{"gene":"ELP6","run_date":"2026-04-28T17:46:03","timeline":{"discoveries":[{"year":2001,"finding":"ELP6 (TOT6) is one of three subunits forming the Elp4/5/6 subcomplex (HAP) of the six-subunit holo-Elongator complex; the full complex can be separated into two subcomplexes: Elp1/2/3 and Elp4/5/6, each purified by TAP of any individual subunit.","method":"Tandem affinity purification (TAP), biochemical fractionation, genetic disruption with phenotypic analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal TAP purification replicated in two independent labs (Krogan/Greenblatt and Winkler/Svejstrup)","pmids":["11689709","11435442"],"is_preprint":false},{"year":2001,"finding":"Disruption of ELP6 (TOT6) confers resistance to K. lactis zymocin, thermosensitivity, slow growth, and hypersensitivity to drugs, phenotypes identical to other elp mutants, establishing ELP6 as functionally integral to the Elongator/TOT complex.","method":"Gene deletion, phenotypic analysis (zymocin resistance, growth assays)","journal":"Molecular microbiology","confidence":"High","confidence_rationale":"Tier 2 — consistent phenotypic results across multiple labs","pmids":["11737649","11689709","11435442"],"is_preprint":false},{"year":2002,"finding":"The three smallest Elongator subunits Elp4, Elp5, and Elp6 are required for the histone acetyltransferase (HAT) activity of the intact Elongator complex toward histone H3 (K14) and H4 (K8), including nucleosomal substrates.","method":"In vitro HAT assay with purified complex from elp4, elp5, elp6 deletion strains; chromatin immunoprecipitation","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — in vitro enzymatic assay with defined subunit deletions plus in vivo ChIP validation","pmids":["11904415"],"is_preprint":false},{"year":2002,"finding":"Structural integrity of the Elp4/5/6 (HAP) subcomplex requires ELP6; deletion of elp6 abolishes the interaction between Elp5 and Elp2, and disrupts association of the HAP subcomplex with core Elongator (Elp1/2/3).","method":"Co-immunoprecipitation, subunit interaction mapping in deletion strains","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP with multiple subunit pairs tested in elp6 deletion background","pmids":["12424236"],"is_preprint":false},{"year":2005,"finding":"ELP6, along with ELP1–ELP5 and KTI11–KTI13, is required for an early step in the synthesis of the mcm5 and ncm5 modifications on wobble uridines in tRNA; tRNA immunoprecipitation showed direct association of Elongator subunits with tRNA substrates.","method":"Analysis of modified nucleosides in individual tRNA species by HPLC; tRNA immunoprecipitation (RIP)","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1/2 — direct tRNA modification measurement plus RIP, replicated across multiple Elongator subunit mutants","pmids":["15769872"],"is_preprint":false},{"year":2006,"finding":"The tRNA modification (mcm5 group formation) function of Elongator, requiring ELP6 among other subunits, accounts for its roles in transcriptional elongation and polarized exocytosis phenotypes, as elevated expression of two tRNA species suppresses all these phenotypes in Elongator-deficient cells.","method":"Genetic suppression by tRNA overexpression; phenotypic rescue assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 — epistasis via genetic suppression with multiple phenotypes tested, clear mechanistic conclusion","pmids":["17018299"],"is_preprint":false},{"year":2012,"finding":"The yeast Elp4/5/6 subcomplex forms a heterohexameric ring-like structure in which each subunit adopts a RecA-like ATPase fold; the hexameric Elp456 ring binds tRNAs in an ATP-regulated manner, directly supporting the role of Elongator in tRNA modification.","method":"X-ray crystallography; in vitro tRNA-binding assays; ATP-regulation assays; site-directed mutagenesis","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 — crystal structure plus in vitro functional assays with mutagenesis","pmids":["22343726"],"is_preprint":false},{"year":2012,"finding":"Crystal structure of the yeast Elp4-6 subcomplex shows that Elp6 acts as a structural bridge assembling Elp4 and Elp5; each subunit has a RecA-ATPase-like fold; the hexameric ring assembly is required for specific histone H3 binding as shown by GST pulldown and mutagenesis.","method":"X-ray crystallography; site-directed mutagenesis; GST pulldown; biochemical assembly assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — crystal structure plus mutagenesis and pulldown assays","pmids":["22556426"],"is_preprint":false},{"year":2012,"finding":"Human ELP6 (C3ORF75) is identified as a bona fide subunit of human Elongator; ELP5 (DERP6) is required for complex integrity and directly connects ELP3 to ELP4; depletion of ELP6 impairs migration, invasion, and tumorigenicity of melanoma cells.","method":"Biochemical co-purification; RNAi knockdown; cell migration/invasion assays; tumorigenicity assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — biochemical identification plus multiple functional cellular assays in human cells","pmids":["22854966"],"is_preprint":false},{"year":2016,"finding":"Full yeast Elongator adopts a bilobal, asymmetric architecture (~850 kDa) with the hexameric Elp456 subassembly anchored to one of the two Elp123 lobes; single-particle EM combined with cross-linking mass spectrometry placed ELP6 within this overall architecture.","method":"Single-particle electron microscopy; cross-linking coupled to mass spectrometry; molecular modeling","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1/2 — EM structure integrated with XL-MS restraints","pmids":["27872205"],"is_preprint":false},{"year":2022,"finding":"Patient-derived missense mutations in human ELP6 impair tRNA modification activity of the Elongator complex in vitro and in human and murine cells; structural determination of human and murine Elp456 locates mutated residues; modeling pathogenic ELP6 variants in mice recapitulates neurological defects (developmental delay, epilepsy, motor dysfunction) distinct from those caused by Elp123 mutations.","method":"Cryo-EM/crystal structure of human/murine Elp456; in vitro tRNA modification assay; HPLC-MS tRNA modification analysis in patient cells; mouse modeling","journal":"EMBO