{"gene":"EZR","run_date":"2026-06-09T23:54:43","timeline":{"discoveries":[{"year":2019,"finding":"Hypoxia-induced autophagy drives phosphorylation of EZR (ezrin) at Thr567, mediated by PRKCA/PKCα as the upstream kinase; knockdown of autophagy genes ATG5, BNIP3, BNIP3L, or BECN1 reversed this phosphorylation, establishing a hypoxia-autophagy-PKC-EZR signaling axis that regulates tumor-initiating cell self-renewal.","method":"Gene knockdown (shRNA/siRNA), pharmacological inhibition, phospho-specific immunostaining, in vivo tumor initiation assays","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal KD approaches and in vivo validation in single lab, but no in vitro reconstitution of kinase-substrate relationship","pmids":["31775562"],"is_preprint":false},{"year":2009,"finding":"Transcription of the EZR/VIL2 gene in esophageal carcinoma cells is controlled by Sp1 and AP-1 (c-Jun/c-Fos) binding to a minimal promoter region (-87/-32); these transcription factors bind their respective sites and are activated downstream of the MEK1/2-ERK1/2 signaling pathway.","method":"Luciferase reporter with deletion/site-directed mutants, EMSA, chromatin immunoprecipitation, pharmacological inhibitors","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (EMSA, ChIP, reporter assays, mutagenesis) in a single focused study establishing the promoter mechanism","pmids":["19164283"],"is_preprint":false},{"year":2016,"finding":"The histone methyltransferase SMYD3 directly binds to the EZR promoter region and stimulates EZR transcription; ChIP assay confirmed SMYD3 occupancy at the EZR promoter, and SMYD3 knockdown suppressed EZR expression, cell proliferation, migration, and invasion.","method":"Chromatin immunoprecipitation (ChIP), RNAi knockdown, in vitro and in vivo functional assays","journal":"Human pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus functional phenotypic rescue in a single lab; replicated conceptually in PMID:29253179","pmids":["26980013"],"is_preprint":false},{"year":2018,"finding":"Antisense lncRNA EZR-AS1 recruits SMYD3 to a GC-rich region downstream of the EZR promoter, causing H3K4me3 enrichment and enhanced EZR transcription; EZR-AS1 also forms a complex with RNA polymerase II to activate EZR transcription.","method":"Co-immunoprecipitation, ChIP, RNA pulldown, reporter assays, in vivo xenograft","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (Co-IP, ChIP, reporter) in a single lab; note this paper is about the lncRNA regulating EZR transcription, not about EZR protein mechanism per se","pmids":["29253179"],"is_preprint":false},{"year":2015,"finding":"TPA (phorbol ester) induces over-expression of EZR/VIL2 variant 1 (but not variant 2) in ESCC cells via activation of MEK/ERK1/2 signaling, which increases c-Jun and Sp1 binding to the AP-1 and Sp1 composite TPA-responsive element in the VIL2 V1 promoter; MEK inhibitor U0126 blocks this induction, and ezrin silencing partially reverses TPA-promoted cell migration.","method":"Promoter-luciferase assays, ChIP, pharmacological inhibitors (U0126), siRNA knockdown, migration assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (reporter, ChIP, inhibitors, KD) in one lab; consistent with PMID:19164283 findings","pmids":["25915860"],"is_preprint":false},{"year":2011,"finding":"A DNA enhancer element for the VIL2/EZR gene was mapped to the -1297/-1186 region upstream of the VIL2 promoter; this element functions in a position- and orientation-dependent manner to enhance VIL2 promoter activity in HEK-293 cells.","method":"Luciferase reporter assays with deletion constructs in transiently transfected HEK-293 cells","journal":"Cell biology international","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — systematic deletion mapping with reporter assays, single lab, single method","pmids":["21585339"],"is_preprint":false},{"year":2021,"finding":"EZR promotes pancreatic cancer cell proliferation, migration, and invasion via activation of the FAK/AKT signaling pathway; EZR knockdown suppressed these phenotypes and reduced FAK protein levels and downstream signaling.","method":"siRNA knockdown, Western blot, CCK-8 assay, Transwell assay","journal":"Cancer cell international","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, KD with phenotypic readout and Western blot for pathway, no direct biochemical interaction shown between EZR and FAK","pmids":["34627255"],"is_preprint":false},{"year":2022,"finding":"EZR knockdown inhibited RhoA, Rac1, and Cdc42 activity in breast cancer cells, as confirmed by RhoA activation assays, placing EZR upstream of these small GTPases in regulating cancer cell migration and invasion.","method":"siRNA knockdown, RhoA/Rac1/Cdc42 activation (pulldown) assays, migration and invasion assays","journal":"Oncology research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, GTPase activation assays with KD, limited mechanistic detail on how EZR connects to Rho GTPases","pmids":["37304008"],"is_preprint":false},{"year":2024,"finding":"SIRT7, a desuccinylase, suppresses succinylation of EZR at the Lys60 site; SIRT7 knockdown promoted EZR succinylation at K60, and EZR overexpression induced higher melanin synthesis in melanocytes, whereas EZR knockdown blocked SIRT7-loss-induced melanin synthesis, placing EZR downstream of SIRT7-regulated succinylation in melanin biosynthesis.","method":"Co-immunoprecipitation, immunoprecipitation, Western blot, rescue experiments, tyrosinase activity assay, melanin content measurement","journal":"Clinical, cosmetic and investigational dermatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, IP, and functional rescue in single lab; identifies a specific PTM site (K60 succinylation) and its functional consequence","pmids":["38933605"],"is_preprint":false},{"year":2017,"finding":"Ezrin (Vil2) is required for proper bile duct fluidity and alkalinity regulation; ezrin-knockdown (Vil2kd/kd) mice exhibit severe hepatic injury resembling intrahepatic cholestatic disease, and UDCA treatment ameliorated hepatic function and fibrosis in these mice independently of biliary bicarbonate secretion.","method":"Vil2kd/kd knockdown mouse model, histology, liver function assays, gene expression analysis, in vitro cholangiocyte cytotoxicity","journal":"Biological & pharmaceutical bulletin","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — established genetic model with defined hepatic phenotype and mechanistic dissection of UDCA action; single lab","pmids":["28049946"],"is_preprint":false},{"year":2024,"finding":"A missense variant (P471L) in EZR was identified in a family with congenital nuclear cataract; EZR knockout in zebrafish using TALENs caused developmental delays manifesting as multilayered lens epithelial cells with abnormal proliferation patterns, indicating ezrin is required for enucleation and differentiation of lens epithelial cells.","method":"Linkage analysis, whole-exome sequencing, TALEN-mediated zebrafish