neutral L-amino acid transmembrane transporter activity L-amino acid transmembrane transporter activity L-isoleucine transmembrane transporter activity leucine/isoleucine/valine porter activity isoleucine/valine:sodium symporter activity leucine/valine/isoleucine permease activity GO:0015188 Enables the transfer of L-isoleucine from one side of a membrane to the other. L-isoleucine is (2R*,3R*)-2-amino-3-methylpentanoic acid. L-isoleucine transporter activity molecular_function branched-chain amino acid transmembrane transporter activity