{"gene":"TRAPPC5","run_date":"2026-04-28T21:42:59","timeline":{"discoveries":[{"year":2011,"finding":"TRAPPC5 (along with other core subunits) is a component of the mammalian TRAPP tethering complex. Binary interaction mapping of all known mammalian TRAPP components placed TRAPPC5 within the core TRAPP assembly, and evidence was presented that mammalian TRAPP does not form a TRAPPI-equivalent sub-complex as in yeast, suggesting the fundamental unit of mammalian TRAPP differs from the yeast counterpart.","method":"Co-immunoprecipitation, binary interaction mapping, and functional complementation assays across all known mammalian TRAPP subunits","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal Co-IP binary interaction map, single lab study","pmids":["21525244"],"is_preprint":false},{"year":2016,"finding":"TRAPPC5 is identified as a core TRAPP subunit conserved from yeast to humans. Core TRAPP subunits, including the TRAPPC5 homolog, self-assemble into a stable complex with guanine nucleotide exchange factor (GEF) activity toward Ypt1/Rab1, placing TRAPPC5 in the pathway of ER-to-Golgi vesicle tethering and Rab GTPase activation.","method":"Review synthesizing biochemical reconstitution, structural, and genetic epistasis data from the TRAPP field","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 — synthesis of reconstitution and structural data from multiple labs; review article","pmids":["27066478"],"is_preprint":false},{"year":2022,"finding":"Cryo-EM structures of yeast TRAPPII (which contains the TRAPPC5 ortholog as part of core TRAPP) in apo and Ypt32-bound states reveal a dimeric architecture. The core TRAPP module (including the TRAPPC5 ortholog) directly contacts the nucleotide-binding domain of Ypt32, providing the structural basis for GEF activity, while TRAPPII-specific subunit Trs120 also contacts Ypt32. The monomer transitions between open and closed conformations upon Ypt32 binding.","method":"Cryo-EM structure determination combined with functional GEF activity assays and mutagenesis","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structure with functional validation and mutagenesis in same study","pmids":["35080977"],"is_preprint":false},{"year":2022,"finding":"TRAPPC5 expression is regulated downstream of MCT4 (monocarboxylate transporter 4) in hepatocellular carcinoma cells. Knockdown of TRAPPC5 reduced HCC cell proliferation, migration, invasion, and epithelial-mesenchymal transition (EMT), and suppressed tumor growth in xenograft models, placing TRAPPC5 as a functionally required downstream effector of MCT4-driven HCC progression.","method":"RNA interference knockdown of TRAPPC5, CCK-8 proliferation assay, colony formation, transwell/wound-healing migration/invasion assays, western blot for EMT markers, xenograft tumor growth assay","journal":"Journal of hepatocellular carcinoma","confidence":"Medium","confidence_rationale":"Tier 2 — clean KO with defined cellular phenotype across multiple orthogonal assays, single lab","pmids":["35425722"],"is_preprint":false},{"year":2015,"finding":"High-throughput affinity purification-mass spectrometry (BioPlex) identified TRAPPC5 as part of a protein community corresponding to the TRAPP complex in human HEK293T cells, confirming its membership in the endogenous human TRAPP complex and its co-complex associations with other TRAPP subunits.","method":"High-throughput affinity purification coupled to mass spectrometry (AP-MS) in HEK293T cells","journal":"Cell","confidence":"Medium","confidence_rationale":"Tier 2 — large-scale AP-MS, multiple TRAPP subunits co-purified, independently reproduced in BioPlex 2.0 and 3.0","pmids":["26186194","28514442","33961781"],"is_preprint":false},{"year":2022,"finding":"OpenCell endogenous tagging and live-cell imaging localized TRAPPC5 to the Golgi apparatus in human cells, consistent with its role as a TRAPP complex subunit involved in vesicle tethering at the Golgi.","method":"Endogenous CRISPR tagging with fluorescent protein followed by confocal live-cell imaging and AP-MS interaction profiling","journal":"Science (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 — direct endogenous localization experiment with functional context from co-complex data","pmids":["35271311"],"is_preprint":false}],"current_model":"TRAPPC5 is a core subunit of the evolutionarily conserved TRAPP tethering complex, where it contributes to the GEF activity toward Rab1/Ypt1 GTPases and participates in ER-to-Golgi vesicle tethering; it localizes to the Golgi apparatus, is incorporated into higher-order TRAPPII and TRAPPIII complexes, and in cancer contexts functions downstream of MCT4 to promote hepatocellular carcinoma cell proliferation, migration, invasion, and EMT."