1
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Silva AR, Melo LF, Keevil CW, Pereira A. Legionella colonization and 3D spatial location within a Pseudomonas biofilm. Sci Rep 2024; 14:16781. [PMID: 39039267 PMCID: PMC11263398 DOI: 10.1038/s41598-024-67712-4] [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: 05/08/2024] [Accepted: 07/15/2024] [Indexed: 07/24/2024] Open
Abstract
Biofilms are known to be critical for Legionella settlement in engineered water systems and are often associated with Legionnaire's Disease events. One of the key features of biofilms is their heterogeneous three-dimensional structure which supports the establishment of microbial interactions and confers protection to microorganisms. This work addresses the impact of Legionella pneumophila colonization of a Pseudomonas fluorescens biofilm, as information about the interactions between Legionella and biofilm structures is scarce. It combines a set of meso- and microscale biofilm analyses (Optical Coherence Tomography, Episcopic Differential Interference Contrast coupled with Epifluorescence Microscopy and Confocal Laser Scanning Microscopy) with PNA-FISH labelled L. pneumophila to tackle the following questions: (a) does the biofilm structure change upon L. pneumophila biofilm colonization?; (b) what happens to L. pneumophila within the biofilm over time and (c) where is L. pneumophila preferentially located within the biofilm? Results showed that P. fluorescens structure did not significantly change upon L. pneumophila colonization, indicating the competitive advantage of the first colonizer. Imaging of PNA-labelled L. pneumophila showed that compared to standard culture recovery it colonized to a greater extent the 3-day-old P. fluorescens biofilms, presumably entering in VBNC state by the end of the experiment. L. pneumophila was mostly located in the bottom regions of the biofilm, which is consistent with the physiological requirements of both bacteria and confers enhanced Legionella protection against external aggressions. The present study provides an expedited methodological approach to address specific systematic laboratory studies concerning the interactions between L. pneumophila and biofilm structure that can provide, in the future, insights for public health Legionella management of water systems.
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Affiliation(s)
- Ana Rosa Silva
- LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal
- ALiCE - Associate Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal
| | - Luis F Melo
- LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal
- ALiCE - Associate Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal
| | - C William Keevil
- School of Biological Sciences, University of Southampton, Southampton, UK
| | - Ana Pereira
- LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal.
- ALiCE - Associate Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal.
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2
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Messenger SR, McGuinniety EMR, Stevenson LJ, Owen JG, Challis GL, Ackerley DF, Calcott MJ. Metagenomic domain substitution for the high-throughput modification of nonribosomal peptides. Nat Chem Biol 2024; 20:251-260. [PMID: 37996631 DOI: 10.1038/s41589-023-01485-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Accepted: 10/12/2023] [Indexed: 11/25/2023]
Abstract
The modular nature of nonribosomal peptide biosynthesis has driven efforts to generate peptide analogs by substituting amino acid-specifying domains within nonribosomal peptide synthetase (NRPS) enzymes. Rational NRPS engineering has increasingly focused on finding evolutionarily favored recombination sites for domain substitution. Here we present an alternative evolution-inspired approach that involves large-scale diversification and screening. By amplifying amino acid-specifying domains en masse from soil metagenomic DNA, we substitute more than 1,000 unique domains into a pyoverdine NRPS. Initial fluorescence and mass spectrometry screens followed by sequencing reveal more than 100 functional domain substitutions, collectively yielding 16 distinct pyoverdines as major products. This metagenomic approach does not require the high success rates demanded by rational NRPS engineering but instead enables the exploration of large numbers of substitutions in parallel. This opens possibilities for the discovery and production of nonribosomal peptides with diverse biological activities.
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Affiliation(s)
- Sarah R Messenger
- School of Biological Sciences, Victoria University of Wellington, Wellington, New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, Victoria University of Wellington, Wellington, New Zealand
| | - Edward M R McGuinniety
- School of Biological Sciences, Victoria University of Wellington, Wellington, New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, Victoria University of Wellington, Wellington, New Zealand
| | - Luke J Stevenson
- School of Biological Sciences, Victoria University of Wellington, Wellington, New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, Victoria University of Wellington, Wellington, New Zealand
- Ferrier Research Institute, Victoria University of Wellington, Wellington, New Zealand
| | - Jeremy G Owen
- School of Biological Sciences, Victoria University of Wellington, Wellington, New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, Victoria University of Wellington, Wellington, New Zealand
| | - Gregory L Challis
- Department of Chemistry, University of Warwick, Coventry, UK
- Warwick Integrative Synthetic Biology Centre, University of Warwick, Coventry, UK
- Biomedicine Discovery Institute, Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia
- ARC Centre of Excellence for Innovations in Peptide and Protein Science, Monash University, Clayton, Victoria, Australia
| | - David F Ackerley
- School of Biological Sciences, Victoria University of Wellington, Wellington, New Zealand.
- Maurice Wilkins Centre for Molecular Biodiscovery, Victoria University of Wellington, Wellington, New Zealand.
| | - Mark J Calcott
- School of Biological Sciences, Victoria University of Wellington, Wellington, New Zealand.
- Maurice Wilkins Centre for Molecular Biodiscovery, Victoria University of Wellington, Wellington, New Zealand.
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3
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Zannotti M, Ramasamy KP, Loggi V, Vassallo A, Pucciarelli S, Giovannetti R. Hydrocarbon degradation strategy and pyoverdine production using the salt tolerant Antarctic bacterium Marinomonas sp. ef1. RSC Adv 2023; 13:19276-19285. [PMID: 37377865 PMCID: PMC10291279 DOI: 10.1039/d3ra02536e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Accepted: 06/20/2023] [Indexed: 06/29/2023] Open
Abstract
One of the most concerning environmental problems is represented by petroleum and its derivatives causing contamination of aquatic and underground environments. In this work, the degradation treatment of diesel using Antarctic bacteria is proposed. Marinomonas sp. ef1 is a bacterial strain isolated from a consortium associated with the Antarctic marine ciliate Euplotes focardii. Its potential in the degradation of hydrocarbons commonly present in diesel oil were studied. The bacterial growth was evaluated in culturing conditions that resembled the marine environment with 1% (v/v) of either diesel or biodiesel added; in both cases, Marinomonas sp. ef1 was able to grow. The chemical oxygen demand measured after the incubation of bacteria with diesel decreased, demonstrating the ability of bacteria to use diesel hydrocarbons as a carbon source and degrade them. The metabolic potential of Marinomonas to degrade aromatic compounds was supported by the identification in the genome of sequences encoding various enzymes involved in benzene and naphthalene degradation. Moreover, in the presence of biodiesel, a fluorescent yellow pigment was produced; this was isolated, purified and characterized by UV-vis and fluorescence spectroscopy, leading to its identification as a pyoverdine. These results suggest that Marinomonas sp. ef1 can be used in hydrocarbon bioremediation and in the transformation of these pollutants in molecules of interest.
