{"gene":"VDAC3","run_date":"2026-04-28T23:00:23","timeline":{"discoveries":[{"year":2004,"finding":"VDAC2 and VDAC3 (but not VDAC1) are abundant structural proteins in bovine sperm outer dense fibers (ODF), a cytoskeletal component of the flagellum, localizing outside of mitochondria and suggesting a non-channel structural role in sperm.","method":"Peptide sequencing of purified ODF proteins, isoform-specific antibodies, immunoblot, immunofluorescence microscopy, and transmission electron immunomicroscopy","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal antibody validation, multiple orthogonal localization methods, replicated across techniques","pmids":["14739283"],"is_preprint":false},{"year":1998,"finding":"VDAC3 exists as two isoforms generated by tissue-specific alternative splicing of a 3-base exon encoding Met39; both isoforms localize to mitochondria in transfected mammalian cells, and the Met39 residue modulates VDAC3 channel function as shown by complementation of YVDAC-deficient yeast.","method":"cDNA cloning, transfection with fluorescent/epitope-tagged constructs, yeast complementation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — direct subcellular localization plus functional complementation with mutagenesis variant","pmids":["9804816"],"is_preprint":false},{"year":2010,"finding":"VDAC3 has limited ability to complement porin-less yeast for mitochondrial respiration and has no influence on ROS control, unlike VDAC1 and VDAC2; over-expression of VDAC3 causes dramatic sensitivity to oxidative stress and shorter lifespan under respiratory conditions.","method":"Yeast complementation assay, real-time PCR, yeast survival/aging assays","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 2 — functional genetic complementation with multiple phenotypic readouts across isoforms","pmids":["20138821"],"is_preprint":false},{"year":2010,"finding":"Swapping the VDAC3 N-terminal 20 amino acids with those from VDAC1 fully restores mitochondrial respiration complementation activity and ROS modulation in porin-less yeast, and extends yeast lifespan, establishing the N-terminus as the key functional determinant distinguishing VDAC3 from VDAC1.","method":"N-terminal domain swap chimeras, yeast complementation assay, ROS measurement, lifespan assay","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1 — domain-swap mutagenesis with multiple orthogonal functional readouts","pmids":["20434446"],"is_preprint":false},{"year":2010,"finding":"In VDAC3-deficient mice, cardiac mitochondria show decreased apparent affinity for ADP and a specific defect in respiratory complex IV activity, whereas gastrocnemius muscle mitochondria ADP affinity is unaffected; structural aberrations of mitochondria correlate with these functional changes, demonstrating muscle-type specificity of VDAC3 function in vivo.","method":"VDAC3 knockout mice, in situ mitochondrial respiration, respiratory enzyme activity assays, electron microscopy","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 2 — knockout model with defined biochemical phenotypes and structural correlation","pmids":["20875390"],"is_preprint":false},{"year":2012,"finding":"VDAC3 is present at the mother centriole and recruits the Mps1 kinase to centrosomes by directly binding the centrosome localization domain of Mps1, thereby modulating centriole assembly.","method":"Co-immunoprecipitation, confocal imaging, centrosome localization domain mapping, RNAi knockdown with centriole assembly phenotype","journal":"Cell cycle (Georgetown, Tex.)","confidence":"High","confidence_rationale":"Tier 2 — reciprocal binding assay, direct localization, and functional rescue experiment","pmids":["22935710"],"is_preprint":false},{"year":2013,"finding":"VDAC3 depletion causes inappropriate ciliogenesis in cycling cells, and VDAC3 overexpression suppresses ciliogenesis in quiescent cells; the VDAC3-Mps1 module at the centrosome promotes ciliary disassembly during cell cycle entry, placing VDAC3 as a negative regulator of primary cilia assembly.","method":"RNAi knockdown, GFP-VDAC3 overexpression, immunofluorescence-based cilia quantification, epistasis with Mps1 targeting","journal":"Cell cycle (Georgetown, Tex.)","confidence":"High","confidence_rationale":"Tier 2 — loss-of-function and gain-of-function with defined cellular phenotype and epistasis","pmids":["23388454"],"is_preprint":false},{"year":2015,"finding":"VDAC3 gating activity is activated by reducing agents (DTT) and S-nitrosoglutathione (GSNO), and by cysteine-to-alanine mutations, indicating that an intramolecular disulfide bond between the N-terminal region and the bottom of the pore suppresses VDAC3 channel gating under oxidizing conditions.","method":"Recombinant protein reconstitution into planar lipid bilayers, redox agent treatment, site-directed cysteine mutagenesis, single-channel electrophysiology","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 1 — reconstituted in vitro electrophysiology combined with mutagenesis","pmids":["26407725"],"is_preprint":false},{"year":2016,"finding":"VDAC3 cysteines (particularly Cys2/Cys8, which can form a disulfide bridge) and Cys122 are in different oxidation states in native mitochondria and regulate pore stability and conductance; the protein acts as a redox sensor reporting oxidative conditions in the mitochondrial intermembrane space.","method":"Mass spectrometry of native and recombinant VDAC3, site-directed mutagenesis of individual cysteines, SDS-PAGE mobility shift, electrophysiology, yeast complementation, circular dichroism","journal":"Oncotarget","confidence":"High","confidence_rationale":"Tier 1 — multiple orthogonal methods (MS, mutagenesis, electrophysiology, complementation) in a single study","pmids":["26760765"],"is_preprint":false},{"year":2016,"finding":"High-resolution mass spectrometry of rat liver mitochondrial VDAC3 reveals that cysteines 36, 65, 165, and 229 are oxidized to sulfonic acid, while methionines are oxidized to methionine sulfoxide, consistent with VDAC3 being exposed to a strongly oxidizing intermembrane space environment.","method":"SDS-PAGE, tryptic/chymotryptic digestion, UHPLC/High Resolution ESI-MS/MS","journal":"Biochimica et biophysica acta. Biomembranes","confidence":"High","confidence_rationale":"Tier 1 — direct chemical characterization of PTMs on native protein","pmids":["27989743"],"is_preprint":false},{"year":2014,"finding":"VDAC3 localizes to mitochondria in HeLa cells and interacts with cytoskeletal proteins (tubulins), stress sensors, chaperones, proteasome components, and redox enzymes including protein disulfide isomerase, suggesting VDAC3 acts as an organizer of protein complexes involved in ROS homeostasis and protein quality control.","method":"Stable cell line with dual-tagged VDAC3, tandem-affinity purification, 2D gel electrophoresis, mass spectrometry, live-cell imaging, immunoprecipitation validation","journal":"Molecular bioSystems","confidence":"High","confidence_rationale":"Tier 2 — systematic interactome with MS followed by immunoprecipitation validation","pmids":["24865465"],"is_preprint":false},{"year":2020,"finding":"VDAC3 forms stable, highly conductive, weakly anion-selective voltage-gated channels similar to VDAC1, but interacts with cytosolic proteins α-synuclein and tubulin with 10–100-fold reduced on-rates; cysteine scanning mutagenesis shows VDAC3's cysteine residues regulate interaction with α-synuclein, demonstrating isoform-specific cytosolic protein regulation.","method":"Recombinant