synchronizes behaviors by means of small diffusible chemical molecules. In rhizobia, QS systems usually relies on the synthesis and detection of N-acyl-homoserine lactones (AHLs). In the model bacterium Sinorhizobium meliloti functions regulated by the QS systems TraI-TraR and SinI-SinR(-ExpR) include plasmid transfer, production of surface polysaccharides, motility, growth rate and nodulation. These systems are also present in other bacteria of the Sinorhizobium genus, with variations at the species and strain level. In Sinorhizobium fredii NGR234 phenotypes regulated by QS are plasmid transfer, growth rate, sedimentation, motility, biofilm formation, EPS production and copy number of the symbiotic plasmid (pSym). The analysis of the S. fredii HH103 genomes reveal also the presence of both QS systems. In this manuscript we characterized the QS systems of S. fredii HH103, determining that both TraI and SinI AHL-synthases proteins are responsible of the production of short- and long-chain AHLs, respectively, at very low and not physiological concentrations. Interestingly, the main HH103 luxR-type genes, expR and traR, are split into two ORFs, suggesting that in S. fredii HH103 the corresponding carboxy-terminal proteins, which contain the DNA-binding motives, may control target genes in an AHL-independent manner. The presence of a split traR gene is common in other S. fredii strains.
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12
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Webb K, Fogarty A, Barrett DA, Nash EF, Whitehouse JL, Smyth AR, Stewart I, Knox A, Williams P, Halliday N, Cámara M, Barr HL. Clinical significance of Pseudomonas aeruginosa 2-alkyl-4-quinolone quorum-sensing signal molecules for long-term outcomes in adults with cystic fibrosis. J Med Microbiol 2019; 68:1823-1828. [PMID: 31671047 DOI: 10.1099/jmm.0.001099] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Introduction. Pseudomonas aeruginosa is an important respiratory pathogen in cystic fibrosis (CF), which is associated with an accelerated decline in lung function, frequent pulmonary exacerbations and increased mortality. P. aeruginosa produces intercellular signalling molecules including 2-alkyl-4-quinolones (AQs), which regulate virulence-factor production and biofilm formation in the CF airways. Studies have shown that AQs are detectable in the sputum and plasma of adults with CF and chronic pulmonary P. aeruginosa.Aim. We tested the hypothesis that the presence of six AQs in plasma or sputum obtained from adults with CF was associated with long-term adverse clinical outcomes.Methodology. We analysed clinical data over an 8 year follow period for 90 people with CF who had previously provided samples for AQ analysis at clinical stability. The primary outcome was all cause mortality or lung transplantation. Secondary outcomes were the rate of lung-function decline and the number of intravenous (IV) antibiotic days for pulmonary exacerbations.Results. There was no statistical association between the presence of any of the six measured AQs and the primary outcomes or the secondary outcome of decline in lung function. One of the six AQs was associated with IV antibiotic usage. The presence of 2-nonyl-3-hydroxy-4(1 h)-quinolone (C9-PQS) in sputum was associated with an increase in the number of IV antibiotic days in the follow-up period (Mann-Whitney; P=0.011).Conclusion. Further investigation to confirm the hypothesis that C9-PQS may be associated with increased antibiotic usage for pulmonary exacerbations is warranted as AQ-dependent signalling is a potential future target for anti-virulence therapies.
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Affiliation(s)
- Karmel Webb
- Division of Epidemiology and Public Health, University of Nottingham, City Hospital Campus, Nottingham, UK
| | - Andrew Fogarty
- Division of Epidemiology and Public Health, University of Nottingham, City Hospital Campus, Nottingham, UK
| | - David A Barrett
- Centre for Analytical Bioscience, Division of Advanced Materials and Healthcare Technologies, School of Pharmacy, University of Nottingham, Nottingham, UK
| | - Edward F Nash
- West Midlands Adult CF Centre, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | - Joanna L Whitehouse
- West Midlands Adult CF Centre, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | - Alan R Smyth
- Division of Child Health, Obstetrics and Gynaecology, University of Nottingham, Nottingham, UK
| | - Iain Stewart
- Division of Respiratory Medicine, University of Nottingham, City Hospital Campus, Nottingham, UK
| | - Alan Knox
- Division of Respiratory Medicine, University of Nottingham, City Hospital Campus, Nottingham, UK
| | - Paul Williams
- National Biofilms Innovation Centre, Centre for Biomolecular Sciences, School of Life Sciences, University of Nottingham, Nottingham, UK
| | - Nigel Halliday
- National Biofilms Innovation Centre, Centre for Biomolecular Sciences, School of Life Sciences, University of Nottingham, Nottingham, UK
| | - Miguel Cámara
- National Biofilms Innovation Centre, Centre for Biomolecular Sciences, School of Life Sciences, University of Nottingham, Nottingham, UK
| | - Helen L Barr
- Wolfson Cystic Fibrosis Centre, Department of Respiratory Medicine, Nottingham University Hospitals NHS Trust, Nottingham, UK
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13
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Schwab M, Bergonzi C, Sakkos J, Staley C, Zhang Q, Sadowsky MJ, Aksan A, Elias M. Signal Disruption Leads to Changes in Bacterial Community Population. Front Microbiol 2019; 10:611. [PMID: 30984139 PMCID: PMC6449428 DOI: 10.3389/fmicb.2019.00611] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Accepted: 03/11/2019] [Indexed: 01/02/2023] Open
Abstract
The disruption of bacterial signaling (quorum quenching) has been proven to be an innovative approach to influence the behavior of bacteria. In particular, lactonase enzymes that are capable of hydrolyzing the N-acyl homoserine lactone (AHL) molecules used by numerous bacteria, were reported to inhibit biofilm formation, including those of freshwater microbial communities. However, insights and tools are currently lacking to characterize, understand and explain the effects of signal disruption on complex microbial communities. Here, we produced silica capsules containing an engineered lactonase that exhibits quorum quenching activity. Capsules were used to design a filtration cartridge to selectively degrade AHLs from a recirculating bioreactor. The growth of a complex microbial community in the bioreactor, in the presence or absence of lactonase, was monitored over a 3-week period. Dynamic population analysis revealed that signal disruption using a quorum quenching lactonase can effectively reduce biofilm formation in the recirculating bioreactor system and that biofilm inhibition is concomitant to drastic changes in the composition, diversity and abundance of soil bacterial communities within these biofilms. Effects of the quorum quenching lactonase on the suspension community also affected the microbial composition, suggesting that effects of signal disruption are not limited to biofilm populations. This unexpected finding is evidence for the importance of signaling in the competition between bacteria within communities. This study provides foundational tools and data for the investigation of the importance of AHL-based signaling in the context of complex microbial communities.
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Affiliation(s)
- Michael Schwab
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Twin Cities, St. Paul, MN, United States.,Biotechnology Institute, University of Minnesota, Twin Cities, St. Paul, MN, United States
| | - Celine Bergonzi
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Twin Cities, St. Paul, MN, United States.,Biotechnology Institute, University of Minnesota, Twin Cities, St. Paul, MN, United States
| | - Jonathan Sakkos
- Department of Mechanical Engineering, University of Minnesota, Twin Cities, St. Paul, MN, United States
| | - Christopher Staley
- Biotechnology Institute, University of Minnesota, Twin Cities, St. Paul, MN, United States.,Department of Surgery, University of Minnesota, Twin Cities, St. Paul, MN, United States
| | - Qian Zhang
- Biotechnology Institute, University of Minnesota, Twin Cities, St. Paul, MN, United States.,Department of Soil, Water, and Climate, University of Minnesota, Twin Cities, St. Paul, MN, United States
| | - Michael J Sadowsky
- Biotechnology Institute, University of Minnesota, Twin Cities, St. Paul, MN, United States.,Department of Soil, Water, and Climate, University of Minnesota, Twin Cities, St. Paul, MN, United States.,Department of Plant and Microbial Biology, University of Minnesota, Twin Cities, St. Paul, MN, United States
| | - Alptekin Aksan
- Biotechnology Institute, University of Minnesota, Twin Cities, St. Paul, MN, United States.,Department of Mechanical Engineering, University of Minnesota, Twin Cities, St. Paul, MN, United States
| | - Mikael Elias
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Twin Cities, St. Paul, MN, United States.,Biotechnology Institute, University of Minnesota, Twin Cities, St. Paul, MN, United States
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14
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The Quorum Sensing System of Yersinia enterocolitica 8081 Regulates Swimming Motility, Host Cell Attachment, and Virulence Plasmid Maintenance. Genes (Basel) 2018; 9:genes9060307. [PMID: 29925778 PMCID: PMC6027161 DOI: 10.3390/genes9060307] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Accepted: 06/12/2018] [Indexed: 11/16/2022] Open
Abstract
Although Yersinia enterocolitica genomes are highly heterogeneous, they contain a conserved N-acylhomoserine lactone-dependent (AHL) quorum sensing (QS) system consisting of the luxR and luxI orthologs yenR and yenI respectively. Certain hypervirulent strains also contain a putative orphan luxR gene, ycoR, that is not linked to an AHL synthase. To explore the contribution of yenR/yenI/ycoR to QS-dependent phenotypes in Yersinia enterocolitica strain 8081, single and multiple mutants were constructed. AHL profiling identified N-(3-oxohexanoyl) homoserine lactone, N-hexanoylhomoserine lactone, and N-(3-oxoseptanoyl) homoserine lactone as the most abundant. The AHL profiles of the yenR, ycoR and yenR/ycoR mutants were similar to the parent suggesting that the two LuxR homologues do not regulate AHL production while the yenI mutants were AHL-negative. A role for QS in swimming motility and cell attachment was demonstrated. Down-regulation of the virulence plasmid partition gene, spyA, in yenI and yenI/yenR/ycoR mutants is consistent with the greater loss of the Y. enterocolitica pYVe virulence plasmid in the yenI mutant during serial passage at 37 °C but not at 22 °C. A role for QS-regulated spyA in virulence plasmid maintenance is suggested.