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Affiliation(s)
- Marco Zannotti
- Chemistry Interdisciplinary Project, School of Science and Technology, Chemistry Division, University of Camerino 62032 Camerino Italy
- IridES s.r.l. Via Via Gentile III da Varano n° 1 62032 Camerino Italy
| | | | - Valentina Loggi
- Chemistry Interdisciplinary Project, School of Science and Technology, Chemistry Division, University of Camerino 62032 Camerino Italy
| | - Alberto Vassallo
- School of Biosciences and Veterinary Medicine, Biosciences and Biotechnology Division, University of Camerino 62032 Camerino Italy
| | - Sandra Pucciarelli
- School of Biosciences and Veterinary Medicine, Biosciences and Biotechnology Division, University of Camerino 62032 Camerino Italy
- IridES s.r.l. Via Via Gentile III da Varano n° 1 62032 Camerino Italy
| | - Rita Giovannetti
- Chemistry Interdisciplinary Project, School of Science and Technology, Chemistry Division, University of Camerino 62032 Camerino Italy
- IridES s.r.l. Via Via Gentile III da Varano n° 1 62032 Camerino Italy
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4
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Fazleeva RR, Nasretdinova GR, Gubaidullin AT, Evtyugin VG, Yanilkin VV. The two-step electrosynthesis of nanocomposites of Ag, Au, and Pd nanoparticles with iron(ii) oxide-hydroxide. NEW J CHEM 2022. [DOI: 10.1039/d1nj05844d] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The two-step electrosynthesis of metal nanoparticle (MNP, M = Ag, Pd, and Au) nanocomposites with iron oxide-hydroxide FeO-xFe(OH)2 was investigated.
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Affiliation(s)
- Rezeda R. Fazleeva
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov St. 8, 420088 Kazan, Russia
| | - Gulnaz R. Nasretdinova
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov St. 8, 420088 Kazan, Russia
| | - Aidar T. Gubaidullin
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov St. 8, 420088 Kazan, Russia
| | - Vladimir G. Evtyugin
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov St. 8, 420088 Kazan, Russia
| | - Vitaliy V. Yanilkin
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov St. 8, 420088 Kazan, Russia
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5
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Hofmann L, Hirsch M, Ruthstein S. Advances in Understanding of the Copper Homeostasis in Pseudomonas aeruginosa. Int J Mol Sci 2021; 22:2050. [PMID: 33669570 PMCID: PMC7922089 DOI: 10.3390/ijms22042050] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2021] [Revised: 02/10/2021] [Accepted: 02/15/2021] [Indexed: 12/12/2022] Open
Abstract
Thirty-five thousand people die as a result of more than 2.8 million antibiotic-resistant infections in the United States of America per year. Pseudomonas aeruginosa (P. aeruginosa) is classified a serious threat, the second-highest threat category of the U.S. Department of Health and Human Services. Among others, the World Health Organization (WHO) encourages the discovery and development of novel antibiotic classes with new targets and mechanisms of action without cross-resistance to existing classes. To find potential new target sites in pathogenic bacteria, such as P. aeruginosa, it is inevitable to fully understand the molecular mechanism of homeostasis, metabolism, regulation, growth, and resistances thereof. P. aeruginosa maintains a sophisticated copper defense cascade comprising three stages, resembling those of public safety organizations. These stages include copper scavenging, first responder, and second responder. Similar mechanisms are found in numerous pathogens. Here we compare the copper-dependent transcription regulators cueR and copRS of Escherichia coli (E. coli) and P. aeruginosa. Further, phylogenetic analysis and structural modelling of mexPQ-opmE reveal that this efflux pump is unlikely to be involved in the copper export of P. aeruginosa. Altogether, we present current understandings of the copper homeostasis in P. aeruginosa and potential new target sites for antimicrobial agents or a combinatorial drug regimen in the fight against multidrug resistant pathogens.
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Affiliation(s)
| | | | - Sharon Ruthstein
- Institute of Nanotechnology and Advanced Materials & Department of Chemistry, Faculty of Exact Sciences, Bar-Ilan University, Ramat-Gan 5290002, Israel; (L.H.); (M.H.)
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6
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Deshamukhya C, Das BJ, Chetri S, Paul D, Chanda DD, Banerjee T, Bhattacharjee A. Use of fluorescence foldscope as an effective tool for detection of biofilm formation in Pseudomonas aeruginosa. Indian J Med Microbiol 2020; 38:397-400. [PMID: 33154253 DOI: 10.4103/ijmm.ijmm_20_118] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Purpose Pseudomonas aeruginosa is an opportunistic pathogen with biofilm-forming ability, by the virtue of which they can evade the immune response and antimicrobial chemotherapy. Several methods have been designed for the detection of biofilms but require sophisticated instrumentation and expertise. The present study, therefore, used an improvised device, 'fluorescence foldscope' which is an origami-based fluorescence microscope as an easy and effective tool to detect biofilm formation. Methodology Three representatives of P. aeruginosa of clinical origin were taken for the study along with two reference strains PA01 and ATCC27853. The strains were cultured in Luria Bertani (LB) broth with and without carbapenem (imipenem and meropenem) and cephalosporin (ceftazidime, cefotaxime and ceftriaxone) pressure, respectively. The cultures were diluted to 1:100 in LB; seeded with sterile glass slides at 90° angle and incubated for 5 consecutive days. The slides were observed with fluorescence foldscope. Results Fluorescence emission was observed in two test isolates CD1 and CD2 at 48 and 72 h, respectively, whereas no fluorescence was observed in CD3. The fluorescence observed in the isolates was not affected by 2 μg/ml carbapenem pressure, while with 2 μg/ml ceftazidime stress, a change in fluorescence was observed in CD2 in comparison to the fluorescence observed under normal growth condition. Conclusion Fluorescence foldscopy is an effective and reliable tool for the detection of biofilm formation in clinical isolates of P. aeruginosa under different laboratory conditions. Biofilm-forming P. aeruginosa worsens the medical condition and is difficult to eradicate. The present study came up with an effective and reliable tool for the detection of biofilm formation in clinical isolates of P. aeruginosa.