protein reconstitution in planar lipid bilayers, single-channel electrophysiology, cysteine-scanning mutagenesis","journal":"The Journal of general physiology","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with mutagenesis and quantitative binding kinetics","pmids":["31935282"],"is_preprint":false},{"year":2022,"finding":"VDAC3 depletion significantly exacerbates cytotoxicity of redox cyclers (menadione, paraquat) and complex I inhibitors (rotenone), causing uncontrolled mitochondrial ROS accumulation; high-resolution respirometry shows that VDAC3 cysteines are indispensable for its ability to counteract ROS-induced oxidative stress.","method":"VDAC3 knockdown/knockout (HAP1-ΔVDAC3 cells), cysteine-null VDAC3 mutant complementation, high-resolution respirometry, ROS measurement","journal":"Redox biology","confidence":"High","confidence_rationale":"Tier 1–2 — KO phenotype with cysteine-null rescue and respirometry","pmids":["35180474"],"is_preprint":false},{"year":2021,"finding":"FBXW7 functions as an E3 ubiquitin ligase for VDAC3, mediating its ubiquitination and proteasomal degradation; autophagy activation (rapamycin) increases VDAC3 degradation via this pathway and sensitizes leukemia cells to erastin-induced ferroptosis.","method":"Immunoprecipitation, UbiBrowser prediction followed by experimental confirmation, lentiviral knockdown/overexpression, xenograft model","journal":"Frontiers in cell and developmental biology","confidence":"High","confidence_rationale":"Tier 2 — E3 ligase identified by co-IP with functional manipulation and in vivo validation","pmids":["34869326"],"is_preprint":false},{"year":2022,"finding":"The BDNF-AS lncRNA recruits WDR5 to enhance FBXW7 transcription; FBXW7 then ubiquitinates VDAC3 to reduce its protein level, thereby protecting gastric cancer cells from ferroptosis.","method":"ChIRP, RIP, ChIP, co-IP, in vivo xenograft model, qRT-PCR","journal":"International journal of biological sciences","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal biochemical methods establishing the BDNF-AS/WDR5/FBXW7/VDAC3 axis","pmids":["35280682"],"is_preprint":false},{"year":2022,"finding":"Enteroviral 2B protein directly interacts with VDAC3; VDAC3 knockdown suppresses enterovirus 71 replication and reduces virus-induced mitochondrial ROS generation, establishing VDAC3 as an essential host factor for enteroviral ROS-dependent replication.","method":"Co-immunoprecipitation-proteomic analysis, siRNA knockdown, single-round viral replication assay, mitochondrial ROS measurement","journal":"Viruses","confidence":"High","confidence_rationale":"Tier 2 — proteomic identification plus functional KD with defined ROS and replication phenotype","pmids":["36016340"],"is_preprint":false},{"year":2023,"finding":"Dankastatin B covalently targets Cys65 of VDAC3 in breast cancer cells; VDAC3 knockdown confers hypersensitivity to dankastatin B-mediated antiproliferative effects, indicating VDAC3 is at least partially responsible for the drug's anticancer mechanism.","method":"Activity-based protein profiling chemoproteomic approach, covalent interaction validation, siRNA knockdown, antiproliferative assays","journal":"Chembiochem : a European journal of chemical biology","confidence":"High","confidence_rationale":"Tier 1–2 — chemoproteomic site identification confirmed with KD phenotype","pmids":["36964942"],"is_preprint":false},{"year":2019,"finding":"The β7–β9 strand region of hVDAC3 is highly aggregation prone; an α1–β7–β9 interaction (involving the N-terminal α-helix) suppresses aggregation, and perturbation of this interaction promotes aggregation through a partially unfolded intermediate.","method":"Systematic cysteine thiol-replacement mutagenesis, far-UV circular dichroism, UV scattering spectroscopy","journal":"The Journal of general physiology","confidence":"High","confidence_rationale":"Tier 1 — systematic mutagenesis with biophysical characterization mapping aggregation mechanism","pmids":["30674561"],"is_preprint":false},{"year":2022,"finding":"Specific post-translational modifications of VDAC3 in ALS-SOD1 model cells include over-oxidation, deamidation, and succination at specific residues; deamidation of Asn215 alone alters single-channel behavior in artificial membranes, demonstrating that disease-related oxidative PTMs functionally impact VDAC3.","method":"nUHPLC/High-Resolution nESI-MS/MS of enriched VDAC3 from NSC34-SOD1G93A cells, planar lipid bilayer electrophysiology of deamidated mutant","journal":"International journal of molecular sciences","confidence":"High","confidence_rationale":"Tier 1 — direct mass spectrometric PTM identification with functional electrophysiological validation","pmids":["36555496"],"is_preprint":false},{"year":2024,"finding":"SPOP functions as an E3 ubiquitin ligase that ubiquitinates and degrades VDAC3; ALKBH5 demethylase reduces SPOP mRNA stability (via m6A in 3'UTR), decreasing SPOP-mediated VDAC3 degradation and promoting ferroptosis; IGF2BP2 stabilizes SPOP mRNA to inhibit ferroptosis, placing VDAC3 downstream of ALKBH5/IGF2BP2/SPOP axis in diabetic cardiomyopathy.","method":"Co-immunoprecipitation, ubiquitination assay, m6A modification analysis, RIP, mRNA stability assay in cardiomyocytes","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 — mechanistic axis identified by multiple biochemical assays but single lab","pmids":["39549880"],"is_preprint":false},{"year":2025,"finding":"ALKBH5 m6A demethylase reduces VDAC3 mRNA stability by decreasing m6A modification, and YTHDF1 acts as the m6A reader that enhances VDAC3 mRNA stability; VDAC3 overexpression reduces etoposide-induced cellular senescence and promotes osteogenic differentiation in bone mesenchymal stromal cells.","method":"RIP assay, luciferase reporter, Me-RIP (m6A methylation analysis), Western blot, alkaline phosphatase and alizarin red S staining","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — m6A modification writer/eraser/reader identified with functional cellular readout, single lab","pmids":["39379688"],"is_preprint":false},{"year":2025,"finding":"Trim15 E3 ubiquitin ligase stabilizes VDAC3 via K6-linked ubiquitination (rather than promoting degradation), suppressing autophagy/mitophagy and elevating ROS; VDAC3 knockdown enhances autophagy and reduces ROS, defining a Trim15-VDAC3-mitophagy axis in hypopharyngeal squamous cell carcinoma.","method":"Co-immunoprecipitation, ubiquitination linkage analysis, siRNA knockdown, flow cytometry for ROS/mitophagy, xenograft model","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 — K6-ubiquitin linkage identified with functional phenotype, single lab","pmids":["41617671"],"is_preprint":false},{"year":2025,"finding":"Cardiolipin uniquely retains hVDAC3 in an open-like conductive state, while anionic headgroups, negative protein-bilayer mismatch, and increased membrane viscosity optimize channel stability; lipid composition selectively modulates hVDAC3 N-terminal helix dynamics without altering global β-barrel fold.","method":"Single-channel electrophysiology, all-atom molecular dynamics simulations, systematic lipid variation","journal":"Protein science : a publication of the Protein Society","confidence":"High","confidence_rationale":"Tier 1 — single-channel electrophysiology combined with MD simulations providing mechanistic detail","pmids":["41575209"],"is_preprint":false},{"year":2025,"finding":"In yeast lacking endogenous VDACs and superoxide dismutases, hVDAC3 (but not hVDAC1 or hVDAC2) maintains