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Voltage-independent, large conductance and potassium- selective tonoplast ion channel.
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ATKCO1 can form functional potassium transport systems in E. coli
an essential role of the vacuolar potassium channel TPK1 in salt-stress adaptation
TPK1 must assemble correctly to pass endoplasmic reticulum quality control.
data clearly demonstrate that TPK1 (KCO1) is a voltage-independent, Ca(2+)-activated, K(+)-selective ion channel in the vacuolar membrane that does not mediate SV-type ionic currents [TPK1]
The two-pore channel TPK1 gene encodes the vacuolar K+ conductance and plays a role in K+ homeostasis.
findings show that AtTPK1 (KCO1), interacts with 14-3-3 proteins (general regulating factors, GRFs; TPK1 seems to provide for a Ca(2+)- and 14-3-3-sensitive mechanism capable of controlling cytoplasmic potassium homeostasis in plants
Voltage-independent, large conductance and potassium- selective tonoplast ion channel. Regulated by cytoplasmic calcium and pH. Does not mediate slow-vacuolar (SV) ionic currents, but essential to establish VK currents. Has some permeability for Rb(+) and NH(4)(+), but none for Na(+), Cs(+) or Li(+). Involved in intracellular K(+) redistribution and/or K(+) retranslocation between different tissues.