{"gene":"STX10","run_date":"2026-04-28T21:42:57","timeline":{"discoveries":[{"year":1998,"finding":"Human syntaxin 10 (STX10) was cloned as a new member of the syntaxin family, encoding a 249-amino acid polypeptide with coiled-coil domains and a C-terminal hydrophobic tail. Indirect immunofluorescence with polyclonal antibodies showed localization to intracellular membrane structures with perinuclear staining co-localizing with the Golgi SNARE GS28. Brefeldin A (but not wortmannin) treatment altered the staining pattern, indicating localization to the trans-Golgi network.","method":"Molecular cloning, indirect immunofluorescence, co-localization with Golgi markers, brefeldin A/wortmannin treatment","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization experiment with pharmacological validation; single lab, multiple orthogonal methods","pmids":["9446797"],"is_preprint":false},{"year":2005,"finding":"Human GARP complex (hVps52/53/54) was identified as an interactor of STX10 at the trans-Golgi network, mediated through hVps52. STX10 was identified as the binding partner of the GARP tethering complex in human cells, implicating it in membrane docking and fusion events at the Golgi. This is distinct from yeast, where GARP interacts with Tlg1p (the STX10 ortholog).","method":"Co-immunoprecipitation, subcellular fractionation, immunostaining","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2/3 — reciprocal binding shown by co-IP; single lab","pmids":["15878329"],"is_preprint":false},{"year":2005,"finding":"STX10 co-localizes with syntaxins 6 and 16 at the TGN and co-immunoprecipitates with both. However, STX10 knockdown does not inhibit endosome-to-TGN transport of shiga toxin, does not affect TGN localization of STX6/16, and does not interact with the SM protein Vps45, distinguishing it functionally from the STX16-based SNARE complex. STX10 reciprocally co-immunoprecipitates endosomal syntaxin 12/13, and its knockdown affects surface expression of transferrin receptor (TfR) and induces formation of an immobile TfR pool, suggesting a role at the TGN-endosome boundary.","method":"siRNA knockdown, co-immunoprecipitation, fluorescence microscopy, transport assays (shiga toxin), transferrin receptor surface expression assay","journal":"Molecular membrane biology","confidence":"Medium","confidence_rationale":"Tier 2 — functional KD with defined transport phenotype and binding partner analysis; single lab with multiple orthogonal methods","pmids":["16154903"],"is_preprint":false},{"year":2008,"finding":"A SNARE complex comprising STX10, STX16, Vti1a, and VAMP3 is required for transport of mannose 6-phosphate receptors (MPRs) from late endosomes to the trans-Golgi network (TGN) in human cells, operating downstream of Rab9 GTPase and the tether GCC185. Depletion of STX10 causes MPR missorting and hypersecretion of hexosaminidase. This route is distinct from the STX6-dependent pathway used for TGN46 and cholera toxin transport from early endosomes. Mouse and rat cells lack STX10 and must use a different t-SNARE for this process. GCC185 binds directly to STX16 and is competed by Rab6.","method":"siRNA depletion, co-immunoprecipitation, hexosaminidase secretion assay, MPR localization by immunofluorescence, cholera toxin/TGN46 transport assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal functional assays, reciprocal co-IP of SNARE complex, clear phenotypic readout, strong mechanistic dissection; single rigorous study","pmids":["18195106"],"is_preprint":false},{"year":1999,"finding":"STX10 mRNA is expressed in human peripheral blood lymphocytes and SH-SY5Y neuroblastoma cells but not in human neutrophils or neutrophil-differentiated HL-60 cells, indicating cell-type-specific expression of STX10.","method":"RT-PCR, cloning, sequencing","journal":"Journal of leukocyte biology","confidence":"Low","confidence_rationale":"Tier 3 — expression detection only, no functional mechanistic follow-up for STX10 specifically","pmids":["10080545"],"is_preprint":false},{"year":2021,"finding":"Using BioID proximity labeling with BirA*-Stx10 fusion constructs, a novel eukaryotic protein-protein interaction between STX10 and VAPB was identified in human cells. However, the BirA* tag altered STX10 localization during Chlamydia trachomatis and Coxiella burnetii infection, limiting interpretation of infection-context data.","method":"BioID proximity labeling, mass spectrometry","journal":"Pathogens and disease","confidence":"Low","confidence_rationale":"Tier 3 — single proximity labeling experiment; authors note BirA* tag artifacts; no functional validation of STX10-VAPB interaction","pmids":["34323972"],"is_preprint":false}],"current_model":"STX10 is a trans-Golgi network-localized SNARE protein that forms a complex with STX16, Vti1a, and VAMP3 to mediate Rab9-dependent retrograde transport of mannose 6-phosphate receptors from late endosomes to the TGN (a route distinct from the STX6/STX16-dependent pathway for TGN46 transport); it also interacts with the GARP tethering complex via hVps52, interacts with endosomal syntaxin 12/13, and influences transferrin receptor surface expression, and a proximity labeling study identified VAPB as a novel interaction partner."