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15
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Soler A, Arregui L, Arroyo M, Mendoza JA, Muras A, Álvarez C, García-Vera C, Marquina D, Santos A, Serrano S. Quorum Sensing versus Quenching Bacterial Isolates Obtained from MBR Plants Treating Leachates from Municipal Solid Waste. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2018; 15:E1019. [PMID: 29783658 PMCID: PMC5982058 DOI: 10.3390/ijerph15051019] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 05/12/2018] [Accepted: 05/15/2018] [Indexed: 12/12/2022]
Abstract
Quorum sensing (QS) is a mechanism dependent on bacterial density. This coordinated process is mediated by the synthesis and the secretion of signal molecules, called autoinducers (AIs). N-acyl-homoserine lactones (AHLs) are the most common AIs that are used by Gram-negative bacteria and are involved in biofilm formation. Quorum Quenching (QQ) is the interference of QS by producing hydrolyzing enzymes, among other strategies. The main objective of the present study was to identify QS and QQ strains from MBR wastewater treatment plants. A total of 99 strains were isolated from two Spanish plants that were intended to treat leachate from municipal solid waste. Five AHL producers were detected using AHL biosensor strains (Chromobacterium violaceum CV026 and Agrobacterium tumefaciens NT1). Fifteen strains of seventy-one Gram-positive were capable of eliminating or reducing at least one AHL activity. The analysis of 16S rRNA gene sequence showed the importance of the Pseudomonas genus in the production of biofilms and the relevance of the genus Bacillus in the disruption of the QS mechanism, in which the potential activity of lactonase or acylase enzymes was investigated with the aim to contribute to solve biofouling problems and to increase the useful lifespan of membranes.
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Affiliation(s)
- Albert Soler
- Department of Genetics, Physiology and Microbiology, Complutense University of Madrid, 28040 Madrid, Spain.
| | - Lucía Arregui
- Department of Genetics, Physiology and Microbiology, Complutense University of Madrid, 28040 Madrid, Spain.
| | - Miguel Arroyo
- Department of Biochemistry and Molecular Biology I, Complutense University of Madrid, 28040 Madrid, Spain.
| | - José Antonio Mendoza
- Department of Chemical and Nuclear Engineering, Polytechnic University of Valencia, 46022 Valencia, Spain.
| | - Andrea Muras
- Department of Microbiology and Parasitology-CIBUS, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain.
| | | | | | - Domingo Marquina
- Department of Genetics, Physiology and Microbiology, Complutense University of Madrid, 28040 Madrid, Spain.
| | - Antonio Santos
- Department of Genetics, Physiology and Microbiology, Complutense University of Madrid, 28040 Madrid, Spain.
| | - Susana Serrano
- Department of Genetics, Physiology and Microbiology, Complutense University of Madrid, 28040 Madrid, Spain.
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16
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Yang Y, Zhou M, Hardwidge PR, Cui H, Zhu G. Isolation and Characterization of N-acyl Homoserine Lactone-Producing Bacteria From Cattle Rumen and Swine Intestines. Front Cell Infect Microbiol 2018; 8:155. [PMID: 29868511 PMCID: PMC5954215 DOI: 10.3389/fcimb.2018.00155] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Accepted: 04/24/2018] [Indexed: 11/15/2022] Open
Abstract
Quorum sensing systems regulate gene expression in response to bacterial population density. Acyl-homoserine lactones are a class of quorum sensing molecules found in cattle rumen that are thought to regulate the gene expression of enterohemorrhagic Escherichia coli and thus help this pathogen survive in animal gastrointestinal tracts. However, the specific bacteria that produce these signaling molecules in bovine and porcine gastrointestinal tracts are unknown. Here we developed methods to concentrate gastrointestinal fluids and screen the bacteria that produce acyl-homoserine lactones. We isolated a Pseudomonas aeruginosa strain YZ1 from cattle rumen, and an Aeromonas hydrophila strain YZ2 from pig intestine. Mass spectrometry analysis of culture supernatants indicated at least three specific classes of acyl-homoserine lactones produced by YZ1, and a C4-acyl-homoserine lactone produced by YZ2. Transformation of E. coli with P. aeruginosa or A. hydrophila luxI homologs,which can produce short- or long-chain acyl-homoserine lactones conferred upon E. coli the ability to synthesize acyl-homoserine lactones and affected gene expression, motility, and acid tolerance of E. coli. This is the first study reporting the isolation and characterization of acyl-homoserine lactone synthase-positive bacteria from cattle rumen and swine intestines.
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Affiliation(s)
- Yang Yang
- Institute of Epigenetics and Epigenomics and College of Animal Science and Technology, Yangzhou University, Yangzhou, China.,Jiangsu Co-Innovation Center for Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, China.,College of Veterinary Medicine, Yangzhou University, Yangzhou, China
| | - Mingxu Zhou
- Jiangsu Co-Innovation Center for Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, China.,College of Veterinary Medicine, Yangzhou University, Yangzhou, China
| | - Philip R Hardwidge
- College of Veterinary Medicine, Kansas State University, Manhattan, KS, United States
| | - Hengmi Cui
- Institute of Epigenetics and Epigenomics and College of Animal Science and Technology, Yangzhou University, Yangzhou, China
| | - Guoqiang Zhu
- Jiangsu Co-Innovation Center for Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, China.,College of Veterinary Medicine, Yangzhou University, Yangzhou, China
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17
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Bruns H, Herrmann J, Müller R, Wang H, Wagner Döbler I, Schulz S. Oxygenated N-Acyl Alanine Methyl Esters (NAMEs) from the Marine Bacterium Roseovarius tolerans EL-164. JOURNAL OF NATURAL PRODUCTS 2018; 81:131-139. [PMID: 29261310 DOI: 10.1021/acs.jnatprod.7b00757] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The marine bacterium Roseovarius tolerans EL-164 (Rhodobacteraceae) can produce unique N-acylalanine methyl esters (NAMEs) besides strucutrally related N-acylhomoserine lactones (AHLs), bacterial signaling compounds widespread in the Rhodobacteraceae. The structures of two unprecedented NAMEs carrying a rare terminally oxidized acyl chain are reported here. The compounds (Z)-N-16-hydroxyhexadec-9-enoyl-l-alanine methyl ester (Z9-16-OH-C16:1-NAME, 3) and (Z)-N-15-carboxypentadec-9-enoyl-l-alanine methyl ester (16COOH-C16:1-NAME, 4) were isolated, and the structures were determined by NMR and MS experiments. Both compounds were synthesized to prove assignments and to test their biological activity. Finally, non-natural, structurally related Z9-3-OH-C16:1-NAME (18) was synthesized to investigate the mass spectroscopy of structurally related NAMEs. Compound 3 showed moderate antibacterial activity against microorganisms such as Bacillus, Streptococcus, Micrococcus, or Mucor strains. In contrast to AHLs, quorum-sensing or quorum-quenching activity was not observed.
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Affiliation(s)
- Hilke Bruns
- Institute of Organic Chemistry, Technische Universität Braunschweig , Hagenring 30, 38106 Braunschweig, Germany
| | - Jennifer Herrmann
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Center for Infection Research (HZI), Saarland University , Campus E8.1, 66123 Saarbrücken, Germany
| | - Rolf Müller
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Center for Infection Research (HZI), Saarland University , Campus E8.1, 66123 Saarbrücken, Germany
| | - Hui Wang
- Helmholtz Centre for Infection Research , Inhoffenstraße 7, 38124 Braunschweig, Germany
| | - Irene Wagner Döbler
- Helmholtz Centre for Infection Research , Inhoffenstraße 7, 38124 Braunschweig, Germany
| | - Stefan Schulz
- Institute of Organic Chemistry, Technische Universität Braunschweig , Hagenring 30, 38106 Braunschweig, Germany
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18
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Ma JC, Wu YQ, Cao D, Zhang WB, Wang HH. Only Acyl Carrier Protein 1 (AcpP1) Functions in Pseudomonas aeruginosa Fatty Acid Synthesis. Front Microbiol 2017; 8:2186. [PMID: 29176964 PMCID: PMC5686131 DOI: 10.3389/fmicb.2017.02186] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Accepted: 10/25/2017] [Indexed: 11/21/2022] Open
Abstract
The genome of Pseudomonas aeruginosa contains three open reading frames, PA2966, PA1869, and PA3334, which encode putative acyl carrier proteins, AcpP1, AcpP2, and AcpP3, respectively. In this study, we found that, although these apo-ACPs were successfully phosphopantetheinylated by P. aeruginosa phosphopantetheinyl transferase (PcpS) and all holo-forms of these proteins could be acylated by Vibrio harveyi acyl-ACP synthetase (AasS), only AcpP1 could be used as a substrate for the synthesis of fatty acids, catalyzed by P. aeruginosa cell free extracts in vitro, and only acpP1 gene could restore growth in the Escherichia coliacpP mutant strain CY1877. And P. aeruginosaacpP1 could not be deleted, while disruption of acpP2 or acpP3 in the P. aeruginosa genome allowed mutant strains to grow as well as the wild type strain. These findings confirmed that only P. aeruginosa AcpP1 functions in fatty acid biosynthesis, and that acpP2 and acpP3 do not play roles in the fatty acid synthetic pathway. Moreover, disruption of acpP2 and acpP3 did not affect the ability of P. aeruginosa to produce N-acylhomoserine lactones (AHL), but replacement of P. aeruginosaacpP1 with E. coliacpP caused P. aeruginosa to reduce the production of AHL molecules, which indicated that neither P. aeruginosa AcpP2 nor AcpP3 can act as a substrate for synthesis of AHL molecules in vivo. Furthermore, replacement of acpP1 with E. coliacpP reduced the ability of P. aeruginosa to produce some exo-products and abolished swarming motility in P. aeruginosa.
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Affiliation(s)
- Jin-Cheng Ma
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Guangzhou, China
| | - Yun-Qi Wu
- Department of Chemistry and Biomolecular Sciences, Macquarie University, North Ryde, NSW, Australia
| | - Dan Cao
- Forensic Science Center of Qingyuan, Qingyuan Public Security Department, Qingyuan, China
| | - Wen-Bin Zhang
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Guangzhou, China
| | - Hai-Hong Wang
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Guangzhou, China
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19
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Dou Y, Song F, Guo F, Zhou Z, Zhu C, Xiang J, Huan J. Acinetobacter baumannii quorum-sensing signalling molecule induces the expression of drug-resistance genes. Mol Med Rep 2017; 15:4061-4068. [PMID: 28487993 PMCID: PMC5436197 DOI: 10.3892/mmr.2017.6528] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Accepted: 03/13/2017] [Indexed: 01/23/2023] Open
Abstract
Quorum-sensing signalling molecules such as N-acyl homoserine lactones (AHLs) enable certain Gram-negative bacteria to respond to environmental changes through behaviours, such as biofilm formation and flagellar movement. The present study aimed to identify Acinetobacter baumannii AHLs and assess their influence on antibiotic resistance. A clinical isolate of A. baumannii strain S (AbS) was collected from the wound of a burn patient and high-performance liquid chromatography and tandem quadrupole or quadrupole time-of-flight high-resolution mass spectrometry was used to identify AbS AHLs. Antibiotic sensitivity was assessed in an AHL-deficient AbS mutant (AbS-M), and the expression of drug-resistance genes in the presence of meropenem in AbS, AbS-M and AbS-M treated with the AHL N-3-hydroxy-dodecanoyl-homoserine lactone (N-3-OH-C12-HSL). AbS-M was more sensitive to meropenem and piperacillin than wild-type AbS, but resistance was restored by supplementation with N-3-OH-C12-HSL. In addition, meropenem-treated AbS-M expressed lower levels of the drug-resistance genes oxacillinase 51, AmpC, AdeA and AdeB; treatment with N-3-OH-C12-HSL also restored the expression of these genes. Overall, the results of the present study indicate that N-3-OH-C12-HSL may be involved in regulating the expression of drug-resistance genes in A. baumannii. Therefore, this quorum-sensing signalling molecule may be an important target for treating multidrug-resistant A. baumannii infections.
