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Aliases ATP6V0A4, A4, ATP6N1B, ATP6N2, RDRTA2, RTA1C, RTADR, STV1, VPH1, VPP2, ATPase H+ transporting V0 subunit a4
External IDs MGI: 2153480 HomoloGene: 39904 GeneCards: 50617
RNA expression pattern
PBB GE ATP6V0A4 220197 at tn.png
More reference expression data
Species Human Mouse
RefSeq (mRNA)



RefSeq (protein)



Location (UCSC) Chr 7: 138.71 – 138.8 Mb Chr 6: 38.05 – 38.12 Mb
PubMed search [1] [2]
View/Edit Human View/Edit Mouse

V-type proton ATPase 116 kDa subunit a isoform 4 is an enzyme that in humans is encoded by the ATP6V0A4 gene.[3][4][5]


This gene encodes a component of vacuolar ATPase (V-ATPase), a multisubunit enzyme that mediates acidification of intracellular compartments of eukaryotic cells. V-ATPase dependent acidification is necessary for such intracellular processes as protein sorting, zymogen activation, receptor-mediated endocytosis, and synaptic vesicle proton gradient generation. V-ATPase is composed of a cytosolic V1 domain and a transmembrane V0 domain. The V1 domain consists of three A and three B subunits, two G subunits plus the C, D, E, F, and H subunits. The V1 domain contains the ATP catalytic site. The V0 domain consists of five different subunits: a, c, c', c'', and d. This gene is one of four genes in man and mouse that encode different isoforms of the a subunit. Alternatively spliced transcript variants encoding the same protein have been described. Mutations in this gene are associated with renal tubular acidosis associated with preserved hearing.[5]


ATP6V0A4 has been shown to interact with PFKM.[6]


  1. ^ "Human PubMed Reference:". 
  2. ^ "Mouse PubMed Reference:". 
  3. ^ Karet FE, Finberg KE, Nayir A, Bakkaloglu A, Ozen S, Hulton SA, Sanjad SA, Al-Sabban EA, Medina JF, Lifton RP (Jan 2000). "Localization of a gene for autosomal recessive distal renal tubular acidosis with normal hearing (rdRTA2) to 7q33-34". Am. J. Hum. Genet. 65 (6): 1656–65. doi:10.1086/302679. PMC 1288376free to read. PMID 10577919.  Check date values in: |year= / |date= mismatch (help)
  4. ^ Smith AN, Skaug J, Choate KA, Nayir A, Bakkaloglu A, Ozen S, Hulton SA, Sanjad SA, Al-Sabban EA, Lifton RP, Scherer SW, Karet FE (Oct 2000). "Mutations in ATP6N1B, encoding a new kidney vacuolar proton pump 116-kD subunit, cause recessive distal renal tubular acidosis with preserved hearing". Nat. Genet. 26 (1): 71–5. doi:10.1038/79208. PMID 10973252. 
  5. ^ a b "Entrez Gene: ATP6V0A4 ATPase, H+ transporting, lysosomal V0 subunit a4". 
  6. ^ Su Y, Zhou A, Al-Lamki RS, Karet FE (May 2003). "The a-subunit of the V-type H+-ATPase interacts with phosphofructokinase-1 in humans". J. Biol. Chem. 278 (22): 20013–8. doi:10.1074/jbc.M210077200. PMID 12649290. 

Further reading[edit]