knockout, histology, immunohistochemistry","journal":"Ophthalmic genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo genetic model (zebrafish KO) with defined cellular phenotype plus human variant identification; single lab","pmids":["38563525"],"is_preprint":false},{"year":2026,"finding":"EZR depletion in breast cancer cells suppressed STAT3 Tyr705 phosphorylation and downstream pro-survival signaling; STAT3 activation partially rescued EZR-loss phenotypes (reduced proliferation, migration, invasion, increased apoptosis), establishing that EZR sustains STAT3 signaling to drive metastatic competence and paclitaxel resistance.","method":"Stable EZR silencing (shRNA), phospho-kinase profiling, immunoblot, STAT3 activation rescue, orthotopic xenograft, lung colonization model, paclitaxel-resistant subline generation","journal":"Life sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (KD, phospho-profiling, rescue, in vivo) in single lab; no direct biochemical interaction between EZR and STAT3 shown","pmids":["41621788"],"is_preprint":false},{"year":2025,"finding":"ERK phosphorylates the C-terminal tail of the Ezrin-activating kinase LOK, inhibiting LOK's activation of Ezrin in the cell body; this releases Ezrin's inhibition of Rho (via ARHGAP18 recruitment) and promotes stress fiber assembly for cell migration, establishing an ERK-LOK-Ezrin-ARHGAP18-Rho signaling cascade.","method":"Molecular perturbations, live-cell imaging, kinase activity assays, epistasis experiments in migrating cells","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple perturbations and epistasis in single preprint lab; mechanistic pathway placement is clear but awaits peer review","pmids":[],"is_preprint":true},{"year":2025,"finding":"PI(4,5)P2 binding to the Ezrin FERM domain (F1 and F3 subdomains) outcompetes other phospholipids and triggers a conformational rearrangement that destabilizes the FERM F2-CTD interface, enabling spontaneous dissociation of the non-phosphorylated C-terminal domain (CTD); T567 phosphorylation subsequently impedes FERM-CTD reassociation, stabilizing the open active conformation. EBP50 competes with the CTD for F2-F3 FERM binding after CTD dissociation.","method":"Enhanced sampling molecular dynamics (metadynamics), free energy calculations, contact-map collective variables, biochemical validation","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — rigorous computational (Tier 1 for structural mechanism) with biochemical validation in single preprint; awaits full peer-reviewed replication","pmids":[],"is_preprint":true},{"year":2025,"finding":"Both PC1 and PC2 polycystins co-immunoprecipitate Ezrin; acute loss of polycystins reduced Ezrin protein abundance and caused mis-localization of active Ezrin away from the apical surface in renal epithelial cells, and PKC inhibition phenocopied this loss, implicating the polycystin complex in regulating Ezrin phosphorylation and apical cell shape.","method":"Co-immunoprecipitation, inducible Pkd1/Pkd2 knockout, immunofluorescence, 3D tubuloid culture, pharmacological inhibitors (NSC668394, PKC inhibitor)","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — Co-IP plus KO localization data in single preprint; PKC link is pharmacological only","pmids":[],"is_preprint":true},{"year":2025,"finding":"Phactr4 loss leads to Ezrin hyperphosphorylation in macrophages, and ezrin inhibition reverses the membrane protrusion defects caused by Phactr4 knockdown, placing Ezrin downstream of the PP1-Phactr4 phosphatase axis in controlling lamellipodial dynamics and macrophage migration.","method":"siRNA knockdown, pharmacological ezrin inhibition, live-cell imaging, epistasis experiments","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — genetic/pharmacological epistasis in single preprint, single lab","pmids":[],"is_preprint":true},{"year":2025,"finding":"In bleb-based migration of metastatic melanoma cells under confinement, CD44 and ERM proteins (including Ezrin) restrict EGFR mobility within a membrane-apposed cortical actin meshwork at the bleb rear, establishing a rear-to-front EGFR-PI3K-Rac1 activity gradient required for bleb stability and polarized migration.","method":"High-resolution time-lapse imaging, protein activity biosensors, optogenetics, specific molecular perturbations","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — live imaging and perturbations in single preprint; ERM contribution not distinguished from other ERM family members","pmids":[],"is_preprint":true},{"year":2024,"finding":"Erbin physically interacts with NHERF1, Ezrin, and HER2 in actin-rich membrane protrusions of HER2-positive breast cancer cells; Erbin knockdown disrupted the HER2/NHERF1/Ezrin/HSP90 protein complex, reducing HER2 signaling, and inhibition of Ezrin disrupted Erbin's ability to interact with HER2, establishing Ezrin as a scaffold component of this signaling complex.","method":"Co-immunoprecipitation, knockdown, immunofluorescence in SKBR3 cells and MMTV-Neu mammary glands","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — reciprocal Co-IP in single preprint, single lab; awaits peer review","pmids":[],"is_preprint":true},{"year":2024,"finding":"Integrin beta 4 (ITGB4) directly interacts with Ezrin (EZR) as confirmed by co-immunoprecipitation and co-immunofluorescence; ITGB4 knockdown decreased EZR expression at both mRNA and protein levels, and EZR overexpression rescued the pro-tumorigenic phenotypes suppressed by ITGB4 silencing, establishing ITGB4 as an upstream regulator of EZR that activates Wnt/β-catenin signaling in colorectal cancer.","method":"Co-immunoprecipitation, co-immunofluorescence, RNA-seq, Western blot, functional rescue assays, xenograft model","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — Co-IP and rescue in single preprint; awaits peer review","pmids":[],"is_preprint":true},{"year":2025,"finding":"PI(4,5)P2 asymmetrically incorporated into supported lipid bilayers retains functionality and recruits ezrin to the membrane, demonstrating that ezrin binding to PI(4,5)P2 is sufficient for membrane recruitment in a reconstituted system.","method":"Supported lipid bilayer reconstitution, FRAP, fluorescence microscopy","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 1 / Weak — in vitro reconstitution in single preprint; establishes PI(4,5)P2-dependent membrane recruitment but is a methods-focused paper","pmids":[],"is_preprint":true},{"year":2025,"finding":"Inhibition of ezrin phosphorylation (using small molecule inhibitors) reduced mechano-protection of cells against hypo-osmotic shock by weakening cortical actin contractility and shifting actin organization from the cortex to stress fibers via formin-mediated actin polymerization; formin inhibition (SMIFH2) prevented this stress fiber increase and blocked the subsequent increase in cell rupture rates.","method":"Small molecule ezrin inhibitors, formin inhibitor (SMIFH2), hypo-osmotic shock assay, live-cell imaging, traction