{"gene":"PDLIM5","run_date":"2026-06-10T05:19:53","timeline":{"discoveries":[{"year":2003,"finding":"PDLIM5/ENH forms a macromolecular complex with PKCε and N-type Ca2+ channels. ENH acts as an adaptor protein that bridges PKCε to N-type Ca2+ channels, enabling selective PKC-mediated potentiation of channel activity in neurons.","method":"Co-immunoprecipitation, pulldown assays, electrophysiology, disruption of complex by competing peptides","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — reciprocal co-IP, functional reconstitution in neurons with peptide disruption, replicated in follow-up study (PMID:15979848)","pmids":["12665800"],"is_preprint":false},{"year":2005,"finding":"The second LIM domain of PDLIM5/ENH is primarily responsible for Ca2+-dependent binding to both the N-type Ca2+ channel C-terminus and PKCε. Increased Ca2+ enhances ENH binding to the channel but promotes dissociation of PKCε from ENH. ENH exists as a dimer in vivo, and PKCε translocation inhibition peptide blocks the PKCε-ENH interaction.","method":"Mutagenesis of LIM domains, in vitro binding assays with varying Ca2+ concentrations, co-immunoprecipitation","journal":"Cellular signalling","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis combined with biochemical binding assays in single rigorous study with multiple orthogonal methods","pmids":["15979848"],"is_preprint":false},{"year":2000,"finding":"PDLIM5/ENH (mENH1) co-localizes with α-actinin at the Z-disk of rat neonatal cardiomyocytes. The PDZ domain of ENH directly interacts with actin and α-actinin, identified by GST pulldown assays. Alternative splicing produces shorter isoforms (ENH2, ENH3) lacking LIM domains that may negatively modulate the scaffolding activity of ENH1.","method":"Immunofluorescence co-localization in cardiomyocytes, GST pulldown assays, cDNA cloning and Northern blot","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct pulldown with recombinant protein plus co-localization imaging in relevant cell type, single lab with two orthogonal methods","pmids":["10833443"],"is_preprint":false},{"year":2006,"finding":"PDLIM5/ENH acts as a cytoplasmic sequestration factor for Id2 in neurons. The three LIM domains of ENH bind to the helix-loop-helix domain of Id2 in vitro and in vivo. ENH up-regulation during neural differentiation promotes cytoplasmic translocation of Id2, inactivating its transcriptional and cell-cycle-promoting functions. Silencing ENH by RNAi prevents cytoplasmic relocation of Id2 in retinoic acid-differentiated neuroblastoma cells.","method":"Co-immunoprecipitation, GST pulldown, RNAi knockdown, immunofluorescence localization, overexpression in neuroblastoma cells","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, in vitro pulldown, RNAi rescue, immunofluorescence, and gain/loss-of-function in same study","pmids":["16549780"],"is_preprint":false},{"year":2009,"finding":"PDLIM5 is present in the postsynaptic density of dendritic spines and interacts with SPAR (Spine-Associated RapGAP). Overexpression of PDLIM5 promotes decreased spine head size and longer filopodia-like morphology; RNAi knockdown or disruption of PDLIM5-SPAR interaction causes increased spine head diameter. PKC activation promotes delivery of PDLIM5 into dendritic spines.","method":"Co-immunoprecipitation, immunofluorescence, RNAi knockdown, overexpression, morphometric analysis of dendritic spines","journal":"Molecular and cellular neurosciences","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, RNAi loss-of-function with morphometric readout, PKC activation experiment, multiple orthogonal methods in single study","pmids":["19900557"],"is_preprint":false},{"year":2015,"finding":"AMPK directly phosphorylates PDLIM5 at Ser177. Phosphomimetic S177D-PDLIM5 inhibits cell migration, attenuates lamellipodia formation, suppresses Rac1 activity at the cell periphery, and displaces the Arp2/3 complex from the leading edge. S177D-PDLIM5 also attenuates association with Rac1-specific guanine nucleotide exchange factors at the cell periphery.","method":"In vitro kinase assay, phosphomimetic/phospho-deficient mutant expression, cell migration assays, immunofluorescence, Rac1 activity assay (pull-down), proximity assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay confirming direct phosphorylation, multiple functional readouts with phosphomimetic mutants, mechanistic pathway placed via Rac1-Arp2/3","pmids":["25635515"],"is_preprint":false},{"year":2020,"finding":"PDLIM5 interacts directly with SMAD3 (but not SMAD2) and competitively suppresses the interaction between SMAD3 and its E3 ubiquitin ligase STUB1, thereby protecting SMAD3 from STUB1-mediated proteasomal degradation. PDLIM5 knockdown reduces SMAD3 protein levels and impairs TGFβ signaling and TGFβ-induced EMT in NSCLC cells; STUB1 knockdown restores SMAD3 levels and migration in PDLIM5-knockdown cells.","method":"Co-immunoprecipitation, competitive binding assay, shRNA knockdown, overexpression rescue, proteasome inhibitor treatment, cell migration and invasion assays, in vivo metastasis