{"gene":"TAF1","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":1996,"finding":"TAF1 (TAFII250) possesses intrinsic histone acetyltransferase (HAT) activity in vitro, acetylating histones H3 and H4. HAT activity maps to the central, most conserved portion of the protein. Drosophila and yeast homologs share this activity.","method":"In vitro HAT assay with recombinant protein and histone substrates; domain mapping by deletion analysis","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct in vitro enzymatic assay replicated across human, Drosophila, and yeast homologs with domain mapping","pmids":["8980232"],"is_preprint":false},{"year":1993,"finding":"Human TAFII250 (TAF1) binds directly to TBP both in vitro and in yeast, and participates in TFIID complex formation, serving as a scaffold for complex assembly.","method":"Recombinant protein binding assays in vitro and in yeast two-hybrid/functional complementation; co-immunoprecipitation","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct binding demonstrated in vitro and in vivo with functional rescue, replicated across multiple studies","pmids":["7680771"],"is_preprint":false},{"year":1996,"finding":"TAF1 (TAFII250) is a bipartite serine protein kinase that selectively phosphorylates RAP74 (large subunit of TFIIF) but not other basal transcription factors. The protein contains two distinct kinase domains, each capable of autophosphorylation, but both N- and C-terminal kinase domains are required for efficient trans-phosphorylation of RAP74.","method":"In vitro kinase assay with purified recombinant TAFII250 and RAP74; deletion analysis of kinase domains","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstituted kinase assay with substrate specificity tested against multiple proteins and domain mapping by deletion mutagenesis","pmids":["8625415"],"is_preprint":false},{"year":2004,"finding":"TAF1 phosphorylates p53 at Thr-55 in vivo, promoting p53 degradation and G1 cell cycle progression. Substitution of Thr-55 with alanine stabilizes p53 and impairs TAF1-induced G1 progression. RNAi-mediated TAF1 ablation and pharmacological inhibition of TAF1 kinase activity markedly reduced Thr-55 phosphorylation.","method":"In vivo phosphorylation assay, site-directed mutagenesis (T55A), RNAi knockdown, co-immunoprecipitation, kinase inhibitor treatment","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal methods (mutagenesis, RNAi, pharmacological inhibition) in single lab establishing substrate-writer relationship","pmids":["15053879"],"is_preprint":false},{"year":2013,"finding":"TAF1 phosphorylates p53 at Thr55, causing p53 dissociation from the p21 promoter and inactivation of transcription late in the DNA damage response. Cellular ATP levels act as a molecular switch for Thr55 phosphorylation; PARP-1-dependent ATP depletion upon DNA damage reduces TAF1 kinase activity. ChIP-seq showed genome-wide dissociation of p53 from promoters as cells recover.","method":"In vivo kinase assay, ChIP-seq, ATP depletion experiments, PARP-1 inhibition","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal methods including genome-wide ChIP-seq and mechanistic dissection of ATP sensing, single lab","pmids":["24289924"],"is_preprint":false},{"year":2005,"finding":"TAF1 directly contacts the downstream core element (DCE) of the human beta-globin promoter in a sequence-dependent manner, as demonstrated by UV photo-cross-linking. DCE function is recapitulated in a TFIID-dependent manner.","method":"UV photo-cross-linking, promoter deletion/mutagenesis, in vitro transcription","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct UV cross-linking establishes sequence-specific DNA contact, supported by in vitro transcription, single lab","pmids":["16227614"],"is_preprint":false},{"year":2013,"finding":"Crystal structure (1.97 Å) and NMR analysis of yeast TAF1 N-terminal domains TAND1 and TAND2 bound to TBP revealed that TAND1 occupies TBP's concave DNA-binding surface using anchor residues similar to Mot1, while TAND2 uses an aromatic and acidic anchoring pattern to bind a conserved TBP surface groove. These interactions regulate TBP-DNA binding.","method":"X-ray crystallography, NMR, mutational analysis, in vitro binding assays","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure plus NMR plus mutational validation in single rigorous study","pmids":["23851461"],"is_preprint":false},{"year":2014,"finding":"Crystal structure of the human TAF1 central core domain in complex with TAF7 revealed an inter-digitated compact architecture with a TAF1 winged-helix (WH) domain mounted on a heterodimeric triple barrel. The TAF1 WH domain has intrinsic DNA-binding activity; mutations of key WH residues compromise DNA binding and abrogate rescue of the ts13 mutant phenotype. The ts13 mutant residue is buried at the junction of the two structural domains.","method":"X-ray crystallography, DNA-binding assays, mutagenesis, ts13 complementation assay","journal":"Cell research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure combined with mutagenesis and functional complementation in single study","pmids":["25412659"],"is_preprint":false},{"year":2014,"finding":"Crystal structure of yeast TAF1-TAF7 complex at 2.9 Å revealed novel architecture with large hydrophobic heterodimer interface and extensive cofolding. The TAF1-TAF7 complex surface contains a pocket that selectively binds an inhibitory trimethylated histone H3 mark on Lys27, in a manner regulated by phosphorylation at neighboring H3 serine, suggesting TFIID reads epigenetic marks to regulate PIC assembly.","method":"X-ray crystallography, histone peptide binding assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — crystal structure with binding assay, single lab, limited functional validation","pmids":["24927529"],"is_preprint":false},{"year":2000,"finding":"TAF1 acetyltransferase activity is required for cell cycle progression. Mutagenesis of the acetyl-CoA binding site in TAF1 produces a protein with significantly reduced HAT activity but retained TBP and TAF150 binding. This HAT-deficient mutant cannot complement ts13 cell cycle arrest or transcriptional defects. The ts13 allele of TAF1 has temperature-sensitive HAT activity.","method":"Site-directed mutagenesis of acetyl-CoA binding site, in vitro HAT assay, ts13 complementation, transcription assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis of catalytic residue with in vitro enzyme assay and in vivo functional rescue test, multiple orthogonal methods","pmids":["10648598"],"is_preprint":false},{"year":1998,"finding":"Point mutations within two patches in the TAF1 N-terminal kinase domain (aa 1–414) decrease both autophosphorylation and trans-phosphorylation activities. TAF1 bearing these kinase domain mutations shows significantly reduced ability to rescue ts13 cells and impairs transcription from the cyclin A and cdc2 promoters in vivo.","method":"Site-directed mutagenesis of kinase domain, in vitro kinase assay, ts13 complementation, promoter-reporter transcription assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis with enzyme assay and in vivo functional rescue, multiple orthogonal methods, single lab","pmids":["9660973"],"is_preprint":false},{"year":1995,"finding":"TAF1 (TAFII250) specifically interacts with RAP74 subunit of TFIIF. In vivo complementation of temperature-sensitive TAFII250 cells shows that the RAP74 interaction is critical for cell viability. Binding interfaces between TAFII250 and RAP74 were mapped using in vitro binding assays.","method":"In vitro binding assays (GST pulldown, far-western), in vivo complementation of ts13 cells","journal":"Genes & development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal binding assays with in vivo functional validation, two orthogonal approaches, single lab","pmids":["7590250"],"is_preprint":false},{"year":1997,"finding":"Transcription of the cyclin A gene is directed by ATF family activators in a TAFII250-dependent manner. The cyclin A TSRE enhancer element confers TAFII250 dependence; chimeric promoter constructs demonstrate TAFII250 is required both for upstream activator function (ATF binding) and core promoter activity.","method":"Temperature-sensitive ts13 cell system, chimeric promoter analysis, transient transfection, microsequencing of purified TSRE-binding proteins","journal":"Genes & development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis via ts13 mutant combined with chimeric promoter dissection and protein identification, single lab","pmids":["9334328"],"is_preprint":false},{"year":1995,"finding":"Rb (retinoblastoma protein) binds directly to hTAFII250 both in vitro and in vivo. This interaction is required for Rb-stimulated Sp1-mediated transcription, which is disrupted at the nonpermissive temperature in ts13 cells and restored by wild-type TAFII250.","method":"GST pulldown (in vitro binding), co-immunoprecipitation (in vivo), ts13 complementation with transcription assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal binding assays in vitro and in vivo with functional rescue, single lab","pmids":["7724524"],"is_preprint":false},{"year":1999,"finding":"Rb inhibits the intrinsic bipartite kinase activity of TAFII250, including autophosphorylation and phosphorylation of RAP74. Inhibition requires the Rb pocket domain (aa 379–928) and specifically targets the N-terminal kinase domain through direct protein-protein interaction. Two tumor-derived Rb pocket mutants (C706F, Δex22) are defective for kinase inhibition despite retaining TAFII250 binding.","method":"In vitro kinase assay with immunopurified and recombinant TAFII250, Rb domain deletion analysis, tumor-derived mutant analysis","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro enzyme inhibition assay with domain mapping and tumor mutant analysis, single lab","pmids":["9858607"],"is_preprint":false},{"year":1997,"finding":"MDM2 C-terminal Ring finger domain binds TAFII250/CCG1, while its central acidic domain binds TBP. MDM2 binding to TAFII250 correlates with MDM2 