{"gene":"TRIM72","run_date":"2026-06-10T10:51:56","timeline":{"discoveries":[{"year":2008,"finding":"MG53 (TRIM72) is a muscle-specific TRIM family protein that associates with intracellular vesicles via binding to phosphatidylserine, traffics to and fuses with the sarcolemmal membrane, and nucleates assembly of the cell membrane repair machinery. Oxidative stress upon membrane injury triggers MG53 oligomerization, recruiting MG53-containing vesicles to injury sites; subsequent extracellular Ca2+ entry facilitates vesicle fusion to reseal the membrane.","method":"Live cell imaging of GFP-MG53, lipid-binding assays, MG53 knockout mice, treadmill exercise/membrane repair assays, dye-entry into isolated muscle fibers","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (live imaging, KO mice, biochemical binding, functional repair assays) in a single high-impact study, foundational paper widely replicated","pmids":["19043407"],"is_preprint":false},{"year":2008,"finding":"MG53 regulates membrane budding and exocytosis in striated muscle; it is tightly associated with intracellular vesicles without a transmembrane segment and its activity is regulated by functional interaction with caveolin-3. RNAi knockdown impedes myoblast differentiation whereas overexpression enhances vesicle trafficking to and budding from the sarcolemmal membrane.","method":"Live cell confocal imaging of GFP-MG53, RNAi knockdown, co-expression studies, domain analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (imaging, knockdown, co-expression), replicated in subsequent studies","pmids":["19029292"],"is_preprint":false},{"year":2009,"finding":"MG53 interacts physically with dysferlin and caveolin-3 (Cav3) to form a molecular complex essential for membrane repair in skeletal muscle. MG53 mediates active trafficking of intracellular vesicles to the sarcolemma and is required for movement of dysferlin to injury sites during repair patch formation. Cav3 mutations (P104L, R26Q) that retain Cav3 in the Golgi result in aberrant localization of both MG53 and dysferlin, leading to defective membrane repair.","method":"Co-immunoprecipitation, live cell imaging, dominant-negative Cav3 mutant expression, membrane repair assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, dominant-negative genetics, live imaging with functional readout, replicated across labs","pmids":["19380584"],"is_preprint":false},{"year":2010,"finding":"MG53 is essential for cardiac ischemic preconditioning (IPC)-mediated cardioprotection. MG53 mediates interaction between caveolin-3 and the p85 subunit of PI3K, leading to activation of the reperfusion injury salvage kinase (RISK) pathway (PI3K-Akt-GSK3β and ERK1/2) without altering the SAFE (JAK-STAT3) pathway. MG53-deficient mice show increased myocardial vulnerability to ischemia/reperfusion injury and abolished IPC protection.","method":"MG53 knockout mice, Langendorff heart perfusion, neonatal cardiomyocyte overexpression/knockdown, Co-IP, kinase activity assays","journal":"Circulation","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse functional phenotype, Co-IP, pathway assays, multiple orthogonal approaches","pmids":["20516375"],"is_preprint":false},{"year":2010,"finding":"MG53-mediated cardiac membrane repair operates through a cholesterol-dependent mechanism: depletion of membrane cholesterol abolishes injury-induced MG53 translocation to damage sites, while cholesterol recovery restores it. Oxidation of MG53 confers stability to the membrane repair patch but does not initiate MG53 translocation. MG53 ablation prevents sarcolemmal resealing after laser-induced damage in intact heart.","method":"Infrared laser membrane damage in intact hearts, cholesterol depletion/repletion experiments, MG53 KO mice, live cell imaging","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Strong — functional KO, direct pharmacological manipulation of cholesterol with imaging readout, multiple injury modalities","pmids":["20466981"],"is_preprint":false},{"year":2010,"finding":"TRIM72 (MG53) negatively regulates skeletal myogenesis by associating with insulin receptor substrate-1 (IRS-1) in sarcolemmal lipid rafts, suppressing IGF-induced IRS-1 activation. TRIM72 overexpression prevents C2C12 myogenesis; TRIM72 silencing or knockout enhances myogenesis and Akt activation. TRIM72 transcription is driven by MyoD/Akt-dependent activation of two proximal E-boxes in the TRIM72 promoter.","method":"Adenoviral overexpression, RNAi knockdown, TRIM72−/− satellite cells, Co-IP, promoter analysis","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse, overexpression and knockdown with functional readout, Co-IP, promoter mutagenesis","pmids":["20139895"],"is_preprint":false},{"year":2011,"finding":"Polymerase I and transcript release factor (PTRF/cavin-1) acts as a docking protein for MG53 at membrane injury sites, potentially by binding exposed membrane cholesterol. Cells lacking PTRF show defective MG53 trafficking to injury sites; a disease-associated PTRF mutation causes aberrant nuclear localization of PTRF and disrupts MG53 membrane repair