Dissecting the role of NtrC and RpoN in the expression of assimilatory nitrate and nitrite reductases in Bradyrhizobium diazoefficiens
- Autores
- López, María Florencia; Cabrera, Juan J.; Salas, Ana; Delgado, María J.; Lopez Garcia, Silvina Laura
- Año de publicación
- 2016
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Bradyrhizobium diazoefficiens, the nitrogen-fixing endosymbiont of soybeans, is a model strain for studying rhizobial denitrification. This bacterium can also uses nitrate as the sole nitrogen (N) source during aerobic growth by inducing an assimilatory nitrate reductase encoded by nasC located within the narK-bjgb-flp-nasC operon along with a nitrite reductase encoded by nirA at a different chromosomal locus. The global nitrogen two-component regulatory system NtrBC has been reported to coordinate the expression of key enzymes in nitrogen metabolism in several bacteria. In this study, we demonstrate that disruption of ntrC caused a growth defect in B. diazoefficiens cells in the presence of nitrate or nitrite as the sole N- source and a decreased activity of the nitrate and nitrite reductase enzymes. Furthermore, the expression of narK-lacZ or nirA-lacZ transcriptional fusions was significantly reduced in the ntrC mutant after incubation under nitrate assimilation conditions. A B. diazoefficiens rpoN1/2 mutant, lacking both copies of the gene encoding the alternative sigma factor 54, was also defective in aerobic growth with nitrate as the N- source as well as in nitrate and nitrite reductase expression. These results demonstrate that the NtrC regulator is required for expression of the B. diazoefficiens nasC and nirA genes and that the sigma factor RpoN is also involved in this regulation.
Fil: López, María Florencia. 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
Fil: Cabrera, Juan J.. Consejo Superior de Investigaciones Científicas; España
Fil: Salas, Ana. Consejo Superior de Investigaciones Científicas; España
Fil: Delgado, María J.. Consejo Superior de Investigaciones Científicas; España
Fil: Lopez Garcia, Silvina Laura. 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 - Materia
-
Bradyrhizobium Diazoefficiens
Two-Component-Regulatory System
Nitrate/ Nitrite Assimilation
Nitrate /Nitrite Reductases - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/47934
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Dissecting the role of NtrC and RpoN in the expression of assimilatory nitrate and nitrite reductases in Bradyrhizobium diazoefficiensLópez, María FlorenciaCabrera, Juan J.Salas, AnaDelgado, María J.Lopez Garcia, Silvina LauraBradyrhizobium DiazoefficiensTwo-Component-Regulatory SystemNitrate/ Nitrite AssimilationNitrate /Nitrite Reductaseshttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Bradyrhizobium diazoefficiens, the nitrogen-fixing endosymbiont of soybeans, is a model strain for studying rhizobial denitrification. This bacterium can also uses nitrate as the sole nitrogen (N) source during aerobic growth by inducing an assimilatory nitrate reductase encoded by nasC located within the narK-bjgb-flp-nasC operon along with a nitrite reductase encoded by nirA at a different chromosomal locus. The global nitrogen two-component regulatory system NtrBC has been reported to coordinate the expression of key enzymes in nitrogen metabolism in several bacteria. In this study, we demonstrate that disruption of ntrC caused a growth defect in B. diazoefficiens cells in the presence of nitrate or nitrite as the sole N- source and a decreased activity of the nitrate and nitrite reductase enzymes. Furthermore, the expression of narK-lacZ or nirA-lacZ transcriptional fusions was significantly reduced in the ntrC mutant after incubation under nitrate assimilation conditions. A B. diazoefficiens rpoN1/2 mutant, lacking both copies of the gene encoding the alternative sigma factor 54, was also defective in aerobic growth with nitrate as the N- source as well as in nitrate and nitrite reductase expression. These results demonstrate that the NtrC regulator is required for expression of the B. diazoefficiens nasC and nirA genes and that the sigma factor RpoN is also involved in this regulation.Fil: López, María Florencia. 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; ArgentinaFil: Cabrera, Juan J.. Consejo Superior de Investigaciones Científicas; EspañaFil: Salas, Ana. Consejo Superior de Investigaciones Científicas; EspañaFil: Delgado, María J.. Consejo Superior de Investigaciones Científicas; EspañaFil: Lopez Garcia, Silvina Laura. 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; ArgentinaSpringer2016-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/47934López, María Florencia; Cabrera, Juan J.; Salas, Ana; Delgado, María J.; Lopez Garcia, Silvina Laura; Dissecting the role of NtrC and RpoN in the expression of assimilatory nitrate and nitrite reductases in Bradyrhizobium diazoefficiens; Springer; Antonie van Leeuwenhoek; 110; 4; 12-2016; 531-5420003-6072CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1007/s10482-016-0821-3info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs10482-016-0821-3info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:59:35Zoai:ri.conicet.gov.ar:11336/47934instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 09:59:36.169CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Dissecting the role of NtrC and RpoN in the expression of assimilatory nitrate and nitrite reductases in Bradyrhizobium diazoefficiens |
title |
Dissecting the role of NtrC and RpoN in the expression of assimilatory nitrate and nitrite reductases in Bradyrhizobium diazoefficiens |
spellingShingle |
Dissecting the role of NtrC and RpoN in the expression of assimilatory nitrate and nitrite reductases in Bradyrhizobium diazoefficiens López, María Florencia Bradyrhizobium Diazoefficiens Two-Component-Regulatory System Nitrate/ Nitrite Assimilation Nitrate /Nitrite Reductases |
title_short |
Dissecting the role of NtrC and RpoN in the expression of assimilatory nitrate and nitrite reductases in Bradyrhizobium diazoefficiens |