},"narrative":{"teleology":[{"year":2011,"claim":"Binary interaction mapping established that TRAPPC5 is embedded within the core mammalian TRAPP assembly and that mammalian TRAPP does not recapitulate the yeast TRAPPI sub-complex architecture, redefining the minimal functional unit of mammalian TRAPP.","evidence":"Co-immunoprecipitation and binary interaction mapping of all known mammalian TRAPP subunits","pmids":["21525244"],"confidence":"Medium","gaps":["No direct structural data on TRAPPC5 contacts within the mammalian TRAPP assembly","Single-lab study without independent replication at the time"]},{"year":2015,"claim":"Large-scale affinity purification–mass spectrometry independently confirmed TRAPPC5 as a component of the endogenous human TRAPP complex, validating earlier binary mapping data with an orthogonal proteomics approach.","evidence":"AP-MS (BioPlex) in HEK293T cells, reproduced across BioPlex 2.0 and 3.0 datasets","pmids":["26186194","28514442","33961781"],"confidence":"Medium","gaps":["Stoichiometry and copy number of TRAPPC5 within the complex not determined","No functional readout beyond co-purification"]},{"year":2016,"claim":"Synthesis of reconstitution, structural, and genetic data across organisms established that the core TRAPP subunits including TRAPPC5 self-assemble into a stable module with GEF activity toward Ypt1/Rab1, placing TRAPPC5 in the ER-to-Golgi trafficking pathway.","evidence":"Review integrating biochemical reconstitution, structural, and genetic epistasis data from multiple groups","pmids":["27066478"],"confidence":"Medium","gaps":["Direct contribution of TRAPPC5 to GEF catalysis versus structural scaffolding not resolved","No mammalian-specific reconstitution of core TRAPP GEF activity with purified TRAPPC5"]},{"year":2022,"claim":"Cryo-EM structures of yeast TRAPPII revealed that the core module (containing the TRAPPC5 ortholog) directly contacts the Rab GTPase nucleotide-binding domain, providing the first high-resolution structural basis for TRAPP GEF activity and conformational dynamics upon substrate binding.","evidence":"Cryo-EM structure determination of TRAPPII in apo and Ypt32-bound states with mutagenesis validation","pmids":["35080977"],"confidence":"High","gaps":["Structure is of the yeast ortholog; mammalian TRAPPC5-containing TRAPP structure not yet determined","Individual contribution of TRAPPC5 versus neighboring core subunits to substrate contact not dissected by point mutagenesis"]},{"year":2022,"claim":"Endogenous tagging and live-cell imaging localized TRAPPC5 to the Golgi apparatus in human cells, directly linking its subcellular distribution to its role in Golgi-associated vesicle tethering.","evidence":"CRISPR endogenous fluorescent tagging with confocal live-cell imaging in human cells (OpenCell)","pmids":["35271311"],"confidence":"Medium","gaps":["Dynamic trafficking of TRAPPC5 between ER-Golgi intermediate compartment and cis-Golgi not resolved","Whether TRAPPC5 also localizes to TRAPPIII-specific autophagic membranes not tested"]},{"year":2022,"claim":"Functional studies in hepatocellular carcinoma demonstrated that TRAPPC5 is required for MCT4-driven cell proliferation, migration, invasion, and EMT, extending TRAPPC5's relevance beyond canonical vesicle trafficking to cancer biology.","evidence":"RNAi knockdown with proliferation, migration, invasion, EMT marker, and xenograft assays in HCC cells","pmids":["35425722"],"confidence":"Medium","gaps":["Mechanism linking TRAPPC5 vesicle-trafficking function to EMT and proliferation not defined","Whether the cancer phenotype depends on intact TRAPP complex activity or a TRAPP-independent role of TRAPPC5 is unknown","Single-lab study in one cancer type"]},{"year":null,"claim":"The specific catalytic versus scaffolding contribution of TRAPPC5 within the core TRAPP GEF module remains unresolved, and no mammalian high-resolution structure of a TRAPPC5-containing TRAPP complex has been determined.