model","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP for protein interactions, competitive binding, RNAi epistasis, multiple orthogonal functional readouts in single rigorous study","pmids":["32737199"],"is_preprint":false},{"year":2021,"finding":"Metformin activates the AMPK-Pdlim5 pathway to inhibit vascular smooth muscle cell (VSMC) migration. Expression of phosphomimetic S177D-Pdlim5 inhibits lamellipodia formation and migration in VSMCs; the phospho-abolished S177A-Pdlim5 mutant undermines metformin's protective effects on neointima formation and diabetes-accelerated atherosclerosis in vivo.","method":"Exogenous expression of phosphomimetic/unphosphorylatable Pdlim5 mutants in VSMC line, adenovirus-mediated expression in ApoE-/- mice, wire-injury carotid artery model, Myh11-cre-EGFP lineage tracing","journal":"Frontiers in cardiovascular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo genetic validation with mutant Pdlim5 rescues, but mainly replicates AMPK phosphorylation finding from PMID:25635515; single lab","pmids":["34368251"],"is_preprint":false},{"year":2016,"finding":"RBM20 and RBM24 cooperatively promote expression of short ENH (PDLIM5) splice variants (including ENH3) by binding the 5' intronic region of exon 11. In healthy conditions, these splicing factors maintain expression of short ENH isoforms; hypertrophic stimulations repress RBM20/RBM24 expression, shifting toward long isoforms (ENH1) that promote hypertrophic growth.","method":"RNA binding assays (RIP), overexpression of RBM20/RBM24, alternative splicing analysis, RT-PCR isoform quantification","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA binding demonstrated, functional consequence on isoform balance shown, single lab with two orthogonal methods","pmids":["27289039"],"is_preprint":false},{"year":2017,"finding":"PDLIM5 binds to AMPK and affects its activation and degradation in prostate cancer cells. Knockdown of PDLIM5 inhibits cell proliferation, induces G2/M arrest, and inhibits migration and invasion by reversing the mesenchymal phenotype.","method":"Co-immunoprecipitation, lentiviral shRNA knockdown, cell cycle analysis, migration/invasion assays, xenograft model","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — co-IP for AMPK binding, RNAi with defined cellular phenotypes, single lab; mechanism of AMPK regulation by PDLIM5 not fully resolved","pmids":["29228678"],"is_preprint":false},{"year":2013,"finding":"Reduced PDLIM5 levels in Pdlim5 heterozygous knockout mice attenuate methamphetamine-induced locomotor hyperactivity and prepulse inhibition impairment, and increase immobility in forced swimming test (reversed by imipramine). Homozygous knockout of Pdlim5 is embryonic lethal. Transient inhibition of PDLIM5 via PKCε translocation block phenocopies the heterozygous effect.","method":"Pdlim5 hetero KO mouse model, behavioral testing (locomotor activity, prepulse inhibition, forced swim), pharmacological intervention","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with defined behavioral phenotypes, pharmacological validation; molecular mechanism of PDLIM5 in CNS not resolved at biochemical level","pmids":["23593136"],"is_preprint":false},{"year":1999,"finding":"Human PDLIM5/ENH is expressed as two major mRNA isoforms: a 1.9 kb transcript predominantly in heart and skeletal muscle, and a 5.6 kb transcript ubiquitously expressed in human tissues. The protein shares 88% identity with rat ENH and is located on chromosome 4q22.","method":"Northern blot, cDNA cloning, radiation hybrid mapping, chromosomal localization by PCR","journal":"Journal of human genetics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — characterization of expression and chromosomal location; no direct mechanistic experiment on protein function","pmids":["10429367"],"is_preprint":false},{"year":2018,"finding":"During human pluripotent stem cell cardiomyogenesis, PDLIM5 is strongly up-regulated, and novel stage-specific isoforms (53 kDa isoforms b and g, corresponding to transcript variants 2 and 7) emerge simultaneously with onset of early cardiac transcription factor NKX2.5 expression.","method":"SILAC-based quantitative proteomics, shotgun proteomics, isoform identification during cardiomyogenesis stages","journal":"Journal of proteome research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — proteomic identification of novel isoforms during differentiation; no direct functional experiment on PDLIM5 mechanism","pmids":["28139119"],"is_preprint":false},{"year":2018,"finding":"PDLIM5 knockdown in papillary thyroid carcinoma cells inhibits migration, invasion, and proliferation. PDLIM5 knockdown reduces Ras and Phospho-ERK1/2 expression, suggesting PDLIM5 promotes PTC via activation of the Ras-ERK pathway.","method":"shRNA knockdown, migration/invasion assays, Western blot for Ras and p-ERK1/2","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, loss-of-function with pathway marker readout but no direct binding or mechanistic experiment linking PDLIM5 to Ras-ERK","pmids":["29574154"],"is_preprint":false}],"current_model":"PDLIM5 (ENH) is a cytoplasmic scaffold/adaptor protein with an N-terminal PDZ domain (binding α-actinin, actin, and cytoskeletal components at the Z-disk) and three C-terminal LIM domains (mediating interactions with PKCε, N-type Ca²⁺ channels, Id2, and SMAD3); it forms a PKCε–ENH–N-type Ca²⁺ channel ternary complex to facilitate specific PKC signaling at neuronal synapses, sequesters Id2 in the cytoplasm to regulate neural differentiation, protects SMAD3 from STUB1-mediated proteasomal degradation to sustain TGFβ signaling, is directly phosphorylated by AMPK at Ser177 to inhibit Rac1-Arp2/3-dependent cell migration, and regulates dendritic spine morphology by interacting with SPAR at the postsynaptic density."