{"gene":"ELP5","run_date":"2026-04-28T17:46:03","timeline":{"discoveries":[{"year":2002,"finding":"Elp4, Elp5, and Elp6 are required for the HAT activity of the intact Elongator complex, which acetylates histone H3 (primarily K14) and histone H4 (primarily K8), including nucleosomal substrates; the complex binds both naked and nucleosomal DNA.","method":"In vitro HAT assay with purified Elongator complex; yeast deletion mutants; chromatin immunoprecipitation","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro enzymatic assay with defined substrates combined with in vivo ChIP confirmation, replicated across subunit deletions","pmids":["11904415"],"is_preprint":false},{"year":2001,"finding":"Elp4, Elp5, and Elp6 form a discrete subcomplex (HAP subcomplex) within the six-subunit holo-Elongator complex associated with elongating RNA Pol II; disruption of ELP5 is essential for yeast growth, while loss of ELP4 or ELP6 phenocopies loss of the core Elp1-3 subunits.","method":"Tandem affinity purification (TAP); gene disruption; microarray expression analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal TAP purification identifying all six subunits, replicated by two independent labs in the same year","pmids":["11689709","11435442"],"is_preprint":false},{"year":2001,"finding":"Holo-Elongator dissociates into two subcomplexes at higher salt concentrations: Elp1/2/3 (core) and Elp4/5/6 (HAP), demonstrating modular organization of the complex.","method":"Affinity chromatography purification; salt fractionation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — biochemical reconstitution/fractionation, replicated across two independent labs","pmids":["11435442","11689709"],"is_preprint":false},{"year":2002,"finding":"The structural integrity of the Elp4/5/6 (HAP/TOT5-7) subcomplex requires ELP4/TOT7 and ELP6/TOT6; loss of these genes abolishes the interaction between Elp5 and the core Elongator subunit Elp2/Tot2p.","method":"Co-immunoprecipitation; yeast deletion genetics","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 — co-IP epistasis dissecting subunit interactions within the complex, single lab","pmids":["12424236"],"is_preprint":false},{"year":2002,"finding":"Kti12/Tot4p physically interacts with the holo-Elongator complex and requires both the Elp1-3 core and Elp5 for this interaction, suggesting it contacts preassembled holo-Elongator to modulate its activity.","method":"Co-immunoprecipitation; yeast genetics","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 — single co-IP, single lab, but consistent with other genetic evidence","pmids":["12424236","11929532"],"is_preprint":false},{"year":2008,"finding":"Kti11/Dph3 physically interacts with Elp2 and Elp5, two Elongator subunits; deletion of KTI11 phenocopies Elongator-minus cells, and a C-terminal truncation mutation (kti11-1) that almost entirely abolishes Elongator interaction separates zymocin resistance from other Kti11 functions.","method":"Co-immunoprecipitation; yeast genetics; separation-of-function mutation","journal":"Molecular microbiology","confidence":"Medium","confidence_rationale":"Tier 2-3 — co-IP with separation-of-function mutagenesis, single lab","pmids":["18627462"],"is_preprint":false},{"year":2012,"finding":"The Elp4/5/6 subcomplex adopts a heterohexameric ring structure where each subunit has an almost identical RecA-like fold; the complex binds tRNA in an ATP-regulated manner, supporting a role in tRNA modification.","method":"X-ray crystallography; in vitro tRNA binding assay; ATP-modulation experiments; in vivo complementation","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 — crystal structure combined with functional tRNA-binding assay and in vivo validation, single rigorous paper with multiple orthogonal methods","pmids":["22343726"],"is_preprint":false},{"year":2012,"finding":"Crystal structure of yeast Elp4-6 reveals that Elp6 acts as a structural bridge assembling Elp4 and Elp5; each subunit has a RecA-ATPase-like fold. The hexameric ring assembly of Elp4-6 is required for specific histone H3 binding, as shown by mutagenesis and GST pulldown.","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; corroborated by independent structural study same year","pmids":["22556426"],"is_preprint":false},{"year":2012,"finding":"Human DERP6/ELP5 is an integral subunit of the human Elongator complex that directly connects ELP3 to ELP4 and is required for the structural integrity of the complex; depletion of ELP5 impairs Elongator integrity and reduces migration, invasion, and tumorigenicity