{"gene":"ERC1","run_date":"2026-06-09T23:54:43","timeline":{"discoveries":[{"year":1999,"finding":"ELKS (ERC1) encodes a 948 amino acid protein with multiple coiled-coil domains that can dimerize; its 5' portion was found fused to the RET tyrosine kinase domain in a papillary thyroid carcinoma, and the ELKS dimerization domains constitutively activate RET's cytoplasmic tyrosine kinase.","method":"cDNA cloning, gene rearrangement identification, in vitro synthesis of chimeric proteins with anti-phosphotyrosine immunoblotting","journal":"Genes, chromosomes & cancer","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro synthesis with direct phosphotyrosine detection; single lab but multiple chimeric constructs confirmed constitutive activation","pmids":["10337992"],"is_preprint":false},{"year":2002,"finding":"The ELKS gene produces at least five isoforms (alpha through epsilon) by alternative splicing; all ELKS-RET chimeric fusion proteins containing the ELKS oligomerization (coiled-coil) domains are constitutively phosphorylated at tyrosine residues, whereas native RET is not.","method":"RT-PCR isoform characterization, in vitro synthesis of fusion proteins, immunoblotting with anti-phosphotyrosine antibody","journal":"Genes, chromosomes & cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro protein synthesis plus phosphotyrosine immunoblotting; single lab, multiple constructs tested","pmids":["12203787"],"is_preprint":false},{"year":2004,"finding":"CAST2 (the rat ortholog of human ELKS/ERC1) directly binds RIM1 through its C-terminal domain and forms a hetero-oligomer with CAST1; it is tightly associated with the synaptic active zone fraction in rat brain and co-localizes with Bassoon at hippocampal synapses.","method":"Subcellular fractionation, co-immunoprecipitation, immunoelectron microscopy, primary neuronal culture co-localization","journal":"Genes to cells : devoted to molecular & cellular mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP and fractionation with direct binding demonstrated; single lab, multiple orthogonal methods","pmids":["14723704"],"is_preprint":false},{"year":2004,"finding":"ELKS is an essential regulatory subunit of the IκB kinase (IKK) complex; silencing ELKS by RNAi blocks NF-κB target gene expression (IκBα, COX-2, IL-8) and prevents protection from apoptosis. ELKS functions by recruiting IκBα to the IKK complex.","method":"RNAi knockdown, NF-κB reporter assays, co-immunoprecipitation, apoptosis assays","journal":"Science (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP identifying IKK complex membership, RNAi phenotypes across multiple NF-κB target genes; published in high-impact journal with multiple orthogonal methods","pmids":["15218148"],"is_preprint":false},{"year":2005,"finding":"C. elegans ELKS-1 directly interacts with the PDZ domain of RIM (UNC-10) at the active zone. RIM truncations containing only the PDZ and C2A domains target to release sites in an ELKS-dependent manner, indicating ELKS anchors this RIM fragment. However, RIM localizes without ELKS and ELKS localizes without RIM, demonstrating redundant anchoring mechanisms.","method":"Genetic loss-of-function (C. elegans mutants), behavioral assays, in vivo expression of PDZ domain truncations, fluorescence localization","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic epistasis combined with domain-deletion localization studies; direct binding to PDZ domain established with multiple genetic controls","pmids":["15976086"],"is_preprint":false},{"year":2005,"finding":"ELKS co-localizes with docked insulin granules and syntaxin 1 clusters at the plasma membrane of pancreatic beta cells. Introduction of the Bassoon-binding region of ELKS into insulin-producing cells markedly reduced insulin granule docking and fusion, and siRNA-mediated ELKS knockdown reduced glucose-evoked insulin release.","method":"Confocal and immunoelectron microscopy, total internal reflection fluorescence (TIRF) microscopy, dominant-negative fragment overexpression, siRNA knockdown, insulin secretion assay","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (TIRF, siRNA, dominant-negative, immunoEM) all consistently demonstrate ELKS function in insulin exocytosis; single lab","pmids":["15888548"],"is_preprint":false},{"year":2006,"finding":"C. elegans SYD-2 (Liprin-α) gain-of-function mutation promotes presynaptic active zone assembly through ELKS-1; the syd-2(gf) activity requires elks-1 but not unc-10/RIM. The gain-of-function mutant SYD-2 shows increased physical association with ELKS.","method":"Genetic epistasis in C. elegans (double mutants), co-immunoprecipitation of mutant SYD-2 with ELKS","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis combined with Co-IP demonstrating increased SYD-2(gf)–ELKS association; key mechanism paper with rigorous double-mutant analysis","pmids":["17115037"],"is_preprint":false},{"year":2006,"finding":"ELKS is involved in Ca2+-dependent exocytosis from PC12 cells; overexpression of full-length ELKS increases stimulated exocytosis, an effect abolished by deletion of either the C-terminal IWA motif (required for RIM2 binding) or the central Bassoon-binding region. ELKS promotes exocytosis at least partly via the RIM2-Munc13-1 pathway.","method":"Overexpression of full-length and deletion constructs, human growth hormone secretion assay, immunocytochemistry co-localization","journal":"Genes to cells : devoted to molecular & cellular mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-deletion approach in functional exocytosis assay; single lab with multiple deletion constructs","pmids":["16716196"],"is_preprint":false},{"year":2010,"finding":"Upon genotoxic stress, ATM activates TAK1 in a manner dependent on NEMO and ELKS. XIAP and UBC13 catalyze K63-linked polyubiquitination of ELKS, which then recruits TAK1 via its ubiquitin-binding subunits TAB2/3, assembling the TAK1/TAB2/3 and NEMO/IKK complexes to activate IKK and NF-κB.","method":"Co-immunoprecipitation, ubiquitination assays, RNAi knockdown, dominant-negative constructs, NEMO mutant analysis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct ubiquitination assay with identified E3 (XIAP) and E2 (UBC13), Co-IP of assembled complexes, multiple loss-of-function controls","pmids":["20932476"],"is_preprint":false},{"year":2014,"finding":"ERC1a (an isoform of ERC1) forms a functional complex with liprin-α1 and LL5α/LL5β at the protruding edge of migrating cells. Depletion of ERC1 impairs cell migration, invasion on extracellular matrix, lamellipodial persistence, and internalization of active integrin β1 receptors needed for adhesion turnover.","method":"siRNA depletion, live cell imaging, invasion assays, integrin internalization assays, co-localization by fluorescence microscopy","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional readouts (migration, invasion, integrin internalization) with siRNA knockdown; single lab","pmids":["24982445"],"is_preprint":false},{"year":2014,"finding":"Simultaneous conditional knockout of ELKS1 and ELKS2 in hippocampal neurons reduces neurotransmitter release at inhibitory synapses by ~50% and decreases release probability, accompanied by a ~30% reduction in action potential-triggered Ca2+ influx at inhibitory nerve terminals, without affecting synapse number or ultrastructure or presynaptic Ca2+ channel levels.","method":"Conditional knockout mice, electrophysiology (patch-clamp), Ca2+ imaging, electron microscopy, immunohistochemistry","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional double-KO with electrophysiology, Ca2+ imaging, and EM; multiple