},"narrative":{"mechanistic_narrative":"PDLIM5 (ENH) is a cytoplasmic PDZ-LIM scaffold/adaptor protein that organizes signaling at the cytoskeleton and synapse and tunes multiple signal transduction outputs [PMID:12665800, PMID:10833443]. Through its PDZ domain it binds actin and α-actinin and co-localizes with α-actinin at the cardiomyocyte Z-disk, anchoring it to the actin cytoskeleton [PMID:10833443]. Its three C-terminal LIM domains mediate the protein-protein interactions that define its signaling roles: the second LIM domain assembles a Ca²⁺-dependent PKCε–ENH–N-type Ca²⁺ channel ternary complex that enables selective PKC-mediated potentiation of channel activity in neurons, with rising Ca²⁺ strengthening channel binding while dissociating PKCε [PMID:12665800, PMID:15979848]. The LIM domains also bind the helix-loop-helix region of Id2, sequestering it in the cytoplasm during neural differentiation to inactivate its transcriptional and cell-cycle functions [PMID:16549780]. At the postsynaptic density PDLIM5 interacts with SPAR to control dendritic spine morphology, and PKC activation drives its delivery into spines [PMID:19900557]. PDLIM5 is a direct AMPK substrate: phosphorylation at Ser177 suppresses peripheral Rac1 activity, displaces the Arp2/3 complex from the leading edge, and inhibits lamellipodia formation and cell migration, a brake that operates in vascular smooth muscle cells downstream of metformin-AMPK signaling [PMID:25635515, PMID:34368251]. In carcinoma contexts it stabilizes TGFβ signaling by binding SMAD3 and competitively blocking its STUB1-mediated proteasomal degradation, thereby sustaining TGFβ-induced EMT [PMID:32737199]. Pdlim5 is required for development, as homozygous knockout is embryonic lethal, and reduced dosage produces neurobehavioral phenotypes [PMID:23593136].","teleology":[{"year":2000,"claim":"Established the cytoskeletal anchoring function of PDLIM5 by showing its PDZ domain links it to the actin/α-actinin Z-disk, defining it as a structural scaffold.","evidence":"GST pulldown and immunofluorescence co-localization in rat neonatal cardiomyocytes, plus identification of LIM-less splice isoforms","pmids":["10833443"],"confidence":"High","gaps":["Functional role of the negatively-modulating short isoforms not tested","Does not address signaling outputs of the LIM domains"]},{"year":2003,"claim":"Answered how PKCε achieves substrate selectivity at neuronal channels by showing ENH acts as an adaptor bridging PKCε to N-type Ca²⁺ channels for selective channel potentiation.","evidence":"Reciprocal co-IP, pulldowns, electrophysiology, and peptide-mediated complex disruption in neurons","pmids":["12665800"],"confidence":"High","gaps":["Which LIM domain mediates the interaction not yet resolved","Physiological/behavioral consequence of channel potentiation untested"]},{"year":2005,"claim":"Refined the ternary complex mechanism by mapping the second LIM domain as the Ca²⁺-dependent binding module and revealing opposing Ca²⁺ effects on channel vs PKCε binding.","evidence":"LIM-domain mutagenesis, Ca²⁺-titrated in vitro binding, co-IP, and demonstration of ENH dimerization","pmids":["15979848"],"confidence":"High","gaps":["Structural basis of Ca²‚ sensing not determined","Role of dimerization in complex assembly unclear"]},{"year":2006,"claim":"Showed PDLIM5 controls neural differentiation non-structurally by using its LIM domains to sequester Id2 in the cytoplasm, inactivating its nuclear functions.","evidence":"Co-IP, GST pulldown, RNAi rescue, and immunofluorescence in retinoic-acid-differentiated neuroblastoma cells","pmids":["16549780"],"confidence":"High","gaps":["Whether other HLH/Id proteins are similarly sequestered untested","Link to downstream cell-cycle targets indirect"]},{"year":2009,"claim":"Placed PDLIM5 at the postsynaptic density as a regulator of dendritic spine shape via SPAR, with PKC controlling its synaptic delivery.","evidence":"Co-IP, RNAi, overexpression, interaction disruption, and spine morphometry in neurons","pmids":["19900557"],"confidence":"High","gaps":["Molecular link between SPAR binding and actin remodeling not defined","Whether spine effects require the PKCε/channel complex unknown"]},{"year":2013,"claim":"Provided in vivo evidence that PDLIM5 dosage is essential for development and modulates neurobehavioral phenotypes, connecting its PKCε scaffold role to CNS function.","evidence":"Pdlim5 