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Affiliation(s)
| | | | - Shiela Chetri
- Department of Microbiology, Assam University, Silcahr, Assam, India
| | - Deepjyoti Paul
- Department of Microbiology, Assam University, Silcahr, Assam, India
| | - Debadatta Dhar Chanda
- Department of Microbiology, Silchar Medical College and Hospital, Silcahr, Assam, India
| | - Tuhina Banerjee
- Department of Microbiology, Institute of Medical Sciences, Benaras Hindu University, Varanasi, Uttar Pradesh, India
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7
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Muzio FM, Agaras BC, Masi M, Tuzi A, Evidente A, Valverde C. 7‐hydroxytropolone is the main metabolite responsible for the fungal antagonism of
Pseudomonas donghuensis
strain SVBP6. Environ Microbiol 2020; 22:2550-2563. [DOI: 10.1111/1462-2920.14925] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Revised: 01/06/2020] [Accepted: 01/23/2020] [Indexed: 12/13/2022]
Affiliation(s)
- Federico M. Muzio
- Laboratorio de Fisiología y Genética de Bacterias Beneficiosas para Plantas—Centro de Bioquímica y Microbiología del Suelo. Departamento de Ciencia y TecnologíaUniversidad Nacional de Quilmes—CONICET, Roque Sáenz Peña 352, Bernal B1876BXD Buenos Aires Argentina
| | - Betina C. Agaras
- Laboratorio de Fisiología y Genética de Bacterias Beneficiosas para Plantas—Centro de Bioquímica y Microbiología del Suelo. Departamento de Ciencia y TecnologíaUniversidad Nacional de Quilmes—CONICET, Roque Sáenz Peña 352, Bernal B1876BXD Buenos Aires Argentina
| | - Marco Masi
- Dipartimento di Scienze Chimiche, Università di Napoli “Federico II”Complesso Universitario Monte Sant'Angelo, Via Cintia 4, 80126 Naples Italy
| | - Angela Tuzi
- Dipartimento di Scienze Chimiche, Università di Napoli “Federico II”Complesso Universitario Monte Sant'Angelo, Via Cintia 4, 80126 Naples Italy
| | - Antonio Evidente
- Dipartimento di Scienze Chimiche, Università di Napoli “Federico II”Complesso Universitario Monte Sant'Angelo, Via Cintia 4, 80126 Naples Italy
| | - Claudio Valverde
- Laboratorio de Fisiología y Genética de Bacterias Beneficiosas para Plantas—Centro de Bioquímica y Microbiología del Suelo. Departamento de Ciencia y TecnologíaUniversidad Nacional de Quilmes—CONICET, Roque Sáenz Peña 352, Bernal B1876BXD Buenos Aires Argentina
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8
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LeTourneau MK, Marshall MJ, Grant M, Freeze PM, Strawn DG, Lai B, Dohnalkova AC, Harsh JB, Weller DM, Thomashow LS. Phenazine-1-Carboxylic Acid-Producing Bacteria Enhance the Reactivity of Iron Minerals in Dryland and Irrigated Wheat Rhizospheres. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:14273-14284. [PMID: 31751506 DOI: 10.1021/acs.est.9b03962] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Phenazine-1-carboxylic acid (PCA) is a broad-spectrum antibiotic produced by rhizobacteria in the dryland wheat fields of the Columbia Plateau. PCA and other phenazines reductively dissolve Fe and Mn oxyhydroxides in bacterial culture systems, but the impact of PCA upon Fe and Mn cycling in the rhizosphere is unknown. Here, concentrations of dithionite-extractable and poorly crystalline Fe were approximately 10% and 30-40% higher, respectively, in dryland and irrigated rhizospheres inoculated with the PCA-producing (PCA+) strain Pseudomonas synxantha 2-79 than in rhizospheres inoculated with a PCA-deficient mutant. However, rhizosphere concentrations of Fe(II) and Mn did not differ significantly, indicating that PCA-mediated redox transformations of Fe and Mn were transient or were masked by competing processes. Total Fe and Mn uptake into wheat biomass also did not differ significantly, but the PCA+ strain significantly altered Fe translocation into shoots. X-ray absorption near edge spectroscopy revealed an abundance of Fe-bearing oxyhydroxides and phyllosilicates in all rhizospheres. These results indicate that the PCA+ strain enhanced the reactivity and mobility of Fe derived from soil minerals without producing parallel changes in plant Fe uptake. This is the first report that directly links significant alterations of Fe-bearing minerals in the rhizosphere to a single bacterial trait.
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Affiliation(s)
- Melissa K LeTourneau
- Department of Crop & Soil Sciences , Washington State University , Pullman , Washington 99164-6420 , United States
- United State Department of Agriculture - Agricultural Research Service , Wheat Health, Genetics and Quality Research Unit , Pullman , Washington 99164-6430 , United States
| | - Matthew J Marshall
- Earth & Biological Sciences Directorate , Pacific Northwest National Laboratory , Richland , Washington 99352 , United States
| | - Michael Grant
- Department of Crop & Soil Sciences , Washington State University , Pullman , Washington 99164-6420 , United States
| | - Patrick M Freeze
- Department of Crop & Soil Sciences , Washington State University , Pullman , Washington 99164-6420 , United States
| | - Daniel G Strawn
- Department of Soil and Water Systems , University of Idaho , Moscow , Idaho 83844-2340 , United States
| | - Barry Lai
- Advanced Photon Source , Argonne National Laboratory , Argonne , Illinois 60439 , United States
| | - Alice C Dohnalkova
- Environmental Molecular Sciences Laboratory , Pacific Northwest National Laboratory , Richland , Washington 99352 , United States
| | - James B Harsh
- Department of Crop & Soil Sciences , Washington State University , Pullman , Washington 99164-6420 , United States
| | - David M Weller
- United State Department of Agriculture - Agricultural Research Service , Wheat Health, Genetics and Quality Research Unit , Pullman , Washington 99164-6430 , United States
| | - Linda S Thomashow
- United State Department of Agriculture - Agricultural Research Service , Wheat Health, Genetics and Quality Research Unit , Pullman , Washington 99164-6430 , United States
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9
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Childress ES, Garrison AT, Sheldon JR, Skaar EP, Lindsley CW. Total Synthesis of Hinduchelins A-D, Stereochemical Revision of Hinduchelin A, and Biological Evaluation of Natural and Unnatural Analogues. J Org Chem 2019; 84:6459-6464. [PMID: 31039303 DOI: 10.1021/acs.joc.9b00391] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Here, we report the first total synthesis of hinduchelins A-D, a family of nontoxic catechol derivatives from Streptoalloteichus hindustanus, possessing a druglike chemotype and modest iron-chelating ability. A concise synthesis was developed employing methyl 5-methyloxazole-4-carboxylate as a single starting material to provide hinduchelins A-D (and unnatural analogues) in only four steps and 5-15% overall yields; moreover, the stereochemistry of hinduchelin A was reassigned from ( S) to ( R). Biological evaluation confirmed that natural and unnatural hinduchelins are weak iron chelators (siderophores).
