{"gene":"COPE","run_date":"2026-06-09T22:57:19","timeline":{"discoveries":[{"year":1994,"finding":"epsilon-COP (COPE) is a component of the coatomer complex required for maintaining Golgi structure and mediating ER-through-Golgi transport. In the CHO ldlF temperature-sensitive mutant, loss of epsilon-COP function at the non-permissive temperature caused Golgi dissociation into vesicles and tubules (resembling brefeldin A effects) and disrupted ER-to-Golgi transport and endocytic recycling of LDL receptors. A hamster cDNA encoding epsilon-COP specifically corrected all ts defects, providing the first genetic evidence that coatomer plays roles in Golgi structure maintenance, ER-through-Golgi transport, and endocytic recycling.","method":"Somatic cell genetics (CHO temperature-sensitive mutant ldlF), cDNA complementation cloning, immunofluorescence microscopy of Golgi morphology, functional assays for LDL receptor recycling and ER-Golgi transport","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic complementation with defined cDNA rescuing multiple distinct phenotypes, replicated across multiple assays in a landmark paper","pmids":["8207054"],"is_preprint":false},{"year":1996,"finding":"A single point mutation (Glu251Lys) in epsilon-COP is responsible for all temperature-sensitive membrane-transport defects in ldlF cells. The mutant ts-epsilon-COP protein is synthesized normally but is thermolabile (t1/2 >6 h at 34°C, ~1-2 h at 39.5°C), and its instability accounts for the Golgi disintegration, ER-Golgi transport block, and LDL receptor degradation at the non-permissive temperature. The stability of beta-COP was not directly linked to that of epsilon-COP.","method":"Point mutation identification by sequencing, transfection rescue assays, pulse-chase stability analysis, immunochemical analysis, isoelectric focusing","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — active-site/missense mutagenesis with functional rescue, protein stability assays, multiple orthogonal methods in single focused paper","pmids":["8626666"],"is_preprint":false},{"year":1998,"finding":"In yeast, epsilon-COP (Sec28p) is a structural component of coatomer whose primary function is to stabilize alpha-COP (Ret1p) and the coatomer complex. Overproduction of epsilon-COP suppresses temperature-sensitive defects of an alpha-COP mutant (ret1-3) by stabilizing alpha-COP levels. Deletion of epsilon-COP (sec28Δ) is not lethal but causes thermosensitivity; at 37°C, alpha-COP levels rapidly diminish and ER-to-Golgi transport (CPY maturation) is blocked. Allele-specific synthetic lethality between sec28Δ and alpha-COP mutations further supports a direct functional interaction.","method":"Yeast genetics (deletion, overexpression, high-copy suppressor screen), temperature-sensitive growth assays, carboxypeptidase Y trafficking assay, gel filtration of coatomer complex, synthetic lethality analysis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal genetic and biochemical approaches, allele-specific synthetic lethality demonstrating direct functional interaction","pmids":["9463377"],"is_preprint":false},{"year":1999,"finding":"The yeast gene ANU2 encodes the yeast homologue of mammalian epsilon-COP (sharing 20% sequence identity). Mutation or deletion of ANU2 causes defects in ER-to-Golgi vesicular transport, accumulation of ER membranes (shown by electron microscopy), and abnormal nuclear morphology (irregular, multi-lobed nuclei). These results place epsilon-COP in the early secretory pathway and link its loss to structural nuclear abnormalities.","method":"Yeast temperature-sensitive mutant screen using GFP-tagged nucleoplasmin, genetic mapping and sequencing of ANU2, gene disruption, electron microscopy, CPY secretion assay for ER-Golgi transport","journal":"Cell structure and function","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO with defined cellular and ultrastructural phenotype, functional transport assay, single lab","pmids":["10532354"],"is_preprint":false},{"year":2003,"finding":"Depletion of epsilon-COP in ldlF cells (by shifting to non-permissive temperature) vesiculates the Golgi and induces a brefeldin A-resistant, direct endosome-to-ER transport pathway for ricin that bypasses the Golgi apparatus. Ricin reached the ER (shown by glycosylation and sulfation assays) while normal Golgi-mediated retrograde transport was severely inhibited, demonstrating that