molecular medicine","confidence":"High","confidence_rationale":"Tier 1 — structure plus in vitro and in vivo tRNA modification assays plus mouse modeling; multiple orthogonal methods","pmids":["35698786"],"is_preprint":false},{"year":2022,"finding":"In human Elongator assembly, hELP4/5/6 is recruited to hELP1/2/3 via hELP3; hELP1 stabilizes hELP3; hELP2 enhances integrity and substrate-binding ability of the dimeric hELP1/2/3; ELP6 is part of the peripheral subcomplex.","method":"Co-purification of recombinant human subunits; pulldown assays; single-particle electron microscopy","journal":"ACS omega","confidence":"Medium","confidence_rationale":"Tier 2 — co-purification and EM, single lab","pmids":["35128251"],"is_preprint":false},{"year":2013,"finding":"Human ELP6 protein (~30 kDa) is expressed intracellularly in developing and mature granulocytes (neutrophils, eosinophils) and monocytes in human bone marrow, but not in lymphocytes or erythrocytes.","method":"Western blot; flow cytometry with monoclonal antibody; RT-PCR","journal":"Human antibodies","confidence":"Medium","confidence_rationale":"Tier 2 — direct protein localization by flow cytometry and western blot, single lab","pmids":["24284306"],"is_preprint":false},{"year":2024,"finding":"Arabidopsis ELP4 interacts directly with ELP6 but not directly with ELP5 in vivo, and ELP6 acts as a structural bridge in the AtELP456 heterotrimer, a configuration structurally conserved with yeast Elp456 despite low sequence homology.","method":"In vivo protein-protein interaction assays (yeast two-hybrid / co-IP in planta); structural prediction and comparative analysis","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2/3 — in vivo interaction data plus structural comparison, single lab","pmids":["38673955"],"is_preprint":false},{"year":2025,"finding":"ELP6 knockdown in melanoma cells causes G1 phase cell cycle arrest, reduced cell viability, decreased p42 MAPK expression, and reduced responsiveness to the MEK1/2 inhibitor U0126, placing ELP6 function upstream of the ERK1/2 signalling pathway.","method":"shRNA knockdown; flow cytometry cell cycle analysis; western blot for ERK pathway components; pharmacological inhibitor assays","journal":"Oncology letters","confidence":"Medium","confidence_rationale":"Tier 3 — KD with cellular phenotype and pathway readout, single lab","pmids":["40177137"],"is_preprint":false}],"current_model":"ELP6 is the sixth subunit of the evolutionarily conserved, ~850 kDa Elongator complex, where it forms part of the Elp4/5/6 hexameric RecA-like ATPase subcomplex that bridges to the catalytic Elp1/2/3 subcomplex; within this subcomplex ELP6 acts as a structural bridge connecting ELP4 and ELP5, and the intact Elp456 ring is required for ATP-regulated tRNA binding, the mcm5/ncm5 wobble uridine modification activity that underlies Elongator's roles in translation efficiency, neuronal development, and cell migration, as well as for the HAT activity of holo-Elongator toward histones H3 and H4."},"narrative":{"teleology":[{"year":2001,"claim":"Establishing that ELP6 is part of a distinct three-subunit subcomplex (Elp4/5/6) within a six-subunit Elongator resolved the modular architecture of the complex and placed ELP6 as a separable functional unit.","evidence":"Tandem affinity purification and biochemical fractionation in yeast, replicated across two independent labs","pmids":["11689709","11435442"],"confidence":"High","gaps":["No structural information on ELP6 or the Elp456 subcomplex","Enzymatic activity of each subcomplex undefined"]},{"year":2001,"claim":"Demonstrating that ELP6 deletion phenocopied all other Elongator subunit deletions (zymocin resistance, thermosensitivity, slow growth) established it as functionally integral rather than peripheral.","evidence":"Gene deletion and phenotypic analysis in yeast across multiple labs","pmids":["11737649","11689709"],"confidence":"High","gaps":["Molecular function of ELP6 within the complex unknown","Whether phenotypes reflect tRNA modification, HAT activity, or other functions unresolved"]},{"year":2002,"claim":"Showing that Elp4/5/6 subunits are required for the HAT activity of holo-Elongator identified the subcomplex as an essential regulatory or structural cofactor for catalysis, and revealed that ELP6 deletion disrupts the Elp456–Elp123 interaction.","evidence":"In vitro HAT assays on free and nucleosomal histones with subunit deletion strains; co-immunoprecipitation mapping","pmids":["11904415","12424236"],"confidence":"High","gaps":["Whether Elp456 directly contacts substrate or allosterically activates Elp3 unknown","Structural basis for ELP6's bridging role undefined"]},{"year":2005,"claim":"Identifying ELP6 as required for mcm5/ncm5 wobble uridine tRNA modification established a direct molecular function for Elongator beyond chromatin, with tRNA immunoprecipitation showing Elongator–tRNA association.","evidence":"HPLC analysis of modified nucleosides in individual tRNAs from elp mutants; tRNA immunoprecipitation","pmids":["15769872"],"confidence":"High","gaps":["Whether ELP6 directly contacts tRNA unknown","Relative contributions of tRNA modification vs. HAT activity to cellular phenotypes unresolved"]},{"year":2006,"claim":"Genetic suppression of Elongator-deficient phenotypes by tRNA overexpression demonstrated that tRNA modification is the primary cellular function underlying transcriptional elongation and exocytosis phenotypes, unifying disparate roles.","evidence":"tRNA overexpression rescue of multiple elp mutant phenotypes in yeast","pmids":["17018299"],"confidence":"High","gaps":["Whether HAT activity has any tRNA-independent role remains unresolved","Mechanism by which specific tRNA modifications affect exocytosis not defined"]},{"year":2012,"claim":"Crystal structures of yeast Elp456 revealed a heterohexameric ring with RecA-like ATPase folds, showed ELP6 acts as the structural bridge connecting ELP4 and ELP5, and demonstrated ATP-regulated tRNA binding by the ring, providing the first mechanistic framework for substrate engagement.","evidence":"X-ray crystallography; in vitro tRNA-binding and ATP-regulation assays; site-directed mutagenesis; GST pulldown for histone H3 