function.","method":"RNAi knockdown of PTRF, PTRF overexpression rescue, live cell imaging, PTRF mutant expression, membrane repair assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockdown/rescue with functional imaging readout, disease mutant validation, multiple cell systems","pmids":["21343302"],"is_preprint":false},{"year":2011,"finding":"Redox-dependent MG53 oligomerization through leucine zipper motif LZ1 (residues L176/L183/L190/V197) in the coiled-coil domain is essential for translocation to membrane injury sites. Cys242 oxidation (disulfide bond formation) is an obligatory step; LZ1 mutations (but not LZ2) diminish redox-dependent oligomerization and impair MG53 translocation. Alkylation of cysteine residues in vivo prevents MG53 movement to injury sites.","method":"Site-directed mutagenesis, chemical cross-linking, GFP-MG53 live cell imaging, alkylating reagent treatment, mechanical membrane damage assays","journal":"American journal of physiology. Cell physiology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis combined with live cell imaging functional readout, chemical cross-linking, multiple mutants tested","pmids":["21525429"],"is_preprint":false},{"year":2011,"finding":"MG53 participates in ischemic postconditioning (PostC)-mediated cardioprotection through the RISK signaling pathway. Structure-function analysis shows MG53 TRIM domain (aa1–284) physically interacts with Cav3 but not p85-PI3K, while the SPRY domain (aa285–477) interacts with p85-PI3K but not Cav3, establishing that MG53 tethers Cav3 and PI3K via its N- and C-termini respectively to activate RISK.","method":"MG53-KO mouse Langendorff perfusion, domain deletion constructs, Co-IP with isolated domains, PostC protocol","journal":"Cardiovascular research","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse, domain-level Co-IP with specific deletion constructs, functional cardioprotection assay","pmids":["21285295"],"is_preprint":false},{"year":2012,"finding":"Nonmuscle myosin IIA (NM-IIA) physically interacts with MG53 and is required for vesicle trafficking during cell membrane repair. NM-IIA-deficient cells fail to translocate MG53 to injury sites; rescue of NM-IIA restores MG53-mediated repair. Pharmacological alteration of NM-IIA motor function also compromises membrane repair.","method":"Co-immunoprecipitation, NM-IIA knockdown/rescue, pharmacological inhibition of NM-IIA, live cell imaging of MG53 translocation, dye-entry membrane repair assay","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP, genetic knockdown with rescue, pharmacological validation, imaging readout","pmids":["22253476"],"is_preprint":false},{"year":2012,"finding":"The C2A domain of dysferlin is important for Ca2+-dependent association with MG53 dimers. Wild-type dysferlin associates with MG53 dimers in a Ca2+-dependent manner; MG53 oligomers associate with both wild-type and C2A-mutant dysferlin in a Ca2+-independent manner. A pathogenic C2A missense mutation (W52R) inhibits the association with MG53 dimers. Co-expression of C242A-MG53 (dimer but not oligomer form) impairs recruitment of both MG53 and dysferlin to sarcolemmal injury sites.","method":"Immunoprecipitation, pulldown assays, Ca2+-dependency experiments, live cell imaging of dysferlin and MG53 behavior during sarcolemmal wounding, pathogenic and engineered MG53 mutants","journal":"PLoS currents","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pulldown, IP, live imaging with multiple mutants; single lab, journal is not peer-reviewed in the traditional sense","pmids":["23145354"],"is_preprint":false},{"year":2013,"finding":"MG53 functions as an E3 ubiquitin ligase mediating ubiquitin-dependent degradation of the insulin receptor (IR) and insulin receptor substrate-1 (IRS1) in skeletal muscle. MG53 overexpression is sufficient to trigger muscle insulin resistance and metabolic syndrome in mice; ablation of MG53 preserves IR, IRS1, and insulin signaling integrity and prevents diet-induced metabolic syndrome.","method":"MG53 transgenic and knockout mice, ubiquitination assays, IR/IRS1 degradation assays, glucose/insulin tolerance tests, Western blotting","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro ubiquitination assay, KO and transgenic mice, multiple metabolic readouts, high-impact peer-reviewed study","pmids":["23354051"],"is_preprint":false},{"year":2013,"finding":"MG53 is an E3 ubiquitin ligase that induces IRS-1 ubiquitination with the aid of E2-conjugating enzyme UBE2H. Disruption of MG53 E3-ligase function (RING domain mutations) abolishes IRS-1 ubiquitination and enhances skeletal myogenesis. Elevated IRS-1 in MG53−/− skeletal muscle protects from high-fat/high-sucrose diet-induced insulin resistance.","method":"E3-ligase domain mutations, ubiquitination assays, MG53−/− mice, high-fat/high-sucrose diet challenge, Co-IP for UBE2H-MG53-IRS1 complex","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro ubiquitination reconstitution with E2/E3 identification, RING domain mutagenesis, KO mouse metabolic phenotype, multiple orthogonal methods","pmids":["23965929"],"is_preprint":false},{"year":2013,"finding":"MG53 