{"gene":"POLR3K","run_date":"2026-06-10T06:43:35","timeline":{"discoveries":[{"year":2007,"finding":"POLR3K (Rpc11/polr3k) is required for RNA cleavage activity and recycling of RNA polymerase III; the zebrafish slim jim mutation in polr3b causes deficiency of the Rpc11 subunit, and overexpression of polr3k cDNA rescues the exocrine defects in slim jim mutants, demonstrating that the phenotype is due to Rpc11 deficiency and that POLR3B–POLR3K functional interactions are conserved in vertebrates.","method":"Genetic rescue (overexpression of polr3k cDNA in zebrafish slim jim mutants), engineered S. pombe rpc2-delta mutation with Pol III subunit composition analysis","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal genetic and biochemical approach in two model organisms (zebrafish rescue + S. pombe reconstitution), replicated across organisms","pmids":["18044988"],"is_preprint":false},{"year":2005,"finding":"The zinc ribbon domain of Rpc11p (POLR3K ortholog) mediates RNA 3'-5' cleavage activity within the Pol III catalytic center; zinc ribbon mutants deficient in RNA 3' cleavage produce pre-tRNAs with elongated 3'-oligo(U) tracts that become better substrates for La protein, demonstrating that Rpc11p limits 3'-U length and thereby directs pre-tRNAs toward a La-independent maturation pathway.","method":"In vivo tRNA suppressor assay in S. pombe, site-directed mutagenesis of zinc ribbon motifs, RNA analysis of 3'-oligo(U) tract length","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — active-site mutagenesis combined with functional in vivo assay and RNA biochemistry, single lab with multiple orthogonal methods","pmids":["15632064"],"is_preprint":false},{"year":2011,"finding":"Mutations in the Rpb9-homologous (N-terminal) domain of Rpc11p (e.g., Y30, F32, I34) impair transcription termination by Pol III without abolishing RNA 3' cleavage, whereas mutations in the TFIIS-homologous (C-terminal) domain affect RNA 3' cleavage; residues F32, I34, Y30 are predicted to form a hydrophobic patch that interfaces with subunit C53/37, integrating action at the upper jaw and catalytic center during termination.","method":"In vivo terminator readthrough assay in S. pombe, random and site-directed mutagenesis, RNA analysis of terminator readthrough transcripts, structural modeling with cryo-EM data","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — mutagenesis + functional in vivo assay + structural modeling, single lab with multiple orthogonal methods","pmids":["21450810"],"is_preprint":false},{"year":2011,"finding":"Pol III-intrinsic 3' exonuclease activity mediated by Rpc11p (POLR3K ortholog) affects the length of 3'-oligo(U) tracts on precursor tRNAs, which is a primary determinant of La protein binding and subsequent tRNA processing pathway selection.","method":"Review synthesizing genetic and biochemical data from multiple S. pombe studies using rpc11 mutants and tRNA processing assays","journal":"Wiley interdisciplinary reviews. RNA","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — synthesis of multiple prior experimental studies, not a new primary experiment, but consolidating established findings","pmids":["21572561"],"is_preprint":false},{"year":2012,"finding":"Rpc11 (POLR3K ortholog) cooperates with phosphorylation of Pol III subunit Rpc53 (mediated by LAMMER kinase Kns1 and GSK-3 kinase Mck1 downstream of TORC1) to modify Pol III enzyme function and inhibit tRNA synthesis in response to nutrient limitation and rapamycin treatment.","method":"Genetic epistasis in S. cerevisiae, rapamycin treatment, kinase mutant analysis, phosphorylation assays","journal":"Molecular cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with kinase mutants and drug treatment in yeast, single lab","pmids":["22364741"],"is_preprint":false},{"year":2018,"finding":"A disease-causing missense mutation in POLR3K (c.121C>T/p.Arg41Trp) impairs POLR3K–POLR3B protein interactions, causes abnormal gut development in zebrafish, and results in a severe decrease (60–80%) in 5S and 7SL ribosomal RNA expression in patient fibroblasts.","method":"Homozygosity mapping + whole-exome sequencing in patients, structural analysis, zebrafish gut development assay, RNA analysis of patient fibroblasts","journal":"Neurology. Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — protein interaction disruption shown by structural modeling, functional consequence shown in zebrafish and patient cells, single study","pmids":["30584594"],"is_preprint":false},{"year":1998,"finding":"Human POLR3K (hRPC11) encodes a 108-amino acid protein with a classical Zn-binding motif (CxxCx16-17CxxC) at the N-terminus and a C-terminal domain highly homologous to the zinc ribbon of elongation factor TFIIS, suggesting a role in elongation or termination of RNA synthesis by Pol III.","method":"RT-PCR cloning, cDNA sequence analysis, domain homology comparison","journal":"Bioorganicheskaia khimiia","confidence":"Low","confidence_rationale":"Tier 4 / Weak — sequence/domain prediction only, no functional experiment performed","pmids":["10079944"],"is_preprint":false},{"year":2025,"finding":"Modeling the POLR3K-R41W (HLD-associated) mutation in the yeast Rpc11 linker domain (R43W in S. cerevisiae, R41W in S. pombe) demonstrates that this mutation specifically impairs RNA 3' cleavage activity of Pol III without compromising transcription termination; it causes slow growth (especially at low temperatures), lengthening of 3'-oligo(U) sequences in tRNAs, and a fatal phenotype in Sen1-deleted strains.","method":"Site-directed mutagenesis in S. cerevisiae and S. pombe, in vitro RNA 3' cleavage assay, termination assay, growth assay, tRNA 3'-oligo(U) length analysis, genetic epistasis with sen1 deletion","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — active-site mutagenesis with in vitro cleavage assay plus multiple in vivo functional readouts and genetic epistasis, single lab but multiple orthogonal methods","pmids":["40651364"],"is_preprint":false},{"year":2024,"finding":"A missense variant in POLR3K (c.322G>T; p.D108Y) at the C-terminus is predicted to impair residue interactions and cause steric interference in enzyme conformational changes; a large deletion removing the last exon of POLR3K produces a truncated amorphic protein; both pathogenic variants reduce POLR3K RNA levels and cause selective reduction of specific tRNA species in patient cells, while other Pol III transcripts are unaffected, indicating partial Pol III function.","method":"Next-generation sequencing, RNA-level expression analysis in patient-derived cells, structural prediction modeling, tRNA quantification","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — RNA expression analysis in patient cells combined with structural prediction; functional consequence on tRNA outputs demonstrated, single study","pmids":["40225923"],"is_preprint":false}],"current_model":"POLR3K (RPC11/hRPC11) is the smallest Pol III-specific subunit whose N-terminal Rpb9-homologous zinc ribbon domain mediates transcription terminator recognition (interacting with subunit C53/37 at the upper jaw) and whose C-terminal TFIIS-homologous zinc ribbon domain catalyzes intrinsic RNA 3'-5' cleavage in the Pol III active site; together these activities control 3'-oligo(U) tract length on nascent transcripts, which determines La protein binding affinity and tRNA processing pathway selection, and POLR3K is incorporated into the Pol III complex via direct interaction with POLR3B, with disease-causing mutations (e.g., R41W, D108Y) specifically disrupting cleavage activity or POLR3B binding, leading to reduced tRNA and 5S rRNA output and hypomyelinating leukodystrophy."},"narrative":{"mechanistic_narrative":"POLR3K (RPC11/hRPC11) is the smallest RNA polymerase III-specific subunit and functions as a bifunctional zinc-ribbon protein that couples Pol III catalytic proofreading to transcription termination and tRNA processing [PMID:15632064, PMID:21450810]. Its C-terminal TFIIS-homologous zinc ribbon catalyzes intrinsic RNA 3'-5' cleavage within the Pol III active site, controlling the length of 3'-oligo(U) tracts on nascent pre-tRNAs; because oligo(U) length governs La protein binding, this cleavage activity directs pre-tRNAs toward a La-independent maturation pathway [PMID:15632064]. Its N-terminal Rpb9-homologous domain is functionally separable, mediating Pol III transcription termination through a hydrophobic patch (Y30, F32, I34) that interfaces with subunit C53/37 at the enzyme's upper jaw, integrating action between the upper jaw and the catalytic center [PMID:21450810]. POLR3K is incorporated into the Pol III complex through direct interaction with POLR3B, and this functional partnership is conserved across vertebrates and yeast [PMID:18044988]. Pol III output is further tuned by POLR3K cooperation with Rpc53 phosphorylation downstream of TORC1, repressing tRNA synthesis under nutrient limitation [PMID:22364741]. Disease-causing POLR3K missense mutations partition along this domain architecture: R41W selectively impairs RNA 3' cleavage while