heterozygous/homozygous knockout mice, behavioral assays, and PKCε translocation-block phenocopy","pmids":["23593136"],"confidence":"Medium","gaps":["Biochemical mechanism underlying behavioral effects not resolved","Embryonic lethal cause of homozygous KO not characterized"]},{"year":2015,"claim":"Identified PDLIM5 as a direct AMPK substrate and defined a phosphorylation switch (Ser177) that brakes cell migration through Rac1-Arp2/3 suppression.","evidence":"In vitro kinase assay, phosphomimetic/phospho-dead mutants, migration and Rac1 pulldown assays, and immunofluorescence","pmids":["25635515"],"confidence":"High","gaps":["How phospho-Ser177 disrupts Rac-GEF association mechanistically unclear","Relationship to the cytoskeletal scaffold function not integrated"]},{"year":2017,"claim":"Suggested a reciprocal relationship in which PDLIM5 binds AMPK and influences its activation/degradation, with knockdown suppressing prostate cancer proliferation and invasion.","evidence":"Co-IP, shRNA knockdown, cell-cycle and invasion assays, and xenograft in prostate cancer cells","pmids":["29228678"],"confidence":"Medium","gaps":["Mechanism of AMPK regulation by PDLIM5 not resolved","Single lab; binding not mapped to specific domains"]},{"year":2020,"claim":"Defined a TGFβ-pathway function by showing PDLIM5 binds SMAD3 and competitively protects it from STUB1-mediated degradation to sustain signaling and EMT.","evidence":"Reciprocal co-IP, competitive binding, shRNA epistasis with STUB1, proteasome inhibition, migration/invasion, and in vivo metastasis in NSCLC","pmids":["32737199"],"confidence":"High","gaps":["Domain mediating SMAD3 binding not mapped","Why SMAD2 is excluded not explained"]},{"year":2021,"claim":"Validated the AMPK-PDLIM5 migration brake in vivo, showing the Ser177 phospho-switch mediates metformin's protection against neointima and atherosclerosis.","evidence":"Phosphomimetic/unphosphorylatable Pdlim5 mutant expression, adenoviral delivery in ApoE-/- mice, wire-injury model, and lineage tracing in VSMCs","pmids":["34368251"],"confidence":"Medium","gaps":["Largely replicates the 2015 phosphorylation mechanism","Endogenous regulation of Ser177 in vivo not directly measured"]},{"year":null,"claim":"How PDLIM5's distinct scaffold functions (cytoskeletal anchoring, PKCε/channel signaling, Id2 sequestration, SMAD3 stabilization, AMPK-Rac1 migration control) are coordinated within a cell, and how isoform composition selects among them, remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model integrating PDZ and LIM functions","Isoform-specific functional assignment incomplete","Tissue-specific partner selection mechanism unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,3,4,6]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[2]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,6]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3,6]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[2]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[5]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,5,6]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[0,4]}],"complexes":["PKCε–ENH–N-type Ca²⁺ channel ternary complex"],"partners":["PRKCE","ACTN","ID2","SPAR","SMAD3","STUB1","PRKAA1","ACTB"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96HC4","full_name":"PDZ and LIM domain protein 5","aliases":["Enigma homolog","Enigma-like PDZ and LIM domains protein"],"length_aa":596,"mass_kda":63.9,"function":"May play an important role in the heart development by scaffolding PKC to the Z-disk region. May play a role in the regulation of cardiomyocyte expansion. Isoforms lacking the LIM domains may negatively modulate the scaffolding activity of isoform 1. Overexpression promotes the development of heart hypertrophy. Contributes to the regulation of dendritic spine morphogenesis in neurons. May be required to restrain postsynaptic growth of excitatory synapses. Isoform 1, but not isoform 2, expression favors spine thinning and elongation","subcellular_location":"Postsynaptic density; Presynapse; Postsynapse; Cytoplasm, cytosol","url":"https://www.uniprot.org/uniprotkb/Q96HC4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PDLIM5","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/PDLIM5","total_profiled":1310},"omim":[{"mim_id":"605904","title":"PDZ AND LIM DOMAIN PROTEIN 5; PDLIM5","url":"https://www.omim.org/entry/605904"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"},{"location":"Focal adhesion sites","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"heart muscle","ntpm":589.2},{"tissue":"skeletal muscle","ntpm":1089.9},{"tissue":"tongue","ntpm":538.0}],"url":"https://www.proteinatlas.org/search/PDLIM5"},"hgnc":{"alias_symbol":["LIM","Enh"],"prev_symbol":[]},"alphafold":{"accession":"Q96HC4","domains":[{"cath_id":"2.30.42.10","chopping":"2-84","consensus_level":"medium","plddt":93.0201,"start":2,"end":84},{"cath_id":"2.10.110.10","chopping":"419-476","consensus_level":"medium","plddt":91.5098,"start":419,"end":476},{"cath_id":"2.10.110.10","chopping":"477-535","consensus_level":"medium","plddt":92.6095,"start":477,"end":535},{"cath_id":"2.10.110.10","chopping":"536-596","consensus_level":"medium","plddt":88.7792,"start":536,"end":596}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96HC4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96HC4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96HC4-F1-predicted_aligned_error_v6.png","plddt_mean":64.