binding","pmids":["22343726","22556426"],"confidence":"High","gaps":["Whether ATP is hydrolyzed or only bound is unclear","How tRNA is handed off from Elp456 to the catalytic Elp3 active site unknown"]},{"year":2012,"claim":"Identification of human ELP6 (C3ORF75) as a bona fide human Elongator subunit extended findings to mammalian biology and showed ELP6 depletion impairs melanoma cell migration and tumorigenicity.","evidence":"Biochemical co-purification of human subunits; RNAi knockdown with migration, invasion, and tumorigenicity assays in melanoma cells","pmids":["22854966"],"confidence":"High","gaps":["Whether migration defects are tRNA-modification-dependent or reflect an independent function not tested","Signaling pathways downstream of ELP6 in cancer cells uncharacterized"]},{"year":2016,"claim":"Single-particle EM of full yeast Elongator placed the Elp456 hexamer on one of the two Elp123 lobes within a bilobal ~850 kDa asymmetric architecture, establishing the spatial relationship between the regulatory and catalytic subcomplexes.","evidence":"Single-particle electron microscopy with cross-linking mass spectrometry restraints","pmids":["27872205"],"confidence":"High","gaps":["Resolution insufficient for atomic-level subunit interfaces","How asymmetry relates to catalytic mechanism unknown"]},{"year":2022,"claim":"Patient-derived ELP6 missense mutations were shown to impair tRNA modification both in vitro and in patient cells, and mouse modeling recapitulated a neurodevelopmental syndrome with epilepsy and motor defects, establishing ELP6 as a disease gene with a mechanism distinct from Elp123 mutations.","evidence":"Cryo-EM/crystal structure of human/murine Elp456; in vitro tRNA modification assay; HPLC-MS in patient cells; mouse modeling","pmids":["35698786"],"confidence":"High","gaps":["Whether all pathogenic ELP6 variants act through the same mechanism unknown","Neuronal cell-type-specific consequences of tRNA hypomodification not resolved"]},{"year":2025,"claim":"ELP6 knockdown in melanoma cells was linked to G1 cell cycle arrest and reduced p42 MAPK expression, placing ELP6 upstream of ERK1/2 signaling in this context.","evidence":"shRNA knockdown with flow cytometry cell cycle analysis and western blot for ERK pathway components","pmids":["40177137"],"confidence":"Medium","gaps":["Whether ERK pathway effects are direct or secondary to tRNA modification defects untested","Single lab, no rescue experiment reported","Mechanism connecting tRNA modification to MAPK pathway not defined"]},{"year":null,"claim":"Key unresolved questions include: the atomic-resolution structure of holo-human Elongator with tRNA substrate bound, the mechanism of tRNA handoff from the Elp456 ring to the Elp3 catalytic site, whether ELP6 possesses ATPase activity or only binds ATP, and the precise neuronal cell types whose dysfunction underlies ELP6-associated disease.","evidence":"","pmids":[],"confidence":"High","gaps":["No structure of holo-Elongator with tRNA substrate","ATPase activity of ELP6 not biochemically confirmed","Cell-type-specific disease mechanism in neurons undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[6,7]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[3,7,13]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[4,6]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[8,12]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[4,5,10]}],"complexes":["Elongator complex","Elp4/5/6 subcomplex"],"partners":["ELP4","ELP5","ELP3","ELP1","ELP2"],"other_free_text":[]},"mechanistic_narrative":"ELP6 is a core subunit of the evolutionarily conserved Elongator complex, where it serves as a structural bridge within the Elp4/5/6 heterohexameric ring that adopts a RecA-like ATPase fold and mediates ATP-regulated tRNA binding required for mcm5/ncm5 wobble uridine modifications [PMID:22343726, PMID:22556426, PMID:15769872]. The intact Elp456 ring is essential for holo-Elongator histone acetyltransferase activity toward histones H3 and H4, and loss of ELP6 disrupts association of the Elp456 subcomplex with the catalytic Elp123 subcomplex [PMID:11904415, PMID:12424236]. The tRNA modification function of Elongator accounts for its roles in translational fidelity, polarized exocytosis, and cell migration, as tRNA overexpression suppresses phenotypes of Elongator-deficient cells [PMID:17018299, PMID:22854966]. Patient-derived missense mutations in human ELP6 impair tRNA modification and cause a neurodevelopmental disorder with epilepsy and motor dysfunction, as demonstrated by structural analysis of mutant Elp456 and recapitulation in mouse models [PMID:35698786]."},"prefetch_data":{"uniprot":{"accession":"Q0PNE2","full_name":"Elongator complex protein 6","aliases":["Angiotonin-transactivated protein 1","Protein TMEM103"],"length_aa":266,"mass_kda":29.8,"function":"Component of the elongator complex which is required for multiple tRNA modifications, including mcm5U (5-methoxycarbonylmethyl uridine), mcm5s2U (5-methoxycarbonylmethyl-2-thiouridine), and ncm5U (5-carbamoylmethyl uridine) (PubMed:29332244). The elongator complex catalyzes formation of carboxymethyluridine in the wobble base at position 34 in tRNAs (PubMed:22854966, PubMed:29332244). Involved in cell migration (By similarity)","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q0PNE2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/ELP6","classification":"Common Essential","n_dependent_lines":1119,"n_total_lines":1208,"dependency_fraction":0.9263245033112583},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ELP6","total_profiled":1310},"omim":[{"mim_id":"616054","title":"ELONGATOR ACETYLTRANSFERASE COMPLEX, SUBUNIT 2; ELP2","url":"https://www.omim.org/entry/616054"},{"mim_id":"615020","title":"ELONGATOR ACETYLTRANSFERASE COMPLEX, SUBUNIT 6; ELP6","url":"https://www.omim.org/entry/615020"},{"mim_id":"615019","title":"ELONGATOR ACETYLTRANSFERASE COMPLEX, SUBUNIT 5; ELP5","url":"https://www.omim.org/entry/615019"},{"mim_id":"612722","title":"ELONGATOR ACETYLTRANSFERASE COMPLEX, SUBUNIT 3; ELP3","url":"https://www.omim.org/entry/612722"},{"mim_id":"603722","title":"ELONGATOR COMPLEX PROTEIN 1; ELP1","url":"https://www.omim.org/entry/603722"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"},{"location":"Centrosome","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ELP6"},"hgnc":{"alias_symbol":["FLJ20211"],"prev_symbol":["TMEM103","C3orf75"]},"alphafold":{"accession":"Q0PNE2","domains":[{"cath_id":"3.40.50.300","chopping":"4-259","consensus_level":"high","plddt":91.0076,"start":4,"end":259}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q0PNE2","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q0PNE2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q0PNE2-F1-predicted_aligned_error_v6.png","plddt_mean":90.