{"gene":"DTX3","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2003,"finding":"DTX3, like other DTX family members (DTX1, DTX2), functions as an E3 ubiquitin-protein isopeptide ligase, demonstrated by its capacity for self-ubiquitination in vitro. DTX family members homodimerize and heterodimerize in vivo, and physical interactions between DTX family members modify E3 activity and/or substrate availability.","method":"In vitro self-ubiquitination assay, yeast two-hybrid screen, co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro E3 ligase activity demonstrated by self-ubiquitination assay; dimerization confirmed by Co-IP; multiple orthogonal methods in single study","pmids":["12670957"],"is_preprint":false},{"year":2020,"finding":"DTX3 ubiquitinates NOTCH2, promoting its degradation. DTX3 overexpression suppressed proliferation and tumorigenicity of esophageal carcinoma cells, and DTX3 was identified as a novel E3 ligase for NOTCH2 by yeast two-hybrid screening.","method":"Yeast two-hybrid screening, ubiquitination assay, overexpression/knockdown with cell proliferation and migration readouts","journal":"Cancer science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — substrate identified by Y2H and ubiquitination assay; functional phenotype confirmed by gain/loss-of-function; single lab, two orthogonal methods","pmids":["31854042"],"is_preprint":false},{"year":2020,"finding":"DCAF13 binds the AU-rich element (ARE) in the DTX3 mRNA 3'UTR and accelerates its degradation, acting as an RNA-binding protein. Reduced DTX3 levels consequently activate NOTCH4 signaling in triple-negative breast cancer.","method":"RNA-binding protein assay (RBP-ARE interaction), mRNA stability assay, overexpression/knockdown with signaling readouts","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RBP-ARE binding and mRNA decay demonstrated; functional pathway consequence (NOTCH4 activation) shown; single lab","pmids":["33300431"],"is_preprint":false},{"year":2020,"finding":"DTX3 promotes ubiquitination and proteasomal degradation of NOTCH4 in triple-negative breast cancer cells.","method":"Ubiquitination assay, overexpression/knockdown with western blot for NOTCH4 protein levels","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitination and degradation of NOTCH4 shown; functional consequence demonstrated; single lab","pmids":["33300431"],"is_preprint":false},{"year":2020,"finding":"DTX3 interacts with mutant p53 in ovarian carcinoma cells, mediates its ubiquitination and stabilization by perturbing the MDM2-mutant p53 interaction, and consequently activates mutant p53 target genes. DTX3 depletion suppressed ovarian cancer cell proliferation and invasion in a mutant p53-dependent manner.","method":"Co-immunoprecipitation, ubiquitination assay, overexpression/knockdown with cell proliferation, invasion, and in vivo tumor growth assays","journal":"Genes & diseases","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and ubiquitination assay; functional phenotype confirmed in vitro and in vivo; single lab, multiple methods","pmids":["35782979"],"is_preprint":false},{"year":2021,"finding":"DTX3 co-localizes with XRCC5 (Ku80) in the nucleus, promotes its ubiquitination, and inhibits AKT signaling, thereby suppressing epithelial-mesenchymal transition in papillary thyroid carcinoma cells.","method":"IP-mass spectrometry, co-immunoprecipitation, immunofluorescence co-localization, ubiquitination assay, overexpression/knockdown with EMT and AKT signaling readouts","journal":"Journal of Cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — substrate (XRCC5) identified by IP-MS and confirmed by Co-IP; ubiquitination shown; nuclear co-localization by immunofluorescence; single lab, multiple orthogonal methods","pmids":["33403043"],"is_preprint":false},{"year":2022,"finding":"DTX3 overexpression reduced E2F1 transcriptional activity and downstream target gene expression (CDC2, Cyclin D3), inhibiting CRC cell proliferation and colony formation, while DTX3 knockout had the opposite effect.","method":"Overexpression/knockout with cell proliferation, colony formation assays; transcriptional reporter/western blot for E2F1 target genes","journal":"Molecular biology reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — functional phenotype with pathway readout; no direct biochemical interaction between DTX3 and E2F1 demonstrated; single lab, single