{"gene":"WHR1","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":1994,"finding":"The G11 gene in the human MHC class III region spans ~9.1 kb, is split into 7 exons, has a CpG island at its 5' end, and encodes protein products of 254 or 258 amino acids (due to differential splicing of two sites 12 bp apart at the end of exon 3). The encoded polypeptides share homology with human cytochrome P450XIB1 and the tyrosine kinase transforming protein from Fujinami virus.","method":"cDNA cloning, genomic sequencing, Northern blot, exon mapping","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct molecular characterization of gene structure and transcripts by cDNA/genomic cloning with sequencing in a single focused study","pmids":["8012361"],"is_preprint":false},{"year":1998,"finding":"The G11 gene (MHC class III) encodes a Ser/Thr protein kinase of 41.5 kDa and 30 kDa isoforms. After immunoprecipitation from baculovirus-infected insect cells or transfected COS-7 cells, the immunoprecipitates displayed Mn2+-dependent kinase activity phosphorylating alpha-casein at Ser/Thr residues and histone at Ser residues. Mutation of the invariant lysine (K317P) in the putative ATP-binding site completely abolished kinase activity. The G11 polypeptide was covalently modified by the reactive ATP analogue 5'-p-fluorosulfonylbenzoyladenosine, and this modification was blocked by 1 mM ATP. Immunofluorescence of transfected COS-7 cells showed the kinase localizes predominantly to the nucleus.","method":"Baculovirus expression, immunoprecipitation kinase assay, active-site mutagenesis (K317P), ATP analogue labeling, immunofluorescence","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay with mutagenesis of catalytic residue and ATP-binding confirmation, but subsequent structural work challenges kinase interpretation; single lab","pmids":["9812991"],"is_preprint":false},{"year":2019,"finding":"STK19 was reported to phosphorylate NRAS, enhancing its binding to downstream effectors and promoting oncogenic NRAS-driven melanocyte malignant transformation. A recurrent D89N substitution was described as a gain-of-function mutation that interacts better with NRAS. STK19D89N knockin mice showed skin hyperpigmentation and promoted NRASQ61R-driven melanomagenesis in vivo. A specific STK19 inhibitor (ZT-12-037-01) blocked NRAS-driven melanocyte transformation and melanoma growth.","method":"In vitro kinase assay, co-immunoprecipitation, knockin mouse model, pharmacological inhibition","journal":"Cell","confidence":"Low","confidence_rationale":"Tier 3 / Weak — findings disputed by subsequent papers (PMID 32531245) showing D89N is outside the coding region and STK19 is exclusively nuclear/chromatin-associated with no detectable kinase activity; confidence lowered accordingly","pmids":["30712867"],"is_preprint":false},{"year":2020,"finding":"STK19 was shown to be exclusively nuclear and chromatin-associated. The expressed protein is 110 amino acids shorter than indicated by databases (the 'cancer-driving' D89N substitution falls outside the coding region). No evidence for STK19 being a kinase was found; NRAS phosphorylation by STK19 could not be reproduced.","method":"Re-annotation of gene structure, subcellular localization (immunofluorescence, fractionation), independent kinase assays","journal":"Cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiments and independent kinase assays with gene re-annotation; multiple orthogonal approaches, single lab","pmids":["32531245"],"is_preprint":false},{"year":2024,"finding":"Crystal structure of human STK19 at 1.32 Å resolution revealed it does not contain a kinase domain, but rather three intimately packed winged helix (WH) domains. The third WH domain mediates homodimerization and double-stranded DNA binding; both activities are required for nuclear localization. STK19 binds dsDNA and dsRNA through the same positively charged interface centered on helix WH3-H1. STK19 participates in nucleotide excision repair (NER) and mismatch repair (MMR) by recruiting repair factors RPA2 and PCNA. Dimerization and DNA-binding mutants cannot rescue the slow proliferation phenotype of STK19-knockdown cells.","method":"X-ray crystallography (1.32 Å), mutagenesis, co-immunoprecipitation, DNA/RNA binding assays, knockdown with phenotypic rescue","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution crystal structure combined with mutagenesis, binding assays, and functional rescue experiments in a single rigorous study","pmids":["38252411"],"is_preprint":false},{"year":2024,"finding":"STK19 is an essential factor for transcription-coupled nucleotide excision repair (TC-NER). Cryo-EM structure shows STK19 is an integral component of the RNA Pol II-TC-NER complex, bridging CSA, UVSSA, RNA Pol II, and downstream DNA. STK19 stimulates TC-NER complex stability and CRL4CSA ubiquitin ligase activity, resulting in efficient RNA Pol II ubiquitylation at RPB1-K1268 and correct UVSSA and TFIIH binding/recruitment.","method":"Cryo-EM structure, co-immunoprecipitation, ubiquitylation assays, loss-of-function (siRNA/KO) with repair and transcription restart readouts","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure combined with functional assays (ubiquitylation, TFIIH recruitment, repair) replicated across multiple concurrent independent studies","pmids":["39547223"],"is_preprint":false},{"year":2024,"finding":"STK19 is required for TC-NER and facilitates clearance of lesion-stalled RNA Pol II. Loss of STK19 does not impair initial TC-NER complex assembly or RNAPII ubiquitylation but delays RNAPII removal from lesion sites, blocking downstream repair. Cryo-EM and mutational analysis show STK19 positions itself between RNAPII, UVSSA, and CSA; molecular modeling suggests STK19 positions the ATPase subunits of TFIIH onto DNA ahead of RNAPII.","method":"Cryo-EM structure, genetic KO, live-cell imaging of RNAPII dynamics, mutational analysis","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure with mutagenesis and functional genetic experiments, independently replicated in concurrent studies","pmids":["39547229"],"is_preprint":false},{"year":2024,"finding":"STK19 positions TFIIH for TC-NER via interaction with both CSA/RPB1 and the XPD subunit of TFIIH. Cell-free TC-NER reconstituted in frog egg extract showed that