orthogonal methods in a rigorous genetic study","pmids":["25209271"],"is_preprint":false},{"year":2016,"finding":"Liprin-α1 and ERC1 co-localize with active integrin β1 clusters at the cell edge and promote focal adhesion disassembly. Displacing ERC1 from the cell edge (via dominant-negative liprin-N fragment) inhibits focal adhesion disassembly and impairs protrusion; liprin-α1 and ERC1 influence the localization of peripheral Rab7-positive endosomes.","method":"siRNA depletion, dominant-negative expression, live cell imaging, co-immunoprecipitation, fluorescence co-localization","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — dominant-negative experiments combined with siRNA and live imaging; single lab with multiple methods","pmids":["27659488"],"is_preprint":false},{"year":2018,"finding":"Deletion of the CAST/ELKS protein family at the calyx of Held reduces CaV2.1 current density and channel number, and increases release probability while decreasing the readily releasable pool, with no change in active zone ultrastructure. CAST/ELKS are positive regulators of CaV2.1 channel density and regulate vesicle fusogenicity through a post-priming step.","method":"Conditional knockout mice, patch-clamp electrophysiology, electron microscopy, immunohistochemistry","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo conditional KO with electrophysiology, EM, and immunohistochemistry; multiple functional parameters measured","pmids":["29996090"],"is_preprint":false},{"year":2019,"finding":"ELKS directly interacts with the GK domain of the voltage-dependent Ca2+ channel (VDCC) β subunit. Beta cell-specific ELKS knockout mice show impaired first-phase insulin secretion, reduced L-type VDCC current density, and markedly decreased local Ca2+ signals at the ELKS-localized vascular face of the β cell plasma membrane.","method":"Beta cell-specific knockout mice, co-immunoprecipitation (ELKS with VDCC-β subunit), in situ Ca2+ imaging, patch-clamp electrophysiology","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding identified by co-IP, combined with conditional KO electrophysiology and Ca2+ imaging; multiple orthogonal methods","pmids":["30699350"],"is_preprint":false},{"year":2019,"finding":"ERC1 forms an extended flexible dimer and assembles into cytoplasmic condensates with liquid-phase behavior modulated by a predicted intrinsically disordered region. These condensates specifically host liprin-α1 and other cell motility partners; liprin-α1 influences the dynamic behavior of the condensates but is not required for their formation.","method":"Electron microscopy, single molecule analysis, fluorescence microscopy, FRAP, domain-deletion analysis","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electron microscopy for dimer structure, FRAP for liquid-like behavior, domain deletions; single lab","pmids":["31537859"],"is_preprint":false},{"year":2021,"finding":"Oligomerized liprin-α2 coiled-coil domain promotes phase separation of the ELKS N-terminal segment through multivalent interactions, and liprin-α2, by regulating interplay between ELKS and RIM/RIM-BP phase separations, controls protein distributions within the active zone.","method":"Structural analysis (crystal/biochemical characterization), phase separation assays, gain-of-function mutation analysis, co-condensation experiments","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — structural and biochemical characterization combined with phase separation assays; single lab","pmids":["33761347"],"is_preprint":false},{"year":2023,"finding":"Dengue virus NS5 protein binds and degrades ERC1 to antagonize NF-κB activation, limit proinflammatory cytokine secretion, and reduce cell migration. The degradation involves unique properties of the methyltransferase domain of NS5 not conserved among all four DENV serotypes.","method":"Proteomics (NS5-ERC1 interaction), knockdown/overexpression, NF-κB reporter assays, chimeric virus construction, cytokine measurement","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — proteomic identification of binding, functional assays (NF-κB, cytokines, migration), chimeric virus mapping; multiple orthogonal methods","pmids":["37252973"],"is_preprint":false},{"year":2023,"finding":"Crystal structure of the Rab6B–ELKS1 complex reveals that a C-terminal segment of ELKS1 forms a helical hairpin to recognize Rab6B through a unique binding mode. Liquid-liquid phase separation of ELKS1 enhances competition with other Rab6 effectors for Rab6B binding and recruits Rab6B-coated vesicles to exocytotic sites, promoting vesicle exocytosis.","method":"Crystal structure determination, biochemical binding assays, LLPS assays, vesicle capture assays, cellular exocytosis assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus reconstitution of LLPS-enhanced vesicle capture; multiple orthogonal methods in single study","pmids":["37172719"],"is_preprint":false},{"year":2023,"finding":"The ERC1 minimal region for LL5β binding was mapped to ERC1(270-370) and LL5β(381-510); these fragments undergo direct high-affinity interaction involving intrinsically disordered regions (confirmed by NMR). Expression of LL5β(381-510) displaces endogenous ERC1 from the cell edge, reduces invadopodia density, and inhibits transwell invasion.","method":"Co-immunoprecipitation, NMR spectroscopy, domain-deletion mapping, dominant-negative fragment expression, invasion assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — NMR and Co-IP for interaction mapping, combined with functional assays; single lab","pmids":["37437062"],"is_preprint":false},{"year":2023,"finding":"During presynaptic homeostatic potentiation at Drosophila active zones, the ELKS-family protein Bruchpilot compacts its nanoscale distribution; this compaction is coupled to increased numbers and decreased mobility of the CaV2.1 ortholog Cacophony (Cac), dependent on direct interaction between Cac's intracellular C-terminus and the membrane-proximal N-terminal region of Bruchpilot/ELKS.","method":"In vivo single-molecule imaging of endogenously tagged proteins, presynaptic homeostatic potentiation paradigm, genetic disruption of Cac-Bruchpilot interaction","journal":"Science advances","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo single-molecule imaging plus genetic disruption of specific interaction; single lab but innovative approach","pmids":["36800417"],"is_preprint":false},{"year":2025,"finding":"The shortest N-terminal region of ERC1 (residues 1-244, including an intrinsically disordered region) is sufficient to drive phase separation in vitro and in cells. Deletion of this region alters the biophysical properties of ERC1 condensates and impairs tumor cell motility, without abolishing condensate formation or partner interactions, demonstrating that condensate properties per se are important for ERC1 function in migration.","method":"Phase separation assays in vitro and in cells, FRAP, domain-deletion constructs, tumor cell motility assays","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — FRAP-validated phase separation with domain mapping and functional motility assays; single lab","pmids":["40646182"],"is_preprint":false},{"year":2025,"finding":"Directed insulin secretion from beta cells occurs preferentially at margins of ELKS/LL5β patches at sites devoid of microtubules; TIRF microscopy of intact islets shows secretion restricted to ~5% of ELKS/LL5β patch area, and local MT disassembly together with optimal ELKS content predicts secretion hot spots.","method":"TIRF microscopy of intact mouse islets, live imaging of single secretion