approach","pmids":["35098394"],"is_preprint":false},{"year":2024,"finding":"DTX3 (like DTX3L, but not DTX1, DTX2, or DTX4) directly ubiquitylates DNA and RNA in vitro via ester bond formation, with preference for 3'-terminal adenosine. This nucleic acid ubiquitylation is reversible by deubiquitylases USP2, JOSD1, and SARS-CoV-2 PLpro.","method":"In vitro ubiquitylation assay with purified components, biochemical characterization of ester-bond linkage, DUB reversal assay","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct in vitro reconstitution with purified proteins; multiple DUBs tested for reversal; substrate preference characterized; novel activity rigorously demonstrated in single study with multiple orthogonal biochemical methods","pmids":["39242775"],"is_preprint":false},{"year":2023,"finding":"A novel N-terminal isoform of DTX3 (DTX3c) associates with UBA1 (E1), UBE2N (E2), and Cdc48/p97 ATPase as part of a complex that ubiquitinates EphB4 kinase at its C-tail upon IGF-II signal deprivation, promoting EphB4 degradation. Cdc48/p97 ATPase activity was required for EphB4 recruitment to this complex.","method":"Targeted proteomics, co-immunoprecipitation, PCR cloning (isoform identification), 3D modeling","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — complex components identified by targeted proteomics and confirmed by Co-IP; functional ATPase requirement shown; novel isoform cloned; single lab, multiple methods","pmids":["37108544"],"is_preprint":false},{"year":2025,"finding":"DTX3 catalyzes monoubiquitylation of tankyrase in cells, occurring on mono-ADP-ribose (MAR) rather than a canonical lysine, creating a monoubiquitin-MAR hybrid mark. This mark prevents PAR formation on tankyrase, antagonizing RNF146-mediated degradation and thereby stabilizing tankyrase. The hybrid mark is subsequently recognized and extended by RING-UIM E3 ligases RNF114 and RNF166.","method":"Cell-based ubiquitylation assays, biochemical characterization of ubiquitin-MAR linkage, genetic epistasis with RNF146/RNF114/RNF166","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — non-canonical ubiquitylation site (MAR) demonstrated biochemically in cells; epistatic relationship with RNF146 and stabilization outcome shown; preprint, single lab, not yet peer-reviewed","pmids":["bio_10.1101_2025.04.09.648013"],"is_preprint":true},{"year":2025,"finding":"DTX3 binds to the Notch intracellular domain (NICD) via its C-terminal RING finger domain, promotes NICD ubiquitination and degradation, and thereby suppresses Notch pathway activation, inhibiting bladder cancer cell migration and invasion. The Notch inhibitor DAPT partially reversed the effects of DTX3 knockdown on metastatic ability.","method":"Co-immunoprecipitation, ubiquitination assay, overexpression/knockdown with migration/invasion assays in vitro and in vivo; domain mapping","journal":"International immunopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — NICD binding confirmed by Co-IP; ubiquitination/degradation demonstrated; RING domain mapped as binding domain; epistasis with DAPT inhibitor; single lab","pmids":["40127622"],"is_preprint":false}],"current_model":"DTX3 is a RING finger-containing E3 ubiquitin ligase that ubiquitinates multiple substrates including NOTCH2, NOTCH4, NICD, XRCC5, mutant p53, and EphB4 (via its novel DTX3c isoform), typically promoting their degradation and suppressing oncogenic signaling pathways (Notch, AKT, mutant p53); it also catalyzes non-canonical ubiquitylation of nucleic acids and of mono-ADP-ribose on tankyrase via ester bonds, and can homodimerize and heterodimerize with other DTX family members to modulate E3 activity; its own mRNA is subject to post-transcriptional regulation by the RNA-binding protein DCAF13."},"narrative":{"mechanistic_narrative":"DTX3 is a RING finger E3 ubiquitin ligase that ubiquitinates a range of protein substrates and thereby restrains oncogenic signaling [PMID:12670957, PMID:31854042]. Its canonical activity targets Notch-family proteins for degradation: DTX3 ubiquitinates NOTCH2 [PMID:31854042] and NOTCH4 [PMID:33300431], and binds the Notch intracellular domain (NICD) through its C-terminal RING domain to drive its ubiquitination and proteasomal turnover, suppressing Notch pathway activation [PMID:40127622]. Beyond Notch, DTX3 ubiquitinates XRCC5 (Ku80) in the nucleus to inhibit AKT signaling [PMID:33403043], and stabilizes mutant p53 by perturbing the MDM2–mutant p53 