epsilon-COP/COPI function is required for canonical retrograde Golgi transport and that its loss reveals an alternative transport route.","method":"Temperature-sensitive ldlF cell system, ricin transport assay with modified ricin (ricin sulf-2), radioactive mannose incorporation into ER-glycosylated ricin, sulfate labeling of trans-Golgi-processed ricin, brefeldin A treatment, cytotoxicity assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple biochemical transport assays using a validated genetic model, single lab","pmids":["12847103"],"is_preprint":false},{"year":2010,"finding":"The crystal structure of the alpha-COP C-terminal domain (CTD) in complex with full-length epsilon-COP was determined at 2.9 Å resolution. epsilon-COP adopts a tetratricopeptide repeat (TPR) fold that deviates substantially from canonical superhelical conformation; its TPRs form a circular bracelet that wraps around a protruding beta-hairpin of the alpha-COP CTD, interlocking the two proteins. The heterodimer forms in solution, and biochemical assays demonstrated that it directly interacts with the Dsl1 tethering complex, suggesting the heterodimer is exposed on the surface of COPI vesicles.","method":"X-ray crystallography (2.9 Å), biochemical solution studies (heterodimer formation), pull-down/binding assay with Dsl1 tethering complex","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with functional biochemical validation (complex formation in solution, direct Dsl1 interaction), multiple orthogonal methods","pmids":["20534429"],"is_preprint":false}],"current_model":"COPE (epsilon-COP) is a structural subunit of the heptameric coatomer (COPI) complex that stabilizes alpha-COP and the coatomer assembly; it adopts a TPR fold that interlocks with the alpha-COP C-terminal domain, the heterodimer is exposed on COPI vesicles and directly contacts the Dsl1 tethering complex, and epsilon-COP function is required for maintaining Golgi structure and mediating ER-through-Golgi anterograde and retrograde membrane transport."},"narrative":{"mechanistic_narrative":"COPE (epsilon-COP) is a structural subunit of the coatomer (COPI) complex that maintains coatomer integrity and is required for Golgi structure and ER-through-Golgi membrane transport [PMID:8207054]. Its core molecular role is to stabilize alpha-COP and the assembled coatomer: in yeast, epsilon-COP overproduction rescues an alpha-COP mutant and its deletion causes rapid loss of alpha-COP and a block in ER-to-Golgi transport, with allele-specific synthetic lethality establishing a direct functional partnership [PMID:9463377]. Structurally, epsilon-COP adopts a tetratricopeptide repeat (TPR) fold whose repeats form a circular bracelet that wraps around and interlocks with a beta-hairpin of the alpha-COP C-terminal domain, and the resulting heterodimer directly contacts the Dsl1 tethering complex, indicating exposure on the COPI vesicle surface [PMID:20534429]. Loss of epsilon-COP function in mammalian ldlF cells vesiculates the Golgi, blocks ER-to-Golgi transport and endocytic recycling of the LDL receptor, and impairs canonical retrograde Golgi transport [PMID:8207054, PMID:12847103]; a single Glu251Lys substitution renders the protein thermolabile, and its destabilization accounts for these transport and morphological defects [PMID:8626666]. No COPE-linked human Mendelian disease appears in the available corpus.","teleology":[{"year":1994,"claim":"Established that epsilon-COP/coatomer is functionally required in cells, linking it for the first time to Golgi maintenance, ER-Golgi transport, and endocytic recycling.","evidence":"CHO ldlF temperature-sensitive mutant rescued by hamster epsilon-COP cDNA, with Golgi morphology, ER-Golgi transport, and LDL receptor recycling assays","pmids":["8207054"],"confidence":"High","gaps":["Did not define the molecular activity of epsilon-COP within coatomer","Did not identify which coatomer subunits epsilon-COP contacts"]},{"year":1996,"claim":"Pinpointed the molecular basis of the ldlF phenotype to a single thermolabile point mutation, showing protein instability—not loss of a catalytic function—drives the transport defects.","evidence":"Sequencing identified Glu251Lys; transfection rescue and pulse-chase stability analysis of the mutant protein","pmids":["8626666"],"confidence":"High","gaps":["Did not establish how destabilized epsilon-COP affects the rest of the coatomer","Stability relationship