{"gene":"TRIM3","run_date":"2026-06-10T10:51:56","timeline":{"discoveries":[{"year":2005,"finding":"TRIM3 (BERP) is a subunit of the CART (cytoskeleton-associated recycling or transport) complex containing Hrs/actinin-4/BERP/myosin V, which assembles in a linear manner and is required for efficient transferrin receptor recycling to the plasma membrane but not for EGFR degradation. Disrupting any binding interaction within the complex inhibits recycling rate and shunts receptors to a slower recycling endosome pathway.","method":"Co-immunoprecipitation, dominant-negative disruption of complex assembly, transferrin recycling assay, EGFR degradation assay","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, linear assembly demonstrated by disruption of individual interactions, functional recycling assay with specific phenotypic readout, replicated across multiple complex members","pmids":["15772161"],"is_preprint":false},{"year":2000,"finding":"TRIM3 (BERP) binds alpha-actinin-4 via its RBCC domain (N-terminus). Alpha-actinin-4 can be co-immunoprecipitated with BERP from HEK293 cells, and the two proteins co-localize in the cytoplasm of differentiated PC12 cells.","method":"Yeast two-hybrid screen with RBCC domain as bait, co-immunoprecipitation from transfected HEK293 cells, immunohistochemistry co-localization","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid plus reciprocal Co-IP, single lab, two orthogonal methods but no functional consequence established","pmids":["10673389"],"is_preprint":false},{"year":2010,"finding":"TRIM3 functions as an E3 ubiquitin ligase for the postsynaptic density scaffold protein GKAP/SAPAP1. TRIM3 is present in PSD fractions from rat brain, stimulates ubiquitination and proteasome-dependent degradation of GKAP, induces loss of GKAP and Shank1 from postsynaptic sites, and RNAi knockdown of TRIM3 increases GKAP/Shank1 at synapses and enlarges dendritic spine heads. TRIM3 RNAi also prevented activity-dependent GKAP loss.","method":"Co-immunoprecipitation, ubiquitination assay, proteasome inhibitor rescue, RNAi knockdown in rat hippocampal neurons, immunofluorescence quantification of spine morphology","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP, ubiquitination assay, RNAi with functional readout, activity-dependent rescue), single lab but comprehensive mechanistic characterization","pmids":["20352094"],"is_preprint":false},{"year":2010,"finding":"TRIM3 (BERP) expression is upregulated in a p53-dependent manner. BERP-deficient mice show increased resistance to pentylenetetrazol-induced seizures, decreased amplitude of GABA-A receptor-mediated miniature inhibitory postsynaptic currents, and reduced surface expression of GABA-A receptors containing the gamma2-subunit, suggesting BERP regulates intracellular trafficking of GABA-A receptors at a posttranscriptional level.","method":"Gene targeting (knockout mice), electrophysiology (mIPSC recording), surface protein expression by biochemical fractionation, p53-dependent transcriptional regulation assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with defined electrophysiological and biochemical phenotype, p53-dependent regulation established, multiple orthogonal readouts","pmids":["20543135"],"is_preprint":false},{"year":2013,"finding":"TRIM3 interacts with KIF21B (a neuronal kinesin enriched in dendrites) via its RBCC domain. TRIM3 is found at intracellular and Golgi-derived vesicles and co-localizes with KIF21B in neurons. TRIM3 depletion reduces KIF21B motor motility, while its E3 ligase function is not involved in KIF21B degradation.","method":"Co-immunoprecipitation, Trim3 gene deletion in mice, TRIM3 overexpression in cultured neurons, co-localization imaging, motility assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, knockout and overexpression with functional motility readout, single lab, two orthogonal approaches","pmids":["24086586"],"is_preprint":false},{"year":2013,"finding":"TRIM3 can bind to the CDK inhibitor p21(WAF1/CIP1). Reducing TRIM3 expression accelerated platelet-derived growth factor-induced glioma development in mice, consistent with a tumor suppressor role. TRIM3 binding to p21 may sequester p21 and prevent it from facilitating cyclin D1-CDK4 accumulation.","method":"Co-immunoprecipitation (TRIM3-p21 binding), mouse glioma model with reduced TRIM3 expression","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP binding plus in vivo mouse model, single lab, mechanistic pathway placement partially inferred","pmids":["23318451"],"is_preprint":false},{"year":2014,"finding":"TRIM3 suppresses c-Myc expression and activity in human glioma cell lines and attenuates stem-like properties of primary GBM cultures (neurosphere formation, CD133/Nestin/Nanog expression). TRIM3 expression increases the proportion of glioblastoma stem cells dividing asymmetrically rather than symmetrically, functioning as a human ortholog of Drosophila Brat.","method":"TRIM3 reconstitution in GBM cell lines and neurospheres, neurosphere formation assay, flow cytometry for stem markers, asymmetric division quantification, in vivo xenograft","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function and gain-of-function with defined cellular phenotype, single lab, multiple readouts but no direct biochemical mechanism for Myc suppression shown","pmids":["24947043"],"is_preprint":false},{"year":2014,"finding":"The RING domain E3 ligase activity of TRIM3 is required for its growth-suppressive function. In a reconstituted in vitro ubiquitination system, TRIM3 promotes ubiquitination of p21 with UbcH5a as the preferred E2 enzyme. RING domain mutations abolish both E3 ligase activity and growth suppression.","method":"In vitro ubiquitination reconstitution with UbcH5a as E2, RING domain mutagenesis, cell proliferation assay","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of ubiquitination with mutagenesis, single lab but direct biochemical demonstration","pmids":["24393003"],"is_preprint":false},{"year":2015,"finding":"TRIM3 E3 ubiquitin ligase regulates synaptic γ-actin levels by polyubiquitylating γ-actin, most likely cotranslationally at synaptic sites. TRIM3 protein and Actg1 transcript co-localize in messenger ribonucleoprotein (mRNP) granules responsible for dendritic mRNA targeting. Trim3(-/-) mice have increased γ-actin at hippocampal synapses, higher spine densities, increased long-term potentiation, and enhanced short-term contextual fear memory.","method":"Trim3 knockout mice, co-localization of TRIM3 protein and Actg1 mRNA in mRNP granules, in vitro ubiquitination of γ-actin, spine density quantification, LTP electrophysiology, fear conditioning behavioral assay","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — knockout mouse with multiple orthogonal readouts (biochemical, electrophysiological, behavioral), in vitro ubiquitination, mRNP co-localization, single lab but rigorous multi-method study","pmids":["26527743"],"is_preprint":false},{"year":2016,"finding":"TRIM3 (human ortholog of Drosophila Brat) suppresses nuclear transport of active NOTCH1 intracellular domain (NICD) in glioblastoma by directly binding to the Importin complex. This attenuates Notch signaling and the stem cell component, maintaining stem cell equilibrium.","method":"Co-immunoprecipitation of TRIM3 with Importin complex, NICD nuclear transport assay, TRIM3 knockdown/overexpression in GBM cells, Drosophila brat-RNAi brain tumor model","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with Importin, nuclear transport assay, supported by parallel Drosophila brat genetic model, single lab","pmids":["26893479"],"is_preprint":false},{"year":2020,"finding":"TRIM3 mediates K63-linked polyubiquitination of TLR3 at K831, promoting TLR3 trafficking from the Golgi apparatus to endolysosomes via ESCRT complexes, which is required for dsRNA sensing and antiviral innate immune response. TRIM3 is mainly localized in the Golgi apparatus and translocates to early