{"gene":"SNAPC1","run_date":"2026-06-10T07:46:37","timeline":{"discoveries":[{"year":1995,"finding":"SNAPC1 (SNAP43) was identified as a subunit of the SNAPc (also called PTF) complex, which is a TBP-TAF complex required for transcription of both RNA polymerase II and III snRNA genes. SNAPc binds specifically to the proximal sequence element (PSE), a non-TATA-box basal promoter element common to both gene types.","method":"Biochemical purification, TBP-TAF complex characterization, PSE-binding assay, in vitro transcription","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — biochemical reconstitution and in vitro transcription assays, foundational paper replicated by multiple subsequent studies","pmids":["7715707"],"is_preprint":false},{"year":1996,"finding":"SNAPC1 (SNAP43) is required for both RNA polymerase II and III transcription of snRNA genes in vitro. SNAP43 interacts with SNAP50 by co-immunoprecipitation but does not interact with SNAP45 or TBP.","method":"Antibody depletion of SNAPc from nuclear extracts, in vitro transcription, co-immunoprecipitation","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro transcription with antibody depletion plus co-IP, replicated by later reconstitution studies","pmids":["9003788"],"is_preprint":false},{"year":1996,"finding":"SNAP45 interacts with TBP and is required for both RNA polymerase II and III snRNA gene transcription; this established that SNAPC1 (SNAP43) resides in a complex that also contains TBP-interacting subunit SNAP45.","method":"Co-immunoprecipitation, electrophoretic mobility shift assay with antibody supershift, in vitro transcription","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — SNAP45 function defined with EMSA and transcription assay; SNAPC1/SNAP43 position in complex confirmed contextually, single lab","pmids":["8633057"],"is_preprint":false},{"year":1998,"finding":"Recombinant SNAPc was reconstituted from five subunits (SNAP43, SNAP45, SNAP50, SNAP190, and the newly identified SNAP19), confirming that this defined complex binds specifically to the PSE and directs both RNA polymerase II and III snRNA gene transcription.","method":"Recombinant protein reconstitution, PSE binding assay, in vitro transcription","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — full reconstitution from defined recombinant subunits with functional validation in transcription assay","pmids":["9732265"],"is_preprint":false},{"year":1998,"finding":"The genomic structure of the human PTFgamma/SNAP43 gene was determined: it spans ~29 kb, contains 9 exons and 8 introns, and maps to chromosome 14q22 by FISH. The gene lacks a TATA box but has Sp1, Oct1, NF1, AP1, E2F, and USF binding sites in its promoter, and has a VNTR in its 5'-UTR.","method":"Genomic cloning, primer extension, fluorescence in situ hybridization (FISH)","journal":"Journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct genomic characterization and chromosomal localization by FISH, single lab","pmids":["9644240"],"is_preprint":false},{"year":2000,"finding":"A detailed map of subunit-subunit contacts within SNAPc was defined: SNAPC1 (SNAP43) contacts were mapped to specific domains, and complexes retaining only the interaction domains bound specifically to the PSE, establishing the minimal architecture for PSE recognition.","method":"Co-immunoprecipitation, deletion mapping, PSE binding assay (EMSA)","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic deletion analysis with functional PSE-binding readout, single lab","pmids":["11056176"],"is_preprint":false},{"year":2002,"finding":"A mini-SNAPc composed of SNAP43, SNAP50, and the N-terminal third of SNAP190 binds cooperatively with TBP to the core U6 promoter. A 50-amino-acid region within SNAP190 is required for cooperative binding with TBP in the context of mini-SNAPc. Derivatives of mini-SNAPc lacking this region are still transcriptionally active.","method":"Recombinant protein reconstitution, PSE/TATA promoter binding assay, in vitro transcription","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution with defined recombinant subunits including SNAP43, in vitro transcription and binding assays, multiple mutants tested","pmids":["12391172"],"is_preprint":false},{"year":2003,"finding":"SNAPC1 (SNAP43) directly interacts with the TBP DNA binding domain, contributing to TBP recruitment to the U6 TATA box. This interaction, along with that of SNAP190, helps assemble a RNA polymerase III-specific preinitiation complex.","method":"TBP recruitment assay, direct protein-protein interaction assay, reconstituted mini-SNAPc (SNAP43 + SNAP50 + truncated SNAP190)","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct interaction demonstrated with reconstituted components, single lab, functional TBP