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Affiliation(s)
- Yi Dou
- Department of Burns and Plastic Surgery, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, P.R. China
| | - Fei Song
- Department of Burns and Plastic Surgery, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, P.R. China
| | - Feng Guo
- Department of Burns and Plastic Surgery, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, P.R. China
| | - Zengding Zhou
- Department of Burns and Plastic Surgery, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, P.R. China
| | - Cailian Zhu
- The Ninth People's Hospital, School of Stomatology, Shanghai Jiaotong University, Shanghai Research Institute of Stomatology, Shanghai 200011, P.R. China
| | - Jun Xiang
- Department of Burns and Plastic Surgery, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, P.R. China
| | - Jingning Huan
- Department of Burns and Plastic Surgery, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, P.R. China
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20
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Torres M, Uroz S, Salto R, Fauchery L, Quesada E, Llamas I. HqiA, a novel quorum-quenching enzyme which expands the AHL lactonase family. Sci Rep 2017; 7:943. [PMID: 28424524 PMCID: PMC5430456 DOI: 10.1038/s41598-017-01176-7] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Accepted: 03/22/2017] [Indexed: 11/09/2022] Open
Abstract
The screening of a metagenomic library of 250,000 clones generated from a hypersaline soil (Spain) allowed us to identify a single positive clone which confers the ability to degrade N-acyl homoserine lactones (AHLs). The sequencing of the fosmid revealed a 42,318 bp environmental insert characterized by 46 ORFs. The subcloning of these ORFs demonstrated that a single gene (hqiA) allowed AHL degradation. Enzymatic analysis using purified HqiA and HPLC/MS revealed that this protein has lactonase activity on a broad range of AHLs. The introduction of hqiA in the plant pathogen Pectobacterium carotovorum efficiently interfered with both the synthesis of AHLs and quorum-sensing regulated functions, such as swarming motility and the production of maceration enzymes. Bioinformatic analyses highlighted that HqiA showed no sequence homology with the known prototypic AHL lactonases or acylases, thus expanding the AHL-degrading enzymes with a new family related to the cysteine hydrolase (CHase) group. The complete sequence analysis of the fosmid showed that 31 ORFs out of the 46 identified were related to Deltaproteobacteria, whilst many intercalated ORFs presented high homology with other taxa. In this sense, hqiA appeared to be assigned to the Hyphomonas genus (Alphaproteobacteria), suggesting that horizontal gene transfer had occurred.
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Affiliation(s)
- Marta Torres
- Department of Microbiology, Faculty of Pharmacy, University of Granada, Granada, Spain.,Institute of Biotechnology, Biomedical Research Center (CIBM), University of Granada, Granada, Spain
| | - Stéphane Uroz
- UMR 1136 INRA-Université de Lorraine Interactions Arbres-Microorganismes, Centre INRA de Nancy, Champenoux, France
| | - Rafael Salto
- Department of Biochemistry and Molecular Biology II, Faculty of Pharmacy, University of Granada, Granada, Spain
| | - Laure Fauchery
- UMR 1136 INRA-Université de Lorraine Interactions Arbres-Microorganismes, Centre INRA de Nancy, Champenoux, France
| | - Emilia Quesada
- Department of Microbiology, Faculty of Pharmacy, University of Granada, Granada, Spain.,Institute of Biotechnology, Biomedical Research Center (CIBM), University of Granada, Granada, Spain
| | - Inmaculada Llamas
- Department of Microbiology, Faculty of Pharmacy, University of Granada, Granada, Spain. .,Institute of Biotechnology, Biomedical Research Center (CIBM), University of Granada, Granada, Spain.
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21
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Tan KH, How KY, Tan JY, Yin WF, Chan KG. Cloning and Characterization of the Autoinducer Synthase Gene from Lipid-Degrading Bacterium Cedecea neteri. Front Microbiol 2017; 8:72. [PMID: 28197135 PMCID: PMC5281573 DOI: 10.3389/fmicb.2017.00072] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Accepted: 01/11/2017] [Indexed: 11/13/2022] Open
Abstract
The process of intercellular communication among bacteria, termed quorum sensing (QS), is mediated by small diffusible molecules known as the autoinducers. QS allows the population to react to the change of cell density in unison, in processes such as biofilm formation, plasmid conjugation, virulence, motility and root nodulation. In Gram-negative proteobacteria, N-acyl homoserine lactone (AHL) is the common "language" to coordinate gene expression. This signaling molecule is usually synthesized by LuxI-type proteins. We have previously discovered that a rare bacterium, Cedecea neteri, exhibits AHL-type QS activity. With information generated from genome sequencing, we have identified the luxIR gene pair responsible for AHL-type QS and named it cneIR. In this study, we have cloned and expressed the 636 bp luxI homolog in an Escherichia coli host for further characterization. Our findings show that E. coli harboring cneI produced the same AHL profile as the wild type C. neteri, with the synthesis of AHL known as N-butyryl-homoserine lactone. This 25 kDa LuxI homolog shares high similarity with other AHL synthases from closely related species. This work is the first documentation of molecular cloning and characterization of luxI homolog from C. neteri.
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Affiliation(s)
- Kian-Hin Tan
- Division of Genetic and Molecular Biology, Institute of Biological Sciences, Faculty of Science, University of Malaya Kuala Lumpur, Malaysia
| | - Kah-Yan How
- Division of Genetic and Molecular Biology, Institute of Biological Sciences, Faculty of Science, University of Malaya Kuala Lumpur, Malaysia
| | - Jia-Yi Tan
- Division of Genetic and Molecular Biology, Institute of Biological Sciences, Faculty of Science, University of Malaya Kuala Lumpur, Malaysia
| | - Wai-Fong Yin
- Division of Genetic and Molecular Biology, Institute of Biological Sciences, Faculty of Science, University of Malaya Kuala Lumpur, Malaysia
| | - Kok-Gan Chan
- Division of Genetic and Molecular Biology, Institute of Biological Sciences, Faculty of Science, University of Malaya Kuala Lumpur, Malaysia
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Huang YH, Lin JS, Ma JC, Wang HH. Functional Characterization of Triclosan-Resistant Enoyl-acyl-carrier Protein Reductase (FabV) in Pseudomonas aeruginosa. Front Microbiol 2016; 7:1903. [PMID: 27965638 PMCID: PMC5126088 DOI: 10.3389/fmicb.2016.01903] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Accepted: 11/14/2016] [Indexed: 12/16/2022] Open
Abstract
Pseudomonas aeruginosa is extremely resistant to triclosan. Previous studies have shown that P. aeruginosa encodes a triclosan-resistant enoyl-acyl-carrier protein reductase (ENR), FabV, and that deletion of fabV causes P. aeruginosa to be extremely sensitive to triclosan. In this report, we complemented a P. aeruginosa fabV deletion strain with several triclosan-resistant ENR encoding genes, including Vibrio cholerae fabV, Bacillus subtilis fabL and Enterococcus faecalis fabK. All complemented strains restored triclosan resistance to the level of the wild-type strain, which confirmed that triclosan-resistant ENR allows P. aeruginosa to be extremely resistant to triclosan. Moreover, fabV exhibits pleiotropic effects. Deletion of fabV led P. aeruginosa to show attenuated swarming motility, decreased rhamnolipid, pyoverdine and acyl-homoserine lactones (AHLs) production. Complementation of the fabV mutant with any one ENR encoding gene could restore these features to some extent, in comparison with the wild-type strain. Furthermore, we found that addition of exogenous AHLs could restore the fabV mutant strain to swarm on semisolid plates and to produce more virulence factors than the fabV mutant strain. These findings indicate that deletion of fabV reduced the activity of ENR in P. aeruginosa, decreased fatty acid synthesis, and subsequently depressed the production of AHLs and other virulence factors, which finally may led to a reduction in the pathogenicity of P. aeruginosa. Therefore, fabV should be an ideal target for the control of P. aeruginosa infectivity.
