The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.
You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.
We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.
We are interested in where in or outside the cell the gene product carries out its function.
We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.
Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.
ATP6V1G3 (also known as ATP6G3) encodes the V-type proton ATPase subunit G3, one of three G-subunit isoforms (G1, G2, G3) in humans (wang2020pharmacologicaltargetingof pages 1-3). This gene produces the V-ATPase 13 kDa subunit 3, which is a component of the peripheral stalk of the vacuolar-type H+-ATPase (V-ATPase) complex (wang2020structuresofa pages 1-3, wang2020pharmacologicaltargetingof pages 1-3). The protein is designated UniProt Q96LB4 and belongs to the V-ATPase G subunit family (wang2020pharmacologicaltargetingof pages 1-3).
| Category | ATP6V1G3 summary | Evidence / notes |
|---|---|---|
| Gene name | ATP6V1G3 (synonym: ATP6G3) | Matches the requested human gene encoding V-type proton ATPase subunit G3; one of three human G-subunit isoforms of the V-ATPase V1 domain (wang2020structuresofa pages 1-3, chen2022thevatpasesin pages 1-2) |
| Protein name | V-type proton ATPase subunit G3; V-ATPase subunit G3; V-ATPase 13 kDa subunit 3 | G-subunit family member in the cytosolic V1 sector of the V-ATPase holoenzyme (wang2020structuresofa pages 1-3, chen2022thevatpasesin pages 1-2, futai2019vacuolartypeatpasea pages 1-3) |
| Organism | Homo sapiens | Human V-ATPase contains multiple subunit isoforms with tissue-dependent expression; ATP6V1G3 is the human kidney-enriched G isoform (wang2020pharmacologicaltargetingof pages 1-3, chen2022thevatpasesin pages 1-2) |
| Isoform specificity | G3 is the kidney-specific/enriched G-subunit isoform; by contrast G1 is ubiquitous and G2 is brain-specific | Explicitly reported in V1G-targeting study; human V-ATPases also contain multiple isoforms in different tissues and organelles (wang2020pharmacologicaltargetingof pages 1-3, wang2020structuresofa pages 1-3) |
| Tissue expression | Predominantly kidney; kidney-related expression signatures are also consistent with renal tumor transcriptomic studies and kidney cell-type markers | V1G-targeting work states ATP6V1G3 is uniquely expressed in kidney tissue; single-cell renal carcinoma profiling identifies ATP6V1G3 among marker genes for renal epithelial populations; chromophobe RCC studies place related V-ATPase lineage markers in distal nephron/intercalated cells (wang2020pharmacologicaltargetingof pages 1-3, skala2020nextgenerationrnasequencing–based pages 1-2) |
| Likely kidney cell context | Most consistent with renal epithelial acid-handling/endocytic compartments, especially distal nephron/intercalated-cell lineage and possibly proximal-tubule endolysosomal systems depending on V-ATPase subcomplex composition | Normal kidney lineage markers for chromophobe RCC map to distal nephron/intercalated cells; kidney V-ATPase biology strongly involves acid-secreting intercalated cells and proximal-tubule endocytic organelles, although ATP6V1G3 itself is not directly localized in those papers (eaton2021theh+atpase(vatpase) pages 5-9, skala2020nextgenerationrnasequencing–based pages 1-2, futai2019vacuolartypeatpasea pages 1-3) |
| Subcellular localization | As a V1 subunit, ATP6V1G3 is expected on the cytosolic/peripheral face of V-ATPase-positive membranes, associated with endosomes, lysosomes, Golgi/TGN, secretory vesicles, and in specialized cells potentially plasma membrane V-ATPases | V-ATPases acidify endosomes, lysosomes, Golgi, secretory vesicles, and can localize to plasma membrane in specialized cells; G subunits belong to the peripheral V1 stalk on the cytosolic side rather than the transmembrane proton pore (eaton2021theh+atpase(vatpase) pages 1-5, wang2020structuresofa pages 1-3, chen2022thevatpasesin pages 1-2, futai2019vacuolartypeatpasea pages 1-3, song2020theemergingroles pages 1-2) |