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ELP6","jax_strain_url":"https://www.jax.org/strain/search?query=ELP6"},"sequence":{"accession":"Q0PNE2","fasta_url":"https://rest.uniprot.org/uniprotkb/Q0PNE2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q0PNE2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q0PNE2"}},"corpus_meta":[{"pmid":"15769872","id":"PMC_15769872","title":"An early step in 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BcElp4 in vegetative development, various environmental stress response and virulence of Botrytis cinerea.","date":"2017","source":"Microbial biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/28474462","citation_count":9,"is_preprint":false},{"pmid":"30360492","id":"PMC_30360492","title":"Unfolded Protein Response Suppression in Yeast by Loss of tRNA Modifications.","date":"2018","source":"Genes","url":"https://pubmed.ncbi.nlm.nih.gov/30360492","citation_count":9,"is_preprint":false},{"pmid":"36393857","id":"PMC_36393857","title":"Elongator promotes neuritogenesis via regulation of tau stability through acly activity.","date":"2022","source":"Frontiers in cell and developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/36393857","citation_count":5,"is_preprint":false},{"pmid":"24748431","id":"PMC_24748431","title":"Identification and expression of the elongator protein 2 (Ajelp2) gene, a novel regeneration-related gene from the sea cucumber Apostichopus japonicus.","date":"2014","source":"Molecular biology reports","url":"https://pubmed.ncbi.nlm.nih.gov/24748431","citation_count":4,"is_preprint":false},{"pmid":"35128251","id":"PMC_35128251","title":"Biochemical and Structural Characterization of Human Core Elongator and Its Subassemblies.","date":"2022","source":"ACS omega","url":"https://pubmed.ncbi.nlm.nih.gov/35128251","citation_count":3,"is_preprint":false},{"pmid":"41326361","id":"PMC_41326361","title":"Comparative transcriptomic analysis of retinal response to diverse cellular stresses reveals relative contributions of different cell death processes and signalling networks.","date":"2025","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/41326361","citation_count":2,"is_preprint":false},{"pmid":"38673955","id":"PMC_38673955","title":"Evolutionary Conservation in Protein-Protein Interactions and Structures of the Elongator Sub-Complex ELP456 from Arabidopsis and Yeast.","date":"2024","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/38673955","citation_count":1,"is_preprint":false},{"pmid":"40177137","id":"PMC_40177137","title":"Role of ELP6 in tumour progression and impact on ERK1/2 signalling pathway inhibitors in skin cutaneous melanoma.","date":"2025","source":"Oncology letters","url":"https://pubmed.ncbi.nlm.nih.gov/40177137","citation_count":0,"is_preprint":false},{"pmid":"24284306","id":"PMC_24284306","title":"Developing and mature human granulocytes express ELP 6 in the cytoplasm.","date":"2013","source":"Human antibodies","url":"https://pubmed.ncbi.nlm.nih.gov/24284306","citation_count":0,"is_preprint":false},{"pmid":"41347503","id":"PMC_41347503","title":"Leishmania donovani elongator protein Elp3a plays a crucial role in modulating the parasite response to genotoxic stress.","date":"2025","source":"Microbiology spectrum","url":"https://pubmed.ncbi.nlm.nih.gov/41347503","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":20674,"output_tokens":3277,"usd":0.055588},"stage2":{"model":"claude-opus-4-6","input_tokens":6685,"output_tokens":5126,"usd":0.242363},"total_usd":0.297951,"stage1_batch_id":"msgbatch_0118RScg3WGaGkaZRtWZbtce","stage2_batch_id":"msgbatch_01Cpfzvtbj42aqp5oYZ5Te2s","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2001,\n      \"finding\": \"ELP6 (TOT6) is one of three subunits forming the Elp4/5/6 subcomplex (HAP) of the six-subunit holo-Elongator complex; the full complex can be separated into two subcomplexes: Elp1/2/3 and Elp4/5/6, each purified by TAP of any individual subunit.\",\n      \"method\": \"Tandem affinity purification (TAP), biochemical fractionation, genetic disruption with phenotypic analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal TAP purification replicated in two independent labs (Krogan/Greenblatt and Winkler/Svejstrup)\",\n      \"pmids\": [\"11689709\", \"11435442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Disruption of ELP6 (TOT6) confers resistance to K. lactis zymocin, thermosensitivity, slow growth, and hypersensitivity to drugs, phenotypes identical to other elp mutants, establishing ELP6 as functionally integral to the Elongator/TOT complex.\",\n      \"method\": \"Gene deletion, phenotypic analysis (zymocin resistance, growth assays)\",\n      \"journal\": \"Molecular microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — consistent phenotypic results across multiple labs\",\n      \"pmids\": [\"11737649\", \"11689709\", \"11435442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The three smallest Elongator subunits Elp4, Elp5, and Elp6 are required for the histone acetyltransferase (HAT) activity of the intact Elongator complex toward histone H3 (K14) and H4 (K8), including nucleosomal substrates.\",\n      \"method\": \"In vitro HAT assay with purified complex from elp4, elp5, elp6 deletion strains; chromatin immunoprecipitation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro enzymatic assay with defined subunit deletions plus in vivo ChIP validation\",\n      \"pmids\": [\"11904415\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Structural integrity of the Elp4/5/6 (HAP) subcomplex requires ELP6; deletion of elp6 abolishes the interaction between Elp5 and Elp2, and disrupts association of the HAP subcomplex with core Elongator (Elp1/2/3).