force measurements","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — pharmacological inhibitors and epistasis in single preprint, CHO cells","pmids":[],"is_preprint":true},{"year":2024,"finding":"SLK and Ezrin both significantly influence actin cytoskeleton architecture; differential effects were observed between protein knockdown and dephosphorylation, suggesting phosphorylation-independent roles for Ezrin in modulating actin dynamics beyond its canonical activation by T567 phosphorylation.","method":"siRNA knockdown, pharmacological inhibitors, actin structure imaging in HaCaT cells","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single preprint, single lab, pharmacological/KD approach without direct biochemical mechanism identified","pmids":[],"is_preprint":true},{"year":2028,"finding":"FOXF2 transcription factor directly interacts with EZR and inhibits EZR transcriptional expression; FOXF2 knockdown enhanced ESCC cell growth and metastasis in vitro and in vivo, and suppression of ERBB2 signaling function was shown to be downstream of EZR regulation by FOXF2.","method":"Western blot, qRT-PCR, plasmid transfection, lentiviral infection, co-IP (implied by 'directly interacted'), migration/invasion assay, xenograft model","journal":"Translational cancer research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single paper; 'direct interaction' claim relies on computational and expression data with limited biochemical validation per abstract","pmids":["39816549"],"is_preprint":false}],"current_model":"EZR (ezrin) is a membrane-cytoskeletal linker protein whose transcription is regulated by Sp1/AP-1 transcription factors downstream of MEK/ERK signaling and by epigenetic mechanisms involving SMYD3-mediated H3K4 methylation; the protein is activated through a two-step mechanism in which FERM-domain binding to PI(4,5)P2 triggers spontaneous CTD dissociation and T567 phosphorylation (by kinases including PKCα and LOK) stabilizes the open conformation, enabling actin engagement; active EZR links the plasma membrane to cortical actin to regulate cell shape, migration, and mechano-protection, and acts as a signaling scaffold that modulates RhoA/Rac1/Cdc42 GTPase activity (partly via ARHGAP18), FAK/AKT, STAT3, and Wnt/β-catenin pathways; additionally, EZR succinylation at K60 is regulated by the desuccinylase SIRT7 to control melanin synthesis, and ezrin is required for bile duct function and lens epithelial cell differentiation in vivo."},"narrative":{"mechanistic_narrative":"EZR (ezrin) is a membrane–cytoskeletal linker and signaling scaffold whose activation couples plasma-membrane lipid cues to cortical actin organization, cell shape, and motility. The protein is held in a closed autoinhibited state by an intramolecular FERM–C-terminal domain (CTD) interface; PI(4,5)P2 binding to the F1/F3 FERM subdomains outcompetes other phospholipids and destabilizes the F2–CTD interface, allowing spontaneous CTD dissociation, after which Thr567 phosphorylation prevents reassociation and locks the open active conformation, while EBP50 competes for the freed F2–F3 surface. PI(4,5)P2 binding alone is sufficient to recruit ezrin to membranes. T567 phosphorylation is driven by upstream kinases including PKCα within a hypoxia–autophagy axis [PMID:31775562] and by LOK, which is itself restrained by ERK; this ERK–LOK–ezrin module controls Rho activity through ARHGAP18 recruitment and governs stress-fiber assembly during migration. Active ezrin sustains cortical actin contractility and protects cells against osmotic rupture, with its inhibition redirecting actin from the cortex to formin-dependent stress fibers. EZR expression is transcriptionally controlled by Sp1 and AP-1 (c-Jun/c-Fos) acting downstream of MEK/ERK signaling [PMID:19164283, PMID:25915860] and by epigenetic activation through SMYD3-mediated H3K4 methylation [PMID:26980013]. In cancer cells, ezrin acts upstream of RhoA/Rac1/Cdc42 GTPases and sustains FAK/AKT and STAT3 signaling to promote proliferation, migration, invasion, and therapy resistance [PMID:37304008, PMID:34627255, PMID:41621788]. A specific PTM, K60 succinylation reversed by the desuccinylase SIRT7, links ezrin to melanin synthesis [PMID:38933605]. In vivo, ezrin is required for bile duct fluid regulation, and loss produces cholestatic hepatic injury [PMID:28049946], and a missense EZR variant with zebrafish knockout data implicates ezrin in lens epithelial cell differentiation in congenital cataract [PMID:38563525].","teleology":[{"year":2009,"claim":"Established how EZR transcription is controlled, identifying the cis-elements and transcription factors that set ezrin expression levels.","evidence":"Promoter deletion/mutation luciferase reporters, EMSA, and ChIP in esophageal carcinoma cells mapping Sp1/AP-1 binding downstream of MEK-ERK","pmids":["19164283"],"confidence":"High","gaps":["Does not address ezrin protein activation or function","Promoter behavior characterized in a single cancer cell context"]},{"year":2011,"claim":"Extended transcriptional regulation by mapping a distal enhancer element governing VIL2/EZR promoter activity.","evidence":"Deletion-construct luciferase reporters in HEK-293 cells","pmids":["21585339"],"confidence":"Medium","gaps":["Trans-acting factors binding the enhancer not identified","Single method, single cell line"]},{"year":2015,"claim":"Connected an extracellular stimulus (phorbol ester) to isoform-specific EZR induction through MEK/ERK-driven Sp1/AP-1 occupancy of the V1 promoter.","evidence":"Promoter-luciferase, ChIP, U0126 inhibition, and siRNA migration assays in ESCC cells","pmids":["25915860"],"confidence":"Medium","gaps":["Does not resolve why variant 2 is unresponsive","Functional rescue of migration only partial"]},{"year":2016,"claim":"Identified an epigenetic input to EZR expression, showing SMYD3 occupies the EZR promoter to stimulate transcription.","evidence":"ChIP, RNAi knockdown, and in vitro/in vivo functional assays","pmids":["26980013"],"confidence":"Medium","gaps":["Did not define the chromatin mark deposited","Mechanism of SMYD3 recruitment unresolved"]},{"year":2017,"claim":"Demonstrated an in vivo physiological requirement for ezrin in bile duct function, beyond its cancer-cell roles.","evidence":"Vil2kd/kd knockdown mouse model with histology, liver function assays, and UDCA treatment","pmids":["28049946"],"confidence":"Medium","gaps":["Molecular link between ezrin and biliary fluid regulation not defined","Single model system"]},{"year":2018,"claim":"Resolved how SMYD3 is targeted to EZR, showing antisense lncRNA EZR-AS1 recruits SMYD3 to deposit H3K4me3 and engages RNA Pol II.","evidence":"Co-IP, ChIP, RNA pulldown, reporter assays, and xenografts","pmids":["29253179"],"confidence":"Medium","gaps":["Concerns transcriptional regulation, not ezrin protein mechanism","Single lab"]},{"year":2019,"claim":"Placed ezrin T567 phosphorylation within a hypoxia–autophagy–PKCα