| Primary biochemical function | Does not itself catalyze proton transfer or ATP hydrolysis; instead it supports the activity of the V-ATPase holoenzyme that uses ATP hydrolysis in V1 to drive proton translocation through V0 | Core V-ATPase function is ATP-driven proton pumping for organelle/plasma-membrane acidification; G subunits are structural/regulatory components of V1 rather than catalytic ATP-binding A/B subunits or V0 proton-path subunits (eaton2021theh+atpase(vatpase) pages 1-5, wang2020structuresofa pages 1-3, chen2022thevatpasesin pages 1-2, futai2019vacuolartypeatpasea pages 1-3, song2020theemergingroles pages 1-2) |
| Immediate substrate/process context | Functional output is H+ transport by the assembled V-ATPase; ATP6V1G3 contributes indirectly to movement of protons into organellar lumens or across plasma membrane in specialized acid-secreting cells | V-ATPase creates an electrochemical proton gradient needed for vesicle/organelle acidification and extracellular acidification in specialized epithelia and osteoclasts (eaton2021theh+atpase(vatpase) pages 1-5, chen2022thevatpasesin pages 1-2, futai2019vacuolartypeatpasea pages 1-3) |
| Structural role in V-ATPase | Peripheral stalk subunit of the V1 complex; human V1 contains three copies of E and G subunits forming the three peripheral stalks that connect the catalytic head to the membrane sector and stabilize the rotary machine during catalysis | Human V-ATPase structures show E/G pairs in PS-1, PS-2, and PS-3; G participates in long curved coiled-coil peripheral stalks that accommodate conformational changes during ATP hydrolysis-coupled rotation (wang2020structuresofa pages 1-3) |
| Role in rotational catalysis | Helps provide the stator architecture that counterbalances torque generated by the rotary central stalk/c-ring system, enabling efficient coupling of ATP hydrolysis to proton pumping | Reviews and structures identify V1 peripheral stalks as required for efficient rotational catalysis and coupling between V1 and V0 (luca2021roleofthe pages 1-2, wang2020structuresofa pages 1-3, chen2022thevatpasesin pages 1-2, futai2019vacuolartypeatpasea pages 1-3) |
| Complex membership | Part of the V1 domain of the V-ATPase holoenzyme; mammalian V1 contains subunits A3B3CDE3FG3H in general architecture | Rat and human structural papers define V1 composition and show isoform-specific assembly in mammalian tissues (abbas2020structureofvatpase pages 1-2, wang2020structuresofa pages 1-3) |
| Key interacting proteins / complexes | Most direct partners are expected to be V1 subunit E within peripheral stalks and neighboring stator/collar components (C, H, a-NTD) in assembled V-ATPase; broader V-ATPase signaling interfaces involve ATP6AP1, ATP6AP2/(pro)renin receptor, Ragulator/mTOR machinery, and endolysosomal trafficking factors | Direct G3-specific interactors are not well defined in retrieved literature; structural work defines G within E/G peripheral stalks, while broader V-ATPase interactome includes signaling and assembly partners (wang2020structuresofa pages 1-3, abbas2020structureofvatpase pages 2-4, chen2022thevatpasesin pages 1-2, futai2019vacuolartypeatpasea pages 1-3) |
| Evidence from other G-isoform studies | For G1, interaction with RILP and RAB7 helps control V-ATPase localization/activation on late endosomes and lysosomes; these findings support a conserved trafficking-support role for G-family subunits, though they are not direct proof for G3 | Important inferential evidence only; the direct study is on ATP6V1G1 in breast cancer cells (luca2021roleofthe pages 1-2) |
| Canonical biological processes | Endosome/lysosome acidification, protein degradation, receptor-mediated endocytosis, vesicular trafficking, autophagy/lysosome function, secretory vesicle maturation, pH homeostasis | Canonical V-ATPase functions are extensively reviewed and apply to any competent isoform-containing holoenzyme, including kidney-enriched assemblies containing G3 (eaton2021theh+atpase(vatpase) pages 1-5, chen2022thevatpasesin pages 1-2, futai2019vacuolartypeatpasea pages 1-3, song2020theemergingroles pages 1-2) |
| Signaling-related roles | V-ATPase acts as a signaling hub/scaffold in mTORC1, Wnt, Notch, nutrient sensing, lysosomal stress responses, and broader pH-sensitive signaling pathways | These are properties of the assembled V-ATPase complex rather than uniquely of ATP6V1G3, but they define pathway context for ATP6V1G3-containing complexes (eaton2021theh+atpase(vatpase) pages 1-5, wang2020structuresofa pages 1-3, chen2022thevatpasesin pages 1-2, song2020theemergingroles pages 1-2) |
