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Greigite et magnétite : les déterminants environnementaux et génétiques contrôlant la biominéralisation chez les bactéries magnétotactiques

Author: Elodie DescampsDavid PignolChristopher LefevreValérie MichoteyClaudine MédigueAll authors
Publisher: 2018.
Dissertation: Thèse de doctorat : Microbiologie : Aix-Marseille : 2018.
Edition/Format:   Computer file : Document : Thesis/dissertation : French
Summary:
Les bactéries magnétotactiques représentent un groupe d'une grande diversité écologique et phylogénétique. Elles sont capables de biominéraliser des nanocristaux de magnétite [un oxyde de fer (Fe(II)Fe(III)2O4)] ou de greigite [un sulfure de fer (Fe(II)Fe(III)2S4)] dans leurs magnétosomes, organites alignés en chaînes permettant la navigation le long des lignes de champ magnétique terrestre. Jusqu'à
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Details

Genre/Form: Thèses et écrits académiques
Material Type: Document, Thesis/dissertation, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: Elodie Descamps; David Pignol; Christopher Lefevre; Valérie Michotey; Claudine Médigue; Karim Benzerara; Damien Faivre; Alain Dolla; Aix-Marseille Université.; Ecole Doctorale Sciences de la Vie et de la Santé (Marseille).; Institut de biosciences et biotechnologies d'Aix-Marseille (BIAM).
OCLC Number: 1056626945
Notes: Titre provenant de l'écran-titre.
Description: 1 online resource
Responsibility: Elodie Descamps ; sous la direction de David Pignol et de Christopher Lefevre.

Abstract:

Les bactéries magnétotactiques représentent un groupe d'une grande diversité écologique et phylogénétique. Elles sont capables de biominéraliser des nanocristaux de magnétite [un oxyde de fer (Fe(II)Fe(III)2O4)] ou de greigite [un sulfure de fer (Fe(II)Fe(III)2S4)] dans leurs magnétosomes, organites alignés en chaînes permettant la navigation le long des lignes de champ magnétique terrestre. Jusqu'à récemment, seules des souches produisant de la magnétite étaient disponibles en culture pure, conduisant à des études sur les mécanismes de biominéralisation de cet oxyde de fer. En 2011, une nouvelle bactérie capable de former de la magnétite et de la greigite, Desulfamplus magnetovallimortis souche BW-1, a été cultivée avec succès en laboratoire. Dans cette thèse, nous proposons d'utiliser une approche intégrée et multidisciplinaire pour comprendre les mécanismes de biominéralisation de la greigite en utilisant comme modèle d'étude la souche BW-1. Nous avons donc cherché à déterminer les conditions environnementales et biologiques favorisant la formation de la magnétite et de la greigite. Ces travaux ont également conduit à la caractérisation physiologique et phylogénétique de BW-1. Puis, l'utilisation d'approches globales et ciblées de transcriptomique ont permis d'évaluer le taux d'expression des gènes impliqués dans la formation des magnétosomes (magnétite vs. greigite) dans diverses conditions de croissance. Une approche de protéomique a permis d'apporter des informations supplémentaires à cette étude. Ces résultats ont permis de progresser dans la compréhension fondamentale de la biominéralisation in vivo, en particulier pour des bactéries formant de la greigite.

