{"gene":"BDP1","run_date":"2026-06-09T22:02:44","timeline":{"discoveries":[{"year":1995,"finding":"TFC5/B'' (yeast ortholog of BDP1) encodes the B'' component of S. cerevisiae TFIIIB; recombinant B'' reconstitutes fully functional TFIIIB (with Brf1 and TBP) capable of TFIIIC-directed and TATA box-dependent DNA binding and transcription. A truncated form lacking 39 N-terminal and 107 C-terminal amino acids remains functional.","method":"Recombinant protein reconstitution, in vitro transcription, DNase I footprinting","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — full in vitro reconstitution with recombinant components, functional transcription assay, and footprinting; foundational reconstitution paper","pmids":["7568218"],"is_preprint":false},{"year":2002,"finding":"Three segments of yeast Bdp1 are essential for viability; suppression of bdp1 conditional alleles by SPT15 (TBP) or BRF1 overexpression identifies functional interactions of specific Bdp1 segments with TBP and Brf1, respectively. Physical interaction of RNase P with Bdp1 was demonstrated by co-immunoprecipitation and pull-down assays. A specific internal deletion (aa 253–269) impairs RPR1 transcription and tRNA processing.","method":"Deletion analysis, genetic suppression, co-immunoprecipitation, pull-down assay, in vitro transcription","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (genetics, biochemical interaction, in vitro transcription); replicated across multiple constructs in same study","pmids":["11971960"],"is_preprint":false},{"year":2003,"finding":"The TFIIIC subunit Tfc4 recruits both Brf1 and Bdp1 to assemble TFIIIB onto DNA; Bdp1 binding maps to the TPRs1-9 region of Tfc4 (overlapping the two Brf1 binding arrays). The L469K mutation in Tfc4 TPR7 impairs both Brf1 and Bdp1 incorporation into TFIIIB-TFIIIC-DNA complexes.","method":"Mutagenesis, biochemical binding assays, reporter gene transcription","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding assays plus functional transcription data, single lab","pmids":["12930823"],"is_preprint":false},{"year":2003,"finding":"A specific internal deletion of Bdp1 (aa 253–269) selectively impairs TFIIIC-dependent assembly of TFIIIB on the RPR1 promoter, leading to gene-specific defective single-round and multiple-round transcription in vitro.","method":"In vitro transcription, TFIIIB assembly assay","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro reconstitution assay, single lab, single gene-specific phenotype","pmids":["12885403"],"is_preprint":false},{"year":2004,"finding":"CK2 phosphorylates the Bdp1 component of human Brf2-TFIIIB during mitosis, causing Bdp1 dissociation from the U6 promoter and from chromatin generally, resulting in repression of Pol III transcription. CK2-mediated phosphorylation of Bdp1 is the mechanism of cell cycle-specific Pol III repression.","method":"In vitro kinase assay, chromatin immunoprecipitation, mitotic extract transcription assay, CK2 inhibition","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — direct phosphorylation assay, ChIP showing promoter dissociation, functional rescue with kinase inhibitor; multiple orthogonal methods in single study","pmids":["15469824"],"is_preprint":false},{"year":2006,"finding":"The principal Brf1-Bdp1 interaction site was mapped: a 66-amino acid segment of Brf1 (C-terminal half) anchors Bdp1, and the interacting Bdp1 domain is a 66-amino acid segment that includes the SANT domain, which is the most phylogenetically conserved region of Bdp1.","method":"Site-directed mutagenesis, photochemical protein-DNA cross-linking, deletion analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — structure-informed mutagenesis combined with photochemical cross-linking, extensive deletion series","pmids":["16551611"],"is_preprint":false},{"year":2006,"finding":"Brf1 and Bdp1 together impose a strict sequence preference for the downstream half of the TATA box (selecting TGTAAATA), matching the TATA box of the Pol III-transcribed U6 snRNA gene, suggesting that Bdp1 entry into the TFIIIB-DNA complex alters TBP-DNA interactions.","method":"In vitro selection (SELEX) with altered-specificity TBP mutant, transcription assays","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro selection assay, single lab, single study","pmids":["17028095"],"is_preprint":false},{"year":2006,"finding":"The zinc finger protein ZNF297B interacts with human BDP1; the interaction was confirmed by co-immunoprecipitation and mapped to the BTB/POZ domain-containing N-terminal region of ZNF297B (aa 1–127) and the N-terminal end of BDP1 (aa 1–299).","method":"Yeast two-hybrid, co-immunoprecipitation","journal":"Biological