signaling axis controlling tumor-initiating cell self-renewal.","evidence":"Autophagy-gene and kinase knockdown, pharmacological inhibition, phospho-immunostaining, and in vivo tumor initiation","pmids":["31775562"],"confidence":"Medium","gaps":["No in vitro reconstitution of PKCα–ezrin kinase-substrate relationship","How autophagy couples to PKCα activation unclear"]},{"year":2021,"claim":"Linked ezrin to FAK/AKT signaling as a driver of pancreatic cancer proliferation and invasion.","evidence":"siRNA knockdown, Western blot, proliferation and Transwell assays","pmids":["34627255"],"confidence":"Low","gaps":["No direct biochemical interaction between EZR and FAK shown","Single lab phenotypic readout"]},{"year":2022,"claim":"Positioned ezrin upstream of Rho-family GTPases in cancer cell motility.","evidence":"siRNA knockdown with RhoA/Rac1/Cdc42 activation pulldown and migration/invasion assays","pmids":["37304008"],"confidence":"Low","gaps":["Mechanism connecting ezrin to GTPase activation not defined","Single lab"]},{"year":2024,"claim":"Identified K60 succinylation as a SIRT7-regulated PTM coupling ezrin to melanin biosynthesis, broadening ezrin regulation beyond T567 phosphorylation.","evidence":"Co-IP, IP, Western blot, rescue, and tyrosinase/melanin assays in melanocytes","pmids":["38933605"],"confidence":"Medium","gaps":["Structural/functional consequence of K60 succinylation on ezrin conformation unknown","Succinyltransferase not identified"]},{"year":2024,"claim":"Implicated ezrin in lens epithelial differentiation, linking a human EZR missense variant to congenital cataract.","evidence":"Linkage analysis, whole-exome sequencing, and TALEN-mediated zebrafish knockout with histology","pmids":["38563525"],"confidence":"Medium","gaps":["Functional impact of the P471L variant on ezrin activity not assayed","Single family"]},{"year":2025,"claim":"Defined the structural-mechanistic basis of ezrin activation, showing PI(4,5)P2 binding triggers CTD dissociation that T567 phosphorylation then stabilizes.","evidence":"Enhanced-sampling molecular dynamics, free-energy calculations, and biochemical validation (preprint)","pmids":[],"confidence":"Medium","gaps":["Computational model awaits full peer-reviewed experimental confirmation","EBP50 competition step inferred from simulation"]},{"year":2025,"claim":"Established an ERK–LOK–ezrin–ARHGAP18–Rho cascade controlling stress-fiber assembly and directed migration.","evidence":"Molecular perturbations, live-cell imaging, kinase assays, and epistasis in migrating cells (preprint)","pmids":[],"confidence":"Medium","gaps":["Awaits peer review","Quantitative contribution of LOK versus other ezrin kinases unresolved"]},{"year":2025,"claim":"Demonstrated ezrin's role in cortical mechano-protection, where its activity maintains cortical contractility against osmotic rupture.","evidence":"Ezrin and formin small-molecule inhibitors, hypo-osmotic shock, live imaging, and traction force in CHO cells (preprint)","pmids":[],"confidence":"Low","gaps":["Single preprint, pharmacological approach","Direct ezrin–formin relationship not biochemically defined"]},{"year":null,"claim":"How the lipid-triggered structural activation, the multiple PTMs (T567 phosphorylation, K60 succinylation), and the diverse downstream effectors (Rho GTPases, FAK/AKT, STAT3, Wnt/β-catenin) are integrated into context-specific ezrin functions in vivo remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No unified model linking activation state to specific effector engagement","Most cancer-pathway links lack direct ezrin–effector biochemistry","Several key mechanisms exist only as preprints"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[13,20]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[13,19]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[17]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[13,19,14]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[20,21]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[12,7]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,2,4]}],"complexes":[],"partners":["PRKCA","SLK","ARHGAP18","EBP50","NHERF1","ITGB4","FOXF2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P15311","full_name":"Ezrin","aliases":["Cytovillin","Villin-2","p81"],"length_aa":586,"mass_kda":69.4,"function":"Probably involved in connections of major cytoskeletal structures to the plasma membrane. In epithelial cells, required for the formation of microvilli and membrane ruffles on the apical pole. Along with PLEKHG6, required for normal macropinocytosis","subcellular_location":"Apical cell membrane; Cell projection; Cell projection, microvillus membrane; Cell projection, ruffle membrane; Cytoplasm, cell cortex; Cytoplasm, cytoskeleton; Cell projection, microvillus","url":"https://www.uniprot.org/uniprotkb/P15311/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/EZR","classification":"Not Classified","n_dependent_lines":7,"n_total_lines":1208,"dependency_fraction":0.005794701986754967},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000092820","cell_line_id":"CID000873","localizations":[{"compartment":"membrane","grade":3}],"interactors":[{"gene":"MSN","stoichiometry":4.0},{"gene":"CD151","stoichiometry":0.2},{"gene":"EMC9","stoichiometry":0.2},{"gene":"DCAF8","stoichiometry":0.2},{"gene":"NEMF","stoichiometry":0.2},{"gene":"RDX","stoichiometry":0.2},{"gene":"PDZD8","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000873","total_profiled":1310},"omim":[{"mim_id":"621119","title":"ENKURIN DOMAIN-CONTAINING PROTEIN 1; ENKD1","url":"https://www.omim.org/entry/621119"},{"mim_id":"619206","title":"SCHWANNOMIN-INTERACTING PROTEIN 1; SCHIP1","url":"https://www.omim.org/entry/619206"},{"mim_id":"605018","title":"CYLD LYSINE-63 DEUBIQUITINASE; CYLD","url":"https://www.omim.org/entry/605018"},{"mim_id":"602632","title":"PODOCALYXIN-LIKE; PODXL","url":"https://www.omim.org/entry/602632"},{"mim_id":"137170","title":"GAMMA-GLUTAMYL CYCLOTRANSFERASE; GGCT","url":"https://www.omim.org/entry/137170"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Plasma membrane","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/EZR"},"hgnc":{"alias_symbol":[],"prev_symbol":["VIL2"]},"alphafold":{"accession":"P15311","domains":[{"cath_id":"3.10.20.90","chopping":"4-83","consensus_level":"high","plddt":95.5945,"start":4,"end":83},{"cath_id":"1.20.5","chopping":"297-347","consensus_level":"medium","plddt":91.5471,"start":297,"end":347}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P15311","model_url":"https://alphafold.ebi.ac.uk/files/AF-P15311-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P15311-F1-predicted_aligned_error_v6.png","plddt_mean":87.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=EZR","jax_strain_url":"https://www.jax.org/strain/search?query=EZR"},"sequence":{"accession":"P15311","fasta_url":"https://rest.uniprot.org/uniprotkb/P15311.