interaction, illustrating that its ubiquitination output is not uniformly degradative [PMID:35782979]. Across these contexts DTX3 generally acts as a tumor suppressor, with overexpression reducing proliferation, migration, and invasion [PMID:31854042, PMID:40127622]. DTX3 also catalyzes non-canonical ubiquitylation: it directly modifies DNA and RNA in vitro via ester-bond formation with preference for 3'-terminal adenosine [PMID:39242775]. A novel N-terminal isoform, DTX3c, assembles with UBA1, UBE2N and the Cdc48/p97 ATPase to ubiquitinate EphB4 upon IGF-II deprivation [PMID:37108544]. DTX3 family members homo- and heterodimerize, modulating E3 activity and substrate availability [PMID:12670957], and DTX3 mRNA is itself destabilized by the RNA-binding protein DCAF13, which acts on a 3'UTR AU-rich element [PMID:33300431].","teleology":[{"year":2003,"claim":"Established DTX3 as a catalytically active E3 ligase and revealed that DTX family members physically associate to modulate one another's activity, framing DTX3 within a regulatable ligase network.","evidence":"In vitro self-ubiquitination assay, yeast two-hybrid, and Co-IP demonstrating dimerization","pmids":["12670957"],"confidence":"High","gaps":["No physiological substrate identified at this stage","Functional consequence of dimerization on specific targets not defined"]},{"year":2020,"claim":"Identified Notch receptors as DTX3 substrates, defining a degradative axis that links DTX3 to suppression of Notch-driven tumor phenotypes.","evidence":"Y2H, ubiquitination assays, and gain/loss-of-function in esophageal carcinoma (NOTCH2) and triple-negative breast cancer (NOTCH4)","pmids":["31854042","33300431"],"confidence":"Medium","gaps":["Ubiquitin chain topology not defined","Direct vs indirect ubiquitination of receptor not fully resolved"]},{"year":2020,"claim":"Showed DTX3 itself is post-transcriptionally controlled, placing it downstream of an RNA-decay pathway that derepresses Notch signaling when DTX3 is lost.","evidence":"RBP-ARE binding and mRNA stability assays for DCAF13 in triple-negative breast cancer","pmids":["33300431"],"confidence":"Medium","gaps":["Upstream regulators of DCAF13 not addressed","Generality of this control across tissues unknown"]},{"year":2020,"claim":"Demonstrated that DTX3 ubiquitination can stabilize rather than degrade a substrate, by acting on mutant p53 and perturbing MDM2 engagement.","evidence":"Reciprocal Co-IP, ubiquitination assay, and in vitro/in vivo functional assays in ovarian carcinoma","pmids":["35782979"],"confidence":"Medium","gaps":["Ubiquitin linkage type producing stabilization not characterized","Whether wild-type p53 is similarly affected unclear"]},{"year":2021,"claim":"Extended DTX3 substrates to nuclear XRCC5 (Ku80) and connected its ligase activity to AKT-driven EMT suppression.","evidence":"IP-MS, Co-IP, immunofluorescence co-localization, and ubiquitination assay in papillary thyroid carcinoma","pmids":["33403043"],"confidence":"Medium","gaps":["Mechanistic link between XRCC5 ubiquitination and AKT signaling not detailed","Fate of ubiquitinated XRCC5 not established"]},{"year":2022,"claim":"Linked DTX3 to E2F1 transcriptional output and cell-cycle gene expression in colorectal cancer, though without a direct biochemical connection.","evidence":"Overexpression/knockout with proliferation, colony formation, and E2F1 target readouts","pmids":["35098394"],"confidence":"Low","gaps":["No direct DTX3–E2F1 interaction demonstrated","Whether the effect is ligase-dependent unknown"]},{"year":2023,"claim":"Defined a DTX3c isoform-specific ubiquitination machine coupling DTX3 to the p97 ATPase and growth-factor signaling for EphB4 turnover.","evidence":"Targeted proteomics, Co-IP, isoform cloning, and 3D modeling identifying UBA1/UBE2N/Cdc48-p97 complex","pmids":["37108544"],"confidence":"Medium","gaps":["Physiological scope of DTX3c beyond EphB4 unknown","Direct ubiquitin transfer reconstitution not shown"]},{"year":2024,"claim":"Revealed a non-protein activity, establishing that DTX3 ubiquitylates nucleic acids via reversible ester bonds with sequence preference.","evidence":"In vitro reconstitution with purified components, ester-bond characterization, and DUB reversal assays","pmids":["39242775"],"confidence":"High","gaps":["Cellular substrates and biological role of nucleic acid ubiquitylation unknown","Targeting/specificity determinants in cells undefined"]},{"year":2025,"claim":"Showed