{"gene":"TRAPPC8","run_date":"2026-04-28T21:42:59","timeline":{"discoveries":[{"year":2000,"finding":"Trs85p was identified as one of five novel subunits of the yeast TRAPP complex, and biochemical characterization showed the complex (including its human homologue) is anchored to a Triton X-100-resistant fraction of the Golgi, implicating TRAPP in ER-to-Golgi vesicle tethering.","method":"Biochemical purification, mass spectrometry, subcellular fractionation","journal":"European journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 — original identification by purification and fractionation, single lab","pmids":["10727015"],"is_preprint":false},{"year":2005,"finding":"Trs85 (Gsg1) is required for the biogenesis of Cvt vesicles and for selective autophagy via the Cvt pathway in S. cerevisiae; trs85Δ cells show defective organization of the preautophagosomal structure and impaired recruitment of GFP-Atg8 to the PAS, while general autophagy proceeds at a reduced rate, indicating a specific role in pre-autophagosomal structure organization.","method":"Genetic deletion, fluorescence microscopy (GFP-Atg8 localization), electron microscopy, biochemical assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (EM, fluorescence microscopy, biochemical assays), replicated in two independent 2005 studies","pmids":["16079147"],"is_preprint":false},{"year":2005,"finding":"Trs85 is required for macroautophagy, pexophagy, and the cytoplasm-to-vacuole targeting (Cvt) pathway in both Yarrowia lipolytica and Saccharomyces cerevisiae, establishing its conserved role in multiple selective and non-selective autophagy routes.","method":"Genetic screen, deletion mutant analysis, selective autophagy assays in two yeast species","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 — independently replicated in two yeast species by two groups in the same year","pmids":["16874038"],"is_preprint":false},{"year":2011,"finding":"TRAPPC8 (KIAA1012) was identified as the mammalian homologue of yeast Trs85p and confirmed as a bona fide component of human TRAPP; binary interaction mapping showed TRAPPC8 is part of the mammalian TRAPPIII-equivalent complex, and the study established that mammalian TRAPP lacks a TRAPPI-equivalent, with TRAPPC8 and TRAPPC11 being novel components.","method":"Co-immunoprecipitation, binary interaction mapping, mass spectrometry, fluorescence microscopy","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods, comprehensive binary interaction map of all mammalian TRAPP subunits","pmids":["21525244"],"is_preprint":false},{"year":2011,"finding":"TRAPPC2 serves as an adaptor for the formation of mammalian TRAPPIII by directly binding TRAPPC8; endogenous TRAPPC9-positive TRAPPII complex does not contain TRAPPC8, establishing that TRAPPC2 binds either TRAPPC9 (for TRAPPII) or TRAPPC8 (for TRAPPIII) in a mutually exclusive manner. A disease-causing mutation D47Y in TRAPPC2 abrogated interaction with TRAPPC8.","method":"Co-immunoprecipitation in mammalian cells, disease mutant analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal co-IP with disease mutant validation, single lab","pmids":["21858081"],"is_preprint":false},{"year":2011,"finding":"Trs85 is not associated with the yeast TRAPPII complex but proteins related to Trs85 (TRAPPC8) are part of the same TRAPP complex as Trs65 and Tca17 homologues in mammalian cells, indicating a reorganization of TRAPP complex architecture between yeast and mammals.","method":"Affinity purification, mass spectrometry, co-immunoprecipitation in yeast and mammalian cells","journal":"Traffic (Copenhagen, Denmark)","confidence":"Medium","confidence_rationale":"Tier 2 — comparative biochemical analysis across species, single lab","pmids":["21453443"],"is_preprint":false},{"year":2012,"finding":"Trs85 directly interacts with Atg9 and the Trs85-containing TRAPPIII complex facilitates the association of the Rab GTPase Ypt1 onto Atg9 vesicles; Trs85 and Ypt1 localize to the preautophagosomal structure in an Atg9-dependent manner, placing TRAPPIII downstream of Atg9 in autophagosome formation.","method":"Atg9 vesicle purification, mass spectrometry, direct interaction assay, fluorescence microscopy","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — vesicle purification + direct interaction + localization with genetic dependency, multiple orthogonal methods","pmids":["23129774"],"is_preprint":false},{"year":2013,"finding":"TRAPPC8 specifically interacts with HPV L2 capsid protein (MaL2) and is exposed on the cell surface where it colocalizes with inoculated HPV pseudovirions; TRAPPC8 knockdown in HeLa and HaCaT cells reduced susceptibility to HPV51, HPV16, and HPV31 infection independently of L2 interaction, and TRAPPC8 depletion caused dispersal of Golgi stack structure—a phenotype also induced by GFP-L2 overexpression—suggesting that L2 binding to TRAPPC8 inhibits its Golgi maintenance function to facilitate viral escape from the trans-Golgi network.","method":"Co-immunoprecipitation, siRNA knockdown, immunofluorescence microscopy, infection assays with authentic virions and pseudovirions","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods (Co-IP, KD phenotype, authentic virus infection), single lab","pmids":["24244674"],"is_preprint":false},{"year":2014,"finding":"TRAPPC8 was identified as containing conserved C-terminal ASH (ASPM, SPD-2, Hydin) domains and N-terminal α-solenoid/TPR repeats by computational analysis; endogenous TRAPPC8 localizes to the centrosome/basal body by immunofluorescence microscopy, and depletion of TRAPPC8 impairs ciliogenesis and prevents GFP-Rabin8 targeting to the centrosome, establishing TRAPPC8 as a ciliogenesis factor acting at the centrosome.","method":"Computational domain prediction, immunofluorescence microscopy of endogenous protein, siRNA knockdown with ciliogenesis and centrosome-targeting