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Gado WS, Al-Gamal AG, Badawy MSEM, Labena A, Zakaria K, Kabel KI. Detectable quorum signaling molecule via PANI-metal oxides nanocomposites sensors. Sci Rep 2024; 14:10041. [PMID: 38693218 PMCID: PMC11063039 DOI: 10.1038/s41598-024-60093-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Accepted: 04/18/2024] [Indexed: 05/03/2024] Open
Abstract
The detection of N-hexanoyl-l-homoserine lactone (C6-HSL), a crucial signal in Gram-negative bacterial communication, is essential for addressing microbiologically influenced corrosion (MIC) induced by sulfate-reducing bacteria (SRB) in oil and gas industries. Metal oxides (MOx) intercalated into conducting polymers (CPs) offer a promising sensing approach due to their effective detection of biological molecules such as C6-HSL. In this study, we synthesized and characterized two MOx/polyaniline-dodecyl benzene sulfonic acid (PANI-DBSA) nanocomposites, namely ZnO/PANI-DBSA and Fe2O3/PANI-DBSA. These nanocomposites were applied with 1% by-weight carbon paste over a carbon working electrode (WE) for qualitative and quantitative detection of C6-HSL through electrochemical analysis. The electrochemical impedance spectroscopy (EIS) confirmed the composites' capability to monitor C6-HSL produced by SRB-biofilm, with detection limits of 624 ppm for ZnO/PANI-DBSA and 441 ppm for Fe2O3/PANI-DBSA. Furthermore, calorimetric measurements validated the presence of SRB-biofilm, supporting the EIS analysis. The utilization of these MOx/CP nanocomposites offers a practical approach for detecting C6-HSL and monitoring SRB-biofilm formation, aiding in MIC management in oil and gas wells. The ZnO/PANI-DBSA-based sensor exhibited higher sensitivity towards C6-HSL compared to Fe2O3/PANI-DBSA, indicating its potential for enhanced detection capabilities in this context. Stability tests revealed ZnO/PANI-DBSA's superior stability over Fe2O3/PANI-DBSA, with both sensors retaining approximately 85-90% of their initial current after 1 month, demonstrating remarkable reproducibility and durability.
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Affiliation(s)
- Walaa S Gado
- Egyptian Petroleum Research Institute (EPRI), 11727, Nasr City, Cairo, Egypt.
| | | | - Mona Shaban E M Badawy
- Department of Microbiology and Immunology, Faculty of Pharmacy (Girls), Al-Azhar University, Cairo, Egypt
| | - A Labena
- Egyptian Petroleum Research Institute (EPRI), 11727, Nasr City, Cairo, Egypt
| | - Khaled Zakaria
- Egyptian Petroleum Research Institute (EPRI), 11727, Nasr City, Cairo, Egypt
| | - Khalid I Kabel
- Egyptian Petroleum Research Institute (EPRI), 11727, Nasr City, Cairo, Egypt
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2
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Monzón-Atienza L, Bravo J, Torrecillas S, Gómez-Mercader A, Montero D, Ramos-Vivas J, Galindo-Villegas J, Acosta F. An In-Depth Study on the Inhibition of Quorum Sensing by Bacillus velezensis D-18: Its Significant Impact on Vibrio Biofilm Formation in Aquaculture. Microorganisms 2024; 12:890. [PMID: 38792721 PMCID: PMC11123725 DOI: 10.3390/microorganisms12050890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2024] [Revised: 04/24/2024] [Accepted: 04/26/2024] [Indexed: 05/26/2024] Open
Abstract
Amid growing concerns about antibiotic resistance, innovative strategies are imperative in addressing bacterial infections in aquaculture. Quorum quenching (QQ), the enzymatic inhibition of quorum sensing (QS), has emerged as a promising solution. This study delves into the QQ capabilities of the probiotic strain Bacillus velezensis D-18 and its products, particularly in Vibrio anguillarum 507 communication and biofilm formation. Chromobacterium violaceum MK was used as a biomarker in this study, and the results confirmed that B. velezensis D-18 effectively inhibits QS. Further exploration into the QQ mechanism revealed the presence of lactonase activity by B. velezensis D-18 that degraded both long- and short-chain acyl homoserine lactones (AHLs). PCR analysis demonstrated the presence of a homologous lactonase-producing gene, ytnP, in the genome of B. velezensis D-18. The study evaluated the impact of B. velezensis D-18 on V. anguillarum 507 growth and biofilm formation. The probiotic not only controls the biofilm formation of V. anguillarum but also significantly restrains pathogen growth. Therefore, B. velezensis D-18 demonstrates substantial potential for preventing V. anguillarum diseases in aquaculture through its QQ capacity. The ability to disrupt bacterial communication and control biofilm formation positions B. velezensis D-18 as a promising eco-friendly alternative to conventional antibiotics in managing bacterial diseases in aquaculture.
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Affiliation(s)
- Luis Monzón-Atienza
- Grupo de Investigación en Acuicultura (GIA), Instituto Ecoaqua, Universidad de Las Palmas de Gran Canaria, 35001 Las Palmas de Gran Canaria, Spain; (L.M.-A.); (S.T.); (A.G.-M.); (J.R.-V.)
| | - Jimena Bravo
- Grupo de Investigación en Acuicultura (GIA), Instituto Ecoaqua, Universidad de Las Palmas de Gran Canaria, 35001 Las Palmas de Gran Canaria, Spain; (L.M.-A.); (S.T.); (A.G.-M.); (J.R.-V.)
| | - Silvia Torrecillas
- Grupo de Investigación en Acuicultura (GIA), Instituto Ecoaqua, Universidad de Las Palmas de Gran Canaria, 35001 Las Palmas de Gran Canaria, Spain; (L.M.-A.); (S.T.); (A.G.-M.); (J.R.-V.)
- Aquaculture Program, Institut de Recerca i Tecnologia Agroalimentáries (IRTA), Centre de Sant Carles de la Rápita (IRTA-SCR), 43540 Sant Carles de la Rápita, Spain
| | - Antonio Gómez-Mercader
- Grupo de Investigación en Acuicultura (GIA), Instituto Ecoaqua, Universidad de Las Palmas de Gran Canaria, 35001 Las Palmas de Gran Canaria, Spain; (L.M.-A.); (S.T.); (A.G.-M.); (J.R.-V.)
| | - Daniel Montero
- Grupo de Investigación en Acuicultura (GIA), Instituto Ecoaqua, Universidad de Las Palmas de Gran Canaria, 35001 Las Palmas de Gran Canaria, Spain; (L.M.-A.); (S.T.); (A.G.-M.); (J.R.-V.)
| | - José Ramos-Vivas
- Grupo de Investigación en Acuicultura (GIA), Instituto Ecoaqua, Universidad de Las Palmas de Gran Canaria, 35001 Las Palmas de Gran Canaria, Spain; (L.M.-A.); (S.T.); (A.G.-M.); (J.R.-V.)
- Research Group on Foods, Nutritional Biochemistry and Health, Universidad Europea del Atlántico, 39010 Santander, Spain
| | - Jorge Galindo-Villegas
- Deparment of Genomics, Faculty of Biosciences and Aquaculture, Nord University, 8026 Bodø, Norway;
| | - Félix Acosta
- Grupo de Investigación en Acuicultura (GIA), Instituto Ecoaqua, Universidad de Las Palmas de Gran Canaria, 35001 Las Palmas de Gran Canaria, Spain; (L.M.-A.); (S.T.); (A.G.-M.); (J.R.-V.)
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3
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Lopez Marin MA, Strejcek M, Uhlik O. Joining the bacterial conversation: increasing the cultivation efficiency of soil bacteria with acyl-homoserine lactones and cAMP. Microbiol Spectr 2023; 11:e0186023. [PMID: 37787516 PMCID: PMC10715134 DOI: 10.1128/spectrum.01860-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Accepted: 08/17/2023] [Indexed: 10/04/2023] Open
Abstract
IMPORTANCE Microorganisms are a repository of interesting metabolites and functions. Therefore, accessing them is an important exercise for advancing not only basic questions about their physiology but also to advance technological applications. In this sense, increasing the culturability of environmental microorganisms remains an important endeavor for modern microbiology. Because microorganisms do not live in isolation in their environments, molecules can be added to the cultivation strategies to "inform them" that they are present in growth-permissive environmental conditions. Signaling molecules such as acyl-homoserine lactones and 3',5'-cyclic adenosine monophosphate belong to the plethora of molecules used by bacteria to communicate with each other in a phenomenon called quorum sensing. Therefore, including quorum sensing molecules can be an incentive for microorganisms, specifically soil bacteria, to increase their numbers on solid media.
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Affiliation(s)
- Marco A. Lopez Marin
- Department of Biochemistry and Microbiology, University of Chemistry and Technology, Faculty of Food and Biochemical Technology, Prague, Czech Republic
- Department of Water Technology and Environmental Engineering, University of Chemistry and Technology Prague, Prague, Czechia
| | - Michal Strejcek
- Department of Biochemistry and Microbiology, University of Chemistry and Technology, Faculty of Food and Biochemical Technology, Prague, Czech Republic
| | - Ondrej Uhlik
- Department of Biochemistry and Microbiology, University of Chemistry and Technology, Faculty of Food and Biochemical Technology, Prague, Czech Republic
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Otero-Asman JR, Sánchez-Jiménez A, Bastiaansen KC, Wettstadt S, Civantos C, García-Puente A, Bitter W, Llamas MA. The Prc and CtpA proteases modulate cell-surface signaling activity and virulence in Pseudomonas aeruginosa. iScience 2023; 26:107216. [PMID: 37534181 PMCID: PMC10392083 DOI: 10.1016/j.isci.2023.107216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 05/17/2023] [Accepted: 06/22/2023] [Indexed: 08/04/2023] Open
Abstract
Cell-surface signaling (CSS) is a signal transfer system of Gram-negative bacteria that produces the activation of an extracytoplasmic function σ factor (σECF) in the cytosol in response to an extracellular signal. Activation requires the regulated and sequential proteolysis of the σECF-associated anti-σ factor, and the function of the Prc and RseP proteases. In this work, we have identified another protease that modulates CSS activity, namely the periplasmic carboxyl-terminal processing protease CtpA. CtpA functions upstream of Prc in the proteolytic cascade and seems to prevent the Prc-mediated proteolysis of the CSS anti-σ factor. Importantly, using zebrafish embryos and the A549 lung epithelial cell line as hosts, we show that mutants in the rseP and ctpA proteases of the human pathogen Pseudomonas aeruginosa are considerably attenuated in virulence while the prc mutation increases virulence likely by enhancing the production of membrane vesicles.
