Search results for "Signal Transduction"

showing 10 items of 2020 documents

The Ectocarpus genome and the independent evolution of multicellularity in brown algae

2010

Brown algae (Phaeophyceae) are complex photosynthetic organisms with a very different evolutionary history to green plants, to which they are only distantly related. These seaweeds are the dominant species in rocky coastal ecosystems and they exhibit many interesting adaptations to these, often harsh, environments. Brown algae are also one of only a small number of eukaryotic lineages that have evolved complex multicellularity (Fig. 1). We report the 214 million base pair (Mbp) genome sequence of the filamentous seaweed Ectocarpus siliculosus (Dillwyn) Lyngbye, a model organism for brown algae, closely related to the kelps (Fig. 1). Genome features such as the presence of an extended set of…

0106 biological sciencesLineage (evolution)Molecular Sequence DataPhaeophyta01 natural sciencesGenomeEvolution Molecular03 medical and health sciencesAlgae[SDV.BDD] Life Sciences [q-bio]/Development BiologyBotanyBIOLOGIE CELLULAIREAnimals14. Life underwater[SDV.BDD]Life Sciences [q-bio]/Development Biologyflore marinePhylogenyOrganismComputingMilieux_MISCELLANEOUSphéophycées030304 developmental biology0303 health sciencesGenomeMultidisciplinarybiologyEctocarpus siliculosusAlgal ProteinsEukaryotaPigments BiologicalEctocarpus15. Life on landbiology.organism_classificationBiological EvolutionBrown algaeMulticellular organismEvolutionary biologyalgues brunesBiologieSignal Transduction010606 plant biology & botany
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Nitric Oxide in Plants: Production and Cross-talk with Ca2+ Signaling

2008

International audience; Nitric oxide (NO) is a diatomic gas that performs crucial functions in a wide array of physiological processes in animals. The past several years have revealed much about its roles in plants. It is well established that NO is synthesized from nitrite by nitrate reductase (NR) and via chemical pathways. There is increasing evidence for the occurrence of an alternative pathway in which NO production is catalysed from L-arginine by a so far non-identified enzyme. Contradictory results have been reported regarding the respective involvement of these enzymes in specific physiological conditions. Although much remains to be proved, we assume that these inconsistencies can …

0106 biological sciencesMAPK/ERK pathwayArabidopsisPlant ScienceCalcium-Transporting ATPasesBiologyNitrate reductaseArginine01 natural sciencesPlant Physiological PhenomenaNitrate ReductaseNitric oxide03 medical and health scienceschemistry.chemical_compoundNitrateProtein kinasesNitrilesAnimals[SDV.BV]Life Sciences [q-bio]/Vegetal BiologyNitriteMolecular BiologyNitritesPlant Physiological Phenomena030304 developmental biologyMammals0303 health sciencesKinasefungiNitric oxidechemistryBiochemistrySecond messenger systemCitrullineCalciumCryptogeinNitric Oxide SynthaseGenome Plant010606 plant biology & botanySignal Transduction
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Activation of a nuclear-localized SIPK in tobacco cells challenged by cryptogein, an elicitor of plant defence reactions.

2009

When a plant cell is challenged by a well-defined stimulus, complex signal transduction pathways are activated to promote the modulation of specific sets of genes and eventually to develop adaptive responses. In this context, protein phosphorylation plays a fundamental role through the activation of multiple protein kinase families. Although the involvement of protein kinases at the plasma membrane and cytosolic levels are now well-documented, their nuclear counterparts are still poorly investigated. In the field of plant defence reactions, no known study has yet reported the activation of a nuclear protein kinase and/or its nuclear activity in plant cells, although some protein kinases, e.…

