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Descripción
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| Potassium (K (+) ) is an important nutrient for plants. It serves as a cofactor of various enzymes and as the major inorganic solute maintaining plant cell turgor. In a recent study, an as yet unknown role of K (+) in plant homeostasis was shown. It was demonstrated that K (+) gradients in vascular tissues can serve as an energy source for phloem (re)loading processes and that the voltage-gated K (+) channels of the AKT2-type play a unique role in this process. The AKT2 channel can be converted by phosphorylation of specific serine residues (S210 and S329) into a non-rectifying channel that allows a rapid efflux of K (+) from the sieve element/companion cells (SE/CC) complex. The energy of this flux is used by other transporters for phloem (re)loading processes. Nonetheless, the results do indicate that post-translational modifications at S210 and S329 alone cannot explain AKT2 regulation. Here, we discuss the existence of multiple post-translational modification steps that work in concert to convert AKT2 from an inward-rectifying into a non-rectifying K (+) channel. | |
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Internacional
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Si |
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JCR del ISI
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No |
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Título de la revista
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Plant Signalling & Behavior |
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ISSN
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1559-2316 |
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Factor de impacto JCR
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Información de impacto
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times cited: 1 (05.12.2012) |
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Volumen
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6 |
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DOI
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Número de revista
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Desde la página
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558 |
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Hasta la página
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562 |
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Mes
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ABRIL |
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Ranking
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