ubiquitinates focal adhesion kinase (FAK) using E2 enzyme UBE2H during skeletal myogenesis, reducing FAK protein levels without affecting mRNA. The RING domain of MG53 is required for FAK ubiquitination; RING-disrupted mutants (C14A and ΔR) abolish FAK ubiquitination and degradation.","method":"Endogenous and exogenous Co-IP for MG53-UBE2H-FAK complex, overexpression/knockdown ubiquitination assays, RING domain mutants in myoblasts and myotubes","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — ubiquitination assay, reciprocal Co-IP, RING domain mutagenesis, knockdown validation","pmids":["24344130"],"is_preprint":false},{"year":2014,"finding":"S-nitrosylation of TRIM72 at cysteine 144 (C144) by S-nitrosoglutathione (GSNO) prevents oxidation-induced protein degradation and promotes cell survival. C144S mutation renders TRIM72 resistant to H2O2-induced degradation, whereas GSNO treatment preserves wild-type TRIM72 levels and blocks ischemia/reperfusion-induced decrease in TRIM72, reducing infarct size. C144 SNO competes with irreversible oxidation to protect protein stability.","method":"C144S site-directed mutagenesis, H2O2 treatment, GSNO treatment, Langendorff-perfused heart I/R model, infarct size measurement, Western blotting for protein stability","journal":"Journal of molecular and cellular cardiology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — site-directed mutagenesis, chemical SNO agent, in vivo Langendorff I/R validation, multiple readouts","pmids":["24487118"],"is_preprint":false},{"year":2015,"finding":"Zinc (Zn2+) binding to the RING and B-box motifs of MG53 is indispensable for assembly of the cell membrane repair machinery. Extracellular Zn2+ entry is essential for translocation of MG53-containing vesicles to acute membrane injury sites; this effect is abolished in mg53−/− muscle fibers. Mutagenesis of Zn2+-binding residues in RING and B-box abolishes MG53-mediated membrane repair.","method":"Live cell imaging, Zn2+ chelation and supplementation, MG53 KO muscle fibers, RING and B-box mutagenesis, membrane repair assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis of two zinc-binding domains, live imaging, KO validation, pharmacological chelation","pmids":["25869134"],"is_preprint":false},{"year":2015,"finding":"MG53 translocates to acute injury sites on renal proximal tubular epithelial (PTE) cells, forms a repair patch, and binds phosphatidylserine at injury sites. MG53-deficient mice develop pronounced tubulointerstitial injury and increased susceptibility to ischemia/reperfusion-induced acute kidney injury.","method":"Live cell imaging of MG53 translocation, MG53 KO mice, I/R and nephrotoxin injury models, histology, serum creatinine/BUN measurement, rhMG53 treatment","journal":"Science translational medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse phenotype, live imaging, recombinant protein rescue, multiple injury models","pmids":["25787762"],"is_preprint":false},{"year":2015,"finding":"MG53 interferes with TGF-β-dependent activation of myofibroblast differentiation during wound healing, down-regulating α-smooth muscle actin and extracellular matrix proteins, thereby reducing scarring. MG53-deficient mice show delayed wound healing, abnormal scarring, and collagen overproduction. MG53 also facilitates fibroblast migration in response to scratch wounding.","method":"MG53 KO mice, scratch wound assay, TGF-β stimulation with rhMG53 treatment, Western blotting for α-SMA and ECM proteins, rodent dermal injury models","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse, functional assays, TGF-β pathway readout; single lab","pmids":["26306047"],"is_preprint":false},{"year":2015,"finding":"MG53 transcriptional upregulation of peroxisome proliferator-activated receptor alpha (PPARα) and its target genes in cardiomyocytes leads to lipid accumulation and lipotoxicity. MG53 transgenic mice develop diabetic cardiomyopathy with insulin resistance, lipid accumulation, hypertrophy, and fibrosis via dual mechanisms: PPARα upregulation and destabilization of IR and IRS1.","method":"Cardiac-specific MG53 transgenic mice, echocardiography, lipid assays, Western blotting for IR/IRS1, PPARα target gene expression, histology","journal":"Circulation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transgenic mouse model, multiple metabolic/cardiac readouts, PPARα pathway analysis; single lab","pmids":["25637627"],"is_preprint":false},{"year":2018,"finding":"TRIM72 undergoes mono-ADP-ribosylation at arginine residues (R207, R260) by ADP-ribosyltransferase 1 (ART1), and this modification is reversed by ARH1. ADP-ribosylated TRIM72 levels are elevated in ARH1-deficient mice after I/R injury. Mutant TRIM72 (R207K/R260K) that cannot be ADP-ribosylated interferes with assembly of TRIM72 repair complexes at laser-induced injury sites, and mono-ADP-ribosylation inhibitors block TRIM72 oligomerization.","method":"ARH1-deficient mice, C2C12 knockdown/scratch assay, mutant TRIM72 live cell imaging, mono-ADP-ribosylation inhibitors (vitamin K1, novobiocin), Co-IP from heart