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PDLIM5","jax_strain_url":"https://www.jax.org/strain/search?query=PDLIM5"},"sequence":{"accession":"Q96HC4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96HC4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96HC4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96HC4"}},"corpus_meta":[{"pmid":"15520811","id":"PMC_15520811","title":"The LIM domain: from the cytoskeleton to the nucleus.","date":"2004","source":"Nature reviews. 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ENH acts as an adaptor protein that bridges PKCε to N-type Ca2+ channels, enabling selective PKC-mediated potentiation of channel activity in neurons.\",\n      \"method\": \"Co-immunoprecipitation, pulldown assays, electrophysiology, disruption of complex by competing peptides\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — reciprocal co-IP, functional reconstitution in neurons with peptide disruption, replicated in follow-up study (PMID:15979848)\",\n      \"pmids\": [\"12665800\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The second LIM domain of PDLIM5/ENH is primarily responsible for Ca2+-dependent binding to both the N-type Ca2+ channel C-terminus and PKCε. Increased Ca2+ enhances ENH binding to the channel but promotes dissociation of PKCε from ENH. ENH exists as a dimer in vivo, and PKCε translocation inhibition peptide blocks the PKCε-ENH interaction.\",\n      \"method\": \"Mutagenesis of LIM domains, in vitro binding assays with varying Ca2+ concentrations, co-immunoprecipitation\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis combined with biochemical binding assays in single rigorous study with multiple orthogonal methods\",\n      \"pmids\": [\"15979848\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"PDLIM5/ENH (mENH1) co-localizes with α-actinin at the Z-disk of rat neonatal cardiomyocytes. The PDZ domain of ENH directly interacts with actin and α-actinin, identified by GST pulldown assays. Alternative splicing produces shorter isoforms (ENH2, ENH3) lacking LIM domains that may negatively modulate the scaffolding activity of ENH1.\",\n      \"method\": \"Immunofluorescence co-localization in cardiomyocytes, GST pulldown assays, cDNA cloning and Northern blot\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct pulldown with recombinant protein plus co-localization imaging in relevant cell type, single lab with two orthogonal methods\",\n      \"pmids\": [\"10833443\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"PDLIM5/ENH acts as a cytoplasmic sequestration factor for Id2 in neurons. The three LIM domains of ENH bind to the helix-loop-helix domain of Id2 in vitro and in vivo. ENH up-regulation during neural differentiation promotes cytoplasmic translocation of Id2, inactivating its transcriptional and cell-cycle-promoting functions. Silencing ENH by RNAi prevents cytoplasmic relocation of Id2 in retinoic acid-differentiated neuroblastoma cells.\",\n      \"method\": \"Co-immunoprecipitation, GST pulldown, RNAi knockdown, immunofluorescence localization, overexpression in neuroblastoma cells\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, in vitro pulldown, RNAi rescue, immunofluorescence, and gain/loss-of-function in same study\",\n      \"pmids\": [\"16549780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PDLIM5 is present in the postsynaptic density of dendritic spines and interacts with SPAR (Spine-Associated RapGAP). Overexpression of PDLIM5 promotes decreased spine head size and longer filopodia-like morphology; RNAi knockdown or disruption of PDLIM5-SPAR interaction causes increased spine head diameter. PKC activation promotes delivery of PDLIM5 into dendritic spines.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, RNAi knockdown, overexpression, morphometric analysis of dendritic spines\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, RNAi loss-of-function with morphometric readout, PKC activation experiment, multiple orthogonal methods in single study\",\n      \"pmids\": [\"19900557\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"AMPK directly phosphorylates PDLIM5 at Ser177. Phosphomimetic S177D-PDLIM5 inhibits cell migration, attenuates lamellipodia formation, suppresses Rac1 activity at the cell periphery, and displaces the Arp2/3 complex from the leading edge. S177D-PDLIM5 also attenuates association with Rac1-specific guanine nucleotide exchange factors at the cell periphery.