Sodium-dependent amino acids transporter that has a broad substrate specificity, with a preference for zwitterionic amino acids. It accepts as substrates all neutral amino acids, including glutamine, asparagine, and branched-chain and aromatic amino acids, and excludes methylated, anionic, and cationic amino acids. Homotrimer. Highly expressed in adipose tissue, lower levels seen in lung. Not expressed in brain, kidney, liver or heart and only traces are detected in spleen, thymus and skeletal muscle. Expressed is induced during differentiation of preadipocytes into adipocytes. Belongs to the dicarboxylate/amino acid:cation symporter (DAACS) (TC 2.A.23) family. SLC1A5 subfamily.