lysates","journal":"JCI insight","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mice, site-directed mutants with imaging, pharmacological inhibitors; single lab study","pmids":["30429362"],"is_preprint":false},{"year":2019,"finding":"MG53 acts as a glucose-sensitive myokine/cardiokine secreted from striated muscle in response to high glucose or high insulin. Circulating MG53 binds the extracellular domain of the insulin receptor and acts as an allosteric blocker of insulin signaling. Neutralizing circulating MG53 with monoclonal antibodies has therapeutic effects in diabetic db/db mice.","method":"Perfused rodent heart/skeletal muscle, Co-immunoprecipitation and surface plasmon resonance for MG53-insulin receptor extracellular domain interaction, cardiac-specific MG53 transgenic mice, monoclonal antibody neutralization in db/db mice","journal":"Circulation","confidence":"High","confidence_rationale":"Tier 1 / Moderate — surface plasmon resonance for direct binding measurement, Co-IP, in vivo genetic and antibody interventions; single lab but multiple orthogonal methods","pmids":["30586741"],"is_preprint":false},{"year":2019,"finding":"MG53 modulates G3BP2 activity in non-small cell lung cancer through physical interaction via the TRIM domain of MG53, inducing nuclear translocation of G3BP2 and blocking stress granule formation. Loss of MG53 promotes lung cancer progression; MG53 anti-proliferative effects on NSCLC cells are abolished with G3BP2 knockout.","method":"Co-immunoprecipitation for MG53-G3BP2 interaction, shRNA knockdown, live cell imaging, xenograft and allograft tumor models, domain mapping","journal":"Molecular cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain mapping, genetic KO rescue, in vivo tumor models; single lab","pmids":["34521423"],"is_preprint":false},{"year":2020,"finding":"High glucose represses AMPK signaling via MG53 E3-ubiquitin-ligase-mediated AMPKα ubiquitination and degradation. Specifically, high-glucose-stimulated ROS signals AKT to phosphorylate AMPKα at S485/491, which recruits MG53 and triggers ubiquitination and proteasomal degradation of AMPKα. High glucose also deactivates AMPK by ROS-dependent suppression of AMPKα T172 phosphorylation.","method":"In vitro ubiquitination assays, phosphomimetic AMPKα mutants, ROS manipulation, AKT inhibitors, MG53 knockdown/overexpression, co-immunoprecipitation","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro ubiquitination assay, phospho-site mutagenesis, multiple pathway inhibitors, Co-IP; single lab but multiple orthogonal methods","pmids":["33400924"],"is_preprint":false},{"year":2020,"finding":"MG53 is expressed in human macrophages and suppresses type I interferon (IFNβ) production upon viral infection by inhibiting RyR-mediated intracellular calcium oscillation and subsequent NFκB signaling activation. MG53 knockdown in macrophages increases IFNβ upon infection; MG53 KO mice infected with influenza show elevated IFNβ and increased morbidity. MG53 inhibits IFNβ induction in an RyR-dependent manner.","method":"MG53 knockdown in macrophages, MG53 KO mouse infection model, calcium imaging, RyR inhibitor rescue, NFκB reporter assays","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse, RyR-dependency test, knockdown in primary cells; single lab","pmids":["32681036"],"is_preprint":false},{"year":2020,"finding":"Cardiac ischemic preconditioning promotes MG53 secretion through H2O2-evoked activation of protein kinase C-δ (PKC-δ). Specifically, IPC-induced myocardial MG53 secretion is mediated by H2O2-triggered phosphorylation of PKC-δ at Y311, which is necessary and sufficient to facilitate MG53 secretion from cardiomyocytes without causing membrane leakage.","method":"Proteomic analysis, pharmacological and genetic manipulation of PKC-δ, Y311 phospho-mutants, rodent in vivo and isolated perfused heart models, neonatal cardiomyocyte culture","journal":"Circulation","confidence":"High","confidence_rationale":"Tier 2 / Strong — site-specific phospho-mutants, genetic and pharmacological approaches, in vivo and in vitro validation, multiple orthogonal methods","pmids":["32677469"],"is_preprint":false},{"year":2021,"finding":"MG53 inhibits necroptosis by acting as an E3 ubiquitin ligase that adds ubiquitin chains to RIPK1 at residues K316, K604, and K627, promoting proteasome-mediated RIPK1 degradation. ROS generated during I/R injury promote interaction between MG53 and RIPK1. N-acetylcysteine disrupts the MG53-RIPK1 interaction and abolishes MG53-mediated cardioprotection.","method":"Co-immunoprecipitation, CRISPR/Cas9 and mutagenesis to identify ubiquitination sites, Western blotting, antioxidant treatment, hiPSC-derived cardiomyocyte H/R model, I/R mouse model","journal":"Frontiers in cardiovascular medicine","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — ubiquitination site mapping by mutagenesis, CRISPR KO, Co-IP, in vivo rescue; single lab","pmids":["35711363"],"is_preprint":false},{"year":2021,"finding":"MG53 interacts physically with the p65 subunit of NF-κB and can enter the nuclei of proximal tubular epithelial cells