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Gomez NO, Tetard A, Ouerdane L, Laffont C, Brutesco C, Ball G, Lobinski R, Denis Y, Plésiat P, Llanes C, Arnoux P, Voulhoux R. Involvement of the Pseudomonas aeruginosa MexAB-OprM efflux pump in the secretion of the metallophore pseudopaline. Mol Microbiol 2020; 115:84-98. [PMID: 32896017 DOI: 10.1111/mmi.14600] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Revised: 08/07/2020] [Accepted: 08/28/2020] [Indexed: 12/16/2022]
Abstract
To overcome the metal restriction imposed by the host's nutritional immunity, pathogenic bacteria use high metal affinity molecules called metallophores. Metallophore-mediated metal uptake pathways necessitate complex cycles of synthesis, secretion, and recovery of the metallophore across the bacterial envelope. We recently discovered staphylopine and pseudopaline, two members of a new family of broad-spectrum metallophores important for bacterial survival during infections. Here, we are expending the molecular understanding of the pseudopaline transport cycle across the diderm envelope of the Gram-negative bacterium Pseudomonas aeruginosa. We first explored pseudopaline secretion by performing in vivo quantifications in various genetic backgrounds and revealed the specific involvement of the MexAB-OprM efflux pump in pseudopaline transport across the outer membrane. We then addressed the recovery part of the cycle by investigating the fate of the recaptured metal-loaded pseudopaline. To do so, we combined in vitro reconstitution experiments and in vivo phenotyping in absence of pseudopaline transporters to reveal the existence of a pseudopaline modification mechanism, possibly involved in the metal release following pseudopaline recovery. Overall, our data allowed us to provide an improved molecular model of secretion, recovery, and fate of this important metallophore by P. aeruginosa.
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Affiliation(s)
- Nicolas Oswaldo Gomez
- Laboratoire de Chimie Bactérienne (LCB) UMR7283, Institut de Microbiologie de la Méditerranée (IMM), CNRS, Aix-Marseille Université, Marseille, France
| | - Alexandre Tetard
- Laboratoire de Bactériologie, UMR CNRS 6249 Chrono-Environnement, Faculté de Médecine-Pharmacie, Université de Bourgogne Franche-Comté, Besançon, France
| | - Laurent Ouerdane
- Université de Pau et des Pays de l'Adour, e2s UPPA, CNRS, IPREM-UMR5254, Hélioparc, Pau, France
| | - Clémentine Laffont
- CEA, CNRS, Aix-Marseille Université, Institut de Biosciences et Biotechnologies d'Aix-Marseille, UMR, CEA Cadarache, Saint-Paul-lez Durance, France
| | - Catherine Brutesco
- CEA, CNRS, Aix-Marseille Université, Institut de Biosciences et Biotechnologies d'Aix-Marseille, UMR, CEA Cadarache, Saint-Paul-lez Durance, France
| | - Geneviève Ball
- Laboratoire de Chimie Bactérienne (LCB) UMR7283, Institut de Microbiologie de la Méditerranée (IMM), CNRS, Aix-Marseille Université, Marseille, France
| | - Ryszard Lobinski
- Université de Pau et des Pays de l'Adour, e2s UPPA, CNRS, IPREM-UMR5254, Hélioparc, Pau, France
| | - Yann Denis
- CNRS, Aix-Marseille Université, Institut de Microbiologie de la Méditerranée (IMM), Marseille, France
| | - Patrick Plésiat
- Laboratoire de Bactériologie, UMR CNRS 6249 Chrono-Environnement, Faculté de Médecine-Pharmacie, Université de Bourgogne Franche-Comté, Besançon, France
| | - Catherine Llanes
- Laboratoire de Bactériologie, UMR CNRS 6249 Chrono-Environnement, Faculté de Médecine-Pharmacie, Université de Bourgogne Franche-Comté, Besançon, France
| | - Pascal Arnoux
- CEA, CNRS, Aix-Marseille Université, Institut de Biosciences et Biotechnologies d'Aix-Marseille, UMR, CEA Cadarache, Saint-Paul-lez Durance, France
| | - Romé Voulhoux
- Laboratoire de Chimie Bactérienne (LCB) UMR7283, Institut de Microbiologie de la Méditerranée (IMM), CNRS, Aix-Marseille Université, Marseille, France
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Hajjar C, Fanelli R, Laffont C, Brutesco C, Cullia G, Tribout M, Nurizzo D, Borezée-Durant E, Voulhoux R, Pignol D, Lavergne J, Cavelier F, Arnoux P. Control by Metals of Staphylopine Dehydrogenase Activity during Metallophore Biosynthesis. J Am Chem Soc 2019; 141:5555-5562. [DOI: 10.1021/jacs.9b01676] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Christine Hajjar
- Aix Marseille Université, CEA, CNRS,
BIAM, F-13108 Saint Paul-Lez-Durance, France
| | - Roberto Fanelli
- Institut des Biomolécules Max Mousseron, IBMM, UMR-5247, CNRS, Université Montpellier, ENSCM, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France
| | - Clémentine Laffont
- Aix Marseille Université, CEA, CNRS,
BIAM, F-13108 Saint Paul-Lez-Durance, France
| | - Catherine Brutesco
- Aix Marseille Université, CEA, CNRS,
BIAM, F-13108 Saint Paul-Lez-Durance, France
| | - Gregorio Cullia
- Institut des Biomolécules Max Mousseron, IBMM, UMR-5247, CNRS, Université Montpellier, ENSCM, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France
| | - Mathilde Tribout
- Aix Marseille Université, CEA, CNRS,
BIAM, F-13108 Saint Paul-Lez-Durance, France
| | - Didier Nurizzo
- European Synchrotron Radiation Facility, 71 Avenue des Martyrs, CS 40220, 38043 Grenoble, France
| | - Elise Borezée-Durant
- Micalis Institute, INRA, AgroParisTech, University Paris-Saclay, 78350 Jouy-en-Josas, France
| | - Romé Voulhoux