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Affiliation(s)
- Joaquín R. Otero-Asman
- Department of Biotechnology and Environmental Protection, Estación Experimental del Zaidín-Consejo Superior de Investigaciones Científicas, 18008 Granada, Spain
| | - Ana Sánchez-Jiménez
- Department of Biotechnology and Environmental Protection, Estación Experimental del Zaidín-Consejo Superior de Investigaciones Científicas, 18008 Granada, Spain
| | - Karlijn C. Bastiaansen
- Department of Biotechnology and Environmental Protection, Estación Experimental del Zaidín-Consejo Superior de Investigaciones Científicas, 18008 Granada, Spain
- Department of Medical Microbiology and Infection Control, Amsterdam University medical centres, location VU University, 1081 HV Amsterdam, The Netherlands
| | - Sarah Wettstadt
- Department of Biotechnology and Environmental Protection, Estación Experimental del Zaidín-Consejo Superior de Investigaciones Científicas, 18008 Granada, Spain
| | - Cristina Civantos
- Department of Biotechnology and Environmental Protection, Estación Experimental del Zaidín-Consejo Superior de Investigaciones Científicas, 18008 Granada, Spain
| | - Alicia García-Puente
- Department of Biotechnology and Environmental Protection, Estación Experimental del Zaidín-Consejo Superior de Investigaciones Científicas, 18008 Granada, Spain
| | - Wilbert Bitter
- Department of Medical Microbiology and Infection Control, Amsterdam University medical centres, location VU University, 1081 HV Amsterdam, The Netherlands
| | - María A. Llamas
- Department of Biotechnology and Environmental Protection, Estación Experimental del Zaidín-Consejo Superior de Investigaciones Científicas, 18008 Granada, Spain
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5
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Nwabor LC, Chukamnerd A, Nwabor OF, Pomwised R, Voravuthikunchai SP, Chusri S. Rifampicin Enhanced Carbapenem Activity with Improved Antibacterial Effects and Eradicates Established Acinetobacter baumannii Biofilms. Pharmaceuticals (Basel) 2023; 16:ph16040477. [PMID: 37111234 PMCID: PMC10141143 DOI: 10.3390/ph16040477] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 03/15/2023] [Accepted: 03/17/2023] [Indexed: 04/29/2023] Open
Abstract
Biofilm-mediated infections are critical to public health and a leading cause of resistance among pathogens, amounting to a prolonged hospital stay and increased mortality rate in the intensive care unit. In this study, the antibacterial and antibiofilm activities of rifampicin or carbapenem monotherapies were compared with rifampicin and carbapenem combination therapies against rifampicin-resistant and carbapenem-resistant Acinetobacter baumannii isolates. Among 29 CRAB isolates, 24/29 (83%) were resistant to rifampicin, with MIC values between 2-256 µg/mL. Checkerboard assays disclosed that combination therapies at FICIs between 1/8 and 1/4 improved the activity of carbapenems at subinhibitory concentrations. Time-kill kinetics indicated a 2- to 4-log reduction at 1/2 MIC rifampicin + 1/4 MIC carbapenem and 1/4 MIC rifampicin + 1/4 MIC carbapenem against the isolates, with the MIC values ranging from 2-8 µg/mL. The MTT assay revealed a dose-dependent decrease of the cell viability of established bacterial biofilm at 4 MIC rifampicin + 2 MIC carbapenems, with a percentage reduction of 44-75%, compared with monotherapies at 16 MIC. Scanning electron microscopy further confirmed bacterial cell membrane disruption, suggesting a synergism between carbapenem and rifampicin against a representative isolate. The findings demonstrated that the combination of rifampicin with carbapenems could improve antibacterial activities and eradicate established Acinetobacter baumannii biofilm.
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Affiliation(s)
- Lois Chinwe Nwabor
- Department of Biomedical Sciences and Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Songkhla 90110, Thailand
| | - Arnon Chukamnerd
- Division of Infectious Diseases, Department of Internal Medicine, Faculty of Medicine, Prince of Songkla University, Songkhla 90110, Thailand
| | - Ozioma Forstinus Nwabor
- Division of Infectious Diseases, Department of Internal Medicine, Faculty of Medicine, Prince of Songkla University, Songkhla 90110, Thailand
| | - Rattanaruji Pomwised
- Division of Biological Science, Faculty of Science, Prince of Songkla University, Songkhla 90110, Thailand
| | - Supayang P Voravuthikunchai
- Division of Biological Science, Faculty of Science, Prince of Songkla University, Songkhla 90110, Thailand
- Natural Product Research Center of Excellence, Faculty of Science, Prince of Songkla University, Songkhla 90110, Thailand
- Center of Antimicrobial Biomaterial Innovation-Southeast Asia, Prince of Songkla University, Songkhla 90110, Thailand
| | - Sarunyou Chusri
- Department of Biomedical Sciences and Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Songkhla 90110, Thailand
- Division of Infectious Diseases, Department of Internal Medicine, Faculty of Medicine, Prince of Songkla University, Songkhla 90110, Thailand
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6
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Ramos-Vivas J, Tapia O, Elexpuru-Zabaleta M, Pifarre KT, Armas Diaz Y, Battino M, Giampieri F. The Molecular Weaponry Produced by the Bacterium Hafnia alvei in Foods. Molecules 2022; 27:molecules27175585. [PMID: 36080356 PMCID: PMC9457839 DOI: 10.3390/molecules27175585] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Revised: 08/24/2022] [Accepted: 08/26/2022] [Indexed: 11/16/2022] Open
Abstract
Hafnia alvei is receiving increasing attention from both a medical and veterinary point of view, but the diversity of molecules it produces has made the interest in this bacterium extend to the field of probiotics, the microbiota, and above all, to its presence and action on consumer foods. The production of Acyl Homoserine Lactones (AHLs), a type of quorum-sensing (QS) signaling molecule, is the most often-studied chemical signaling molecule in Gram-negative bacteria. H. alvei can use this communication mechanism to promote the expression of certain enzymatic activities in fermented foods, where this bacterium is frequently present. H. alvei also produces a series of molecules involved in the modification of the organoleptic properties of different products, especially cheeses, where it shares space with other microorganisms. Although some strains of this species are implicated in infections in humans, many produce antibacterial compounds, such as bacteriocins, that inhibit the growth of true pathogens, so the characterization of these molecules could be very interesting from the point of view of clinical medicine and the food industry. Lastly, in some cases, H. alvei is responsible for the production of biogenic amines or other compounds of special interest in food health. In this article, we will review the most interesting molecules that produce the H. alvei strains and will discuss some of their properties, both from the point of view of their biological activity on other microorganisms and the properties of different food matrices in which this bacterium usually thrives.
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Affiliation(s)
- José Ramos-Vivas
- Research Group on Foods, Nutritional Biochemistry and Health, Universidad Europea del Atlántico, 39011 Santander, Spain
- Research Group on Foods, Nutritional Biochemistry and Health, Universidad Internacional Iberoamericana, Campeche 24560, Mexico
- CIBER of Infectious Diseases—CIBERINFEC, Instituto de Salud Carlos III, 28029 Madrid, Spain
- Correspondence: (J.R.-V.); (M.B.)
| | - Olga Tapia
- Research Group on Foods, Nutritional Biochemistry and Health, Universidad Europea del Atlántico, 39011 Santander, Spain
| | - María Elexpuru-Zabaleta
- Research Group on Foods, Nutritional Biochemistry and Health, Universidad Europea del Atlántico, 39011 Santander, Spain
| | - Kilian Tutusaus Pifarre
- Research Group on Foods, Nutritional Biochemistry and Health, Universidad Europea del Atlántico, 39011 Santander, Spain
- Research Group on Foods, Nutritional Biochemistry and Health, Universidad Internacional Iberoamericana, Campeche 24560, Mexico
| | - Yasmany Armas Diaz
- Department of Clinical Sciences, Polytechnic University of Marche, 60131 Ancona, Italy
| | - Maurizio Battino
- Research Group on Foods, Nutritional Biochemistry and Health, Universidad Europea del Atlántico, 39011 Santander, Spain
- Department of Clinical Sciences, Polytechnic University of Marche, 60131 Ancona, Italy
- International Joint Research Laboratory of Intelligent Agriculture and Agri-Products Processing, Jiangsu University, Zhenjiang 212013, China
- Correspondence: (J.R.-V.); (M.B.)
| | - Francesca Giampieri
- Research Group on Foods, Nutritional Biochemistry and Health, Universidad Europea del Atlántico, 39011 Santander, Spain
- Department of Biochemistry, Faculty of Sciences, King Abdulaziz University, Jeddah 80200, Saudi Arabia
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Sahreen S, Mukhtar H, Imre K, Morar A, Herman V, Sharif S. Exploring the Function of Quorum Sensing Regulated Biofilms in Biological Wastewater Treatment: A Review. Int J Mol Sci 2022; 23:ijms23179751. [PMID: 36077148 PMCID: PMC9456111 DOI: 10.3390/ijms23179751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Revised: 08/21/2022] [Accepted: 08/26/2022] [Indexed: 11/26/2022] Open
Abstract
Quorum sensing (QS), a type of bacterial cell–cell communication, produces autoinducers which help in biofilm formation in response to cell population density. In this review, biofilm formation, the role of QS in biofilm formation and development with reference to biological wastewater treatment are discussed. Autoinducers, for example, acyl-homoserine lactones (AHLs), auto-inducing oligo-peptides (AIPs) and autoinducer 2, present in both Gram-negative and Gram-positive bacteria, with their mechanism, are also explained. Over the years, wastewater treatment (WWT) by QS-regulated biofilms and their optimization for WWT have gained much attention. This article gives a comprehensive review of QS regulation methods, QS enrichment methods and QS inhibition methods in biological waste treatment systems. Typical QS enrichment methods comprise adding QS molecules, adding QS accelerants and cultivating QS bacteria, while typical QS inhibition methods consist of additions of quorum quenching (QQ) bacteria, QS-degrading enzymes, QS-degrading oxidants, and QS inhibitors. Potential applications of QS regulated biofilms for WWT have also been summarized. At last, the knowledge gaps present in current researches are analyzed, and future study requirements are proposed.
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Affiliation(s)
- Sania Sahreen
- Institute of Industrial Biotechnology, Government College University, Lahore 54000, Pakistan
| | - Hamid Mukhtar
- Institute of Industrial Biotechnology, Government College University, Lahore 54000, Pakistan
- Correspondence: (H.M.); (K.I.); Tel.: +92-3334245581 (H.M.); +40-256277186 (K.I.)
| | - Kálmán Imre
- Department of Animal Production and Veterinary Public Health, Faculty of Veterinary Medicine, Banat’s University of Agricultural Sciences and Veterinary Medicine “King Michael I of Romania”, 300645 Timisoara, Romania
- Correspondence: (H.M.); (K.I.); Tel.: +92-3334245581 (H.M.); +40-256277186 (K.I.)
| | - Adriana Morar
- Department of Animal Production and Veterinary Public Health, Faculty of Veterinary Medicine, Banat’s University of Agricultural Sciences and Veterinary Medicine “King Michael I of Romania”, 300645 Timisoara, Romania
| | - Viorel Herman
- Department of Infectious Diseases and Preventive Medicine, Faculty of Veterinary Medicine, Banat’s University of Agricultural Sciences and Veterinary Medicine “King Michael I of Romania”, 300645 Timisoara, Romania
| | - Sundas Sharif
- Institute of Industrial Biotechnology, Government College University, Lahore 54000, Pakistan
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8
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Arendse M, Khan S, Wani MY, Aqlan FM, Al-Bogami AS, Ahmad A. Quorum Sensing and Biofilm Disrupting Potential of Imidazole Derivatives in Chromobacterium violaceum Using Antimicrobial and Drug Discovery Approaches. Braz J Microbiol 2022; 53:565-582. [PMID: 35301694 PMCID: PMC9151946 DOI: 10.1007/s42770-022-00702-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Accepted: 02/01/2022] [Indexed: 02/01/2023] Open
Abstract
Population of drug-resistant bacteria have increased at an alarming rate in the past few decades. The major reason for increasing drug resistance is the lack of new antibiotics and limited drug targets. It has therefore been a vital task to develop new antibiotics with different drug targets. Two such targets are biofilm formation and quorum sensing. Quorum sensing is cell to cell communication used by bacteria that initiates many important survival processes and aids in establishing pathogenesis. Both biofilm and quorum sensing are inter-related processes and play a major role in physiological and pathogenesis processes. In this study, five novel imidazole derivatives (IMA-1-IMA-5) were synthesised and tested for their antibacterial and anti-quorum sensing activities against Chromobacterium violaceum using different in silico and in vitro techniques following the standard protocols. In silico results revealed that all compounds were able to effectively bind to and interact sufficiently with the target protein CviR. CviR is a protein to which autoinducers bind to initiate the quorum sensing process. In silico results also revealed that the compounds generated favourable structural dynamics implying that the compounds would be able to effectively bind to CviR and inhibit quorum sensing. Susceptibility results revealed that IMA-1 is the most active of all the derivatives against both planktonic cells and biofilms. Qualitative and quantitative evaluation of anti-quorum sensing activity at sub-inhibitory concentrations of these compounds also revealed high activity for IMA-1. Down-regulation of most of the quorum sensing genes when cells were treated with the test compounds affirmed the high anti-quorum sensing activities of these compounds. The results from this study are promising and urges on the use of anti-quorum sensing and biofilm disrupting molecules to combat multi-drug resistance problem.