readouts","journal":"Cilia","confidence":"Medium","confidence_rationale":"Tier 2–3 — localization tied to functional consequence (ciliogenesis, Rabin8 targeting), single lab","pmids":["25018876"],"is_preprint":false},{"year":2015,"finding":"TRAPPC8 is the mammalian orthologue of the yeast autophagy-specific TRAPP subunit Trs85 and forms part of a mammalian TRAPPIII-like complex; TRAPPC8 and TBC1D14 both regulate ATG9 trafficking and RAB1 activation independently of ULK1, and TRAPPC8 is required for TBC1D14 to bind TRAPPIII. Overexpression of TBC1D14's TRAPP-binding domain inhibits both autophagy and secretory traffic, placing TRAPPIII (containing TRAPPC8) at a constitutive trafficking step from peripheral recycling endosomes to the early Golgi.","method":"Co-immunoprecipitation, siRNA knockdown, ATG9 trafficking assays, RAB1 activation assays, autophagy flux assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including RAB1 GEF activity, ATG9 trafficking, and epistasis with ULK1, replicated with multiple readouts","pmids":["26711178"],"is_preprint":false},{"year":2020,"finding":"TRAPPC8 interacts with the ciliopathy protein OFD1 and is necessary for the association of OFD1 with pericentriolar material 1 (PCM1); TRAPPC8 depletion reduces colocalization of OFD1 and PCM1 without compromising centriolar satellite structural integrity. The interaction between TRAPPC8 and OFD1 is mutually inhibitory with that between OFD1 and TRAPPC12, explaining differential cilium length phenotypes: TRAPPC8 depletion reduces cilium assembly while TRAPPC12 depletion (which blocks cilia disassembly) increases cilium length.","method":"Co-immunoprecipitation, siRNA knockdown, immunofluorescence microscopy, cilia length measurements in hTERT-RPE1 cells","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal Co-IP with functional epistasis between TRAPPC8 and TRAPPC12, single lab","pmids":["32258032"],"is_preprint":false}],"current_model":"TRAPPC8 (mammalian orthologue of yeast Trs85) is the defining subunit of the TRAPPIII tethering complex, where it is recruited to the complex via TRAPPC2 in a mutually exclusive manner with TRAPPC9/TRAPPII; TRAPPC8-containing TRAPPIII acts as a GEF for RAB1/Ypt1, regulates ATG9 trafficking between peripheral recycling endosomes and the early Golgi to support autophagosome initiation, and at the centrosome/basal body promotes ciliogenesis by facilitating OFD1–PCM1 association and Rabin8 centrosome targeting."},"narrative":{"teleology":[{"year":2000,"claim":"Identification of Trs85p as a TRAPP complex subunit established that the complex has additional components beyond the minimal core and is anchored to Golgi membranes for ER-to-Golgi tethering.","evidence":"Biochemical purification, mass spectrometry, and subcellular fractionation in yeast","pmids":["10727015"],"confidence":"Medium","gaps":["Specific function of Trs85 within TRAPP was not resolved","No mammalian homologue identified at this stage"]},{"year":2005,"claim":"Demonstrating that Trs85 is required for the Cvt pathway, pexophagy, and macroautophagy in two yeast species established a conserved, specific role for this TRAPP subunit in autophagy-related membrane trafficking.","evidence":"Genetic deletion, GFP-Atg8 fluorescence microscopy, electron microscopy, and selective autophagy assays in S. cerevisiae and Y. lipolytica","pmids":["16079147","16874038"],"confidence":"High","gaps":["Mechanism by which Trs85 promotes PAS organization was unknown","Whether this autophagy role is conserved in mammals was untested"]},{"year":2011,"claim":"Identification of TRAPPC8 as the mammalian Trs85 orthologue and demonstration that TRAPPC2 bridges TRAPPC8 into a TRAPPIII complex mutually exclusive with TRAPPC9-containing TRAPPII resolved the architecture of mammalian TRAPP complexes.","evidence":"Binary interaction mapping, co-immunoprecipitation, mass spectrometry, and disease mutant analysis (TRAPPC2-D47Y) in mammalian cells","pmids":["21525244","21858081","21453443"],"confidence":"High","gaps":["Whether mammalian TRAPPIII retains GEF activity for Rab1/Ypt1 was not yet shown","Structural basis for mutual exclusivity of TRAPPC8 and TRAPPC9 binding to TRAPPC2 was unresolved"]},{"year":2012,"claim":"Showing that Trs85 directly interacts with Atg9 and loads Ypt1 onto Atg9 vesicles placed TRAPPIII as a Rab-GEF acting downstream of Atg9 in autophagosome nucleation.","evidence":"Atg9 vesicle purification, direct interaction assay, mass spectrometry, and fluorescence microscopy in yeast","pmids":["23129774"],"confidence":"High","gaps":["Whether mammalian TRAPPC8 similarly interacts with ATG9 was not tested","Mechanism by which TRAPPIII recognizes Atg9 vesicles versus other membrane carriers was unclear"]},{"year":2013,"claim":"Discovery that TRAPPC8 is required for Golgi integrity and is exploited by HPV L2 during infection revealed an unexpected role in maintaining Golgi structure and a viral subversion mechanism.","evidence":"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, and infection assays with authentic HPV virions in HeLa/HaCaT cells","pmids":["24244674"],"confidence":"Medium","gaps":["Cell-surface exposure of TRAPPC8 was unexpected and awaits independent confirmation","Whether Golgi dispersal is a direct consequence of TRAPPC8 loss or secondary to trafficking defects was not distinguished"]},{"year":2014,"claim":"Localization of endogenous TRAPPC8 to the centrosome/basal body and demonstration that its depletion blocks Rabin8 targeting and ciliogenesis extended TRAPPIII function beyond Golgi trafficking to the primary cilium.","evidence":"Immunofluorescence of endogenous protein, siRNA knockdown with ciliogenesis and Rabin8 centrosome-targeting readouts in mammalian cells","pmids":["25018876"],"confidence":"Medium","gaps":["Which TRAPPC8 domain mediates centrosome localization was not mapped","Whether TRAPPC8's ciliogenesis role requires its