{"gene":"KCNA3","run_date":"2026-06-10T01:55:23","timeline":{"discoveries":[{"year":2022,"finding":"Cryo-EM structures of human Kv1.3 alone, with a nanobody inhibitor, and with an antibody-toxin fusion blocker revealed two distinct inhibitory mechanisms: four nanobody copies bind the voltage-sensing domains and pore domain to induce an inactive pore conformation, while the antibody-toxin fusion docks its toxin domain at the extracellular mouth and inserts a critical lysine into the pore, stabilizing an active pore conformation while blocking ion permeation.","method":"Cryo-EM structure determination with functional validation","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structures of multiple complexes with mechanistic interpretation of pore dynamics and two distinct inhibitory mechanisms in a single rigorous study","pmids":["35788586"],"is_preprint":false},{"year":2008,"finding":"Kv1.3 is present in the inner mitochondrial membrane of lymphocytes. Bax interacts with and functionally inhibits mitochondrial Kv1.3, triggering sequential hyperpolarization, ROS formation, cytochrome c release, and depolarization. Mutation of Bax at K128, corresponding to a conserved lysine in Kv1.3-inhibiting toxins, abrogated Bax effects on both Kv1.3 and mitochondria. Cells lacking Kv1.3 or with siRNA knockdown resisted Bax-induced apoptosis, restored by retransfection with mitochondria-targeted Kv1.3.","method":"siRNA knockdown, genetic KO, reconstitution with mitochondria-targeted Kv1.3, isolated mitochondria incubation with recombinant Bax/t-Bid, site-directed mutagenesis (BaxK128E)","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (KO, siRNA, reconstitution, mutagenesis, isolated mitochondria assay) in a single rigorous study","pmids":["18818304"],"is_preprint":false},{"year":1997,"finding":"EGF receptor and insulin receptor tyrosine kinases modulate Kv1.3 current. EGF treatment suppresses Kv1.3 current and speeds C-type inactivation via tyrosine phosphorylation; mutation of tyrosine at position 479 to phenylalanine blocks the EGF-mediated current suppression. Insulin treatment also inhibits Kv1.3 current but does not affect C-type inactivation kinetics, indicating distinct mechanisms for the two receptor tyrosine kinases.","method":"Whole-cell patch clamp in HEK293 co-expression system, site-directed mutagenesis (Y479F), tyrosine kinase inhibitor (erbstatin), receptor-blocking antibody","journal":"The Journal of general physiology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro electrophysiology with mutagenesis, pharmacological controls, and two receptor systems tested in one study","pmids":["9348331"],"is_preprint":false},{"year":2006,"finding":"Kv1.3 and Kv1.5 form functional heterotetramers in macrophages. Co-expression shifts half-activation voltage and alters pharmacological sensitivity. Both proteins co-immunoprecipitate and FRET studies confirm heteroteramer formation. TNF-α activation increases Kv1.3 without changing Kv1.5, producing a hyperpolarized shift consistent with increased Kv1.3 content.","method":"Co-immunoprecipitation, FRET, co-expression in HEK293 and Xenopus oocytes, whole-cell patch clamp, pharmacological profiling","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — reciprocal co-IP, FRET, and electrophysiology across two heterologous systems, multiple orthogonal methods","pmids":["17038323"],"is_preprint":false},{"year":2006,"finding":"In activated effector memory T cells (TEM), Kv1.3 traffics to the immunological synapse during antigen presentation where it colocalizes with Kvβ2, SAP97, ZIP, p56(lck), and CD4. Kv1.3 inhibitors suppress Ca2+-signaling, cytokine production, and proliferation of TEM cells at pharmacologically relevant concentrations.","method":"Immunofluorescence/confocal microscopy, electrophysiology, Ca2+ signaling assays, cytokine/proliferation assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization to immunological synapse, co-localization with multiple partners, functional consequence (Ca2+ signaling) demonstrated, replicated across multiple patient cohorts","pmids":["17088564"],"is_preprint":false},{"year":2009,"finding":"KCNE4, but not KCNE2, functions as an inhibitory partner of Kv1.3 in leukocytes. KCNE4 decreases Kv1.3 current density, slows activation, accelerates inactivation, retains Kv1.3 in the ER, and impairs targeting to lipid raft microdomains, reducing cell surface channel number.","method":"Co-expression, whole-cell patch clamp, confocal co-localization, surface expression assays, lipid raft fractionation","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (electrophysiology, subcellular fractionation, surface expression), single lab","pmids":["19773357"],"is_preprint":false},{"year":2003,"finding":"KCNE4 beta-subunit has a drastic inhibitory effect on Kv1.3 currents expressed in both Xenopus oocytes and HEK293 cells. KCNE4 does not inhibit Kv1.2, Kv1.4, Kv1.5, or Kv4.3 homomeric channels but reduces current through Kv1.1/Kv1.2 and Kv1.2/Kv1.3 heteromeric complexes.","method":"Heterologous expression in Xenopus oocytes and HEK293 cells, whole-cell patch clamp, confocal microscopy, Western blot","journal":"Biophysical journal","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — replicated across two heterologous expression systems with pharmacological and biophysical characterization","pmids":["12944270"],"is_preprint":false},{"year":2016,"finding":"The C-terminal domain of Kv1.3 is necessary and sufficient for interaction with KCNE4. KCNE4 retains Kv1.3 intracellularly via two independent mechanisms: masking the YMVIEE C-terminal surface targeting sequence, and an ER retention motif within KCNE4 itself.","method":"Co-immunoprecipitation, chimeric/truncation constructs, surface expression assays, confocal microscopy","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with domain mapping and surface targeting assays, single lab","pmids":["27802162"],"is_preprint":false},{"year":2000,"finding":"During ER biogenesis of Kv1.3, transmembrane segments S1, S2, S4, and S5 exhibit signal anchor or membrane integration activity; S3 and S6 fail to integrate independently. The N-terminal T1 domain prevents S1 from initiating translocation, making S2 the likely initial signal sequence. Multiple topogenic determinants cooperate during Kv1.3 assembly.","method":"Protease protection assays, glycosylation site insertion, carbonate extraction, cell-free translation/translocation system","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal biochemical assays in a single reconstitution-level study defining transmembrane topology","pmids":["10651649"],"is_preprint":false},{"year":1997,"finding":"PKC activation upregulates native Kv1.3 channel activity in human T lymphocytes, shifting voltage dependence of activation and inactivation and increasing window current ~270%. PKC inhibition reduces current. PKC-dependent phosphorylation acts as a master switch that overrides PKA-mediated upregulation.","method":"Whole-cell patch clamp in primary human T lymphocytes, pharmacological PKC activators/inhibitors, pseudosubstrate peptides, calphostin C dose-response","journal":"The Journal of membrane biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — native cell electrophysiology with multiple pharmacological tools, single lab","pmids":["9070466"],"is_preprint":false},{"year":1997,"finding":"PKA activation increases native Kv1.3 conductance in human T lymphocytes by ~60% and shifts inactivation voltage, increasing window current. Phosphatase inhibition (okadaic acid) similarly increases conductance. PKC and PKA effects are not simply additive; PKC-dependent phosphorylation dominates regulation.","method":"Whole-cell patch clamp, pharmacological PKA activators/inhibitors, phosphatase inhibitors in primary human T lymphocytes","journal":"The American journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — native cell electrophysiology with multiple pharmacological tools, single lab","pmids":["9277360"],"is_preprint":false},{"year":2004,"finding":"Gene-targeted deletion of Kv1.3 in mice alters potassium current kinetics in olfactory bulb mitral cells (slow inactivation, modified voltage dependence, dampened C-type inactivation), abolishes modulation by receptor tyrosine kinase activators, and increases expression of scaffolding proteins that normally regulate the channel through protein-protein interactions. KO mice have smaller, more numerous olfactory glomeruli and dramatically lower olfactory detection thresholds.","method":"Gene-targeted KO mice, whole-cell patch clamp, behavioral olfaction tests, immunohistochemistry, Western blot","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with multiple orthogonal phenotypic readouts (electrophysiology, anatomy, behavior), well-controlled study","pmids":["14766178"],"is_preprint":false},{"year":2003,"finding":"Kv1.3-deficient mouse thymocytes lack voltage-dependent K+ current, but develop a ~50-fold increased chloride current as a compensatory mechanism. Despite loss of Kv1.3, no defects in lymphocyte numbers, thymocyte apoptosis, or T cell proliferation are observed in mice, likely due to this chloride current compensation.","method":"Genetic KO mice (Kv1.3-/-), whole-cell patch clamp, flow cytometry, proliferation assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with electrophysiology and immune phenotyping, compensatory mechanism identified","pmids":["12878608"],"is_preprint":false},{"year":2011,"finding":"KCNE2 forms functional potassium channels with KCNA3 (Kv1.3) in the choroid plexus epithelium apical membrane. Targeted Kcne2 deletion alters KCNA3 trafficking polarity, hyperpolarizes the choroid plexus membrane by ~9 mV, and increases CSF chloride concentration by 14%.","method":"Kcne2 KO mice, patch clamp, immunohistochemistry, ion-selective electrodes for CSF composition, pharmacological blockers (margatoxin)","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with electrophysiology, trafficking analysis, and physiological readout (CSF composition)","pmids":["21859894"],"is_preprint":false},{"year":2016,"finding":"Cereblon (CRBN) epigenetically represses Kcna3 (Kv1.3) transcription by directly binding conserved DNA elements adjacent to Kcna3 via a previously uncharacterized DNA-binding motif. In the absence of CRBN, Kv1.3 expression is derepressed, increasing K+ flux, Ca2+-mediated signaling, and CD4+ T cell hyperactivation.","method":"Crbn KO mice, ChIP assay, Ca2+ flux assays, cytokine production, EAE model, CD4+ T cell functional assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO, direct ChIP showing CRBN binding to Kcna3 promoter, multiple functional readouts","pmids":["27439875"],"is_preprint":false},{"year":2012,"finding":"Kv1.3 promotes cell proliferation in vascular smooth muscle cells through an ion-flux independent mechanism requiring voltage-dependent conformational change. A poreless Kv1.3 mutant retains pro-proliferative activity, but abolishing voltage-dependent gating eliminates this effect.","method":"Heterologous expression in HEK cells, poreless mutant and gating-deficient mutant channels, proliferation assays, electrophysiology","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — mutagenesis (poreless and voltage-gating-deficient mutants) with proliferation readout, single lab with multiple orthogonal approaches","pmids":["22383699"],"is_preprint":false},{"year":2015,"finding":"Kv1.3 C-terminal residues Tyr-447 and Ser-459 are required for Kv1.3-induced cell proliferation. Voltage-dependent channel gating induces MEK-ERK1/2-dependent phosphorylation of Tyr-447, providing a signaling mechanism linking channel conformational change to proliferation independently of ion conduction.","method":"Chimeric Kv1.3-Kv1.5 channels, point mutants, GFP/cherry fusion proteins, immunocytochemistry, electrophysiology, MEK inhibitors, proliferation assays in HEK293 cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — mutagenesis of defined residues