{"gene":"CDK7","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":1994,"finding":"CDK7 (MO15) is the catalytic subunit of the CDK-activating kinase (CAK), which complexes with cyclin H (37 kDa) to form a functional kinase. Reconstitution of CAK in vitro with MO15 and cyclin H demonstrated that MO15 is a cyclin-dependent kinase (CDK7). A conserved threonine in CDK7 is required for full CAK activity; mutation of this residue severely reduces activity. CAK phosphorylates and activates CDK2/cyclin and CDC2/cyclin complexes.","method":"Protein purification from mammalian cells, protein sequencing, cDNA cloning, in vitro reconstitution, site-directed mutagenesis","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with mutagenesis, foundational study replicated across multiple labs","pmids":["8069918"],"is_preprint":false},{"year":1993,"finding":"MO15 (CDK7) is the catalytic subunit of a CAK that activates cdc2, cdk2, and divergent cdc2-like proteins through phosphorylation of Thr161 (or its homologues) in the T-loop. Immunodepletion of MO15 from Xenopus egg extracts depletes CAK activity, which is recovered in immunoprecipitates, establishing MO15 as the catalytic subunit of CAK in vivo.","method":"Protein purification from starfish oocytes, microsequencing, immunodepletion from Xenopus egg extracts, immunoprecipitation kinase assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — biochemical purification, immunodepletion with functional recovery, replicated across organisms","pmids":["8344251"],"is_preprint":false},{"year":1994,"finding":"CDK7 (MO15) is associated with the TFIIH transcription-DNA repair factor and phosphorylates the C-terminal domain (CTD) of RNA polymerase II. CDK7 is important for nucleotide excision repair through its association with TFIIH, linking cell cycle regulation, transcription, and DNA repair.","method":"In vivo and in vitro repair assays, biochemical association studies","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — functional in vitro and in vivo repair assays, association demonstrated, replicated by multiple labs","pmids":["8001135"],"is_preprint":false},{"year":1994,"finding":"Cyclin H is a MO15 (CDK7)-associated protein identified by yeast two-hybrid screen and confirmed as a major MO15 partner in vivo; cyclin H binding enhances MO15 kinase activity towards Cdk2/cyclin A, demonstrating that a cyclin/kinase complex can regulate other cyclin/kinase complexes.","method":"Yeast two-hybrid screen, co-immunoprecipitation, in vitro kinase assay","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — yeast two-hybrid with in vivo co-IP validation and kinase assay, replicated by concurrent studies","pmids":["8078587"],"is_preprint":false},{"year":1994,"finding":"Mouse CDK7 (p39MO15) assembles with cyclin H to generate a CAK activity capable of phosphorylating and activating both CDK2 and CDK4 in complexes with their respective cyclins (cyclin A and cyclin D). Antisera against p39MO15 completely depletes mammalian cell lysates of CAK activity for both substrates. CAK activity is present in quiescent and cycling cells and is invariant throughout the cell cycle.","method":"In vitro reconstitution with insect and mammalian cell proteins, immune complex CAK assay, immunodepletion","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — reconstitution, immunodepletion, kinase assays across cell cycle stages","pmids":["7935441"],"is_preprint":false},{"year":1996,"finding":"MAT1, cyclin H, and CDK7 form a ternary kinase complex (CAK) that exists either free or associated with TFIIH. MAT1 is strongly associated with CDK7 and cyclin H and stimulates the kinase activity of the complex, though it is not strictly required for complex formation or basal activity. The kinase activity of TFIIH-associated CDK7 is reduced after UV light irradiation.","method":"Biochemical fractionation, co-immunoprecipitation, in vitro kinase assay, UV irradiation","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, kinase assay, multiple conditions tested; replicated by concurrent studies","pmids":["8617234"],"is_preprint":false},{"year":1997,"finding":"MAT1 is required for efficient phosphorylation of p53 by CDK7-cyclin H at Ser33 in vitro, while CDK7-cyclin H alone is sufficient to phosphorylate CDK2. MAT1 acts as a substrate specificity-determining factor for CDK7-cyclin H. p53 is phosphorylated at Ser33 in vivo. p36MAT1 and p53 interact both in vitro and in vivo.","method":"In vitro phosphorylation assays, site-directed mutagenesis, in vivo phosphorylation, co-immunoprecipitation, pulldown","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro reconstitution, mutagenesis of phosphorylation site, in vivo validation, reciprocal interaction","pmids":["9372954"],"is_preprint":false},{"year":1997,"finding":"Addition of MAT1 to recombinant bipartite CDK7-cyclin H switches its substrate preference to favour the RNA pol II CTD over CDK2. TFIIH-associated CDK7 has a strong preference for CTD over CDK2, and acquires specificity for TFIIE and TFIIF not recognized by free CAK. Thus both MAT1 and core TFIIH context govern CDK7 substrate specificity.","method":"In vitro kinase assays with recombinant proteins, comparison of free CAK vs. TFIIH-associated kinase, substrate competition assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro systems with multiple substrates, multiple CDK7 complex forms compared","pmids":["9130709"],"is_preprint":false},{"year":1998,"finding":"Drosophila cdk7 is necessary for CAK activity in vivo in a multicellular organism, as demonstrated by null and temperature-sensitive mutations. cdk7 activity is required for activation of both Cdc2/Cyclin A and Cdc2/Cyclin B complexes, and for cell division, establishing cdk7 as the genuine CAK in metazoans.","method":"Genetic: null and temperature-sensitive alleles, in vivo CAK activity assay, genetic complementation","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic loss-of-function with specific molecular and cellular phenotypes, model organism","pmids":["9450931"],"is_preprint":false},{"year":1998,"finding":"CDK7/cyclin H kinase activity within TFIIH is inhibited concomitantly with transcriptional repression at mitosis. cdc2/cyclin B phosphorylates p62 and p36 subunits of TFIIH in vitro, and CDK7/cyclin H-mediated CTD phosphorylation is inhibited when cells enter mitosis. This inhibition can be reversed by p21Waf1/Cip1/Sdi1.","method":"In vitro transcription with nuclear extracts, mitotic kinase assays, protein phosphorylation labeling, inhibitor rescue experiments","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — multiple biochemical methods in one study, in vitro and cell-based assays","pmids":["9488463"],"is_preprint":false},{"year":1999,"finding":"Cyclin H/CDK7/p36 and cyclin C/CDK8 are biochemically distinct CTD kinases that phosphorylate distinct residues in recombinant CTD substrates and differentially phosphorylate endogenous RNA polymerase II in vivo, suggesting unique roles in transcriptional regulation.","method":"In vitro kinase assays with recombinant and endogenous substrates, site-specific phosphorylation mapping, small-molecule inhibitor profiling","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro and in vivo phosphorylation comparison, single lab with multiple substrates","pmids":["10023686"],"is_preprint":false},{"year":2001,"finding":"T-loop phosphorylation of CDK7 (at Ser164 or Thr170) cooperates with MAT1 binding to stabilize the CDK7-cyclin H-MAT1 complex in vivo. Phosphorylation of Thr170 greatly stimulates CTD kinase activity without significantly affecting CDK2 substrate activity, due to accelerated enzyme turnover (increased kcat). This substrate-specific regulation could augment CTD phosphorylation by TFIIH-associated CDK7.","method":"Drosophila genetics (temperature-sensitive and phosphosite mutants), co-immunoprecipitation, in vitro kinase assay with enzyme kinetics","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — genetic and biochemical orthogonal methods, mechanistic kinetic analysis","pmids":["11447116"],"is_preprint":false},{"year":2000,"finding":"The C-terminus of MAT1 binds to the CDK7-cyclin H complex and activates CDK7 kinase activity. The median coiled-coil region of MAT1 anchors CAK to the TFIIH core through interactions with XPD and XPB helicases. The N-terminal RING finger domain of MAT1 is crucial for transcription activation and for CTD phosphorylation by TFIIH.","method":"Recombinant TFIIH reconstitution, deletion mutagenesis of MAT1, in vitro kinase and transcription assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstituted complexes, domain mapping by mutagenesis, functional transcription assays","pmids":["10801852"],"is_preprint":false},{"year":2000,"finding":"CDK7 interacts with the histidine triad protein Hint/PKCI-1. This interaction is independent of cyclin H binding or CDK7 kinase activity and is conserved between CDK7/Hint and the yeast Kin28/Hnt1. Overexpression of CDK7 causes partial relocalization of Hint to the nucleus. Genetic interaction between KIN28 and HNT1 in yeast leads to elongated cell morphology and reduced colony formation.","method":"Yeast two-hybrid, co-immunoprecipitation, subcellular localization by microscopy, yeast genetics (double mutant)","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — yeast two-hybrid confirmed by co-IP and localization; genetic interaction in yeast","pmids":["10958787"],"is_preprint":false},{"year":2004,"finding":"The crystal structure of human CDK7 in complex with ATP was determined at 3 Å resolution. The kinase is in an inactive conformation similar to inactive CDK2. The activation segment is phosphorylated at Thr170 and is in a defined conformation differing from phospho-CDK2. CDK7 is not a substrate for kinase-associated phosphatase.","method":"X-ray crystallography, in vitro kinase assays","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with functional validation in one study","pmids":["15530371"],"is_preprint":false},{"year":2007,"finding":"Mutagenesis studies identified regions in CDK2 responsible for its recognition by CDK7. CDK7 and CDK2 interact in a quasi-symmetric head-to-tail arrangement where the N-terminal lobe of one kinase docks against the C-terminal lobe of the other. Cyclin A hydrophobic pocket is not a recruitment site for CDK7. CDK1 and CDK2 can phosphorylate CDK7, but CDK7 cannot autophosphorylate.","method":"Site-directed mutagenesis