. "Catalysis of the transfer of a solute or solutes from one side of a membrane to the other according to the reaction: solute(out) + H+(out) = solute(in) + H+(in)." . . "L-idonate/D-gluconate:hydrogen symporter activity" . "proline/glycine/betaine:hydrogen/sodium symporter activity" . "solute:hydrogen symporter activity" . "heavy metal ion:hydrogen symporter activity" . "high affinity metal ion uptake transporter activity" . "low affinity metal ion uptake transporter activity" . "solute:proton symporter activity" . . . . . . . . . . . . . . . . . . . . . . . .