- Institut de Microbiologie de la Méditerranée, CNRS LCB UMR 7283, Aix Marseille Université, 31 Chemin Joseph Aiguier, 13009 Marseille, France
| | - David Pignol
- Aix Marseille Université, CEA, CNRS,
BIAM, F-13108 Saint Paul-Lez-Durance, France
| | - Jérôme Lavergne
- Aix Marseille Université, CEA, CNRS,
BIAM, F-13108 Saint Paul-Lez-Durance, France
| | - Florine Cavelier
- Institut des Biomolécules Max Mousseron, IBMM, UMR-5247, CNRS, Université Montpellier, ENSCM, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France
| | - Pascal Arnoux
- Aix Marseille Université, CEA, CNRS,
BIAM, F-13108 Saint Paul-Lez-Durance, France
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Lhospice S, Gomez NO, Ouerdane L, Brutesco C, Ghssein G, Hajjar C, Liratni A, Wang S, Richaud P, Bleves S, Ball G, Borezée-Durant E, Lobinski R, Pignol D, Arnoux P, Voulhoux R. Pseudomonas aeruginosa zinc uptake in chelating environment is primarily mediated by the metallophore pseudopaline. Sci Rep 2017; 7:17132. [PMID: 29214991 PMCID: PMC5719457 DOI: 10.1038/s41598-017-16765-9] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Accepted: 11/16/2017] [Indexed: 11/09/2022] Open
Abstract
Metal uptake is vital for all living organisms. In metal scarce conditions a common bacterial strategy consists in the biosynthesis of metallophores, their export in the extracellular medium and the recovery of a metal-metallophore complex through dedicated membrane transporters. Staphylopine is a recently described metallophore distantly related to plant nicotianamine that contributes to the broad-spectrum metal uptake capabilities of Staphylococcus aureus. Here we characterize a four-gene operon (PA4837-PA4834) in Pseudomonas aeruginosa involved in the biosynthesis and trafficking of a staphylopine-like metallophore named pseudopaline. Pseudopaline differs from staphylopine with regard to the stereochemistry of its histidine moiety associated with an alpha ketoglutarate moiety instead of pyruvate. In vivo, the pseudopaline operon is regulated by zinc through the Zur repressor. The pseudopaline system is involved in nickel uptake in poor media, and, most importantly, in zinc uptake in metal scarce conditions mimicking a chelating environment, thus reconciling the regulation of the cnt operon by zinc with its function as the main zinc importer under these metal scarce conditions.
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Affiliation(s)
- Sébastien Lhospice
- CNRS et Aix-Marseille Université, Laboratoire d'Ingénierie des Systèmes Macromoléculaires (UMR7255), Institut de Microbiologie de la Méditerranée, Marseille, France
| | - Nicolas Oswaldo Gomez
- CNRS et Aix-Marseille Université, Laboratoire d'Ingénierie des Systèmes Macromoléculaires (UMR7255), Institut de Microbiologie de la Méditerranée, Marseille, France
| | - Laurent Ouerdane
- Université de Pau et des Pays de l'Adour/CNRS, Laboratoire de Chimie Analytique Bio-inorganique et Environnement, IPREM-UMR5254, Hélioparc, 2, Avenue Angot, 64053, Pau, France
| | - Catherine Brutesco
- CEA, CNRS and Aix-Marseille Université, Institut de Biosciences et Biotechnologies d'Aix-Marseille, UMR 7265 LBC, CEA Cadarache, Saint-Paul-lez-Durance, F-13108, France
| | - Ghassan Ghssein
- CEA, CNRS and Aix-Marseille Université, Institut de Biosciences et Biotechnologies d'Aix-Marseille, UMR 7265 LBC, CEA Cadarache, Saint-Paul-lez-Durance, F-13108, France
| | - Christine Hajjar
- CEA, CNRS and Aix-Marseille Université, Institut de Biosciences et Biotechnologies d'Aix-Marseille, UMR 7265 LBC, CEA Cadarache, Saint-Paul-lez-Durance, F-13108, France
| | - Ahmed Liratni
- CNRS et Aix-Marseille Université, Laboratoire d'Ingénierie des Systèmes Macromoléculaires (UMR7255), Institut de Microbiologie de la Méditerranée, Marseille, France
| | - Shuanglong Wang
- Université de Pau et des Pays de l'Adour/CNRS, Laboratoire de Chimie Analytique Bio-inorganique et Environnement, IPREM-UMR5254, Hélioparc, 2, Avenue Angot, 64053, Pau, France
| | - Pierre Richaud
- CEA, CNRS and Aix-Marseille Université, Institut de Biosciences et Biotechnologies d'Aix-Marseille, UMR 7265 LB3M, CEA Cadarache, Saint-Paul-lez Durance, F-13108, France
| | - Sophie Bleves
- CNRS et Aix-Marseille Université, Laboratoire d'Ingénierie des Systèmes Macromoléculaires (UMR7255), Institut de Microbiologie de la Méditerranée, Marseille, France
| | - Geneviève Ball
- CNRS et Aix-Marseille Université, Laboratoire d'Ingénierie des Systèmes Macromoléculaires (UMR7255), Institut de Microbiologie de la Méditerranée, Marseille, France
| | - Elise Borezée-Durant
- Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, 78350, Jouy-en-Josas, France
| | - Ryszard Lobinski
- Université de Pau et des Pays de l'Adour/CNRS, Laboratoire de Chimie Analytique Bio-inorganique et Environnement, IPREM-UMR5254, Hélioparc, 2, Avenue Angot, 64053, Pau, France
| | - David Pignol
- CEA, CNRS and Aix-Marseille Université, Institut de Biosciences et Biotechnologies d'Aix-Marseille, UMR 7265 LBC, CEA Cadarache, Saint-Paul-lez-Durance, F-13108, France
| | - Pascal Arnoux
- CEA, CNRS and Aix-Marseille Université, Institut de Biosciences et Biotechnologies d'Aix-Marseille, UMR 7265 LBC, CEA Cadarache, Saint-Paul-lez-Durance, F-13108, France.
| | - Romé Voulhoux
- CNRS et Aix-Marseille Université, Laboratoire d'Ingénierie des Systèmes Macromoléculaires (UMR7255), Institut de Microbiologie de la Méditerranée, Marseille, France.