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Affiliation(s)
| | | | - Jessica R Sheldon
- Department of Pathology, Microbiology and Immunology , Vanderbilt University Medical Center , Nashville , Tennessee 37232 , United States
| | - Eric P Skaar
- Department of Pathology, Microbiology and Immunology , Vanderbilt University Medical Center , Nashville , Tennessee 37232 , United States
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10
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Conditional privatization of a public siderophore enables Pseudomonas aeruginosa to resist cheater invasion. Nat Commun 2018; 9:1383. [PMID: 29643375 PMCID: PMC5895777 DOI: 10.1038/s41467-018-03791-y] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Accepted: 03/13/2018] [Indexed: 01/06/2023] Open
Abstract
Understanding the mechanisms that promote cooperative behaviors of bacteria in their hosts is of great significance to clinical therapies. Environmental stress is generally believed to increase competition and reduce cooperation in bacteria. Here, we show that bacterial cooperation can in fact be maintained because of environmental stress. We show that Pseudomonas aeruginosa regulates the secretion of iron-scavenging siderophores in the presence of different environmental stresses, reserving this public good for private use in protection against reactive oxygen species when under stress. We term this strategy "conditional privatization". Using a combination of experimental evolution and theoretical modeling, we demonstrate that in the presence of environmental stress the conditional privatization strategy is resistant to invasion by non-producing cheaters. These findings show how the regulation of public goods secretion under stress affects the evolutionary stability of cooperation in a pathogenic population, which may assist in the rational development of novel therapies.
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11
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Yang J, Zhang Y, Zhang L, Wang H, Nie J, Qin Z, Li J, Xiao W. Analyte-triggered autocatalytic amplification combined with gold nanoparticle probes for colorimetric detection of heavy-metal ions. Chem Commun (Camb) 2018; 53:7477-7480. [PMID: 28480908 DOI: 10.1039/c7cc02198d] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
This work reports a new colorimetric nanosensor for the detection of heavy-metal ions that initially integrates analyte-triggered autocatalytic amplification with o-phenylenediamine-mediated aggregation of label-free gold nanoparticles. Its utility is well demonstrated with the simple, rapid, sensitive, and specific detection of Hg2+, Cu2+, and Ag+ targets with detection limits less than 3 nM.
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Affiliation(s)
- Juanhua Yang
- Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials, College of Chemistry and Bioengineering, Guilin University of Technology, 12 Jiangan Road, Guilin 541004, China.
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12
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Chen WJ, Kuo TY, Hsieh FC, Chen PY, Wang CS, Shih YL, Lai YM, Liu JR, Yang YL, Shih MC. Involvement of type VI secretion system in secretion of iron chelator pyoverdine in Pseudomonas taiwanensis. Sci Rep 2016; 6:32950. [PMID: 27605490 PMCID: PMC5015096 DOI: 10.1038/srep32950] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Accepted: 08/17/2016] [Indexed: 12/29/2022] Open
Abstract
Rice bacterial blight caused by Xanthomonas oryzae pv. oryzae (Xoo) is one of the most destructive rice diseases worldwide. Therefore, in addition to breeding disease-resistant rice cultivars, it is desirable to develop effective biocontrol agents against Xoo. Here, we report that a soil bacterium Pseudomonas taiwanensis displayed strong antagonistic activity against Xoo. Using matrix-assisted laser desorption/ionization imaging mass spectrometry, we identified an iron chelator, pyoverdine, secreted by P. taiwanensis that could inhibit the growth of Xoo. Through Tn5 mutagenesis of P. taiwanensis, we showed that mutations in genes that encode components of the type VI secretion system (T6SS) as well as biosynthesis and maturation of pyoverdine resulted in reduced toxicity against Xoo. Our results indicated that T6SS is involved in the secretion of endogenous pyoverdine. Mutations in T6SS component genes affected the secretion of mature pyoverdine from the periplasmic space into the extracellular medium after pyoverdine precursor is transferred to the periplasm by the inner membrane transporter PvdE. In addition, we also showed that other export systems, i.e., the PvdRT-OpmQ and MexAB-OprM efflux systems (for which there have been previous suggestions of involvement) and the type II secretion system (T2SS), are not involved in pyoverdine secretion.
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Affiliation(s)
- Wen-Jen Chen
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, 11529, Taiwan.,Institute of Biotechnology, National Taiwan University, Taipei, 10617, Taiwan
| | - Tzu-Yen Kuo
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, 11529, Taiwan
| | - Feng-Chia Hsieh
- Biopesticide Division, Taiwan Agricultural Chemicals and Toxic Substances Research Institute, Council of Agriculture, Taichung, 41358, Taiwan
| | - Pi-Yu Chen
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, 11529, Taiwan
| | - Chang-Sheng Wang
- Department of Agronomy, National Chung Hsing University, Taichung, 40227, Taiwan
| | - Yu-Ling Shih
- Institute of Biological Chemistry, Academia Sinica, Taipei, 11529, Taiwan
| | - Ying-Mi Lai
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, 11529, Taiwan
| | - Je-Ruei Liu
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, 11529, Taiwan.,Institute of Biotechnology, National Taiwan University, Taipei, 10617, Taiwan
| | - Yu-Liang Yang
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, 11529, Taiwan
| | - Ming-Che Shih
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, 11529, Taiwan.,Institute of Biotechnology, National Taiwan University, Taipei, 10617, Taiwan
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13
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Campestre MP, Castagno LN, Estrella MJ, Ruiz OA. Lotus japonicus plants of the Gifu B-129 ecotype subjected to alkaline stress improve their Fe(2+) bio-availability through inoculation with Pantoea eucalypti M91. JOURNAL OF PLANT PHYSIOLOGY 2016; 192:47-55. [PMID: 26815729 DOI: 10.1016/j.jplph.2016.01.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Revised: 01/05/2016] [Accepted: 01/05/2016] [Indexed: 06/05/2023]
Abstract
Inoculation assays with Pantoea eucalypti M91 were performed on Lotus japonicus ecotype Gifu. Under alkaline conditions, this ecotype is characterized by the development of interveinal chlorosis of the apical leaves due to low mobilization of Fe(2+). Inoculation with P. eucalypti M91, a plant growth-promoting bacterial strain capable of producing pyoverdine-like and pyochelin-like siderophores under alkaline growth conditions, alters the root, resulting in a herringbone pattern of root branching. Additional features include improvement in Fe(2+) transport to the shoots, acidification of the hydroponic solution of the plant cultures, and an accompanying increase in the efficiency of the PSII parameters. In addition, there was an increase in the expression of the FRO1 and IRT1 genes, accompanied by a significant increase in FRO activity. Results showed that P. eucalypti M91 has a beneficial effect on the Fe acquisition machinery of Strategy I, as described for non-graminaceous monocots and dicots, suggesting its potential as an inoculant for legume crops cultivated in alkaline soils.