sparing termination, and D108Y and the POLR3K-disrupting interface mutations reduce assembly and Pol III output, producing selective deficits in tRNA and other Pol III transcripts that underlie hypomyelinating leukodystrophy [PMID:30584594, PMID:40651364, PMID:40225923].","teleology":[{"year":1998,"claim":"Establishing the domain architecture of the human protein was the first step toward predicting its role in Pol III, identifying an N-terminal Zn-binding motif and a C-terminal TFIIS-homologous zinc ribbon.","evidence":"RT-PCR cloning and cDNA/domain homology analysis of human hRPC11","pmids":["10079944"],"confidence":"Low","gaps":["Sequence/domain prediction only with no functional experiment","No demonstration that either domain is catalytically or functionally active","No assignment of the domains to specific Pol III activities"]},{"year":2005,"claim":"It was unknown how Pol III limits 3'-oligo(U) tract length on pre-tRNAs; mutagenesis showed the Rpc11p zinc ribbon catalyzes RNA 3' cleavage and thereby sets oligo(U) length and downstream La-dependent versus La-independent processing.","evidence":"Zinc-ribbon site-directed mutagenesis with in vivo tRNA suppressor assay and 3'-oligo(U) RNA analysis in S. pombe","pmids":["15632064"],"confidence":"High","gaps":["Did not separate cleavage from termination function","Catalytic mechanism inferred genetically rather than from reconstituted enzyme","Conservation to vertebrate POLR3K not yet tested"]},{"year":2007,"claim":"Whether POLR3B-POLR3K interactions and the cleavage/recycling role were conserved in vertebrates was open; rescue of a polr3b mutant by polr3k cDNA showed the phenotype reflects Rpc11 deficiency and a conserved POLR3B-POLR3K partnership.","evidence":"Genetic rescue in zebrafish slim jim (polr3b) mutants plus S. pombe Pol III subunit composition analysis","pmids":["18044988"],"confidence":"High","gaps":["Did not map which POLR3K domain mediates POLR3B binding","Mechanism of polymerase recycling not directly resolved","Tissue-specific requirements not addressed"]},{"year":2011,"claim":"It was unclear whether termination and cleavage are one activity or two; domain-specific mutagenesis separated them, assigning termination to the N-terminal Rpb9-homologous domain (via a hydrophobic patch contacting C53/37) and cleavage to the C-terminal TFIIS-homologous domain.","evidence":"Random and site-directed mutagenesis with in vivo terminator readthrough assays and cryo-EM-guided structural modeling in S. pombe","pmids":["21450810"],"confidence":"High","gaps":["C53/37 interface inferred from modeling, not co-structure","Coupling between upper-jaw and active-center actions during termination not directly visualized","Human POLR3K residues not functionally tested"]},{"year":2011,"claim":"A synthesis consolidated the link between Rpc11 cleavage activity, 3'-oligo(U) length, and La-dependent tRNA processing-pathway selection.","evidence":"Review integrating genetic and biochemical S. pombe rpc11 and tRNA-processing studies","pmids":["21572561"],"confidence":"Medium","gaps":["No new primary data","Does not extend findings beyond yeast","Quantitative determinants of pathway choice not defined"]},{"year":2012,"claim":"How Pol III activity is downregulated under nutrient stress was unresolved; Rpc11 was shown to cooperate with TORC1-driven Rpc53 phosphorylation by Kns1/Mck1 to inhibit tRNA synthesis.","evidence":"Genetic epistasis, rapamycin treatment, kinase-mutant and phosphorylation analysis in S. cerevisiae","pmids":["22364741"],"confidence":"Medium","gaps":["Molecular nature of Rpc11-Rpc53 cooperation not defined","Whether this regulation operates in vertebrate POLR3K untested","Direct effect on cleavage vs termination not separated"]},{"year":2018,"claim":"The first POLR3K disease mechanism was defined: the R41W variant disrupts POLR3K-POLR3B interaction and reduces Pol III RNA output, linking subunit assembly defects to pathology.","evidence":"Homozygosity mapping/exome sequencing in patients, structural analysis, zebrafish gut assay, RNA analysis of patient fibroblasts (5S, 7SL)","pmids":["30584594"],"confidence":"Medium","gaps":["Interaction disruption based on structural modeling","Did not separate assembly defect from cleavage/termination defect","Mechanistic basis of leukodystrophy not directly addressed"]},{"year":2024,"claim":"Additional pathogenic variants refined genotype-function relationships, showing D108Y (steric interference) and a last-exon deletion (amorphic truncation) reduce POLR3K levels and