of melanoma cells.","method":"Biochemical co-purification; siRNA knockdown; cell migration/invasion assays; co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP confirming subunit connectivity, loss-of-function with defined cellular phenotypes, human protein characterized","pmids":["22854966"],"is_preprint":false},{"year":2019,"finding":"Loss of ELP5 impairs the integrity and stability of the Elongator complex, abrogates wobble U34 tRNA modification, and thereby impedes U34 modification-dependent translation of hnRNPQ mRNA; reduced hnRNPQ cannot drive P53 IRES-dependent translation, reducing gemcitabine-induced apoptosis in a P53-dependent manner.","method":"CRISPR screen; tRNA modification assay; polysome profiling/translation assay; rescue experiments with U34-modification-independent hnRNPQ mutant; in vitro and in vivo functional assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods including genome-wide CRISPR screen, tRNA modification assays, and mechanistic rescue experiments in a single rigorous study","pmids":["31792210"],"is_preprint":false},{"year":2021,"finding":"ELP5 transcription in gallbladder cancer is epigenetically repressed by DNMT3A-catalysed promoter hypermethylation, which blocks the transcription factor PAX5 from binding the ELP5 promoter; demethylation with DAC restores PAX5 binding and ELP5 expression.","method":"RT-qPCR; MS-qPCR; ChIP-qPCR; EMSA; luciferase reporter assay; chromatin accessibility assay","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal epigenetic methods (ChIP, EMSA, luciferase) from single lab","pmids":["34823564"],"is_preprint":false},{"year":2006,"finding":"Human DERP6/ELP5 protein localizes to the cytoplasm when overexpressed, and overexpression activates p53 transcriptional activity.","method":"Fluorescence microscopy (subcellular localization); luciferase reporter assay","journal":"Molecular biology reports","confidence":"Low","confidence_rationale":"Tier 3 — reporter assay and overexpression localization only, single lab, no mechanistic pathway placement","pmids":["16850183"],"is_preprint":false}],"current_model":"ELP5 (DERP6) is an integral subunit of the conserved six-subunit Elongator complex, where it resides in the Elp4/5/6 heterohexameric RecA-like ATPase subcomplex that structurally requires Elp6 as a bridge; ELP5 is required for the structural integrity and HAT activity of holo-Elongator (histone H3-K14 and H4-K8 acetylation), for ATP-regulated tRNA binding by the Elp456 ring, and for wobble U34 tRNA modification—a function that is mechanistically linked to translation of specific mRNAs (e.g., hnRNPQ) and, consequently, to P53-dependent apoptosis and chemotherapy sensitivity."},"narrative":{"teleology":[{"year":2001,"claim":"Identification of ELP5 as part of a modular Elp4/5/6 subcomplex within holo-Elongator established the architecture of the six-subunit complex and showed that holo-Elongator dissociates into core (Elp1-3) and accessory (Elp4-6) modules.","evidence":"Tandem affinity purification and salt fractionation in yeast, replicated by two independent laboratories","pmids":["11689709","11435442"],"confidence":"High","gaps":["No atomic-resolution structure of the Elp4/5/6 subcomplex","Enzymatic contribution of the Elp4/5/6 module versus the Elp1-3 catalytic core not delineated","Whether this architecture is conserved in metazoan Elongator was unknown"]},{"year":2002,"claim":"Demonstration that all three Elp4/5/6 subunits are required for Elongator's histone acetyltransferase activity, and that Elp6 acts as a structural bridge needed for Elp5 to associate with the core, defined the functional dependency of the complex on its accessory ring.","evidence":"In vitro HAT assays on nucleosomal substrates with yeast deletion mutants; co-immunoprecipitation epistasis among subunits","pmids":["11904415","12424236"],"confidence":"High","gaps":["Which subunit directly contacts the histone substrate was unknown","No structural basis for Elp6 bridging role","Role in tRNA modification not yet recognized"]},{"year":2002,"claim":"Discovery that the regulatory protein Kti12 physically contacts holo-Elongator and requires both the Elp1-3 core and Elp5 for binding linked Elongator to zymocin toxicity and implied a regulatory input at the Elp5 surface.","evidence":"Co-immunoprecipitation and yeast genetics","pmids":["12424236","11929532"],"confidence":"Medium","gaps":["Direct binding interface between Kti12 and Elp5 not mapped","Mechanism by which Kti12 modulates Elongator activity unknown"]},{"year":2008,"claim":"Identification