A new brain mitochondrial sodium-sensitive potassium channel: effect of sodium ions on respiratory chain activity.

We have determined the electropharmacological properties of a new potassium channel from brain mitochondrial membrane using a planar lipid bilayer method. Our results show the presence of a channel with a conductance of 150 pS at potentials between 0 and -60 mV in 200 mM /50 mM KCl solutions. The channel was voltage independent, with an open probability value of approximately 0.