repair of a site-specific lesion-containing plasmid requires STK19, CSB, CRL4CSA, UVSSA, and ELOF1. A 1.9-Å cryo-EM structure shows STK19 binds the TC-NER complex through CSA and RPB1. Disruption of the predicted STK19-XPD interface impairs cell-free repair.","method":"Cell-free TC-NER reconstitution in Xenopus egg extract, cryo-EM (1.9 Å), AlphaFold interface prediction with mutagenesis validation","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of complete repair pathway, high-resolution cryo-EM structure, and interface mutagenesis confirming functional interaction with TFIIH","pmids":["39547228"],"is_preprint":false},{"year":2024,"finding":"STK19 is recruited to DNA damage sites through direct interaction with CSA. STK19 can also interact with RNA Pol II directly in vitro. STK19 promotes UVSSA ubiquitination, which is required for TC-NER. STK19 also stimulates TFIIH recruitment independently of UVSSA ubiquitination through direct interaction with TFIIH.","method":"Co-immunoprecipitation, in vitro binding assay, ubiquitination assay, siRNA knockdown with TC-NER and unscheduled DNA synthesis readouts","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, in vitro binding, and functional ubiquitination/repair assays replicated across concurrent independent studies","pmids":["39353615"],"is_preprint":false},{"year":2024,"finding":"Cancer-associated mutations K186N, R200W, and R215W (found in cancer patients) map to a conserved positively charged patch on helix WH3-H1 and compromise STK19 dsDNA binding without disrupting protein folding. Mutations disrupting the nuclear localization signal (NLS) motif also impair DNA binding capacity indirectly by preventing nuclear entry.","method":"X-ray crystallography (1.32 Å), site-directed mutagenesis, electrophoretic mobility shift assay (EMSA)/DNA binding assay","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with mutagenesis and DNA binding assays identifying functionally relevant cancer mutations at the DNA-binding interface","pmids":["38890355"],"is_preprint":false},{"year":2024,"finding":"STK19 inhibition depletes MGMT (O6-methylguanine-DNA methyltransferase) and enhances cisplatin-induced DNA damage in tongue squamous cell carcinoma cells, leading to synergistic cell killing in combination with cisplatin both in vitro and in vivo.","method":"CRISPR/Cas9 library screen, genetic and pharmacological STK19 inhibition, cisplatin combination assays in vitro and xenograft models","journal":"Journal of translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR screen with genetic and pharmacological validation and in vivo confirmation, single lab","pmids":["41121307"],"is_preprint":false}],"current_model":"STK19 (also known as G11/D6S60/TWH19) is a nuclear MHC class III region protein that, contrary to earlier reports of serine/threonine kinase activity, is structurally a tandem winged-helix (WH) domain protein that binds double-stranded DNA and RNA; it functions as an essential factor in transcription-coupled nucleotide excision repair (TC-NER) by being recruited to lesion-stalled RNA Pol II through direct interaction with CSA and RPB1, where it stabilizes the TC-NER complex, stimulates CRL4CSA-mediated ubiquitylation of RNA Pol II at K1268, promotes UVSSA ubiquitination, and positions TFIIH (via interaction with its XPD subunit) onto DNA ahead of RNA Pol II for lesion verification and downstream repair."},"narrative":{"mechanistic_narrative":"STK19 (originally G11) is a nuclear, chromatin-associated factor essential for transcription-coupled nucleotide excision repair (TC-NER) [PMID:39547223, PMID:39547229]. Crystallography resolved it not as the serine/threonine kinase implied by early biochemical work but as a tandem winged-helix (WH) protein whose third WH domain mediates homodimerization and double-stranded DNA/RNA binding through a positively charged interface centered on helix WH3-H1; both dimerization and DNA binding are required for nuclear localization and for supporting cell proliferation [PMID:38252411]. In TC-NER, STK19 is an integral component of the lesion-stalled RNA Pol II repair complex, recruited through direct interaction with CSA and able to bind RPB1/RNA Pol II directly, where it bridges CSA, UVSSA, RNA Pol II, and downstream DNA [PMID:39547223, PMID:39353615]. There it stabilizes the complex, stimulates CRL4CSA-mediated ubiquitylation of RNA Pol II at RPB1-K1268 and promotes UVSSA ubiquitination, and positions TFIIH—via interaction with its XPD subunit—onto DNA ahead of RNA Pol II to drive lesion verification and Pol II clearance [PMID:39547223, PMID:39547228, PMID:39353615]. Cell-free reconstitution confirms STK19, alongside CSB, CRL4CSA, UVSSA, and ELOF1, is required for repair of a site-specific lesion [PMID:39547228]. Earlier reports of STK19 kinase activity and of an oncogenic NRAS-phosphorylating role were not reproduced: STK19 is exclusively nuclear with no detectable kinase activity, and the purported cancer-driving D89N substitution falls outside the coding region [PMID:32531245]. Cancer-associated mutations instead map to the WH3-H1 DNA-binding patch and compromise dsDNA binding without disrupting folding [PMID:38890355].","teleology":[{"year":1994,"claim":"Defining the genomic structure of the MHC class III G11 gene established it as a transcribed, alternatively spliced locus encoding a ~254-258 residue protein, providing the molecular starting point for functional study.","evidence":"cDNA cloning, genomic sequencing, and exon mapping of the human MHC class III region","pmids":["8012361"],"confidence":"Medium","gaps":["Function of the encoded protein undefined","Homology calls to P450 and a viral tyrosine kinase were sequence-based, not functional"]},{"year":1998,"claim":"An attempt to assign biochemical activity reported G11/STK19 as a nuclear Mn2+-dependent Ser/Thr kinase, an interpretation later overturned but which fixed the protein's nuclear localization.","evidence":"Baculovirus/COS-7 expression, immunoprecipitation kinase assays, active-site K317P mutagenesis, ATP-analogue labeling, immunofluorescence","pmids":["9812991"],"confidence":"Medium","gaps":["Kinase activity not confirmed by later structural and biochemical work","Physiological substrate never established"]},{"year":2019,"claim":"STK19 was advanced as an NRAS-phosphorylating