of Kti11/Dph3 as a physical interactor of both Elp2 and Elp5 expanded the network of regulatory cofactors converging on ELP5, with a separation-of-function mutation distinguishing Elongator-dependent from Elongator-independent Kti11 roles.","evidence":"Co-immunoprecipitation and separation-of-function mutagenesis in yeast","pmids":["18627462"],"confidence":"Medium","gaps":["Whether Kti11 binds Elp5 directly or via Elp2 not resolved","Functional consequence of Kti11–Elp5 interaction on tRNA modification not tested"]},{"year":2012,"claim":"Crystal structures of yeast Elp4/5/6 revealed a heterohexameric ring with RecA-like ATPase folds, showed Elp6 bridges Elp4 and Elp5, and demonstrated that this ring binds tRNA in an ATP-regulated manner and histone H3 via the assembled hexameric surface, unifying the complex's HAT and tRNA modification activities at the structural level.","evidence":"X-ray crystallography; in vitro tRNA and histone binding assays with site-directed mutants; in vivo complementation (two independent structural studies)","pmids":["22343726","22556426"],"confidence":"High","gaps":["How ATP hydrolysis modulates tRNA binding or release mechanistically unclear","No structure of intact holo-Elongator at this time","Whether histone binding and tRNA binding are mutually exclusive or concurrent"]},{"year":2012,"claim":"Characterization of human ELP5 confirmed it directly connects ELP3 to ELP4 and is required for Elongator integrity, extending the yeast findings to mammalian cells and linking ELP5 loss to reduced melanoma cell migration and tumorigenicity.","evidence":"Reciprocal co-immunoprecipitation; siRNA knockdown in human melanoma cell lines with functional assays","pmids":["22854966"],"confidence":"High","gaps":["Molecular basis of how ELP5 loss reduces invasion not established beyond Elongator disruption","Whether ELP5 affects tRNA modification in human cells not yet tested"]},{"year":2019,"claim":"A genome-wide CRISPR screen established that ELP5 loss abrogates wobble U34 tRNA modification and thereby specifically impairs translation of hnRNPQ mRNA, connecting Elongator's tRNA modification function to p53 IRES-dependent apoptosis and gemcitabine sensitivity.","evidence":"CRISPR screen; tRNA modification mass spectrometry; polysome profiling; rescue with U34-modification-independent hnRNPQ construct; in vivo xenograft","pmids":["31792210"],"confidence":"High","gaps":["Full set of mRNAs translationally regulated by ELP5-dependent U34 modification not catalogued","Whether ELP5 has functions beyond Elongator's tRNA modification role not addressed","Contribution of ELP5's HAT activity versus tRNA modification to cancer phenotypes not separated"]},{"year":2021,"claim":"ELP5 expression in gallbladder cancer is regulated by DNMT3A-mediated promoter hypermethylation that prevents PAX5 binding, providing an epigenetic mechanism for ELP5 silencing in tumors.","evidence":"Methylation-specific qPCR, ChIP-qPCR, EMSA, and luciferase reporter in gallbladder cancer cell lines","pmids":["34823564"],"confidence":"Medium","gaps":["Whether this epigenetic silencing occurs in other tumor types not tested","Whether restored ELP5 expression rescues U34 tRNA modification in gallbladder cancer not shown","Single-lab findings await independent validation"]},{"year":null,"claim":"How the Elp4/5/6 ring coordinates ATP-dependent tRNA binding with the catalytic cycle of Elp3 within the full holo-Elongator structure, and whether ELP5 has Elongator-independent functions, remain open questions.","evidence":"","pmids":[],"confidence":"High","gaps":["No cryo-EM or crystal structure of metazoan holo-Elongator with tRNA substrate in a catalytic intermediate","Separation of ELP5's HAT-supporting role from its tRNA modification role not achieved in human cells","Complete translational target repertoire downstream of ELP5-dependent U34 modification undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[6,7]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[6]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[0,7]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[11,8]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[6,9]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,9]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[9]}],"complexes":["Elongator complex","Elp4/5/6 subcomplex"],"partners":["ELP3","ELP4","ELP6","ELP2","ELP1","KTI12","DPH3"],"other_free_text":[]},"mechanistic_narrative":"ELP5 is an essential subunit of the six-subunit Elongator complex, functioning within the Elp4/5/6 