of CDK2, in vitro kinase assays, structural modeling","journal":"Proteins","confidence":"Medium","confidence_rationale":"Tier 1-3 / Moderate — mutagenesis with kinase assays, structural model but not crystal structure, single lab","pmids":["17373709"],"is_preprint":false},{"year":1997,"finding":"CDK7, cyclin H, and MAT1 within the CAK complex are localized to coiled bodies (subnuclear structures enriched in snRNPs) in vivo. Cyclin H localization to coiled bodies is predominantly detected during G1 and S phases, with decreased detection in G2. CDK7 and cyclin H do not colocalize with P80 coilin after coiled body disruption, indicating specific targeting to the snRNP-containing domain.","method":"Immunofluorescence microscopy, cell cycle synchronization","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct localization by immunofluorescence, cell cycle-dependent pattern, single lab","pmids":["9243502"],"is_preprint":false},{"year":1997,"finding":"CDK7 immunodepletion from cycling Xenopus egg extracts suppresses CAK activity and arrests extracts before M-phase. Translation of mRNAs encoding Xenopus CDK7 and its associated subunits restores CAK activity in CDK7-immunodepleted extracts, demonstrating that the CDK7 complex is necessary and sufficient for CDK activation in cycling vertebrate extracts.","method":"Immunodepletion from Xenopus egg extracts, mRNA injection, in vitro CAK activity assay","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — immunodepletion with functional rescue by specific mRNAs in cell-free system","pmids":["9315098"],"is_preprint":false},{"year":2013,"finding":"CDK7 is a CDK4- and CDK6-activating kinase in human cells, required to maintain their activity continuously (not just to establish the active state, unlike CDK1/CDK2). Activating phosphorylation of CDK7 rises concurrently with CDK4 phosphorylation as cells exit quiescence, and CDK7 accelerates CDK4 activation in vitro. This reveals a CDK-activation cascade during G1 driven by mitogen signaling.","method":"Chemical genetics (analog-sensitive CDK7), in vitro kinase assay, cell synchronization and phosphorylation analysis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — chemical genetics with in vitro reconstitution, cell-based validation, mechanistic ordering established","pmids":["23622515"],"is_preprint":false},{"year":2015,"finding":"CDK7 inhibition (by THZ1) causes defects in RNA pol II CTD phosphorylation, co-transcriptional capping, promoter-proximal pausing, and productive elongation in vitro. CDK7 does not affect initiation but blocks essentially all CTD phosphorylation. THZ1 impacts pausing through a capping-independent block of DSIF and NELF loading; P-TEFb-dependent transition to elongation is also inhibited, likely due to loss of DSIF.","method":"In vitro transcription with nuclear extract, CDK7 inhibitor THZ1, RNA pol II phosphorylation assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro transcription reconstitution with mechanistic dissection at multiple steps","pmids":["26257281"],"is_preprint":false},{"year":2017,"finding":"CDK7 inhibition in analog-sensitive cells reduces capping enzyme recruitment, increases RNA pol II promoter-proximal pausing, and causes defective termination at gene 3' ends. CDK7 regulates H3K4me3 spreading at gene 5' ends and H3K36me3 positioning via a CTD code: capping enzymes and H3K4 methyltransferases SETD1A/B selectively bind TFIIH-phosphorylated CTD and TFIIH-phosphorylated CTD stimulates SETD1A/B activity toward nucleosomes.","method":"CDK7 analog-sensitive cell system, ChIP-seq, mass spectrometry, in vitro nucleosome methylation assay","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — analog-sensitive system plus in vitro activity assay plus MS, multiple orthogonal methods","pmids":["28768201"],"is_preprint":false},{"year":2019,"finding":"CDK7 phosphorylates MED1 at T1457 in a CDK7-dependent manner; phosphorylated MED1 physically engages androgen receptor (AR) at super-enhancer sites and is essential for AR-mediated transcription. CDK7 inhibition (THZ1) blocks AR/MED1 co-recruitment genome-wide and reverses the hyperphosphorylated MED1-associated enzalutamide-resistant phenotype.","method":"ChIP-seq, phosphoproteomic analysis, co-immunoprecipitation, CDK7 inhibitor treatment, CRPC xenograft model","journal":"Cancer discovery","confidence":"High","confidence_rationale":"Tier 2 / Strong — site-specific phosphorylation identified, genome-wide chromatin binding assay, functional rescue, in vivo validation","pmids":["31466944"],"is_preprint":false},{"year":2019,"finding":"A selective covalent CDK7 inhibitor (YKL-5-124) causes arrest at the G1/S transition and inhibition of E2F-driven gene expression, rescued by a CDK7 mutant unable to covalently engage YKL-5-124, demonstrating on-target specificity. Unlike THZ1, YKL-5-124 did not change RNA pol II CTD phosphorylation, revealing that CDK12/13 (THZ1 off-targets) contribute to CTD phosphorylation effects previously attributed to CDK7.","method":"Covalent chemical inhibitor with on-target rescue mutant, cell cycle analysis, gene expression profiling, comparison with selective CDK12/13 inhibitor","journal":"Cell chemical biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — allele-specific rescue controls, combination with selective CDK12/13 inhibitor for pathway dissection","pmids":["30905681"],"is_preprint":false},{"year":2010,"finding":"Xpd regulates the subcellular localization of CDK7/CAK and local mitotic kinase activity. Loss of Xpd causes changes in the dynamics of CDK7 distribution to different subcellular compartments, resulting in defects in mitotic spindle dynamics, failure to segregate chromosomes, and chromosomal instability in Drosophila embryos.","method":"Drosophila genetics (xpd mutants), immunofluorescence microscopy for CDK7 localization, mitotic kinase activity assays","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic loss-of-function with direct localization and kinase activity measurements","pmids":["20300654"],"is_preprint":false},{"year":2020,"finding":"CDK7 directly activates transcription-associated kinases CDK9, CDK12, and CDK13 (master regulator role). TFIIH restricts CDK7 kinase function to the RNAPII CTD, whereas other substrates (e.g., SPT5, SF3B1) are phosphorylated by the free trimeric CAK (CDK7/CCNH/MAT1). CAK dissociation from TFIIH is essential for broader CDK7 kinase activation. CDK7 also phosphorylates splicing factors SF3B1 and U2AF2, causing widespread splicing defects.","method":"Selective CDK7 inhibitor SY-351, quantitative phosphoproteomics, in vitro kinase assays, RNA-seq for splicing analysis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — phosphoproteomics with selective inhibitor, biochemical validation, multiple orthogonal methods","pmids":["33060135"],"is_preprint":false},{"year":2020,"finding":"The crystal structure of the CAK complex (CDK7/Cyclin H/MAT1) was solved at 2.6 Å resolution using Chaetomium thermophilum. The structure reveals an intricate network of interactions between CDK7 and its two binding partners. In vitro activity measurements and functional mutagenesis show that CDK7 activation can occur independent of T-loop phosphorylation and is exclusively MAT1-dependent by positioning the CDK7 T-loop in its active conformation.","method":"X-ray crystallography, in vitro kinase assays, site-directed mutagenesis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with functional mutagenesis and kinase assays in one study","pmids":["33055219"],"is_preprint":false},{"year":2024,"finding":"The crystal structure of the human CDK7/Cyclin H/MAT1 complex with dual T-loop phosphorylations (pS164 and pT170) was solved. pT170 coordinates conserved basic residues, while pS164 nucleates a unique arginine network involving all three subunits. CAK function (CDK activation) is unaffected by T-loop phosphorylation, whereas activity towards non-CDK substrates (CTD, SPT5) is increased several-fold by T170. Dual phosphorylation stimulates multisite phosphorylation of RNAPII CTD and SPT5. In human cells, CDK7 activation is a two-step process: S164 phosphorylation precedes and may prime T170 phosphorylation.","method":"X-ray crystallography, in vitro kinase assays with T-loop phosphomutants, cell-based phosphorylation analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with mutagenesis and in vitro kinase assays plus cell-based validation in one study","pmids":["39097586"],"is_preprint":false},{"year":2019,"finding":"Spironolactone-induced proteasomal degradation of XPB requires CDK7 kinase activity. CDK7 likely phosphorylates XPB at Ser90, which promotes recognition and polyubiquitination by SCFFBXL18 E3 ligase for proteasomal degradation.","method":"siRNA library screen, Western blotting, CDK7 kinase inhibition, site-directed mutagenesis of XPB Ser90","journal":"Genes to cells","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — siRNA screen with mutagenesis confirmation, mechanistic model proposed with supporting but not fully reconstituted evidence","pmids":["30762924"],"is_preprint":false},{"year":2003,"finding":"CDK7 (complexed with cyclin H and Mat1) functions as a CDK5-activating kinase in brain by phosphorylating CDK5 at Ser159, enhancing CDK5/p25 activity. CDK7 or cyclin H immunoprecipitates from mouse brain specifically phosphorylate CDK5 at Ser159; blocked CDK7 immunoprecipitate does not phosphorylate CDK5.","method":"Partial purification of brain enzyme, peptide phosphorylation assay, immunoprecipitation kinase assay from mouse brain, mutagenesis (Ser159Ala)","journal":"Cellular physiology and biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — immunoprecipitation kinase assay with mutagenesis, single lab, not fully reconstituted","pmids":["14586172"],"is_preprint":false},{"year":2000,"finding":"p16(INK4A) inhibits CDK7-mediated CTD kinase activity (in addition to CDK4-pRb kinase). The ability of p16(INK4A) to inhibit CDK7-CTD kinase contributes to its capacity to induce cell cycle arrest, representing an alternative pathway for p16-mediated cell cycle regulation.","method":"In vitro CTD kinase assay with p16, cell-based G1 arrest experiments","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro kinase assay with functional cell cycle readout, single lab","pmids":["11003668"],"is_preprint":false},{"year":2016,"finding":"CDK7 interacts functionally with MSL1, a component of the Drosophila dosage compensation