DTX3 writes a non-canonical ubiquitin-on-MAR hybrid mark on tankyrase that protects it from RNF146-mediated degradation, expanding DTX3 chemistry to ADP-ribose acceptors.","evidence":"Cell-based ubiquitylation assays, ubiquitin-MAR linkage characterization, and genetic epistasis with RNF146/RNF114/RNF166 (preprint)","pmids":["bio_10.1101_2025.04.09.648013"],"confidence":"Medium","gaps":["Not yet peer-reviewed","Broader substrate range of the MAR-ubiquitin mark unknown"]},{"year":2025,"claim":"Confirmed direct NICD binding through the DTX3 RING domain, mapping the structural basis for Notch suppression and metastasis control.","evidence":"Co-IP, domain mapping, ubiquitination assay, and migration/invasion assays with DAPT epistasis in bladder cancer","pmids":["40127622"],"confidence":"Medium","gaps":["Ubiquitin chain type on NICD not defined","Relative contribution of NICD vs full-length receptor ubiquitination unclear"]},{"year":null,"claim":"How DTX3 selects between degradative and stabilizing outcomes, and what governs its choice among protein, nucleic acid, and ADP-ribose acceptors in vivo, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model for substrate/linkage selectivity","In vivo relevance of nucleic acid and MAR ubiquitylation not established","Structural basis of multi-acceptor catalysis unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,1,3,4,5,7,8,9,10]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[1,3,4,5,8,10]},{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[0,7,9]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[7]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[7]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[5]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1,3,4,5,8,10]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,5,8,10]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[1,4,5,6,10]}],"complexes":[],"partners":["NOTCH2","NOTCH4","XRCC5","TP53","EPHB4","UBA1","UBE2N","DCAF13"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8N9I9","full_name":"E3 ubiquitin-protein ligase DTX3","aliases":["Protein deltex-3","Deltex3","RING finger protein 154","RING-type E3 ubiquitin transferase DTX3"],"length_aa":347,"mass_kda":38.0,"function":"Functions as an ubiquitin ligase protein, and regulates Notch signaling (PubMed:35782979, PubMed:40127622). By promoting the ubiquitination and subsequent degradation of target proteins, it can block activation of the Notch signaling pathway, potentially acting as a tumor suppressor in human cancers (PubMed:31854042, PubMed:35782979, PubMed:40127622) Involved in the angiogenic EPHB4 kinase degradation in cancer cell","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q8N9I9/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DTX3","classification":"Not Classified","n_dependent_lines":10,"n_total_lines":1208,"dependency_fraction":0.008278145695364239},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DTX3","total_profiled":1310},"omim":[{"mim_id":"613143","title":"DELTEX E3 UBIQUITIN LIGASE 3L; DTX3L","url":"https://www.omim.org/entry/613143"},{"mim_id":"613142","title":"DELTEX E3 UBIQUITIN LIGASE 3; DTX3","url":"https://www.omim.org/entry/613142"},{"mim_id":"613141","title":"DELTEX E3 UBIQUITIN LIGASE 2; DTX2","url":"https://www.omim.org/entry/613141"},{"mim_id":"605501","title":"M-PHASE PHOSPHOPROTEIN 9; MPHOSPH9","url":"https://www.omim.org/entry/605501"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Nucleoli","reliability":"Approved"},{"location":"Golgi apparatus","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/DTX3"},"hgnc":{"alias_symbol":["FLJ34766","RNF154"],"prev_symbol":[]},"alphafold":{"accession":"Q8N9I9","domains":[{"cath_id":"3.30.1370.10","chopping":"17-97","consensus_level":"high","plddt":86.5156,"start":17,"end":97},{"cath_id":"3.30.40.10","chopping":"162-207","consensus_level":"medium","plddt":89.902,"start":162,"end":207},{"cath_id":"3.30.390.130","chopping":"217-341","consensus_level":"high","plddt":95.2777,"start":217,"end":341}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N9I9","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N9I9-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N9I9-F1-predicted_aligned_error_v6.png","plddt_mean":82.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DTX3","jax_strain_url":"https://www.jax.org/strain/search?query=DTX3"},"sequence":{"accession":"Q8N9I9","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8N9I9.