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Affiliation(s)
- Madison Arendse
- Clinical Microbiology and Infectious Diseases, School of Pathology, Health Sciences, University of the Witwatersrand, Johannesburg, 2193, South Africa
| | - Shama Khan
- Clinical Microbiology and Infectious Diseases, School of Pathology, Health Sciences, University of the Witwatersrand, Johannesburg, 2193, South Africa
| | - Mohmmad Younus Wani
- Department of Chemistry, College of Science, University of Jeddah, Jeddah, 21589, Kingdom of Saudi Arabia.
| | - Faisal Mohammed Aqlan
- Department of Chemistry, College of Science, University of Jeddah, Jeddah, 21589, Kingdom of Saudi Arabia
| | - Abdullah Saad Al-Bogami
- Department of Chemistry, College of Science, University of Jeddah, Jeddah, 21589, Kingdom of Saudi Arabia
| | - Aijaz Ahmad
- Clinical Microbiology and Infectious Diseases, School of Pathology, Health Sciences, University of the Witwatersrand, Johannesburg, 2193, South Africa. .,Infection Control, Charlotte Maxeke Johannesburg Academic Hospital, National Health Laboratory Service, Johannesburg, 2193, South Africa.
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9
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Abstract
Bacteria grow on surfaces in complex immobile communities known as biofilms, which are composed of cells embedded in an extracellular matrix. Within biofilms, bacteria often interact with members of their own species and cooperate or compete with members of other species via quorum sensing (QS). QS is a process by which microbes produce, secrete, and subsequently detect small molecules called autoinducers (AIs) to assess their local population density. We explore the competitive advantage of QS through agent-based simulations of a spatial model in which colony expansion via extracellular matrix production provides greater access to a limiting diffusible nutrient. We note a significant difference in results based on whether AI production is constitutive or limited by nutrient availability: If AI production is constitutive, simple QS-based matrix-production strategies can be far superior to any fixed strategy. However, if AI production is limited by nutrient availability, QS-based strategies fail to provide a significant advantage over fixed strategies. To explain this dichotomy, we derive a biophysical limit for the dynamic range of nutrient-limited AI concentrations in biofilms. This range is remarkably small (less than 10-fold) for the realistic case in which a growth-limiting diffusible nutrient is taken up within a narrow active growth layer. This biophysical limit implies that for QS to be most effective in biofilms AI production should be a protected function not directly tied to metabolism.
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10
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Díaz-Ríos C, Hernández M, Abad D, Álvarez-Montes L, Varsaki A, Iturbe D, Calvo J, Ocampo-Sosa AA. New Sequence Type ST3449 in Multidrug-Resistant Pseudomonas aeruginosa Isolates from a Cystic Fibrosis Patient. Antibiotics (Basel) 2021; 10:antibiotics10050491. [PMID: 33922748 PMCID: PMC8146123 DOI: 10.3390/antibiotics10050491] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 04/19/2021] [Accepted: 04/21/2021] [Indexed: 12/13/2022] Open
Abstract
Pseudomonas aeruginosa is one of the most critical bacterial pathogens associated with chronic infections in cystic fibrosis patients. Here we show the phenotypic and genotypic characterization of five consecutive multidrug-resistant isolates of P. aeruginosa collected during a month from a CF patient with end-stage lung disease and fatal outcome. The isolates exhibited distinct colony morphologies and pigmentation and differences in their capacity to produce biofilm and virulence potential evaluated in larvae of Galleria mellonella. Whole genome-sequencing showed that isolates belonged to a novel sequence type ST3449 and serotype O6. Analysis of their resistome demonstrated the presence of genes blaOXA-396, blaPAO, aph(3')-IIb, catB, crpP and fosA and new mutations in chromosomal genes conferring resistance to different antipseudomonal antibiotics. Genes exoS, exoT, exoY, toxA, lasI, rhlI and tse1 were among the 220 virulence genes detected. The different phenotypic and genotypic features found reveal the adaptation of clone ST3449 to the CF lung environment by a number of mutations affecting genes related with biofilm formation, quorum sensing and antimicrobial resistance. Most of these mutations are commonly found in CF isolates, which may give us important clues for future development of new drug targets to combat P. aeruginosa chronic infections.
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Affiliation(s)
- Catalina Díaz-Ríos
- Instituto de Investigación Sanitaria Marqués de Valdecilla (IDIVAL), 39011 Santander, Spain; (C.D.-R.); (L.Á.-M.)
| | - Marta Hernández
- Instituto Tecnológico Agrario de Castilla y León (ITACyL), 47071 Valladolid, Spain; (M.H.); (D.A.)
| | - David Abad
- Instituto Tecnológico Agrario de Castilla y León (ITACyL), 47071 Valladolid, Spain; (M.H.); (D.A.)
| | - Laura Álvarez-Montes
- Instituto de Investigación Sanitaria Marqués de Valdecilla (IDIVAL), 39011 Santander, Spain; (C.D.-R.); (L.Á.-M.)
| | - Athanasia Varsaki
- Centro de Investigación y Formación Agraria (CIFA), 39600 Muriedas, Spain;
| | - David Iturbe
- Servicio de Neumología, Hospital Universitario Marqués de Valdecilla, 39008 Santander, Spain;
| | - Jorge Calvo
- Servicio de Microbiología, Hospital Universitario Marqués de Valdecilla, 39008 Santander, Spain;
| | - Alain A. Ocampo-Sosa
- Instituto de Investigación Sanitaria Marqués de Valdecilla (IDIVAL), 39011 Santander, Spain; (C.D.-R.); (L.Á.-M.)
- Servicio de Microbiología, Hospital Universitario Marqués de Valdecilla, 39008 Santander, Spain;
- Correspondence:
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11
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Rodrigues AC, Almeida FAD, André C, Vanetti MCD, Pinto UM, Hassimotto NMA, Vieira ÉNR, Andrade NJD. Phenolic extract of Eugenia uniflora L. and furanone reduce biofilm formation by Serratia liquefaciens and increase its susceptibility to antimicrobials. BIOFOULING 2020; 36:1031-1048. [PMID: 33187450 DOI: 10.1080/08927014.2020.1844881] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 10/01/2020] [Accepted: 10/28/2020] [Indexed: 06/11/2023]
Abstract
Serratia liquefaciens is a spoilage microorganism of relevance in the dairy industry because it is psychrotrophic, able to form biofilm, and produces thermoresistant proteases and lipases. Phenolic compounds and furanones have been studied as inhibitors of biofilm formation. In this study, the potential of the pulp phenolic extract of Eugenia uniflora L. orange fruits, also called pitanga, and furanone C30 on the inhibition of biofilm formation by S. liquefaciens L53 and the susceptibility to different antimicrobials were evaluated. The pulp phenolic extract of pitanga had a high total phenolic content, being mainly composed of glycosylated quercetins and ellagitannins. Sub-inhibitory concentrations of this extract and furanone reduced biofilm formation by S. liquefaciens on polystyrene and the amount of polysaccharides, proteins and extracellular DNA in the biofilms. These biofilms were also more susceptible to kanamycin. The combinations of furanone with phenolic extract of pitanga or kanamycin showed a synergistic effect with total growth inhibition of S. liquefaciens.
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Affiliation(s)
| | - Felipe Alves de Almeida
- Department of Nutrition, Universidade Federal de Juiz de Fora, Governador Valadares, MG, Brazil
| | - Cleriane André
- Department of Nutrition, Centro Universitário Salesiano, Vitória, ES, Brazil
| | | | - Uelinton Manoel Pinto
- Food Research Center, Faculty of Pharmaceutical Sciences, Universidade de São Paulo, São Paulo, SP, Brazil
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12
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Yu Z, Zhang J, Ding M, Wu S, Shuangjia Li, Zhang M, Yin J, Meng Q. SspA positively controls exopolysaccharides production and biofilm formation by up-regulating the algU expression in Pseudoalteromonas sp. R3. Biochem Biophys Res Commun 2020; 533:988-994. [PMID: 33010891 DOI: 10.1016/j.bbrc.2020.09.118] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Accepted: 09/25/2020] [Indexed: 10/23/2022]
Abstract
Biofilm formation enhances the survival and persistence of microorganisms in response to environmental stresses. It has been revealed that stringent starvation protein A (SspA) can function as an important regulator dealing with environmental stresses for bacterial survival. However, the connection between SspA and biofilm formation is essentially unclear yet. In this study, we presented evidence showing SspA positively controls biofilm formation by up-regulating exopolysaccharides (EPS) production in marine bacterium Pseudoalteromonas sp. R3. Both qPCR and lacZ reporter system congruously revealed that SspA positively controls the expression of EPS biosynthesis gene cluster. Unlike generally accepted thought that SspA regulates bacterial physiology by inhibiting the expression of histone-like nucleotide structuring protein (H-NS) gene, the function of SspA on EPS production and biofilm formation in Pseudoalteromonas sp. R3 is H-NS-independent. Instead, SspA positively regulates the expression of sigma factor AlgU-encoding gene, thus affecting EPS biosynthesis and biofilm formation. In view of the important role of SspA in biofilm formation, we believe that the improvement of tolerance to marine environmental stresses could be related to tuning of SspA-involved biofilm formation.
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Affiliation(s)
- Zhiliang Yu
- College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, 310014, Zhejiang Province, China.
| | - Jiadi Zhang
- College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, 310014, Zhejiang Province, China
| | - Mengdan Ding
- College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, 310014, Zhejiang Province, China
| | - Shijun Wu
- College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, 310014, Zhejiang Province, China
| | - Shuangjia Li
- College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, 310014, Zhejiang Province, China
| | - Mengting Zhang
- College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, 310014, Zhejiang Province, China
| | - Jianhua Yin
- College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, 310014, Zhejiang Province, China
| | - Qiu Meng
- College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, 310014, Zhejiang Province, China.
