{"gene":"STX8","run_date":"2026-04-28T21:42:57","timeline":{"discoveries":[{"year":1998,"finding":"Syntaxin 8 was identified as a novel member of the syntaxin/SNAP-25 subfamily of SNAREs. It is broadly expressed and, by immunofluorescence, co-localizes with markers of the endoplasmic reticulum, suggesting a role in vesicle trafficking at that compartment. It contains a predicted C-terminal transmembrane anchor.","method":"cDNA cloning, immunofluorescence co-localization with ER markers, sequence analysis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, immunofluorescence localization without functional rescue; foundational characterization paper","pmids":["9852078"],"is_preprint":false},{"year":1999,"finding":"Human STX8 cDNA was cloned using the CFTR R-domain as bait in a yeast two-hybrid screen of a fetal lung library. STX8 encodes a 236-amino-acid protein mapping to chromosomal band 17p12. Its C-terminal half contains a coiled-coil domain conserved in the t-SNARE superfamily and a C-terminal hydrophobic transmembrane anchor, consistent with a role in vesicular trafficking and docking.","method":"Yeast two-hybrid screening, cDNA cloning, FISH chromosomal mapping, sequence/structural analysis","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 — cloning and chromosomal localization; interaction with CFTR R-domain identified but not further validated mechanistically","pmids":["10198254"],"is_preprint":false},{"year":1999,"finding":"Syntaxin 8 localizes predominantly to early endosomes and functions in clathrin-independent vesicular transport and membrane fusion events required for protein transport from early endosomes (EEs) to late endosomes (LEs). STX8-containing SNARE complexes are dissociated by α-SNAP and NSF, confirming canonical SNARE behavior. This is distinct from syntaxin 7, which localizes to vacuolar EEs and mediates plasma membrane-to-EE and homotypic endosome fusion.","method":"Immunofluorescence co-localization with endosomal markers, co-immunoprecipitation of SNARE complexes, α-SNAP/NSF dissociation assay, functional endocytic trafficking assays","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP of SNARE complex, NSF dissociation assay, and localization linked to functional trafficking phenotype in a single study","pmids":["10564279"],"is_preprint":false},{"year":2000,"finding":"Syntaxin 7, syntaxin 8, vti1b, and endobrevin/VAMP-8 form a cognate four-helix SNARE core complex that mediates fusion of late endosomes. Antibodies specific for each of the four proteins co-precipitate the entire complex, inhibit homotypic late endosome fusion in vitro, and retard delivery of endocytosed EGF to lysosomes. Substitution experiments and structural comparisons show that syntaxin 8 occupies the position corresponding to the C-terminal domain of SNAP-25 in the neuronal complex.","method":"Reciprocal co-immunoprecipitation of all four SNARE components, in vitro late endosome fusion inhibition assay with specific antibodies, EGF-to-lysosome trafficking assay, biophysical characterization of purified core complex, sequence/structural comparison","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 — reconstituted core complex with purified proteins, in vitro fusion assay inhibition, reciprocal co-IPs for all four components, functional trafficking readout; strong, replicated evidence","pmids":["11101518"],"is_preprint":false},{"year":2010,"finding":"The tumor suppressor Mig-6 binds directly to STX8 and uses this interaction to drive ligand-stimulated EGFR into late endosomes for lysosomal degradation. Loss of Mig-6 in glioblastoma sustains aberrant EGFR signaling. Mechanistically, Mig-6 acts as a molecular bridge linking internalized EGFR to STX8-dependent late endosome trafficking, thereby suppressing gliomagenesis.","method":"Co-immunoprecipitation of Mig-6 with STX8, genomic deletion analysis (focal 1p36 deletion in GBM), EGFR degradation/trafficking assays (late endosome delivery, lysosomal degradation), Mig-6 knockdown/overexpression with phenotypic rescue, in vivo glioma models","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — Co-IP of Mig-6–STX8 interaction, functional EGFR trafficking assays, loss-of-function with defined molecular mechanism and in vivo tumor model","pmids":["20351267"],"is_preprint":false},{"year":2021,"finding":"In Schizosaccharomyces pombe, Stx8 (Fsv1) localizes to both the trans-Golgi network (TGN) and the prevacuolar endosome (PVE). Its SNARE domain is required for vesicle fusion at the PVE, confirming conserved syntaxin-8 function. Stx8 recycling from the PVE to the TGN requires the retromer component Vps35 and sorting nexins Vps5, Vps17, and Snx3, identifying Stx8 as a Snx3-retromer cargo. Mutagenesis mapped the retromer sorting signal to an IEMeaM sequence (residues 133I, 134E, 135M, 138M essential) in an unstructured region distal from the transmembrane helix, a motif distinct from canonical aromatic-residue-containing retromer signals.","method":"Fluorescence microscopy (localization), truncation and alanine-scanning mutagenesis of sorting signal, genetic deletion of retromer/sorting nexin components with trafficking phenotype readout, salt sensitivity assay in stx8Δ cells","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — extensive mutagenesis defining sorting motif residues, epistasis with retromer components, localization tied to functional consequence; multiple orthogonal methods in single study","pmids":["33788833"],"is_preprint":false},{"year":2024,"finding":"A clickable photoaffinity probe mimicking trehalose dimycolate (TDM) from Mycobacterium tuberculosis binds the host SNARE proteins VTI1B, STX8, and VAMP2 in macrophages. Normally, VTI1B and STX8 promote endosome fusion by forming a complex with VAMP8. However, in the presence of M. tuberculosis or TDM, VTI1B and STX8 engage non-canonically with VAMP2 instead, reducing VAMP8 binding and thereby inhibiting phagosome maturation and promoting intracellular M. tuberculosis replication.","method":"Photoaffinity labeling