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No mammalian cryo-EM or crystal structure of TRAPPC5 in complex","No loss-of-function studies distinguishing TRAPPC5's role in TRAPPII versus TRAPPIII","No disease-causing mutations in TRAPPC5 reported"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,2]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[5]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,1,2,4,5]}],"complexes":["TRAPP complex"],"partners":["TRAPPC1","TRAPPC2","TRAPPC3","TRAPPC4","MCT4"],"other_free_text":[]},"mechanistic_narrative":"TRAPPC5 is a core subunit of the evolutionarily conserved TRAPP tethering complex that contributes to guanine nucleotide exchange factor (GEF) activity toward Rab1/Ypt1 GTPases and participates in ER-to-Golgi vesicle trafficking [PMID:27066478, PMID:35080977]. Binary interaction mapping and large-scale affinity purification–mass spectrometry confirm TRAPPC5 as an integral component of the mammalian TRAPP assembly, where it co-purifies with other core and complex-specific subunits and localizes to the Golgi apparatus [PMID:21525244, PMID:26186194, PMID:35271311]. Cryo-EM structures of the yeast TRAPPII complex show that the core module containing the TRAPPC5 ortholog directly contacts the nucleotide-binding domain of the Rab GTPase Ypt32, providing the structural basis for catalytic nucleotide exchange [PMID:35080977]. In hepatocellular carcinoma cells, TRAPPC5 is required downstream of MCT4 for cell proliferation, migration, invasion, and epithelial–mesenchymal transition, and its knockdown suppresses xenograft tumor growth [PMID:35425722]."},"prefetch_data":{"uniprot":{"accession":"Q8IUR0","full_name":"Trafficking protein particle complex subunit 5","aliases":[],"length_aa":188,"mass_kda":20.8,"function":"May play a role in vesicular transport from endoplasmic reticulum to Golgi","subcellular_location":"Golgi apparatus, cis-Golgi network; Endoplasmic reticulum","url":"https://www.uniprot.org/uniprotkb/Q8IUR0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/TRAPPC5","classification":"Common 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all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TRAPPC5"},"hgnc":{"alias_symbol":["MGC52424","TRS31"],"prev_symbol":[]},"alphafold":{"accession":"Q8IUR0","domains":[{"cath_id":"3.30.1380.20","chopping":"30-187","consensus_level":"high","plddt":89.7243,"start":30,"end":187}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IUR0","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IUR0-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IUR0-F1-predicted_aligned_error_v6.png","plddt_mean":86.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TRAPPC5","jax_strain_url":"https://www.jax.org/strain/search?query=TRAPPC5"},"sequence":{"accession":"Q8IUR0","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8IUR0.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8IUR0/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IUR0"}},"corpus_meta":[{"pmid":"35080977","id":"PMC_35080977","title":"Structural basis 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PMID:35080977 — Yeast TRAPPII cryo-EM structure (Trs20/TRAPPC4 etc.) — KEEP (TRAPP complex ortholog paper)\n2. PMID:32151258 — lncRNA lnc-TRAPPC5-1 in sepsis — EXCLUDE (alt-locus product, lncRNA)\n3. PMID:35425722 — MCT4/TRAPPC5 in HCC — KEEP (canonical TRAPPC5 protein)\n4. PMID:35401685 — Chicken keel bending GWAS — EXCLUDE (GWAS/genomic association, no mechanistic finding about TRAPPC5 protein)\n5. PMID:24929516 — trappc5 expression in mouse olfactory epithelium — KEEP (expression/downregulation finding; but only qPCR expression data, no mechanistic finding → no discovery to extract)\n\ngene2pubmed papers:\n- PMID:26186194, 28514442, 33961781 — BioPlex interactome networks (TRAPPC5 appears as interactor) — KEEP for interaction data\n- PMID:26496610 — Human interactome (HeLa GFP) — KEEP\n- PMID:25416956, 32296183 — Binary interactome maps — KEEP\n- PMID:22939629 — Census of human soluble complexes — KEEP\n- PMID:35271311 — OpenCell localization — KEEP\n- PMID:26344197 — Metazoan complexes — KEEP\n- PMID:21525244 — Mammalian TRAPP components — KEEP (directly relevant)\n- PMID:27066478 — TRAPP review — KEEP\n- PMID:12477932, 15489334 — MGC cDNA sequencing — EXCLUDE (no mechanistic finding)\n- PMID:21873635 — GO phylogenetic propagation — EXCLUDE\n- PMID:33060197, 33845483 — SARS-CoV-2 host interactions — KEEP (if TRAPPC5 specifically mentioned)\n- PMID:28319085 — CRISPR GI screen — EXCLUDE (no specific TRAPPC5 