kinase driving melanomagenesis, framing it as an oncogenic kinase and drug target—a model subsequently disputed.","evidence":"In vitro kinase assay, co-IP, D89N knockin mice, pharmacological inhibition (ZT-12-037-01)","pmids":["30712867"],"confidence":"Low","gaps":["NRAS phosphorylation by STK19 could not be reproduced","D89N maps outside the protein coding region","No kinase domain present in the protein structure"]},{"year":2020,"claim":"Re-annotation and independent assays corrected the gene model and refuted the kinase paradigm, showing STK19 is exclusively nuclear/chromatin-associated and 110 residues shorter than databases indicated.","evidence":"Gene structure re-annotation, immunofluorescence/fractionation, independent kinase assays","pmids":["32531245"],"confidence":"Medium","gaps":["Did not yet define the true molecular activity","Chromatin function unspecified"]},{"year":2024,"claim":"A 1.32-A crystal structure redefined STK19 as a tandem winged-helix protein, identifying WH3-mediated dimerization and a dsDNA/dsRNA-binding interface required for nuclear localization and proliferation.","evidence":"X-ray crystallography, mutagenesis, DNA/RNA binding assays, knockdown with phenotypic rescue; companion structure mapped cancer mutations to the WH3-H1 patch","pmids":["38252411","38890355"],"confidence":"High","gaps":["Initial repair-factor links (RPA2, PCNA) less defined than the later TC-NER mechanism","How DNA binding couples to specific repair steps not resolved here"]},{"year":2024,"claim":"Cryo-EM and reconstitution established STK19 as an integral TC-NER factor that bridges CSA, UVSSA, RNA Pol II, and DNA to stimulate CRL4CSA ubiquitylation and TFIIH positioning, resolving its physiological role.","evidence":"Cryo-EM of the RNA Pol II-TC-NER complex (down to 1.9 A), cell-free TC-NER reconstitution in Xenopus egg extract, co-IP, ubiquitylation and repair/transcription-restart assays, XPD-interface mutagenesis","pmids":["39547223","39547229","39547228","39353615"],"confidence":"High","gaps":["Whether STK19 acts solely structurally or contributes additional enzymatic chemistry unresolved","Precise mechanism of TFIIH translocation ahead of Pol II based partly on modeling"]},{"year":2024,"claim":"STK19 inhibition was linked to MGMT depletion and cisplatin sensitization, connecting its repair function to a candidate therapeutic vulnerability in carcinoma.","evidence":"CRISPR/Cas9 screen, genetic and pharmacological STK19 inhibition with cisplatin combination in vitro and in xenografts","pmids":["41121307"],"confidence":"Medium","gaps":["Mechanistic link between STK19 and MGMT levels not defined","Tested in tongue squamous cell carcinoma context only"]},{"year":null,"claim":"It remains unresolved whether STK19's dsRNA binding and its broader chromatin/genome-maintenance roles extend beyond TC-NER, and how its DNA-binding interface is mechanistically coupled to lesion verification.","evidence":"","pmids":[],"confidence":"High","gaps":["Function of dsRNA binding unknown","Role in mismatch repair vs TC-NER not disentangled","No catalytic activity assigned"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[4,9]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[4]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[5,6,7]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,3]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[3,4]}],"pathway":[{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[5,6,7]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[5,6]}],"complexes":["RNA Pol II-TC-NER complex"],"partners":["CSA","RPB1","UVSSA","XPD","TFIIH","RPA2","PCNA"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P49842","full_name":"Winged helix repair factor 1","aliases":["Inactive serine/threonine-protein kinase 19","Protein G11","Protein RP1","Tandem winged helix protein formerly known as STK19"],"length_aa":254,"mass_kda":28.5,"function":"DNA-binding protein which is required for efficient transcription-coupled nucleotide excision repair (TC-NER) (PubMed:38252411, PubMed:38890355, PubMed:39353615, PubMed:39547223, PubMed:39547228, PubMed:39547229). Acts as part of a TC-NER complex which assembles and interacts with RNA polymerase II (RNAPII) when it stalls at DNA lesions (PubMed:39547223, PubMed:39547228, PubMed:39547229). TC-NER complex subunit UVSSA binds to the GTF2H1/p62 subunit of the TFIIH transcription factor complex, tethering TFIIH to the TC-NER complex (PubMed:39547228). WHR1/STK19 then interacts with the XPD helicase subunit of TFIIH which guides TFIIH to DNA downstream of the stalled RNAPII, ensuring DNA repair (PubMed:39353615, PubMed:39547228, PubMed:39547229). Directly interacts with RNAPII and also binds to downstream DNA (PubMed:39547229). Promotes the timely removal of DNA damage-stalled RNAPII, allowing downstream NER factors to access DNA lesions (PubMed:39547228, PubMed:39547229). Required for monoubiquitination of UVSSA (PubMed:39353615). Regulates repositioning and stabilization of UVSSA within the TC-NER complex (PubMed:39547223). Stimulates ubiquitination of RNAPII complex member RBP1 (PubMed:39547223). Also binds to RNA and regulates the expression levels of many mRNAs (PubMed:38252411, PubMed:38890355)","subcellular_location":"Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/P49842/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/WHR1","classification":"Not Classified","n_dependent_lines":33,"n_total_lines":1090,"dependency_fraction":0.030275229357798167},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/WHR1","total_profiled":1310},"omim":[],"hpa":{"profiled":true,"resolved_as":"STK19","reliability":"Supported","locations":[{"location":"Nuclear speckles","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/STK19"},"hgnc":{"alias_symbol":["G11","RP1","D6S60","TWH19"],"prev_symbol":["STK19"]},"alphafold":{"accession":"P49842","domains":[{"cath_id":"-","chopping":"147-295","consensus_level":"medium","plddt":88.3177,"start":147,"end":295},{"cath_id":"1.10.10,1.10.10","chopping":"297-365","consensus_level":"medium","plddt":93.0768,"start":297,"end":365}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P49842","model_url":"https://alphafold.ebi.ac.uk/files/AF-P49842-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P49842-F1-predicted_aligned_error_v6.png","plddt_mean":87.