},"narrative":{"teleology":[{"year":1998,"claim":"Cloning of STX10 established it as a new syntaxin-family SNARE localized to intracellular membranes overlapping with TGN markers, placing it in the Golgi/TGN trafficking machinery.","evidence":"Molecular cloning, indirect immunofluorescence co-localization with GS28, brefeldin A sensitivity in human cells","pmids":["9446797"],"confidence":"Medium","gaps":["No functional assay was performed; localization was inferred from a single Golgi marker and pharmacological perturbation","Binding partners and SNARE complex composition unknown"]},{"year":2005,"claim":"Identification of the GARP tethering complex (hVps52/53/54) as a STX10 interactor via hVps52 connected vesicle tethering to SNARE-mediated fusion at the TGN, and simultaneous functional studies showed STX10 is dispensable for shiga toxin retrograde transport but influences transferrin receptor surface levels through interaction with syntaxin 12/13.","evidence":"Co-immunoprecipitation of GARP–STX10; siRNA knockdown with shiga toxin transport and transferrin receptor assays; co-IP of STX10 with syntaxin 12/13","pmids":["15878329","16154903"],"confidence":"Medium","gaps":["The specific cargo pathway requiring STX10 was not yet defined","SNARE complex partners beyond STX6/STX16 interaction were unresolved","Mechanism linking STX10 knockdown to altered transferrin receptor dynamics was not elucidated"]},{"year":2008,"claim":"Defining the STX10/STX16/Vti1a/VAMP3 quaternary SNARE complex and its requirement for Rab9-dependent MPR retrieval from late endosomes to the TGN resolved which cargo route STX10 operates in and distinguished it from the STX6-dependent early-endosome pathway.","evidence":"siRNA depletion of individual SNAREs, co-immunoprecipitation of the quaternary complex, hexosaminidase secretion and MPR localization assays, cholera toxin/TGN46 transport controls in human cells","pmids":["18195106"],"confidence":"High","gaps":["Structural basis for complex assembly and selectivity over the STX6-containing complex is unknown","Mouse and rat cells lack STX10; the compensating SNARE in these species has not been identified","Whether the STX10-dependent pathway contributes to pathologies involving lysosomal enzyme missorting has not been tested"]},{"year":2021,"claim":"Proximity labeling identified VAPB as a novel STX10-proximal protein, suggesting a potential ER–TGN membrane contact site connection, though functional validation is lacking.","evidence":"BioID proximity labeling with BirA*-Stx10 and mass spectrometry in human cells (tag artifacts noted by authors)","pmids":["34323972"],"confidence":"Low","gaps":["No reciprocal validation or functional assay for the STX10–VAPB interaction","BirA* tag altered STX10 localization, limiting confidence in interactome data","Physiological relevance of a STX10–VAPB link to ER–TGN contact sites is untested"]},{"year":null,"claim":"The structural basis for STX10 selectivity within the TGN SNARE network, the identity of the compensating SNARE in rodents that lack STX10, and the functional significance of the STX10–VAPB proximity remain open questions.","evidence":"","pmids":[],"confidence":"High","gaps":["No crystal or cryo-EM structure of the STX10-containing SNARE complex","Rodent compensatory mechanism for MPR retrieval without STX10 is uncharacterized","In vivo relevance of STX10 loss in human tissues or disease models has not been assessed"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,3]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[0,1,2,3]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[2,3]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[1,2,3]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[3]}],"complexes":["STX10/STX16/Vti1a/VAMP3 SNARE complex"],"partners":["STX16","VTI1A","VAMP3","VPS52","STX12","GCC185"],"other_free_text":[]},"mechanistic_narrative":"STX10 is a trans-Golgi network (TGN)-localized SNARE protein that participates in retrograde membrane trafficking between endosomes and the TGN. It forms a quaternary SNARE complex with STX16, Vti1a, and VAMP3 that operates downstream of Rab9 and the tether GCC185 to mediate mannose 6-phosphate receptor (MPR) retrieval from late endosomes to the TGN; depletion of STX10 causes MPR missorting and hypersecretion of lysosomal enzymes, defining a transport route distinct from the STX6-dependent pathway used for TGN46 and cholera toxin [PMID:18195106]. STX10 interacts with the GARP tethering complex via hVps52, linking vesicle docking to SNARE-mediated fusion at the TGN [PMID:15878329], and also co-immunoprecipitates endosomal syntaxin 12/13; its knockdown alters transferrin receptor surface expression, indicating an additional role at the TGN–endosome boundary [PMID:16154903]."