\",\n      \"method\": \"In vitro kinase assay, phosphomimetic/phospho-deficient mutant expression, cell migration assays, immunofluorescence, Rac1 activity assay (pull-down), proximity assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay confirming direct phosphorylation, multiple functional readouts with phosphomimetic mutants, mechanistic pathway placed via Rac1-Arp2/3\",\n      \"pmids\": [\"25635515\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PDLIM5 interacts directly with SMAD3 (but not SMAD2) and competitively suppresses the interaction between SMAD3 and its E3 ubiquitin ligase STUB1, thereby protecting SMAD3 from STUB1-mediated proteasomal degradation. PDLIM5 knockdown reduces SMAD3 protein levels and impairs TGFβ signaling and TGFβ-induced EMT in NSCLC cells; STUB1 knockdown restores SMAD3 levels and migration in PDLIM5-knockdown cells.\",\n      \"method\": \"Co-immunoprecipitation, competitive binding assay, shRNA knockdown, overexpression rescue, proteasome inhibitor treatment, cell migration and invasion assays, in vivo metastasis model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP for protein interactions, competitive binding, RNAi epistasis, multiple orthogonal functional readouts in single rigorous study\",\n      \"pmids\": [\"32737199\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Metformin activates the AMPK-Pdlim5 pathway to inhibit vascular smooth muscle cell (VSMC) migration. Expression of phosphomimetic S177D-Pdlim5 inhibits lamellipodia formation and migration in VSMCs; the phospho-abolished S177A-Pdlim5 mutant undermines metformin's protective effects on neointima formation and diabetes-accelerated atherosclerosis in vivo.\",\n      \"method\": \"Exogenous expression of phosphomimetic/unphosphorylatable Pdlim5 mutants in VSMC line, adenovirus-mediated expression in ApoE-/- mice, wire-injury carotid artery model, Myh11-cre-EGFP lineage tracing\",\n      \"journal\": \"Frontiers in cardiovascular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo genetic validation with mutant Pdlim5 rescues, but mainly replicates AMPK phosphorylation finding from PMID:25635515; single lab\",\n      \"pmids\": [\"34368251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RBM20 and RBM24 cooperatively promote expression of short ENH (PDLIM5) splice variants (including ENH3) by binding the 5' intronic region of exon 11. In healthy conditions, these splicing factors maintain expression of short ENH isoforms; hypertrophic stimulations repress RBM20/RBM24 expression, shifting toward long isoforms (ENH1) that promote hypertrophic growth.\",\n      \"method\": \"RNA binding assays (RIP), overexpression of RBM20/RBM24, alternative splicing analysis, RT-PCR isoform quantification\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA binding demonstrated, functional consequence on isoform balance shown, single lab with two orthogonal methods\",\n      \"pmids\": [\"27289039\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PDLIM5 binds to AMPK and affects its activation and degradation in prostate cancer cells. Knockdown of PDLIM5 inhibits cell proliferation, induces G2/M arrest, and inhibits migration and invasion by reversing the mesenchymal phenotype.\",\n      \"method\": \"Co-immunoprecipitation, lentiviral shRNA knockdown, cell cycle analysis, migration/invasion assays, xenograft model\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — co-IP for AMPK binding, RNAi with defined cellular phenotypes, single lab; mechanism of AMPK regulation by PDLIM5 not fully resolved\",\n      \"pmids\": [\"29228678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Reduced PDLIM5 levels in Pdlim5 heterozygous knockout mice attenuate methamphetamine-induced locomotor hyperactivity and prepulse inhibition impairment, and increase immobility in forced swimming test (reversed by imipramine). Homozygous knockout of Pdlim5 is embryonic lethal. Transient inhibition of PDLIM5 via PKCε translocation block phenocopies the heterozygous effect.\",\n      \"method\": \"Pdlim5 hetero KO mouse model, behavioral testing (locomotor activity, prepulse inhibition, forced swim), pharmacological intervention\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with defined behavioral phenotypes, pharmacological validation; molecular mechanism of PDLIM5 in CNS not resolved at biochemical level\",\n      \"pmids\": [\"23593136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Human PDLIM5/ENH is expressed as two major mRNA isoforms: a 1.9 kb transcript predominantly in heart and skeletal muscle, and a 5.6 kb transcript ubiquitously expressed in human tissues. The protein shares 88% identity with rat ENH and is located on chromosome 4q22.\",\n      \"method\": \"Northern blot, cDNA cloning, radiation hybrid mapping, chromosomal localization by PCR\",\n      \"journal\": \"Journal of human genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — characterization of expression and chromosomal location; no direct mechanistic experiment on protein function\",\n      \"pmids\": [\"10429367\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"During human pluripotent stem cell cardiomyogenesis, PDLIM5 is strongly up-regulated, and novel stage-specific isoforms (53 kDa isoforms b and g, corresponding to transcript variants 2 and 7) emerge simultaneously with onset of early cardiac transcription factor NKX2.5 expression.