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=WHR1","jax_strain_url":"https://www.jax.org/strain/search?query=WHR1"},"sequence":{"accession":"P49842","fasta_url":"https://rest.uniprot.org/uniprotkb/P49842.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P49842/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P49842"}},"corpus_meta":[{"pmid":"1309799","id":"PMC_1309799","title":"Activation of phospholipase C by the alpha subunits of the Gq and G11 proteins in transfected Cos-7 cells.","date":"1992","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/1309799","citation_count":303,"is_preprint":false},{"pmid":"1333052","id":"PMC_1333052","title":"Thyrotropin-releasing hormone and gonadotropin-releasing hormone receptors activate phospholipase C by coupling to the guanosine triphosphate-binding proteins Gq and G11.","date":"1992","source":"Molecular endocrinology (Baltimore, Md.)","url":"https://pubmed.ncbi.nlm.nih.gov/1333052","citation_count":250,"is_preprint":false},{"pmid":"8314796","id":"PMC_8314796","title":"Purification from Sf9 cells and characterization of recombinant Gq alpha and G11 alpha. 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phosphoinositidase C-linked guanine nucleotide binding proteins G11 alpha and Gq alpha in rat brain.","date":"1993","source":"Journal of neurochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/8395563","citation_count":55,"is_preprint":false},{"pmid":"8508928","id":"PMC_8508928","title":"The human muscarinic M1 acetylcholine receptor, when express in CHO cells, activates and downregulates both Gq alpha and G11 alpha equally and non-selectively.","date":"1993","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/8508928","citation_count":54,"is_preprint":false},{"pmid":"7615517","id":"PMC_7615517","title":"Degradation of G11 alpha/Gq alpha is accelerated by agonist occupancy of alpha 1A/D, alpha 1B, and alpha 1C adrenergic receptors.","date":"1995","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/7615517","citation_count":50,"is_preprint":false},{"pmid":"8569718","id":"PMC_8569718","title":"Prolonged exposure to agonist results in a 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hormone receptor agonist-mediated down-regulation of Gq alpha/G11 alpha (pertussis toxin-insensitive) G proteins in alpha T3-1 gonadotroph cells reflects increased G protein turnover but not alterations in mRNA levels.","date":"1995","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/7892195","citation_count":45,"is_preprint":false},{"pmid":"8218363","id":"PMC_8218363","title":"Distribution and relative levels of expression of the phosphoinositidase-C-linked G-proteins Gq alpha and G11 alpha: absence of G11 alpha in human platelets and haemopoietically derived cell lines.","date":"1993","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/8218363","citation_count":44,"is_preprint":false},{"pmid":"7519247","id":"PMC_7519247","title":"Characterization of neutralization epitopes on the VP7 surface protein of serotype G11 porcine rotaviruses.","date":"1994","source":"The Journal of 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Molecular brain research","url":"https://pubmed.ncbi.nlm.nih.gov/9555065","citation_count":22,"is_preprint":false},{"pmid":"7654194","id":"PMC_7654194","title":"Down-regulation of the G-proteins Gq alpha and G11 alpha by transfected human M3 muscarinic acetylcholine receptors in Chinese hamster ovary cells is independent of receptor down-regulation.","date":"1995","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/7654194","citation_count":22,"is_preprint":false},{"pmid":"8013389","id":"PMC_8013389","title":"Regulation by growth factors of angiotensin II type-1 receptor and the alpha subunit of Gq and G11 in bovine adrenal cells.","date":"1994","source":"Endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/8013389","citation_count":20,"is_preprint":false},{"pmid":"22580312","id":"PMC_22580312","title":"Isolation, purification, and characterization of a thermostable xylanase from a novel strain, Paenibacillus campinasensis G1-1.","date":"2012","source":"Journal of microbiology and biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/22580312","citation_count":19,"is_preprint":false},{"pmid":"38252411","id":"PMC_38252411","title":"STK19 is a DNA/RNA-binding protein critical for DNA damage repair and cell proliferation.","date":"2024","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/38252411","citation_count":15,"is_preprint":false},{"pmid":"33604750","id":"PMC_33604750","title":"Exopolysaccharide of Anoxybacillus pushchinoensis G11 has antitumor and antibiofilm activities.","date":"2021","source":"Archives of microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/33604750","citation_count":14,"is_preprint":false},{"pmid":"10722113","id":"PMC_10722113","title":"Hb Sallanches [alpha104(G11)Cys-->Tyr]: a rare alpha2-globin chain variant found in the homozygous state in three members of a Pakistani family.","date":"2000","source":"Hemoglobin","url":"https://pubmed.ncbi.nlm.nih.gov/10722113","citation_count":14,"is_preprint":false},{"pmid":"8947470","id":"PMC_8947470","title":"A constitutively active mutant of the alpha 1B-adrenergic receptor can cause greater agonist-dependent down-regulation of the G-proteins G9 alpha and G11 alpha than the wild-type receptor.","date":"1996","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/8947470","citation_count":13,"is_preprint":false},{"pmid":"18854320","id":"PMC_18854320","title":"Antagonistic regulation of neurite morphology through Gq/G11 and G12/G13.","date":"2008","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/18854320","citation_count":13,"is_preprint":false},{"pmid":"35677302","id":"PMC_35677302","title":"Extremophilic Bacterium Halomonas desertis G11 as a Cell Factory for Poly-3-Hydroxybutyrate-co-3-Hydroxyvalerate Copolymer's Production.","date":"2022","source":"Frontiers in bioengineering and biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/35677302","citation_count":12,"is_preprint":false},{"pmid":"10026232","id":"PMC_10026232","title":"Cellular and subcellular expression of Golf/Gs and Gq/G11 alpha-subunits in rat pancreatic endocrine cells.","date":"1999","source":"The journal of histochemistry and cytochemistry : official