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P15311/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P15311"}},"corpus_meta":[{"pmid":"31775562","id":"PMC_31775562","title":"Hypoxia-induced autophagy drives colorectal cancer initiation and progression by activating the PRKC/PKC-EZR (ezrin) pathway.","date":"2019","source":"Autophagy","url":"https://pubmed.ncbi.nlm.nih.gov/31775562","citation_count":147,"is_preprint":false},{"pmid":"29253179","id":"PMC_29253179","title":"The interaction of lncRNA EZR-AS1 with SMYD3 maintains overexpression of EZR in ESCC cells.","date":"2018","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/29253179","citation_count":85,"is_preprint":false},{"pmid":"30655286","id":"PMC_30655286","title":"Long noncoding RNA ANRIL regulates endothelial cell activities associated with coronary artery disease by up-regulating CLIP1, EZR, and LYVE1 genes.","date":"2019","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/30655286","citation_count":59,"is_preprint":false},{"pmid":"19164283","id":"PMC_19164283","title":"Sp1 and AP-1 regulate expression of the human gene VIL2 in esophageal carcinoma 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\"finding\": \"Hypoxia-induced autophagy drives phosphorylation of EZR (ezrin) at Thr567, mediated by PRKCA/PKCα as the upstream kinase; knockdown of autophagy genes ATG5, BNIP3, BNIP3L, or BECN1 reversed this phosphorylation, establishing a hypoxia-autophagy-PKC-EZR signaling axis that regulates tumor-initiating cell self-renewal.\",\n      \"method\": \"Gene knockdown (shRNA/siRNA), pharmacological inhibition, phospho-specific immunostaining, in vivo tumor initiation assays\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal KD approaches and in vivo validation in single lab, but no in vitro reconstitution of kinase-substrate relationship\",\n      \"pmids\": [\"31775562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Transcription of the EZR/VIL2 gene in esophageal carcinoma cells is controlled by Sp1 and AP-1 (c-Jun/c-Fos) binding to a minimal promoter region (-87/-32); these transcription factors bind their respective sites and are activated downstream of the MEK1/2-ERK1/2 signaling pathway.\",\n      \"method\": \"Luciferase reporter with deletion/site-directed mutants, EMSA, chromatin immunoprecipitation, pharmacological inhibitors\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (EMSA, ChIP, reporter assays, mutagenesis) in a single focused study establishing the promoter mechanism\",\n      \"pmids\": [\"19164283\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The histone methyltransferase SMYD3 directly binds to the EZR promoter region and stimulates EZR transcription; ChIP assay confirmed SMYD3 occupancy at the EZR promoter, and SMYD3 knockdown suppressed EZR expression, cell proliferation, migration, and invasion.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), RNAi knockdown, in vitro and in vivo functional assays\",\n      \"journal\": \"Human pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus functional phenotypic rescue in a single lab; replicated conceptually in PMID:29253179\",\n      \"pmids\": [\"26980013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Antisense lncRNA EZR-AS1 recruits SMYD3 to a GC-rich region downstream of the EZR promoter, causing H3K4me3 enrichment and enhanced EZR transcription; EZR-AS1 also forms a complex with RNA polymerase II to activate EZR transcription.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, RNA pulldown, reporter assays, in vivo xenograft\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (Co-IP, ChIP, reporter) in a single lab; note this paper is about the lncRNA regulating EZR transcription, not about EZR protein mechanism per se\",\n      \"pmids\": [\"29253179\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TPA (phorbol ester) induces over-expression of EZR/VIL2 variant 1 (but not variant 2) in ESCC cells via activation of MEK/ERK1/2 signaling, which increases c-Jun and Sp1 binding to the AP-1 and Sp1 composite TPA-responsive element in the VIL2 V1 promoter; MEK inhibitor U0126 blocks this induction, and ezrin silencing partially reverses TPA-promoted cell migration.\",\n      \"method\": \"Promoter-luciferase assays, ChIP, pharmacological inhibitors (U0126), siRNA knockdown, migration assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (reporter, ChIP, inhibitors, KD) in one lab; consistent with PMID:19164283 findings\",\n      \"pmids\": [\"25915860\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"A DNA enhancer element for the VIL2/EZR gene was mapped to the -1297/-1186 region upstream of the VIL2 promoter; this element functions in a position- and orientation-dependent manner to enhance VIL2 promoter activity in HEK-293 cells.\",\n      \"method\": \"Luciferase reporter assays with deletion constructs in transiently transfected HEK-293 cells\",\n      \"journal\": \"Cell biology international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — systematic deletion mapping with reporter assays, single lab, single method\",\n      \"pmids\": [\"21585339\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"EZR promotes pancreatic cancer cell proliferation, migration, and invasion via activation of the FAK/AKT signaling pathway; EZR knockdown suppressed these phenotypes and reduced FAK protein levels and downstream signaling.\",\n      \"method\": \"siRNA knockdown, Western blot, CCK-8 assay, Transwell assay\",\n      \"journal\": \"Cancer cell international\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, KD with phenotypic readout and Western blot for pathway, no direct biochemical interaction shown between EZR and FAK\",\n      \"pmids\": [\"34627255\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"EZR knockdown inhibited RhoA, Rac1, and Cdc42 activity in breast cancer cells, as confirmed by RhoA activation assays, placing EZR upstream of these small GTPases in regulating cancer cell migration and invasion.\",\n      \"method\": \"siRNA knockdown, RhoA/Rac1/Cdc42 activation (pulldown) assays, migration and invasion assays\",\n      \"journal\": \"Oncology research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, GTPase activation assays with KD, limited mechanistic detail on how EZR connects to Rho GTPases\",\n      \"pmids\": [\"37304008\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SIRT7, a desuccinylase, suppresses succinylation of EZR at the Lys60 site; SIRT7 knockdown promoted EZR succinylation at K60, and EZR overexpression induced higher melanin synthesis in melanocytes, whereas EZR knockdown blocked SIRT7-loss-induced melanin synthesis, placing EZR downstream of SIRT7-regulated succinylation in melanin biosynthesis.