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Prévéral S, Brutesco C, Descamps ECT, Escoffier C, Pignol D, Ginet N, Garcia D. A bioluminescent arsenite biosensor designed for inline water analyzer. Environ Sci Pollut Res Int 2017; 24:25-32. [PMID: 26769474 DOI: 10.1007/s11356-015-6000-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Accepted: 12/22/2015] [Indexed: 06/05/2023]
Abstract
Whole-cell biosensors based on the reporter gene system can offer rapid detection of trace levels of organic or metallic compounds in water. They are well characterized in laboratory conditions, but their transfer into technological devices for the surveillance of water networks remains at a conceptual level. The development of a semi-autonomous inline water analyzer stumbles across the conservation of the bacterial biosensors over a period of time compatible with the autonomy requested by the end-user while maintaining a satisfactory sensitivity, specificity, and time response. We focused here on assessing the effect of lyophilization on two biosensors based on the reporter gene system and hosted in Escherichia coli. The reporter gene used here is the entire bacterial luciferase lux operon (luxCDABE) for an autonomous bioluminescence emission without the need to add any substrate. In the cell-survival biosensor that is used to determine the overall fitness of the bacteria when mixed with the water sample, lux expression is driven by a constitutive E. coli promoter PrpoD. In the arsenite biosensor, the arsenite-inducible promoter P ars involved in arsenite resistance in E. coli controls lux expression. Evaluation of the shelf life of these lyophilized biosensors kept at 4 °C over a year evidenced that about 40 % of the lyophilized cells can be revived in such storage conditions. The performances of the lyophilized biosensor after 7 months in storage are maintained, with a detection limit of 0.2 μM arsenite for a response in about an hour with good reproducibility. These results pave the way to the use in tandem of both biosensors (one for general toxicity and one for arsenite contamination) as consumables of an autonomous analyzer in the field.
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Affiliation(s)
- Sandra Prévéral
- CEA, DSV, IBEB, Lab Bioenerget Cellulaire, Saint-Paul-lez-Durance, F-13108, France
- CNRS, UMR 7265 Biol Veget and Microbiol Environ, Saint-Paul-lez-Durance, F-13108, France
- Aix-Marseille Université, BVME UMR7265, Marseille, F-13284, France
| | - Catherine Brutesco
- CEA, DSV, IBEB, Lab Bioenerget Cellulaire, Saint-Paul-lez-Durance, F-13108, France
- CNRS, UMR 7265 Biol Veget and Microbiol Environ, Saint-Paul-lez-Durance, F-13108, France
- Aix-Marseille Université, BVME UMR7265, Marseille, F-13284, France
| | - Elodie C T Descamps
- CEA, DSV, IBEB, Lab Bioenerget Cellulaire, Saint-Paul-lez-Durance, F-13108, France
- CNRS, UMR 7265 Biol Veget and Microbiol Environ, Saint-Paul-lez-Durance, F-13108, France
- Aix-Marseille Université, BVME UMR7265, Marseille, F-13284, France
| | - Camille Escoffier
- CEA, DSV, IBEB, Lab Bioenerget Cellulaire, Saint-Paul-lez-Durance, F-13108, France
- CNRS, UMR 7265 Biol Veget and Microbiol Environ, Saint-Paul-lez-Durance, F-13108, France
- Aix-Marseille Université, BVME UMR7265, Marseille, F-13284, France
| | - David Pignol
- CEA, DSV, IBEB, Lab Bioenerget Cellulaire, Saint-Paul-lez-Durance, F-13108, France
- CNRS, UMR 7265 Biol Veget and Microbiol Environ, Saint-Paul-lez-Durance, F-13108, France
- Aix-Marseille Université, BVME UMR7265, Marseille, F-13284, France
| | - Nicolas Ginet
- CEA, DSV, IBEB, Lab Bioenerget Cellulaire, Saint-Paul-lez-Durance, F-13108, France.
- CNRS, UMR 7265 Biol Veget and Microbiol Environ, Saint-Paul-lez-Durance, F-13108, France.
- Aix-Marseille Université, BVME UMR7265, Marseille, F-13284, France.
| | - Daniel Garcia
- CEA, DSV, IBEB, Lab Bioenerget Cellulaire, Saint-Paul-lez-Durance, F-13108, France
- CNRS, UMR 7265 Biol Veget and Microbiol Environ, Saint-Paul-lez-Durance, F-13108, France
- Aix-Marseille Université, BVME UMR7265, Marseille, F-13284, France
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Descamps ECT, Meunier D, Brutesco C, Prévéral S, Franche N, Bazin I, Miclot B, Larosa P, Escoffier C, Fantino JR, Garcia D, Ansaldi M, Rodrigue A, Pignol D, Cholat P, Ginet N. Semi-autonomous inline water analyzer: design of a common light detector for bacterial, phage, and immunological biosensors. Environ Sci Pollut Res Int 2017; 24:66-72. [PMID: 27838908 DOI: 10.1007/s11356-016-8010-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Accepted: 10/26/2016] [Indexed: 06/06/2023]
Abstract
The use of biosensors as sensitive and rapid alert systems is a promising perspective to monitor accidental or intentional environmental pollution, but their implementation in the field is limited by the lack of adapted inline water monitoring devices. We describe here the design and initial qualification of an analyzer prototype able to accommodate three types of biosensors based on entirely different methodologies (immunological, whole-cell, and bacteriophage biosensors), but whose responses rely on the emission of light. We developed a custom light detector and a reaction chamber compatible with the specificities of the three systems and resulting in statutory detection limits. The water analyzer prototype resulting from the COMBITOX project can be situated at level 4 on the Technology Readiness Level (TRL) scale and this technical advance paves the way to the use of biosensors on-site.