mitochondrial membrane potential, morphology, and efficient ATP synthesis under oxidative stress; cysteine-depleted hVDAC3 loses this protective function, confirming that hVDAC3 cysteines are essential for oxidative stress protection.","method":"Heterologous expression in yeast strains lacking POR1/POR2 and SOD1/SOD2, growth assays, mitochondrial membrane potential measurement, bioenergetic profiling","journal":"Biochimica et biophysica acta. Bioenergetics","confidence":"High","confidence_rationale":"Tier 1 — reconstitution-like genetic complementation with cysteine-null mutant and multiple bioenergetic phenotypic readouts","pmids":["40588209"],"is_preprint":false},{"year":2025,"finding":"Mass spectrometry characterization of rat VDAC3 revealed three intramolecular disulfide bonds and seven intermolecular disulfide bonds between rVDAC3 and rVDAC1 or rVDAC2, demonstrating that disulfide bridges directly mediate homo- and hetero-oligomerization of VDAC isoforms.","method":"UHPLC/High Resolution ESI-MS/MS after enzymatic digestion; non-reducing conditions to preserve disulfide bonds","journal":"Analytical and bioanalytical chemistry","confidence":"High","confidence_rationale":"Tier 1 — direct structural characterization of disulfide bonds by high-resolution MS","pmids":["40875006"],"is_preprint":false},{"year":2025,"finding":"VDAC3 KO in HeLa cells dramatically downregulates key electron transport chain members and shifts mitochondria to glutamine-dependent metabolism, demonstrating a non-redundant role of VDAC3 (not compensated by VDAC1/VDAC2) in supporting ETC function and cancer cell metabolic adaptability.","method":"VDAC3 knockout HeLa cells, comparative proteomics, respirometry, metabolic flux analysis","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — KO with proteomics and respirometry, but preprint only","pmids":["bio_10.1101_2025.02.20.639106"],"is_preprint":true},{"year":2034,"finding":"ACSL4 interacts with both ZIP7 (ER iron efflux channel) and VDAC3 (mitochondrial iron influx channel) at ER-mitochondria contact sites; VDAC3 knockdown reverses mitochondrial iron overload under PFOS exposure, establishing VDAC3 as a mitochondrial iron influx channel regulated by ACSL4-mediated ZIP7-VDAC3 interaction.","method":"Co-immunoprecipitation of ACSL4-VDAC3 in mouse liver and L-02 cells, siRNA knockdown of VDAC3, iron measurement","journal":"The Science of the total environment","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP plus functional KD with defined iron transport phenotype, single lab","pmids":["39579909"],"is_preprint":false}],"current_model":"VDAC3 is a β-barrel pore-forming protein of the mitochondrial outer membrane whose unique set of cysteine residues (forming intra- and intermolecular disulfide bonds) renders it a redox sensor of the intermembrane space, regulating channel gating, ROS homeostasis, and VDAC oligomerization; it interacts with cytosolic regulators (α-synuclein, tubulin) with isoform-specific kinetics, is uniquely required for maintaining electron transport chain integrity and protecting mitochondria from oxidative stress in a cysteine-dependent manner, is also present at the mother centriole where it recruits Mps1 kinase to regulate centriole assembly and suppress ciliogenesis, and its protein levels are controlled post-translationally by multiple E3 ubiquitin ligases (FBXW7, SPOP, Trim15) and m6A mRNA modification (ALKBH5/YTHDF1 axis), linking it to ferroptosis, autophagy, and mitophagy regulation."},"narrative":{"teleology":[{"year":1998,"claim":"Identification that VDAC3 exists as tissue-specific splice isoforms differing by Met39, both targeting to mitochondria and capable of complementing yeast porin function, established VDAC3 as a functional mitochondrial channel with regulated diversity.","evidence":"cDNA cloning, tagged-construct transfection, yeast complementation of YVDAC-deficient strain","pmids":["9804816"],"confidence":"High","gaps":["Human tissue-specific expression pattern of splice variants not mapped","No electrophysiological characterization of channel properties at this stage"]},{"year":2004,"claim":"Discovery of VDAC3 as a structural component of sperm outer dense fibers revealed an extramitochondrial role, expanding the functional repertoire beyond channel activity.","evidence":"Peptide sequencing of purified bovine sperm ODF, isoform-specific antibodies, immunoelectron microscopy","pmids":["14739283"],"confidence":"High","gaps":["Structural role in ODF not mechanistically defined","Whether ODF-associated VDAC3 retains channel activity unknown"]},{"year":2010,"claim":"Systematic isoform comparison in yeast and knockout mice revealed that VDAC3 is functionally distinct from VDAC1/VDAC2: it poorly complements respiratory growth, sensitizes cells to oxidative stress, and its N-terminal 20 residues are the key determinant of these isoform-specific differences, while mouse knockouts showed tissue-specific defects in complex IV activity.","evidence":"Yeast complementation with domain-swap chimeras, ROS and lifespan assays; VDAC3 KO mouse respirometry, enzyme activity, electron microscopy","pmids":["20138821","20434446","20875390"],"confidence":"High","gaps":["Molecular basis of N-terminal functional specificity at atomic resolution not resolved","Mechanism linking VDAC3 to complex IV activity unknown"]},{"year":2012,"claim":"Discovery that VDAC3 localizes to the mother centriole and recruits Mps1 kinase to suppress ciliogenesis established a completely unexpected non-mitochondrial function in cell cycle-coupled centriole regulation.","evidence":"Co-IP, confocal imaging, RNAi knockdown/overexpression with cilia quantification, epistasis with Mps1","pmids":["22935710","23388454"],"confidence":"High","gaps":["How VDAC3 is targeted to the centriole versus mitochondria not determined","Whether centriolar VDAC3 retains channel-forming ability unknown"]},{"year":2014,"claim":"Systematic interactome mapping in HeLa cells identified VDAC3 interactions with tubulins, chaperones, proteasome components, and redox enzymes including protein disulfide isomerase, suggesting a scaffold function integrating ROS homeostasis and protein quality control.","evidence":"Tandem-affinity purification of dual-tagged VDAC3, 2D gel/MS, immunoprecipitation validation","pmids":["24865465"],"confidence":"High","gaps":["Direct versus indirect interactions not fully resolved for all partners","Functional significance of individual interactions not tested"]},{"year":2016,"claim":"In vitro electrophysiology and mass spectrometry established that VDAC3 cysteines exist in multiple oxidation states in native mitochondria and form disulfide bonds that suppress channel gating, directly demonstrating VDAC3 functions as a redox sensor of the intermembrane space.","evidence":"Reconstituted planar lipid bilayer electrophysiology with redox agents and cysteine mutagenesis; UHPLC/HR-MS of native rat liver VDAC3","pmids":["26407725","26760765","27989743"],"confidence":"High","gaps":["In vivo confirmation that redox-dependent gating changes affect metabolite flux not obtained","Specific IMS redox couples regulating VDAC3 cysteines not identified"]},{"year":2019,"claim":"Mapping of aggregation-prone regions to β7–β9 strands and the stabilizing role of the α1–β7–β9 interaction provided the first biophysical account of how the N-terminal helix maintains VDAC3 fold stability, explaining why N-terminal perturbations are so functionally consequential.","evidence":"Systematic cysteine-to-thiol