with clickable TDM probe, mass spectrometry identification of bound SNARE proteins, co-immunoprecipitation of SNARE complexes (canonical vs. non-canonical), phagosome maturation assay, intracellular bacterial replication assay","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — photoaffinity probe plus co-IP of non-canonical SNARE complex plus functional phagosome/replication readout; preprint, not yet peer-reviewed","pmids":["bio_10.1101_2024.12.16.627577"],"is_preprint":true},{"year":2024,"finding":"Salmonella effector protein SipA interacts with syntaxin 8 (STX8) to help maintain the Salmonella-containing vacuole (SCV) and prevent lysosomal fusion, supporting intracellular bacterial survival.","method":"BioID proximity labeling screen, referenced interaction of SipA with STX8 based on SPI effector interactome data","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3-4 — interaction noted from BioID/proximity screen in preprint context; not directly validated by orthogonal co-IP or functional rescue specific to STX8","pmids":["bio_10.1101_2024.12.12.628128"],"is_preprint":true},{"year":2026,"finding":"Under hypoxic conditions in head and neck squamous cell carcinoma (HNSCC), STX8 together with VAMP4 mediates autophagic secretion of mitochondria via extracellular vesicles (EVs). This mitophagy-dependent EV secretion promotes tumor-associated macrophage polarization toward an immunosuppressive phenotype, reshaping the tumor immune microenvironment. STX8 was identified as a key SNARE component of multivesicular body membrane-mediated secretion in this context.","method":"Multivesicular body membrane proteomics, molecular interaction validation (co-IP/pulldown implied), functional assays of EV secretion and macrophage polarization under hypoxia, knockdown experiments","journal":"Journal of extracellular vesicles","confidence":"Medium","confidence_rationale":"Tier 2-3 — proteomics plus molecular interaction validation plus functional EV secretion and macrophage polarization readout; single study","pmids":["41979085"],"is_preprint":false}],"current_model":"STX8 is a t-SNARE protein that occupies the SNAP-25 C-terminal position in a four-helix SNARE core complex with syntaxin 7, vti1b, and VAMP8/endobrevin to drive late endosome fusion; it localizes to early and late endosomes where it mediates clathrin-independent transport from early to late endosomes, is recycled from the prevacuolar endosome to the trans-Golgi network via Snx3-retromer through a non-canonical IEMxxM sorting motif, is engaged by the tumor suppressor Mig-6 to link EGFR to late endosomal degradation, and is hijacked by mycobacterial TDM glycolipid to form non-canonical SNARE complexes with VAMP2 that block phagosome maturation and promote intracellular M. tuberculosis survival."},"narrative":{"teleology":[{"year":1998,"claim":"Identification of STX8 as a novel syntaxin/SNAP-25-subfamily SNARE with a predicted transmembrane anchor established it as a candidate vesicle-trafficking component, though its initial localization was ascribed to the ER.","evidence":"cDNA cloning, immunofluorescence co-localization with ER markers, sequence analysis","pmids":["9852078"],"confidence":"Medium","gaps":["Initial ER localization was subsequently revised to endosomes by later studies","No functional data or binding partners identified"]},{"year":1999,"claim":"Re-evaluation of STX8 localization placed it predominantly on early endosomes and demonstrated its requirement for clathrin-independent transport from early to late endosomes, resolving its compartmental identity and revealing its trafficking function.","evidence":"Immunofluorescence with endosomal markers, co-immunoprecipitation of SNARE complexes, α-SNAP/NSF dissociation assay, functional endocytic trafficking assays","pmids":["10564279"],"confidence":"High","gaps":["Identity of cognate SNARE partners not yet determined","Structural basis for STX8 position in the SNARE bundle unknown"]},{"year":2000,"claim":"Reconstitution of a quaternary SNARE core complex (syntaxin 7 / STX8 / vti1b / VAMP8) defined the cognate fusion machinery for late endosomes and established that STX8 occupies the SNAP-25 C-terminal helix position.","evidence":"Reciprocal co-immunoprecipitation of all four SNAREs, in vitro late endosome fusion inhibition with specific antibodies, EGF-to-lysosome degradation assay, biophysical characterization of purified complex","pmids":["11101518"],"confidence":"High","gaps":["No high-resolution structure of the endosomal SNARE complex","Regulatory mechanisms controlling complex assembly/disassembly not addressed"]},{"year":2010,"claim":"Discovery that the tumor suppressor Mig-6 directly binds STX8 to route EGFR into late endosomes for degradation revealed a mechanism linking receptor tyrosine kinase downregulation to SNARE-dependent trafficking and explained how Mig-6 loss sustains oncogenic signaling in glioblastoma.","evidence":"Co-immunoprecipitation of Mig-6–STX8, EGFR degradation/trafficking assays, Mig-6 knockdown/overexpression with phenotypic rescue, in vivo glioma models","pmids":["20351267"],"confidence":"High","gaps":["Binding interface between Mig-6 and STX8 not structurally resolved","Whether other RTKs are routed through the same Mig-6–STX8 axis is untested"]},{"year":2021,"claim":"Systematic mutagenesis in S. pombe identified an IEMxxM motif as the Snx3-retromer sorting signal for Stx8 recycling from prevacuolar endosome to TGN, defining a non-canonical retromer cargo recognition mechanism.","evidence":"Alanine-scanning mutagenesis of sorting motif residues, genetic deletion of retromer/sorting nexin components with trafficking readout, fluorescence microscopy","pmids":["33788833"],"confidence":"High","gaps":["Conservation and functional necessity of the IEMxxM motif in mammalian STX8 not tested","Direct structural interaction between Snx3 and the sorting motif not demonstrated"]},{"year":2024,"claim":"Photoaffinity labeling showed that mycobacterial trehalose dimycolate binds STX8 and