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Affiliation(s)
- Elodie C T Descamps
- CEA, DRF, BIAM, Lab Bioenerget Cellulaire, 13108, Saint-Paul-lez-Durance, France
- CNRS, UMR Biol Veget & Microbiol Environ, 13108, Saint-Paul-lez-Durance, France
- Aix-Marseille Université, 13108, Saint-Paul-lez-Durance, France
| | - Damien Meunier
- AP2E, 240, rue Louis de Broglie, Les Méridiens Bâtiment A, CS90537, 13593, Aix-en-Provence, France
| | - Catherine Brutesco
- CEA, DRF, BIAM, Lab Bioenerget Cellulaire, 13108, Saint-Paul-lez-Durance, France
- CNRS, UMR Biol Veget & Microbiol Environ, 13108, Saint-Paul-lez-Durance, France
- Aix-Marseille Université, 13108, Saint-Paul-lez-Durance, France
| | - Sandra Prévéral
- CEA, DRF, BIAM, Lab Bioenerget Cellulaire, 13108, Saint-Paul-lez-Durance, France
- CNRS, UMR Biol Veget & Microbiol Environ, 13108, Saint-Paul-lez-Durance, France
- Aix-Marseille Université, 13108, Saint-Paul-lez-Durance, France
| | - Nathalie Franche
- Laboratoire de Chimie Bactérienne, UMR7283, Centre National de la Recherche Scientifique, Aix-Marseille Université, Marseille, France
| | - Ingrid Bazin
- Laboratoire de Génie de L'Environnement industriel, École des Mines d'Alès, CEDEX, 6 Avenue de Clavières, 30319, Alès, France
| | - Bertrand Miclot
- AP2E, 240, rue Louis de Broglie, Les Méridiens Bâtiment A, CS90537, 13593, Aix-en-Provence, France
| | - Philippe Larosa
- AP2E, 240, rue Louis de Broglie, Les Méridiens Bâtiment A, CS90537, 13593, Aix-en-Provence, France
| | - Camille Escoffier
- CEA, DRF, BIAM, Lab Bioenerget Cellulaire, 13108, Saint-Paul-lez-Durance, France
- CNRS, UMR Biol Veget & Microbiol Environ, 13108, Saint-Paul-lez-Durance, France
- Aix-Marseille Université, 13108, Saint-Paul-lez-Durance, France
| | - Jean-Raphael Fantino
- Laboratoire de Chimie Bactérienne, UMR7283, Centre National de la Recherche Scientifique, Aix-Marseille Université, Marseille, France
| | - Daniel Garcia
- CEA, DRF, BIAM, Lab Bioenerget Cellulaire, 13108, Saint-Paul-lez-Durance, France
- CNRS, UMR Biol Veget & Microbiol Environ, 13108, Saint-Paul-lez-Durance, France
- Aix-Marseille Université, 13108, Saint-Paul-lez-Durance, France
| | - Mireille Ansaldi
- Laboratoire de Chimie Bactérienne, UMR7283, Centre National de la Recherche Scientifique, Aix-Marseille Université, Marseille, France
| | - Agnès Rodrigue
- Université de Lyon, Lyon, F-69003, INSA de Lyon, F-69621, CNRS, UMR5240, Microbiologie, Adaptation et Pathogénie, Villeurbanne, Université Lyon 1, F-69622, Lyon, France
| | - David Pignol
- CEA, DRF, BIAM, Lab Bioenerget Cellulaire, 13108, Saint-Paul-lez-Durance, France
- CNRS, UMR Biol Veget & Microbiol Environ, 13108, Saint-Paul-lez-Durance, France
- Aix-Marseille Université, 13108, Saint-Paul-lez-Durance, France
| | - Pierre Cholat
- AP2E, 240, rue Louis de Broglie, Les Méridiens Bâtiment A, CS90537, 13593, Aix-en-Provence, France
| | - Nicolas Ginet
- CEA, DRF, BIAM, Lab Bioenerget Cellulaire, 13108, Saint-Paul-lez-Durance, France.
- CNRS, UMR Biol Veget & Microbiol Environ, 13108, Saint-Paul-lez-Durance, France.
- Aix-Marseille Université, 13108, Saint-Paul-lez-Durance, France.
- Laboratoire de Chimie Bactérienne, UMR7283, Centre National de la Recherche Scientifique, Aix-Marseille Université, Marseille, France.
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6
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Brutesco C, Prévéral S, Escoffier C, Descamps ECT, Prudent E, Cayron J, Dumas L, Ricquebourg M, Adryanczyk-Perrier G, de Groot A, Garcia D, Rodrigue A, Pignol D, Ginet N. Bacterial host and reporter gene optimization for genetically encoded whole cell biosensors. Environ Sci Pollut Res Int 2017; 24:52-65. [PMID: 27234828 DOI: 10.1007/s11356-016-6952-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Accepted: 05/20/2016] [Indexed: 06/05/2023]
Abstract
Whole-cell biosensors based on reporter genes allow detection of toxic metals in water with high selectivity and sensitivity under laboratory conditions; nevertheless, their transfer to a commercial inline water analyzer requires specific adaptation and optimization to field conditions as well as economical considerations. We focused here on both the influence of the bacterial host and the choice of the reporter gene by following the responses of global toxicity biosensors based on constitutive bacterial promoters as well as arsenite biosensors based on the arsenite-inducible Pars promoter. We observed important variations of the bioluminescence emission levels in five different Escherichia coli strains harboring two different lux-based biosensors, suggesting that the best host strain has to be empirically selected for each new biosensor under construction. We also investigated the bioluminescence reporter gene system transferred into Deinococcus deserti, an environmental, desiccation- and radiation-tolerant bacterium that would reduce the manufacturing costs of bacterial biosensors for commercial water analyzers and open the field of biodetection in radioactive environments. We thus successfully obtained a cell survival biosensor and a metal biosensor able to detect a concentration as low as 100 nM of arsenite in D. deserti. We demonstrated that the arsenite biosensor resisted desiccation and remained functional after 7 days stored in air-dried D. deserti cells. We also report here the use of a new near-infrared (NIR) fluorescent reporter candidate, a bacteriophytochrome from the magnetotactic bacterium Magnetospirillum magneticum AMB-1, which showed a NIR fluorescent signal that remained optimal despite increasing sample turbidity, while in similar conditions, a drastic loss of the lux-based biosensors signal was observed.
