zinc ion transmembrane transporter activity metal cation:proton antiporter activity zinc:proton antiporter activity https://github.com/geneontology/go-ontology/issues/23359 https://github.com/geneontology/go-ontology/issues/23874 2022-05-20T05:22:59Z molecular_function RHEA:72627 RHEA:28839 Enables the transfer of zinc from one side of a membrane to the other according to the reaction: H+(out) + Zn2+(in) = H+(in) + Zn2+(out). Some transporters exchange 1 H+ for a Zn2+ while others are electroneutral and exchange 2 H+. GO:0140826 pg