to other subunits not directly linked"]},{"year":1998,"claim":"Defined epsilon-COP's primary molecular role as stabilizing alpha-COP and the coatomer complex, and demonstrated a direct functional interaction with alpha-COP.","evidence":"Yeast genetics: high-copy suppression of an alpha-COP ts mutant, sec28Δ phenotypes, gel filtration of coatomer, allele-specific synthetic lethality","pmids":["9463377"],"confidence":"High","gaps":["Did not resolve the structural basis of the epsilon-COP/alpha-COP interaction","Mechanism by which stabilization preserves transport not detailed"]},{"year":1999,"claim":"Confirmed the yeast homologue acts in the early secretory pathway and linked its loss to ER membrane accumulation and nuclear morphology defects.","evidence":"Yeast ts mutant screen, ANU2 disruption, electron microscopy, CPY secretion assay","pmids":["10532354"],"confidence":"Medium","gaps":["Mechanism connecting epsilon-COP loss to abnormal nuclear morphology unknown","Single lab, low sequence identity ortholog assignment"]},{"year":2003,"claim":"Showed that epsilon-COP/COPI function is required for canonical retrograde Golgi transport and that its loss unmasks an alternative direct endosome-to-ER route.","evidence":"ldlF cells at non-permissive temperature; ricin transport tracked by ER glycosylation and trans-Golgi sulfation, with brefeldin A treatment","pmids":["12847103"],"confidence":"Medium","gaps":["Molecular components of the bypass route not identified","Single lab biochemical readouts"]},{"year":2010,"claim":"Resolved how epsilon-COP physically interlocks with alpha-COP and contacts the Dsl1 tethering complex, providing a structural basis for its stabilizing and vesicle-surface roles.","evidence":"2.9 Å crystal structure of alpha-COP CTD bound to full-length epsilon-COP; solution heterodimer formation and Dsl1 pull-down assays","pmids":["20534429"],"confidence":"High","gaps":["Structure of epsilon-COP within the full heptameric coatomer not determined","Functional consequence of the Dsl1 contact for tethering in vivo not established"]},{"year":null,"claim":"How the epsilon-COP/alpha-COP heterodimer integrates Dsl1-mediated tethering with COPI vesicle uncoating and fusion in intact cells remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No in vivo mechanism linking the Dsl1 contact to vesicle tethering","No human disease association in the corpus","No structure of the assembled coatomer with epsilon-COP in context"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,2,5]},{"term_id":"GO:0140313","term_label":"molecular sequestering activity","supporting_discovery_ids":[2]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[0,4]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[5]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[0,3]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,2,4]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[0,4]}],"complexes":["COPI coatomer"],"partners":["COPA","DSL1 COMPLEX"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O14579","full_name":"Coatomer subunit epsilon","aliases":["Epsilon-coat protein","Epsilon-COP"],"length_aa":308,"mass_kda":34.5,"function":"The coatomer is a cytosolic protein complex that binds to dilysine motifs and reversibly associates with Golgi non-clathrin-coated vesicles, which further mediate biosynthetic protein transport from the ER, via the Golgi up to the trans Golgi network. The coatomer complex is required for budding from Golgi membranes, and is essential for the retrograde Golgi-to-ER transport of dilysine-tagged proteins. In mammals, the coatomer can only be recruited by membranes associated with ADP-ribosylation factors (ARFs), which are small GTP-binding proteins; the complex also influences the Golgi structural integrity, as well as the processing, activity, and endocytic recycling of LDL receptors (By similarity)","subcellular_location":"Cytoplasm; Golgi apparatus membrane; Cytoplasmic vesicle, COPI-coated vesicle membrane","url":"https://www.uniprot.org/uniprotkb/O14579/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/COPE","classification":"Common 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ALHAS","url":"https://www.omim.org/entry/621307"},{"mim_id":"620909","title":"KINESIN LIGHT CHAIN 4; KLC4","url":"https://www.omim.org/entry/620909"},{"mim_id":"620461","title":"ENCEPHALITIS, ACUTE, INFECTION-INDUCED, SUSCEPTIBILITY TO, 