recruitment readout","pmids":["12621023"],"is_preprint":false},{"year":2004,"finding":"The Drosophila ortholog of SNAPC1 (SNAP43), DmPBP45, shows conformationally distinct DNA cross-linking patterns when bound to U1 versus U6 PSEs — cross-linking strongly for two helical turns downstream of U1 PSE but only half a turn downstream of U6 PSE. This conformational difference is consistent with a model where PBP conformation determines which RNA polymerase is recruited.","method":"Photo-cross-linking, S2 cell expression, functional PSE-binding assay","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — photo-cross-linking with functional PSE-binding assay in Drosophila ortholog, single lab","pmids":["14966271"],"is_preprint":false},{"year":2006,"finding":"SNAP43 participates in direct DNA contacts during PSE recognition by SNAPc. A partial recombinant SNAPc containing SNAP190 (1-505), SNAP50, SNAP43, and SNAP19 expressed in E. coli binds DNA specifically, recruits TBP to U6 promoter DNA, and supports transcription of human U1 and U6 snRNA genes by RNA polymerases II and III.","method":"E. coli co-expression system, PSE DNA binding assay, TBP recruitment assay, reconstituted in vitro transcription","journal":"Protein expression and purification","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — functional reconstitution in E. coli with in vitro transcription, single lab, recapitulates prior baculovirus results","pmids":["16603380"],"is_preprint":false},{"year":2012,"finding":"SNAPC1 occupies not only snRNA gene loci but also a large number of transcriptionally active protein-coding genes genome-wide, mirroring elongating RNA polymerase II across gene bodies and 3' ends. Inhibition of transcriptional elongation causes loss of SNAPC1 from gene 3' ends. Depletion of SNAPC1 diminishes transcriptional responsiveness of many genes to EGF and retinoic acid stimulation, establishing SNAPC1 as a general transcriptional coactivator functioning through elongating RNAPII.","method":"ChIP-seq with anti-SNAPC1 antibodies, SNAPC1 knockdown (siRNA/shRNA), RT-qPCR/RNA-seq for EGF and RA responsiveness, transcriptional elongation inhibitor treatment","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP-seq genome-wide occupancy combined with functional knockdown and multiple stimuli, multiple orthogonal methods in single study","pmids":["22966203"],"is_preprint":false},{"year":2022,"finding":"Cryo-EM structure of human mini-SNAPc (SNAP190 N-terminal domain, SNAP50, SNAP43) in complex with the human U6-1 PSE was determined at 3.49 Å resolution. The structure reveals how the three subunits assemble into a stable mini-SNAPc in a 'wrap-around' mode on the PSE, with three important motifs of SNAP50 mediating both major groove and minor groove recognition of PSE in coordination with the Myb domain of SNAP190.","method":"Cryo-electron microscopy structure determination, structural analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure at 3.49 Å with SNAPC1/SNAP43 directly visualized in complex, high-resolution mechanistic insight","pmids":["36369505"],"is_preprint":false},{"year":2025,"finding":"SNAPC1 is SUMOylated at lysine residues K245 and K333. A SUMOylation-deficient SNAPC1 mutant (2KR) is unable to sustain basal levels of snRNA transcription. While SNAPC1 2KR can still interact with SNAPC3 and is recruited to the PSE, its interaction with SNAPC4 is impaired, indicating that SUMOylation of SNAPC1 is required for proper SNAPc complex assembly and snRNA transcription.","method":"CRISPR/dCas9-SENP1 targeted deSUMOylation, site-directed mutagenesis (K245R/K333R), inducible degron depletion system, co-immunoprecipitation (endogenous-tagged SNAPC3 and SNAPC4), ChIP for PSE recruitment, snRNA expression assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods including targeted SUMO protease, mutagenesis, degron depletion, and co-IP, functional transcription readout","pmids":["40956881"],"is_preprint":false}],"current_model":"SNAPC1 (SNAP43) is a core subunit of the SNAPc/PTF complex that binds the PSE promoter element to initiate transcription of snRNA genes by both RNA polymerases II and III; cryo-EM structures show it participates in a 'wrap-around' PSE-binding mode with SNAP50 and SNAP190, it directly contacts TBP to facilitate preinitiation complex assembly, its SUMOylation at K245/K333 is required for interaction with SNAPC4 and for sustained snRNA transcription, and beyond snRNA genes it associates with elongating RNAPII at protein-coding genes to function as a general transcriptional coactivator required for stimulus-responsive gene expression."