| Kidney-relevant functional context | In kidney, V-ATPases support acid-base homeostasis, distal nephron proton secretion, and proximal-tubule receptor-mediated endocytosis/endolysosomal function | Kidney V-ATPase localization and function are established in review and proximal-tubule ATP6AP2 studies; ATP6V1G3 likely contributes where kidney-specific V1G isoform-containing complexes are used (eaton2021theh+atpase(vatpase) pages 1-5, eaton2021theh+atpase(vatpase) pages 5-9, futai2019vacuolartypeatpasea pages 1-3) |
| Recent developments (2023–2024) | Recent work emphasizes V-ATPase in lysosome regeneration, lysosomal stress signaling, autophagy, and cancer biology; however, direct 2023–2024 ATP6V1G3-specific mechanistic studies are scarce | Newer papers focus on whole-complex regulation and disease roles rather than the G3 isoform specifically; this is an important limitation for annotation confidence (chen2022thevatpasesin pages 1-2, song2020theemergingroles pages 1-2) |
| Disease / cancer associations | ATP6V1G3 expression is reported in renal tumor datasets and may be downregulated in kidney renal clear cell carcinoma relative to normal kidney in some analyses; broader V-ATPase dysregulation is linked to cancer progression, metastasis, drug resistance, renal disease, osteopetrosis, and neurodegeneration | Family-level associations are strong; ATP6V1G3-specific disease causality remains limited in current literature (li2020comprehensiveanalysisof pages 1-2, coutovieira2020multicancervatpasemolecular pages 1-2, skala2020nextgenerationrnasequencing–based pages 1-2, chen2022thevatpasesin pages 1-2, song2020theemergingroles pages 1-2) |
| Pharmacology / therapeutic relevance | V-ATPase is druggable, and the V1G subunit family can be targeted pharmacologically; verucopeptin was reported to bind ATP6V1G and inhibit both V-ATPase activity and mTORC1 signaling in multidrug-resistant cancer models | The study does not establish G3-selective targeting, but it highlights the therapeutic relevance of the G-subunit family (wang2020pharmacologicaltargetingof pages 1-3) |
| Major knowledge gap | Very limited direct experimental literature on human ATP6V1G3; most functional annotation is inferred from (i) shared G-subunit architecture, (ii) V-ATPase holoenzyme biology, and (iii) kidney-specific expression of G3 | This should be stated explicitly when interpreting function/localization/pathway claims (wang2020structuresofa pages 1-3, wang2020pharmacologicaltargetingof pages 1-3, chen2022thevatpasesin pages 1-2) |
| Most useful references | Human V-ATPase structure and assembly: Wang 2020; mammalian brain structure: Abbas 2020; broad mechanistic review: Eaton 2021; V1G pharmacology and tissue specificity: Wang 2020 Cell Chem Biol; kidney/cancer expression resources: Li 2020, Skala 2020; lysosomal trafficking review: Futai 2019 | These references provide the strongest basis for annotating ATP6V1G3 despite the lack of G3-specific mechanistic studies (eaton2021theh+atpase(vatpase) pages 1-5, abbas2020structureofvatpase pages 1-2, wang2020structuresofa pages 1-3, wang2020pharmacologicaltargetingof pages 1-3, li2020comprehensiveanalysisof pages 1-2, skala2020nextgenerationrnasequencing–based pages 1-2, futai2019vacuolartypeatpasea pages 1-3) |
Table: This table consolidates the most relevant properties of human ATP6V1G3, combining direct evidence on V1G isoform specificity with broader structural and functional evidence from V-ATPase literature. It is useful for functional annotation because direct ATP6V1G3 studies are limited, so careful distinction between direct and inferred evidence is essential.
ATP6V1G3 is a structural and regulatory component of the V-ATPase, a large multisubunit proton pump that uses the energy of ATP hydrolysis to transport protons across cellular membranes (eaton2021theh+atpase(vatpase) pages 1-5, chen2022thevatpasesin pages 1-2, futai2019vacuolartypeatpasea pages 1-3). While ATP6V1G3 itself does not directly catalyze ATP hydrolysis or transport protons, it plays an essential structural role in the enzymatic complex that performs these functions (wang2020structuresofa pages 1-3).