\",\n      \"method\": \"SILAC-based quantitative proteomics, shotgun proteomics, isoform identification during cardiomyogenesis stages\",\n      \"journal\": \"Journal of proteome research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — proteomic identification of novel isoforms during differentiation; no direct functional experiment on PDLIM5 mechanism\",\n      \"pmids\": [\"28139119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PDLIM5 knockdown in papillary thyroid carcinoma cells inhibits migration, invasion, and proliferation. PDLIM5 knockdown reduces Ras and Phospho-ERK1/2 expression, suggesting PDLIM5 promotes PTC via activation of the Ras-ERK pathway.\",\n      \"method\": \"shRNA knockdown, migration/invasion assays, Western blot for Ras and p-ERK1/2\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, loss-of-function with pathway marker readout but no direct binding or mechanistic experiment linking PDLIM5 to Ras-ERK\",\n      \"pmids\": [\"29574154\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PDLIM5 (ENH) is a cytoplasmic scaffold/adaptor protein with an N-terminal PDZ domain (binding α-actinin, actin, and cytoskeletal components at the Z-disk) and three C-terminal LIM domains (mediating interactions with PKCε, N-type Ca²⁺ channels, Id2, and SMAD3); it forms a PKCε–ENH–N-type Ca²⁺ channel ternary complex to facilitate specific PKC signaling at neuronal synapses, sequesters Id2 in the cytoplasm to regulate neural differentiation, protects SMAD3 from STUB1-mediated proteasomal degradation to sustain TGFβ signaling, is directly phosphorylated by AMPK at Ser177 to inhibit Rac1-Arp2/3-dependent cell migration, and regulates dendritic spine morphology by interacting with SPAR at the postsynaptic density.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PDLIM5 (ENH) is a cytoplasmic PDZ-LIM scaffold/adaptor protein that organizes signaling at the cytoskeleton and synapse and tunes multiple signal transduction outputs [#0, #2]. Through its PDZ domain it binds actin and \\u03b1-actinin and co-localizes with \\u03b1-actinin at the cardiomyocyte Z-disk, anchoring it to the actin cytoskeleton [#2]. Its three C-terminal LIM domains mediate the protein-protein interactions that define its signaling roles: the second LIM domain assembles a Ca\\u00b2\\u207a-dependent PKC\\u03b5\\u2013ENH\\u2013N-type Ca\\u00b2\\u207a channel ternary complex that enables selective PKC-mediated potentiation of channel activity in neurons, with rising Ca\\u00b2\\u207a strengthening channel binding while dissociating PKC\\u03b5 [#0, #1]. The LIM domains also bind the helix-loop-helix region of Id2, sequestering it in the cytoplasm during neural differentiation to inactivate its transcriptional and cell-cycle functions [#3]. At the postsynaptic density PDLIM5 interacts with SPAR to control dendritic spine morphology, and PKC activation drives its delivery into spines [#4]. PDLIM5 is a direct AMPK substrate: phosphorylation at Ser177 suppresses peripheral Rac1 activity, displaces the Arp2/3 complex from the leading edge, and inhibits lamellipodia formation and cell migration, a brake that operates in vascular smooth muscle cells downstream of metformin-AMPK signaling [#5, #7]. In carcinoma contexts it stabilizes TGF\\u03b2 signaling by binding SMAD3 and competitively blocking its STUB1-mediated proteasomal degradation, thereby sustaining TGF\\u03b2-induced EMT [#6]. Pdlim5 is required for development, as homozygous knockout is embryonic lethal, and reduced dosage produces neurobehavioral phenotypes [#10].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established the cytoskeletal anchoring function of PDLIM5 by showing its PDZ domain links it to the actin/\\u03b1-actinin Z-disk, defining it as a structural scaffold.\",\n      \"evidence\": \"GST pulldown and immunofluorescence co-localization in rat neonatal cardiomyocytes, plus identification of LIM-less splice isoforms\",\n      \"pmids\": [\"10833443\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional role of the negatively-modulating short isoforms not tested\", \"Does not address signaling outputs of the LIM domains\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Answered how PKC\\u03b5 achieves substrate selectivity at neuronal channels by showing ENH acts as an adaptor bridging PKC\\u03b5 to N-type Ca\\u00b2\\u207a channels for selective channel potentiation.\",\n      \"evidence\": \"Reciprocal co-IP, pulldowns, electrophysiology, and peptide-mediated complex disruption in neurons\",\n      \"pmids\": [\"12665800\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which LIM domain mediates the interaction not yet resolved\", \"Physiological/behavioral consequence of channel potentiation untested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Refined the ternary complex mechanism by mapping the second LIM domain as the Ca\\u00b2\\u207a-dependent binding module and revealing opposing Ca\\u00b2\\u207a effects on channel vs PKC\\u03b5 binding.