with kinase pathway dissection and proliferation readout, multiple orthogonal methods","pmids":["26655221"],"is_preprint":false},{"year":2017,"finding":"PKC activation triggers ubiquitination of Kv1.3 by the E3 ubiquitin ligase Nedd4-2, leading to clathrin-mediated endocytosis and lysosomal degradation, thereby reducing surface channel expression. PSD-95 (MAGUK family) recruits Kv1.3 to lipid raft microdomains and protects it from ubiquitination and endocytosis. Adenosine stimulates PKC-mediated Kv1.3 downregulation as an immunosuppressive mechanism.","method":"Co-immunoprecipitation, ubiquitination assays, clathrin inhibitors, lysosomal pathway inhibitors, flow cytometry, confocal microscopy in leukocytes","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, ubiquitination assay, pharmacological dissection of endocytic pathway, single lab","pmids":["28186199"],"is_preprint":false},{"year":2015,"finding":"EGF receptor activation triggers ERK1/2-mediated threonine phosphorylation of Kv1.3, causing clathrin-dependent endocytosis and lysosomal degradation of the channel. PDZ and SH3 interaction motifs and tyrosine residues are not required for this mechanism; the ERK1/2-mediated threonine phosphorylation is the critical step.","method":"Endocytosis assays, clathrin inhibitors, site-directed mutants (PDZ, SH3, tyrosine residues), ERK inhibitors, confocal microscopy","journal":"Cellular and molecular life sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis with pathway inhibitors and endocytosis assays, single lab","pmids":["26542799"],"is_preprint":false},{"year":2016,"finding":"Kv1.3 is targeted to caveolar lipid raft microdomains through a highly hydrophobic caveolin-binding domain (FQRQVWLLF) in the intracellular N-terminus that interacts with caveolin-1. Mutations or associations altering this domain impair caveolin recognition and change channel surface localization.","method":"Co-immunoprecipitation, co-localization, mutagenesis of caveolin-binding domain, cholesterol depletion, lipid raft fractionation","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, mutagenesis, lipid raft fractionation, single lab","pmids":["26931497"],"is_preprint":false},{"year":2021,"finding":"Disruption of the Kv1.3–caveolin-1 interaction (via a caveolin-binding domain mutant) causes Kv1.3 to accumulate in mitochondria rather than the plasma membrane, severely affecting mitochondrial physiology and reducing cell survival, revealing a mitochondrial caveolin-Kv1.3 axis that modulates pro-apoptotic signaling.","method":"Caveolin-binding domain mutant expression, subcellular fractionation, mitochondrial physiology assays, cell survival assays in mammalian cells","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-directed mutagenesis with functional subcellular localization and apoptosis readout, single lab","pmids":["34196606"],"is_preprint":false},{"year":2022,"finding":"Kv1.3 uses the TIM23 complex for translocation to the inner mitochondrial membrane via an unconventional mechanism (no defined N-terminal presequence; transmembrane domains cooperatively mediate targeting). The cytosolic HSP70/HSP90 chaperone complex is a key regulator of the mitochondrial import process.","method":"Mitochondrial import assays, TIM23 complex interaction studies, HSP70/HSP90 inhibition, subcellular fractionation, domain-deletion constructs","journal":"Frontiers in oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical import assays with domain dissection and chaperone inhibition, single lab","pmids":["35402277"],"is_preprint":false},{"year":2012,"finding":"N-glycosylation of Kv1.3 at position N229 in the S1-S2 extracellular linker promotes cell surface expression; blocking N-glycosylation reduces surface protein levels by ~49% and surface conductance by ~46%. GlcNAc supplementation increases surface Kv1.3 half-life by decreasing internalization.","method":"N-glycosylation site mutagenesis, surface biotinylation, patch clamp, monosaccharide supplementation experiments","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — mutagenesis with surface expression and electrophysiology readouts, single lab","pmids":["22613618"],"is_preprint":false},{"year":2008,"finding":"Kv1.3 and Kv1.5 form heterotetramers in macrophages that differ in surface localization compared to Kv1.3 homotetramers; Kv1.5 association modifies Kv1.3 trafficking and reduces its caveolin-associated raft targeting. FRAP analysis shows higher lateral mobility for Kv1.3/Kv1.5 heteromers than Kv1.3 homotetramers.","method":"FRET, co-immunoprecipitation, FRAP, cholesterol depletion, caveolae co-localization, confocal microscopy in HEK cells and macrophages","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — FRET, co-IP, FRAP as orthogonal methods, single lab","pmids":["18218624"],"is_preprint":false},{"year":2020,"finding":"The kinase Fyn directly binds to and posttranslationally modifies Kv1.3, modulating its channel activity. Fyn also transcriptionally upregulates Kv1.3 in microglia in response to aggregated α-synuclein. Fyn-dependent regulation of Kv1.3 amplifies neuroinflammatory responses in Parkinson's disease models.","method":"Duolink proximity ligation assay, patch-clamp electrophysiology, Kv1.3-KO primary microglia, PAP-1 pharmacological inhibition, animal models of PD","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proximity ligation assay for direct binding, electrophysiology, genetic KO, multiple PD models, single lab","pmids":["32597830"],"is_preprint":false},{"year":1999,"finding":"In hippocampal microglia, there is a switch from Kv1.5-like current (in non-proliferating cells) to Kv1.3-like current (in proliferating cells) during culture, accompanied by redistribution of Kv1.5 protein away from and Kv1.3 protein to the cell surface. Pharmacological inhibition correlated with the Kv channel type expressed indicates that Kv1.3 current is required for microglial proliferation.","method":"Tissue printing from brain slices, whole-cell patch clamp, immunocytochemistry, K+ channel blockers, proliferation assays","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization with functional consequence (proliferation), pharmacological correlation, single lab","pmids":["10594052"],"is_preprint":false},{"year":2005,"finding":"Kv1.3 channel activity in activated microglia is required for microglial-mediated neurotoxicity toward hippocampal neurons. The neurotoxic mechanism involves peroxynitrite production: Kv1.3 blockers reduce the NADPH oxidase-dependent respiratory burst (superoxide), without affecting nitric oxide production, thereby limiting peroxynitrite formation. Kv1.3 channel activity in this pathway is distinct from p38 MAPK used by minocycline.","method":"Transwell co-culture, LPS/phorbol ester activation, Kv1.3 channel blockers, reactive oxygen species measurement, NO measurement, p38 MAPK inhibitor comparison","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological dissection with multiple readouts and pathway comparison, single lab","pmids":["16079396"],"is_preprint":false},{"year":2021,"finding":"Kv1.3 channels increase mitochondrial oxidative phosphorylation independently of redox balance, mitochondrial membrane potential, or calcium signaling. This Kv1.3-induced respiration increases ROS production, which drives proliferation. The mechanism requires an intact voltage sensor and C-terminal ERK1/2 phosphorylation site but is channel pore independent (non-conducting mechanism).","method":"High-resolution respirometry, selective Kv1.3 channel mutation (poreless, voltage sensor, ERK site), ROS measurement, ROS scavenging, proliferation assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — mutagenesis combined with respirometry and functional readouts, single lab with multiple orthogonal approaches","pmids":["33828089"],"is_preprint":false},{"year":2009,"finding":"Kv1.3 is present in the inner mitochondrial membrane of lymphocytes and also cancer cells (PC3, MCF-7). Recombinant Kv1.3 pre-incubated with Bax prevents Bax-induced mitochondrial effects, further establishing the Kv1.3-Bax interaction at the mitochondria.","method":"Mitochondrial fractionation, Western blot, recombinant protein incubation, mitochondrial functional assays","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical fractionation with functional reconstitution, extends prior findings to cancer cells, single lab","pmids":["20114030"],"is_preprint":false},{"year":2010,"finding":"Kv1.3 channels contribute to cell-autonomous apoptotic death of retinal ganglion cells after optic nerve transection. siRNA knockdown of Kv1.3 in vivo reduced expression of proapoptotic genes caspase-3, caspase-9, and Bad, distinct from the Kv1.1-depletion effect (which increased antiapoptotic Bcl-XL).","method":"In vivo optic nerve transection model, siRNA delivered via cut optic nerve, Kv1.3 blocker injection, qRT-PCR, immunohistochemistry, RGC survival counts","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo siRNA knockdown with specific apoptosis gene readouts, single lab","pmids":["19696788"],"is_preprint":false},{"year":2009,"finding":"Kv1.3 premature exit from the immunological synapse in SLE T cells correlates with sustained Ca2+ influx and T cell hyperactivation. In normal T cells, Kv1.3 remains at the IS during termination of Ca2+ influx, suggesting that Kv1.3 trafficking regulates Ca2+ signaling duration.","method":"Two-photon microscopy, immunofluorescence, Ca2+ imaging during IS formation in primary T cells from SLE patients vs. controls","journal":"Cell calcium","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct live-cell imaging of Kv1.3 trafficking at IS with Ca2+ correlation, single lab","pmids":["19959227"],"is_preprint":false},{"year":2015,"finding":"Kv1.3 is expressed in the nuclei of multiple cancer cell lines and human brain tissue. Nuclear Kv1.3 is functional (margatoxin induces nuclear membrane hyperpolarization in a Kv1.3-dependent manner). Nuclear Kv1.3 forms a complex with upstream binding factor 1 (UBF1) and its blockade induces CREB and c-Fos phosphorylation/activation. Sp1 transcription factor binds the Kv1.3 gene promoter and regulates its nuclear expression.","method":"Subcellular fractionation, Western blot, nuclear electrophysiology, siRNA knockdown, ChIP assay, co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — fractionation, nuclear patch clamp, ChIP, co-IP, multiple methods in single lab","pmids":["25829491"],"is_preprint":false},{"year":2020,"finding":"Kv1.3 channel activity in Th17 cells is required for β1-integrin/VCAM-1-triggered vesicular glutamate release that damages neurons. Blocking Kv1.3 with a specific channel blocker prevents glutamate secretion downstream of β1-integrin signaling.","method":"KV1.3 channel blocker (in vitro and intrathecal), glutamate release assays, Ca2+ imaging, SNARE protein identification, VCAM-1 stimulation assays","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological Kv1.3 blockade with specific signaling readout, pathway linked to integrin-VCAM-1 axis, single lab with in vitro and in vivo validation","pmids":["31661467"],"is_preprint":false},{"year":2003,"finding":"Kv1.1 and Kv1.3 channels mediate the delayed-rectifying K+ conductance at the apical membrane of rat choroid plexus epithelial cells. 