activation of the cyclin A promoter but not c-fos. Deletion of the MDM2 C-terminal region abolishes activation.","method":"Co-immunoprecipitation from mammalian cells, GST pulldown in vitro, promoter-reporter transcription assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and in vitro binding with functional promoter assays, single lab","pmids":["9388200"],"is_preprint":false},{"year":2001,"finding":"TAFII55 binds to the RAP74-binding domain of TAFII250 (aa 848-1279) and inhibits its acetyltransferase activity. Addition of recombinant TAFII55 to in vitro transcription assays inhibits TAFII250-dependent MHC class I transcription.","method":"Yeast two-hybrid screen, co-immunoprecipitation, in vitro HAT assay, in vitro transcription assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid plus in vitro enzyme inhibition plus functional transcription assay, single lab","pmids":["11592977"],"is_preprint":false},{"year":2012,"finding":"TAF7 binding to TAF1 inhibits TAF1 HAT activity; TAF1-mediated phosphorylation of TAF7 at Ser-264 disrupts the TAF1/TAF7 interaction within TFIID, leading to activation of TAF1 HAT activity, increased histone H3 acetylation at cyclin D1 and cyclin A promoters, and stimulation of their transcription.","method":"Co-immunoprecipitation, HAT activity assay, site-directed mutagenesis (S264A and S264D phosphomutants), ChIP, siRNA knockdown, overexpression","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — phosphomutant analysis combined with HAT assay, ChIP, and functional transcription readout; multiple orthogonal methods, single lab","pmids":["22711989"],"is_preprint":false},{"year":2001,"finding":"c-Jun binds with high specificity to the N-terminal 163 amino acids of TAF1 (TAFII250). This same region represses TBP-DNA binding activity. c-Jun blocks TBP repression by the TAF1 N-terminus, derepressing TFIID-driven transcription in vitro, providing a mechanism for c-Jun-mediated transcriptional activation.","method":"In vitro binding assays, EMSA, in vitro transcription reconstitution, mapping with N-terminal domain fragments","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding mapped by domain analysis plus functional reconstituted transcription assay, single lab","pmids":["11316804"],"is_preprint":false},{"year":2004,"finding":"The bZIP domain of c-Jun (basic leucine zipper) is necessary and sufficient for interaction with the N-terminus of hsTAF1, and the isolated bZIP domain can derepress TFIID-directed basal transcription in vitro. c-Fos alone does not interact with hsTAF1, but c-Fos/c-Jun heterodimers do bind.","method":"In vitro binding assay, in vitro transcription, domain mapping of c-Jun","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mapping with binding assay and functional transcription reconstitution, single lab","pmids":["15087451"],"is_preprint":false},{"year":2010,"finding":"TAF1 directly binds Pax3 and mediates its monoubiquitination via TAF1's ubiquitin-activating/conjugating (E1/E2) activity. TAF1 overexpression increases monoubiquitinated Pax3 and its proteasomal degradation; TAF1 depletion reduces Pax3 monoubiquitination, increases Pax3 protein levels, and inhibits myogenic differentiation and myoblast migration.","method":"GST pulldown, co-immunoprecipitation, ubiquitination assay, TAF1 overexpression/knockdown, differentiation and migration assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — direct binding, in vitro ubiquitination assay, and functional cellular phenotype with gain/loss of function; multiple methods, single lab","pmids":["21145483"],"is_preprint":false},{"year":1999,"finding":"Cyclin D1 associates with TAFII250 (TAF1) N-terminal domain (aa 1–434) both in mammalian cells and in baculovirus-infected insect cells, and in vitro via GST pulldown. The N-terminus of cyclin D1 (aa 1–100) is sufficient for this interaction and for repressing Sp1-mediated transcription. Rb or CDK4 overexpression reduces the level of TAFII250-cyclin D1 complex.","method":"Co-immunoprecipitation, GST pulldown, promoter-reporter transcription assays, domain deletion analysis","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP in multiple cell systems plus in vitro binding and functional transcription assay, single lab","pmids":["9926939"],"is_preprint":false},{"year":2007,"finding":"TAFII250 stimulates Mdm2-dependent ubiquitylation and degradation of p53. Mechanistically, TAFII250 downregulates Mdm2 auto-ubiquitylation leading to Mdm2 stabilization, and promotes p53-Mdm2 association through the acidic domain of Mdm2. TAFII250 inactivation in ts13 cells leads to p53 induction and cell cycle arrest.","method":"Ubiquitylation assay, co-immunoprecipitation, ts13 temperature-shift experiments","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitylation assay plus binding assays plus genetic (ts13) model, single lab","pmids":["17237821"],"is_preprint":false},{"year":2006,"finding":"Alternative pre-mRNA splicing of Drosophila TAF1 generates four mRNAs (TAF1-1 to TAF1-4). TAF1-2 and TAF1-4 encode proteins with AT-hook DNA-binding motifs. Ionizing-radiation-induced upregulation of TAF1-3 and TAF1-4 is mediated by ATM and CHK2; camptothecin-induced upregulation is mediated by ATR and CHK1, as demonstrated by pharmacological inhibitors and RNAi.","method":"RT-PCR, RNAi knockdown, pharmacological inhibitors of ATM/ATR/CHK1/CHK2, reporter assays","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi and pharmacological pathway dissection with specific isoform readout, single lab","pmids":["17030624"],"is_preprint":false},{"year":2006,"finding":"Drosophila TAF1 isoforms TAF1-2 and TAF1-4 (bearing two AT-hook motifs, one alternatively spliced) directly bind DNA in the minor groove of AT-rich sequences with preference for AAT, independently of TAF2. Alanine-scanning mutagenesis of the AT-hook identifies essential Lys and Arg residues for DNA contact.","method":"EMSA, alanine-scanning mutagenesis, DNA binding competition assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — direct binding assay combined with mutagenesis establishing mechanism, single lab","pmids":["16893881"],"is_preprint":false},{"year":2007,"finding":"Among general TFIID subunits (TBP, TAF1, TAF4, TAF5, TAF9), only TAF1 colocalizes with the testis-specific tTAF Mia in spermatocyte nucleoli. Nucleolar localization of TAF1 is disrupted in tTAF mutant flies, suggesting stepwise assembly of a testis-specific TFIID complex where a TAF1 isoform (TAF1-2) is recruited to a tTAF core subassembly.","method":"Immunofluorescence microscopy in Drosophila testes, analysis of tTAF mutant flies","journal":"Developmental dynamics","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct localization with genetic epistasis in mutant animals, single lab","pmids":["17823958"],"is_preprint":false},{"year":2002,"finding":"TAF1 binds directly to the ribosomal DNA transcription activator UBF, colocalizes with UBF in the nucleolus of HeLa cells, and stimulates RNA polymerase I transcription in a dosage-dependent manner in cotransfection and in vitro transcription assays.","method":"Yeast two-hybrid, co-immunoprecipitation, confocal microscopy, cell fractionation, cotransfection reporter assay, in vitro transcription","journal":"Current biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods including in vitro transcription and localization, single lab","pmids":["12498690"],"is_preprint":false},{"year":2004,"finding":"TAF1 directly interacts with the androgen receptor (AR) N-terminus through its acetyltransferase and ubiquitin-activating/conjugating (E1/E2) domains. TAF1 and AR colocalize on the PSA promoter/enhancer. TAF1 overexpression enhances AR transcriptional activity and increases polyubiquitinated AR levels; TAF1 knockdown decreases AR transactivation.","method":"Yeast two-hybrid, GST pulldown, co-immunoprecipitation, ChIP, transactivation assays, siRNA knockdown","journal":"Molecular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (pulldown, Co-IP, ChIP, functional assay), single lab","pmids":["20181722"],"is_preprint":false},{"year":2004,"finding":"Inactivation of TAF1 in ts13 cells activates an ATR-mediated DNA damage response: ATR rapidly localizes to subnuclear foci, and downstream targets including p53 and Chk1 are phosphorylated, resulting in G1 cell cycle arrest. Dominant negative ATR (but not dominant negative ATM) overrides the G1 arrest.","method":"Immunofluorescence, immunoblotting, caffeine inhibition, dominant negative ATR/ATM expression, ts13 temperature-shift","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pathway placement by dominant-negative epistasis plus pharmacological inhibition, single lab","pmids":["15169897"],"is_preprint":false},{"year":2023,"finding":"Human TFIID biogenesis occurs co-translationally, with all protein heterodimerization steps happening during protein synthesis. TAF1 acts as a flexible scaffold that drives co-translational recruitment of TFIID submodules preassembled in the cytoplasm, with the complex assembling onto the nascent TAF1 polypeptide in a hierarchical multistep manner.","method":"RNA immunoprecipitation (RIP), single-molecule imaging, proteomics, structure-function analysis","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal approaches (RIP, single-molecule imaging, proteomics) in single rigorous study establishing mechanism","pmids":["37386215"],"is_preprint":false},{"year":2005,"finding":"TAF1 HAT activity is required for histone H3 acetylation at the cyclin D1 promoter (but not c-fos), facilitating transcription factor binding to Sp1 sites and activating cyclin D1 transcription and G1-to-S phase progression. HAT-deficient TAF1 mutants (Δ844-850, Δ848-850) cannot complement ts13 cell cycle arrest or cyclin D1 transcription. TSA treatment restores activity, indicating H3 acetylation mediates the effect.","method":"HAT domain mutagenesis, ChIP, in vivo genomic footprinting, ts13 complementation, trichostatin A treatment","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — mutagenesis plus ChIP plus genomic footprinting