Chloroplast-derived photo-oxidative stress causes changes in H<sub>2</sub>O<sub>2</sub> and <i>E</i><sub>GSH</sub> in other subcellular compartments

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dc.contributor.authorUgalde, Jose Manuel
dc.contributor.authorFuchs, Philippe
dc.contributor.authorNietzel, Thomas
dc.contributor.authorCutolo, Edoardo A.
dc.contributor.authorHomagk, Maria
dc.contributor.authorVothknecht, Ute C.
dc.contributor.authorHoluigue, Loreto
dc.contributor.authorSchwarzlaender, Markus
dc.contributor.authorMueller-Schuessele, Stefanie J.
dc.contributor.authorMeyer, Andreas J.
dc.date.accessioned2025-01-20T23:55:35Z
dc.date.available2025-01-20T23:55:35Z
dc.date.issued2021
dc.description.abstractMetabolic fluctuations in chloroplasts and mitochondria can trigger retrograde signals to modify nuclear gene expression. Mobile signals likely to be involved are reactive oxygen species (ROS), which can operate protein redox switches by oxidation of specific cysteine residues. Redox buffers, such as the highly reduced glutathione pool, serve as reservoirs of reducing power for several ROS-scavenging and ROS-induced damage repair pathways. Formation of glutathione disulfide and a shift of the glutathione redox potential (E-GSH) toward less negative values is considered as hallmark of several stress conditions. Here we used the herbicide methyl viologen (MV) to generate ROS locally in chloroplasts of intact Arabidopsis (Arabidopsis thaliana) seedlings and recorded dynamic changes in E-GSH and H2O2 levels with the genetically encoded biosensors Grx1-roGFP2 (for E-GSH) and roGFP2-Orp1 (for H2O2) targeted to chloroplasts, the cytosol, or mitochondria. Treatment of seedlings with MV caused rapid oxidation in chloroplasts and, subsequently, in the cytosol and mitochondria. MV-induced oxidation was significantly boosted by illumination with actinic light, and largely abolished by inhibitors of photosynthetic electron transport. MV also induced autonomous oxidation in the mitochondrial matrix in an electron transport chain activity-dependent manner that was milder than the oxidation triggered in chloroplasts by the combination of MV and light. In vivo redox biosensing resolves the spatiotemporal dynamics of compartmental responses to local ROS generation and provides a basis for understanding how compartment-specific redox dynamics might operate in retrograde signaling and stress acclimation in plants.
dc.fuente.origenWOS
dc.identifier.doi10.1093/plphys/kiaa095
dc.identifier.eissn1532-2548
dc.identifier.issn0032-0889
dc.identifier.urihttps://doi.org/10.1093/plphys/kiaa095
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/95098
dc.identifier.wosidWOS:000696366700011
dc.issue.numero1
dc.language.isoen
dc.pagina.final141
dc.pagina.inicio125
dc.revistaPlant physiology
dc.rightsacceso restringido
dc.subject.ods03 Good Health and Well-being
dc.subject.odspa03 Salud y bienestar
dc.titleChloroplast-derived photo-oxidative stress causes changes in H<sub>2</sub>O<sub>2</sub> and <i>E</i><sub>GSH</sub> in other subcellular compartments
dc.typeartículo
dc.volumen186
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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