The V-ATPase consists of two main domains: the cytosolic V1 domain (responsible for ATP hydrolysis) and the membrane-embedded V0 domain (responsible for proton translocation) (eaton2021theh+atpase(vatpase) pages 1-5, chen2022thevatpasesin pages 1-2). The mammalian V1 complex contains eight subunits in the stoichiometry A3B3CDE3FG3H, where ATP6V1G3 is one of the three G subunit copies (wang2020structuresofa pages 1-3). The V-ATPase operates as a rotary motor, where ATP hydrolysis at the A/B subunit interfaces drives rotation of a central stalk, which in turn drives proton translocation through the V0 domain (eaton2021theh+atpase(vatpase) pages 1-5, chen2022thevatpasesin pages 1-2, futai2019vacuolartypeatpasea pages 1-3).
ATP6V1G3, together with subunit E, forms one of three peripheral stalks (PS-1, PS-2, PS-3) in the V1 domain (wang2020structuresofa pages 1-3, wang2020structuresofa pages 3-5). These peripheral stalks are critical for the enzyme's function as they provide the stator architecture that counterbalances the torque generated by the rotating central stalk during ATP-driven proton pumping (luca2021roleofthe pages 1-2, wang2020structuresofa pages 1-3). Recent cryo-EM structures of human V-ATPase at 2.9-3.1 Å resolution reveal that the E/G subunits form long, curved coiled-coils at their N-terminal domains, with their C-terminal domains adopting a compact configuration that engages the B subunits of the catalytic hexamer (wang2020structuresofa pages 1-3, wang2020structuresofa pages 3-5).
The three peripheral stalks exhibit intrinsic structural plasticity with different overall curvatures despite having identical sequences, which allows them to accommodate the tilting and twisting of the A3B3 catalytic head during ATP binding and hydrolysis (wang2020structuresofa pages 1-3, wang2020structuresofa pages 3-5). This flexibility is essential for efficient rotational catalysis and coupling between ATP hydrolysis in V1 and proton pumping through V0 (luca2021roleofthe pages 1-2, wang2020structuresofa pages 1-3).
As a component of the peripheral stalk, ATP6V1G3 does not directly bind substrates or exhibit catalytic activity (wang2020structuresofa pages 1-3). Instead, it supports the function of the holoenzyme, which uses ATP as an energy source and transports protons (H+) as the immediate substrate (eaton2021theh+atpase(vatpase) pages 1-5, chen2022thevatpasesin pages 1-2, futai2019vacuolartypeatpasea pages 1-3). The V-ATPase creates an electrochemical proton gradient across membranes by pumping protons from the cytosol into the lumen of organelles or, in specialized cells, into the extracellular space (eaton2021theh+atpase(vatpase) pages 1-5, futai2019vacuolartypeatpasea pages 1-3).
ATP6V1G3 exhibits kidney-specific or kidney-enriched expression, distinguishing it from the other two G-subunit isoforms: ATP6V1G1 (ubiquitously expressed) and ATP6V1G2 (brain-specific) (wang2020pharmacologicaltargetingof pages 1-3). This tissue-specific expression pattern is consistent with the broader principle that V-ATPase subunits have multiple isoforms that are expressed in cell- and tissue-specific manners, enabling the enzyme to perform diverse physiological roles in different cellular contexts (eaton2021theh+atpase(vatpase) pages 1-5, futai2019vacuolartypeatpasea pages 1-3).
RNA sequencing studies of kidney tumors have identified ATP6V1G3 as a marker gene for renal epithelial cell populations (skala2020nextgenerationrnasequencing–based pages 1-2). In normal kidney tissue, lineage-specific V-ATPase markers, including related subunits, are expressed in the distal nephron, specifically in intercalated cells of the collecting duct system (skala2020nextgenerationrnasequencing–based pages 1-2). These acid-secreting cells use plasma membrane V-ATPases to maintain systemic acid-base homeostasis (eaton2021theh+atpase(vatpase) pages 1-5, futai2019vacuolartypeatpasea pages 1-3).
As a V1 domain subunit, ATP6V1G3 localizes to the cytosolic face of V-ATPase-containing membranes (wang2020structuresofa pages 1-3). The V-ATPase is ubiquitously present in intracellular organelles including endosomes, lysosomes, the Golgi apparatus/trans-Golgi network (TGN), and secretory vesicles, where it is responsible for maintaining the acidic pH required for proper organellar function (eaton2021theh+atpase(vatpase) pages 1-5, chen2022thevatpasesin pages 1-2, futai2019vacuolartypeatpasea pages 1-3, song2020theemergingroles pages 1-2).
