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Registros recuperados: 14
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An iron-induced nitric oxide burst precedes ubiquitin-dependent protein degradation for Arabidopsis AtFer1 ferritin gene expression Inra
Arnaud, N .; Murgia, I.; Boucherez, J.; Briat, J.F.; Cellier, F.; Gaymard, F..
Ferritins play an essential role in iron homeostasis by sequestering iron in a bioavailable and non-toxic form. In plants, ferritin mRNAs are highly and quickly accumulated in response to iron overload. Such accumulation leads to a subsequent ferritin protein synthesis and iron storage, thus avoiding oxidative stress to take place. By combining pharmacological and imaging approaches in an Arabidopsis cell culture system, we have identified several elements in the signal transduction pathway leading to the increase of AtFer1 transcript level after iron treatment. Nitric oxide quickly accumulates in the plastids after iron treatment. This compound acts downstream of iron and upstream of a PP2A-type phosphatase to promote an increase of AtFer1 mRNA level. The...
Tipo: Journal Article Palavras-chave: FERRITINE; HOMEOSTASIE DU FER IRON STORAGE; SIGNAL TRANSDUCTION PATHWAY; IRON HOMEOSTASIS.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20071c1c786a&uri=/notices/prodinra1/2010/11/
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Essential transition metal homeostasis in plants Inra
Pilon, M.; Cohu, C.M.; Ravet, K.; Abdel-Ghany, S.E.; Gaymard, F..
The homeostasis of the essential transition metals copper, iron, manganese and zinc requires balanced activities of transporters that mediate import into the cell, distribution to organelles and export from the cell. Transcriptional control is important for the regulation of cellular homeostasis. In the case of Fe and Cu much progress has been made in uncovering the regulatory networks that mediate homeostasis, and key transcription factors have now been described. A master regulator of Cu homeostasis in Arabidopsis thaliana, AtSPL7, is related to the Chlamydomonas master regulator CCR1, suggesting that the key switch is conserved between the two systems even though different sets of targets are regulated in the two systems.
Tipo: Journal Article Palavras-chave: HOMEOSTASIE DU FER; PHYTOREMEDIATION; TRANSPORTEUR.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20106fc49dd8&uri=/notices/prodinra1/2010/12/
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Ferritins and iron storage in plants Inra
Briat, J.F.; Duc, C.; Ravet, K.; Gaymard, F..
Iron is essential for both plant productivity and nutritional quality. Improving plant iron content was attempted through genetic engineering of plants overexpressing ferritins. However, both the roles of these proteins in the plant physiology, and the mechanisms involved in the regulation of their expression are largely unknown. Although the structure of ferritins is highly conserved between plants and animals, their cellular localization differ. Furthermore, regulation of ferritin gene expression in response to iron excess occurs at the transcriptional level in plants, in contrast to animals which regulate ferritin expression at the translational level. In this review, our knowledge of the specific features of plant ferritins is presented, at the level...
Tipo: Journal Article Palavras-chave: IRON HOMEOSTASIS; OXIDATIVE STRESS; CHLOROPLAST; VACUOLE.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010daf77ff1&uri=/notices/prodinra1/2010/12/
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Ferritins control interaction between iron homeostasis and oxidative stress in Arabidopsis Inra
Ravet, K.; Touraine, B.; Boucherez, J.; Briat, J.F.; Gaymard, F.; Cellier, F..
Ferritin protein nanocages are the main iron store in mammals. They have been predicted to fulfil the same function in plants but direct evidence was lacking. To address this, a loss-of-function approach was developed in Arabidopsis. We present evidence that ferritins do not constitute the major iron pool either in seeds for seedling development or in leaves for proper functioning of the photosynthetic apparatus. Loss of ferritins in vegetative and reproductive organs resulted in sensitivity to excess iron, as shown by reduced growth and strong defects in flower development. Furthermore, the absence of ferritin led to a strong deregulation of expression of several metal transporters genes in the stalk, over-accumulation of iron in reproductive organs, and...
Tipo: Journal Article Palavras-chave: FERRITIN; IRON HOMEOSTASIS; OXIDATIVE STRESS; IRON STORAGE; IRON TRANSPORTER.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009dbcc10b7&uri=/notices/prodinra1/2010/12/
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Five-group distribution of the shaker-like K+ channel family in higher plants Inra
Pilot, G.; Pratelli, R.; Gaymard, F.; Meyer, Y.; Sentenac, H..
In higher plants, potassium channels of the Shaker family have been shown to play crucial roles in the uptake of K+ from the soil solution and subsequent transport of this ion at the cell, tissue, and organ levels. In the model plant Arabidopsis thaliana, this family is composed of nine members, which are the best characterized among plant channels at the protein, gene, and functional property levels. Plant Shaker channels share a common structure: a hydrophobic core composed of six transmembrane segments, a long cytoplasmic C-terminal region harboring a putative cyclic nucleotide binding domain, and a KHA domain. Many channels also contain an ankyrin domain between the putative cyclic nucleotide binding domain and the KHA domain. The analysis of 44 Shaker...