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13
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Ramos-Vivas J, Chapartegui-González I, Fernández-Martínez M, González-Rico C, Barrett J, Fortún J, Escudero R, Marco F, Linares L, Nieto J, Aranzamendi M, Muñoz P, Valerio M, Aguado JM, Chaves F, Gracia-Ahufinger I, Paez-Vega A, Martínez-Martínez L, Fariñas MC. Adherence to Human Colon Cells by Multidrug Resistant Enterobacterales Strains Isolated From Solid Organ Transplant Recipients With a Focus on Citrobacter freundii. Front Cell Infect Microbiol 2020; 10:447. [PMID: 33042855 PMCID: PMC7525035 DOI: 10.3389/fcimb.2020.00447] [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: 05/08/2020] [Accepted: 07/21/2020] [Indexed: 12/13/2022] Open
Abstract
Enterobacteria species are common causes of hospital-acquired infections, which are associated with high morbidity and mortality rates. Immunocompromised patients such as solid organ transplant (SOT) recipients are especially at risk because they are frequently exposed to antibiotics in the course of their treatments. In this work, we used a collection of 106 Escherichia coli, 78 Klebsiella pneumoniae, 25 Enterobacter spp., and 24 Citrobacter spp. multidrug resistant strains isolated from transplant patients (hepatic, renal or renal/pancreatic) in order to examine their ability to adhere in vitro to HT-29 human colon cells, and to determine if some adhesive characteristics are associated with prevalence and persistence of these strains. A total of 33 E. coli (31%), 21 K. pneumoniae (27%), 7 Enterobacter spp. (28%), and 5 Citrobacter spp. (21%), adhered to the colon epithelial cells. Two main adherence patterns were observed in the four species analyzed, diffuse adherence, and aggregative adherence. Under transmission electronic microscopy (TEM), most bacteria lacked visible fimbria on their surface, despite their strong adherence to epithelial cells. None of the strains studied was able to induce any cytotoxic effect on HT-29 cells although some of them strongly colonizing both cells and glass coverslips at high density. Some of the strains failed to adhere to the epithelial cells but adhered strongly to the cover-slide, which shows that microscopy studies are mandatory to elucidate the adherence of bacteria to epithelial cells in vitro, and that quantitative assays using colony forming unit (CFUs) counting need to be supplemented with pictures to determine definitively if a bacterial strain adheres or not to animal cells in vitro. We report here, for the first time, the aggregative adherence pattern of two multidrug resistant (MDR) Citrobacter freundii strains isolated from human patients; importantly, biofilm formation in Citrobacter is totally dependent on the temperature; strong biofilms were formed at room temperature (RT) but not at 37°C, which can play an important role in the colonization of hospital surfaces. In conclusion, our results show that there is a great variety of adhesion phenotypes in multidrug-resistant strains that colonize transplanted patients.
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Affiliation(s)
| | | | - Marta Fernández-Martínez
- Instituto de Investigación Valdecilla-IDIVAL, Santander, Spain.,Service of Microbiology, Hospital Universitario Marqués de Valdecilla, Santander, Spain
| | - Claudia González-Rico
- Instituto de Investigación Valdecilla-IDIVAL, Santander, Spain.,Service of Infectious Diseases, Hospital Universitario Marqués de Valdecilla, Santander, Spain
| | - John Barrett
- Instituto de Investigación Valdecilla-IDIVAL, Santander, Spain.,New York University School of Medicine, New York, NY, United States
| | - Jesús Fortún
- Infectious Diseases Department, Hospital Universitario Ramón y Cajal, Madrid, Spain
| | - Rosa Escudero
- Infectious Diseases Department, Hospital Universitario Ramón y Cajal, Madrid, Spain
| | - Francesc Marco
- Service of Microbiology, Hospital Clínic-IDIBAPS, Universidad de Barcelona, Barcelona, Spain
| | - Laura Linares
- Infectious Diseases Service, Hospital Clínic-IDIBAPS, Universidad de Barcelona, Barcelona, Spain
| | - Javier Nieto
- Infectious Diseases Unit, Hospital Universitario de Cruces, Barakaldo, Spain
| | | | - Patricia Muñoz
- Clinical Microbiology and Infectious Diseases, Hospital General Universitario Gregorio Marañón, Madrid, Spain
| | - Maricela Valerio
- Clinical Microbiology and Infectious Diseases, Hospital General Universitario Gregorio Marañón, Madrid, Spain
| | - Jose María Aguado
- Infectious Diseases Unit, Hospital Universitario 12 de Octubre, Madrid, Spain
| | - Fernando Chaves
- Service of Microbiology, Hospital Universitario 12 de Octubre, Madrid, Spain
| | - Irene Gracia-Ahufinger
- Microbiology Unit, Hospital Universitario Reina Sofía, Córdoba, Spain.,Maimonides Biomedical Research Institute of Córdoba (IMIBIC), Córdoba, Spain.,Department of Microbiology, Universidad de Córdoba, Córdoba, Spain
| | - Aurora Paez-Vega
- Infectious Diseases Unit, Hospital Universitario Reina Sofía, Córdoba, Spain
| | - Luis Martínez-Martínez
- Microbiology Unit, Hospital Universitario Reina Sofía, Córdoba, Spain.,Maimonides Biomedical Research Institute of Córdoba (IMIBIC), Córdoba, Spain.,Department of Microbiology, Universidad de Córdoba, Córdoba, Spain
| | - María Carmen Fariñas
- Instituto de Investigación Valdecilla-IDIVAL, Santander, Spain.,Service of Infectious Diseases, Hospital Universitario Marqués de Valdecilla, Santander, Spain
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14
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Microbial biofilm ecology, in silico study of quorum sensing receptor-ligand interactions and biofilm mediated bioremediation. Arch Microbiol 2020; 203:13-30. [PMID: 32785735 DOI: 10.1007/s00203-020-02012-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 07/17/2020] [Accepted: 08/04/2020] [Indexed: 12/15/2022]
Abstract
Biofilms are structured microbial communities of single or multiple populations in which microbial cells adhere to a surface and get embedded in extracellular polymeric substances (EPS). This review attempts to explain biofilm architecture, development phases, and forces that drive bacteria to promote biofilm mode of growth. Bacterial chemical communication, also known as Quorum sensing (QS), which involves the production, detection, and response to small molecules called autoinducers, is highlighted. The review also provides a brief outline of interspecies and intraspecies cell-cell communication. Additionally, we have performed docking studies using Discovery Studio 4.0, which has enabled our understanding of the prominent interactions between autoinducers and their receptors in different bacterial species while also scoring their interaction energies. Receptors, such as LuxN (Phosphoreceiver domain and RecA domain), LuxP, and LuxR, interacted with their ligands (AI-1, AI-2, and AHL) with a CDocker interaction energy of - 31.6083 kcal/mole; - 34.5821 kcal/mole, - 48.2226 kcal/mole and - 41.5885 kcal/mole, respectively. Since biofilms are ideal for the remediation of contaminants due to their high microbial biomass and their potential to immobilize pollutants, this article also provides an overview of biofilm-mediated bioremediation.
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15
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Kpi, a chaperone-usher pili system associated with the worldwide-disseminated high-risk clone Klebsiella pneumoniae ST-15. Proc Natl Acad Sci U S A 2020; 117:17249-17259. [PMID: 32641516 PMCID: PMC7382220 DOI: 10.1073/pnas.1921393117] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Control of infections caused by carbapenem-resistant Klebsiella pneumoniae continues to be challenging. The success of this pathogen is favored by its ability to acquire antimicrobial resistance and to spread and persist in both the environment and in humans. The emergence of clinically important clones, such as sequence types 11, 15, 101, and 258, has been reported worldwide. However, the mechanisms promoting the dissemination of such high-risk clones are unknown. Unraveling the factors that play a role in the pathobiology and epidemicity of K. pneumoniae is therefore important for managing infections. To address this issue, we studied a carbapenem-resistant ST-15 K. pneumoniae isolate (Kp3380) that displayed a remarkable adherent phenotype with abundant pilus-like structures. Genome sequencing enabled us to identify a chaperone-usher pili system (Kpi) in Kp3380. Analysis of a large K. pneumoniae population from 32 European countries showed that the Kpi system is associated with the ST-15 clone. Phylogenetic analysis of the operon revealed that Kpi belongs to the little-characterized γ2-fimbrial clade. We demonstrate that Kpi contributes positively to the ability of K. pneumoniae to form biofilms and adhere to different host tissues. Moreover, the in vivo intestinal colonizing capacity of the Kpi-defective mutant was significantly reduced, as was its ability to infect Galleria mellonella The findings provide information about the pathobiology and epidemicity of Kpi+ K. pneumoniae and indicate that the presence of Kpi may explain the success of the ST-15 clone. Disrupting bacterial adherence to the intestinal surface could potentially target gastrointestinal colonization.
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16
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Li Q, Wu Y, Wang J, Yang B, Chen J, Wu H, Zhang Z, Lu C, Lin W, Wu L. Linking Short-Chain N-Acyl Homoserine Lactone-Mediated Quorum Sensing and Replant Disease: A Case Study of Rehmannia glutinosa. FRONTIERS IN PLANT SCIENCE 2020; 11:787. [PMID: 32625222 PMCID: PMC7311668 DOI: 10.3389/fpls.2020.00787] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2020] [Accepted: 05/18/2020] [Indexed: 06/11/2023]
Abstract
Rehmannia glutinosa, a perennial medicinal plant, suffers from severe replant disease under consecutive monoculture. The rhizosphere microbiome is vital for soil suppressiveness to diseases and for plant health. Moreover, N-acyl homoserine lactone (AHL)-mediated quorum sensing (QS) regulates diverse behavior in rhizosphere-inhabiting and plant pathogenic bacteria. The dynamics of short-chain AHL-mediated QS bacteria driven by consecutive monoculture and its relationships with R. glutinosa replant disease were explored in this study. The screening of QS bacteria showed that 65 out of 200 strains (32.5%) randomly selected from newly planted soil of R. glutinosa were detected as QS bacteria, mainly consisting of Pseudomonas spp. (55.4%). By contrast, 34 out of 200 (17%) strains from the diseased replant soil were detected as QS bacteria, mainly consisting of Enterobacteriaceae (73.5%). Functional analysis showed most of the QS bacteria belonging to the Pseudomonas genus showed strong antagonistic activities against Fusarium oxysporum or Aspergillus flavus, two main causal agents of R. glutinosa root rot disease. However, the QS strains dominant in the replant soil caused severe wilt disease in the tissue culture seedlings of R. glutinosa. Microbial growth assays demonstrated a concentration-dependent inhibitory effect on the growth of beneficial QS bacteria (i.e., Pseudomonas brassicacearum) by a phenolic acid mixture identified in the root exudates of R. glutinosa, but the opposite was true for harmful QS bacteria (i.e., Enterobacter spp.). Furthermore, it was found that the population of quorum quenching (QQ) bacteria that could disrupt the beneficial P. brassicacearum SZ50 QS system was significantly higher in the replant soil than in the newly planted soil. Most of these QQ bacteria in the replant soil were detected as Acinetobacter spp. The growth of specific QQ bacteria could be promoted by a phenolic acid mixture at a ratio similar to that found in the R. glutinosa rhizosphere. Moreover, these quorum-quenching bacteria showed strong pathogenicity toward the tissue culture seedlings of R. glutinosa. In conclusion, consecutive monoculture of R. glutinosa contributed to the imbalance between beneficial and harmful short-chain AHL-mediated QS bacteria in the rhizosphere, which was mediated not only by specific root exudates but also by the QQ bacterial community.
