Uric acid-xanthine transporter. Not detected in resting conidiospores. Transcription is activated during the isotropic growth phase of conidiospores. Inducible by 2-thiouric acid, and highly repressible by ammonium. Ubiquitinated by hulA. Ubiquitination leads to internalization, sorting into the endosomal pathway to the vacuolar lumen where uapA is eventually degraded. Belongs to the nucleobase:cation symporter-2 (NCS2) (TC 2.A.40) family. Extended N-terminus. Extended N-terminus.