results in transport across has primary input protein transmembrane transporter activity proton motive force dependent protein transmembrane transporter activity Catalysis of the transfer of proteins from one side of a membrane to the other. Transportation is dependent on pH gradient across the membrane. arginine targeting transmembrane transporter activity twin-arginine targeting transmembrane transporter activity pH-dependent protein transporter activity delta-pH-dependent protein transporter activity GO:0009977 molecular_function secondary active transmembrane transporter activity membrane protein