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Affiliation(s)
- Qian Li
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Laboratory of Crop Ecology and Molecular Physiology, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Yanhong Wu
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Laboratory of Crop Ecology and Molecular Physiology, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Juanying Wang
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Laboratory of Crop Ecology and Molecular Physiology, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Bo Yang
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Laboratory of Crop Ecology and Molecular Physiology, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Jun Chen
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Laboratory of Crop Ecology and Molecular Physiology, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Hongmiao Wu
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Laboratory of Crop Ecology and Molecular Physiology, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Zhongyi Zhang
- College of Crop Science, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Cuihong Lu
- Wenxian Institute of Agricultural Sciences, Jiaozuo, China
| | - Wenxiong Lin
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
- Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Linkun Wu
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Laboratory of Crop Ecology and Molecular Physiology, Fujian Agriculture and Forestry University, Fuzhou, China
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17
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Radulović O, Stanković S, Uzelac B, Tadić V, Trifunović-Momčilov M, Lozo J, Marković M. Phenol Removal Capacity of the Common Duckweed ( Lemna minor L.) and Six Phenol-Resistant Bacterial Strains From Its Rhizosphere: In Vitro Evaluation at High Phenol Concentrations. PLANTS 2020; 9:plants9050599. [PMID: 32397144 PMCID: PMC7285011 DOI: 10.3390/plants9050599] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 04/26/2020] [Accepted: 04/28/2020] [Indexed: 02/07/2023]
Abstract
The main topic of this study is the bioremediation potential of the common duckweed, Lemna minor L., and selected rhizospheric bacterial strains in removing phenol from aqueous environments at extremely high initial phenol concentrations. To that end, fluorescence microscopy, MIC tests, biofilm formation, the phenol removal test (4-AAP method), the Salkowski essay, and studies of multiplication rates of sterile and inoculated duckweed in MS medium with phenol (200, 500, 750, and 1000 mg L−1) were conducted. Out of seven bacterial strains, six were identified as epiphytes or endophytes that efficiently removed phenol. The phenol removal experiment showed that the bacteria/duckweed system was more efficient during the first 24 h compared to the sterile duckweed control group. At the end of this experiment, almost 90% of the initial phenol concentration was removed by both groups, respectively. The bacteria stimulated the duckweed multiplication even at a high bacterial population density (>105 CFU mL−1) over a prolonged period of time (14 days). All bacterial strains were sensitive to all the applied antibiotics and formed biofilms in vitro. The dual bacteria/duckweed system, especially the one containing strain 43-Hafnia paralvei C32-106/3, Accession No. MF526939, had a number of characteristics that are advantageous in bioremediation, such as high phenol removal efficiency, biofilm formation, safety (antibiotic sensitivity), and stimulation of duckweed multiplication.
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Affiliation(s)
- Olga Radulović
- Department of Plant Physiology, Institute for Biological Research “Siniša Stanković”–National Institute of the Republic of Serbia, University of Belgrade, 142 Bulevar Despota Stefana, Belgrade 11060, Serbia; (B.U.); (M.T-M.); (M.M.)
- Correspondence:
| | - Slaviša Stanković
- Faculty of Biology, University of Belgrade, 16 Studentski Trg, Belgrade 11000, Serbia; (S.S.); (J.L.)
| | - Branka Uzelac
- Department of Plant Physiology, Institute for Biological Research “Siniša Stanković”–National Institute of the Republic of Serbia, University of Belgrade, 142 Bulevar Despota Stefana, Belgrade 11060, Serbia; (B.U.); (M.T-M.); (M.M.)
| | - Vojin Tadić
- Mining and Metallurgy Institute Bor, 35 Zeleni Bulevar, Bor 19210, Serbia;
| | - Milana Trifunović-Momčilov
- Department of Plant Physiology, Institute for Biological Research “Siniša Stanković”–National Institute of the Republic of Serbia, University of Belgrade, 142 Bulevar Despota Stefana, Belgrade 11060, Serbia; (B.U.); (M.T-M.); (M.M.)
| | - Jelena Lozo
- Faculty of Biology, University of Belgrade, 16 Studentski Trg, Belgrade 11000, Serbia; (S.S.); (J.L.)
| | - Marija Marković
- Department of Plant Physiology, Institute for Biological Research “Siniša Stanković”–National Institute of the Republic of Serbia, University of Belgrade, 142 Bulevar Despota Stefana, Belgrade 11060, Serbia; (B.U.); (M.T-M.); (M.M.)
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18
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An α/β-Hydrolase Fold Subfamily Comprising Pseudomonas Quinolone Signal-Cleaving Dioxygenases. Appl Environ Microbiol 2020; 86:AEM.00279-20. [PMID: 32086305 DOI: 10.1128/aem.00279-20] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Accepted: 02/12/2020] [Indexed: 01/25/2023] Open
Abstract
The quinolone ring is a common core structure of natural products exhibiting antimicrobial, cytotoxic, and signaling activities. A prominent example is the Pseudomonas quinolone signal (PQS), a quorum-sensing signal molecule involved in the regulation of virulence of Pseudomonas aeruginosa The key reaction to quinolone inactivation and biodegradation is the cleavage of the 3-hydroxy-4(1H)-quinolone ring, catalyzed by dioxygenases (HQDs), which are members of the α/β-hydrolase fold superfamily. The α/β-hydrolase fold core domain consists of a β-sheet surrounded by α-helices, with an active site usually containing a catalytic triad comprising a nucleophilic residue, an acidic residue, and a histidine. The nucleophile is located at the tip of a sharp turn, called the "nucleophilic elbow." In this work, we developed a search workflow for the identification of HQD proteins from databases. Search and validation criteria include an [H-x(2)-W] motif at the nucleophilic elbow, an [HFP-x(4)-P] motif comprising the catalytic histidine, the presence of a helical cap domain, the positioning of the triad's acidic residue at the end of β-strand 6, and a set of conserved hydrophobic residues contributing to the substrate cavity. The 161 candidate proteins identified from the UniProtKB database originate from environmental and plant-associated microorganisms from all domains of life. Verification and characterization of HQD activity of 9 new candidate proteins confirmed the reliability of the search strategy and suggested residues correlating with distinct substrate preferences. Among the new HQDs, PQS dioxygenases from Nocardia farcinica, N. cyriacigeorgica, and Streptomyces bingchenggensis likely are part of a catabolic pathway for alkylquinolone utilization.IMPORTANCE Functional annotation of protein sequences is a major requirement for the investigation of metabolic pathways and the identification of sought-after biocatalysts. To identify heterocyclic ring-cleaving dioxygenases within the huge superfamily of α/β-hydrolase fold proteins, we defined search and validation criteria for the primarily motif-based identification of 3-hydroxy-4(1H)-quinolone 2,4-dioxygenases (HQD). HQDs are key enzymes for the inactivation of metabolites, which can have signaling, antimicrobial, or cytotoxic functions. The HQD candidates detected in this study occur particularly in environmental and plant-associated microorganisms. Because HQDs active toward the Pseudomonas quinolone signal (PQS) likely contribute to interactions within microbial communities and modulate the virulence of Pseudomonas aeruginosa, we analyzed the catalytic properties of a PQS-cleaving subset of HQDs and specified characteristics to identify PQS-cleaving dioxygenases within the HQD family.
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19
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Ramos-Vivas J, Chapartegui-González I, Fernández-Martínez M, González-Rico C, Fortún J, Escudero R, Marco F, Linares L, Montejo M, Aranzamendi M, Muñoz P, Valerio M, Aguado JM, Resino E, Ahufinger IG, Vega AP, Martínez-Martínez L, Fariñas MC. Biofilm formation by multidrug resistant Enterobacteriaceae strains isolated from solid organ transplant recipients. Sci Rep 2019; 9:8928. [PMID: 31222089 PMCID: PMC6586660 DOI: 10.1038/s41598-019-45060-y] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Accepted: 05/29/2019] [Indexed: 11/09/2022] Open
Abstract
Solid organ transplant (SOT) recipients are especially at risk of developing infections by multidrug resistant bacteria (MDR). In this study, the biofilm-forming capability of 209 MDR strains (Escherichia coli n = 106, Klebsiella pneumoniae n = 78, and Enterobacter spp. n = 25) isolated from rectal swabs in the first 48 hours before or after kidney (93 patients), liver (60 patients) or kidney/pancreas transplants (5 patients) were evaluated by using a microplate assay. Thirty-nine strains were isolated before transplant and 170 strains were isolated post-transplant. Overall, 16% of E. coli strains, 73% of K. pneumoniae strains and 4% Enterobacter strains showed moderate or strong biofilm production. Nine strains isolated from infection sites after transplantation were responsible of infections in the first month. Of these, 4 K. pneumoniae, 1 E. coli and 1 Enterobacter spp. strains isolated pre-transplant or post-transplant as colonizers caused infections in the post-transplant period. Our results suggest that in vitro biofilm formation could be an important factor for adhesion to intestine and colonization in MDR K. pneumoniae strains in SOT recipients, but this factor appears to be less important for MDR E. coli and Enterobacter spp.
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Affiliation(s)
- José Ramos-Vivas
- Instituto de Investigación Valdecilla-IDIVAL, Avd. Cardenal Herrera Oria, 39011, Santander, Spain
| | | | - Marta Fernández-Martínez
- Service of Microbiology, Hospital Universitario Marqués de Valdecilla, Avd. Valdecilla, 39008, Santander, Spain
| | - Claudia González-Rico
- Infectious Diseases Unit. Hospital Universitario Marqués de Valdecilla, Santander, Spain. Avd. Valdecilla, 39008, Santander, Spain
| | - Jesús Fortún
- Infectious Diseases Department, Hospital Universitario Ramón y Cajal, Ctra. Colmenar Viejo, km. 9, 100, 28034, Madrid, Spain
| | - Rosa Escudero
- Infectious Diseases Department, Hospital Universitario Ramón y Cajal, Ctra. Colmenar Viejo, km. 9, 100, 28034, Madrid, Spain
| | - Francesc Marco
- Service of Microbiology, Hospital Clínic-IDIBAPS, Universidad de Barcelona, Carrer de Villarroel, 170, 08036, Barcelona, Spain
| | - Laura Linares
- Infectious Diseases Service, Hospital Clínic-IDIBAPS, Universidad de Barcelona, Carrer de Villarroel, 170, 08036, Barcelona, Spain
| | - Miguel Montejo
- Infectious Diseases Unit, Hospital Universitario Cruces, Plaza de Cruces, S/N, 48903, Baracaldo, Vizcaya, Spain
| | - Maitane Aranzamendi
- Service of Microbiology, Hospital Universitario Cruces, Plaza de Cruces, S/N, 48903, Baracaldo, Vizcaya, Spain
| | - Patricia Muñoz
- Clinical Microbiology and Infectious Diseases, Hospital General Universitario Gregorio Marañón, Calle del Dr. Esquerdo, 46, 28007, Madrid, Spain
| | - Maricela Valerio
- Clinical Microbiology and Infectious Diseases, Hospital General Universitario Gregorio Marañón, Calle del Dr. Esquerdo, 46, 28007, Madrid, Spain
| | - Jose María Aguado
- Infectious Diseases Unit, Hospital Universitario 12 de Octubre, Av. Córdoba, s/n, 28004, Madrid, Spain
| | - Elena Resino
- Infectious Diseases Unit, Hospital Universitario 12 de Octubre, Av. Córdoba, s/n, 28004, Madrid, Spain
| | - Irene Gracia Ahufinger
- Service of Microbiology, Hospital Universitario Reina Sofía, Av. Menéndez Pidal, s/n, 14004, Córdoba, Spain
| | - Aurora Paz Vega
- Infectious Diseases Unit, Hospital Universitario Reina Sofía, Av. Menéndez Pidal, s/n, 14004, Córdoba, Spain
| | - Luis Martínez-Martínez
- Service of Microbiology, Hospital Universitario Marqués de Valdecilla, Avd. Valdecilla, 39008, Santander, Spain.,Service of Microbiology, Hospital Universitario Reina Sofía, Av. Menéndez Pidal, s/n, 14004, Córdoba, Spain
| | - María Carmen Fariñas
- Instituto de Investigación Valdecilla-IDIVAL, Avd. Cardenal Herrera Oria, 39011, Santander, Spain. .,Infectious Diseases Unit. Hospital Universitario Marqués de Valdecilla, Santander, Spain. Avd. Valdecilla, 39008, Santander, Spain.