Tipo: Journal Article Palavras-chave: PLANTE; CANAL SHAKER; CANAL A POTASSIUM; FAMILLE MULTIGENE K+-SHAKER-LIKE POTASSIUM CHANNEL; PLANTS; ARABIDOPSIS; RICE INTRON; MULTIGENE FAMILY; GENOME K+.
Ano: 2003 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0500025203106960&uri=/notices/prodinra1/2010/12/
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Guard cell inward K+ channel activity in Arabidopsis involves expression of the twin channel subunits KAT1 and KAT2 Inra
Pilot, G.; Lacombe, B.; Gaymard, F.; Chérel, I.; Boucherez, J.; Thibaud, J.B.; Sentenac, H..
Stomatal opening, which controls gas exchanges between plants and the atmosphere, results from an increase in turgor of the two guard cells that surround the pore of the stoma. KAT1 was the only inward K+ channel shown to be expressed in Arabidopsis guard cells, where it was proposed to mediate a K+ influx that enables stomatal opening. We report that another Arabidopsis K+channel, KAT2, is expressed in guard cells. More than KAT1, KAT2 displays functional features resembling those of native inward K+ channels in guard cells. Coexpression inXenopus oocytes and two-hybrid experiments indicated that KAT1 and KAT2 can form heteromultimeric channels. The data indicate that KAT2 plays a crucial role in the stomatal opening machinery.
Tipo: Journal Article Palavras-chave: CATION; CANAL A POTASSIUM; EXPRESSION DES GENES; XENOPUS; STOMATE; REGULATION SOMATIQUE; CELLULE DE GARDE; TECHNIQUE ANALYTIQUE; SEQUENCE NUCLEOTIDIQUE; PH; ACIDIFICATION.
Ano: 2001 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0400023044101471&uri=/notices/prodinra1/2010/10/
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Iron uptake and storage in plants Inra
Briat, J.F.; Arnaud, N.; Cellier, F.; Curie, C.; Gaymard, F.; Ravet, K.; Seguela, M.; Vert, G..
Tipo: Journal Article Palavras-chave: FERRIC CHELATE; METAL TRANSPORT; IRON; ROOT; SACCHAROMYCES CEREVISIAE; FERRIN GENE EXPRESSION; IRT1.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20076a9b48c7&uri=/notices/prodinra1/2007/09/
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Iron utilization and metabolism in plants Inra
Briat, J.F.; Curie, C.; Gaymard, F..
The solubilization and long-distance allocation of iron between organs and tissues, as well as its subcellular compartmentalization and remobilization, involve various chelation and oxidation/reduction steps, transport activities and association with soluble proteins that store and buffer this metal. Maintaining iron homeostasis is an important determinant in building prosthetic groups such as heme and Fe-S clusters, and in assembling them into apoproteins, which are major components of plant metabolism. Such processes require complex protein machineries located in mitochondria and plastids. An essential role for iron metabolism and utilization in plant productivity is evidenced by the strong iron requirement for proper photosynthetic reactions.
Tipo: Journal Article Palavras-chave: IRON TRANSPORT; NICOTIANAMINE; YEAST MUTANT; FE-S.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200765e13c6b&uri=/notices/prodinra1/2007/09/
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Keeping nitrate in the roots: An unexpected requirement for cadmium tolerance in plants Inra
Gojon, A.; Gaymard, F..
Li et al. (2010) identified AtNRT1.8 as a membrane transporter involved in the control of long-distance transport of nitrate betweenroots and shoot. Both the regulation of AtNRT1.8 expression and the phenotype of an nrt1.8 mutant indicate that this transporterplays an important role in protecting the plant against cadmium toxicity, and possibly against a wide range of biotic and abioticstresses.
Tipo: Journal Article Palavras-chave:  .
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20106fa86112&uri=/notices/prodinra1/2010/12/
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New insights into ferritin synthesis and function highlight a link between iron homeostasis and oxidative stress in plants Inra
Briat, J.F.; Ravet, K.; Arnaud, N.; Duc, C.; Boucherez, J.; Touraine, B.; Cellier, F.; Gaymard, F..
Background: Iron is an essential element for both plant productivity and nutritional quality. Improving plant iron content was attempted through genetic engineering of plants overexpressing ferritins. However, both the roles of these proteins in plant physiology, and the mechanisms involved in the regulation of their expression are largely unknown. Although the structure of ferritins is highly conserved between plants and animals, their cellular localization differs. Furthermore, regulation of ferritin gene expression in response to iron excess occurs at the transcriptional level in plants, in contrast to animals which regulate ferritin expression at the translational level.Scope: In this review, an overview of our knowledge of bacterial and mammalian...