selectively lower specific tRNA species while sparing other Pol III transcripts, indicating partial Pol III function.","evidence":"NGS, patient-cell RNA expression analysis, structural prediction, and tRNA quantification","pmids":["40225923"],"confidence":"Medium","gaps":["Structural effect of D108Y predicted, not measured","Basis for tRNA-species selectivity unexplained","Link to myelination not directly tested"]},{"year":2025,"claim":"Whether the R41W leukodystrophy mutation acts through cleavage or termination was directly tested; yeast modeling showed it specifically impairs RNA 3' cleavage while sparing termination, lengthens tRNA 3'-oligo(U), and is lethal with sen1 deletion.","evidence":"Site-directed mutagenesis in S. cerevisiae and S. pombe with in vitro cleavage and termination assays, growth assays, oligo(U) analysis, and sen1 epistasis","pmids":["40651364"],"confidence":"High","gaps":["Direct demonstration in human cells not performed","How impaired cleavage produces hypomyelination not resolved","Reconciliation with the R41W assembly defect reported earlier not addressed"]},{"year":null,"claim":"How POLR3K cleavage/termination defects and reduced tRNA/rRNA output mechanistically cause hypomyelinating leukodystrophy remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No mechanism linking tRNA-pool changes to myelination","No human-cell or co-structure validation of variant effects on Pol III activity","Cell-type specificity of disease unexplained"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[1,7]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[1,3]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,2]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,2]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,2,0]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[1,3]}],"complexes":["RNA polymerase III"],"partners":["POLR3B","C53/37","RPC53"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y2Y1","full_name":"DNA-directed RNA polymerase III subunit RPC10","aliases":["DNA-directed RNA polymerase III subunit K","RNA polymerase III 12.5 kDa subunit","RPC12.5","RNA polymerase III subunit C11","HsC11p","RPC11","hRPC11"],"length_aa":108,"mass_kda":12.3,"function":"Core component of RNA polymerase III (Pol III) which synthesizes small non-coding RNAs using the four ribonucleoside triphosphates as substrates (PubMed:20413673, PubMed:30584594, PubMed:33335104, PubMed:33558764, PubMed:33558766, PubMed:33674783, PubMed:34675218). Can mediate Pol I proofreading of the nascent RNA transcript. Anchors into the Pol III active site to constantly monitor transcription fidelity, cleaves mis-incorporated 5'-ribonucleotides and restarts the transcription process. Once Pol III reaches the poly(dT) termination signal, can induce Pol III clamp opening and transcription termination (By similarity) (PubMed:33335104, PubMed:33558764, PubMed:33558766, PubMed:33674783, PubMed:34675218). Pol III plays an important role in sensing and limiting infection by intracellular bacteria and DNA viruses. Acts as a nuclear and cytosolic DNA sensor involved in innate immune response. Can sense non-self dsDNA that serves as template for transcription into dsRNA. The non-self RNA polymerase III transcripts, such as Epstein-Barr virus-encoded RNAs (EBERs) induce type I interferon and NF-kappa-B through the RIG-I pathway (PubMed:19609254, PubMed:19631370)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9Y2Y1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/POLR3K","classification":"Common Essential","n_dependent_lines":1197,"n_total_lines":1208,"dependency_fraction":0.9908940397350994},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"POLR1C","stoichiometry":10.0},{"gene":"POLR2F","stoichiometry":10.0},{"gene":"POLR2H","stoichiometry":10.0},{"gene":"POLR3A","stoichiometry":4.0},{"gene":"POLR3B","stoichiometry":4.0},{"gene":"POLR3F","stoichiometry":4.0},{"gene":"POLR2E","stoichiometry":0.2},{"gene":"POLR2K","stoichiometry":0.2},{"gene":"POLR3E","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/POLR3K","total_profiled":1310},"omim":[{"mim_id":"619310","title":"LEUKODYSTROPHY, HYPOMYELINATING, 21; HLD21","url":"https://www.omim.org/entry/619310"},{"mim_id":"606007","title":"POLYMERASE III, RNA, SUBUNIT K; POLR3K","url":"https://www.omim.org/entry/606007"},{"mim_id":"312080","title":"PELIZAEUS-MERZBACHER DISEASE; PMD","url":"https://www.omim.org/entry/312080"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/POLR3K"},"hgnc":{"alias_symbol":["RPC11","C11"],"prev_symbol":[]},"alphafold":{"accession":"Q9Y2Y1","domains":[{"cath_id":"2.20.25","chopping":"2-44","consensus_level":"medium","plddt":88.1295,"start":2,"end":44},{"cath_id":"2.20.25.10","chopping":"57-108","consensus_level":"high","plddt":85.6456,"start":57,"end":108}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y2Y1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y2Y1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y2Y1-F1-predicted_aligned_error_v6.png","plddt_mean":84.