plus functional rescue, multiple orthogonal methods, single lab","pmids":["15870300"],"is_preprint":false},{"year":2018,"finding":"TAF1 zinc knuckle domain in the C-terminal half is a second DNA-binding module that aids recruitment of TFIID to endogenous promoters. Mutations in the zinc knuckle with defects in DNA binding compromise TFIID promoter occupancy, decrease transcription, and reduce cell viability.","method":"Domain identification and mutagenesis, DNA binding assays, ChIP, cell viability assays","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis with DNA binding assay and ChIP functional readout, single lab","pmids":["29545534"],"is_preprint":false},{"year":2019,"finding":"TAF1 associates with K43-acetylated AML1-ETO (AE) fusion protein; ChIP-seq shows significant overlap of TAF1 and AE binding sites. TAF1 knockdown alters AE association with chromatin and affects expression of AE-regulated genes. TAF1 is required for leukemic cell self-renewal; its reduction promotes differentiation and apoptosis of AE+ AML cells.","method":"Co-immunoprecipitation, ChIP-seq, shRNA knockdown, gene expression analysis, differentiation/apoptosis assays","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus genome-wide ChIP-seq plus functional cellular assays, single lab","pmids":["31664040"],"is_preprint":false},{"year":2019,"finding":"SRRM4/nSR100 splicing factor promotes inclusion of the neuronal microexon 34' into TAF1 mRNA through recognition of UGC sequences in the polypyrimidine tract upstream of the microexon. Knockdown and ectopic expression of SRRM4 in cells directly regulate microexon 34' inclusion, generating a neuronal-specific TAF1 isoform.","method":"RNAi knockdown, ectopic expression, isoform-specific RT-PCR and antibodies, mutagenesis of splicing elements","journal":"RNA biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional manipulation (knockdown and overexpression) with RNA splicing readout and identification of regulatory sequence elements, single lab","pmids":["31559909"],"is_preprint":false},{"year":2002,"finding":"Human TAF1L (a retroposed TAF1 homolog expressed specifically in testis) can bind TBP and functionally substitute for TAF1 by rescuing the temperature-sensitive lethality of TAFII250-mutant hamster cells. TAF1L lacks introns and arose by retroposition of a processed TAF1 mRNA.","method":"TBP binding assay, ts13 complementation assay, expression analysis","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding assay plus functional complementation rescue, single lab","pmids":["12217962"],"is_preprint":false},{"year":2004,"finding":"NMR and mutagenesis of yeast TAF1 TAND1 (residues 10–37) and TAND2 (residues 46–71) showed that TAND1 (two alpha-helices) interacts with the concave DNA-binding surface of TBP, while TAND2 (mini beta-sheet) interacts with the convex TBP alpha-helix 2. The minimal region for GAL4-dependent transcriptional activation corresponds to the first TAND1 helix.","method":"NMR structure determination, mutagenesis, yeast genetic assay, in vitro binding","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structural data with mutagenesis and in vivo functional assay, single rigorous study","pmids":["15165843"],"is_preprint":false},{"year":2003,"finding":"The cytoplasmic domain of Xenopus NF-protocadherin (NFPC) binds TAF1/SET (a histone-associated protein). NFPC and TAF1 co-precipitate from embryo extracts; TAF1 rescues ectodermal disruptions caused by dominant-negative NFPC. Antisense morpholino knockdown of either NFPC or TAF1 produces identical ectodermal defects.","method":"Co-immunoprecipitation from Xenopus embryos, rescue experiment, antisense morpholino knockdown","journal":"Developmental cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional rescue plus parallel morpholino knockdown phenotypes, single lab","pmids":["12636922"],"is_preprint":false},{"year":2000,"finding":"High-density gene profiling in ts13 cells revealed that at least 18% of genes are differentially expressed at the restrictive temperature (TAF1 acetyltransferase inactivation). Approximately 6% of genes require a functional TAF1 N-terminal kinase domain, and only ~1% of those also require TAF1 acetyltransferase activity, indicating the two enzymatic activities regulate largely non-overlapping gene sets.","method":"Microarray gene profiling in ts13 cells with N-terminal kinase domain mutants vs. acetyltransferase domain mutants","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide analysis with two distinct domain mutants distinguishing non-overlapping gene sets, single lab","pmids":["10716982"],"is_preprint":false},{"year":2000,"finding":"Cyclin D1 suppresses Rb-mediated inhibition of TAFII250 kinase activity: when cyclin D1 is coincubated with Rb and TAFII250, Rb's ability to inhibit TAFII250 kinase is blocked. Cyclin D1 acts through its association with TAFII250 (not Rb). The related protein p107 can also inhibit TAFII250 kinase, an effect likewise alleviated by cyclin D1.","method":"In vitro kinase assay with purified proteins, co-immunoprecipitation","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 1–2 / Weak — in vitro enzyme assay with reconstituted three-protein system, single lab, single study","pmids":["11126356"],"is_preprint":false},{"year":2004,"finding":"TAF1 TAF-N terminal domain (TAND1) undergoes induced folding from a largely unstructured to globular state upon binding TBP, occupying TBP's DNA-binding surface and inhibiting TBP-DNA interaction (previously established in Drosophila). In yeast, TAND1 first helix and TAND2 beta-sheet mediate the concave and convex TBP surface interactions respectively.","method":"NMR spectroscopy, mutagenesis, in vitro binding assays, yeast genetic assays","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structural analysis with mutagenesis and functional assays, single rigorous study","pmids":["15165843"],"is_preprint":false}],"current_model":"TAF1 is the largest subunit of the general transcription factor TFIID, functioning as a multi-enzymatic scaffold that: (1) binds TBP (via TAND1/TAND2 domains) and multiple TAF subunits to nucleate TFIID assembly co-translationally; (2) contacts core promoter DNA via a winged-helix domain, a zinc knuckle, and (in Drosophila) AT-hook motifs; (3) possesses histone acetyltransferase activity (acetylating H3/H4) required for chromatin remodeling at specific promoters such as cyclin D1; (4) acts as a bipartite serine kinase that phosphorylates RAP74/TFIIF and TAF7 (releasing its inhibitory effect on TAF1 HAT activity) and phosphorylates p53 at Thr-55 to promote p53 degradation and cell cycle progression; (5) possesses ubiquitin E1/E2-like activity that monoubiquitinates Pax3 targeting it for proteasomal degradation; and (6) mediates interactions with diverse regulators including Rb (which inhibits TAF1 kinase), cyclin D1, MDM2, c-Jun, and oncogenic fusion proteins such as AML1-ETO, thereby coupling transcriptional regulation to cell cycle control, DNA damage responses, and development."},"narrative":{"mechanistic_narrative":"TAF1 is the largest subunit of the general transcription factor TFIID, functioning as a multi-enzymatic scaffold that nucleates TFIID assembly, contacts core-promoter DNA, and couples transcriptional regulation to cell cycle control and DNA damage responses [PMID:7680771, PMID:37386215]. As the assembly platform, TAF1 binds TBP directly through its N-terminal TAND1/TAND2 domains, which fold upon binding and occupy distinct concave and convex TBP surfaces to regulate TBP-DNA interaction [PMID:7680771, PMID:23851461, PMID:15165843], and it drives co-translational, hierarchical recruitment of preassembled TFIID submodules onto the nascent TAF1 polypeptide [PMID:37386215]. TAF1 engages core-promoter DNA through multiple modules including a winged-helix domain mounted on the TAF1-TAF7 heterodimeric core, a C-terminal zinc knuckle, and sequence-specific contacts to downstream promoter elements, all of which support TFIID promoter occupancy and transcription [PMID:16227614, PMID:25412659, PMID:29545534]. TAF1 carries intrinsic histone acetyltransferase activity acetylating H3/H4 that is required for cell cycle progression and for H3 acetylation at the cyclin D1 promoter to enable Sp1-dependent activation and G1-to-S transition [PMID:8980232, PMID:10648598, PMID:15870300]; this HAT activity is held in check by the bound TAF7 subunit until TAF1-mediated phosphorylation of TAF7 at Ser-264 releases the inhibition [PMID:22711989]. TAF1 is also a bipartite serine kinase whose two domains cooperate to phosphorylate the TFIIF subunit RAP74 and to phosphorylate p53 at Thr-55, promoting MDM2-dependent p53 degradation, p53 dissociation from promoters, and G1 progression; this kinase activity is sensed via cellular ATP levels and inhibited by retinoblastoma protein [PMID:8625415, PMID:15053879, PMID:24289924, PMID:9858607, PMID:17237821]. Beyond TFIID, TAF1 monoubiquitinates Pax3 through its ubiquitin E1/E2-like activity to control myogenic differentiation [PMID:21145483], and integrates signals from regulators including Rb, cyclin D1, MDM2, c-Jun, and the oncogenic AML1-ETO fusion to direct gene-specific transcriptional programs [PMID:7724524, PMID:9926939, PMID:11316804, PMID:31664040]. Distinct gene sets depend on the kinase versus acetyltransferase activities, indicating its enzymatic functions regulate largely non-overlapping targets [PMID:10716982].","teleology":[{"year":1993,"claim":"Established TAF1 as the scaffolding anchor of TFIID by demonstrating it binds TBP directly and supports complex assembly, defining its core architectural role.","evidence":"Recombinant binding assays in vitro and in yeast, co-immunoprecipitation","pmids":["7680771"],"confidence":"High","gaps":["Did not resolve the structural basis of TBP contact","Did not address how other TAFs are recruited"]},{"year":1996,"claim":"Revealed that TAF1 is itself an enzyme, possessing intrinsic histone acetyltransferase activity, reframing TFIID from a passive factor to a chromatin-modifying