Inhibitors of photosystem II increase the expression of chloroplast diacylglycerol acyltransferase-3 and promote triacylglycerol accumulation in Chlamydomonas reinhardtii
- Autores
- Gonorazky, Ana Gabriela; Oresti, Gerardo Martin; Carro, María de las Mercedes; Beligni, María Verónica
- Año de publicación
- 2022
- Idioma
- inglés
- Tipo de recurso
- documento de conferencia
- Estado
- versión publicada
- Descripción
- Considerable progress has been made towards the understanding of triacylglycerol (TAG) accumulation in algae. A key aspect is finding conditions that trigger TAG production without reducing cell division. We identified a soluble diacylglycerol acyltransferase (DGAT), exclusive to the green lineage and moderately related to plant DGAT3, with heterologous DGAT activity. We demonstrated that DGAT3 localizes to the chloroplast in the model green alga Chlamydomonas reinhardtii and that its expression is induced by light in the presence of acetate, consistent with TAG accumulation. The light-dependent expression of DGAT3 and the presence of a 2Fe-2S iron-sulfur cluster-binding domain in its sequence indicates that this protein could accept electrons, directly or indirectly, from the photosynthetic machinery. The aim of this study was to investigate the relationship between DGAT3 expression and photosynthetic electron transport. With that purpose, we incubated C. reinhardtii wild type cc-125 cells with two photosystem II (PSII) inhibitors, 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) and 2,5-dibromo-6-isopropyl-3-methyl-1,4-benzoquinone (DBMIB), and one photosystem I (PSI) inhibitor, N,N′-dimethyl-4 4′-bipyridinium dichloride (paraquat). Both, Dgat3 mRNAs and TAGs increased in DCMU and DBMIB-treated cells as early as 15 minutes after initiating the experiment, whereas no significant variations were observed in paraquat-treated cells in the course of a 3 h incubation period. Our results suggest that DGAT3 expression and TAG biosynthesis increase when PSII is over-reduced in order to avoid photodamage. This occurs naturally in situations in which light absorption is higher than the rate of photosynthesis (e.g. during illumination at high light intensity) or artificially in chemically-altered PSII centers. Currently, this hypothesis is being evaluated in mutants that have deficiencies in the function of PSI, PSII or the cytb6f complex.
Fil: Gonorazky, Ana Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Biológicas. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Biológicas; Argentina
Fil: Oresti, Gerardo Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; Argentina
Fil: Carro, María de las Mercedes. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Biológicas. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Biológicas; Argentina
Fil: Beligni, María Verónica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Biológicas. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Biológicas; Argentina
LVIII Annual Meeting of the Argentine Society for Biochemistry and Molecular Biology Research
Mendoza
Argentina
Sociedad Argentina de Investigación en Bioquímica y Biología Molecular - Materia
-
DIACYLGLYCEROL ACYLTRANSFERASE
PHOTOPROTECTION
PHOTOSYNTHESIS
TRIACYLGLYCEROLS - 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:11336/236430
Ver los metadatos del registro completo
id |
CONICETDig_3533bf5b8b5a86c347f9d0e6dd1efdd6 |
---|---|
oai_identifier_str |
oai:ri.conicet.gov.ar:11336/236430 |
network_acronym_str |
CONICETDig |
repository_id_str |
3498 |
network_name_str |
CONICET Digital (CONICET) |
spelling |
Inhibitors of photosystem II increase the expression of chloroplast diacylglycerol acyltransferase-3 and promote triacylglycerol accumulation in Chlamydomonas reinhardtiiGonorazky, Ana GabrielaOresti, Gerardo MartinCarro, María de las MercedesBeligni, María VerónicaDIACYLGLYCEROL ACYLTRANSFERASEPHOTOPROTECTIONPHOTOSYNTHESISTRIACYLGLYCEROLShttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Considerable progress has been made towards the understanding of triacylglycerol (TAG) accumulation in algae. A key aspect is finding conditions that trigger TAG production without reducing cell division. We identified a soluble diacylglycerol acyltransferase (DGAT), exclusive to the green lineage and moderately related to plant DGAT3, with heterologous DGAT activity. We demonstrated that DGAT3 localizes to the chloroplast in the model green alga Chlamydomonas reinhardtii and that its expression is induced by light in the presence of acetate, consistent with TAG accumulation. The light-dependent expression of DGAT3 and the presence of a 2Fe-2S iron-sulfur cluster-binding domain in its sequence indicates that this protein could accept electrons, directly or indirectly, from the photosynthetic machinery. The aim of this study was to investigate the relationship between DGAT3 expression and photosynthetic electron transport. With that purpose, we incubated C. reinhardtii wild type cc-125 cells with two photosystem II (PSII) inhibitors, 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) and 2,5-dibromo-6-isopropyl-3-methyl-1,4-benzoquinone (DBMIB), and one photosystem I (PSI) inhibitor, N,N′-dimethyl-4 4′-bipyridinium dichloride (paraquat). Both, Dgat3 mRNAs and TAGs increased in DCMU and DBMIB-treated cells as early as 15 minutes after initiating the experiment, whereas no significant variations were observed in paraquat-treated cells in the course of a 3 h incubation period. Our results suggest that DGAT3 expression and TAG biosynthesis increase when PSII is over-reduced in order to avoid photodamage. This occurs naturally in situations in which light absorption is higher than the rate of photosynthesis (e.g. during illumination at high light intensity) or artificially in chemically-altered PSII centers. Currently, this hypothesis is being evaluated in mutants that have deficiencies in the function of PSI, PSII or the cytb6f complex.Fil: Gonorazky, Ana Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Biológicas. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Biológicas; ArgentinaFil: Oresti, Gerardo Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; ArgentinaFil: Carro, María de las Mercedes. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Biológicas. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Biológicas; ArgentinaFil: Beligni, María Verónica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Biológicas. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Biológicas; ArgentinaLVIII Annual Meeting of the Argentine Society for Biochemistry and Molecular Biology ResearchMendozaArgentinaSociedad Argentina de Investigación en Bioquímica y Biología MolecularTech Science Press2022info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectEncuentroJournalhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/236430Inhibitors of photosystem II increase the expression of chloroplast diacylglycerol acyltransferase-3 and promote triacylglycerol accumulation in Chlamydomonas reinhardtii; LVIII Annual Meeting of the Argentine Society for Biochemistry and Molecular Biology Research; Mendoza; Argentina; 2022; 176-1770327-95451667-5746CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://saib.org.ar/archivos/biocell-47.pdfNacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:31:52Zoai:ri.conicet.gov.ar:11336/236430instacron: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 10:31:53.044CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Inhibitors of photosystem II increase the expression of chloroplast diacylglycerol acyltransferase-3 and promote triacylglycerol accumulation in Chlamydomonas reinhardtii |
title |
Inhibitors of photosystem II increase the expression of chloroplast diacylglycerol acyltransferase-3 and promote triacylglycerol accumulation in Chlamydomonas reinhardtii |
spellingShingle |
Inhibitors of photosystem II increase the expression of chloroplast diacylglycerol acyltransferase-3 and promote triacylglycerol accumulation in Chlamydomonas reinhardtii Gonorazky, Ana Gabriela DIACYLGLYCEROL ACYLTRANSFERASE PHOTOPROTECTION PHOTOSYNTHESIS TRIACYLGLYCEROLS |
title_short |
Inhibitors of photosystem II increase the expression of chloroplast diacylglycerol acyltransferase-3 and promote triacylglycerol accumulation in Chlamydomonas reinhardtii |
title_full |
Inhibitors of photosystem II increase the expression of chloroplast diacylglycerol acyltransferase-3 and promote triacylglycerol accumulation in Chlamydomonas reinhardtii |
title_fullStr |
Inhibitors of photosystem II increase the expression of chloroplast diacylglycerol acyltransferase-3 and promote triacylglycerol accumulation in Chlamydomonas reinhardtii |
title_full_unstemmed |
Inhibitors of photosystem II increase the expression of chloroplast diacylglycerol acyltransferase-3 and promote triacylglycerol accumulation in Chlamydomonas reinhardtii |
title_sort |
Inhibitors of photosystem II increase the expression of chloroplast diacylglycerol acyltransferase-3 and promote triacylglycerol accumulation in Chlamydomonas reinhardtii |
dc.creator.none.fl_str_mv |
Gonorazky, Ana Gabriela Oresti, Gerardo Martin Carro, María de las Mercedes Beligni, María Verónica |
author |
Gonorazky, Ana Gabriela |
author_facet |
Gonorazky, Ana Gabriela Oresti, Gerardo Martin Carro, María de las Mercedes Beligni, María Verónica |
author_role |
author |
author2 |
Oresti, Gerardo Martin Carro, María de las Mercedes Beligni, María Verónica |
author2_role |
author author author |
dc.subject.none.fl_str_mv |
DIACYLGLYCEROL ACYLTRANSFERASE PHOTOPROTECTION PHOTOSYNTHESIS TRIACYLGLYCEROLS |
topic |
DIACYLGLYCEROL ACYLTRANSFERASE PHOTOPROTECTION PHOTOSYNTHESIS TRIACYLGLYCEROLS |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
Considerable progress has been made towards the understanding of triacylglycerol (TAG) accumulation in algae. A key aspect is finding conditions that trigger TAG production without reducing cell division. We identified a soluble diacylglycerol acyltransferase (DGAT), exclusive to the green lineage and moderately related to plant DGAT3, with heterologous DGAT activity. We demonstrated that DGAT3 localizes to the chloroplast in the model green alga Chlamydomonas reinhardtii and that its expression is induced by light in the presence of acetate, consistent with TAG accumulation. The light-dependent expression of DGAT3 and the presence of a 2Fe-2S iron-sulfur cluster-binding domain in its sequence indicates that this protein could accept electrons, directly or indirectly, from the photosynthetic machinery. The aim of this study was to investigate the relationship