mutagenesis with CD and UV scattering spectroscopy","pmids":["30674561"],"confidence":"High","gaps":["No high-resolution atomic structure of hVDAC3 determined experimentally","Aggregation intermediates not characterized in a membrane environment"]},{"year":2020,"claim":"Quantitative comparison showed VDAC3 forms channels similar to VDAC1 in conductance and selectivity but interacts with α-synuclein and tubulin with 10–100-fold lower on-rates, with cysteines regulating these interactions, establishing isoform-specific cytosolic protein recognition.","evidence":"Recombinant reconstitution in planar lipid bilayers, cysteine-scanning mutagenesis, single-channel kinetics","pmids":["31935282"],"confidence":"High","gaps":["Physiological consequence of reduced α-synuclein/tubulin binding in vivo not established","Whether cysteine oxidation state modulates these interactions under physiological conditions untested"]},{"year":2021,"claim":"Identification of FBXW7 as the first E3 ubiquitin ligase targeting VDAC3 for proteasomal degradation connected VDAC3 protein levels to autophagy and ferroptosis sensitivity in leukemia cells.","evidence":"Co-IP, ubiquitination assay, lentiviral manipulation, xenograft model","pmids":["34869326"],"confidence":"High","gaps":["Specific ubiquitination sites on VDAC3 not mapped","Whether FBXW7-VDAC3 axis operates in non-cancer contexts unknown"]},{"year":2022,"claim":"Multiple studies converged to show that VDAC3 cysteines are indispensable for protecting mitochondria from ROS-induced damage: VDAC3 knockout exacerbated redox cycler toxicity and a cysteine-null mutant failed to rescue, while disease-associated PTMs (over-oxidation, deamidation) alter channel function, and the BDNF-AS/FBXW7 axis regulates VDAC3 levels in gastric cancer ferroptosis.","evidence":"KO/cysteine-null complementation in HAP1 cells with respirometry; HR-MS of VDAC3 from ALS-SOD1 model; BDNF-AS/WDR5/FBXW7 ChIRP/RIP/ChIP in gastric cancer","pmids":["35180474","36555496","35280682"],"confidence":"High","gaps":["How specific cysteine oxidation states individually contribute to ROS protection not dissected","Whether VDAC3 deamidation occurs in human ALS patients not confirmed"]},{"year":2025,"claim":"Recent work completed the mechanistic picture by showing VDAC3 cysteines form defined intra- and intermolecular disulfide bonds mediating VDAC oligomerization, cardiolipin selectively stabilizes the open state by modulating N-terminal dynamics, VDAC3 is uniquely required under oxidative stress for mitochondrial membrane potential and ATP synthesis, and additional E3 ligases (SPOP, Trim15) and m6A regulators control VDAC3 levels linking it to mitophagy and ferroptosis.","evidence":"HR-MS under non-reducing conditions; single-channel electrophysiology with lipid variation and MD simulations; yeast complementation lacking SODs; Co-IP/ubiquitination/m6A analysis","pmids":["40875006","41575209","40588209","39549880","41617671","39379688"],"confidence":"High","gaps":["High-resolution experimental structure of hVDAC3 still lacking","In vivo significance of VDAC hetero-oligomerization via disulfide bonds untested","Relative contributions of transcriptional, m6A, and ubiquitin-mediated regulation of VDAC3 in different tissues not compared"]},{"year":null,"claim":"Key open questions include the atomic-resolution structure of hVDAC3, the mechanism by which VDAC3 is differentially targeted to centrioles versus mitochondria, whether cysteine-dependent redox sensing directly controls metabolite flux in vivo, and how the multiple E3 ligase and m6A regulatory inputs are integrated to set VDAC3 protein levels in different physiological and disease contexts.","evidence":"","pmids":[],"confidence":"Low","gaps":["No experimental high-resolution structure of hVDAC3","Dual localization mechanism (mitochondria vs. centriole) unresolved","In vivo metabolite flux through VDAC3 not measured"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[1,7,8,11,22]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[7,8,9,12,23]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[1,4,9,10,12]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[5,6]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[7,8,12,23]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[4,25]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[13,14]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[21]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[5,6]}],"complexes":["VDAC1-VDAC3 hetero-oligomer","VDAC2-VDAC3 hetero-oligomer"],"partners":["TTK","FBXW7","SPOP","TRIM15","SNCA","ACSL4","VDAC1","VDAC2"],"other_free_text":[]},"mechanistic_narrative":"VDAC3 is a β-barrel voltage-dependent anion channel of the mitochondrial outer membrane that functions as a redox-sensitive regulator of mitochondrial integrity, ROS homeostasis, and inter-organellar signaling. Its unique complement of cysteine residues forms intra- and intermolecular disulfide bonds that gate channel conductance under oxidizing conditions, mediate homo- and hetero-oligomerization with VDAC1/VDAC2, and are indispensable for protecting mitochondria from oxidative stress and maintaining electron transport chain function [PMID:26407725, PMID:26760765, PMID:35180474, PMID:40588209, PMID:40875006]. The N-terminal α-helix is the key structural determinant distinguishing VDAC3 from VDAC1, suppressing β-barrel aggregation and governing isoform-specific channel properties, while cardiolipin selectively stabilizes the open conductive state by modulating N-terminal helix dynamics [PMID:20434446, PMID:30674561, PMID:41575209]. Beyond mitochondria, VDAC3 localizes to the mother centriole where it recruits Mps1 kinase to regulate centriole assembly and suppress primary ciliogenesis in cycling cells, and its protein levels are controlled by multiple E3 ubiquitin ligases (FBXW7, SPOP, Trim15) linking it to ferroptosis, autophagy, and mitophagy regulation [PMID:22935710, PMID:23388454, PMID:34869326, PMID:39549880, PMID:41617671]."},"prefetch_data":{"uniprot":{"accession":"Q9Y277","full_name":"Non-selective voltage-gated ion channel VDAC3","aliases":["Outer mitochondrial membrane protein porin 3"],"length_aa":283,"mass_kda":30.7,"function":"Non-selective voltage-gated ion channel that mediates the transport of anions and cations through the mitochondrion outer membrane and plasma membrane (PubMed:31935282). Forms a high-conducting channel with a stable open state and a voltage-induced closure with a mild preference for anions over cations (PubMed:31935282). Involved in male fertility and sperm mitochondrial sheath formation (By similarity)","subcellular_location":"Mitochondrion outer membrane; Membrane","url":"https://www.uniprot.org/uniprotkb/Q9Y277/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/VDAC3","classification":"Not Classified","n_dependent_lines":10,"n_total_lines":1208,"dependency_fraction":0.008278145695364239},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000078668","cell_line_id":"CID000088","localizations":[{"compartment":"mitochondria","grade":3}],"interactors":[{"gene":"VDAC1","stoichiometry":10.0},{"gene":"VDAC2","stoichiometry":10.0},{"gene":"FKBP8","stoichiometry":0.2},{"gene":"LSM14A","stoichiometry":0.2},{"gene":"MAPRE1","stoichiometry":0.2},{"gene":"PRKACA","stoichiometry":0.2},{"gene":"RAB1A","stoichiometry":0.2},{"gene":"RAB2A","stoichiometry":0.2},{"gene":"RER1","stoichiometry":0.2},{"gene":"TOMM20A","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000088","total_profiled":1310},"omim":[{"mim_id":"620764","title":"MITOCHONDRIAL SHEATH FORMATION-ASSOCIATED; 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sperm outer dense fibers (ODF), a cytoskeletal component of the flagellum, localizing outside of mitochondria and suggesting a non-channel structural role in sperm.