journal of the Histochemistry Society","url":"https://pubmed.ncbi.nlm.nih.gov/10026232","citation_count":12,"is_preprint":false},{"pmid":"24156378","id":"PMC_24156378","title":"Gq rather than G11 preferentially mediates nociceptor sensitization.","date":"2013","source":"Molecular pain","url":"https://pubmed.ncbi.nlm.nih.gov/24156378","citation_count":12,"is_preprint":false},{"pmid":"21751028","id":"PMC_21751028","title":"Distribution of anaerobic methane-oxidizing and sulfate-reducing communities in the G11 Nyegga pockmark, Norwegian Sea.","date":"2011","source":"Antonie van Leeuwenhoek","url":"https://pubmed.ncbi.nlm.nih.gov/21751028","citation_count":12,"is_preprint":false},{"pmid":"8038205","id":"PMC_8038205","title":"Concurrent specific immunological detection of both primate and rodent forms of the guanine nucleotide binding protein G11 alpha following their coexpression.","date":"1994","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/8038205","citation_count":11,"is_preprint":false},{"pmid":"16114179","id":"PMC_16114179","title":"Hb Oegstgeest [alpha104(G11)Cys-->Ser (alpha1)]. A new hemoglobin variant associated with a mild alpha-thalassemia phenotype.","date":"2005","source":"Hemoglobin","url":"https://pubmed.ncbi.nlm.nih.gov/16114179","citation_count":11,"is_preprint":false},{"pmid":"9467574","id":"PMC_9467574","title":"Absence of activating mutations of the genes encoding the alpha-subunits of G11 and Gq in thyroid neoplasia.","date":"1998","source":"The Journal of clinical endocrinology and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/9467574","citation_count":10,"is_preprint":false},{"pmid":"26467249","id":"PMC_26467249","title":"Studies on properties of the xylan‑binding domain and linker sequence of xylanase XynG1‑1 from Paenibacillus campinasensis G1‑1.","date":"2015","source":"Journal of industrial microbiology & biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/26467249","citation_count":10,"is_preprint":false},{"pmid":"11074558","id":"PMC_11074558","title":"Hb Johnstown [beta 109 (G11) Val-->Leu]: second case described and associated for 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announcements","url":"https://pubmed.ncbi.nlm.nih.gov/29074670","citation_count":6,"is_preprint":false},{"pmid":"15694379","id":"PMC_15694379","title":"Agonist-induced tyrosine phosphorylation of Gq/G11 alpha requires the intact structure of membrane domains.","date":"2005","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/15694379","citation_count":6,"is_preprint":false},{"pmid":"20703955","id":"PMC_20703955","title":"In vitro renaturation of alkaline family G/11 xylanase via a folding intermediate: alpha-crystallin facilitates refolding in an ATP-independent manner.","date":"2009","source":"Applied biochemistry and biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/20703955","citation_count":5,"is_preprint":false},{"pmid":"21235927","id":"PMC_21235927","title":"Specificity of G(q) and G(11) Protein Signaling in Vascular Myocytes.","date":"1998","source":"Trends in cardiovascular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/21235927","citation_count":5,"is_preprint":false},{"pmid":"10410308","id":"PMC_10410308","title":"Cholera toxin mediated regulation of the expression of Gq alpha and G11 alpha GTP binding proteins.","date":"1999","source":"Experimental & molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/10410308","citation_count":4,"is_preprint":false},{"pmid":"7762025","id":"PMC_7762025","title":"Alterations of brain levels of phosphoinositidase-C-linked Gq alpha/G11 alpha proteins and motor function in rats after cardiac arrest.","date":"1995","source":"Stroke","url":"https://pubmed.ncbi.nlm.nih.gov/7762025","citation_count":4,"is_preprint":false},{"pmid":"27154302","id":"PMC_27154302","title":"Cytotoxic activity of the novel heterocyclic compound G-11 is primarily mediated through intrinsic apoptotic pathway.","date":"2016","source":"Apoptosis : an international journal on programmed cell death","url":"https://pubmed.ncbi.nlm.nih.gov/27154302","citation_count":4,"is_preprint":false},{"pmid":"39550833","id":"PMC_39550833","title":"Gq/G11 oncogenic mutations promote PD-L1 expression and suppress tumor immunity.","date":"2024","source":"European journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/39550833","citation_count":3,"is_preprint":false},{"pmid":"41121307","id":"PMC_41121307","title":"CRISPR/Cas9 library screening reveals that STK19 has synergistic antitumor effects when combined with cisplatin on tongue squamous cell carcinoma.","date":"2025","source":"Journal of translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/41121307","citation_count":3,"is_preprint":false},{"pmid":"12410611","id":"PMC_12410611","title":"Identification of the 48-kDa G11 protein from guinea pig testes as sperad.","date":"2002","source":"The Journal of experimental zoology","url":"https://pubmed.ncbi.nlm.nih.gov/12410611","citation_count":3,"is_preprint":false},{"pmid":"40816687","id":"PMC_40816687","title":"Novel HN-AD bacterium G11: Deciphering the denitrification mechanism and nanoFe3O4 enhancement research.","date":"2025","source":"Environmental research","url":"https://pubmed.ncbi.nlm.nih.gov/40816687","citation_count":3,"is_preprint":false},{"pmid":"19958194","id":"PMC_19958194","title":"Hb Sallanches [alpha104(G11)Cys-->Tyr, TGC>TAC] occurs frequently on the Indian subcontinent.","date":"2009","source":"Hemoglobin","url":"https://pubmed.ncbi.nlm.nih.gov/19958194","citation_count":3,"is_preprint":false},{"pmid":"15358189","id":"PMC_15358189","title":"Computational analysis of responsible dipeptides for optimum pH in G/11 xylanase.","date":"2004","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/15358189","citation_count":3,"is_preprint":false},{"pmid":"39706162","id":"PMC_39706162","title":"Unlocking transcription-coupled DNA repair with the STK19 key.","date":"2024","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/39706162","citation_count":2,"is_preprint":false},{"pmid":"27348293","id":"PMC_27348293","title":"Investigating the expression of F10 and G11 xylanases in Aspergillus niger A09 with qPCR.","date":"2016","source":"Canadian journal of microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/27348293","citation_count":2,"is_preprint":false},{"pmid":"39827668","id":"PMC_39827668","title":"Protective