machine.","evidence":"In vitro HAT assay with recombinant protein and histone substrates, domain mapping across human/Drosophila/yeast homologs","pmids":["8980232"],"confidence":"High","gaps":["In vitro substrate use did not establish the in vivo target genes","Did not address regulation of HAT activity"]},{"year":1996,"claim":"Identified a second enzymatic activity — a bipartite serine kinase phosphorylating RAP74/TFIIF — showing TAF1 transmits signals to the basal machinery.","evidence":"In vitro kinase assay with purified recombinant TAF1 and RAP74, deletion analysis of two kinase domains","pmids":["8625415"],"confidence":"High","gaps":["In vivo substrate repertoire unresolved","Functional consequence of RAP74 phosphorylation not defined"]},{"year":1995,"claim":"Connected TAF1 enzymatic and binding functions to cell physiology by showing RAP74 interaction and Rb binding are critical for viability and Sp1-mediated transcription via the ts13 system.","evidence":"GST pulldown, far-western, co-immunoprecipitation, ts13 complementation with transcription assays","pmids":["7590250","7724524"],"confidence":"Medium","gaps":["Mechanism linking Rb binding to transcription not fully defined","Did not separate scaffolding from enzymatic contributions"]},{"year":2000,"claim":"Genetically separated TAF1's two enzymatic activities, showing catalytic HAT residues are required for cell cycle progression and that kinase versus HAT domains regulate largely non-overlapping gene sets.","evidence":"Acetyl-CoA site and kinase-domain mutagenesis, ts13 complementation, transcription assays, genome-wide microarray profiling","pmids":["10648598","10716982","9660973"],"confidence":"High","gaps":["Direct in vivo histone substrates at most genes not mapped","Promoter-specific selectivity mechanism unresolved"]},{"year":2004,"claim":"Placed TAF1 kinase activity at the heart of cell cycle and DNA damage control by identifying p53 Thr-55 as a substrate whose phosphorylation drives p53 degradation and G1 progression, and showing TAF1 inactivation triggers an ATR-mediated arrest.","evidence":"In vivo phosphorylation, T55A mutagenesis, RNAi, kinase inhibition, dominant-negative ATR/ATM in ts13 cells","pmids":["15053879","15169897"],"confidence":"High","gaps":["How TAF1 kinase activity is timed during the cycle not fully resolved","Relationship between TFIID assembly and ATR signaling unclear"]},{"year":2005,"claim":"Linked HAT activity to a specific promoter program by showing TAF1-dependent H3 acetylation at the cyclin D1 promoter enables Sp1 binding and G1-to-S progression.","evidence":"HAT-domain mutagenesis, ChIP, in vivo genomic footprinting, ts13 complementation, TSA treatment","pmids":["15870300"],"confidence":"High","gaps":["Genome-wide scope of HAT-dependent acetylation not defined here","Selectivity for cyclin D1 over c-fos unexplained"]},{"year":2005,"claim":"Demonstrated TAF1 makes direct, sequence-specific contact with downstream core-promoter DNA, extending its role to promoter recognition beyond TBP.","evidence":"UV photo-cross-linking, promoter mutagenesis, in vitro transcription on the beta-globin DCE","pmids":["16227614"],"confidence":"Medium","gaps":["Single-promoter scope","Did not identify the responsible DNA-binding subdomain"]},{"year":2010,"claim":"Uncovered a third enzymatic activity, ubiquitin E1/E2-like activity, showing TAF1 monoubiquitinates Pax3 to control its degradation and myogenic differentiation.","evidence":"GST pulldown, co-IP, ubiquitination assay, gain/loss-of-function with differentiation and migration assays","pmids":["21145483"],"confidence":"High","gaps":["Structural basis of E1/E2 activity not defined","Other ubiquitination substrates unknown"]},{"year":2012,"claim":"Resolved how TAF1 HAT activity is regulated, showing TAF1 phosphorylation of TAF7 at Ser-264 disrupts an inhibitory TAF1-TAF7 contact to activate acetylation at cyclin promoters.","evidence":"Co-IP, HAT assay, S264A/S264D phosphomutants, ChIP, siRNA","pmids":["22711989"],"confidence":"High","gaps":["Trigger for TAF7 phosphorylation in vivo not defined","Generality across promoters not established"]},{"year":2014,"claim":"Provided structural mechanism for promoter DNA contact and epigenetic reading, resolving the TAF1-TAF7 core with a DNA-binding winged-helix domain and a pocket recognizing modified histone H3.","evidence":"X-ray crystallography of human and yeast TAF1-TAF7, DNA-binding assays, histone peptide binding, ts13 complementation","pmids":["25412659","24927529"],"confidence":"High","gaps":["In vivo role of the H3K27me3-reading pocket not validated","Coordination with other DNA-binding modules unresolved"]},{"year":2018,"claim":"Identified the C-terminal zinc knuckle as a second DNA-binding module required for TFIID promoter occupancy, transcription, and cell viability.","evidence":"Domain mutagenesis, DNA-binding assays, ChIP, viability assays","pmids":["29545534"],"confidence":"Medium","gaps":["How multiple DNA modules cooperate not defined","Genome-wide promoter dependency not mapped"]},{"year":2019,"claim":"Extended TAF1's role to leukemic gene regulation by showing it associates with acetylated AML1-ETO and is required for leukemic self-renewal.","evidence":"Co-IP, ChIP-seq, shRNA knockdown, differentiation/apoptosis assays in AE+ AML cells","pmids":["31664040"],"confidence":"Medium","gaps":["Whether TAF1 enzymatic activities mediate the effect unknown","Direct versus TFIID-mediated recruitment unresolved"]},{"year":2023,"claim":"Defined how TFIID is built, showing TAF1 acts as a flexible scaffold driving co-translational, hierarchical assembly of preformed submodules onto the nascent polypeptide.","evidence":"RNA immunoprecipitation, single-molecule imaging, proteomics, structure-function analysis","pmids":["37386215"],"confidence":"High","gaps":["How assembly couples to nuclear import not defined","Quality control of misassembled complexes unknown"]},{"year":null,"claim":"How TAF1's three distinct enzymatic activities (HAT, kinase, ubiquitin) are coordinated within a single TFIID scaffold and selectively deployed at specific promoters in vivo remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No integrated model linking enzymatic switching to gene selectivity","Physiological triggers governing each activity in cells not defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,9,30,2,3,17,20]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[2,3,17]},{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[20,27]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[5,7,31,24]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,29,12,30]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[8]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,29]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,29]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[25,26]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[29]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,29,30,12]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[3,4,9,30,28]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[0,30,17]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[4,28]}],"complexes":["TFIID"],"partners":["TBP","TAF7","RAP74","RB1","MDM2","CCND1","JUN","UBF"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P21675","full_name":"Transcription initiation factor TFIID subunit 1","aliases":["Cell cycle gene 1 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TFIID recognizes and binds promoters with or without a TATA box via its subunit TBP, a TATA-box-binding protein, and promotes assembly of the pre-initiation complex (PIC) (PubMed:33795473). The TFIID complex consists of TBP and TBP-associated factors (TAFs), including TAF1, TAF2, TAF3, TAF4, TAF5, TAF6, TAF7, TAF8, TAF9, TAF10, TAF11, TAF12 and TAF13 (PubMed:33795473). TAF1 is the largest component and core scaffold of the TFIID complex, involved in nucleating complex assembly (PubMed:25412659, PubMed:27007846, PubMed:33795473). TAF1 forms a promoter DNA binding subcomplex of TFIID, together with TAF7 and TAF2 (PubMed:33795473). Contains novel N- and C-terminal Ser/Thr kinase domains which can autophosphorylate or transphosphorylate other transcription factors (PubMed:25412659, PubMed:8625415). Phosphorylates TP53 on 'Thr-55' which leads to MDM2-mediated degradation of TP53 (PubMed:25412659). Phosphorylates GTF2A1 and GTF2F1 on Ser residues (PubMed:25412659). Possesses DNA-binding activity (PubMed:25412659). Essential for progression of the G1 phase of the cell cycle (PubMed:11278496, PubMed:15053879, PubMed:2038334, PubMed:8450888, PubMed:8625415, PubMed:9660973, PubMed:9858607). Exhibits histone acetyltransferase activity towards histones H3 and H4 (PubMed:15870300)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P21675/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/TAF1","classification":"Common Essential","n_dependent_lines":924,"n_total_lines":1208,"dependency_fraction":0.7649006622516556},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000147133","cell_line_id":"CID001903","localizations":[{"compartment":"nucleoplasm","grade":3}],"interactors":[{"gene":"TAF4","stoichiometry":10.0},{"gene":"TAF9B","stoichiometry":10.0},{"gene":"CHD3","stoichiometry":10.0}],"url":"https://opencell.sf.czbiohub.org/target/CID001903","total_profiled":1310},"omim":[{"mim_id":"612641","title":"ANKYRIN 1; ANK1","url":"https://www.omim.org/entry/612641"},{"mim_id":"609904","title":"HISTONE GENE CLUSTER 1, H2B HISTONE FAMILY, MEMBER A; HIST1H2BA","url":"https://www.omim.org/entry/609904"},{"mim_id":"609837","title":"SMALL NUCLEOLAR RNA, C/D BOX, 115-1; SNORD115-1","url":"https://www.omim.org/entry/609837"},{"mim_id":"609514","title":"TATA BOX-BINDING PROTEIN-ASSOCIATED FACTOR 8; TAF8","url":"https://www.omim.org/entry/609514"},{"mim_id":"609189","title":"ANTI-SILENCING FUNCTION 1A HISTONE CHAPERONE; ASF1A","url":"https://www.omim.org/entry/609189"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TAF1"},"hgnc":{"alias_symbol":["NSCL2","TAFII250","KAT4","DYT3/TAF1"],"prev_symbol":["TAF2A","BA2R","CCG1","CCGS","DYT3"]},"alphafold":{"accession":"P21675","domains":[{"cath_id":"-","chopping":"1164-1215","consensus_level":"medium","plddt":75.466,"start":1164,"end":1215},{"cath_id":"1.20.920.10","chopping":"1380-1496","consensus_level":"medium","plddt":89.3338,"start":1380,"end":1496},{"cath_id":"1.20.920.10","chopping":"1502-1631","consensus_level":"medium","plddt":89.3089,"start":1502,"end":1631}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P21675","model_url":"https://alphafold.ebi.ac.uk/files/AF-P21675-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P21675-F1-predicted_aligned_error_v6.png","plddt_mean":61.84},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TAF1","jax_strain_url":"https://www.jax.org/strain/search?query=TAF1"},"sequence":{"accession":"P21675","fasta_url":"https://rest.uniprot.org/uniprotkb/P21675.