In kidney epithelial cells, V-ATPases are found in both intracellular compartments and at the plasma membrane in specialized cell types (eaton2021theh+atpase(vatpase) pages 1-5, futai2019vacuolartypeatpasea pages 1-3). In the proximal tubule, V-ATPases participate in receptor-mediated endocytosis and endolysosomal function, facilitating the reabsorption of proteins and other molecules filtered by the kidney (eaton2021theh+atpase(vatpase) pages 5-9). In intercalated cells of the distal nephron and collecting duct, V-ATPases localize to the apical plasma membrane where they secrete protons into the tubular fluid for urinary acidification (eaton2021theh+atpase(vatpase) pages 1-5, futai2019vacuolartypeatpasea pages 1-3).
The V-ATPase-mediated acidification of endosomes and lysosomes is essential for numerous cellular processes, including protein degradation, receptor recycling, vesicular trafficking, and autophagy (eaton2021theh+atpase(vatpase) pages 1-5, chen2022thevatpasesin pages 1-2, song2020theemergingroles pages 1-2). Lysosomal pH gradients maintained by V-ATPase are required for the activation of resident hydrolytic enzymes such as cathepsins, which degrade internalized proteins and organelles (song2020theemergingroles pages 1-2). Disruption of V-ATPase activity impairs lysosomal acidification, leading to accumulation of undegraded substrates and cellular dysfunction (song2020theemergingroles pages 1-2).
The primary pathway involving ATP6V1G3-containing V-ATPase complexes is the acidification of intracellular compartments, which enables:
Protein degradation and autophagy: Lysosomal acidification activates proteolytic enzymes required for degradation of proteins, organelles, and other cellular components delivered via autophagy or endocytosis (chen2022thevatpasesin pages 1-2, song2020theemergingroles pages 1-2).
Receptor-mediated endocytosis: In kidney proximal tubule cells, V-ATPase acidification of early endosomes is necessary for the dissociation of ligands from receptors such as megalin and cubilin, enabling receptor recycling and ligand degradation (eaton2021theh+atpase(vatpase) pages 5-9).
Vesicular trafficking: The pH gradient established by V-ATPase regulates membrane fusion events and protein sorting along the endocytic and secretory pathways (eaton2021theh+atpase(vatpase) pages 1-5, futai2019vacuolartypeatpasea pages 1-3).
Beyond its role as a proton pump, the V-ATPase serves as a signaling hub and protein scaffold in several important pathways (eaton2021theh+atpase(vatpase) pages 1-5, chen2022thevatpasesin pages 1-2):
mTORC1 pathway: The V-ATPase functions as a nutrient sensor and serves as a docking platform for the Ragulator-Rag GTPase complex, which recruits and activates mTORC1 on lysosomal membranes in response to amino acid availability (eaton2021theh+atpase(vatpase) pages 1-5, chen2022thevatpasesin pages 1-2). This pathway is central to cellular growth, metabolism, and autophagy regulation.
AMPK pathway: V-ATPase activity influences AMPK signaling, which regulates cellular energy homeostasis (chen2022thevatpasesin pages 1-2).
Wnt and Notch signaling: V-ATPase components, particularly ATP6AP2 (pro-renin receptor), participate in Wnt signaling during stem cell maintenance and embryonic development, as well as Notch receptor processing (eaton2021theh+atpase(vatpase) pages 1-5, wang2020structuresofa pages 1-3).
Studies on the ATP6V1G1 isoform have demonstrated that G subunits interact with RILP (RAB-interacting lysosomal protein) and RAB7, which are key regulators of late endocytic traffic (luca2021roleofthe pages 1-2). These interactions control the localization and activation of V-ATPase on late endosomes and lysosomes (luca2021roleofthe pages 1-2). While direct evidence for ATP6V1G3 interactions is limited, the structural conservation among G-subunit isoforms suggests that ATP6V1G3 may participate in similar trafficking and regulatory mechanisms in kidney cells.
Recent cryo-EM studies have provided unprecedented structural detail of mammalian V-ATPases. Abbas et al. (2020) reported a 3.9 Å resolution structure of rat brain V-ATPase containing predominantly the G2 isoform, while Wang et al. (2020) determined human V-ATPase structures at 2.9-3.1 Å resolution containing the G1 isoform (abbas2020structureofvatpase pages 1-2, wang2020structuresofa pages 1-3, abbas2020structureofvatpase pages 2-4, wang2020structuresofa pages 3-5). These structures reveal the detailed architecture of the peripheral stalks containing G subunits and demonstrate their flexibility during the catalytic cycle (wang2020structuresofa pages 1-3, wang2020structuresofa pages 3-5).
