ExoS/ChvI two-component signal-transduction system activated in the absence of bacterial phosphatidylcholine
- Autores
- Geiger, Otto; Sohlenkamp, Christian; Vera-Cruz, Diana; Medeot, Daniela Beatriz; Martínez-Aguilar, Lourdes; Sahonero-Canavesi, Diana X.; Weidner, Stefan; Pühler, Alfred; López Lara, Isabel M.
- Año de publicación
- 2021
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Sinorhizobium meliloti contains the negatively charged phosphatidylglycerol and cardiolipin as well as the zwitterionic phosphatidylethanolamine (PE) and phosphatidylcholine (PC) as major membrane phospholipids. In previous studies we had isolated S. meliloti mutants that lack PE or PC. Although mutants deficient in PE are able to form nitrogen-fixing nodules on alfalfa host plants, mutants lacking PC cannot sustain development of any nodules on host roots. Transcript profiles of mutants unable to form PE or PC are distinct; they differ from each other and they are different from the wild type profile. For example, a PC-deficient mutant of S. meliloti shows an increase of transcripts that encode enzymes required for succinoglycan biosynthesis and a decrease of transcripts required for flagellum formation. Indeed, a PC-deficient mutant is unable to swim and overproduces succinoglycan. Some suppressor mutants, that regain swimming and form normal levels of succinoglycan, are altered in the ExoS sensor. Our findings suggest that the lack of PC in the sinorhizobial membrane activates the ExoS/ChvI two-component regulatory system. ExoS/ChvI constitute a molecular switch in S. meliloti for changing from a free-living to a symbiotic life style. The periplasmic repressor protein ExoR controls ExoS/ChvI function and it is thought that proteolytic ExoR degradation would relieve repression of ExoS/ChvI thereby switching on this system. However, as ExoR levels are similar in wild type, PC-deficient mutant and suppressor mutants, we propose that lack of PC in the bacterial membrane provokes directly a conformational change of the ExoS sensor and thereby activation of the ExoS/ChvI two-component system.
Fil: Geiger, Otto. Universidad Nacional Autónoma de México; México
Fil: Sohlenkamp, Christian. Universidad Nacional Autónoma de México; México
Fil: Vera-Cruz, Diana. Universidad Nacional Autónoma de México; México
Fil: Medeot, Daniela Beatriz. Universidad Nacional Autónoma de México; México. Universidad Nacional de Rio Cuarto. Facultad de Cs.exactas Fisicoquimicas y Naturales. Instituto de Biotecnologia Ambiental y Salud. - Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Cordoba. Instituto de Biotecnologia Ambiental y Salud.; Argentina
Fil: Martínez-Aguilar, Lourdes. Universidad Nacional Autónoma de México; México
Fil: Sahonero-Canavesi, Diana X.. Universidad Nacional Autónoma de México; México
Fil: Weidner, Stefan. Universitaet Biehlefeld; Alemania
Fil: Pühler, Alfred. Universitaet Biehlefeld; Alemania
Fil: López Lara, Isabel M.. Universidad Nacional Autónoma de México; México - Materia
-
MEMBRANE LIPID
MOTILITY
PHOSPHATIDYLETHANOLAMINE
SINORHIZOBIUM MELILOTI
SUCCINOGLYCAN
SYMBIOSIS - 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:11336/181484
Ver los metadatos del registro completo
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CONICET Digital (CONICET) |
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ExoS/ChvI two-component signal-transduction system activated in the absence of bacterial phosphatidylcholineGeiger, OttoSohlenkamp, ChristianVera-Cruz, DianaMedeot, Daniela BeatrizMartínez-Aguilar, LourdesSahonero-Canavesi, Diana X.Weidner, StefanPühler, AlfredLópez Lara, Isabel M.MEMBRANE LIPIDMOTILITYPHOSPHATIDYLETHANOLAMINESINORHIZOBIUM MELILOTISUCCINOGLYCANSYMBIOSIShttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Sinorhizobium meliloti contains the negatively charged phosphatidylglycerol and cardiolipin as well as the zwitterionic phosphatidylethanolamine (PE) and phosphatidylcholine (PC) as major membrane phospholipids. In previous studies we had isolated S. meliloti mutants that lack PE or PC. Although mutants deficient in PE are able to form nitrogen-fixing nodules on alfalfa host plants, mutants lacking PC cannot sustain development of any nodules on host roots. Transcript profiles of mutants unable to form PE or PC are distinct; they differ from each other and they are different from the wild type profile. For example, a PC-deficient mutant of S. meliloti shows an increase of transcripts that encode enzymes required for succinoglycan biosynthesis and a decrease of transcripts required for flagellum formation. Indeed, a PC-deficient mutant is unable to swim and overproduces succinoglycan. Some suppressor mutants, that regain swimming and form normal levels of succinoglycan, are altered in the ExoS sensor. Our findings suggest that the lack of PC in the sinorhizobial membrane activates the ExoS/ChvI two-component regulatory system. ExoS/ChvI constitute a molecular switch in S. meliloti for changing from a free-living to a symbiotic life style. The periplasmic