Intracellular K+ sensing of SKOR, a Shaker-type K+ channel from Arabidopsis

The Plant Journal : for Cell and Molecular Biology
Kun LiuSheng Luan

Abstract

Most K+ channels in plants are structurally classified into the Shaker family named after the shaker K+ channel in Drosophila. Plant K+ channels function in many physiological processes including osmotic regulation and K+ nutrition. An outwardly rectifying K+ channel, SKOR, mediates the delivery of K+ from stelar cells to the xylem in the roots, a critical step in the long-distance distribution of K+ from roots to the upper parts of the plant. Here we report that SKOR channel activity is strictly dependent on intracellular K+ concentrations. Activation by K+ did not affect the kinetics of voltage dependence in SKOR, indicating that a voltage-independent gating mechanism underlies the K+ sensing process. Further analysis showed that the C-terminal non-transmembrane region of the SKOR protein was required for this sensing process. The intracellular K+ sensing mechanism couples SKOR activity to K+ nutrition status in the 'source cells', thereby establishing a supply-based unloading system for the regulation of K+ distribution.

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Citations

Feb 22, 2008·Proceedings of the National Academy of Sciences of the United States of America·Legong LiSheng Luan
Jul 26, 2008·Journal of Experimental Botany·Mark W SzczerbaHerbert J Kronzucker
Aug 10, 2006·Proceedings of the National Academy of Sciences of the United States of America·Legong LiSheng Luan
Oct 24, 2013·Journal of Experimental Botany·Frans J M Maathuis
Apr 10, 2007·FEBS Letters·Anne LebaudyHervé Sentenac
Apr 21, 2006·The Plant Journal : for Cell and Molecular Biology·Ingela JohanssonIngo Dreyer
Mar 4, 2008·Physiologia Plantarum·Dev T Britto, Herbert J Kronzucker
Jan 8, 2014·Journal of Integrative Plant Biology·Eri Adams, Ryoung Shin
Dec 23, 2016·The Plant Journal : for Cell and Molecular Biology·Qing MaSuo-Min Wang
Jan 30, 2018·Frontiers in Plant Science·Javier CanalesSebastian Brauchi
Jun 19, 2014·Molecules and Cells·Ryoung Shin
Mar 3, 2020·Frontiers in Plant Science·Shunya Saito, Nobuyuki Uozumi
Feb 12, 2021·Plant Science : an International Journal of Experimental Plant Biology·Xuesong WangYongguang Li

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