endosomes upon poly(I:C) stimulation. TRIM3 deficiency impairs TLR3 trafficking and reduces antiviral gene expression.","method":"Co-immunoprecipitation, ubiquitination assay with K63 linkage-specific analysis, site-directed mutagenesis (K831), subcellular fractionation, confocal localization, Trim3 knockout cells and mice, poly(I:C) stimulation assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — reconstituted ubiquitination, site-specific mutagenesis, knockout validation in cells and in vivo, multiple orthogonal methods, single lab but comprehensive","pmids":["32878999"],"is_preprint":false},{"year":2023,"finding":"TRIM3 directly interacts with SLC7A11/xCT through its NHL domain and promotes K11-linked ubiquitination of SLC7A11 at K37, leading to proteasome-mediated degradation of SLC7A11. This reduces cystine import, increases ROS and lipid peroxidation, and promotes ferroptosis in non-small cell lung cancer cells.","method":"Co-immunoprecipitation, ubiquitination assay with K11 linkage-specific analysis, NHL domain deletion analysis, site-directed mutagenesis (K37), proteasome inhibitor rescue, ROS/lipid peroxidation measurement, in vivo xenograft","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — domain-specific interaction mapping, site-specific ubiquitination with mutagenesis, proteasome rescue, in vivo validation, single lab but multiple orthogonal methods","pmids":["37978273"],"is_preprint":false},{"year":2018,"finding":"TRIM3 directly interacts with and induces E3 ligase-dependent proteasomal turnover of importin α3 and α-Actinin-4 (ACTN4), controlling NF-κB activity. TRIM3 downregulation leads to constitutive NF-κB activation through disruption of the NF-κB–IκB-α negative feedback loop and enhanced p65 DNA-binding via symmetrical dimethylarginine modification of NF-κB/p65 at Arg30 and Arg35.","method":"Co-immunoprecipitation, ubiquitination assay, proteasomal degradation assay, NF-κB reporter assay, NF-κB/p65 methylation analysis, in vitro and in vivo metastasis assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ubiquitination assay, NF-κB pathway functional readout, single lab, multiple orthogonal methods","pmids":["30542119"],"is_preprint":false},{"year":2020,"finding":"TRIM3 interacts with IRF3 and inhibits its phosphorylation, thereby suppressing the IRF3 signaling pathway and NLRP3 inflammasome activation in LPS-treated renal tubular cells.","method":"Co-immunoprecipitation, Western blot for IRF3 phosphorylation, TRIM3 overexpression/knockdown in HK-2 cells and LPS-treated rat model","journal":"International urology and nephrology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP with phosphorylation readout, single lab, no direct ubiquitination or in vitro mechanistic assay","pmids":["34643859"],"is_preprint":false},{"year":2019,"finding":"TRIM3 directly interacts with Beclin1 and promotes its K48-linked polyubiquitination, leading to Beclin1 degradation and consequent inhibition of autophagy in Ewing sarcoma cells.","method":"Co-immunoprecipitation, ubiquitination assay with K48 linkage-specific analysis, Western blot, immunofluorescence for autophagy markers","journal":"OncoTargets and therapy","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP plus K48-specific ubiquitination assay, single lab, limited functional validation beyond protein levels","pmids":["32021240"],"is_preprint":false},{"year":2020,"finding":"TRIM3 associates with p53 and promotes p53 K48-linked ubiquitination and degradation. TRIM3 depletion in breast cancer cells increases p53 protein levels, inhibits cell proliferation, and promotes apoptosis.","method":"Co-immunoprecipitation, K48-specific ubiquitination assay, protein stability assay, Western blot, TRIM3 knockdown with apoptosis readout","journal":"Cancer cell international","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP plus K48-specific ubiquitination, single lab, contradicts PMID:26691157 which reports TRIM3 stabilizes p53","pmids":["33292295"],"is_preprint":false},{"year":2021,"finding":"TRIM3 acts as a SUMO E3 ligase by binding UBC9 and promoting SUMOylation of estrogen receptor alpha (ESR1/ERα), thereby activating the ER signaling pathway and conferring tamoxifen resistance. Silencing UBC9 abolishes TRIM3's effect on tamoxifen resistance.","method":"Co-immunoprecipitation of TRIM3-UBC9, SUMOylation assay for ERα, TRIM3 knockdown/overexpression with ERα pathway reporter, cell viability assay","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, SUMOylation assay, epistasis via UBC9 silencing, single lab, two orthogonal methods","pmids":["34508066"],"is_preprint":false},{"year":2022,"finding":"TRIM3 associates with ERα and promotes its stability via K63-linked polyubiquitination, thereby enhancing estrogen signaling and breast cancer cell proliferation and migration on a genome-wide scale.","method":"Co-immunoprecipitation, K63-specific ubiquitination assay, protein stability assay, RNA sequencing, luciferase reporter for ERα activity, TRIM3 depletion with proliferation/migration readout","journal":"Cell communication and signaling : CCS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, K63-specific ubiquitination, RNA-seq, single lab, multiple methods; note conflicting data with PMID:33292295 on p53 direction","pmids":["35392925"],"is_preprint":false},{"year":2022,"finding":"The isolated RING domain of human TRIM3 is monomeric and inactive as an E3 ligase due to placental mammal-specific amino acid changes adjacent to the core RING domain that prevent self-association but not E2 recognition. TRIM3 RING activity can be restored by substitution with the corresponding TRIM2 region or by heterodimerization with TRIM2. TRIM2 and TRIM3 interact in cells via their filamin and coiled-coil domains, respectively.","method":"Structural analysis of RING domain, in vitro ubiquitination assays, RING domain mutagenesis, co-immunoprecipitation of TRIM2-TRIM3 heterodimerization, biochemical dimerization analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with mutagenesis, structural domain mapping, heterodimerization Co-IP, multiple orthogonal methods in single rigorous study","pmids":["36481767"],"is_preprint":false},{"year":2024,"finding":"TRIM3 binds to microtubules via its C-terminal NHL-repeat region. TRIM3 is required for accumulation of acetylated tubulin following taxol treatment, and TRIM3 loss partially recapitulates the reduction in nocodazole-resistant microtubules seen with ATAT1 depletion. Loss of TRIM3 decreases ATAT1 protein levels independently of transcription.","method":"Differential extraction proteomics, nocodazole/taxol drug sensitivity assay quantitated by mass spectrometry, TRIM3 deletion mapping to NHL repeats, ATAT1 protein quantification after TRIM3 depletion, transcription-independent protein level analysis","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical microtubule association assay, domain mapping, functional consequences of depletion, single lab, novel finding","pmids":["38149663"],"is_preprint":false},{"year":2023,"finding":"TRIM3 directly interacts with FABP4 and decreases FABP4 protein levels through ubiquitination-mediated degradation. TRIM3-mediated FABP4 degradation suppresses colorectal cancer cell migration, invasion, and lipid droplet formation. Overexpressed FABP4 reverses the effect of TRIM3 upregulation.","method":"Co-immunoprecipitation, ubiquitination assay, TRIM3/FABP4 overexpression and knockdown, migration/invasion assays, lipid droplet quantification, in vivo liver metastasis model","journal":"Histology and histopathology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP, ubiquitination assay, epistasis rescue experiment, single lab","pmids":["37212515"],"is_preprint":false},{"year":2023,"finding":"TRIM3 directly interacts with the C-terminus of p53 (residues 320–393) and retains p53 in the cytoplasm to decrease its nuclear expression. In wild-type p53 CRC cells, cytoplasmic retention reduces p53 