0106 biological sciencesMAPK/ERK pathwayMolecular Sequence DataActive Transport Cell NucleusBiology01 natural sciencesBiochemistryMAP2K703 medical and health sciencesCytosolTobaccoASK1Protein phosphorylation[SDV.BBM]Life Sciences [q-bio]/Biochemistry Molecular BiologyAmino Acid SequenceNuclear proteinProtein kinase AMolecular BiologyConserved Sequence030304 developmental biologyPlant ProteinsCell Nucleus0303 health sciencesKinasePlant ExtractsAlgal ProteinsLife SciencesCell BiologyCell biologyEnzyme ActivationBiochemistrySignal transductionMitogen-Activated Protein KinasesSequence Alignment010606 plant biology & botanySignal TransductionThe Biochemical journal
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Integrated signaling network involving calcium, nitric oxide, active oxygen species but not mitogen-activated protein kinases in BcPG1-elicited grape…

2006

We have already reported the identification of the endopolygalacturonase 1 (BcPG1) from Botrytis cinerea as a potent elicitor of defense responses in grapevine, independently of its enzymatic activity. The aim of the present study is the analysis of the signaling pathways triggered by BcPG1 in grapevine cells. Our data indicate that BcPG1 induces a Ca2+ entry from the apoplasm, which triggers a phosphorylation-dependent nitric oxide (NO) production via an enzyme probably related to a NO synthase. Then NO is involved in i) cytosolic calcium homeostasis, by activating Ca2+ release from internal stores and regulating Ca2+ fluxes across the plasma membrane, ii) plasma membrane potential variat…

0106 biological sciencesMAPK/ERK pathwayTime FactorsPhysiology[SDV]Life Sciences [q-bio]Phenylalanine ammonia-lyase01 natural sciencesNitric oxideFungal Proteins03 medical and health scienceschemistry.chemical_compounddepolarizationGene Expression Regulation Plantplant defensenitric oxideVitisdépolarisationProtein kinase ACells Cultured030304 developmental biology0303 health scienceselicitorbiologyelicitor; grapevine; plant defense; nitric oxideKinaseGeneral MedicinePlants Genetically ModifiedElicitorgrapevinechemistryBiochemistryMitogen-activated protein kinasebiology.proteinCalciumBotrytisMitogen-Activated Protein KinasesSignal transductionbotrytis cinereavigneReactive Oxygen SpeciesAgronomy and Crop ScienceSignal Transduction010606 plant biology & botany
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Plasma membrane sterol complexation, generated by filipin, triggers signaling responses in tobacco cells

2010

International audience; The effects of changes in plasma membrane (PM) sterol lateral organization and availability on the control of signaling pathways have been reported in various animal systems, but rarely assessed in plant cells. In the present study, the pentaene macrolide antibiotic filipin III, commonly used in animal systems as a sterol sequestrating agent, was applied to tobacco cells. We show that filipin can be used at a non-lethal concentration that still allows an homogeneous labeling of the plasma membrane and the formation of filipin-sterol complexes at the ultrastructural level. This filipin concentration triggers a rapid and transient NADPH oxidase-dependent production of …

0106 biological sciencesMembrane Fluidity[SDV]Life Sciences [q-bio]CellBiophysicsPLANTEBiology01 natural sciencesFilipinBiochemistry03 medical and health scienceschemistry.chemical_compoundTobaccomedicinepolycyclic compoundsMEMBRANE PLASMIQUEFilipinPhosphorylation030304 developmental biologySterolchemistry.chemical_classification0303 health sciencesReactive oxygen speciesCell DeathCell MembranePhytosterolsPlantCell BiologyPlant cellSterolCell biologymedicine.anatomical_structurechemistrySignalizationPotassiumSIGNALISATIONPhosphorylationlipids (amino acids peptides and proteins)sense organsSignal transductionReactive Oxygen SpeciesLaurdanSignal Transduction010606 plant biology & botanyPlasma membraneBiochimica et Biophysica Acta (BBA) - Biomembranes
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Regulation of plant NADPH oxidase.