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Affiliation(s)
- Yong-Heng Huang
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University Guangzhou, China
| | - Jin-Shui Lin
- Shaanxi Engineering and Technological Research Center for Conversation and Utilization of Regional Biological Resources, College of Life Sciences, Yan'an University Yan'an, China
| | - Jin-Cheng Ma
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University Guangzhou, China
| | - Hai-Hong Wang
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University Guangzhou, China
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23
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Barr HL, Halliday N, Barrett DA, Williams P, Forrester DL, Peckham D, Williams K, Smyth AR, Honeybourne D, L Whitehouse J, Nash EF, Dewar J, Clayton A, Knox AJ, Cámara M, Fogarty AW. Diagnostic and prognostic significance of systemic alkyl quinolones for P. aeruginosa in cystic fibrosis: A longitudinal study. J Cyst Fibros 2016; 16:230-238. [PMID: 27773591 PMCID: PMC5345566 DOI: 10.1016/j.jcf.2016.10.005] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Revised: 10/02/2016] [Accepted: 10/06/2016] [Indexed: 11/30/2022]
Abstract
Background Pulmonary P. aeruginosa infection is associated with poor outcomes in cystic fibrosis (CF) and early diagnosis is challenging, particularly in those who are unable to expectorate sputum. Specific P. aeruginosa 2-alkyl-4-quinolones are detectable in the sputum, plasma and urine of adults with CF, suggesting that they have potential as biomarkers for P. aeruginosa infection. Aim To investigate systemic 2-alkyl-4-quinolones as potential biomarkers for pulmonary P. aeruginosa infection. Methods A multicentre observational study of 176 adults and 68 children with CF. Cross-sectionally, comparisons were made between current P. aeruginosa infection using six 2-alkyl-4-quinolones detected in sputum, plasma and urine against hospital microbiological culture results. All participants without P. aeruginosa infection at baseline were followed up for one year to determine if 2-alkyl-4-quinolones were early biomarkers of pulmonary P. aeruginosa infection. Results Cross-sectional analysis: the most promising biomarker with the greatest diagnostic accuracy was 2-heptyl-4-hydroxyquinoline (HHQ). In adults, areas under the ROC curves (95% confidence intervals) for HHQ analyses were 0.82 (0.75–0.89) in sputum, 0.76 (0.69–0.82) in plasma and 0.82 (0.77–0.88) in urine. In children, the corresponding values for HHQ analyses were 0.88 (0.77–0.99) in plasma and 0.83 (0.68–0.97) in urine. Longitudinal analysis: Ten adults and six children had a new positive respiratory culture for P. aeruginosa in follow-up. A positive plasma HHQ test at baseline was significantly associated with a new positive culture for P. aeruginosa in both adults and children in follow-up (odds ratio (OR) = 6.67;-95% CI:-1.48–30.1;-p = 0.01 and OR = 70; 95% CI: 5–956;-p < 0.001 respectively). Conclusions AQs measured in sputum, plasma and urine may be used to diagnose current infection with P. aeruginosa in adults and children with CF. These preliminary data show that plasma HHQ may have potential as an early biomarker of pulmonary P. aeruginosa. Further studies are necessary to evaluate if HHQ could be used in clinical practice to aid early diagnosis of P. aeruginosa infection in the future.
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Affiliation(s)
- Helen L Barr
- Division of Respiratory Medicine, University of Nottingham, City Hospital Campus, Nottingham, UK.
| | - Nigel Halliday
- School of Life Sciences, Centre for Biomolecular Sciences, University of Nottingham, Nottingham, UK
| | - David A Barrett
- Centre for Analytical Bioscience, School of Pharmacy, University of Nottingham, Nottingham, UK
| | - Paul Williams
- School of Life Sciences, Centre for Biomolecular Sciences, University of Nottingham, Nottingham, UK
| | - Douglas L Forrester
- Division of Respiratory Medicine, University of Nottingham, City Hospital Campus, Nottingham, UK
| | - Daniel Peckham
- Leeds Adult Cystic Fibrosis Centre, St James's University Hospital, Leeds, UK
| | - Kate Williams
- Leeds Adult Cystic Fibrosis Centre, St James's University Hospital, Leeds, UK
| | - Alan R Smyth
- Division of Child Health, Obstetrics and Gynaecology, University of Nottingham, UK
| | - David Honeybourne
- West Midlands Adult CF Centre, Heart of England, NHS Foundation Trust, Birmingham, UK
| | - Joanna L Whitehouse
- West Midlands Adult CF Centre, Heart of England, NHS Foundation Trust, Birmingham, UK
| | - Edward F Nash
- West Midlands Adult CF Centre, Heart of England, NHS Foundation Trust, Birmingham, UK
| | - Jane Dewar
- Wolfson Cystic Fibrosis Centre, Department of Respiratory Medicine, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - Andrew Clayton
- Wolfson Cystic Fibrosis Centre, Department of Respiratory Medicine, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - Alan J Knox
- Division of Respiratory Medicine, University of Nottingham, City Hospital Campus, Nottingham, UK
| | - Miguel Cámara
- School of Life Sciences, Centre for Biomolecular Sciences, University of Nottingham, Nottingham, UK
| | - Andrew W Fogarty
- Division of Epidemiology and Public Health, University of Nottingham, Clinical Sciences Building, University of Nottingham, Nottingham, UK
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24
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Patel NM, Moore JD, Blackwell HE, Amador-Noguez D. Identification of Unanticipated and Novel N-Acyl L-Homoserine Lactones (AHLs) Using a Sensitive Non-Targeted LC-MS/MS Method. PLoS One 2016; 11:e0163469. [PMID: 27706219 PMCID: PMC5051804 DOI: 10.1371/journal.pone.0163469] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2016] [Accepted: 09/10/2016] [Indexed: 12/31/2022] Open
Abstract
N-acyl L-homoserine lactones (AHLs) constitute a predominant class of quorum-sensing signaling molecules used by Gram-negative bacteria. Here, we report a sensitive and non-targeted HPLC-MS/MS method based on parallel reaction monitoring (PRM) to identify and quantitate known, unanticipated, and novel AHLs in microbial samples. Using a hybrid quadrupole-high resolution mass analyzer, this method integrates MS scans and all-ion fragmentation MS/MS scans to allow simultaneous detection of AHL parent-ion masses and generation of full mass spectra at high resolution and high mass accuracy in a single chromatographic run. We applied this method to screen for AHL production in a variety of Gram-negative bacteria (i.e. B. cepacia, E. tarda, E. carotovora, E. herbicola, P. stewartii, P. aeruginosa, P. aureofaciens, and R. sphaeroides) and discovered that nearly all of them produce a larger set of AHLs than previously reported. Furthermore, we identified production of an uncommon AHL (i.e. 3-oxo-C7-HL) in E. carotovora and P. stewartii, whose production has only been previously observed within the genera Serratia and Yersinia. Finally, we used our method to quantitate AHL degradation in B. cepacia, E. carotovora, E. herbicola, P. stewartii, P. aeruginosa, P. aureofaciens, the non-AHL producer E. coli, and the Gram-positive bacterium B. subtilis. We found that AHL degradation ability varies widely across these microbes, of which B. subtilis and E. carotovora are the best degraders, and observed that there is a general trend for AHLs containing long acyl chains (≥10 carbons) to be degraded at faster rates than AHLs with short acyl chains (≤6 carbons).
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Affiliation(s)
- Nishaben M. Patel
- Department of Bacteriology, 1550 Linden Dr., University of Wisconsin-Madison, Madison, Wisconsin, United States of America
- Master of Science in Bacteriology Program, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
| | - Joseph D. Moore
- Department of Chemistry, 1101 University Ave., University of Wisconsin-Madison, Madison, Wisconsin, United States of America
| | - Helen E. Blackwell
- Department of Chemistry, 1101 University Ave., University of Wisconsin-Madison, Madison, Wisconsin, United States of America
| | - Daniel Amador-Noguez
- Department of Bacteriology, 1550 Linden Dr., University of Wisconsin-Madison, Madison, Wisconsin, United States of America
- * E-mail:
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25
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Detection of N-Acyl-homoserine Lactones Signal Molecules of Quorum Sensing Secreted by Denitrification Flora in Microaerobic Nitrogen Removal Processes by Ultra-performance Liquid Chromatography Tandem Mass Spectrometry. CHINESE JOURNAL OF ANALYTICAL CHEMISTRY 2016. [DOI: 10.1016/s1872-2040(16)60948-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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26
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Ruysbergh E, Stevens CV, De Kimpe N, Mangelinckx S. Synthesis and analysis of stable isotope-labelled N-acyl homoserine lactones. RSC Adv 2016. [DOI: 10.1039/c6ra17797b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An easy, reliable manner to make suitable, deuterated standards of AHL-molecules belonging to all three important classes of AHLs is presented, starting from a cheap and commercially available deuterium source.
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Affiliation(s)
- Ewout Ruysbergh
- Department of Sustainable Organic Chemistry and Technology
- Faculty of Bioscience Engineering
- Ghent University
- B-9000 Ghent
- Belgium
| | - Christian V. Stevens
- Department of Sustainable Organic Chemistry and Technology
- Faculty of Bioscience Engineering
- Ghent University
- B-9000 Ghent
- Belgium
| | - Norbert De Kimpe
- Department of Sustainable Organic Chemistry and Technology
- Faculty of Bioscience Engineering
- Ghent University
- B-9000 Ghent
- Belgium
| | - Sven Mangelinckx
- Department of Sustainable Organic Chemistry and Technology
- Faculty of Bioscience Engineering
- Ghent University
- B-9000 Ghent
- Belgium
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27
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Charlesworth J, Kimyon O, Manefield M, Burns BP. Detection and characterization of N-acyl-l-homoserine lactones using GFP-based biosensors in conjunction with thin-layer chromatography. J Microbiol Methods 2015; 118:164-7. [PMID: 26407505 DOI: 10.1016/j.mimet.2015.09.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Revised: 09/21/2015] [Accepted: 09/21/2015] [Indexed: 10/23/2022]
Abstract
Many microorganisms use quorum sensing to regulate several complex phenotypes, and this is accomplished by the release of a signal molecule(s) into the environment. N-acyl-homoserine lactones (AHLs) are a common class of signalling molecule utilized by a range of microorganisms (primarily Gram negative bacteria but most recently also archaea) and are often detected through the use of bacterial biosensors. Biosensors can be limited by both their specificity and sensitivity, and the aim of this study was to modify and improve current AHL detection strategies. The biosensor employed in the present study was Escherichia coli MT102 harbouring a plasmid containing a LuxR based biosensor, which produces green fluorescent protein (GFP) as a reporting mechanism. A new method of visualizing the GFP based biosensor overlaid on silica sheets for the purpose of thin-layer chromatography (TLC) is presented. This new method vastly improves sensitivity of AHL detection by a GFP biosensor than previously reported and as such represents a powerful new tool in AHL research.
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Affiliation(s)
- James Charlesworth
- School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, Australia; Australian Centre for Astrobiology, University of New South Wales Sydney, Australia
| | - Onder Kimyon
- School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, Australia
| | - Michael Manefield
- School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, Australia
| | - Brendan P Burns
- School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, Australia; Australian Centre for Astrobiology, University of New South Wales Sydney, Australia.
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Abstract
A wide variety of organisms communicate via the chemical channel using small molecules. A structural feature quite often found is the lactone motif. In the present paper, the current knowledge on such lactones will be described, concentrating on the structure, chemistry, function, biosynthesis and synthesis of these compounds. Lactone semiochemicals from insects, vertebrates and bacteria, which this article will focus on, are particularly well investigated. In addition, some ideas on the advantageous use of lactones as volatile signals, which promoted their evolutionary development, will be discussed.
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Affiliation(s)
- Stefan Schulz
- Institute of Organic Chemistry, Technische Universität Braunschweig, 38106 Braunschweig, Germany.