events, microtubule co-localization analysis","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct live TIRF imaging with spatial co-localization of ELKS, LL5β, and MTs; single lab, single method but precise quantitative analysis","pmids":["40366873"],"is_preprint":false},{"year":2009,"finding":"ELKS is expressed in RBL-2H3 mast cells and positively regulates exocytotic release; overexpression increases and knockdown decreases exocytotic activity. ELKS translocates to the plasma membrane after antigen stimulation.","method":"Overexpression, siRNA knockdown, immunocytochemistry, live YFP-ELKS imaging, exocytosis assay","journal":"Cellular immunology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — gain- and loss-of-function with functional readout and live imaging; single lab, moderate methods","pmids":["19515363"],"is_preprint":false},{"year":2005,"finding":"HCV NS3 protein physically interacts with ELKS-δ and ELKS-α (ERC1 isoforms) in cultured human cells including HCV replicon-containing cells; NS3 enhances secretion of alkaline phosphatase, with the degree of secretion enhancement correlating with NS3-ELKS-δ binding strength.","method":"Yeast two-hybrid, co-immunoprecipitation, GST pull-down, confocal and immunoelectron microscopy, SEAP secretion assay","journal":"The Journal of general virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP and GST pull-down confirming interaction, plus functional secretion correlation; single lab","pmids":["16033967"],"is_preprint":false},{"year":2020,"finding":"In mouse forebrain, CAST is the dominant active zone scaffold and ELKS can support CAST function. Combined conditional knockout of CAST and ELKS in the forebrain causes neonatal lethality likely due to impaired sensory-to-motor neurotransmission, while single ELKS KO alone has less severe effects.","method":"Conditional knockout mice (CaMKII-Cre), histological analysis, behavioral observation, anatomical mapping of sensory circuits","journal":"Molecular brain","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic double KO with anatomical and behavioral analysis; single lab, functional phenotype established","pmids":["31996256"],"is_preprint":false}],"current_model":"ERC1/ELKS is a multi-domain scaffold protein (rich in coiled-coil and intrinsically disordered regions) that functions at presynaptic active zones and plasma membrane-associated platforms: at synapses and secretory sites, it directly binds RIM, Bassoon/Piccolo, the VDCC-β subunit, and Rab6, and it scaffolds the assembly of Ca2+ channel-dense release sites to support neurotransmitter and hormone (insulin) exocytosis; in the NF-κB pathway, ELKS is an IKK complex subunit that recruits IκBα and, upon genotoxic stress, undergoes K63-polyubiquitination by XIAP/UBC13 to recruit TAK1 for IKK activation; in migrating cells, ERC1 forms liquid-like condensates with liprin-α1 and LL5β at the cell leading edge to promote focal adhesion turnover and active integrin internalization; and several viruses (dengue NS5, HCV NS3) exploit or degrade ERC1 to modulate secretion and NF-κB responses."},"narrative":{"mechanistic_narrative":"ERC1 (ELKS/CAST) is a coiled-coil and intrinsically-disordered scaffold protein that organizes membrane-associated assembly platforms for regulated exocytosis, NF-κB signaling, and cell migration through phase-separated condensate formation [PMID:14723704, PMID:31537859, PMID:40646182]. At presynaptic active zones it directly binds the RIM PDZ domain and forms hetero-oligomers within the active zone fraction, co-localizing with Bassoon [PMID:14723704, PMID:15976086], and conditional double knockout of ELKS1/2 reduces inhibitory neurotransmitter release and action potential-triggered Ca2+ influx [PMID:25209271]. ELKS positively regulates voltage-gated Ca2+ channel density and vesicle fusogenicity at central synapses [PMID:29996090], and at pancreatic beta cells it binds the GK domain of the VDCC-β subunit to support L-type Ca2+ current and first-phase insulin secretion at the plasma-membrane vascular face [PMID:15888548, PMID:30699350]. ELKS recognizes Rab6B via a C-terminal helical hairpin, and its liquid-liquid phase separation captures Rab6-coated vesicles at exocytotic sites [PMID:37172719]. Independently of its synaptic role, ELKS is an essential regulatory subunit of the IKK complex that recruits IκBα to drive NF-κB target gene expression [PMID:15218148]; upon genotoxic stress it is K63-polyubiquitinated by XIAP/UBC13 to recruit the TAK1/TAB2-3 complex and activate IKK [PMID:20932476]. In migrating cells ERC1 forms liquid-like condensates with liprin-α1 and LL5β at the leading edge that promote focal adhesion turnover and active integrin β1 internalization, with the condensate biophysical properties themselves being required for tumor cell motility [PMID:24982445, PMID:27659488, PMID:40646182]. Dengue virus NS5 and HCV NS3 target ELKS to modulate NF-κB responses and secretion [PMID:37252973, PMID:16033967]. ELKS coupled the dimerization domains it uses for oligomerization were first identified as a constitutively activating fusion partner of the RET kinase in papillary thyroid carcinoma [PMID:10337992].","teleology":[{"year":1999,"claim":"The first characterization established ELKS as a multi-coiled-coil dimerizing protein, discovered through an oncogenic rearrangement that fused its oligomerization domains to RET to constitutively activate the kinase.","evidence":"cDNA cloning of a thyroid carcinoma rearrangement and in vitro synthesis of chimeric proteins with anti-phosphotyrosine immunoblotting","pmids":["10337992","12203787"],"confidence":"Medium","gaps":["Did not define the normal cellular function of ELKS","Multiple splice isoforms identified but their distinct functions not resolved"]},{"year":2004,"claim":"Two parallel studies revealed dual functions: ELKS as a direct RIM-binding active zone scaffold, and as an essential IKK complex subunit recruiting IκBα for NF-κB signaling, establishing the gene's bifurcated biology.","evidence":"Subcellular fractionation, reciprocal Co-IP, immunoEM in rat brain; RNAi and NF-κB reporter assays in cells","pmids":["14723704","15218148"],"confidence":"High","gaps":["Relationship between synaptic and NF-κB pools unclear","Structural basis of RIM and IκBα binding not resolved"]},{"year":2005,"claim":"In vivo genetics in C. elegans showed ELKS-1 binds the RIM PDZ domain and anchors a RIM fragment to release sites, but with redundant anchoring mechanisms, refining how ELKS contributes to active zone assembly.","evidence":"C. elegans loss-of-function mutants with domain-truncation localization and behavioral assays","pmids":["15976086"],"confidence":"High","gaps":["Identity of redundant anchoring factors not defined","Quantitative contribution to release not measured"]},{"year":2005,"claim":"ELKS was extended beyond neurons to endocrine secretion, shown to organize docked insulin granules and support glucose-evoked insulin release in beta cells.","evidence":"TIRF and immunoEM, dominant-negative fragment overexpression, siRNA, and insulin secretion assays; plus HCV NS3 interaction shown the same year","pmids":["15888548","16033967"],"confidence":"High","gaps":["Mechanism linking docking to Ca2+ channels not yet defined","Whether secretion role uses the same RIM interface unknown"]},{"year":2006,"claim":"Genetic and biochemical work linked ELKS to liprin-α (SYD-2) for active zone assembly and to the RIM2-Munc13 pathway for Ca2+-dependent exocytosis, connecting it into a broader scaffold network.","evidence":"C. elegans epistasis with Co-IP of mutant SYD-2; PC12 overexpression/deletion