complex. MSL1 depletion leads to decreased phosphorylation of Ser5 of RNA polymerase II CTD. Genetic and biochemical analyses reveal a functional interaction between MSL1 and CDK7.","method":"Genetic interaction analysis, biochemical co-precipitation, in vivo CTD phosphorylation measurement, transgenic flies with phosphomutants","journal":"Nature structural & molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic and biochemical in one study, functional phosphorylation readout, single lab","pmids":["27183194"],"is_preprint":false},{"year":2024,"finding":"CDK7 kinase activity promotes RNA pol II escape from promoters by facilitating release of initiation factors and Mediator from RNA pol II. CDK7 inhibition causes RNA pol II retention at promoters, decreased initiation, and immediate global downregulation of transcript synthesis, while elongation and termination are not directly affected. RNA pol II can proceed into gene bodies without pausing while retaining initiation factors, which are released further downstream when CDK7-independent phosphorylation occurs.","method":"Rapid CDK7 kinase inhibition combined with multi-omics (TT-seq, ChIP-seq, etc.) in human cells","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — rapid inhibition kinetics with multi-omic analysis to distinguish direct from indirect effects, mechanistic model at each step","pmids":["38821049"],"is_preprint":false},{"year":2011,"finding":"CDK7 and CCNH (cyclin H) are required for meiotic progression of porcine oocytes. Overexpression of CDK7 or CCNH accelerates meiotic resumption, Thr161 phosphorylation of CDC2, cyclin B synthesis, and MPF activation; knockdown of CDK7 or CCNH inhibits these meiotic events. MNAT1 overexpression or knockdown had no influence on meiotic resumption.","method":"Overexpression and RNA knockdown (antisense RNA injection) in porcine oocytes, kinase activity assay, immunofluorescence","journal":"Biology of reproduction","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain and loss of function with specific molecular and cellular phenotypes, single lab","pmids":["21778139"],"is_preprint":false},{"year":2011,"finding":"PKC-ι directly associates with and phosphorylates CDK7 at T170 in a cell cycle-dependent manner in glioblastoma cells, leading to downstream CDK2 phosphorylation at T160 and G1-S progression. PKC-ι downregulation reduces CDK7 and CDK2 phosphorylation.","method":"Co-immunoprecipitation, in vitro kinase assay with purified PKC-ι, siRNA knockdown, phosphorylation analysis","journal":"Carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — direct association and kinase assay with knockdown confirmation, single lab","pmids":["22021906"],"is_preprint":false},{"year":2019,"finding":"CDK7 phosphorylates YAP/TAZ at S128/S90 (and Drosophila Yki at S169) to inhibit recruitment of the CRL4DCAF12 E3 ubiquitin ligase complex, preventing ubiquitination and degradation of YAP/TAZ in the nucleus. CDK7 inactivation reduces organ size and inhibits tumor growth, which is reversed by restoring Yki/YAP activity.","method":"Drosophila genetics, co-immunoprecipitation, in vitro kinase assay, ubiquitination assay, CRISPR in mammalian cells","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetics with biochemical reconstitution, site-specific mutagenesis, functional rescue across species","pmids":["31857346"],"is_preprint":false},{"year":2023,"finding":"CDK7 phosphorylates nuclear YAP1 at S127 and S397 sites, enhancing its transcriptional function and promoting LDHD protein expression. The CDK7-YAP-LDHD axis enables cancer stem cells to eliminate D-lactate and generate pyruvate, supporting stemness and ferroptosis resistance.","method":"In vitro phosphorylation assay, site-directed mutagenesis, ChIP-seq, co-immunoprecipitation, loss-of-function in ESCC cells","journal":"Signal transduction and targeted therapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phosphorylation site mapped with mutagenesis, functional consequence demonstrated, single lab","pmids":["37582812"],"is_preprint":false},{"year":2016,"finding":"Triptolide activates CDK7 by phosphorylating Thr170 in parental and MDR tumor cell lines, and CDK7 then phosphorylates RNA pol II large subunit RPB1 at Ser1878, leading to RPB1 degradation and cell killing. Selective CDK7 inhibitor BS-181 partially rescued RPB1 degradation and cell killing by triptolide.","method":"In vitro and cell-based kinase assays, CDK7 selective inhibitor rescue experiment, phosphorylation site mapping","journal":"Molecular cancer therapeutics","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — inhibitor rescue with site identification, single lab, limited reconstitution","pmids":["27197304"],"is_preprint":false},{"year":2023,"finding":"Active mTOR signaling promotes CDK7 inhibitor (samuraciclib)-induced cellular senescence (permanent cell cycle exit). CDK7 inhibition by samuraciclib induces senescence without promoting DNA damage signaling or cell death. mTOR inhibition decreases sensitivity to CDK7 inhibition, and reverting a growth-promoting PIK3CA mutation to wild type decreases CDK7i sensitivity.","method":"Genome-wide CRISPR knockout screen, genetic reversion of PIK3CA mutation, senescence assays, cell viability","journal":"Molecular cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide screen with genetic validation, specific cellular phenotype characterized, single lab","pmids":["37977119"],"is_preprint":false}],"current_model":"CDK7 is the catalytic subunit of the trimeric CDK-activating kinase (CAK) complex (with cyclin H and MAT1), which activates cell-cycle CDKs (CDK1, CDK2, CDK4, CDK6, and CDK5) by phosphorylating their T-loop threonines; as the kinase subunit of TFIIH, CDK7 also phosphorylates the RNA polymerase II CTD to drive promoter escape and transcription initiation, with substrate specificity shifted toward CTD by MAT1 and TFIIH context, while T-loop phosphorylation (pS164 then pT170) regulates complex stability and stimulates activity toward non-CDK substrates including CTD and SPT5; CDK7 further directly activates the transcriptional kinases CDK9, CDK12, and CDK13, phosphorylates splicing factors (SF3B1, U2AF2), and phosphorylates transcriptional regulators including p53 (Ser33), MED1 (T1457), and YAP/TAZ, placing CDK7 as a master regulator coordinating cell-cycle progression with transcriptional output."},"narrative":{"mechanistic_narrative":"CDK7 is a serine/threonine kinase that couples cell-cycle control to transcription by functioning in two distinct biochemical settings [PMID:8069918, PMID:8001135]. As the catalytic subunit of the CDK-activating kinase (CAK), it assembles with cyclin H and MAT1 into a trimeric complex [PMID:8069918, PMID:8078587, PMID:8617234] that phosphorylates the T-loop threonine of cell-cycle CDKs — CDK2 and CDC2/CDK1 [PMID:8069918, PMID:8344251], CDK4 and CDK6 [PMID:23622515], and CDK5 [PMID:14586172] — to activate them; immunodepletion and metazoan genetics establish CDK7 as the genuine, essential CAK in vivo [PMID:8344251, PMID:9450931, PMID:9315098]. Within the TFIIH transcription/repair factor, CDK7 instead phosphorylates the RNA polymerase II CTD to drive promoter escape, release of initiation factors and Mediator, capping enzyme and SETD1A/B recruitment, and the transition to productive elongation [PMID:8001135, PMID:26257281, PMID:28768201, PMID:38821049]. Substrate selection is governed by complex context: MAT1 and the TFIIH core shift specificity from CDKs toward the CTD [PMID:9130709, PMID:10801852], while CAK dissociation from TFIIH licenses phosphorylation of broader targets including the transcriptional kinases CDK9, CDK12 and CDK13 and the splicing factors SF3B1 and U2AF2 [PMID:33060135]. CDK7 activity is itself regulated by dual T-loop phosphorylation (pS164 then pT170), which stabilizes the complex and selectively boosts activity toward non-CDK substrates such as the CTD and SPT5 without altering CAK function [PMID:11447116, PMID:39097586], and by MAT1, which can position the T-loop in its active conformation independently of phosphorylation [PMID:33055219]. Beyond core transcription, CDK7 phosphorylates regulators including p53 at Ser33 [PMID:9372954], MED1 at T1457 to support androgen-receptor super-enhancer transcription [PMID:31466944], and YAP/TAZ to block their ubiquitin-mediated degradation and promote organ growth and tumorigenesis [PMID:31857346, PMID:37582812]. Selective covalent and chemical-genetic inhibitors have separated CDK7's direct G1/S and E2F-driven cell-cycle role from CTD-phosphorylation effects previously attributed to it, and link CDK7 inhibition to senescence and to therapeutic vulnerability in cancer [PMID:30905681, PMID:37977119].","teleology":[{"year":1994,"claim":"Established the founding identity of CDK7 as the catalytic subunit of CAK, answering how cell-cycle CDKs themselves become activated.","evidence":"Protein purification, cDNA cloning, in vitro reconstitution with cyclin H and mutagenesis of the conserved T-loop threonine; immunodepletion from Xenopus extracts with functional recovery","pmids":["8069918","8344251","8078587","7935441"],"confidence":"High","gaps":["Did not resolve how the same kinase is partitioned between CAK and transcription roles","Structural basis of CDK substrate recognition not yet defined"]},{"year":1994,"claim":"Connected CDK7 to transcription and DNA repair by placing it in TFIIH and identifying the RNA pol II CTD as a substrate, revealing a kinase that bridges cell cycle, transcription, and repair.","evidence":"Biochemical association studies and in vitro/in vivo nucleotide-excision-repair assays","pmids":["8001135"],"confidence":"High","gaps":["Mechanism switching CDK7 between CDK and CTD substrates not yet defined","Functional consequences of CTD phosphorylation on transcription steps unresolved"]},{"year":1996,"claim":"Defined the trimeric CAK architecture and showed MAT1 as a stimulatory assembly factor, and that TFIIH-associated CDK7 is downregulated by UV, linking the kinase to stress responses.","evidence":"Biochemical fractionation, reciprocal co-IP, in vitro kinase assays under UV irradiation","pmids":["8617234"],"confidence":"High","gaps":["How MAT1 reshapes the active site was not structurally defined","Physiological signal controlling free vs TFIIH-bound CAK unknown"]},{"year":1997,"claim":"Showed that MAT1 and the TFIIH core context act as substrate-specificity switches, explaining how one