V-ATPases have emerged as important players in cancer biology, with altered expression and activity contributing to tumor progression, metastasis, and drug resistance (chen2022thevatpasesin pages 1-2). Several studies have examined ATP6V1G3 expression in kidney cancers:
Li et al. (2020) conducted a comprehensive analysis of ATP6V1 family members in kidney renal clear cell carcinoma (KIRC) and found that ATP6V1G3 was downregulated in KIRC tissues compared to normal kidney (li2020comprehensiveanalysisof pages 1-2).
Skala et al. (2020) used RNA sequencing to characterize biomarkers in chromophobe renal cell carcinoma and identified ATP6V1G3 among genes differentially expressed in renal tumor types (skala2020nextgenerationrnasequencing–based pages 1-2).
Wang et al. (2020) demonstrated that the natural product verucopeptin can directly target ATP6V1G subunits to inhibit both V-ATPase activity and mTORC1 signaling in multidrug-resistant cancer cells (wang2020pharmacologicaltargetingof pages 1-3). While this study did not specifically target the G3 isoform, it highlights the therapeutic potential of modulating V-ATPase G-subunit function.
Recent reviews (2020-2024) have emphasized the critical role of V-ATPase in lysosomal acidification and its involvement in neurodegenerative diseases, lysosomal storage disorders, and autophagy-related pathologies (chen2022thevatpasesin pages 1-2, song2020theemergingroles pages 1-2). Chen et al. (2022, 2024) highlighted V-ATPase dysfunction in cancer progression and cell death pathways including apoptosis, ferroptosis, and lysosome-dependent cell death (chen2022thevatpasesin pages 1-2). These findings underscore the importance of proper V-ATPase function across multiple disease contexts.
Duan et al. (2018) analyzed genetic variants in all V-ATPase subunits using the GEFOS (Genetic Factors for Osteoporosis) dataset and identified ATP6V1G3 variants as potentially related to bone density, though the functional significance of these associations requires further validation (duan2018vatpasesandosteoclasts pages 1-2).
A critical limitation in the current literature is the scarcity of direct experimental studies specifically focused on ATP6V1G3. Most functional annotations for this gene are inferred from:
Direct mechanistic studies examining the specific roles of ATP6V1G3 in kidney physiology, the consequences of its depletion or mutation, and its interactions with kidney-specific regulatory proteins are needed to fully understand this gene's function.
ATP6V1G3 encodes a kidney-enriched isoform of the V-ATPase G subunit, which functions as a critical structural component of the peripheral stalk in the V1 domain of the V-ATPase proton pump (wang2020structuresofa pages 1-3, wang2020pharmacologicaltargetingof pages 1-3). As part of this complex, ATP6V1G3 contributes to ATP-driven proton transport across membranes, acidifying intracellular organelles such as endosomes and lysosomes in kidney epithelial cells (eaton2021theh+atpase(vatpase) pages 1-5, chen2022thevatpasesin pages 1-2, futai2019vacuolartypeatpasea pages 1-3). This acidification is essential for protein degradation, autophagy, receptor-mediated endocytosis, and cellular pH homeostasis (eaton2021theh+atpase(vatpase) pages 1-5, chen2022thevatpasesin pages 1-2, song2020theemergingroles pages 1-2).
Beyond its role as a proton pump component, ATP6V1G3-containing V-ATPase complexes participate in signaling pathways including mTORC1 and AMPK, serving as nutrient sensors and protein scaffolds (eaton2021theh+atpase(vatpase) pages 1-5, chen2022thevatpasesin pages 1-2). Recent structural studies have provided detailed insights into the architecture and flexibility of G-subunit-containing peripheral stalks, revealing how they enable efficient coupling between ATP hydrolysis and proton pumping (wang2020structuresofa pages 1-3, wang2020structuresofa pages 3-5).
ATP6V1G3 expression is altered in kidney cancers and may have roles in disease pathogenesis, though direct mechanistic evidence remains limited (li2020comprehensiveanalysisof pages 1-2, skala2020nextgenerationrnasequencing–based pages 1-2). The G-subunit family represents a potential therapeutic target, as demonstrated by small molecules that can modulate V-ATPase activity through G-subunit binding (wang2020pharmacologicaltargetingof pages 1-3). Future research should focus on elucidating the specific functions of ATP6V1G3 in kidney physiology and disease, as well as exploring isoform-selective therapeutic strategies.
References
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