constructs with growth hormone secretion assay","pmids":["17115037","16716196"],"confidence":"High","gaps":["Direct liprin-ELKS binding interface not mapped","Stoichiometry of the scaffold network unknown"]},{"year":2010,"claim":"The NF-κB role was mechanized for genotoxic stress: ELKS is K63-polyubiquitinated by XIAP/UBC13 to recruit TAK1 via TAB2/3, assembling the kinase complexes needed for IKK activation.","evidence":"Ubiquitination assays with defined E3/E2, Co-IP of assembled complexes, RNAi and dominant-negative controls","pmids":["20932476"],"confidence":"High","gaps":["Ubiquitination site(s) on ELKS not mapped","Signal terminating the ubiquitin-dependent assembly unknown"]},{"year":2014,"claim":"Definitive mouse genetics quantified ELKS's synaptic role, and a new cell-migration function emerged through ERC1-liprin-α1-LL5β complexes regulating integrin turnover.","evidence":"Conditional ELKS1/2 double-KO with electrophysiology, Ca2+ imaging and EM; siRNA depletion with invasion and integrin internalization assays","pmids":["25209271","24982445"],"confidence":"High","gaps":["How ELKS sets Ca2+ influx without changing channel levels at inhibitory terminals unresolved","Link between migration and synaptic scaffold functions unclear"]},{"year":2016,"claim":"The migration function was refined: ERC1 and liprin-α1 co-localize with active integrin clusters to drive focal adhesion disassembly and influence Rab7 endosome positioning.","evidence":"siRNA, dominant-negative liprin-N expression, live imaging and Co-IP","pmids":["27659488"],"confidence":"Medium","gaps":["Direct link to endosomal trafficking machinery not established","Causal chain from adhesion disassembly to protrusion incomplete"]},{"year":2018,"claim":"Conditional KO at the calyx of Held showed CAST/ELKS positively regulate CaV2.1 channel density and control vesicle fusogenicity through a post-priming step, mechanizing the Ca2+ influx phenotype.","evidence":"Conditional KO mice with patch-clamp, EM and immunohistochemistry","pmids":["29996090"],"confidence":"High","gaps":["Molecular basis of CaV2.1 density regulation not identified","Identity of the post-priming step molecular target unknown"]},{"year":2019,"claim":"Two studies provided molecular mechanism: ELKS directly binds the VDCC-β GK domain to support beta-cell Ca2+ current and insulin secretion, and ERC1 forms flexible dimers and liquid-like condensates hosting motility partners.","evidence":"Beta-cell-specific KO with Co-IP, Ca2+ imaging, patch-clamp; EM, single-molecule analysis and FRAP for condensates","pmids":["30699350","31537859"],"confidence":"High","gaps":["How VDCC-β binding sets channel density mechanistically unclear","Functional necessity of condensates not yet tested directly"]},{"year":2021,"claim":"Phase separation was shown to govern active zone organization, with oligomerized liprin-α2 promoting ELKS N-terminal phase separation and controlling protein distributions among ELKS, RIM and RIM-BP.","evidence":"Structural/biochemical characterization with phase separation and co-condensation assays","pmids":["33761347"],"confidence":"Medium","gaps":["In vivo relevance of the reconstituted phase behavior not confirmed","Quantitative effect on release not measured"]},{"year":2023,"claim":"A structural and mechanistic synthesis defined how ELKS captures vesicles: a C-terminal helical hairpin recognizes Rab6B and LLPS enhances competition for Rab6 to recruit vesicles to exocytotic sites; complementary work mapped the LL5β binding region and showed viral and CaV interactions.","evidence":"Rab6B-ELKS1 crystal structure with LLPS and vesicle capture assays; NMR mapping of ERC1-LL5β; DENV NS5 proteomics; Drosophila single-molecule imaging","pmids":["37172719","37437062","37252973","36800417"],"confidence":"High","gaps":["Whether Rab6 capture and synaptic RIM scaffolding use overlapping ELKS surfaces unclear","How NS5 selectively degrades ELKS at the molecular level incomplete"]},{"year":2025,"claim":"Functional dissection established that condensate biophysical properties per se, driven by the ERC1 N-terminal IDR, are required for tumor cell motility, and that directed insulin secretion occurs at margins of ELKS/LL5β patches lacking microtubules.","evidence":"In vitro/in-cell phase separation with FRAP and domain deletions plus motility assays; TIRF of intact islets with microtubule co-localization","pmids":["40646182","40366873"],"confidence":"Medium","gaps":["Mechanistic link between condensate material properties and motility machinery unknown","How microtubule absence and ELKS content jointly set secretion hot spots unresolved"]},{"year":null,"claim":"It remains unknown how a single scaffold reconciles its distinct roles across active zones, endocrine secretion, NF-κB signaling and cell migration, and whether isoform identity or phase-separation state selects between these functions.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model of how ERC1 isoforms partition among its functions","Structural basis for mutually exclusive vs. coexisting partner interactions undefined","No human Mendelian disease association established in the corpus"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[2,3,9,13,17]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[5,9,13,21,22]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[14,20]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[5,17]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[2,4,10,12]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[3,8,16]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[5,7,17,22]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,8]}],"complexes":["IKK complex","presynaptic active zone cytomatrix","ERC1-liprin-α1-LL5β leading-edge complex"],"partners":["RIM1","BASSOON","LIPRIN-Α1","LL5Β","IKBKB","RAB6B","CACNB"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8IUD2","full_name":"ELKS/Rab6-interacting/CAST family member 1","aliases":["Rab6-interacting protein 2"],"length_aa":1116,"mass_kda":128.1,"function":"Regulatory subunit of the IKK complex. Probably recruits IkappaBalpha/NFKBIA to the complex. May be involved in the organization of the cytomatrix at the nerve terminals active zone (CAZ) which regulates neurotransmitter release. May be involved in vesicle trafficking at the CAZ. May be involved in Rab-6 regulated endosomes to Golgi transport","subcellular_location":"Cytoplasm, cytoskeleton, microtubule organizing center, centrosome; Cytoplasm; Membrane; Golgi apparatus membrane; Presynaptic cell membrane; Cell projection, podosome","url":"https://www.uniprot.org/uniprotkb/Q8IUD2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ERC1","classification":"Not Classified","n_dependent_lines":6,"n_total_lines":1208,"dependency_fraction":0.004966887417218543},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CAPZB","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/ERC1","total_profiled":1310},"omim":[{"mim_id":"607127","title":"ELKS/RAB6-INTERACTING/CAST FAMILY, MEMBER 1; ERC1","url":"https://www.omim.org/entry/607127"},{"mim_id":"600599","title":"KLF TRANSCRIPTION FACTOR 1; KLF1","url":"https://www.omim.org/entry/600599"},{"mim_id":"176640","title":"PRION PROTEIN; PRNP","url":"https://www.omim.org/entry/176640"},{"mim_id":"137440","title":"GERSTMANN-STRAUSSLER DISEASE; GSD","url":"https://www.omim.org/entry/137440"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Vesicles","reliability":"Additional"},{"location":"Centrosome","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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\"finding\": \"ELKS (ERC1) encodes a 948 amino acid protein with multiple coiled-coil domains that can dimerize; its 5' portion was found fused to the RET tyrosine kinase domain in a papillary thyroid carcinoma, and the ELKS dimerization domains constitutively activate RET's cytoplasmic tyrosine kinase.