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8N9I9/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N9I9"}},"corpus_meta":[{"pmid":"25151356","id":"PMC_25151356","title":"An 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biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/38886126","citation_count":2,"is_preprint":false},{"pmid":"41158261","id":"PMC_41158261","title":"DTX3 inhibits cell migration, invasion, and epithelial-mesenchymal transition in colorectal cancer through the AKT signaling pathway.","date":"2025","source":"Translational cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/41158261","citation_count":0,"is_preprint":false},{"pmid":"40715324","id":"PMC_40715324","title":"Hepatocyte reporter cells and integrated metabolomic and transcriptomic analyses reveal insights into hepatocyte changes in offspring of pregnancies with obesity.","date":"2025","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/40715324","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.04.09.648013","title":"Deltex and RING-UIM E3 ligases cooperate to create a ubiquitin-ADP-ribose hybrid mark on tankyrase, promoting its stabilization","date":"2025-04-09","source":"bioRxiv","url":"https://doi.org/10.1101/2025.04.09.648013","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":18506,"output_tokens":2824,"usd":0.048939,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10151,"output_tokens":3472,"usd":0.068778,"stage2_stop_reason":"end_turn"},"total_usd":0.117717,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2003,\n      \"finding\": \"DTX3, like other DTX family members (DTX1, DTX2), functions as an E3 ubiquitin-protein isopeptide ligase, demonstrated by its capacity for self-ubiquitination in vitro. DTX family members homodimerize and heterodimerize in vivo, and physical interactions between DTX family members modify E3 activity and/or substrate availability.\",\n      \"method\": \"In vitro self-ubiquitination assay, yeast two-hybrid screen, co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro E3 ligase activity demonstrated by self-ubiquitination assay; dimerization confirmed by Co-IP; multiple orthogonal methods in single study\",\n      \"pmids\": [\"12670957\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DTX3 ubiquitinates NOTCH2, promoting its degradation. DTX3 overexpression suppressed proliferation and tumorigenicity of esophageal carcinoma cells, and DTX3 was identified as a novel E3 ligase for NOTCH2 by yeast two-hybrid screening.\",\n      \"method\": \"Yeast two-hybrid screening, ubiquitination assay, overexpression/knockdown with cell proliferation and migration readouts\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — substrate identified by Y2H and ubiquitination assay; functional phenotype confirmed by gain/loss-of-function; single lab, two orthogonal methods\",\n      \"pmids\": [\"31854042\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DCAF13 binds the AU-rich element (ARE) in the DTX3 mRNA 3'UTR and accelerates its degradation, acting as an RNA-binding protein. Reduced DTX3 levels consequently activate NOTCH4 signaling in triple-negative breast cancer.\",\n      \"method\": \"RNA-binding protein assay (RBP-ARE interaction), mRNA stability assay, overexpression/knockdown with signaling readouts\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RBP-ARE binding and mRNA decay demonstrated; functional pathway consequence (NOTCH4 activation) shown; single lab\",\n      \"pmids\": [\"33300431\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DTX3 promotes ubiquitination and proteasomal degradation of NOTCH4 in triple-negative breast cancer cells.\",\n      \"method\": \"Ubiquitination assay, overexpression/knockdown with western blot for NOTCH4 protein levels\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitination and degradation of NOTCH4 shown; functional consequence demonstrated; single lab\",\n      \"pmids\": [\"33300431\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DTX3 interacts with mutant p53 in ovarian carcinoma cells, mediates its ubiquitination and stabilization by perturbing the MDM2-mutant p53 interaction, and consequently activates mutant p53 target genes. DTX3 depletion suppressed ovarian cancer cell proliferation and invasion in a mutant p53-dependent manner.