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P21675/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P21675"}},"corpus_meta":[{"pmid":"8980232","id":"PMC_8980232","title":"The 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acetylating histones H3 and H4. HAT activity maps to the central, most conserved portion of the protein. Drosophila and yeast homologs share this activity.\",\n      \"method\": \"In vitro HAT assay with recombinant protein and histone substrates; domain mapping by deletion analysis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct in vitro enzymatic assay replicated across human, Drosophila, and yeast homologs with domain mapping\",\n      \"pmids\": [\"8980232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Human TAFII250 (TAF1) binds directly to TBP both in vitro and in yeast, and participates in TFIID complex formation, serving as a scaffold for complex assembly.\",\n      \"method\": \"Recombinant protein binding assays in vitro and in yeast two-hybrid/functional complementation; co-immunoprecipitation\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct binding demonstrated in vitro and in vivo with functional rescue, replicated across multiple studies\",\n      \"pmids\": [\"7680771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"TAF1 (TAFII250) is a bipartite serine protein kinase that selectively phosphorylates RAP74 (large subunit of TFIIF) but not other basal transcription factors. The protein contains two distinct kinase domains, each capable of autophosphorylation, but both N- and C-terminal kinase domains are required for efficient trans-phosphorylation of RAP74.\",\n      \"method\": \"In vitro kinase assay with purified recombinant TAFII250 and RAP74; deletion analysis of kinase domains\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstituted kinase assay with substrate specificity tested against multiple proteins and domain mapping by deletion mutagenesis\",\n      \"pmids\": [\"8625415\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"TAF1 phosphorylates p53 at Thr-55 in vivo, promoting p53 degradation and G1 cell cycle progression. Substitution of Thr-55 with alanine stabilizes p53 and impairs TAF1-induced G1 progression. RNAi-mediated TAF1 ablation and pharmacological inhibition of TAF1 kinase activity markedly reduced Thr-55 phosphorylation.\",\n      \"method\": \"In vivo phosphorylation assay, site-directed mutagenesis (T55A), RNAi knockdown, co-immunoprecipitation, kinase inhibitor treatment\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal methods (mutagenesis, RNAi, pharmacological inhibition) in single lab establishing substrate-writer relationship\",\n      \"pmids\": [\"15053879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TAF1 phosphorylates p53 at Thr55, causing p53 dissociation from the p21 promoter and inactivation of transcription late in the DNA damage response. Cellular ATP levels act as a molecular switch for Thr55 phosphorylation; PARP-1-dependent ATP depletion upon DNA damage reduces TAF1 kinase activity. ChIP-seq showed genome-wide dissociation of p53 from promoters as cells recover.\",\n      \"method\": \"In vivo kinase assay, ChIP-seq, ATP depletion experiments, PARP-1 inhibition\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal methods including genome-wide ChIP-seq and mechanistic dissection of ATP sensing, single lab\",\n      \"pmids\": [\"24289924\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"TAF1 directly contacts the downstream core element (DCE) of the human beta-globin promoter in a sequence-dependent manner, as demonstrated by UV photo-cross-linking. DCE function is recapitulated in a TFIID-dependent manner.\",\n      \"method\": \"UV photo-cross-linking, promoter deletion/mutagenesis, in vitro transcription\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct UV cross-linking establishes sequence-specific DNA contact, supported by in vitro transcription, single lab\",\n      \"pmids\": [\"16227614\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Crystal structure (1.97 Å) and NMR analysis of yeast TAF1 N-terminal domains TAND1 and TAND2 bound to TBP revealed that TAND1 occupies TBP's concave DNA-binding surface using anchor residues similar to Mot1, while TAND2 uses an aromatic and acidic anchoring pattern to bind a conserved TBP surface groove. These interactions regulate TBP-DNA binding.\",\n      \"method\": \"X-ray crystallography, NMR, mutational analysis, in vitro binding assays\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus NMR plus mutational validation in single rigorous study\",\n      \"pmids\": [\"23851461\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Crystal structure of the human TAF1 central core domain in complex with TAF7 revealed an inter-digitated compact architecture with a TAF1 winged-helix (WH) domain mounted on a heterodimeric triple barrel. The TAF1 WH domain has intrinsic DNA-binding activity; mutations of key WH residues compromise DNA binding and abrogate rescue of the ts13 mutant phenotype. The ts13 mutant residue is buried at the junction of the two structural domains.\",\n      \"method\": \"X-ray crystallography, DNA-binding assays, mutagenesis, ts13 complementation assay\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure combined with mutagenesis and functional complementation in single study\",\n      \"pmids\": [\"25412659\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Crystal structure of yeast TAF1-TAF7 complex at 2.9 Å revealed novel architecture with large hydrophobic heterodimer interface and extensive cofolding. The TAF1-TAF7 complex surface contains a pocket that selectively binds an inhibitory trimethylated histone H3 mark on Lys27, in a manner regulated by phosphorylation at neighboring H3 serine, suggesting TFIID reads epigenetic marks to regulate PIC assembly.\",\n      \"method\": \"X-ray crystallography, histone peptide binding assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — crystal structure with binding assay, single lab, limited functional validation\",\n      \"pmids\": [\"24927529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"TAF1 acetyltransferase activity is required for cell cycle progression. Mutagenesis of the acetyl-CoA binding site in TAF1 produces a protein with significantly reduced HAT activity but retained TBP and TAF150 binding. This HAT-deficient mutant cannot complement ts13 cell cycle arrest or transcriptional defects. The ts13 allele of TAF1 has temperature-sensitive HAT activity.\",\n      \"method\": \"Site-directed mutagenesis of acetyl-CoA binding site, in vitro HAT assay, ts13 complementation, transcription assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis of catalytic residue with in vitro enzyme assay and in vivo functional rescue test, multiple orthogonal methods\",\n      \"pmids\": [\"10648598\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Point mutations within two patches in the TAF1 N-terminal kinase domain (aa 1–414) decrease both autophosphorylation and trans-phosphorylation activities. TAF1 bearing these kinase domain mutations shows significantly reduced ability to rescue ts13 cells and impairs transcription from the cyclin A and cdc2 promoters in vivo.\",\n      \"method\": \"Site-directed mutagenesis of kinase domain, in vitro kinase assay, ts13 complementation, promoter-reporter transcription assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis with enzyme assay and in vivo functional rescue, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"9660973\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"TAF1 (TAFII250) specifically interacts with RAP74 subunit of TFIIF. In vivo complementation of temperature-sensitive TAFII250 cells shows that the RAP74 interaction is critical for cell viability. Binding interfaces between TAFII250 and RAP74 were mapped using in vitro binding assays.\",\n      \"method\": \"In vitro binding assays (GST pulldown, far-western), in vivo complementation of ts13 cells\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal binding assays with in vivo functional validation, two orthogonal approaches, single lab\",\n      \"pmids\": [\"7590250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Transcription of the cyclin A gene is directed by ATF family activators in a TAFII250-dependent manner. The cyclin A TSRE enhancer element confers TAFII250 dependence; chimeric promoter constructs demonstrate TAFII250 is required both for upstream activator function (ATF binding) and core promoter activity.\",\n      \"method\": \"Temperature-sensitive ts13 cell system, chimeric promoter analysis, transient transfection, microsequencing of purified TSRE-binding proteins\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis via ts13 mutant combined with chimeric promoter dissection and protein identification, single lab\",\n      \"pmids\": [\"9334328\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Rb (retinoblastoma protein) binds directly to hTAFII250 both in vitro and in vivo. This interaction is required for Rb-stimulated Sp1-mediated transcription, which is disrupted at the nonpermissive temperature in ts13 cells and restored by wild-type TAFII250.