chemistry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — yeast two-hybrid confirmed by single co-IP, single lab, no functional follow-up on human BDP1","pmids":["16542149"],"is_preprint":false},{"year":2008,"finding":"NMR mapping of the Brf1-Bdp1 interaction interface reveals that the principal anchorage site of Brf1 on Bdp1 is located on a convex surface encompassing helix 1 and helix 3 of the SANT domain of Bdp1; the main Bdp1-binding site on Brf1 is a segment of residues 470–495.","method":"NMR spectroscopy, structural modeling","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — NMR structural mapping with single-residue resolution, but single study, no mutagenesis validation reported in abstract","pmids":["19086269"],"is_preprint":false},{"year":2011,"finding":"The C-terminal domain of yeast Rpc37 (within the TFIIF-like Rpc37/53 dimer of Pol III) contains binding sites for Bdp1; this positions Rpc37/53 as a hub connecting TFIIIC, Bdp1, and the Pol III active center within the preinitiation complex.","method":"BPA photo-cross-linking, site-directed hydroxyl radical probing","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal in vivo cross-linking methods mapping Bdp1 contacts, single lab","pmids":["21536656"],"is_preprint":false},{"year":2015,"finding":"An essential N-terminal region of yeast Bdp1 cross-links to the Pol III catalytic subunit C128 (N-terminal region) and to the N-terminal half of Brf1 and the C-terminal domain of the Rpc37 (C37) subunit, positioning this Bdp1 region within the active site cleft of Pol III; this region is necessary for transcription initiation.","method":"BPA photo-cross-linking with photoreactive amino acids, functional mutagenesis","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — photo-cross-linking with functional data, single lab, two methods","pmids":["26055328"],"is_preprint":false},{"year":2017,"finding":"Crystal structure (2.7 Å) of the human Brf2-TBP-Bdp1 complex bound to DNA reveals the structural basis of Bdp1 assembly into TFIIIB; Bdp1 shows structural and functional similarities to Pol II factors TFIIA and TFIIF. Single-molecule FRET and in vitro assays support a concerted mechanism involving Bdp1 and Pol III subunits for the closed-to-open pre-initiation complex transition. Bdp1 interacts with the upstream factor SNAPc.","method":"X-ray crystallography (2.7 Å), single-molecule FRET, in vitro biochemical assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus single-molecule FRET plus biochemical assays in one study, multiple orthogonal methods","pmids":["28743884"],"is_preprint":false},{"year":2018,"finding":"In Drosophila, DmSNAPc bound to a U6 PSE (but not a U1 PSE) directly recruits Bdp1 to the U6 promoter; an 87-residue region of Bdp1 was identified as responsible for this interaction, consistent with SNAPc adopting distinct conformations on U6 vs. U1 PSEs.","method":"In vitro binding assays, promoter specificity assays, deletion mapping","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct binding assays with deletion mapping, single lab, ortholog (Drosophila)","pmids":["29932462"],"is_preprint":false},{"year":2020,"finding":"In Drosophila, DmSNAPc-Bdp1 can recruit TBP to the U6 promoter; a region of Bdp1 sufficient for TBP recruitment was identified, and this same region cross-links to nucleotides within the U6 PSE. Cross-linking mass spectrometry revealed specific DmSNAPc subunit interactions with Bdp1 and TBP.","method":"Cross-linking mass spectrometry, UV cross-linking assays, deletion analysis","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cross-linking MS plus functional binding assays, single lab, ortholog (Drosophila)","pmids":["32253345"],"is_preprint":false}],"current_model":"BDP1 (human/mammalian) is the third subunit of the Pol III transcription initiation factor TFIIIB, working alongside TBP and Brf1/Brf2; it is recruited to promoters via TFIIIC (through overlapping Tfc4/TPR interactions shared with Brf1) and via SNAPc at U6 snRNA promoters, assembles into TFIIIB through its SANT domain contacting a defined surface on Brf1, positions an essential N-terminal region within the Pol III active-site cleft to drive closed-to-open pre-initiation complex transition, and is cell-cycle regulated by CK2 phosphorylation during mitosis, which causes its dissociation from chromatin and consequent repression of Pol III transcription."