to directly suppress NF-κB activation, thereby reducing inflammation and kidney fibrosis.","method":"Co-IP of MG53 with p65, nuclear fractionation, MG53 KO and overexpression, unilateral ureteral obstruction model, histology for fibrosis","journal":"Kidney international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with p65, nuclear localization shown, KO mouse fibrosis model; single lab","pmids":["34757120"],"is_preprint":false},{"year":2021,"finding":"MG53 interacts with NF-κB pathway components TAK1 and IκBα (by Co-IP) and regulates NF-κB activity, thereby controlling KChIP2 transcription (confirmed by ChIP showing NF-κB binding to KChIP2 gene 5' regulatory region) and the fast transient outward K+ current (Ito,f) in cardiomyocytes. MG53 knockout reduces KChIP2/Ito,f; MG53 overexpression increases it.","method":"Co-immunoprecipitation (MG53 with TAK1 and IκBα), chromatin immunoprecipitation for NF-κB at KChIP2 promoter, MG53 KO mice, adenoviral overexpression/knockdown, patch-clamp electrophysiology, pressure-overload cardiac hypertrophy model","journal":"Circulation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ChIP, electrophysiology with KO/OE; single lab","pmids":["30760025"],"is_preprint":false},{"year":2022,"finding":"MG53 binds to cardiolipin (CL), a mitochondria-specific lipid, and translocates to mitochondria after ischemic injury. rhMG53 treatment reduces superoxide generation and inhibits mitophagy in cardiomyocytes, preserving mitochondrial integrity.","method":"Lipid-binding assay for cardiolipin, fluorescent imaging of MG53 localization to mitochondria in vivo/in vitro, mt-mKeima mitophagy reporter, superoxide detection","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct lipid-binding assay, imaging of translocation, functional mitophagy reporter; single lab","pmids":["35679798"],"is_preprint":false},{"year":2022,"finding":"MG53 phosphorylation at serine 255 (S255) by GSK3β is a prerequisite for MG53 E3 ligase activity. Elevated S255 phosphorylation in metabolic disorder models enhances E3 ligase activity, forming a vicious cycle with IR-IRS1-GSK3β-MG53. The S255A mutant eliminates E3 ligase activity while retaining cell-protective membrane repair function, providing cardioprotection in diabetic mice without adverse metabolic effects.","method":"Immunoprecipitation-mass spectrometry to identify phosphosite, in vitro kinase assay with GSK3β, S255A site-directed mutagenesis, knock-in mice, db/db diabetic mouse I/R model","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay, phosphosite mutagenesis, knock-in mouse validation, diabetic disease model; multiple orthogonal methods","pmids":["36337049"],"is_preprint":false},{"year":2022,"finding":"MG53 binds to p53 and promotes its ubiquitination and proteasomal degradation, reducing apoptosis and elevating proliferation in trophoblasts. CVMSC-derived exosomes upregulate TRIM72/MG53 expression, which in turn degrades p53.","method":"Co-immunoprecipitation for TRIM72-p53 interaction, ubiquitination assay, luciferase reporter, Western blotting, mRNA sequencing","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ubiquitination assay, functional cell assays; single lab","pmids":["34788479"],"is_preprint":false},{"year":2022,"finding":"MG53 succinylation at K130 suppresses its ubiquitination at the same residue and stabilizes MG53 protein. SIRT7 inhibits and KAT3B promotes succinylation of MG53 at K130; SIRT7 aggravates and KAT3B alleviates MG53-mediated protection against hypoxia/reoxygenation-induced cardiomyocyte injury. The relationship between MG53 and KAT3B or SIRT7 was confirmed by co-IP.","method":"Co-immunoprecipitation for MG53-KAT3B and MG53-SIRT7 interactions, IP for succinylation and ubiquitination levels, site-specific mutagenesis at K130","journal":"Clinical and experimental hypertension","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, succinylation/ubiquitination assays at specific site; single lab","pmids":["37848382"],"is_preprint":false},{"year":2023,"finding":"Complete crystal structure of Mus musculus TRIM72 (BCC-SPRY domains) reveals the molecular basis of TRIM72 oligomerization, which is closely linked to disulfide bond formation. Phosphatidylserine-enriched membrane interaction is necessary for oligomeric assembly and ubiquitination activity of TRIM72. Cryo-electron tomography and subtomogram averaging elucidated a higher-order TRIM72 assembly on the phospholipid bilayer. TRIM72 also interacts with several other negatively charged lipids beyond phosphatidylserine.","method":"Cryo-electron tomography and subtomogram averaging, crystal structure of BCC-SPRY domains, structure-guided mutagenesis, biochemical ubiquitination assays, lipid binding assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus cryo-ET, structure-guided mutagenesis with functional validation, in vitro ubiquitination assay; multiple orthogonal methods in one study","pmids":["36944613"],"is_preprint":false},{"year":2023,"finding":"Crystal structure of mouse TRIM72 (complete RING-B-box-coiled-coil-SPRY model) shows that phosphatidylserine-membrane