Vacuolar ATPase Function and Regulation

Vacuolar ATPases (V-ATPases) are rotary, multi-subunit proton pumps that harness the energy of ATP hydrolysis to acidify intracellular compartments and, in specialised cells, the extracellular milieu. Structurally, these complexes comprise a peripheral V1 domain responsible for ATP hydrolysis and an integral V0 domain that translocates protons across membranes. Dynamic regulation of V-ATPase activity occurs through reversible assembly and disassembly of V1 and V0, modulation by accessory proteins, isoform-specific targeting to subcellular membranes and interaction with lipids. This regulation underpins essential processes including endocytic and secretory trafficking, lysosomal degradation, autophagy, glycoprotein processing and receptor recycling. Proton pumping by V-ATPases establishes pH gradients that drive secondary transport, regulate enzyme activation and contribute to organelle maturation. Tissue-specific subunit compositions confer specialised functions in osteoclast-mediated bone resorption, renal acid secretion, neuronal signalling and immune cell function. Dysregulation of V-ATPase assembly, localisation or proton-translocating kinetics has been implicated in a range of pathologies, from rare genetic glycosylation disorders and immunodeficiencies to cancer progression and neurodegenerative disease. Understanding the molecular determinants of V-ATPase regulation offers opportunities for targeted modulation of pH in physiological and pathological contexts.

Research from Nature Portfolio

High-resolution structural analyses have elucidated the precise binding mode of a macrolide inhibitor within the proton-translocating V0 c-ring, revealing how engagement of multiple macrolide molecules disrupts c-ring–subunit a interfaces and abrogates proton flux. These findings clarify conserved inhibitor-binding residues and inform the design of next-generation modulators of proton pumping. Complementary genetic and biochemical studies of a human accessory protein have identified it as the orthologue of a yeast V-ATPase assembly chaperone. Variants in this assembly factor produce tissue-specific defects in V-ATPase subunit processing and compartment-specific isoforms, leading to immunodeficiency, hepatopathy and cognitive impairment. This work establishes a direct link between regulated V-ATPase assembly and organ-specific physiology, highlighting the importance of assembly factor diversity in health and disease.

Vacuolar ATPase Function and Regulation publication trend

The graph below shows the total number of articles in vacuolar atpase function and regulation across all publications each year (not limited to Nature Index journals).

Technical terms

V1 domain: Cytoplasmic sector of V-ATPase that hydrolyses ATP to drive proton pumping.

V0 domain: Membrane-embedded sector of V-ATPase that translocates protons across lipid bilayers.

Reversible disassembly: Process by which V1 detaches from V0 to down-regulate proton-pumping activity.

TLDc domain: Protein fold found in regulators of oxidative stress and V-ATPase assembly.

Subunit isoform: Variant form of a V-ATPase subunit that directs pump localisation and function.

Proton motive force: Electrochemical gradient generated by proton translocation across membranes.

References

1. Yeast TLDc domain proteins regulate assembly state and subcellular localization of the V-ATPase. The EMBO Journal (2024).
2. Golgi pH elevation due to loss of V-ATPase subunit V0a2 function correlates with tissue-specific glycosylation changes and globozoospermia. Cellular and Molecular Life Sciences (2024).
3. ATP6AP1 deficiency causes an immunodeficiency with hepatopathy, cognitive impairment and abnormal protein glycosylation. Nature Communications (2016).
4. Molecular basis of V-ATPase inhibition by bafilomycin A1. Nature Communications (2021).
5. From Lysosomes to the Plasma Membrane LOCALIZATION OF VACUOLAR TYPE H+-ATPase WITH THE a3 ISOFORM DURING OSTEOCLAST DIFFERENTIATION*. Journal of Biological Chemistry (2003).
6. Regulation of the V-ATPase along the Endocytic Pathway Occurs through Reversible Subunit Association and Membrane Localization. PLOS ONE (2008).