\",\n      \"method\": \"cDNA cloning, gene rearrangement identification, in vitro synthesis of chimeric proteins with anti-phosphotyrosine immunoblotting\",\n      \"journal\": \"Genes, chromosomes & cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro synthesis with direct phosphotyrosine detection; single lab but multiple chimeric constructs confirmed constitutive activation\",\n      \"pmids\": [\"10337992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The ELKS gene produces at least five isoforms (alpha through epsilon) by alternative splicing; all ELKS-RET chimeric fusion proteins containing the ELKS oligomerization (coiled-coil) domains are constitutively phosphorylated at tyrosine residues, whereas native RET is not.\",\n      \"method\": \"RT-PCR isoform characterization, in vitro synthesis of fusion proteins, immunoblotting with anti-phosphotyrosine antibody\",\n      \"journal\": \"Genes, chromosomes & cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro protein synthesis plus phosphotyrosine immunoblotting; single lab, multiple constructs tested\",\n      \"pmids\": [\"12203787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"CAST2 (the rat ortholog of human ELKS/ERC1) directly binds RIM1 through its C-terminal domain and forms a hetero-oligomer with CAST1; it is tightly associated with the synaptic active zone fraction in rat brain and co-localizes with Bassoon at hippocampal synapses.\",\n      \"method\": \"Subcellular fractionation, co-immunoprecipitation, immunoelectron microscopy, primary neuronal culture co-localization\",\n      \"journal\": \"Genes to cells : devoted to molecular & cellular mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP and fractionation with direct binding demonstrated; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"14723704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ELKS is an essential regulatory subunit of the IκB kinase (IKK) complex; silencing ELKS by RNAi blocks NF-κB target gene expression (IκBα, COX-2, IL-8) and prevents protection from apoptosis. ELKS functions by recruiting IκBα to the IKK complex.\",\n      \"method\": \"RNAi knockdown, NF-κB reporter assays, co-immunoprecipitation, apoptosis assays\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP identifying IKK complex membership, RNAi phenotypes across multiple NF-κB target genes; published in high-impact journal with multiple orthogonal methods\",\n      \"pmids\": [\"15218148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"C. elegans ELKS-1 directly interacts with the PDZ domain of RIM (UNC-10) at the active zone. RIM truncations containing only the PDZ and C2A domains target to release sites in an ELKS-dependent manner, indicating ELKS anchors this RIM fragment. However, RIM localizes without ELKS and ELKS localizes without RIM, demonstrating redundant anchoring mechanisms.\",\n      \"method\": \"Genetic loss-of-function (C. elegans mutants), behavioral assays, in vivo expression of PDZ domain truncations, fluorescence localization\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic epistasis combined with domain-deletion localization studies; direct binding to PDZ domain established with multiple genetic controls\",\n      \"pmids\": [\"15976086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"ELKS co-localizes with docked insulin granules and syntaxin 1 clusters at the plasma membrane of pancreatic beta cells. Introduction of the Bassoon-binding region of ELKS into insulin-producing cells markedly reduced insulin granule docking and fusion, and siRNA-mediated ELKS knockdown reduced glucose-evoked insulin release.\",\n      \"method\": \"Confocal and immunoelectron microscopy, total internal reflection fluorescence (TIRF) microscopy, dominant-negative fragment overexpression, siRNA knockdown, insulin secretion assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (TIRF, siRNA, dominant-negative, immunoEM) all consistently demonstrate ELKS function in insulin exocytosis; single lab\",\n      \"pmids\": [\"15888548\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"C. elegans SYD-2 (Liprin-α) gain-of-function mutation promotes presynaptic active zone assembly through ELKS-1; the syd-2(gf) activity requires elks-1 but not unc-10/RIM. The gain-of-function mutant SYD-2 shows increased physical association with ELKS.\",\n      \"method\": \"Genetic epistasis in C. elegans (double mutants), co-immunoprecipitation of mutant SYD-2 with ELKS\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis combined with Co-IP demonstrating increased SYD-2(gf)–ELKS association; key mechanism paper with rigorous double-mutant analysis\",\n      \"pmids\": [\"17115037\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"ELKS is involved in Ca2+-dependent exocytosis from PC12 cells; overexpression of full-length ELKS increases stimulated exocytosis, an effect abolished by deletion of either the C-terminal IWA motif (required for RIM2 binding) or the central Bassoon-binding region. ELKS promotes exocytosis at least partly via the RIM2-Munc13-1 pathway.\",\n      \"method\": \"Overexpression of full-length and deletion constructs, human growth hormone secretion assay, immunocytochemistry co-localization\",\n      \"journal\": \"Genes to cells : devoted to molecular & cellular mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-deletion approach in functional exocytosis assay; single lab with multiple deletion constructs\",\n      \"pmids\": [\"16716196\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Upon genotoxic stress, ATM activates TAK1 in a manner dependent on NEMO and ELKS. XIAP and UBC13 catalyze K63-linked polyubiquitination of ELKS, which then recruits TAK1 via its ubiquitin-binding subunits TAB2/3, assembling the TAK1/TAB2/3 and NEMO/IKK complexes to activate IKK and NF-κB.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, RNAi knockdown, dominant-negative constructs, NEMO mutant analysis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct ubiquitination assay with identified E3 (XIAP) and E2 (UBC13), Co-IP of assembled complexes, multiple loss-of-function controls\",\n      \"pmids\": [\"20932476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ERC1a (an isoform of ERC1) forms a functional complex with liprin-α1 and LL5α/LL5β at the protruding edge of migrating cells. Depletion of ERC1 impairs cell migration, invasion on extracellular matrix, lamellipodial persistence, and internalization of active integrin β1 receptors needed for adhesion turnover.\",\n      \"method\": \"siRNA depletion, live cell imaging, invasion assays, integrin internalization assays, co-localization by fluorescence microscopy\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional readouts (migration, invasion, integrin internalization) with siRNA knockdown; single lab\",\n      \"pmids\": [\"24982445\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Simultaneous conditional knockout of ELKS1 and ELKS2 in hippocampal neurons reduces neurotransmitter release at inhibitory synapses by ~50% and decreases release probability, accompanied by a ~30% reduction in action potential-triggered Ca2+ influx at inhibitory nerve terminals, without affecting synapse number or ultrastructure or presynaptic Ca2+ channel levels.