label: gamma-aminobutyric acid:proton antiporter activity
label_lc: gamma-aminobutyric acid:proton antiporter activity
description: "Enables the transfer of a solute or solutes from one side of a membrane to the other according to the reaction: 4-aminobutanoate(out) + H+(in) = 4-aminobutanoate(in) + H+(out)."