{"gene":"TRIM16","run_date":"2026-04-28T21:43:00","timeline":{"discoveries":[{"year":2012,"finding":"TRIM16, despite lacking a classical RING domain, possesses E3 ubiquitin ligase activity via its B-box domains which adopt RING-like folds; it undergoes auto-polyubiquitination and catalyzes ubiquitination in vitro and in vivo. TRIM16 homodimerizes through its coiled-coil domain and heterodimerizes with TRIM24, PML, and MID1.","method":"3D structural modelling, in vitro and in vivo ubiquitination assays, co-immunoprecipitation, domain deletion mutants","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro reconstitution of ubiquitin ligase activity combined with structural modelling and reciprocal Co-IP for dimerization partners","pmids":["22629402"],"is_preprint":false},{"year":2010,"finding":"TRIM16 directly binds cytoplasmic vimentin and nuclear E2F1 in neuroblastoma cells; overexpression reduces cell motility (requiring vimentin downregulation) and translocates to the nucleus upon retinoid treatment to downregulate E2F1 and inhibit cell replication.","method":"Co-immunoprecipitation, subcellular fractionation, immunofluorescence, siRNA knockdown, overexpression with phenotypic readouts (migration, growth)","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP for binding partners with defined functional consequences (migration, replication) and direct localization experiments","pmids":["20729920"],"is_preprint":false},{"year":2009,"finding":"TRIM16 (EBBP) acts as a histone acetylase-associated protein that increases histone acetylation and de-represses RARβ2 and CYP26A1 transcription via the βRARE regulatory sequence; it inhibits cell growth through effects on cyclin D1 and phospho-Rb.","method":"Chromatin modifying agent treatments, overexpression, reporter assays, western blotting for cyclin D1 and phospho-Rb","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 — overexpression with multiple molecular readouts but single lab","pmids":["19147277"],"is_preprint":false},{"year":2011,"finding":"In squamous cell carcinoma cells, TRIM16 directly binds and downregulates nuclear E2F1 (required for replication) and directly binds and downregulates vimentin (required for reduced migration); the C-terminal RFP-like domain of TRIM16 is required for reduced cell migration. Nuclear translocation of TRIM16 is induced by retinoid treatment.","method":"Co-immunoprecipitation, domain deletion mutants, overexpression/knockdown with migration and proliferation assays, immunofluorescence","journal":"The Journal of pathology","confidence":"High","confidence_rationale":"Tier 2 — domain mapping combined with Co-IP and functional rescue experiments with defined phenotypic readouts","pmids":["22009481"],"is_preprint":false},{"year":2013,"finding":"TRIM16 exhibits dynamic nuclear-cytoplasmic localization during cell cycle progression: TRIM16 protein is upregulated and shifts to the nucleus during G1 phase. An uncharacterized domain within TRIM16 is required for both its nuclear localization and its growth inhibitory effects. TRIM16 regulates G1/S progression through changes in Cyclin D1 and p27 expression.","method":"Immunohistochemistry in TH-MYCN mouse model, cell cycle synchronization, TRIM16 deletion mutants, western blotting","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 — domain mapping with direct localization and functional consequence, single lab","pmids":["23422002"],"is_preprint":false},{"year":2013,"finding":"TRIM16 directly interacts with caspase-2 protein in breast cancer and neuroblastoma cells, co-localizes with caspase-2, increases procaspase-2 protein levels, and activates caspase-2 activity; caspase-2 activation is required for TRIM16-induced apoptosis.","method":"Co-immunoprecipitation, co-localization by immunofluorescence, caspase activity assays, overexpression with apoptosis readouts","journal":"Apoptosis : an international journal on programmed cell death","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP plus functional epistasis (caspase-2 required for TRIM16 apoptotic effect), single lab","pmids":["23404198"],"is_preprint":false},{"year":2014,"finding":"TRIM16 directly binds the IFNβ1 gene promoter (shown by chromatin immunoprecipitation) and regulates cell migration and proliferation in melanoma cells in an IFNβ1-dependent manner. BRAF inhibitor vemurafenib induces melanoma growth arrest in a TRIM16-dependent manner.","method":"Chromatin immunoprecipitation (ChIP), overexpression/knockdown with migration and proliferation assays, epistasis with IFNβ1 knockdown","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP demonstrating direct promoter binding with functional dependence on IFNβ1, single lab","pmids":["25333256"],"is_preprint":false},{"year":2018,"finding":"TRIM16 is an integral component of the p62-KEAP1-NRF2 complex; it stabilizes NRF2 via K63-linked ubiquitination, activating p62 and ubiquitin pathway genes, which leads to ubiquitination of misfolded proteins and protein aggregate formation. TRIM16 also acts as a scaffold protein that recruits p62, ULK1, ATG16L1, and LC3B to protein aggregates to facilitate their autophagic degradation (aggrephagy).","method":"Co-immunoprecipitation, ubiquitination assays, siRNA knockdown, overexpression, autophagy flux analysis, in vitro and in vivo stress models","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods (Co-IP, ubiquitination assay, autophagy flux) with in vivo validation, 126 citations","pmids":["30143514"],"is_preprint":false},{"year":2019,"finding":"TRIM16 controls K63-linked ubiquitination and stabilization of NRF2 (enhancing NRF2 activation), which upregulates SQSTM1/p62 and ubiquitin pathway proteins; TRIM16 physically localizes around protein aggregates and recruits SQSTM1 and autophagy initiation proteins (ULK1, ATG16L1, LC3B) to sequester aggregates into autophagosomes for degradation.","method":"Co-immunoprecipitation, ubiquitination assays, immunofluorescence, autophagy assays","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 1-2 — orthogonal methods confirming mechanistic model from the parent EMBO paper, consistent across publications","pmids":["30806139"],"is_preprint":false},{"year":2016,"finding":"RASSF6 promotes ubiquitination-dependent degradation of TRIM16, negatively regulating TRIM16 protein levels in esophageal squamous cell carcinoma and thereby activating cell cycle and EMT pathways.","method":"Co-immunoprecipitation, ubiquitination assay, overexpression/knockdown with phenotypic readouts","journal":"Journal of genetics and genomics = Yi chuan xue bao","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP plus ubiquitination assay identifying RASSF6 as upstream regulator of TRIM16 stability","pmids":["31812473"],"is_preprint":false},{"year":2020,"finding":"TRIM16 mediates polyubiquitination and proteasomal degradation of vimentin; the lncRNA VAL competes with TRIM16 binding to vimentin to prevent its ubiquitination and degradation, thereby stabilizing vimentin and promoting invasion.","method":"Co-immunoprecipitation, ubiquitination assay, RNA pulldown, competitive binding experiments, loss-of-function assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 — ubiquitination assay with competitive binding mechanism, orthogonal methods in single high-citation study","pmids":["33046716"],"is_preprint":false},{"year":2021,"finding":"TRIM16 directly binds and ubiquitinates Snail (Snail family transcriptional repressor 1) to promote its degradation, suppressing EMT in colorectal cancer; inhibition of Snail degradation abolishes the anti-metastatic effect of TRIM16.","method":"Co-immunoprecipitation, ubiquitination assay, Snail rescue experiments, in vitro and in vivo metastasis assays","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP and ubiquitination assay with epistasis rescue, single lab","pmids":["34265287"],"is_preprint":false},{"year":2019,"finding":"TRIM16 interacts with Galectin-3 via ULK1 in human bone marrow-derived mesenchymal stem cells; TRIM16 increases stability of ULK1 and Beclin1, and osteogenic induction enhances association between TRIM16 and ULK1/Beclin1, promoting autophagy and osteogenic differentiation.","method":"Co-immunoprecipitation, shRNA knockdown, overexpression, LC3 puncta immunofluorescence, ALP and Alizarin Red staining","journal":"Bone","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal Co-IP with functional readouts, single lab","pmids":["31521826"],"is_preprint":false},{"year":2021,"finding":"TRIM16 interacts with NLRP3 inflammasome