VTI1B, redirecting them into a non-canonical complex with VAMP2 instead of VAMP8, thereby blocking phagosome maturation — revealing a pathogen strategy to subvert endosomal SNARE specificity.","evidence":"Clickable TDM photoaffinity probe, mass spectrometry, co-immunoprecipitation of canonical vs. non-canonical SNARE complexes, phagosome maturation and intracellular bacterial replication assays (preprint)","pmids":["bio_10.1101_2024.12.16.627577"],"confidence":"Medium","gaps":["Preprint not yet peer-reviewed","Structural basis for TDM-induced SNARE partner switching unknown","Whether VAMP2 engagement is sufficient or requires additional host factors is unresolved"]},{"year":2026,"claim":"STX8 was identified as a SNARE component of multivesicular body membranes that, together with VAMP4, mediates hypoxia-driven autophagic secretion of mitochondria via extracellular vesicles in HNSCC, linking endosomal SNARE function to tumor immune evasion.","evidence":"Multivesicular body membrane proteomics, co-IP/pulldown, functional EV secretion and macrophage polarization assays under hypoxia, knockdown experiments","pmids":["41979085"],"confidence":"Medium","gaps":["Single study; independent replication needed","Whether STX8's role in EV-mediated mitophagy extends beyond HNSCC or hypoxic conditions is unknown","Mechanism by which STX8 is recruited to MVB membranes under hypoxia not defined"]},{"year":null,"claim":"A high-resolution structure of the endosomal SNARE complex containing STX8 is lacking, the mammalian retromer sorting motif for STX8 recycling has not been validated, and the full scope of pathogen effectors that co-opt STX8 remains undefined.","evidence":"","pmids":[],"confidence":"High","gaps":["No atomic-resolution structure of the STX7/STX8/VTI1B/VAMP8 complex","Mammalian IEMxxM motif conservation and function untested","Breadth of pathogen exploitation of STX8-containing SNARE complexes incompletely mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[3]}],"localization":[{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[2,3,4]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[5]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[2,8]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[2,3,4,5]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[8]}],"complexes":["STX7/STX8/VTI1B/VAMP8 late-endosomal SNARE complex"],"partners":["STX7","VTI1B","VAMP8","ERRFI1","VPS35","SNX3"],"other_free_text":[]},"mechanistic_narrative":"STX8 is an endosomal t-SNARE that assembles with syntaxin 7, vti1b, and VAMP8/endobrevin into a four-helix SNARE core complex to drive late endosome fusion and cargo delivery to lysosomes [PMID:11101518]. It localizes primarily to early and late endosomes, where it mediates clathrin-independent transport from early to late endosomes, and its recycling from the prevacuolar endosome to the trans-Golgi network depends on Snx3-retromer recognition of a non-canonical IEMxxM sorting motif [PMID:10564279, PMID:33788833]. The tumor suppressor Mig-6 bridges internalized EGFR to STX8-dependent late-endosomal trafficking, promoting lysosomal degradation of EGFR; loss of Mig-6 in glioblastoma sustains aberrant EGFR signaling [PMID:20351267]. STX8 is also co-opted by intracellular pathogens and participates in hypoxia-driven autophagic secretion of mitochondria via extracellular vesicles in head and neck squamous cell carcinoma [PMID:41979085]."},"prefetch_data":{"uniprot":{"accession":"Q9UNK0","full_name":"Syntaxin-8","aliases":[],"length_aa":236,"mass_kda":26.9,"function":"Vesicle trafficking protein that functions in the early secretory pathway, possibly by mediating retrograde transport from cis-Golgi membranes to the ER","subcellular_location":"Membrane","url":"https://www.uniprot.org/uniprotkb/Q9UNK0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/STX8","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000170310","cell_line_id":"CID000755","localizations":[{"compartment":"vesicles","grade":3}],"interactors":[{"gene":"VTI1B","stoichiometry":10.0},{"gene":"VTI1A","stoichiometry":10.0},{"gene":"NSF","stoichiometry":4.0},{"gene":"CLTA","stoichiometry":0.2},{"gene":"LAMP1","stoichiometry":0.2},{"gene":"NAPA","stoichiometry":0.2},{"gene":"STX12","stoichiometry":0.2},{"gene":"STX7","stoichiometry":0.2},{"gene":"VAMP3;VAMP2","stoichiometry":0.2},{"gene":"SCFD1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000755","total_profiled":1310},"omim":[{"mim_id":"615738","title":"VPS51 SUBUNIT OF GARP COMPLEX; VPS51","url":"https://www.omim.org/entry/615738"},{"mim_id":"613401","title":"VPS33B-INTERACTING PROTEIN, APICAL-BASOLATERAL POLARITY REGULATOR, SPE39 HOMOLOG; VIPAS39","url":"https://www.omim.org/entry/613401"},{"mim_id":"611438","title":"TAXILIN, BETA; TXLNB","url":"https://www.omim.org/entry/611438"},{"mim_id":"604203","title":"SYNTAXIN 8; STX8","url":"https://www.omim.org/entry/604203"},{"mim_id":"603287","title":"PYRIDOXAMINE 5-PRIME-PHOSPHATE OXIDASE; PNPO","url":"https://www.omim.org/entry/603287"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/STX8"},"hgnc":{"alias_symbol":["CARB"],"prev_symbol":[]},"alphafold":{"accession":"Q9UNK0","domains":[{"cath_id":"1.20.58","chopping":"1-101","consensus_level":"medium","plddt":87.0048,"start":1,"end":101}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UNK0","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UNK0-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UNK0-F1-predicted_aligned_error_v6.png","plddt_mean":76.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=STX8","jax_strain_url":"https://www.jax.org/strain/search?query=STX8"},"sequence":{"accession":"Q9UNK0","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UNK0.