2007

Addendum to: Regulation of Reactive Oxygen Species Production by a 14-3-3 Protein in Elicited Tobacco Cells. T. Elmayan, J. Fromentin, C. Riondet, G. Alcaraz, J. Blein and F. Simon-Plas. Plant Cell Environ 2007; 30:722–32; International audience; The production of Reactive Oxygen Species (ROS) is one of the key events occurring during the response of plants to environmental changes, and contributing to establish adaptive signaling pathways. A plasma membrane bound NADPH oxidase enzyme has been evidenced as the ROS producing system in various plant‑microorganisms interactions. We very recently reported, that a protein of the 14‑3‑3 family was able to interact directly with the C‑terminus par…

0106 biological sciencesMembrane boundContext (language use)Plant Science01 natural sciences[SDV.GEN.GPL]Life Sciences [q-bio]/Genetics/Plants genetics03 medical and health sciences[SDV.GEN.GPL] Life Sciences [q-bio]/Genetics/Plants geneticsNADPH OXIDASEPlant defense against herbivoryREACTIVE OXYGEN SPECIES14-3-3030304 developmental biologyPROTEINE PHOSPHATASE TYPE 2Cchemistry.chemical_classification0303 health sciencesReactive oxygen speciesOxidase testNADPH oxidasebiologyTWO-HYBRIDArticle AddendumEnzymeBiochemistrychemistryREGULATIONbiology.proteinSignal transduction010606 plant biology & botanyPlant signalingbehavior
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Comparison of the effects of cryptogein and oligogalacturonides on tabacco cells and evidence of different forms of desensitization induced by these …

1998

Abstract The effects of cryptogein and oligogalacturonides (OGs) were compared on tobacco cells by measuring calcium influx and calcium-dependent responses including extracellular alkalinization and H 2 O 2 production. The main difference is the higher calcium influx and the sustained H 2 O 2 production induced by cryptogein compared to OGs. Amplitude and duration of calcium signalling triggered by cryptogein or OGs may explain the necrotic effect of cryptogein, and the absence of necrosis in tobacco plants treated with OGs. We used induction of alkalinization and H 2 O 2 production to investigate cryptogein effects after a first treatment with cryptogein or OGs, and reciprocally. Results s…

0106 biological sciencesNicotiana tabacumchemistry.chemical_elementStimulationPlant ScienceCalciumBiology01 natural sciences[SDV.GEN.GPL]Life Sciences [q-bio]/Genetics/Plants genetics03 medical and health sciences[SDV.GEN.GPL] Life Sciences [q-bio]/Genetics/Plants geneticsBotanyGeneticsExtracellularComputingMilieux_MISCELLANEOUS030304 developmental biologyCalcium signaling0303 health sciencesGeneral Medicinebiology.organism_classificationElicitorCell biologyRespiratory burstchemistrySignal transductionAgronomy and Crop Science010606 plant biology & botany
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Arabidopsis plants deficient in plastidial glyceraldehyde-3-phosphate dehydrogenase show alterations in abscisic acid (ABA) signal transduction: inte…

2010

Abscisic acid (ABA) controls plant development and regulates plant responses to environmental stresses. A role for ABA in sugar regulation of plant development has also been well documented although the molecular mechanisms connecting the hormone with sugar signal transduction pathways are not well understood. In this work it is shown that Arabidopsis thaliana mutants deficient in plastidial glycolytic glyceraldehyde-3-phosphate dehydrogenase (gapcp1gapcp2) are ABA insensitive in growth, stomatal closure, and germination assays. The ABA levels of gapcp1gapcp2 were normal, suggesting that the ABA signal transduction pathway is impaired in the mutants. ABA modified gapcp1gapcp2 gene expressio…