Magnetotactic bacteria represent a phylogenetically and ecologically diverse group of prokaryotes able to biomineralize magnetic nanocrystals composed of magnetite [an iron oxide (Fe(II)Fe(III)2O4)] or greigite [an iron sulfide (Fe(II)Fe(III)2S4)] in their magnetosomes, a prokaryotic organelle whose cytoplasmic alignement in chain allows the cell to navigate along the Earth's magnetic field lines. Until recently, only magnetite-producing strains were available in pure culture. Thus, only the magnetite biomineralization has been studied. In 2011, a new bacterium able to form both magnetite and greigite, Desulfamplus magnetovallimortis strain BW-1, was isolated from Death Valley, California and cultivated in pure culture. In this work, we propose to use an integrated and multidisciplinary approach to understand the mechanisms involved in greigite biomineralization in BW-1 strain. First, we determined the environmental and biological conditions in which magnetite and greigite are formed. This first part of my thesis also contributed to the physiologic and phylogenetic characterization of this bacterium. Secondly, we used global and targeted transcriptomic approaches to evaluate the transcription levels of genes putatively involved in magnetosomes formation (magnetite vs. greigite) under various growth conditions. A proteomic approach provided additional informations to this study.Results obtained during my thesis contribute to the understanding of in vivo biomineralization, particularly for greigite production in magnetotactic bacteria.

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<http:\/\/www.worldcat.org\/oclc\/1056626945<\/a>> # Greigite et magn\u00E9tite : les d\u00E9terminants environnementaux et g\u00E9n\u00E9tiques contr\u00F4lant la biomin\u00E9ralisation chez les bact\u00E9ries magn\u00E9totactiques<\/span>\n\u00A0\u00A0\u00A0\u00A0a \nschema:CreativeWork<\/a>, bgn:ComputerFile<\/a>, bgn:Thesis<\/a>, schema:MediaObject<\/a> ;\u00A0\u00A0\u00A0\nbgn:inSupportOf<\/a> \"Th\u00E8se de doctorat : Microbiologie : Aix-Marseille : 2018.<\/span>\" ;\u00A0\u00A0\u00A0\nlibrary:oclcnum<\/a> \"1056626945<\/span>\" ;\u00A0\u00A0\u00A0\nlibrary:placeOfPublication<\/a> <http:\/\/id.loc.gov\/vocabulary\/countries\/fr<\/a>> ;\u00A0\u00A0\u00A0\nschema:about<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Thing\/greigite<\/a>> ; # Greigite<\/span>\n\u00A0\u00A0\u00A0\nschema:about<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Topic\/magnetosomes<\/a>> ; # Magn\u00E9tosomes<\/span>\n\u00A0\u00A0\u00A0\nschema:about<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Thing\/bacteries_magnetotactiques<\/a>> ; # Bact\u00E9ries magn\u00E9totactiques<\/span>\n\u00A0\u00A0\u00A0\nschema:about<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Thing\/organite_procaryote<\/a>> ; # Organite procaryote<\/span>\n\u00A0\u00A0\u00A0\nschema:about<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Thing\/magnetosome<\/a>> ; # Magn\u00E9tosome<\/span>\n\u00A0\u00A0\u00A0\nschema:about<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Topic\/magnetite<\/a>> ; # Magn\u00E9tite<\/span>\n\u00A0\u00A0\u00A0\nschema:about<\/a> <http:\/\/dewey.info\/class\/579\/<\/a>> ;\u00A0\u00A0\u00A0\nschema:about<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Topic\/mineralisation_biologie<\/a>> ; # Min\u00E9ralisation (biologie)<\/span>\n\u00A0\u00A0\u00A0\nschema:about<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Thing\/magnetotaxie<\/a>> ; # Magn\u00E9totaxie<\/span>\n\u00A0\u00A0\u00A0\nschema:about<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Thing\/biomineralisation<\/a>> ; # Biomin\u00E9ralisation<\/span>\n\u00A0\u00A0\u00A0\nschema:author<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Person\/descamps_elodie_1990<\/a>> ; # Elodie Descamps<\/span>\n\u00A0\u00A0\u00A0\nschema:contributor<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Person\/medigue_claudine<\/a>> ; # Claudine M\u00E9digue<\/span>\n\u00A0\u00A0\u00A0\nschema:contributor<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Organization\/aix_marseille_universite<\/a>> ; # Aix-Marseille Universit\u00E9.<\/span>\n\u00A0\u00A0\u00A0\nschema:contributor<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Organization\/institut_de_biosciences_et_biotechnologies_d_aix_marseille_biam<\/a>> ; # Institut de biosciences et biotechnologies d\'Aix-Marseille (BIAM).<\/span>\n\u00A0\u00A0\u00A0\nschema:contributor<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Person\/michotey_valerie_19<\/a>> ; # Val\u00E9rie Michotey<\/span>\n\u00A0\u00A0\u00A0\nschema:contributor<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Person\/faivre_damien<\/a>> ; # Damien Faivre<\/span>\n\u00A0\u00A0\u00A0\nschema:contributor<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Person\/pignol_david_19_20<\/a>> ; # David Pignol<\/span>\n\u00A0\u00A0\u00A0\nschema:contributor<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Person\/lefevre_christopher_1980<\/a>> ; # Christopher Lefevre<\/span>\n\u00A0\u00A0\u00A0\nschema:contributor<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Person\/dolla_alain<\/a>> ; # Alain Dolla<\/span>\n\u00A0\u00A0\u00A0\nschema:contributor<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Organization\/ecole_doctorale_sciences_de_la_vie_et_de_la_sante_marseille<\/a>> ; # Ecole Doctorale Sciences de la Vie et de la Sant\u00E9 (Marseille).<\/span>\n\u00A0\u00A0\u00A0\nschema:contributor<\/a> <http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Person\/benzerara_karim_1976<\/a>> ; # Karim Benzerara<\/span>\n\u00A0\u00A0\u00A0\nschema:datePublished<\/a> \"2018<\/span>\" ;\u00A0\u00A0\u00A0\nschema:description<\/a> \"Les bact\u00E9ries magn\u00E9totactiques repr\u00E9sentent un groupe d\'une grande diversit\u00E9 \u00E9cologique et phylog\u00E9n\u00E9tique. Elles sont capables de biomin\u00E9raliser des nanocristaux de magn\u00E9tite [un oxyde de fer (Fe(II)Fe(III)2O4)] ou de greigite [un sulfure de fer (Fe(II)Fe(III)2S4)] dans leurs magn\u00E9tosomes, organites align\u00E9s en cha\u00EEnes permettant la navigation le long des lignes de champ magn\u00E9tique terrestre. Jusqu\'\u00E0 r\u00E9cemment, seules des souches produisant de la magn\u00E9tite \u00E9taient disponibles en culture pure, conduisant \u00E0 des \u00E9tudes sur les m\u00E9canismes de biomin\u00E9ralisation de cet oxyde de fer. En 2011, une nouvelle bact\u00E9rie capable de former de la magn\u00E9tite et de la greigite, Desulfamplus magnetovallimortis souche BW-1, a \u00E9t\u00E9 cultiv\u00E9e avec succ\u00E8s en laboratoire. Dans cette th\u00E8se, nous