5-HT inhibits this conductance via 5-HT2C receptors activating PKC, which inhibits Kv1.1 and Kv1.3 channels.","method":"Whole-cell patch clamp, selective channel blockers (dendrotoxin-K, margatoxin), Western blot, immunocytochemistry, 5-HT2C receptor antagonist, PKC inhibitor","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — selective blockers with electrophysiology and protein localization, pharmacological pathway dissection, single lab","pmids":["14602579"],"is_preprint":false},{"year":1999,"finding":"Kv1.3 channels block membrane potential and calcium influx in human T cells. Correolide blocks Kv1.3 channels in T cells, inhibiting anti-CD3-induced calcium elevation, IL-2 production, and T cell proliferation, demonstrating that Kv1.3 controls Ca2+-dependent T cell activation.","method":"Electrophysiology, Ca2+ flux assays, cytokine ELISA, proliferation assays, in vivo delayed-type hypersensitivity in miniswine","journal":"Cellular immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional readouts linking Kv1.3 blockade to T cell activation, in vivo confirmation, single lab","pmids":["10607427"],"is_preprint":false},{"year":2024,"finding":"Proximity labeling proteomics (TurboID fused to Kv1.3) in microglia revealed that the N-terminus of Kv1.3 is responsible for trafficking to cell surface and mitochondria (interactors include NUDC, TIMM50), while the C-terminus interacts with immune signaling proteins (STAT1, TLR2, C3) during LPS-induced inflammation. A C-terminal PDZ-binding domain mediates 70 protein interactions. Kv1.3 functionally couples to STAT1 interferon-mediated signaling (confirmed by channel blockade).","method":"TurboID proximity labeling, mass spectrometry, electrophysiology, Western blot, flow cytometry, domain-specific constructs","journal":"Molecular & cellular proteomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proximity labeling proteomics with functional validation of STAT1 coupling, single lab","pmids":["38936775"],"is_preprint":false},{"year":2018,"finding":"Kv1.3 is localized to caveolae in adipocytes via interaction with caveolin-1. Insulin-dependent phosphorylation of Kv1.3 occurs during insulin signaling. In caveolin-1-deficient adipocytes, Kv1.3 is displaced from caveolar rafts and shows impaired insulin-dependent phosphorylation, indicating caveolar targeting is required for proper insulin signaling through Kv1.3.","method":"Caveolin-1 KO adipocyte cell line, lipid raft fractionation, co-immunoprecipitation, phosphorylation assays, glucose uptake assays","journal":"Cellular and molecular life sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with biochemical fractionation and phosphorylation assay, single lab","pmids":["29947924"],"is_preprint":false},{"year":2016,"finding":"Kv1.3 channel activity contributes to both NADPH oxidase-dependent ROS production and proliferation in M1-like microglia. Both Kv1.3 and KCa3.1 blockers inhibit pro-inflammatory cytokine production and iNOS/COX2 expression in LPS/IFN-γ-activated (M1) microglia.","method":"Whole-cell patch clamp, quantitative PCR, immunohistochemistry, pharmacological blockers (PAP-1, ShK-186, TRAM-34) in mouse neonatal microglia","journal":"Glia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiology with pharmacological dissection and cytokine readout, single lab","pmids":["27696527"],"is_preprint":false},{"year":1996,"finding":"Kv1.3 subunit assembly in T lymphocytes is a random process forming tetramers. Once expressed in the plasma membrane, tetramers do not dissociate and reassemble. A truncated Kv1.3 containing only the N-terminus and first two transmembrane segments can suppress endogenous Kv1.3 current by forming non-functional heterotetramers.","method":"Kinetic analysis of C-type inactivation of heterotetrameric channels, heterologous expression in Jurkat cells, dominant-negative suppression assays","journal":"The Journal of general physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — quantitative kinetic analysis with dominant-negative constructs, single lab","pmids":["8868051"],"is_preprint":false},{"year":2008,"finding":"Kv1.3 channels are expressed in postganglionic sympathetic neurons at cell bodies, processes, and sympathetic neurovascular junctions. Margatoxin-sensitive Kv1.3 current depolarizes resting membrane potential and decreases action potential latency. Kv1.3 modulates nicotinic ACh receptor-induced norepinephrine release; muscarinic receptor activation with bethanechol suppresses Kv1.3 current.","method":"RT-PCR, immunoblot, immunohistochemistry, whole-cell patch clamp, margatoxin pharmacology, norepinephrine release assay","journal":"American journal of physiology. Regulatory, integrative and comparative physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiology with protein localization and functional neurotransmitter release assay, single lab","pmids":["18614767"],"is_preprint":false}],"current_model":"Kv1.3 (KCNA3) is a voltage-gated potassium channel that localizes to the plasma membrane (particularly lipid raft/caveolar microdomains), inner mitochondrial membrane, and nucleus; at the plasma membrane it regulates membrane potential and Ca2+ influx to control T cell, microglial, and smooth muscle cell activation and proliferation through both ion-conducting and non-conducting (voltage sensor-dependent, ERK/MEK signaling) mechanisms, while mitochondrial Kv1.3 mediates Bax-triggered apoptotic signaling via channel inhibition leading to hyperpolarization, ROS generation, and cytochrome c release; channel activity is regulated by PKC- and PKA-dependent phosphorylation, EGF/insulin receptor tyrosine kinase-dependent phosphorylation and endocytosis, Fyn kinase-dependent modification, Nedd4-2-mediated ubiquitination and lysosomal degradation, and association with accessory subunits KCNE4 (inhibitory) and Kv1.5 (heterotetrameric), while surface expression is promoted by N-glycosylation and caveolin-1 interaction and by KCNE2 regulation in choroid plexus; the channel's tetramerization follows random subunit assembly and its biogenesis involves cooperative transmembrane domain topogenesis in the ER and TIM23-mediated import into mitochondria assisted by HSP70/HSP90 chaperones."},"narrative":{"mechanistic_narrative":"KCNA3 encodes Kv1.3, a voltage-gated potassium channel that sets membrane potential and controls Ca2+-dependent activation, cytokine production, and proliferation in T lymphocytes, microglia, and other cell types [PMID:10607427, PMID:17088564]. In activated effector memory T cells the channel traffics to the immunological synapse, where its residence regulates the duration of Ca2+ influx during antigen presentation [PMID:17088564, PMID:19959227]. Beyond canonical ion conduction, Kv1.3 drives proliferation through a non-conducting, voltage-sensor-dependent mechanism: a poreless channel retains pro-proliferative activity, voltage-dependent conformational change triggers MEK-ERK1/2 phosphorylation of C-terminal Tyr-447, and this same signaling axis increases mitochondrial oxidative phosphorylation and ROS to promote cell-cycle progression [PMID:22383699, PMID:26655221, PMID:33828089]. Kv1.3 also resides in the inner mitochondrial membrane, where Bax binds and inhibits the channel—via a conserved lysine analogous to that in Kv1.3-blocking toxins—to trigger hyperpolarization, ROS, cytochrome c release, and apoptosis [PMID:18818304, PMID:20114030]. Cryo-EM of human Kv1.3 with nanobody and antibody-toxin blockers has defined two distinct pore-inhibition modes, including toxin insertion of a critical lysine into the pore [PMID:35788586]. Channel activity, surface density, and subcellular distribution are extensively regulated: PKC and PKA phosphorylation tune gating [PMID:9070466, PMID:9277360]; receptor tyrosine kinases (EGFR, insulin receptor) and ERK1/2-dependent phosphorylation drive clathrin-mediated endocytosis and lysosomal degradation, with Nedd4-2 ubiquitination and PSD-95/raft recruitment opposing this turnover [PMID:9348331, PMID:26542799, PMID:28186199]; N-glycosylation and a caveolin-1-binding N-terminal domain promote surface localization, the latter also gating mitochondrial accumulation [PMID:22613618, PMID:26931497, PMID:34196606]. The channel assembles by random tetramerization and forms heterotetramers with Kv1.5 and is inhibited by the KCNE4 accessory subunit, which masks a C-terminal surface-targeting motif to retain Kv1.3 in the ER [PMID:8868051, PMID:17038323, PMID:19773357, PMID:27802162]. Kcna3 transcription is repressed by cereblon binding to promoter-adjacent DNA elements and activated by Fyn and Sp1, linking channel abundance to T cell and microglial inflammatory output [PMID:27439875, PMID:32597830, PMID:25829491]. Genetic deletion in mice alters olfactory bulb physiology and lowers olfactory detection thresholds, while in immune cells loss is compensated by an induced chloride current [PMID:14766178, PMID:12878608].","teleology":[{"year":1996,"claim":"Established how Kv1.3 channels assemble, showing tetramer formation is a random subunit process amenable to dominant-negative suppression.","evidence":"Kinetic analysis of heterotetramer C-type inactivation and dominant-negative truncation constructs in Jurkat cells","pmids":["8868051"],"confidence":"Medium","gaps":["Does not define ER biogenesis steps","No structural basis for subunit interface"]},{"year":1997,"claim":"Resolved how PKC and PKA phosphorylation tune native Kv1.3 gating, identifying PKC as the dominant regulatory switch in T cells.","evidence":"Whole-cell patch clamp of primary human T lymphocytes with PKC/PKA activators, inhibitors, and phosphatase inhibitors","pmids":["9070466","9277360"],"confidence":"Medium","gaps":["Phosphorylation sites not mapped","Mechanistic link between phosphorylation and gating shift not defined"]},{"year":1997,"claim":"Showed receptor tyrosine kinases directly modulate Kv1.3, distinguishing EGFR (Y479-dependent current suppression, faster inactivation) from insulin receptor regulation.","evidence":"Whole-cell patch clamp in HEK293 co-expression with Y479F mutagenesis and kinase inhibitors","pmids":["9348331"],"confidence":"High","gaps":["Downstream trafficking consequences not addressed at this stage","Does not establish endogenous receptor coupling"]},{"year":1999,"claim":"Demonstrated that Kv1.3 controls Ca2+-dependent T cell activation, establishing it as a target for immunosuppression.","evidence":"Electrophysiology, Ca2+ flux, IL-2 ELISA, proliferation assays, and in vivo hypersensitivity with the blocker correolide","pmids":["10607427"],"confidence":"Medium","gaps":["Does not distinguish conducting from non-conducting roles","No molecular signaling intermediates"]},{"year":1999,"claim":"Linked a Kv1.5-to-Kv1.3 channel switch with microglial proliferation, tying Kv1.3 surface expression to a proliferative state.","evidence":"Tissue printing, patch clamp, immunocytochemistry, and channel blockers in hippocampal microglia","pmids":["10594052"],"confidence":"Medium","gaps":["Mechanism of channel switch not defined","Correlative rather than causal at molecular level"]},{"year":2000,"claim":"Defined the cooperative ER topogenesis of Kv1.3, identifying which transmembrane segments integrate independently and the T1-domain control of S1.","evidence":"Cell-free translation/translocation, protease protection, glycosylation insertion, and carbonate extraction","pmids":["10651649"],"confidence":"High","gaps":["Does not address folding into functional tetramer","No chaperone involvement defined"]},{"year":2003,"claim":"Identified KCNE4 as a selective inhibitory beta-subunit of Kv1.3 and characterized choroid plexus Kv1.1/Kv1.3 conductance and its 5-HT/PKC regulation.","evidence":"Heterologous expression with patch clamp; selective blockers and receptor/PKC pharmacology in choroid plexus epithelium","pmids":["12944270","14602579"],"confidence":"Medium","gaps":["Molecular basis of KCNE4 selectivity not defined","Physiological role of choroid plexus current unresolved"]},{"year":2003,"claim":"Showed Kv1.3 is dispensable for immune development in vivo due to a compensatory chloride current in knockout thymocytes.","evidence":"Kv1.3-/- mice with patch clamp, flow cytometry, and proliferation assays","pmids":["12878608"],"confidence":"High","gaps":["Identity of compensatory chloride conductance unknown","Does not exclude functional roles maskable by compensation"]},{"year":2004,"claim":"Revealed an unexpected neuronal role through knockout phenotyping, with Kv1.3 shaping olfactory bulb physiology and olfactory sensitivity.","evidence":"Gene-targeted KO mice with patch clamp, behavioral olfaction tests, and