The activity of the 20S proteasome is maintained in detached wheat leaves during senescence in darkness
- Autores
- Roberts, Irma; Fernandez Murray, Jorge Pedro; Passeron, Susana; Barneix, Atilio José
- Año de publicación
- 2002
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- In the present paper, we studied the participation of the 20S proteasome, the proteolytic component of the ubiquitin-proteasome pathway, in the remobilization of bulk proteins in senescing wheat leaves. The detached leaves of 15-d-old plants were incubated in darkness for several days, and various proteolytic activities were analysed in soluble extracts prepared at 0, 48 and 96 h after detachment. The endoproteolytic activity, measured at pH 7.5 and 5.4, increased more than 10-fold and the total peptidasic activity increased up to 5-fold after 96 h of incubation in the dark, when expressed as specific activity. In the same period, the leaf-protein content decreased to less than 50% of that present at the initial time. The 20S proteasome chymotrypsin-like activity remained constant when it was expressed as activity per leaf fresh weight and resulted 2-fold higher in terms of specific activity. The western blot analysis showed that the amount of 20S proteasome protein and ubiquitin-protein conjugates also remained constant until 4 d of incubation in darkness. These results indicate that the ubiquitin-proteasome pathway remains functional until the late phases of senescence suggesting that it may participate in the regulatory aspects of the process rather than in the massive protein breakdown.
Fil: Roberts, Irma. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales; Argentina
Fil: Fernandez Murray, Jorge Pedro. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales; Argentina
Fil: Passeron, Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales; Argentina
Fil: Barneix, Atilio José. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales; Argentina - Materia
-
20S PROTEASOME
PROTEOLYSIS
SENESCENCE
UBIQUITIN
WHEAT - 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:11336/148958
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CONICET Digital (CONICET) |
spelling |
The activity of the 20S proteasome is maintained in detached wheat leaves during senescence in darknessRoberts, IrmaFernandez Murray, Jorge PedroPasseron, SusanaBarneix, Atilio José20S PROTEASOMEPROTEOLYSISSENESCENCEUBIQUITINWHEAThttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1In the present paper, we studied the participation of the 20S proteasome, the proteolytic component of the ubiquitin-proteasome pathway, in the remobilization of bulk proteins in senescing wheat leaves. The detached leaves of 15-d-old plants were incubated in darkness for several days, and various proteolytic activities were analysed in soluble extracts prepared at 0, 48 and 96 h after detachment. The endoproteolytic activity, measured at pH 7.5 and 5.4, increased more than 10-fold and the total peptidasic activity increased up to 5-fold after 96 h of incubation in the dark, when expressed as specific activity. In the same period, the leaf-protein content decreased to less than 50% of that present at the initial time. The 20S proteasome chymotrypsin-like activity remained constant when it was expressed as activity per leaf fresh weight and resulted 2-fold higher in terms of specific activity. The western blot analysis showed that the amount of 20S proteasome protein and ubiquitin-protein conjugates also remained constant until 4 d of incubation in darkness. These results indicate that the ubiquitin-proteasome pathway remains functional until the late phases of senescence suggesting that it may participate in the regulatory aspects of the process rather than in the massive protein breakdown.Fil: Roberts, Irma. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales; ArgentinaFil: Fernandez Murray, Jorge Pedro. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales; ArgentinaFil: Passeron, Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales; ArgentinaFil: Barneix, Atilio José. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales; ArgentinaElsevier France-Editions Scientifiques Medicales Elsevier2002-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/148958Roberts, Irma; Fernandez Murray, Jorge Pedro; Passeron, Susana; Barneix, Atilio José; The activity of the 20S proteasome is maintained in detached wheat leaves during senescence in darkness; Elsevier France-Editions Scientifiques Medicales Elsevier; Plant Physiology and Biochemistry; 40; 2; 2-2002; 161-1660981-94281873-2690CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0981942801013493info:eu-repo/semantics/altIdentifier/doi/10.1016/s0981-9428(01)01349-3info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:31:12Zoai:ri.conicet.gov.ar:11336/148958instacron: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 10:31:13.14CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
The activity of the 20S proteasome is maintained in detached wheat leaves during senescence in darkness |
title |
The activity of the 20S proteasome is maintained in detached wheat leaves during senescence in darkness |
spellingShingle |
The activity of the 20S proteasome is maintained in detached wheat leaves during senescence in darkness Roberts, Irma 20S PROTEASOME PROTEOLYSIS SENESCENCE UBIQUITIN WHEAT |
title_short |
The activity of the 20S proteasome is maintained in detached wheat leaves during senescence in darkness |