tumor-suppressive nuclear activity. In mutant p53 CRC cells, TRIM3 degrades nuclear mutant p53, reversing oxaliplatin chemotherapy resistance by downregulating multidrug resistance genes.","method":"Co-immunoprecipitation with p53 domain mapping, subcellular fractionation, immunostaining for p53 localization, TRIM3 overexpression/knockdown, drug resistance assays","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-specific Co-IP, subcellular localization, functional drug resistance readout, single lab","pmids":["36894560"],"is_preprint":false},{"year":2025,"finding":"TRIM3 promotes K48-linked ubiquitination and degradation of GRP78, a key ER stress protein. TRIM3 directly interacts with GRP78, and its overexpression in cisplatin-resistant cervical cancer cells suppresses drug resistance by promoting PERK activation and apoptosis downstream of GRP78 inhibition.","method":"Co-immunoprecipitation, ubiquitination assay, TRIM3 overexpression with GRP78 rescue, apoptosis assay, drug resistance assay","journal":"Biochemistry and cell biology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — Co-IP and ubiquitination assay, single lab, single paper, no in vitro reconstitution","pmids":["39620445"],"is_preprint":false},{"year":2025,"finding":"TRIM3 directly interacts with YAP1 and reduces YAP1 protein stability through ubiquitination, without affecting YAP1 mRNA levels. TRIM3 depletion increases YAP1 levels and promotes proliferation and mobility of melanoma cells; knockdown of YAP1 rescues the pro-tumorigenic effects of TRIM3 depletion.","method":"Co-immunoprecipitation, ubiquitination assay, TRIM3/YAP1 overexpression/knockdown, rescue assay, qPCR for mRNA levels","journal":"Scientific reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP and ubiquitination assay, single lab, no in vitro reconstitution","pmids":["40715334"],"is_preprint":false},{"year":2026,"finding":"TRIM3 interacts with TLR3 and promotes its K48-linked ubiquitination and degradation. Activation of the TRIM3/TLR3 axis induces IFN-β secretion and overrides feedback inhibition of IFN-β. Conversely, excess IFN-β inhibits TRIM3 expression, creating a reciprocal negative feedback loop. This mechanism suppresses NSCLC progression and reprograms the tumor microenvironment.","method":"Co-immunoprecipitation, Western blot for K48-linked ubiquitination, TLR3 protein stability assay, TRIM3 overexpression/knockdown, IFN-β ELISA, CD8+ T cell co-culture cytotoxicity assay, in vivo xenograft","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, K48-linked ubiquitination of TLR3 (consistent with PMID:32878999 for K63), feedback loop established by reciprocal expression analysis, single lab","pmids":["41545343"],"is_preprint":false}],"current_model":"TRIM3 is a RING-type E3 ubiquitin ligase whose isolated RING domain is monomeric and inactive in placental mammals but can be activated by heterodimerization with TRIM2; it ubiquitinates multiple substrates—including GKAP/SAPAP1 (postsynaptic degradation), γ-actin (synaptic actin turnover), SLC7A11/xCT (K11-linked, promoting ferroptosis), TLR3 (K63-linked, promoting endolysosomal trafficking for antiviral signaling or K48-linked, promoting its degradation in cytokine modulation), p21, p53, ERα, GRP78, FABP4, Beclin1, importin α3, and ACTN4—thereby regulating dendritic spine morphology and hippocampal plasticity, asymmetric cell division via suppression of c-Myc and Notch/NICD nuclear transport through Importin binding, innate immune signaling, and tumor suppression across multiple cancer types; additionally, TRIM3 binds microtubules via its NHL domain and modulates acetylated tubulin levels by controlling ATAT1 abundance, and interacts with KIF21B kinesin to regulate dendritic motor motility."},"narrative":{"mechanistic_narrative":"TRIM3 (BERP) is a RING-type, microtubule- and vesicle-associated TRIM-family E3 ubiquitin ligase that couples substrate ubiquitination to the control of synaptic architecture, membrane trafficking, innate immune signaling, and tumor suppression [PMID:24393003, PMID:26527743, PMID:32878999]. Its catalytic output depends on the RING domain, which in placental mammals is monomeric and inactive in isolation and is activated by heterodimerization with TRIM2 through their coiled-coil and filamin domains [PMID:36481767]; reconstituted ligase activity uses UbcH5a as the preferred E2 [PMID:24393003]. In neurons, TRIM3 ubiquitinates the postsynaptic scaffold GKAP/SAPAP1 to drive its proteasomal turnover and restrict dendritic spine head size [PMID:20352094], and polyubiquitinates synaptic γ-actin—likely cotranslationally at mRNP granules—so that its loss elevates spine density, long-term potentiation, and contextual fear memory [PMID:26527743]; it also assembles into a cytoskeletal recycling (CART) complex with Hrs/actinin-4/myosin V required for transferrin receptor recycling [PMID:15772161] and binds the kinesin KIF21B to support dendritic motor motility independently of ligase activity [PMID:24086586]. TRIM3 binds microtubules via its C-terminal NHL repeats and sustains acetylated tubulin levels by maintaining ATAT1 protein abundance [PMID:38149663]. In innate immunity it controls TLR3: K63-linked ubiquitination at K831 directs TLR3 trafficking from Golgi to endolysosomes for dsRNA sensing [PMID:32878999], while a distinct K48-linked modification promotes TLR3 turnover within an IFN-β feedback loop [PMID:41545343]. As a tumor suppressor across glioma, lung, breast, colorectal and other cancers, TRIM3 restrains proliferation by ubiquitinating p21 [PMID:24393003], suppresses glioblastoma stemness by limiting c-Myc and blocking Importin-dependent nuclear transport of the NOTCH1 intracellular domain [PMID:24947043, PMID:26893479], and promotes ferroptosis through K11-linked ubiquitination of SLC7A11/xCT at K37 via its NHL domain [PMID:37978273]. Additional reported substrates and partners include p53, ERα, GRP78, FABP4, Beclin1, importin α3/ACTN4 and YAP1, with conflicting reports on the direction of p53 regulation [PMID:33292295, PMID:34508066, PMID:35392925, PMID:36894560].","teleology":[{"year":2000,"claim":"Established the first physical partner of TRIM3, defining its N-terminal RBCC domain as a protein-interaction module that engages the actin-crosslinker α-actinin-4.","evidence":"Yeast two-hybrid with RBCC bait plus reciprocal Co-IP and co-localization in PC12 cells","pmids":["10673389"],"confidence":"Medium","gaps":["No functional consequence of the interaction established","Ubiquitination of α-actinin-4 not tested at this stage"]},{"year":2005,"claim":"Placed TRIM3 in a defined cytoskeletal trafficking machine, showing it is a structural subunit of the CART complex required for receptor recycling rather than degradation.","evidence":"Reciprocal Co-IP, dominant-negative disruption of linear complex assembly, transferrin recycling and EGFR degradation assays","pmids":["15772161"],"confidence":"High","gaps":["Role of TRIM3 catalytic activity within the complex not addressed","Whether complex assembly involves ubiquitination unknown"]},{"year":2010,"claim":"Identified TRIM3 as a functional E3 ligase in the brain that degrades a postsynaptic scaffold and shapes spine morphology, linking ubiquitination to synaptic remodeling.","evidence":"Co-IP, ubiquitination assay with proteasome rescue, RNAi in rat hippocampal neurons with spine morphology readout; separately, knockout mice with GABA-A trafficking/electrophysiology phenotype and p53-dependent expression","pmids":["20352094","20543135"],"confidence":"High","gaps":["Direct ubiquitination site on GKAP not mapped","Mechanism linking p53 to TRIM3 transcription not detailed"]},{"year":2013,"claim":"Extended TRIM3 function into cell-cycle control and motor transport, showing a ligase-dependent tumor-suppressive role via p21 and a ligase-independent role in kinesin motility.","evidence":"Co-IP of TRIM3 with p21 and with KIF21B, mouse glioma model, neuronal motility