immunohistochemistry","pmids":["14766178"],"confidence":"High","gaps":["Mechanism linking channel to glomerular anatomy unclear","Scaffolding-protein upregulation not mechanistically dissected"]},{"year":2006,"claim":"Established Kv1.3/Kv1.5 heterotetramers as physiologically tunable channels in macrophages, with TNF-alpha biasing subunit composition.","evidence":"Co-IP, FRET, and patch clamp across HEK293 and Xenopus oocytes","pmids":["17038323"],"confidence":"High","gaps":["Stoichiometry of heterotetramers not fixed","In vivo relevance of TNF-alpha shift not tested"]},{"year":2006,"claim":"Localized Kv1.3 to the immunological synapse with defined scaffolding partners and confirmed therapeutic relevance of blockers in effector memory T cells.","evidence":"Confocal co-localization with Kvbeta2, SAP97, ZIP, p56lck, CD4; electrophysiology and functional T cell assays across patient cohorts","pmids":["17088564"],"confidence":"High","gaps":["Trafficking machinery to synapse not defined","Direct binding partners not biochemically distinguished from co-localization"]},{"year":2008,"claim":"Defined mitochondrial Kv1.3 as a direct apoptotic effector, with Bax binding and inhibiting the channel via a toxin-mimicking lysine to trigger cytochrome c release.","evidence":"siRNA, KO, mitochondria-targeted reconstitution, isolated mitochondria assays, and BaxK128E mutagenesis","pmids":["18818304"],"confidence":"High","gaps":["Structural detail of Bax-Kv1.3 contact not resolved","Relationship to plasma-membrane pool not addressed"]},{"year":2008,"claim":"Showed Kv1.5 association rewires Kv1.3 trafficking and raft targeting, and characterized Kv1.3 in sympathetic neurons regulating norepinephrine release.","evidence":"FRET/FRAP/co-IP in macrophages; patch clamp, immunohistochemistry, and NE release assays in postganglionic sympathetic neurons","pmids":["18218624","18614767"],"confidence":"Medium","gaps":["Mechanism of altered raft targeting not molecularly defined","Neuronal signaling consequences incompletely mapped"]},{"year":2009,"claim":"Mapped how KCNE4 inhibits Kv1.3 in leukocytes by ER retention and impaired raft targeting, and linked Kv1.3 synapse residence to Ca2+ signaling duration in autoimmunity.","evidence":"Co-expression patch clamp, surface/raft assays; two-photon imaging of Kv1.3 trafficking and Ca2+ in SLE versus control T cells","pmids":["19773357","19959227"],"confidence":"Medium","gaps":["Cause of premature synapse exit in SLE unknown","KCNE4 retention motif not yet localized in this study"]},{"year":2010,"claim":"Extended mitochondrial Kv1.3 apoptotic function to cancer cells and implicated the channel in cell-autonomous neuronal death after axonal injury.","evidence":"Mitochondrial fractionation and recombinant Bax incubation in PC3/MCF-7; in vivo optic nerve transection with Kv1.3 siRNA and apoptosis gene readouts","pmids":["20114030","19696788"],"confidence":"Medium","gaps":["Whether nuclear/mitochondrial pools drive RGC death not separated","Pro-apoptotic gene regulation mechanism unresolved"]},{"year":2012,"claim":"Demonstrated a pore-independent, voltage-sensor-dependent pro-proliferative function and defined N229 glycosylation as a surface-expression determinant.","evidence":"Poreless and gating-deficient mutants with proliferation assays in HEK cells; N-glycosylation mutagenesis with surface biotinylation and patch clamp","pmids":["22383699","22613618"],"confidence":"High","gaps":["Downstream effector of voltage-sensor signaling not yet identified","How glycosylation alters internalization not mechanistically defined"]},{"year":2015,"claim":"Identified the signaling output of the non-conducting mechanism, with voltage-dependent gating driving MEK-ERK1/2 phosphorylation of C-terminal Tyr-447/Ser-459, and characterized functional nuclear Kv1.3.","evidence":"Chimeric Kv1.3-Kv1.5 channels and point mutants with MEK inhibitors and proliferation assays; nuclear fractionation, nuclear patch clamp, ChIP, and co-IP (UBF1, Sp1)","pmids":["26655221","25829491"],"confidence":"Medium","gaps":["How a membrane channel signals to ERK is not structurally defined","Nuclear channel topology and transcriptional targets incompletely defined"]},{"year":2015,"claim":"Established EGFR-triggered, ERK1/2-mediated threonine phosphorylation as the critical signal driving clathrin-dependent endocytosis and lysosomal degradation of Kv1.3.","evidence":"Endocytosis assays with clathrin and ERK inhibitors and site-directed mutants (PDZ, SH3, tyrosine)","pmids":["26542799"],"confidence":"Medium","gaps":["Phospho-threonine site not pinpointed","Adaptor linking phosphorylation to clathrin machinery unknown"]},{"year":2016,"claim":"Defined transcriptional and trafficking control nodes: cereblon represses Kcna3 via direct DNA binding, caveolin-1 targets Kv1.3 to caveolar rafts, KCNE4 masks the YMVIEE surface motif, and Kv1.3 supports M1 microglial ROS/inflammation.","evidence":"Crbn KO with ChIP and T cell/EAE assays; caveolin-binding-domain mutagenesis and raft fractionation; KCNE4 domain mapping by co-IP; microglial patch clamp with pharmacology","pmids":["27439875","26931497","27802162","27696527"],"confidence":"High","gaps":["Cereblon DNA-binding motif structure not resolved","Interplay between raft targeting and degradation not integrated"]},{"year":2017,"claim":"Identified the degradation machinery, showing PKC-triggered Nedd4-2 ubiquitination drives Kv1.3 endocytosis and lysosomal turnover, with PSD-95 raft recruitment protecting the channel.","evidence":"Co-IP, ubiquitination assays, clathrin/lysosomal inhibitors, and flow cytometry in leukocytes","pmids":["28186199"],"confidence":"Medium","gaps":["Ubiquitination sites not mapped","Direct Nedd4-2 recognition motif undefined"]},{"year":2018,"claim":"Linked caveolar Kv1.3 localization to insulin signaling in adipocytes, with caveolin-1 required for insulin-dependent channel phosphorylation.","evidence":"Caveolin-1 KO adipocytes with raft fractionation, co-IP, phosphorylation, and glucose uptake assays","pmids":["29947924"],"confidence":"Medium","gaps":["Phosphorylation site and kinase not defined","Functional role of phospho-Kv1.3 in glucose handling unresolved"]},{"year":2020,"claim":"Established Fyn as a direct binding kinase regulating Kv1.3 in microglia and connected Kv1.3 to integrin-VCAM-1-driven neurotoxic glutamate release by Th17 cells.","evidence":"Proximity ligation, patch clamp, and Kv1.3-KO microglia in PD models; glutamate release and SNARE assays with Kv1.3 blockade","pmids":["32597830","31661467"],"confidence":"Medium","gaps":["Fyn modification site on Kv1.3 not identified","How channel activity couples to vesicular release machinery unclear"]},{"year":2021,"claim":"Mechanistically connected the non-conducting role to bioenergetics and revealed a caveolin-1-controlled mitochondrial-versus-plasma-membrane partitioning of Kv1.3.","evidence":"Respirometry with poreless/voltage-sensor/ERK-site mutants and ROS assays; caveolin-binding-domain mutant with subcellular fractionation and survival assays","pmids":["33828089","34196606"],"confidence":"Medium","gaps":["How a pore-independent channel boosts OXPHOS is not biochemically resolved","Quantitative balance between organelle pools not defined"]},{"year":2022,"claim":"Provided high-resolution structural mechanisms of pore inhibition and defined the unconventional TIM23/HSP70-HSP90-dependent mitochondrial import route for Kv1.3.","evidence":"Cryo-EM of Kv1.3 with nanobody and antibody-toxin blockers; mitochondrial import assays with TIM23 interaction and chaperone inhibition","pmids":["35788586","35402277"],"confidence":"High","gaps":["Structure of native open/inactivated states without inhibitors not parsed here","Targeting signal directing import versus surface delivery not fully defined"]},{"year":2024,"claim":"Mapped the domain-resolved interactome, assigning N-terminal interactions to surface/mitochondrial trafficking and a C-terminal PDZ-binding hub to immune signaling, including functional STAT1 coupling.","evidence":"TurboID proximity labeling proteomics with domain-specific constructs and functional channel-blockade validation in microglia","pmids":["38936775"],"confidence":"Medium","gaps":["Direct versus proximity-only interactions not separated","Mechanism of STAT1 coupling to channel activity undefined"]},{"year":null,"claim":"How the non-conducting voltage-sensor conformational change is physically transmitted to ERK1/2 and to mitochondrial respiration, and how surface, mitochondrial, and nuclear pools are quantitatively partitioned, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of channel-to-kinase coupling","Partitioning signals between organelle pools not defined","Direct nuclear and mitochondrial interactors not fully validated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[34,11,33,39]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[4,19,22,5]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[1,28,20,21]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[31]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[5,7,8]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[34,4,14,37]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[1,28,29]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[16,27,2]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[14,31]}],"complexes":["Kv1.3/Kv1.5 heterotetramer","Kv1.3-KCNE4 channel complex","Kv1.1/Kv1.3 choroid plexus channel"],"partners":["KCNE4","KCNB-KV1.5 (KCNA5)","BAX","CAV1","KCNE2","FYN","NEDD4L","STAT1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P22001","full_name":"Potassium voltage-gated channel subfamily A member 3","aliases":["HGK5","HLK3","HPCN3","Voltage-gated K(+) channel HuKIII","Voltage-gated potassium channel subunit Kv1.3"],"length_aa":575,"mass_kda":63.8,"function":"Mediates the voltage-dependent potassium ion permeability of excitable membranes. Assuming opened or closed conformations in response to the voltage difference across the membrane, the protein forms a potassium-selective channel through which potassium ions may pass in accordance with their electrochemical gradient Mediates the voltage-dependent potassium ion permeability of excitable membranes. Assuming opened or closed conformations in response to the voltage difference across the membrane, the protein forms a potassium-selective channel through which potassium ions may pass in accordance with their electrochemical gradient Lacks voltage-gated potassium channel activity","subcellular_location":"Cytoplasm, perinuclear region","url":"https://www.uniprot.org/uniprotkb/P22001/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/KCNA3","classification":"Not Classified","n_dependent_lines":43,"n_total_lines":1208,"dependency_fraction":0.03559602649006623},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/KCNA3","total_profiled":1310},"omim":[{"mim_id":"602420","title":"POTASSIUM CHANNEL, VOLTAGE-GATED, SHAKER-RELATED SUBFAMILY, MEMBER 10; KCNA10","url":"https://www.omim.org/entry/602420"},{"mim_id":"176263","title":"POTASSIUM CHANNEL, VOLTAGE-GATED, SHAKER-RELATED SUBFAMILY, MEMBER 3; KCNA3","url":"https://www.omim.org/entry/176263"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"intestine","ntpm":1.9},{"tissue":"lung","ntpm":2.1},{"tissue":"lymphoid tissue","ntpm":2.5}],"url":"https://www.proteinatlas.org/search/KCNA3"},"hgnc":{"alias_symbol":["Kv1.3","MK3","HLK3","HPCN3","RP11-284N8.3"],"prev_symbol":[]},"alphafold":{"accession":"P22001","domains":[{"cath_id":"3.30.710.10","chopping":"106-202","consensus_level":"high","plddt":95.1507,"start":106,"end":202},{"cath_id":"1.20.120.350","chopping":"216-263_292-381","consensus_level":"high","plddt":87.6155,"start":216,"end":381},{"cath_id":"1.10.287.70","chopping":"385-502","consensus_level":"high","plddt":90.7191,"start":385,"end":502}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P22001","model_url":"https://alphafold.ebi.ac.uk/files/AF-P22001-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P22001-F1-predicted_aligned_error_v6.png","plddt_mean":72.