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Rivera MLC, Hassimotto NMA, Bueris V, Sircili MP, de Almeida FA, Pinto UM. Effect of Capsicum Frutescens Extract, Capsaicin, and Luteolin on Quorum Sensing Regulated Phenotypes. J Food Sci 2019; 84:1477-1486. [PMID: 31132155 DOI: 10.1111/1750-3841.14648] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2018] [Revised: 04/09/2019] [Accepted: 04/12/2019] [Indexed: 01/04/2023]
Abstract
Capsicum peppers have not been investigated as sources of quorum sensing (QS) inhibitors. This study aimed to identify compounds in pimenta-malagueta (Capsicum frutescens) and red pepper (Capsicum annuum) extracts and to evaluate their effect on violacein production in Chromobacterium violaceum ATCC 12472 and C. violaceum CV026, as well as biofilm formation (BF) in Pseudomonas aeruginosa PAO1 and Serratia marcescens MG1. Among the extracts, pimenta-malagueta methanolic extract (PMME) was chosen because it contained capsaicin, dihydrocapsaicin, and luteolin in greater amount than the other extracts. In general, PMME partially inhibited bacterial growth at 2.5 and 5.0 mg/mL, as well as capsaicin at 100 µg/mL and luteolin at 62.5, 125, and 250 µg/mL. At lower concentrations, PMME and luteolin reduced violacein production in C. violaceum ATCC 12472 without affecting growth, a result that was not observed with capsaicin. We show that violacein inhibition by PMME is likely due to luteolin. In silico docking evaluation showed that luteolin binds to the CviR QS regulator. Crystal violet staining and confocal microscopy revealed that BF was increased by PMME and capsaicin, being remarkably superior for P. aeruginosa PAO1 at 30 °C. Capsaicin is not an effective QS inhibitor, while luteolin should be further investigated for its potential effects in QS regulated phenotypes. PRACTICAL APPLICATION: Quorum sensing (QS) is a form of bacterial communication targeted for studies aiming to inhibit bacterial virulence. QS regulates phenotypes that influence microbial activities across many areas, including Food Science. Capsicum frutescens is a type of chili pepper consumed in Brazil, rich in bioactive compounds such as capsaicin (which gives its pungency) and luteolin (a phenolic compound). We show that C. frutescens extract and luteolin inhibit QS in a model bacterium, along with the possible molecular mechanism of inhibition. Capsaicin did not inhibit QS neither biofilm formation. Luteolin should be further investigated for its QS inhibition properties and biotechnological applications.
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Affiliation(s)
- Milagros Liseth Castillo Rivera
- Food Research Center, Dept. of Food and Experimental Nutrition, Faculty of Pharmaceutical Sciences, Univ. of Sao Paulo, Av. Prof. Lineu Prestes 580, B.14, 05508-000, Sao Paulo, Brazil
| | - Neuza Mariko Aymoto Hassimotto
- Food Research Center, Dept. of Food and Experimental Nutrition, Faculty of Pharmaceutical Sciences, Univ. of Sao Paulo, Av. Prof. Lineu Prestes 580, B.14, 05508-000, Sao Paulo, Brazil
| | - Vanessa Bueris
- Laboratory of Resistome and Therapeutic Alternatives, Inst. of Biomedical Sciences , Univ. of Sao Paulo, Av. Prof. Lineu Prestes 2415, 05508-900, Sao Paulo, Brazil.,Laboratory of Genetics, Butantan Institute, Av. Vital Brasil 1500, 05503-900, Sao Paulo, Brazil
| | - Marcelo Palma Sircili
- Laboratory of Genetics, Butantan Institute, Av. Vital Brasil 1500, 05503-900, Sao Paulo, Brazil
| | - Felipe Alves de Almeida
- Dept. of Nutrition, Federal Univ. of Juiz de Fora, Rua Manoel Byrro 241, 35032-620, Governador Valadares, Brazil
| | - Uelinton Manoel Pinto
- Food Research Center, Dept. of Food and Experimental Nutrition, Faculty of Pharmaceutical Sciences, Univ. of Sao Paulo, Av. Prof. Lineu Prestes 580, B.14, 05508-000, Sao Paulo, Brazil
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21
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Zhu J, Yan Y, Wang Y, Qu D. Competitive interaction on dual-species biofilm formation by spoilage bacteria, Shewanella baltica and Pseudomonas fluorescens. J Appl Microbiol 2019; 126:1175-1186. [PMID: 30592126 DOI: 10.1111/jam.14187] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Revised: 12/04/2018] [Accepted: 12/20/2018] [Indexed: 12/18/2022]
Abstract
AIMS This study aims to characterize the biofilm produced by mono- and dual-species of Shewanella baltica and Pseudomonas fluorescens as fish spoilers at the different incubation temperature, and to elucidate the interactive behaviour of dual-species biofilm development. METHODS AND RESULTS The mono- and dual-species biofilm formation and adhesion characteristics of S. baltica and P. fluorescens were evaluated by using crystal violet staining, scanning electron microscopy and confocal laser scanning microscopy. Results showed that P. fluorescens had significantly higher biofilm biomass and polysaccharides production than S. baltica, and two isolates reached the maximum biofilm biomass during the early stationary phase. Lower biomass and polysaccharides in dual-species biofilms were observed compared to mono-species of P. fluorescens. Meanwhile, S. baltica and P. fluorescens formed fragile and viscous pellicles with different spatial architectures respectively. In dual-species pellicle few large microcolonies were dominated by P. fluorescens. Compared to mono-species of PF07, adherent cell population and biofilm thickness at the developing phase significantly decreased, and biofilm-forming cycle prolonged in the dual-species biofilms. Biofilm formation and adhesion of mono- and dual-species at 4 or 15°C were significantly higher than at 30°C during the same phase. The culture supernatant extracts of the two spoilage strains greatly inhibited biofilm development to each other. CONCLUSIONS Shewanella baltica and P. fluorescens had different biofilm and pellicle characteristics, and the inhibitory development on dual-species biofilm was associated with the competitive interaction by the two psychrotrophic spoilage bacteria. SIGNIFICANCE AND IMPACT OF THE STUDY This work contributes to a better understanding of interactive behaviour of multispecies biofilm communities by psychrotrophic spoilage bacteria at low temperature, which could contribute to further control contamination of spoilage organism during the preservation and processing of aquatic products.
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Affiliation(s)
- J Zhu
- College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, Zhejiang Province, China
| | - Y Yan
- College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, Zhejiang Province, China
| | - Y Wang
- College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, Zhejiang Province, China
| | - D Qu
- Department of Medical Microbiology and Parasitology, Key Laboratory of Medical Molecular Virology of Ministries of Education and Health, School of Basic Medical Sciences, Fudan University, Shanghai, China
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22
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Characterization of LuxI/LuxR and their regulation involved in biofilm formation and stress resistance in fish spoilers Pseudomonas fluorescens. Int J Food Microbiol 2018; 297:60-71. [PMID: 30884254 DOI: 10.1016/j.ijfoodmicro.2018.12.011] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Revised: 12/11/2018] [Accepted: 12/13/2018] [Indexed: 12/22/2022]
Abstract
Quorum sensing (QS) is crucial for adaption and development of foodborne bacteria in diverse environments. Pseudomonas fluorescens PF07 with QS mediated acylated homoserine lactones (AHLs) activity was isolated from spoiled large yellow croaker (Pseudosciaena crocea). In this study AHL-mediated QS system was characterized and their roles in biofilm formation, motility, stress response and spoilage of P. fluorescens were evaluated. A LuxI/LuxR homolog consisting of a conserved AHL synthase gene (luxI) and a transcriptional regulator gene (luxR) was identified in the strain. Two in-frame deletion mutants of luxI and luxR, ∆luxI and ∆luxR, were constructed to explore their QS signaling function in P. fluorescens. Three types of AHLs were detected in PF07 culture by LC-MS/MS, and N-butanoyl-l-homoserine lactone (C4-HSL) was a major signal molecule. The C4-HSL activities was almost abolished in ∆luxI, and decreased greatly in ∆luxR. Compared with wild type (WT) strain, both ∆luxI and ∆luxR showed the significant decrease of biofilm biomass and expolysaccharide production, resulting in thinner and incompact biofilm structure, but promoted swimming motility. The resistance of P. fluorescens to H2O2, heat, NaCl and crystal violet apparently declined in two mutants compared to WT. Spoilage factors, siderophore and protease, apparently attenuated due to deletion of luxI or luxR gene, while the growth and TVB-N production did not differ. Furthermore, the changes of the biofilm formation, motility and protease in ∆luxI strain were partially restored by the exogenous C4-HSL. In agreement with the effect of two mutants on various phenotypes, the transcriptions of alg, lapA, flgA, rpoS, and aprX were significantly down-regulated, and flgA was up-regulated in ∆luxI and ∆luxR. Therefore, the present study highlighted that the co-operation of LuxI/LuxR homolog was an important QS regulator in biofilm formation, motility and spoilage potential, and hinted its positive regulation of stress resistance with RpoS in P. fluorescens.
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23
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Mayer C, Muras A, Romero M, López M, Tomás M, Otero A. Multiple Quorum Quenching Enzymes Are Active in the Nosocomial Pathogen Acinetobacter baumannii ATCC17978. Front Cell Infect Microbiol 2018; 8:310. [PMID: 30271754 PMCID: PMC6146095 DOI: 10.3389/fcimb.2018.00310] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Accepted: 08/14/2018] [Indexed: 12/24/2022] Open
Abstract
Acinetobacter baumannii presents a typical luxI/luxR quorum sensing (QS) system (abaI/abaR) but the acyl-homoserine lactone (AHL) signal profile and factors controlling the production of QS signals in this species have not been determined yet. A very complex AHL profile was identified for A. baumannii ATCC17978 as well as for A. nosocomialis M2, but only when cultivated under static conditions, suggesting that surface or cell-to-cell contact is involved in the activation of the QS genes. The analysis of A. baumanni clinical isolates revealed a strain-specific AHL profile that was also affected by nutrient availability. The concentration of OHC12-HSL, the major AHL found in A. baumannii ATCC17978, peaked upon stationary-phase establishment and decreases steeply afterwards. Quorum quenching (QQ) activity was found in the cell extracts of A. baumannii ATCC17978, correlating with the disappearance of the AHLs from the culture media, indicating that AHL concentration may be self-regulated in this pathogen. Since QQ activity was observed in strains in which AidA, a novel α/β-hydrolase recently identified in A. baumannii, is not present, we have searched for additional QQ enzymes in A. baumannii ATCC17978. Seven putative AHL-lactonase sequences could be identified in the genome and the QQ activity of 3 of them could be confirmed. At least six of these lactonase sequences are also present in all clinical isolates as well as in A. nosocomialis M2. Surface-associated motility and biofilm formation could be blocked by the exogenous addition of the wide spectrum QQ enzyme Aii20J. The differential regulation of the QQ enzymes in A. baumannii ATCC17978 and the full dependence of important virulence factors on the QS system provides a strong evidence of the importance of the AHL-mediated QS/QQ network in this species.