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UNK0/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UNK0"}},"corpus_meta":[{"pmid":"6308632","id":"PMC_6308632","title":"The carB gene of Escherichia coli: a 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immunology","url":"https://pubmed.ncbi.nlm.nih.gov/30833792","citation_count":159,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"15840729","id":"PMC_15840729","title":"Scanning the human proteome for calmodulin-binding proteins.","date":"2005","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/15840729","citation_count":139,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"31871319","id":"PMC_31871319","title":"Mapping the proximity interaction network of the Rho-family GTPases reveals signalling pathways and regulatory mechanisms.","date":"2019","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/31871319","citation_count":137,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"10564279","id":"PMC_10564279","title":"Differential roles of syntaxin 7 and syntaxin 8 in endosomal trafficking.","date":"1999","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/10564279","citation_count":121,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19422935","id":"PMC_19422935","title":"Genetic risk profiling and prediction of disease course in Crohn's disease patients.","date":"2009","source":"Clinical gastroenterology and hepatology : the official clinical practice journal of the American Gastroenterological Association","url":"https://pubmed.ncbi.nlm.nih.gov/19422935","citation_count":117,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"18029348","id":"PMC_18029348","title":"Toward a confocal subcellular atlas of the human proteome.","date":"2007","source":"Molecular & cellular proteomics : MCP","url":"https://pubmed.ncbi.nlm.nih.gov/18029348","citation_count":114,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19174780","id":"PMC_19174780","title":"Confirmation of multiple Crohn's disease susceptibility loci in a large Dutch-Belgian cohort.","date":"2009","source":"The American journal of gastroenterology","url":"https://pubmed.ncbi.nlm.nih.gov/19174780","citation_count":113,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"34349018","id":"PMC_34349018","title":"Protein interaction landscapes revealed by advanced in vivo cross-linking-mass spectrometry.","date":"2021","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/34349018","citation_count":113,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"20379614","id":"PMC_20379614","title":"Personalized smoking cessation: interactions between nicotine dose, dependence and quit-success genotype score.","date":"2010","source":"Molecular medicine (Cambridge, Mass.)","url":"https://pubmed.ncbi.nlm.nih.gov/20379614","citation_count":108,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"20351267","id":"PMC_20351267","title":"Mig-6 controls EGFR trafficking and suppresses gliomagenesis.","date":"2010","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/20351267","citation_count":99,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":38991,"output_tokens":1451,"usd":0.069369},"stage2":{"model":"claude-opus-4-6","input_tokens":4667,"output_tokens":1569,"usd":0.09384},"total_usd":0.401632,"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":50964,"output_tokens":3398,"usd":0.101931},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":6434,"output_tokens":2353,"usd":0.136492}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"Human syntaxin 8 (STX8) was cloned and found to encode a 236-amino-acid protein containing a coiled-coil domain conserved in the t-SNARE superfamily and a C-terminal hydrophobic transmembrane anchor, consistent with a role in vesicular trafficking and docking. STX8 was identified via yeast two-hybrid screening using the CFTR R domain as bait, suggesting a potential interaction with CFTR.\",\n      \"method\": \"Yeast two-hybrid screening, cDNA cloning, sequence/domain analysis, chromosomal localization\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single yeast two-hybrid identification with domain analysis; interaction with CFTR not further validated in this paper\",\n      \"pmids\": [\"10198254\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In Schizosaccharomyces pombe, Stx8 (ortholog of mammalian syntaxin 8) localizes to the trans-Golgi network and prevacuolar endosome (PVE), and its SNARE domain is required for vesicle fusion at the PVE. Stx8 is recycled from the PVE to the TGN via the Snx3-retromer complex (requiring Vps35, Vps5, Vps17, and Snx3), and its sorting signal was mapped by truncation/alanine scanning mutagenesis to an IEMeaM sequence distinct from canonical aromatic-residue retromer motifs.\",\n      \"method\": \"Genetic deletion, live cell imaging/localization, alanine scanning mutagenesis, truncation analysis, epistasis with retromer components\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (localization, mutagenesis, genetic epistasis) in a single study with rigorous controls in a relevant ortholog\",\n      \"pmids\": [\"33788833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"STX8 (along with VTI1B) normally promotes endosome fusion by forming a SNARE complex with VAMP8. In the presence of Mycobacterium tuberculosis or its glycolipid trehalose dimycolate (TDM), STX8 and VTI1B are redirected to form a non-canonical complex with VAMP2 instead of VAMP8, thereby decreasing VAMP8 binding and inhibiting phagosome maturation, which promotes intracellular M. tuberculosis replication.\",\n      \"method\": \"Photoaffinity/clickable TDM probe pulldown, Co-IP/complex analysis, knockdown/overexpression with bacterial survival readout, phagosome maturation assays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — chemical probe pulldown plus functional assays; preprint, single lab\",\n      \"pmids\": [\"bio_10.1101_2024.12.16.627577\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Salmonella effector SipA interacts with syntaxin 8 (STX8) to maintain the Salmonella-containing vacuole (SCV) and manipulate endo-lysosomal trafficking in host cells.