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The K+ battery-regulating Arabidopsis K+ channel AKT2 is under the control of multiple post-translational steps


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]

Copyright Statement

Copyright 2011 Landes Bioscience

DOI: doi:10.4161/psb.6.4.14908


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)
UTAS Author:Cuin, TA (Dr Tracey Cuin)
ID Code:127012
Year Published:2011
Web of Science® Times Cited:157
Deposited By:Agriculture and Food Systems
Deposited On:2018-07-06
Last Modified:2018-08-13

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