ArticlePlant physiology2003
Na+/H+ exchange activity in the plasma membrane of Arabidopsis.
Article in Plant physiology, 2003. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 65 papers.
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Who cites it
65 citing papers in PubMed, 193 citations in OpenAlex.
- Stigmasterol: An Enigmatic Plant Stress Sterol with Versatile Functions.International journal of molecular sciences · 2024Review
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- Types of Membrane Transporters and the Mechanisms of Interaction between Them and Reactive Oxygen Species in Plants.Antioxidants (Basel, Switzerland) · 2024Review
- Identification and expression analysis of calcium-dependent protein kinase family in oat (Frontiers in plant science · 2024Article
- Structural basis for the activity regulation of Salt Overly Sensitive 1 in Arabidopsis salt tolerance.Nature plants · 2023Article
- Structure-Guided Identification of Critical Residues in the Vacuolar Cation/Proton Antiporter NHX1 fromPlants (Basel, Switzerland) · 2023Article
- Architecture and autoinhibitory mechanism of the plasma membrane NaNature communications · 2023Article
- Involvement of the Membrane Nanodomain Protein,International journal of molecular sciences · 2023Article
- Genomic insights into genetic diploidization in the homosporous fern Adiantum nelumboides.Genome biology and evolution · 2022Article
- Morphological, physiological, biochemical, and transcriptome studies reveal the importance of transporters and stress signaling pathways during salinity stress in Prunus.Scientific reports · 2022Article
- Physiological Measurements and Transcriptome Survey Reveal How Semi-mangroveFrontiers in plant science · 2022Article
- Adaptative Mechanisms of HalophyticFrontiers in plant science · 2022Review
- Regulation of Cytosolic pH: The Contributions of Plant Plasma Membrane HInternational journal of molecular sciences · 2021Review
- Membrane Profiling by Free Flow Electrophoresis and SWATH-MS to Characterize Subcellular Compartment Proteomes inInternational journal of molecular sciences · 2021Article
- Maintenance of Cell Wall Integrity under High Salinity.International journal of molecular sciences · 2021Review
- Functional Characterization ofInternational journal of molecular sciences · 2021Article
- Silencing ofFrontiers in plant science · 2021Article
- Low Mannitol Concentrations inPlants (Basel, Switzerland) · 2020Article
- Genetic localization of the SPC gene controlling pod coiling direction in Medicago truncatula.Genes & genomics · 2020Article
- A Comprehensive Biophysical Model of Ion and Water Transport in Plant Roots. III. Quantifying the Energy Costs of Ion Transport in Salt-Stressed Roots ofFrontiers in plant science · 2020Article
5 more citing papers are in PubMed but not listed here.
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5 authors at 1 institution in 1 country.
Funding
Abstract
In plants, Na+/H+ exchangers in the plasma membrane are critical for growth in high levels of salt, removing toxic Na+ from the cytoplasm by transport out of the cell. The molecular identity of a plasma membrane Na+/H+ exchanger in Arabidopsis (SOS1) has recently been determined. In this study, immunological analysis provided evidence that SOS1 localizes to the plasma membrane of leaves and roots. To characterize the transport activity of this protein, purified plasma membrane vesicles were isolated from leaves of Arabidopsis. Na+/H+ exchange activity, monitored as the ability of Na to dissipate an established pH gradient, was absent in plants grown without salt. However, exchange activity was induced when plants were grown in 250 mm NaCl and increased with prolonged salt exposure up to 8 d. H+-coupled exchange was specific for Na, because chloride salts of other monovalent cations did not dissipate the pH gradient. Na+/H+ exchange activity was dependent on Na (substrate) concentration, and kinetic analysis indicated that the affinity (apparent Km) of the transporter for Na+ is 22.8 mm. Data from two experimental approaches supports electroneutral exchange (one Na+ exchanged for one proton): (a) no change in membrane potential was measured during the exchange reaction, and (b) Na+/H+ exchange was unaffected by the presence or absence of a membrane potential. Results from this research provide a framework for future studies into the regulation of the plant plasma membrane Na+/H+ exchanger and its relative contribution to the maintenance of cellular Na+ homeostasis during plant growth in salt.
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