kinase serves both CDK activation and CTD phosphorylation.","evidence":"In vitro kinase assays comparing free CAK and TFIIH-associated kinase across multiple substrates (CTD, CDK2, TFIIE, TFIIF), plus p53 Ser33 phosphorylation with site mutagenesis","pmids":["9130709","9372954"],"confidence":"High","gaps":["Quantitative contribution of each context to in vivo specificity not established","p53 Ser33 phosphorylation's physiological output not resolved here"]},{"year":1998,"claim":"Genetic proof in a metazoan that cdk7 is the bona fide CAK required for CDK activation and cell division, and that its CTD activity is repressed at mitosis.","evidence":"Drosophila null and temperature-sensitive alleles with in vivo CAK assays; mitotic kinase and in vitro transcription assays with p21 rescue","pmids":["9450931","9488463"],"confidence":"High","gaps":["Direct kinase responsible for mitotic CDK7 inhibition in vivo not fully defined","Coupling of transcriptional repression to mitotic CDK7 shutdown mechanistic detail incomplete"]},{"year":2001,"claim":"Defined T-loop phosphorylation (Ser164/Thr170) as a substrate-selective regulator that boosts CTD activity via increased kcat while sparing CDK activation, distinguishing CAK from transcriptional functions.","evidence":"Drosophila phosphosite mutants, co-IP, in vitro kinase kinetics","pmids":["11447116"],"confidence":"High","gaps":["Upstream kinase priming T-loop phosphorylation not identified here","Structural basis of substrate-selective activation not resolved"]},{"year":2004,"claim":"Provided the first atomic view of CDK7, showing an inactive conformation with phosphorylated Thr170 and that CDK7 is not dephosphorylated by KAP, refining models of its activation.","evidence":"X-ray crystallography of CDK7-ATP at 3 Å with in vitro kinase assays","pmids":["15530371"],"confidence":"High","gaps":["Structure of the active trimeric CAK not yet captured","Cyclin H/MAT1 contacts not visualized in this structure"]},{"year":2013,"claim":"Extended CDK7 substrate range to CDK4/CDK6 and revealed a continuous-activation requirement during G1, defining a mitogen-driven CDK-activation cascade distinct from CDK1/CDK2.","evidence":"Analog-sensitive CDK7 chemical genetics, in vitro kinase assays, synchronization and phosphorylation analysis","pmids":["23622515"],"confidence":"High","gaps":["Why CDK4/6 require continuous vs transient CDK7 input mechanistically unresolved","Direct in vivo ordering of CDK7-CDK4 phosphorylation not fully isolated from feedback"]},{"year":2015,"claim":"Dissected CDK7's role across transcription steps in vitro — CTD phosphorylation, capping, pausing, and elongation — showing it acts after initiation.","evidence":"In vitro transcription with nuclear extract and THZ1 inhibitor, RNA pol II phosphorylation assays","pmids":["26257281"],"confidence":"High","gaps":["THZ1 off-target effects on CDK12/13 not yet accounted for","Direct vs indirect effects on pausing not fully separated in this assay"]},{"year":2017,"claim":"Linked CDK7-dependent CTD phosphorylation to a chromatin 'code' that recruits capping enzymes and SETD1A/B, connecting transcription initiation to histone methylation patterning.","evidence":"Analog-sensitive CDK7 cells, ChIP-seq, mass spectrometry, in vitro nucleosome methylation assays","pmids":["28768201"],"confidence":"High","gaps":["Causal chain from CTD marks to H3K4me3 spreading not fully reconstituted","Generality across gene classes not established"]},{"year":2019,"claim":"Identified CDK7 as the master upstream kinase shaping diverse outputs — MED1/AR super-enhancer transcription and YAP/TAZ stabilization — broadening its role into oncogenic transcriptional programs.","evidence":"ChIP-seq, phosphoproteomics, site mutagenesis and ubiquitination assays, Drosophila genetics, xenograft models with THZ1","pmids":["31466944","31857346"],"confidence":"High","gaps":["Whether these phosphorylations occur via free CAK or TFIIH-bound CDK7 not resolved","Direct vs indirect contribution of CDK7 to these substrates in vivo incompletely separated"]},{"year":2019,"claim":"Selective covalent inhibitor with rescue mutant proved CDK7's direct G1/S and E2F role and reassigned much CTD-phosphorylation phenotype to CDK12/13, correcting earlier inhibitor-based interpretations.","evidence":"Covalent inhibitor YKL-5-124 with on-target rescue mutant, cell-cycle and expression profiling, comparison to selective CDK12/13 inhibitor","pmids":["30905681"],"confidence":"High","gaps":["Quantitative split between CDK7 and CDK12/13 contributions to CTD phosphorylation context-dependent and unresolved","Direct CDK7 cell-cycle substrates driving E2F arrest not fully enumerated"]},{"year":2020,"claim":"Established CDK7 as the activating kinase for transcriptional CDK9/12/13 and resolved that TFIIH restricts CDK7 to the CTD while free CAK phosphorylates broader targets including splicing factors.","evidence":"Selective inhibitor SY-351, quantitative phosphoproteomics, in vitro kinase assays, RNA-seq splicing analysis; crystal structures of the trimeric CAK","pmids":["33060135","33055219"],"confidence":"High","gaps":["In vivo signals controlling CAK release from TFIIH not defined","Order and hierarchy of CDK9/12/13 activation by CDK7 not fully mapped"]},{"year":2024,"claim":"Resolved the two-step T-loop activation (pS164 priming pT170) structurally and mechanistically, and refined CDK7's role in promoter escape via release of initiation factors and Mediator.","evidence":"Crystal structure of dually phosphorylated human CAK with phosphomutant kinase assays; rapid CDK7 inhibition with multi-omics in human cells","pmids":["39097586","38821049"],"confidence":"High","gaps":["Kinase that deposits pS164 priming mark not identified","How initiation-factor release is spatially coordinated downstream not fully resolved"]},{"year":null,"claim":"How CDK7's distribution between CAK and TFIIH pools is dynamically controlled in vivo to coordinate cell-cycle progression with transcriptional output remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No identified signal or enzyme governing CAK release from TFIIH in cells","Upstream kinase priming the S164 T-loop site unknown","Relative in vivo importance of each substrate class across cell types undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,6,18,28]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,2,7,24,26]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[14]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,18,24]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[13,16,21]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[16]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[0,1,8,18,22]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[2,19,20,24,31]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[2]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[24]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[20]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[32]}],"complexes":["CDK-activating kinase (CAK: CDK7/cyclin H/MAT1)","TFIIH"],"partners":["CCNH","MNAT1","CDK2","CDK1","XPD","XPB","HINT/HINT1","MED1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P50613","full_name":"Cyclin-dependent kinase 7","aliases":["39 kDa protein kinase","p39 Mo15","CDK-activating kinase 1","Cell division protein kinase 7","Serine/threonine-protein kinase 1","TFIIH basal transcription factor complex kinase subunit"],"length_aa":346,"mass_kda":39.0,"function":"Serine/threonine kinase involved in cell cycle control and in RNA polymerase II-mediated RNA transcription (PubMed:9852112, PubMed:19136461, PubMed:26257281, PubMed:28768201). Cyclin-dependent kinases (CDKs) are activated by the binding to a cyclin and mediate the progression through the cell cycle. Each different complex controls a specific transition between 2 subsequent phases in the cell cycle. Required for both activation and complex formation of CDK1/cyclin-B during G2-M transition, and for activation of CDK2/cyclins during G1-S transition (but not complex formation). CDK7 is the catalytic subunit of the CDK-activating kinase (CAK) complex. Phosphorylates SPT5/SUPT5H, SF1/NR5A1, POLR2A, p53/TP53, CDK1, CDK2, CDK4, CDK6 and CDK11B/CDK11 (PubMed:9372954, PubMed:9840937, PubMed:19136461, PubMed:26257281, PubMed:28768201). Initiates transcription by RNA polymerase II by mediating phosphorylation of POLR2A at 'Ser-5' of the repetitive C-terminal domain (CTD) when POLR2A is in complex with DNA, promoting dissociation from DNA and initiation (PubMed:19136461, PubMed:26257281, PubMed:28768201). CAK activates the cyclin-associated kinases CDK1, CDK2, CDK4 and CDK6 by threonine phosphorylation, thus regulating cell cycle progression. CAK complexed to the core-TFIIH basal transcription factor activates RNA polymerase II by serine phosphorylation of the CTD of POLR2A, allowing its escape from the promoter and elongation of the transcripts (PubMed:9852112). Its expression and activity are constant throughout the cell cycle. Upon DNA damage, triggers p53/TP53 activation by phosphorylation, but is inactivated in turn by p53/TP53; this feedback loop may lead to an arrest of the cell cycle and of the transcription, helping in cell recovery, or to apoptosis. Required for DNA-bound peptides-mediated transcription and cellular growth inhibition","subcellular_location":"Nucleus; Cytoplasm; Cytoplasm, perinuclear region","url":"https://www.uniprot.org/uniprotkb/P50613/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/CDK7","classification":"Common Essential","n_dependent_lines":1206,"n_total_lines":1208,"dependency_fraction":0.9983443708609272},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000134058","cell_line_id":"CID001151","localizations":[{"compartment":"nucleoplasm","grade":3},{"compartment":"nuclear_punctae","grade":2},{"compartment":"nucleolus_fc_dfc","grade":1}],"interactors":[{"gene":"CDC7","stoichiometry":10.0},{"gene":"GTF2H1","stoichiometry":10.0},{"gene":"MNAT1","stoichiometry":10.0},{"gene":"ERCC2","stoichiometry":10.0},{"gene":"ERCC3","stoichiometry":10.0},{"gene":"CCNH","stoichiometry":10.0},{"gene":"GTF2H3","stoichiometry":10.0},{"gene":"RAD23B","stoichiometry":10.0},{"gene":"GTF2H5","stoichiometry":10.0},{"gene":"GTF2H2C","stoichiometry":10.0}],"url":"https://opencell.sf.czbiohub.org/target/CID001151","total_profiled":1310},"omim":[{"mim_id":"614084","title":"WEE1 HOMOLOG 2; WEE2","url":"https://www.omim.org/entry/614084"},{"mim_id":"610076","title":"CYCLIN-DEPENDENT KINASE 20; CDK20","url":"https://www.omim.org/entry/610076"},{"mim_id":"605065","title":"CELL DIVISION CYCLE 37, HSP90 COCHAPERONE; CDC37","url":"https://www.omim.org/entry/605065"},{"mim_id":"603251","title":"CYCLIN-DEPENDENT KINASE 9; CDK9","url":"https://www.omim.org/entry/603251"},{"mim_id":"603184","title":"CYCLIN-DEPENDENT KINASE 8; CDK8","url":"https://www.omim.org/entry/603184"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Nucleoli fibrillar center","reliability":"Additional"},{"location":"Plasma membrane","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CDK7"},"hgnc":{"alias_symbol":["CAK1","CDKN7","MO15","STK1","CAK"],"prev_symbol":[]},"alphafold":{"accession":"P50613","domains":[{"cath_id":"3.30.200.20","chopping":"11-92","consensus_level":"medium","plddt":79.7502,"start":11,"end":92},{"cath_id":"1.10.510.10","chopping":"95-305","consensus_level":"high","plddt":90.5386,"start":95,"end":305}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P50613","model_url":"https://alphafold.ebi.ac.uk/files/AF-P50613-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P50613-F1-predicted_aligned_error_v6.png","plddt_mean":82.