repressor protein ExoR controls ExoS/ChvI function and it is thought that proteolytic ExoR degradation would relieve repression of ExoS/ChvI thereby switching on this system. However, as ExoR levels are similar in wild type, PC-deficient mutant and suppressor mutants, we propose that lack of PC in the bacterial membrane provokes directly a conformational change of the ExoS sensor and thereby activation of the ExoS/ChvI two-component system.Fil: Geiger, Otto. Universidad Nacional Autónoma de México; MéxicoFil: Sohlenkamp, Christian. Universidad Nacional Autónoma de México; MéxicoFil: Vera-Cruz, Diana. Universidad Nacional Autónoma de México; MéxicoFil: Medeot, Daniela Beatriz. Universidad Nacional Autónoma de México; México. Universidad Nacional de Rio Cuarto. Facultad de Cs.exactas Fisicoquimicas y Naturales. Instituto de Biotecnologia Ambiental y Salud. - Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Cordoba. Instituto de Biotecnologia Ambiental y Salud.; ArgentinaFil: Martínez-Aguilar, Lourdes. Universidad Nacional Autónoma de México; MéxicoFil: Sahonero-Canavesi, Diana X.. Universidad Nacional Autónoma de México; MéxicoFil: Weidner, Stefan. Universitaet Biehlefeld; AlemaniaFil: Pühler, Alfred. Universitaet Biehlefeld; AlemaniaFil: López Lara, Isabel M.. Universidad Nacional Autónoma de México; MéxicoFrontiers Media S.A.2021-07-23info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/181484Geiger, Otto; Sohlenkamp, Christian; Vera-Cruz, Diana; Medeot, Daniela Beatriz; Martínez-Aguilar, Lourdes; et al.; ExoS/ChvI two-component signal-transduction system activated in the absence of bacterial phosphatidylcholine; Frontiers Media S.A.; Frontiers in Plant Science; 12; 23-7-2021; 1-201664-462XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.frontiersin.org/articles/10.3389/fpls.2021.678976/fullinfo:eu-repo/semantics/altIdentifier/doi/10.3389/fpls.2021.678976info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:07:08Zoai:ri.conicet.gov.ar:11336/181484instacron: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:34982025-09-29 10:07:09.021CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
ExoS/ChvI two-component signal-transduction system activated in the absence of bacterial phosphatidylcholine |
title |
ExoS/ChvI two-component signal-transduction system activated in the absence of bacterial phosphatidylcholine |
spellingShingle |
ExoS/ChvI two-component signal-transduction system activated in the absence of bacterial phosphatidylcholine Geiger, Otto MEMBRANE LIPID MOTILITY PHOSPHATIDYLETHANOLAMINE SINORHIZOBIUM MELILOTI SUCCINOGLYCAN SYMBIOSIS |
title_short |
ExoS/ChvI two-component signal-transduction system activated in the absence of bacterial phosphatidylcholine |
title_full |
ExoS/ChvI two-component signal-transduction system activated in the absence of bacterial phosphatidylcholine |
title_fullStr |
ExoS/ChvI two-component signal-transduction system activated in the absence of bacterial phosphatidylcholine |
title_full_unstemmed |
ExoS/ChvI two-component signal-transduction system activated in the absence of bacterial phosphatidylcholine |
title_sort |
ExoS/ChvI two-component signal-transduction system activated in the absence of bacterial phosphatidylcholine |
dc.creator.none.fl_str_mv |
Geiger, Otto Sohlenkamp, Christian Vera-Cruz, Diana Medeot, Daniela Beatriz Martínez-Aguilar, Lourdes Sahonero-Canavesi, Diana X. Weidner, Stefan Pühler, Alfred López Lara, Isabel M. |
author |
Geiger, Otto |
author_facet |
Geiger, Otto Sohlenkamp, Christian Vera-Cruz, Diana Medeot, Daniela Beatriz Martínez-Aguilar, Lourdes Sahonero-Canavesi, Diana X. Weidner, Stefan Pühler, Alfred López Lara, Isabel M. |
author_role |
author |
author2 |
Sohlenkamp, Christian Vera-Cruz, Diana Medeot, Daniela Beatriz Martínez-Aguilar, Lourdes Sahonero-Canavesi, Diana X. Weidner, Stefan Pühler, Alfred López Lara, Isabel M. |
author2_role |
author author author author author author author author |
dc.subject.none.fl_str_mv |
MEMBRANE LIPID MOTILITY PHOSPHATIDYLETHANOLAMINE SINORHIZOBIUM MELILOTI SUCCINOGLYCAN SYMBIOSIS |
topic |
MEMBRANE LIPID MOTILITY PHOSPHATIDYLETHANOLAMINE SINORHIZOBIUM MELILOTI SUCCINOGLYCAN SYMBIOSIS |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
Sinorhizobium meliloti contains the negatively charged phosphatidylglycerol and cardiolipin as well as the zwitterionic phosphatidylethanolamine (PE) and phosphatidylcholine (PC) as major membrane phospholipids. In previous studies we had isolated S. meliloti mutants that lack PE or PC. Although mutants deficient in PE are able to form nitrogen-fixing nodules on alfalfa host plants, mutants lacking PC cannot sustain development of any nodules on host roots. Transcript profiles of mutants unable to form PE or PC are distinct; they differ from each other and they are different from the wild type profile. For example, a PC-deficient mutant of S. meliloti shows an increase of transcripts that encode enzymes required for succinoglycan biosynthesis and a decrease of transcripts required for flagellum