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Affiliation(s)
- Celia Mayer
- Department of Microbiology and Parasitology, Faculty of Biology-CIBUS, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| | - Andrea Muras
- Department of Microbiology and Parasitology, Faculty of Biology-CIBUS, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| | - Manuel Romero
- Department of Microbiology and Parasitology, Faculty of Biology-CIBUS, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| | - María López
- Department of Microbiology, Complejo Hospitalario Universitario A Coruña-INIBIC, A Coruña Spain
| | - María Tomás
- Department of Microbiology, Complejo Hospitalario Universitario A Coruña-INIBIC, A Coruña Spain
| | - Ana Otero
- Department of Microbiology and Parasitology, Faculty of Biology-CIBUS, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
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Chapartegui-González I, Lázaro-Díez M, Bravo Z, Navas J, Icardo JM, Ramos-Vivas J. Acinetobacter baumannii maintains its virulence after long-time starvation. PLoS One 2018; 13:e0201961. [PMID: 30133491 PMCID: PMC6104976 DOI: 10.1371/journal.pone.0201961] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Accepted: 07/25/2018] [Indexed: 12/12/2022] Open
Abstract
Acinetobacter baumannii is a cause of healthcare-associated infections. Although A. baumannii is an opportunistic pathogen, its infections are notoriously difficult to treat due to intrinsic and acquired antimicrobial resistance, often limiting effective therapeutic options. A. baumannii can survive for long periods in the hospital environment, particularly on inanimate surfaces. Such environments may act as a reservoir for cross-colonization and infection outbreaks and should be considered a substantial factor in infection control practices. Moreover, clothing of healthcare personnel and gadgets may play a role in the spread of nosocomial bacteria. A link between contamination of hospital surfaces and A. baumannii infections or between its persistence in the environment and its virulence has not yet been established. Bacteria under stress (i.e., long-term desiccation in hospital setting) could conserve factors that favor infection. To investigate whether desiccation and/or starvation may be involved in the ability of certain strains of A. baumannii to retain virulence factors, we have studied five well-characterized clinical isolates of A. baumannii for which survival times were determined under simulated hospital conditions. Despite a considerable reduction in the culturability over time (up to 88% depending on strain and the condition tested), some A. baumannii strains were able to maintain their ability to form biofilms after rehydration, addition of nutrients, and changing temperature. Also, after long-term desiccation, several clinical strains were able to grow in the presence of non-immune human serum as fine as their non-stressed homologs. Furthermore, we also show that the ability of bacterial strains to kill Galleria mellonella larvae does not change although A. baumannii cells were stressed by long-term starvation (up to 60 days). This means that A. baumannii can undergo a rapid adaptation to both the temperature shift and nutrients availability, conditions that can be easily found by bacteria in a new patient in the hospital setting.
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Affiliation(s)
- Itziar Chapartegui-González
- Instituto de Investigación Valdecilla IDIVAL, Santander, Spain
- Servicio de Microbiología, Hospital Universitario Marqués de Valdecilla, Santander, Spain
| | - María Lázaro-Díez
- Instituto de Investigación Valdecilla IDIVAL, Santander, Spain
- Servicio de Microbiología, Hospital Universitario Marqués de Valdecilla, Santander, Spain
- Red Española de Investigación en Patología Infecciosa (REIPI), Instituto de Salud Carlos III, Madrid, Spain
| | - Zaloa Bravo
- Instituto de Investigación Valdecilla IDIVAL, Santander, Spain
| | - Jesús Navas
- Instituto de Investigación Valdecilla IDIVAL, Santander, Spain
- Departamento de Biología Molecular, Universidad de Cantabria, Santander, Spain
| | - José M. Icardo
- Departamento de Anatomía y Biología Celular, Universidad de Cantabria, Santander, Spain
| | - José Ramos-Vivas
- Instituto de Investigación Valdecilla IDIVAL, Santander, Spain
- Servicio de Microbiología, Hospital Universitario Marqués de Valdecilla, Santander, Spain
- Red Española de Investigación en Patología Infecciosa (REIPI), Instituto de Salud Carlos III, Madrid, Spain
- * E-mail:
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25
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A novel screen-printed mast cell-based electrochemical sensor for detecting spoilage bacterial quorum signaling molecules (N-acyl-homoserine-lactones) in freshwater fish. Biosens Bioelectron 2018; 102:396-402. [DOI: 10.1016/j.bios.2017.11.040] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Revised: 10/23/2017] [Accepted: 11/10/2017] [Indexed: 12/30/2022]
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26
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Bifunctional quorum-quenching and antibiotic-acylase MacQ forms a 170-kDa capsule-shaped molecule containing spacer polypeptides. Sci Rep 2017; 7:8946. [PMID: 28827579 PMCID: PMC5566955 DOI: 10.1038/s41598-017-09399-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Accepted: 07/26/2017] [Indexed: 12/18/2022] Open
Abstract
Understanding the molecular mechanisms of bacterial antibiotic resistance will help prepare against further emergence of multi-drug resistant strains. MacQ is an enzyme responsible for the multi-drug resistance of Acidovorax sp. strain MR-S7. MacQ has acylase activity against both N-acylhomoserine lactones (AHLs), a class of signalling compounds involved in quorum sensing, and β-lactam antibiotics. Thus, MacQ is crucial as a quencher of quorum sensing as well as in conferring antibiotic resistance in Acidovorax. Here, we report the X-ray structures of MacQ in ligand-free and reaction product complexes. MacQ forms a 170-kDa capsule-shaped molecule via face-to-face interaction with two heterodimers consisting of an α-chain and a β-chain, generated by the self-cleaving activity of a precursor polypeptide. The electron density of the spacer polypeptide in the hollow of the molecule revealed the close orientation of the peptide-bond atoms of Val20SP-Gly21SP to the active-site, implying a role of the residues in substrate binding. In mutational analyses, uncleaved MacQ retained degradation activity against both AHLs and penicillin G. These results provide novel insights into the mechanism of self-cleaving maturation and enzymatic function of N-terminal nucleophile hydrolases.
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27
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Bravo Z, Chapartegui-González I, Lázaro-Díez M, Ramos-Vivas J. Acinetobacter pittii biofilm formation on inanimate surfaces after long-term desiccation. J Hosp Infect 2017; 98:74-82. [PMID: 28764931 DOI: 10.1016/j.jhin.2017.07.031] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Accepted: 07/25/2017] [Indexed: 11/25/2022]
Abstract
BACKGROUND The survival of pathogenic micro-organisms in the healthcare environment has a major role in nosocomial infections. Among the responsible mechanisms enabling nosocomial pathogens to persist with these stress conditions is their ability to resist desiccation and to form biofilms. AIM To investigate the survival behaviour of Acinetobacter pittii isolates on inert surfaces and saline microcosms. METHODS Five A. pittii clinical strains were spotted over white laboratory coat fragments, glass, and plastic surfaces, or inoculated into sterile saline and monitored at room temperature for a period of 43 days. FINDINGS Although the permanence on solid surfaces negatively affected the culturability of the strains used, a fraction of stressed cells survived for at least the period of study. On average, A. pittii culturability was reduced by 77.3%, 80.9%, and 68.1% in white coat, plastic, and glass surfaces, respectively. However, ∼85.6% of the populations retain their culturability in saline solution. Culturability correlated with the presence of cells with an intact membrane, as demonstrated after live/dead staining. Supplementation of the culture medium with sodium pyruvate favoured the culturability of strains from all conditions; but, in general, A. pittii populations did not enter a viable but non-culturable state. CONCLUSION After long-term desiccation, all A. pittii strains retained, or even increased, their ability to form biofilms after they had been fed with nutrient media. This suggests that A. pittii may recover easily from desiccation and may express adherence factors to infect new hosts after rehydration.
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Affiliation(s)
- Z Bravo
- Instituto de Investigación Valdecilla IDIVAL, Santander, Spain; Department of Immunology, Microbiology and Parasitology, Faculty of Science and Technology, University of the Basque Country, Leioa, Spain
| | - I Chapartegui-González
- Instituto de Investigación Valdecilla IDIVAL, Santander, Spain; Servicio de Microbiología, Hospital Universitario Marqués de Valdecilla, Santander, Spain
| | - M Lázaro-Díez
- Instituto de Investigación Valdecilla IDIVAL, Santander, Spain; Servicio de Microbiología, Hospital Universitario Marqués de Valdecilla, Santander, Spain; Red Española de Investigación en Patología Infecciosa (REIPI), Instituto de Salud Carlos III, Madrid, Spain
| | - J Ramos-Vivas
- Instituto de Investigación Valdecilla IDIVAL, Santander, Spain; Servicio de Microbiología, Hospital Universitario Marqués de Valdecilla, Santander, Spain; Red Española de Investigación en Patología Infecciosa (REIPI), Instituto de Salud Carlos III, Madrid, Spain.
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28
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Rodríguez-Arce I, Martí S, Euba B, Fernández-Calvet A, Moleres J, López-López N, Barberán M, Ramos-Vivas J, Tubau F, Losa C, Ardanuy C, Leiva J, Yuste JE, Garmendia J. Inactivation of the Thymidylate Synthase thyA in Non-typeable Haemophilus influenzae Modulates Antibiotic Resistance and Has a Strong Impact on Its Interplay with the Host Airways. Front Cell Infect Microbiol 2017; 7:266. [PMID: 28676846 PMCID: PMC5476696 DOI: 10.3389/fcimb.2017.00266] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Accepted: 06/02/2017] [Indexed: 12/29/2022] Open
Abstract
Antibacterial treatment with cotrimoxazol (TxS), a combination of trimethoprim and sulfamethoxazole, generates resistance by, among others, acquisition of thymidine auxotrophy associated with mutations in the thymidylate synthase gene thyA, which can modify the biology of infection. The opportunistic pathogen non-typeable Haemophilus influenzae (NTHi) is frequently encountered in the lower airways of chronic obstructive pulmonary disease (COPD) patients, and associated with acute exacerbation of COPD symptoms. Increasing resistance of NTHi to TxS limits its suitability as initial antibacterial against COPD exacerbation, although its relationship with thymidine auxotrophy is unknown. In this study, the analysis of 2,542 NTHi isolates recovered at Bellvitge University Hospital (Spain) in the period 2010–2014 revealed 119 strains forming slow-growing colonies on the thymidine low concentration medium Mueller Hinton Fastidious, including one strain isolated from a COPD patient undergoing TxS therapy that was a reversible thymidine auxotroph. To assess the impact of thymidine auxotrophy in the NTHi-host interplay during respiratory infection, thyA mutants were generated in both the clinical isolate NTHi375 and the reference strain RdKW20. Inactivation of the thyA gene increased TxS resistance, but also promoted morphological changes consistent with elongation and impaired bacterial division, which altered H. influenzae self-aggregation, phosphorylcholine level, C3b deposition, and airway epithelial infection patterns. Availability of external thymidine contributed to overcome such auxotrophy and TxS effect, potentially facilitated by the nucleoside transporter nupC. Although, thyA inactivation resulted in bacterial attenuation in a lung infection mouse model, it also rendered a lower clearance upon a TxS challenge in vivo. Thus, our results show that thymidine auxotrophy modulates both the NTHi host airway interplay and antibiotic resistance, which should be considered at the clinical setting for the consequences of TxS administration.