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CDK7","jax_strain_url":"https://www.jax.org/strain/search?query=CDK7"},"sequence":{"accession":"P50613","fasta_url":"https://rest.uniprot.org/uniprotkb/P50613.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P50613/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P50613"}},"corpus_meta":[{"pmid":"8069918","id":"PMC_8069918","title":"A 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CDK-activating kinase (CAK), which complexes with cyclin H (37 kDa) to form a functional kinase. Reconstitution of CAK in vitro with MO15 and cyclin H demonstrated that MO15 is a cyclin-dependent kinase (CDK7). A conserved threonine in CDK7 is required for full CAK activity; mutation of this residue severely reduces activity. CAK phosphorylates and activates CDK2/cyclin and CDC2/cyclin complexes.\",\n      \"method\": \"Protein purification from mammalian cells, protein sequencing, cDNA cloning, in vitro reconstitution, site-directed mutagenesis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with mutagenesis, foundational study replicated across multiple labs\",\n      \"pmids\": [\"8069918\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"MO15 (CDK7) is the catalytic subunit of a CAK that activates cdc2, cdk2, and divergent cdc2-like proteins through phosphorylation of Thr161 (or its homologues) in the T-loop. Immunodepletion of MO15 from Xenopus egg extracts depletes CAK activity, which is recovered in immunoprecipitates, establishing MO15 as the catalytic subunit of CAK in vivo.\",\n      \"method\": \"Protein purification from starfish oocytes, microsequencing, immunodepletion from Xenopus egg extracts, immunoprecipitation kinase assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — biochemical purification, immunodepletion with functional recovery, replicated across organisms\",\n      \"pmids\": [\"8344251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"CDK7 (MO15) is associated with the TFIIH transcription-DNA repair factor and phosphorylates the C-terminal domain (CTD) of RNA polymerase II. CDK7 is important for nucleotide excision repair through its association with TFIIH, linking cell cycle regulation, transcription, and DNA repair.\",\n      \"method\": \"In vivo and in vitro repair assays, biochemical association studies\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — functional in vitro and in vivo repair assays, association demonstrated, replicated by multiple labs\",\n      \"pmids\": [\"8001135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Cyclin H is a MO15 (CDK7)-associated protein identified by yeast two-hybrid screen and confirmed as a major MO15 partner in vivo; cyclin H binding enhances MO15 kinase activity towards Cdk2/cyclin A, demonstrating that a cyclin/kinase complex can regulate other cyclin/kinase complexes.\",\n      \"method\": \"Yeast two-hybrid screen, co-immunoprecipitation, in vitro kinase assay\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — yeast two-hybrid with in vivo co-IP validation and kinase assay, replicated by concurrent studies\",\n      \"pmids\": [\"8078587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Mouse CDK7 (p39MO15) assembles with cyclin H to generate a CAK activity capable of phosphorylating and activating both CDK2 and CDK4 in complexes with their respective cyclins (cyclin A and cyclin D). Antisera against p39MO15 completely depletes mammalian cell lysates of CAK activity for both substrates. CAK activity is present in quiescent and cycling cells and is invariant throughout the cell cycle.\",\n      \"method\": \"In vitro reconstitution with insect and mammalian cell proteins, immune complex CAK assay, immunodepletion\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — reconstitution, immunodepletion, kinase assays across cell cycle stages\",\n      \"pmids\": [\"7935441\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"MAT1, cyclin H, and CDK7 form a ternary kinase complex (CAK) that exists either free or associated with TFIIH. MAT1 is strongly associated with CDK7 and cyclin H and stimulates the kinase activity of the complex, though it is not strictly required for complex formation or basal activity. The kinase activity of TFIIH-associated CDK7 is reduced after UV light irradiation.\",\n      \"method\": \"Biochemical fractionation, co-immunoprecipitation, in vitro kinase assay, UV irradiation\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, kinase assay, multiple conditions tested; replicated by concurrent studies\",\n      \"pmids\": [\"8617234\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"MAT1 is required for efficient phosphorylation of p53 by CDK7-cyclin H at Ser33 in vitro, while CDK7-cyclin H alone is sufficient to phosphorylate CDK2. MAT1 acts as a substrate specificity-determining factor for CDK7-cyclin H. p53 is phosphorylated at Ser33 in vivo. p36MAT1 and p53 interact both in vitro and in vivo.\",\n      \"method\": \"In vitro phosphorylation assays, site-directed mutagenesis, in vivo phosphorylation, co-immunoprecipitation, pulldown\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro reconstitution, mutagenesis of phosphorylation site, in vivo validation, reciprocal interaction\",\n      \"pmids\": [\"9372954\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Addition of MAT1 to recombinant bipartite CDK7-cyclin H switches its substrate preference to favour the RNA pol II CTD over CDK2. TFIIH-associated CDK7 has a strong preference for CTD over CDK2, and acquires specificity for TFIIE and TFIIF not recognized by free CAK. Thus both MAT1 and core TFIIH context govern CDK7 substrate specificity.\",\n      \"method\": \"In vitro kinase assays with recombinant proteins, comparison of free CAK vs. TFIIH-associated kinase, substrate competition assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro systems with multiple substrates, multiple CDK7 complex forms compared\",\n      \"pmids\": [\"9130709\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Drosophila cdk7 is necessary for CAK activity in vivo in a multicellular organism, as demonstrated by null and temperature-sensitive mutations. cdk7 activity is required for activation of both Cdc2/Cyclin A and Cdc2/Cyclin B complexes, and for cell division, establishing cdk7 as the genuine CAK in metazoans.\",\n      \"method\": \"Genetic: null and temperature-sensitive alleles, in vivo CAK activity assay, genetic complementation\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic loss-of-function with specific molecular and cellular phenotypes, model organism\",\n      \"pmids\": [\"9450931\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"CDK7/cyclin H kinase activity within TFIIH is inhibited concomitantly with transcriptional repression at mitosis. cdc2/cyclin B phosphorylates p62 and p36 subunits of TFIIH in vitro, and CDK7/cyclin H-mediated CTD phosphorylation is inhibited when cells enter mitosis. This inhibition can be reversed by p21Waf1/Cip1/Sdi1.\",\n      \"method\": \"In vitro transcription with nuclear extracts, mitotic kinase assays, protein phosphorylation labeling, inhibitor rescue experiments\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — multiple biochemical methods in one study, in vitro and cell-based assays\",\n      \"pmids\": [\"9488463\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Cyclin H/CDK7/p36 and cyclin C/CDK8 are biochemically distinct CTD kinases that phosphorylate distinct residues in recombinant CTD substrates and differentially phosphorylate endogenous RNA polymerase II in vivo, suggesting unique roles in transcriptional regulation.\",\n      \"method\": \"In vitro kinase assays with recombinant and endogenous substrates, site-specific phosphorylation mapping, small-molecule inhibitor profiling\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro and in vivo phosphorylation comparison, single lab with multiple substrates\",\n      \"pmids\": [\"10023686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"T-loop phosphorylation of CDK7 (at Ser164 or Thr170) cooperates with MAT1 binding to stabilize the CDK7-cyclin H-MAT1 complex in vivo. Phosphorylation of Thr170 greatly stimulates CTD kinase activity without significantly affecting CDK2 substrate activity, due to accelerated enzyme turnover (increased kcat). This substrate-specific regulation could augment CTD phosphorylation by TFIIH-associated CDK7.\",\n      \"method\": \"Drosophila genetics (temperature-sensitive and phosphosite mutants), co-immunoprecipitation, in vitro kinase assay with enzyme kinetics\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — genetic and biochemical orthogonal methods, mechanistic kinetic analysis\",\n      \"pmids\": [\"11447116\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The C-terminus of MAT1 binds to the CDK7-cyclin H complex and activates CDK7 kinase activity. The median coiled-coil region of MAT1 anchors CAK to the TFIIH core through interactions with XPD and XPB helicases. The N-terminal RING finger domain of MAT1 is crucial for transcription activation and for CTD phosphorylation by TFIIH.