The K+ battery-regulating Arabidopsis K+ channel AKT2 is under the control of multiple post-translational steps
journal contribution
posted on 2023-05-19, 19:22authored bySandmann, 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.
History
Publication title
Plant Signaling and Behavior
Volume
6
Issue
4
Pagination
558-562
ISSN
1559-2316
Department/School
Tasmanian Institute of Agriculture (TIA)
Publisher
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)