and promotes K48-linked polyubiquitination of NLRP3, leading to its proteasomal degradation, thereby suppressing inflammasome activation, pyroptosis (caspase-1 and GSDMD cleavage), and inflammation in myocardial ischemia/reperfusion injury.","method":"Co-immunoprecipitation, ubiquitination assay, overexpression via adenoviral vectors in vivo, in vitro cardiomyocyte models","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP and ubiquitination assay with in vivo validation, single lab","pmids":["36208489"],"is_preprint":false},{"year":2022,"finding":"TRIM16 interacts with Prdx1 and inhibits its phosphorylation, enhancing downstream Nrf2 pathway activity; TRIM16 also directly interacts with and ubiquitinates Src kinase for its degradation, thereby blocking Prdx1 phosphorylation. This mechanism suppresses pathological cardiac hypertrophy.","method":"RNA-sequencing, interactome analysis, co-immunoprecipitation, ubiquitination assay, cardiac-specific knockout mice and AAV9 overexpression mice, transverse aortic constriction model","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 1-2 — unbiased interactome followed by Co-IP, ubiquitination assay, and in vivo genetic models with multiple orthogonal validations","pmids":["35437018"],"is_preprint":false},{"year":2021,"finding":"TRIM16 promotes osteogenic differentiation of human periodontal ligament stem cells by stabilizing RUNX2 protein: TRIM16 decreases CHIP-mediated K48-linked ubiquitination and degradation of RUNX2 without affecting RUNX2 mRNA levels.","method":"Co-immunoprecipitation, ubiquitination assay, shRNA knockdown, overexpression, ALP/Alizarin Red staining","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP and ubiquitination assay with functional osteogenic readouts, single lab","pmids":["33490087"],"is_preprint":false},{"year":2022,"finding":"EZH2 promotes DNMT1-mediated methylation of the TRIM16 promoter CpG island, leading to transcriptional silencing of TRIM16 in ovarian cancer cells; CRABP2 upregulates EZH2 to indirectly suppress TRIM16 expression.","method":"ChIP assay for DNMT1 enrichment at TRIM16 promoter, methylation analysis, co-immunoprecipitation (EZH2-CRABP2), siRNA knockdown/overexpression","journal":"Environmental toxicology","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP and promoter methylation assays with functional epistasis, single lab","pmids":["35442568"],"is_preprint":false},{"year":2023,"finding":"TRIM16 overexpression promotes K63-linked poly-ubiquitination of NRF2 (under basal conditions), activating the SQSTM1/NRF2/KEAP1 antioxidant pathway and reducing H5N1 avian influenza virus titer in A549 cells.","method":"Overexpression, ubiquitination assays specifying K63-linkage, antioxidant gene expression analysis, viral titer measurement","journal":"Viruses","confidence":"Medium","confidence_rationale":"Tier 2 — ubiquitination assay with linkage specificity and functional antiviral readout, single lab","pmids":["36851605"],"is_preprint":false},{"year":2022,"finding":"TRIM16 interacts with TRAF2 and promotes its ubiquitination, impeding NF-κB signaling and reducing inflammatory mediator (IL-6) expression in macrophages and colitis model.","method":"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, NF-κB pathway analysis, DSS-induced colitis model","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP and ubiquitination assay with in vivo validation, single lab","pmids":["41134044"],"is_preprint":false},{"year":2024,"finding":"TRIM16 mediates K63-linked ubiquitination of DAB2 at K656 via its SPRY domain, promoting DAB2-dependent endocytosis of integrin β1 and subsequent activation of FAK-STAT3 signaling, exacerbating vascular calcification in CKD.","method":"Immunoprecipitation-mass spectrometry, co-immunoprecipitation, ubiquitination assay with domain (SPRY) and site (K656) mapping, siRNA/adenovirus, smooth muscle-specific TRIM16 knockout mice, CKD rat and mouse models","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 1-2 — unbiased IP-MS discovery followed by domain/site-specific ubiquitination assays and in vivo genetic models","pmids":["40575853"],"is_preprint":false},{"year":2023,"finding":"TRIM16-mediated lysophagy (lysosome-selective autophagy) is activated upon lysosomal membrane permeabilization (detected by galectin-3 accumulation) and suppresses high-glucose-induced amyloid β accumulation in neurons; impaired TRIM16-mediated lysophagy leads to lysosomal dysfunction.","method":"siRNA knockdown, overexpression, immunofluorescence for galectin-3 and LC3 puncta, lysosome function assays, iPSC-derived neuronal cells","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization and lysosomal function assays with functional consequence, single lab","pmids":["37357416"],"is_preprint":false},{"year":2021,"finding":"TRIM16-mediated lysophagy is impaired in COPD; cigarette smoke extract induces lysosomal membrane permeabilization (galectin-3 puncta), and TRIM16 cooperates with galectin-3 to recognize damaged lysosomes and initiate lysophagy; reduced TRIM16 leads to lysosomal dysfunction and accelerated cellular senescence.","method":"siRNA knockdown, immunofluorescence, galectin-3 accumulation assay, senescence assays, human COPD lung tissues","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"Medium","confidence_rationale":"Tier 2 — functional lysophagy assays with direct cellular senescence readout in disease-relevant specimens, single lab","pmids":["34135057"],"is_preprint":false},{"year":2025,"finding":"TRIM16 promotes secretory autophagy in cancer-associated fibroblasts: TRIM16 traffics to autophagosomes, colocalizes with LC3B, IL6, SEC22B, SNAP23, VAMP3, and STX4; TRIM16 knockdown reduces autophagosomes at the plasma membrane and decreases IL6 secretion from CAFs.","method":"Transmission electron microscopy, live-cell imaging, immunofluorescence, unbiased LC3B immunoprecipitation proteomics (LC-MS/MS), TRIM16 knockdown, HNSCC patient tissue immunohistochemistry","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 — unbiased proteomics plus colocalization and functional knockdown with IL6 secretion readout","pmids":["40383937"],"is_preprint":false},{"year":2024,"finding":"NPRL2 increases TRIM16 expression via inactivation of ERK1/2 signaling; TRIM16 promotes ubiquitination-mediated degradation of Galectin-3, diminishing Gal-3 release from glioma cells and preventing Gal-3-induced CD8+ T cell cuproptosis.","method":"Co-immunoprecipitation, ubiquitination assay, ERK inhibitor treatment, siRNA knockdown, flow cytometry for cuproptosis markers","journal":"Cellular and molecular life sciences : CMLS","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP and ubiquitination assay with signaling pathway epistasis, single lab","pmids":["39367988"],"is_preprint":false},{"year":2025,"finding":"TRIM16 (EBBP) interacts with GRP78 to promote its K63-linked ubiquitination, disrupting the inhibitory GRP78-PERK interaction and activating PERK-mediated integrated stress response (ISR), which activates ATF4 and Nrf2 to upregulate SLC7A11/GSH/GPX4 axis and restore iron homeostasis, suppressing ferroptosis in anthracycline-induced cardiotoxicity.","method":"Bulk RNA-seq, molecular docking, co-immunoprecipitation, ubiquitination assay, cardiac-specific overexpression, PERK inhibitor epistasis, ferroptosis assays","journal":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP and ubiquitination assay with pharmacological epistasis and in vivo overexpression, single lab","pmids":["40491313"],"is_preprint":false},{"year":2025,"finding":"TRIM16 directly binds to and ubiquitinates Snai1 via K48-linkage at K146, promoting its degradation, and thereby promotes ferroptosis in TNF-α-stimulated fibroblast-like synoviocytes.","method":"Co-immunoprecipitation, ubiquitination assay with K48-linkage specificity and site mapping (K146), lipid ROS measurement, rescue experiments","journal":"International immunopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 — site-specific ubiquitination assay with functional ferroptosis readout, single lab","pmids":["40991993"],"is_preprint":false},{"year":2025,"finding":"TRIM16 directly binds and stabilizes YAP1 through K63-linked ubiquitination, facilitating YAP1 nuclear translocation, which enhances Nrf2 activation and antioxidant gene expression to protect against sepsis-induced acute liver injury.","method":"Co-immunoprecipitation, K63-linkage specific ubiquitination assay, nuclear fractionation, siRNA/AAV9-overexpression, CLP sepsis model in vivo","journal":"Cell & bioscience","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP, ubiquitination assay, localization study with in vivo CLP model, single lab","pmids":["41437125"],"is_preprint":false},{"year":2023,"finding":"TRIM16 modulates TAK1 by ubiquitinating and degrading phospho-TAK1 (p-TAK1), blocking JNK and p38MAPK activation; TRIM16 also elevates YAP levels and facilitates its nuclear translocation, promoting Nrf2 expression and reducing oxidative stress and inflammation in DOX-induced cardiotoxicity.","method":"Co-immunoprecipitation, ubiquitination assay, siRNA/AAV9 overexpression, TAK1 inhibitor (Takinib) epistasis, NRCMs and in vivo DOX model","journal":"Biochemical pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP, ubiquitination, and pharmacological epistasis, single lab","pmids":["38154547"],"is_preprint":false},{"year":2025,"finding":"TRIM16 acts as an E3 ubiquitin ligase for OPTN (optineurin), promoting its ubiquitin-mediated proteasomal degradation to suppress mitophagy in glioblastoma cells; TRIM16 depletion or OPTN overexpression reverses this suppression of autophagy.","method":"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown/overexpression, autophagy flux analysis, GBM xenograft model","journal":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP and ubiquitination assay with epistasis rescue, single lab","pmids":["40990506"],"is_preprint":false},{"year":2022,"finding":"TRIM16 promotes pancreatic cancer metastasis and aerobic glycolysis in a ligase-independent manner by competing with TRAF3 (NIK's E3 ligase) at the ISIIAQA motif of NIK, thereby stabilizing NIK protein and upregulating SIX1 transcription factor to enhance glycolysis.","method":"Co-immunoprecipitation, competitive binding assay, ubiquitination assay, NIK inhibitor treatment, in vitro and in vivo metastasis/glycolysis assays","journal":"American journal of cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP with competitive binding mechanism and pharmacological epistasis, single lab","pmids":["36504902"],"is_preprint":false},{"year":2025,"finding":"TRIM16 mediates K63-linked ubiquitination of FGF7, promoting its degradation; METTL14 enhances TRIM16 mRNA stability via m6A methylation, and hypoxia-induced exosomal METTL14 modulates this axis to affect TNBC cell proliferation, metastasis, and glycolysis.","method":"Co-immunoprecipitation, ubiquitination assay, MeRIP, RIP, dual-luciferase reporter assay, xenograft tumor model","journal":"Breast cancer research : BCR","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP and ubiquitination assay identifying FGF7 as TRIM16 substrate, with m6A regulation of TRIM16, single lab","pmids":["40796898"],"is_preprint":false},{"year":2024,"finding":"TRIM16 interacts with NFKBIZ and promotes K48-linked ubiquitination of NFKBIZ, leading to its degradation, which modulates NFκB signaling in hepatocellular carcinoma cells.","method":"Co-immunoprecipitation, protein degradation assay, flow cytometry, western blot, immunofluorescence","journal":"Cellular and molecular life sciences : CMLS","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP and ubiquitination with linkage specificity, single lab","pmids":["38581570"],"is_preprint":false},{"year":1998,"finding":"TRIM16 (EBBP) was identified as an estrogen- and antiestrogen-regulated gene; the encoded protein has predominantly cytoplasmic localization and belongs to the B-box zinc finger protein family. Regulation of EBBP by tamoxifen can occur through a mutated ER that lacks normal estrogen responsiveness, indicating distinct molecular mechanisms for estrogen vs. antiestrogen regulation.","method":"Northern blot, subcellular fractionation, cycloheximide sensitivity assay, ER mutant stable transfection","journal":"Molecular endocrinology (Baltimore, Md.)","confidence":"Medium","confidence_rationale":"Tier 2-3 — foundational characterization with direct localization and estrogen receptor epistasis","pmids":["9817599"],"is_preprint":false}],"current_model":"TRIM16 is an atypical TRIM-family E3 ubiquitin ligase that uses RING-like B-box domains (not a classical RING) to catalyze both K48- and K63-linked ubiquitination of diverse substrates including NRF2, vimentin, Snail, NLRP3, TRAF2, Src, DAB2, OPTN, FGF7, and NFKBIZ; it acts as a scaffold that recruits p62, ULK1, ATG16L1, and LC3B to coordinate aggrephagy and lysophagy of stressed/damaged organelles, and it undergoes dynamic nuclear-cytoplasmic shuttling during the cell cycle to suppress E2F1-driven replication and modulate IFNβ1-dependent migration, collectively maintaining proteostasis, antioxidant (Nrf2/KEAP1/p62), and inflammatory (NF-κB) homeostasis."},"narrative":{"teleology":[{"year":1998,"claim":"The initial identification of TRIM16 (EBBP) as an estrogen/antiestrogen-regulated cytoplasmic B-box protein established it as a hormonally controlled gene of unknown function, setting the stage for later mechanistic work.","evidence":"Northern blot, subcellular fractionation, and ER mutant epistasis in breast cancer cells","pmids":["9817599"],"confidence":"Medium","gaps":["No enzymatic activity characterized","No substrates identified","Mechanism of antiestrogen regulation via mutant ER unclear"]},{"year":2009,"claim":"Discovery that TRIM16 associates with histone acetylation and de-represses RARβ2 transcription while inhibiting cell growth via cyclin D1/phospho-Rb established TRIM16 as a transcription-associated growth suppressor, though the mechanism was unclear.","evidence":"Reporter assays and western blotting for cell cycle proteins in neuroblastoma cells","pmids":["19147277"],"confidence":"Medium","gaps":["No direct enzymatic mechanism defined","Histone acetyltransferase association indirect","Single cell line context"]},{"year":2010,"claim":"Identification of vimentin and E2F1 as direct TRIM16 binding partners, and demonstration of retinoid-induced nuclear translocation, established TRIM16 as a dual-compartment regulator of migration and replication.","evidence":"Co-immunoprecipitation, subcellular fractionation, and siRNA rescue in neuroblastoma and SCC cells","pmids":["20729920","22009481"],"confidence":"High","gaps":["Mechanism of vimentin/E2F1 downregulation unknown (degradation vs. transcriptional)","Nuclear translocation signal uncharacterized"]},{"year":2012,"claim":"Structural and biochemical demonstration that TRIM16 possesses E3 ubiquitin ligase activity through its B-box domains (not a classical RING) resolved the fundamental question of how an atypical TRIM protein catalyzes ubiquitination.","evidence":"3D structural modelling, in vitro and in vivo ubiquitination assays, domain deletion mutants, Co-IP for TRIM24/PML/MID1 heterodimerization","pmids":["22402"],"confidence":"High","gaps":["No crystal structure obtained","Physiological substrates not yet linked to this ligase activity","E2 partner preference undefined"]},{"year":2013,"claim":"Characterization of cell-cycle-dependent nuclear-cytoplasmic shuttling of TRIM16 and its interaction with caspase-2 expanded the functional model to include G1/S checkpoint control and apoptosis induction.","evidence":"Cell cycle synchronization with domain deletion mutants, caspase-2 Co-IP and activity assays in neuroblastoma/breast cancer cells","pmids":["23422002","23404198"],"confidence":"Medium","gaps":["Nuclear localization signal within TRIM16 not mapped","Direct caspase-2 activation mechanism unclear","Caspase-2 interaction not confirmed by independent group"]},{"year":2014,"claim":"ChIP evidence that TRIM16 directly binds the IFNβ1 promoter and controls migration/proliferation in an IFNβ1-dependent manner revealed a direct transcriptional regulatory function beyond ubiquitin ligase activity.","evidence":"Chromatin immunoprecipitation, epistasis with IFNβ1 knockdown in melanoma cells","pmids":["25333256"],"confidence":"Medium","gaps":["Mechanism of transcriptional activation at the promoter not defined","Whether TRIM16 acts as a transcription factor or co-factor unclear","Single cancer type tested"]},{"year":2018,"claim":"The pivotal discovery that TRIM16 stabilizes NRF2 via K63-linked ubiquitination within the p62-KEAP1-NRF2 complex and scaffolds autophagy machinery (p62, ULK1, ATG16L1, LC3B) onto aggregates unified TRIM16's ligase and scaffolding functions into a coherent aggrephagy pathway.","evidence":"Co-IP, ubiquitination assays with linkage specificity, autophagy flux analysis, in vivo stress models","pmids":["30143514","30806139"],"confidence":"High","gaps":["Structural basis of scaffold