University Of Tasmania

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

journal contribution
posted on 2023-05-19, 19:22 authored by Sandmann, M, Sklodowski, K, Gajdanowicz, P, Michard, E, Rocha, M, Gomez-Porras, JL, Gonzalez, W, Correa, LGG, Ramirez-Aguilar, SJ, Tracey Cuin, van Dongen, JT, Thibaud, J-B, Dreyer, I
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.


Publication title

Plant Signaling and Behavior










Tasmanian Institute of Agriculture (TIA)


Taylor & Francis Inc

Place of publication

United Kingdom

Rights statement

Copyright 2011 Landes Bioscience

Repository Status

  • Restricted

Socio-economic Objectives

Management of gaseous waste from plant production (excl. greenhouse gases)