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29
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Barr HL, Halliday N, Cámara M, Barrett DA, Williams P, Forrester DL, Simms R, Smyth AR, Honeybourne D, Whitehouse JL, Nash EF, Dewar J, Clayton A, Knox AJ, Fogarty AW. Pseudomonas aeruginosa quorum sensing molecules correlate with clinical status in cystic fibrosis. Eur Respir J 2015; 46:1046-54. [PMID: 26022946 PMCID: PMC4589431 DOI: 10.1183/09031936.00225214] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Accepted: 04/08/2015] [Indexed: 01/25/2023]
Abstract
Pseudomonas aeruginosa produces quorum sensing signal molecules that are potential biomarkers for infection. A prospective study of 60 cystic fibrosis patients with chronic P. aeruginosa, who required intravenous antibiotics for pulmonary exacerbations, was undertaken. Clinical measurements and biological samples were obtained at the start and end of the treatment period. Additional data were available for 29 of these patients when they were clinically stable. Cross-sectionally, quorum sensing signal molecules were detectable in the sputum, plasma and urine of 86%, 75% and 83% patients, respectively. They were positively correlated between the three biofluids. Positive correlations were observed for most quorum sensing signal molecules in sputum, plasma and urine, with quantitative measures of pulmonary P. aeruginosa load at the start of a pulmonary exacerbation. Plasma concentrations of 2-nonyl-4-hydroxy-quinoline (NHQ) were significantly higher at the start of a pulmonary exacerbation compared to clinical stability (p<0.01). Following the administration of systemic antibiotics, plasma 2-heptyl-4-hydroxyquinoline (p=0.02) and NHQ concentrations (p<0.01) decreased significantly. In conclusion, quorum sensing signal molecules are detectable in cystic fibrosis patients with pulmonary P. aeruginosa infection and are positively correlated with quantitative measures of P. aeruginosa. NHQ correlates with clinical status and has potential as a novel biomarker for P. aeruginosa infection. P. aeruginosa QS molecules correlate with clinical status in cystic fibrosis and are biomarkers for infectionhttp://ow.ly/MhzZp
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Affiliation(s)
- Helen L Barr
- Division of Respiratory Medicine, Clinical Sciences Building, University of Nottingham, City Hospital Campus, Nottingham, UK
| | - Nigel Halliday
- School of Life Sciences, Centre for Biomolecular Sciences, University of Nottingham, Nottingham, UK
| | - Miguel Cámara
- School of Life Sciences, Centre for Biomolecular Sciences, University of Nottingham, Nottingham, UK
| | - David A Barrett
- Centre for Analytical Bioscience, School of Pharmacy, University of Nottingham, Nottingham, UK
| | - Paul Williams
- School of Life Sciences, Centre for Biomolecular Sciences, University of Nottingham, Nottingham, UK
| | - Douglas L Forrester
- Division of Respiratory Medicine, Clinical Sciences Building, University of Nottingham, City Hospital Campus, Nottingham, UK
| | - Rebecca Simms
- Division of Respiratory Medicine, Clinical Sciences Building, University of Nottingham, City Hospital Campus, Nottingham, UK
| | - Alan R Smyth
- Division of Child Health, Obstetrics and Gynaecology, University of Nottingham, University Hospital, Nottingham, UK
| | - David Honeybourne
- West Midlands Adult CF Centre, Heart of England NHS Foundation Trust, Birmingham, UK
| | - Joanna L Whitehouse
- West Midlands Adult CF Centre, Heart of England NHS Foundation Trust, Birmingham, UK
| | - Edward F Nash
- West Midlands Adult CF Centre, Heart of England NHS Foundation Trust, Birmingham, UK
| | - Jane Dewar
- Dept of Respiratory Medicine, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - Andrew Clayton
- Dept of Respiratory Medicine, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - Alan J Knox
- Division of Respiratory Medicine, Clinical Sciences Building, University of Nottingham, City Hospital Campus, Nottingham, UK
| | - Andrew W Fogarty
- Divison of Epidemiology and Public Health, Clinical Sciences Building, University of Nottingham, Nottingham, UK
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30
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Wang R, Chua KL, Neoh KG. Bifunctional Coating with Sustained Release of 4-Amide-piperidine-C12 for Long-Term Prevention of Bacterial Colonization on Silicone. ACS Biomater Sci Eng 2015; 1:405-415. [DOI: 10.1021/acsbiomaterials.5b00031] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Rong Wang
- Department
of Chemical and Biomolecular Engineering, 4 Engineering Drive 4, National University of Singapore, Kent Ridge, Singapore 117576
| | - Kim Lee Chua
- Department
of Biochemistry, 5 Science
Drive 2, National University of Singapore, Kent Ridge, Singapore 117545
| | - Koon Gee Neoh
- Department
of Chemical and Biomolecular Engineering, 4 Engineering Drive 4, National University of Singapore, Kent Ridge, Singapore 117576
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Hansen H, Purohit AA, Leiros HKS, Johansen JA, Kellermann SJ, Bjelland AM, Willassen NP. The autoinducer synthases LuxI and AinS are responsible for temperature-dependent AHL production in the fish pathogen Aliivibrio salmonicida. BMC Microbiol 2015; 15:69. [PMID: 25886758 PMCID: PMC4377199 DOI: 10.1186/s12866-015-0402-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Accepted: 03/11/2015] [Indexed: 11/25/2022] Open
Abstract
Background Quorum sensing (QS) is a cell-to-cell communication system used by bacteria to regulate activities such as virulence, bioluminescence and biofilm formation. The most common QS signals in Gram-negative bacteria are N-acyl-homoserine lactones (AHLs). Aliivibrio salmonicida is the etiological agent of cold water vibriosis in Atlantic salmon, a disease which occurs mainly during seasons when the seawater is below 12°C. In this work we have constructed several mutants of A. salmonicida LFI1238 in order to study the LuxI/LuxR and AinS/AinR QS systems with respect to AHL production and biofilm formation. Results Using high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) we found that LuxI in A. salmonicida LFI1238 is responsible for producing seven of the different AHLs, whereas AinS is responsible for producing only one. The production of these various AHLs is dependent on both cell density and growth temperature. The AHLs were efficiently produced when wild type LFI1238 was grown at 6 or 12°C, however at 16°C AHL production decreased dramatically, and LFI1238 produced less than 5% of the maximum concentrations observed at 6°C. LitR, the master regulator of QS, was found to be a positive regulator of AinS-dependent AHL production, and to a lesser extent LuxI-dependent AHL production. This implies a connection between the two systems, and both systems were found to be involved in regulation of biofilm formation. Finally, inactivation of either luxR1 or luxR2 in the lux operon significantly reduced production of LuxI-produced AHLs. Conclusion LuxI and AinS are the autoinducer synthases responsible for the eight AHLs in A. salmonicida. AHL production is highly dependent on growth temperature, and a significant decrease was observed when the bacterium was grown at a temperature above its limit for disease outbreak. Numerous AHLs could offer the opportunity for fine-tuning responses to changes in the environment. Electronic supplementary material The online version of this article (doi:10.1186/s12866-015-0402-z) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Hilde Hansen
- Norwegian Structural Biology Centre and the Department of Chemistry, Faculty of Science and Technology, UiT The Arctic University of Norway, N-9037, Tromsø, Norway.
| | - Amit Anand Purohit
- Norwegian Structural Biology Centre and the Department of Chemistry, Faculty of Science and Technology, UiT The Arctic University of Norway, N-9037, Tromsø, Norway.
| | - Hanna-Kirsti S Leiros
- Norwegian Structural Biology Centre and the Department of Chemistry, Faculty of Science and Technology, UiT The Arctic University of Norway, N-9037, Tromsø, Norway.
| | - Jostein A Johansen
- Norwegian Structural Biology Centre and the Department of Chemistry, Faculty of Science and Technology, UiT The Arctic University of Norway, N-9037, Tromsø, Norway.
| | - Stefanie J Kellermann
- Norwegian Structural Biology Centre and the Department of Chemistry, Faculty of Science and Technology, UiT The Arctic University of Norway, N-9037, Tromsø, Norway. .,Current address: Department of Chemistry and Pharmacy, Institute of Biochemistry, University of Münster, Wilhelm-Klemm-Straße 2, 48149, Münster, Germany.
| | - Ane Mohn Bjelland
- Section for Microbiology, Immunology and Parasitology, Department of Food Safety and Infection Biology, Faculty of Veterinary Medicine and Biosciences, Norwegian University of Life Sciences, Akershus, Norway.
| | - Nils Peder Willassen
- Norwegian Structural Biology Centre and the Department of Chemistry, Faculty of Science and Technology, UiT The Arctic University of Norway, N-9037, Tromsø, Norway.
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Darch SE, McNally A, Harrison F, Corander J, Barr HL, Paszkiewicz K, Holden S, Fogarty A, Crusz SA, Diggle SP. Recombination is a key driver of genomic and phenotypic diversity in a Pseudomonas aeruginosa population during cystic fibrosis infection. Sci Rep 2015; 5:7649. [PMID: 25578031 PMCID: PMC4289893 DOI: 10.1038/srep07649] [Citation(s) in RCA: 93] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Accepted: 11/27/2014] [Indexed: 12/14/2022] Open
Abstract
The Cystic Fibrosis (CF) lung harbors a complex, polymicrobial ecosystem, in which Pseudomonas aeruginosa is capable of sustaining chronic infections, which are highly resistant to multiple antibiotics. Here, we investigate the phenotypic and genotypic diversity of 44 morphologically identical P. aeruginosa isolates taken from a single CF patient sputum sample. Comprehensive phenotypic analysis of isolates revealed large variances and trade-offs in growth, virulence factors and quorum sensing (QS) signals. Whole genome analysis of 22 isolates revealed high levels of intra-isolate diversity ranging from 5 to 64 SNPs and that recombination and not spontaneous mutation was the dominant driver of diversity in this population. Furthermore, phenotypic differences between isolates were not linked to mutations in known genes but were statistically associated with distinct recombination events. We also assessed antibiotic susceptibility of all isolates. Resistance to antibiotics significantly increased when multiple isolates were mixed together. Our results highlight the significant role of recombination in generating phenotypic and genetic diversification during in vivo chronic CF infection. We also discuss (i) how these findings could influence how patient-to-patient transmission studies are performed using whole genome sequencing, and (ii) the need to refine antibiotic susceptibility testing in sputum samples taken from patients with CF.