\",\n      \"method\": \"Conditional knockout mice, electrophysiology (patch-clamp), Ca2+ imaging, electron microscopy, immunohistochemistry\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional double-KO with electrophysiology, Ca2+ imaging, and EM; multiple orthogonal methods in a rigorous genetic study\",\n      \"pmids\": [\"25209271\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Liprin-α1 and ERC1 co-localize with active integrin β1 clusters at the cell edge and promote focal adhesion disassembly. Displacing ERC1 from the cell edge (via dominant-negative liprin-N fragment) inhibits focal adhesion disassembly and impairs protrusion; liprin-α1 and ERC1 influence the localization of peripheral Rab7-positive endosomes.\",\n      \"method\": \"siRNA depletion, dominant-negative expression, live cell imaging, co-immunoprecipitation, fluorescence co-localization\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dominant-negative experiments combined with siRNA and live imaging; single lab with multiple methods\",\n      \"pmids\": [\"27659488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Deletion of the CAST/ELKS protein family at the calyx of Held reduces CaV2.1 current density and channel number, and increases release probability while decreasing the readily releasable pool, with no change in active zone ultrastructure. CAST/ELKS are positive regulators of CaV2.1 channel density and regulate vesicle fusogenicity through a post-priming step.\",\n      \"method\": \"Conditional knockout mice, patch-clamp electrophysiology, electron microscopy, immunohistochemistry\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo conditional KO with electrophysiology, EM, and immunohistochemistry; multiple functional parameters measured\",\n      \"pmids\": [\"29996090\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ELKS directly interacts with the GK domain of the voltage-dependent Ca2+ channel (VDCC) β subunit. Beta cell-specific ELKS knockout mice show impaired first-phase insulin secretion, reduced L-type VDCC current density, and markedly decreased local Ca2+ signals at the ELKS-localized vascular face of the β cell plasma membrane.\",\n      \"method\": \"Beta cell-specific knockout mice, co-immunoprecipitation (ELKS with VDCC-β subunit), in situ Ca2+ imaging, patch-clamp electrophysiology\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding identified by co-IP, combined with conditional KO electrophysiology and Ca2+ imaging; multiple orthogonal methods\",\n      \"pmids\": [\"30699350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ERC1 forms an extended flexible dimer and assembles into cytoplasmic condensates with liquid-phase behavior modulated by a predicted intrinsically disordered region. These condensates specifically host liprin-α1 and other cell motility partners; liprin-α1 influences the dynamic behavior of the condensates but is not required for their formation.\",\n      \"method\": \"Electron microscopy, single molecule analysis, fluorescence microscopy, FRAP, domain-deletion analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electron microscopy for dimer structure, FRAP for liquid-like behavior, domain deletions; single lab\",\n      \"pmids\": [\"31537859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Oligomerized liprin-α2 coiled-coil domain promotes phase separation of the ELKS N-terminal segment through multivalent interactions, and liprin-α2, by regulating interplay between ELKS and RIM/RIM-BP phase separations, controls protein distributions within the active zone.\",\n      \"method\": \"Structural analysis (crystal/biochemical characterization), phase separation assays, gain-of-function mutation analysis, co-condensation experiments\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — structural and biochemical characterization combined with phase separation assays; single lab\",\n      \"pmids\": [\"33761347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Dengue virus NS5 protein binds and degrades ERC1 to antagonize NF-κB activation, limit proinflammatory cytokine secretion, and reduce cell migration. The degradation involves unique properties of the methyltransferase domain of NS5 not conserved among all four DENV serotypes.\",\n      \"method\": \"Proteomics (NS5-ERC1 interaction), knockdown/overexpression, NF-κB reporter assays, chimeric virus construction, cytokine measurement\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — proteomic identification of binding, functional assays (NF-κB, cytokines, migration), chimeric virus mapping; multiple orthogonal methods\",\n      \"pmids\": [\"37252973\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Crystal structure of the Rab6B–ELKS1 complex reveals that a C-terminal segment of ELKS1 forms a helical hairpin to recognize Rab6B through a unique binding mode. Liquid-liquid phase separation of ELKS1 enhances competition with other Rab6 effectors for Rab6B binding and recruits Rab6B-coated vesicles to exocytotic sites, promoting vesicle exocytosis.\",\n      \"method\": \"Crystal structure determination, biochemical binding assays, LLPS assays, vesicle capture assays, cellular exocytosis assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus reconstitution of LLPS-enhanced vesicle capture; multiple orthogonal methods in single study\",\n      \"pmids\": [\"37172719\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"The ERC1 minimal region for LL5β binding was mapped to ERC1(270-370) and LL5β(381-510); these fragments undergo direct high-affinity interaction involving intrinsically disordered regions (confirmed by NMR). Expression of LL5β(381-510) displaces endogenous ERC1 from the cell edge, reduces invadopodia density, and inhibits transwell invasion.\",\n      \"method\": \"Co-immunoprecipitation, NMR spectroscopy, domain-deletion mapping, dominant-negative fragment expression, invasion assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — NMR and Co-IP for interaction mapping, combined with functional assays; single lab\",\n      \"pmids\": [\"37437062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"During presynaptic homeostatic potentiation at Drosophila active zones, the ELKS-family protein Bruchpilot compacts its nanoscale distribution; this compaction is coupled to increased numbers and decreased mobility of the CaV2.1 ortholog Cacophony (Cac), dependent on direct interaction between Cac's intracellular C-terminus and the membrane-proximal N-terminal region of Bruchpilot/ELKS.\",\n      \"method\": \"In vivo single-molecule imaging of endogenously tagged proteins, presynaptic homeostatic potentiation paradigm, genetic disruption of Cac-Bruchpilot interaction\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo single-molecule imaging plus genetic disruption of specific interaction; single lab but innovative approach\",\n      \"pmids\": [\"36800417\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The shortest N-terminal region of ERC1 (residues 1-244, including an intrinsically disordered region) is sufficient to drive phase separation in vitro and in cells. Deletion of this region alters the biophysical properties of ERC1 condensates and impairs tumor cell motility, without abolishing condensate formation or partner interactions, demonstrating that condensate properties per se are important for ERC1 function in migration.