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The K+ battery-regulating Arabidopsis K+ channel AKT2 is under the control of multiple post-translational steps
Citation
Sandmann, M and Sklodowski, K and Gajdanowicz, P and Michard, E and Rocha, M and Gomez-Porras, JL and Gonzalez, W and Correa, LGG and Ramirez-Aguilar, SJ and Cuin, TA and van Dongen, JT and Thibaud, J-B and Dreyer, I, The K+ battery-regulating Arabidopsis K+ channel AKT2 is under the control of multiple post-translational steps, Plant Signaling and Behavior, 6, (4) pp. 558-562. ISSN 1559-2316 (2011) [Refereed Article]
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DOI: doi:10.4161/psb.6.4.14908
Abstract
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.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | potassium, channel, potassium channel, AKT2, phloem (re)loading, post-translational modifications, potassium battery |
| Research Division: | Biological Sciences |
| Research Group: | Plant Biology |
| Research Field: | Plant Physiology |
| Objective Division: | Plant Production and Plant Primary Products |
| Objective Group: | Environmentally Sustainable Plant Production |
| Objective Field: | Management of Gaseous Waste from Plant Production (excl. Greenhouse Gases) |
| Author: | Cuin, TA (Dr Tracey Cuin) |
| ID Code: | 127012 |
| Year Published: | 2011 |
| Web of Science® Times Cited: | 69 |
| Deposited By: | Agriculture and Food Systems |
| Deposited On: | 2018-07-06 |
| Last Modified: | 2018-07-09 |
| Downloads: | 0 |
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