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Affiliation(s)
- Irene Rodríguez-Arce
- Instituto de Agrobiotecnología, Consejo Superior de Investigaciones Científicas-Universidad Pública Navarra-GobiernoNavarra, Spain
| | - Sara Martí
- Centro de Investigación Biomédica en Red de Enfermedades RespiratoriasMadrid, Spain.,Departamento Microbiología, Hospital Universitari Bellvitge, University of Barcelona, Institut d'Investigació Biomédica de BellvitgeBarcelona, Spain
| | - Begoña Euba
- Instituto de Agrobiotecnología, Consejo Superior de Investigaciones Científicas-Universidad Pública Navarra-GobiernoNavarra, Spain.,Centro de Investigación Biomédica en Red de Enfermedades RespiratoriasMadrid, Spain
| | - Ariadna Fernández-Calvet
- Instituto de Agrobiotecnología, Consejo Superior de Investigaciones Científicas-Universidad Pública Navarra-GobiernoNavarra, Spain
| | - Javier Moleres
- Instituto de Agrobiotecnología, Consejo Superior de Investigaciones Científicas-Universidad Pública Navarra-GobiernoNavarra, Spain
| | - Nahikari López-López
- Instituto de Agrobiotecnología, Consejo Superior de Investigaciones Científicas-Universidad Pública Navarra-GobiernoNavarra, Spain
| | | | - José Ramos-Vivas
- Servicio Microbiología, Hospital Universitario Marqués de Valdecilla and Instituto de Investigación Marqués de ValdecillaSantander, Spain.,Red Española de Investigación en Patología Infecciosa, Instituto de Salud Carlos IIIMadrid, Spain
| | - Fe Tubau
- Centro de Investigación Biomédica en Red de Enfermedades RespiratoriasMadrid, Spain.,Departamento Microbiología, Hospital Universitari Bellvitge, University of Barcelona, Institut d'Investigació Biomédica de BellvitgeBarcelona, Spain
| | - Carmen Losa
- Servicio de Microbiología, Clínica Universidad de NavarraNavarra, Spain
| | - Carmen Ardanuy
- Centro de Investigación Biomédica en Red de Enfermedades RespiratoriasMadrid, Spain.,Departamento Microbiología, Hospital Universitari Bellvitge, University of Barcelona, Institut d'Investigació Biomédica de BellvitgeBarcelona, Spain
| | - José Leiva
- Servicio de Microbiología, Clínica Universidad de NavarraNavarra, Spain
| | - José E Yuste
- Centro de Investigación Biomédica en Red de Enfermedades RespiratoriasMadrid, Spain.,Centro Nacional de Microbiología, Instituto de Salud Carlos IIIMadrid, Spain
| | - Junkal Garmendia
- Instituto de Agrobiotecnología, Consejo Superior de Investigaciones Científicas-Universidad Pública Navarra-GobiernoNavarra, Spain.,Centro de Investigación Biomédica en Red de Enfermedades RespiratoriasMadrid, Spain
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Liu J, Fu K, Wang Y, Wu C, Li F, Shi L, Ge Y, Zhou L. Detection of Diverse N-Acyl-Homoserine Lactones in Vibrio alginolyticus and Regulation of Biofilm Formation by N-(3-Oxodecanoyl) Homoserine Lactone In vitro. Front Microbiol 2017; 8:1097. [PMID: 28670299 PMCID: PMC5472671 DOI: 10.3389/fmicb.2017.01097] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2016] [Accepted: 05/30/2017] [Indexed: 11/15/2022] Open
Abstract
Quorum sensing (QS) is a cell-to-cell communication system based on the exchange of small intercellular signal molecules, such as N-Acyl homoserine lactones (AHLs), which act as cell-density mediators of QS gene expression, and are highly variable both in types and amounts in most Gram-negative Proteobacteria. Understanding the regulation of AHLs may contribute to the elucidation of cell density-dependent phenomena, such as biofilm formation. Vibrio alginolyticus is among the most frequently observed marine opportunistic Vibrio pathogens. However, AHL production of this species and its effects on biofilm formation remain to be understood. Here, our study reported the diverse AHL profiles of 47 marine-isolated V. alginolyticus strains and the effects of exogenous 3-oxo-C10-HSL on biofilm formation under different temperature conditions (16°C and 28°C). A total of 11 detected AHLs were produced by the isolates, of which 3-OH-C4-HSL, 3-oxo-C10-HSL and 3-oxo-C14-HSL comprised the largest proportions. We also observed that moderate levels of exogenous 3-oxo-C10-HSL (10 and 20 μM) could induce or enhance biofilm formation and alter its structure, while high levels (40 and 100 μM) did not significantly improve and even inhibited biofilm formation in V. alginolyticus. Further, regulation by exogenous 3-oxo-C10-HSL was both concentration- and temperature-dependent in V. alginolyticus.
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Affiliation(s)
- Jianfei Liu
- Department of Biochemistry and Molecular Biology, Medical College of Qingdao UniversityQingdao, China.,Central Laboratory, Navy General Hospital of PLABeijing, China
| | - Kaifei Fu
- Central Laboratory, Navy General Hospital of PLABeijing, China
| | - Yuxiao Wang
- Central Laboratory, Navy General Hospital of PLABeijing, China
| | - Chenglin Wu
- Central Laboratory, Navy General Hospital of PLABeijing, China
| | - Fei Li
- Central Laboratory, Navy General Hospital of PLABeijing, China
| | - Lei Shi
- Institute of Food Safety and Nutrition, Jinan UniversityGuangzhou, China
| | - Yinlin Ge
- Department of Biochemistry and Molecular Biology, Medical College of Qingdao UniversityQingdao, China
| | - Lijun Zhou
- Central Laboratory, Navy General Hospital of PLABeijing, China
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Jiang D, Feng D, Jiang H, Yuan L, Yongqi Y, Xu X, Fang W. Preliminary study on an innovative, simple mast cell-based electrochemical method for detecting foodborne pathogenic bacterial quorum signaling molecules (N-acyl-homoserine-lactones). Biosens Bioelectron 2017; 90:436-442. [DOI: 10.1016/j.bios.2016.09.096] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Revised: 09/07/2016] [Accepted: 09/26/2016] [Indexed: 12/23/2022]
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Zelaya-Molina LX, Hernández-Soto LM, Guerra-Camacho JE, Monterrubio-López R, Patiño-Siciliano A, Villa-Tanaca L, Hernández-Rodríguez C. Ammonia-Oligotrophic and Diazotrophic Heavy Metal-Resistant Serratia liquefaciens Strains from Pioneer Plants and Mine Tailings. MICROBIAL ECOLOGY 2016; 72:324-346. [PMID: 27138047 DOI: 10.1007/s00248-016-0771-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2015] [Accepted: 04/12/2016] [Indexed: 06/05/2023]
Abstract
Mine tailings are man-made environments characterized by low levels of organic carbon and assimilable nitrogen, as well as moderate concentrations of heavy metals. For the introduction of nitrogen into these environments, a key role is played by ammonia-oligotrophic/diazotrophic heavy metal-resistant guilds. In mine tailings from Zacatecas, Mexico, Serratia liquefaciens was the dominant heterotrophic culturable species isolated in N-free media from bulk mine tailings as well as the rhizosphere, roots, and aerial parts of pioneer plants. S. liquefaciens strains proved to be a meta-population with high intraspecific genetic diversity and a potential to respond to these extreme conditions. The phenotypic and genotypic features of these strains reveal the potential adaptation of S. liquefaciens to oligotrophic and nitrogen-limited mine tailings with high concentrations of heavy metals. These features include ammonia-oligotrophic growth, nitrogen fixation, siderophore and indoleacetic acid production, phosphate solubilization, biofilm formation, moderate tolerance to heavy metals under conditions of diverse nitrogen availability, and the presence of zntA, amtB, and nifH genes. The acetylene reduction assay suggests low nitrogen-fixing activity. The nifH gene was harbored in a plasmid of ∼60 kb and probably was acquired by a horizontal gene transfer event from Klebsiella variicola.
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Affiliation(s)
- Lily X Zelaya-Molina
- Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prol. de Carpio y Plan de Ayala s/n. Col. Sto. Tomás, 11340, Mexico, D.F., Mexico
| | - Luis M Hernández-Soto
- Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prol. de Carpio y Plan de Ayala s/n. Col. Sto. Tomás, 11340, Mexico, D.F., Mexico
| | - Jairo E Guerra-Camacho
- Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prol. de Carpio y Plan de Ayala s/n. Col. Sto. Tomás, 11340, Mexico, D.F., Mexico
| | - Ricardo Monterrubio-López
- Departamento de Ingeniería Bioquímica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prol. de Carpio y Plan de Ayala s/n. Col. Sto. Tomás, 11340, Mexico, D.F., Mexico
| | - Alfredo Patiño-Siciliano
- Departamento de Botánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prol. de Carpio y Plan de Ayala s/n. Col. Sto. Tomás, 11340, Mexico, D.F., Mexico
| | - Lourdes Villa-Tanaca
- Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prol. de Carpio y Plan de Ayala s/n. Col. Sto. Tomás, 11340, Mexico, D.F., Mexico
| | - César Hernández-Rodríguez
- Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prol. de Carpio y Plan de Ayala s/n. Col. Sto. Tomás, 11340, Mexico, D.F., Mexico.
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Lin L, Dai S, Tian B, Li T, Yu J, Liu C, Wang L, Xu H, Zhao Y, Hua Y. DqsIR quorum sensing-mediated gene regulation of the extremophilic bacterium Deinococcus radiodurans in response to oxidative stress. Mol Microbiol 2016; 100:527-41. [PMID: 26789904 DOI: 10.1111/mmi.13331] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/18/2016] [Indexed: 11/30/2022]
Abstract
Here, we show that AHLs can be employed by Deinococcus radiodurans, which belongs to the unique phylum Deinococcus-Thermus and is known for its cellular resistance to environmental stresses. An AHL-mediated quorum-sensing system (DqsI/DqsR) was identified in D. radiodurans. We found that under non-stress conditions, the AHL level was "shielded" by quorum quenching enzymes, whereas AHLs accumulated when D. radiodurans was exposed to oxidative stress. Upon exposure to H2 O2 , AHL synthetic enzymes (DqsI) were immediately induced, while the expression of quorum-quenching enzymes began to increase approximately 30 min after exposure to H2 O2 , as shown by time-course analyses of gene expression. Both dqsI mutant (DMDqsI) and dqsR mutant (MDqsR) were more sensitive to oxidative stress compared with the wild-type strain. Exogenous AHLs (5 μM) could completely restore the survival fraction of DMDqsI under oxidative stress. RNA-seq analysis showed that a number of genes involved in stress-response, cellular cleansing, and DNA repair had altered transcriptional levels in MDqsR. The DqsR, acting as a regulator of quorum sensing, controls gene expression along with AHLs. Hence, the DqsIR-mediated quorum sensing that mediates gene regulation is an adaptive strategy for D. radiodurans in response to oxidative stresses and is conserved in the extremophilic Deinococcus bacteria.
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Affiliation(s)
- Lin Lin
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, Hangzhou, China
| | - Shang Dai
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, Hangzhou, China
| | - Bing Tian
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, Hangzhou, China
| | - Tao Li
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, Hangzhou, China
| | - Jiangliu Yu
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, Hangzhou, China
| | - Chengzhi Liu
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, Hangzhou, China
| | - Liangyan Wang
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, Hangzhou, China
| | - Hong Xu
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, Hangzhou, China
| | - Ye Zhao
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, Hangzhou, China
| | - Yuejin Hua
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, Hangzhou, China
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Whole-Genome Sequence of Serratia liquefaciens HUMV-21, a Cytotoxic, Quorum-Sensing, and Biofilm-Producing Clinical Isolate. GENOME ANNOUNCEMENTS 2015; 3:3/3/e00533-15. [PMID: 26021922 PMCID: PMC4447907 DOI: 10.1128/genomea.00533-15] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
A clinical isolate of Serratia liquefaciens (strain HUMV-21) was obtained from a skin ulcer of an adult patient. We report here its complete genome assembly using PacBio single-molecule real-time (SMRT) sequencing, which resulted in a single circular chromosome with 5.3 Mb. About 5,844 protein-coding genes are predicted from this assembly.
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