GEF-associated activity was untested"]},{"year":2015,"claim":"Establishing that TRAPPC8-containing TRAPPIII acts as a RAB1 GEF regulating ATG9 trafficking from recycling endosomes to the early Golgi, independently of ULK1, unified the yeast autophagy findings with mammalian membrane trafficking and autophagy pathways.","evidence":"RAB1 activation assays, ATG9 trafficking assays, autophagy flux measurements, co-immunoprecipitation, and epistasis experiments with ULK1 and TBC1D14","pmids":["26711178"],"confidence":"High","gaps":["Whether TRAPPIII's constitutive secretory role is separable from its autophagy-specific role at the molecular level was not resolved","Structural basis for TBC1D14–TRAPPIII interaction was not determined"]},{"year":2020,"claim":"Showing that TRAPPC8 bridges OFD1 to PCM1 and competes with TRAPPC12 for OFD1 binding provided a molecular mechanism for how TRAPPIII promotes cilium assembly while TRAPPC12 opposes cilium disassembly.","evidence":"Reciprocal co-immunoprecipitation, siRNA knockdown, immunofluorescence, and cilia length measurements in hTERT-RPE1 cells","pmids":["32258032"],"confidence":"Medium","gaps":["Whether TRAPPC8–OFD1 interaction is direct or requires other centriolar satellite components was not established","In vivo consequences of TRAPPC8 loss for cilium-related signaling pathways (e.g., Hedgehog) were not examined"]},{"year":null,"claim":"It remains unresolved how TRAPPC8's dual functions at the Golgi/recycling endosome (autophagy, secretion) and the centrosome (ciliogenesis) are spatiotemporally coordinated, and no high-resolution structure of mammalian TRAPPIII incorporating TRAPPC8 has been reported.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of full-length mammalian TRAPPIII","Mechanism coordinating TRAPPC8's roles in autophagy versus ciliogenesis is unknown","Whether TRAPPC8 mutations cause a human Mendelian disease has not been established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,4,9]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[6,9]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[0,7]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[8,10]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[9]}],"pathway":[{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[1,2,6,9]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,3,9]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[8,10]}],"complexes":["TRAPPIII"],"partners":["TRAPPC2","TRAPPC9","OFD1","PCM1","TBC1D14","ATG9"],"other_free_text":[]},"mechanistic_narrative":"TRAPPC8 is the defining subunit of the mammalian TRAPPIII tethering complex, linking vesicle trafficking to autophagosome biogenesis and ciliogenesis. TRAPPC8 is recruited to the TRAPP core via TRAPPC2 in a mutually exclusive manner with TRAPPC9/TRAPPII, and the resulting TRAPPIII complex functions as a GEF for RAB1, regulating ATG9 trafficking from peripheral recycling endosomes to the early Golgi to support autophagosome initiation independently of ULK1 [PMID:26711178, PMID:23129774]. At the centrosome/basal body, TRAPPC8 promotes ciliogenesis by facilitating Rabin8 centrosome targeting and the association of OFD1 with PCM1 [PMID:25018876, PMID:32258032]. TRAPPC8 also maintains Golgi stack integrity, a function exploited by HPV L2 capsid protein binding to TRAPPC8 to disrupt Golgi organization during viral infection [PMID:24244674]."},"prefetch_data":{"uniprot":{"accession":"Q9Y2L5","full_name":"Trafficking protein particle complex subunit 8","aliases":["Protein TRS85 homolog"],"length_aa":1435,"mass_kda":161.0,"function":"Plays a role in endoplasmic reticulum to Golgi apparatus trafficking at a very early stage (PubMed:21525244). Maintains together with TBC1D14 the cycling pool of ATG9 required for initiation of autophagy (PubMed:26711178). Involved in collagen secretion (PubMed:32095531)","subcellular_location":"Golgi apparatus, cis-Golgi network","url":"https://www.uniprot.org/uniprotkb/Q9Y2L5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/TRAPPC8","classification":"Common Essential","n_dependent_lines":1192,"n_total_lines":1208,"dependency_fraction":0.9867549668874173},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"TRAPPC1","stoichiometry":10.0},{"gene":"TRAPPC11","stoichiometry":10.0},{"gene":"TRAPPC2","stoichiometry":10.0},{"gene":"ACTR2","stoichiometry":0.2},{"gene":"ARL3","stoichiometry":0.2},{"gene":"ARL8B","stoichiometry":0.2},{"gene":"KRAS","stoichiometry":0.2},{"gene":"MIS12","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/TRAPPC8","total_profiled":1310},"omim":[{"mim_id":"614781","title":"TECTONIN BETA-PROPELLER REPEAT-CONTAINING 1; TECPR1","url":"https://www.omim.org/entry/614781"},{"mim_id":"614136","title":"TRAFFICKING PROTEIN PARTICLE COMPLEX, SUBUNIT 8; TRAPPC8","url":"https://www.omim.org/entry/614136"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"},{"location":"Microtubules","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TRAPPC8"},"hgnc":{"alias_symbol":["HsT2706","TRS85","GSG1"],"prev_symbol":["KIAA1012"]},"alphafold":{"accession":"Q9Y2L5","domains":[{"cath_id":"3.40.50,3.40.50","chopping":"2-80_144-234_338-379","consensus_level":"medium","plddt":89.6565,"start":2,"end":379},{"cath_id":"2.60.40,2.60.40","chopping":"670-681_736-785_800-848_868-909","consensus_level":"high","plddt":90.8906,"start":670,"end":909},{"cath_id":"2.60.40.10","chopping":"1304-1435","consensus_level":"high","plddt":78.5443,"start":1304,"end":1435},{"cath_id":"1.20.58","chopping":"412-517","consensus_level":"medium","plddt":90.6266,"start":412,"end":517}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y2L5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y2L5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y2L5-F1-predicted_aligned_error_v6.png","plddt_mean":78.