\",\n      \"method\": \"BioID proximity labeling screening, co-immunoprecipitation, knockdown/rescue experiments with bacterial survival readout\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — BioID interaction and knockdown data; preprint, single lab, limited mechanistic follow-up for STX8 specifically\",\n      \"pmids\": [\"bio_10.1101_2024.12.12.628128\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"VAMP4 and STX8 are key SNARE molecules mediating autophagic secretion of mitochondria via extracellular vesicles under hypoxic conditions in head and neck squamous cell carcinoma (HNSCC). This process drives tumor-associated macrophage polarization toward immunosuppressive phenotypes, reshaping the tumor immune microenvironment.\",\n      \"method\": \"Multivesicular body membrane proteomics, molecular interaction validation, loss-of-function experiments with EV secretion and macrophage polarization readouts\",\n      \"journal\": \"Journal of extracellular vesicles\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — proteomics plus molecular validation and functional phenotypic readout; single lab\",\n      \"pmids\": [\"41979085\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"STX8 is a t-SNARE protein that localizes to late endosomes/multivesicular bodies and, together with partner SNAREs (VTI1B, VAMP8), mediates endosomal/prevacuolar vesicle fusion; it is recycled to the TGN via the Snx3-retromer through a non-canonical IEMxxM sorting motif, and can be subverted by pathogens (M. tuberculosis TDM, Salmonella SipA) that redirect it into non-canonical SNARE complexes to block phagosome maturation, while also participating in VAMP4-dependent autophagic secretion of mitochondria that reshapes the tumor immune microenvironment.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll classify each paper and extract discoveries only from KEEP papers.\n\n**Classification:**\n- Papers [1]-[17], [19]-[50], [52]-[68], [70]-[74], [76], [79]-[82] in the main corpus: EXCLUDE (carbamoylphosphate synthetase carB, CARB β-lactamases, carotenoid carB, dietary low-carb, CARB-pharmacophore, CARB hair structure, etc. — all symbol collisions unrelated to STX8)\n- Main corpus [18]: KEEP (human STX8 cloning)\n- Main corpus [51]: KEEP (Stx8 in S. pombe — ortholog study)\n- Main corpus [69]: KEEP (VAMP4/STX8 in HNSCC)\n- Main corpus [75]: EXCLUDE (GWAS/MR association only, no mechanism)\n- Main corpus [77]: KEEP (TDM-STX8 SNARE interaction preprint)\n- Main corpus [78]: KEEP (mentions STX8/SipA interaction in Salmonella context)\n\n**Additional curated papers:**\n- [16]: KEEP (STX8 SNARE complex mediating late endosome fusion)\n- [19]: KEEP (STX8 characterization/localization)\n- [24]: KEEP (syntaxin 7 and syntaxin 8 endosomal trafficking)\n- [30]: KEEP (Mig-6/STX8/EGFR trafficking mechanism)\n- [1]-[15], [17]-[18], [20]-[23], [25]-[29]: EXCLUDE or general interactome screens (no STX8-specific mechanism)\n- [20] (Scales 2000): KEEP (SNARE specificity, STX8 mentioned in context)\n- [21] Hubel ISG: EXCLUDE\n- [22] CaM: EXCLUDE\n- [1]-[15], [17]-[18], [21]-[23], [25]-[29]: Large interactome screens — EXCLUDE from specific discoveries\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"Syntaxin 8 was identified as a novel member of the syntaxin/SNAP-25 subfamily of SNAREs. It is broadly expressed and, by immunofluorescence, co-localizes with markers of the endoplasmic reticulum, suggesting a role in vesicle trafficking at that compartment. It contains a predicted C-terminal transmembrane anchor.\",\n      \"method\": \"cDNA cloning, immunofluorescence co-localization with ER markers, sequence analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, immunofluorescence localization without functional rescue; foundational characterization paper\",\n      \"pmids\": [\"9852078\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Human STX8 cDNA was cloned using the CFTR R-domain as bait in a yeast two-hybrid screen of a fetal lung library. STX8 encodes a 236-amino-acid protein mapping to chromosomal band 17p12. Its C-terminal half contains a coiled-coil domain conserved in the t-SNARE superfamily and a C-terminal hydrophobic transmembrane anchor, consistent with a role in vesicular trafficking and docking.\",\n      \"method\": \"Yeast two-hybrid screening, cDNA cloning, FISH chromosomal mapping, sequence/structural analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — cloning and chromosomal localization; interaction with CFTR R-domain identified but not further validated mechanistically\",\n      \"pmids\": [\"10198254\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Syntaxin 8 localizes predominantly to early endosomes and functions in clathrin-independent vesicular transport and membrane fusion events required for protein transport from early endosomes (EEs) to late endosomes (LEs). STX8-containing SNARE complexes are dissociated by α-SNAP and NSF, confirming canonical SNARE behavior. This is distinct from syntaxin 7, which localizes to vacuolar EEs and mediates plasma membrane-to-EE and homotypic endosome fusion.\",\n      \"method\": \"Immunofluorescence co-localization with endosomal markers, co-immunoprecipitation of SNARE complexes, α-SNAP/NSF dissociation assay, functional endocytic trafficking assays\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP of SNARE complex, NSF dissociation assay, and localization linked to functional trafficking phenotype in a single study\",\n      \"pmids\": [\"10564279\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Syntaxin 7, syntaxin 8, vti1b, and endobrevin/VAMP-8 form a cognate four-helix SNARE core complex that mediates fusion of late endosomes. Antibodies specific for each of the four proteins co-precipitate the entire complex, inhibit homotypic late endosome fusion in vitro, and retard delivery of endocytosed EGF to lysosomes. Substitution experiments and structural comparisons show that syntaxin 8 occupies the position corresponding to the C-terminal domain of SNAP-25 in the neuronal complex.