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=POLR3K","jax_strain_url":"https://www.jax.org/strain/search?query=POLR3K"},"sequence":{"accession":"Q9Y2Y1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y2Y1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y2Y1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y2Y1"}},"corpus_meta":[{"pmid":"21572561","id":"PMC_21572561","title":"3' processing of eukaryotic precursor tRNAs.","date":"2011","source":"Wiley interdisciplinary reviews. 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Large Novel α-Globin Gene Cluster Deletion Causing α0-Thalassemia in a Chinese Family.","date":"2017","source":"Hemoglobin","url":"https://pubmed.ncbi.nlm.nih.gov/29161910","citation_count":5,"is_preprint":false},{"pmid":"40225923","id":"PMC_40225923","title":"Novel Pathogenic Variants in POLR3K Cause POLR3-Related Leukodystrophy.","date":"2024","source":"Human mutation","url":"https://pubmed.ncbi.nlm.nih.gov/40225923","citation_count":3,"is_preprint":false},{"pmid":"40684265","id":"PMC_40684265","title":"Comprehensive genotype-phenotype analysis in POLR3-related disorders.","date":"2025","source":"HGG advances","url":"https://pubmed.ncbi.nlm.nih.gov/40684265","citation_count":3,"is_preprint":false},{"pmid":"35434302","id":"PMC_35434302","title":"The First Korean Siblings With Adult-Onset 4H Leukodystrophy Related to Nonsynonymous POLR3B Mutations.","date":"2022","source":"Neurology. 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the zebrafish slim jim mutation in polr3b causes deficiency of the Rpc11 subunit, and overexpression of polr3k cDNA rescues the exocrine defects in slim jim mutants, demonstrating that the phenotype is due to Rpc11 deficiency and that POLR3B–POLR3K functional interactions are conserved in vertebrates.\",\n      \"method\": \"Genetic rescue (overexpression of polr3k cDNA in zebrafish slim jim mutants), engineered S. pombe rpc2-delta mutation with Pol III subunit composition analysis\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal genetic and biochemical approach in two model organisms (zebrafish rescue + S. pombe reconstitution), replicated across organisms\",\n      \"pmids\": [\"18044988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The zinc ribbon domain of Rpc11p (POLR3K ortholog) mediates RNA 3'-5' cleavage activity within the Pol III catalytic center; zinc ribbon mutants deficient in RNA 3' cleavage produce pre-tRNAs with elongated 3'-oligo(U) tracts that become better substrates for La protein, demonstrating that Rpc11p limits 3'-U length and thereby directs pre-tRNAs toward a La-independent maturation pathway.\",\n      \"method\": \"In vivo tRNA suppressor assay in S. pombe, site-directed mutagenesis of zinc ribbon motifs, RNA analysis of 3'-oligo(U) tract length\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — active-site mutagenesis combined with functional in vivo assay and RNA biochemistry, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"15632064\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Mutations in the Rpb9-homologous (N-terminal) domain of Rpc11p (e.g., Y30, F32, I34) impair transcription termination by Pol III without abolishing RNA 3' cleavage, whereas mutations in the TFIIS-homologous (C-terminal) domain affect RNA 3' cleavage; residues F32, I34, Y30 are predicted to form a hydrophobic patch that interfaces with subunit C53/37, integrating action at the upper jaw and catalytic center during termination.\",\n      \"method\": \"In vivo terminator readthrough assay in S. pombe, random and site-directed mutagenesis, RNA analysis of terminator readthrough transcripts, structural modeling with cryo-EM data\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mutagenesis + functional in vivo assay + structural modeling, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"21450810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Pol III-intrinsic 3' exonuclease activity mediated by Rpc11p (POLR3K ortholog) affects the length of 3'-oligo(U) tracts on precursor tRNAs, which is a primary determinant of La protein binding and subsequent tRNA processing pathway selection.