},"prefetch_data":{"uniprot":{"accession":"O60499","full_name":"Syntaxin-10","aliases":[],"length_aa":249,"mass_kda":28.1,"function":"SNARE involved in vesicular transport from the late endosomes to the trans-Golgi network","subcellular_location":"Golgi apparatus membrane","url":"https://www.uniprot.org/uniprotkb/O60499/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/STX10","classification":"Not Classified","n_dependent_lines":38,"n_total_lines":1208,"dependency_fraction":0.03145695364238411},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000104915","cell_line_id":"CID000760","localizations":[{"compartment":"vesicles","grade":3},{"compartment":"er","grade":1},{"compartment":"membrane","grade":1}],"interactors":[{"gene":"STX16","stoichiometry":10.0},{"gene":"VTI1A","stoichiometry":10.0},{"gene":"STX16;STX16-NPEPL1","stoichiometry":4.0},{"gene":"VPS45","stoichiometry":4.0},{"gene":"CLTA","stoichiometry":0.2},{"gene":"VAMP4","stoichiometry":0.2},{"gene":"NSF","stoichiometry":0.2},{"gene":"SCFD1","stoichiometry":0.2},{"gene":"NAPA","stoichiometry":0.2},{"gene":"VAMP3;VAMP2","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000760","total_profiled":1310},"omim":[{"mim_id":"615850","title":"VPS53 SUBUNIT OF GARP COMPLEX; VPS53","url":"https://www.omim.org/entry/615850"},{"mim_id":"614633","title":"VPS54 SUBUNIT OF GARP COMPLEX; VPS54","url":"https://www.omim.org/entry/614633"},{"mim_id":"603765","title":"SYNTAXIN 10; STX10","url":"https://www.omim.org/entry/603765"},{"mim_id":"603443","title":"VPS52 SUBUNIT OF GARP COMPLEX; VPS52","url":"https://www.omim.org/entry/603443"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Golgi apparatus","reliability":"Supported"},{"location":"Vesicles","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/STX10"},"hgnc":{"alias_symbol":["hsyn10","SYN10"],"prev_symbol":[]},"alphafold":{"accession":"O60499","domains":[{"cath_id":"1.20.58.90","chopping":"1-122","consensus_level":"medium","plddt":87.7253,"start":1,"end":122},{"cath_id":"1.20.5","chopping":"215-247","consensus_level":"high","plddt":86.27,"start":215,"end":247}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O60499","model_url":"https://alphafold.ebi.ac.uk/files/AF-O60499-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O60499-F1-predicted_aligned_error_v6.png","plddt_mean":80.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=STX10","jax_strain_url":"https://www.jax.org/strain/search?query=STX10"},"sequence":{"accession":"O60499","fasta_url":"https://rest.uniprot.org/uniprotkb/O60499.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O60499/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O60499"}},"corpus_meta":[{"pmid":"31420334","id":"PMC_31420334","title":"Genomic and transcriptomic association studies identify 16 novel susceptibility loci for venous thromboembolism.","date":"2019","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/31420334","citation_count":182,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"25248552","id":"PMC_25248552","title":"Genome-wide analysis of alternative splicing in Zea mays: landscape and genetic regulation.","date":"2014","source":"The Plant cell","url":"https://pubmed.ncbi.nlm.nih.gov/25248552","citation_count":162,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"18195106","id":"PMC_18195106","title":"A syntaxin 10-SNARE complex distinguishes two distinct transport routes from endosomes to the trans-Golgi in human cells.","date":"2008","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/18195106","citation_count":144,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"15288384","id":"PMC_15288384","title":"Narcotic antagonists in drug dependence: pilot study showing enhancement of compliance with SYN-10, amino-acid precursors and enkephalinase inhibition therapy.","date":"2004","source":"Medical hypotheses","url":"https://pubmed.ncbi.nlm.nih.gov/15288384","citation_count":47,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"21718468","id":"PMC_21718468","title":"Genome-wide expression quantitative trait loci (eQTL) analysis in maize.","date":"2011","source":"BMC genomics","url":"https://pubmed.ncbi.nlm.nih.gov/21718468","citation_count":47,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"32594266","id":"PMC_32594266","title":"A combination of linkage mapping and GWAS brings new elements on the genetic basis of yield-related traits in maize across multiple environments.","date":"2020","source":"TAG. 