Transports adenine, hypoxanthine, xanthine and uracil. Transport is probably proton-dependent. Inhibited by the proton gradient disruptor carbonyl cyanide m-chlorophenylhydrazone (CCCP), but not by the sodium gradient disruptor ouabain. Belongs to the nucleobase:cation symporter-2 (NCS2) (TC 2.A.40) family. Azg-like subfamily.