mechanism)\n- PMID:25281560, 29568061 — BioID/AP-MS methods — KEEP if TRAPPC5 data present\n- PMID:30021884 — XL-MS histones — EXCLUDE\n- PMID:33226137 — Autophagy NBR1 — EXCLUDE\n- PMID:24797263 — EGFR interactome — EXCLUDE\n- PMID:21163940 — Alzheimer interactome — EXCLUDE\n- PMID:29229926 — RECQL4 — EXCLUDE\n- PMID:34709727 — SARS-CoV-2 host proteome — KEEP\n- PMID:35256949 — Parkin/mitophagy — EXCLUDE\n- PMID:31515488 — SNV interaction disruption — EXCLUDE (no specific TRAPPC5 mechanism)\n- PMID:35384245 — RTK interactome — EXCLUDE\n- PMID:8889548 — cDNA library normalization — EXCLUDE\n- PMID:30833792 — ISG interactome — KEEP if TRAPPC5 mentioned\n\nNow extracting mechanistic discoveries from KEPT papers with actual mechanistic content about TRAPPC5:\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2011,\n      \"finding\": \"TRAPPC5 (along with other core subunits) is a component of the mammalian TRAPP tethering complex. Binary interaction mapping of all known mammalian TRAPP components placed TRAPPC5 within the core TRAPP assembly, and evidence was presented that mammalian TRAPP does not form a TRAPPI-equivalent sub-complex as in yeast, suggesting the fundamental unit of mammalian TRAPP differs from the yeast counterpart.\",\n      \"method\": \"Co-immunoprecipitation, binary interaction mapping, and functional complementation assays across all known mammalian TRAPP subunits\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP binary interaction map, single lab study\",\n      \"pmids\": [\"21525244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TRAPPC5 is identified as a core TRAPP subunit conserved from yeast to humans. Core TRAPP subunits, including the TRAPPC5 homolog, self-assemble into a stable complex with guanine nucleotide exchange factor (GEF) activity toward Ypt1/Rab1, placing TRAPPC5 in the pathway of ER-to-Golgi vesicle tethering and Rab GTPase activation.\",\n      \"method\": \"Review synthesizing biochemical reconstitution, structural, and genetic epistasis data from the TRAPP field\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — synthesis of reconstitution and structural data from multiple labs; review article\",\n      \"pmids\": [\"27066478\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cryo-EM structures of yeast TRAPPII (which contains the TRAPPC5 ortholog as part of core TRAPP) in apo and Ypt32-bound states reveal a dimeric architecture. The core TRAPP module (including the TRAPPC5 ortholog) directly contacts the nucleotide-binding domain of Ypt32, providing the structural basis for GEF activity, while TRAPPII-specific subunit Trs120 also contacts Ypt32. The monomer transitions between open and closed conformations upon Ypt32 binding.\",\n      \"method\": \"Cryo-EM structure determination combined with functional GEF activity assays and mutagenesis\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structure with functional validation and mutagenesis in same study\",\n      \"pmids\": [\"35080977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TRAPPC5 expression is regulated downstream of MCT4 (monocarboxylate transporter 4) in hepatocellular carcinoma cells. Knockdown of TRAPPC5 reduced HCC cell proliferation, migration, invasion, and epithelial-mesenchymal transition (EMT), and suppressed tumor growth in xenograft models, placing TRAPPC5 as a functionally required downstream effector of MCT4-driven HCC progression.\",\n      \"method\": \"RNA interference knockdown of TRAPPC5, CCK-8 proliferation assay, colony formation, transwell/wound-healing migration/invasion assays, western blot for EMT markers, xenograft tumor growth assay\",\n      \"journal\": \"Journal of hepatocellular carcinoma\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular phenotype across multiple orthogonal assays, single lab\",\n      \"pmids\": [\"35425722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"High-throughput affinity purification-mass spectrometry (BioPlex) identified TRAPPC5 as part of a protein community corresponding to the TRAPP complex in human HEK293T cells, confirming its membership in the endogenous human TRAPP complex and its co-complex associations with other TRAPP subunits.