12; IIAE12","url":"https://www.omim.org/entry/620461"},{"mim_id":"619873","title":"PARENTI-MIGNOT NEURODEVELOPMENTAL SYNDROME; PMNDS","url":"https://www.omim.org/entry/619873"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Golgi apparatus","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/COPE"},"hgnc":{"alias_symbol":["epsilon-COP"],"prev_symbol":[]},"alphafold":{"accession":"O14579","domains":[{"cath_id":"1.25.40","chopping":"220-308","consensus_level":"medium","plddt":91.6529,"start":220,"end":308},{"cath_id":"1.25.40","chopping":"20-90","consensus_level":"medium","plddt":92.6746,"start":20,"end":90}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O14579","model_url":"https://alphafold.ebi.ac.uk/files/AF-O14579-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O14579-F1-predicted_aligned_error_v6.png","plddt_mean":89.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=COPE","jax_strain_url":"https://www.jax.org/strain/search?query=COPE"},"sequence":{"accession":"O14579","fasta_url":"https://rest.uniprot.org/uniprotkb/O14579.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O14579/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O14579"}},"corpus_meta":[{"pmid":"21266997","id":"PMC_21266997","title":"Cryptic 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In the CHO ldlF temperature-sensitive mutant, loss of epsilon-COP function at the non-permissive temperature caused Golgi dissociation into vesicles and tubules (resembling brefeldin A effects) and disrupted ER-to-Golgi transport and endocytic recycling of LDL receptors. A hamster cDNA encoding epsilon-COP specifically corrected all ts defects, providing the first genetic evidence that coatomer plays roles in Golgi structure maintenance, ER-through-Golgi transport, and endocytic recycling.\",\n      \"method\": \"Somatic cell genetics (CHO temperature-sensitive mutant ldlF), cDNA complementation cloning, immunofluorescence microscopy of Golgi morphology, functional assays for LDL receptor recycling and ER-Golgi transport\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic complementation with defined cDNA rescuing multiple distinct phenotypes, replicated across multiple assays in a landmark paper\",\n      \"pmids\": [\"8207054\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"A single point mutation (Glu251Lys) in epsilon-COP is responsible for all temperature-sensitive membrane-transport defects in ldlF cells. The mutant ts-epsilon-COP protein is synthesized normally but is thermolabile (t1/2 >6 h at 34°C, ~1-2 h at 39.5°C), and its instability accounts for the Golgi disintegration, ER-Golgi transport block, and LDL receptor degradation at the non-permissive temperature. The stability of beta-COP was not directly linked to that of epsilon-COP.\",\n      \"method\": \"Point mutation identification by sequencing, transfection rescue assays, pulse-chase stability analysis, immunochemical analysis, isoelectric focusing\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — active-site/missense mutagenesis with functional rescue, protein stability assays, multiple orthogonal methods in single focused paper\",\n      \"pmids\": [\"8626666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"In yeast, epsilon-COP (Sec28p) is a structural component of coatomer whose primary function is to stabilize alpha-COP (Ret1p) and the coatomer complex. Overproduction of epsilon-COP suppresses temperature-sensitive defects of an alpha-COP mutant (ret1-3) by stabilizing alpha-COP levels. Deletion of epsilon-COP (sec28Δ) is not lethal but causes thermosensitivity; at 37°C, alpha-COP levels rapidly diminish and ER-to-Golgi transport (CPY maturation) is blocked. Allele-specific synthetic lethality between sec28Δ and alpha-COP mutations further supports a direct functional interaction.\",\n      \"method\": \"Yeast genetics (deletion, overexpression, high-copy suppressor screen), temperature-sensitive growth assays, carboxypeptidase Y trafficking assay, gel filtration of coatomer complex, synthetic lethality analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal genetic and biochemical approaches, allele-specific synthetic lethality demonstrating direct functional interaction\",\n      \"pmids\": [\"9463377\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"The yeast gene ANU2 encodes the yeast homologue of mammalian epsilon-COP (sharing 20% sequence identity). Mutation or deletion of ANU2 causes defects in ER-to-Golgi vesicular transport, accumulation of ER membranes (shown by electron microscopy), and abnormal nuclear morphology (irregular, multi-lobed nuclei). These results place epsilon-COP in the early secretory pathway and link its loss to structural nuclear abnormalities.