between DGAT3 expression and photosynthetic electron transport. With that purpose, we incubated C. reinhardtii wild type cc-125 cells with two photosystem II (PSII) inhibitors, 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) and 2,5-dibromo-6-isopropyl-3-methyl-1,4-benzoquinone (DBMIB), and one photosystem I (PSI) inhibitor, N,N′-dimethyl-4 4′-bipyridinium dichloride (paraquat). Both, Dgat3 mRNAs and TAGs increased in DCMU and DBMIB-treated cells as early as 15 minutes after initiating the experiment, whereas no significant variations were observed in paraquat-treated cells in the course of a 3 h incubation period. Our results suggest that DGAT3 expression and TAG biosynthesis increase when PSII is over-reduced in order to avoid photodamage. This occurs naturally in situations in which light absorption is higher than the rate of photosynthesis (e.g. during illumination at high light intensity) or artificially in chemically-altered PSII centers. Currently, this hypothesis is being evaluated in mutants that have deficiencies in the function of PSI, PSII or the cytb6f complex. Fil: Gonorazky, Ana Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Biológicas. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Biológicas; Argentina Fil: Oresti, Gerardo Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; Argentina Fil: Carro, María de las Mercedes. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Biológicas. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Biológicas; Argentina Fil: Beligni, María Verónica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Biológicas. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Biológicas; Argentina LVIII Annual Meeting of the Argentine Society for Biochemistry and Molecular Biology Research Mendoza Argentina Sociedad Argentina de Investigación en Bioquímica y Biología Molecular |
description |
Considerable progress has been made towards the understanding of triacylglycerol (TAG) accumulation in algae. A key aspect is finding conditions that trigger TAG production without reducing cell division. We identified a soluble diacylglycerol acyltransferase (DGAT), exclusive to the green lineage and moderately related to plant DGAT3, with heterologous DGAT activity. We demonstrated that DGAT3 localizes to the chloroplast in the model green alga Chlamydomonas reinhardtii and that its expression is induced by light in the presence of acetate, consistent with TAG accumulation. The light-dependent expression of DGAT3 and the presence of a 2Fe-2S iron-sulfur cluster-binding domain in its sequence indicates that this protein could accept electrons, directly or indirectly, from the photosynthetic machinery. The aim of this study was to investigate the relationship between DGAT3 expression and photosynthetic electron transport. With that purpose, we incubated C. reinhardtii wild type cc-125 cells with two photosystem II (PSII) inhibitors, 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) and 2,5-dibromo-6-isopropyl-3-methyl-1,4-benzoquinone (DBMIB), and one photosystem I (PSI) inhibitor, N,N′-dimethyl-4 4′-bipyridinium dichloride (paraquat). Both, Dgat3 mRNAs and TAGs increased in DCMU and DBMIB-treated cells as early as 15 minutes after initiating the experiment, whereas no significant variations were observed in paraquat-treated cells in the course of a 3 h incubation period. Our results suggest that DGAT3 expression and TAG biosynthesis increase when PSII is over-reduced in order to avoid photodamage. This occurs naturally in situations in which light absorption is higher than the rate of photosynthesis (e.g. during illumination at high light intensity) or artificially in chemically-altered PSII centers. Currently, this hypothesis is being evaluated in mutants that have deficiencies in the function of PSI, PSII or the cytb6f complex. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/conferenceObject Encuentro Journal http://purl.org/coar/resource_type/c_5794 info:ar-repo/semantics/documentoDeConferencia |
status_str |
publishedVersion |
format |
conferenceObject |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/236430 Inhibitors of photosystem II increase the expression of chloroplast diacylglycerol acyltransferase-3 and promote triacylglycerol accumulation in Chlamydomonas reinhardtii; LVIII Annual Meeting of the Argentine Society for Biochemistry and Molecular Biology Research; Mendoza; Argentina; 2022; 176-177 0327-9545 1667-5746 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/236430 |
identifier_str_mv |
Inhibitors of photosystem II increase the expression of chloroplast diacylglycerol acyltransferase-3 and promote triacylglycerol accumulation in Chlamydomonas reinhardtii; LVIII Annual Meeting of the Argentine Society for Biochemistry and Molecular Biology Research; Mendoza; Argentina; 2022; 176-177 0327-9545 1667-5746 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://saib.org.ar/archivos/biocell-47.pdf |
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 application/pdf application/pdf application/pdf application/pdf |
dc.coverage.none.fl_str_mv |
Nacional |
dc.publisher.none.fl_str_mv |
Tech Science Press |
publisher.none.fl_str_mv |
Tech Science Press |
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 |
_version_ |
1844614331241594880 |
score |
13.070432 |