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Affiliation(s)
- Catherine Brutesco
- CEA, DRF, BIAM, Lab Bioenerget Cellulaire, Saint-Paul-lez-Durance, 13108, France
- CNRS, UMR Biol Veget and Microbiol Environ, Saint-Paul-lez-Durance, 13108, France
- Aix-Marseille Université, Saint-Paul-lez-Durance, 13108, France
| | - Sandra Prévéral
- CEA, DRF, BIAM, Lab Bioenerget Cellulaire, Saint-Paul-lez-Durance, 13108, France
- CNRS, UMR Biol Veget and Microbiol Environ, Saint-Paul-lez-Durance, 13108, France
- Aix-Marseille Université, Saint-Paul-lez-Durance, 13108, France
| | - Camille Escoffier
- CEA, DRF, BIAM, Lab Bioenerget Cellulaire, Saint-Paul-lez-Durance, 13108, France
- CNRS, UMR Biol Veget and Microbiol Environ, Saint-Paul-lez-Durance, 13108, France
- Aix-Marseille Université, Saint-Paul-lez-Durance, 13108, France
| | - Elodie C T Descamps
- CEA, DRF, BIAM, Lab Bioenerget Cellulaire, Saint-Paul-lez-Durance, 13108, France
- CNRS, UMR Biol Veget and Microbiol Environ, Saint-Paul-lez-Durance, 13108, France
- Aix-Marseille Université, Saint-Paul-lez-Durance, 13108, France
| | - Elsa Prudent
- Université de Lyon, Lyon, 69003, France
- INSA de Lyon, Villeurbanne, 69621, France
- CNRS, UMR5240, Microbiologie, Adaptation et Pathogénie, Université Lyon 1, Villeurbanne, 69622, France
| | - Julien Cayron
- Université de Lyon, Lyon, 69003, France
- INSA de Lyon, Villeurbanne, 69621, France
- CNRS, UMR5240, Microbiologie, Adaptation et Pathogénie, Université Lyon 1, Villeurbanne, 69622, France
| | - Louis Dumas
- CEA, DRF, BIAM, Lab Bioenerget Cellulaire, Saint-Paul-lez-Durance, 13108, France
- CNRS, UMR Biol Veget and Microbiol Environ, Saint-Paul-lez-Durance, 13108, France
- Aix-Marseille Université, Saint-Paul-lez-Durance, 13108, France
| | - Manon Ricquebourg
- CEA, DRF, BIAM, Lab Bioenerget Cellulaire, Saint-Paul-lez-Durance, 13108, France
- CNRS, UMR Biol Veget and Microbiol Environ, Saint-Paul-lez-Durance, 13108, France
- Aix-Marseille Université, Saint-Paul-lez-Durance, 13108, France
| | - Géraldine Adryanczyk-Perrier
- CEA, DRF, BIAM, Lab Bioenerget Cellulaire, Saint-Paul-lez-Durance, 13108, France
- CNRS, UMR Biol Veget and Microbiol Environ, Saint-Paul-lez-Durance, 13108, France
- Aix-Marseille Université, Saint-Paul-lez-Durance, 13108, France
| | - Arjan de Groot
- CEA, DRF, BIAM, Lab Bioenerget Cellulaire, Saint-Paul-lez-Durance, 13108, France
- CNRS, UMR Biol Veget and Microbiol Environ, Saint-Paul-lez-Durance, 13108, France
- Aix-Marseille Université, Saint-Paul-lez-Durance, 13108, France
| | - Daniel Garcia
- CEA, DRF, BIAM, Lab Bioenerget Cellulaire, Saint-Paul-lez-Durance, 13108, France
- CNRS, UMR Biol Veget and Microbiol Environ, Saint-Paul-lez-Durance, 13108, France
- Aix-Marseille Université, Saint-Paul-lez-Durance, 13108, France
| | - Agnès Rodrigue
- Université de Lyon, Lyon, 69003, France
- INSA de Lyon, Villeurbanne, 69621, France
- CNRS, UMR5240, Microbiologie, Adaptation et Pathogénie, Université Lyon 1, Villeurbanne, 69622, France
| | - David Pignol
- CEA, DRF, BIAM, Lab Bioenerget Cellulaire, Saint-Paul-lez-Durance, 13108, France
- CNRS, UMR Biol Veget and Microbiol Environ, Saint-Paul-lez-Durance, 13108, France
- Aix-Marseille Université, Saint-Paul-lez-Durance, 13108, France
| | - Nicolas Ginet
- CEA, DRF, BIAM, Lab Bioenerget Cellulaire, Saint-Paul-lez-Durance, 13108, France.
- CNRS, UMR Biol Veget and Microbiol Environ, Saint-Paul-lez-Durance, 13108, France.
- Aix-Marseille Université, Saint-Paul-lez-Durance, 13108, France.
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7
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Ghssein G, Brutesco C, Ouerdane L, Fojcik C, Izaute A, Wang S, Hajjar C, Lobinski R, Lemaire D, Richaud P, Voulhoux R, Espaillat A, Cava F, Pignol D, Borezée-Durant E, Arnoux P. Biosynthesis of a broad-spectrum nicotianamine-like metallophore in Staphylococcus aureus. Science 2016; 352:1105-9. [PMID: 27230378 DOI: 10.1126/science.aaf1018] [Citation(s) in RCA: 133] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Accepted: 04/12/2016] [Indexed: 12/11/2022]
Abstract
Metal acquisition is a vital microbial process in metal-scarce environments, such as inside a host. Using metabolomic exploration, targeted mutagenesis, and biochemical analysis, we discovered an operon in Staphylococcus aureus that encodes the different functions required for the biosynthesis and trafficking of a broad-spectrum metallophore related to plant nicotianamine (here called staphylopine). The biosynthesis of staphylopine reveals the association of three enzyme activities: a histidine racemase, an enzyme distantly related to nicotianamine synthase, and a staphylopine dehydrogenase belonging to the DUF2338 family. Staphylopine is involved in nickel, cobalt, zinc, copper, and iron acquisition, depending on the growth conditions. This biosynthetic pathway is conserved across other pathogens, thus underscoring the importance of this metal acquisition strategy in infection.
