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Aliases ATP6AP1, 16A, ATP6IP1, ATP6S1, Ac45, CF2, VATPS1, XAP-3, XAP3, ATPase H+ transporting accessory protein 1
External IDs MGI: 109629 HomoloGene: 914 GeneCards: ATP6AP1
RNA expression pattern
PBB GE ATP6AP1 207809 s at fs.png
More reference expression data
Species Human Mouse
RefSeq (mRNA)



RefSeq (protein)



Location (UCSC) Chr X: 154.43 – 154.44 Mb Chr X: 74.3 – 74.3 Mb
PubMed search [1] [2]
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The human gene ATP6AP1 encodes the S1 subunit of the enzyme V-type proton ATPase.[3][4][5]

This gene encodes a component of a multisubunit enzyme (1 mDa MW) that mediates acidification of eukaryotic intracellular organelles. Vacuolar ATPase (V-ATPase) is composed of a cytosolic, V1, (site of the ATP catalytic site) and a transmembrane, V0, domain. V-ATPase dependent organelle acidification is necessary for such intracellular processes as protein sorting, zymogen activation, and receptor-mediated endocytosis. The encoded protein of this gene is approximately 45 kD and may assist in the V-ATPase-mediated acidification of neuroendocrine secretory granules.[5]


  1. ^ "Human PubMed Reference:". 
  2. ^ "Mouse PubMed Reference:". 
  3. ^ Chen EY, Zollo M, Mazzarella R, Ciccodicola A, Chen CN, Zuo L, Heiner C, Burough F, Repetto M, Schlessinger D, D'Urso M (Jun 1997). "Long-range sequence analysis in Xq28: thirteen known and six candidate genes in 219.4 kb of high GC DNA between the RCP/GCP and G6PD loci". Hum Mol Genet. 5 (5): 659–68. PMID 8733135. doi:10.1093/hmg/5.5.659. 
  4. ^ Sedlacek Z, Korn B, Konecki DS, Siebenhaar R, Coy JF, Kioschis P, Poustka A (Feb 1994). "Construction of a transcription map of a 300 kb region around the human G6PD locus by direct cDNA selection". Hum Mol Genet. 2 (11): 1865–9. PMID 8281148. doi:10.1093/hmg/2.11.1865. 
  5. ^ a b "Entrez Gene: ATP6AP1 ATPase, H+ transporting, lysosomal accessory protein 1". 

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