\",\n      \"method\": \"Recombinant TFIIH reconstitution, deletion mutagenesis of MAT1, in vitro kinase and transcription assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstituted complexes, domain mapping by mutagenesis, functional transcription assays\",\n      \"pmids\": [\"10801852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"CDK7 interacts with the histidine triad protein Hint/PKCI-1. This interaction is independent of cyclin H binding or CDK7 kinase activity and is conserved between CDK7/Hint and the yeast Kin28/Hnt1. Overexpression of CDK7 causes partial relocalization of Hint to the nucleus. Genetic interaction between KIN28 and HNT1 in yeast leads to elongated cell morphology and reduced colony formation.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, subcellular localization by microscopy, yeast genetics (double mutant)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — yeast two-hybrid confirmed by co-IP and localization; genetic interaction in yeast\",\n      \"pmids\": [\"10958787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The crystal structure of human CDK7 in complex with ATP was determined at 3 Å resolution. The kinase is in an inactive conformation similar to inactive CDK2. The activation segment is phosphorylated at Thr170 and is in a defined conformation differing from phospho-CDK2. CDK7 is not a substrate for kinase-associated phosphatase.\",\n      \"method\": \"X-ray crystallography, in vitro kinase assays\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with functional validation in one study\",\n      \"pmids\": [\"15530371\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Mutagenesis studies identified regions in CDK2 responsible for its recognition by CDK7. CDK7 and CDK2 interact in a quasi-symmetric head-to-tail arrangement where the N-terminal lobe of one kinase docks against the C-terminal lobe of the other. Cyclin A hydrophobic pocket is not a recruitment site for CDK7. CDK1 and CDK2 can phosphorylate CDK7, but CDK7 cannot autophosphorylate.\",\n      \"method\": \"Site-directed mutagenesis of CDK2, in vitro kinase assays, structural modeling\",\n      \"journal\": \"Proteins\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-3 / Moderate — mutagenesis with kinase assays, structural model but not crystal structure, single lab\",\n      \"pmids\": [\"17373709\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"CDK7, cyclin H, and MAT1 within the CAK complex are localized to coiled bodies (subnuclear structures enriched in snRNPs) in vivo. Cyclin H localization to coiled bodies is predominantly detected during G1 and S phases, with decreased detection in G2. CDK7 and cyclin H do not colocalize with P80 coilin after coiled body disruption, indicating specific targeting to the snRNP-containing domain.\",\n      \"method\": \"Immunofluorescence microscopy, cell cycle synchronization\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct localization by immunofluorescence, cell cycle-dependent pattern, single lab\",\n      \"pmids\": [\"9243502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"CDK7 immunodepletion from cycling Xenopus egg extracts suppresses CAK activity and arrests extracts before M-phase. Translation of mRNAs encoding Xenopus CDK7 and its associated subunits restores CAK activity in CDK7-immunodepleted extracts, demonstrating that the CDK7 complex is necessary and sufficient for CDK activation in cycling vertebrate extracts.\",\n      \"method\": \"Immunodepletion from Xenopus egg extracts, mRNA injection, in vitro CAK activity assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — immunodepletion with functional rescue by specific mRNAs in cell-free system\",\n      \"pmids\": [\"9315098\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CDK7 is a CDK4- and CDK6-activating kinase in human cells, required to maintain their activity continuously (not just to establish the active state, unlike CDK1/CDK2). Activating phosphorylation of CDK7 rises concurrently with CDK4 phosphorylation as cells exit quiescence, and CDK7 accelerates CDK4 activation in vitro. This reveals a CDK-activation cascade during G1 driven by mitogen signaling.\",\n      \"method\": \"Chemical genetics (analog-sensitive CDK7), in vitro kinase assay, cell synchronization and phosphorylation analysis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — chemical genetics with in vitro reconstitution, cell-based validation, mechanistic ordering established\",\n      \"pmids\": [\"23622515\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CDK7 inhibition (by THZ1) causes defects in RNA pol II CTD phosphorylation, co-transcriptional capping, promoter-proximal pausing, and productive elongation in vitro. CDK7 does not affect initiation but blocks essentially all CTD phosphorylation. THZ1 impacts pausing through a capping-independent block of DSIF and NELF loading; P-TEFb-dependent transition to elongation is also inhibited, likely due to loss of DSIF.\",\n      \"method\": \"In vitro transcription with nuclear extract, CDK7 inhibitor THZ1, RNA pol II phosphorylation assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro transcription reconstitution with mechanistic dissection at multiple steps\",\n      \"pmids\": [\"26257281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CDK7 inhibition in analog-sensitive cells reduces capping enzyme recruitment, increases RNA pol II promoter-proximal pausing, and causes defective termination at gene 3' ends. CDK7 regulates H3K4me3 spreading at gene 5' ends and H3K36me3 positioning via a CTD code: capping enzymes and H3K4 methyltransferases SETD1A/B selectively bind TFIIH-phosphorylated CTD and TFIIH-phosphorylated CTD stimulates SETD1A/B activity toward nucleosomes.\",\n      \"method\": \"CDK7 analog-sensitive cell system, ChIP-seq, mass spectrometry, in vitro nucleosome methylation assay\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — analog-sensitive system plus in vitro activity assay plus MS, multiple orthogonal methods\",\n      \"pmids\": [\"28768201\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CDK7 phosphorylates MED1 at T1457 in a CDK7-dependent manner; phosphorylated MED1 physically engages androgen receptor (AR) at super-enhancer sites and is essential for AR-mediated transcription. CDK7 inhibition (THZ1) blocks AR/MED1 co-recruitment genome-wide and reverses the hyperphosphorylated MED1-associated enzalutamide-resistant phenotype.\",\n      \"method\": \"ChIP-seq, phosphoproteomic analysis, co-immunoprecipitation, CDK7 inhibitor treatment, CRPC xenograft model\",\n      \"journal\": \"Cancer discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — site-specific phosphorylation identified, genome-wide chromatin binding assay, functional rescue, in vivo validation\",\n      \"pmids\": [\"31466944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A selective covalent CDK7 inhibitor (YKL-5-124) causes arrest at the G1/S transition and inhibition of E2F-driven gene expression, rescued by a CDK7 mutant unable to covalently engage YKL-5-124, demonstrating on-target specificity. Unlike THZ1, YKL-5-124 did not change RNA pol II CTD phosphorylation, revealing that CDK12/13 (THZ1 off-targets) contribute to CTD phosphorylation effects previously attributed to CDK7.\",\n      \"method\": \"Covalent chemical inhibitor with on-target rescue mutant, cell cycle analysis, gene expression profiling, comparison with selective CDK12/13 inhibitor\",\n      \"journal\": \"Cell chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — allele-specific rescue controls, combination with selective CDK12/13 inhibitor for pathway dissection\",\n      \"pmids\": [\"30905681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Xpd regulates the subcellular localization of CDK7/CAK and local mitotic kinase activity. Loss of Xpd causes changes in the dynamics of CDK7 distribution to different subcellular compartments, resulting in defects in mitotic spindle dynamics, failure to segregate chromosomes, and chromosomal instability in Drosophila embryos.\",\n      \"method\": \"Drosophila genetics (xpd mutants), immunofluorescence microscopy for CDK7 localization, mitotic kinase activity assays\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic loss-of-function with direct localization and kinase activity measurements\",\n      \"pmids\": [\"20300654\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CDK7 directly activates transcription-associated kinases CDK9, CDK12, and CDK13 (master regulator role). TFIIH restricts CDK7 kinase function to the RNAPII CTD, whereas other substrates (e.g., SPT5, SF3B1) are phosphorylated by the free trimeric CAK (CDK7/CCNH/MAT1). CAK dissociation from TFIIH is essential for broader CDK7 kinase activation. CDK7 also phosphorylates splicing factors SF3B1 and U2AF2, causing widespread splicing defects.\",\n      \"method\": \"Selective CDK7 inhibitor SY-351, quantitative phosphoproteomics, in vitro kinase assays, RNA-seq for splicing analysis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — phosphoproteomics with selective inhibitor, biochemical validation, multiple orthogonal methods\",\n      \"pmids\": [\"33060135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The crystal structure of the CAK complex (CDK7/Cyclin H/MAT1) was solved at 2.6 Å resolution using Chaetomium thermophilum. The structure reveals an intricate network of interactions between CDK7 and its two binding partners. In vitro activity measurements and functional mutagenesis show that CDK7 activation can occur independent of T-loop phosphorylation and is exclusively MAT1-dependent by positioning the CDK7 T-loop in its active conformation.\",\n      \"method\": \"X-ray crystallography, in vitro kinase assays, site-directed mutagenesis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with functional mutagenesis and kinase assays in one study\",\n      \"pmids\": [\"33055219\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The crystal structure of the human CDK7/Cyclin H/MAT1 complex with dual T-loop phosphorylations (pS164 and pT170) was solved. pT170 coordinates conserved basic residues, while pS164 nucleates a unique arginine network involving all three subunits. CAK function (CDK activation) is unaffected by T-loop phosphorylation, whereas activity towards non-CDK substrates (CTD, SPT5) is increased several-fold by T170. Dual phosphorylation stimulates multisite phosphorylation of RNAPII CTD and SPT5. In human cells, CDK7 activation is a two-step process: S164 phosphorylation precedes and may prime T170 phosphorylation.