\",\n      \"method\": \"Co-immunoprecipitation, immunoprecipitation, Western blot, rescue experiments, tyrosinase activity assay, melanin content measurement\",\n      \"journal\": \"Clinical, cosmetic and investigational dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, IP, and functional rescue in single lab; identifies a specific PTM site (K60 succinylation) and its functional consequence\",\n      \"pmids\": [\"38933605\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Ezrin (Vil2) is required for proper bile duct fluidity and alkalinity regulation; ezrin-knockdown (Vil2kd/kd) mice exhibit severe hepatic injury resembling intrahepatic cholestatic disease, and UDCA treatment ameliorated hepatic function and fibrosis in these mice independently of biliary bicarbonate secretion.\",\n      \"method\": \"Vil2kd/kd knockdown mouse model, histology, liver function assays, gene expression analysis, in vitro cholangiocyte cytotoxicity\",\n      \"journal\": \"Biological & pharmaceutical bulletin\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — established genetic model with defined hepatic phenotype and mechanistic dissection of UDCA action; single lab\",\n      \"pmids\": [\"28049946\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"A missense variant (P471L) in EZR was identified in a family with congenital nuclear cataract; EZR knockout in zebrafish using TALENs caused developmental delays manifesting as multilayered lens epithelial cells with abnormal proliferation patterns, indicating ezrin is required for enucleation and differentiation of lens epithelial cells.\",\n      \"method\": \"Linkage analysis, whole-exome sequencing, TALEN-mediated zebrafish knockout, histology, immunohistochemistry\",\n      \"journal\": \"Ophthalmic genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo genetic model (zebrafish KO) with defined cellular phenotype plus human variant identification; single lab\",\n      \"pmids\": [\"38563525\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"EZR depletion in breast cancer cells suppressed STAT3 Tyr705 phosphorylation and downstream pro-survival signaling; STAT3 activation partially rescued EZR-loss phenotypes (reduced proliferation, migration, invasion, increased apoptosis), establishing that EZR sustains STAT3 signaling to drive metastatic competence and paclitaxel resistance.\",\n      \"method\": \"Stable EZR silencing (shRNA), phospho-kinase profiling, immunoblot, STAT3 activation rescue, orthotopic xenograft, lung colonization model, paclitaxel-resistant subline generation\",\n      \"journal\": \"Life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (KD, phospho-profiling, rescue, in vivo) in single lab; no direct biochemical interaction between EZR and STAT3 shown\",\n      \"pmids\": [\"41621788\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ERK phosphorylates the C-terminal tail of the Ezrin-activating kinase LOK, inhibiting LOK's activation of Ezrin in the cell body; this releases Ezrin's inhibition of Rho (via ARHGAP18 recruitment) and promotes stress fiber assembly for cell migration, establishing an ERK-LOK-Ezrin-ARHGAP18-Rho signaling cascade.\",\n      \"method\": \"Molecular perturbations, live-cell imaging, kinase activity assays, epistasis experiments in migrating cells\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple perturbations and epistasis in single preprint lab; mechanistic pathway placement is clear but awaits peer review\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PI(4,5)P2 binding to the Ezrin FERM domain (F1 and F3 subdomains) outcompetes other phospholipids and triggers a conformational rearrangement that destabilizes the FERM F2-CTD interface, enabling spontaneous dissociation of the non-phosphorylated C-terminal domain (CTD); T567 phosphorylation subsequently impedes FERM-CTD reassociation, stabilizing the open active conformation. EBP50 competes with the CTD for F2-F3 FERM binding after CTD dissociation.\",\n      \"method\": \"Enhanced sampling molecular dynamics (metadynamics), free energy calculations, contact-map collective variables, biochemical validation\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — rigorous computational (Tier 1 for structural mechanism) with biochemical validation in single preprint; awaits full peer-reviewed replication\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Both PC1 and PC2 polycystins co-immunoprecipitate Ezrin; acute loss of polycystins reduced Ezrin protein abundance and caused mis-localization of active Ezrin away from the apical surface in renal epithelial cells, and PKC inhibition phenocopied this loss, implicating the polycystin complex in regulating Ezrin phosphorylation and apical cell shape.\",\n      \"method\": \"Co-immunoprecipitation, inducible Pkd1/Pkd2 knockout, immunofluorescence, 3D tubuloid culture, pharmacological inhibitors (NSC668394, PKC inhibitor)\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — Co-IP plus KO localization data in single preprint; PKC link is pharmacological only\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Phactr4 loss leads to Ezrin hyperphosphorylation in macrophages, and ezrin inhibition reverses the membrane protrusion defects caused by Phactr4 knockdown, placing Ezrin downstream of the PP1-Phactr4 phosphatase axis in controlling lamellipodial dynamics and macrophage migration.\",\n      \"method\": \"siRNA knockdown, pharmacological ezrin inhibition, live-cell imaging, epistasis experiments\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — genetic/pharmacological epistasis in single preprint, single lab\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In bleb-based migration of metastatic melanoma cells under confinement, CD44 and ERM proteins (including Ezrin) restrict EGFR mobility within a membrane-apposed cortical actin meshwork at the bleb rear, establishing a rear-to-front EGFR-PI3K-Rac1 activity gradient required for bleb stability and polarized migration.\",\n      \"method\": \"High-resolution time-lapse imaging, protein activity biosensors, optogenetics, specific molecular perturbations\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — live imaging and perturbations in single preprint; ERM contribution not distinguished from other ERM family members\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Erbin physically interacts with NHERF1, Ezrin, and HER2 in actin-rich membrane protrusions of HER2-positive breast cancer cells; Erbin knockdown disrupted the HER2/NHERF1/Ezrin/HSP90 protein complex, reducing HER2 signaling, and inhibition of Ezrin disrupted Erbin's ability to interact with HER2, establishing Ezrin as a scaffold component of this signaling complex.\",\n      \"method\": \"Co-immunoprecipitation, knockdown, immunofluorescence in SKBR3 cells and MMTV-Neu mammary glands\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — reciprocal Co-IP in single preprint, single lab; awaits peer review\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Integrin beta 4 (ITGB4) directly interacts with Ezrin (EZR) as confirmed by co-immunoprecipitation and co-immunofluorescence; ITGB4 knockdown decreased EZR expression at both mRNA and protein levels, and EZR overexpression rescued the pro-tumorigenic phenotypes suppressed by ITGB4 silencing, establishing ITGB4 as an upstream regulator of EZR that activates Wnt/β-catenin signaling in colorectal cancer.