ArticleBiophysical journal2003
Regulation of the fast vacuolar channel by cytosolic and vacuolar potassium.
Article in Biophysical journal, 2003. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers.
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Who cites it
13 citing papers in PubMed, 33 citations in OpenAlex.
- Potassium homeostasis and signalling: from the whole plant to the subcellular level.Quantitative plant biology · 2025Review
- Current Methods to Unravel the Functional Properties of Lysosomal Ion Channels and Transporters.Cells · 2022Review
- Effect of Auxin (IAA) on the Fast Vacuolar (FV) Channels in Red Beet (International journal of molecular sciences · 2020Article
- Modulation of Ion Transport Across Plant Membranes by Polyamines: Understanding Specific Modes of Action Under Stress.Frontiers in plant science · 2020Article
- Reduced tonoplast fast-activating and slow-activating channel activity is essential for conferring salinity tolerance in a facultative halophyte, quinoa.Plant physiology · 2013Article
- Differential activity of plasma and vacuolar membrane transporters contributes to genotypic differences in salinity tolerance in a Halophyte Species, Chenopodium quinoa.International journal of molecular sciences · 2013Article
- The Arabidopsis central vacuole as an expression system for intracellular transporters: functional characterization of the Cl-/H+ exchanger CLC-7.The Journal of physiology · 2012Article
- Biological physics in México: Review and new challenges.Journal of biological physics · 2011Article
- The surface charge density of plant cell membranes (sigma): an attempt to resolve conflicting values for intrinsic sigma.Journal of experimental botany · 2010Article
- Plant ion channels: gene families, physiology, and functional genomics analyses.Annual review of physiology · 2009Review
- Regulation of the slow vacuolar channel by luminal potassium: role of surface charge.The Journal of membrane biology · 2005Article
- Fast-activating channel controls cation fluxes across the native chloroplast envelope.The Journal of membrane biology · 2005Article
- Osmotic effects on the electrical properties of Arabidopsis root hair vacuoles in situ.Plant physiology · 2004Article
Corrections and comments
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Authors and funding
2 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
At resting cytosolic Ca(2)(+), passive K(+) conductance of a higher plant tonoplast is likely dominated by fast vacuolar (FV) channels. This patch-clamp study describes K(+)-sensing behavior of FV channels in Beta vulgaris taproot vacuoles. Variation of K(+) between 10 and 400 mM had little effect on the FV channel conductance, but a pronounced one on the open probability. Shift of the voltage dependence by cytosolic K(+) could be explained by screening of the negative surface charge with a density sigma = 0.25 e(-)/nm(2). Vacuolar K(+) had a specific effect on the FV channel gating at negative potentials without significant effect on closed-open transitions at positive ones. Due to K(+) effects at either membrane side, the potential at which the FV channel has minimal activity was always situated at approximately 50 mV below the potassium equilibrium potential, E(K(+)). At tonoplast potentials below or equal to E(K(+)), the FV channel open probability was almost independent on the cytosolic K(+) but varied in a proportion to the vacuolar K(+). Therefore, the release of K(+) from the vacuole via FV channels could be controlled by the vacuolar K(+) in a feedback manner; the more K(+) is lost the lower will be the transport rate.
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