},"narrative":{"mechanistic_narrative":"BDP1 is the third subunit of the RNA polymerase III general transcription initiation factor TFIIIB, where it assembles with TBP and a Brf-family subunit (Brf1/Brf2) to form the complex that directs Pol III preinitiation [PMID:7568218, PMID:28743884]. In yeast, recombinant B''/Bdp1 reconstitutes fully functional TFIIIB capable of TFIIIC-directed, TATA-dependent DNA binding and transcription, and discrete internal segments mediate functional interactions with TBP and Brf1 [PMID:7568218, PMID:11971960]. BDP1 is recruited to promoters by the TFIIIC subunit Tfc4 through its TPR array, overlapping the Brf1-binding region [PMID:12930823], and at U6 snRNA promoters it is recruited by SNAPc bound to the U6 PSE [PMID:28743884, PMID:29932462], where the SNAPc–Bdp1 module can in turn recruit TBP [PMID:32253345]. Assembly into TFIIIB is driven by its phylogenetically conserved SANT domain, whose helices 1 and 3 form a convex surface that anchors a defined segment (residues ~470–495) of Brf1 [PMID:16551611, PMID:19086269]; Bdp1 entry alters TBP–DNA contacts to impose sequence preference on the downstream TATA box [PMID:17028095]. Within the preinitiation complex an essential N-terminal region of Bdp1 is positioned in the Pol III active-site cleft through cross-links to the catalytic subunit C128 and to the Rpc37/53 dimer, and this region is required to drive the closed-to-open transition during initiation [PMID:21536656, PMID:26055328, PMID:28743884]. BDP1 is cell-cycle regulated: CK2 phosphorylates it during mitosis, causing dissociation from the U6 promoter and chromatin and repressing Pol III transcription [PMID:15469824]. Beyond Pol III initiation, yeast Bdp1 physically interacts with RNase P, and a specific internal deletion impairs RPR1 transcription and tRNA processing [PMID:11971960].","teleology":[{"year":1995,"claim":"Established that BDP1's yeast ortholog is a bona fide structural subunit of TFIIIB rather than an accessory factor, by showing it is required to reconstitute a transcription-competent complex.","evidence":"Recombinant reconstitution of TFIIIB with B''/Brf1/TBP, in vitro transcription and DNase I footprinting in S. cerevisiae","pmids":["7568218"],"confidence":"High","gaps":["Did not resolve which domains contact TBP vs Brf1","No structural information on the assembled complex","Truncatable termini left functional roles of N/C ends undefined"]},{"year":2002,"claim":"Mapped which Bdp1 segments engage TBP and Brf1 and revealed an unexpected physical link to RNase P, broadening its role beyond Pol III initiation to RNA processing.","evidence":"Deletion analysis, genetic suppression by SPT15/BRF1, co-IP and pull-down, in vitro transcription in yeast","pmids":["11971960"],"confidence":"High","gaps":["Functional consequence of the RNase P interaction in vivo not defined","Structural basis of TBP/Brf1 contacts not resolved"]},{"year":2003,"claim":"Defined how BDP1 is recruited to chromatin by identifying the TFIIIC subunit Tfc4 surface that delivers both Brf1 and Bdp1 onto promoter DNA.","evidence":"Mutagenesis (Tfc4 L469K), biochemical binding assays, reporter transcription; plus internal Bdp1 deletion (aa253–269) in vitro assembly assays","pmids":["12930823","12885403"],"confidence":"Medium","gaps":["Recruitment shown for yeast TFIIIC; mammalian equivalent not addressed here","Order of Brf1 vs Bdp1 loading not fully resolved"]},{"year":2004,"claim":"Explained cell-cycle control of Pol III transcription by showing CK2 phosphorylation of human Bdp1 during mitosis drives its dissociation from chromatin.","evidence":"In vitro kinase assay, ChIP at U6 promoter, mitotic extract transcription with CK2 inhibitor rescue in human cells","pmids":["15469824"],"confidence":"High","gaps":["Phosphosite identity and structural impact not defined","Whether the same applies to Brf1-TFIIIB at all gene classes not tested"]},{"year":2006,"claim":"Localized the principal Brf1–Bdp1 anchoring interaction to the conserved SANT domain and showed Bdp1 incorporation reshapes TBP–DNA sequence recognition.","evidence":"Site-directed mutagenesis, photochemical protein-DNA cross-linking, SELEX with altered-specificity TBP in vitro","pmids":["16551611","17028095"],"confidence":"High","gaps":["Atomic interface not yet resolved at this stage","Generality of TATA preference shift across Pol III gene classes unclear"]},{"year":2008,"claim":"Resolved the Brf1–Bdp1 interface at residue level, defining the SANT helix1/helix3 convex surface as the docking site.","evidence":"NMR spectroscopy and structural modeling of the Brf1–Bdp1 interaction","pmids":["19086269"],"confidence":"Medium","gaps":["Mutagenesis validation of mapped residues not reported","Single study, in isolation from full TFIIIB context"]},{"year":2015,"claim":"Positioned an essential N-terminal region of Bdp1 inside the Pol III active-site cleft, linking it directly to the catalytic machinery and the Rpc37/53 hub.","evidence":"BPA