\",\n      \"method\": \"Co-immunoprecipitation, co-immunofluorescence, RNA-seq, Western blot, functional rescue assays, xenograft model\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — Co-IP and rescue in single preprint; awaits peer review\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PI(4,5)P2 asymmetrically incorporated into supported lipid bilayers retains functionality and recruits ezrin to the membrane, demonstrating that ezrin binding to PI(4,5)P2 is sufficient for membrane recruitment in a reconstituted system.\",\n      \"method\": \"Supported lipid bilayer reconstitution, FRAP, fluorescence microscopy\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro reconstitution in single preprint; establishes PI(4,5)P2-dependent membrane recruitment but is a methods-focused paper\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Inhibition of ezrin phosphorylation (using small molecule inhibitors) reduced mechano-protection of cells against hypo-osmotic shock by weakening cortical actin contractility and shifting actin organization from the cortex to stress fibers via formin-mediated actin polymerization; formin inhibition (SMIFH2) prevented this stress fiber increase and blocked the subsequent increase in cell rupture rates.\",\n      \"method\": \"Small molecule ezrin inhibitors, formin inhibitor (SMIFH2), hypo-osmotic shock assay, live-cell imaging, traction force measurements\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — pharmacological inhibitors and epistasis in single preprint, CHO cells\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SLK and Ezrin both significantly influence actin cytoskeleton architecture; differential effects were observed between protein knockdown and dephosphorylation, suggesting phosphorylation-independent roles for Ezrin in modulating actin dynamics beyond its canonical activation by T567 phosphorylation.\",\n      \"method\": \"siRNA knockdown, pharmacological inhibitors, actin structure imaging in HaCaT cells\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single preprint, single lab, pharmacological/KD approach without direct biochemical mechanism identified\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2028,\n      \"finding\": \"FOXF2 transcription factor directly interacts with EZR and inhibits EZR transcriptional expression; FOXF2 knockdown enhanced ESCC cell growth and metastasis in vitro and in vivo, and suppression of ERBB2 signaling function was shown to be downstream of EZR regulation by FOXF2.\",\n      \"method\": \"Western blot, qRT-PCR, plasmid transfection, lentiviral infection, co-IP (implied by 'directly interacted'), migration/invasion assay, xenograft model\",\n      \"journal\": \"Translational cancer research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single paper; 'direct interaction' claim relies on computational and expression data with limited biochemical validation per abstract\",\n      \"pmids\": [\"39816549\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"EZR (ezrin) is a membrane-cytoskeletal linker protein whose transcription is regulated by Sp1/AP-1 transcription factors downstream of MEK/ERK signaling and by epigenetic mechanisms involving SMYD3-mediated H3K4 methylation; the protein is activated through a two-step mechanism in which FERM-domain binding to PI(4,5)P2 triggers spontaneous CTD dissociation and T567 phosphorylation (by kinases including PKCα and LOK) stabilizes the open conformation, enabling actin engagement; active EZR links the plasma membrane to cortical actin to regulate cell shape, migration, and mechano-protection, and acts as a signaling scaffold that modulates RhoA/Rac1/Cdc42 GTPase activity (partly via ARHGAP18), FAK/AKT, STAT3, and Wnt/β-catenin pathways; additionally, EZR succinylation at K60 is regulated by the desuccinylase SIRT7 to control melanin synthesis, and ezrin is required for bile duct function and lens epithelial cell differentiation in vivo.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"EZR (ezrin) is a membrane–cytoskeletal linker and signaling scaffold whose activation couples plasma-membrane lipid cues to cortical actin organization, cell shape, and motility [#13, #20]. The protein is held in a closed autoinhibited state by an intramolecular FERM–C-terminal domain (CTD) interface; PI(4,5)P2 binding to the F1/F3 FERM subdomains outcompetes other phospholipids and destabilizes the F2–CTD interface, allowing spontaneous CTD dissociation, after which Thr567 phosphorylation prevents reassociation and locks the open active conformation, while EBP50 competes for the freed F2–F3 surface [#13]. PI(4,5)P2 binding alone is sufficient to recruit ezrin to membranes [#19]. T567 phosphorylation is driven by upstream kinases including PKCα within a hypoxia–autophagy axis [#0] and by LOK, which is itself restrained by ERK; this ERK–LOK–ezrin module controls Rho activity through ARHGAP18 recruitment and governs stress-fiber assembly during migration [#12]. Active ezrin sustains cortical actin contractility and protects cells against osmotic rupture, with its inhibition redirecting actin from the cortex to formin-dependent stress fibers [#20]. EZR expression is transcriptionally controlled by Sp1 and AP-1 (c-Jun/c-Fos) acting downstream of MEK/ERK signaling [#1, #4] and by epigenetic activation through SMYD3-mediated H3K4 methylation [#2]. In cancer cells, ezrin acts upstream of RhoA/Rac1/Cdc42 GTPases and sustains FAK/AKT and STAT3 signaling to promote proliferation, migration, invasion, and therapy resistance [#7, #6, #11]. A specific PTM, K60 succinylation reversed by the desuccinylase SIRT7, links ezrin to melanin synthesis [#8]. In vivo, ezrin is required for bile duct fluid regulation, and loss produces cholestatic hepatic injury [#9], and a missense EZR variant with zebrafish knockout data implicates ezrin in lens epithelial cell differentiation in congenital cataract [#10].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Established how EZR transcription is controlled, identifying the cis-elements and transcription factors that set ezrin expression levels.\",\n      \"evidence\": \"Promoter deletion/mutation luciferase reporters, EMSA, and ChIP in esophageal carcinoma cells mapping Sp1/AP-1 binding downstream of MEK-ERK\",\n      \"pmids\": [\"19164283\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not address ezrin protein activation or function\", \"Promoter behavior characterized in a single cancer cell context\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Extended transcriptional regulation by mapping a distal enhancer element governing VIL2/EZR promoter activity.