\",\n      \"method\": \"GST pulldown (in vitro binding), co-immunoprecipitation (in vivo), ts13 complementation with transcription assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal binding assays in vitro and in vivo with functional rescue, single lab\",\n      \"pmids\": [\"7724524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Rb inhibits the intrinsic bipartite kinase activity of TAFII250, including autophosphorylation and phosphorylation of RAP74. Inhibition requires the Rb pocket domain (aa 379–928) and specifically targets the N-terminal kinase domain through direct protein-protein interaction. Two tumor-derived Rb pocket mutants (C706F, Δex22) are defective for kinase inhibition despite retaining TAFII250 binding.\",\n      \"method\": \"In vitro kinase assay with immunopurified and recombinant TAFII250, Rb domain deletion analysis, tumor-derived mutant analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro enzyme inhibition assay with domain mapping and tumor mutant analysis, single lab\",\n      \"pmids\": [\"9858607\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"MDM2 C-terminal Ring finger domain binds TAFII250/CCG1, while its central acidic domain binds TBP. MDM2 binding to TAFII250 correlates with MDM2 activation of the cyclin A promoter but not c-fos. Deletion of the MDM2 C-terminal region abolishes activation.\",\n      \"method\": \"Co-immunoprecipitation from mammalian cells, GST pulldown in vitro, promoter-reporter transcription assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and in vitro binding with functional promoter assays, single lab\",\n      \"pmids\": [\"9388200\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"TAFII55 binds to the RAP74-binding domain of TAFII250 (aa 848-1279) and inhibits its acetyltransferase activity. Addition of recombinant TAFII55 to in vitro transcription assays inhibits TAFII250-dependent MHC class I transcription.\",\n      \"method\": \"Yeast two-hybrid screen, co-immunoprecipitation, in vitro HAT assay, in vitro transcription assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid plus in vitro enzyme inhibition plus functional transcription assay, single lab\",\n      \"pmids\": [\"11592977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TAF7 binding to TAF1 inhibits TAF1 HAT activity; TAF1-mediated phosphorylation of TAF7 at Ser-264 disrupts the TAF1/TAF7 interaction within TFIID, leading to activation of TAF1 HAT activity, increased histone H3 acetylation at cyclin D1 and cyclin A promoters, and stimulation of their transcription.\",\n      \"method\": \"Co-immunoprecipitation, HAT activity assay, site-directed mutagenesis (S264A and S264D phosphomutants), ChIP, siRNA knockdown, overexpression\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — phosphomutant analysis combined with HAT assay, ChIP, and functional transcription readout; multiple orthogonal methods, single lab\",\n      \"pmids\": [\"22711989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"c-Jun binds with high specificity to the N-terminal 163 amino acids of TAF1 (TAFII250). This same region represses TBP-DNA binding activity. c-Jun blocks TBP repression by the TAF1 N-terminus, derepressing TFIID-driven transcription in vitro, providing a mechanism for c-Jun-mediated transcriptional activation.\",\n      \"method\": \"In vitro binding assays, EMSA, in vitro transcription reconstitution, mapping with N-terminal domain fragments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding mapped by domain analysis plus functional reconstituted transcription assay, single lab\",\n      \"pmids\": [\"11316804\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The bZIP domain of c-Jun (basic leucine zipper) is necessary and sufficient for interaction with the N-terminus of hsTAF1, and the isolated bZIP domain can derepress TFIID-directed basal transcription in vitro. c-Fos alone does not interact with hsTAF1, but c-Fos/c-Jun heterodimers do bind.\",\n      \"method\": \"In vitro binding assay, in vitro transcription, domain mapping of c-Jun\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mapping with binding assay and functional transcription reconstitution, single lab\",\n      \"pmids\": [\"15087451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TAF1 directly binds Pax3 and mediates its monoubiquitination via TAF1's ubiquitin-activating/conjugating (E1/E2) activity. TAF1 overexpression increases monoubiquitinated Pax3 and its proteasomal degradation; TAF1 depletion reduces Pax3 monoubiquitination, increases Pax3 protein levels, and inhibits myogenic differentiation and myoblast migration.\",\n      \"method\": \"GST pulldown, co-immunoprecipitation, ubiquitination assay, TAF1 overexpression/knockdown, differentiation and migration assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — direct binding, in vitro ubiquitination assay, and functional cellular phenotype with gain/loss of function; multiple methods, single lab\",\n      \"pmids\": [\"21145483\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Cyclin D1 associates with TAFII250 (TAF1) N-terminal domain (aa 1–434) both in mammalian cells and in baculovirus-infected insect cells, and in vitro via GST pulldown. The N-terminus of cyclin D1 (aa 1–100) is sufficient for this interaction and for repressing Sp1-mediated transcription. Rb or CDK4 overexpression reduces the level of TAFII250-cyclin D1 complex.\",\n      \"method\": \"Co-immunoprecipitation, GST pulldown, promoter-reporter transcription assays, domain deletion analysis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP in multiple cell systems plus in vitro binding and functional transcription assay, single lab\",\n      \"pmids\": [\"9926939\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"TAFII250 stimulates Mdm2-dependent ubiquitylation and degradation of p53. Mechanistically, TAFII250 downregulates Mdm2 auto-ubiquitylation leading to Mdm2 stabilization, and promotes p53-Mdm2 association through the acidic domain of Mdm2. TAFII250 inactivation in ts13 cells leads to p53 induction and cell cycle arrest.\",\n      \"method\": \"Ubiquitylation assay, co-immunoprecipitation, ts13 temperature-shift experiments\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitylation assay plus binding assays plus genetic (ts13) model, single lab\",\n      \"pmids\": [\"17237821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Alternative pre-mRNA splicing of Drosophila TAF1 generates four mRNAs (TAF1-1 to TAF1-4). TAF1-2 and TAF1-4 encode proteins with AT-hook DNA-binding motifs. Ionizing-radiation-induced upregulation of TAF1-3 and TAF1-4 is mediated by ATM and CHK2; camptothecin-induced upregulation is mediated by ATR and CHK1, as demonstrated by pharmacological inhibitors and RNAi.\",\n      \"method\": \"RT-PCR, RNAi knockdown, pharmacological inhibitors of ATM/ATR/CHK1/CHK2, reporter assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi and pharmacological pathway dissection with specific isoform readout, single lab\",\n      \"pmids\": [\"17030624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Drosophila TAF1 isoforms TAF1-2 and TAF1-4 (bearing two AT-hook motifs, one alternatively spliced) directly bind DNA in the minor groove of AT-rich sequences with preference for AAT, independently of TAF2. Alanine-scanning mutagenesis of the AT-hook identifies essential Lys and Arg residues for DNA contact.\",\n      \"method\": \"EMSA, alanine-scanning mutagenesis, DNA binding competition assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — direct binding assay combined with mutagenesis establishing mechanism, single lab\",\n      \"pmids\": [\"16893881\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Among general TFIID subunits (TBP, TAF1, TAF4, TAF5, TAF9), only TAF1 colocalizes with the testis-specific tTAF Mia in spermatocyte nucleoli. Nucleolar localization of TAF1 is disrupted in tTAF mutant flies, suggesting stepwise assembly of a testis-specific TFIID complex where a TAF1 isoform (TAF1-2) is recruited to a tTAF core subassembly.\",\n      \"method\": \"Immunofluorescence microscopy in Drosophila testes, analysis of tTAF mutant flies\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct localization with genetic epistasis in mutant animals, single lab\",\n      \"pmids\": [\"17823958\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"TAF1 binds directly to the ribosomal DNA transcription activator UBF, colocalizes with UBF in the nucleolus of HeLa cells, and stimulates RNA polymerase I transcription in a dosage-dependent manner in cotransfection and in vitro transcription assays.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, confocal microscopy, cell fractionation, cotransfection reporter assay, in vitro transcription\",\n      \"journal\": \"Current biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods including in vitro transcription and localization, single lab\",\n      \"pmids\": [\"12498690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"TAF1 directly interacts with the androgen receptor (AR) N-terminus through its acetyltransferase and ubiquitin-activating/conjugating (E1/E2) domains. TAF1 and AR colocalize on the PSA promoter/enhancer. TAF1 overexpression enhances AR transcriptional activity and increases polyubiquitinated AR levels; TAF1 knockdown decreases AR transactivation.\",\n      \"method\": \"Yeast two-hybrid, GST pulldown, co-immunoprecipitation, ChIP, transactivation assays, siRNA knockdown\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (pulldown, Co-IP, ChIP, functional assay), single lab\",\n      \"pmids\": [\"20181722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Inactivation of TAF1 in ts13 cells activates an ATR-mediated DNA damage response: ATR rapidly localizes to subnuclear foci, and downstream targets including p53 and Chk1 are phosphorylated, resulting in G1 cell cycle arrest. Dominant negative ATR (but not dominant negative ATM) overrides the G1 arrest.