\",\n      \"method\": \"Peptide sequencing of purified ODF proteins, isoform-specific antibodies, immunoblot, immunofluorescence microscopy, and transmission electron immunomicroscopy\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal antibody validation, multiple orthogonal localization methods, replicated across techniques\",\n      \"pmids\": [\"14739283\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"VDAC3 exists as two isoforms generated by tissue-specific alternative splicing of a 3-base exon encoding Met39; both isoforms localize to mitochondria in transfected mammalian cells, and the Met39 residue modulates VDAC3 channel function as shown by complementation of YVDAC-deficient yeast.\",\n      \"method\": \"cDNA cloning, transfection with fluorescent/epitope-tagged constructs, yeast complementation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct subcellular localization plus functional complementation with mutagenesis variant\",\n      \"pmids\": [\"9804816\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"VDAC3 has limited ability to complement porin-less yeast for mitochondrial respiration and has no influence on ROS control, unlike VDAC1 and VDAC2; over-expression of VDAC3 causes dramatic sensitivity to oxidative stress and shorter lifespan under respiratory conditions.\",\n      \"method\": \"Yeast complementation assay, real-time PCR, yeast survival/aging assays\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — functional genetic complementation with multiple phenotypic readouts across isoforms\",\n      \"pmids\": [\"20138821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Swapping the VDAC3 N-terminal 20 amino acids with those from VDAC1 fully restores mitochondrial respiration complementation activity and ROS modulation in porin-less yeast, and extends yeast lifespan, establishing the N-terminus as the key functional determinant distinguishing VDAC3 from VDAC1.\",\n      \"method\": \"N-terminal domain swap chimeras, yeast complementation assay, ROS measurement, lifespan assay\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — domain-swap mutagenesis with multiple orthogonal functional readouts\",\n      \"pmids\": [\"20434446\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In VDAC3-deficient mice, cardiac mitochondria show decreased apparent affinity for ADP and a specific defect in respiratory complex IV activity, whereas gastrocnemius muscle mitochondria ADP affinity is unaffected; structural aberrations of mitochondria correlate with these functional changes, demonstrating muscle-type specificity of VDAC3 function in vivo.\",\n      \"method\": \"VDAC3 knockout mice, in situ mitochondrial respiration, respiratory enzyme activity assays, electron microscopy\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — knockout model with defined biochemical phenotypes and structural correlation\",\n      \"pmids\": [\"20875390\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"VDAC3 is present at the mother centriole and recruits the Mps1 kinase to centrosomes by directly binding the centrosome localization domain of Mps1, thereby modulating centriole assembly.\",\n      \"method\": \"Co-immunoprecipitation, confocal imaging, centrosome localization domain mapping, RNAi knockdown with centriole assembly phenotype\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal binding assay, direct localization, and functional rescue experiment\",\n      \"pmids\": [\"22935710\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"VDAC3 depletion causes inappropriate ciliogenesis in cycling cells, and VDAC3 overexpression suppresses ciliogenesis in quiescent cells; the VDAC3-Mps1 module at the centrosome promotes ciliary disassembly during cell cycle entry, placing VDAC3 as a negative regulator of primary cilia assembly.\",\n      \"method\": \"RNAi knockdown, GFP-VDAC3 overexpression, immunofluorescence-based cilia quantification, epistasis with Mps1 targeting\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function and gain-of-function with defined cellular phenotype and epistasis\",\n      \"pmids\": [\"23388454\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"VDAC3 gating activity is activated by reducing agents (DTT) and S-nitrosoglutathione (GSNO), and by cysteine-to-alanine mutations, indicating that an intramolecular disulfide bond between the N-terminal region and the bottom of the pore suppresses VDAC3 channel gating under oxidizing conditions.\",\n      \"method\": \"Recombinant protein reconstitution into planar lipid bilayers, redox agent treatment, site-directed cysteine mutagenesis, single-channel electrophysiology\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted in vitro electrophysiology combined with mutagenesis\",\n      \"pmids\": [\"26407725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"VDAC3 cysteines (particularly Cys2/Cys8, which can form a disulfide bridge) and Cys122 are in different oxidation states in native mitochondria and regulate pore stability and conductance; the protein acts as a redox sensor reporting oxidative conditions in the mitochondrial intermembrane space.\",\n      \"method\": \"Mass spectrometry of native and recombinant VDAC3, site-directed mutagenesis of individual cysteines, SDS-PAGE mobility shift, electrophysiology, yeast complementation, circular dichroism\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal methods (MS, mutagenesis, electrophysiology, complementation) in a single study\",\n      \"pmids\": [\"26760765\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"High-resolution mass spectrometry of rat liver mitochondrial VDAC3 reveals that cysteines 36, 65, 165, and 229 are oxidized to sulfonic acid, while methionines are oxidized to methionine sulfoxide, consistent with VDAC3 being exposed to a strongly oxidizing intermembrane space environment.\",\n      \"method\": \"SDS-PAGE, tryptic/chymotryptic digestion, UHPLC/High Resolution ESI-MS/MS\",\n      \"journal\": \"Biochimica et biophysica acta. Biomembranes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct chemical characterization of PTMs on native protein\",\n      \"pmids\": [\"27989743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"VDAC3 localizes to mitochondria in HeLa cells and interacts with cytoskeletal proteins (tubulins), stress sensors, chaperones, proteasome components, and redox enzymes including protein disulfide isomerase, suggesting VDAC3 acts as an organizer of protein complexes involved in ROS homeostasis and protein quality control.\",\n      \"method\": \"Stable cell line with dual-tagged VDAC3, tandem-affinity purification, 2D gel electrophoresis, mass spectrometry, live-cell imaging, immunoprecipitation validation\",\n      \"journal\": \"Molecular bioSystems\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — systematic interactome with MS followed by immunoprecipitation validation\",\n      \"pmids\": [\"24865465\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"VDAC3 forms stable, highly conductive, weakly anion-selective voltage-gated channels similar to VDAC1, but interacts with cytosolic proteins α-synuclein and tubulin with 10–100-fold reduced on-rates; cysteine scanning mutagenesis shows VDAC3's cysteine residues regulate interaction with α-synuclein, demonstrating isoform-specific cytosolic protein regulation.