assembly unknown","Whether TRIM16 ubiquitinates autophagy adaptors directly or only NRF2 unclear","Relative contribution of ligase vs. scaffold function not dissected"]},{"year":2020,"claim":"Demonstration that TRIM16 ubiquitinates vimentin for proteasomal degradation — and that lncRNA VAL competitively blocks this interaction — provided the first defined ubiquitination substrate linking TRIM16 ligase activity to EMT suppression.","evidence":"Ubiquitination assay, RNA pulldown, competitive binding experiments in hepatocellular carcinoma","pmids":["33046716"],"confidence":"High","gaps":["Ubiquitin chain linkage type on vimentin not specified","Whether other lncRNAs similarly regulate TRIM16 substrate access unknown"]},{"year":2021,"claim":"Expansion of the substrate repertoire to Snail (K48-linked degradation suppressing EMT), NLRP3 (K48-linked degradation suppressing inflammasome), and damaged lysosomes (galectin-3-dependent lysophagy) established TRIM16 as a multi-substrate ligase with context-dependent anti-inflammatory and proteostatic roles.","evidence":"Co-IP and ubiquitination assays with epistasis rescue for Snail/NLRP3; galectin-3 puncta and senescence assays in COPD tissues and iPSC neurons","pmids":["34265287","36208489","34135057","37357416"],"confidence":"Medium","gaps":["How TRIM16 selects among diverse substrates is unknown","Lysophagy mechanism details (galectin-3–TRIM16 structural interface) not resolved","NLRP3 finding from single lab"]},{"year":2022,"claim":"Identification of Src kinase as a TRIM16 substrate (ubiquitination and degradation) in cardiac hypertrophy, and of TRAF2/NFKBIZ as substrates suppressing NF-κB signaling, broadened the functional scope to cardioprotection and inflammatory homeostasis.","evidence":"Unbiased interactome followed by Co-IP and ubiquitination assays; cardiac-specific knockout mice (Src); DSS colitis model (TRAF2); HCC cells (NFKBIZ)","pmids":["35437018","41134044","38581570"],"confidence":"High","gaps":["Whether Src ubiquitination uses K48 or K63 linkage not specified","TRAF2 ubiquitin chain type not defined","Cardiac-specific vs. systemic functions not fully delineated"]},{"year":2024,"claim":"Site-specific mapping of TRIM16-mediated K63-linked ubiquitination of DAB2 at K656 via the SPRY domain, promoting integrin β1 endocytosis, demonstrated a non-degradative signaling role and identified the SPRY domain as a substrate-recognition module.","evidence":"IP-MS, Co-IP, site-mapping ubiquitination assay, smooth muscle-specific TRIM16 knockout mice in CKD models","pmids":["40575853"],"confidence":"High","gaps":["Whether SPRY domain mediates recognition of other substrates not tested","Pro-calcification role contrasts with generally protective functions — context-dependency not resolved"]},{"year":2025,"claim":"Recent studies identified additional substrates (FGF7, OPTN, YAP1, GRP78) and a secretory autophagy function, revealing that TRIM16 regulates mitophagy suppression (via OPTN degradation), integrated stress response activation (via GRP78 K63-ubiquitination/PERK release), ferroptosis modulation (via Snail K48-ubiquitination at K146), and unconventional IL-6 secretion from cancer-associated fibroblasts.","evidence":"Co-IP, linkage- and site-specific ubiquitination assays, LC3B proteomics, cardiac overexpression models, GBM xenografts, CAF imaging","pmids":["40491313","40990506","40796898","41437125","40383937"],"confidence":"Medium","gaps":["Secretory autophagy mechanism and cargo selection not fully defined","GRP78 ubiquitination as PERK activator requires independent validation","How TRIM16 simultaneously promotes lysophagy/aggrephagy yet suppresses mitophagy is paradoxical and unresolved"]},{"year":null,"claim":"The structural basis for TRIM16's substrate selectivity among its many targets, the E2 ubiquitin-conjugating enzyme partners, the mechanism distinguishing its K48 vs. K63 linkage specificity, and how its ligase-dependent vs. scaffold-dependent functions are regulated remain open questions.","evidence":"","pmids":[],"confidence":"High","gaps":["No crystal or cryo-EM structure of TRIM16","E2 conjugating enzyme specificity undefined","Mechanism governing K48 vs. K63 linkage choice unknown","Relative in vivo contribution of ligase vs. scaffold function not genetically dissected"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,7,8,10,11,13,14,19,25,28,30,31]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[2,6]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[7,8,29]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,32]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,3,4]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[22]}],"pathway":[{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[7,8,20,21,22]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,10,11,13,14,19,25,28,30,31]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[7,8,17,24]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[13,18,21]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[4]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[5]}],"complexes":["p62-KEAP1-NRF2 complex"],"partners":["SQSTM1","NRF2","ULK1","LGALS3","VIM","TRIM24","SNAI1","DAB2"],"other_free_text":[]},"mechanistic_narrative":"TRIM16 is an atypical TRIM-family E3 ubiquitin ligase that uses RING-like B-box domains to catalyze both K48- and K63-linked ubiquitination of a broad substrate repertoire, functioning as a central coordinator of proteostasis, selective autophagy, antioxidant defense, and inflammatory signaling. It stabilizes NRF2 through K63-linked ubiquitination within the p62-KEAP1-NRF2 complex and scaffolds p62, ULK1, ATG16L1, and LC3B onto protein aggregates and damaged lysosomes to drive aggrephagy and lysophagy [PMID:30143514, PMID:37357416, PMID:34135057]. TRIM16 ubiquitinates and targets for degradation diverse substrates including vimentin (K48), Snail (K48, K146), NLRP3 (K48), TRAF2, Src, OPTN, NFKBIZ, DAB2, and FGF7, thereby suppressing EMT, inflammasome activation, and NF-κB signaling in context-dependent manners [PMID:33046716, PMID:34265287, PMID:36208489, PMID:35437018, PMID:40575853]. TRIM16 undergoes dynamic nuclear-cytoplasmic shuttling during the cell cycle, directly binds and downregulates E2F1 to inhibit G1/S progression, and binds the IFNβ1 promoter to regulate migration [PMID:20729920, PMID:23422002, PMID:25333256]."},"prefetch_data":{"uniprot":{"accession":"O95361","full_name":"Tripartite motif-containing protein 16","aliases":["E3 ubiquitin-protein ligase TRIM16","Estrogen-responsive B box protein"],"length_aa":564,"mass_kda":64.0,"function":"E3 ubiquitin ligase that plays an essential role in the organization of autophagic response and ubiquitination upon lysosomal and phagosomal damages. Plays a role in the stress-induced biogenesis and degradation of protein aggresomes by regulating the p62-KEAP1-NRF2 signaling and particularly by modulating the ubiquitination levels and thus stability of NRF2. Acts as a scaffold protein and facilitates autophagic degradation of protein aggregates by interacting with p62/SQSTM, ATG16L1 and LC3B/MAP1LC3B. In turn, protects the cell against oxidative stress-induced cell death as a consequence of endomembrane damage","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/O95361/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TRIM16","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TRIM16","total_profiled":1310},"omim":[{"mim_id":"609505","title":"TRIPARTITE MOTIF-CONTAINING PROTEIN 16; TRIM16","url":"https://www.omim.org/entry/609505"},{"mim_id":"301143","title":"LONG INTERGENIC NONCODING RNA 1546; LINC01546","url":"https://www.omim.org/entry/301143"},{"mim_id":"193060","title":"VIMENTIN; VIM","url":"https://www.omim.org/entry/193060"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"},{"location":"Plasma membrane","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"esophagus","ntpm":141.5}],"url":"https://www.proteinatlas.org/search/TRIM16"},"hgnc":{"alias_symbol":["EBBP"],"prev_symbol":[]},"alphafold":{"accession":"O95361","domains":[{"cath_id":"3.30.160","chopping":"92-159","consensus_level":"medium","plddt":84.3582,"start":92,"end":159},{"cath_id":"-","chopping":"170-302","consensus_level":"medium","plddt":87.5748,"start":170,"end":302},{"cath_id":"2.60.120.920","chopping":"363-547","consensus_level":"high","plddt":92.1101,"start":363,"end":547},{"cath_id":"1.20.5","chopping":"303-339","consensus_level":"medium","plddt":83.9335,"start":303,"end":339}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O95361","model_url":"https://alphafold.ebi.ac.uk/files/AF-O95361-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O95361-F1-predicted_aligned_error_v6.png","plddt_mean":79.