photo-cross-linking and functional mutagenesis mapping Bdp1 contacts to C128, Brf1 and Rpc37 in yeast; earlier Rpc37 hub mapping","pmids":["26055328","21536656"],"confidence":"Medium","gaps":["Cross-linking does not give an atomic structure of the cleft-bound state","Mechanistic step driven by this region not yet defined"]},{"year":2017,"claim":"Provided the structural basis for Bdp1 assembly into TFIIIB and a mechanism for its role in initiation, showing similarity to Pol II factors TFIIA/TFIIF and a concerted closed-to-open transition.","evidence":"2.7 Å crystal structure of human Brf2-TBP-Bdp1-DNA, single-molecule FRET, in vitro assays; Bdp1–SNAPc interaction","pmids":["28743884"],"confidence":"High","gaps":["Structure is of Brf2-TFIIIB; full open-complex with Pol III not captured","Dynamics of SNAPc handoff not structurally resolved"]},{"year":2020,"claim":"Defined the SNAPc-dependent recruitment pathway at U6 promoters, showing Bdp1 is recruited by promoter-bound SNAPc in a PSE-specific manner and can in turn recruit TBP.","evidence":"In vitro binding, promoter-specificity and deletion mapping; cross-linking mass spectrometry and UV cross-linking in Drosophila","pmids":["29932462","32253345"],"confidence":"Medium","gaps":["Mapped in Drosophila; human SNAPc–Bdp1 geometry not directly shown","Conformational basis of U6 vs U1 PSE discrimination inferred, not solved"]},{"year":null,"claim":"How CK2 phosphorylation, the active-site-cleft N-terminal region, and SNAPc/TFIIIC recruitment are integrated into a single dynamic cycle of Pol III initiation and cell-cycle regulation remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure of a complete Bdp1-containing open Pol III preinitiation complex","Functional role of the human BDP1–ZNF297B and Bdp1–RNase P interactions undefined","Phosphosite-level mechanism of mitotic dissociation not mapped onto structure"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,11]},{"term_id":"GO:0140223","term_label":"general transcription initiation factor activity","supporting_discovery_ids":[0,11]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[2,13]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,6]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[4]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,11]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[1,11]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[4]}],"complexes":["TFIIIB"],"partners":["BRF1","BRF2","TBP","TFC4","SNAPC","RPC37","ZNF297B"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"A6H8Y1","full_name":"Transcription factor TFIIIB component B'' homolog","aliases":["Transcription factor IIIB 150","TFIIIB150","Transcription factor-like nuclear regulator"],"length_aa":2624,"mass_kda":293.9,"function":"General activator of RNA polymerase III transcription. Requires for transcription from all three types of polymerase III promoters. Requires for transcription of genes with internal promoter elements and with promoter elements upstream of the initiation site","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/A6H8Y1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/BDP1","classification":"Common 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MARCHF3","url":"https://www.omim.org/entry/613333"},{"mim_id":"607013","title":"BRF2 SUBUNIT OF RNA POLYMERASE III TRANSCRIPTION INITIATION FACTOR; BRF2","url":"https://www.omim.org/entry/607013"},{"mim_id":"607012","title":"B-DOUBLE PRIME 1, SUBUNIT OF RNA POLYMERASE III TRANSCRIPTION INITIATION FACTOR IIIB; BDP1","url":"https://www.omim.org/entry/607012"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/BDP1"},"hgnc":{"alias_symbol":["TFC5","KIAA1241","KIAA1689","HSA238520","TFIIIB150"],"prev_symbol":["TFNR","TAF3B1"]},"alphafold":{"accession":"A6H8Y1","domains":[{"cath_id":"-","chopping":"306-381","consensus_level":"medium","plddt":92.4438,"start":306,"end":381}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/A6H8Y1","model_url":"https://alphafold.ebi.ac.uk/files/AF-A6H8Y1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-A6H8Y1-F1-predicted_aligned_error_v6.png","plddt_mean":36.97},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=BDP1","jax_strain_url":"https://www.jax.org/strain/search?query=BDP1"},"sequence":{"accession":"A6H8Y1","fasta_url":"https://rest.uniprot.org/uniprotkb/A6H8Y1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/A6H8Y1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/A6H8Y1"}},"corpus_meta":[{"pmid":"7568218","id":"PMC_7568218","title":"Cloning, 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and Bdp1 impose a strict sequence preference for the downstream half of the TATA