\",\n      \"method\": \"Reciprocal co-immunoprecipitation of all four SNARE components, in vitro late endosome fusion inhibition assay with specific antibodies, EGF-to-lysosome trafficking assay, biophysical characterization of purified core complex, sequence/structural comparison\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reconstituted core complex with purified proteins, in vitro fusion assay inhibition, reciprocal co-IPs for all four components, functional trafficking readout; strong, replicated evidence\",\n      \"pmids\": [\"11101518\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The tumor suppressor Mig-6 binds directly to STX8 and uses this interaction to drive ligand-stimulated EGFR into late endosomes for lysosomal degradation. Loss of Mig-6 in glioblastoma sustains aberrant EGFR signaling. Mechanistically, Mig-6 acts as a molecular bridge linking internalized EGFR to STX8-dependent late endosome trafficking, thereby suppressing gliomagenesis.\",\n      \"method\": \"Co-immunoprecipitation of Mig-6 with STX8, genomic deletion analysis (focal 1p36 deletion in GBM), EGFR degradation/trafficking assays (late endosome delivery, lysosomal degradation), Mig-6 knockdown/overexpression with phenotypic rescue, in vivo glioma models\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP of Mig-6–STX8 interaction, functional EGFR trafficking assays, loss-of-function with defined molecular mechanism and in vivo tumor model\",\n      \"pmids\": [\"20351267\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In Schizosaccharomyces pombe, Stx8 (Fsv1) localizes to both the trans-Golgi network (TGN) and the prevacuolar endosome (PVE). Its SNARE domain is required for vesicle fusion at the PVE, confirming conserved syntaxin-8 function. Stx8 recycling from the PVE to the TGN requires the retromer component Vps35 and sorting nexins Vps5, Vps17, and Snx3, identifying Stx8 as a Snx3-retromer cargo. Mutagenesis mapped the retromer sorting signal to an IEMeaM sequence (residues 133I, 134E, 135M, 138M essential) in an unstructured region distal from the transmembrane helix, a motif distinct from canonical aromatic-residue-containing retromer signals.\",\n      \"method\": \"Fluorescence microscopy (localization), truncation and alanine-scanning mutagenesis of sorting signal, genetic deletion of retromer/sorting nexin components with trafficking phenotype readout, salt sensitivity assay in stx8Δ cells\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — extensive mutagenesis defining sorting motif residues, epistasis with retromer components, localization tied to functional consequence; multiple orthogonal methods in single study\",\n      \"pmids\": [\"33788833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"A clickable photoaffinity probe mimicking trehalose dimycolate (TDM) from Mycobacterium tuberculosis binds the host SNARE proteins VTI1B, STX8, and VAMP2 in macrophages. Normally, VTI1B and STX8 promote endosome fusion by forming a complex with VAMP8. However, in the presence of M. tuberculosis or TDM, VTI1B and STX8 engage non-canonically with VAMP2 instead, reducing VAMP8 binding and thereby inhibiting phagosome maturation and promoting intracellular M. tuberculosis replication.\",\n      \"method\": \"Photoaffinity labeling with clickable TDM probe, mass spectrometry identification of bound SNARE proteins, co-immunoprecipitation of SNARE complexes (canonical vs. non-canonical), phagosome maturation assay, intracellular bacterial replication assay\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — photoaffinity probe plus co-IP of non-canonical SNARE complex plus functional phagosome/replication readout; preprint, not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2024.12.16.627577\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Salmonella effector protein SipA interacts with syntaxin 8 (STX8) to help maintain the Salmonella-containing vacuole (SCV) and prevent lysosomal fusion, supporting intracellular bacterial survival.\",\n      \"method\": \"BioID proximity labeling screen, referenced interaction of SipA with STX8 based on SPI effector interactome data\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3-4 — interaction noted from BioID/proximity screen in preprint context; not directly validated by orthogonal co-IP or functional rescue specific to STX8\",\n      \"pmids\": [\"bio_10.1101_2024.12.12.628128\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Under hypoxic conditions in head and neck squamous cell carcinoma (HNSCC), STX8 together with VAMP4 mediates autophagic secretion of mitochondria via extracellular vesicles (EVs). This mitophagy-dependent EV secretion promotes tumor-associated macrophage polarization toward an immunosuppressive phenotype, reshaping the tumor immune microenvironment. STX8 was identified as a key SNARE component of multivesicular body membrane-mediated secretion in this context.\",\n      \"method\": \"Multivesicular body membrane proteomics, molecular interaction validation (co-IP/pulldown implied), functional assays of EV secretion and macrophage polarization under hypoxia, knockdown experiments\",\n      \"journal\": \"Journal of extracellular vesicles\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — proteomics plus molecular interaction validation plus functional EV secretion and macrophage polarization readout; single study\",\n      \"pmids\": [\"41979085\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"STX8 is a t-SNARE protein that occupies the SNAP-25 C-terminal position in a four-helix SNARE core complex with syntaxin 7, vti1b, and VAMP8/endobrevin to drive late endosome fusion; it localizes to early and late endosomes where it mediates clathrin-independent transport from early to late endosomes, is recycled from the prevacuolar endosome to the trans-Golgi network via Snx3-retromer through a non-canonical IEMxxM sorting motif, is engaged by the tumor suppressor Mig-6 to link EGFR to late endosomal degradation, and is hijacked by mycobacterial TDM glycolipid to form non-canonical SNARE complexes with VAMP2 that block phagosome maturation and promote intracellular M. tuberculosis survival.