assays","pmids":["23318451","24086586"],"confidence":"Medium","gaps":["Whether p21 is ubiquitinated or merely sequestered not resolved here","Mechanism by which TRIM3 drives KIF21B motility unknown"]},{"year":2014,"claim":"Demonstrated that RING-dependent ligase activity is necessary for growth suppression and that TRIM3 restrains glioblastoma stemness as a human Brat ortholog.","evidence":"In vitro ubiquitination reconstitution of p21 with UbcH5a and RING mutagenesis; GBM reconstitution with stem-marker, neurosphere, and asymmetric-division readouts plus xenograft","pmids":["24393003","24947043"],"confidence":"High","gaps":["Direct biochemical mechanism of c-Myc suppression not shown","Link between p21 ubiquitination and asymmetric division not established"]},{"year":2015,"claim":"Resolved how TRIM3 controls structural plasticity, showing it ubiquitinates γ-actin cotranslationally at synaptic mRNP granules to limit spine density, LTP, and memory.","evidence":"Trim3 knockout mice, in vitro γ-actin ubiquitination, TRIM3/Actg1 mRNP co-localization, spine, LTP, and fear-conditioning assays","pmids":["26527743"],"confidence":"High","gaps":["Cotranslational ubiquitination mechanism inferred rather than directly imaged","Coupling to GKAP pathway not integrated"]},{"year":2016,"claim":"Defined a non-degradative tumor-suppressive mechanism whereby TRIM3 blocks Notch signaling by binding the Importin complex to prevent NICD nuclear entry.","evidence":"Co-IP of TRIM3 with Importin, NICD nuclear transport assay in GBM cells, Drosophila brat-RNAi tumor model","pmids":["26893479"],"confidence":"Medium","gaps":["Whether Importin binding requires ubiquitination not tested","Direct NICD-TRIM3 interaction not demonstrated"]},{"year":2018,"claim":"Connected TRIM3 to NF-κB regulation through ligase-dependent turnover of importin α3 and ACTN4, positioning it as a metastasis suppressor.","evidence":"Co-IP, ubiquitination and proteasomal degradation assays, NF-κB reporter and p65 methylation analysis, in vivo metastasis assays","pmids":["30542119"],"confidence":"Medium","gaps":["Ubiquitin linkage type not specified","Direct cause-effect between substrate degradation and p65 methylation incomplete"]},{"year":2020,"claim":"Established a substrate-specific trafficking mechanism in innate immunity: K63-linked ubiquitination of TLR3 at K831 routes it from Golgi to endolysosomes for dsRNA sensing.","evidence":"Reconstituted K63-specific ubiquitination, K831 mutagenesis, subcellular fractionation/confocal localization, Trim3 knockout cells and mice, poly(I:C) stimulation; separate Low-confidence IRF3 phosphorylation report","pmids":["32878999","34643859"],"confidence":"High","gaps":["IRF3 interaction (Low confidence) lacks ubiquitination or reconstitution evidence","How TRIM3 selects K63 versus K48 on TLR3 unresolved"]},{"year":2022,"claim":"Explained the catalytic basis of TRIM3 regulation, revealing its RING is autoinhibited in placental mammals and activated by TRIM2 heterodimerization.","evidence":"RING structural analysis, in vitro ubiquitination with mutagenesis, TRIM2-TRIM3 heterodimerization Co-IP and domain mapping","pmids":["36481767"],"confidence":"High","gaps":["Which physiological substrates require TRIM2 partnering not delineated","Whether all reported substrates depend on heterodimer activation untested"]},{"year":2023,"claim":"Diversified TRIM3 ubiquitin-linkage output and substrate range, including K11-linked degradation of SLC7A11 promoting ferroptosis and degradation of FABP4 suppressing lipid-driven metastasis.","evidence":"NHL-domain mapping, K11- and K48-linkage-specific ubiquitination, site mutagenesis (K37), proteasome rescue, ROS/lipid and migration assays, xenografts; plus cytoplasmic-retention control of p53 with domain mapping","pmids":["37978273","37212515","36894560"],"confidence":"Medium","gaps":["NHL domain used for both microtubule and SLC7A11 binding; selectivity unexplained","Direction of p53 regulation conflicts with other reports"]},{"year":2024,"claim":"Defined a ubiquitination-independent cytoskeletal function: TRIM3 binds microtubules via NHL repeats and sustains acetylated tubulin by maintaining ATAT1 protein levels.","evidence":"Differential extraction proteomics, nocodazole/taxol drug-sensitivity mass spectrometry, NHL deletion mapping, ATAT1 protein quantification independent of transcription","pmids":["38149663"],"confidence":"Medium","gaps":["Whether ATAT1 is a direct TRIM3 substrate not shown","Mechanism stabilizing ATAT1 unknown"]},{"year":2026,"claim":"Revealed a second mode of TLR3 control, where K48-linked degradation of TLR3 operates within a reciprocal IFN-β negative-feedback loop suppressing lung cancer.","evidence":"Co-IP, K48-linked ubiquitination and TLR3 stability assays, IFN-β ELISA, CD8+ T cell cytotoxicity co-culture, xenograft","pmids":["41545343"],"confidence":"Medium","gaps":["Reconciliation with K63-linked stabilizing modification of TLR3 not mechanistically resolved","Signal determining linkage choice unknown"]},{"year":null,"claim":"How TRIM3 selects among diverse substrates and ubiquitin-linkage types, and which functions require TRIM2 heterodimer activation versus ligase-independent scaffolding, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of substrate engagement by the NHL domain","Conflicting reports on p53 regulation direction unreconciled","Determinants of K11 vs K48 vs K63 linkage selection unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[2,7,10,11]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[2,7,8,10,11,18]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,1,4,19]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,9]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[4,10]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[4,10]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1,2]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[19]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[10]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[2,7,10,11]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[10,24]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[2,8]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[11]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[0,10,21]}],"complexes":["CART complex (Hrs/actinin-4/BERP/myosin V)","TRIM2-TRIM3 heterodimer"],"partners":["TRIM2","ACTN4","KIF21B","GKAP/SAPAP1","TLR3","SLC7A11","IMPORTIN Α3","ESR1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O75382","full_name":"Tripartite motif-containing protein 3","aliases":["Brain-expressed RING finger protein","RING finger protein 22","RING finger protein 97"],"length_aa":744,"mass_kda":80.8,"function":"E3 ubiquitin ligase that plays essential roles in neuronal functions such as regulation of neuronal plasticity, learning, and memory (By similarity). In addition to its neuronal functions, participates in other biological processes such as innate immunity or cell cycle regulation. Component of the cytoskeleton-associated recycling or transport complex in neurons, polyubiquitinates gamma-actin, thus regulating neuronal plasticity, learning, and memory (By similarity). Ubiquitinates postsynaptic scaffold GKAP, a neuronal substrate involved in synaptic remodeling and thereby modulates dendritic spine morphology (By similarity). Positively regulates motility of microtubule-dependent motor protein KIF21B (By similarity). Induces growth arrest via its RING-dependent E3 ligase activity and ubiquitinates CDKN1A (PubMed:24393003). Positively regulates TLR3-mediated signaling by mediating 'Lys-63'-linked polyubiquitination of TLR3 (PubMed:32878999). 