\",\n      \"evidence\": \"Deletion-construct luciferase reporters in HEK-293 cells\",\n      \"pmids\": [\"21585339\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Trans-acting factors binding the enhancer not identified\", \"Single method, single cell line\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Connected an extracellular stimulus (phorbol ester) to isoform-specific EZR induction through MEK/ERK-driven Sp1/AP-1 occupancy of the V1 promoter.\",\n      \"evidence\": \"Promoter-luciferase, ChIP, U0126 inhibition, and siRNA migration assays in ESCC cells\",\n      \"pmids\": [\"25915860\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not resolve why variant 2 is unresponsive\", \"Functional rescue of migration only partial\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified an epigenetic input to EZR expression, showing SMYD3 occupies the EZR promoter to stimulate transcription.\",\n      \"evidence\": \"ChIP, RNAi knockdown, and in vitro/in vivo functional assays\",\n      \"pmids\": [\"26980013\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not define the chromatin mark deposited\", \"Mechanism of SMYD3 recruitment unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrated an in vivo physiological requirement for ezrin in bile duct function, beyond its cancer-cell roles.\",\n      \"evidence\": \"Vil2kd/kd knockdown mouse model with histology, liver function assays, and UDCA treatment\",\n      \"pmids\": [\"28049946\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular link between ezrin and biliary fluid regulation not defined\", \"Single model system\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Resolved how SMYD3 is targeted to EZR, showing antisense lncRNA EZR-AS1 recruits SMYD3 to deposit H3K4me3 and engages RNA Pol II.\",\n      \"evidence\": \"Co-IP, ChIP, RNA pulldown, reporter assays, and xenografts\",\n      \"pmids\": [\"29253179\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Concerns transcriptional regulation, not ezrin protein mechanism\", \"Single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Placed ezrin T567 phosphorylation within a hypoxia–autophagy–PKCα signaling axis controlling tumor-initiating cell self-renewal.\",\n      \"evidence\": \"Autophagy-gene and kinase knockdown, pharmacological inhibition, phospho-immunostaining, and in vivo tumor initiation\",\n      \"pmids\": [\"31775562\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No in vitro reconstitution of PKCα–ezrin kinase-substrate relationship\", \"How autophagy couples to PKCα activation unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Linked ezrin to FAK/AKT signaling as a driver of pancreatic cancer proliferation and invasion.\",\n      \"evidence\": \"siRNA knockdown, Western blot, proliferation and Transwell assays\",\n      \"pmids\": [\"34627255\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No direct biochemical interaction between EZR and FAK shown\", \"Single lab phenotypic readout\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Positioned ezrin upstream of Rho-family GTPases in cancer cell motility.\",\n      \"evidence\": \"siRNA knockdown with RhoA/Rac1/Cdc42 activation pulldown and migration/invasion assays\",\n      \"pmids\": [\"37304008\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Mechanism connecting ezrin to GTPase activation not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified K60 succinylation as a SIRT7-regulated PTM coupling ezrin to melanin biosynthesis, broadening ezrin regulation beyond T567 phosphorylation.\",\n      \"evidence\": \"Co-IP, IP, Western blot, rescue, and tyrosinase/melanin assays in melanocytes\",\n      \"pmids\": [\"38933605\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural/functional consequence of K60 succinylation on ezrin conformation unknown\", \"Succinyltransferase not identified\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Implicated ezrin in lens epithelial differentiation, linking a human EZR missense variant to congenital cataract.\",\n      \"evidence\": \"Linkage analysis, whole-exome sequencing, and TALEN-mediated zebrafish knockout with histology\",\n      \"pmids\": [\"38563525\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional impact of the P471L variant on ezrin activity not assayed\", \"Single family\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined the structural-mechanistic basis of ezrin activation, showing PI(4,5)P2 binding triggers CTD dissociation that T567 phosphorylation then stabilizes.\",\n      \"evidence\": \"Enhanced-sampling molecular dynamics, free-energy calculations, and biochemical validation (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Computational model awaits full peer-reviewed experimental confirmation\", \"EBP50 competition step inferred from simulation\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established an ERK–LOK–ezrin–ARHGAP18–Rho cascade controlling stress-fiber assembly and directed migration.\",\n      \"evidence\": \"Molecular perturbations, live-cell imaging, kinase assays, and epistasis in migrating cells (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Awaits peer review\", \"Quantitative contribution of LOK versus other ezrin kinases unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrated ezrin's role in cortical mechano-protection, where its activity maintains cortical contractility against osmotic rupture.\",\n      \"evidence\": \"Ezrin and formin small-molecule inhibitors, hypo-osmotic shock, live imaging, and traction force in CHO cells (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single preprint, pharmacological approach\", \"Direct ezrin–formin relationship not biochemically defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the lipid-triggered structural activation, the multiple PTMs (T567 phosphorylation, K60 succinylation), and the diverse downstream effectors (Rho GTPases, FAK/AKT, STAT3, Wnt/β-catenin) are integrated into context-specific ezrin functions in vivo remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unified model linking activation state to specific effector engagement\", \"Most cancer-pathway links lack direct ezrin–effector biochemistry\", \"Several key mechanisms exist only as preprints\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [13, 20]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [13, 19]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [13, 19, 14]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [20, 21]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [12, 7]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 2, 4]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"PRKCA\", \"SLK\", \"ARHGAP18\", \"EBP50\", \"NHERF1\", \"ITGB4\", \"FOXF2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":{"gene":"EZR","tier":"GROUNDING","verdict":"Evidence-grounding concern","subtype":"uncited_synthesis","uniprot_band":"medium","rules_fired":"R8","issue":"R8: 3/8 claims uncited (38%)"},"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":5,"faith_pct":80.0}}