heterohexameric ring that adopts a RecA-like ATPase fold and binds tRNA in an ATP-regulated manner [PMID:22343726, PMID:22556426]. ELP5 directly bridges the catalytic ELP3 subunit to ELP4, and its loss dismantles the holo-Elongator complex, abolishing both histone acetyltransferase activity (targeting H3-K14 and H4-K8) and wobble uridine-34 tRNA modification [PMID:11904415, PMID:22854966, PMID:31792210]. The tRNA modification function of ELP5-containing Elongator is mechanistically linked to codon-dependent translation of specific mRNAs, including hnRNPQ, whose U34-modification-dependent translation drives p53 IRES-mediated expression and thereby controls gemcitabine-induced apoptosis [PMID:31792210]. In gallbladder cancer, ELP5 transcription is epigenetically silenced by DNMT3A-mediated promoter hypermethylation that occludes the transcription factor PAX5 [PMID:34823564]."},"prefetch_data":{"uniprot":{"accession":"Q8TE02","full_name":"Elongator complex protein 5","aliases":["Dermal papilla-derived protein 6","S-phase 2 protein"],"length_aa":300,"mass_kda":33.2,"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:29332244). Involved in cell migration (By similarity)","subcellular_location":"Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q8TE02/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/ELP5","classification":"Common Essential","n_dependent_lines":1141,"n_total_lines":1208,"dependency_fraction":0.9445364238410596},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ELP5","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":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"testis","ntpm":160.8}],"url":"https://www.proteinatlas.org/search/ELP5"},"hgnc":{"alias_symbol":["DERP6"],"prev_symbol":["C17orf81"]},"alphafold":{"accession":"Q8TE02","domains":[{"cath_id":"3.40.50.300","chopping":"12-229","consensus_level":"high","plddt":82.0652,"start":12,"end":229}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8TE02","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8TE02-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8TE02-F1-predicted_aligned_error_v6.png","plddt_mean":78.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ELP5","jax_strain_url":"https://www.jax.org/strain/search?query=ELP5"},"sequence":{"accession":"Q8TE02","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8TE02.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8TE02/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8TE02"}},"corpus_meta":[{"pmid":"11904415","id":"PMC_11904415","title":"Elongator is a histone H3 and H4 acetyltransferase important for normal histone acetylation levels in vivo.","date":"2002","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/11904415","citation_count":221,"is_preprint":false},{"pmid":"11689709","id":"PMC_11689709","title":"Characterization of a six-subunit holo-elongator complex required for the regulated expression of a group of genes in Saccharomyces cerevisiae.","date":"2001","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/11689709","citation_count":152,"is_preprint":false},{"pmid":"11435442","id":"PMC_11435442","title":"RNA polymerase II elongator holoenzyme is composed of two discrete subcomplexes.","date":"2001","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11435442","citation_count":147,"is_preprint":false},{"pmid":"31792210","id":"PMC_31792210","title":"Genome-wide CRISPR screen identifies ELP5 as a determinant of gemcitabine sensitivity in gallbladder cancer.","date":"2019","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/31792210","citation_count":81,"is_preprint":false},{"pmid":"22343726","id":"PMC_22343726","title":"The Elongator subcomplex Elp456 is a hexameric RecA-like ATPase.","date":"2012","source":"Nature structural & molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/22343726","citation_count":77,"is_preprint":false},{"pmid":"11929532","id":"PMC_11929532","title":"Molecular analysis of KTI12/TOT4, a Saccharomyces cerevisiae gene required for Kluyveromyces lactis zymocin action.","date":"2002","source":"Molecular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/11929532","citation_count":55,"is_preprint":false},{"pmid":"18627462","id":"PMC_18627462","title":"A versatile partner of eukaryotic protein complexes that is involved in multiple biological processes: Kti11/Dph3.","date":"2008","source":"Molecular 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chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12424236","citation_count":37,"is_preprint":false},{"pmid":"22556426","id":"PMC_22556426","title":"Crystal