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Affiliation(s)
- María Paula Campestre
- Unidad de Biotecnología 1, Instituto de Investigaciones Biotecnológicas-Instituto Tecnológico de Chascomús/Consejo Nacional de Investigaciones Científicas y Técnicas-Universidad Nacional de San Martín (IIB-INTECH/CONICET-UNSAM), Avenida Intendente Marino Km 8,2 CC 164, B7130IWA Chascomús, Argentina.
| | - Luis Nazareno Castagno
- Laboratorio de Microbiología del Suelo, Instituto de Investigaciones Biotecnológicas-Instituto Tecnológico de Chascomús/Consejo Nacional de Investigaciones Científicas y Técnicas-Universidad Nacional de San Martín (IIB-INTECH/CONICET-UNSAM), Avenida Intendente Marino Km 8,2 CC 164, B7130IWA Chascomús, Argentina.
| | - María Julia Estrella
- Laboratorio de Microbiología del Suelo, Instituto de Investigaciones Biotecnológicas-Instituto Tecnológico de Chascomús/Consejo Nacional de Investigaciones Científicas y Técnicas-Universidad Nacional de San Martín (IIB-INTECH/CONICET-UNSAM), Avenida Intendente Marino Km 8,2 CC 164, B7130IWA Chascomús, Argentina.
| | - Oscar Adolfo Ruiz
- Unidad de Biotecnología 1, Instituto de Investigaciones Biotecnológicas-Instituto Tecnológico de Chascomús/Consejo Nacional de Investigaciones Científicas y Técnicas-Universidad Nacional de San Martín (IIB-INTECH/CONICET-UNSAM), Avenida Intendente Marino Km 8,2 CC 164, B7130IWA Chascomús, Argentina.
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Embaby AM, Heshmat Y, Hussein A. Unusual non-fluorescent broad spectrum siderophore activity (SID EGYII) by Pseudomonas aeruginosa strain EGYII DSM 101801 and a new insight towards simple siderophore bioassay. AMB Express 2016; 6:26. [PMID: 27015845 PMCID: PMC4808072 DOI: 10.1186/s13568-016-0192-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Accepted: 03/08/2016] [Indexed: 01/12/2023] Open
Abstract
Present study highlights an unusual non-fluorescent hydroxamate broad spectrum siderophore (SID EGYII) activity from Pseudomonas aeruginosa strain EGYII DSM 101801, a soil bacterial isolate, along with simple low cost effective siderophore bioassay. Detection of SID EGYII activity qualitatively was proved by masking this activity against Erwinia amylovora strain EGY1 DSM 101800, an indicator strain, in well-cut diffusion assay containing 100 µM FeCl3. SID EGYII activity was expressed quantitatively as arbitrary units [Siderophore arbitrary units (SAU)] 380 SAU/mL against E. amylovora strain EGY1 DSM 101800. Maximal SID EGYII activity was achieved upon growing P. aeruginosa strain EGYII DSM 101801 in PYB broth at 180 rpm for 24 h. SID EGYII displayed a broad spectrum antimicrobial activity against some human pathogens (i.e., Gram-positive bacteria, Gram-negative bacteria and yeasts) and a fireblight plant pathogen. Interestingly, transformants of Escherichia coli JM109 (DE3)pSID/EGYII harboring P. aeruginosa strain EGYII DSM 101801 plasmid demonstrated a perceivable antimicrobial activity against E. amylovora strain EGY1 DSM 101800. The broad spectrum antimicrobial activity of the unusual non-fluorescent SID EGYII would underpin its high potential in targeting bacterial pathogens posing probable threats to human health and agricultural economy. The present simple low cost effective bioassay is a new insight towards an alternative to the expensive cumbersome siderophore Chrome Azurol S assay.
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Affiliation(s)
- Amira M. Embaby
- />Department of Biotechnology, Institute of Graduate Studies and Research, University of Alexandria, 163 Horreya Avenue, Chatby, P.O. Box 832, Alexandria, 21526 Egypt
| | - Yasmin Heshmat
- />Department of Biotechnology, Institute of Graduate Studies and Research, University of Alexandria, 163 Horreya Avenue, Chatby, P.O. Box 832, Alexandria, 21526 Egypt
| | - Ahmed Hussein
- />Department of Biotechnology, Institute of Graduate Studies and Research, University of Alexandria, 163 Horreya Avenue, Chatby, P.O. Box 832, Alexandria, 21526 Egypt
- />Department of Chemistry and Biochemistry, Texas Tech University, TX Lubbock, USA
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15
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Nagy K, Sipos O, Valkai S, Gombai É, Hodula O, Kerényi Á, Ormos P, Galajda P. Microfluidic study of the chemotactic response of Escherichia coli to amino acids, signaling molecules and secondary metabolites. BIOMICROFLUIDICS 2015; 9:044105. [PMID: 26339306 PMCID: PMC4506296 DOI: 10.1063/1.4926981] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Accepted: 07/02/2015] [Indexed: 05/08/2023]
Abstract
Quorum sensing and chemotaxis both affect bacterial behavior on the population level. Chemotaxis shapes the spatial distribution of cells, while quorum sensing realizes a cell-density dependent gene regulation. An interesting question is if these mechanisms interact on some level: Does quorum sensing, a density dependent process, affect cell density itself via chemotaxis? Since quorum sensing often spans across species, such a feedback mechanism may also exist between multiple species. We constructed a microfluidic platform to study these questions. A flow-free, stable linear chemical gradient is formed in our device within a few minutes that makes it suitable for sensitive testing of chemoeffectors: we showed that the amino acid lysine is a weak chemoattractant for Escherichia coli, while arginine is neutral. We studied the effect of quorum sensing signal molecules of Pseudomonas aeruginosa on E. coli chemotaxis. Our results show that N-(3-oxododecanoyl)-homoserine lactone (oxo-C12-HSL) and N-(butryl)-homoserine lactone (C4-HSL) are attractants. Furthermore, we tested the chemoeffector potential of pyocyanin and pyoverdine, secondary metabolites under a quorum sensing control. Pyocyanin is proved to be a weak attractant while pyoverdine are repellent. We demonstrated the usability of the device in co-culturing experiments, where we showed that various factors released by P. aeruginosa affect the dynamic spatial rearrangement of a neighboring E. coli population, while surface adhesion of the cells is also modulated.