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"STX8 is a t-SNARE protein that localizes to late endosomes/prevacuolar compartments and the trans-Golgi network, where it mediates endosomal vesicle fusion through SNARE complex formation with VTI1B and VAMP8 [PMID:10198254, PMID:33788833]. STX8 is recycled from endosomes to the TGN via the Snx3-retromer complex, utilizing a non-canonical IEMxxM sorting motif rather than a typical aromatic-residue signal [PMID:33788833]. STX8 participates in VAMP4-dependent autophagic secretion of mitochondria via extracellular vesicles under hypoxia, a process that drives immunosuppressive macrophage polarization in head and neck squamous cell carcinoma [PMID:41979085].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Cloning of STX8 established it as a member of the t-SNARE superfamily with a coiled-coil domain and C-terminal transmembrane anchor, placing it in the vesicular trafficking machinery.\",\n      \"evidence\": \"Yeast two-hybrid screening and cDNA cloning with domain/sequence analysis in human cells\",\n      \"pmids\": [\"10198254\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Interaction with CFTR identified by yeast two-hybrid was not validated by orthogonal methods\",\n        \"Subcellular localization and SNARE partners were not determined\",\n        \"No functional trafficking assay performed\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Characterization of the S. pombe ortholog revealed that Stx8 mediates vesicle fusion at the prevacuolar endosome and is recycled to the TGN via Snx3-retromer through a non-canonical IEMeaM sorting motif, establishing the retromer-dependent recycling mechanism for this SNARE.\",\n      \"evidence\": \"Genetic deletion, live cell imaging, alanine scanning mutagenesis, and epistasis with retromer components (Vps35, Snx3) in S. pombe\",\n      \"pmids\": [\"33788833\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Conservation of the IEMxxM motif-dependent retromer recycling in mammalian STX8 not directly tested\",\n        \"Identity of mammalian SNARE complex partners at the endosome not addressed in this study\",\n        \"Structural basis for Snx3-retromer recognition of the sorting motif unknown\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"M. tuberculosis glycolipid TDM was shown to redirect STX8 from its canonical VAMP8-containing SNARE complex into a non-canonical complex with VAMP2, thereby blocking phagosome maturation — revealing a pathogen strategy that exploits STX8 partner switching.\",\n      \"evidence\": \"Photoaffinity/clickable TDM probe pulldown, co-immunoprecipitation, knockdown/overexpression with bacterial survival and phagosome maturation assays (preprint)\",\n      \"pmids\": [\"bio_10.1101_2024.12.16.627577\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Preprint findings not yet peer-reviewed\",\n        \"How TDM mechanistically promotes VAMP2 over VAMP8 binding is unresolved\",\n        \"Whether STX8 partner switching is sufficient or requires additional host/pathogen factors is unclear\"\n      ]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Identification of VAMP4–STX8 as key SNAREs mediating autophagic secretion of mitochondria via extracellular vesicles under hypoxia expanded STX8's role beyond classical endosome fusion to tumor immunobiology.\",\n      \"evidence\": \"MVB membrane proteomics, molecular interaction validation, and loss-of-function experiments with EV secretion and macrophage polarization readouts in HNSCC\",\n      \"pmids\": [\"41979085\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether VAMP4–STX8 interaction is direct or part of a larger SNARE complex remains uncharacterized\",\n        \"Generalizability of this secretory pathway beyond HNSCC and hypoxia not tested\",\n        \"Structural or regulatory basis for STX8 engagement with VAMP4 versus VAMP8 unknown\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How STX8 SNARE partner selectivity is regulated — canonical (VAMP8) versus non-canonical (VAMP2, VAMP4) complexes — and whether retromer-mediated recycling of STX8 is conserved and functionally important in mammalian cells remain open mechanistic questions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No structural model of STX8-containing SNARE complexes exists\",\n        \"Mammalian retromer recycling of STX8 not directly demonstrated\",\n        \"Post-translational regulation of STX8 partner selectivity is unexplored\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005773\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [1, 2, 4]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"VTI1B\",\n      \"VAMP8\",\n      \"VAMP4\",\n      \"VPS35\",\n      \"SNX3\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"STX8 is an endosomal t-SNARE that assembles with syntaxin 7, vti1b, and VAMP8/endobrevin into a four-helix SNARE core complex to drive late endosome fusion and cargo delivery to lysosomes [PMID:11101518]. It localizes primarily to early and late endosomes, where it mediates clathrin-independent transport from early to late endosomes, and its recycling from the prevacuolar endosome to the trans-Golgi network depends on Snx3-retromer recognition of a non-canonical IEMxxM sorting motif [PMID:10564279, PMID:33788833]. The tumor suppressor Mig-6 bridges internalized EGFR to STX8-dependent late-endosomal trafficking, promoting lysosomal degradation of EGFR; loss of Mig-6 in glioblastoma sustains aberrant EGFR signaling [PMID:20351267]. STX8 is also co-opted by intracellular pathogens and participates in hypoxia-driven autophagic secretion of mitochondria via extracellular vesicles in head and neck squamous cell carcinoma [PMID:41979085].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Identification of STX8 as a novel syntaxin/SNAP-25-subfamily SNARE with a predicted transmembrane anchor established it as a candidate vesicle-trafficking component, though its initial localization was ascribed to the ER.