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oncology","url":"https://pubmed.ncbi.nlm.nih.gov/41870861","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":47969,"output_tokens":6822,"usd":0.123119,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":15906,"output_tokens":5228,"usd":0.105115,"stage2_stop_reason":"end_turn"},"total_usd":0.228234,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2005,\n      \"finding\": \"TRIM3 (BERP) is a subunit of the CART (cytoskeleton-associated recycling or transport) complex containing Hrs/actinin-4/BERP/myosin V, which assembles in a linear manner and is required for efficient transferrin receptor recycling to the plasma membrane but not for EGFR degradation. Disrupting any binding interaction within the complex inhibits recycling rate and shunts receptors to a slower recycling endosome pathway.\",\n      \"method\": \"Co-immunoprecipitation, dominant-negative disruption of complex assembly, transferrin recycling assay, EGFR degradation assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, linear assembly demonstrated by disruption of individual interactions, functional recycling assay with specific phenotypic readout, replicated across multiple complex members\",\n      \"pmids\": [\"15772161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"TRIM3 (BERP) binds alpha-actinin-4 via its RBCC domain (N-terminus). Alpha-actinin-4 can be co-immunoprecipitated with BERP from HEK293 cells, and the two proteins co-localize in the cytoplasm of differentiated PC12 cells.\",\n      \"method\": \"Yeast two-hybrid screen with RBCC domain as bait, co-immunoprecipitation from transfected HEK293 cells, immunohistochemistry co-localization\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid plus reciprocal Co-IP, single lab, two orthogonal methods but no functional consequence established\",\n      \"pmids\": [\"10673389\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TRIM3 functions as an E3 ubiquitin ligase for the postsynaptic density scaffold protein GKAP/SAPAP1. TRIM3 is present in PSD fractions from rat brain, stimulates ubiquitination and proteasome-dependent degradation of GKAP, induces loss of GKAP and Shank1 from postsynaptic sites, and RNAi knockdown of TRIM3 increases GKAP/Shank1 at synapses and enlarges dendritic spine heads. TRIM3 RNAi also prevented activity-dependent GKAP loss.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, proteasome inhibitor rescue, RNAi knockdown in rat hippocampal neurons, immunofluorescence quantification of spine morphology\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP, ubiquitination assay, RNAi with functional readout, activity-dependent rescue), single lab but comprehensive mechanistic characterization\",\n      \"pmids\": [\"20352094\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TRIM3 (BERP) expression is upregulated in a p53-dependent manner. BERP-deficient mice show increased resistance to pentylenetetrazol-induced seizures, decreased amplitude of GABA-A receptor-mediated miniature inhibitory postsynaptic currents, and reduced surface expression of GABA-A receptors containing the gamma2-subunit, suggesting BERP regulates intracellular trafficking of GABA-A receptors at a posttranscriptional level.\",\n      \"method\": \"Gene targeting (knockout mice), electrophysiology (mIPSC recording), surface protein expression by biochemical fractionation, p53-dependent transcriptional regulation assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with defined electrophysiological and biochemical phenotype, p53-dependent regulation established, multiple orthogonal readouts\",\n      \"pmids\": [\"20543135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TRIM3 interacts with KIF21B (a neuronal kinesin enriched in dendrites) via its RBCC domain. TRIM3 is found at intracellular and Golgi-derived vesicles and co-localizes with KIF21B in neurons. TRIM3 depletion reduces KIF21B motor motility, while its E3 ligase function is not involved in KIF21B degradation.\",\n      \"method\": \"Co-immunoprecipitation, Trim3 gene deletion in mice, TRIM3 overexpression in cultured neurons, co-localization imaging, motility assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, knockout and overexpression with functional motility readout, single lab, two orthogonal approaches\",\n      \"pmids\": [\"24086586\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TRIM3 can bind to the CDK inhibitor p21(WAF1/CIP1). Reducing TRIM3 expression accelerated platelet-derived growth factor-induced glioma development in mice, consistent with a tumor suppressor role. TRIM3 binding to p21 may sequester p21 and prevent it from facilitating cyclin D1-CDK4 accumulation.\",\n      \"method\": \"Co-immunoprecipitation (TRIM3-p21 binding), mouse glioma model with reduced TRIM3 expression\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP binding plus in vivo mouse model, single lab, mechanistic pathway placement partially inferred\",\n      \"pmids\": [\"23318451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TRIM3 suppresses c-Myc expression and activity in human glioma cell lines and attenuates stem-like properties of primary GBM cultures (neurosphere formation, CD133/Nestin/Nanog expression). TRIM3 expression increases the proportion of glioblastoma stem cells dividing asymmetrically rather than symmetrically, functioning as a human ortholog of Drosophila Brat.\",\n      \"method\": \"TRIM3 reconstitution in GBM cell lines and neurospheres, neurosphere formation assay, flow cytometry for stem markers, asymmetric division quantification, in vivo xenograft\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function and gain-of-function with defined cellular phenotype, single lab, multiple readouts but no direct biochemical mechanism for Myc suppression shown\",\n      \"pmids\": [\"24947043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The RING domain E3 ligase activity of TRIM3 is required for its growth-suppressive function. In a reconstituted in vitro ubiquitination system, TRIM3 promotes ubiquitination of p21 with UbcH5a as the preferred E2 enzyme. RING domain mutations abolish both E3 ligase activity and growth suppression.\",\n      \"method\": \"In vitro ubiquitination reconstitution with UbcH5a as E2, RING domain mutagenesis, cell proliferation assay\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of ubiquitination with mutagenesis, single lab but direct biochemical demonstration\",\n      \"pmids\": [\"24393003\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TRIM3 E3 ubiquitin ligase regulates synaptic γ-actin levels by polyubiquitylating γ-actin, most likely cotranslationally at synaptic sites. TRIM3 protein and Actg1 transcript co-localize in messenger ribonucleoprotein (mRNP) granules responsible for dendritic mRNA targeting. Trim3(-/-) mice have increased γ-actin at hippocampal synapses, higher spine densities, increased long-term potentiation, and enhanced short-term contextual fear memory.\",\n      \"method\": \"Trim3 knockout mice, co-localization of TRIM3 protein and Actg1 mRNA in mRNP granules, in vitro ubiquitination of γ-actin, spine density quantification, LTP electrophysiology, fear conditioning behavioral assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — knockout mouse with multiple orthogonal readouts (biochemical, electrophysiological, behavioral), in vitro ubiquitination, mRNP co-localization, single lab but rigorous multi-method study\",\n      \"pmids\": [\"26527743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TRIM3 (human ortholog of Drosophila Brat) suppresses nuclear transport of active NOTCH1 intracellular domain (NICD) in glioblastoma by directly binding to the Importin complex. This attenuates Notch signaling and the stem cell component, maintaining stem cell equilibrium.\",\n      \"method\": \"Co-immunoprecipitation of TRIM3 with Importin complex, NICD nuclear transport assay, TRIM3 knockdown/overexpression in GBM cells, Drosophila brat-RNAi brain tumor model\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with Importin, nuclear transport assay, supported by parallel Drosophila brat genetic model, single lab\",\n      \"pmids\": [\"26893479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRIM3 mediates K63-linked polyubiquitination of TLR3 at K831, promoting TLR3 trafficking from the Golgi apparatus to endolysosomes via ESCRT complexes, which is required for dsRNA sensing and antiviral innate immune response. TRIM3 is mainly localized in the Golgi apparatus and translocates to early endosomes upon poly(I:C) stimulation. TRIM3 deficiency impairs TLR3 trafficking and reduces antiviral gene expression.