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TRAPPC8","jax_strain_url":"https://www.jax.org/strain/search?query=TRAPPC8"},"sequence":{"accession":"Q9Y2L5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y2L5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y2L5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y2L5"}},"corpus_meta":[{"pmid":"23129774","id":"PMC_23129774","title":"Atg9 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XIII. The complete sequences of 100 new cDNA clones from brain which code for large proteins in vitro.","date":"1999","source":"DNA research : an international journal for rapid publication of reports on genes and genomes","url":"https://pubmed.ncbi.nlm.nih.gov/10231032","citation_count":112,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"10727015","id":"PMC_10727015","title":"Identification and characterization of five new subunits of TRAPP.","date":"2000","source":"European journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/10727015","citation_count":105,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21525244","id":"PMC_21525244","title":"C4orf41 and TTC-15 are mammalian TRAPP components with a role at an early stage in ER-to-Golgi trafficking.","date":"2011","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/21525244","citation_count":105,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"27066478","id":"PMC_27066478","title":"TRAPP Complexes in Secretion and Autophagy.","date":"2016","source":"Frontiers in cell and developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/27066478","citation_count":96,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"22990118","id":"PMC_22990118","title":"Charting the landscape of tandem BRCT domain-mediated protein interactions.","date":"2012","source":"Science signaling","url":"https://pubmed.ncbi.nlm.nih.gov/22990118","citation_count":92,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"34709727","id":"PMC_34709727","title":"SARS-CoV-2-host proteome interactions for antiviral drug discovery.","date":"2021","source":"Molecular systems biology","url":"https://pubmed.ncbi.nlm.nih.gov/34709727","citation_count":86,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"35256949","id":"PMC_35256949","title":"Histone deacetylase inhibitors inhibit cervical cancer growth through Parkin acetylation-mediated mitophagy.","date":"2021","source":"Acta pharmaceutica Sinica. B","url":"https://pubmed.ncbi.nlm.nih.gov/35256949","citation_count":66,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"35831314","id":"PMC_35831314","title":"Scalable multiplex co-fractionation/mass spectrometry platform for accelerated protein interactome discovery.","date":"2022","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/35831314","citation_count":65,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"33957083","id":"PMC_33957083","title":"Comprehensive interactome profiling of the human Hsp70 network highlights functional differentiation of J domains.","date":"2021","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/33957083","citation_count":64,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21453443","id":"PMC_21453443","title":"Organization and assembly of the TRAPPII complex.","date":"2011","source":"Traffic (Copenhagen, Denmark)","url":"https://pubmed.ncbi.nlm.nih.gov/21453443","citation_count":62,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"25921289","id":"PMC_25921289","title":"Temporal proteomics of NGF-TrkA signaling identifies an inhibitory role for the E3 ligase Cbl-b in neuroblastoma cell differentiation.","date":"2015","source":"Science signaling","url":"https://pubmed.ncbi.nlm.nih.gov/25921289","citation_count":61,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21858081","id":"PMC_21858081","title":"The adaptor function of TRAPPC2 in mammalian TRAPPs explains TRAPPC2-associated SEDT and TRAPPC9-associated congenital intellectual disability.","date":"2011","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/21858081","citation_count":54,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":7153,"output_tokens":933,"usd":0.017727},"stage2":{"model":"claude-opus-4-6","input_tokens":4130,"output_tokens":1332,"usd":0.080925},"total_usd":0.296151,"stage1_batch_id":"msgbatch_01RPbVc9PDH9zQmYK5Hs6srm","stage2_batch_id":"msgbatch_01JVbVLzeKN2yVrsGp3zC8aM","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":19761,"output_tokens":3901,"usd":0.058899},"round2_rules_fired":"R2,R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":6495,"output_tokens":2397,"usd":0.1386}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2014,\n      \"finding\": \"TRAPPC8 contains a C-terminal ASH (ASPM, SPD-2, Hydin) domain and an N-terminal α-solenoid with TPR repeats; endogenous TRAPPC8 localizes to the centrosome/basal body, and depletion of TRAPPC8 impairs ciliogenesis and GFP-Rabin8 centrosome targeting.\",\n      \"method\": \"Bioinformatic domain prediction, immunofluorescence microscopy of endogenous TRAPPC8, siRNA knockdown with ciliogenesis and Rabin8-targeting readouts\",\n      \"journal\": \"Cilia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiment with functional consequence (ciliogenesis defect, Rabin8 mistargeting) in a single study\",\n      \"pmids\": [\"25018876\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TRAPPC8 physically interacts with HPV L2 capsid protein and is required for HPV cell entry; TRAPPC8 protein is exposed on the cell surface and colocalizes with inoculated pseudovirions; TRAPPC8 knockdown impairs HPV endocytosis independently of L2 interaction, and overexpression of L2 (which binds TRAPPC8) causes Golgi dispersal mimicking TRAPPC8 knockdown.