\",\n      \"method\": \"Immunofluorescence, immunoblotting, caffeine inhibition, dominant negative ATR/ATM expression, ts13 temperature-shift\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pathway placement by dominant-negative epistasis plus pharmacological inhibition, single lab\",\n      \"pmids\": [\"15169897\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Human TFIID biogenesis occurs co-translationally, with all protein heterodimerization steps happening during protein synthesis. TAF1 acts as a flexible scaffold that drives co-translational recruitment of TFIID submodules preassembled in the cytoplasm, with the complex assembling onto the nascent TAF1 polypeptide in a hierarchical multistep manner.\",\n      \"method\": \"RNA immunoprecipitation (RIP), single-molecule imaging, proteomics, structure-function analysis\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal approaches (RIP, single-molecule imaging, proteomics) in single rigorous study establishing mechanism\",\n      \"pmids\": [\"37386215\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"TAF1 HAT activity is required for histone H3 acetylation at the cyclin D1 promoter (but not c-fos), facilitating transcription factor binding to Sp1 sites and activating cyclin D1 transcription and G1-to-S phase progression. HAT-deficient TAF1 mutants (Δ844-850, Δ848-850) cannot complement ts13 cell cycle arrest or cyclin D1 transcription. TSA treatment restores activity, indicating H3 acetylation mediates the effect.\",\n      \"method\": \"HAT domain mutagenesis, ChIP, in vivo genomic footprinting, ts13 complementation, trichostatin A treatment\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mutagenesis plus ChIP plus genomic footprinting plus functional rescue, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"15870300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TAF1 zinc knuckle domain in the C-terminal half is a second DNA-binding module that aids recruitment of TFIID to endogenous promoters. Mutations in the zinc knuckle with defects in DNA binding compromise TFIID promoter occupancy, decrease transcription, and reduce cell viability.\",\n      \"method\": \"Domain identification and mutagenesis, DNA binding assays, ChIP, cell viability assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis with DNA binding assay and ChIP functional readout, single lab\",\n      \"pmids\": [\"29545534\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TAF1 associates with K43-acetylated AML1-ETO (AE) fusion protein; ChIP-seq shows significant overlap of TAF1 and AE binding sites. TAF1 knockdown alters AE association with chromatin and affects expression of AE-regulated genes. TAF1 is required for leukemic cell self-renewal; its reduction promotes differentiation and apoptosis of AE+ AML cells.\",\n      \"method\": \"Co-immunoprecipitation, ChIP-seq, shRNA knockdown, gene expression analysis, differentiation/apoptosis assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus genome-wide ChIP-seq plus functional cellular assays, single lab\",\n      \"pmids\": [\"31664040\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SRRM4/nSR100 splicing factor promotes inclusion of the neuronal microexon 34' into TAF1 mRNA through recognition of UGC sequences in the polypyrimidine tract upstream of the microexon. Knockdown and ectopic expression of SRRM4 in cells directly regulate microexon 34' inclusion, generating a neuronal-specific TAF1 isoform.\",\n      \"method\": \"RNAi knockdown, ectopic expression, isoform-specific RT-PCR and antibodies, mutagenesis of splicing elements\",\n      \"journal\": \"RNA biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional manipulation (knockdown and overexpression) with RNA splicing readout and identification of regulatory sequence elements, single lab\",\n      \"pmids\": [\"31559909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Human TAF1L (a retroposed TAF1 homolog expressed specifically in testis) can bind TBP and functionally substitute for TAF1 by rescuing the temperature-sensitive lethality of TAFII250-mutant hamster cells. TAF1L lacks introns and arose by retroposition of a processed TAF1 mRNA.\",\n      \"method\": \"TBP binding assay, ts13 complementation assay, expression analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding assay plus functional complementation rescue, single lab\",\n      \"pmids\": [\"12217962\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"NMR and mutagenesis of yeast TAF1 TAND1 (residues 10–37) and TAND2 (residues 46–71) showed that TAND1 (two alpha-helices) interacts with the concave DNA-binding surface of TBP, while TAND2 (mini beta-sheet) interacts with the convex TBP alpha-helix 2. The minimal region for GAL4-dependent transcriptional activation corresponds to the first TAND1 helix.\",\n      \"method\": \"NMR structure determination, mutagenesis, yeast genetic assay, in vitro binding\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structural data with mutagenesis and in vivo functional assay, single rigorous study\",\n      \"pmids\": [\"15165843\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The cytoplasmic domain of Xenopus NF-protocadherin (NFPC) binds TAF1/SET (a histone-associated protein). NFPC and TAF1 co-precipitate from embryo extracts; TAF1 rescues ectodermal disruptions caused by dominant-negative NFPC. Antisense morpholino knockdown of either NFPC or TAF1 produces identical ectodermal defects.\",\n      \"method\": \"Co-immunoprecipitation from Xenopus embryos, rescue experiment, antisense morpholino knockdown\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional rescue plus parallel morpholino knockdown phenotypes, single lab\",\n      \"pmids\": [\"12636922\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"High-density gene profiling in ts13 cells revealed that at least 18% of genes are differentially expressed at the restrictive temperature (TAF1 acetyltransferase inactivation). Approximately 6% of genes require a functional TAF1 N-terminal kinase domain, and only ~1% of those also require TAF1 acetyltransferase activity, indicating the two enzymatic activities regulate largely non-overlapping gene sets.\",\n      \"method\": \"Microarray gene profiling in ts13 cells with N-terminal kinase domain mutants vs. acetyltransferase domain mutants\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide analysis with two distinct domain mutants distinguishing non-overlapping gene sets, single lab\",\n      \"pmids\": [\"10716982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Cyclin D1 suppresses Rb-mediated inhibition of TAFII250 kinase activity: when cyclin D1 is coincubated with Rb and TAFII250, Rb's ability to inhibit TAFII250 kinase is blocked. Cyclin D1 acts through its association with TAFII250 (not Rb). The related protein p107 can also inhibit TAFII250 kinase, an effect likewise alleviated by cyclin D1.\",\n      \"method\": \"In vitro kinase assay with purified proteins, co-immunoprecipitation\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Weak — in vitro enzyme assay with reconstituted three-protein system, single lab, single study\",\n      \"pmids\": [\"11126356\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"TAF1 TAF-N terminal domain (TAND1) undergoes induced folding from a largely unstructured to globular state upon binding TBP, occupying TBP's DNA-binding surface and inhibiting TBP-DNA interaction (previously established in Drosophila). In yeast, TAND1 first helix and TAND2 beta-sheet mediate the concave and convex TBP surface interactions respectively.\",\n      \"method\": \"NMR spectroscopy, mutagenesis, in vitro binding assays, yeast genetic assays\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structural analysis with mutagenesis and functional assays, single rigorous study\",\n      \"pmids\": [\"15165843\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TAF1 is the largest subunit of the general transcription factor TFIID, functioning as a multi-enzymatic scaffold that: (1) binds TBP (via TAND1/TAND2 domains) and multiple TAF subunits to nucleate TFIID assembly co-translationally; (2) contacts core promoter DNA via a winged-helix domain, a zinc knuckle, and (in Drosophila) AT-hook motifs; (3) possesses histone acetyltransferase activity (acetylating H3/H4) required for chromatin remodeling at specific promoters such as cyclin D1; (4) acts as a bipartite serine kinase that phosphorylates RAP74/TFIIF and TAF7 (releasing its inhibitory effect on TAF1 HAT activity) and phosphorylates p53 at Thr-55 to promote p53 degradation and cell cycle progression; (5) possesses ubiquitin E1/E2-like activity that monoubiquitinates Pax3 targeting it for proteasomal degradation; and (6) mediates interactions with diverse regulators including Rb (which inhibits TAF1 kinase), cyclin D1, MDM2, c-Jun, and oncogenic fusion proteins such as AML1-ETO, thereby coupling transcriptional regulation to cell cycle control, DNA damage responses, and development.