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Affiliation(s)
- Ghassan Ghssein
- Laboratoire de Bioénergétique Cellulaire, Institut de Biosciences et Biotechnology Aix-Marseille (BIAM), Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), 13108 Saint-Paul-lès-Durance, France. UMR 7265, Centre National de Recherche Scientifique, Saint-Paul-lès-Durance, France. Aix Marseille Université, Marseille, France
| | - Catherine Brutesco
- Laboratoire de Bioénergétique Cellulaire, Institut de Biosciences et Biotechnology Aix-Marseille (BIAM), Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), 13108 Saint-Paul-lès-Durance, France. UMR 7265, Centre National de Recherche Scientifique, Saint-Paul-lès-Durance, France. Aix Marseille Université, Marseille, France
| | - Laurent Ouerdane
- Université de Pau et des Pays de l'Adour/CNRS, Laboratoire de Chimie Analytique Bio-inorganique et Environnement, IPREM-UMR5254, Hélioparc, 2, Avenue Angot, 64053 Pau, France
| | - Clémentine Fojcik
- Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, 78350 Jouy-en-Josas, France
| | - Amélie Izaute
- Laboratoire de Bioénergétique Cellulaire, Institut de Biosciences et Biotechnology Aix-Marseille (BIAM), Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), 13108 Saint-Paul-lès-Durance, France. UMR 7265, Centre National de Recherche Scientifique, Saint-Paul-lès-Durance, France. Aix Marseille Université, Marseille, France
| | - Shuanglong Wang
- Université de Pau et des Pays de l'Adour/CNRS, Laboratoire de Chimie Analytique Bio-inorganique et Environnement, IPREM-UMR5254, Hélioparc, 2, Avenue Angot, 64053 Pau, France
| | - Christine Hajjar
- Laboratoire de Bioénergétique Cellulaire, Institut de Biosciences et Biotechnology Aix-Marseille (BIAM), Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), 13108 Saint-Paul-lès-Durance, France. UMR 7265, Centre National de Recherche Scientifique, Saint-Paul-lès-Durance, France. Aix Marseille Université, Marseille, France
| | - Ryszard Lobinski
- Université de Pau et des Pays de l'Adour/CNRS, Laboratoire de Chimie Analytique Bio-inorganique et Environnement, IPREM-UMR5254, Hélioparc, 2, Avenue Angot, 64053 Pau, France
| | - David Lemaire
- UMR 7265, Centre National de Recherche Scientifique, Saint-Paul-lès-Durance, France. Aix Marseille Université, Marseille, France. Lab Interact Protein Metal, BIAM, CEA, 13108 Saint-Paul-lès-Durance, France
| | - Pierre Richaud
- UMR 7265, Centre National de Recherche Scientifique, Saint-Paul-lès-Durance, France. Aix Marseille Université, Marseille, France. Lab Bioenerget Biotechnol Bacteries et Microalgues, BIAM, CEA, 13108 Saint-Paul-lès-Durance, France
| | - Romé Voulhoux
- CNRS et Aix-Marseille Université, Laboratoire d'Ingénierie des Systèmes Macromoléculaires (UMR7255), Institut de Microbiologie de la Méditerranée, Marseille, France
| | - Akbar Espaillat
- Laboratory for Molecular Infection Medicine Sweden, Department of Molecular Biology, Umeå Centre for Microbial Research, Umeå University, Umeå, Sweden
| | - Felipe Cava
- Laboratory for Molecular Infection Medicine Sweden, Department of Molecular Biology, Umeå Centre for Microbial Research, Umeå University, Umeå, Sweden
| | - David Pignol
- Laboratoire de Bioénergétique Cellulaire, Institut de Biosciences et Biotechnology Aix-Marseille (BIAM), Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), 13108 Saint-Paul-lès-Durance, France. UMR 7265, Centre National de Recherche Scientifique, Saint-Paul-lès-Durance, France. Aix Marseille Université, Marseille, France
| | - Elise Borezée-Durant
- Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, 78350 Jouy-en-Josas, France
| | - Pascal Arnoux
- Laboratoire de Bioénergétique Cellulaire, Institut de Biosciences et Biotechnology Aix-Marseille (BIAM), Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), 13108 Saint-Paul-lès-Durance, France. UMR 7265, Centre National de Recherche Scientifique, Saint-Paul-lès-Durance, France. Aix Marseille Université, Marseille, France.
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8
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Schue M, Fekete A, Ortet P, Brutesco C, Heulin T, Schmitt-Kopplin P, Achouak W, Santaella C. Modulation of metabolism and switching to biofilm prevail over exopolysaccharide production in the response of Rhizobium alamii to cadmium. PLoS One 2011; 6:e26771. [PMID: 22096497 PMCID: PMC3212527 DOI: 10.1371/journal.pone.0026771] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2011] [Accepted: 10/03/2011] [Indexed: 11/19/2022] Open
Abstract
Heavy metals such as cadmium (Cd(2+)) affect microbial metabolic processes. Consequently, bacteria adapt by adjusting their cellular machinery. We have investigated the dose-dependent growth effects of Cd(2+) on Rhizobium alamii, an exopolysaccharide (EPS)-producing bacterium that forms a biofilm on plant roots. Adsorption isotherms show that the EPS of R. alamii binds cadmium in competition with calcium. A metabonomics approach based on ion cyclotron resonance Fourier transform mass spectrometry has showed that cadmium alters mainly the bacterial metabolism in pathways implying sugars, purine, phosphate, calcium signalling and cell respiration. We determined the influence of EPS on the bacterium response to cadmium, using a mutant of R. alamii impaired in EPS production (MSΔGT). Cadmium dose-dependent effects on the bacterial growth were not significantly different between the R. alamii wild type (wt) and MSΔGT strains. Although cadmium did not modify the quantity of EPS isolated from R. alamii, it triggered the formation of biofilm vs planktonic cells, both by R. alamii wt and by MSΔGT. Thus, it appears that cadmium toxicity could be managed by switching to a biofilm way of life, rather than producing EPS. We conclude that modulations of the bacterial metabolism and switching to biofilms prevails in the adaptation of R. alamii to cadmium. These results are original with regard to the conventional role attributed to EPS in a biofilm matrix, and the bacterial response to cadmium.