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay with K63 linkage-specific analysis, site-directed mutagenesis (K831), subcellular fractionation, confocal localization, Trim3 knockout cells and mice, poly(I:C) stimulation assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — reconstituted ubiquitination, site-specific mutagenesis, knockout validation in cells and in vivo, multiple orthogonal methods, single lab but comprehensive\",\n      \"pmids\": [\"32878999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRIM3 directly interacts with SLC7A11/xCT through its NHL domain and promotes K11-linked ubiquitination of SLC7A11 at K37, leading to proteasome-mediated degradation of SLC7A11. This reduces cystine import, increases ROS and lipid peroxidation, and promotes ferroptosis in non-small cell lung cancer cells.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay with K11 linkage-specific analysis, NHL domain deletion analysis, site-directed mutagenesis (K37), proteasome inhibitor rescue, ROS/lipid peroxidation measurement, in vivo xenograft\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — domain-specific interaction mapping, site-specific ubiquitination with mutagenesis, proteasome rescue, in vivo validation, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"37978273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TRIM3 directly interacts with and induces E3 ligase-dependent proteasomal turnover of importin α3 and α-Actinin-4 (ACTN4), controlling NF-κB activity. TRIM3 downregulation leads to constitutive NF-κB activation through disruption of the NF-κB–IκB-α negative feedback loop and enhanced p65 DNA-binding via symmetrical dimethylarginine modification of NF-κB/p65 at Arg30 and Arg35.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, proteasomal degradation assay, NF-κB reporter assay, NF-κB/p65 methylation analysis, in vitro and in vivo metastasis assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ubiquitination assay, NF-κB pathway functional readout, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"30542119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRIM3 interacts with IRF3 and inhibits its phosphorylation, thereby suppressing the IRF3 signaling pathway and NLRP3 inflammasome activation in LPS-treated renal tubular cells.\",\n      \"method\": \"Co-immunoprecipitation, Western blot for IRF3 phosphorylation, TRIM3 overexpression/knockdown in HK-2 cells and LPS-treated rat model\",\n      \"journal\": \"International urology and nephrology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP with phosphorylation readout, single lab, no direct ubiquitination or in vitro mechanistic assay\",\n      \"pmids\": [\"34643859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRIM3 directly interacts with Beclin1 and promotes its K48-linked polyubiquitination, leading to Beclin1 degradation and consequent inhibition of autophagy in Ewing sarcoma cells.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay with K48 linkage-specific analysis, Western blot, immunofluorescence for autophagy markers\",\n      \"journal\": \"OncoTargets and therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP plus K48-specific ubiquitination assay, single lab, limited functional validation beyond protein levels\",\n      \"pmids\": [\"32021240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRIM3 associates with p53 and promotes p53 K48-linked ubiquitination and degradation. TRIM3 depletion in breast cancer cells increases p53 protein levels, inhibits cell proliferation, and promotes apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, K48-specific ubiquitination assay, protein stability assay, Western blot, TRIM3 knockdown with apoptosis readout\",\n      \"journal\": \"Cancer cell international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP plus K48-specific ubiquitination, single lab, contradicts PMID:26691157 which reports TRIM3 stabilizes p53\",\n      \"pmids\": [\"33292295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRIM3 acts as a SUMO E3 ligase by binding UBC9 and promoting SUMOylation of estrogen receptor alpha (ESR1/ERα), thereby activating the ER signaling pathway and conferring tamoxifen resistance. Silencing UBC9 abolishes TRIM3's effect on tamoxifen resistance.\",\n      \"method\": \"Co-immunoprecipitation of TRIM3-UBC9, SUMOylation assay for ERα, TRIM3 knockdown/overexpression with ERα pathway reporter, cell viability assay\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, SUMOylation assay, epistasis via UBC9 silencing, single lab, two orthogonal methods\",\n      \"pmids\": [\"34508066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TRIM3 associates with ERα and promotes its stability via K63-linked polyubiquitination, thereby enhancing estrogen signaling and breast cancer cell proliferation and migration on a genome-wide scale.\",\n      \"method\": \"Co-immunoprecipitation, K63-specific ubiquitination assay, protein stability assay, RNA sequencing, luciferase reporter for ERα activity, TRIM3 depletion with proliferation/migration readout\",\n      \"journal\": \"Cell communication and signaling : CCS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, K63-specific ubiquitination, RNA-seq, single lab, multiple methods; note conflicting data with PMID:33292295 on p53 direction\",\n      \"pmids\": [\"35392925\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The isolated RING domain of human TRIM3 is monomeric and inactive as an E3 ligase due to placental mammal-specific amino acid changes adjacent to the core RING domain that prevent self-association but not E2 recognition. TRIM3 RING activity can be restored by substitution with the corresponding TRIM2 region or by heterodimerization with TRIM2. TRIM2 and TRIM3 interact in cells via their filamin and coiled-coil domains, respectively.\",\n      \"method\": \"Structural analysis of RING domain, in vitro ubiquitination assays, RING domain mutagenesis, co-immunoprecipitation of TRIM2-TRIM3 heterodimerization, biochemical dimerization analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with mutagenesis, structural domain mapping, heterodimerization Co-IP, multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"36481767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TRIM3 binds to microtubules via its C-terminal NHL-repeat region. TRIM3 is required for accumulation of acetylated tubulin following taxol treatment, and TRIM3 loss partially recapitulates the reduction in nocodazole-resistant microtubules seen with ATAT1 depletion. Loss of TRIM3 decreases ATAT1 protein levels independently of transcription.\",\n      \"method\": \"Differential extraction proteomics, nocodazole/taxol drug sensitivity assay quantitated by mass spectrometry, TRIM3 deletion mapping to NHL repeats, ATAT1 protein quantification after TRIM3 depletion, transcription-independent protein level analysis\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical microtubule association assay, domain mapping, functional consequences of depletion, single lab, novel finding\",\n      \"pmids\": [\"38149663\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRIM3 directly interacts with FABP4 and decreases FABP4 protein levels through ubiquitination-mediated degradation. TRIM3-mediated FABP4 degradation suppresses colorectal cancer cell migration, invasion, and lipid droplet formation. Overexpressed FABP4 reverses the effect of TRIM3 upregulation.