},"narrative":{"mechanistic_narrative":"SNAPC1 (SNAP43) is a core subunit of the SNAPc (PTF) complex, a TBP-containing assembly that binds the proximal sequence element (PSE) to direct transcription of snRNA genes by both RNA polymerase II and III [PMID:7715707, PMID:9732265]. Within SNAPc, SNAP43 contacts SNAP50 and the N-terminal region of SNAP190 to form a minimal PSE-binding module, and cryo-EM of this mini-SNAPc on the U6 PSE reveals a 'wrap-around' DNA recognition mode in which SNAP50 motifs and the SNAP190 Myb domain engage both grooves of the element [PMID:9003788, PMID:12391172, PMID:36369505]. SNAP43 also directly contacts the TBP DNA-binding domain, contributing to TBP recruitment and assembly of an RNA polymerase III-specific preinitiation complex on the U6 promoter [PMID:12621023]. SUMOylation of SNAPC1 at K245 and K333 is required for its interaction with SNAPC4 and for sustained basal snRNA transcription, linking a post-translational modification to proper complex assembly [PMID:40956881]. Beyond snRNA genes, SNAPC1 occupies transcriptionally active protein-coding loci genome-wide, tracking with elongating RNA polymerase II across gene bodies and 3' ends, and its depletion blunts transcriptional responses to EGF and retinoic acid, establishing a broader role as a general transcriptional coactivator [PMID:22966203].","teleology":[{"year":1995,"claim":"Established SNAP43 as a subunit of a PSE-binding TBP-TAF complex required for snRNA gene transcription by both Pol II and Pol III, defining the foundational machinery.","evidence":"Biochemical purification of SNAPc/PTF, PSE-binding and in vitro transcription assays","pmids":["7715707"],"confidence":"High","gaps":["Individual subunit contributions not yet resolved","No structural detail of PSE recognition"]},{"year":1996,"claim":"Defined the immediate protein neighborhood of SNAP43 within SNAPc and confirmed its functional requirement, showing it binds SNAP50 but not SNAP45 or TBP directly.","evidence":"Antibody depletion plus in vitro transcription and co-immunoprecipitation; companion work placing SNAP45 as the TBP-contacting subunit","pmids":["9003788","8633057"],"confidence":"High","gaps":["Did not map contact domains","Subunit stoichiometry undefined"]},{"year":1998,"claim":"Demonstrated that a defined five-subunit recombinant SNAPc is sufficient for specific PSE binding and snRNA transcription, proving the complete subunit roster.","evidence":"Recombinant reconstitution from SNAP43/45/50/190/19 with PSE binding and in vitro transcription","pmids":["9732265"],"confidence":"High","gaps":["No structural model","Mechanism distinguishing Pol II vs Pol III recruitment unresolved"]},{"year":2000,"claim":"Mapped the minimal subunit-subunit contact architecture, showing interaction domains alone reconstitute PSE-specific binding.","evidence":"Deletion mapping with co-IP and EMSA PSE-binding readout","pmids":["11056176"],"confidence":"Medium","gaps":["Single-lab mapping","Atomic detail of contacts unknown"]},{"year":2002,"claim":"Showed that a mini-SNAPc (SNAP43, SNAP50, SNAP190 N-terminus) binds the U6 promoter cooperatively with TBP, identifying the minimal transcriptionally competent module.","evidence":"Recombinant mini-SNAPc reconstitution, PSE/TATA binding and in vitro transcription","pmids":["12391172"],"confidence":"High","gaps":["Direct SNAP43-TBP contact not yet established","No structure of the cooperative complex"]},{"year":2003,"claim":"Identified a direct SNAP43-TBP interaction contributing to TBP recruitment, clarifying how SNAPc assembles a Pol III preinitiation complex on the U6 TATA box.","evidence":"TBP recruitment and direct interaction assays with reconstituted mini-SNAPc","pmids":["12621023"],"confidence":"Medium","gaps":["Single-lab finding","Interplay with SNAP45-TBP contact not reconciled"]},{"year":2004,"claim":"Provided a mechanistic basis for polymerase selectivity by showing the SNAP43 ortholog adopts distinct conformations on U1 versus U6 PSEs.","evidence":"Photo-cross-linking of Drosophila DmPBP45 on U1/U6 PSEs in S2 cells","pmids":["14966271"],"confidence":"Medium","gaps":["Demonstrated in ortholog, not human","Conformation-to-polymerase link inferred, not directly shown"]},{"year":2006,"claim":"Confirmed SNAP43 participates in direct DNA contacts and that an E. coli-expressed partial SNAPc recapitulates PSE binding, TBP recruitment and snRNA transcription.","evidence":"E. coli co-expression of partial SNAPc, PSE binding, TBP recruitment and reconstituted transcription","pmids":["16603380"],"confidence":"Medium","gaps":["Single-lab reconstitution","Precise SNAP43 DNA contact residues not defined"]},{"year":2012,"claim":"Expanded SNAPC1 function beyond snRNA genes by showing genome-wide occupancy at active protein-coding genes coupled to elongating Pol II and required for stimulus-responsive transcription.","evidence":"ChIP-seq, siRNA/shRNA depletion with