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Affiliation(s)
- Mathieu Schue
- CEA, Lab Ecol Microbienne Rhizosphere & Environm Extre, iBEB, DSV, Saint-Paul-lez-Durance, France
- CNRS, Unite Mixte Rech Biol Vegetale & Microbiol Enviro, UMR 6191, Saint-Paul-lez-Durance, France
- Université Aix Marseille, Saint-Paul-lez-Durance, France
| | - Agnes Fekete
- Helmholtz-Zentrum Muenchen-German Research Center for Environmental Health, Institute for Ecological Chemistry, Department of BioGeochemistry and Analysis, Neuherberg, Germany
| | - Philippe Ortet
- CEA, Lab Ecol Microbienne Rhizosphere & Environm Extre, iBEB, DSV, Saint-Paul-lez-Durance, France
- CNRS, Unite Mixte Rech Biol Vegetale & Microbiol Enviro, UMR 6191, Saint-Paul-lez-Durance, France
- Université Aix Marseille, Saint-Paul-lez-Durance, France
| | - Catherine Brutesco
- CEA, Lab Ecol Microbienne Rhizosphere & Environm Extre, iBEB, DSV, Saint-Paul-lez-Durance, France
- CNRS, Unite Mixte Rech Biol Vegetale & Microbiol Enviro, UMR 6191, Saint-Paul-lez-Durance, France
- Université Aix Marseille, Saint-Paul-lez-Durance, France
| | - Thierry Heulin
- CEA, Lab Ecol Microbienne Rhizosphere & Environm Extre, iBEB, DSV, Saint-Paul-lez-Durance, France
- CNRS, Unite Mixte Rech Biol Vegetale & Microbiol Enviro, UMR 6191, Saint-Paul-lez-Durance, France
- Université Aix Marseille, Saint-Paul-lez-Durance, France
| | - Philippe Schmitt-Kopplin
- Helmholtz-Zentrum Muenchen-German Research Center for Environmental Health, Institute for Ecological Chemistry, Department of BioGeochemistry and Analysis, Neuherberg, Germany
- Department for Chemical-Technical Analysis Research Center Weihenstephan for Brewing and Food Quality, Technische Universität München, Freising-Weihenstephan, Germany
| | - Wafa Achouak
- CEA, Lab Ecol Microbienne Rhizosphere & Environm Extre, iBEB, DSV, Saint-Paul-lez-Durance, France
- CNRS, Unite Mixte Rech Biol Vegetale & Microbiol Enviro, UMR 6191, Saint-Paul-lez-Durance, France
- Université Aix Marseille, Saint-Paul-lez-Durance, France
| | - Catherine Santaella
- CEA, Lab Ecol Microbienne Rhizosphere & Environm Extre, iBEB, DSV, Saint-Paul-lez-Durance, France
- CNRS, Unite Mixte Rech Biol Vegetale & Microbiol Enviro, UMR 6191, Saint-Paul-lez-Durance, France
- Université Aix Marseille, Saint-Paul-lez-Durance, France
- * E-mail:
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9
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Berrin JG, Pierrugues O, Brutesco C, Alonso B, Montillet JL, Roby D, Kazmaier M. Stress induces the expression of AtNADK-1, a gene encoding a NAD(H) kinase in Arabidopsis thaliana. Mol Genet Genomics 2005; 273:10-9. [PMID: 15711971 DOI: 10.1007/s00438-005-1113-1] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2004] [Accepted: 12/22/2004] [Indexed: 11/30/2022]
Abstract
A novel Arabidopsis thaliana gene (AtNADK-1) was identified based on its response to radiation and oxidative stress. Levels of AtNADK-1 mRNA increase eight-fold following exposure to ionising radiation and are enhanced three-fold by treatment with hydrogen peroxide. The gene also appears to be differentially regulated during compatible and incompatible plant-pathogen interactions in response to Pseudomonas syringae pv. tomato. The full-length AtNADK-1 cDNA encodes a 58-kDa protein that shows high sequence homology to the recently defined family of NAD(H) kinases. Recombinant AtNADK-1 utilises ATP to phosphorylate both NAD and NADH, showing a two-fold preference for NADH. Using reverse genetics, we demonstrate that AtNADK-1 deficient plants display enhanced sensitivity to gamma irradiation and to paraquat-induced oxidative stress. Our results indicate that this novel NAD(H) kinase may contribute to the maintenance of redox status in Arabidopsis thaliana.
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Affiliation(s)
- Jean-Guy Berrin
- Département d'Ecophysiologie Végétale et de Microbiologie, Laboratoire de Bioénergétique Cellulaire, CEA Cadarache, Bât 156, 13108 Saint-Paul Lez Durance, France
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10
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Doucet-Chabeaud G, Godon C, Brutesco C, de Murcia G, Kazmaier M. Ionising radiation induces the expression of PARP-1 and PARP-2 genes in Arabidopsis. Mol Genet Genomics 2001; 265:954-63. [PMID: 11523787 DOI: 10.1007/s004380100506] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
By screening for Arabidopsis genes activated by ionising radiation (IR)-induced DNA damage, we have isolated a cDNA hybridising with a 3.2-kb mRNA that accumulates rapidly and strongly in irradiated cell suspensions or whole plants. The cDNA codes for a 110-kDa protein that is highly homologous to the 116-kDa vertebrate poly(ADP-ribose) polymerase (PARP-1). It is recognised by a human anti-PARP-1 antibody, binds efficiently to DNA strand interruptions in vitro, and catalyses DNA damage-dependent (ADP-ribose) polymer synthesis. We have named this protein AtPARP-1. We have also extended our observations to the Arabidopsis app (AtPARP-2) gene, demonstrating for the first time that IR-induced DNA strand interruptions induce rapid and massive accumulation of AtPARP-1 and AtPARP-2 transcripts, whereas dehydration and cadmium preferentially induce the accumulation of AtPARP-2 transcripts. The IR-induced PARP gene expression seen in Arabidopsis is in striking contrast to the post-translational activation of the PARP-1 protein that is associated with genotoxic stress in animal cells. AtPARP-1 transcripts accumulate in all plant organs after exposure to ionising radiation, but this is followed by an increase in AtPARP-1 protein levels only in tissues that contain large amounts of actively dividing cells. This cell-type specific accumulation of AtPARP-1 protein in response to DNA damage is compatible with a role for the AtPARP-1 protein in the maintenance of DNA integrity during replication, similar to the role of "guardian of the genome" attributed to its animal counterpart.