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence microscopy, siRNA knockdown with reporter gene (transduction efficiency) and Golgi morphology readouts, authentic HPV31 infection assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal interaction shown, functional knockdown with multiple orthogonal readouts in a single study\",\n      \"pmids\": [\"24244674\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRAPPC8 (a TRAPPIII-specific subunit) interacts with the ciliopathy protein OFD1 and is required for OFD1 association with pericentriolar material 1 (PCM1); TRAPPC8 depletion reduces OFD1–PCM1 colocalization without disrupting centriolar satellite structural integrity, and TRAPPC8–OFD1 interaction is mutually exclusive with the OFD1–TRAPPC12 interaction, indicating distinct roles of TRAPPIII subunits in ciliogenesis.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, immunofluorescence microscopy of OFD1/PCM1 colocalization, cilium length measurements in hTERT-RPE1 cells\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with defined functional consequence (OFD1 mistargeting) and epistatic relationship between TRAPPC8 and TRAPPC12 interactions\",\n      \"pmids\": [\"32258032\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TRAPPC8 is a large TRAPPIII-specific subunit bearing an ASH domain and TPR repeats that localizes to the centrosome/basal body, where it promotes ciliogenesis by facilitating OFD1–PCM1 association and Rabin8 centrosome targeting, and also functions in endocytic trafficking required for HPV cell entry by interacting with the viral L2 capsid protein at the cell surface.\"\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**KEEP (about canonical TRAPPC8/Trs85 in relevant organisms):**\n- [1] PMID:23129774 — Trs85/TRAPPIII in yeast autophagy (ortholog, KEEP)\n- [2] PMID:16079147 — Trs85/TRAPPIII in yeast Cvt/autophagy (ortholog, KEEP)\n- [3] PMID:16874038 — Trs85 in autophagy/pexophagy (ortholog, KEEP)\n- [4] PMID:25018876 — TRAPPC8 ASH domain, centrosome targeting, ciliogenesis (KEEP)\n- [5] PMID:24244674 — TRAPPC8 in HPV entry (KEEP)\n- [8] PMID:32258032 — TRAPPC8/TRAPPC12/OFD1 in ciliogenesis (KEEP)\n- [18] PMID:26711178 — TRAPPC8/TRAPPIII in autophagy and ATG9 trafficking (KEEP)\n- [21] PMID:21525244 — TRAPPC8 (KIAA1012) as mammalian TRAPP component (KEEP)\n- [22] PMID:27066478 — TRAPP complexes review (KEEP, foundational context)\n- [28] PMID:21453443 — Trs85 organization, TRAPPC8 in mammalian TRAPP (KEEP)\n- [30] PMID:21858081 — TRAPPC2 adaptor, TRAPPC8 in TRAPPIII formation (KEEP)\n- [20] PMID:10727015 — Identification of Trs85p as TRAPP subunit (ortholog, KEEP)\n\n**EXCLUDE:**\n- [6] PMID:28199486 — Gsg1 in mouse retina bipolar cells (alias collision, not TRAPPC8)\n- [7] PMID:8619313 — GSG1 sporulation gene in yeast (alias collision — this is a different gene; the yeast TRS85 is the TRAPPC8 ortholog, not GSG1 which is a sporulation gene unrelated to TRAPP)\n- [9] PMID:37771153 — Trs85 in *Magnaporthe oryzae* fungus/rice blast (non-orthologous organism/plant pathogen context, symbol collision)\n- [10] PMID:38402593 — Trs85 in Arabidopsis cellulose synthase (plant, symbol collision)\n- [11] PMID:40266832 — TRS85 in yeast sphingolipid suppressor (tangential yeast study, but actually about Trs85 TRAPPIII function — KEEP conditionally; on reflection this is the yeast ortholog and describes a mechanistic role)\n- [12] PMID:40084709 — TRAPPC8 in Arabidopsis (plant, symbol collision/alias collision)\n- Large-scale interactome/proteome papers with no specific TRAPPC8 mechanism: [1 curated], [2 curated], [3 curated], [4 curated], [5 curated], [6 curated], [7 curated], [8 curated], [10 curated], [11 curated], [12 curated], [13 curated], [14 curated], [15 curated], [16 curated], [17 curated], [19 curated], [23 curated], [24 curated], [25 curated], [26 curated], [27 curated], [29 curated] — these are genomic/cDNA/interactome surveys with no specific TRAPPC8 mechanistic findings.\n\nReconsidering [11] PMID:40266832: yeast Trs85/TRAPPIII ortholog — KEEP for mechanistic yeast findings.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2000,\n      \"finding\": \"Trs85p was identified as one of five novel subunits of the yeast TRAPP complex, and biochemical characterization showed the complex (including its human homologue) is anchored to a Triton X-100-resistant fraction of the Golgi, implicating TRAPP in ER-to-Golgi vesicle tethering.\",\n      \"method\": \"Biochemical purification, mass spectrometry, subcellular fractionation\",\n      \"journal\": \"European journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — original identification by purification and fractionation, single lab\",\n      \"pmids\": [\"10727015\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Trs85 (Gsg1) is required for the biogenesis of Cvt vesicles and for selective autophagy via the Cvt pathway in S. cerevisiae; trs85Δ cells show defective organization of the preautophagosomal structure and impaired recruitment of GFP-Atg8 to the PAS, while general autophagy proceeds at a reduced rate, indicating a specific role in pre-autophagosomal structure organization.\",\n      \"method\": \"Genetic deletion, fluorescence microscopy (GFP-Atg8 localization), electron microscopy, biochemical assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (EM, fluorescence microscopy, biochemical assays), replicated in two independent 2005 studies\",\n      \"pmids\": [\"16079147\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Trs85 is required for macroautophagy, pexophagy, and the cytoplasm-to-vacuole targeting (Cvt) pathway in both Yarrowia lipolytica and Saccharomyces cerevisiae, establishing its conserved role in multiple selective and non-selective autophagy routes.\",\n      \"method\": \"Genetic screen, deletion mutant analysis, selective autophagy assays in two yeast species\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — independently replicated in two yeast species by two groups in the same year\",\n      \"pmids\": [\"16874038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TRAPPC8 (KIAA1012) was identified as the mammalian homologue of yeast Trs85p and confirmed as a bona fide component of human TRAPP; binary interaction mapping showed TRAPPC8 is part of the mammalian TRAPPIII-equivalent complex, and the study established that mammalian TRAPP lacks a TRAPPI-equivalent, with TRAPPC8 and TRAPPC11 being novel components.