EGF/RA responsiveness assays and elongation-inhibitor treatment","pmids":["22966203"],"confidence":"High","gaps":["Whether coactivator role uses the full SNAPc complex unclear","Direct partners at protein-coding genes unidentified"]},{"year":2022,"claim":"Resolved the atomic basis of PSE recognition, visualizing mini-SNAPc in a wrap-around mode on the U6 PSE with SNAP43 directly in the assembly.","evidence":"Cryo-EM of human mini-SNAPc on U6-1 PSE at 3.49 Å","pmids":["36369505"],"confidence":"High","gaps":["Full five-subunit complex not resolved","No structure with TBP or polymerase bound"]},{"year":2025,"claim":"Established SUMOylation of SNAPC1 as a regulatory layer required for SNAPC4 interaction, complex assembly and sustained snRNA transcription.","evidence":"dCas9-SENP1 targeted deSUMOylation, K245R/K333R mutagenesis, degron depletion, co-IP and ChIP with snRNA readout","pmids":["40956881"],"confidence":"High","gaps":["SUMO E3 ligase responsible unidentified","Whether SUMOylation regulates protein-coding coactivator role unknown","Structural consequence of SUMOylation on SNAPC4 binding unresolved"]},{"year":null,"claim":"How SNAPc conformation and PSE geometry select between RNA polymerase II and III in human cells, and how SNAPC1's coactivator role at protein-coding genes is integrated with its snRNA function, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No human structure capturing polymerase-specific recruitment","Mechanism connecting elongation-coupled occupancy to coactivation undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[9,11]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,10]},{"term_id":"GO:0140223","term_label":"general transcription initiation factor activity","supporting_discovery_ids":[0,3]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,10]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,3,10]}],"complexes":["SNAPc/PTF"],"partners":["SNAP50","SNAP190","TBP","SNAPC4","SNAPC3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q16533","full_name":"snRNA-activating protein complex subunit 1","aliases":["Proximal sequence element-binding transcription factor subunit gamma","PSE-binding factor subunit gamma","PTF subunit gamma","Small nuclear RNA-activating complex polypeptide 1","snRNA-activating protein complex 43 kDa subunit","SNAPc 43 kDa subunit"],"length_aa":368,"mass_kda":43.0,"function":"Part of the SNAPc complex required for the transcription of both RNA polymerase II and III small-nuclear RNA genes. Binds to the proximal sequence element (PSE), a non-TATA-box basal promoter element common to these 2 types of genes. Recruits TBP and BRF2 to the U6 snRNA TATA box","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q16533/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/SNAPC1","classification":"Common Essential","n_dependent_lines":1205,"n_total_lines":1208,"dependency_fraction":0.9975165562913907},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/SNAPC1","total_profiled":1310},"omim":[{"mim_id":"605979","title":"SMALL NUCLEAR RNA-ACTIVATING PROTEIN COMPLEX, POLYPEPTIDE 5; SNAPC5","url":"https://www.omim.org/entry/605979"},{"mim_id":"605076","title":"SMALL NUCLEAR RNA-ACTIVATING PROTEIN COMPLEX, POLYPEPTIDE 2; SNAPC2","url":"https://www.omim.org/entry/605076"},{"mim_id":"602777","title":"SMALL NUCLEAR RNA-ACTIVATING PROTEIN COMPLEX, POLYPEPTIDE 4; SNAPC4","url":"https://www.omim.org/entry/602777"},{"mim_id":"602348","title":"SMALL NUCLEAR RNA-ACTIVATING PROTEIN COMPLEX, POLYPEPTIDE 3; SNAPC3","url":"https://www.omim.org/entry/602348"},{"mim_id":"600591","title":"SMALL NUCLEAR RNA-ACTIVATING PROTEIN COMPLEX, POLYPEPTIDE 1; SNAPC1","url":"https://www.omim.org/entry/600591"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoli","reliability":"Enhanced"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/SNAPC1"},"hgnc":{"alias_symbol":["SNAP43","PTFgamma"],"prev_symbol":[]},"alphafold":{"accession":"Q16533","domains":[{"cath_id":"-","chopping":"6-162","consensus_level":"high","plddt":89.7238,"start":6,"end":162},{"cath_id":"-","chopping":"166-232","consensus_level":"medium","plddt":80.4357,"start":166,"end":232}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q16533","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q16533-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q16533-F1-predicted_aligned_error_v6.png","plddt_mean":71.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SNAPC1","jax_strain_url":"https://www.jax.org/strain/search?query=SNAPC1"},"sequence":{"accession":"Q16533","fasta_url":"https://rest.uniprot.org/uniprotkb/Q16533.