Proton-dependent high-capacity transporter for uric acid. Shows also a low capacity for transport of xanthine at 37 degrees Celsius but not at 25 degrees Celsius. Inhibited in the presence of the protonophore carbonyl cyanide m-chlorophenyl hydrazone. Belongs to the nucleobase:cation symporter-2 (NCS2) (TC 2.A.40) family. Extended N-terminus.