V-ATPase subunit VHA-a3 The protein is essential component of the vacuolar proton pump (V-ATPase), a multimeric enzyme that catalyzes the translocation of protons across the membranes and required for assembly and activity of the V-ATPase. Involved in vacuolar nutrient storage (e.g. accumulation and storage of nitrate) and in tolerance to some toxic ions (e.g. zinc ions sequestration in vacuoles). Alternative names: V-type proton ATPase 95 kDa subunit a isoform 3, V-ATPase 95 kDa isoform a3, Vacuolar H(+)-ATPase subunit a isoform 3, Vacuolar proton pump subunit a3, Vacuolar proton translocating ATPase 95 kDa subunit a isoform 3.