\",\n      \"method\": \"Co-immunoprecipitation, subunit interaction mapping in deletion strains\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP with multiple subunit pairs tested in elp6 deletion background\",\n      \"pmids\": [\"12424236\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"ELP6, along with ELP1–ELP5 and KTI11–KTI13, is required for an early step in the synthesis of the mcm5 and ncm5 modifications on wobble uridines in tRNA; tRNA immunoprecipitation showed direct association of Elongator subunits with tRNA substrates.\",\n      \"method\": \"Analysis of modified nucleosides in individual tRNA species by HPLC; tRNA immunoprecipitation (RIP)\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — direct tRNA modification measurement plus RIP, replicated across multiple Elongator subunit mutants\",\n      \"pmids\": [\"15769872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The tRNA modification (mcm5 group formation) function of Elongator, requiring ELP6 among other subunits, accounts for its roles in transcriptional elongation and polarized exocytosis phenotypes, as elevated expression of two tRNA species suppresses all these phenotypes in Elongator-deficient cells.\",\n      \"method\": \"Genetic suppression by tRNA overexpression; phenotypic rescue assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistasis via genetic suppression with multiple phenotypes tested, clear mechanistic conclusion\",\n      \"pmids\": [\"17018299\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The yeast Elp4/5/6 subcomplex forms a heterohexameric ring-like structure in which each subunit adopts a RecA-like ATPase fold; the hexameric Elp456 ring binds tRNAs in an ATP-regulated manner, directly supporting the role of Elongator in tRNA modification.\",\n      \"method\": \"X-ray crystallography; in vitro tRNA-binding assays; ATP-regulation assays; site-directed mutagenesis\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure plus in vitro functional assays with mutagenesis\",\n      \"pmids\": [\"22343726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Crystal structure of the yeast Elp4-6 subcomplex shows that Elp6 acts as a structural bridge assembling Elp4 and Elp5; each subunit has a RecA-ATPase-like fold; the hexameric ring assembly is required for specific histone H3 binding as shown by GST pulldown and mutagenesis.\",\n      \"method\": \"X-ray crystallography; site-directed mutagenesis; GST pulldown; biochemical assembly assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure plus mutagenesis and pulldown assays\",\n      \"pmids\": [\"22556426\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Human ELP6 (C3ORF75) is identified as a bona fide subunit of human Elongator; ELP5 (DERP6) is required for complex integrity and directly connects ELP3 to ELP4; depletion of ELP6 impairs migration, invasion, and tumorigenicity of melanoma cells.\",\n      \"method\": \"Biochemical co-purification; RNAi knockdown; cell migration/invasion assays; tumorigenicity assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — biochemical identification plus multiple functional cellular assays in human cells\",\n      \"pmids\": [\"22854966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Full yeast Elongator adopts a bilobal, asymmetric architecture (~850 kDa) with the hexameric Elp456 subassembly anchored to one of the two Elp123 lobes; single-particle EM combined with cross-linking mass spectrometry placed ELP6 within this overall architecture.\",\n      \"method\": \"Single-particle electron microscopy; cross-linking coupled to mass spectrometry; molecular modeling\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — EM structure integrated with XL-MS restraints\",\n      \"pmids\": [\"27872205\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Patient-derived missense mutations in human ELP6 impair tRNA modification activity of the Elongator complex in vitro and in human and murine cells; structural determination of human and murine Elp456 locates mutated residues; modeling pathogenic ELP6 variants in mice recapitulates neurological defects (developmental delay, epilepsy, motor dysfunction) distinct from those caused by Elp123 mutations.\",\n      \"method\": \"Cryo-EM/crystal structure of human/murine Elp456; in vitro tRNA modification assay; HPLC-MS tRNA modification analysis in patient cells; mouse modeling\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structure plus in vitro and in vivo tRNA modification assays plus mouse modeling; multiple orthogonal methods\",\n      \"pmids\": [\"35698786\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In human Elongator assembly, hELP4/5/6 is recruited to hELP1/2/3 via hELP3; hELP1 stabilizes hELP3; hELP2 enhances integrity and substrate-binding ability of the dimeric hELP1/2/3; ELP6 is part of the peripheral subcomplex.\",\n      \"method\": \"Co-purification of recombinant human subunits; pulldown assays; single-particle electron microscopy\",\n      \"journal\": \"ACS omega\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-purification and EM, single lab\",\n      \"pmids\": [\"35128251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Human ELP6 protein (~30 kDa) is expressed intracellularly in developing and mature granulocytes (neutrophils, eosinophils) and monocytes in human bone marrow, but not in lymphocytes or erythrocytes.\",\n      \"method\": \"Western blot; flow cytometry with monoclonal antibody; RT-PCR\",\n      \"journal\": \"Human antibodies\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct protein localization by flow cytometry and western blot, single lab\",\n      \"pmids\": [\"24284306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Arabidopsis ELP4 interacts directly with ELP6 but not directly with ELP5 in vivo, and ELP6 acts as a structural bridge in the AtELP456 heterotrimer, a configuration structurally conserved with yeast Elp456 despite low sequence homology.