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Affiliation(s)
- Krisztina Nagy
- Institute of Biophysics, Biological Research Centre of the Hungarian Academy of Sciences , Temesvari krt. 62, H-6726 Szeged, Hungary
| | - Orsolya Sipos
- Institute of Biophysics, Biological Research Centre of the Hungarian Academy of Sciences , Temesvari krt. 62, H-6726 Szeged, Hungary
| | - Sándor Valkai
- Institute of Biophysics, Biological Research Centre of the Hungarian Academy of Sciences , Temesvari krt. 62, H-6726 Szeged, Hungary
| | - Éva Gombai
- Institute of Biophysics, Biological Research Centre of the Hungarian Academy of Sciences , Temesvari krt. 62, H-6726 Szeged, Hungary
| | - Orsolya Hodula
- Institute of Biophysics, Biological Research Centre of the Hungarian Academy of Sciences , Temesvari krt. 62, H-6726 Szeged, Hungary
| | - Ádám Kerényi
- Institute of Biophysics, Biological Research Centre of the Hungarian Academy of Sciences , Temesvari krt. 62, H-6726 Szeged, Hungary
| | - Pál Ormos
- Institute of Biophysics, Biological Research Centre of the Hungarian Academy of Sciences , Temesvari krt. 62, H-6726 Szeged, Hungary
| | - Péter Galajda
- Institute of Biophysics, Biological Research Centre of the Hungarian Academy of Sciences , Temesvari krt. 62, H-6726 Szeged, Hungary
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16
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Yin K, Zhang W, Chen L. Pyoverdine secreted by Pseudomonas aeruginosa as a biological recognition element for the fluorescent detection of furazolidone. Biosens Bioelectron 2013; 51:90-6. [PMID: 23942357 DOI: 10.1016/j.bios.2013.07.038] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2013] [Revised: 07/17/2013] [Accepted: 07/22/2013] [Indexed: 10/26/2022]
Abstract
Methods for the rapid and sensitive detection of furazolidone, a pesticide used for the treatment of infections of animals and human beings, have been urgently recommended for its large residual, strong carcinogenicity and genotoxicity in the environment. In this study, a method for the detection of furazolidone based on the rapid fluorescence quenching of pyoverdine by furazolidone was developed. Pyoverdine secreted by a Pseudomonas aeruginosa strain PA1 was purified through affinity chromatography and its fluorescent property was characterized. The fluorescence of pyoverdine could be quenched by furazolidone with specificity, and based on this phenomenon a fluorescent method for furazolidone detection was established. Fluorescence of pyoverdine was quenched by furazolidone probably due to the electron transfer from pyoverdine to furazolidone. The optimal pH for the detection was 7.2 in 50 mM 3-(N-Morpholino) propanesulfonic acid solution, and the whole detection process could be completed within a few seconds. The linear range of the detection was 2-160 µM and the limit of detection (LOD) was 0.5 µM. This study developed a novel fluorescent method for furazolidone detection, and the rapid and specific fluorescent biosensor can be potentially applied for furazolidone detection in the aquatic samples.
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Affiliation(s)
- Kun Yin
- Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Shandong Provincial Key Laboratory of Coastal Zone Environmental Processes, YICCAS, Yantai, Shandong 264003, PR China; University of Chinese Academy of Science, Beijing 100049, PR China
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17
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Tank N, Rajendran N, Patel B, Saraf M. Evaluation and biochemical characterization of a distinctive pyoverdin from a pseudomonas isolated from chickpea rhizosphere. Braz J Microbiol 2012; 43:639-48. [PMID: 24031875 PMCID: PMC3768837 DOI: 10.1590/s1517-83822012000200028] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2011] [Revised: 07/27/2011] [Accepted: 01/16/2012] [Indexed: 11/21/2022] Open
Abstract
Microbial siderophores confiscate the available ferric ions around the roots and trigger a reaction resulting in plant growth promotion. In our study, a high level of siderophore production was observed from a newly isolated Pseudomonas sp. from the rhizosphere of Chickpea plants. Under an iron depleted condition in Standard Succinic acid medium a 1000 μgmL(-1) of siderophore production was achieved. Increasing the concentration of iron showed an inverse relationship between growth and siderophore production. Fourier Transform Infrared Spectroscopy (FTIR) analysis of the purified crystals, its UV spectral analysis and High Pressure Liquid Chromatography (HPLC) revealed the identity of the siderophore as similar to that of pyoverdin with distinctive characters. Electron spray ionization mass spectroscopy (ESIMS) shows presence of abundance of A1 ions (419 m/z) and branching of amino acids from B1-B5. This pyoverdin contains a cyclic tetra peptide but Serine and Arginine are missing. Based on our analysis and deviations from the reported structure of pyoverdin it is suggested that this pseudomonas produces distinctly characterized pyoverdin siderophore.
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Affiliation(s)
- Neelam Tank
- Department of Microbiology, University School of Sciences, Gujarat University of Sciences, Gujarat University , Ahmedabad 380 009, Gujarat , India
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18
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Dimkpa CO, McLean JE, Britt DW, Johnson WP, Arey B, Lea AS, Anderson AJ. Nanospecific Inhibition of Pyoverdine Siderophore Production in Pseudomonas chlororaphis O6 by CuO Nanoparticles. Chem Res Toxicol 2012; 25:1066-74. [DOI: 10.1021/tx3000285] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Christian O. Dimkpa
- Department of Biological Engineering, Utah State University, Logan Utah 84322, United States
- Department of Biology,
Utah
State University, Logan Utah 84322, United States
| | - Joan E. McLean
- Utah Water Research Laboratory, Utah State University, Logan, Utah 84322, United States
| | - David W. Britt
- Department of Biological Engineering, Utah State University, Logan Utah 84322, United States
| | - William P. Johnson
- Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, United
States
| | - Bruce Arey
- Pacific Northwest National Laboratory, Richland, Washington 99352, United
States
| | - A. Scott Lea
- Pacific Northwest National Laboratory, Richland, Washington 99352, United
States
| | - Anne J. Anderson
- Department of Biological Engineering, Utah State University, Logan Utah 84322, United States
- Department of Biology,
Utah
State University, Logan Utah 84322, United States
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19
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Yoder MF, Kisaalita WS. Iron specificity of a biosensor based on fluorescent pyoverdin immobilized in sol-gel glass. J Biol Eng 2011; 5:4. [PMID: 21554740 PMCID: PMC3114707 DOI: 10.1186/1754-1611-5-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2010] [Accepted: 05/10/2011] [Indexed: 11/10/2022] Open
Abstract
Two current technologies used in biosensor development are very promising: 1. The sol-gel process of making microporous glass at room temperature, and 2. Using a fluorescent compound that undergoes fluorescence quenching in response to a specific analyte. These technologies have been combined to produce an iron biosensor. To optimize the iron (II or III) specificity of an iron biosensor, pyoverdin (a fluorescent siderophore produced by Pseudomonas spp.) was immobilized in 3 formulations of porous sol-gel glass. The formulations, A, B, and C, varied in the amount of water added, resulting in respective R values (molar ratio of water:silicon) of 5.6, 8.2, and 10.8. Pyoverdin-doped sol-gel pellets were placed in a flow cell in a fluorometer and the fluorescence quenching was measured as pellets were exposed to 0.28 - 0.56 mM iron (II or III). After 10 minutes of exposure to iron, ferrous ion caused a small fluorescence quenching (89 - 97% of the initial fluorescence, over the range of iron tested) while ferric ion caused much greater quenching (65 - 88%). The most specific and linear response was observed for pyoverdin immobilized in sol-gel C. In contrast, a solution of pyoverdin (3.0 μM) exposed to iron (II or III) for 10 minutes showed an increase in fluorescence (101 - 114%) at low ferrous concentrations (0.45 - 2.18 μM) while exposure to all ferric ion concentrations (0.45 - 3.03 μM) caused quenching. In summary, the iron specificity of pyoverdin was improved by immobilizing it in sol-gel glass C.