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Affiliation(s)
- Sophie E Darch
- School of Life Sciences, University of Nottingham, Nottingham, NG7 2RD, U.K
| | - Alan McNally
- Pathogen Research Group, Nottingham Trent University, Nottingham, U.K
| | - Freya Harrison
- School of Life Sciences, University of Nottingham, Nottingham, NG7 2RD, U.K
| | - Jukka Corander
- Department of Mathematics and Statistics, University of Helsinki, Finland
| | - Helen L Barr
- Division of Respiratory Medicine, Nottingham City Hospital, Nottingham, NG5 1PB, U.K
| | - Konrad Paszkiewicz
- College of Life and Environmental Sciences, University of Exeter, Exeter
| | - Stephen Holden
- Department of Clinical Microbiology, Nottingham University NHS Trust, U.K
| | - Andrew Fogarty
- Division of Epidemiology &Public Health, Nottingham City Hospital, Nottingham, NG5 1PB, U.K
| | - Shanika A Crusz
- 1] School of Life Sciences, University of Nottingham, Nottingham, NG7 2RD, U.K. [2] Department of Clinical Microbiology, Nottingham University NHS Trust, U.K
| | - Stephen P Diggle
- School of Life Sciences, University of Nottingham, Nottingham, NG7 2RD, U.K
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Wu D, Li A, Yang J, Ma F, Chen H, Pi S, Wei W. N-3-Oxo-octanoyl-homoserine lactone as a promotor to improve the microbial flocculant production by an exopolysaccharide bioflocculant-producing bacterium Agrobacterium tumefaciens F2. RSC Adv 2015. [DOI: 10.1039/c5ra15657b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This study showed thatAgrobacterium tumefaciensF2 can produceN-3-oxo-octanoyl-homoserine lactone (3-oxo-C8HSL), one of theN-acyl-homoserine lactone (AHL) class of microbial quorum-sensing signaling molecules.
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Affiliation(s)
- Dan Wu
- State Key Laboratory of Urban Water Resource and Environment
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin 150090
- People's Republic of China
| | - Ang Li
- State Key Laboratory of Urban Water Resource and Environment
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin 150090
- People's Republic of China
| | - Jixian Yang
- State Key Laboratory of Urban Water Resource and Environment
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin 150090
- People's Republic of China
| | - Fang Ma
- State Key Laboratory of Urban Water Resource and Environment
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin 150090
- People's Republic of China
| | - Han Chen
- State Key Laboratory of Urban Water Resource and Environment
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin 150090
- People's Republic of China
| | - Shanshan Pi
- State Key Laboratory of Urban Water Resource and Environment
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin 150090
- People's Republic of China
| | - Wei Wei
- State Key Laboratory of Urban Water Resource and Environment
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin 150090
- People's Republic of China
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34
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N-acyl homoserine lactone-mediated quorum sensing with special reference to use of quorum quenching bacteria in membrane biofouling control. BIOMED RESEARCH INTERNATIONAL 2014; 2014:162584. [PMID: 25147787 PMCID: PMC4131561 DOI: 10.1155/2014/162584] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Revised: 07/04/2014] [Accepted: 07/06/2014] [Indexed: 11/17/2022]
Abstract
Membrane biofouling remains a severe problem to be addressed in wastewater treatment systems affecting reactor performance and economy. The finding that many wastewater bacteria rely on N-acyl homoserine lactone-mediated quorum sensing to synchronize their activities essential for biofilm formations; the quenching bacterial quorum sensing suggests a promising approach for control of membrane biofouling. A variety of quorum quenching compounds of both synthetic and natural origin have been identified and found effective in inhibition of membrane biofouling with much less environmental impact than traditional antimicrobials. Work over the past few years has demonstrated that enzymatic quorum quenching mechanisms are widely conserved in several prokaryotic organisms and can be utilized as a potent tool for inhibition of membrane biofouling. Such naturally occurring bacterial quorum quenching mechanisms also play important roles in microbe-microbe interactions and have been used to develop sustainable nonantibiotic antifouling strategies. Advances in membrane fabrication and bacteria entrapment techniques have allowed the implication of such quorum quenching bacteria for better design of membrane bioreactor with improved antibiofouling efficacies. In view of this, the present paper is designed to review and discuss the recent developments in control of membrane biofouling with special emphasis on quorum quenching bacteria that are applied in membrane bioreactors.
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35
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Salje J. A single-cell imaging screen reveals multiple effects of secreted small molecules on bacteria. Microbiologyopen 2014; 3:426-36. [PMID: 24910069 PMCID: PMC4287172 DOI: 10.1002/mbo3.176] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2013] [Revised: 03/25/2014] [Accepted: 04/04/2014] [Indexed: 12/14/2022] Open
Abstract
Bacteria cells exist in close proximity to other cells of both the same and different species. Bacteria secrete a large number of different chemical species, and the local concentrations of these compounds at the surfaces of nearby cells may reach very high levels. It is fascinating to imagine how individual cells might sense and respond to the complex mix of signals at their surface. However, it is difficult to measure exactly what the local environmental composition looks like, or what the effects of individual compounds on nearby cells are. Here, an electron microscopy imaging screen was designed that would detect morphological changes induced by secreted small molecules. This differs from conventional approaches by detecting structural changes in individual cells rather than gene expression or growth rate changes at the population level. For example, one of the changes detected here was an increase in outer membrane vesicle production, which does not necessarily correspond to a change in gene expression. This initial study focussed on Pseudomonas aeruginosa, Escherichia coli, and Burkholderia dolosa, and revealed an intriguing range of effects of secreted small molecules on cells both within and between species.
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Affiliation(s)
- Jeanne Salje
- Harvard Medical School, 200 Longwood Avenue, Boston, Massachusetts, 02115
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36
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Loss of social behaviours in populations of Pseudomonas aeruginosa infecting lungs of patients with cystic fibrosis. PLoS One 2014; 9:e83124. [PMID: 24454693 PMCID: PMC3891558 DOI: 10.1371/journal.pone.0083124] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2013] [Accepted: 10/31/2013] [Indexed: 12/20/2022] Open
Abstract
Pseudomonas aeruginosa, is an opportunistic, bacterial pathogen causing persistent and frequently fatal infections of the lung in patients with cystic fibrosis. Isolates from chronic infections differ from laboratory and environmental strains in a range of traits and this is widely interpreted as the result of adaptation to the lung environment. Typically, chronic strains carry mutations in global regulation factors that could effect reduced expression of social traits, raising the possibility that competitive dynamics between cooperative and selfish, cheating strains could also drive changes in P. aeruginosa infections. We compared the expression of cooperative traits - biofilm formation, secretion of exo-products and quorum sensing (QS) - in P. aeruginosa isolates that were estimated to have spent different lengths of time in the lung based on clinical information. All three exo-products involved in nutrient acquisition were produced in significantly smaller quantities with increased duration of infection, and patterns across four QS signal molecules were consistent with accumulation over time of mutations in lasR, which are known to disrupt the ability of cells to respond to QS signal. Pyocyanin production, and the proportion of cells in biofilm relative to motile, free-living cells in liquid culture, did not change. Overall, our results confirm that the loss of social behaviour is a consistent trend with time spent in the lung and suggest that social dynamics are potentially relevant to understanding the behaviour of P. aeruginosa in lung infections.
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37
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Ortori CA, Halliday N, Cámara M, Williams P, Barrett DA. LC-MS/MS quantitative analysis of quorum sensing signal molecules. Methods Mol Biol 2014; 1149:255-70. [PMID: 24818911 DOI: 10.1007/978-1-4939-0473-0_21] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
Extracts taken from spent growth media from Pseudomonas aeruginosa can be analyzed for N-acyl-L-homoserine lactones and 2-alkyl-4-(1H)-quinolones (AQs), including the known quorum sensing signalling molecules of P. aeruginosa, in a specific and sensitive manner by liquid chromatography coupled with tandem mass spectrometric detection. This analysis can be conducted in a quantitative manner by comparison with matrix-matched calibration samples.
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Affiliation(s)
- Catharine A Ortori
- Centre for Analytical Bioscience, School of Pharmacy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
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38
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Mastroleo F, Van Houdt R, Atkinson S, Mergeay M, Hendrickx L, Wattiez R, Leys N. Modelled microgravity cultivation modulates N-acylhomoserine lactone production in Rhodospirillum rubrum S1H independently of cell density. Microbiology (Reading) 2013; 159:2456-2466. [DOI: 10.1099/mic.0.066415-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Affiliation(s)
- Felice Mastroleo
- Unit for Microbiology, Belgian Nuclear Research Centre (SCK•CEN), Mol, Belgium
| | - Rob Van Houdt
- Unit for Microbiology, Belgian Nuclear Research Centre (SCK•CEN), Mol, Belgium
| | - Steve Atkinson
- School of Molecular Medical Sciences, University of Nottingham, Nottingham, UK
| | - Max Mergeay
- Unit for Microbiology, Belgian Nuclear Research Centre (SCK•CEN), Mol, Belgium
| | - Larissa Hendrickx
- Unit for Microbiology, Belgian Nuclear Research Centre (SCK•CEN), Mol, Belgium
| | - Ruddy Wattiez
- Research Institute of Biosciences, Proteomic and Microbiology Laboratory, Université de Mons, Mons, Belgium
| | - Natalie Leys
- Unit for Microbiology, Belgian Nuclear Research Centre (SCK•CEN), Mol, Belgium
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39
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Twigg MS, Tait K, Williams P, Atkinson S, Cámara M. Interference with the germination and growth of
U
lva
zoospores by quorum‐sensing molecules from
U
lva
‐associated epiphytic bacteria. Environ Microbiol 2013; 16:445-53. [DOI: 10.1111/1462-2920.12203] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Accepted: 06/22/2013] [Indexed: 11/30/2022]
Affiliation(s)
- Matthew S. Twigg
- School of Molecular Medical Sciences Centre for Biomedical Sciences University of Nottingham NG7 2RD Nottingham UK
- Plymouth Marine Laboratory Prospect Place Plymouth PL1 3DH UK
| | - Karen Tait
- Plymouth Marine Laboratory Prospect Place Plymouth PL1 3DH UK
| | - Paul Williams
- School of Molecular Medical Sciences Centre for Biomedical Sciences University of Nottingham NG7 2RD Nottingham UK
| | - Steve Atkinson
- School of Molecular Medical Sciences Centre for Biomedical Sciences University of Nottingham NG7 2RD Nottingham UK
| | - Miguel Cámara
- School of Molecular Medical Sciences Centre for Biomedical Sciences University of Nottingham NG7 2RD Nottingham UK
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40
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Jakobsen TH, Bjarnsholt T, Jensen PØ, Givskov M, Høiby N. Targeting quorum sensing in Pseudomonas aeruginosa biofilms: current and emerging inhibitors. Future Microbiol 2013; 8:901-21. [DOI: 10.2217/fmb.13.57] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Bacterial resistance to conventional antibiotics combined with an increasing acknowledgement of the role of biofilms in chronic infections has led to a growing interest in new antimicrobial strategies that target the biofilm mode of growth. In the aggregated biofilm mode, cell-to-cell communication systems involved in the process known as quorum sensing regulate coordinated expression of virulence with immune shielding mechanisms and antibiotic resistance. For two decades, the potential of interference with quorum sensing by small chemical compounds has been investigated with the aim of developing alternative antibacterial strategies. Here, we review state of the art research of quorum sensing inhibitors against the opportunistic human pathogen Pseudomonas aeruginosa, which is found in a number of biofilm-associated infections and identified as the predominant organism infecting the lungs of cystic fibrosis patients.