interaction is necessary for oligomeric assembly and ubiquitination activity. Structure-function study on the membrane identifies key interdomain contacts for RING E3 ligase activation through higher-order assembly on membranes.","method":"Cryo-EM structure of full-length TRIM72, biochemical ubiquitination assays, phosphatidylserine binding assays, domain mutagenesis","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — near-complete structural model, in vitro ubiquitination reconstitution, membrane-binding mutagenesis; rigorous single-study with multiple orthogonal methods","pmids":["37770719"],"is_preprint":false},{"year":2023,"finding":"MG53 E3 ligase activity mediates K48-linked ubiquitination and proteasomal degradation of cyclin D1, causing G1 cell cycle arrest and suppression of cancer cell proliferation in colorectal and gastric cancer.","method":"In vitro ubiquitination assays, K48-linkage specific ubiquitin experiments, MG53 overexpression/knockdown in cancer cells, xenograft tumor models, AOM/DSS colorectal cancer model","journal":"Signal transduction and targeted therapy","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — ubiquitination assay with linkage specificity, in vivo tumor models; single lab","pmids":["37414783"],"is_preprint":false},{"year":2023,"finding":"MG53 directly binds p53 tumor suppressor to regulate its ubiquitination and degradation via the RING E3 ligase domain, thereby preventing DOX-induced ferroptosis by maintaining SLC7A11 and GPX4 levels through the p53/SLC7A11/GPX4 pathway.","method":"Co-IP for MG53-p53 interaction, ubiquitination assay, MG53 overexpression and p53 knockdown in cardiomyocytes, in vivo DIC mouse model, cardiac function assessment","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ubiquitination assay, genetic KO/OE with functional ferroptosis readout; single lab","pmids":["39111582"],"is_preprint":false},{"year":2023,"finding":"p55γ recruits MG53 as the E3 ligase to mediate ubiquitin-dependent degradation of RIP3, thereby suppressing ischemia-induced myocardial necroptosis. p55γ directly binds and degrades RIP3 in an MG53-dependent manner; IPC-mediated suppression of necroptosis is attenuated in p55γ-deficient hearts.","method":"Co-IP and pulldown assays for p55γ-MG53-RIP3 complex, p55γ transgenic and KO mice, mass spectrometry, ChIP for Hif1α at p55γ promoter, in vivo LAD ligation I/R model","journal":"Cardiovascular research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, pulldown, KO/transgenic mice with functional readout; single lab","pmids":["37527538"],"is_preprint":false},{"year":2022,"finding":"MG53 catalyzes K48-linked polyubiquitination of RAC1 at Lys5 via its coiled-coil domain direct interaction with RAC1, suppressing RAC1 activity and the RAC1-MAPK signaling axis in hepatocellular carcinoma cells.","method":"Co-IP for MG53-RAC1 interaction, domain deletion mutants, in vitro ubiquitination assay, K48-specific ubiquitin chains, RAC1 activity assay, xenograft models","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro ubiquitination with linkage specificity, Co-IP with domain mapping; single lab","pmids":["35858925"],"is_preprint":false},{"year":2022,"finding":"TRIM72 interacts with and ubiquitinates MGMT (O6-methylguanine DNA methyl transferase) for proteasomal degradation. TRIM72 knockdown increases MGMT protein levels while reducing its ubiquitination; ectopic TRIM72 expression sensitizes uveal melanoma cells to dacarbazine treatment.","method":"Co-IP for TRIM72-MGMT interaction, ubiquitination assay, shRNA knockdown, overexpression in UM cells, Western blotting","journal":"Cancer biomarkers","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ubiquitination assay, knockdown/overexpression with functional drug sensitivity readout; single lab","pmids":["34958003"],"is_preprint":false},{"year":2018,"finding":"TRIM72 physically interacts with complement receptor CRIg in alveolar macrophages (confirmed by pulldown, Co-IP, and gradient binding assays) and inhibits CRIg-mediated phagosome formation, suppressing complement receptor-mediated phagocytosis. Genetic ablation of TRIM72 leads to improved pathogen clearance, reduced cytokine storm, and improved survival in murine pneumonia models.","method":"Pulldown assay, Co-immunoprecipitation, gradient binding assay, TRIM72 KO mice, AM adoptive transfer, in vivo Pseudomonas aeruginosa pneumonia model","journal":"American journal of respiratory cell and molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple biochemical interaction assays, KO mouse with adoptive transfer confirmation, functional phagocytosis assay; single lab","pmids":["29268030"],"is_preprint":false},{"year":2015,"finding":"TRIM72 interacts with caveolin-1 (Cav1) in lung epithelial cells; deletion of any functional domain (RING, B-box, coiled-coil, or PRY-SPRY) abolishes the physical TRIM72-Cav1 interaction. TRIM72 loss reduces Cav1 at the plasma membrane and markedly attenuates caveolar endocytosis; TRIM72 overexpression selectively increases caveolar endocytosis. TRIM72 KO and Cav1 KO mice show increased lung cell death after