\",\n      \"method\": \"Phase separation assays in vitro and in cells, FRAP, domain-deletion constructs, tumor cell motility assays\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FRAP-validated phase separation with domain mapping and functional motility assays; single lab\",\n      \"pmids\": [\"40646182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Directed insulin secretion from beta cells occurs preferentially at margins of ELKS/LL5β patches at sites devoid of microtubules; TIRF microscopy of intact islets shows secretion restricted to ~5% of ELKS/LL5β patch area, and local MT disassembly together with optimal ELKS content predicts secretion hot spots.\",\n      \"method\": \"TIRF microscopy of intact mouse islets, live imaging of single secretion events, microtubule co-localization analysis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct live TIRF imaging with spatial co-localization of ELKS, LL5β, and MTs; single lab, single method but precise quantitative analysis\",\n      \"pmids\": [\"40366873\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ELKS is expressed in RBL-2H3 mast cells and positively regulates exocytotic release; overexpression increases and knockdown decreases exocytotic activity. ELKS translocates to the plasma membrane after antigen stimulation.\",\n      \"method\": \"Overexpression, siRNA knockdown, immunocytochemistry, live YFP-ELKS imaging, exocytosis assay\",\n      \"journal\": \"Cellular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — gain- and loss-of-function with functional readout and live imaging; single lab, moderate methods\",\n      \"pmids\": [\"19515363\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"HCV NS3 protein physically interacts with ELKS-δ and ELKS-α (ERC1 isoforms) in cultured human cells including HCV replicon-containing cells; NS3 enhances secretion of alkaline phosphatase, with the degree of secretion enhancement correlating with NS3-ELKS-δ binding strength.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, GST pull-down, confocal and immunoelectron microscopy, SEAP secretion assay\",\n      \"journal\": \"The Journal of general virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP and GST pull-down confirming interaction, plus functional secretion correlation; single lab\",\n      \"pmids\": [\"16033967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In mouse forebrain, CAST is the dominant active zone scaffold and ELKS can support CAST function. Combined conditional knockout of CAST and ELKS in the forebrain causes neonatal lethality likely due to impaired sensory-to-motor neurotransmission, while single ELKS KO alone has less severe effects.\",\n      \"method\": \"Conditional knockout mice (CaMKII-Cre), histological analysis, behavioral observation, anatomical mapping of sensory circuits\",\n      \"journal\": \"Molecular brain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic double KO with anatomical and behavioral analysis; single lab, functional phenotype established\",\n      \"pmids\": [\"31996256\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ERC1/ELKS is a multi-domain scaffold protein (rich in coiled-coil and intrinsically disordered regions) that functions at presynaptic active zones and plasma membrane-associated platforms: at synapses and secretory sites, it directly binds RIM, Bassoon/Piccolo, the VDCC-β subunit, and Rab6, and it scaffolds the assembly of Ca2+ channel-dense release sites to support neurotransmitter and hormone (insulin) exocytosis; in the NF-κB pathway, ELKS is an IKK complex subunit that recruits IκBα and, upon genotoxic stress, undergoes K63-polyubiquitination by XIAP/UBC13 to recruit TAK1 for IKK activation; in migrating cells, ERC1 forms liquid-like condensates with liprin-α1 and LL5β at the cell leading edge to promote focal adhesion turnover and active integrin internalization; and several viruses (dengue NS5, HCV NS3) exploit or degrade ERC1 to modulate secretion and NF-κB responses.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ERC1 (ELKS/CAST) is a coiled-coil and intrinsically-disordered scaffold protein that organizes membrane-associated assembly platforms for regulated exocytosis, NF-\\u03baB signaling, and cell migration through phase-separated condensate formation [#2, #14, #20]. At presynaptic active zones it directly binds the RIM PDZ domain and forms hetero-oligomers within the active zone fraction, co-localizing with Bassoon [#2, #4], and conditional double knockout of ELKS1/2 reduces inhibitory neurotransmitter release and action potential-triggered Ca2+ influx [#10]. ELKS positively regulates voltage-gated Ca2+ channel density and vesicle fusogenicity at central synapses [#12], and at pancreatic beta cells it binds the GK domain of the VDCC-\\u03b2 subunit to support L-type Ca2+ current and first-phase insulin secretion at the plasma-membrane vascular face [#5, #13]. ELKS recognizes Rab6B via a C-terminal helical hairpin, and its liquid-liquid phase separation captures Rab6-coated vesicles at exocytotic sites [#17]. Independently of its synaptic role, ELKS is an essential regulatory subunit of the IKK complex that recruits I\\u03baB\\u03b1 to drive NF-\\u03baB target gene expression [#3]; upon genotoxic stress it is K63-polyubiquitinated by XIAP/UBC13 to recruit the TAK1/TAB2-3 complex and activate IKK [#8]. In migrating cells ERC1 forms liquid-like condensates with liprin-\\u03b11 and LL5\\u03b2 at the leading edge that promote focal adhesion turnover and active integrin \\u03b21 internalization, with the condensate biophysical properties themselves being required for tumor cell motility [#9, #11, #20]. Dengue virus NS5 and HCV NS3 target ELKS to modulate NF-\\u03baB responses and secretion [#16, #23]. ELKS coupled the dimerization domains it uses for oligomerization were first identified as a constitutively activating fusion partner of the RET kinase in papillary thyroid carcinoma [#0].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"The first characterization established ELKS as a multi-coiled-coil dimerizing protein, discovered through an oncogenic rearrangement that fused its oligomerization domains to RET to constitutively activate the kinase.\",\n      \"evidence\": \"cDNA cloning of a thyroid carcinoma rearrangement and in vitro synthesis of chimeric proteins with anti-phosphotyrosine immunoblotting\",\n      \"pmids\": [\"10337992\", \"12203787\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not define the normal cellular function of ELKS\", \"Multiple splice isoforms identified but their distinct functions not resolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Two parallel studies revealed dual functions: ELKS as a direct RIM-binding active zone scaffold, and as an essential IKK complex subunit recruiting I\\u03baB\\u03b1 for NF-\\u03baB signaling, establishing the gene's bifurcated biology.\",\n      \"evidence\": \"Subcellular fractionation, reciprocal Co-IP, immunoEM in rat brain; RNAi and NF-\\u03baB reporter assays in cells\",\n      \"pmids\": [\"14723704\", \"15218148\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship between synaptic and NF-\\u03baB pools unclear\", \"Structural basis of RIM and I\\u03baB\\u03b1 binding not resolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"In vivo genetics in C. elegans showed ELKS-1 binds the RIM PDZ domain and anchors a RIM fragment to release sites, but with redundant anchoring mechanisms, refining how ELKS contributes to active zone assembly.\",\n      \"evidence\": \"C. elegans loss-of-function mutants with domain-truncation localization and behavioral assays\",\n      \"pmids\": [\"15976086\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of redundant anchoring factors not defined\", \"Quantitative contribution to release not measured\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"ELKS was extended beyond neurons to endocrine secretion, shown to organize docked insulin granules and support glucose-evoked insulin release in beta cells.