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, overexpression/knockdown with cell proliferation, invasion, and in vivo tumor growth assays\",\n      \"journal\": \"Genes & diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and ubiquitination assay; functional phenotype confirmed in vitro and in vivo; single lab, multiple methods\",\n      \"pmids\": [\"35782979\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DTX3 co-localizes with XRCC5 (Ku80) in the nucleus, promotes its ubiquitination, and inhibits AKT signaling, thereby suppressing epithelial-mesenchymal transition in papillary thyroid carcinoma cells.\",\n      \"method\": \"IP-mass spectrometry, co-immunoprecipitation, immunofluorescence co-localization, ubiquitination assay, overexpression/knockdown with EMT and AKT signaling readouts\",\n      \"journal\": \"Journal of Cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — substrate (XRCC5) identified by IP-MS and confirmed by Co-IP; ubiquitination shown; nuclear co-localization by immunofluorescence; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"33403043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DTX3 overexpression reduced E2F1 transcriptional activity and downstream target gene expression (CDC2, Cyclin D3), inhibiting CRC cell proliferation and colony formation, while DTX3 knockout had the opposite effect.\",\n      \"method\": \"Overexpression/knockout with cell proliferation, colony formation assays; transcriptional reporter/western blot for E2F1 target genes\",\n      \"journal\": \"Molecular biology reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — functional phenotype with pathway readout; no direct biochemical interaction between DTX3 and E2F1 demonstrated; single lab, single approach\",\n      \"pmids\": [\"35098394\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DTX3 (like DTX3L, but not DTX1, DTX2, or DTX4) directly ubiquitylates DNA and RNA in vitro via ester bond formation, with preference for 3'-terminal adenosine. This nucleic acid ubiquitylation is reversible by deubiquitylases USP2, JOSD1, and SARS-CoV-2 PLpro.\",\n      \"method\": \"In vitro ubiquitylation assay with purified components, biochemical characterization of ester-bond linkage, DUB reversal assay\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro reconstitution with purified proteins; multiple DUBs tested for reversal; substrate preference characterized; novel activity rigorously demonstrated in single study with multiple orthogonal biochemical methods\",\n      \"pmids\": [\"39242775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A novel N-terminal isoform of DTX3 (DTX3c) associates with UBA1 (E1), UBE2N (E2), and Cdc48/p97 ATPase as part of a complex that ubiquitinates EphB4 kinase at its C-tail upon IGF-II signal deprivation, promoting EphB4 degradation. Cdc48/p97 ATPase activity was required for EphB4 recruitment to this complex.\",\n      \"method\": \"Targeted proteomics, co-immunoprecipitation, PCR cloning (isoform identification), 3D modeling\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — complex components identified by targeted proteomics and confirmed by Co-IP; functional ATPase requirement shown; novel isoform cloned; single lab, multiple methods\",\n      \"pmids\": [\"37108544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DTX3 catalyzes monoubiquitylation of tankyrase in cells, occurring on mono-ADP-ribose (MAR) rather than a canonical lysine, creating a monoubiquitin-MAR hybrid mark. This mark prevents PAR formation on tankyrase, antagonizing RNF146-mediated degradation and thereby stabilizing tankyrase. The hybrid mark is subsequently recognized and extended by RING-UIM E3 ligases RNF114 and RNF166.\",\n      \"method\": \"Cell-based ubiquitylation assays, biochemical characterization of ubiquitin-MAR linkage, genetic epistasis with RNF146/RNF114/RNF166\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — non-canonical ubiquitylation site (MAR) demonstrated biochemically in cells; epistatic relationship with RNF146 and stabilization outcome shown; preprint, single lab, not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.04.09.648013\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DTX3 binds to the Notch intracellular domain (NICD) via its C-terminal RING finger domain, promotes NICD ubiquitination and degradation, and thereby suppresses Notch pathway activation, inhibiting bladder cancer cell migration and invasion. The Notch inhibitor DAPT partially reversed the effects of DTX3 knockdown on metastatic ability.