structure of elongator subcomplex Elp4-6.","date":"2012","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/22556426","citation_count":34,"is_preprint":false},{"pmid":"29332244","id":"PMC_29332244","title":"Structural insights into the function of Elongator.","date":"2018","source":"Cellular and molecular life sciences : CMLS","url":"https://pubmed.ncbi.nlm.nih.gov/29332244","citation_count":28,"is_preprint":false},{"pmid":"34823564","id":"PMC_34823564","title":"Epigenetic activation of the elongator complex sensitizes gallbladder cancer to gemcitabine therapy.","date":"2021","source":"Journal of experimental & clinical cancer research : CR","url":"https://pubmed.ncbi.nlm.nih.gov/34823564","citation_count":15,"is_preprint":false},{"pmid":"19779648","id":"PMC_19779648","title":"Human Elongator complex is involved in cell cycle and suppresses cell growth in 293T human embryonic kidney cells.","date":"2009","source":"Acta biochimica et biophysica Sinica","url":"https://pubmed.ncbi.nlm.nih.gov/19779648","citation_count":13,"is_preprint":false},{"pmid":"38563283","id":"PMC_38563283","title":"Shared genetic basis and causality between schizophrenia and inflammatory bowel disease: evidence from a comprehensive genetic analysis.","date":"2024","source":"Psychological medicine","url":"https://pubmed.ncbi.nlm.nih.gov/38563283","citation_count":13,"is_preprint":false},{"pmid":"32325232","id":"PMC_32325232","title":"Non-chromatographic purification of thermostable endoglucanase from Thermotoga maritima by fusion with a hydrophobic elastin-like polypeptide.","date":"2020","source":"Protein expression and purification","url":"https://pubmed.ncbi.nlm.nih.gov/32325232","citation_count":12,"is_preprint":false},{"pmid":"16850183","id":"PMC_16850183","title":"Cloning and characterization of the human gene DERP6, which activates transcriptional activities of p53.","date":"2006","source":"Molecular biology reports","url":"https://pubmed.ncbi.nlm.nih.gov/16850183","citation_count":7,"is_preprint":false},{"pmid":"25759378","id":"PMC_25759378","title":"A common variant in the CLDN7/ELP5 locus predicts adiponectin change with lifestyle intervention and improved fitness in obese individuals with diabetes.","date":"2015","source":"Physiological genomics","url":"https://pubmed.ncbi.nlm.nih.gov/25759378","citation_count":7,"is_preprint":false},{"pmid":"34440402","id":"PMC_34440402","title":"Hearing Function: Identification of New Candidate Genes Further Explaining the Complexity of This Sensory Ability.","date":"2021","source":"Genes","url":"https://pubmed.ncbi.nlm.nih.gov/34440402","citation_count":5,"is_preprint":false},{"pmid":"38324544","id":"PMC_38324544","title":"A comprehensive meta-analysis of transcriptome data to identify signature genes associated with pancreatic ductal 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\"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro enzymatic assay with defined substrates combined with in vivo ChIP confirmation, replicated across subunit deletions\",\n      \"pmids\": [\"11904415\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Elp4, Elp5, and Elp6 form a discrete subcomplex (HAP subcomplex) within the six-subunit holo-Elongator complex associated with elongating RNA Pol II; disruption of ELP5 is essential for yeast growth, while loss of ELP4 or ELP6 phenocopies loss of the core Elp1-3 subunits.\",\n      \"method\": \"Tandem affinity purification (TAP); gene disruption; microarray expression analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal TAP purification identifying all six subunits, replicated by two independent labs in the same year\",\n      \"pmids\": [\"11689709\", \"11435442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Holo-Elongator dissociates into two subcomplexes at higher salt concentrations: Elp1/2/3 (core) and Elp4/5/6 (HAP), demonstrating modular organization of the complex.\",\n      \"method\": \"Affinity chromatography purification; salt fractionation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — biochemical reconstitution/fractionation, replicated across two independent labs\",\n      \"pmids\": [\"11435442\", \"11689709\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The structural integrity of the Elp4/5/6 (HAP/TOT5-7) subcomplex requires ELP4/TOT7 and ELP6/TOT6; loss of these genes abolishes the interaction between Elp5 and the core Elongator subunit Elp2/Tot2p.