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dc.contributor.author
Quelas, Juan Ignacio
dc.contributor.author
Mesa, S.
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Mongiardini, Elias Javier
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Jendrossek, D.
dc.contributor.author
Lodeiro, Anibal
dc.date.available
2018-06-11T17:33:54Z
dc.date.issued
2016-07
dc.identifier.citation
Quelas, Juan Ignacio; Mesa, S.; Mongiardini, Elias Javier; Jendrossek, D.; Lodeiro, Anibal; Regulation of Polyhydroxybutyrate Synthesis in the Soil Bacterium Bradyrhizobium diazoefficiens; American Society for Microbiology; Applied And Environmental Microbiology; 82; 14; 7-2016; 4299-4308
dc.identifier.issn
0099-2240
dc.identifier.uri
http://hdl.handle.net/11336/48116
dc.description.abstract
Polyhydroxybutyrate (PHB) is a carbon and energy reserve polymer in various prokaryotic species. We determined that, when grown with mannitol as the sole carbon source, Bradyrhizobium diazoefficiens produces a homopolymer composed only of 3-hydroxybutyrate units (PHB). Conditions of oxygen limitation (such as microoxia, oxic stationary phase and bacteroids inside legume nodules) were permissive for the synthesis of PHB, which was observed as cytoplasmic granules. To study the regulation of PHB synthesis, we generated mutants in the regulator gene phaR and the phasin genes phaP1 and phaP4. Under permissive conditions, mutation of phaR impaired PHB accumulation, and a phaP1/phaP4 double mutant produced more PHB than the wildtype, which was accumulated in a single, large cytoplasmic granule. Moreover, PhaR negatively regulated the expression of phaP1 and phaP4 as well as of phaA1, phaA2 (3-ketoacyl-CoA thiolase), phaC1, phaC2 (PHB synthases), and fixK2 (CRP/FNR-type transcription regulator of genes for microoxic lifestyle). In addition to the depressed PHB cycling, phaR mutants accumulated more extracellular polysaccharide and promoted higher plant shoot dry weight and competitiveness for nodulation than the wildtype, by contrast to phaC1 mutant strains, defective in PHB synthesis. These results suggest that phaR not only regulates PHB granules formation by controlling the expression of phasins and biosynthetic enzymes, but also acts as global regulator of excess carbon allocation and symbiosis by controlling fixK2.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Society for Microbiology
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Polyhydroxybutyrate
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Bradyrhizobium
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Soybean
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Regulation
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Otras Ciencias Biológicas
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Ciencias Biológicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Regulation of Polyhydroxybutyrate Synthesis in the Soil Bacterium Bradyrhizobium diazoefficiens
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-06-08T14:29:04Z
dc.journal.volume
82
dc.journal.number
14
dc.journal.pagination
4299-4308
dc.journal.pais
Estados Unidos
dc.journal.ciudad
Washington
dc.description.fil
Fil: Quelas, Juan Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Biotecnología y Biología Molecular. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Biotecnología y Biología Molecular; Argentina
dc.description.fil
Fil: Mesa, S.. Consejo Superior de Investigaciones Científicas; España
dc.description.fil
Fil: Mongiardini, Elias Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Biotecnología y Biología Molecular. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Biotecnología y Biología Molecular; Argentina
dc.description.fil
Fil: Jendrossek, D.. University of Stuttgart; Alemania
dc.description.fil
Fil: Lodeiro, Anibal. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Biotecnología y Biología Molecular. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Biotecnología y Biología Molecular; Argentina
dc.journal.title
Applied And Environmental Microbiology
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://dx.doi.org/10.1128/AEM.00757-16
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://aem.asm.org/content/82/14/4299
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