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q16533/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q16533"}},"corpus_meta":[{"pmid":"17079134","id":"PMC_17079134","title":"Identification of differentially expressed genes in HPV-positive and HPV-negative oropharyngeal squamous cell carcinomas.","date":"2006","source":"European journal of cancer (Oxford, England : 1990)","url":"https://pubmed.ncbi.nlm.nih.gov/17079134","citation_count":151,"is_preprint":false},{"pmid":"7715707","id":"PMC_7715707","title":"A TBP-TAF complex required for transcription of human snRNA genes by RNA polymerase II and III.","date":"1995","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/7715707","citation_count":128,"is_preprint":false},{"pmid":"9418884","id":"PMC_9418884","title":"The large subunit of basal transcription factor SNAPc is a Myb domain protein that interacts with Oct-1.","date":"1998","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/9418884","citation_count":82,"is_preprint":false},{"pmid":"9732265","id":"PMC_9732265","title":"SNAP19 mediates the assembly of a functional core promoter complex (SNAPc) shared by RNA polymerases II and 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Health sciences","url":"https://pubmed.ncbi.nlm.nih.gov/37042131","citation_count":2,"is_preprint":false},{"pmid":"40956881","id":"PMC_40956881","title":"SUMO conjugation to promoter-proximal sequence elements-associated proteins impacts on snRNA transcription.","date":"2025","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/40956881","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":13911,"output_tokens":3275,"usd":0.045429,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10746,"output_tokens":3259,"usd":0.067602,"stage2_stop_reason":"end_turn"},"total_usd":0.113031,"stage1_batch_id":"msgbatch_013LWZZT6MWaqB9qyTSeQBmU","stage2_batch_id":"msgbatch_0194ZzQaTGNpruoNJBbEMbt3","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1995,\n      \"finding\": \"SNAPC1 (SNAP43) was identified as a subunit of the SNAPc (also called PTF) complex, which is a TBP-TAF complex required for transcription of both RNA polymerase II and III snRNA genes. SNAPc binds specifically to the proximal sequence element (PSE), a non-TATA-box basal promoter element common to both gene types.\",\n      \"method\": \"Biochemical purification, TBP-TAF complex characterization, PSE-binding assay, in vitro transcription\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — biochemical reconstitution and in vitro transcription assays, foundational paper replicated by multiple subsequent studies\",\n      \"pmids\": [\"7715707\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"SNAPC1 (SNAP43) is required for both RNA polymerase II and III transcription of snRNA genes in vitro. SNAP43 interacts with SNAP50 by co-immunoprecipitation but does not interact with SNAP45 or TBP.\",\n      \"method\": \"Antibody depletion of SNAPc from nuclear extracts, in vitro transcription, co-immunoprecipitation\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro transcription with antibody depletion plus co-IP, replicated by later reconstitution studies\",\n      \"pmids\": [\"9003788\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"SNAP45 interacts with TBP and is required for both RNA polymerase II and III snRNA gene transcription; this established that SNAPC1 (SNAP43) resides in a complex that also contains TBP-interacting subunit SNAP45.\",\n      \"method\": \"Co-immunoprecipitation, electrophoretic mobility shift assay with antibody supershift, in vitro transcription\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — SNAP45 function defined with EMSA and transcription assay; SNAPC1/SNAP43 position in complex confirmed contextually, single lab\",\n      \"pmids\": [\"8633057\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Recombinant SNAPc was reconstituted from five subunits (SNAP43, SNAP45, SNAP50, SNAP190, and the newly identified SNAP19), confirming that this defined complex binds specifically to the PSE and directs both RNA polymerase II and III snRNA gene transcription.\",\n      \"method\": \"Recombinant protein reconstitution, PSE binding assay, in vitro transcription\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — full reconstitution from defined recombinant subunits with functional validation in transcription assay\",\n      \"pmids\": [\"9732265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The genomic structure of the human PTFgamma/SNAP43 gene was determined: it spans ~29 kb, contains 9 exons and 8 introns, and maps to chromosome 14q22 by FISH. The gene lacks a TATA box but has Sp1, Oct1, NF1, AP1, E2F, and USF binding sites in its promoter, and has a VNTR in its 5'-UTR.