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communications","url":"https://pubmed.ncbi.nlm.nih.gov/30194290","citation_count":73,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"36138187","id":"PMC_36138187","title":"NUDT21 limits CD19 levels through alternative mRNA polyadenylation in B cell acute lymphoblastic leukemia.","date":"2022","source":"Nature immunology","url":"https://pubmed.ncbi.nlm.nih.gov/36138187","citation_count":46,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"16154903","id":"PMC_16154903","title":"Trans-Golgi network syntaxin 10 functions distinctly from syntaxins 6 and 16.","date":"2005","source":"Molecular membrane biology","url":"https://pubmed.ncbi.nlm.nih.gov/16154903","citation_count":45,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"34369648","id":"PMC_34369648","title":"BioID reveals an ATG9A interaction with ATG13-ATG101 in the degradation of p62/SQSTM1-ubiquitin clusters.","date":"2021","source":"EMBO reports","url":"https://pubmed.ncbi.nlm.nih.gov/34369648","citation_count":42,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"27791468","id":"PMC_27791468","title":"The STX6-VTI1B-VAMP3 complex facilitates xenophagy by regulating the fusion between recycling endosomes and autophagosomes.","date":"2016","source":"Autophagy","url":"https://pubmed.ncbi.nlm.nih.gov/27791468","citation_count":39,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"36610398","id":"PMC_36610398","title":"Evolutionarily conserved regulators of tau identify targets for new therapies.","date":"2023","source":"Neuron","url":"https://pubmed.ncbi.nlm.nih.gov/36610398","citation_count":39,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"34597346","id":"PMC_34597346","title":"The proximal proteome of 17 SARS-CoV-2 proteins links to disrupted antiviral signaling and host translation.","date":"2021","source":"PLoS 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biology","url":"https://pubmed.ncbi.nlm.nih.gov/33087821","citation_count":26,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":14432,"output_tokens":1020,"usd":0.029298},"stage2":{"model":"claude-opus-4-6","input_tokens":4218,"output_tokens":1221,"usd":0.077423},"total_usd":0.264122,"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":27649,"output_tokens":1741,"usd":0.054531},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":5211,"output_tokens":1701,"usd":0.10287}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"Human syntaxin 10 (STX10) is a member of the syntaxin family localized to the trans-Golgi network (TGN), as demonstrated by indirect immunofluorescence showing perinuclear staining co-localizing with the Golgi SNARE GS28, and morphological alteration of staining pattern upon brefeldin A (but not wortmannin) treatment.\",\n      \"method\": \"Indirect immunofluorescence, brefeldin A/wortmannin treatment, subcellular localization\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiment with functional/pharmacological validation, single lab\",\n      \"pmids\": [\"9446797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"STX10 forms a SNARE complex with STX16, Vti1a, and VAMP3 that is specifically required for mannose 6-phosphate receptor (MPR) retrograde transport from endosomes to the trans-Golgi network (TGN). Depletion of STX10 leads to MPR missorting and hypersecretion of hexosaminidase. This pathway is distinct from the STX6-dependent transport of TGN46 or cholera toxin from early endosomes. Mouse and rat cells lack STX10 and use a different t-SNARE for this process.\",\n      \"method\": \"siRNA depletion, co-immunoprecipitation, hexosaminidase secretion assay, MPR localization by immunofluorescence\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, functional KD with defined cargo missorting phenotype, pathway distinction established, replicated with multiple orthogonal readouts\",\n      \"pmids\": [\"18195106\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The tethering factor GCC185 binds directly to STX16 (within the STX10-containing SNARE complex) and this interaction is competed by Rab6, suggesting Rab GTPases regulate SNARE-tether interactions at the TGN.\",\n      \"method\": \"Direct binding assay, competition experiment with Rab6\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — in vitro direct binding assay with competition, functionally contextualized within the STX10 SNARE pathway\",\n      \"pmids\": [\"18195106\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"STX10 (Stx10) was previously shown to be important for chlamydial growth and development, and using BioID proximity labeling, a novel protein-protein interaction between Stx10 and VAPB was identified in eukaryotic cells.