effect and mechanism of plant-derived Lactobacillus G11 on septic myocardial injury.","date":"2025","source":"International immunopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/39827668","citation_count":2,"is_preprint":false},{"pmid":"36571675","id":"PMC_36571675","title":"Upgrading the accumulation of ginsenoside Rd in Panax notoginseng by a novel glycosidase-producing endophytic fungus G11-7.","date":"2022","source":"Folia microbiologica","url":"https://pubmed.ncbi.nlm.nih.gov/36571675","citation_count":2,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48996,"output_tokens":3610,"usd":0.100569,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10708,"output_tokens":2950,"usd":0.063645,"stage2_stop_reason":"end_turn"},"total_usd":0.164214,"stage1_batch_id":"msgbatch_01UT1AahFPCAyn2uVweS7A9z","stage2_batch_id":"msgbatch_01HuKWtKNT4Pqj1bc8eEP5RV","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking at the corpus, I need to identify which papers are about the canonical protein WHR1/G11/D6S60/TWH19/STK19 (a human MHC class III region gene encoding a nuclear serine/threonine kinase, later shown to be a winged-helix DNA-binding protein involved in TC-NER).\n\nPapers 12, 41, 42, 46, 47, 49, 50, 52, 53, 62, 76, 78, 81, 92, 97 are clearly about STK19/G11 (the MHC gene).\n\nPapers about Gq/G11 alpha subunits (GNA11) are a different gene (GNA11, not STK19/WHR1).\nPapers about rotavirus G11 serotypes, xylanase family G/11, hemoglobin variants, bacterial strains named G11, etc. are collisions.\n\nThe HGNC aliases listed are: G11, D6S60, TWH19, STK19 — these all refer to the MHC class III serine/threonine kinase gene, NOT GNA11. So Gq/G11 papers (1-4, 6-7, 9, 11, 13-18, 20-28, 30-31, 33-34, 36-40, 43-44, 56-57, 59-60, 65-66, 68-69, 71, 77, 85, 87-89, 91) are about GNA11, a completely different gene, and must be excluded.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1994,\n      \"finding\": \"The G11 gene in the human MHC class III region spans ~9.1 kb, is split into 7 exons, has a CpG island at its 5' end, and encodes protein products of 254 or 258 amino acids (due to differential splicing of two sites 12 bp apart at the end of exon 3). The encoded polypeptides share homology with human cytochrome P450XIB1 and the tyrosine kinase transforming protein from Fujinami virus.\",\n      \"method\": \"cDNA cloning, genomic sequencing, Northern blot, exon mapping\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct molecular characterization of gene structure and transcripts by cDNA/genomic cloning with sequencing in a single focused study\",\n      \"pmids\": [\"8012361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The G11 gene (MHC class III) encodes a Ser/Thr protein kinase of 41.5 kDa and 30 kDa isoforms. After immunoprecipitation from baculovirus-infected insect cells or transfected COS-7 cells, the immunoprecipitates displayed Mn2+-dependent kinase activity phosphorylating alpha-casein at Ser/Thr residues and histone at Ser residues. Mutation of the invariant lysine (K317P) in the putative ATP-binding site completely abolished kinase activity. The G11 polypeptide was covalently modified by the reactive ATP analogue 5'-p-fluorosulfonylbenzoyladenosine, and this modification was blocked by 1 mM ATP. Immunofluorescence of transfected COS-7 cells showed the kinase localizes predominantly to the nucleus.\",\n      \"method\": \"Baculovirus expression, immunoprecipitation kinase assay, active-site mutagenesis (K317P), ATP analogue labeling, immunofluorescence\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay with mutagenesis of catalytic residue and ATP-binding confirmation, but subsequent structural work challenges kinase interpretation; single lab\",\n      \"pmids\": [\"9812991\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"STK19 was reported to phosphorylate NRAS, enhancing its binding to downstream effectors and promoting oncogenic NRAS-driven melanocyte malignant transformation. A recurrent D89N substitution was described as a gain-of-function mutation that interacts better with NRAS. STK19D89N knockin mice showed skin hyperpigmentation and promoted NRASQ61R-driven melanomagenesis in vivo. A specific STK19 inhibitor (ZT-12-037-01) blocked NRAS-driven melanocyte transformation and melanoma growth.\",\n      \"method\": \"In vitro kinase assay, co-immunoprecipitation, knockin mouse model, pharmacological inhibition\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — findings disputed by subsequent papers (PMID 32531245) showing D89N is outside the coding region and STK19 is exclusively nuclear/chromatin-associated with no detectable kinase activity; confidence lowered accordingly\",\n      \"pmids\": [\"30712867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"STK19 was shown to be exclusively nuclear and chromatin-associated. The expressed protein is 110 amino acids shorter than indicated by databases (the 'cancer-driving' D89N substitution falls outside the coding region). No evidence for STK19 being a kinase was found; NRAS phosphorylation by STK19 could not be reproduced.\",\n      \"method\": \"Re-annotation of gene structure, subcellular localization (immunofluorescence, fractionation), independent kinase assays\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiments and independent kinase assays with gene re-annotation; multiple orthogonal approaches, single lab\",\n      \"pmids\": [\"32531245\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Crystal structure of human STK19 at 1.32 Å resolution revealed it does not contain a kinase domain, but rather three intimately packed winged helix (WH) domains. The third WH domain mediates homodimerization and double-stranded DNA binding; both activities are required for nuclear localization. STK19 binds dsDNA and dsRNA through the same positively charged interface centered on helix WH3-H1. STK19 participates in nucleotide excision repair (NER) and mismatch repair (MMR) by recruiting repair factors RPA2 and PCNA. Dimerization and DNA-binding mutants cannot rescue the slow proliferation phenotype of STK19-knockdown cells.