\",\n      \"method\": \"Yeast temperature-sensitive mutant screen using GFP-tagged nucleoplasmin, genetic mapping and sequencing of ANU2, gene disruption, electron microscopy, CPY secretion assay for ER-Golgi transport\",\n      \"journal\": \"Cell structure and function\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with defined cellular and ultrastructural phenotype, functional transport assay, single lab\",\n      \"pmids\": [\"10532354\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Depletion of epsilon-COP in ldlF cells (by shifting to non-permissive temperature) vesiculates the Golgi and induces a brefeldin A-resistant, direct endosome-to-ER transport pathway for ricin that bypasses the Golgi apparatus. Ricin reached the ER (shown by glycosylation and sulfation assays) while normal Golgi-mediated retrograde transport was severely inhibited, demonstrating that epsilon-COP/COPI function is required for canonical retrograde Golgi transport and that its loss reveals an alternative transport route.\",\n      \"method\": \"Temperature-sensitive ldlF cell system, ricin transport assay with modified ricin (ricin sulf-2), radioactive mannose incorporation into ER-glycosylated ricin, sulfate labeling of trans-Golgi-processed ricin, brefeldin A treatment, cytotoxicity assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple biochemical transport assays using a validated genetic model, single lab\",\n      \"pmids\": [\"12847103\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The crystal structure of the alpha-COP C-terminal domain (CTD) in complex with full-length epsilon-COP was determined at 2.9 Å resolution. epsilon-COP adopts a tetratricopeptide repeat (TPR) fold that deviates substantially from canonical superhelical conformation; its TPRs form a circular bracelet that wraps around a protruding beta-hairpin of the alpha-COP CTD, interlocking the two proteins. The heterodimer forms in solution, and biochemical assays demonstrated that it directly interacts with the Dsl1 tethering complex, suggesting the heterodimer is exposed on the surface of COPI vesicles.\",\n      \"method\": \"X-ray crystallography (2.9 Å), biochemical solution studies (heterodimer formation), pull-down/binding assay with Dsl1 tethering complex\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with functional biochemical validation (complex formation in solution, direct Dsl1 interaction), multiple orthogonal methods\",\n      \"pmids\": [\"20534429\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"COPE (epsilon-COP) is a structural subunit of the heptameric coatomer (COPI) complex that stabilizes alpha-COP and the coatomer assembly; it adopts a TPR fold that interlocks with the alpha-COP C-terminal domain, the heterodimer is exposed on COPI vesicles and directly contacts the Dsl1 tethering complex, and epsilon-COP function is required for maintaining Golgi structure and mediating ER-through-Golgi anterograde and retrograde membrane transport.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"COPE (epsilon-COP) is a structural subunit of the coatomer (COPI) complex that maintains coatomer integrity and is required for Golgi structure and ER-through-Golgi membrane transport [#0]. Its core molecular role is to stabilize alpha-COP and the assembled coatomer: in yeast, epsilon-COP overproduction rescues an alpha-COP mutant and its deletion causes rapid loss of alpha-COP and a block in ER-to-Golgi transport, with allele-specific synthetic lethality establishing a direct functional partnership [#2]. Structurally, epsilon-COP adopts a tetratricopeptide repeat (TPR) fold whose repeats form a circular bracelet that wraps around and interlocks with a beta-hairpin of the alpha-COP C-terminal domain, and the resulting heterodimer directly contacts the Dsl1 tethering complex, indicating exposure on the COPI vesicle surface [#5]. Loss of epsilon-COP function in mammalian ldlF cells vesiculates the Golgi, blocks ER-to-Golgi transport and endocytic recycling of the LDL receptor, and impairs canonical retrograde Golgi transport [#0, #4]; a single Glu251Lys substitution renders the protein thermolabile, and its destabilization accounts for these transport and morphological defects [#1]. No COPE-linked human Mendelian disease appears in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Established that epsilon-COP/coatomer is functionally required in cells, linking it for the first time to Golgi maintenance, ER-Golgi transport, and endocytic recycling.