\",\n      \"method\": \"BioID proximity labeling, mass spectrometry\",\n      \"journal\": \"Pathogens and disease\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single proximity labeling experiment, no functional validation of the Stx10-VAPB interaction\",\n      \"pmids\": [\"34323972\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"STX10 is a trans-Golgi network-localized SNARE protein that forms a complex with STX16, Vti1a, and VAMP3 to mediate retrograde transport of mannose 6-phosphate receptors from endosomes to the TGN; this pathway is regulated by the tethering factor GCC185 (which binds STX16 and is competed by Rab6) and is distinct from the STX6-dependent route used by TGN46 and cholera toxin.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"Human syntaxin 10 (STX10) was cloned as a new member of the syntaxin family, encoding a 249-amino acid polypeptide with coiled-coil domains and a C-terminal hydrophobic tail. Indirect immunofluorescence with polyclonal antibodies showed localization to intracellular membrane structures with perinuclear staining co-localizing with the Golgi SNARE GS28. Brefeldin A (but not wortmannin) treatment altered the staining pattern, indicating localization to the trans-Golgi network.\",\n      \"method\": \"Molecular cloning, indirect immunofluorescence, co-localization with Golgi markers, brefeldin A/wortmannin treatment\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiment with pharmacological validation; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"9446797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Human GARP complex (hVps52/53/54) was identified as an interactor of STX10 at the trans-Golgi network, mediated through hVps52. STX10 was identified as the binding partner of the GARP tethering complex in human cells, implicating it in membrane docking and fusion events at the Golgi. This is distinct from yeast, where GARP interacts with Tlg1p (the STX10 ortholog).\",\n      \"method\": \"Co-immunoprecipitation, subcellular fractionation, immunostaining\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — reciprocal binding shown by co-IP; single lab\",\n      \"pmids\": [\"15878329\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"STX10 co-localizes with syntaxins 6 and 16 at the TGN and co-immunoprecipitates with both. However, STX10 knockdown does not inhibit endosome-to-TGN transport of shiga toxin, does not affect TGN localization of STX6/16, and does not interact with the SM protein Vps45, distinguishing it functionally from the STX16-based SNARE complex. STX10 reciprocally co-immunoprecipitates endosomal syntaxin 12/13, and its knockdown affects surface expression of transferrin receptor (TfR) and induces formation of an immobile TfR pool, suggesting a role at the TGN-endosome boundary.\",\n      \"method\": \"siRNA knockdown, co-immunoprecipitation, fluorescence microscopy, transport assays (shiga toxin), transferrin receptor surface expression assay\",\n      \"journal\": \"Molecular membrane biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional KD with defined transport phenotype and binding partner analysis; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"16154903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"A SNARE complex comprising STX10, STX16, Vti1a, and VAMP3 is required for transport of mannose 6-phosphate receptors (MPRs) from late endosomes to the trans-Golgi network (TGN) in human cells, operating downstream of Rab9 GTPase and the tether GCC185. Depletion of STX10 causes MPR missorting and hypersecretion of hexosaminidase. This route is distinct from the STX6-dependent pathway used for TGN46 and cholera toxin transport from early endosomes. Mouse and rat cells lack STX10 and must use a different t-SNARE for this process. GCC185 binds directly to STX16 and is competed by Rab6.\",\n      \"method\": \"siRNA depletion, co-immunoprecipitation, hexosaminidase secretion assay, MPR localization by immunofluorescence, cholera toxin/TGN46 transport assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal functional assays, reciprocal co-IP of SNARE complex, clear phenotypic readout, strong mechanistic dissection; single rigorous study\",\n      \"pmids\": [\"18195106\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"STX10 mRNA is expressed in human peripheral blood lymphocytes and SH-SY5Y neuroblastoma cells but not in human neutrophils or neutrophil-differentiated HL-60 cells, indicating cell-type-specific expression of STX10.\",\n      \"method\": \"RT-PCR, cloning, sequencing\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — expression detection only, no functional mechanistic follow-up for STX10 specifically\",\n      \"pmids\": [\"10080545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Using BioID proximity labeling with BirA*-Stx10 fusion constructs, a novel eukaryotic protein-protein interaction between STX10 and VAPB was identified in human cells. However, the BirA* tag altered STX10 localization during Chlamydia trachomatis and Coxiella burnetii infection, limiting interpretation of infection-context data.