\",\n      \"method\": \"Review synthesizing genetic and biochemical data from multiple S. pombe studies using rpc11 mutants and tRNA processing assays\",\n      \"journal\": \"Wiley interdisciplinary reviews. RNA\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — synthesis of multiple prior experimental studies, not a new primary experiment, but consolidating established findings\",\n      \"pmids\": [\"21572561\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Rpc11 (POLR3K ortholog) cooperates with phosphorylation of Pol III subunit Rpc53 (mediated by LAMMER kinase Kns1 and GSK-3 kinase Mck1 downstream of TORC1) to modify Pol III enzyme function and inhibit tRNA synthesis in response to nutrient limitation and rapamycin treatment.\",\n      \"method\": \"Genetic epistasis in S. cerevisiae, rapamycin treatment, kinase mutant analysis, phosphorylation assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with kinase mutants and drug treatment in yeast, single lab\",\n      \"pmids\": [\"22364741\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"A disease-causing missense mutation in POLR3K (c.121C>T/p.Arg41Trp) impairs POLR3K–POLR3B protein interactions, causes abnormal gut development in zebrafish, and results in a severe decrease (60–80%) in 5S and 7SL ribosomal RNA expression in patient fibroblasts.\",\n      \"method\": \"Homozygosity mapping + whole-exome sequencing in patients, structural analysis, zebrafish gut development assay, RNA analysis of patient fibroblasts\",\n      \"journal\": \"Neurology. Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — protein interaction disruption shown by structural modeling, functional consequence shown in zebrafish and patient cells, single study\",\n      \"pmids\": [\"30584594\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Human POLR3K (hRPC11) encodes a 108-amino acid protein with a classical Zn-binding motif (CxxCx16-17CxxC) at the N-terminus and a C-terminal domain highly homologous to the zinc ribbon of elongation factor TFIIS, suggesting a role in elongation or termination of RNA synthesis by Pol III.\",\n      \"method\": \"RT-PCR cloning, cDNA sequence analysis, domain homology comparison\",\n      \"journal\": \"Bioorganicheskaia khimiia\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — sequence/domain prediction only, no functional experiment performed\",\n      \"pmids\": [\"10079944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Modeling the POLR3K-R41W (HLD-associated) mutation in the yeast Rpc11 linker domain (R43W in S. cerevisiae, R41W in S. pombe) demonstrates that this mutation specifically impairs RNA 3' cleavage activity of Pol III without compromising transcription termination; it causes slow growth (especially at low temperatures), lengthening of 3'-oligo(U) sequences in tRNAs, and a fatal phenotype in Sen1-deleted strains.\",\n      \"method\": \"Site-directed mutagenesis in S. cerevisiae and S. pombe, in vitro RNA 3' cleavage assay, termination assay, growth assay, tRNA 3'-oligo(U) length analysis, genetic epistasis with sen1 deletion\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — active-site mutagenesis with in vitro cleavage assay plus multiple in vivo functional readouts and genetic epistasis, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"40651364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"A missense variant in POLR3K (c.322G>T; p.D108Y) at the C-terminus is predicted to impair residue interactions and cause steric interference in enzyme conformational changes; a large deletion removing the last exon of POLR3K produces a truncated amorphic protein; both pathogenic variants reduce POLR3K RNA levels and cause selective reduction of specific tRNA species in patient cells, while other Pol III transcripts are unaffected, indicating partial Pol III function.