{"gene":"SCYL3","run_date":"2026-04-28T20:42:07","timeline":{"discoveries":[{"year":2003,"finding":"SCYL3 (identified as PACE-1) was discovered as a novel binding partner of the C-terminal domain of ezrin via yeast two-hybrid screen. PACE-1 localizes to the cytoplasmic face of the Golgi apparatus in a manner dependent on its N-terminal myristoylation consensus sequence, and co-localizes with ezrin in lamellipodia. Despite a putative N-terminal kinase domain, biochemical assays showed PACE-1 has associated rather than intrinsic kinase activity, classifying it as a pseudokinase.","method":"Yeast two-hybrid screen, co-localization by immunofluorescence, subcellular fractionation, biochemical kinase assay, mutational analysis of myristoylation signal","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods (Y2H, localization, biochemical assay) in a single lab","pmids":["12651155"],"is_preprint":false},{"year":2017,"finding":"A SCYL3-NTRK1 chromosomal rearrangement produces an oncogenic fusion protein in colorectal cancer. The SCYL3-NTRK1 fusion protein constitutively activates the TRKA kinase domain, driving cell proliferation and survival, and is sensitive to TRKA inhibitors including entrectinib.","method":"RNA sequencing/fusion gene identification, functional oncogenicity assays in cancer cell lines, inhibitor sensitivity testing","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 — functional characterization of fusion with inhibitor sensitivity in a single lab","pmids":["28903424"],"is_preprint":false},{"year":2018,"finding":"SCYL3 plays an overlapping role with SCYL1 in maintaining motor neuron viability in vivo. Although Scyl3 knockout mice have no overt phenotype alone, combined loss of Scyl1 and Scyl3 accelerates motor neuron degeneration, hindlimb paralysis, muscle wasting, and loss of large-caliber axons compared to Scyl1 single knockouts, and correlates with mislocalization of TDP-43 in spinal motor neurons, implicating SCYL1/SCYL3 in TDP-43 proteostasis.","method":"Scyl1/Scyl3 double-knockout mouse model, histopathology, immunofluorescence for TDP-43 localization, behavioral/motor function assays, nerve morphometry","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — rigorous in vivo double-knockout genetic epistasis with multiple orthogonal phenotypic readouts","pmids":["29437892"],"is_preprint":false},{"year":2021,"finding":"The yeast SCYL3 ortholog Cex1 functions as a component of the COPI intracellular trafficking machinery, physically interacting with COPI coat subunits Sec27, Sec28, and Sec33 (Ret1/Cop1). Loss of Cex1 causes mislocalization of the N-glycosylation factor Wbp1, which interacts with Sec27 via a di-lysine motif, linking SCYL family proteins to COPI-mediated Golgi-to-ER trafficking and protein glycosylation.","method":"Co-immunoprecipitation, subcellular localization by fluorescence microscopy, genetic deletion (cex1Δ) with mislocalization phenotype readout","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal Co-IP and localization with functional consequence in yeast ortholog, single lab","pmids":["33753324"],"is_preprint":false},{"year":2022,"finding":"SCYL3 physically binds to ROCK2 (Rho kinase 2) via its C-terminal domain and regulates ROCK2 protein stability and transactivating activity. SCYL3-mediated ROCK2 stabilization increases formation of actin stress fibers and focal adhesions, promoting hepatocellular carcinoma cell proliferation, migration, and in vivo metastasis. Knockdown of SCYL3 attenuates these phenotypes, while endogenous overexpression in a Tp53 KO/c-Myc OE mouse model increases tumor development and metastasis.","method":"Co-immunoprecipitation, western blotting, immunofluorescence, SCYL3 knockdown/overexpression in HCC cells, in vivo tumor model (sleeping beauty transposon in Tp53 KO/c-Myc OE mice)","journal":"JHEP reports","confidence":"High","confidence_rationale":"Tier 2 — Co-IP binding partner identification combined with in vitro functional assays and in vivo genetic model, multiple orthogonal methods","pmids":["36440258"],"is_preprint":false}],"current_model":"SCYL3 is an N-terminally myristoylated pseudokinase that localizes to the Golgi apparatus and lamellipodia, where it interacts with ezrin; it functions in COPI-mediated intracellular trafficking (via its yeast ortholog Cex1), regulates TDP-43 proteostasis and motor neuron viability overlappingly with SCYL1 in vivo, and in cancer contexts physically binds and stabilizes ROCK2 to promote actin stress fiber formation, focal adhesions, and tumor metastasis."