\",\n      \"method\": \"BioID proximity labeling, mass spectrometry\",\n      \"journal\": \"Pathogens and disease\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single proximity labeling experiment; authors note BirA* tag artifacts; no functional validation of STX10-VAPB interaction\",\n      \"pmids\": [\"34323972\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"STX10 is a trans-Golgi network-localized SNARE protein that forms a complex with STX16, Vti1a, and VAMP3 to mediate Rab9-dependent retrograde transport of mannose 6-phosphate receptors from late endosomes to the TGN (a route distinct from the STX6/STX16-dependent pathway for TGN46 transport); it also interacts with the GARP tethering complex via hVps52, interacts with endosomal syntaxin 12/13, and influences transferrin receptor surface expression, and a proximity labeling study identified VAPB as a novel interaction partner.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"STX10 is a SNARE protein localized to the trans-Golgi network (TGN) that forms a complex with STX16, Vti1a, and VAMP3 to mediate retrograde transport of mannose 6-phosphate receptors (MPRs) from endosomes to the TGN; depletion of STX10 causes MPR missorting and hypersecretion of hexosaminidase [PMID:18195106]. This STX10-dependent pathway is distinct from the STX6-dependent route used by TGN46 and cholera toxin, and the tethering factor GCC185 binds directly to STX16 within the STX10-containing complex, with Rab6 competing for this interaction to regulate SNARE-tether coupling [PMID:18195106]. STX10 is absent from mouse and rat genomes, indicating that rodent cells employ a different t-SNARE for this retrograde trafficking step [PMID:18195106].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Establishing that STX10 is a TGN-resident syntaxin resolved where in the cell this previously uncharacterized SNARE operates, placing it at a major sorting hub.\",\n      \"evidence\": \"Indirect immunofluorescence showing perinuclear co-localization with GS28, sensitivity to brefeldin A but not wortmannin in human cells\",\n      \"pmids\": [\"9446797\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No SNARE complex partners identified\",\n        \"No cargo or trafficking pathway assigned\",\n        \"Single-lab observation without independent confirmation\"\n      ]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identification of the STX10/STX16/Vti1a/VAMP3 SNARE complex and its specific requirement for MPR retrograde transport defined the molecular machinery and cargo specificity of this pathway, and demonstrated that GCC185 tethering is coupled to this complex via Rab6-regulable binding to STX16.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation, siRNA depletion with MPR missorting and hexosaminidase secretion phenotype, direct binding and Rab6 competition assays in human cells\",\n      \"pmids\": [\"18195106\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of the four-SNARE complex is unresolved\",\n        \"Mechanism by which Rab6-GCC185 competition is temporally regulated is unknown\",\n        \"Whether STX10 participates in additional trafficking routes beyond MPR transport has not been tested\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Proximity labeling identified VAPB as a candidate STX10 interactor, suggesting a possible link between the STX10 SNARE pathway and ER-TGN membrane contact sites.\",\n      \"evidence\": \"BioID proximity labeling and mass spectrometry in eukaryotic cells\",\n      \"pmids\": [\"34323972\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"STX10-VAPB interaction lacks reciprocal validation or functional confirmation\",\n        \"Relevance to MPR retrograde transport not addressed\",\n        \"No direct binding assay performed\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis of the STX10-containing SNARE complex, additional cargo beyond MPRs, and the functional significance of the STX10-VAPB proximity remain open questions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No structural model of the STX10/STX16/Vti1a/VAMP3 complex exists\",\n        \"Whether STX10 functions in any pathway besides late-endosome-to-TGN retrograde transport is untested\",\n        \"Mechanism compensating for STX10 absence in rodent cells is undefined\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"complexes\": [\n      \"STX10/STX16/Vti1a/VAMP3 SNARE complex\"\n    ],\n    \"partners\": [\n      \"STX16\",\n      \"VTI1A\",\n      \"VAMP3\",\n      \"GCC185\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"STX10 is a trans-Golgi network (TGN)-localized SNARE protein that participates in retrograde membrane trafficking between endosomes and the TGN. It forms a quaternary SNARE complex with STX16, Vti1a, and VAMP3 that operates downstream of Rab9 and the tether GCC185 to mediate mannose 6-phosphate receptor (MPR) retrieval from late endosomes to the TGN; depletion of STX10 causes MPR missorting and hypersecretion of lysosomal enzymes, defining a transport route distinct from the STX6-dependent pathway used for TGN46 and cholera toxin [PMID:18195106]. STX10 interacts with the GARP tethering complex via hVps52, linking vesicle docking to SNARE-mediated fusion at the TGN [PMID:15878329], and also co-immunoprecipitates endosomal syntaxin 12/13; its knockdown alters transferrin receptor surface expression, indicating an additional role at the TGN–endosome boundary [PMID:16154903].