\",\n      \"method\": \"Recombinant protein reconstitution in planar lipid bilayers, single-channel electrophysiology, cysteine-scanning mutagenesis\",\n      \"journal\": \"The Journal of general physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with mutagenesis and quantitative binding kinetics\",\n      \"pmids\": [\"31935282\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"VDAC3 depletion significantly exacerbates cytotoxicity of redox cyclers (menadione, paraquat) and complex I inhibitors (rotenone), causing uncontrolled mitochondrial ROS accumulation; high-resolution respirometry shows that VDAC3 cysteines are indispensable for its ability to counteract ROS-induced oxidative stress.\",\n      \"method\": \"VDAC3 knockdown/knockout (HAP1-ΔVDAC3 cells), cysteine-null VDAC3 mutant complementation, high-resolution respirometry, ROS measurement\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — KO phenotype with cysteine-null rescue and respirometry\",\n      \"pmids\": [\"35180474\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"FBXW7 functions as an E3 ubiquitin ligase for VDAC3, mediating its ubiquitination and proteasomal degradation; autophagy activation (rapamycin) increases VDAC3 degradation via this pathway and sensitizes leukemia cells to erastin-induced ferroptosis.\",\n      \"method\": \"Immunoprecipitation, UbiBrowser prediction followed by experimental confirmation, lentiviral knockdown/overexpression, xenograft model\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — E3 ligase identified by co-IP with functional manipulation and in vivo validation\",\n      \"pmids\": [\"34869326\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The BDNF-AS lncRNA recruits WDR5 to enhance FBXW7 transcription; FBXW7 then ubiquitinates VDAC3 to reduce its protein level, thereby protecting gastric cancer cells from ferroptosis.\",\n      \"method\": \"ChIRP, RIP, ChIP, co-IP, in vivo xenograft model, qRT-PCR\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal biochemical methods establishing the BDNF-AS/WDR5/FBXW7/VDAC3 axis\",\n      \"pmids\": [\"35280682\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Enteroviral 2B protein directly interacts with VDAC3; VDAC3 knockdown suppresses enterovirus 71 replication and reduces virus-induced mitochondrial ROS generation, establishing VDAC3 as an essential host factor for enteroviral ROS-dependent replication.\",\n      \"method\": \"Co-immunoprecipitation-proteomic analysis, siRNA knockdown, single-round viral replication assay, mitochondrial ROS measurement\",\n      \"journal\": \"Viruses\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — proteomic identification plus functional KD with defined ROS and replication phenotype\",\n      \"pmids\": [\"36016340\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Dankastatin B covalently targets Cys65 of VDAC3 in breast cancer cells; VDAC3 knockdown confers hypersensitivity to dankastatin B-mediated antiproliferative effects, indicating VDAC3 is at least partially responsible for the drug's anticancer mechanism.\",\n      \"method\": \"Activity-based protein profiling chemoproteomic approach, covalent interaction validation, siRNA knockdown, antiproliferative assays\",\n      \"journal\": \"Chembiochem : a European journal of chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — chemoproteomic site identification confirmed with KD phenotype\",\n      \"pmids\": [\"36964942\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The β7–β9 strand region of hVDAC3 is highly aggregation prone; an α1–β7–β9 interaction (involving the N-terminal α-helix) suppresses aggregation, and perturbation of this interaction promotes aggregation through a partially unfolded intermediate.\",\n      \"method\": \"Systematic cysteine thiol-replacement mutagenesis, far-UV circular dichroism, UV scattering spectroscopy\",\n      \"journal\": \"The Journal of general physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — systematic mutagenesis with biophysical characterization mapping aggregation mechanism\",\n      \"pmids\": [\"30674561\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Specific post-translational modifications of VDAC3 in ALS-SOD1 model cells include over-oxidation, deamidation, and succination at specific residues; deamidation of Asn215 alone alters single-channel behavior in artificial membranes, demonstrating that disease-related oxidative PTMs functionally impact VDAC3.\",\n      \"method\": \"nUHPLC/High-Resolution nESI-MS/MS of enriched VDAC3 from NSC34-SOD1G93A cells, planar lipid bilayer electrophysiology of deamidated mutant\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct mass spectrometric PTM identification with functional electrophysiological validation\",\n      \"pmids\": [\"36555496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SPOP functions as an E3 ubiquitin ligase that ubiquitinates and degrades VDAC3; ALKBH5 demethylase reduces SPOP mRNA stability (via m6A in 3'UTR), decreasing SPOP-mediated VDAC3 degradation and promoting ferroptosis; IGF2BP2 stabilizes SPOP mRNA to inhibit ferroptosis, placing VDAC3 downstream of ALKBH5/IGF2BP2/SPOP axis in diabetic cardiomyopathy.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, m6A modification analysis, RIP, mRNA stability assay in cardiomyocytes\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic axis identified by multiple biochemical assays but single lab\",\n      \"pmids\": [\"39549880\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ALKBH5 m6A demethylase reduces VDAC3 mRNA stability by decreasing m6A modification, and YTHDF1 acts as the m6A reader that enhances VDAC3 mRNA stability; VDAC3 overexpression reduces etoposide-induced cellular senescence and promotes osteogenic differentiation in bone mesenchymal stromal cells.\",\n      \"method\": \"RIP assay, luciferase reporter, Me-RIP (m6A methylation analysis), Western blot, alkaline phosphatase and alizarin red S staining\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — m6A modification writer/eraser/reader identified with functional cellular readout, single lab\",\n      \"pmids\": [\"39379688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Trim15 E3 ubiquitin ligase stabilizes VDAC3 via K6-linked ubiquitination (rather than promoting degradation), suppressing autophagy/mitophagy and elevating ROS; VDAC3 knockdown enhances autophagy and reduces ROS, defining a Trim15-VDAC3-mitophagy axis in hypopharyngeal squamous cell carcinoma.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination linkage analysis, siRNA knockdown, flow cytometry for ROS/mitophagy, xenograft model\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — K6-ubiquitin linkage identified with functional phenotype, single lab\",\n      \"pmids\": [\"41617671\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Cardiolipin uniquely retains hVDAC3 in an open-like conductive state, while anionic headgroups, negative protein-bilayer mismatch, and increased membrane viscosity optimize channel stability; lipid composition selectively modulates hVDAC3 N-terminal helix dynamics without altering global β-barrel fold.