\",\n      \"method\": \"Co-immunoprecipitation, binary interaction mapping, mass spectrometry, fluorescence microscopy\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, comprehensive binary interaction map of all mammalian TRAPP subunits\",\n      \"pmids\": [\"21525244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TRAPPC2 serves as an adaptor for the formation of mammalian TRAPPIII by directly binding TRAPPC8; endogenous TRAPPC9-positive TRAPPII complex does not contain TRAPPC8, establishing that TRAPPC2 binds either TRAPPC9 (for TRAPPII) or TRAPPC8 (for TRAPPIII) in a mutually exclusive manner. A disease-causing mutation D47Y in TRAPPC2 abrogated interaction with TRAPPC8.\",\n      \"method\": \"Co-immunoprecipitation in mammalian cells, disease mutant analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP with disease mutant validation, single lab\",\n      \"pmids\": [\"21858081\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Trs85 is not associated with the yeast TRAPPII complex but proteins related to Trs85 (TRAPPC8) are part of the same TRAPP complex as Trs65 and Tca17 homologues in mammalian cells, indicating a reorganization of TRAPP complex architecture between yeast and mammals.\",\n      \"method\": \"Affinity purification, mass spectrometry, co-immunoprecipitation in yeast and mammalian cells\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — comparative biochemical analysis across species, single lab\",\n      \"pmids\": [\"21453443\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Trs85 directly interacts with Atg9 and the Trs85-containing TRAPPIII complex facilitates the association of the Rab GTPase Ypt1 onto Atg9 vesicles; Trs85 and Ypt1 localize to the preautophagosomal structure in an Atg9-dependent manner, placing TRAPPIII downstream of Atg9 in autophagosome formation.\",\n      \"method\": \"Atg9 vesicle purification, mass spectrometry, direct interaction assay, fluorescence microscopy\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — vesicle purification + direct interaction + localization with genetic dependency, multiple orthogonal methods\",\n      \"pmids\": [\"23129774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TRAPPC8 specifically interacts with HPV L2 capsid protein (MaL2) and is exposed on the cell surface where it colocalizes with inoculated HPV pseudovirions; TRAPPC8 knockdown in HeLa and HaCaT cells reduced susceptibility to HPV51, HPV16, and HPV31 infection independently of L2 interaction, and TRAPPC8 depletion caused dispersal of Golgi stack structure—a phenotype also induced by GFP-L2 overexpression—suggesting that L2 binding to TRAPPC8 inhibits its Golgi maintenance function to facilitate viral escape from the trans-Golgi network.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, immunofluorescence microscopy, infection assays with authentic virions and pseudovirions\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (Co-IP, KD phenotype, authentic virus infection), single lab\",\n      \"pmids\": [\"24244674\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TRAPPC8 was identified as containing conserved C-terminal ASH (ASPM, SPD-2, Hydin) domains and N-terminal α-solenoid/TPR repeats by computational analysis; endogenous TRAPPC8 localizes to the centrosome/basal body by immunofluorescence microscopy, and depletion of TRAPPC8 impairs ciliogenesis and prevents GFP-Rabin8 targeting to the centrosome, establishing TRAPPC8 as a ciliogenesis factor acting at the centrosome.\",\n      \"method\": \"Computational domain prediction, immunofluorescence microscopy of endogenous protein, siRNA knockdown with ciliogenesis and centrosome-targeting readouts\",\n      \"journal\": \"Cilia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — localization tied to functional consequence (ciliogenesis, Rabin8 targeting), single lab\",\n      \"pmids\": [\"25018876\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TRAPPC8 is the mammalian orthologue of the yeast autophagy-specific TRAPP subunit Trs85 and forms part of a mammalian TRAPPIII-like complex; TRAPPC8 and TBC1D14 both regulate ATG9 trafficking and RAB1 activation independently of ULK1, and TRAPPC8 is required for TBC1D14 to bind TRAPPIII. Overexpression of TBC1D14's TRAPP-binding domain inhibits both autophagy and secretory traffic, placing TRAPPIII (containing TRAPPC8) at a constitutive trafficking step from peripheral recycling endosomes to the early Golgi.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, ATG9 trafficking assays, RAB1 activation assays, autophagy flux assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including RAB1 GEF activity, ATG9 trafficking, and epistasis with ULK1, replicated with multiple readouts\",\n      \"pmids\": [\"26711178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRAPPC8 interacts with the ciliopathy protein OFD1 and is necessary for the association of OFD1 with pericentriolar material 1 (PCM1); TRAPPC8 depletion reduces colocalization of OFD1 and PCM1 without compromising centriolar satellite structural integrity. The interaction between TRAPPC8 and OFD1 is mutually inhibitory with that between OFD1 and TRAPPC12, explaining differential cilium length phenotypes: TRAPPC8 depletion reduces cilium assembly while TRAPPC12 depletion (which blocks cilia disassembly) increases cilium length.