\",\n      \"method\": \"X-ray crystallography, in vitro kinase assays with T-loop phosphomutants, cell-based phosphorylation analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with mutagenesis and in vitro kinase assays plus cell-based validation in one study\",\n      \"pmids\": [\"39097586\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Spironolactone-induced proteasomal degradation of XPB requires CDK7 kinase activity. CDK7 likely phosphorylates XPB at Ser90, which promotes recognition and polyubiquitination by SCFFBXL18 E3 ligase for proteasomal degradation.\",\n      \"method\": \"siRNA library screen, Western blotting, CDK7 kinase inhibition, site-directed mutagenesis of XPB Ser90\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — siRNA screen with mutagenesis confirmation, mechanistic model proposed with supporting but not fully reconstituted evidence\",\n      \"pmids\": [\"30762924\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"CDK7 (complexed with cyclin H and Mat1) functions as a CDK5-activating kinase in brain by phosphorylating CDK5 at Ser159, enhancing CDK5/p25 activity. CDK7 or cyclin H immunoprecipitates from mouse brain specifically phosphorylate CDK5 at Ser159; blocked CDK7 immunoprecipitate does not phosphorylate CDK5.\",\n      \"method\": \"Partial purification of brain enzyme, peptide phosphorylation assay, immunoprecipitation kinase assay from mouse brain, mutagenesis (Ser159Ala)\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — immunoprecipitation kinase assay with mutagenesis, single lab, not fully reconstituted\",\n      \"pmids\": [\"14586172\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"p16(INK4A) inhibits CDK7-mediated CTD kinase activity (in addition to CDK4-pRb kinase). The ability of p16(INK4A) to inhibit CDK7-CTD kinase contributes to its capacity to induce cell cycle arrest, representing an alternative pathway for p16-mediated cell cycle regulation.\",\n      \"method\": \"In vitro CTD kinase assay with p16, cell-based G1 arrest experiments\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro kinase assay with functional cell cycle readout, single lab\",\n      \"pmids\": [\"11003668\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CDK7 interacts functionally with MSL1, a component of the Drosophila dosage compensation complex. MSL1 depletion leads to decreased phosphorylation of Ser5 of RNA polymerase II CTD. Genetic and biochemical analyses reveal a functional interaction between MSL1 and CDK7.\",\n      \"method\": \"Genetic interaction analysis, biochemical co-precipitation, in vivo CTD phosphorylation measurement, transgenic flies with phosphomutants\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and biochemical in one study, functional phosphorylation readout, single lab\",\n      \"pmids\": [\"27183194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CDK7 kinase activity promotes RNA pol II escape from promoters by facilitating release of initiation factors and Mediator from RNA pol II. CDK7 inhibition causes RNA pol II retention at promoters, decreased initiation, and immediate global downregulation of transcript synthesis, while elongation and termination are not directly affected. RNA pol II can proceed into gene bodies without pausing while retaining initiation factors, which are released further downstream when CDK7-independent phosphorylation occurs.\",\n      \"method\": \"Rapid CDK7 kinase inhibition combined with multi-omics (TT-seq, ChIP-seq, etc.) in human cells\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — rapid inhibition kinetics with multi-omic analysis to distinguish direct from indirect effects, mechanistic model at each step\",\n      \"pmids\": [\"38821049\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CDK7 and CCNH (cyclin H) are required for meiotic progression of porcine oocytes. Overexpression of CDK7 or CCNH accelerates meiotic resumption, Thr161 phosphorylation of CDC2, cyclin B synthesis, and MPF activation; knockdown of CDK7 or CCNH inhibits these meiotic events. MNAT1 overexpression or knockdown had no influence on meiotic resumption.\",\n      \"method\": \"Overexpression and RNA knockdown (antisense RNA injection) in porcine oocytes, kinase activity assay, immunofluorescence\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain and loss of function with specific molecular and cellular phenotypes, single lab\",\n      \"pmids\": [\"21778139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PKC-ι directly associates with and phosphorylates CDK7 at T170 in a cell cycle-dependent manner in glioblastoma cells, leading to downstream CDK2 phosphorylation at T160 and G1-S progression. PKC-ι downregulation reduces CDK7 and CDK2 phosphorylation.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay with purified PKC-ι, siRNA knockdown, phosphorylation analysis\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — direct association and kinase assay with knockdown confirmation, single lab\",\n      \"pmids\": [\"22021906\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CDK7 phosphorylates YAP/TAZ at S128/S90 (and Drosophila Yki at S169) to inhibit recruitment of the CRL4DCAF12 E3 ubiquitin ligase complex, preventing ubiquitination and degradation of YAP/TAZ in the nucleus. CDK7 inactivation reduces organ size and inhibits tumor growth, which is reversed by restoring Yki/YAP activity.\",\n      \"method\": \"Drosophila genetics, co-immunoprecipitation, in vitro kinase assay, ubiquitination assay, CRISPR in mammalian cells\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetics with biochemical reconstitution, site-specific mutagenesis, functional rescue across species\",\n      \"pmids\": [\"31857346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CDK7 phosphorylates nuclear YAP1 at S127 and S397 sites, enhancing its transcriptional function and promoting LDHD protein expression. The CDK7-YAP-LDHD axis enables cancer stem cells to eliminate D-lactate and generate pyruvate, supporting stemness and ferroptosis resistance.\",\n      \"method\": \"In vitro phosphorylation assay, site-directed mutagenesis, ChIP-seq, co-immunoprecipitation, loss-of-function in ESCC cells\",\n      \"journal\": \"Signal transduction and targeted therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phosphorylation site mapped with mutagenesis, functional consequence demonstrated, single lab\",\n      \"pmids\": [\"37582812\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Triptolide activates CDK7 by phosphorylating Thr170 in parental and MDR tumor cell lines, and CDK7 then phosphorylates RNA pol II large subunit RPB1 at Ser1878, leading to RPB1 degradation and cell killing. Selective CDK7 inhibitor BS-181 partially rescued RPB1 degradation and cell killing by triptolide.\",\n      \"method\": \"In vitro and cell-based kinase assays, CDK7 selective inhibitor rescue experiment, phosphorylation site mapping\",\n      \"journal\": \"Molecular cancer therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — inhibitor rescue with site identification, single lab, limited reconstitution\",\n      \"pmids\": [\"27197304\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Active mTOR signaling promotes CDK7 inhibitor (samuraciclib)-induced cellular senescence (permanent cell cycle exit). CDK7 inhibition by samuraciclib induces senescence without promoting DNA damage signaling or cell death. mTOR inhibition decreases sensitivity to CDK7 inhibition, and reverting a growth-promoting PIK3CA mutation to wild type decreases CDK7i sensitivity.\",\n      \"method\": \"Genome-wide CRISPR knockout screen, genetic reversion of PIK3CA mutation, senescence assays, cell viability\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide screen with genetic validation, specific cellular phenotype characterized, single lab\",\n      \"pmids\": [\"37977119\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CDK7 is the catalytic subunit of the trimeric CDK-activating kinase (CAK) complex (with cyclin H and MAT1), which activates cell-cycle CDKs (CDK1, CDK2, CDK4, CDK6, and CDK5) by phosphorylating their T-loop threonines; as the kinase subunit of TFIIH, CDK7 also phosphorylates the RNA polymerase II CTD to drive promoter escape and transcription initiation, with substrate specificity shifted toward CTD by MAT1 and TFIIH context, while T-loop phosphorylation (pS164 then pT170) regulates complex stability and stimulates activity toward non-CDK substrates including CTD and SPT5; CDK7 further directly activates the transcriptional kinases CDK9, CDK12, and CDK13, phosphorylates splicing factors (SF3B1, U2AF2), and phosphorylates transcriptional regulators including p53 (Ser33), MED1 (T1457), and YAP/TAZ, placing CDK7 as a master regulator coordinating cell-cycle progression with transcriptional output.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CDK7 is a serine/threonine kinase that couples cell-cycle control to transcription by functioning in two distinct biochemical settings [#0, #2]. As the catalytic subunit of the CDK-activating kinase (CAK), it assembles with cyclin H and MAT1 into a trimeric complex [#0, #3, #5] that phosphorylates the T-loop threonine of cell-cycle CDKs — CDK2 and CDC2/CDK1 [#0, #1], CDK4 and CDK6 [#18], and CDK5 [#28] — to activate them; immunodepletion and metazoan genetics establish CDK7 as the genuine, essential CAK in vivo [#1, #8, #17]. Within the TFIIH transcription/repair factor, CDK7 instead phosphorylates the RNA polymerase II CTD to drive promoter escape, release of initiation factors and Mediator, capping enzyme and SETD1A/B recruitment, and the transition to productive elongation [#2, #19, #20, #31]. Substrate selection is governed by complex context: MAT1 and the TFIIH core shift specificity from CDKs toward the CTD [#7, #12], while CAK dissociation from TFIIH licenses phosphorylation of broader targets including the transcriptional kinases CDK9, CDK12 and CDK13 and the splicing factors SF3B1 and U2AF2 [#24]. CDK7 activity is itself regulated by dual T-loop phosphorylation (pS164 then pT170), which stabilizes the complex and selectively boosts activity toward non-CDK substrates such as the CTD and SPT5 without altering CAK function [#11, #26], and by MAT1, which can position the T-loop in its active conformation independently of phosphorylation [#25]. Beyond core transcription, CDK7 phosphorylates regulators including p53 at Ser33 [#6], MED1 at T1457 to support androgen-receptor super-enhancer transcription [#21], and YAP/TAZ to block their ubiquitin-mediated degradation and promote organ growth and tumorigenesis [#34, #35]. Selective covalent and chemical-genetic inhibitors have separated CDK7's direct G1/S and E2F-driven cell-cycle role from CTD-phosphorylation effects previously attributed to it, and link CDK7 inhibition to senescence and to therapeutic vulnerability in cancer [#22, #37].