\",\n      \"method\": \"Genomic cloning, primer extension, fluorescence in situ hybridization (FISH)\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct genomic characterization and chromosomal localization by FISH, single lab\",\n      \"pmids\": [\"9644240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"A detailed map of subunit-subunit contacts within SNAPc was defined: SNAPC1 (SNAP43) contacts were mapped to specific domains, and complexes retaining only the interaction domains bound specifically to the PSE, establishing the minimal architecture for PSE recognition.\",\n      \"method\": \"Co-immunoprecipitation, deletion mapping, PSE binding assay (EMSA)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic deletion analysis with functional PSE-binding readout, single lab\",\n      \"pmids\": [\"11056176\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"A mini-SNAPc composed of SNAP43, SNAP50, and the N-terminal third of SNAP190 binds cooperatively with TBP to the core U6 promoter. A 50-amino-acid region within SNAP190 is required for cooperative binding with TBP in the context of mini-SNAPc. Derivatives of mini-SNAPc lacking this region are still transcriptionally active.\",\n      \"method\": \"Recombinant protein reconstitution, PSE/TATA promoter binding assay, in vitro transcription\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution with defined recombinant subunits including SNAP43, in vitro transcription and binding assays, multiple mutants tested\",\n      \"pmids\": [\"12391172\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"SNAPC1 (SNAP43) directly interacts with the TBP DNA binding domain, contributing to TBP recruitment to the U6 TATA box. This interaction, along with that of SNAP190, helps assemble a RNA polymerase III-specific preinitiation complex.\",\n      \"method\": \"TBP recruitment assay, direct protein-protein interaction assay, reconstituted mini-SNAPc (SNAP43 + SNAP50 + truncated SNAP190)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct interaction demonstrated with reconstituted components, single lab, functional TBP recruitment readout\",\n      \"pmids\": [\"12621023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The Drosophila ortholog of SNAPC1 (SNAP43), DmPBP45, shows conformationally distinct DNA cross-linking patterns when bound to U1 versus U6 PSEs — cross-linking strongly for two helical turns downstream of U1 PSE but only half a turn downstream of U6 PSE. This conformational difference is consistent with a model where PBP conformation determines which RNA polymerase is recruited.\",\n      \"method\": \"Photo-cross-linking, S2 cell expression, functional PSE-binding assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — photo-cross-linking with functional PSE-binding assay in Drosophila ortholog, single lab\",\n      \"pmids\": [\"14966271\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"SNAP43 participates in direct DNA contacts during PSE recognition by SNAPc. A partial recombinant SNAPc containing SNAP190 (1-505), SNAP50, SNAP43, and SNAP19 expressed in E. coli binds DNA specifically, recruits TBP to U6 promoter DNA, and supports transcription of human U1 and U6 snRNA genes by RNA polymerases II and III.\",\n      \"method\": \"E. coli co-expression system, PSE DNA binding assay, TBP recruitment assay, reconstituted in vitro transcription\",\n      \"journal\": \"Protein expression and purification\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — functional reconstitution in E. coli with in vitro transcription, single lab, recapitulates prior baculovirus results\",\n      \"pmids\": [\"16603380\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SNAPC1 occupies not only snRNA gene loci but also a large number of transcriptionally active protein-coding genes genome-wide, mirroring elongating RNA polymerase II across gene bodies and 3' ends. Inhibition of transcriptional elongation causes loss of SNAPC1 from gene 3' ends. Depletion of SNAPC1 diminishes transcriptional responsiveness of many genes to EGF and retinoic acid stimulation, establishing SNAPC1 as a general transcriptional coactivator functioning through elongating RNAPII.\",\n      \"method\": \"ChIP-seq with anti-SNAPC1 antibodies, SNAPC1 knockdown (siRNA/shRNA), RT-qPCR/RNA-seq for EGF and RA responsiveness, transcriptional elongation inhibitor treatment\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP-seq genome-wide occupancy combined with functional knockdown and multiple stimuli, multiple orthogonal methods in single study\",\n      \"pmids\": [\"22966203\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cryo-EM structure of human mini-SNAPc (SNAP190 N-terminal domain, SNAP50, SNAP43) in complex with the human U6-1 PSE was determined at 3.49 Å resolution. The structure reveals how the three subunits assemble into a stable mini-SNAPc in a 'wrap-around' mode on the PSE, with three important motifs of SNAP50 mediating both major groove and minor groove recognition of PSE in coordination with the Myb domain of SNAP190.