5aar

Structural highlights

Function

[AKT1_ARATH] Highly selective inward-rectifying potassium channel that mediate potassium uptake by plant roots in response to low K(+) conditions, by a calcium-, CBL-, and CIPK-dependent pathway. Positively regulated by phosphorylation by CIPK23. Negatively regulated by a kinase-independent regulatory mechanism involving a competing direct binding of CBL10. Involved in the stomatal regulation by monitoring the turgor pressure in guard cells. Assuming opened or closed conformations in response to the voltage difference across the membrane, the channel is activated by hyperpolarization. May interact with the cytoskeleton or with regulatory proteins.^{[1] [2] [3] [4] [5]}

References

1. ↑ Pilot G, Gaymard F, Mouline K, Cherel I, Sentenac H. Regulated expression of Arabidopsis shaker K+ channel genes involved in K+ uptake and distribution in the plant. Plant Mol Biol. 2003 Mar;51(5):773-87. PMID:12678562
2. ↑ Xu J, Li HD, Chen LQ, Wang Y, Liu LL, He L, Wu WH. A protein kinase, interacting with two calcineurin B-like proteins, regulates K+ transporter AKT1 in Arabidopsis. Cell. 2006 Jun 30;125(7):1347-60. PMID:16814720 doi:http://dx.doi.org/S0092-8674(06)00769-0
3. ↑ Li L, Kim BG, Cheong YH, Pandey GK, Luan S. A Ca(2)+ signaling pathway regulates a K(+) channel for low-K response in Arabidopsis. Proc Natl Acad Sci U S A. 2006 Aug 15;103(33):12625-30. Epub 2006 Aug 8. PMID:16895985 doi:http://dx.doi.org/0605129103
4. ↑ Lee SC, Lan WZ, Kim BG, Li L, Cheong YH, Pandey GK, Lu G, Buchanan BB, Luan S. A protein phosphorylation/dephosphorylation network regulates a plant potassium channel. Proc Natl Acad Sci U S A. 2007 Oct 2;104(40):15959-64. Epub 2007 Sep 26. PMID:17898163 doi:http://dx.doi.org/0707912104
5. ↑ Hirsch RE, Lewis BD, Spalding EP, Sussman MR. A role for the AKT1 potassium channel in plant nutrition. Science. 1998 May 8;280(5365):918-21. PMID:9572739