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, TRIM3/FABP4 overexpression and knockdown, migration/invasion assays, lipid droplet quantification, in vivo liver metastasis model\",\n      \"journal\": \"Histology and histopathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP, ubiquitination assay, epistasis rescue experiment, single lab\",\n      \"pmids\": [\"37212515\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRIM3 directly interacts with the C-terminus of p53 (residues 320–393) and retains p53 in the cytoplasm to decrease its nuclear expression. In wild-type p53 CRC cells, cytoplasmic retention reduces p53 tumor-suppressive nuclear activity. In mutant p53 CRC cells, TRIM3 degrades nuclear mutant p53, reversing oxaliplatin chemotherapy resistance by downregulating multidrug resistance genes.\",\n      \"method\": \"Co-immunoprecipitation with p53 domain mapping, subcellular fractionation, immunostaining for p53 localization, TRIM3 overexpression/knockdown, drug resistance assays\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-specific Co-IP, subcellular localization, functional drug resistance readout, single lab\",\n      \"pmids\": [\"36894560\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIM3 promotes K48-linked ubiquitination and degradation of GRP78, a key ER stress protein. TRIM3 directly interacts with GRP78, and its overexpression in cisplatin-resistant cervical cancer cells suppresses drug resistance by promoting PERK activation and apoptosis downstream of GRP78 inhibition.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, TRIM3 overexpression with GRP78 rescue, apoptosis assay, drug resistance assay\",\n      \"journal\": \"Biochemistry and cell biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — Co-IP and ubiquitination assay, single lab, single paper, no in vitro reconstitution\",\n      \"pmids\": [\"39620445\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIM3 directly interacts with YAP1 and reduces YAP1 protein stability through ubiquitination, without affecting YAP1 mRNA levels. TRIM3 depletion increases YAP1 levels and promotes proliferation and mobility of melanoma cells; knockdown of YAP1 rescues the pro-tumorigenic effects of TRIM3 depletion.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, TRIM3/YAP1 overexpression/knockdown, rescue assay, qPCR for mRNA levels\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP and ubiquitination assay, single lab, no in vitro reconstitution\",\n      \"pmids\": [\"40715334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"TRIM3 interacts with TLR3 and promotes its K48-linked ubiquitination and degradation. Activation of the TRIM3/TLR3 axis induces IFN-β secretion and overrides feedback inhibition of IFN-β. Conversely, excess IFN-β inhibits TRIM3 expression, creating a reciprocal negative feedback loop. This mechanism suppresses NSCLC progression and reprograms the tumor microenvironment.\",\n      \"method\": \"Co-immunoprecipitation, Western blot for K48-linked ubiquitination, TLR3 protein stability assay, TRIM3 overexpression/knockdown, IFN-β ELISA, CD8+ T cell co-culture cytotoxicity assay, in vivo xenograft\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, K48-linked ubiquitination of TLR3 (consistent with PMID:32878999 for K63), feedback loop established by reciprocal expression analysis, single lab\",\n      \"pmids\": [\"41545343\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TRIM3 is a RING-type E3 ubiquitin ligase whose isolated RING domain is monomeric and inactive in placental mammals but can be activated by heterodimerization with TRIM2; it ubiquitinates multiple substrates—including GKAP/SAPAP1 (postsynaptic degradation), γ-actin (synaptic actin turnover), SLC7A11/xCT (K11-linked, promoting ferroptosis), TLR3 (K63-linked, promoting endolysosomal trafficking for antiviral signaling or K48-linked, promoting its degradation in cytokine modulation), p21, p53, ERα, GRP78, FABP4, Beclin1, importin α3, and ACTN4—thereby regulating dendritic spine morphology and hippocampal plasticity, asymmetric cell division via suppression of c-Myc and Notch/NICD nuclear transport through Importin binding, innate immune signaling, and tumor suppression across multiple cancer types; additionally, TRIM3 binds microtubules via its NHL domain and modulates acetylated tubulin levels by controlling ATAT1 abundance, and interacts with KIF21B kinesin to regulate dendritic motor motility.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TRIM3 (BERP) is a RING-type, microtubule- and vesicle-associated TRIM-family E3 ubiquitin ligase that couples substrate ubiquitination to the control of synaptic architecture, membrane trafficking, innate immune signaling, and tumor suppression [#7, #8, #10]. Its catalytic output depends on the RING domain, which in placental mammals is monomeric and inactive in isolation and is activated by heterodimerization with TRIM2 through their coiled-coil and filamin domains [#18]; reconstituted ligase activity uses UbcH5a as the preferred E2 [#7]. In neurons, TRIM3 ubiquitinates the postsynaptic scaffold GKAP/SAPAP1 to drive its proteasomal turnover and restrict dendritic spine head size [#2], and polyubiquitinates synaptic \\u03b3-actin\\u2014likely cotranslationally at mRNP granules\\u2014so that its loss elevates spine density, long-term potentiation, and contextual fear memory [#8]; it also assembles into a cytoskeletal recycling (CART) complex with Hrs/actinin-4/myosin V required for transferrin receptor recycling [#0] and binds the kinesin KIF21B to support dendritic motor motility independently of ligase activity [#4]. TRIM3 binds microtubules via its C-terminal NHL repeats and sustains acetylated tubulin levels by maintaining ATAT1 protein abundance [#19]. In innate immunity it controls TLR3: K63-linked ubiquitination at K831 directs TLR3 trafficking from Golgi to endolysosomes for dsRNA sensing [#10], while a distinct K48-linked modification promotes TLR3 turnover within an IFN-\\u03b2 feedback loop [#24]. As a tumor suppressor across glioma, lung, breast, colorectal and other cancers, TRIM3 restrains proliferation by ubiquitinating p21 [#7], suppresses glioblastoma stemness by limiting c-Myc and blocking Importin-dependent nuclear transport of the NOTCH1 intracellular domain [#6, #9], and promotes ferroptosis through K11-linked ubiquitination of SLC7A11/xCT at K37 via its NHL domain [#11]. Additional reported substrates and partners include p53, ER\\u03b1, GRP78, FABP4, Beclin1, importin \\u03b13/ACTN4 and YAP1, with conflicting reports on the direction of p53 regulation [#15, #16, #17, #21].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established the first physical partner of TRIM3, defining its N-terminal RBCC domain as a protein-interaction module that engages the actin-crosslinker \\u03b1-actinin-4.\",\n      \"evidence\": \"Yeast two-hybrid with RBCC bait plus reciprocal Co-IP and co-localization in PC12 cells\",\n      \"pmids\": [\"10673389\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"No functional consequence of the interaction established\", \"Ubiquitination of \\u03b1-actinin-4 not tested at this stage\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Placed TRIM3 in a defined cytoskeletal trafficking machine, showing it is a structural subunit of the CART complex required for receptor recycling rather than degradation.\",\n      \"evidence\": \"Reciprocal Co-IP, dominant-negative disruption of linear complex assembly, transferrin recycling and EGFR degradation assays\",\n      \"pmids\": [\"15772161\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Role of TRIM3 catalytic activity within the complex not addressed\", \"Whether complex assembly involves ubiquitination unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified TRIM3 as a functional E3 ligase in the brain that degrades a postsynaptic scaffold and shapes spine morphology, linking ubiquitination to synaptic remodeling.