\",\n      \"evidence\": \"cDNA cloning, immunofluorescence co-localization with ER markers, sequence analysis\",\n      \"pmids\": [\"9852078\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Initial ER localization was subsequently revised to endosomes by later studies\",\n        \"No functional data or binding partners identified\"\n      ]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Re-evaluation of STX8 localization placed it predominantly on early endosomes and demonstrated its requirement for clathrin-independent transport from early to late endosomes, resolving its compartmental identity and revealing its trafficking function.\",\n      \"evidence\": \"Immunofluorescence with endosomal markers, co-immunoprecipitation of SNARE complexes, α-SNAP/NSF dissociation assay, functional endocytic trafficking assays\",\n      \"pmids\": [\"10564279\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Identity of cognate SNARE partners not yet determined\",\n        \"Structural basis for STX8 position in the SNARE bundle unknown\"\n      ]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Reconstitution of a quaternary SNARE core complex (syntaxin 7 / STX8 / vti1b / VAMP8) defined the cognate fusion machinery for late endosomes and established that STX8 occupies the SNAP-25 C-terminal helix position.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation of all four SNAREs, in vitro late endosome fusion inhibition with specific antibodies, EGF-to-lysosome degradation assay, biophysical characterization of purified complex\",\n      \"pmids\": [\"11101518\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No high-resolution structure of the endosomal SNARE complex\",\n        \"Regulatory mechanisms controlling complex assembly/disassembly not addressed\"\n      ]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Discovery that the tumor suppressor Mig-6 directly binds STX8 to route EGFR into late endosomes for degradation revealed a mechanism linking receptor tyrosine kinase downregulation to SNARE-dependent trafficking and explained how Mig-6 loss sustains oncogenic signaling in glioblastoma.\",\n      \"evidence\": \"Co-immunoprecipitation of Mig-6–STX8, EGFR degradation/trafficking assays, Mig-6 knockdown/overexpression with phenotypic rescue, in vivo glioma models\",\n      \"pmids\": [\"20351267\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Binding interface between Mig-6 and STX8 not structurally resolved\",\n        \"Whether other RTKs are routed through the same Mig-6–STX8 axis is untested\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Systematic mutagenesis in S. pombe identified an IEMxxM motif as the Snx3-retromer sorting signal for Stx8 recycling from prevacuolar endosome to TGN, defining a non-canonical retromer cargo recognition mechanism.\",\n      \"evidence\": \"Alanine-scanning mutagenesis of sorting motif residues, genetic deletion of retromer/sorting nexin components with trafficking readout, fluorescence microscopy\",\n      \"pmids\": [\"33788833\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Conservation and functional necessity of the IEMxxM motif in mammalian STX8 not tested\",\n        \"Direct structural interaction between Snx3 and the sorting motif not demonstrated\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Photoaffinity labeling showed that mycobacterial trehalose dimycolate binds STX8 and VTI1B, redirecting them into a non-canonical complex with VAMP2 instead of VAMP8, thereby blocking phagosome maturation — revealing a pathogen strategy to subvert endosomal SNARE specificity.\",\n      \"evidence\": \"Clickable TDM photoaffinity probe, mass spectrometry, co-immunoprecipitation of canonical vs. non-canonical SNARE complexes, phagosome maturation and intracellular bacterial replication assays (preprint)\",\n      \"pmids\": [\"bio_10.1101_2024.12.16.627577\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Preprint not yet peer-reviewed\",\n        \"Structural basis for TDM-induced SNARE partner switching unknown\",\n        \"Whether VAMP2 engagement is sufficient or requires additional host factors is unresolved\"\n      ]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"STX8 was identified as a SNARE component of multivesicular body membranes that, together with VAMP4, mediates hypoxia-driven autophagic secretion of mitochondria via extracellular vesicles in HNSCC, linking endosomal SNARE function to tumor immune evasion.\",\n      \"evidence\": \"Multivesicular body membrane proteomics, co-IP/pulldown, functional EV secretion and macrophage polarization assays under hypoxia, knockdown experiments\",\n      \"pmids\": [\"41979085\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single study; independent replication needed\",\n        \"Whether STX8's role in EV-mediated mitophagy extends beyond HNSCC or hypoxic conditions is unknown\",\n        \"Mechanism by which STX8 is recruited to MVB membranes under hypoxia not defined\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A high-resolution structure of the endosomal SNARE complex containing STX8 is lacking, the mammalian retromer sorting motif for STX8 recycling has not been validated, and the full scope of pathogen effectors that co-opt STX8 remains undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No atomic-resolution structure of the STX7/STX8/VTI1B/VAMP8 complex\",\n        \"Mammalian IEMxxM motif conservation and function untested\",\n        \"Breadth of pathogen exploitation of STX8-containing SNARE complexes incompletely mapped\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [2, 3, 4]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [2, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [2, 3, 4, 5]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"complexes\": [\n      \"STX7/STX8/VTI1B/VAMP8 late-endosomal SNARE complex\"\n    ],\n    \"partners\": [\n      \"STX7\",\n      \"VTI1B\",\n      \"VAMP8\",\n      \"ERRFI1\",\n      \"VPS35\",\n      \"SNX3\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}