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=KCNA3","jax_strain_url":"https://www.jax.org/strain/search?query=KCNA3"},"sequence":{"accession":"P22001","fasta_url":"https://rest.uniprot.org/uniprotkb/P22001.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P22001/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P22001"}},"corpus_meta":[{"pmid":"2732228","id":"PMC_2732228","title":"Cytochrome 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Bax interacts with and functionally inhibits mitochondrial Kv1.3, triggering sequential hyperpolarization, ROS formation, cytochrome c release, and depolarization. Mutation of Bax at K128, corresponding to a conserved lysine in Kv1.3-inhibiting toxins, abrogated Bax effects on both Kv1.3 and mitochondria. Cells lacking Kv1.3 or with siRNA knockdown resisted Bax-induced apoptosis, restored by retransfection with mitochondria-targeted Kv1.3.\",\n      \"method\": \"siRNA knockdown, genetic KO, reconstitution with mitochondria-targeted Kv1.3, isolated mitochondria incubation with recombinant Bax/t-Bid, site-directed mutagenesis (BaxK128E)\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (KO, siRNA, reconstitution, mutagenesis, isolated mitochondria assay) in a single rigorous study\",\n      \"pmids\": [\"18818304\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"EGF receptor and insulin receptor tyrosine kinases modulate Kv1.3 current. EGF treatment suppresses Kv1.3 current and speeds C-type inactivation via tyrosine phosphorylation; mutation of tyrosine at position 479 to phenylalanine blocks the EGF-mediated current suppression. Insulin treatment also inhibits Kv1.3 current but does not affect C-type inactivation kinetics, indicating distinct mechanisms for the two receptor tyrosine kinases.\",\n      \"method\": \"Whole-cell patch clamp in HEK293 co-expression system, site-directed mutagenesis (Y479F), tyrosine kinase inhibitor (erbstatin), receptor-blocking antibody\",\n      \"journal\": \"The Journal of general physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro electrophysiology with mutagenesis, pharmacological controls, and two receptor systems tested in one study\",\n      \"pmids\": [\"9348331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Kv1.3 and Kv1.5 form functional heterotetramers in macrophages. Co-expression shifts half-activation voltage and alters pharmacological sensitivity. Both proteins co-immunoprecipitate and FRET studies confirm heteroteramer formation. TNF-α activation increases Kv1.3 without changing Kv1.5, producing a hyperpolarized shift consistent with increased Kv1.3 content.\",\n      \"method\": \"Co-immunoprecipitation, FRET, co-expression in HEK293 and Xenopus oocytes, whole-cell patch clamp, pharmacological profiling\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — reciprocal co-IP, FRET, and electrophysiology across two heterologous systems, multiple orthogonal methods\",\n      \"pmids\": [\"17038323\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"In activated effector memory T cells (TEM), Kv1.3 traffics to the immunological synapse during antigen presentation where it colocalizes with Kvβ2, SAP97, ZIP, p56(lck), and CD4. Kv1.3 inhibitors suppress Ca2+-signaling, cytokine production, and proliferation of TEM cells at pharmacologically relevant concentrations.\",\n      \"method\": \"Immunofluorescence/confocal microscopy, electrophysiology, Ca2+ signaling assays, cytokine/proliferation assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization to immunological synapse, co-localization with multiple partners, functional consequence (Ca2+ signaling) demonstrated, replicated across multiple patient cohorts\",\n      \"pmids\": [\"17088564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"KCNE4, but not KCNE2, functions as an inhibitory partner of Kv1.3 in leukocytes. KCNE4 decreases Kv1.3 current density, slows activation, accelerates inactivation, retains Kv1.3 in the ER, and impairs targeting to lipid raft microdomains, reducing cell surface channel number.\",\n      \"method\": \"Co-expression, whole-cell patch clamp, confocal co-localization, surface expression assays, lipid raft fractionation\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (electrophysiology, subcellular fractionation, surface expression), single lab\",\n      \"pmids\": [\"19773357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"KCNE4 beta-subunit has a drastic inhibitory effect on Kv1.3 currents expressed in both Xenopus oocytes and HEK293 cells. KCNE4 does not inhibit Kv1.2, Kv1.4, Kv1.5, or Kv4.3 homomeric channels but reduces current through Kv1.1/Kv1.2 and Kv1.2/Kv1.3 heteromeric complexes.\",\n      \"method\": \"Heterologous expression in Xenopus oocytes and HEK293 cells, whole-cell patch clamp, confocal microscopy, Western blot\",\n      \"journal\": \"Biophysical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — replicated across two heterologous expression systems with pharmacological and biophysical characterization\",\n      \"pmids\": [\"12944270\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The C-terminal domain of Kv1.3 is necessary and sufficient for interaction with KCNE4. KCNE4 retains Kv1.3 intracellularly via two independent mechanisms: masking the YMVIEE C-terminal surface targeting sequence, and an ER retention motif within KCNE4 itself.\",\n      \"method\": \"Co-immunoprecipitation, chimeric/truncation constructs, surface expression assays, confocal microscopy\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with domain mapping and surface targeting assays, single lab\",\n      \"pmids\": [\"27802162\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"During ER biogenesis of Kv1.3, transmembrane segments S1, S2, S4, and S5 exhibit signal anchor or membrane integration activity; S3 and S6 fail to integrate independently. The N-terminal T1 domain prevents S1 from initiating translocation, making S2 the likely initial signal sequence. Multiple topogenic determinants cooperate during Kv1.3 assembly.\",\n      \"method\": \"Protease protection assays, glycosylation site insertion, carbonate extraction, cell-free translation/translocation system\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal biochemical assays in a single reconstitution-level study defining transmembrane topology\",\n      \"pmids\": [\"10651649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"PKC activation upregulates native Kv1.3 channel activity in human T lymphocytes, shifting voltage dependence of activation and inactivation and increasing window current ~270%. PKC inhibition reduces current. PKC-dependent phosphorylation acts as a master switch that overrides PKA-mediated upregulation.\",\n      \"method\": \"Whole-cell patch clamp in primary human T lymphocytes, pharmacological PKC activators/inhibitors, pseudosubstrate peptides, calphostin C dose-response\",\n      \"journal\": \"The Journal of membrane biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — native cell electrophysiology with multiple pharmacological tools, single lab\",\n      \"pmids\": [\"9070466\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"PKA activation increases native Kv1.3 conductance in human T lymphocytes by ~60% and shifts inactivation voltage, increasing window current. Phosphatase inhibition (okadaic acid) similarly increases conductance. PKC and PKA effects are not simply additive; PKC-dependent phosphorylation dominates regulation.\",\n      \"method\": \"Whole-cell patch clamp, pharmacological PKA activators/inhibitors, phosphatase inhibitors in primary human T lymphocytes\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — native cell electrophysiology with multiple pharmacological tools, single lab\",\n      \"pmids\": [\"9277360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Gene-targeted deletion of Kv1.3 in mice alters potassium current kinetics in olfactory bulb mitral cells (slow inactivation, modified voltage dependence, dampened C-type inactivation), abolishes modulation by receptor tyrosine kinase activators, and increases expression of scaffolding proteins that normally regulate the channel through protein-protein interactions. KO mice have smaller, more numerous olfactory glomeruli and dramatically lower olfactory detection thresholds.\",\n      \"method\": \"Gene-targeted KO mice, whole-cell patch clamp, behavioral olfaction tests, immunohistochemistry, Western blot\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with multiple orthogonal phenotypic readouts (electrophysiology, anatomy, behavior), well-controlled study\",\n      \"pmids\": [\"14766178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Kv1.3-deficient mouse thymocytes lack voltage-dependent K+ current, but develop a ~50-fold increased chloride current as a compensatory mechanism. Despite loss of Kv1.3, no defects in lymphocyte numbers, thymocyte apoptosis, or T cell proliferation are observed in mice, likely due to this chloride current compensation.\",\n      \"method\": \"Genetic KO mice (Kv1.3-/-), whole-cell patch clamp, flow cytometry, proliferation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with electrophysiology and immune phenotyping, compensatory mechanism identified\",\n      \"pmids\": [\"12878608\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"KCNE2 forms functional potassium channels with KCNA3 (Kv1.3) in the choroid plexus epithelium apical membrane. Targeted Kcne2 deletion alters KCNA3 trafficking polarity, hyperpolarizes the choroid plexus membrane by ~9 mV, and increases CSF chloride concentration by 14%.\",\n      \"method\": \"Kcne2 KO mice, patch clamp, immunohistochemistry, ion-selective electrodes for CSF composition, pharmacological blockers (margatoxin)\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with electrophysiology, trafficking analysis, and physiological readout (CSF composition)\",\n      \"pmids\": [\"21859894\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Cereblon (CRBN) epigenetically represses Kcna3 (Kv1.3) transcription by directly binding conserved DNA elements adjacent to Kcna3 via a previously uncharacterized DNA-binding motif. In the absence of CRBN, Kv1.3 expression is derepressed, increasing K+ flux, Ca2+-mediated signaling, and CD4+ T cell hyperactivation.\",\n      \"method\": \"Crbn KO mice, ChIP assay, Ca2+ flux assays, cytokine production, EAE model, CD4+ T cell functional assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO, direct ChIP showing CRBN binding to Kcna3 promoter, multiple functional readouts\",\n      \"pmids\": [\"27439875\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Kv1.3 promotes cell proliferation in vascular smooth muscle cells through an ion-flux independent mechanism requiring voltage-dependent conformational change. A poreless Kv1.3 mutant retains pro-proliferative activity, but abolishing voltage-dependent gating eliminates this effect.\",\n      \"method\": \"Heterologous expression in HEK cells, poreless mutant and gating-deficient mutant channels, proliferation assays, electrophysiology\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — mutagenesis (poreless and voltage-gating-deficient mutants) with proliferation readout, single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"22383699\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Kv1.3 C-terminal residues Tyr-447 and Ser-459 are required for Kv1.3-induced cell proliferation. Voltage-dependent channel gating induces MEK-ERK1/2-dependent phosphorylation of Tyr-447, providing a signaling mechanism linking channel conformational change to proliferation independently of ion conduction.