\",\n      \"method\": \"Co-immunoprecipitation; yeast deletion genetics\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — co-IP epistasis dissecting subunit interactions within the complex, single lab\",\n      \"pmids\": [\"12424236\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Kti12/Tot4p physically interacts with the holo-Elongator complex and requires both the Elp1-3 core and Elp5 for this interaction, suggesting it contacts preassembled holo-Elongator to modulate its activity.\",\n      \"method\": \"Co-immunoprecipitation; yeast genetics\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single co-IP, single lab, but consistent with other genetic evidence\",\n      \"pmids\": [\"12424236\", \"11929532\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Kti11/Dph3 physically interacts with Elp2 and Elp5, two Elongator subunits; deletion of KTI11 phenocopies Elongator-minus cells, and a C-terminal truncation mutation (kti11-1) that almost entirely abolishes Elongator interaction separates zymocin resistance from other Kti11 functions.\",\n      \"method\": \"Co-immunoprecipitation; yeast genetics; separation-of-function mutation\",\n      \"journal\": \"Molecular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — co-IP with separation-of-function mutagenesis, single lab\",\n      \"pmids\": [\"18627462\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The Elp4/5/6 subcomplex adopts a heterohexameric ring structure where each subunit has an almost identical RecA-like fold; the complex binds tRNA in an ATP-regulated manner, supporting a role in tRNA modification.\",\n      \"method\": \"X-ray crystallography; in vitro tRNA binding assay; ATP-modulation experiments; in vivo complementation\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure combined with functional tRNA-binding assay and in vivo validation, single rigorous paper with multiple orthogonal methods\",\n      \"pmids\": [\"22343726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Crystal structure of yeast Elp4-6 reveals that Elp6 acts as a structural bridge assembling Elp4 and Elp5; each subunit has a RecA-ATPase-like fold. The hexameric ring assembly of Elp4-6 is required for specific histone H3 binding, as shown by mutagenesis and GST pulldown.\",\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; corroborated by independent structural study same year\",\n      \"pmids\": [\"22556426\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Human DERP6/ELP5 is an integral subunit of the human Elongator complex that directly connects ELP3 to ELP4 and is required for the structural integrity of the complex; depletion of ELP5 impairs Elongator integrity and reduces migration, invasion, and tumorigenicity of melanoma cells.\",\n      \"method\": \"Biochemical co-purification; siRNA knockdown; cell migration/invasion assays; co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP confirming subunit connectivity, loss-of-function with defined cellular phenotypes, human protein characterized\",\n      \"pmids\": [\"22854966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Loss of ELP5 impairs the integrity and stability of the Elongator complex, abrogates wobble U34 tRNA modification, and thereby impedes U34 modification-dependent translation of hnRNPQ mRNA; reduced hnRNPQ cannot drive P53 IRES-dependent translation, reducing gemcitabine-induced apoptosis in a P53-dependent manner.\",\n      \"method\": \"CRISPR screen; tRNA modification assay; polysome profiling/translation assay; rescue experiments with U34-modification-independent hnRNPQ mutant; in vitro and in vivo functional assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including genome-wide CRISPR screen, tRNA modification assays, and mechanistic rescue experiments in a single rigorous study\",\n      \"pmids\": [\"31792210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ELP5 transcription in gallbladder cancer is epigenetically repressed by DNMT3A-catalysed promoter hypermethylation, which blocks the transcription factor PAX5 from binding the ELP5 promoter; demethylation with DAC restores PAX5 binding and ELP5 expression.\",\n      \"method\": \"RT-qPCR; MS-qPCR; ChIP-qPCR; EMSA; luciferase reporter assay; chromatin accessibility assay\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal epigenetic methods (ChIP, EMSA, luciferase) from single lab\",\n      \"pmids\": [\"34823564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Human DERP6/ELP5 protein localizes to the cytoplasm when overexpressed, and overexpression activates p53 transcriptional activity.