solute:proton symporter activity 3-hydroxyphenyl propionate:proton symporter activity molecular_function GO:0015540 Enables the transfer of a solute or solutes from one side of a membrane to the other according to the reaction: 3-hydroxyphenyl propionate(out) + H+(out) = 3-hydroxyphenyl propionate(in) + H+(in). 3-hydroxyphenyl propionate:hydrogen ion symporter activity 3-hydroxyphenyl propionate porter activity 3-hydroxyphenyl propanoate transmembrane transporter activity