\",\n      \"evidence\": \"LIM-domain mutagenesis, Ca\\u00b2\\u207a-titrated in vitro binding, co-IP, and demonstration of ENH dimerization\",\n      \"pmids\": [\"15979848\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of Ca\\u00b2\\u201a sensing not determined\", \"Role of dimerization in complex assembly unclear\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showed PDLIM5 controls neural differentiation non-structurally by using its LIM domains to sequester Id2 in the cytoplasm, inactivating its nuclear functions.\",\n      \"evidence\": \"Co-IP, GST pulldown, RNAi rescue, and immunofluorescence in retinoic-acid-differentiated neuroblastoma cells\",\n      \"pmids\": [\"16549780\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other HLH/Id proteins are similarly sequestered untested\", \"Link to downstream cell-cycle targets indirect\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Placed PDLIM5 at the postsynaptic density as a regulator of dendritic spine shape via SPAR, with PKC controlling its synaptic delivery.\",\n      \"evidence\": \"Co-IP, RNAi, overexpression, interaction disruption, and spine morphometry in neurons\",\n      \"pmids\": [\"19900557\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular link between SPAR binding and actin remodeling not defined\", \"Whether spine effects require the PKC\\u03b5/channel complex unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Provided in vivo evidence that PDLIM5 dosage is essential for development and modulates neurobehavioral phenotypes, connecting its PKC\\u03b5 scaffold role to CNS function.\",\n      \"evidence\": \"Pdlim5 heterozygous/homozygous knockout mice, behavioral assays, and PKC\\u03b5 translocation-block phenocopy\",\n      \"pmids\": [\"23593136\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Biochemical mechanism underlying behavioral effects not resolved\", \"Embryonic lethal cause of homozygous KO not characterized\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified PDLIM5 as a direct AMPK substrate and defined a phosphorylation switch (Ser177) that brakes cell migration through Rac1-Arp2/3 suppression.\",\n      \"evidence\": \"In vitro kinase assay, phosphomimetic/phospho-dead mutants, migration and Rac1 pulldown assays, and immunofluorescence\",\n      \"pmids\": [\"25635515\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How phospho-Ser177 disrupts Rac-GEF association mechanistically unclear\", \"Relationship to the cytoskeletal scaffold function not integrated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Suggested a reciprocal relationship in which PDLIM5 binds AMPK and influences its activation/degradation, with knockdown suppressing prostate cancer proliferation and invasion.\",\n      \"evidence\": \"Co-IP, shRNA knockdown, cell-cycle and invasion assays, and xenograft in prostate cancer cells\",\n      \"pmids\": [\"29228678\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of AMPK regulation by PDLIM5 not resolved\", \"Single lab; binding not mapped to specific domains\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined a TGF\\u03b2-pathway function by showing PDLIM5 binds SMAD3 and competitively protects it from STUB1-mediated degradation to sustain signaling and EMT.\",\n      \"evidence\": \"Reciprocal co-IP, competitive binding, shRNA epistasis with STUB1, proteasome inhibition, migration/invasion, and in vivo metastasis in NSCLC\",\n      \"pmids\": [\"32737199\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Domain mediating SMAD3 binding not mapped\", \"Why SMAD2 is excluded not explained\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Validated the AMPK-PDLIM5 migration brake in vivo, showing the Ser177 phospho-switch mediates metformin's protection against neointima and atherosclerosis.\",\n      \"evidence\": \"Phosphomimetic/unphosphorylatable Pdlim5 mutant expression, adenoviral delivery in ApoE-/- mice, wire-injury model, and lineage tracing in VSMCs\",\n      \"pmids\": [\"34368251\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Largely replicates the 2015 phosphorylation mechanism\", \"Endogenous regulation of Ser177 in vivo not directly measured\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How PDLIM5's distinct scaffold functions (cytoskeletal anchoring, PKC\\u03b5/channel signaling, Id2 sequestration, SMAD3 stabilization, AMPK-Rac1 migration control) are coordinated within a cell, and how isoform composition selects among them, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model integrating PDZ and LIM functions\", \"Isoform-specific functional assignment incomplete\", \"Tissue-specific partner selection mechanism unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 3, 4, 6]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 6]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 5, 6]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 4]}\n    ],\n    \"complexes\": [\"PKC\\u03b5\\u2013ENH\\u2013N-type Ca\\u00b2\\u207a channel ternary complex\"],\n    \"partners\": [\"PRKCE\", \"ACTN\", \"ID2\", \"SPAR\", \"SMAD3\", \"STUB1\", \"PRKAA1\", \"ACTB\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}