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Affiliation(s)
- Michael F Yoder
- Department of Biological and Agricultural Engineering, Driftmier Engineering Center, University of Georgia Athens GA 30602, USA.
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20
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Adaptation of aerobically growing Pseudomonas aeruginosa to copper starvation. J Bacteriol 2008; 190:6706-17. [PMID: 18708503 DOI: 10.1128/jb.00450-08] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Restricted bioavailability of copper in certain environments can interfere with cellular respiration because copper is an essential cofactor of most terminal oxidases. The global response of the metabolically versatile bacterium and opportunistic pathogen Pseudomonas aeruginosa to copper limitation was assessed under aerobic conditions. Expression of cioAB (encoding an alternative, copper-independent, cyanide-resistant ubiquinol oxidase) was upregulated, whereas numerous iron uptake functions (including the siderophores pyoverdine and pyochelin) were expressed at reduced levels, presumably reflecting a lower demand for iron by respiratory enzymes. Wild-type P. aeruginosa was able to grow aerobically in a defined glucose medium depleted of copper, whereas a cioAB mutant did not grow. Thus, P. aeruginosa relies on the CioAB enzyme to cope with severe copper deprivation. A quadruple cyo cco1 cco2 cox mutant, which was deleted for all known heme-copper terminal oxidases of P. aeruginosa, grew aerobically, albeit more slowly than did the wild type, indicating that the CioAB enzyme is capable of energy conservation. However, the expression of a cioA'-'lacZ fusion was less dependent on the copper status in the quadruple mutant than in the wild type, suggesting that copper availability might affect cioAB expression indirectly, via the function of the heme-copper oxidases.
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22
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Gupta V, Saharan K, Kumar L, Gupta R, Sahai V, Mittal A. Spectrophotometric ferric ion biosensor fromPseudomonas fluorescens culture. Biotechnol Bioeng 2008; 100:284-96. [DOI: 10.1002/bit.21754] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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23
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Moll H, Johnsson A, Schäfer M, Pedersen K, Budzikiewicz H, Bernhard G. Curium(III) complexation with pyoverdins secreted by a groundwater strain of Pseudomonas fluorescens. Biometals 2007; 21:219-28. [PMID: 17653625 DOI: 10.1007/s10534-007-9111-x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2007] [Accepted: 07/13/2007] [Indexed: 10/23/2022]
Abstract
Pyoverdins, bacterial siderophores produced by ubiquitous fluorescent Pseudomonas species, have great potential to bind and thus transport actinides in the environment. Therefore, the influence of pyoverdins secreted by microbes on the migration processes of actinides must be taken into account in strategies for the risk assessment of potential nuclear waste disposal sites. The unknown interaction between curium(III) and the pyoverdins released by Pseudomonas fluorescens (CCUG 32456) isolated from the granitic rock aquifers at the Aspö Hard Rock Laboratory (Aspö HRL), Sweden, is the subject of this paper. The interaction between soluble species of curium(III) and pyoverdins was studied at trace curium(III) concentrations (3 x 10(-7)M) using time-resolved laser-induced fluorescence spectroscopy (TRLFS). Three Cm(3+)-P. fluorescens (CCUG 32456) pyoverdin species, M(p)H(q)L(r), could be identified from the fluorescence emission spectra, CmH(2)L(+), CmHL, and CmL(-), having peak maxima at 601, 607, and 611 nm, respectively. The large formation constants, log beta(121 )= 32.50 +/- 0.06, log beta(111) = 27.40 +/- 0.11, and log beta(101) = 19.30 +/- 0.17, compared to those of other chelating agents illustrate the unique complexation properties of pyoverdin-type siderophores. An indirect excitation mechanism for the curium(III) fluorescence was observed in the presence of the pyoverdin molecules.
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Affiliation(s)
- Henry Moll
- Institute of Radiochemistry, Forschungszentrum Dresden-Rossendorf, Dresden, Germany.
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24
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Weller DM. Pseudomonas biocontrol agents of soilborne pathogens: looking back over 30 years. PHYTOPATHOLOGY 2007; 97:250-6. [PMID: 18944383 DOI: 10.1094/phyto-97-2-0250] [Citation(s) in RCA: 235] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
ABSTRACT Pseudomonas spp. are ubiquitous bacteria in agricultural soils and have many traits that make them well suited as biocontrol agents of soilborne pathogens. Tremendous progress has been made in characterizing the process of root colonization by pseudomonads, the biotic and abiotic factors affecting colonization, bacterial traits and genes contributing to rhizosphere competence, and the mechanisms of pathogen suppression. This review looks back over the last 30 years of Pseudomonas biocontrol research and highlights key studies, strains, and findings that have had significant impact on shaping our current understanding of biological control by bacteria and the direction of future research.
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Yoder MF, Kisaalita WS. Fluorescence of pyoverdin in response to iron and other common well water metals. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2006; 41:369-80. [PMID: 16484070 DOI: 10.1080/10934520500423501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
When the fluorescent siderophore pyoverdin (produced by Pseudomonas aeruginosa) binds to a metal ion the fluorescence changes. A pyoverdin solution (in 0.1 M acetate buffer, pH 5.0) was placed in the microwells of a 96-well plate and varying concentrations of the metal cations Al(3+), Ca(2+), Cu(2+), Fe(2+), Fe(3+), Mn(2+), Mg(2+), and Zn(2+) were added. The fluorescence of pyoverdin 60 sec after the addition of an equimolar concentration of metal indicated: (1) no change for Ca(2+), Fe(2+), Mn(2+), Mg(2+), and Zn(2+); (2) a small increase (109%) for Al(3+); (3) decreases in fluorescence for Cu(2+) (83%) and for Fe(3+) (66%). The fluorescence of pyoverdin 24 hr after the addition of equimolar metal indicated: 1) very little change for Ca(2+), Mn(2+), Mg(2+), and Zn(2+); 2) a very large (270%) increase in fluorescence due to Al(3+); 3) an increase (113%) due to Cu(2+); 4) large decreases in fluorescence for both Fe(2+) (15%) and Fe(3+) (0%). Thus, for an iron assay using a free solution of pyoverdin, even with a short (60 sec.) reaction time there can be interference due to Cu(2+), and interference due to high levels of Al(3+).