Tipo: Journal Article Palavras-chave: IRON; BACTERIOFERRITINS; FERRITINS; OXIDATIVE STRESS; IRON STORAGE; SEEDS; PATHOGENS; NUTRITION.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201022698fee&uri=/notices/prodinra1/2010/12/
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Post-translational regulation of AtFER2 ferritin in response to intracellular iron trafficking during fruit development in Arabidopsis Inra
Ravet, K.; Touraine, B.; Kim, S.A.; Cellier, F.; Thomine, S.; Guerinot, M.L.; Briat, J.F.; Gaymard, F..
Ferritins are major players in plant iron homeostasis. Surprisingly, their overexpression in transgenic plants led only to a moderate increase in seed iron content, suggesting the existence of control checkpoints for iron loading and storage in seeds. This work reports the identification of two of these checkpoints. First, measurement of seed metal content during fruit development in Arabidopsis thaliana reveals a similar dynamic of loading for Fe, Mn, Cu, and Zn. The step controlling metal loading into the seed occurs by the regulation of transport from the hull to the seed. Second, metal loading and ferritin abundance were monitored in different genetic backgrounds affected in vacuolar iron transport (AtVIT1, AtNRAMP3, AtNRAMP4) or plastid iron storage...
Tipo: Journal Article Palavras-chave: NUTRIENT AND METAL TRANSPORT; IRON TRANSPORT; FERRITIN; POST-TRANSCRIPTIONAL CONTROL; BIOFORTIFICATION.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20105ab38a2a&uri=/notices/prodinra1/2010/12/
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Regulation of iron homeostasis in Arabidopsis thaliana by the clock regulator time for coffee Inra
Duc, C.; Cellier, F.; Lobreaux, S.; Briat, J.F.; Gaymard, F..
In plants, iron homeostasis is tightly regulated to supply sufficient amounts of this metal for an optimal growth while preventing excess accumulation to avoid oxidative stress. To identify new regulators of iron homeostasis, a luciferase-based genetic screen using the Arabidopsis AtFer1 ferritin promoter as a target was developed. This screen identified TIME FOR COFFEE(TIC) as a regulator of AtFer1 gene expression. TIC was previously described as a nuclear regulator of the circadian clock. Mutants in the TIC gene exhibited a chlorotic phenotyperescued by exogenous iron addition and are hypersensitive to iron during the early stages of development. We showed that iron overload-responsive genes are regulated by TIC and by the central oscillator of the...
Tipo: Journal Article Palavras-chave:  .
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010a89a4096&uri=/notices/prodinra1/2010/12/
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The baculovirus/insect cell system as an alternative to Xenopus oocytes. First characterization of the AKT1 K+ channel from Arabidopsis thaliana Inra
Gaymard, F.; Cerutti, M.; Horeau, C.; Lemaillet, G.; Urbach, S.; Ravallec, M.; Devauchelle, G.; Sentenac, H.; Thibaud, J.B..
Tipo: Journal Article Palavras-chave: OOCYTE; XENOPUS; ELECTROPHYSIOLOGIE; PLANTE MODELE; ARABIDOPSIS THALIANA; EXPRESSION DES GENES; CONDUCTIVITE ELECTRIQUE.
Ano: 1996 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9900008549078397&uri=/notices/prodinra1/2010/09/
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The iron-responsive element (IRE)/iron-regulatory protein 1 (IRP1)-cytosolic aconitase iron-regulatory switch does not operate in plants. Inra
Arnaud, N.; Ravet, K.; Borlotti, A.; Touraine, B.; Boucherez, J.; Fizames, C.; Briat, J.F.; Cellier, F.; Gaymard, F..
Animal cytosolic ACO (aconitase) and bacteria ACO are able to switch to RNA-binding proteins [IRPs (iron-regulatory proteins)],thereby playing a key role in the regulation of iron homoeostasis. In the model plant Arabidopsis thaliana, we have identified three IRP1 homologues, named ACO1-3. To determine whether or not they may encode functional IRP proteins and regulate iron homoeostasis in plants, we have isolated loss-of-function mutants in the three genes. The aco1-1 and aco3-1 mutants show a clear decrease in cytosolic ACO activity. However, none of the mutants is affected in respect of the accumulation of the ferritin transcript or protein in response to iron excess. cis-acting elements potentially able to bind to the IRP have been searched for in...
Tipo: Journal Article Palavras-chave: IRT1; CYTOSOLIC ACONITASE; FERRITIN; IRON HOMEOSTASIS; IRON-REGULATORY PROTEIN 1; REACTIVE OXYGEN SPECIES; ROS.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007f7c8f204&uri=/notices/prodinra1/2007/09/
Registros recuperados: 14
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