\",\n      \"method\": \"Fluorescence microscopy (subcellular localization); luciferase reporter assay\",\n      \"journal\": \"Molecular biology reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — reporter assay and overexpression localization only, single lab, no mechanistic pathway placement\",\n      \"pmids\": [\"16850183\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ELP5 (DERP6) is an integral subunit of the conserved six-subunit Elongator complex, where it resides in the Elp4/5/6 heterohexameric RecA-like ATPase subcomplex that structurally requires Elp6 as a bridge; ELP5 is required for the structural integrity and HAT activity of holo-Elongator (histone H3-K14 and H4-K8 acetylation), for ATP-regulated tRNA binding by the Elp456 ring, and for wobble U34 tRNA modification—a function that is mechanistically linked to translation of specific mRNAs (e.g., hnRNPQ) and, consequently, to P53-dependent apoptosis and chemotherapy sensitivity.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ELP5 is an essential subunit of the six-subunit Elongator complex, functioning within the Elp4/5/6 heterohexameric ring that adopts a RecA-like ATPase fold and binds tRNA in an ATP-regulated manner [PMID:22343726, PMID:22556426]. ELP5 directly bridges the catalytic ELP3 subunit to ELP4, and its loss dismantles the holo-Elongator complex, abolishing both histone acetyltransferase activity (targeting H3-K14 and H4-K8) and wobble uridine-34 tRNA modification [PMID:11904415, PMID:22854966, PMID:31792210]. The tRNA modification function of ELP5-containing Elongator is mechanistically linked to codon-dependent translation of specific mRNAs, including hnRNPQ, whose U34-modification-dependent translation drives p53 IRES-mediated expression and thereby controls gemcitabine-induced apoptosis [PMID:31792210]. In gallbladder cancer, ELP5 transcription is epigenetically silenced by DNMT3A-mediated promoter hypermethylation that occludes the transcription factor PAX5 [PMID:34823564].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Identification of ELP5 as part of a modular Elp4/5/6 subcomplex within holo-Elongator established the architecture of the six-subunit complex and showed that holo-Elongator dissociates into core (Elp1-3) and accessory (Elp4-6) modules.\",\n      \"evidence\": \"Tandem affinity purification and salt fractionation in yeast, replicated by two independent laboratories\",\n      \"pmids\": [\"11689709\", \"11435442\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No atomic-resolution structure of the Elp4/5/6 subcomplex\",\n        \"Enzymatic contribution of the Elp4/5/6 module versus the Elp1-3 catalytic core not delineated\",\n        \"Whether this architecture is conserved in metazoan Elongator was unknown\"\n      ]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstration that all three Elp4/5/6 subunits are required for Elongator's histone acetyltransferase activity, and that Elp6 acts as a structural bridge needed for Elp5 to associate with the core, defined the functional dependency of the complex on its accessory ring.\",\n      \"evidence\": \"In vitro HAT assays on nucleosomal substrates with yeast deletion mutants; co-immunoprecipitation epistasis among subunits\",\n      \"pmids\": [\"11904415\", \"12424236\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Which subunit directly contacts the histone substrate was unknown\",\n        \"No structural basis for Elp6 bridging role\",\n        \"Role in tRNA modification not yet recognized\"\n      ]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Discovery that the regulatory protein Kti12 physically contacts holo-Elongator and requires both the Elp1-3 core and Elp5 for binding linked Elongator to zymocin toxicity and implied a regulatory input at the Elp5 surface.\",\n      \"evidence\": \"Co-immunoprecipitation and yeast genetics\",\n      \"pmids\": [\"12424236\", \"11929532\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct binding interface between Kti12 and Elp5 not mapped\",\n        \"Mechanism by which Kti12 modulates Elongator activity unknown\"\n      ]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identification of Kti11/Dph3 as a physical interactor of both Elp2 and Elp5 expanded the network of regulatory cofactors converging on ELP5, with a separation-of-function mutation distinguishing Elongator-dependent from Elongator-independent Kti11 roles.