title_full |
Dissecting the role of NtrC and RpoN in the expression of assimilatory nitrate and nitrite reductases in Bradyrhizobium diazoefficiens |
title_fullStr |
Dissecting the role of NtrC and RpoN in the expression of assimilatory nitrate and nitrite reductases in Bradyrhizobium diazoefficiens |
title_full_unstemmed |
Dissecting the role of NtrC and RpoN in the expression of assimilatory nitrate and nitrite reductases in Bradyrhizobium diazoefficiens |
title_sort |
Dissecting the role of NtrC and RpoN in the expression of assimilatory nitrate and nitrite reductases in Bradyrhizobium diazoefficiens |
dc.creator.none.fl_str_mv |
López, María Florencia Cabrera, Juan J. Salas, Ana Delgado, María J. Lopez Garcia, Silvina Laura |
author |
López, María Florencia |
author_facet |
López, María Florencia Cabrera, Juan J. Salas, Ana Delgado, María J. Lopez Garcia, Silvina Laura |
author_role |
author |
author2 |
Cabrera, Juan J. Salas, Ana Delgado, María J. Lopez Garcia, Silvina Laura |
author2_role |
author author author author |
dc.subject.none.fl_str_mv |
Bradyrhizobium Diazoefficiens Two-Component-Regulatory System Nitrate/ Nitrite Assimilation Nitrate /Nitrite Reductases |
topic |
Bradyrhizobium Diazoefficiens Two-Component-Regulatory System Nitrate/ Nitrite Assimilation Nitrate /Nitrite Reductases |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
Bradyrhizobium diazoefficiens, the nitrogen-fixing endosymbiont of soybeans, is a model strain for studying rhizobial denitrification. This bacterium can also uses nitrate as the sole nitrogen (N) source during aerobic growth by inducing an assimilatory nitrate reductase encoded by nasC located within the narK-bjgb-flp-nasC operon along with a nitrite reductase encoded by nirA at a different chromosomal locus. The global nitrogen two-component regulatory system NtrBC has been reported to coordinate the expression of key enzymes in nitrogen metabolism in several bacteria. In this study, we demonstrate that disruption of ntrC caused a growth defect in B. diazoefficiens cells in the presence of nitrate or nitrite as the sole N- source and a decreased activity of the nitrate and nitrite reductase enzymes. Furthermore, the expression of narK-lacZ or nirA-lacZ transcriptional fusions was significantly reduced in the ntrC mutant after incubation under nitrate assimilation conditions. A B. diazoefficiens rpoN1/2 mutant, lacking both copies of the gene encoding the alternative sigma factor 54, was also defective in aerobic growth with nitrate as the N- source as well as in nitrate and nitrite reductase expression. These results demonstrate that the NtrC regulator is required for expression of the B. diazoefficiens nasC and nirA genes and that the sigma factor RpoN is also involved in this regulation. Fil: López, María Florencia. 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 Fil: Cabrera, Juan J.. Consejo Superior de Investigaciones Científicas; España Fil: Salas, Ana. Consejo Superior de Investigaciones Científicas; España Fil: Delgado, María J.. Consejo Superior de Investigaciones Científicas; España Fil: Lopez Garcia, Silvina Laura. 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 |
description |
Bradyrhizobium diazoefficiens, the nitrogen-fixing endosymbiont of soybeans, is a model strain for studying rhizobial denitrification. This bacterium can also uses nitrate as the sole nitrogen (N) source during aerobic growth by inducing an assimilatory nitrate reductase encoded by nasC located within the narK-bjgb-flp-nasC operon along with a nitrite reductase encoded by nirA at a different chromosomal locus. The global nitrogen two-component regulatory system NtrBC has been reported to coordinate the expression of key enzymes in nitrogen metabolism in several bacteria. In this study, we demonstrate that disruption of ntrC caused a growth defect in B. diazoefficiens cells in the presence of nitrate or nitrite as the sole N- source and a decreased activity of the nitrate and nitrite reductase enzymes. Furthermore, the expression of narK-lacZ or nirA-lacZ transcriptional fusions was significantly reduced in the ntrC mutant after incubation under nitrate assimilation conditions. A B. diazoefficiens rpoN1/2 mutant, lacking both copies of the gene encoding the alternative sigma factor 54, was also defective in aerobic growth with nitrate as the N- source as well as in nitrate and nitrite reductase expression. These results demonstrate that the NtrC regulator is required for expression of the B. diazoefficiens nasC and nirA genes and that the sigma factor RpoN is also involved in this regulation. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-12 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/47934 López, María Florencia; Cabrera, Juan J.; Salas, Ana; Delgado, María J.; Lopez Garcia, Silvina Laura; Dissecting the role of NtrC and RpoN in the expression of assimilatory nitrate and nitrite reductases in Bradyrhizobium diazoefficiens; Springer; Antonie van Leeuwenhoek; 110; 4; 12-2016; 531-542 0003-6072 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/47934 |
identifier_str_mv |
López, María Florencia; Cabrera, Juan J.; Salas, Ana; Delgado, María J.; Lopez Garcia, Silvina Laura; Dissecting the role of NtrC and RpoN in the expression of assimilatory nitrate and nitrite reductases in Bradyrhizobium diazoefficiens; Springer; Antonie van Leeuwenhoek; 110; 4; 12-2016; 531-542 0003-6072 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s10482-016-0821-3 info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs10482-016-0821-3 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Springer |
publisher.none.fl_str_mv |
Springer |
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Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.mail.fl_str_mv |
dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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1842269589916876800 |
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13.13397 |