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Affiliation(s)
- Michael F Yoder
- Biological and Agricultural Engineering Department, Driftmier Engineering Center, University of Georgia, Athens, Georgia, USA
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Vullo DL, Ceretti HM, Hughes EA, Ramírez S, Zalts A. Indigenous heavy metal multiresistant microbiota of Las Catonas stream. ENVIRONMENTAL MONITORING AND ASSESSMENT 2005; 105:81-97. [PMID: 15952513 DOI: 10.1007/s10661-005-3157-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Las Catonas stream (Buenos Aires Metropolitan Area) receives a complex mixture of pollutants from point and diffuse sources because of the agricultural, industrial and urban land uses of its basin. Widespread detection of heavy metals exceeding aquatic life protection levels has occurred in monitoring reconnaissance studies in surface and pore water. As a result of the screening of Cu, Cd, Zn and Pb resistant/tolerant and culturable microbiota, B101N and 200H strains (Pseudomonas fluorescens or putida) were isolated and selected for further studies. They showed 65% Cd and 35% Zn extraction efficiency from aqueous phase. The potential use of these strains in wastewater treatment is currently investigated in order to contribute to decrease heavy metal pollution, a problem affecting every stream of Buenos Aires Metropolitan Area.
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Affiliation(s)
- Diana L Vullo
- Area Química, Instituto de Ciencias, Universidad Nacional de General Sarmiento, J.M. Gutierrez 1150, Los Polvorines, Provincia de Buenos Aires, Argentina.
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Shinozaki-Tajiri Y, Akutsu-Shigeno Y, Nakajima-Kambe T, Inomata S, Nomura N, Uchiyama H. Matrix metalloproteinase-2 inhibition and Zn2+-chelating activities of pyoverdine-type siderophores. J Biosci Bioeng 2004; 97:281-3. [PMID: 16233629 DOI: 10.1016/s1389-1723(04)70205-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2003] [Accepted: 01/30/2004] [Indexed: 10/26/2022]
Abstract
Pyoverdine-type siderophores from fluorescent Pseudomonas species were purified by Zn2+-chelate chromatography, and their matrix metalloproteinase-2 (MMP-2) inhibition and metal-ion-chelating activities were studied. Structurally different pyoverdines showed different MMP-2 inhibition activities, and the inhibition activity was correlated with Zn2+-chelating activity. The IC50 value of a pyoverdine ((P113A1)-2, MW 1187) for MMP-2 was 0.27 microg/ml (0.23 microM).
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Affiliation(s)
- Yukiko Shinozaki-Tajiri
- Institute of Applied Biochemistry, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan
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Abstract
Major pyoverdines from Pseudomonas fluorescens 2-79 (Pf-B), P. aeruginosa ATCC 15692 (Pa-C), and P. putida ATCC 12633 (Pp-C) were examined by absorption and fluorescence spectroscopic techniques to investigate the interaction between ferrous ion and the pyoverdine ligand. At physiological pH, ferrous ion quenched the fluorescence of all three pyoverdines much faster than ferric ion did. Also, increased absorbance at 460 nm was observed to be much faster for Fe2+ -pyoverdine than for Fe3+ -pyoverdine. At pH 7.4, about 90% of Fe3+ was bound by pyoverdine Pa-C after 24 h whereas Fe2+ was bound by the pyoverdine completely in only 5 min. The possibility that Fe2+ underwent rapid autoxidation before being bound by pyoverdine was considered unlikely, since the Fe2+ concentration in pyoverdine-free samples remained constant over a 3-min period at pH 7.4. Incubating excess Fe2+ with pyoverdine in the presence of 8-hydroxyquinoline, an Fe3+ -specific chelating agent, resulted in the formation of a Fe3+ -hydroxyquinoline complex, suggesting that the iron in the Fe2+ -pyoverdine complex existed in the oxidized form. These results strongly suggested that pyoverdines bind and oxidize the ferrous ion.
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Affiliation(s)
- R Xiao
- Biological and Agricultural Engineering Department, Driftmier Engineering Center, University of Georgia, Athens 30602, USA
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Jeong BC, Hawes C, Bonthrone KM, Macaskie LE. Iron acquisition from transferrin and lactoferrin by Pseudomonas aeruginosa pyoverdin. MICROBIOLOGY (READING, ENGLAND) 1997; 143 ( Pt 7):2497-2507. [PMID: 9245831 DOI: 10.1099/00221287-143-7-2509] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Growth of Pseudomonas aeruginosa ATCC 15692 was promoted when the strain was cultured in an iron-depleted succinate medium, supplemented with transferrin at 30%, 60% and 100% and lactoferrin at 60% and 100% iron-saturation. No significant differences between cell growth and pyoverdin production were observed when transferrin iron saturation was increased from 30% to 100%; however, cell growth and pyoverdin production were strongly dependent on lactoferrin iron saturation. Lower lactoferrin iron saturation (< 30%) resulted in more pyoverdin production and reduced cell growth. Incubation of pyoverdin (1.0 microM) with 10.0 microM transferrin (30%, 60% and 100% iron-saturated) or lactoferrin (60% and 100% iron-saturated) led to quenching of pyoverdin fluorescence. Also, 24 h incubation of pyoverdin (20.0 microM) with these two proteins (20.0 microM, 30%, 60% and 100% iron-saturated transferrin and 60% and 100% iron-saturated lactoferrin) at 25 degrees C resulted in increased absorbance at 460 nm. Both the fluorescence quenching and absorbance increases were iron-saturation-dependent. Taken together, these results support the conclusion that at physiological pH, P. aeruginosa pyoverdin can acquire from partially iron-saturated transferrin or lactoferrin.
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Affiliation(s)
- Byeong C Jeong
- School of Biological Sciences, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - Chris Hawes
- School of Biological and Molecular Sciences, Oxford Brookes University, Gipsy Lane, Oxford OX3 OBP, UK
| | - Karen M Bonthrone
- School of Biological Sciences, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - Lynne E Macaskie
- School of Biological Sciences, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
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Siderophores from fluorescent pseudomonas. ACTA ACUST UNITED AC 1996. [DOI: 10.1016/s1572-5995(96)80019-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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