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, overexpression/knockdown with migration/invasion assays in vitro and in vivo; domain mapping\",\n      \"journal\": \"International immunopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — NICD binding confirmed by Co-IP; ubiquitination/degradation demonstrated; RING domain mapped as binding domain; epistasis with DAPT inhibitor; single lab\",\n      \"pmids\": [\"40127622\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DTX3 is a RING finger-containing E3 ubiquitin ligase that ubiquitinates multiple substrates including NOTCH2, NOTCH4, NICD, XRCC5, mutant p53, and EphB4 (via its novel DTX3c isoform), typically promoting their degradation and suppressing oncogenic signaling pathways (Notch, AKT, mutant p53); it also catalyzes non-canonical ubiquitylation of nucleic acids and of mono-ADP-ribose on tankyrase via ester bonds, and can homodimerize and heterodimerize with other DTX family members to modulate E3 activity; its own mRNA is subject to post-transcriptional regulation by the RNA-binding protein DCAF13.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DTX3 is a RING finger E3 ubiquitin ligase that ubiquitinates a range of protein substrates and thereby restrains oncogenic signaling [#0, #1]. Its canonical activity targets Notch-family proteins for degradation: DTX3 ubiquitinates NOTCH2 [#1] and NOTCH4 [#3], and binds the Notch intracellular domain (NICD) through its C-terminal RING domain to drive its ubiquitination and proteasomal turnover, suppressing Notch pathway activation [#10]. Beyond Notch, DTX3 ubiquitinates XRCC5 (Ku80) in the nucleus to inhibit AKT signaling [#5], and stabilizes mutant p53 by perturbing the MDM2–mutant p53 interaction, illustrating that its ubiquitination output is not uniformly degradative [#4]. Across these contexts DTX3 generally acts as a tumor suppressor, with overexpression reducing proliferation, migration, and invasion [#1, #10]. DTX3 also catalyzes non-canonical ubiquitylation: it directly modifies DNA and RNA in vitro via ester-bond formation with preference for 3'-terminal adenosine [#7]. A novel N-terminal isoform, DTX3c, assembles with UBA1, UBE2N and the Cdc48/p97 ATPase to ubiquitinate EphB4 upon IGF-II deprivation [#8]. DTX3 family members homo- and heterodimerize, modulating E3 activity and substrate availability [#0], and DTX3 mRNA is itself destabilized by the RNA-binding protein DCAF13, which acts on a 3'UTR AU-rich element [#2].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Established DTX3 as a catalytically active E3 ligase and revealed that DTX family members physically associate to modulate one another's activity, framing DTX3 within a regulatable ligase network.\",\n      \"evidence\": \"In vitro self-ubiquitination assay, yeast two-hybrid, and Co-IP demonstrating dimerization\",\n      \"pmids\": [\"12670957\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No physiological substrate identified at this stage\", \"Functional consequence of dimerization on specific targets not defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified Notch receptors as DTX3 substrates, defining a degradative axis that links DTX3 to suppression of Notch-driven tumor phenotypes.\",\n      \"evidence\": \"Y2H, ubiquitination assays, and gain/loss-of-function in esophageal carcinoma (NOTCH2) and triple-negative breast cancer (NOTCH4)\",\n      \"pmids\": [\"31854042\", \"33300431\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ubiquitin chain topology not defined\", \"Direct vs indirect ubiquitination of receptor not fully resolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed DTX3 itself is post-transcriptionally controlled, placing it downstream of an RNA-decay pathway that derepresses Notch signaling when DTX3 is lost.\",\n      \"evidence\": \"RBP-ARE binding and mRNA stability assays for DCAF13 in triple-negative breast cancer\",\n      \"pmids\": [\"33300431\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Upstream regulators of DCAF13 not addressed\", \"Generality of this control across tissues unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated that DTX3 ubiquitination can stabilize rather than degrade a substrate, by acting on mutant p53 and perturbing MDM2 engagement.