\",\n      \"method\": \"Chimeric Kv1.3-Kv1.5 channels, point mutants, GFP/cherry fusion proteins, immunocytochemistry, electrophysiology, MEK inhibitors, proliferation assays in HEK293 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — mutagenesis of defined residues with kinase pathway dissection and proliferation readout, multiple orthogonal methods\",\n      \"pmids\": [\"26655221\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PKC activation triggers ubiquitination of Kv1.3 by the E3 ubiquitin ligase Nedd4-2, leading to clathrin-mediated endocytosis and lysosomal degradation, thereby reducing surface channel expression. PSD-95 (MAGUK family) recruits Kv1.3 to lipid raft microdomains and protects it from ubiquitination and endocytosis. Adenosine stimulates PKC-mediated Kv1.3 downregulation as an immunosuppressive mechanism.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, clathrin inhibitors, lysosomal pathway inhibitors, flow cytometry, confocal microscopy in leukocytes\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, ubiquitination assay, pharmacological dissection of endocytic pathway, single lab\",\n      \"pmids\": [\"28186199\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"EGF receptor activation triggers ERK1/2-mediated threonine phosphorylation of Kv1.3, causing clathrin-dependent endocytosis and lysosomal degradation of the channel. PDZ and SH3 interaction motifs and tyrosine residues are not required for this mechanism; the ERK1/2-mediated threonine phosphorylation is the critical step.\",\n      \"method\": \"Endocytosis assays, clathrin inhibitors, site-directed mutants (PDZ, SH3, tyrosine residues), ERK inhibitors, confocal microscopy\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis with pathway inhibitors and endocytosis assays, single lab\",\n      \"pmids\": [\"26542799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Kv1.3 is targeted to caveolar lipid raft microdomains through a highly hydrophobic caveolin-binding domain (FQRQVWLLF) in the intracellular N-terminus that interacts with caveolin-1. Mutations or associations altering this domain impair caveolin recognition and change channel surface localization.\",\n      \"method\": \"Co-immunoprecipitation, co-localization, mutagenesis of caveolin-binding domain, cholesterol depletion, lipid raft fractionation\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, mutagenesis, lipid raft fractionation, single lab\",\n      \"pmids\": [\"26931497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Disruption of the Kv1.3–caveolin-1 interaction (via a caveolin-binding domain mutant) causes Kv1.3 to accumulate in mitochondria rather than the plasma membrane, severely affecting mitochondrial physiology and reducing cell survival, revealing a mitochondrial caveolin-Kv1.3 axis that modulates pro-apoptotic signaling.\",\n      \"method\": \"Caveolin-binding domain mutant expression, subcellular fractionation, mitochondrial physiology assays, cell survival assays in mammalian cells\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-directed mutagenesis with functional subcellular localization and apoptosis readout, single lab\",\n      \"pmids\": [\"34196606\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Kv1.3 uses the TIM23 complex for translocation to the inner mitochondrial membrane via an unconventional mechanism (no defined N-terminal presequence; transmembrane domains cooperatively mediate targeting). The cytosolic HSP70/HSP90 chaperone complex is a key regulator of the mitochondrial import process.\",\n      \"method\": \"Mitochondrial import assays, TIM23 complex interaction studies, HSP70/HSP90 inhibition, subcellular fractionation, domain-deletion constructs\",\n      \"journal\": \"Frontiers in oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical import assays with domain dissection and chaperone inhibition, single lab\",\n      \"pmids\": [\"35402277\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"N-glycosylation of Kv1.3 at position N229 in the S1-S2 extracellular linker promotes cell surface expression; blocking N-glycosylation reduces surface protein levels by ~49% and surface conductance by ~46%. GlcNAc supplementation increases surface Kv1.3 half-life by decreasing internalization.\",\n      \"method\": \"N-glycosylation site mutagenesis, surface biotinylation, patch clamp, monosaccharide supplementation experiments\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — mutagenesis with surface expression and electrophysiology readouts, single lab\",\n      \"pmids\": [\"22613618\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Kv1.3 and Kv1.5 form heterotetramers in macrophages that differ in surface localization compared to Kv1.3 homotetramers; Kv1.5 association modifies Kv1.3 trafficking and reduces its caveolin-associated raft targeting. FRAP analysis shows higher lateral mobility for Kv1.3/Kv1.5 heteromers than Kv1.3 homotetramers.\",\n      \"method\": \"FRET, co-immunoprecipitation, FRAP, cholesterol depletion, caveolae co-localization, confocal microscopy in HEK cells and macrophages\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FRET, co-IP, FRAP as orthogonal methods, single lab\",\n      \"pmids\": [\"18218624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The kinase Fyn directly binds to and posttranslationally modifies Kv1.3, modulating its channel activity. Fyn also transcriptionally upregulates Kv1.3 in microglia in response to aggregated α-synuclein. Fyn-dependent regulation of Kv1.3 amplifies neuroinflammatory responses in Parkinson's disease models.\",\n      \"method\": \"Duolink proximity ligation assay, patch-clamp electrophysiology, Kv1.3-KO primary microglia, PAP-1 pharmacological inhibition, animal models of PD\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proximity ligation assay for direct binding, electrophysiology, genetic KO, multiple PD models, single lab\",\n      \"pmids\": [\"32597830\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"In hippocampal microglia, there is a switch from Kv1.5-like current (in non-proliferating cells) to Kv1.3-like current (in proliferating cells) during culture, accompanied by redistribution of Kv1.5 protein away from and Kv1.3 protein to the cell surface. Pharmacological inhibition correlated with the Kv channel type expressed indicates that Kv1.3 current is required for microglial proliferation.\",\n      \"method\": \"Tissue printing from brain slices, whole-cell patch clamp, immunocytochemistry, K+ channel blockers, proliferation assays\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization with functional consequence (proliferation), pharmacological correlation, single lab\",\n      \"pmids\": [\"10594052\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Kv1.3 channel activity in activated microglia is required for microglial-mediated neurotoxicity toward hippocampal neurons. The neurotoxic mechanism involves peroxynitrite production: Kv1.3 blockers reduce the NADPH oxidase-dependent respiratory burst (superoxide), without affecting nitric oxide production, thereby limiting peroxynitrite formation. Kv1.3 channel activity in this pathway is distinct from p38 MAPK used by minocycline.\",\n      \"method\": \"Transwell co-culture, LPS/phorbol ester activation, Kv1.3 channel blockers, reactive oxygen species measurement, NO measurement, p38 MAPK inhibitor comparison\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological dissection with multiple readouts and pathway comparison, single lab\",\n      \"pmids\": [\"16079396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Kv1.3 channels increase mitochondrial oxidative phosphorylation independently of redox balance, mitochondrial membrane potential, or calcium signaling. This Kv1.3-induced respiration increases ROS production, which drives proliferation. The mechanism requires an intact voltage sensor and C-terminal ERK1/2 phosphorylation site but is channel pore independent (non-conducting mechanism).\",\n      \"method\": \"High-resolution respirometry, selective Kv1.3 channel mutation (poreless, voltage sensor, ERK site), ROS measurement, ROS scavenging, proliferation assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — mutagenesis combined with respirometry and functional readouts, single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"33828089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Kv1.3 is present in the inner mitochondrial membrane of lymphocytes and also cancer cells (PC3, MCF-7). Recombinant Kv1.3 pre-incubated with Bax prevents Bax-induced mitochondrial effects, further establishing the Kv1.3-Bax interaction at the mitochondria.\",\n      \"method\": \"Mitochondrial fractionation, Western blot, recombinant protein incubation, mitochondrial functional assays\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical fractionation with functional reconstitution, extends prior findings to cancer cells, single lab\",\n      \"pmids\": [\"20114030\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Kv1.3 channels contribute to cell-autonomous apoptotic death of retinal ganglion cells after optic nerve transection. siRNA knockdown of Kv1.3 in vivo reduced expression of proapoptotic genes caspase-3, caspase-9, and Bad, distinct from the Kv1.1-depletion effect (which increased antiapoptotic Bcl-XL).\",\n      \"method\": \"In vivo optic nerve transection model, siRNA delivered via cut optic nerve, Kv1.3 blocker injection, qRT-PCR, immunohistochemistry, RGC survival counts\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo siRNA knockdown with specific apoptosis gene readouts, single lab\",\n      \"pmids\": [\"19696788\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Kv1.3 premature exit from the immunological synapse in SLE T cells correlates with sustained Ca2+ influx and T cell hyperactivation. In normal T cells, Kv1.3 remains at the IS during termination of Ca2+ influx, suggesting that Kv1.3 trafficking regulates Ca2+ signaling duration.\",\n      \"method\": \"Two-photon microscopy, immunofluorescence, Ca2+ imaging during IS formation in primary T cells from SLE patients vs. controls\",\n      \"journal\": \"Cell calcium\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct live-cell imaging of Kv1.3 trafficking at IS with Ca2+ correlation, single lab\",\n      \"pmids\": [\"19959227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Kv1.3 is expressed in the nuclei of multiple cancer cell lines and human brain tissue. Nuclear Kv1.3 is functional (margatoxin induces nuclear membrane hyperpolarization in a Kv1.3-dependent manner). Nuclear Kv1.3 forms a complex with upstream binding factor 1 (UBF1) and its blockade induces CREB and c-Fos phosphorylation/activation. Sp1 transcription factor binds the Kv1.3 gene promoter and regulates its nuclear expression.\",\n      \"method\": \"Subcellular fractionation, Western blot, nuclear electrophysiology, siRNA knockdown, ChIP assay, co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — fractionation, nuclear patch clamp, ChIP, co-IP, multiple methods in single lab\",\n      \"pmids\": [\"25829491\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Kv1.3 channel activity in Th17 cells is required for β1-integrin/VCAM-1-triggered vesicular glutamate release that damages neurons. Blocking Kv1.3 with a specific channel blocker prevents glutamate secretion downstream of β1-integrin signaling.\",\n      \"method\": \"KV1.3 channel blocker (in vitro and intrathecal), glutamate release assays, Ca2+ imaging, SNARE protein identification, VCAM-1 stimulation assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological Kv1.3 blockade with specific signaling readout, pathway linked to integrin-VCAM-1 axis, single lab with in vitro and in vivo validation\",\n      \"pmids\": [\"31661467\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Kv1.1 and Kv1.3 channels mediate the delayed-rectifying K+ conductance at the apical membrane of rat choroid plexus epithelial cells. 5-HT inhibits this conductance via 5-HT2C receptors activating PKC, which inhibits Kv1.1 and Kv1.3 channels.