\",\n      \"evidence\": \"CHO ldlF temperature-sensitive mutant rescued by hamster epsilon-COP cDNA, with Golgi morphology, ER-Golgi transport, and LDL receptor recycling assays\",\n      \"pmids\": [\"8207054\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the molecular activity of epsilon-COP within coatomer\", \"Did not identify which coatomer subunits epsilon-COP contacts\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Pinpointed the molecular basis of the ldlF phenotype to a single thermolabile point mutation, showing protein instability—not loss of a catalytic function—drives the transport defects.\",\n      \"evidence\": \"Sequencing identified Glu251Lys; transfection rescue and pulse-chase stability analysis of the mutant protein\",\n      \"pmids\": [\"8626666\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish how destabilized epsilon-COP affects the rest of the coatomer\", \"Stability relationship to other subunits not directly linked\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Defined epsilon-COP's primary molecular role as stabilizing alpha-COP and the coatomer complex, and demonstrated a direct functional interaction with alpha-COP.\",\n      \"evidence\": \"Yeast genetics: high-copy suppression of an alpha-COP ts mutant, sec28Δ phenotypes, gel filtration of coatomer, allele-specific synthetic lethality\",\n      \"pmids\": [\"9463377\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the structural basis of the epsilon-COP/alpha-COP interaction\", \"Mechanism by which stabilization preserves transport not detailed\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Confirmed the yeast homologue acts in the early secretory pathway and linked its loss to ER membrane accumulation and nuclear morphology defects.\",\n      \"evidence\": \"Yeast ts mutant screen, ANU2 disruption, electron microscopy, CPY secretion assay\",\n      \"pmids\": [\"10532354\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism connecting epsilon-COP loss to abnormal nuclear morphology unknown\", \"Single lab, low sequence identity ortholog assignment\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Showed that epsilon-COP/COPI function is required for canonical retrograde Golgi transport and that its loss unmasks an alternative direct endosome-to-ER route.\",\n      \"evidence\": \"ldlF cells at non-permissive temperature; ricin transport tracked by ER glycosylation and trans-Golgi sulfation, with brefeldin A treatment\",\n      \"pmids\": [\"12847103\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular components of the bypass route not identified\", \"Single lab biochemical readouts\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Resolved how epsilon-COP physically interlocks with alpha-COP and contacts the Dsl1 tethering complex, providing a structural basis for its stabilizing and vesicle-surface roles.\",\n      \"evidence\": \"2.9 Å crystal structure of alpha-COP CTD bound to full-length epsilon-COP; solution heterodimer formation and Dsl1 pull-down assays\",\n      \"pmids\": [\"20534429\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of epsilon-COP within the full heptameric coatomer not determined\", \"Functional consequence of the Dsl1 contact for tethering in vivo not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the epsilon-COP/alpha-COP heterodimer integrates Dsl1-mediated tethering with COPI vesicle uncoating and fusion in intact cells remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No in vivo mechanism linking the Dsl1 contact to vesicle tethering\", \"No human disease association in the corpus\", \"No structure of the assembled coatomer with epsilon-COP in context\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 2, 5]},\n      {\"term_id\": \"GO:0140313\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 2, 4]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 4]}\n    ],\n    \"complexes\": [\"COPI coatomer\"],\n    \"partners\": [\"COPA\", \"Dsl1 complex\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":4,"faith_pct":100.0}}