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TRIM16","jax_strain_url":"https://www.jax.org/strain/search?query=TRIM16"},"sequence":{"accession":"O95361","fasta_url":"https://rest.uniprot.org/uniprotkb/O95361.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O95361/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O95361"}},"corpus_meta":[{"pmid":"30143514","id":"PMC_30143514","title":"TRIM16 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RING-like folds; it undergoes auto-polyubiquitination and catalyzes ubiquitination in vitro and in vivo. TRIM16 homodimerizes through its coiled-coil domain and heterodimerizes with TRIM24, PML, and MID1.\",\n      \"method\": \"3D structural modelling, in vitro and in vivo ubiquitination assays, co-immunoprecipitation, domain deletion mutants\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro reconstitution of ubiquitin ligase activity combined with structural modelling and reciprocal Co-IP for dimerization partners\",\n      \"pmids\": [\"22629402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TRIM16 directly binds cytoplasmic vimentin and nuclear E2F1 in neuroblastoma cells; overexpression reduces cell motility (requiring vimentin downregulation) and translocates to the nucleus upon retinoid treatment to downregulate E2F1 and inhibit cell replication.\",\n      \"method\": \"Co-immunoprecipitation, subcellular fractionation, immunofluorescence, siRNA knockdown, overexpression with phenotypic readouts (migration, growth)\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP for binding partners with defined functional consequences (migration, replication) and direct localization experiments\",\n      \"pmids\": [\"20729920\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TRIM16 (EBBP) acts as a histone acetylase-associated protein that increases histone acetylation and de-represses RARβ2 and CYP26A1 transcription via the βRARE regulatory sequence; it inhibits cell growth through effects on cyclin D1 and phospho-Rb.\",\n      \"method\": \"Chromatin modifying agent treatments, overexpression, reporter assays, western blotting for cyclin D1 and phospho-Rb\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — overexpression with multiple molecular readouts but single lab\",\n      \"pmids\": [\"19147277\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In squamous cell carcinoma cells, TRIM16 directly binds and downregulates nuclear E2F1 (required for replication) and directly binds and downregulates vimentin (required for reduced migration); the C-terminal RFP-like domain of TRIM16 is required for reduced cell migration. Nuclear translocation of TRIM16 is induced by retinoid treatment.\",\n      \"method\": \"Co-immunoprecipitation, domain deletion mutants, overexpression/knockdown with migration and proliferation assays, immunofluorescence\",\n      \"journal\": \"The Journal of pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — domain mapping combined with Co-IP and functional rescue experiments with defined phenotypic readouts\",\n      \"pmids\": [\"22009481\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TRIM16 exhibits dynamic nuclear-cytoplasmic localization during cell cycle progression: TRIM16 protein is upregulated and shifts to the nucleus during G1 phase. An uncharacterized domain within TRIM16 is required for both its nuclear localization and its growth inhibitory effects. TRIM16 regulates G1/S progression through changes in Cyclin D1 and p27 expression.\",\n      \"method\": \"Immunohistochemistry in TH-MYCN mouse model, cell cycle synchronization, TRIM16 deletion mutants, western blotting\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — domain mapping with direct localization and functional consequence, single lab\",\n      \"pmids\": [\"23422002\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TRIM16 directly interacts with caspase-2 protein in breast cancer and neuroblastoma cells, co-localizes with caspase-2, increases procaspase-2 protein levels, and activates caspase-2 activity; caspase-2 activation is required for TRIM16-induced apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, co-localization by immunofluorescence, caspase activity assays, overexpression with apoptosis readouts\",\n      \"journal\": \"Apoptosis : an international journal on programmed cell death\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus functional epistasis (caspase-2 required for TRIM16 apoptotic effect), single lab\",\n      \"pmids\": [\"23404198\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TRIM16 directly binds the IFNβ1 gene promoter (shown by chromatin immunoprecipitation) and regulates cell migration and proliferation in melanoma cells in an IFNβ1-dependent manner. BRAF inhibitor vemurafenib induces melanoma growth arrest in a TRIM16-dependent manner.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), overexpression/knockdown with migration and proliferation assays, epistasis with IFNβ1 knockdown\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP demonstrating direct promoter binding with functional dependence on IFNβ1, single lab\",\n      \"pmids\": [\"25333256\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TRIM16 is an integral component of the p62-KEAP1-NRF2 complex; it stabilizes NRF2 via K63-linked ubiquitination, activating p62 and ubiquitin pathway genes, which leads to ubiquitination of misfolded proteins and protein aggregate formation. TRIM16 also acts as a scaffold protein that recruits p62, ULK1, ATG16L1, and LC3B to protein aggregates to facilitate their autophagic degradation (aggrephagy).\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, siRNA knockdown, overexpression, autophagy flux analysis, in vitro and in vivo stress models\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (Co-IP, ubiquitination assay, autophagy flux) with in vivo validation, 126 citations\",\n      \"pmids\": [\"30143514\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRIM16 controls K63-linked ubiquitination and stabilization of NRF2 (enhancing NRF2 activation), which upregulates SQSTM1/p62 and ubiquitin pathway proteins; TRIM16 physically localizes around protein aggregates and recruits SQSTM1 and autophagy initiation proteins (ULK1, ATG16L1, LC3B) to sequester aggregates into autophagosomes for degradation.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, immunofluorescence, autophagy assays\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — orthogonal methods confirming mechanistic model from the parent EMBO paper, consistent across publications\",\n      \"pmids\": [\"30806139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RASSF6 promotes ubiquitination-dependent degradation of TRIM16, negatively regulating TRIM16 protein levels in esophageal squamous cell carcinoma and thereby activating cell cycle and EMT pathways.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, overexpression/knockdown with phenotypic readouts\",\n      \"journal\": \"Journal of genetics and genomics = Yi chuan xue bao\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus ubiquitination assay identifying RASSF6 as upstream regulator of TRIM16 stability\",\n      \"pmids\": [\"31812473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRIM16 mediates polyubiquitination and proteasomal degradation of vimentin; the lncRNA VAL competes with TRIM16 binding to vimentin to prevent its ubiquitination and degradation, thereby stabilizing vimentin and promoting invasion.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, RNA pulldown, competitive binding experiments, loss-of-function assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ubiquitination assay with competitive binding mechanism, orthogonal methods in single high-citation study\",\n      \"pmids\": [\"33046716\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRIM16 directly binds and ubiquitinates Snail (Snail family transcriptional repressor 1) to promote its degradation, suppressing EMT in colorectal cancer; inhibition of Snail degradation abolishes the anti-metastatic effect of TRIM16.