\",\n      \"evidence\": \"Reciprocal Co-IP, ubiquitination assay, and in vitro/in vivo functional assays in ovarian carcinoma\",\n      \"pmids\": [\"35782979\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ubiquitin linkage type producing stabilization not characterized\", \"Whether wild-type p53 is similarly affected unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Extended DTX3 substrates to nuclear XRCC5 (Ku80) and connected its ligase activity to AKT-driven EMT suppression.\",\n      \"evidence\": \"IP-MS, Co-IP, immunofluorescence co-localization, and ubiquitination assay in papillary thyroid carcinoma\",\n      \"pmids\": [\"33403043\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic link between XRCC5 ubiquitination and AKT signaling not detailed\", \"Fate of ubiquitinated XRCC5 not established\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Linked DTX3 to E2F1 transcriptional output and cell-cycle gene expression in colorectal cancer, though without a direct biochemical connection.\",\n      \"evidence\": \"Overexpression/knockout with proliferation, colony formation, and E2F1 target readouts\",\n      \"pmids\": [\"35098394\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No direct DTX3–E2F1 interaction demonstrated\", \"Whether the effect is ligase-dependent unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined a DTX3c isoform-specific ubiquitination machine coupling DTX3 to the p97 ATPase and growth-factor signaling for EphB4 turnover.\",\n      \"evidence\": \"Targeted proteomics, Co-IP, isoform cloning, and 3D modeling identifying UBA1/UBE2N/Cdc48-p97 complex\",\n      \"pmids\": [\"37108544\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological scope of DTX3c beyond EphB4 unknown\", \"Direct ubiquitin transfer reconstitution not shown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed a non-protein activity, establishing that DTX3 ubiquitylates nucleic acids via reversible ester bonds with sequence preference.\",\n      \"evidence\": \"In vitro reconstitution with purified components, ester-bond characterization, and DUB reversal assays\",\n      \"pmids\": [\"39242775\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular substrates and biological role of nucleic acid ubiquitylation unknown\", \"Targeting/specificity determinants in cells undefined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed DTX3 writes a non-canonical ubiquitin-on-MAR hybrid mark on tankyrase that protects it from RNF146-mediated degradation, expanding DTX3 chemistry to ADP-ribose acceptors.\",\n      \"evidence\": \"Cell-based ubiquitylation assays, ubiquitin-MAR linkage characterization, and genetic epistasis with RNF146/RNF114/RNF166 (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.04.09.648013\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Not yet peer-reviewed\", \"Broader substrate range of the MAR-ubiquitin mark unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Confirmed direct NICD binding through the DTX3 RING domain, mapping the structural basis for Notch suppression and metastasis control.\",\n      \"evidence\": \"Co-IP, domain mapping, ubiquitination assay, and migration/invasion assays with DAPT epistasis in bladder cancer\",\n      \"pmids\": [\"40127622\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ubiquitin chain type on NICD not defined\", \"Relative contribution of NICD vs full-length receptor ubiquitination unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How DTX3 selects between degradative and stabilizing outcomes, and what governs its choice among protein, nucleic acid, and ADP-ribose acceptors in vivo, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model for substrate/linkage selectivity\", \"In vivo relevance of nucleic acid and MAR ubiquitylation not established\", \"Structural basis of multi-acceptor catalysis unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 1, 3, 4, 5, 7, 8, 9, 10]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [1, 3, 4, 5, 8, 10]},\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [0, 7, 9]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [7]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 3, 4, 5, 8, 10]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 5, 8, 10]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [1, 4, 5, 6, 10]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"NOTCH2\", \"NOTCH4\", \"XRCC5\", \"TP53\", \"EphB4\", \"UBA1\", \"UBE2N\", \"DCAF13\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}