\",\n      \"method\": \"Whole-cell patch clamp, selective channel blockers (dendrotoxin-K, margatoxin), Western blot, immunocytochemistry, 5-HT2C receptor antagonist, PKC inhibitor\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — selective blockers with electrophysiology and protein localization, pharmacological pathway dissection, single lab\",\n      \"pmids\": [\"14602579\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Kv1.3 channels block membrane potential and calcium influx in human T cells. Correolide blocks Kv1.3 channels in T cells, inhibiting anti-CD3-induced calcium elevation, IL-2 production, and T cell proliferation, demonstrating that Kv1.3 controls Ca2+-dependent T cell activation.\",\n      \"method\": \"Electrophysiology, Ca2+ flux assays, cytokine ELISA, proliferation assays, in vivo delayed-type hypersensitivity in miniswine\",\n      \"journal\": \"Cellular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional readouts linking Kv1.3 blockade to T cell activation, in vivo confirmation, single lab\",\n      \"pmids\": [\"10607427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Proximity labeling proteomics (TurboID fused to Kv1.3) in microglia revealed that the N-terminus of Kv1.3 is responsible for trafficking to cell surface and mitochondria (interactors include NUDC, TIMM50), while the C-terminus interacts with immune signaling proteins (STAT1, TLR2, C3) during LPS-induced inflammation. A C-terminal PDZ-binding domain mediates 70 protein interactions. Kv1.3 functionally couples to STAT1 interferon-mediated signaling (confirmed by channel blockade).\",\n      \"method\": \"TurboID proximity labeling, mass spectrometry, electrophysiology, Western blot, flow cytometry, domain-specific constructs\",\n      \"journal\": \"Molecular & cellular proteomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proximity labeling proteomics with functional validation of STAT1 coupling, single lab\",\n      \"pmids\": [\"38936775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Kv1.3 is localized to caveolae in adipocytes via interaction with caveolin-1. Insulin-dependent phosphorylation of Kv1.3 occurs during insulin signaling. In caveolin-1-deficient adipocytes, Kv1.3 is displaced from caveolar rafts and shows impaired insulin-dependent phosphorylation, indicating caveolar targeting is required for proper insulin signaling through Kv1.3.\",\n      \"method\": \"Caveolin-1 KO adipocyte cell line, lipid raft fractionation, co-immunoprecipitation, phosphorylation assays, glucose uptake assays\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with biochemical fractionation and phosphorylation assay, single lab\",\n      \"pmids\": [\"29947924\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Kv1.3 channel activity contributes to both NADPH oxidase-dependent ROS production and proliferation in M1-like microglia. Both Kv1.3 and KCa3.1 blockers inhibit pro-inflammatory cytokine production and iNOS/COX2 expression in LPS/IFN-γ-activated (M1) microglia.\",\n      \"method\": \"Whole-cell patch clamp, quantitative PCR, immunohistochemistry, pharmacological blockers (PAP-1, ShK-186, TRAM-34) in mouse neonatal microglia\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology with pharmacological dissection and cytokine readout, single lab\",\n      \"pmids\": [\"27696527\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Kv1.3 subunit assembly in T lymphocytes is a random process forming tetramers. Once expressed in the plasma membrane, tetramers do not dissociate and reassemble. A truncated Kv1.3 containing only the N-terminus and first two transmembrane segments can suppress endogenous Kv1.3 current by forming non-functional heterotetramers.\",\n      \"method\": \"Kinetic analysis of C-type inactivation of heterotetrameric channels, heterologous expression in Jurkat cells, dominant-negative suppression assays\",\n      \"journal\": \"The Journal of general physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — quantitative kinetic analysis with dominant-negative constructs, single lab\",\n      \"pmids\": [\"8868051\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Kv1.3 channels are expressed in postganglionic sympathetic neurons at cell bodies, processes, and sympathetic neurovascular junctions. Margatoxin-sensitive Kv1.3 current depolarizes resting membrane potential and decreases action potential latency. Kv1.3 modulates nicotinic ACh receptor-induced norepinephrine release; muscarinic receptor activation with bethanechol suppresses Kv1.3 current.\",\n      \"method\": \"RT-PCR, immunoblot, immunohistochemistry, whole-cell patch clamp, margatoxin pharmacology, norepinephrine release assay\",\n      \"journal\": \"American journal of physiology. Regulatory, integrative and comparative physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology with protein localization and functional neurotransmitter release assay, single lab\",\n      \"pmids\": [\"18614767\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Kv1.3 (KCNA3) is a voltage-gated potassium channel that localizes to the plasma membrane (particularly lipid raft/caveolar microdomains), inner mitochondrial membrane, and nucleus; at the plasma membrane it regulates membrane potential and Ca2+ influx to control T cell, microglial, and smooth muscle cell activation and proliferation through both ion-conducting and non-conducting (voltage sensor-dependent, ERK/MEK signaling) mechanisms, while mitochondrial Kv1.3 mediates Bax-triggered apoptotic signaling via channel inhibition leading to hyperpolarization, ROS generation, and cytochrome c release; channel activity is regulated by PKC- and PKA-dependent phosphorylation, EGF/insulin receptor tyrosine kinase-dependent phosphorylation and endocytosis, Fyn kinase-dependent modification, Nedd4-2-mediated ubiquitination and lysosomal degradation, and association with accessory subunits KCNE4 (inhibitory) and Kv1.5 (heterotetrameric), while surface expression is promoted by N-glycosylation and caveolin-1 interaction and by KCNE2 regulation in choroid plexus; the channel's tetramerization follows random subunit assembly and its biogenesis involves cooperative transmembrane domain topogenesis in the ER and TIM23-mediated import into mitochondria assisted by HSP70/HSP90 chaperones.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"KCNA3 encodes Kv1.3, a voltage-gated potassium channel that sets membrane potential and controls Ca2+-dependent activation, cytokine production, and proliferation in T lymphocytes, microglia, and other cell types [#34, #4]. In activated effector memory T cells the channel traffics to the immunological synapse, where its residence regulates the duration of Ca2+ influx during antigen presentation [#4, #30]. Beyond canonical ion conduction, Kv1.3 drives proliferation through a non-conducting, voltage-sensor-dependent mechanism: a poreless channel retains pro-proliferative activity, voltage-dependent conformational change triggers MEK-ERK1/2 phosphorylation of C-terminal Tyr-447, and this same signaling axis increases mitochondrial oxidative phosphorylation and ROS to promote cell-cycle progression [#15, #16, #27]. Kv1.3 also resides in the inner mitochondrial membrane, where Bax binds and inhibits the channel—via a conserved lysine analogous to that in Kv1.3-blocking toxins—to trigger hyperpolarization, ROS, cytochrome c release, and apoptosis [#1, #28]. Cryo-EM of human Kv1.3 with nanobody and antibody-toxin blockers has defined two distinct pore-inhibition modes, including toxin insertion of a critical lysine into the pore [#0]. Channel activity, surface density, and subcellular distribution are extensively regulated: PKC and PKA phosphorylation tune gating [#9, #10]; receptor tyrosine kinases (EGFR, insulin receptor) and ERK1/2-dependent phosphorylation drive clathrin-mediated endocytosis and lysosomal degradation, with Nedd4-2 ubiquitination and PSD-95/raft recruitment opposing this turnover [#2, #18, #17]; N-glycosylation and a caveolin-1-binding N-terminal domain promote surface localization, the latter also gating mitochondrial accumulation [#22, #19, #20]. The channel assembles by random tetramerization and forms heterotetramers with Kv1.5 and is inhibited by the KCNE4 accessory subunit, which masks a C-terminal surface-targeting motif to retain Kv1.3 in the ER [#38, #3, #5, #7]. Kcna3 transcription is repressed by cereblon binding to promoter-adjacent DNA elements and activated by Fyn and Sp1, linking channel abundance to T cell and microglial inflammatory output [#14, #24, #31]. Genetic deletion in mice alters olfactory bulb physiology and lowers olfactory detection thresholds, while in immune cells loss is compensated by an induced chloride current [#11, #12].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Established how Kv1.3 channels assemble, showing tetramer formation is a random subunit process amenable to dominant-negative suppression.\",\n      \"evidence\": \"Kinetic analysis of heterotetramer C-type inactivation and dominant-negative truncation constructs in Jurkat cells\",\n      \"pmids\": [\"8868051\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not define ER biogenesis steps\", \"No structural basis for subunit interface\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Resolved how PKC and PKA phosphorylation tune native Kv1.3 gating, identifying PKC as the dominant regulatory switch in T cells.\",\n      \"evidence\": \"Whole-cell patch clamp of primary human T lymphocytes with PKC/PKA activators, inhibitors, and phosphatase inhibitors\",\n      \"pmids\": [\"9070466\", \"9277360\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Phosphorylation sites not mapped\", \"Mechanistic link between phosphorylation and gating shift not defined\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Showed receptor tyrosine kinases directly modulate Kv1.3, distinguishing EGFR (Y479-dependent current suppression, faster inactivation) from insulin receptor regulation.\",\n      \"evidence\": \"Whole-cell patch clamp in HEK293 co-expression with Y479F mutagenesis and kinase inhibitors\",\n      \"pmids\": [\"9348331\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream trafficking consequences not addressed at this stage\", \"Does not establish endogenous receptor coupling\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Demonstrated that Kv1.3 controls Ca2+-dependent T cell activation, establishing it as a target for immunosuppression.\",\n      \"evidence\": \"Electrophysiology, Ca2+ flux, IL-2 ELISA, proliferation assays, and in vivo hypersensitivity with the blocker correolide\",\n      \"pmids\": [\"10607427\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not distinguish conducting from non-conducting roles\", \"No molecular signaling intermediates\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Linked a Kv1.5-to-Kv1.3 channel switch with microglial proliferation, tying Kv1.3 surface expression to a proliferative state.\",\n      \"evidence\": \"Tissue printing, patch clamp, immunocytochemistry, and channel blockers in hippocampal microglia\",\n      \"pmids\": [\"10594052\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of channel switch not defined\", \"Correlative rather than causal at molecular level\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Defined the cooperative ER topogenesis of Kv1.3, identifying which transmembrane segments integrate independently and the T1-domain control of S1.\",\n      \"evidence\": \"Cell-free translation/translocation, protease protection, glycosylation insertion, and carbonate extraction\",\n      \"pmids\": [\"10651649\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not address folding into functional tetramer\", \"No chaperone involvement defined\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identified KCNE4 as a selective inhibitory beta-subunit of Kv1.3 and characterized choroid plexus Kv1.1/Kv1.3 conductance and its 5-HT/PKC regulation.