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, immunofluorescence microscopy, cilia length measurements in hTERT-RPE1 cells\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with functional epistasis between TRAPPC8 and TRAPPC12, single lab\",\n      \"pmids\": [\"32258032\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TRAPPC8 (mammalian orthologue of yeast Trs85) is the defining subunit of the TRAPPIII tethering complex, where it is recruited to the complex via TRAPPC2 in a mutually exclusive manner with TRAPPC9/TRAPPII; TRAPPC8-containing TRAPPIII acts as a GEF for RAB1/Ypt1, regulates ATG9 trafficking between peripheral recycling endosomes and the early Golgi to support autophagosome initiation, and at the centrosome/basal body promotes ciliogenesis by facilitating OFD1–PCM1 association and Rabin8 centrosome targeting.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TRAPPC8 is a TRAPPIII-specific subunit containing an N-terminal α-solenoid with TPR repeats and a C-terminal ASH domain that localizes to the centrosome/basal body, where it promotes ciliogenesis by facilitating OFD1–PCM1 association and Rabin8 centrosome targeting [PMID:25018876, PMID:32258032]. TRAPPC8 also functions in endocytic membrane trafficking; it is exposed on the cell surface, physically interacts with the HPV L2 capsid protein, and is required for HPV cell entry, with its depletion impairing both HPV endocytosis and Golgi integrity [PMID:24244674].\",\n  \"teleology\": [\n    {\n      \"year\": 2013,\n      \"claim\": \"Establishing that TRAPPC8 participates in endocytic trafficking: its interaction with HPV L2 and its requirement for viral entry and Golgi integrity revealed a role beyond canonical TRAPP-mediated ER-to-Golgi transport.\",\n      \"evidence\": \"Co-immunoprecipitation of TRAPPC8–L2, siRNA knockdown with HPV transduction and Golgi morphology readouts in HeLa and HaCaT cells\",\n      \"pmids\": [\"24244674\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No independent replication of the TRAPPC8 cell-surface exposure finding\",\n        \"Whether TRAPPC8's role in endocytosis extends to non-viral cargo is untested\",\n        \"Mechanism by which L2 binding causes Golgi dispersal is undefined\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defining TRAPPC8 as a centrosome/basal-body-localized protein required for ciliogenesis: its depletion impaired both cilium formation and GFP-Rabin8 centrosome targeting, linking TRAPPIII to Rab11-Rab8 ciliary vesicle trafficking.\",\n      \"evidence\": \"Immunofluorescence of endogenous TRAPPC8, siRNA knockdown with ciliogenesis and Rabin8 localization assays in RPE1 cells\",\n      \"pmids\": [\"25018876\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single-study demonstration; independent confirmation of centrosomal localization needed\",\n        \"Whether TRAPPC8 directly recruits Rabin8 or acts indirectly through Rab11 activation is unresolved\",\n        \"Structural basis for ASH-domain function at the basal body is unknown\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Clarifying the ciliogenesis mechanism: TRAPPC8 interacts with the ciliopathy protein OFD1 and is specifically required for OFD1–PCM1 association, with the TRAPPC8–OFD1 and TRAPPC12–OFD1 interactions being mutually exclusive, distinguishing functional contributions of individual TRAPPIII subunits.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation, siRNA knockdown with OFD1/PCM1 colocalization and cilium length measurements in hTERT-RPE1 cells\",\n      \"pmids\": [\"32258032\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether TRAPPC8 loss phenocopies OFD1 ciliopathy in vivo has not been tested\",\n        \"The stoichiometry and structural details of the TRAPPC8–OFD1 interaction are undefined\",\n        \"Relationship between TRAPPC8's ciliogenesis role and its endocytic trafficking role remains unconnected\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown whether TRAPPC8's centrosomal/ciliogenesis function and its endocytic/Golgi-trafficking function represent a unified mechanism or independent activities, and whether TRAPPC8 mutations cause ciliopathy in humans.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No in vivo genetic model for TRAPPC8 loss-of-function exists\",\n        \"No structural model of TRAPPC8 within the TRAPPIII complex\",\n        \"No direct enzymatic or GEF activity has been attributed to TRAPPC8 itself\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"complexes\": [\"TRAPPIII\"],\n    \"partners\": [\"OFD1\", \"PCM1\", \"HPV16 L2\"],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"TRAPPC8 is the defining subunit of the mammalian TRAPPIII tethering complex, linking vesicle trafficking to autophagosome biogenesis and ciliogenesis. TRAPPC8 is recruited to the TRAPP core via TRAPPC2 in a mutually exclusive manner with TRAPPC9/TRAPPII, and the resulting TRAPPIII complex functions as a GEF for RAB1, regulating ATG9 trafficking from peripheral recycling endosomes to the early Golgi to support autophagosome initiation independently of ULK1 [PMID:26711178, PMID:23129774]. At the centrosome/basal body, TRAPPC8 promotes ciliogenesis by facilitating Rabin8 centrosome targeting and the association of OFD1 with PCM1 [PMID:25018876, PMID:32258032]. TRAPPC8 also maintains Golgi stack integrity, a function exploited by HPV L2 capsid protein binding to TRAPPC8 to disrupt Golgi organization during viral infection [PMID:24244674].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Identification of Trs85p as a TRAPP complex subunit established that the complex has additional components beyond the minimal core and is anchored to Golgi membranes for ER-to-Golgi tethering.\",\n      \"evidence\": \"Biochemical purification, mass spectrometry, and subcellular fractionation in yeast\",\n      \"pmids\": [\"10727015\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific function of Trs85 within TRAPP was not resolved\", \"No mammalian homologue identified at this stage\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrating that Trs85 is required for the Cvt pathway, pexophagy, and macroautophagy in two yeast species established a conserved, specific role for this TRAPP subunit in autophagy-related membrane trafficking.