title_full |
The activity of the 20S proteasome is maintained in detached wheat leaves during senescence in darkness |
title_fullStr |
The activity of the 20S proteasome is maintained in detached wheat leaves during senescence in darkness |
title_full_unstemmed |
The activity of the 20S proteasome is maintained in detached wheat leaves during senescence in darkness |
title_sort |
The activity of the 20S proteasome is maintained in detached wheat leaves during senescence in darkness |
dc.creator.none.fl_str_mv |
Roberts, Irma Fernandez Murray, Jorge Pedro Passeron, Susana Barneix, Atilio José |
author |
Roberts, Irma |
author_facet |
Roberts, Irma Fernandez Murray, Jorge Pedro Passeron, Susana Barneix, Atilio José |
author_role |
author |
author2 |
Fernandez Murray, Jorge Pedro Passeron, Susana Barneix, Atilio José |
author2_role |
author author author |
dc.subject.none.fl_str_mv |
20S PROTEASOME PROTEOLYSIS SENESCENCE UBIQUITIN WHEAT |
topic |
20S PROTEASOME PROTEOLYSIS SENESCENCE UBIQUITIN WHEAT |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
In the present paper, we studied the participation of the 20S proteasome, the proteolytic component of the ubiquitin-proteasome pathway, in the remobilization of bulk proteins in senescing wheat leaves. The detached leaves of 15-d-old plants were incubated in darkness for several days, and various proteolytic activities were analysed in soluble extracts prepared at 0, 48 and 96 h after detachment. The endoproteolytic activity, measured at pH 7.5 and 5.4, increased more than 10-fold and the total peptidasic activity increased up to 5-fold after 96 h of incubation in the dark, when expressed as specific activity. In the same period, the leaf-protein content decreased to less than 50% of that present at the initial time. The 20S proteasome chymotrypsin-like activity remained constant when it was expressed as activity per leaf fresh weight and resulted 2-fold higher in terms of specific activity. The western blot analysis showed that the amount of 20S proteasome protein and ubiquitin-protein conjugates also remained constant until 4 d of incubation in darkness. These results indicate that the ubiquitin-proteasome pathway remains functional until the late phases of senescence suggesting that it may participate in the regulatory aspects of the process rather than in the massive protein breakdown. Fil: Roberts, Irma. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales; Argentina Fil: Fernandez Murray, Jorge Pedro. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales; Argentina Fil: Passeron, Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales; Argentina Fil: Barneix, Atilio José. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales; Argentina |
description |
In the present paper, we studied the participation of the 20S proteasome, the proteolytic component of the ubiquitin-proteasome pathway, in the remobilization of bulk proteins in senescing wheat leaves. The detached leaves of 15-d-old plants were incubated in darkness for several days, and various proteolytic activities were analysed in soluble extracts prepared at 0, 48 and 96 h after detachment. The endoproteolytic activity, measured at pH 7.5 and 5.4, increased more than 10-fold and the total peptidasic activity increased up to 5-fold after 96 h of incubation in the dark, when expressed as specific activity. In the same period, the leaf-protein content decreased to less than 50% of that present at the initial time. The 20S proteasome chymotrypsin-like activity remained constant when it was expressed as activity per leaf fresh weight and resulted 2-fold higher in terms of specific activity. The western blot analysis showed that the amount of 20S proteasome protein and ubiquitin-protein conjugates also remained constant until 4 d of incubation in darkness. These results indicate that the ubiquitin-proteasome pathway remains functional until the late phases of senescence suggesting that it may participate in the regulatory aspects of the process rather than in the massive protein breakdown. |
publishDate |
2002 |
dc.date.none.fl_str_mv |
2002-02 |
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/11336/148958 Roberts, Irma; Fernandez Murray, Jorge Pedro; Passeron, Susana; Barneix, Atilio José; The activity of the 20S proteasome is maintained in detached wheat leaves during senescence in darkness; Elsevier France-Editions Scientifiques Medicales Elsevier; Plant Physiology and Biochemistry; 40; 2; 2-2002; 161-166 0981-9428 1873-2690 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/148958 |
identifier_str_mv |
Roberts, Irma; Fernandez Murray, Jorge Pedro; Passeron, Susana; Barneix, Atilio José; The activity of the 20S proteasome is maintained in detached wheat leaves during senescence in darkness; Elsevier France-Editions Scientifiques Medicales Elsevier; Plant Physiology and Biochemistry; 40; 2; 2-2002; 161-166 0981-9428 1873-2690 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.sciencedirect.com/science/article/pii/S0981942801013493 info:eu-repo/semantics/altIdentifier/doi/10.1016/s0981-9428(01)01349-3 |
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 |
Elsevier France-Editions Scientifiques Medicales Elsevier |
publisher.none.fl_str_mv |
Elsevier France-Editions Scientifiques Medicales Elsevier |
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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1844614322159878144 |
score |
13.070432 |