\",\n      \"method\": \"In vivo protein-protein interaction assays (yeast two-hybrid / co-IP in planta); structural prediction and comparative analysis\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — in vivo interaction data plus structural comparison, single lab\",\n      \"pmids\": [\"38673955\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ELP6 knockdown in melanoma cells causes G1 phase cell cycle arrest, reduced cell viability, decreased p42 MAPK expression, and reduced responsiveness to the MEK1/2 inhibitor U0126, placing ELP6 function upstream of the ERK1/2 signalling pathway.\",\n      \"method\": \"shRNA knockdown; flow cytometry cell cycle analysis; western blot for ERK pathway components; pharmacological inhibitor assays\",\n      \"journal\": \"Oncology letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — KD with cellular phenotype and pathway readout, single lab\",\n      \"pmids\": [\"40177137\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ELP6 is the sixth subunit of the evolutionarily conserved, ~850 kDa Elongator complex, where it forms part of the Elp4/5/6 hexameric RecA-like ATPase subcomplex that bridges to the catalytic Elp1/2/3 subcomplex; within this subcomplex ELP6 acts as a structural bridge connecting ELP4 and ELP5, and the intact Elp456 ring is required for ATP-regulated tRNA binding, the mcm5/ncm5 wobble uridine modification activity that underlies Elongator's roles in translation efficiency, neuronal development, and cell migration, as well as for the HAT activity of holo-Elongator toward histones H3 and H4.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ELP6 is a core subunit of the evolutionarily conserved Elongator complex, where it serves as a structural bridge within the Elp4/5/6 heterohexameric ring that adopts a RecA-like ATPase fold and mediates ATP-regulated tRNA binding required for mcm5/ncm5 wobble uridine modifications [PMID:22343726, PMID:22556426, PMID:15769872]. The intact Elp456 ring is essential for holo-Elongator histone acetyltransferase activity toward histones H3 and H4, and loss of ELP6 disrupts association of the Elp456 subcomplex with the catalytic Elp123 subcomplex [PMID:11904415, PMID:12424236]. The tRNA modification function of Elongator accounts for its roles in translational fidelity, polarized exocytosis, and cell migration, as tRNA overexpression suppresses phenotypes of Elongator-deficient cells [PMID:17018299, PMID:22854966]. Patient-derived missense mutations in human ELP6 impair tRNA modification and cause a neurodevelopmental disorder with epilepsy and motor dysfunction, as demonstrated by structural analysis of mutant Elp456 and recapitulation in mouse models [PMID:35698786].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Establishing that ELP6 is part of a distinct three-subunit subcomplex (Elp4/5/6) within a six-subunit Elongator resolved the modular architecture of the complex and placed ELP6 as a separable functional unit.\",\n      \"evidence\": \"Tandem affinity purification and biochemical fractionation in yeast, replicated across two independent labs\",\n      \"pmids\": [\"11689709\", \"11435442\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural information on ELP6 or the Elp456 subcomplex\", \"Enzymatic activity of each subcomplex undefined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstrating that ELP6 deletion phenocopied all other Elongator subunit deletions (zymocin resistance, thermosensitivity, slow growth) established it as functionally integral rather than peripheral.\",\n      \"evidence\": \"Gene deletion and phenotypic analysis in yeast across multiple labs\",\n      \"pmids\": [\"11737649\", \"11689709\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular function of ELP6 within the complex unknown\", \"Whether phenotypes reflect tRNA modification, HAT activity, or other functions unresolved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Showing that Elp4/5/6 subunits are required for the HAT activity of holo-Elongator identified the subcomplex as an essential regulatory or structural cofactor for catalysis, and revealed that ELP6 deletion disrupts the Elp456–Elp123 interaction.\",\n      \"evidence\": \"In vitro HAT assays on free and nucleosomal histones with subunit deletion strains; co-immunoprecipitation mapping\",\n      \"pmids\": [\"11904415\", \"12424236\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Elp456 directly contacts substrate or allosterically activates Elp3 unknown\", \"Structural basis for ELP6's bridging role undefined\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identifying ELP6 as required for mcm5/ncm5 wobble uridine tRNA modification established a direct molecular function for Elongator beyond chromatin, with tRNA immunoprecipitation showing Elongator–tRNA association.\",\n      \"evidence\": \"HPLC analysis of modified nucleosides in individual tRNAs from elp mutants; tRNA immunoprecipitation\",\n      \"pmids\": [\"15769872\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ELP6 directly contacts tRNA unknown\", \"Relative contributions of tRNA modification vs. HAT activity to cellular phenotypes unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Genetic suppression of Elongator-deficient phenotypes by tRNA overexpression demonstrated that tRNA modification is the primary cellular function underlying transcriptional elongation and exocytosis phenotypes, unifying disparate roles.\",\n      \"evidence\": \"tRNA overexpression rescue of multiple elp mutant phenotypes in yeast\",\n      \"pmids\": [\"17018299\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HAT activity has any tRNA-independent role remains unresolved\", \"Mechanism by which specific tRNA modifications affect exocytosis not defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Crystal structures of yeast Elp456 revealed a heterohexameric ring with RecA-like ATPase folds, showed ELP6 acts as the structural bridge connecting ELP4 and ELP5, and demonstrated ATP-regulated tRNA binding by the ring, providing the first mechanistic framework for substrate engagement.\",\n      \"evidence\": \"X-ray crystallography; in vitro tRNA-binding and ATP-regulation assays; site-directed mutagenesis; GST pulldown for histone H3 binding\",\n      \"pmids\": [\"22343726\", \"22556426\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ATP is hydrolyzed or only bound is unclear\", \"How tRNA is handed off from Elp456 to the catalytic Elp3 active site unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identification of human ELP6 (C3ORF75) as a bona fide human Elongator subunit extended findings to mammalian biology and showed ELP6 depletion impairs melanoma cell migration and tumorigenicity.