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Affiliation(s)
- Tim Holm Jakobsen
- Costerton Biofilm Center, Department of International Health, Immunology & Microbiology, University of Copenhagen, DK-2200 Copenhagen, Denmark
| | - Thomas Bjarnsholt
- Costerton Biofilm Center, Department of International Health, Immunology & Microbiology, University of Copenhagen, DK-2200 Copenhagen, Denmark
- Department of Clinical Microbiology, Rigshospitalet, DK-2100 Copenhagen, Denmark
| | - Peter Østrup Jensen
- Department of Clinical Microbiology, Rigshospitalet, DK-2100 Copenhagen, Denmark
| | - Michael Givskov
- Costerton Biofilm Center, Department of International Health, Immunology & Microbiology, University of Copenhagen, DK-2200 Copenhagen, Denmark
- Singapore Centre on Environmental Life Sciences Engineering, Nanyang Technological University, Singapore
| | - Niels Høiby
- Department of Clinical Microbiology, Rigshospitalet, DK-2100 Copenhagen, Denmark
- Costerton Biofilm Center, Department of International Health, Immunology & Microbiology, University of Copenhagen, DK-2200 Copenhagen, Denmark.
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41
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Torres M, Romero M, Prado S, Dubert J, Tahrioui A, Otero A, Llamas I. N-acylhomoserine lactone-degrading bacteria isolated from hatchery bivalve larval cultures. Microbiol Res 2013; 168:547-54. [PMID: 23743010 DOI: 10.1016/j.micres.2013.04.011] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2012] [Revised: 04/26/2013] [Accepted: 04/27/2013] [Indexed: 10/26/2022]
Abstract
Quorum sensing (QS) systems, which depend on N-acylhomoserine lactone (AHL) signal molecules, mediate the production of virulence factors in many pathogenic microorganisms. One hundred and forty-six bacterial strains, isolated from a bivalve hatchery, were screened for their capacity to degrade five synthetic AHLs [N-butyryl-DL-homoserine lactone (C4-HSL), N-hexanoyl-DL-homoserine lactone (C6-HSL), N-octanoyl-DL-homoserine lactone (C8-HSL), N-decanoyl-DL-homoserine lactone (C10-HSL) and N-dodecanoyl-DL-homoserine lactone (C12-HSL)] using well diffusion agar-plate assays with three biosensors, Chromobacterium violaceum CV026, C. violaceum VIR07 and Agrobacterium tumefaciens NTL4 (pZLR4). The results of these assays led to our choosing four strains (PP2-67, PP2-459, PP2-644 and PP2-663) that were able to degrade all five synthetic AHLs, thus showing a wide spectrum of quorum quenching (QQ) activity. We subsequently confirmed and measured the QQ activity of the four strains by high-performance liquid chromatography plus mass-spectrometry analysis (HPLC-MS). One of the strains which showed the highest AHL-degrading activity, PP2-459, identified as being a member of the genus Thalassomonas was chosen for further study. Finally, using thin-layer chromatography (TLC), we went on to confirm this strain's capacity to degrade the AHLs produced by other non-pathogenic and pathogenic bacteria not taxonomically related.
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Affiliation(s)
- Marta Torres
- Department of Microbiology, Faculty of Pharmacy, Cartuja Campus, University of Granada, 18071 Granada, Spain
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42
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LaRock CN, Yu J, Horswill AR, Parsek MR, Minion FC. Transcriptome analysis of acyl-homoserine lactone-based quorum sensing regulation in Yersinia pestis [corrected]. PLoS One 2013; 8:e62337. [PMID: 23620823 PMCID: PMC3631167 DOI: 10.1371/journal.pone.0062337] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2012] [Accepted: 03/20/2013] [Indexed: 11/19/2022] Open
Abstract
The etiologic agent of bubonic plague, Yersinia pestis, senses self-produced, secreted chemical signals in a process named quorum sensing. Though the closely related enteric pathogen Y. pseudotuberculosis uses quorum sensing system to regulate motility, the role of quorum sensing in Y. pestis has been unclear. In this study we performed transcriptional profiling experiments to identify Y. pestis quorum sensing regulated functions. Our analysis revealed that acyl-homoserine lactone-based quorum sensing controls the expression of several metabolic functions. Maltose fermentation and the glyoxylate bypass are induced by acyl-homoserine lactone signaling. This effect was observed at 30°C, indicating a potential role for quorum sensing regulation of metabolism at temperatures below the normal mammalian temperature. It is proposed that utilization of alternative carbon sources may enhance growth and/or survival during prolonged periods in natural habitats with limited nutrient sources, contributing to maintenance of plague in nature.
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Affiliation(s)
- Christopher N. LaRock
- Department of Microbiology, University of Washington, Seattle, Washington, United States of America
| | - Jing Yu
- Department of Veterinary Microbiology and Preventive Medicine, Iowa State University, Ames, Iowa, United States of America
| | - Alexander R. Horswill
- Department of Microbiology, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Matthew R. Parsek
- Department of Microbiology, University of Washington, Seattle, Washington, United States of America
| | - F. Chris Minion
- Department of Veterinary Microbiology and Preventive Medicine, Iowa State University, Ames, Iowa, United States of America
- * E-mail:
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43
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Abstract
Many Proteobacteria are capable of quorum sensing using N-acyl-homoserine lactone (acyl-HSL) signaling molecules that are synthesized by LuxI or LuxM homologs and detected by transcription factors of the LuxR family. Most quorum-sensing species have at least one LuxR and one LuxI homolog. However, members of the Escherichia, Salmonella, Klebsiella, and Enterobacter genera possess only a single LuxR homolog, SdiA, and no acyl-HSL synthase. The most obvious hypothesis is that these organisms are eavesdropping on acyl-HSL production within the complex microbial communities of the mammalian intestinal tract. However, there is currently no evidence of acyl-HSLs being produced within normal intestinal communities. A few intestinal pathogens, including Yersinia enterocolitica, do produce acyl-HSLs, and Salmonella can detect them during infection. Therefore, a more refined hypothesis is that SdiA orthologs are used for eavesdropping on other quorum-sensing pathogens in the host. However, the lack of acyl-HSL signaling among the normal intestinal residents is a surprising finding given the complexity of intestinal communities. In this review, we examine the evidence for and against the possibility of acyl-HSL signaling molecules in the mammalian intestine and discuss the possibility that related signaling molecules might be present and awaiting discovery.
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44
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Yin WF, Purmal K, Chin S, Chan XY, Chan KG. Long chain N-acyl homoserine lactone production by Enterobacter sp. isolated from human tongue surfaces. SENSORS 2012. [PMID: 23202161 PMCID: PMC3522914 DOI: 10.3390/s121114307] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
We report the isolation of N-acyl homoserine lactone-producing Enterobacter sp. isolate T1-1 from the posterior dorsal surfaces of the tongue of a healthy individual. Spent supernatants extract from Enterobacter sp. isolate T1-1 activated the biosensor Agrobacterium tumefaciens NTL4(pZLR4), suggesting production of long chain AHLs by these isolates. High resolution mass spectrometry analysis of these extracts confirmed that Enterobacter sp. isolate T1-1 produced a long chain N-acyl homoserine lactone, namely N-dodecanoyl-homoserine lactone (C12-HSL). To the best of our knowledge, this is the first isolation of Enterobacter sp., strain T1-1 from the posterior dorsal surface of the human tongue and N-acyl homoserine lactones production by this bacterium.
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Affiliation(s)
- Wai-Fong Yin
- Division of Genetics and Molecular Biology, Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia; E-Mails: (W.-F.Y.); (S.C.); (X.-Y.C.)
| | - Kathiravan Purmal
- Department of General Dental Practice and Oral and Maxillofacial Imaging, Faculty of Dentistry, Universiti Sains Malaysia, 50603 Kuala Lumpur, Malaysia; E-Mail:
| | - Shenyang Chin
- Division of Genetics and Molecular Biology, Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia; E-Mails: (W.-F.Y.); (S.C.); (X.-Y.C.)
| | - Xin-Yue Chan
- Division of Genetics and Molecular Biology, Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia; E-Mails: (W.-F.Y.); (S.C.); (X.-Y.C.)
| | - Kok-Gan Chan
- Division of Genetics and Molecular Biology, Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia; E-Mails: (W.-F.Y.); (S.C.); (X.-Y.C.)
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +603-7967-5162; Fax: +603-7967-4509
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Cataldi TRI, Bianco G, Fonseca J, Schmitt-Kopplin P. Perceiving the chemical language of Gram-negative bacteria: listening by high-resolution mass spectrometry. Anal Bioanal Chem 2012; 405:493-507. [PMID: 22986985 DOI: 10.1007/s00216-012-6371-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2012] [Revised: 08/06/2012] [Accepted: 08/17/2012] [Indexed: 01/27/2023]
Abstract
Gram-negative bacteria use N-acylhomoserine lactones (AHLs) as their command language to coordinate population behavior during invasion and colonization of higher organisms. Although many different bacterial bioreporters are available for AHLs monitoring, in which a phenotypic response, e.g. bioluminescence, violacin production, and β-galactosidase activity, is exploited, mass spectrometry (MS) is the most versatile detector for rapid analysis of AHLs in complex microbial samples, with or without prior separation steps. In this paper we critically review recent advances in the application of high-resolution MS to analysis of the quorum sensing (QS) signaling molecules used by Gram-negative bacteria, with much emphasis on AHLs. A critical review of the use of bioreporters in the study of AHLs is followed by a short methodological survey of the capabilities of high-resolution mass spectrometry (HRMS), including Fourier-transform ion cyclotron resonance (FTICR) MS and quadrupole time-of-flight (qTOF) MS. Use of infusion electrospray ultrahigh-resolution FTICR MS (12 Tesla) enables accurate mass measurements for determination of the elemental formulas of AHLs in Acidovorax sp. N35 and Burkholderia ubonensis AB030584. Results obtained by coupling liquid chromatography with a hybrid quadrupole linear ion trap-FTICR mass spectrometer (LC-LTQ-FTICRMS, 7-T) for characterization of acylated homoserine lactones in the human pathogen Pseudomonas aeruginosa are presented. UPLC-ESI-qTOF MS has also proved to be suitable for identification of 3O-C(10)HSL in Pseudomonas putida IsoF cell culture supernatant. Aspects of sample preparation and the avoidance of analytical pitfalls are also emphasized.