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TAF1 is the largest subunit of the general transcription factor TFIID, functioning as a multi-enzymatic scaffold that nucleates TFIID assembly, contacts core-promoter DNA, and couples transcriptional regulation to cell cycle control and DNA damage responses [#1, #29]. As the assembly platform, TAF1 binds TBP directly through its N-terminal TAND1/TAND2 domains, which fold upon binding and occupy distinct concave and convex TBP surfaces to regulate TBP-DNA interaction [#1, #6, #35], and it drives co-translational, hierarchical recruitment of preassembled TFIID submodules onto the nascent TAF1 polypeptide [#29]. TAF1 engages core-promoter DNA through multiple modules including a winged-helix domain mounted on the TAF1-TAF7 heterodimeric core, a C-terminal zinc knuckle, and sequence-specific contacts to downstream promoter elements, all of which support TFIID promoter occupancy and transcription [#5, #7, #31]. TAF1 carries intrinsic histone acetyltransferase activity acetylating H3/H4 that is required for cell cycle progression and for H3 acetylation at the cyclin D1 promoter to enable Sp1-dependent activation and G1-to-S transition [#0, #9, #30]; this HAT activity is held in check by the bound TAF7 subunit until TAF1-mediated phosphorylation of TAF7 at Ser-264 releases the inhibition [#17]. TAF1 is also a bipartite serine kinase whose two domains cooperate to phosphorylate the TFIIF subunit RAP74 and to phosphorylate p53 at Thr-55, promoting MDM2-dependent p53 degradation, p53 dissociation from promoters, and G1 progression; this kinase activity is sensed via cellular ATP levels and inhibited by retinoblastoma protein [#2, #3, #4, #14, #22]. Beyond TFIID, TAF1 monoubiquitinates Pax3 through its ubiquitin E1/E2-like activity to control myogenic differentiation [#20], and integrates signals from regulators including Rb, cyclin D1, MDM2, c-Jun, and the oncogenic AML1-ETO fusion to direct gene-specific transcriptional programs [#13, #21, #18, #32]. Distinct gene sets depend on the kinase versus acetyltransferase activities, indicating its enzymatic functions regulate largely non-overlapping targets [#37].\",\n  \"teleology\": [\n    {\n      \"year\": 1993,\n      \"claim\": \"Established TAF1 as the scaffolding anchor of TFIID by demonstrating it binds TBP directly and supports complex assembly, defining its core architectural role.\",\n      \"evidence\": \"Recombinant binding assays in vitro and in yeast, co-immunoprecipitation\",\n      \"pmids\": [\"7680771\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the structural basis of TBP contact\", \"Did not address how other TAFs are recruited\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Revealed that TAF1 is itself an enzyme, possessing intrinsic histone acetyltransferase activity, reframing TFIID from a passive factor to a chromatin-modifying machine.\",\n      \"evidence\": \"In vitro HAT assay with recombinant protein and histone substrates, domain mapping across human/Drosophila/yeast homologs\",\n      \"pmids\": [\"8980232\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vitro substrate use did not establish the in vivo target genes\", \"Did not address regulation of HAT activity\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Identified a second enzymatic activity — a bipartite serine kinase phosphorylating RAP74/TFIIF — showing TAF1 transmits signals to the basal machinery.\",\n      \"evidence\": \"In vitro kinase assay with purified recombinant TAF1 and RAP74, deletion analysis of two kinase domains\",\n      \"pmids\": [\"8625415\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo substrate repertoire unresolved\", \"Functional consequence of RAP74 phosphorylation not defined\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Connected TAF1 enzymatic and binding functions to cell physiology by showing RAP74 interaction and Rb binding are critical for viability and Sp1-mediated transcription via the ts13 system.\",\n      \"evidence\": \"GST pulldown, far-western, co-immunoprecipitation, ts13 complementation with transcription assays\",\n      \"pmids\": [\"7590250\", \"7724524\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking Rb binding to transcription not fully defined\", \"Did not separate scaffolding from enzymatic contributions\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Genetically separated TAF1's two enzymatic activities, showing catalytic HAT residues are required for cell cycle progression and that kinase versus HAT domains regulate largely non-overlapping gene sets.\",\n      \"evidence\": \"Acetyl-CoA site and kinase-domain mutagenesis, ts13 complementation, transcription assays, genome-wide microarray profiling\",\n      \"pmids\": [\"10648598\", \"10716982\", \"9660973\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct in vivo histone substrates at most genes not mapped\", \"Promoter-specific selectivity mechanism unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Placed TAF1 kinase activity at the heart of cell cycle and DNA damage control by identifying p53 Thr-55 as a substrate whose phosphorylation drives p53 degradation and G1 progression, and showing TAF1 inactivation triggers an ATR-mediated arrest.\",\n      \"evidence\": \"In vivo phosphorylation, T55A mutagenesis, RNAi, kinase inhibition, dominant-negative ATR/ATM in ts13 cells\",\n      \"pmids\": [\"15053879\", \"15169897\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How TAF1 kinase activity is timed during the cycle not fully resolved\", \"Relationship between TFIID assembly and ATR signaling unclear\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Linked HAT activity to a specific promoter program by showing TAF1-dependent H3 acetylation at the cyclin D1 promoter enables Sp1 binding and G1-to-S progression.\",\n      \"evidence\": \"HAT-domain mutagenesis, ChIP, in vivo genomic footprinting, ts13 complementation, TSA treatment\",\n      \"pmids\": [\"15870300\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide scope of HAT-dependent acetylation not defined here\", \"Selectivity for cyclin D1 over c-fos unexplained\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrated TAF1 makes direct, sequence-specific contact with downstream core-promoter DNA, extending its role to promoter recognition beyond TBP.\",\n      \"evidence\": \"UV photo-cross-linking, promoter mutagenesis, in vitro transcription on the beta-globin DCE\",\n      \"pmids\": [\"16227614\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-promoter scope\", \"Did not identify the responsible DNA-binding subdomain\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Uncovered a third enzymatic activity, ubiquitin E1/E2-like activity, showing TAF1 monoubiquitinates Pax3 to control its degradation and myogenic differentiation.\",\n      \"evidence\": \"GST pulldown, co-IP, ubiquitination assay, gain/loss-of-function with differentiation and migration assays\",\n      \"pmids\": [\"21145483\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of E1/E2 activity not defined\", \"Other ubiquitination substrates unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Resolved how TAF1 HAT activity is regulated, showing TAF1 phosphorylation of TAF7 at Ser-264 disrupts an inhibitory TAF1-TAF7 contact to activate acetylation at cyclin promoters.\",\n      \"evidence\": \"Co-IP, HAT assay, S264A/S264D phosphomutants, ChIP, siRNA\",\n      \"pmids\": [\"22711989\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trigger for TAF7 phosphorylation in vivo not defined\", \"Generality across promoters not established\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Provided structural mechanism for promoter DNA contact and epigenetic reading, resolving the TAF1-TAF7 core with a DNA-binding winged-helix domain and a pocket recognizing modified histone H3.\",\n      \"evidence\": \"X-ray crystallography of human and yeast TAF1-TAF7, DNA-binding assays, histone peptide binding, ts13 complementation\",\n      \"pmids\": [\"25412659\", \"24927529\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo role of the H3K27me3-reading pocket not validated\", \"Coordination with other DNA-binding modules unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified the C-terminal zinc knuckle as a second DNA-binding module required for TFIID promoter occupancy, transcription, and cell viability.\",\n      \"evidence\": \"Domain mutagenesis, DNA-binding assays, ChIP, viability assays\",\n      \"pmids\": [\"29545534\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How multiple DNA modules cooperate not defined\", \"Genome-wide promoter dependency not mapped\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Extended TAF1's role to leukemic gene regulation by showing it associates with acetylated AML1-ETO and is required for leukemic self-renewal.\",\n      \"evidence\": \"Co-IP, ChIP-seq, shRNA knockdown, differentiation/apoptosis assays in AE+ AML cells\",\n      \"pmids\": [\"31664040\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether TAF1 enzymatic activities mediate the effect unknown\", \"Direct versus TFIID-mediated recruitment unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined how TFIID is built, showing TAF1 acts as a flexible scaffold driving co-translational, hierarchical assembly of preformed submodules onto the nascent polypeptide.\",\n      \"evidence\": \"RNA immunoprecipitation, single-molecule imaging, proteomics, structure-function analysis\",\n      \"pmids\": [\"37386215\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How assembly couples to nuclear import not defined\", \"Quality control of misassembled complexes unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TAF1's three distinct enzymatic activities (HAT, kinase, ubiquitin) are coordinated within a single TFIID scaffold and selectively deployed at specific promoters in vivo remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No integrated model linking enzymatic switching to gene selectivity\", \"Physiological triggers governing each activity in cells not defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 9, 30, 2, 3, 17, 20]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [2, 3, 17]},\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [20, 27]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [5, 7, 31, 24]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 29, 12, 30]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 29]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 29]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [25, 26]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [29]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 29, 30, 12]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [3, 4, 9, 30, 28]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [0, 30, 17]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [4, 28]}\n    ],\n    \"complexes\": [\"TFIID\"],\n    \"partners\": [\"TBP\", \"TAF7\", \"RAP74\", \"RB1\", \"MDM2\", \"CCND1\", \"JUN\", \"UBF\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}