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Established the founding identity of CDK7 as the catalytic subunit of CAK, answering how cell-cycle CDKs themselves become activated.\",\n      \"evidence\": \"Protein purification, cDNA cloning, in vitro reconstitution with cyclin H and mutagenesis of the conserved T-loop threonine; immunodepletion from Xenopus extracts with functional recovery\",\n      \"pmids\": [\"8069918\", \"8344251\", \"8078587\", \"7935441\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve how the same kinase is partitioned between CAK and transcription roles\", \"Structural basis of CDK substrate recognition not yet defined\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Connected CDK7 to transcription and DNA repair by placing it in TFIIH and identifying the RNA pol II CTD as a substrate, revealing a kinase that bridges cell cycle, transcription, and repair.\",\n      \"evidence\": \"Biochemical association studies and in vitro/in vivo nucleotide-excision-repair assays\",\n      \"pmids\": [\"8001135\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism switching CDK7 between CDK and CTD substrates not yet defined\", \"Functional consequences of CTD phosphorylation on transcription steps unresolved\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Defined the trimeric CAK architecture and showed MAT1 as a stimulatory assembly factor, and that TFIIH-associated CDK7 is downregulated by UV, linking the kinase to stress responses.\",\n      \"evidence\": \"Biochemical fractionation, reciprocal co-IP, in vitro kinase assays under UV irradiation\",\n      \"pmids\": [\"8617234\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How MAT1 reshapes the active site was not structurally defined\", \"Physiological signal controlling free vs TFIIH-bound CAK unknown\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Showed that MAT1 and the TFIIH core context act as substrate-specificity switches, explaining how one kinase serves both CDK activation and CTD phosphorylation.\",\n      \"evidence\": \"In vitro kinase assays comparing free CAK and TFIIH-associated kinase across multiple substrates (CTD, CDK2, TFIIE, TFIIF), plus p53 Ser33 phosphorylation with site mutagenesis\",\n      \"pmids\": [\"9130709\", \"9372954\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative contribution of each context to in vivo specificity not established\", \"p53 Ser33 phosphorylation's physiological output not resolved here\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Genetic proof in a metazoan that cdk7 is the bona fide CAK required for CDK activation and cell division, and that its CTD activity is repressed at mitosis.\",\n      \"evidence\": \"Drosophila null and temperature-sensitive alleles with in vivo CAK assays; mitotic kinase and in vitro transcription assays with p21 rescue\",\n      \"pmids\": [\"9450931\", \"9488463\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct kinase responsible for mitotic CDK7 inhibition in vivo not fully defined\", \"Coupling of transcriptional repression to mitotic CDK7 shutdown mechanistic detail incomplete\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined T-loop phosphorylation (Ser164/Thr170) as a substrate-selective regulator that boosts CTD activity via increased kcat while sparing CDK activation, distinguishing CAK from transcriptional functions.\",\n      \"evidence\": \"Drosophila phosphosite mutants, co-IP, in vitro kinase kinetics\",\n      \"pmids\": [\"11447116\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream kinase priming T-loop phosphorylation not identified here\", \"Structural basis of substrate-selective activation not resolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Provided the first atomic view of CDK7, showing an inactive conformation with phosphorylated Thr170 and that CDK7 is not dephosphorylated by KAP, refining models of its activation.\",\n      \"evidence\": \"X-ray crystallography of CDK7-ATP at 3 Å with in vitro kinase assays\",\n      \"pmids\": [\"15530371\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of the active trimeric CAK not yet captured\", \"Cyclin H/MAT1 contacts not visualized in this structure\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Extended CDK7 substrate range to CDK4/CDK6 and revealed a continuous-activation requirement during G1, defining a mitogen-driven CDK-activation cascade distinct from CDK1/CDK2.\",\n      \"evidence\": \"Analog-sensitive CDK7 chemical genetics, in vitro kinase assays, synchronization and phosphorylation analysis\",\n      \"pmids\": [\"23622515\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why CDK4/6 require continuous vs transient CDK7 input mechanistically unresolved\", \"Direct in vivo ordering of CDK7-CDK4 phosphorylation not fully isolated from feedback\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Dissected CDK7's role across transcription steps in vitro — CTD phosphorylation, capping, pausing, and elongation — showing it acts after initiation.\",\n      \"evidence\": \"In vitro transcription with nuclear extract and THZ1 inhibitor, RNA pol II phosphorylation assays\",\n      \"pmids\": [\"26257281\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"THZ1 off-target effects on CDK12/13 not yet accounted for\", \"Direct vs indirect effects on pausing not fully separated in this assay\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Linked CDK7-dependent CTD phosphorylation to a chromatin 'code' that recruits capping enzymes and SETD1A/B, connecting transcription initiation to histone methylation patterning.\",\n      \"evidence\": \"Analog-sensitive CDK7 cells, ChIP-seq, mass spectrometry, in vitro nucleosome methylation assays\",\n      \"pmids\": [\"28768201\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causal chain from CTD marks to H3K4me3 spreading not fully reconstituted\", \"Generality across gene classes not established\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified CDK7 as the master upstream kinase shaping diverse outputs — MED1/AR super-enhancer transcription and YAP/TAZ stabilization — broadening its role into oncogenic transcriptional programs.\",\n      \"evidence\": \"ChIP-seq, phosphoproteomics, site mutagenesis and ubiquitination assays, Drosophila genetics, xenograft models with THZ1\",\n      \"pmids\": [\"31466944\", \"31857346\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether these phosphorylations occur via free CAK or TFIIH-bound CDK7 not resolved\", \"Direct vs indirect contribution of CDK7 to these substrates in vivo incompletely separated\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Selective covalent inhibitor with rescue mutant proved CDK7's direct G1/S and E2F role and reassigned much CTD-phosphorylation phenotype to CDK12/13, correcting earlier inhibitor-based interpretations.\",\n      \"evidence\": \"Covalent inhibitor YKL-5-124 with on-target rescue mutant, cell-cycle and expression profiling, comparison to selective CDK12/13 inhibitor\",\n      \"pmids\": [\"30905681\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative split between CDK7 and CDK12/13 contributions to CTD phosphorylation context-dependent and unresolved\", \"Direct CDK7 cell-cycle substrates driving E2F arrest not fully enumerated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established CDK7 as the activating kinase for transcriptional CDK9/12/13 and resolved that TFIIH restricts CDK7 to the CTD while free CAK phosphorylates broader targets including splicing factors.\",\n      \"evidence\": \"Selective inhibitor SY-351, quantitative phosphoproteomics, in vitro kinase assays, RNA-seq splicing analysis; crystal structures of the trimeric CAK\",\n      \"pmids\": [\"33060135\", \"33055219\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo signals controlling CAK release from TFIIH not defined\", \"Order and hierarchy of CDK9/12/13 activation by CDK7 not fully mapped\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Resolved the two-step T-loop activation (pS164 priming pT170) structurally and mechanistically, and refined CDK7's role in promoter escape via release of initiation factors and Mediator.\",\n      \"evidence\": \"Crystal structure of dually phosphorylated human CAK with phosphomutant kinase assays; rapid CDK7 inhibition with multi-omics in human cells\",\n      \"pmids\": [\"39097586\", \"38821049\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase that deposits pS164 priming mark not identified\", \"How initiation-factor release is spatially coordinated downstream not fully resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CDK7's distribution between CAK and TFIIH pools is dynamically controlled in vivo to coordinate cell-cycle progression with transcriptional output remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No identified signal or enzyme governing CAK release from TFIIH in cells\", \"Upstream kinase priming the S164 T-loop site unknown\", \"Relative in vivo importance of each substrate class across cell types undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 6, 18, 28]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 2, 7, 24, 26]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [14]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 18, 24]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [13, 16, 21]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0, 1, 8, 18, 22]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [2, 19, 20, 24, 31]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [24]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [20]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [32]}\n    ],\n    \"complexes\": [\"CDK-activating kinase (CAK: CDK7/cyclin H/MAT1)\", \"TFIIH\"],\n    \"partners\": [\"CCNH\", \"MNAT1\", \"CDK2\", \"CDK1\", \"XPD\", \"XPB\", \"Hint/HINT1\", \"MED1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}