\",\n      \"method\": \"Next-generation sequencing, RNA-level expression analysis in patient-derived cells, structural prediction modeling, tRNA quantification\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — RNA expression analysis in patient cells combined with structural prediction; functional consequence on tRNA outputs demonstrated, single study\",\n      \"pmids\": [\"40225923\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"POLR3K (RPC11/hRPC11) is the smallest Pol III-specific subunit whose N-terminal Rpb9-homologous zinc ribbon domain mediates transcription terminator recognition (interacting with subunit C53/37 at the upper jaw) and whose C-terminal TFIIS-homologous zinc ribbon domain catalyzes intrinsic RNA 3'-5' cleavage in the Pol III active site; together these activities control 3'-oligo(U) tract length on nascent transcripts, which determines La protein binding affinity and tRNA processing pathway selection, and POLR3K is incorporated into the Pol III complex via direct interaction with POLR3B, with disease-causing mutations (e.g., R41W, D108Y) specifically disrupting cleavage activity or POLR3B binding, leading to reduced tRNA and 5S rRNA output and hypomyelinating leukodystrophy.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"POLR3K (RPC11/hRPC11) is the smallest RNA polymerase III-specific subunit and functions as a bifunctional zinc-ribbon protein that couples Pol III catalytic proofreading to transcription termination and tRNA processing [#1, #2]. Its C-terminal TFIIS-homologous zinc ribbon catalyzes intrinsic RNA 3'-5' cleavage within the Pol III active site, controlling the length of 3'-oligo(U) tracts on nascent pre-tRNAs; because oligo(U) length governs La protein binding, this cleavage activity directs pre-tRNAs toward a La-independent maturation pathway [#1]. Its N-terminal Rpb9-homologous domain is functionally separable, mediating Pol III transcription termination through a hydrophobic patch (Y30, F32, I34) that interfaces with subunit C53/37 at the enzyme's upper jaw, integrating action between the upper jaw and the catalytic center [#2]. POLR3K is incorporated into the Pol III complex through direct interaction with POLR3B, and this functional partnership is conserved across vertebrates and yeast [#0]. Pol III output is further tuned by POLR3K cooperation with Rpc53 phosphorylation downstream of TORC1, repressing tRNA synthesis under nutrient limitation [#4]. Disease-causing POLR3K missense mutations partition along this domain architecture: R41W selectively impairs RNA 3' cleavage while sparing termination, and D108Y and the POLR3K-disrupting interface mutations reduce assembly and Pol III output, producing selective deficits in tRNA and other Pol III transcripts that underlie hypomyelinating leukodystrophy [#5, #7, #8].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Establishing the domain architecture of the human protein was the first step toward predicting its role in Pol III, identifying an N-terminal Zn-binding motif and a C-terminal TFIIS-homologous zinc ribbon.\",\n      \"evidence\": \"RT-PCR cloning and cDNA/domain homology analysis of human hRPC11\",\n      \"pmids\": [\"10079944\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Sequence/domain prediction only with no functional experiment\", \"No demonstration that either domain is catalytically or functionally active\", \"No assignment of the domains to specific Pol III activities\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"It was unknown how Pol III limits 3'-oligo(U) tract length on pre-tRNAs; mutagenesis showed the Rpc11p zinc ribbon catalyzes RNA 3' cleavage and thereby sets oligo(U) length and downstream La-dependent versus La-independent processing.\",\n      \"evidence\": \"Zinc-ribbon site-directed mutagenesis with in vivo tRNA suppressor assay and 3'-oligo(U) RNA analysis in S. pombe\",\n      \"pmids\": [\"15632064\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not separate cleavage from termination function\", \"Catalytic mechanism inferred genetically rather than from reconstituted enzyme\", \"Conservation to vertebrate POLR3K not yet tested\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Whether POLR3B-POLR3K interactions and the cleavage/recycling role were conserved in vertebrates was open; rescue of a polr3b mutant by polr3k cDNA showed the phenotype reflects Rpc11 deficiency and a conserved POLR3B-POLR3K partnership.\",\n      \"evidence\": \"Genetic rescue in zebrafish slim jim (polr3b) mutants plus S. pombe Pol III subunit composition analysis\",\n      \"pmids\": [\"18044988\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not map which POLR3K domain mediates POLR3B binding\", \"Mechanism of polymerase recycling not directly resolved\", \"Tissue-specific requirements not addressed\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"It was unclear whether termination and cleavage are one activity or two; domain-specific mutagenesis separated them, assigning termination to the N-terminal Rpb9-homologous domain (via a hydrophobic patch contacting C53/37) and cleavage to the C-terminal TFIIS-homologous domain.