\",\n      \"method\": \"Cryo-electron microscopy structure determination, structural analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure at 3.49 Å with SNAPC1/SNAP43 directly visualized in complex, high-resolution mechanistic insight\",\n      \"pmids\": [\"36369505\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SNAPC1 is SUMOylated at lysine residues K245 and K333. A SUMOylation-deficient SNAPC1 mutant (2KR) is unable to sustain basal levels of snRNA transcription. While SNAPC1 2KR can still interact with SNAPC3 and is recruited to the PSE, its interaction with SNAPC4 is impaired, indicating that SUMOylation of SNAPC1 is required for proper SNAPc complex assembly and snRNA transcription.\",\n      \"method\": \"CRISPR/dCas9-SENP1 targeted deSUMOylation, site-directed mutagenesis (K245R/K333R), inducible degron depletion system, co-immunoprecipitation (endogenous-tagged SNAPC3 and SNAPC4), ChIP for PSE recruitment, snRNA expression assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods including targeted SUMO protease, mutagenesis, degron depletion, and co-IP, functional transcription readout\",\n      \"pmids\": [\"40956881\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SNAPC1 (SNAP43) is a core subunit of the SNAPc/PTF complex that binds the PSE promoter element to initiate transcription of snRNA genes by both RNA polymerases II and III; cryo-EM structures show it participates in a 'wrap-around' PSE-binding mode with SNAP50 and SNAP190, it directly contacts TBP to facilitate preinitiation complex assembly, its SUMOylation at K245/K333 is required for interaction with SNAPC4 and for sustained snRNA transcription, and beyond snRNA genes it associates with elongating RNAPII at protein-coding genes to function as a general transcriptional coactivator required for stimulus-responsive gene expression.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SNAPC1 (SNAP43) is a core subunit of the SNAPc (PTF) complex, a TBP-containing assembly that binds the proximal sequence element (PSE) to direct transcription of snRNA genes by both RNA polymerase II and III [#0, #3]. Within SNAPc, SNAP43 contacts SNAP50 and the N-terminal region of SNAP190 to form a minimal PSE-binding module, and cryo-EM of this mini-SNAPc on the U6 PSE reveals a 'wrap-around' DNA recognition mode in which SNAP50 motifs and the SNAP190 Myb domain engage both grooves of the element [#1, #6, #11]. SNAP43 also directly contacts the TBP DNA-binding domain, contributing to TBP recruitment and assembly of an RNA polymerase III-specific preinitiation complex on the U6 promoter [#7]. SUMOylation of SNAPC1 at K245 and K333 is required for its interaction with SNAPC4 and for sustained basal snRNA transcription, linking a post-translational modification to proper complex assembly [#12]. Beyond snRNA genes, SNAPC1 occupies transcriptionally active protein-coding loci genome-wide, tracking with elongating RNA polymerase II across gene bodies and 3' ends, and its depletion blunts transcriptional responses to EGF and retinoic acid, establishing a broader role as a general transcriptional coactivator [#10].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established SNAP43 as a subunit of a PSE-binding TBP-TAF complex required for snRNA gene transcription by both Pol II and Pol III, defining the foundational machinery.\",\n      \"evidence\": \"Biochemical purification of SNAPc/PTF, PSE-binding and in vitro transcription assays\",\n      \"pmids\": [\"7715707\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Individual subunit contributions not yet resolved\", \"No structural detail of PSE recognition\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Defined the immediate protein neighborhood of SNAP43 within SNAPc and confirmed its functional requirement, showing it binds SNAP50 but not SNAP45 or TBP directly.\",\n      \"evidence\": \"Antibody depletion plus in vitro transcription and co-immunoprecipitation; companion work placing SNAP45 as the TBP-contacting subunit\",\n      \"pmids\": [\"9003788\", \"8633057\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not map contact domains\", \"Subunit stoichiometry undefined\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstrated that a defined five-subunit recombinant SNAPc is sufficient for specific PSE binding and snRNA transcription, proving the complete subunit roster.\",\n      \"evidence\": \"Recombinant reconstitution from SNAP43/45/50/190/19 with PSE binding and in vitro transcription\",\n      \"pmids\": [\"9732265\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural model\", \"Mechanism distinguishing Pol II vs Pol III recruitment unresolved\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Mapped the minimal subunit-subunit contact architecture, showing interaction domains alone reconstitute PSE-specific binding.