\",\n      \"method\": \"High-throughput affinity purification coupled to mass spectrometry (AP-MS) in HEK293T cells\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — large-scale AP-MS, multiple TRAPP subunits co-purified, independently reproduced in BioPlex 2.0 and 3.0\",\n      \"pmids\": [\"26186194\", \"28514442\", \"33961781\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"OpenCell endogenous tagging and live-cell imaging localized TRAPPC5 to the Golgi apparatus in human cells, consistent with its role as a TRAPP complex subunit involved in vesicle tethering at the Golgi.\",\n      \"method\": \"Endogenous CRISPR tagging with fluorescent protein followed by confocal live-cell imaging and AP-MS interaction profiling\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct endogenous localization experiment with functional context from co-complex data\",\n      \"pmids\": [\"35271311\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TRAPPC5 is a core subunit of the evolutionarily conserved TRAPP tethering complex, where it contributes to the GEF activity toward Rab1/Ypt1 GTPases and participates in ER-to-Golgi vesicle tethering; it localizes to the Golgi apparatus, is incorporated into higher-order TRAPPII and TRAPPIII complexes, and in cancer contexts functions downstream of MCT4 to promote hepatocellular carcinoma cell proliferation, migration, invasion, and EMT.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TRAPPC5 is a core subunit of the TRAPP tethering complex, which functions as a guanine nucleotide exchange factor (GEF) for Rab/Ypt GTPases involved in vesicle trafficking; cryo-EM structures of yeast TRAPPII show that TRAPPC5-containing core TRAPP assembles into a dimeric architecture that contacts Ypt32 to enable specific GEF activation [PMID:35080977]. In hepatocellular carcinoma cells, TRAPPC5 knockdown reduces proliferation, migration, invasion, and epithelial-mesenchymal transition, and suppresses xenograft tumor growth downstream of MCT4 [PMID:35425722].\",\n  \"teleology\": [\n    {\n      \"year\": 2022,\n      \"claim\": \"Cryo-EM visualization of yeast TRAPPII resolved how the core TRAPP subunits (including the TRAPPC5 ortholog) assemble into a dimeric complex and engage the Rab GTPase Ypt32, establishing the structural basis for TRAPPII-specific GEF activity.\",\n      \"evidence\": \"Cryo-EM of apo and Ypt32-bound TRAPPII combined with in vitro GEF assays in yeast\",\n      \"pmids\": [\"35080977\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"TRAPPC5's individual contribution to complex integrity or GEF activity was not isolated from the other core subunits\",\n        \"No mammalian TRAPPII structure with TRAPPC5 resolved\",\n        \"Functional consequences of TRAPPC5 loss on TRAPPII assembly not tested\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Loss-of-function experiments in hepatocellular carcinoma cells established that TRAPPC5 is required for tumor cell proliferation, migration, invasion, and EMT, positioning it as a functional effector downstream of the lactate transporter MCT4.\",\n      \"evidence\": \"siRNA knockdown in HCC cell lines with CCK-8, colony formation, transwell, wound-healing assays, and xenograft models\",\n      \"pmids\": [\"35425722\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism linking TRAPPC5 to EMT or MCT4 signaling is undefined\",\n        \"Findings from a single laboratory; independent replication lacking\",\n        \"Whether the cancer phenotype depends on TRAPPC5's role in TRAPP-mediated vesicle trafficking is untested\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The specific molecular contribution of TRAPPC5 within the TRAPP complex — whether it is essential for complex stability, GEF catalysis, or cargo selectivity — and how its vesicle-trafficking role connects to the observed cancer phenotypes remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No loss-of-function study in a non-cancer context to define TRAPPC5's fundamental cell-biological role\",\n        \"No direct binding partners of TRAPPC5 individually characterized\",\n        \"No disease-associated mutations reported\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"complexes\": [\"TRAPPII\"],\n    \"partners\": [\"MCT4\"],\n    \"other_free_text\": []\n  }\n}\n```\n\nWait, I need to fix the pathway — it should use Reactome IDs, not GO IDs. Let me correct:\n\n```json\n{\n  \"mechanistic_narrative\": \"TRAPPC5 is a core subunit of the TRAPP tethering complex, which functions as a guanine nucleotide exchange factor (GEF) for Rab/Ypt GTPases involved in vesicle trafficking; cryo-EM structures of yeast TRAPPII show that TRAPPC5-containing core TRAPP assembles into a dimeric architecture that contacts Ypt32 to enable specific GEF activation [PMID:35080977]. In hepatocellular carcinoma cells, TRAPPC5 knockdown reduces proliferation, migration, invasion, and epithelial-mesenchymal transition, and suppresses xenograft tumor growth downstream of MCT4 [PMID:35425722].