formation. Indeed, a PC-deficient mutant is unable to swim and overproduces succinoglycan. Some suppressor mutants, that regain swimming and form normal levels of succinoglycan, are altered in the ExoS sensor. Our findings suggest that the lack of PC in the sinorhizobial membrane activates the ExoS/ChvI two-component regulatory system. ExoS/ChvI constitute a molecular switch in S. meliloti for changing from a free-living to a symbiotic life style. The periplasmic repressor protein ExoR controls ExoS/ChvI function and it is thought that proteolytic ExoR degradation would relieve repression of ExoS/ChvI thereby switching on this system. However, as ExoR levels are similar in wild type, PC-deficient mutant and suppressor mutants, we propose that lack of PC in the bacterial membrane provokes directly a conformational change of the ExoS sensor and thereby activation of the ExoS/ChvI two-component system. Fil: Geiger, Otto. Universidad Nacional Autónoma de México; México Fil: Sohlenkamp, Christian. Universidad Nacional Autónoma de México; México Fil: Vera-Cruz, Diana. Universidad Nacional Autónoma de México; México Fil: Medeot, Daniela Beatriz. Universidad Nacional Autónoma de México; México. Universidad Nacional de Rio Cuarto. Facultad de Cs.exactas Fisicoquimicas y Naturales. Instituto de Biotecnologia Ambiental y Salud. - Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Cordoba. Instituto de Biotecnologia Ambiental y Salud.; Argentina Fil: Martínez-Aguilar, Lourdes. Universidad Nacional Autónoma de México; México Fil: Sahonero-Canavesi, Diana X.. Universidad Nacional Autónoma de México; México Fil: Weidner, Stefan. Universitaet Biehlefeld; Alemania Fil: Pühler, Alfred. Universitaet Biehlefeld; Alemania Fil: López Lara, Isabel M.. Universidad Nacional Autónoma de México; México |
description |
Sinorhizobium meliloti contains the negatively charged phosphatidylglycerol and cardiolipin as well as the zwitterionic phosphatidylethanolamine (PE) and phosphatidylcholine (PC) as major membrane phospholipids. In previous studies we had isolated S. meliloti mutants that lack PE or PC. Although mutants deficient in PE are able to form nitrogen-fixing nodules on alfalfa host plants, mutants lacking PC cannot sustain development of any nodules on host roots. Transcript profiles of mutants unable to form PE or PC are distinct; they differ from each other and they are different from the wild type profile. For example, a PC-deficient mutant of S. meliloti shows an increase of transcripts that encode enzymes required for succinoglycan biosynthesis and a decrease of transcripts required for flagellum formation. Indeed, a PC-deficient mutant is unable to swim and overproduces succinoglycan. Some suppressor mutants, that regain swimming and form normal levels of succinoglycan, are altered in the ExoS sensor. Our findings suggest that the lack of PC in the sinorhizobial membrane activates the ExoS/ChvI two-component regulatory system. ExoS/ChvI constitute a molecular switch in S. meliloti for changing from a free-living to a symbiotic life style. The periplasmic repressor protein ExoR controls ExoS/ChvI function and it is thought that proteolytic ExoR degradation would relieve repression of ExoS/ChvI thereby switching on this system. However, as ExoR levels are similar in wild type, PC-deficient mutant and suppressor mutants, we propose that lack of PC in the bacterial membrane provokes directly a conformational change of the ExoS sensor and thereby activation of the ExoS/ChvI two-component system. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-07-23 |
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/11336/181484 Geiger, Otto; Sohlenkamp, Christian; Vera-Cruz, Diana; Medeot, Daniela Beatriz; Martínez-Aguilar, Lourdes; et al.; ExoS/ChvI two-component signal-transduction system activated in the absence of bacterial phosphatidylcholine; Frontiers Media S.A.; Frontiers in Plant Science; 12; 23-7-2021; 1-20 1664-462X CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/181484 |
identifier_str_mv |
Geiger, Otto; Sohlenkamp, Christian; Vera-Cruz, Diana; Medeot, Daniela Beatriz; Martínez-Aguilar, Lourdes; et al.; ExoS/ChvI two-component signal-transduction system activated in the absence of bacterial phosphatidylcholine; Frontiers Media S.A.; Frontiers in Plant Science; 12; 23-7-2021; 1-20 1664-462X CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/url/https://www.frontiersin.org/articles/10.3389/fpls.2021.678976/full info:eu-repo/semantics/altIdentifier/doi/10.3389/fpls.2021.678976 |
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 |
Frontiers Media S.A. |
publisher.none.fl_str_mv |
Frontiers Media S.A. |
dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
reponame_str |
CONICET Digital (CONICET) |
collection |
CONICET Digital (CONICET) |
instname_str |
Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.name.fl_str_mv |
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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1844613928233992192 |
score |
13.070432 |