Enables the transfer of a solute or solutes from one side of a membrane to the other according to the reaction: K+(in) + H+(out) = K+(out) + H+(in), where glutathione maintains the closed state.
high-affinity potassium ion transmembrane transporter activity
high-affinity secondary active nitrite transmembrane transporter activity +
light-driven active monoatomic ion transmembrane transporter activity
metal cation:monoatomic cation antiporter activity +
monoamine:proton antiporter activity
NADH dehydrogenase (ubiquinone) activity
neutral L-amino acid secondary active transmembrane transporter activity +
nitrite efflux transmembrane transporter activity
nucleoside transmembrane transporter activity, against a concentration gradient