},"narrative":{"teleology":[{"year":2003,"claim":"The initial identification of SCYL3 (PACE-1) as an ezrin-binding pseudokinase that localizes to the Golgi via N-terminal myristoylation established its dual association with endomembranes and the cortical cytoskeleton, raising the question of what trafficking or signaling functions it performs.","evidence":"Yeast two-hybrid screen, co-immunofluorescence, subcellular fractionation, kinase assays, and myristoylation-signal mutagenesis in mammalian cells","pmids":["12651155"],"confidence":"Medium","gaps":["Ezrin interaction demonstrated only by yeast two-hybrid and co-localization without reciprocal co-immunoprecipitation from endogenous proteins","Functional consequence of Golgi localization and ezrin binding was not determined","Intrinsic pseudokinase versus scaffolding role not resolved"]},{"year":2018,"claim":"Genetic epistasis in mice revealed that SCYL3 shares a redundant, essential role with SCYL1 in motor neuron survival and TDP-43 nuclear proteostasis, establishing the first in vivo physiological function for SCYL3.","evidence":"Scyl1/Scyl3 double-knockout mouse model with histopathology, TDP-43 immunofluorescence, motor behavioral assays, and nerve morphometry","pmids":["29437892"],"confidence":"High","gaps":["Molecular mechanism by which SCYL3 maintains TDP-43 localization is unknown","Whether the COPI-trafficking function underlies the motor neuron phenotype was not tested","Single-knockout of Scyl3 shows no overt phenotype, so cell-type-specific roles remain unclear"]},{"year":2021,"claim":"Characterization of the yeast ortholog Cex1 linked SCYL3-family proteins to COPI vesicle coat machinery, providing a mechanistic basis for their role in Golgi-to-ER retrograde trafficking and protein glycosylation.","evidence":"Co-immunoprecipitation with COPI subunits (Sec27, Sec28, Ret1), fluorescence microscopy showing Wbp1 mislocalization upon cex1Δ in S. cerevisiae","pmids":["33753324"],"confidence":"Medium","gaps":["Direct interaction between mammalian SCYL3 and COPI subunits has not been demonstrated","Whether COPI-binding is conserved from yeast Cex1 to human SCYL3 requires validation","Structural basis of Cex1/COPI interaction is unresolved"]},{"year":2022,"claim":"Identification of ROCK2 as a direct binding partner stabilized by SCYL3 connected the pseudokinase to Rho-kinase-dependent cytoskeletal remodeling and provided a mechanistic explanation for its pro-metastatic activity in hepatocellular carcinoma.","evidence":"Co-immunoprecipitation, SCYL3 knockdown/overexpression in HCC cell lines, immunofluorescence for stress fibers and focal adhesions, and in vivo metastasis in a sleeping beauty transposon/Tp53 KO/c-Myc OE mouse model","pmids":["36440258"],"confidence":"High","gaps":["Whether SCYL3-ROCK2 interaction occurs in non-cancer physiological contexts is unknown","How pseudokinase scaffolding stabilizes ROCK2 at a structural level is unresolved","Relationship between ROCK2 stabilization and Golgi/COPI trafficking functions is not explored"]},{"year":null,"claim":"A unified model linking SCYL3's COPI-trafficking function, ezrin binding, ROCK2 stabilization, and TDP-43 proteostasis role has not been established; it remains unclear whether these represent distinct context-dependent activities or facets of a single scaffolding mechanism.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural or biochemical reconstitution of SCYL3 in any complex","Mammalian COPI interaction has not been directly tested","Cell-type-specific functions beyond motor neurons and hepatocytes are unexplored"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,4]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,4]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[0,3]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[3]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[4]}],"complexes":[],"partners":["EZR","ROCK2"],"other_free_text":[]},"mechanistic_narrative":"SCYL3 (PACE-1) is an N-terminally myristoylated pseudokinase that localizes to the Golgi apparatus and lamellipodia, where it associates with ezrin and participates in intracellular membrane trafficking and cytoskeletal regulation [PMID:12651155, PMID:33753324]. SCYL3 functions redundantly with SCYL1 to maintain motor neuron viability and TDP-43 nuclear proteostasis in vivo, as combined loss of both genes accelerates motor neuron degeneration and TDP-43 mislocalization in mice [PMID:29437892]. In hepatocellular carcinoma, SCYL3 physically binds and stabilizes ROCK2, promoting actin stress fiber and focal adhesion formation, thereby driving tumor cell proliferation, migration, and metastasis [PMID:36440258]."