High-affinity permease for basic amino acids arginine, lysine and histidine (PubMed:8299168, PubMed:9180275). Degraded in the vacuole after internalization by endocytosis in a ubiquitin-dependent manner when expressed in S.cereviae (PubMed:10418152). Expression is induced during phagocytosis by host macrophages (PubMed:15470236). Expression is also induced during biofilm development (PubMed:19527170, PubMed:21414038, PubMed:22265407). Belongs to the amino acid-polyamine-organocation (APC) superfamily. YAT (TC 2.A.3.10) family.