\",\n      \"evidence\": \"TIRF and immunoEM, dominant-negative fragment overexpression, siRNA, and insulin secretion assays; plus HCV NS3 interaction shown the same year\",\n      \"pmids\": [\"15888548\", \"16033967\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking docking to Ca2+ channels not yet defined\", \"Whether secretion role uses the same RIM interface unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Genetic and biochemical work linked ELKS to liprin-\\u03b1 (SYD-2) for active zone assembly and to the RIM2-Munc13 pathway for Ca2+-dependent exocytosis, connecting it into a broader scaffold network.\",\n      \"evidence\": \"C. elegans epistasis with Co-IP of mutant SYD-2; PC12 overexpression/deletion constructs with growth hormone secretion assay\",\n      \"pmids\": [\"17115037\", \"16716196\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct liprin-ELKS binding interface not mapped\", \"Stoichiometry of the scaffold network unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"The NF-\\u03baB role was mechanized for genotoxic stress: ELKS is K63-polyubiquitinated by XIAP/UBC13 to recruit TAK1 via TAB2/3, assembling the kinase complexes needed for IKK activation.\",\n      \"evidence\": \"Ubiquitination assays with defined E3/E2, Co-IP of assembled complexes, RNAi and dominant-negative controls\",\n      \"pmids\": [\"20932476\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitination site(s) on ELKS not mapped\", \"Signal terminating the ubiquitin-dependent assembly unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Definitive mouse genetics quantified ELKS's synaptic role, and a new cell-migration function emerged through ERC1-liprin-\\u03b11-LL5\\u03b2 complexes regulating integrin turnover.\",\n      \"evidence\": \"Conditional ELKS1/2 double-KO with electrophysiology, Ca2+ imaging and EM; siRNA depletion with invasion and integrin internalization assays\",\n      \"pmids\": [\"25209271\", \"24982445\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ELKS sets Ca2+ influx without changing channel levels at inhibitory terminals unresolved\", \"Link between migration and synaptic scaffold functions unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"The migration function was refined: ERC1 and liprin-\\u03b11 co-localize with active integrin clusters to drive focal adhesion disassembly and influence Rab7 endosome positioning.\",\n      \"evidence\": \"siRNA, dominant-negative liprin-N expression, live imaging and Co-IP\",\n      \"pmids\": [\"27659488\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct link to endosomal trafficking machinery not established\", \"Causal chain from adhesion disassembly to protrusion incomplete\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Conditional KO at the calyx of Held showed CAST/ELKS positively regulate CaV2.1 channel density and control vesicle fusogenicity through a post-priming step, mechanizing the Ca2+ influx phenotype.\",\n      \"evidence\": \"Conditional KO mice with patch-clamp, EM and immunohistochemistry\",\n      \"pmids\": [\"29996090\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of CaV2.1 density regulation not identified\", \"Identity of the post-priming step molecular target unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Two studies provided molecular mechanism: ELKS directly binds the VDCC-\\u03b2 GK domain to support beta-cell Ca2+ current and insulin secretion, and ERC1 forms flexible dimers and liquid-like condensates hosting motility partners.\",\n      \"evidence\": \"Beta-cell-specific KO with Co-IP, Ca2+ imaging, patch-clamp; EM, single-molecule analysis and FRAP for condensates\",\n      \"pmids\": [\"30699350\", \"31537859\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How VDCC-\\u03b2 binding sets channel density mechanistically unclear\", \"Functional necessity of condensates not yet tested directly\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Phase separation was shown to govern active zone organization, with oligomerized liprin-\\u03b12 promoting ELKS N-terminal phase separation and controlling protein distributions among ELKS, RIM and RIM-BP.\",\n      \"evidence\": \"Structural/biochemical characterization with phase separation and co-condensation assays\",\n      \"pmids\": [\"33761347\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo relevance of the reconstituted phase behavior not confirmed\", \"Quantitative effect on release not measured\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"A structural and mechanistic synthesis defined how ELKS captures vesicles: a C-terminal helical hairpin recognizes Rab6B and LLPS enhances competition for Rab6 to recruit vesicles to exocytotic sites; complementary work mapped the LL5\\u03b2 binding region and showed viral and CaV interactions.\",\n      \"evidence\": \"Rab6B-ELKS1 crystal structure with LLPS and vesicle capture assays; NMR mapping of ERC1-LL5\\u03b2; DENV NS5 proteomics; Drosophila single-molecule imaging\",\n      \"pmids\": [\"37172719\", \"37437062\", \"37252973\", \"36800417\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Rab6 capture and synaptic RIM scaffolding use overlapping ELKS surfaces unclear\", \"How NS5 selectively degrades ELKS at the molecular level incomplete\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Functional dissection established that condensate biophysical properties per se, driven by the ERC1 N-terminal IDR, are required for tumor cell motility, and that directed insulin secretion occurs at margins of ELKS/LL5\\u03b2 patches lacking microtubules.\",\n      \"evidence\": \"In vitro/in-cell phase separation with FRAP and domain deletions plus motility assays; TIRF of intact islets with microtubule co-localization\",\n      \"pmids\": [\"40646182\", \"40366873\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic link between condensate material properties and motility machinery unknown\", \"How microtubule absence and ELKS content jointly set secretion hot spots unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown how a single scaffold reconciles its distinct roles across active zones, endocrine secretion, NF-\\u03baB signaling and cell migration, and whether isoform identity or phase-separation state selects between these functions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model of how ERC1 isoforms partition among its functions\", \"Structural basis for mutually exclusive vs. coexisting partner interactions undefined\", \"No human Mendelian disease association established in the corpus\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [2, 3, 9, 13, 17]},\n      {\"term_id\": \"GO:0005515\", \"supporting_discovery_ids\": [2, 4, 13, 17, 18]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [5, 9, 13, 21, 22]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [14, 20]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [5, 17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [2, 4, 10, 12]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [3, 8, 16]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [5, 7, 17, 22]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 8]}\n    ],\n    \"complexes\": [\"IKK complex\", \"presynaptic active zone cytomatrix\", \"ERC1-liprin-\\u03b11-LL5\\u03b2 leading-edge complex\"],\n    \"partners\": [\"RIM1\", \"Bassoon\", \"liprin-\\u03b11\", \"LL5\\u03b2\", \"IKBKB\", \"Rab6B\", \"CACNB\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}