7t4x
From Proteopedia
AKT1 K+ channel from A. thaliana in MSP2N2 lipid nanodisc
Structural highlights
FunctionAKT1_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] Publication Abstract from PubMedPlants obtain nutrients from the soil via transmembrane transporters and channels in their root hairs, from which ions radially transport in toward the xylem for distribution across the plant body. We determined structures of the hyperpolarization-activated channel AKT1 from Arabidopsis thaliana, which mediates K(+) uptake from the soil into plant roots. These structures of AtAKT1 embedded in lipid nanodiscs show that the channel undergoes a reduction of C4 to C2 symmetry, possibly to regulate its electrical activation. Symmetry Reduction in a Hyperpolarization-Activated Homotetrameric Ion Channel.,Dickinson MS, Pourmal S, Gupta M, Bi M, Stroud RM Biochemistry. 2021 Dec 29. doi: 10.1021/acs.biochem.1c00654. PMID:34964607[6] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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