injurious ventilation, with double KO being most severe.","method":"Co-immunoprecipitation with domain deletion mutants, caveolar endocytosis assays, lentiviral overexpression, TRIM72 KO and Cav1 KO mice, injurious ventilation model","journal":"American journal of physiology. Lung cellular and molecular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-deletion Co-IP, functional caveolar endocytosis assay, double KO epistasis; single lab","pmids":["26637632"],"is_preprint":false},{"year":2015,"finding":"MG53 translocates to injury sites on renal proximal tubular cells and binds phosphatidylserine to protect against contrast-induced membrane injury. MG53 translocation from serum to injury sites was shown by immunoblot and immunohistochemical staining in vivo.","method":"In vivo rat CI-AKI model with immunoblot and IHC for MG53 translocation, rhMG53 treatment, phosphatidylserine binding confirmation in RPT cells","journal":"Acta pharmacologica Sinica","confidence":"Low","confidence_rationale":"Tier 3 / Weak — localization by IHC/immunoblot, single lab, mostly confirms earlier mechanism","pmids":["32424239"],"is_preprint":false},{"year":2012,"finding":"TRIM72 binds various lipids in vitro including phosphatidylserine, palmitate, and stearate with Kd values in the nanomolar to submicromolar range. TRIM72 can be dynamically converted by stimuli (fluorescence-quenching changes in conformation reduce lipid binding affinity), suggesting regulated lipid-binding during sarcolemmal repair.","method":"In vitro lipid binding assay with fluorescence measurements, Kd determination, time-resolved fluorescence","journal":"BMB reports","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — direct in vitro binding assay with quantitative Kd, but single lab, limited mechanistic follow-up","pmids":["22281009"],"is_preprint":false}],"current_model":"TRIM72/MG53 is a muscle-enriched, redox-sensitive TRIM-family E3 ubiquitin ligase that (1) binds phosphatidylserine and cardiolipin on intracellular vesicles, undergoes oxidation- and Zn2+-dependent oligomerization via Cys242 and leucine-zipper motifs, and is recruited to membrane injury sites via cholesterol and PTRF/cavin-1 docking to nucleate a cell membrane repair patch in a cholesterol-dependent, Ca2+-facilitated process involving dysferlin, caveolin-3, and NM-IIA; (2) acts as an E3 ligase (with UBE2H as E2) to ubiquitinate and degrade multiple substrates including the insulin receptor, IRS-1, FAK, AMPKα, RIPK1, RIP3, cyclin D1, RAC1, p53, MGMT, and others, with E3 activity gated by GSK3β-mediated phosphorylation at Ser255 and by membrane-stimulated higher-order assembly; and (3) is secreted as a myokine/cardiokine via a PKC-δ-Y311-phosphorylation-dependent mechanism in response to oxidative stress or ischemic preconditioning, with circulating MG53 acting as an allosteric blocker of the insulin receptor extracellular domain and a multi-organ tissue-repair factor."},"narrative":{"mechanistic_narrative":"TRIM72 (MG53) is a muscle-enriched TRIM-family protein that nucleates the cell-membrane repair machinery at sites of sarcolemmal injury and doubles as a redox-regulated RING E3 ubiquitin ligase controlling metabolic and survival signaling [PMID:19043407, PMID:23354051]. In its repair role, MG53 associates with intracellular vesicles through binding to phosphatidylserine and other negatively charged lipids, and upon membrane wounding the resulting oxidative environment drives its oligomerization — an obligatory step requiring Cys242 disulfide formation and the LZ1 leucine-zipper motif of the coiled-coil domain — to translocate vesicles to the lesion [PMID:19043407, PMID:21525429]. Recruitment to the injury site is cholesterol-dependent and uses PTRF/cavin-1 as a docking protein, with Zn2+ binding to the RING and B-box motifs and the motor activity of nonmuscle myosin IIA required for assembly, while caveolin-3, dysferlin, and Ca2+-facilitated vesicle fusion complete the repair patch [PMID:19380584, PMID:20466981, PMID:21343302, PMID:22253476, PMID:25869134]. Crystallographic and cryo-electron tomography analyses show that phosphatidylserine-membrane engagement licenses higher-order MG53 assembly on the bilayer, which in turn activates its RING-dependent ubiquitination activity [PMID:36944613, PMID:37770719]. As an E3 ligase acting with the E2 enzyme UBE2H, MG53 ubiquitinates and degrades the insulin receptor and IRS-1 to suppress insulin signaling and myogenesis, and its ligase activity is gated by GSK3β-mediated phosphorylation at Ser255 [PMID:23354051, PMID:23965929, PMID:36337049]. The same activity targets a broad substrate set including FAK, AMPKα, RIPK1, and cyclin D1, linking MG53 to glucose handling, necroptosis suppression, and cell-cycle control [PMID:24344130, PMID:33400924, PMID:35711363, PMID:37414783]. MG53 is also secreted as a glucose-sensitive myokine/cardiokine through PKC-δ Y311 phosphorylation, and circulating MG53 binds the insulin-receptor extracellular domain as an allosteric blocker, functioning as a multi-organ tissue-repair and metabolic factor [PMID:30586741, PMID:32677469]. Genetic