box.","date":"2006","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/17028095","citation_count":3,"is_preprint":false},{"pmid":"12885403","id":"PMC_12885403","title":"A gene-specific effect of an internal deletion in the Bdp1 subunit of the RNA polymerase III transcription initiation factor TFIIIB.","date":"2003","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/12885403","citation_count":3,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.11.26.690747","title":"Molecular and functional dissection of the AP2-I/BDP1 transcriptional complex of the malaria parasite reveals a role beyond the red blood cell stages","date":"2025-11-26","source":"bioRxiv","url":"https://doi.org/10.1101/2025.11.26.690747","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.01.16.633141","title":"A novel inhibitor against the bromodomain  <i>Pf</i>  BDP1 of the malaria pathogen  <i>Plasmodium falciparum</i>","date":"2025-01-16","source":"bioRxiv","url":"https://doi.org/10.1101/2025.01.16.633141","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":12074,"output_tokens":3334,"usd":0.043116,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10775,"output_tokens":3505,"usd":0.07075,"stage2_stop_reason":"end_turn"},"total_usd":0.113866,"stage1_batch_id":"msgbatch_0179Z2pxRYBsXi2xADneafRw","stage2_batch_id":"msgbatch_01LaY9ZaVdgjWArcZo9eqQE5","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1995,\n      \"finding\": \"TFC5/B'' (yeast ortholog of BDP1) encodes the B'' component of S. cerevisiae TFIIIB; recombinant B'' reconstitutes fully functional TFIIIB (with Brf1 and TBP) capable of TFIIIC-directed and TATA box-dependent DNA binding and transcription. A truncated form lacking 39 N-terminal and 107 C-terminal amino acids remains functional.\",\n      \"method\": \"Recombinant protein reconstitution, in vitro transcription, DNase I footprinting\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — full in vitro reconstitution with recombinant components, functional transcription assay, and footprinting; foundational reconstitution paper\",\n      \"pmids\": [\"7568218\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Three segments of yeast Bdp1 are essential for viability; suppression of bdp1 conditional alleles by SPT15 (TBP) or BRF1 overexpression identifies functional interactions of specific Bdp1 segments with TBP and Brf1, respectively. Physical interaction of RNase P with Bdp1 was demonstrated by co-immunoprecipitation and pull-down assays. A specific internal deletion (aa 253–269) impairs RPR1 transcription and tRNA processing.\",\n      \"method\": \"Deletion analysis, genetic suppression, co-immunoprecipitation, pull-down assay, in vitro transcription\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (genetics, biochemical interaction, in vitro transcription); replicated across multiple constructs in same study\",\n      \"pmids\": [\"11971960\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The TFIIIC subunit Tfc4 recruits both Brf1 and Bdp1 to assemble TFIIIB onto DNA; Bdp1 binding maps to the TPRs1-9 region of Tfc4 (overlapping the two Brf1 binding arrays). The L469K mutation in Tfc4 TPR7 impairs both Brf1 and Bdp1 incorporation into TFIIIB-TFIIIC-DNA complexes.\",\n      \"method\": \"Mutagenesis, biochemical binding assays, reporter gene transcription\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding assays plus functional transcription data, single lab\",\n      \"pmids\": [\"12930823\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"A specific internal deletion of Bdp1 (aa 253–269) selectively impairs TFIIIC-dependent assembly of TFIIIB on the RPR1 promoter, leading to gene-specific defective single-round and multiple-round transcription in vitro.\",\n      \"method\": \"In vitro transcription, TFIIIB assembly assay\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro reconstitution assay, single lab, single gene-specific phenotype\",\n      \"pmids\": [\"12885403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"CK2 phosphorylates the Bdp1 component of human Brf2-TFIIIB during mitosis, causing Bdp1 dissociation from the U6 promoter and from chromatin generally, resulting in repression of Pol III transcription. CK2-mediated phosphorylation of Bdp1 is the mechanism of cell cycle-specific Pol III repression.\",\n      \"method\": \"In vitro kinase assay, chromatin immunoprecipitation, mitotic extract transcription assay, CK2 inhibition\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — direct phosphorylation assay, ChIP showing promoter dissociation, functional rescue with kinase inhibitor; multiple orthogonal methods in single study\",\n      \"pmids\": [\"15469824\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The principal Brf1-Bdp1 interaction site was mapped: a 66-amino acid segment of Brf1 (C-terminal half) anchors Bdp1, and the interacting Bdp1 domain is a 66-amino acid segment that includes the SANT domain, which is the most phylogenetically conserved region of Bdp1.