},"prefetch_data":{"uniprot":{"accession":"Q8IZE3","full_name":"Protein-associating with the carboxyl-terminal domain of ezrin","aliases":["Ezrin-binding protein PACE-1","SCY1-like protein 3"],"length_aa":742,"mass_kda":82.9,"function":"May play a role in regulating cell adhesion/migration complexes in migrating cells","subcellular_location":"Cytoplasm; Golgi apparatus; Cell projection, lamellipodium","url":"https://www.uniprot.org/uniprotkb/Q8IZE3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SCYL3","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"COPA","stoichiometry":0.2},{"gene":"COPB2","stoichiometry":0.2},{"gene":"COPE","stoichiometry":0.2},{"gene":"COPG1","stoichiometry":0.2},{"gene":"SYAP1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/SCYL3","total_profiled":1310},"omim":[{"mim_id":"608192","title":"SCY1-LIKE PROTEIN 3; SCYL3","url":"https://www.omim.org/entry/608192"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Golgi apparatus","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/SCYL3"},"hgnc":{"alias_symbol":["PACE-1","PACE1"],"prev_symbol":[]},"alphafold":{"accession":"Q8IZE3","domains":[{"cath_id":"1.10.510.10","chopping":"13-246","consensus_level":"medium","plddt":94.0378,"start":13,"end":246},{"cath_id":"1.25.40","chopping":"249-414","consensus_level":"medium","plddt":94.3846,"start":249,"end":414}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IZE3","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IZE3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IZE3-F1-predicted_aligned_error_v6.png","plddt_mean":69.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SCYL3","jax_strain_url":"https://www.jax.org/strain/search?query=SCYL3"},"sequence":{"accession":"Q8IZE3","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8IZE3.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8IZE3/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IZE3"}},"corpus_meta":[{"pmid":"33643817","id":"PMC_33643817","title":"Development of small-molecule tropomyosin receptor kinase (TRK) inhibitors for NTRK fusion cancers.","date":"2020","source":"Acta pharmaceutica Sinica. 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PACE-1 localizes to the cytoplasmic face of the Golgi apparatus (dependent on an N-terminal myristoylation consensus sequence, but not on ezrin association) and co-localizes with ezrin in lamellipodia. Biochemical assays showed PACE-1 has associated rather than intrinsic kinase activity, classifying it as a pseudokinase.\",\n      \"method\": \"Yeast two-hybrid screen, subcellular localization (immunofluorescence), biochemical kinase assay, mutagenesis of myristoylation site\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal binding assay with localization and kinase activity characterization in single study\",\n      \"pmids\": [\"12651155\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SCYL3 works in concert with SCYL1 to maintain motor neuron viability in vivo. Loss of Scyl3 alone has no apparent phenotype, but Scyl1/Scyl3 double-deficient mice show accelerated onset of motor neuron disease (motor dysfunction, hindlimb paralysis, neurogenic atrophy, motor neuron degeneration, loss of large-caliber axons) compared to Scyl1-deficient mice alone. Disease onset correlates with mislocalization of TDP-43 in spinal motor neurons, suggesting SCYL1 and SCYL3 regulate TDP-43 proteostasis.\",\n      \"method\": \"Genetic epistasis using double knockout mice, histopathology, immunofluorescence for TDP-43 localization, behavioral motor function assays\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean double-KO mouse model with defined cellular and behavioral phenotype, epistasis established, replicated across multiple readouts\",\n      \"pmids\": [\"29437892\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The yeast SCYL3 homolog (Cex1) and mammalian SCYL3 regulate Golgi morphology and protein glycosylation in concert with the COPI machinery, placing SCYL3 as a component of COPI-mediated intracellular trafficking.\",\n      \"method\": \"Yeast genetic model, co-immunoprecipitation with COPI subunits, subcellular localization, glycosylation assay in deletion mutants\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — yeast ortholog functional study with Co-IP and localization; mammalian SCYL3 role cited as established context but primary experiments in yeast\",\n      \"pmids\": [\"33753324\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SCYL3 physically binds ROCK2 (Rho kinase 2) via its C-terminal domain, regulating ROCK2 protein stability and transactivating activity. This interaction leads to increased formation of actin stress fibers and focal adhesions, promoting hepatocellular carcinoma cell proliferation, migration, and metastasis.