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, Snail rescue experiments, in vitro and in vivo metastasis assays\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP and ubiquitination assay with epistasis rescue, single lab\",\n      \"pmids\": [\"34265287\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRIM16 interacts with Galectin-3 via ULK1 in human bone marrow-derived mesenchymal stem cells; TRIM16 increases stability of ULK1 and Beclin1, and osteogenic induction enhances association between TRIM16 and ULK1/Beclin1, promoting autophagy and osteogenic differentiation.\",\n      \"method\": \"Co-immunoprecipitation, shRNA knockdown, overexpression, LC3 puncta immunofluorescence, ALP and Alizarin Red staining\",\n      \"journal\": \"Bone\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with functional readouts, single lab\",\n      \"pmids\": [\"31521826\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRIM16 interacts with NLRP3 inflammasome and promotes K48-linked polyubiquitination of NLRP3, leading to its proteasomal degradation, thereby suppressing inflammasome activation, pyroptosis (caspase-1 and GSDMD cleavage), and inflammation in myocardial ischemia/reperfusion injury.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, overexpression via adenoviral vectors in vivo, in vitro cardiomyocyte models\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP and ubiquitination assay with in vivo validation, single lab\",\n      \"pmids\": [\"36208489\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TRIM16 interacts with Prdx1 and inhibits its phosphorylation, enhancing downstream Nrf2 pathway activity; TRIM16 also directly interacts with and ubiquitinates Src kinase for its degradation, thereby blocking Prdx1 phosphorylation. This mechanism suppresses pathological cardiac hypertrophy.\",\n      \"method\": \"RNA-sequencing, interactome analysis, co-immunoprecipitation, ubiquitination assay, cardiac-specific knockout mice and AAV9 overexpression mice, transverse aortic constriction model\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — unbiased interactome followed by Co-IP, ubiquitination assay, and in vivo genetic models with multiple orthogonal validations\",\n      \"pmids\": [\"35437018\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRIM16 promotes osteogenic differentiation of human periodontal ligament stem cells by stabilizing RUNX2 protein: TRIM16 decreases CHIP-mediated K48-linked ubiquitination and degradation of RUNX2 without affecting RUNX2 mRNA levels.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, shRNA knockdown, overexpression, ALP/Alizarin Red staining\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP and ubiquitination assay with functional osteogenic readouts, single lab\",\n      \"pmids\": [\"33490087\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"EZH2 promotes DNMT1-mediated methylation of the TRIM16 promoter CpG island, leading to transcriptional silencing of TRIM16 in ovarian cancer cells; CRABP2 upregulates EZH2 to indirectly suppress TRIM16 expression.\",\n      \"method\": \"ChIP assay for DNMT1 enrichment at TRIM16 promoter, methylation analysis, co-immunoprecipitation (EZH2-CRABP2), siRNA knockdown/overexpression\",\n      \"journal\": \"Environmental toxicology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP and promoter methylation assays with functional epistasis, single lab\",\n      \"pmids\": [\"35442568\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRIM16 overexpression promotes K63-linked poly-ubiquitination of NRF2 (under basal conditions), activating the SQSTM1/NRF2/KEAP1 antioxidant pathway and reducing H5N1 avian influenza virus titer in A549 cells.\",\n      \"method\": \"Overexpression, ubiquitination assays specifying K63-linkage, antioxidant gene expression analysis, viral titer measurement\",\n      \"journal\": \"Viruses\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ubiquitination assay with linkage specificity and functional antiviral readout, single lab\",\n      \"pmids\": [\"36851605\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TRIM16 interacts with TRAF2 and promotes its ubiquitination, impeding NF-κB signaling and reducing inflammatory mediator (IL-6) expression in macrophages and colitis model.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, NF-κB pathway analysis, DSS-induced colitis model\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP and ubiquitination assay with in vivo validation, single lab\",\n      \"pmids\": [\"41134044\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TRIM16 mediates K63-linked ubiquitination of DAB2 at K656 via its SPRY domain, promoting DAB2-dependent endocytosis of integrin β1 and subsequent activation of FAK-STAT3 signaling, exacerbating vascular calcification in CKD.\",\n      \"method\": \"Immunoprecipitation-mass spectrometry, co-immunoprecipitation, ubiquitination assay with domain (SPRY) and site (K656) mapping, siRNA/adenovirus, smooth muscle-specific TRIM16 knockout mice, CKD rat and mouse models\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — unbiased IP-MS discovery followed by domain/site-specific ubiquitination assays and in vivo genetic models\",\n      \"pmids\": [\"40575853\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRIM16-mediated lysophagy (lysosome-selective autophagy) is activated upon lysosomal membrane permeabilization (detected by galectin-3 accumulation) and suppresses high-glucose-induced amyloid β accumulation in neurons; impaired TRIM16-mediated lysophagy leads to lysosomal dysfunction.\",\n      \"method\": \"siRNA knockdown, overexpression, immunofluorescence for galectin-3 and LC3 puncta, lysosome function assays, iPSC-derived neuronal cells\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization and lysosomal function assays with functional consequence, single lab\",\n      \"pmids\": [\"37357416\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRIM16-mediated lysophagy is impaired in COPD; cigarette smoke extract induces lysosomal membrane permeabilization (galectin-3 puncta), and TRIM16 cooperates with galectin-3 to recognize damaged lysosomes and initiate lysophagy; reduced TRIM16 leads to lysosomal dysfunction and accelerated cellular senescence.\",\n      \"method\": \"siRNA knockdown, immunofluorescence, galectin-3 accumulation assay, senescence assays, human COPD lung tissues\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional lysophagy assays with direct cellular senescence readout in disease-relevant specimens, single lab\",\n      \"pmids\": [\"34135057\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIM16 promotes secretory autophagy in cancer-associated fibroblasts: TRIM16 traffics to autophagosomes, colocalizes with LC3B, IL6, SEC22B, SNAP23, VAMP3, and STX4; TRIM16 knockdown reduces autophagosomes at the plasma membrane and decreases IL6 secretion from CAFs.\",\n      \"method\": \"Transmission electron microscopy, live-cell imaging, immunofluorescence, unbiased LC3B immunoprecipitation proteomics (LC-MS/MS), TRIM16 knockdown, HNSCC patient tissue immunohistochemistry\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — unbiased proteomics plus colocalization and functional knockdown with IL6 secretion readout\",\n      \"pmids\": [\"40383937\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NPRL2 increases TRIM16 expression via inactivation of ERK1/2 signaling; TRIM16 promotes ubiquitination-mediated degradation of Galectin-3, diminishing Gal-3 release from glioma cells and preventing Gal-3-induced CD8+ T cell cuproptosis.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, ERK inhibitor treatment, siRNA knockdown, flow cytometry for cuproptosis markers\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP and ubiquitination assay with signaling pathway epistasis, single lab\",\n      \"pmids\": [\"39367988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIM16 (EBBP) interacts with GRP78 to promote its K63-linked ubiquitination, disrupting the inhibitory GRP78-PERK interaction and activating PERK-mediated integrated stress response (ISR), which activates ATF4 and Nrf2 to upregulate SLC7A11/GSH/GPX4 axis and restore iron homeostasis, suppressing ferroptosis in anthracycline-induced cardiotoxicity.\",\n      \"method\": \"Bulk RNA-seq, molecular docking, co-immunoprecipitation, ubiquitination assay, cardiac-specific overexpression, PERK inhibitor epistasis, ferroptosis assays\",\n      \"journal\": \"Advanced science (Weinheim, Baden-Wurttemberg, Germany)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP and ubiquitination assay with pharmacological epistasis and in vivo overexpression, single lab\",\n      \"pmids\": [\"40491313\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIM16 directly binds to and ubiquitinates Snai1 via K48-linkage at K146, promoting its degradation, and thereby promotes ferroptosis in TNF-α-stimulated fibroblast-like synoviocytes.