AC45 is an alias for the gene, ATPase, H+ transporting, lysosomal accessory protein 1, in humans. Other names include: V-type proton ATPase subunit S1; V-ATPase subunit S1; Protein XAP-3; V-ATPase Ac45 subunit; V-ATPase S1 accessory protein; Vacuolar proton pump subunit S1; 16A; ATP6IP1; ATP6S1; Ac45; CF2; VATPS1; XAP-3; XAP3. The encoded protein has an amino acid length of 470 and a mass of 52.0 kDa. Other isoforms may exist. AC45 is a member of the Vacuolar ATPase subunit S1 family. This gene shares homology with other species, including: Mouse, Rat, Zebrafish, Chicken.