\",\n      \"method\": \"Single-channel electrophysiology, all-atom molecular dynamics simulations, systematic lipid variation\",\n      \"journal\": \"Protein science : a publication of the Protein Society\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — single-channel electrophysiology combined with MD simulations providing mechanistic detail\",\n      \"pmids\": [\"41575209\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In yeast lacking endogenous VDACs and superoxide dismutases, hVDAC3 (but not hVDAC1 or hVDAC2) maintains mitochondrial membrane potential, morphology, and efficient ATP synthesis under oxidative stress; cysteine-depleted hVDAC3 loses this protective function, confirming that hVDAC3 cysteines are essential for oxidative stress protection.\",\n      \"method\": \"Heterologous expression in yeast strains lacking POR1/POR2 and SOD1/SOD2, growth assays, mitochondrial membrane potential measurement, bioenergetic profiling\",\n      \"journal\": \"Biochimica et biophysica acta. Bioenergetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution-like genetic complementation with cysteine-null mutant and multiple bioenergetic phenotypic readouts\",\n      \"pmids\": [\"40588209\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Mass spectrometry characterization of rat VDAC3 revealed three intramolecular disulfide bonds and seven intermolecular disulfide bonds between rVDAC3 and rVDAC1 or rVDAC2, demonstrating that disulfide bridges directly mediate homo- and hetero-oligomerization of VDAC isoforms.\",\n      \"method\": \"UHPLC/High Resolution ESI-MS/MS after enzymatic digestion; non-reducing conditions to preserve disulfide bonds\",\n      \"journal\": \"Analytical and bioanalytical chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct structural characterization of disulfide bonds by high-resolution MS\",\n      \"pmids\": [\"40875006\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"VDAC3 KO in HeLa cells dramatically downregulates key electron transport chain members and shifts mitochondria to glutamine-dependent metabolism, demonstrating a non-redundant role of VDAC3 (not compensated by VDAC1/VDAC2) in supporting ETC function and cancer cell metabolic adaptability.\",\n      \"method\": \"VDAC3 knockout HeLa cells, comparative proteomics, respirometry, metabolic flux analysis\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO with proteomics and respirometry, but preprint only\",\n      \"pmids\": [\"bio_10.1101_2025.02.20.639106\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2034,\n      \"finding\": \"ACSL4 interacts with both ZIP7 (ER iron efflux channel) and VDAC3 (mitochondrial iron influx channel) at ER-mitochondria contact sites; VDAC3 knockdown reverses mitochondrial iron overload under PFOS exposure, establishing VDAC3 as a mitochondrial iron influx channel regulated by ACSL4-mediated ZIP7-VDAC3 interaction.\",\n      \"method\": \"Co-immunoprecipitation of ACSL4-VDAC3 in mouse liver and L-02 cells, siRNA knockdown of VDAC3, iron measurement\",\n      \"journal\": \"The Science of the total environment\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus functional KD with defined iron transport phenotype, single lab\",\n      \"pmids\": [\"39579909\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"VDAC3 is a β-barrel pore-forming protein of the mitochondrial outer membrane whose unique set of cysteine residues (forming intra- and intermolecular disulfide bonds) renders it a redox sensor of the intermembrane space, regulating channel gating, ROS homeostasis, and VDAC oligomerization; it interacts with cytosolic regulators (α-synuclein, tubulin) with isoform-specific kinetics, is uniquely required for maintaining electron transport chain integrity and protecting mitochondria from oxidative stress in a cysteine-dependent manner, is also present at the mother centriole where it recruits Mps1 kinase to regulate centriole assembly and suppress ciliogenesis, and its protein levels are controlled post-translationally by multiple E3 ubiquitin ligases (FBXW7, SPOP, Trim15) and m6A mRNA modification (ALKBH5/YTHDF1 axis), linking it to ferroptosis, autophagy, and mitophagy regulation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"VDAC3 is a β-barrel voltage-dependent anion channel of the mitochondrial outer membrane that functions as a redox-sensitive regulator of mitochondrial integrity, ROS homeostasis, and inter-organellar signaling. Its unique complement of cysteine residues forms intra- and intermolecular disulfide bonds that gate channel conductance under oxidizing conditions, mediate homo- and hetero-oligomerization with VDAC1/VDAC2, and are indispensable for protecting mitochondria from oxidative stress and maintaining electron transport chain function [PMID:26407725, PMID:26760765, PMID:35180474, PMID:40588209, PMID:40875006]. The N-terminal α-helix is the key structural determinant distinguishing VDAC3 from VDAC1, suppressing β-barrel aggregation and governing isoform-specific channel properties, while cardiolipin selectively stabilizes the open conductive state by modulating N-terminal helix dynamics [PMID:20434446, PMID:30674561, PMID:41575209]. Beyond mitochondria, VDAC3 localizes to the mother centriole where it recruits Mps1 kinase to regulate centriole assembly and suppress primary ciliogenesis in cycling cells, and its protein levels are controlled by multiple E3 ubiquitin ligases (FBXW7, SPOP, Trim15) linking it to ferroptosis, autophagy, and mitophagy regulation [PMID:22935710, PMID:23388454, PMID:34869326, PMID:39549880, PMID:41617671].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Identification that VDAC3 exists as tissue-specific splice isoforms differing by Met39, both targeting to mitochondria and capable of complementing yeast porin function, established VDAC3 as a functional mitochondrial channel with regulated diversity.\",\n      \"evidence\": \"cDNA cloning, tagged-construct transfection, yeast complementation of YVDAC-deficient strain\",\n      \"pmids\": [\"9804816\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Human tissue-specific expression pattern of splice variants not mapped\", \"No electrophysiological characterization of channel properties at this stage\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Discovery of VDAC3 as a structural component of sperm outer dense fibers revealed an extramitochondrial role, expanding the functional repertoire beyond channel activity.\",\n      \"evidence\": \"Peptide sequencing of purified bovine sperm ODF, isoform-specific antibodies, immunoelectron microscopy\",\n      \"pmids\": [\"14739283\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural role in ODF not mechanistically defined\", \"Whether ODF-associated VDAC3 retains channel activity unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Systematic isoform comparison in yeast and knockout mice revealed that VDAC3 is functionally distinct from VDAC1/VDAC2: it poorly complements respiratory growth, sensitizes cells to oxidative stress, and its N-terminal 20 residues are the key determinant of these isoform-specific differences, while mouse knockouts showed tissue-specific defects in complex IV activity.\",\n      \"evidence\": \"Yeast complementation with domain-swap chimeras, ROS and lifespan assays; VDAC3 KO mouse respirometry, enzyme activity, electron microscopy\",\n      \"pmids\": [\"20138821\", \"20434446\", \"20875390\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of N-terminal functional specificity at atomic resolution not resolved\", \"Mechanism linking VDAC3 to complex IV activity unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Discovery that VDAC3 localizes to the mother centriole and recruits Mps1 kinase to suppress ciliogenesis established a completely unexpected non-mitochondrial function in cell cycle-coupled centriole regulation.