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Affiliation(s)
- Tommaso R I Cataldi
- Dipartimento di Chimica, Università degli Studi di Bari Aldo Moro, Bari, Italy.
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46
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Zhai C, Zhang P, Shen F, Zhou C, Liu C. Does Microcystis aeruginosa have quorum sensing? FEMS Microbiol Lett 2012; 336:38-44. [PMID: 22861498 DOI: 10.1111/j.1574-6968.2012.02650.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2012] [Revised: 07/27/2012] [Accepted: 07/28/2012] [Indexed: 11/29/2022] Open
Abstract
Quorum sensing (QS) is a system of cell-to-cell communication by means of intercellular signaling molecules to coordinate a set of targeted gene expression or repression in many Gram-negative bacteria; it plays important roles for bacteria in adaptation to adverse environmental conditions. In this study, we first demonstrated that Microcystis aeruginosa PCC-7820 could produce QS-related signal acylated homoserine lactones (AHLs) among the metabolite of axenic M. aeruginosa, based on bioassay and liquid chromatography-mass spectrometry (LC-MS) analysis. The concentration of the AHLs in the culture medium was cell density dependent and reached a maximum of 18 nM at 1.03 × 10(7) cells mL(-1), 30 days after inoculation. The regulation mechanism of QS in M. aeruginosa and its possible role in bloom formation are discussed.
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Affiliation(s)
- Chunmei Zhai
- State Key Laboratory of Pharmaceutical Biotechnology, School of Life Science, Nanjing University, Nanjing, China
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47
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Garner AL, Kim SK, Zhu J, Struss AK, Watkins R, Feske BD, Kaufmann GF, Janda KD. Stereochemical insignificance discovered in Acinetobacter baumannii quorum sensing. PLoS One 2012; 7:e37102. [PMID: 22629354 PMCID: PMC3358330 DOI: 10.1371/journal.pone.0037102] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2011] [Accepted: 04/17/2012] [Indexed: 11/18/2022] Open
Abstract
Stereochemistry is a key aspect of molecular recognition for biological systems. As such, receptors and enzymes are often highly stereospecific, only recognizing one stereoisomer of a ligand. Recently, the quorum sensing signaling molecules used by the nosocomial opportunistic pathogen, Acinetobacter baumannii, were identified, and the primary signaling molecule isolated from this species was N-(3-hydroxydodecanoyl)-L-homoserine lactone. A plethora of bacterial species have been demonstrated to utilize 3-hydroxy-acylhomoserine lactone autoinducers, and in virtually all cases, the (R)-stereoisomer was identified as the natural ligand and exhibited greater autoinducer activity than the corresponding (S)-stereoisomer. Using chemical synthesis and biochemical assays, we have uncovered a case of stereochemical insignificance in A. baumannii and provide a unique example where stereochemistry appears nonessential for acylhomoserine lactone-mediated quorum sensing signaling. Based on previously reported phylogenetic studies, we suggest that A. baumannii has evolutionarily adopted this unique, yet promiscuous quorum sensing system to ensure its survival, particularly in the presence of other proteobacteria.
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Affiliation(s)
- Amanda L. Garner
- Departments of Chemistry and Immunology and Microbial Science, The Scripps Research Institute, La Jolla, California, United States of America
- The Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, California, United States of America
- The Worm Institute for Research and Medicine, The Scripps Research Institute, La Jolla, California, United States of America
| | - Sook Kyung Kim
- Departments of Chemistry and Immunology and Microbial Science, The Scripps Research Institute, La Jolla, California, United States of America
- The Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, California, United States of America
| | - Jie Zhu
- Departments of Chemistry and Immunology and Microbial Science, The Scripps Research Institute, La Jolla, California, United States of America
- The Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, California, United States of America
| | - Anjali Kumari Struss
- Departments of Chemistry and Immunology and Microbial Science, The Scripps Research Institute, La Jolla, California, United States of America
- The Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, California, United States of America
| | - Richard Watkins
- Department of Chemistry, Armstrong Atlantic State University, Savannah, Georgia, United States of America
| | - Brent D. Feske
- Department of Chemistry, Armstrong Atlantic State University, Savannah, Georgia, United States of America
| | - Gunnar F. Kaufmann
- Departments of Chemistry and Immunology and Microbial Science, The Scripps Research Institute, La Jolla, California, United States of America
- The Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, California, United States of America
| | - Kim D. Janda
- Departments of Chemistry and Immunology and Microbial Science, The Scripps Research Institute, La Jolla, California, United States of America
- The Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, California, United States of America
- The Worm Institute for Research and Medicine, The Scripps Research Institute, La Jolla, California, United States of America
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48
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Yin WF, Purmal K, Chin S, Chan XY, Koh CL, Sam CK, Chan KG. N-acyl homoserine lactone production by Klebsiella pneumoniae isolated from human tongue surface. SENSORS 2012; 12:3472-83. [PMID: 22737019 PMCID: PMC3376583 DOI: 10.3390/s120303472] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Revised: 02/16/2012] [Accepted: 02/23/2012] [Indexed: 11/16/2022]
Abstract
Bacteria communicate by producing quorum sensing molecules called autoinducers, which include autoinducer-1, an N-hexanoyl homoserine lactone (AHL), and autoinducer-2. Bacteria present in the human oral cavity have been shown to produce autoinducer-2, but not AHL. Here, we report the isolation of two AHL-producing Klebsiella pneumoniae strains from the posterior dorsal surface of the tongue of a healthy individual. Spent culture supernatant extracts from K. pneumoniae activated the biosensors Agrobacterium tumefaciens NTL4(pZLR4) and Escherichia coli [pSB401], suggesting the presence of both long and short chain AHLs. High resolution mass spectrometry analyses of these extracts confirmed that both K. pneumoniae isolates produced N-octanoylhomoserine lactone and N-3-dodecanoyl-L-homoserine lactone. To the best of our knowledge, this is the first report of the isolation of K. pneumoniae from the posterior dorsal surface of the human tongue and the production of these AHLs by this bacterium.
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Affiliation(s)
- Wai-Fong Yin
- Division of Genetics and Molecular Biology, Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia; E-Mails: (W.-F.Y.); (S.C.); (X.-Y.C.)
| | - Kathiravan Purmal
- School of Dental Sciences, Universiti Sains Malaysia, 16150 Kubang Kerian, Kelantan, Malaysia; E-Mail:
| | - Shenyang Chin
- Division of Genetics and Molecular Biology, Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia; E-Mails: (W.-F.Y.); (S.C.); (X.-Y.C.)
| | - Xin-Yue Chan
- Division of Genetics and Molecular Biology, Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia; E-Mails: (W.-F.Y.); (S.C.); (X.-Y.C.)
| | - Chong-Lek Koh
- Natural Sciences and Science Education AG, National Institute of Education, Nanyang Technological University, 1 Nanyang Walk, 637616, Singapore; E-Mails: (C.-L.K.); (C.-K.S.)
| | - Choon-Kook Sam
- Natural Sciences and Science Education AG, National Institute of Education, Nanyang Technological University, 1 Nanyang Walk, 637616, Singapore; E-Mails: (C.-L.K.); (C.-K.S.)
| | - Kok-Gan Chan
- Division of Genetics and Molecular Biology, Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia; E-Mails: (W.-F.Y.); (S.C.); (X.-Y.C.)
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +603-7967-5162; Fax: +603-7967-4509
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Truchado P, Tomás-Barberán FA, Larrosa M, Allende A. Food phytochemicals act as Quorum Sensing inhibitors reducing production and/or degrading autoinducers of Yersinia enterocolitica and Erwinia carotovora. Food Control 2012. [DOI: 10.1016/j.foodcont.2011.09.006] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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50
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Nieto-Peñalver CG, Bertini EV, de Figueroa LIC. Identification of N-acyl homoserine lactones produced by Gluconacetobacter diazotrophicus PAL5 cultured in complex and synthetic media. Arch Microbiol 2012; 194:615-22. [PMID: 22350020 DOI: 10.1007/s00203-012-0794-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2011] [Revised: 12/19/2011] [Accepted: 12/22/2011] [Indexed: 11/28/2022]
Abstract
The endophytic diazotrophic Gluconacetobacter diazotrophicus PAL5 was originally isolated from sugarcane (Saccharum officinarum). The biological nitrogen fixation, phytohormones secretion, solubilization of mineral nutrients and phytopathogen antagonism allow its classification as a plant growth-promoting bacterium. The recent genomic sequence of PAL5 unveiled the presence of a quorum sensing (QS) system. QS are regulatory mechanisms that, through the production of signal molecules or autoinducers, permit a microbial population the regulation of the physiology in a coordinated manner. The most studied autoinducers in gram-negative bacteria are the N-acyl homoserine lactones (AHLs). The usage of biosensor strains evidenced the presence of AHL-like molecules in cultures of G. diazotrophicus PAL5 grown in complex and synthetic media. Analysis of AHLs performed by LC-APCI-MS permitted the identification of eight different signal molecules, including C6-, C8-, C10-, C12- and C14-HSL. Mass spectra confirmed that this diazotrophic strain also synthesizes autoinducers with carbonyl substitutions in the acyl chain. No differences in the profile of AHLs could be determined under both culture conditions. However, although the level of short-chain AHLs was not affected, a decrease of 30% in the production of long-chain AHLs could be measured in synthetic medium.
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Affiliation(s)
- Carlos G Nieto-Peñalver
- PROIMI, CONICET (Planta Piloto de Procesos Industriales Microbiológicos), Av. Belgrano y Caseros, T4001MVB, Tucumán, Argentina.
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