\",\n      \"evidence\": \"Deletion mapping with co-IP and EMSA PSE-binding readout\",\n      \"pmids\": [\"11056176\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab mapping\", \"Atomic detail of contacts unknown\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Showed that a mini-SNAPc (SNAP43, SNAP50, SNAP190 N-terminus) binds the U6 promoter cooperatively with TBP, identifying the minimal transcriptionally competent module.\",\n      \"evidence\": \"Recombinant mini-SNAPc reconstitution, PSE/TATA binding and in vitro transcription\",\n      \"pmids\": [\"12391172\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct SNAP43-TBP contact not yet established\", \"No structure of the cooperative complex\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identified a direct SNAP43-TBP interaction contributing to TBP recruitment, clarifying how SNAPc assembles a Pol III preinitiation complex on the U6 TATA box.\",\n      \"evidence\": \"TBP recruitment and direct interaction assays with reconstituted mini-SNAPc\",\n      \"pmids\": [\"12621023\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab finding\", \"Interplay with SNAP45-TBP contact not reconciled\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Provided a mechanistic basis for polymerase selectivity by showing the SNAP43 ortholog adopts distinct conformations on U1 versus U6 PSEs.\",\n      \"evidence\": \"Photo-cross-linking of Drosophila DmPBP45 on U1/U6 PSEs in S2 cells\",\n      \"pmids\": [\"14966271\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Demonstrated in ortholog, not human\", \"Conformation-to-polymerase link inferred, not directly shown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Confirmed SNAP43 participates in direct DNA contacts and that an E. coli-expressed partial SNAPc recapitulates PSE binding, TBP recruitment and snRNA transcription.\",\n      \"evidence\": \"E. coli co-expression of partial SNAPc, PSE binding, TBP recruitment and reconstituted transcription\",\n      \"pmids\": [\"16603380\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab reconstitution\", \"Precise SNAP43 DNA contact residues not defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Expanded SNAPC1 function beyond snRNA genes by showing genome-wide occupancy at active protein-coding genes coupled to elongating Pol II and required for stimulus-responsive transcription.\",\n      \"evidence\": \"ChIP-seq, siRNA/shRNA depletion with EGF/RA responsiveness assays and elongation-inhibitor treatment\",\n      \"pmids\": [\"22966203\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether coactivator role uses the full SNAPc complex unclear\", \"Direct partners at protein-coding genes unidentified\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Resolved the atomic basis of PSE recognition, visualizing mini-SNAPc in a wrap-around mode on the U6 PSE with SNAP43 directly in the assembly.\",\n      \"evidence\": \"Cryo-EM of human mini-SNAPc on U6-1 PSE at 3.49 Å\",\n      \"pmids\": [\"36369505\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full five-subunit complex not resolved\", \"No structure with TBP or polymerase bound\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established SUMOylation of SNAPC1 as a regulatory layer required for SNAPC4 interaction, complex assembly and sustained snRNA transcription.\",\n      \"evidence\": \"dCas9-SENP1 targeted deSUMOylation, K245R/K333R mutagenesis, degron depletion, co-IP and ChIP with snRNA readout\",\n      \"pmids\": [\"40956881\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"SUMO E3 ligase responsible unidentified\", \"Whether SUMOylation regulates protein-coding coactivator role unknown\", \"Structural consequence of SUMOylation on SNAPC4 binding unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How SNAPc conformation and PSE geometry select between RNA polymerase II and III in human cells, and how SNAPC1's coactivator role at protein-coding genes is integrated with its snRNA function, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No human structure capturing polymerase-specific recruitment\", \"Mechanism connecting elongation-coupled occupancy to coactivation undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [9, 11]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 10]},\n      {\"term_id\": \"GO:0140223\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 3, 10]}\n    ],\n    \"complexes\": [\"SNAPc/PTF\"],\n    \"partners\": [\"SNAP50\", \"SNAP190\", \"TBP\", \"SNAPC4\", \"SNAPC3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}