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Affiliation(s)
- G Doucet-Chabeaud
- CEA/Cadarache, DSV-DEVM-Laboratoire de Radiobiologie Végétale, Saint Paul-lez-Durance, France
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11
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Pierrugues O, Brutesco C, Oshiro J, Gouy M, Deveaux Y, Carman GM, Thuriaux P, Kazmaier M. Lipid phosphate phosphatases in Arabidopsis. Regulation of the AtLPP1 gene in response to stress. J Biol Chem 2001; 276:20300-8. [PMID: 11278556 DOI: 10.1074/jbc.m009726200] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
An Arabidopsis thaliana gene (AtLPP1) was isolated on the basis that it was transiently induced by ionizing radiation. The putative AtLPP1 gene product showed homology to the yeast and mammalian lipid phosphate phosphatase enzymes and possessed a phosphatase signature sequence motif. Heterologous expression and biochemical characterization of the AtLPP1 gene in yeast showed that it encoded an enzyme (AtLpp1p) that exhibited both diacylglycerol pyrophosphate phosphatase and phosphatidate phosphatase activities. Kinetic analysis indicated that diacylglycerol pyrophosphate was the preferred substrate for AtLpp1p in vitro. A second Arabidopsis gene (AtLPP2) was identified based on sequence homology to AtLPP1 that was also heterologously expressed in yeast. The AtLpp2p enzyme also utilized diacylglycerol pyrophosphate and phosphatidate but with no preference for either substrate. The AtLpp1p and AtLpp2p enzymes showed differences in their apparent affinities for diacylglycerol pyrophosphate and phosphatidate as well as other enzymological properties. Northern blot analyses showed that the AtLPP1 gene was preferentially expressed in leaves and roots, whereas the AtLPP2 gene was expressed in all tissues examined. AtLPP1, but not AtLPP2, was regulated in response to various stress conditions. The AtLPP1 gene was transiently induced by genotoxic stress (gamma ray or UV-B) and elicitor treatments with mastoparan and harpin. The regulation of the AtLPP1 gene in response to stress was consistent with the hypothesis that its encoded lipid phosphate phosphatase enzyme may attenuate the signaling functions of phosphatidate and/or diacylglycerol pyrophosphate that form in response to stress in plants.
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Affiliation(s)
- O Pierrugues
- CEA/Cadarache, DSV-DEVM Laboratoire de Radiobiologie Végétale, 13108 Saint Paul-lez-Durance, France
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12
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Valette H, Syrota A, Fuseau C, Brutesco C. In vivo effect of methyl-quinuclidinyl-benzylate on myocardial beta-adrenoceptor density. Eur J Pharmacol 1996; 306:133-8. [PMID: 8813625 DOI: 10.1016/0014-2999(96)00243-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The muscarinic receptor antagonist methyl-quinuclidinyl-benzylate decreased myocardial beta-adrenoceptor density Bmax: 20.4 +/- 2.4 pmol/ml tissue versus 33.3 +/- 4 pmol/ml tissue in control dogs (P < 0.001), as assessed by using [11C]CGP-12177 (((2S)-4-(3-t-butyl-amino-2 hydroxypropoxy)-benzimidazol-2-one)) and positron emission tomography. In contrast, atropine did not induce any change in Bmax: 33.7 +/- 3.6 pmol/ml tissue. We hypothetized that methyl-quinuclidinyl-benzylate induced the release of norepinephrine from sympathetic nerve terminals, an effect which could be blocked by guanethidine. Guanethidine alone (10 mg/kg) did not change Bmax: 35.5 +/- 6 pmol/ml tissue. Guanethidine + methyl-quinuclidinyl-benzylate did not induce any significant change in Bmax: 31.5 +/- 5.1 pmol/ml tissue. Therefore, it seems likely that methyl-quinuclidinyl-benzylate acts at the presynaptic level, probably inducing the release of norepinephrine which then causes a down-regulation of beta-adrenoceptors.
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Affiliation(s)
- H Valette
- Service Hospitalier Frédéric Joliot, DRIPP-DRM-CEA, Orsay, France
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13
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Loc'h C, Mardon K, Valette H, Brutesco C, Merlet P, Syrota A, Maziere B. Preparation and pharmacological characterization of [76Br]-meta-bromobenzylguanidine ([76Br]MBBG). Nucl Med Biol 1994; 21:49-55. [PMID: 9234263 DOI: 10.1016/0969-8051(94)90128-7] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
[76Br]-meta-Bromobenzylguanidine ([76Br]MBBG) was prepared from the iodinated analog (MIBG) and [76Br]NH4 using a Cu(+)-assisted halogen exchange reaction. [76Br]MBBG was produced in a 60-65% radiochemical yield with a specific activity of 20 MBq/nmol. In rats, biodistribution kinetic studies showed a high uptake of [76Br]MBBG in heart tissues with its maximum of 5% ID/S at 2 h p.i.; whereas 4 h p.i., the maximum of the heart-to-lung concentration ratio of 8 was observed. Metabolic studies in rats indicated that [76Br]MBBG was rapidly metabolized in plasma. However in heart tissue, 25 h p.i., 85% of the radioactivity still represented unchanged radiotracer. Pharmacological studies in rats showed that the myocardial uptake of [76Br]MBBG was similar to that of norepinephrine. After pretreatment of the rats, the uptake of [76Br]MBBG was reduced 4 h p.i. to the following values: after desipramine (DMI) to 37%, after dexamethasone (DXM) to 88% and after 6-hydroxydopamine (6-OHDA) to 16%. These preliminary results suggest that [76Br]MBBG can be useful for the assessment of heart catecholamine reuptake disorders with PET.
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Affiliation(s)
- C Loc'h
- Service Hospitalier Frédéric Joliot, DRIPP, DSV-CEA, Orsay, France
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