proposons d\'utiliser une approche int\u00E9gr\u00E9e et multidisciplinaire pour comprendre les m\u00E9canismes de biomin\u00E9ralisation de la greigite en utilisant comme mod\u00E8le d\'\u00E9tude la souche BW-1. Nous avons donc cherch\u00E9 \u00E0 d\u00E9terminer les conditions environnementales et biologiques favorisant la formation de la magn\u00E9tite et de la greigite. Ces travaux ont \u00E9galement conduit \u00E0 la caract\u00E9risation physiologique et phylog\u00E9n\u00E9tique de BW-1. Puis, l\'utilisation d\'approches globales et cibl\u00E9es de transcriptomique ont permis d\'\u00E9valuer le taux d\'expression des g\u00E8nes impliqu\u00E9s dans la formation des magn\u00E9tosomes (magn\u00E9tite vs. greigite) dans diverses conditions de croissance. Une approche de prot\u00E9omique a permis d\'apporter des informations suppl\u00E9mentaires \u00E0 cette \u00E9tude. Ces r\u00E9sultats ont permis de progresser dans la compr\u00E9hension fondamentale de la biomin\u00E9ralisation in vivo, en particulier pour des bact\u00E9ries formant de la greigite.<\/span>\"@fr<\/a> ;\u00A0\u00A0\u00A0\nschema:description<\/a> \"Magnetotactic bacteria represent a phylogenetically and ecologically diverse group of prokaryotes able to biomineralize magnetic nanocrystals composed of magnetite [an iron oxide (Fe(II)Fe(III)2O4)] or greigite [an iron sulfide (Fe(II)Fe(III)2S4)] in their magnetosomes, a prokaryotic organelle whose cytoplasmic alignement in chain allows the cell to navigate along the Earth\'s magnetic field lines. Until recently, only magnetite-producing strains were available in pure culture. Thus, only the magnetite biomineralization has been studied. In 2011, a new bacterium able to form both magnetite and greigite, Desulfamplus magnetovallimortis strain BW-1, was isolated from Death Valley, California and cultivated in pure culture. In this work, we propose to use an integrated and multidisciplinary approach to understand the mechanisms involved in greigite biomineralization in BW-1 strain. First, we determined the environmental and biological conditions in which magnetite and greigite are formed. This first part of my thesis also contributed to the physiologic and phylogenetic characterization of this bacterium. Secondly, we used global and targeted transcriptomic approaches to evaluate the transcription levels of genes putatively involved in magnetosomes formation (magnetite vs. greigite) under various growth conditions. 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<http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Person\/pignol_david_19_20<\/a>> # David Pignol<\/span>\n\u00A0\u00A0\u00A0\u00A0a \nschema:Person<\/a> ;\u00A0\u00A0\u00A0\nschema:birthDate<\/a> \"19..<\/span>\" ;\u00A0\u00A0\u00A0\nschema:deathDate<\/a> \"20<\/span>\" ;\u00A0\u00A0\u00A0\nschema:familyName<\/a> \"Pignol<\/span>\" ;\u00A0\u00A0\u00A0\nschema:givenName<\/a> \"David<\/span>\" ;\u00A0\u00A0\u00A0\nschema:name<\/a> \"David Pignol<\/span>\" ;\u00A0\u00A0\u00A0\u00A0.\n\n\n<\/div>\n
<http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Thing\/bacteries_magnetotactiques<\/a>> # Bact\u00E9ries magn\u00E9totactiques<\/span>\n\u00A0\u00A0\u00A0\u00A0a \nschema:Thing<\/a> ;\u00A0\u00A0\u00A0\nschema:name<\/a> \"Bact\u00E9ries magn\u00E9totactiques<\/span>\" ;\u00A0\u00A0\u00A0\u00A0.\n\n\n<\/div>\n