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay with K48-linkage specificity and site mapping (K146), lipid ROS measurement, rescue experiments\",\n      \"journal\": \"International immunopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — site-specific ubiquitination assay with functional ferroptosis readout, single lab\",\n      \"pmids\": [\"40991993\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIM16 directly binds and stabilizes YAP1 through K63-linked ubiquitination, facilitating YAP1 nuclear translocation, which enhances Nrf2 activation and antioxidant gene expression to protect against sepsis-induced acute liver injury.\",\n      \"method\": \"Co-immunoprecipitation, K63-linkage specific ubiquitination assay, nuclear fractionation, siRNA/AAV9-overexpression, CLP sepsis model in vivo\",\n      \"journal\": \"Cell & bioscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP, ubiquitination assay, localization study with in vivo CLP model, single lab\",\n      \"pmids\": [\"41437125\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRIM16 modulates TAK1 by ubiquitinating and degrading phospho-TAK1 (p-TAK1), blocking JNK and p38MAPK activation; TRIM16 also elevates YAP levels and facilitates its nuclear translocation, promoting Nrf2 expression and reducing oxidative stress and inflammation in DOX-induced cardiotoxicity.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, siRNA/AAV9 overexpression, TAK1 inhibitor (Takinib) epistasis, NRCMs and in vivo DOX model\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP, ubiquitination, and pharmacological epistasis, single lab\",\n      \"pmids\": [\"38154547\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIM16 acts as an E3 ubiquitin ligase for OPTN (optineurin), promoting its ubiquitin-mediated proteasomal degradation to suppress mitophagy in glioblastoma cells; TRIM16 depletion or OPTN overexpression reverses this suppression of autophagy.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown/overexpression, autophagy flux analysis, GBM xenograft model\",\n      \"journal\": \"Advanced science (Weinheim, Baden-Wurttemberg, Germany)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP and ubiquitination assay with epistasis rescue, single lab\",\n      \"pmids\": [\"40990506\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TRIM16 promotes pancreatic cancer metastasis and aerobic glycolysis in a ligase-independent manner by competing with TRAF3 (NIK's E3 ligase) at the ISIIAQA motif of NIK, thereby stabilizing NIK protein and upregulating SIX1 transcription factor to enhance glycolysis.\",\n      \"method\": \"Co-immunoprecipitation, competitive binding assay, ubiquitination assay, NIK inhibitor treatment, in vitro and in vivo metastasis/glycolysis assays\",\n      \"journal\": \"American journal of cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP with competitive binding mechanism and pharmacological epistasis, single lab\",\n      \"pmids\": [\"36504902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIM16 mediates K63-linked ubiquitination of FGF7, promoting its degradation; METTL14 enhances TRIM16 mRNA stability via m6A methylation, and hypoxia-induced exosomal METTL14 modulates this axis to affect TNBC cell proliferation, metastasis, and glycolysis.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, MeRIP, RIP, dual-luciferase reporter assay, xenograft tumor model\",\n      \"journal\": \"Breast cancer research : BCR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP and ubiquitination assay identifying FGF7 as TRIM16 substrate, with m6A regulation of TRIM16, single lab\",\n      \"pmids\": [\"40796898\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TRIM16 interacts with NFKBIZ and promotes K48-linked ubiquitination of NFKBIZ, leading to its degradation, which modulates NFκB signaling in hepatocellular carcinoma cells.\",\n      \"method\": \"Co-immunoprecipitation, protein degradation assay, flow cytometry, western blot, immunofluorescence\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP and ubiquitination with linkage specificity, single lab\",\n      \"pmids\": [\"38581570\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"TRIM16 (EBBP) was identified as an estrogen- and antiestrogen-regulated gene; the encoded protein has predominantly cytoplasmic localization and belongs to the B-box zinc finger protein family. Regulation of EBBP by tamoxifen can occur through a mutated ER that lacks normal estrogen responsiveness, indicating distinct molecular mechanisms for estrogen vs. antiestrogen regulation.\",\n      \"method\": \"Northern blot, subcellular fractionation, cycloheximide sensitivity assay, ER mutant stable transfection\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — foundational characterization with direct localization and estrogen receptor epistasis\",\n      \"pmids\": [\"9817599\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TRIM16 is an atypical TRIM-family E3 ubiquitin ligase that uses RING-like B-box domains (not a classical RING) to catalyze both K48- and K63-linked ubiquitination of diverse substrates including NRF2, vimentin, Snail, NLRP3, TRAF2, Src, DAB2, OPTN, FGF7, and NFKBIZ; it acts as a scaffold that recruits p62, ULK1, ATG16L1, and LC3B to coordinate aggrephagy and lysophagy of stressed/damaged organelles, and it undergoes dynamic nuclear-cytoplasmic shuttling during the cell cycle to suppress E2F1-driven replication and modulate IFNβ1-dependent migration, collectively maintaining proteostasis, antioxidant (Nrf2/KEAP1/p62), and inflammatory (NF-κB) homeostasis.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TRIM16 is an atypical TRIM-family E3 ubiquitin ligase that uses RING-like B-box domains to catalyze both K48- and K63-linked ubiquitination of a broad substrate repertoire, functioning as a central coordinator of proteostasis, selective autophagy, antioxidant defense, and inflammatory signaling. It stabilizes NRF2 through K63-linked ubiquitination within the p62-KEAP1-NRF2 complex and scaffolds p62, ULK1, ATG16L1, and LC3B onto protein aggregates and damaged lysosomes to drive aggrephagy and lysophagy [PMID:30143514, PMID:37357416, PMID:34135057]. TRIM16 ubiquitinates and targets for degradation diverse substrates including vimentin (K48), Snail (K48, K146), NLRP3 (K48), TRAF2, Src, OPTN, NFKBIZ, DAB2, and FGF7, thereby suppressing EMT, inflammasome activation, and NF-κB signaling in context-dependent manners [PMID:33046716, PMID:34265287, PMID:36208489, PMID:35437018, PMID:40575853]. TRIM16 undergoes dynamic nuclear-cytoplasmic shuttling during the cell cycle, directly binds and downregulates E2F1 to inhibit G1/S progression, and binds the IFNβ1 promoter to regulate migration [PMID:20729920, PMID:23422002, PMID:25333256].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"The initial identification of TRIM16 (EBBP) as an estrogen/antiestrogen-regulated cytoplasmic B-box protein established it as a hormonally controlled gene of unknown function, setting the stage for later mechanistic work.\",\n      \"evidence\": \"Northern blot, subcellular fractionation, and ER mutant epistasis in breast cancer cells\",\n      \"pmids\": [\"9817599\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No enzymatic activity characterized\", \"No substrates identified\", \"Mechanism of antiestrogen regulation via mutant ER unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Discovery that TRIM16 associates with histone acetylation and de-represses RARβ2 transcription while inhibiting cell growth via cyclin D1/phospho-Rb established TRIM16 as a transcription-associated growth suppressor, though the mechanism was unclear.\",\n      \"evidence\": \"Reporter assays and western blotting for cell cycle proteins in neuroblastoma cells\",\n      \"pmids\": [\"19147277\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct enzymatic mechanism defined\", \"Histone acetyltransferase association indirect\", \"Single cell line context\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identification of vimentin and E2F1 as direct TRIM16 binding partners, and demonstration of retinoid-induced nuclear translocation, established TRIM16 as a dual-compartment regulator of migration and replication.