\",\n      \"method\": \"Co-immunoprecipitation, western blotting, immunofluorescence, SCYL3 knockdown/overexpression in HCC cells, in vivo mouse tumor model (Tp53 KO/c-Myc OE with sleeping beauty transposon system)\",\n      \"journal\": \"JHEP reports : innovation in hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP establishing direct binding, functional readouts (actin stress fibers, focal adhesions, migration), and in vivo validation in single study with multiple orthogonal methods\",\n      \"pmids\": [\"36440258\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"A SCYL3-NTRK1 fusion gene was identified in a colorectal cancer patient and shown to be oncogenic and sensitive to TRKA inhibitors (including entrectinib), consistent with constitutive activation of the TRKA kinase domain driven by the SCYL3 fusion partner.\",\n      \"method\": \"Molecular characterization of fusion gene, functional oncogenicity assay, inhibitor sensitivity testing\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — fusion protein characterization in a single patient case with functional oncogenicity testing but limited mechanistic depth on SCYL3's contribution\",\n      \"pmids\": [\"28903424\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SCYL3 is a pseudokinase (lacking intrinsic kinase activity) that localizes to the Golgi apparatus (via N-terminal myristoylation) and to lamellipodia (via ezrin binding), participates in COPI-dependent intracellular trafficking and Golgi homeostasis, cooperates with SCYL1 to maintain motor neuron viability and TDP-43 proteostasis in vivo, and promotes cancer cell migration and metastasis by physically binding and stabilizing ROCK2 through its C-terminal domain to enhance actin stress fiber and focal adhesion formation.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll classify each paper first, then extract discoveries only from KEPT papers.\n\n**Classification:**\n\n**Retrieved Papers:**\n1. TRK inhibitors review → EXCLUDE (alias collision: mentions SCYL3-NTRK1 fusion but is about TRK inhibitors, not SCYL3 protein function)\n2. Mycobacterium NAT genes → EXCLUDE (unrelated)\n3. SCYL3-NTRK1 rearrangement in colorectal cancer → KEEP (describes SCYL3 fusion, functional characterization)\n4. SARS-CoV-2 evolution → EXCLUDE (unrelated)\n5. Low-carbohydrate training → EXCLUDE (unrelated)\n6. SCYL1 and SCYL3 overlapping role in motor neurons → KEEP (directly about SCYL3)\n7. SCYL pseudokinases in neuronal function → KEEP (directly about SCYL3)\n8. PACE-1/SCYL3 interacts with ezrin → KEEP (PACE-1 is SCYL3)\n9. SCYL3 binding partner ROCK2 in HCC → KEEP (directly about SCYL3)\n10. Endothelin-1 in myocardium → EXCLUDE (unrelated)\n11. CRISPR allelic series using Scyl1 → EXCLUDE (about SCYL1 as model, not SCYL3)\n12. Non-Parkinson movement disorders → EXCLUDE (unrelated)\n13. Bacterial phyla dataset → EXCLUDE (unrelated)\n14. Parkinson susceptibility genes (mentions PACE-1/ATP) → EXCLUDE (no mechanistic data on SCYL3)\n15. GWAS eQTL ischemic stroke → EXCLUDE (expression/association study)\n16. Cex1 and COPI trafficking (yeast homolog of SCYL3) → KEEP (ortholog functional study)\n\n**gene2pubmed papers:** All 30 are about CCL15/chemokines, RSV, smoking cessation, Alzheimer's biomarkers, or other completely unrelated topics → EXCLUDE all.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2003,\n      \"finding\": \"SCYL3 (identified as PACE-1) was discovered as a novel binding partner of the C-terminal domain of ezrin via yeast two-hybrid screen. PACE-1 localizes to the cytoplasmic face of the Golgi apparatus in a manner dependent on its N-terminal myristoylation consensus sequence, and co-localizes with ezrin in lamellipodia. Despite a putative N-terminal kinase domain, biochemical assays showed PACE-1 has associated rather than intrinsic kinase activity, classifying it as a pseudokinase.\",\n      \"method\": \"Yeast two-hybrid screen, co-localization by immunofluorescence, subcellular fractionation, biochemical kinase assay, mutational analysis of myristoylation signal\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (Y2H, localization, biochemical assay) in a single lab\",\n      \"pmids\": [\"12651155\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"A SCYL3-NTRK1 chromosomal rearrangement produces an oncogenic fusion protein in colorectal cancer. The SCYL3-NTRK1 fusion protein constitutively activates the TRKA kinase domain, driving cell proliferation and survival, and is sensitive to TRKA inhibitors including entrectinib.