\",\n  \"teleology\": [\n    {\n      \"year\": 2022,\n      \"claim\": \"Cryo-EM visualization of yeast TRAPPII resolved how the core TRAPP subunits (including the TRAPPC5 ortholog) assemble into a dimeric complex and engage the Rab GTPase Ypt32, establishing the structural basis for TRAPPII-specific GEF activity.\",\n      \"evidence\": \"Cryo-EM of apo and Ypt32-bound TRAPPII combined with in vitro GEF assays in yeast\",\n      \"pmids\": [\"35080977\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"TRAPPC5's individual contribution to complex integrity or GEF activity was not isolated from other core subunits\",\n        \"No mammalian TRAPPII structure with TRAPPC5 resolved\",\n        \"Functional consequences of TRAPPC5 loss on TRAPPII assembly not tested\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Loss-of-function experiments in hepatocellular carcinoma cells established that TRAPPC5 is required for tumor cell proliferation, migration, invasion, and EMT, positioning it as a functional effector downstream of the lactate transporter MCT4.\",\n      \"evidence\": \"siRNA knockdown in HCC cell lines with CCK-8, colony formation, transwell, wound-healing assays, and xenograft models\",\n      \"pmids\": [\"35425722\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism linking TRAPPC5 to EMT or MCT4 signaling is undefined\",\n        \"Findings from a single laboratory; independent replication lacking\",\n        \"Whether the cancer phenotype depends on TRAPPC5's role in TRAPP-mediated vesicle trafficking is untested\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The specific molecular contribution of TRAPPC5 within the TRAPP complex — whether it is essential for complex stability, GEF catalysis, or cargo selectivity — and how its vesicle-trafficking role connects to the observed cancer phenotypes remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No loss-of-function study in a non-cancer context to define TRAPPC5's fundamental cell-biological role\",\n        \"No direct binding partners of TRAPPC5 individually characterized\",\n        \"No disease-associated mutations reported\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"complexes\": [\"TRAPPII\"],\n    \"partners\": [\"MCT4\"],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"TRAPPC5 is a core subunit of the evolutionarily conserved TRAPP tethering complex that contributes to guanine nucleotide exchange factor (GEF) activity toward Rab1/Ypt1 GTPases and participates in ER-to-Golgi vesicle trafficking [PMID:27066478, PMID:35080977]. Binary interaction mapping and large-scale affinity purification–mass spectrometry confirm TRAPPC5 as an integral component of the mammalian TRAPP assembly, where it co-purifies with other core and complex-specific subunits and localizes to the Golgi apparatus [PMID:21525244, PMID:26186194, PMID:35271311]. Cryo-EM structures of the yeast TRAPPII complex show that the core module containing the TRAPPC5 ortholog directly contacts the nucleotide-binding domain of the Rab GTPase Ypt32, providing the structural basis for catalytic nucleotide exchange [PMID:35080977]. In hepatocellular carcinoma cells, TRAPPC5 is required downstream of MCT4 for cell proliferation, migration, invasion, and epithelial–mesenchymal transition, and its knockdown suppresses xenograft tumor growth [PMID:35425722].\",\n  \"teleology\": [\n    {\n      \"year\": 2011,\n      \"claim\": \"Binary interaction mapping established that TRAPPC5 is embedded within the core mammalian TRAPP assembly and that mammalian TRAPP does not recapitulate the yeast TRAPPI sub-complex architecture, redefining the minimal functional unit of mammalian TRAPP.\",\n      \"evidence\": \"Co-immunoprecipitation and binary interaction mapping of all known mammalian TRAPP subunits\",\n      \"pmids\": [\"21525244\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No direct structural data on TRAPPC5 contacts within the mammalian TRAPP assembly\",\n        \"Single-lab study without independent replication at the time\"\n      ]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Large-scale affinity purification–mass spectrometry independently confirmed TRAPPC5 as a component of the endogenous human TRAPP complex, validating earlier binary mapping data with an orthogonal proteomics approach.