\",\n      \"method\": \"Site-directed mutagenesis, photochemical protein-DNA cross-linking, deletion analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — structure-informed mutagenesis combined with photochemical cross-linking, extensive deletion series\",\n      \"pmids\": [\"16551611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Brf1 and Bdp1 together impose a strict sequence preference for the downstream half of the TATA box (selecting TGTAAATA), matching the TATA box of the Pol III-transcribed U6 snRNA gene, suggesting that Bdp1 entry into the TFIIIB-DNA complex alters TBP-DNA interactions.\",\n      \"method\": \"In vitro selection (SELEX) with altered-specificity TBP mutant, transcription assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro selection assay, single lab, single study\",\n      \"pmids\": [\"17028095\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The zinc finger protein ZNF297B interacts with human BDP1; the interaction was confirmed by co-immunoprecipitation and mapped to the BTB/POZ domain-containing N-terminal region of ZNF297B (aa 1–127) and the N-terminal end of BDP1 (aa 1–299).\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation\",\n      \"journal\": \"Biological chemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — yeast two-hybrid confirmed by single co-IP, single lab, no functional follow-up on human BDP1\",\n      \"pmids\": [\"16542149\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"NMR mapping of the Brf1-Bdp1 interaction interface reveals that the principal anchorage site of Brf1 on Bdp1 is located on a convex surface encompassing helix 1 and helix 3 of the SANT domain of Bdp1; the main Bdp1-binding site on Brf1 is a segment of residues 470–495.\",\n      \"method\": \"NMR spectroscopy, structural modeling\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — NMR structural mapping with single-residue resolution, but single study, no mutagenesis validation reported in abstract\",\n      \"pmids\": [\"19086269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The C-terminal domain of yeast Rpc37 (within the TFIIF-like Rpc37/53 dimer of Pol III) contains binding sites for Bdp1; this positions Rpc37/53 as a hub connecting TFIIIC, Bdp1, and the Pol III active center within the preinitiation complex.\",\n      \"method\": \"BPA photo-cross-linking, site-directed hydroxyl radical probing\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal in vivo cross-linking methods mapping Bdp1 contacts, single lab\",\n      \"pmids\": [\"21536656\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"An essential N-terminal region of yeast Bdp1 cross-links to the Pol III catalytic subunit C128 (N-terminal region) and to the N-terminal half of Brf1 and the C-terminal domain of the Rpc37 (C37) subunit, positioning this Bdp1 region within the active site cleft of Pol III; this region is necessary for transcription initiation.\",\n      \"method\": \"BPA photo-cross-linking with photoreactive amino acids, functional mutagenesis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — photo-cross-linking with functional data, single lab, two methods\",\n      \"pmids\": [\"26055328\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Crystal structure (2.7 Å) of the human Brf2-TBP-Bdp1 complex bound to DNA reveals the structural basis of Bdp1 assembly into TFIIIB; Bdp1 shows structural and functional similarities to Pol II factors TFIIA and TFIIF. Single-molecule FRET and in vitro assays support a concerted mechanism involving Bdp1 and Pol III subunits for the closed-to-open pre-initiation complex transition. Bdp1 interacts with the upstream factor SNAPc.\",\n      \"method\": \"X-ray crystallography (2.7 Å), single-molecule FRET, in vitro biochemical assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus single-molecule FRET plus biochemical assays in one study, multiple orthogonal methods\",\n      \"pmids\": [\"28743884\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In Drosophila, DmSNAPc bound to a U6 PSE (but not a U1 PSE) directly recruits Bdp1 to the U6 promoter; an 87-residue region of Bdp1 was identified as responsible for this interaction, consistent with SNAPc adopting distinct conformations on U6 vs. U1 PSEs.