\",\n      \"evidence\": \"Co-IP, ubiquitination assay with proteasome rescue, RNAi in rat hippocampal neurons with spine morphology readout; separately, knockout mice with GABA-A trafficking/electrophysiology phenotype and p53-dependent expression\",\n      \"pmids\": [\"20352094\", \"20543135\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Direct ubiquitination site on GKAP not mapped\", \"Mechanism linking p53 to TRIM3 transcription not detailed\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Extended TRIM3 function into cell-cycle control and motor transport, showing a ligase-dependent tumor-suppressive role via p21 and a ligase-independent role in kinesin motility.\",\n      \"evidence\": \"Co-IP of TRIM3 with p21 and with KIF21B, mouse glioma model, neuronal motility assays\",\n      \"pmids\": [\"23318451\", \"24086586\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Whether p21 is ubiquitinated or merely sequestered not resolved here\", \"Mechanism by which TRIM3 drives KIF21B motility unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated that RING-dependent ligase activity is necessary for growth suppression and that TRIM3 restrains glioblastoma stemness as a human Brat ortholog.\",\n      \"evidence\": \"In vitro ubiquitination reconstitution of p21 with UbcH5a and RING mutagenesis; GBM reconstitution with stem-marker, neurosphere, and asymmetric-division readouts plus xenograft\",\n      \"pmids\": [\"24393003\", \"24947043\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Direct biochemical mechanism of c-Myc suppression not shown\", \"Link between p21 ubiquitination and asymmetric division not established\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Resolved how TRIM3 controls structural plasticity, showing it ubiquitinates \\u03b3-actin cotranslationally at synaptic mRNP granules to limit spine density, LTP, and memory.\",\n      \"evidence\": \"Trim3 knockout mice, in vitro \\u03b3-actin ubiquitination, TRIM3/Actg1 mRNP co-localization, spine, LTP, and fear-conditioning assays\",\n      \"pmids\": [\"26527743\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Cotranslational ubiquitination mechanism inferred rather than directly imaged\", \"Coupling to GKAP pathway not integrated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined a non-degradative tumor-suppressive mechanism whereby TRIM3 blocks Notch signaling by binding the Importin complex to prevent NICD nuclear entry.\",\n      \"evidence\": \"Co-IP of TRIM3 with Importin, NICD nuclear transport assay in GBM cells, Drosophila brat-RNAi tumor model\",\n      \"pmids\": [\"26893479\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Whether Importin binding requires ubiquitination not tested\", \"Direct NICD-TRIM3 interaction not demonstrated\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Connected TRIM3 to NF-\\u03baB regulation through ligase-dependent turnover of importin \\u03b13 and ACTN4, positioning it as a metastasis suppressor.\",\n      \"evidence\": \"Co-IP, ubiquitination and proteasomal degradation assays, NF-\\u03baB reporter and p65 methylation analysis, in vivo metastasis assays\",\n      \"pmids\": [\"30542119\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Ubiquitin linkage type not specified\", \"Direct cause-effect between substrate degradation and p65 methylation incomplete\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established a substrate-specific trafficking mechanism in innate immunity: K63-linked ubiquitination of TLR3 at K831 routes it from Golgi to endolysosomes for dsRNA sensing.\",\n      \"evidence\": \"Reconstituted K63-specific ubiquitination, K831 mutagenesis, subcellular fractionation/confocal localization, Trim3 knockout cells and mice, poly(I:C) stimulation; separate Low-confidence IRF3 phosphorylation report\",\n      \"pmids\": [\"32878999\", \"34643859\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"IRF3 interaction (Low confidence) lacks ubiquitination or reconstitution evidence\", \"How TRIM3 selects K63 versus K48 on TLR3 unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Explained the catalytic basis of TRIM3 regulation, revealing its RING is autoinhibited in placental mammals and activated by TRIM2 heterodimerization.\",\n      \"evidence\": \"RING structural analysis, in vitro ubiquitination with mutagenesis, TRIM2-TRIM3 heterodimerization Co-IP and domain mapping\",\n      \"pmids\": [\"36481767\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Which physiological substrates require TRIM2 partnering not delineated\", \"Whether all reported substrates depend on heterodimer activation untested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Diversified TRIM3 ubiquitin-linkage output and substrate range, including K11-linked degradation of SLC7A11 promoting ferroptosis and degradation of FABP4 suppressing lipid-driven metastasis.\",\n      \"evidence\": \"NHL-domain mapping, K11- and K48-linkage-specific ubiquitination, site mutagenesis (K37), proteasome rescue, ROS/lipid and migration assays, xenografts; plus cytoplasmic-retention control of p53 with domain mapping\",\n      \"pmids\": [\"37978273\", \"37212515\", \"36894560\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"NHL domain used for both microtubule and SLC7A11 binding; selectivity unexplained\", \"Direction of p53 regulation conflicts with other reports\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined a ubiquitination-independent cytoskeletal function: TRIM3 binds microtubules via NHL repeats and sustains acetylated tubulin by maintaining ATAT1 protein levels.\",\n      \"evidence\": \"Differential extraction proteomics, nocodazole/taxol drug-sensitivity mass spectrometry, NHL deletion mapping, ATAT1 protein quantification independent of transcription\",\n      \"pmids\": [\"38149663\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Whether ATAT1 is a direct TRIM3 substrate not shown\", \"Mechanism stabilizing ATAT1 unknown\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Revealed a second mode of TLR3 control, where K48-linked degradation of TLR3 operates within a reciprocal IFN-\\u03b2 negative-feedback loop suppressing lung cancer.\",\n      \"evidence\": \"Co-IP, K48-linked ubiquitination and TLR3 stability assays, IFN-\\u03b2 ELISA, CD8+ T cell cytotoxicity co-culture, xenograft\",\n      \"pmids\": [\"41545343\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Reconciliation with K63-linked stabilizing modification of TLR3 not mechanistically resolved\", \"Signal determining linkage choice unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TRIM3 selects among diverse substrates and ubiquitin-linkage types, and which functions require TRIM2 heterodimer activation versus ligase-independent scaffolding, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"No structural model of substrate engagement by the NHL domain\", \"Conflicting reports on p53 regulation direction unreconciled\", \"Determinants of K11 vs K48 vs K63 linkage selection unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [2, 7, 10, 11]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [2, 7, 8, 10, 11, 18]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 1, 4, 19]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [4, 10]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [4, 10]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [19]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [2, 7, 10, 11]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [10, 24]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [2, 8]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [11]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 10, 21]}\n    ],\n    \"complexes\": [\n      \"CART complex (Hrs/actinin-4/BERP/myosin V)\",\n      \"TRIM2-TRIM3 heterodimer\"\n    ],\n    \"partners\": [\n      \"TRIM2\",\n      \"ACTN4\",\n      \"KIF21B\",\n      \"GKAP/SAPAP1\",\n      \"TLR3\",\n      \"SLC7A11\",\n      \"importin \\u03b13\",\n      \"ESR1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}