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Cloning of STX10 established it as a new syntaxin-family SNARE localized to intracellular membranes overlapping with TGN markers, placing it in the Golgi/TGN trafficking machinery.\",\n      \"evidence\": \"Molecular cloning, indirect immunofluorescence co-localization with GS28, brefeldin A sensitivity in human cells\",\n      \"pmids\": [\"9446797\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No functional assay was performed; localization was inferred from a single Golgi marker and pharmacological perturbation\",\n        \"Binding partners and SNARE complex composition unknown\"\n      ]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identification of the GARP tethering complex (hVps52/53/54) as a STX10 interactor via hVps52 connected vesicle tethering to SNARE-mediated fusion at the TGN, and simultaneous functional studies showed STX10 is dispensable for shiga toxin retrograde transport but influences transferrin receptor surface levels through interaction with syntaxin 12/13.\",\n      \"evidence\": \"Co-immunoprecipitation of GARP–STX10; siRNA knockdown with shiga toxin transport and transferrin receptor assays; co-IP of STX10 with syntaxin 12/13\",\n      \"pmids\": [\"15878329\", \"16154903\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"The specific cargo pathway requiring STX10 was not yet defined\",\n        \"SNARE complex partners beyond STX6/STX16 interaction were unresolved\",\n        \"Mechanism linking STX10 knockdown to altered transferrin receptor dynamics was not elucidated\"\n      ]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defining the STX10/STX16/Vti1a/VAMP3 quaternary SNARE complex and its requirement for Rab9-dependent MPR retrieval from late endosomes to the TGN resolved which cargo route STX10 operates in and distinguished it from the STX6-dependent early-endosome pathway.\",\n      \"evidence\": \"siRNA depletion of individual SNAREs, co-immunoprecipitation of the quaternary complex, hexosaminidase secretion and MPR localization assays, cholera toxin/TGN46 transport controls in human cells\",\n      \"pmids\": [\"18195106\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis for complex assembly and selectivity over the STX6-containing complex is unknown\",\n        \"Mouse and rat cells lack STX10; the compensating SNARE in these species has not been identified\",\n        \"Whether the STX10-dependent pathway contributes to pathologies involving lysosomal enzyme missorting has not been tested\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Proximity labeling identified VAPB as a novel STX10-proximal protein, suggesting a potential ER–TGN membrane contact site connection, though functional validation is lacking.\",\n      \"evidence\": \"BioID proximity labeling with BirA*-Stx10 and mass spectrometry in human cells (tag artifacts noted by authors)\",\n      \"pmids\": [\"34323972\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No reciprocal validation or functional assay for the STX10–VAPB interaction\",\n        \"BirA* tag altered STX10 localization, limiting confidence in interactome data\",\n        \"Physiological relevance of a STX10–VAPB link to ER–TGN contact sites is untested\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis for STX10 selectivity within the TGN SNARE network, the identity of the compensating SNARE in rodents that lack STX10, and the functional significance of the STX10–VAPB proximity remain open questions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No crystal or cryo-EM structure of the STX10-containing SNARE complex\",\n        \"Rodent compensatory mechanism for MPR retrieval without STX10 is uncharacterized\",\n        \"In vivo relevance of STX10 loss in human tissues or disease models has not been assessed\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0, 1, 2, 3]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [2, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [1, 2, 3]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"complexes\": [\n      \"STX10/STX16/Vti1a/VAMP3 SNARE complex\"\n    ],\n    \"partners\": [\n      \"STX16\",\n      \"VTI1A\",\n      \"VAMP3\",\n      \"VPS52\",\n      \"STX12\",\n      \"GCC185\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}