\",\n      \"evidence\": \"Co-immunoprecipitation and separation-of-function mutagenesis in yeast\",\n      \"pmids\": [\"18627462\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether Kti11 binds Elp5 directly or via Elp2 not resolved\",\n        \"Functional consequence of Kti11–Elp5 interaction on tRNA modification not tested\"\n      ]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Crystal structures of yeast Elp4/5/6 revealed a heterohexameric ring with RecA-like ATPase folds, showed Elp6 bridges Elp4 and Elp5, and demonstrated that this ring binds tRNA in an ATP-regulated manner and histone H3 via the assembled hexameric surface, unifying the complex's HAT and tRNA modification activities at the structural level.\",\n      \"evidence\": \"X-ray crystallography; in vitro tRNA and histone binding assays with site-directed mutants; in vivo complementation (two independent structural studies)\",\n      \"pmids\": [\"22343726\", \"22556426\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How ATP hydrolysis modulates tRNA binding or release mechanistically unclear\",\n        \"No structure of intact holo-Elongator at this time\",\n        \"Whether histone binding and tRNA binding are mutually exclusive or concurrent\"\n      ]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Characterization of human ELP5 confirmed it directly connects ELP3 to ELP4 and is required for Elongator integrity, extending the yeast findings to mammalian cells and linking ELP5 loss to reduced melanoma cell migration and tumorigenicity.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation; siRNA knockdown in human melanoma cell lines with functional assays\",\n      \"pmids\": [\"22854966\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Molecular basis of how ELP5 loss reduces invasion not established beyond Elongator disruption\",\n        \"Whether ELP5 affects tRNA modification in human cells not yet tested\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"A genome-wide CRISPR screen established that ELP5 loss abrogates wobble U34 tRNA modification and thereby specifically impairs translation of hnRNPQ mRNA, connecting Elongator's tRNA modification function to p53 IRES-dependent apoptosis and gemcitabine sensitivity.\",\n      \"evidence\": \"CRISPR screen; tRNA modification mass spectrometry; polysome profiling; rescue with U34-modification-independent hnRNPQ construct; in vivo xenograft\",\n      \"pmids\": [\"31792210\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Full set of mRNAs translationally regulated by ELP5-dependent U34 modification not catalogued\",\n        \"Whether ELP5 has functions beyond Elongator's tRNA modification role not addressed\",\n        \"Contribution of ELP5's HAT activity versus tRNA modification to cancer phenotypes not separated\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"ELP5 expression in gallbladder cancer is regulated by DNMT3A-mediated promoter hypermethylation that prevents PAX5 binding, providing an epigenetic mechanism for ELP5 silencing in tumors.\",\n      \"evidence\": \"Methylation-specific qPCR, ChIP-qPCR, EMSA, and luciferase reporter in gallbladder cancer cell lines\",\n      \"pmids\": [\"34823564\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether this epigenetic silencing occurs in other tumor types not tested\",\n        \"Whether restored ELP5 expression rescues U34 tRNA modification in gallbladder cancer not shown\",\n        \"Single-lab findings await independent validation\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the Elp4/5/6 ring coordinates ATP-dependent tRNA binding with the catalytic cycle of Elp3 within the full holo-Elongator structure, and whether ELP5 has Elongator-independent functions, remain open questions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No cryo-EM or crystal structure of metazoan holo-Elongator with tRNA substrate in a catalytic intermediate\",\n        \"Separation of ELP5's HAT-supporting role from its tRNA modification role not achieved in human cells\",\n        \"Complete translational target repertoire downstream of ELP5-dependent U34 modification undefined\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [6, 7]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [0, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [11, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [6, 9]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 9]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"complexes\": [\n      \"Elongator complex\",\n      \"Elp4/5/6 subcomplex\"\n    ],\n    \"partners\": [\n      \"ELP3\",\n      \"ELP4\",\n      \"ELP6\",\n      \"ELP2\",\n      \"ELP1\",\n      \"KTI12\",\n      \"DPH3\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}