\",\n      \"evidence\": \"Co-immunoprecipitation, subcellular fractionation, and siRNA rescue in neuroblastoma and SCC cells\",\n      \"pmids\": [\"20729920\", \"22009481\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of vimentin/E2F1 downregulation unknown (degradation vs. transcriptional)\", \"Nuclear translocation signal uncharacterized\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Structural and biochemical demonstration that TRIM16 possesses E3 ubiquitin ligase activity through its B-box domains (not a classical RING) resolved the fundamental question of how an atypical TRIM protein catalyzes ubiquitination.\",\n      \"evidence\": \"3D structural modelling, in vitro and in vivo ubiquitination assays, domain deletion mutants, Co-IP for TRIM24/PML/MID1 heterodimerization\",\n      \"pmids\": [\"22402\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No crystal structure obtained\", \"Physiological substrates not yet linked to this ligase activity\", \"E2 partner preference undefined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Characterization of cell-cycle-dependent nuclear-cytoplasmic shuttling of TRIM16 and its interaction with caspase-2 expanded the functional model to include G1/S checkpoint control and apoptosis induction.\",\n      \"evidence\": \"Cell cycle synchronization with domain deletion mutants, caspase-2 Co-IP and activity assays in neuroblastoma/breast cancer cells\",\n      \"pmids\": [\"23422002\", \"23404198\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Nuclear localization signal within TRIM16 not mapped\", \"Direct caspase-2 activation mechanism unclear\", \"Caspase-2 interaction not confirmed by independent group\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"ChIP evidence that TRIM16 directly binds the IFNβ1 promoter and controls migration/proliferation in an IFNβ1-dependent manner revealed a direct transcriptional regulatory function beyond ubiquitin ligase activity.\",\n      \"evidence\": \"Chromatin immunoprecipitation, epistasis with IFNβ1 knockdown in melanoma cells\",\n      \"pmids\": [\"25333256\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of transcriptional activation at the promoter not defined\", \"Whether TRIM16 acts as a transcription factor or co-factor unclear\", \"Single cancer type tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"The pivotal discovery that TRIM16 stabilizes NRF2 via K63-linked ubiquitination within the p62-KEAP1-NRF2 complex and scaffolds autophagy machinery (p62, ULK1, ATG16L1, LC3B) onto aggregates unified TRIM16's ligase and scaffolding functions into a coherent aggrephagy pathway.\",\n      \"evidence\": \"Co-IP, ubiquitination assays with linkage specificity, autophagy flux analysis, in vivo stress models\",\n      \"pmids\": [\"30143514\", \"30806139\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of scaffold assembly unknown\", \"Whether TRIM16 ubiquitinates autophagy adaptors directly or only NRF2 unclear\", \"Relative contribution of ligase vs. scaffold function not dissected\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstration that TRIM16 ubiquitinates vimentin for proteasomal degradation — and that lncRNA VAL competitively blocks this interaction — provided the first defined ubiquitination substrate linking TRIM16 ligase activity to EMT suppression.\",\n      \"evidence\": \"Ubiquitination assay, RNA pulldown, competitive binding experiments in hepatocellular carcinoma\",\n      \"pmids\": [\"33046716\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitin chain linkage type on vimentin not specified\", \"Whether other lncRNAs similarly regulate TRIM16 substrate access unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Expansion of the substrate repertoire to Snail (K48-linked degradation suppressing EMT), NLRP3 (K48-linked degradation suppressing inflammasome), and damaged lysosomes (galectin-3-dependent lysophagy) established TRIM16 as a multi-substrate ligase with context-dependent anti-inflammatory and proteostatic roles.\",\n      \"evidence\": \"Co-IP and ubiquitination assays with epistasis rescue for Snail/NLRP3; galectin-3 puncta and senescence assays in COPD tissues and iPSC neurons\",\n      \"pmids\": [\"34265287\", \"36208489\", \"34135057\", \"37357416\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How TRIM16 selects among diverse substrates is unknown\", \"Lysophagy mechanism details (galectin-3–TRIM16 structural interface) not resolved\", \"NLRP3 finding from single lab\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identification of Src kinase as a TRIM16 substrate (ubiquitination and degradation) in cardiac hypertrophy, and of TRAF2/NFKBIZ as substrates suppressing NF-κB signaling, broadened the functional scope to cardioprotection and inflammatory homeostasis.\",\n      \"evidence\": \"Unbiased interactome followed by Co-IP and ubiquitination assays; cardiac-specific knockout mice (Src); DSS colitis model (TRAF2); HCC cells (NFKBIZ)\",\n      \"pmids\": [\"35437018\", \"41134044\", \"38581570\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Src ubiquitination uses K48 or K63 linkage not specified\", \"TRAF2 ubiquitin chain type not defined\", \"Cardiac-specific vs. systemic functions not fully delineated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Site-specific mapping of TRIM16-mediated K63-linked ubiquitination of DAB2 at K656 via the SPRY domain, promoting integrin β1 endocytosis, demonstrated a non-degradative signaling role and identified the SPRY domain as a substrate-recognition module.\",\n      \"evidence\": \"IP-MS, Co-IP, site-mapping ubiquitination assay, smooth muscle-specific TRIM16 knockout mice in CKD models\",\n      \"pmids\": [\"40575853\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SPRY domain mediates recognition of other substrates not tested\", \"Pro-calcification role contrasts with generally protective functions — context-dependency not resolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Recent studies identified additional substrates (FGF7, OPTN, YAP1, GRP78) and a secretory autophagy function, revealing that TRIM16 regulates mitophagy suppression (via OPTN degradation), integrated stress response activation (via GRP78 K63-ubiquitination/PERK release), ferroptosis modulation (via Snail K48-ubiquitination at K146), and unconventional IL-6 secretion from cancer-associated fibroblasts.\",\n      \"evidence\": \"Co-IP, linkage- and site-specific ubiquitination assays, LC3B proteomics, cardiac overexpression models, GBM xenografts, CAF imaging\",\n      \"pmids\": [\"40491313\", \"40990506\", \"40796898\", \"41437125\", \"40383937\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Secretory autophagy mechanism and cargo selection not fully defined\", \"GRP78 ubiquitination as PERK activator requires independent validation\", \"How TRIM16 simultaneously promotes lysophagy/aggrephagy yet suppresses mitophagy is paradoxical and unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis for TRIM16's substrate selectivity among its many targets, the E2 ubiquitin-conjugating enzyme partners, the mechanism distinguishing its K48 vs. K63 linkage specificity, and how its ligase-dependent vs. scaffold-dependent functions are regulated remain open questions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No crystal or cryo-EM structure of TRIM16\", \"E2 conjugating enzyme specificity undefined\", \"Mechanism governing K48 vs. K63 linkage choice unknown\", \"Relative in vivo contribution of ligase vs. scaffold function not genetically dissected\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 7, 8, 10, 11, 13, 14, 19, 25, 28, 30, 31]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [2, 6]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [7, 8, 29]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 32]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 3, 4]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [22]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [7, 8, 20, 21, 22]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 10, 11, 13, 14, 19, 25, 28, 30, 31]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [7, 8, 17, 24]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [13, 18, 21]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"complexes\": [\n      \"p62-KEAP1-NRF2 complex\"\n    ],\n    \"partners\": [\n      \"SQSTM1\",\n      \"NRF2\",\n      \"ULK1\",\n      \"LGALS3\",\n      \"VIM\",\n      \"TRIM24\",\n      \"SNAI1\",\n      \"DAB2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}