\",\n      \"method\": \"RNA sequencing/fusion gene identification, functional oncogenicity assays in cancer cell lines, inhibitor sensitivity testing\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional characterization of fusion with inhibitor sensitivity in a single lab\",\n      \"pmids\": [\"28903424\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SCYL3 plays an overlapping role with SCYL1 in maintaining motor neuron viability in vivo. Although Scyl3 knockout mice have no overt phenotype alone, combined loss of Scyl1 and Scyl3 accelerates motor neuron degeneration, hindlimb paralysis, muscle wasting, and loss of large-caliber axons compared to Scyl1 single knockouts, and correlates with mislocalization of TDP-43 in spinal motor neurons, implicating SCYL1/SCYL3 in TDP-43 proteostasis.\",\n      \"method\": \"Scyl1/Scyl3 double-knockout mouse model, histopathology, immunofluorescence for TDP-43 localization, behavioral/motor function assays, nerve morphometry\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — rigorous in vivo double-knockout genetic epistasis with multiple orthogonal phenotypic readouts\",\n      \"pmids\": [\"29437892\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The yeast SCYL3 ortholog Cex1 functions as a component of the COPI intracellular trafficking machinery, physically interacting with COPI coat subunits Sec27, Sec28, and Sec33 (Ret1/Cop1). Loss of Cex1 causes mislocalization of the N-glycosylation factor Wbp1, which interacts with Sec27 via a di-lysine motif, linking SCYL family proteins to COPI-mediated Golgi-to-ER trafficking and protein glycosylation.\",\n      \"method\": \"Co-immunoprecipitation, subcellular localization by fluorescence microscopy, genetic deletion (cex1Δ) with mislocalization phenotype readout\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP and localization with functional consequence in yeast ortholog, single lab\",\n      \"pmids\": [\"33753324\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SCYL3 physically binds to ROCK2 (Rho kinase 2) via its C-terminal domain and regulates ROCK2 protein stability and transactivating activity. SCYL3-mediated ROCK2 stabilization increases formation of actin stress fibers and focal adhesions, promoting hepatocellular carcinoma cell proliferation, migration, and in vivo metastasis. Knockdown of SCYL3 attenuates these phenotypes, while endogenous overexpression in a Tp53 KO/c-Myc OE mouse model increases tumor development and metastasis.\",\n      \"method\": \"Co-immunoprecipitation, western blotting, immunofluorescence, SCYL3 knockdown/overexpression in HCC cells, in vivo tumor model (sleeping beauty transposon in Tp53 KO/c-Myc OE mice)\",\n      \"journal\": \"JHEP reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP binding partner identification combined with in vitro functional assays and in vivo genetic model, multiple orthogonal methods\",\n      \"pmids\": [\"36440258\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SCYL3 is an N-terminally myristoylated pseudokinase that localizes to the Golgi apparatus and lamellipodia, where it interacts with ezrin; it functions in COPI-mediated intracellular trafficking (via its yeast ortholog Cex1), regulates TDP-43 proteostasis and motor neuron viability overlappingly with SCYL1 in vivo, and in cancer contexts physically binds and stabilizes ROCK2 to promote actin stress fiber formation, focal adhesions, and tumor metastasis.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SCYL3 is a pseudokinase that lacks intrinsic catalytic activity and functions in intracellular trafficking, cytoskeletal regulation, and neuronal homeostasis. It localizes to the cytoplasmic face of the Golgi apparatus via N-terminal myristoylation and to lamellipodia through direct interaction with the C-terminal domain of ezrin, and participates in COPI-dependent Golgi morphology and protein glycosylation [PMID:12651155, PMID:33753324]. SCYL3 cooperates with SCYL1 to maintain motor neuron viability and TDP-43 proteostasis in vivo, as demonstrated by accelerated motor neuron disease in Scyl1/Scyl3 double-knockout mice [PMID:29437892]. Through its C-terminal domain, SCYL3 physically binds and stabilizes ROCK2, promoting actin stress fiber and focal adhesion formation to drive cancer cell migration and metastasis [PMID:36440258].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Identifying SCYL3 as a pseudokinase that binds ezrin and localizes to the Golgi established its dual subcellular distribution and ruled out intrinsic kinase activity, framing it as a scaffolding or regulatory protein rather than a conventional kinase.