\",\n      \"evidence\": \"Heterologous expression with patch clamp; selective blockers and receptor/PKC pharmacology in choroid plexus epithelium\",\n      \"pmids\": [\"12944270\", \"14602579\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of KCNE4 selectivity not defined\", \"Physiological role of choroid plexus current unresolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Showed Kv1.3 is dispensable for immune development in vivo due to a compensatory chloride current in knockout thymocytes.\",\n      \"evidence\": \"Kv1.3-/- mice with patch clamp, flow cytometry, and proliferation assays\",\n      \"pmids\": [\"12878608\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of compensatory chloride conductance unknown\", \"Does not exclude functional roles maskable by compensation\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Revealed an unexpected neuronal role through knockout phenotyping, with Kv1.3 shaping olfactory bulb physiology and olfactory sensitivity.\",\n      \"evidence\": \"Gene-targeted KO mice with patch clamp, behavioral olfaction tests, and immunohistochemistry\",\n      \"pmids\": [\"14766178\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking channel to glomerular anatomy unclear\", \"Scaffolding-protein upregulation not mechanistically dissected\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Established Kv1.3/Kv1.5 heterotetramers as physiologically tunable channels in macrophages, with TNF-alpha biasing subunit composition.\",\n      \"evidence\": \"Co-IP, FRET, and patch clamp across HEK293 and Xenopus oocytes\",\n      \"pmids\": [\"17038323\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of heterotetramers not fixed\", \"In vivo relevance of TNF-alpha shift not tested\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Localized Kv1.3 to the immunological synapse with defined scaffolding partners and confirmed therapeutic relevance of blockers in effector memory T cells.\",\n      \"evidence\": \"Confocal co-localization with Kvbeta2, SAP97, ZIP, p56lck, CD4; electrophysiology and functional T cell assays across patient cohorts\",\n      \"pmids\": [\"17088564\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trafficking machinery to synapse not defined\", \"Direct binding partners not biochemically distinguished from co-localization\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined mitochondrial Kv1.3 as a direct apoptotic effector, with Bax binding and inhibiting the channel via a toxin-mimicking lysine to trigger cytochrome c release.\",\n      \"evidence\": \"siRNA, KO, mitochondria-targeted reconstitution, isolated mitochondria assays, and BaxK128E mutagenesis\",\n      \"pmids\": [\"18818304\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural detail of Bax-Kv1.3 contact not resolved\", \"Relationship to plasma-membrane pool not addressed\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed Kv1.5 association rewires Kv1.3 trafficking and raft targeting, and characterized Kv1.3 in sympathetic neurons regulating norepinephrine release.\",\n      \"evidence\": \"FRET/FRAP/co-IP in macrophages; patch clamp, immunohistochemistry, and NE release assays in postganglionic sympathetic neurons\",\n      \"pmids\": [\"18218624\", \"18614767\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of altered raft targeting not molecularly defined\", \"Neuronal signaling consequences incompletely mapped\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Mapped how KCNE4 inhibits Kv1.3 in leukocytes by ER retention and impaired raft targeting, and linked Kv1.3 synapse residence to Ca2+ signaling duration in autoimmunity.\",\n      \"evidence\": \"Co-expression patch clamp, surface/raft assays; two-photon imaging of Kv1.3 trafficking and Ca2+ in SLE versus control T cells\",\n      \"pmids\": [\"19773357\", \"19959227\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cause of premature synapse exit in SLE unknown\", \"KCNE4 retention motif not yet localized in this study\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Extended mitochondrial Kv1.3 apoptotic function to cancer cells and implicated the channel in cell-autonomous neuronal death after axonal injury.\",\n      \"evidence\": \"Mitochondrial fractionation and recombinant Bax incubation in PC3/MCF-7; in vivo optic nerve transection with Kv1.3 siRNA and apoptosis gene readouts\",\n      \"pmids\": [\"20114030\", \"19696788\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether nuclear/mitochondrial pools drive RGC death not separated\", \"Pro-apoptotic gene regulation mechanism unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrated a pore-independent, voltage-sensor-dependent pro-proliferative function and defined N229 glycosylation as a surface-expression determinant.\",\n      \"evidence\": \"Poreless and gating-deficient mutants with proliferation assays in HEK cells; N-glycosylation mutagenesis with surface biotinylation and patch clamp\",\n      \"pmids\": [\"22383699\", \"22613618\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream effector of voltage-sensor signaling not yet identified\", \"How glycosylation alters internalization not mechanistically defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified the signaling output of the non-conducting mechanism, with voltage-dependent gating driving MEK-ERK1/2 phosphorylation of C-terminal Tyr-447/Ser-459, and characterized functional nuclear Kv1.3.\",\n      \"evidence\": \"Chimeric Kv1.3-Kv1.5 channels and point mutants with MEK inhibitors and proliferation assays; nuclear fractionation, nuclear patch clamp, ChIP, and co-IP (UBF1, Sp1)\",\n      \"pmids\": [\"26655221\", \"25829491\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How a membrane channel signals to ERK is not structurally defined\", \"Nuclear channel topology and transcriptional targets incompletely defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established EGFR-triggered, ERK1/2-mediated threonine phosphorylation as the critical signal driving clathrin-dependent endocytosis and lysosomal degradation of Kv1.3.\",\n      \"evidence\": \"Endocytosis assays with clathrin and ERK inhibitors and site-directed mutants (PDZ, SH3, tyrosine)\",\n      \"pmids\": [\"26542799\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Phospho-threonine site not pinpointed\", \"Adaptor linking phosphorylation to clathrin machinery unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined transcriptional and trafficking control nodes: cereblon represses Kcna3 via direct DNA binding, caveolin-1 targets Kv1.3 to caveolar rafts, KCNE4 masks the YMVIEE surface motif, and Kv1.3 supports M1 microglial ROS/inflammation.\",\n      \"evidence\": \"Crbn KO with ChIP and T cell/EAE assays; caveolin-binding-domain mutagenesis and raft fractionation; KCNE4 domain mapping by co-IP; microglial patch clamp with pharmacology\",\n      \"pmids\": [\"27439875\", \"26931497\", \"27802162\", \"27696527\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cereblon DNA-binding motif structure not resolved\", \"Interplay between raft targeting and degradation not integrated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified the degradation machinery, showing PKC-triggered Nedd4-2 ubiquitination drives Kv1.3 endocytosis and lysosomal turnover, with PSD-95 raft recruitment protecting the channel.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, clathrin/lysosomal inhibitors, and flow cytometry in leukocytes\",\n      \"pmids\": [\"28186199\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ubiquitination sites not mapped\", \"Direct Nedd4-2 recognition motif undefined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Linked caveolar Kv1.3 localization to insulin signaling in adipocytes, with caveolin-1 required for insulin-dependent channel phosphorylation.\",\n      \"evidence\": \"Caveolin-1 KO adipocytes with raft fractionation, co-IP, phosphorylation, and glucose uptake assays\",\n      \"pmids\": [\"29947924\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Phosphorylation site and kinase not defined\", \"Functional role of phospho-Kv1.3 in glucose handling unresolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established Fyn as a direct binding kinase regulating Kv1.3 in microglia and connected Kv1.3 to integrin-VCAM-1-driven neurotoxic glutamate release by Th17 cells.\",\n      \"evidence\": \"Proximity ligation, patch clamp, and Kv1.3-KO microglia in PD models; glutamate release and SNARE assays with Kv1.3 blockade\",\n      \"pmids\": [\"32597830\", \"31661467\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Fyn modification site on Kv1.3 not identified\", \"How channel activity couples to vesicular release machinery unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Mechanistically connected the non-conducting role to bioenergetics and revealed a caveolin-1-controlled mitochondrial-versus-plasma-membrane partitioning of Kv1.3.\",\n      \"evidence\": \"Respirometry with poreless/voltage-sensor/ERK-site mutants and ROS assays; caveolin-binding-domain mutant with subcellular fractionation and survival assays\",\n      \"pmids\": [\"33828089\", \"34196606\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How a pore-independent channel boosts OXPHOS is not biochemically resolved\", \"Quantitative balance between organelle pools not defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Provided high-resolution structural mechanisms of pore inhibition and defined the unconventional TIM23/HSP70-HSP90-dependent mitochondrial import route for Kv1.3.\",\n      \"evidence\": \"Cryo-EM of Kv1.3 with nanobody and antibody-toxin blockers; mitochondrial import assays with TIM23 interaction and chaperone inhibition\",\n      \"pmids\": [\"35788586\", \"35402277\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of native open/inactivated states without inhibitors not parsed here\", \"Targeting signal directing import versus surface delivery not fully defined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Mapped the domain-resolved interactome, assigning N-terminal interactions to surface/mitochondrial trafficking and a C-terminal PDZ-binding hub to immune signaling, including functional STAT1 coupling.\",\n      \"evidence\": \"TurboID proximity labeling proteomics with domain-specific constructs and functional channel-blockade validation in microglia\",\n      \"pmids\": [\"38936775\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus proximity-only interactions not separated\", \"Mechanism of STAT1 coupling to channel activity undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the non-conducting voltage-sensor conformational change is physically transmitted to ERK1/2 and to mitochondrial respiration, and how surface, mitochondrial, and nuclear pools are quantitatively partitioned, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of channel-to-kinase coupling\", \"Partitioning signals between organelle pools not defined\", \"Direct nuclear and mitochondrial interactors not fully validated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [34, 11, 33, 39]},\n      {\"term_id\": \"GO:0005216\", \"supporting_discovery_ids\": [34, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [4, 19, 22, 5]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [1, 28, 20, 21]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [31]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [5, 7, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [34, 4, 14, 37]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [1, 28, 29]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [16, 27, 2]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [14, 31]}\n    ],\n    \"complexes\": [\n      \"Kv1.3/Kv1.5 heterotetramer\",\n      \"Kv1.3-KCNE4 channel complex\",\n      \"Kv1.1/Kv1.3 choroid plexus channel\"\n    ],\n    \"partners\": [\n      \"KCNE4\",\n      \"KCNB-Kv1.5 (KCNA5)\",\n      \"BAX\",\n      \"CAV1\",\n      \"KCNE2\",\n      \"FYN\",\n      \"NEDD4L\",\n      \"STAT1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}