\",\n      \"method\": \"X-ray crystallography (1.32 Å), mutagenesis, co-immunoprecipitation, DNA/RNA binding assays, knockdown with phenotypic rescue\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution crystal structure combined with mutagenesis, binding assays, and functional rescue experiments in a single rigorous study\",\n      \"pmids\": [\"38252411\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"STK19 is an essential factor for transcription-coupled nucleotide excision repair (TC-NER). Cryo-EM structure shows STK19 is an integral component of the RNA Pol II-TC-NER complex, bridging CSA, UVSSA, RNA Pol II, and downstream DNA. STK19 stimulates TC-NER complex stability and CRL4CSA ubiquitin ligase activity, resulting in efficient RNA Pol II ubiquitylation at RPB1-K1268 and correct UVSSA and TFIIH binding/recruitment.\",\n      \"method\": \"Cryo-EM structure, co-immunoprecipitation, ubiquitylation assays, loss-of-function (siRNA/KO) with repair and transcription restart readouts\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure combined with functional assays (ubiquitylation, TFIIH recruitment, repair) replicated across multiple concurrent independent studies\",\n      \"pmids\": [\"39547223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"STK19 is required for TC-NER and facilitates clearance of lesion-stalled RNA Pol II. Loss of STK19 does not impair initial TC-NER complex assembly or RNAPII ubiquitylation but delays RNAPII removal from lesion sites, blocking downstream repair. Cryo-EM and mutational analysis show STK19 positions itself between RNAPII, UVSSA, and CSA; molecular modeling suggests STK19 positions the ATPase subunits of TFIIH onto DNA ahead of RNAPII.\",\n      \"method\": \"Cryo-EM structure, genetic KO, live-cell imaging of RNAPII dynamics, mutational analysis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure with mutagenesis and functional genetic experiments, independently replicated in concurrent studies\",\n      \"pmids\": [\"39547229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"STK19 positions TFIIH for TC-NER via interaction with both CSA/RPB1 and the XPD subunit of TFIIH. Cell-free TC-NER reconstituted in frog egg extract showed that repair of a site-specific lesion-containing plasmid requires STK19, CSB, CRL4CSA, UVSSA, and ELOF1. A 1.9-Å cryo-EM structure shows STK19 binds the TC-NER complex through CSA and RPB1. Disruption of the predicted STK19-XPD interface impairs cell-free repair.\",\n      \"method\": \"Cell-free TC-NER reconstitution in Xenopus egg extract, cryo-EM (1.9 Å), AlphaFold interface prediction with mutagenesis validation\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of complete repair pathway, high-resolution cryo-EM structure, and interface mutagenesis confirming functional interaction with TFIIH\",\n      \"pmids\": [\"39547228\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"STK19 is recruited to DNA damage sites through direct interaction with CSA. STK19 can also interact with RNA Pol II directly in vitro. STK19 promotes UVSSA ubiquitination, which is required for TC-NER. STK19 also stimulates TFIIH recruitment independently of UVSSA ubiquitination through direct interaction with TFIIH.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding assay, ubiquitination assay, siRNA knockdown with TC-NER and unscheduled DNA synthesis readouts\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, in vitro binding, and functional ubiquitination/repair assays replicated across concurrent independent studies\",\n      \"pmids\": [\"39353615\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Cancer-associated mutations K186N, R200W, and R215W (found in cancer patients) map to a conserved positively charged patch on helix WH3-H1 and compromise STK19 dsDNA binding without disrupting protein folding. Mutations disrupting the nuclear localization signal (NLS) motif also impair DNA binding capacity indirectly by preventing nuclear entry.\",\n      \"method\": \"X-ray crystallography (1.32 Å), site-directed mutagenesis, electrophoretic mobility shift assay (EMSA)/DNA binding assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with mutagenesis and DNA binding assays identifying functionally relevant cancer mutations at the DNA-binding interface\",\n      \"pmids\": [\"38890355\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"STK19 inhibition depletes MGMT (O6-methylguanine-DNA methyltransferase) and enhances cisplatin-induced DNA damage in tongue squamous cell carcinoma cells, leading to synergistic cell killing in combination with cisplatin both in vitro and in vivo.\",\n      \"method\": \"CRISPR/Cas9 library screen, genetic and pharmacological STK19 inhibition, cisplatin combination assays in vitro and xenograft models\",\n      \"journal\": \"Journal of translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR screen with genetic and pharmacological validation and in vivo confirmation, single lab\",\n      \"pmids\": [\"41121307\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"STK19 (also known as G11/D6S60/TWH19) is a nuclear MHC class III region protein that, contrary to earlier reports of serine/threonine kinase activity, is structurally a tandem winged-helix (WH) domain protein that binds double-stranded DNA and RNA; it functions as an essential factor in transcription-coupled nucleotide excision repair (TC-NER) by being recruited to lesion-stalled RNA Pol II through direct interaction with CSA and RPB1, where it stabilizes the TC-NER complex, stimulates CRL4CSA-mediated ubiquitylation of RNA Pol II at K1268, promotes UVSSA ubiquitination, and positions TFIIH (via interaction with its XPD subunit) onto DNA ahead of RNA Pol II for lesion verification and downstream repair.