solute:sodium symporter activity melibiose:monoatomic cation symporter activity melibiose:sodium symporter activity sodium/melibiose symporter activity melibiose carrier protein sodium-melibiose symporter activity GO:0043887 Na+:melibiose symporter activity molecular_function Enables the transfer of a solute or solutes from one side of a membrane to the other according to the reaction: melibiose(out) + Na+(out) = melibiose(in) + Na+(in). Na+/melibiose symporter activity melibiose/sodium symporter activity MelB melibiose-Na+ symporter activity Na+-melibiose symporter activity thiomethylgalactoside permease II Na+ (Li+)/melibiose symporter activity melibiose/Na+ symporter activity melibiose permease sodium:melibiose symporter activity melibiose:Na+ symporter activity melibiose-sodium symporter activity