\",\n      \"method\": \"In vitro binding assays, promoter specificity assays, deletion mapping\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct binding assays with deletion mapping, single lab, ortholog (Drosophila)\",\n      \"pmids\": [\"29932462\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In Drosophila, DmSNAPc-Bdp1 can recruit TBP to the U6 promoter; a region of Bdp1 sufficient for TBP recruitment was identified, and this same region cross-links to nucleotides within the U6 PSE. Cross-linking mass spectrometry revealed specific DmSNAPc subunit interactions with Bdp1 and TBP.\",\n      \"method\": \"Cross-linking mass spectrometry, UV cross-linking assays, deletion analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cross-linking MS plus functional binding assays, single lab, ortholog (Drosophila)\",\n      \"pmids\": [\"32253345\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"BDP1 (human/mammalian) is the third subunit of the Pol III transcription initiation factor TFIIIB, working alongside TBP and Brf1/Brf2; it is recruited to promoters via TFIIIC (through overlapping Tfc4/TPR interactions shared with Brf1) and via SNAPc at U6 snRNA promoters, assembles into TFIIIB through its SANT domain contacting a defined surface on Brf1, positions an essential N-terminal region within the Pol III active-site cleft to drive closed-to-open pre-initiation complex transition, and is cell-cycle regulated by CK2 phosphorylation during mitosis, which causes its dissociation from chromatin and consequent repression of Pol III transcription.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"BDP1 is the third subunit of the RNA polymerase III general transcription initiation factor TFIIIB, where it assembles with TBP and a Brf-family subunit (Brf1/Brf2) to form the complex that directs Pol III preinitiation [#0, #11]. In yeast, recombinant B''/Bdp1 reconstitutes fully functional TFIIIB capable of TFIIIC-directed, TATA-dependent DNA binding and transcription, and discrete internal segments mediate functional interactions with TBP and Brf1 [#0, #1]. BDP1 is recruited to promoters by the TFIIIC subunit Tfc4 through its TPR array, overlapping the Brf1-binding region [#2], and at U6 snRNA promoters it is recruited by SNAPc bound to the U6 PSE [#11, #12], where the SNAPc–Bdp1 module can in turn recruit TBP [#13]. Assembly into TFIIIB is driven by its phylogenetically conserved SANT domain, whose helices 1 and 3 form a convex surface that anchors a defined segment (residues ~470–495) of Brf1 [#5, #8]; Bdp1 entry alters TBP–DNA contacts to impose sequence preference on the downstream TATA box [#6]. Within the preinitiation complex an essential N-terminal region of Bdp1 is positioned in the Pol III active-site cleft through cross-links to the catalytic subunit C128 and to the Rpc37/53 dimer, and this region is required to drive the closed-to-open transition during initiation [#9, #10, #11]. BDP1 is cell-cycle regulated: CK2 phosphorylates it during mitosis, causing dissociation from the U6 promoter and chromatin and repressing Pol III transcription [#4]. Beyond Pol III initiation, yeast Bdp1 physically interacts with RNase P, and a specific internal deletion impairs RPR1 transcription and tRNA processing [#1].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established that BDP1's yeast ortholog is a bona fide structural subunit of TFIIIB rather than an accessory factor, by showing it is required to reconstitute a transcription-competent complex.\",\n      \"evidence\": \"Recombinant reconstitution of TFIIIB with B''/Brf1/TBP, in vitro transcription and DNase I footprinting in S. cerevisiae\",\n      \"pmids\": [\"7568218\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve which domains contact TBP vs Brf1\", \"No structural information on the assembled complex\", \"Truncatable termini left functional roles of N/C ends undefined\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Mapped which Bdp1 segments engage TBP and Brf1 and revealed an unexpected physical link to RNase P, broadening its role beyond Pol III initiation to RNA processing.\",\n      \"evidence\": \"Deletion analysis, genetic suppression by SPT15/BRF1, co-IP and pull-down, in vitro transcription in yeast\",\n      \"pmids\": [\"11971960\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of the RNase P interaction in vivo not defined\", \"Structural basis of TBP/Brf1 contacts not resolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defined how BDP1 is recruited to chromatin by identifying the TFIIIC subunit Tfc4 surface that delivers both Brf1 and Bdp1 onto promoter DNA.