\",\n      \"evidence\": \"Co-IP, confocal imaging, RNAi knockdown/overexpression with cilia quantification, epistasis with Mps1\",\n      \"pmids\": [\"22935710\", \"23388454\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How VDAC3 is targeted to the centriole versus mitochondria not determined\", \"Whether centriolar VDAC3 retains channel-forming ability unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Systematic interactome mapping in HeLa cells identified VDAC3 interactions with tubulins, chaperones, proteasome components, and redox enzymes including protein disulfide isomerase, suggesting a scaffold function integrating ROS homeostasis and protein quality control.\",\n      \"evidence\": \"Tandem-affinity purification of dual-tagged VDAC3, 2D gel/MS, immunoprecipitation validation\",\n      \"pmids\": [\"24865465\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct versus indirect interactions not fully resolved for all partners\", \"Functional significance of individual interactions not tested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"In vitro electrophysiology and mass spectrometry established that VDAC3 cysteines exist in multiple oxidation states in native mitochondria and form disulfide bonds that suppress channel gating, directly demonstrating VDAC3 functions as a redox sensor of the intermembrane space.\",\n      \"evidence\": \"Reconstituted planar lipid bilayer electrophysiology with redox agents and cysteine mutagenesis; UHPLC/HR-MS of native rat liver VDAC3\",\n      \"pmids\": [\"26407725\", \"26760765\", \"27989743\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo confirmation that redox-dependent gating changes affect metabolite flux not obtained\", \"Specific IMS redox couples regulating VDAC3 cysteines not identified\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Mapping of aggregation-prone regions to β7–β9 strands and the stabilizing role of the α1–β7–β9 interaction provided the first biophysical account of how the N-terminal helix maintains VDAC3 fold stability, explaining why N-terminal perturbations are so functionally consequential.\",\n      \"evidence\": \"Systematic cysteine-to-thiol mutagenesis with CD and UV scattering spectroscopy\",\n      \"pmids\": [\"30674561\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No high-resolution atomic structure of hVDAC3 determined experimentally\", \"Aggregation intermediates not characterized in a membrane environment\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Quantitative comparison showed VDAC3 forms channels similar to VDAC1 in conductance and selectivity but interacts with α-synuclein and tubulin with 10–100-fold lower on-rates, with cysteines regulating these interactions, establishing isoform-specific cytosolic protein recognition.\",\n      \"evidence\": \"Recombinant reconstitution in planar lipid bilayers, cysteine-scanning mutagenesis, single-channel kinetics\",\n      \"pmids\": [\"31935282\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological consequence of reduced α-synuclein/tubulin binding in vivo not established\", \"Whether cysteine oxidation state modulates these interactions under physiological conditions untested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identification of FBXW7 as the first E3 ubiquitin ligase targeting VDAC3 for proteasomal degradation connected VDAC3 protein levels to autophagy and ferroptosis sensitivity in leukemia cells.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, lentiviral manipulation, xenograft model\",\n      \"pmids\": [\"34869326\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific ubiquitination sites on VDAC3 not mapped\", \"Whether FBXW7-VDAC3 axis operates in non-cancer contexts unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Multiple studies converged to show that VDAC3 cysteines are indispensable for protecting mitochondria from ROS-induced damage: VDAC3 knockout exacerbated redox cycler toxicity and a cysteine-null mutant failed to rescue, while disease-associated PTMs (over-oxidation, deamidation) alter channel function, and the BDNF-AS/FBXW7 axis regulates VDAC3 levels in gastric cancer ferroptosis.\",\n      \"evidence\": \"KO/cysteine-null complementation in HAP1 cells with respirometry; HR-MS of VDAC3 from ALS-SOD1 model; BDNF-AS/WDR5/FBXW7 ChIRP/RIP/ChIP in gastric cancer\",\n      \"pmids\": [\"35180474\", \"36555496\", \"35280682\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How specific cysteine oxidation states individually contribute to ROS protection not dissected\", \"Whether VDAC3 deamidation occurs in human ALS patients not confirmed\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Recent work completed the mechanistic picture by showing VDAC3 cysteines form defined intra- and intermolecular disulfide bonds mediating VDAC oligomerization, cardiolipin selectively stabilizes the open state by modulating N-terminal dynamics, VDAC3 is uniquely required under oxidative stress for mitochondrial membrane potential and ATP synthesis, and additional E3 ligases (SPOP, Trim15) and m6A regulators control VDAC3 levels linking it to mitophagy and ferroptosis.\",\n      \"evidence\": \"HR-MS under non-reducing conditions; single-channel electrophysiology with lipid variation and MD simulations; yeast complementation lacking SODs; Co-IP/ubiquitination/m6A analysis\",\n      \"pmids\": [\"40875006\", \"41575209\", \"40588209\", \"39549880\", \"41617671\", \"39379688\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"High-resolution experimental structure of hVDAC3 still lacking\", \"In vivo significance of VDAC hetero-oligomerization via disulfide bonds untested\", \"Relative contributions of transcriptional, m6A, and ubiquitin-mediated regulation of VDAC3 in different tissues not compared\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key open questions include the atomic-resolution structure of hVDAC3, the mechanism by which VDAC3 is differentially targeted to centrioles versus mitochondria, whether cysteine-dependent redox sensing directly controls metabolite flux in vivo, and how the multiple E3 ligase and m6A regulatory inputs are integrated to set VDAC3 protein levels in different physiological and disease contexts.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No experimental high-resolution structure of hVDAC3\", \"Dual localization mechanism (mitochondria vs. centriole) unresolved\", \"In vivo metabolite flux through VDAC3 not measured\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [1, 7, 8, 11, 22]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [7, 8, 9, 12, 23]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [1, 4, 9, 10, 12]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [7, 8, 12, 23]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [4, 25]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [13, 14]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [21]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [5, 6]}\n    ],\n    \"complexes\": [\n      \"VDAC1-VDAC3 hetero-oligomer\",\n      \"VDAC2-VDAC3 hetero-oligomer\"\n    ],\n    \"partners\": [\n      \"TTK\",\n      \"FBXW7\",\n      \"SPOP\",\n      \"TRIM15\",\n      \"SNCA\",\n      \"ACSL4\",\n      \"VDAC1\",\n      \"VDAC2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}