\",\n      \"evidence\": \"AP-MS (BioPlex) in HEK293T cells, reproduced across BioPlex 2.0 and 3.0 datasets\",\n      \"pmids\": [\"26186194\", \"28514442\", \"33961781\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Stoichiometry and copy number of TRAPPC5 within the complex not determined\",\n        \"No functional readout beyond co-purification\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Synthesis of reconstitution, structural, and genetic data across organisms established that the core TRAPP subunits including TRAPPC5 self-assemble into a stable module with GEF activity toward Ypt1/Rab1, placing TRAPPC5 in the ER-to-Golgi trafficking pathway.\",\n      \"evidence\": \"Review integrating biochemical reconstitution, structural, and genetic epistasis data from multiple groups\",\n      \"pmids\": [\"27066478\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct contribution of TRAPPC5 to GEF catalysis versus structural scaffolding not resolved\",\n        \"No mammalian-specific reconstitution of core TRAPP GEF activity with purified TRAPPC5\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Cryo-EM structures of yeast TRAPPII revealed that the core module (containing the TRAPPC5 ortholog) directly contacts the Rab GTPase nucleotide-binding domain, providing the first high-resolution structural basis for TRAPP GEF activity and conformational dynamics upon substrate binding.\",\n      \"evidence\": \"Cryo-EM structure determination of TRAPPII in apo and Ypt32-bound states with mutagenesis validation\",\n      \"pmids\": [\"35080977\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structure is of the yeast ortholog; mammalian TRAPPC5-containing TRAPP structure not yet determined\",\n        \"Individual contribution of TRAPPC5 versus neighboring core subunits to substrate contact not dissected by point mutagenesis\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Endogenous tagging and live-cell imaging localized TRAPPC5 to the Golgi apparatus in human cells, directly linking its subcellular distribution to its role in Golgi-associated vesicle tethering.\",\n      \"evidence\": \"CRISPR endogenous fluorescent tagging with confocal live-cell imaging in human cells (OpenCell)\",\n      \"pmids\": [\"35271311\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Dynamic trafficking of TRAPPC5 between ER-Golgi intermediate compartment and cis-Golgi not resolved\",\n        \"Whether TRAPPC5 also localizes to TRAPPIII-specific autophagic membranes not tested\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Functional studies in hepatocellular carcinoma demonstrated that TRAPPC5 is required for MCT4-driven cell proliferation, migration, invasion, and EMT, extending TRAPPC5's relevance beyond canonical vesicle trafficking to cancer biology.\",\n      \"evidence\": \"RNAi knockdown with proliferation, migration, invasion, EMT marker, and xenograft assays in HCC cells\",\n      \"pmids\": [\"35425722\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism linking TRAPPC5 vesicle-trafficking function to EMT and proliferation not defined\",\n        \"Whether the cancer phenotype depends on intact TRAPP complex activity or a TRAPP-independent role of TRAPPC5 is unknown\",\n        \"Single-lab study in one cancer type\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The specific catalytic versus scaffolding contribution of TRAPPC5 within the core TRAPP GEF module remains unresolved, and no mammalian high-resolution structure of a TRAPPC5-containing TRAPP complex has been determined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No mammalian cryo-EM or crystal structure of TRAPPC5 in complex\",\n        \"No loss-of-function studies distinguishing TRAPPC5's role in TRAPPII versus TRAPPIII\",\n        \"No disease-causing mutations in TRAPPC5 reported\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 1, 2, 4, 5]}\n    ],\n    \"complexes\": [\n      \"TRAPP complex\"\n    ],\n    \"partners\": [\n      \"TRAPPC1\",\n      \"TRAPPC2\",\n      \"TRAPPC3\",\n      \"TRAPPC4\",\n      \"MCT4\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}