\",\n      \"evidence\": \"Mutagenesis (Tfc4 L469K), biochemical binding assays, reporter transcription; plus internal Bdp1 deletion (aa253–269) in vitro assembly assays\",\n      \"pmids\": [\"12930823\", \"12885403\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Recruitment shown for yeast TFIIIC; mammalian equivalent not addressed here\", \"Order of Brf1 vs Bdp1 loading not fully resolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Explained cell-cycle control of Pol III transcription by showing CK2 phosphorylation of human Bdp1 during mitosis drives its dissociation from chromatin.\",\n      \"evidence\": \"In vitro kinase assay, ChIP at U6 promoter, mitotic extract transcription with CK2 inhibitor rescue in human cells\",\n      \"pmids\": [\"15469824\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphosite identity and structural impact not defined\", \"Whether the same applies to Brf1-TFIIIB at all gene classes not tested\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Localized the principal Brf1–Bdp1 anchoring interaction to the conserved SANT domain and showed Bdp1 incorporation reshapes TBP–DNA sequence recognition.\",\n      \"evidence\": \"Site-directed mutagenesis, photochemical protein-DNA cross-linking, SELEX with altered-specificity TBP in vitro\",\n      \"pmids\": [\"16551611\", \"17028095\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic interface not yet resolved at this stage\", \"Generality of TATA preference shift across Pol III gene classes unclear\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Resolved the Brf1–Bdp1 interface at residue level, defining the SANT helix1/helix3 convex surface as the docking site.\",\n      \"evidence\": \"NMR spectroscopy and structural modeling of the Brf1–Bdp1 interaction\",\n      \"pmids\": [\"19086269\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mutagenesis validation of mapped residues not reported\", \"Single study, in isolation from full TFIIIB context\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Positioned an essential N-terminal region of Bdp1 inside the Pol III active-site cleft, linking it directly to the catalytic machinery and the Rpc37/53 hub.\",\n      \"evidence\": \"BPA photo-cross-linking and functional mutagenesis mapping Bdp1 contacts to C128, Brf1 and Rpc37 in yeast; earlier Rpc37 hub mapping\",\n      \"pmids\": [\"26055328\", \"21536656\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cross-linking does not give an atomic structure of the cleft-bound state\", \"Mechanistic step driven by this region not yet defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Provided the structural basis for Bdp1 assembly into TFIIIB and a mechanism for its role in initiation, showing similarity to Pol II factors TFIIA/TFIIF and a concerted closed-to-open transition.\",\n      \"evidence\": \"2.7 Å crystal structure of human Brf2-TBP-Bdp1-DNA, single-molecule FRET, in vitro assays; Bdp1–SNAPc interaction\",\n      \"pmids\": [\"28743884\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure is of Brf2-TFIIIB; full open-complex with Pol III not captured\", \"Dynamics of SNAPc handoff not structurally resolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined the SNAPc-dependent recruitment pathway at U6 promoters, showing Bdp1 is recruited by promoter-bound SNAPc in a PSE-specific manner and can in turn recruit TBP.\",\n      \"evidence\": \"In vitro binding, promoter-specificity and deletion mapping; cross-linking mass spectrometry and UV cross-linking in Drosophila\",\n      \"pmids\": [\"29932462\", \"32253345\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mapped in Drosophila; human SNAPc–Bdp1 geometry not directly shown\", \"Conformational basis of U6 vs U1 PSE discrimination inferred, not solved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CK2 phosphorylation, the active-site-cleft N-terminal region, and SNAPc/TFIIIC recruitment are integrated into a single dynamic cycle of Pol III initiation and cell-cycle regulation remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of a complete Bdp1-containing open Pol III preinitiation complex\", \"Functional role of the human BDP1–ZNF297B and Bdp1–RNase P interactions undefined\", \"Phosphosite-level mechanism of mitotic dissociation not mapped onto structure\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 11]},\n      {\"term_id\": \"GO:0140223\", \"supporting_discovery_ids\": [0, 11]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [2, 13]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 11]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [1, 11]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"complexes\": [\"TFIIIB\"],\n    \"partners\": [\"BRF1\", \"BRF2\", \"TBP\", \"TFC4\", \"SNAPC\", \"RPC37\", \"ZNF297B\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}