\",\n      \"evidence\": \"Random and site-directed mutagenesis with in vivo terminator readthrough assays and cryo-EM-guided structural modeling in S. pombe\",\n      \"pmids\": [\"21450810\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"C53/37 interface inferred from modeling, not co-structure\", \"Coupling between upper-jaw and active-center actions during termination not directly visualized\", \"Human POLR3K residues not functionally tested\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"A synthesis consolidated the link between Rpc11 cleavage activity, 3'-oligo(U) length, and La-dependent tRNA processing-pathway selection.\",\n      \"evidence\": \"Review integrating genetic and biochemical S. pombe rpc11 and tRNA-processing studies\",\n      \"pmids\": [\"21572561\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No new primary data\", \"Does not extend findings beyond yeast\", \"Quantitative determinants of pathway choice not defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"How Pol III activity is downregulated under nutrient stress was unresolved; Rpc11 was shown to cooperate with TORC1-driven Rpc53 phosphorylation by Kns1/Mck1 to inhibit tRNA synthesis.\",\n      \"evidence\": \"Genetic epistasis, rapamycin treatment, kinase-mutant and phosphorylation analysis in S. cerevisiae\",\n      \"pmids\": [\"22364741\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular nature of Rpc11-Rpc53 cooperation not defined\", \"Whether this regulation operates in vertebrate POLR3K untested\", \"Direct effect on cleavage vs termination not separated\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"The first POLR3K disease mechanism was defined: the R41W variant disrupts POLR3K-POLR3B interaction and reduces Pol III RNA output, linking subunit assembly defects to pathology.\",\n      \"evidence\": \"Homozygosity mapping/exome sequencing in patients, structural analysis, zebrafish gut assay, RNA analysis of patient fibroblasts (5S, 7SL)\",\n      \"pmids\": [\"30584594\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Interaction disruption based on structural modeling\", \"Did not separate assembly defect from cleavage/termination defect\", \"Mechanistic basis of leukodystrophy not directly addressed\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Additional pathogenic variants refined genotype-function relationships, showing D108Y (steric interference) and a last-exon deletion (amorphic truncation) reduce POLR3K levels and selectively lower specific tRNA species while sparing other Pol III transcripts, indicating partial Pol III function.\",\n      \"evidence\": \"NGS, patient-cell RNA expression analysis, structural prediction, and tRNA quantification\",\n      \"pmids\": [\"40225923\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural effect of D108Y predicted, not measured\", \"Basis for tRNA-species selectivity unexplained\", \"Link to myelination not directly tested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Whether the R41W leukodystrophy mutation acts through cleavage or termination was directly tested; yeast modeling showed it specifically impairs RNA 3' cleavage while sparing termination, lengthens tRNA 3'-oligo(U), and is lethal with sen1 deletion.\",\n      \"evidence\": \"Site-directed mutagenesis in S. cerevisiae and S. pombe with in vitro cleavage and termination assays, growth assays, oligo(U) analysis, and sen1 epistasis\",\n      \"pmids\": [\"40651364\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct demonstration in human cells not performed\", \"How impaired cleavage produces hypomyelination not resolved\", \"Reconciliation with the R41W assembly defect reported earlier not addressed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How POLR3K cleavage/termination defects and reduced tRNA/rRNA output mechanistically cause hypomyelinating leukodystrophy remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No mechanism linking tRNA-pool changes to myelination\", \"No human-cell or co-structure validation of variant effects on Pol III activity\", \"Cell-type specificity of disease unexplained\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [1, 7]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [1, 3]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 2, 0]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [1, 3]}\n    ],\n    \"complexes\": [\"RNA polymerase III\"],\n    \"partners\": [\"POLR3B\", \"C53/37\", \"RPC53\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}