\",\n      \"evidence\": \"Biochemical co-purification of human subunits; RNAi knockdown with migration, invasion, and tumorigenicity assays in melanoma cells\",\n      \"pmids\": [\"22854966\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether migration defects are tRNA-modification-dependent or reflect an independent function not tested\", \"Signaling pathways downstream of ELP6 in cancer cells uncharacterized\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Single-particle EM of full yeast Elongator placed the Elp456 hexamer on one of the two Elp123 lobes within a bilobal ~850 kDa asymmetric architecture, establishing the spatial relationship between the regulatory and catalytic subcomplexes.\",\n      \"evidence\": \"Single-particle electron microscopy with cross-linking mass spectrometry restraints\",\n      \"pmids\": [\"27872205\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Resolution insufficient for atomic-level subunit interfaces\", \"How asymmetry relates to catalytic mechanism unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Patient-derived ELP6 missense mutations were shown to impair tRNA modification both in vitro and in patient cells, and mouse modeling recapitulated a neurodevelopmental syndrome with epilepsy and motor defects, establishing ELP6 as a disease gene with a mechanism distinct from Elp123 mutations.\",\n      \"evidence\": \"Cryo-EM/crystal structure of human/murine Elp456; in vitro tRNA modification assay; HPLC-MS in patient cells; mouse modeling\",\n      \"pmids\": [\"35698786\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether all pathogenic ELP6 variants act through the same mechanism unknown\", \"Neuronal cell-type-specific consequences of tRNA hypomodification not resolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"ELP6 knockdown in melanoma cells was linked to G1 cell cycle arrest and reduced p42 MAPK expression, placing ELP6 upstream of ERK1/2 signaling in this context.\",\n      \"evidence\": \"shRNA knockdown with flow cytometry cell cycle analysis and western blot for ERK pathway components\",\n      \"pmids\": [\"40177137\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether ERK pathway effects are direct or secondary to tRNA modification defects untested\", \"Single lab, no rescue experiment reported\", \"Mechanism connecting tRNA modification to MAPK pathway not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the atomic-resolution structure of holo-human Elongator with tRNA substrate bound, the mechanism of tRNA handoff from the Elp456 ring to the Elp3 catalytic site, whether ELP6 possesses ATPase activity or only binds ATP, and the precise neuronal cell types whose dysfunction underlies ELP6-associated disease.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of holo-Elongator with tRNA substrate\", \"ATPase activity of ELP6 not biochemically confirmed\", \"Cell-type-specific disease mechanism in neurons undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [6, 7]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [3, 7, 13]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [4, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [8, 12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0008953854\", \"supporting_discovery_ids\": [4, 5, 10]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [4, 5, 10]}\n    ],\n    \"complexes\": [\"Elongator complex\", \"Elp4/5/6 subcomplex\"],\n    \"partners\": [\"ELP4\", \"ELP5\", \"ELP3\", \"ELP1\", \"ELP2\"],\n    \"other_free_text\": []\n  }\n}\n```\n\nWait, I made an error in the pathway term_ids. Let me fix:\n\n```json\n{\n  \"mechanistic_narrative\": \"ELP6 is a core subunit of the evolutionarily conserved Elongator complex, where it serves as a structural bridge within the Elp4/5/6 heterohexameric ring that adopts a RecA-like ATPase fold and mediates ATP-regulated tRNA binding required for mcm5/ncm5 wobble uridine modifications [PMID:22343726, PMID:22556426, PMID:15769872]. The intact Elp456 ring is essential for holo-Elongator histone acetyltransferase activity toward histones H3 and H4, and loss of ELP6 disrupts association of the Elp456 subcomplex with the catalytic Elp123 subcomplex [PMID:11904415, PMID:12424236]. The tRNA modification function of Elongator accounts for its roles in translational fidelity, polarized exocytosis, and cell migration, as tRNA overexpression suppresses phenotypes of Elongator-deficient cells [PMID:17018299, PMID:22854966]. Patient-derived missense mutations in human ELP6 impair tRNA modification and cause a neurodevelopmental disorder with epilepsy and motor dysfunction, as demonstrated by structural analysis of mutant Elp456 and recapitulation in mouse models [PMID:35698786].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Establishing that ELP6 is part of a distinct three-subunit subcomplex (Elp4/5/6) within a six-subunit Elongator resolved the modular architecture of the complex and placed ELP6 as a separable functional unit.\",\n      \"evidence\": \"Tandem affinity purification and biochemical fractionation in yeast, replicated across two independent labs\",\n      \"pmids\": [\"11689709\", \"11435442\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural information on ELP6 or the Elp456 subcomplex\", \"Enzymatic activity of each subcomplex undefined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstrating that ELP6 deletion phenocopied all other Elongator subunit deletions (zymocin resistance, thermosensitivity, slow growth) established it as functionally integral rather than peripheral.\",\n      \"evidence\": \"Gene deletion and phenotypic analysis in yeast across multiple labs\",\n      \"pmids\": [\"11737649\", \"11689709\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular function of ELP6 within the complex unknown\", \"Whether phenotypes reflect tRNA modification, HAT activity, or other functions unresolved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Showing that Elp4/5/6 subunits are required for the HAT activity of holo-Elongator identified the subcomplex as an essential regulatory or structural cofactor for catalysis, and revealed that ELP6 deletion disrupts the Elp456-Elp123 interaction.