0106 biological sciencesPhysiologyArabidopsisPlant Science01 natural sciencesSerine03 medical and health scienceschemistry.chemical_compoundAmino acid homeostasisPlant Growth RegulatorsGene Expression Regulation PlantArabidopsisArabidopsis thalianaPlastidsAbscisic acidGlyceraldehyde 3-phosphate dehydrogenase030304 developmental biologyglyceraldehyde-3-phosphate dehydrogenase0303 health sciencesbiologyArabidopsis Proteinsorganic chemicalsfungiGlyceraldehyde-3-Phosphate Dehydrogenasesfood and beveragessugar signallingglycolysisbiology.organism_classificationResearch Papers3. Good healthGAPCpchemistryBiochemistryABAABA signal transductionbiology.proteinCarbohydrate MetabolismSignal transductionSugar signal transduction010606 plant biology & botanyAbscisic AcidSignal Transduction
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Glutathione deficiency of the Arabidopsis mutant pad2-1 affects oxidative stress-related events, defense gene expression and hypersensitive response

2011

L'article original est publié par The American Society of Plant Biologists; International audience; The Arabidopsis (Arabidopsis thaliana) phytoalexin-deficient mutant pad2-1 displays enhanced susceptibility to a broad range of pathogens and herbivorous insects that correlates with deficiencies in the production of camalexin, indole glucosinolates, and salicylic acid (SA). The pad2-1 mutation is localized in the GLUTAMATE-CYSTEINE LIGASE (GCL) gene encoding the first enzyme of glutathione biosynthesis. While pad2-1 glutathione deficiency is not caused by a decrease in GCL transcripts, analysis of GCL protein level revealed that pad2-1 plants contained only 48% of the wild-type protein amoun…

0106 biological sciencesPhysiologyMutantGlutathione reductaseArabidopsisOligosaccharidesPlant Science01 natural scienceschemistry.chemical_compoundAnti-Infective AgentsGene Expression Regulation PlantCamalexinArabidopsis thaliana0303 health sciencesGlutathioneBiochemistryHost-Pathogen InteractionsDisease SusceptibilitySalicylic AcidOxidation-ReductionSignal TransductionHypersensitive responsePhytophthoradisease resistanceBiologyNitric Oxiderespiratory burst oxidase homolog d[SDV.GEN.GPL]Life Sciences [q-bio]/Genetics/Plants genetics03 medical and health sciencesStress PhysiologicalGeneticsPlants Interacting with Other Organismsglutathione reductase030304 developmental biologyPlant DiseasesArabidopsis ProteinsCell MembraneWild typeGlutathioneHydrogen Peroxidebiology.organism_classificationMolecular biologyPlant LeavesOxidative StresschemistryMutationglutathione-s-transferaseIsochorismate synthasebiology.proteinglutamate-cysteine ligaseReactive Oxygen Species010606 plant biology & botany
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Comparison of binding properties and early biological effects of elicitins in tobacco cells

1998

Abstract Elicitins are a family of small proteins secreted by Phytophthora species that have a high degree of homology and elicit defense reactions in tobacco (Nicotiana tabacum). They display acidic or basic characteristics, the acidic elicitins being less efficient in inducing plant necrosis. In this study we compared the binding properties of four elicitins (two basic and two acidic) and early-induced signal transduction events (Ca2+ influx, extracellular medium alkalinization, and active oxygen species production). The affinity for tobacco plasma membrane-binding sites and the number of binding sites were similar for all four elicitins. Furthermore, elicitins compete with one another fo…

0106 biological sciencesPhysiologyNicotiana tabacumPlant Science01 natural sciences[SDV.GEN.GPL]Life Sciences [q-bio]/Genetics/Plants genetics03 medical and health sciencesCell surface receptor[SDV.GEN.GPL] Life Sciences [q-bio]/Genetics/Plants geneticsGeneticsExtracellularBinding siteComputingMilieux_MISCELLANEOUS030304 developmental biology0303 health sciencesbiologyBinding proteinElicitinTECHNIQUE DES TRACEURSbiology.organism_classificationElicitorBiochemistryCULTURE DE CELLULESignal transduction010606 plant biology & botanyResearch Article
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