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"STK19 (originally G11) is a nuclear, chromatin-associated factor essential for transcription-coupled nucleotide excision repair (TC-NER) [#5, #6]. Crystallography resolved it not as the serine/threonine kinase implied by early biochemical work but as a tandem winged-helix (WH) protein whose third WH domain mediates homodimerization and double-stranded DNA/RNA binding through a positively charged interface centered on helix WH3-H1; both dimerization and DNA binding are required for nuclear localization and for supporting cell proliferation [#4]. In TC-NER, STK19 is an integral component of the lesion-stalled RNA Pol II repair complex, recruited through direct interaction with CSA and able to bind RPB1/RNA Pol II directly, where it bridges CSA, UVSSA, RNA Pol II, and downstream DNA [#5, #8]. There it stabilizes the complex, stimulates CRL4CSA-mediated ubiquitylation of RNA Pol II at RPB1-K1268 and promotes UVSSA ubiquitination, and positions TFIIH—via interaction with its XPD subunit—onto DNA ahead of RNA Pol II to drive lesion verification and Pol II clearance [#5, #7, #8]. Cell-free reconstitution confirms STK19, alongside CSB, CRL4CSA, UVSSA, and ELOF1, is required for repair of a site-specific lesion [#7]. Earlier reports of STK19 kinase activity and of an oncogenic NRAS-phosphorylating role were not reproduced: STK19 is exclusively nuclear with no detectable kinase activity, and the purported cancer-driving D89N substitution falls outside the coding region [#3]. Cancer-associated mutations instead map to the WH3-H1 DNA-binding patch and compromise dsDNA binding without disrupting folding [#9].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Defining the genomic structure of the MHC class III G11 gene established it as a transcribed, alternatively spliced locus encoding a ~254-258 residue protein, providing the molecular starting point for functional study.\",\n      \"evidence\": \"cDNA cloning, genomic sequencing, and exon mapping of the human MHC class III region\",\n      \"pmids\": [\"8012361\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Function of the encoded protein undefined\", \"Homology calls to P450 and a viral tyrosine kinase were sequence-based, not functional\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"An attempt to assign biochemical activity reported G11/STK19 as a nuclear Mn2+-dependent Ser/Thr kinase, an interpretation later overturned but which fixed the protein's nuclear localization.\",\n      \"evidence\": \"Baculovirus/COS-7 expression, immunoprecipitation kinase assays, active-site K317P mutagenesis, ATP-analogue labeling, immunofluorescence\",\n      \"pmids\": [\"9812991\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Kinase activity not confirmed by later structural and biochemical work\", \"Physiological substrate never established\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"STK19 was advanced as an NRAS-phosphorylating kinase driving melanomagenesis, framing it as an oncogenic kinase and drug target—a model subsequently disputed.\",\n      \"evidence\": \"In vitro kinase assay, co-IP, D89N knockin mice, pharmacological inhibition (ZT-12-037-01)\",\n      \"pmids\": [\"30712867\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"NRAS phosphorylation by STK19 could not be reproduced\", \"D89N maps outside the protein coding region\", \"No kinase domain present in the protein structure\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Re-annotation and independent assays corrected the gene model and refuted the kinase paradigm, showing STK19 is exclusively nuclear/chromatin-associated and 110 residues shorter than databases indicated.\",\n      \"evidence\": \"Gene structure re-annotation, immunofluorescence/fractionation, independent kinase assays\",\n      \"pmids\": [\"32531245\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not yet define the true molecular activity\", \"Chromatin function unspecified\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"A 1.32-A crystal structure redefined STK19 as a tandem winged-helix protein, identifying WH3-mediated dimerization and a dsDNA/dsRNA-binding interface required for nuclear localization and proliferation.\",\n      \"evidence\": \"X-ray crystallography, mutagenesis, DNA/RNA binding assays, knockdown with phenotypic rescue; companion structure mapped cancer mutations to the WH3-H1 patch\",\n      \"pmids\": [\"38252411\", \"38890355\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Initial repair-factor links (RPA2, PCNA) less defined than the later TC-NER mechanism\", \"How DNA binding couples to specific repair steps not resolved here\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Cryo-EM and reconstitution established STK19 as an integral TC-NER factor that bridges CSA, UVSSA, RNA Pol II, and DNA to stimulate CRL4CSA ubiquitylation and TFIIH positioning, resolving its physiological role.\",\n      \"evidence\": \"Cryo-EM of the RNA Pol II-TC-NER complex (down to 1.9 A), cell-free TC-NER reconstitution in Xenopus egg extract, co-IP, ubiquitylation and repair/transcription-restart assays, XPD-interface mutagenesis\",\n      \"pmids\": [\"39547223\", \"39547229\", \"39547228\", \"39353615\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether STK19 acts solely structurally or contributes additional enzymatic chemistry unresolved\", \"Precise mechanism of TFIIH translocation ahead of Pol II based partly on modeling\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"STK19 inhibition was linked to MGMT depletion and cisplatin sensitization, connecting its repair function to a candidate therapeutic vulnerability in carcinoma.\",\n      \"evidence\": \"CRISPR/Cas9 screen, genetic and pharmacological STK19 inhibition with cisplatin combination in vitro and in xenografts\",\n      \"pmids\": [\"41121307\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic link between STK19 and MGMT levels not defined\", \"Tested in tongue squamous cell carcinoma context only\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved whether STK19's dsRNA binding and its broader chromatin/genome-maintenance roles extend beyond TC-NER, and how its DNA-binding interface is mechanistically coupled to lesion verification.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Function of dsRNA binding unknown\", \"Role in mismatch repair vs TC-NER not disentangled\", \"No catalytic activity assigned\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [4, 9]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [5, 6, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 3]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [3, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [5, 6, 7]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [5, 6]}\n    ],\n    \"complexes\": [\"RNA Pol II-TC-NER complex\"],\n    \"partners\": [\"CSA\", \"RPB1\", \"UVSSA\", \"XPD\", \"TFIIH\", \"RPA2\", \"PCNA\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}