<http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Thing\/biomineralisation<\/a>> # Biomin\u00E9ralisation<\/span>\n\u00A0\u00A0\u00A0\u00A0a \nschema:Thing<\/a> ;\u00A0\u00A0\u00A0\nschema:name<\/a> \"Biomin\u00E9ralisation<\/span>\" ;\u00A0\u00A0\u00A0\u00A0.\n\n\n<\/div>\n
<http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Thing\/greigite<\/a>> # Greigite<\/span>\n\u00A0\u00A0\u00A0\u00A0a \nschema:Thing<\/a> ;\u00A0\u00A0\u00A0\nschema:name<\/a> \"Greigite<\/span>\" ;\u00A0\u00A0\u00A0\u00A0.\n\n\n<\/div>\n
<http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Thing\/magnetosome<\/a>> # Magn\u00E9tosome<\/span>\n\u00A0\u00A0\u00A0\u00A0a \nschema:Thing<\/a> ;\u00A0\u00A0\u00A0\nschema:name<\/a> \"Magn\u00E9tosome<\/span>\" ;\u00A0\u00A0\u00A0\u00A0.\n\n\n<\/div>\n
<http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Thing\/magnetotaxie<\/a>> # Magn\u00E9totaxie<\/span>\n\u00A0\u00A0\u00A0\u00A0a \nschema:Thing<\/a> ;\u00A0\u00A0\u00A0\nschema:name<\/a> \"Magn\u00E9totaxie<\/span>\" ;\u00A0\u00A0\u00A0\u00A0.\n\n\n<\/div>\n
<http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Thing\/organite_procaryote<\/a>> # Organite procaryote<\/span>\n\u00A0\u00A0\u00A0\u00A0a \nschema:Thing<\/a> ;\u00A0\u00A0\u00A0\nschema:name<\/a> \"Organite procaryote<\/span>\" ;\u00A0\u00A0\u00A0\u00A0.\n\n\n<\/div>\n
<http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Topic\/magnetite<\/a>> # Magn\u00E9tite<\/span>\n\u00A0\u00A0\u00A0\u00A0a \nschema:Intangible<\/a> ;\u00A0\u00A0\u00A0\nschema:name<\/a> \"Magn\u00E9tite<\/span>\"@fr<\/a> ;\u00A0\u00A0\u00A0\u00A0.\n\n\n<\/div>\n
<http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Topic\/magnetosomes<\/a>> # Magn\u00E9tosomes<\/span>\n\u00A0\u00A0\u00A0\u00A0a \nschema:Intangible<\/a> ;\u00A0\u00A0\u00A0\nschema:name<\/a> \"Magn\u00E9tosomes<\/span>\"@fr<\/a> ;\u00A0\u00A0\u00A0\u00A0.\n\n\n<\/div>\n
<http:\/\/experiment.worldcat.org\/entity\/work\/data\/5480568313#Topic\/mineralisation_biologie<\/a>> # Min\u00E9ralisation (biologie)<\/span>\n\u00A0\u00A0\u00A0\u00A0a \nschema:Intangible<\/a> ;\u00A0\u00A0\u00A0\nschema:name<\/a> \"Min\u00E9ralisation (biologie)<\/span>\"@fr<\/a> ;\u00A0\u00A0\u00A0\u00A0.\n\n\n<\/div>\n
<http:\/\/id.loc.gov\/vocabulary\/countries\/fr<\/a>>\u00A0\u00A0\u00A0\u00A0a \nschema:Place<\/a> ;\u00A0\u00A0\u00A0\ndcterms:identifier<\/a> \"fr<\/span>\" ;\u00A0\u00A0\u00A0\u00A0.\n\n\n<\/div>\n
<http:\/\/www.theses.fr\/2018AIXM0057\/document<\/a>>\u00A0\u00A0\u00A0\nrdfs:comment<\/a> \"Acc\u00E8s au texte int\u00E9gral<\/span>\" ;\u00A0\u00A0\u00A0\u00A0.\n\n\n<\/div>\n
<http:\/\/www.worldcat.org\/title\/-\/oclc\/1056626945<\/a>>\u00A0\u00A0\u00A0\u00A0a \ngenont:InformationResource<\/a>, genont:ContentTypeGenericResource<\/a> ;\u00A0\u00A0\u00A0\nschema:about<\/a> <http:\/\/www.worldcat.org\/oclc\/1056626945<\/a>> ; # Greigite et magn\u00E9tite : les d\u00E9terminants environnementaux et g\u00E9n\u00E9tiques contr\u00F4lant la biomin\u00E9ralisation chez les bact\u00E9ries magn\u00E9totactiques<\/span>\n\u00A0\u00A0\u00A0\nschema:dateModified<\/a> \"2020-10-05<\/span>\" ;\u00A0\u00A0\u00A0\nvoid:inDataset<\/a> <http:\/\/purl.oclc.org\/dataset\/WorldCat<\/a>> ;\u00A0\u00A0\u00A0\u00A0.\n\n\n<\/div>\n\n

Content-negotiable representations<\/p>\n