\",\n      \"evidence\": \"In vitro HAT assays on free and nucleosomal histones with subunit deletion strains; co-immunoprecipitation mapping\",\n      \"pmids\": [\"11904415\", \"12424236\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Elp456 directly contacts substrate or allosterically activates Elp3 unknown\", \"Structural basis for ELP6's bridging role undefined\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identifying ELP6 as required for mcm5/ncm5 wobble uridine tRNA modification established a direct molecular function for Elongator beyond chromatin, with tRNA immunoprecipitation showing Elongator-tRNA association.\",\n      \"evidence\": \"HPLC analysis of modified nucleosides in individual tRNAs from elp mutants; tRNA immunoprecipitation\",\n      \"pmids\": [\"15769872\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ELP6 directly contacts tRNA unknown\", \"Relative contributions of tRNA modification vs. HAT activity to cellular phenotypes unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Genetic suppression of Elongator-deficient phenotypes by tRNA overexpression demonstrated that tRNA modification is the primary cellular function underlying transcriptional elongation and exocytosis phenotypes, unifying disparate roles.\",\n      \"evidence\": \"tRNA overexpression rescue of multiple elp mutant phenotypes in yeast\",\n      \"pmids\": [\"17018299\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HAT activity has any tRNA-independent role remains unresolved\", \"Mechanism by which specific tRNA modifications affect exocytosis not defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Crystal structures of yeast Elp456 revealed a heterohexameric ring with RecA-like ATPase folds, showed ELP6 acts as the structural bridge connecting ELP4 and ELP5, and demonstrated ATP-regulated tRNA binding by the ring, providing the first mechanistic framework for substrate engagement.\",\n      \"evidence\": \"X-ray crystallography; in vitro tRNA-binding and ATP-regulation assays; site-directed mutagenesis; GST pulldown for histone H3 binding\",\n      \"pmids\": [\"22343726\", \"22556426\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ATP is hydrolyzed or only bound is unclear\", \"How tRNA is handed off from Elp456 to the catalytic Elp3 active site unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identification of human ELP6 (C3ORF75) as a bona fide human Elongator subunit extended findings to mammalian biology and showed ELP6 depletion impairs melanoma cell migration and tumorigenicity.\",\n      \"evidence\": \"Biochemical co-purification of human subunits; RNAi knockdown with migration, invasion, and tumorigenicity assays in melanoma cells\",\n      \"pmids\": [\"22854966\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether migration defects are tRNA-modification-dependent or reflect an independent function not tested\", \"Signaling pathways downstream of ELP6 in cancer cells uncharacterized\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Single-particle EM of full yeast Elongator placed the Elp456 hexamer on one of the two Elp123 lobes within a bilobal ~850 kDa asymmetric architecture, establishing the spatial relationship between the regulatory and catalytic subcomplexes.\",\n      \"evidence\": \"Single-particle electron microscopy with cross-linking mass spectrometry restraints\",\n      \"pmids\": [\"27872205\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Resolution insufficient for atomic-level subunit interfaces\", \"How asymmetry relates to catalytic mechanism unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Patient-derived ELP6 missense mutations were shown to impair tRNA modification both in vitro and in patient cells, and mouse modeling recapitulated a neurodevelopmental syndrome with epilepsy and motor defects, establishing ELP6 as a disease gene with a mechanism distinct from Elp123 mutations.\",\n      \"evidence\": \"Cryo-EM/crystal structure of human/murine Elp456; in vitro tRNA modification assay; HPLC-MS in patient cells; mouse modeling\",\n      \"pmids\": [\"35698786\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether all pathogenic ELP6 variants act through the same mechanism unknown\", \"Neuronal cell-type-specific consequences of tRNA hypomodification not resolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"ELP6 knockdown in melanoma cells was linked to G1 cell cycle arrest and reduced p42 MAPK expression, placing ELP6 upstream of ERK1/2 signaling in this context.\",\n      \"evidence\": \"shRNA knockdown with flow cytometry cell cycle analysis and western blot for ERK pathway components\",\n      \"pmids\": [\"40177137\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether ERK pathway effects are direct or secondary to tRNA modification defects untested\", \"Single lab, no rescue experiment reported\", \"Mechanism connecting tRNA modification to MAPK pathway not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the atomic-resolution structure of holo-human Elongator with tRNA substrate bound, the mechanism of tRNA handoff from the Elp456 ring to the Elp3 catalytic site, whether ELP6 possesses ATPase activity or only binds ATP, and the precise neuronal cell types whose dysfunction underlies ELP6-associated disease.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of holo-Elongator with tRNA substrate\", \"ATPase activity of ELP6 not biochemically confirmed\", \"Cell-type-specific disease mechanism in neurons undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [6, 7]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [3, 7, 13]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [4, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [8, 12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [4, 5, 10]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [4, 5, 10]}\n    ],\n    \"complexes\": [\"Elongator complex\", \"Elp4/5/6 subcomplex\"],\n    \"partners\": [\"ELP4\", \"ELP5\", \"ELP3\", \"ELP1\", \"ELP2\"],\n    \"other_free_text\": []\n  }\n}\n```"}