\",\n      \"evidence\": \"Genetic deletion, GFP-Atg8 fluorescence microscopy, electron microscopy, and selective autophagy assays in S. cerevisiae and Y. lipolytica\",\n      \"pmids\": [\"16079147\", \"16874038\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which Trs85 promotes PAS organization was unknown\", \"Whether this autophagy role is conserved in mammals was untested\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identification of TRAPPC8 as the mammalian Trs85 orthologue and demonstration that TRAPPC2 bridges TRAPPC8 into a TRAPPIII complex mutually exclusive with TRAPPC9-containing TRAPPII resolved the architecture of mammalian TRAPP complexes.\",\n      \"evidence\": \"Binary interaction mapping, co-immunoprecipitation, mass spectrometry, and disease mutant analysis (TRAPPC2-D47Y) in mammalian cells\",\n      \"pmids\": [\"21525244\", \"21858081\", \"21453443\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether mammalian TRAPPIII retains GEF activity for Rab1/Ypt1 was not yet shown\", \"Structural basis for mutual exclusivity of TRAPPC8 and TRAPPC9 binding to TRAPPC2 was unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showing that Trs85 directly interacts with Atg9 and loads Ypt1 onto Atg9 vesicles placed TRAPPIII as a Rab-GEF acting downstream of Atg9 in autophagosome nucleation.\",\n      \"evidence\": \"Atg9 vesicle purification, direct interaction assay, mass spectrometry, and fluorescence microscopy in yeast\",\n      \"pmids\": [\"23129774\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether mammalian TRAPPC8 similarly interacts with ATG9 was not tested\", \"Mechanism by which TRAPPIII recognizes Atg9 vesicles versus other membrane carriers was unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Discovery that TRAPPC8 is required for Golgi integrity and is exploited by HPV L2 during infection revealed an unexpected role in maintaining Golgi structure and a viral subversion mechanism.\",\n      \"evidence\": \"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, and infection assays with authentic HPV virions in HeLa/HaCaT cells\",\n      \"pmids\": [\"24244674\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cell-surface exposure of TRAPPC8 was unexpected and awaits independent confirmation\", \"Whether Golgi dispersal is a direct consequence of TRAPPC8 loss or secondary to trafficking defects was not distinguished\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Localization of endogenous TRAPPC8 to the centrosome/basal body and demonstration that its depletion blocks Rabin8 targeting and ciliogenesis extended TRAPPIII function beyond Golgi trafficking to the primary cilium.\",\n      \"evidence\": \"Immunofluorescence of endogenous protein, siRNA knockdown with ciliogenesis and Rabin8 centrosome-targeting readouts in mammalian cells\",\n      \"pmids\": [\"25018876\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Which TRAPPC8 domain mediates centrosome localization was not mapped\", \"Whether TRAPPC8's ciliogenesis role requires its GEF-associated activity was untested\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Establishing that TRAPPC8-containing TRAPPIII acts as a RAB1 GEF regulating ATG9 trafficking from recycling endosomes to the early Golgi, independently of ULK1, unified the yeast autophagy findings with mammalian membrane trafficking and autophagy pathways.\",\n      \"evidence\": \"RAB1 activation assays, ATG9 trafficking assays, autophagy flux measurements, co-immunoprecipitation, and epistasis experiments with ULK1 and TBC1D14\",\n      \"pmids\": [\"26711178\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TRAPPIII's constitutive secretory role is separable from its autophagy-specific role at the molecular level was not resolved\", \"Structural basis for TBC1D14–TRAPPIII interaction was not determined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showing that TRAPPC8 bridges OFD1 to PCM1 and competes with TRAPPC12 for OFD1 binding provided a molecular mechanism for how TRAPPIII promotes cilium assembly while TRAPPC12 opposes cilium disassembly.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation, siRNA knockdown, immunofluorescence, and cilia length measurements in hTERT-RPE1 cells\",\n      \"pmids\": [\"32258032\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether TRAPPC8–OFD1 interaction is direct or requires other centriolar satellite components was not established\", \"In vivo consequences of TRAPPC8 loss for cilium-related signaling pathways (e.g., Hedgehog) were not examined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how TRAPPC8's dual functions at the Golgi/recycling endosome (autophagy, secretion) and the centrosome (ciliogenesis) are spatiotemporally coordinated, and no high-resolution structure of mammalian TRAPPIII incorporating TRAPPC8 has been reported.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of full-length mammalian TRAPPIII\", \"Mechanism coordinating TRAPPC8's roles in autophagy versus ciliogenesis is unknown\", \"Whether TRAPPC8 mutations cause a human Mendelian disease has not been established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 4, 9]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [6, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0, 7]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [8, 10]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [1, 2, 6, 9]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 3, 9]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [8, 10]}\n    ],\n    \"complexes\": [\"TRAPPIII\"],\n    \"partners\": [\"TRAPPC2\", \"TRAPPC9\", \"OFD1\", \"PCM1\", \"TBC1D14\", \"ATG9\"],\n    \"other_free_text\": []\n  }\n}\n```"}