\",\n      \"evidence\": \"Yeast two-hybrid screen with ezrin, immunofluorescence localization, mutagenesis of myristoylation site, and in vitro kinase assay in mammalian cells\",\n      \"pmids\": [\"12651155\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Ezrin binding demonstrated by yeast two-hybrid without independent validation by endogenous co-immunoprecipitation\",\n        \"Functional consequence of SCYL3–ezrin interaction at lamellipodia not determined\",\n        \"No identification of downstream effectors or trafficking cargo\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Discovery of an oncogenic SCYL3-NTRK1 fusion gene in colorectal cancer demonstrated that the SCYL3 locus can contribute to oncogenesis, though the mechanistic role of SCYL3 sequences in the fusion remained unclear.\",\n      \"evidence\": \"Molecular characterization of fusion gene, functional oncogenicity assay, and TRKA inhibitor sensitivity testing in a single patient-derived model\",\n      \"pmids\": [\"28903424\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"Single patient case; not independently replicated in additional tumors\",\n        \"SCYL3's specific contribution to fusion protein function (beyond providing a promoter or dimerization domain) not dissected\",\n        \"No insight into wild-type SCYL3 function in cancer biology\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrating that SCYL3 cooperates with SCYL1 to maintain motor neuron viability and TDP-43 localization revealed a non-redundant neuroprotective role for SCYL3 and linked SCYL family pseudokinases to RNA-binding protein proteostasis.\",\n      \"evidence\": \"Scyl1/Scyl3 double-knockout mice with histopathology, motor function assays, and TDP-43 immunofluorescence in spinal motor neurons\",\n      \"pmids\": [\"29437892\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism by which SCYL3 regulates TDP-43 localization or stability is unknown\",\n        \"Whether SCYL3 directly interacts with SCYL1 or acts in parallel pathway not resolved\",\n        \"Absence of a phenotype in Scyl3 single-KO mice limits understanding of its independent function\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Placing SCYL3 (and its yeast homolog Cex1) within COPI-dependent trafficking established a conserved molecular function in Golgi homeostasis and protein glycosylation, extending the Golgi localization finding to a defined trafficking pathway.\",\n      \"evidence\": \"Yeast genetic model with Cex1 deletion, co-immunoprecipitation with COPI subunits, glycosylation assays\",\n      \"pmids\": [\"33753324\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Primary experiments performed in yeast; mammalian SCYL3 role in COPI trafficking inferred from ortholog rather than directly tested\",\n        \"Specific COPI-coat subunit interaction surface on SCYL3 not mapped\",\n        \"Cargo specificity of SCYL3-dependent trafficking unknown\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identifying ROCK2 as a direct binding partner of SCYL3's C-terminal domain provided a mechanistic basis for SCYL3's role in actin cytoskeletal remodeling, cell migration, and hepatocellular carcinoma metastasis.\",\n      \"evidence\": \"Co-immunoprecipitation, SCYL3 knockdown/overexpression in HCC cell lines, actin stress fiber and focal adhesion imaging, and in vivo mouse tumor model\",\n      \"pmids\": [\"36440258\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct binding demonstrated by Co-IP; structural basis of SCYL3–ROCK2 interaction not resolved\",\n        \"How SCYL3 stabilizes ROCK2 protein (proteasome inhibition, chaperone function) not defined\",\n        \"Generalizability beyond hepatocellular carcinoma not established\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown how SCYL3's Golgi-trafficking function, ezrin binding at lamellipodia, and ROCK2 stabilization are coordinated, and whether these represent independent or interconnected pathways; the direct mechanism by which SCYL3 influences TDP-43 proteostasis also remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No structural model of SCYL3 or its protein–protein interaction interfaces\",\n        \"Relationship between Golgi-trafficking role and cytoskeletal/migratory function not tested\",\n        \"Mechanism linking SCYL3 to TDP-43 localization or proteostasis undefined\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"EZR\",\n      \"ROCK2\",\n      \"SCYL1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"SCYL3 (PACE-1) is an N-terminally myristoylated pseudokinase that localizes to the Golgi apparatus and lamellipodia, where it associates with ezrin and participates in intracellular membrane trafficking and cytoskeletal regulation [PMID:12651155, PMID:33753324]. SCYL3 functions redundantly with SCYL1 to maintain motor neuron viability and TDP-43 nuclear proteostasis in vivo, as combined loss of both genes accelerates motor neuron degeneration and TDP-43 mislocalization in mice [PMID:29437892]. In hepatocellular carcinoma, SCYL3 physically binds and stabilizes ROCK2, promoting actin stress fiber and focal adhesion formation, thereby driving tumor cell proliferation, migration, and metastasis [PMID:36440258].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"The initial identification of SCYL3 (PACE-1) as an ezrin-binding pseudokinase that localizes to the Golgi via N-terminal myristoylation established its dual association with endomembranes and the cortical cytoskeleton, raising the question of what trafficking or signaling functions it performs.\",\n      \"evidence\": \"Yeast two-hybrid screen, co-immunofluorescence, subcellular fractionation, kinase assays, and myristoylation-signal mutagenesis in mammalian cells\",\n      \"pmids\": [\"12651155\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Ezrin interaction demonstrated only by yeast two-hybrid and co-localization without reciprocal co-immunoprecipitation from endogenous proteins\",\n        \"Functional consequence of Golgi localization and ezrin binding was not determined\",\n        \"Intrinsic pseudokinase versus scaffolding role not resolved\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Genetic epistasis in mice revealed that SCYL3 shares a redundant, essential role with SCYL1 in motor neuron survival and TDP-43 nuclear proteostasis, establishing the first in vivo physiological function for SCYL3.\",\n      \"evidence\": \"Scyl1/Scyl3 double-knockout mouse model with histopathology, TDP-43 immunofluorescence, motor behavioral assays, and nerve morphometry\",\n      \"pmids\": [\"29437892\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Molecular mechanism by which SCYL3 maintains TDP-43 localization is unknown\",\n        \"Whether the COPI-trafficking function underlies the motor neuron phenotype was not tested\",\n        \"Single-knockout of Scyl3 shows no overt phenotype, so cell-type-specific roles remain unclear\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Characterization of the yeast ortholog Cex1 linked SCYL3-family proteins to COPI vesicle coat machinery, providing a mechanistic basis for their role in Golgi-to-ER retrograde trafficking and protein glycosylation.\",\n      \"evidence\": \"Co-immunoprecipitation with COPI subunits (Sec27, Sec28, Ret1), fluorescence microscopy showing Wbp1 mislocalization upon cex1Δ in S. cerevisiae\",\n      \"pmids\": [\"33753324\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct interaction between mammalian SCYL3 and COPI subunits has not been demonstrated\",\n        \"Whether COPI-binding is conserved from yeast Cex1 to human SCYL3 requires validation\",\n        \"Structural basis of Cex1/COPI interaction is unresolved\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identification of ROCK2 as a direct binding partner stabilized by SCYL3 connected the pseudokinase to Rho-kinase-dependent cytoskeletal remodeling and provided a mechanistic explanation for its pro-metastatic activity in hepatocellular carcinoma.\",\n      \"evidence\": \"Co-immunoprecipitation, SCYL3 knockdown/overexpression in HCC cell lines, immunofluorescence for stress fibers and focal adhesions, and in vivo metastasis in a sleeping beauty transposon/Tp53 KO/c-Myc OE mouse model\",\n      \"pmids\": [\"36440258\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether SCYL3-ROCK2 interaction occurs in non-cancer physiological contexts is unknown\",\n        \"How pseudokinase scaffolding stabilizes ROCK2 at a structural level is unresolved\",\n        \"Relationship between ROCK2 stabilization and Golgi/COPI trafficking functions is not explored\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A unified model linking SCYL3's COPI-trafficking function, ezrin binding, ROCK2 stabilization, and TDP-43 proteostasis role has not been established; it remains unclear whether these represent distinct context-dependent activities or facets of a single scaffolding mechanism.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No structural or biochemical reconstitution of SCYL3 in any complex\",\n        \"Mammalian COPI interaction has not been directly tested\",\n        \"Cell-type-specific functions beyond motor neurons and hepatocytes are unexplored\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"EZR\",\n      \"ROCK2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}