ablation studies establish MG53 as essential for membrane resealing in skeletal and cardiac muscle and kidney, and for ischemic pre-/postconditioning cardioprotection via caveolin-3–PI3K tethering and the RISK pathway [PMID:20516375, PMID:21285295, PMID:25787762].","teleology":[{"year":2008,"claim":"Established that MG53 is the nucleator of an acute cell-membrane repair response, answering how striated muscle reseals wounds and linking the process to vesicle lipid binding and oxidative triggering.","evidence":"Live imaging of GFP-MG53, lipid-binding assays, KO mice, and dye-entry repair assays in muscle fibers; plus imaging/knockdown showing vesicle budding and caveolin-3 interaction","pmids":["19043407","19029292"],"confidence":"High","gaps":["Molecular basis of oxidation sensing not yet defined","Composition of the repair patch beyond vesicle recruitment unresolved"]},{"year":2009,"claim":"Defined the membrane-repair partner complex, showing MG53 traffics dysferlin and depends on caveolin-3 localization, explaining why Cav3 mutations cause defective repair.","evidence":"Reciprocal Co-IP, dominant-negative Cav3 mutants, live imaging with repair readouts in skeletal muscle","pmids":["19380584"],"confidence":"High","gaps":["Stoichiometry and order of complex assembly unresolved","Direct vs indirect MG53-dysferlin contact not fully mapped"]},{"year":2010,"claim":"Extended MG53 function to the heart and to insulin signaling, establishing its role in ischemic preconditioning via caveolin-3/PI3K-RISK and as a negative regulator of IRS-1/myogenesis.","evidence":"KO mice with Langendorff perfusion, cholesterol depletion/repletion imaging, Co-IP, and IRS-1 raft-association/promoter analysis","pmids":["20516375","20466981","20139895"],"confidence":"High","gaps":["Whether IRS-1 regulation in 2010 was degradative was not yet defined","Cholesterol-sensing receptor for MG53 not identified"]},{"year":2011,"claim":"Dissected the molecular requirements for injury-site translocation — a docking protein and the redox-dependent oligomerization chemistry — and mapped domain-specific tethering of Cav3 and PI3K.","evidence":"PTRF knockdown/rescue imaging, LZ1/Cys242 mutagenesis with cross-linking and live imaging, and domain-deletion Co-IP with postconditioning assays","pmids":["21343302","21525429","21285295"],"confidence":"High","gaps":["How PTRF/cholesterol couples to oligomerization mechanistically unclear","Reversibility of disulfide-driven assembly not addressed"]},{"year":2012,"claim":"Resolved the cytoskeletal and Ca2+-dependent steps of repair and quantified MG53 lipid affinities, showing NM-IIA-driven vesicle transport and Ca2+-dependent dysferlin-dimer association.","evidence":"NM-IIA Co-IP/knockdown/rescue with imaging, dysferlin C2A-mutant pulldowns, and in vitro lipid-binding Kd measurements","pmids":["22253476","23145354","22281009"],"confidence":"Medium","gaps":["PLoS Currents/BMB findings from single labs with limited follow-up","Physiological lipid-conformation switching not validated in vivo"]},{"year":2013,"claim":"Identified MG53 as a bona fide E3 ubiquitin ligase, naming UBE2H as its E2 and IR, IRS-1, and FAK as degradation substrates, thereby mechanistically linking MG53 to insulin resistance and myogenesis.","evidence":"In vitro ubiquitination reconstitution, RING-domain mutagenesis, transgenic and KO mice with metabolic challenge, reciprocal Co-IP","pmids":["23354051","23965929","24344130"],"confidence":"High","gaps":["Ubiquitin linkage type for IR/IRS1 not fully specified in these studies","Trigger coupling membrane assembly to ligase activity not yet defined"]},{"year":2014,"claim":"Showed that cysteine redox chemistry regulates MG53 stability, with S-nitrosylation at C144 protecting against oxidation-induced degradation and limiting I/R damage.","evidence":"C144S mutagenesis, GSNO/H2O2 treatment, and Langendorff I/R with infarct measurement","pmids":["24487118"],"confidence":"High","gaps":["Endogenous nitrosylation machinery not identified","Interplay between C144 SNO and Cys242 oligomerization not resolved"]},{"year":2015,"claim":"Defined Zn2+ as a cofactor for repair assembly and extended MG53's repair/protective roles to kidney and dermal wound healing as a secreted/recombinant therapeutic.","evidence":"RING/B-box Zn-binding mutagenesis with chelation, KO mice in renal I/R and dermal injury models, rhMG53 treatment, TGF-β readouts","pmids":["25869134","25787762","26306047","25637627","26637632"],"confidence":"High","gaps":["Mechanism of extracellular Zn2+ entry into the repair process unclear","How secreted MG53 reaches distant injury sites not fully defined"]},{"year":2019,"claim":"Established MG53 as a circulating myokine/cardiokine and an allosteric insulin-receptor blocker, providing a humoral mechanism for systemic insulin resistance distinct from intracellular degradation.","evidence":"Perfused muscle/heart, surface plasmon resonance and Co-IP for IR-ectodomain binding, transgenic mice, and neutralizing antibody therapy in db/db mice; plus G3BP2 stress-granule interaction in NSCLC","pmids":["30586741","34521423"],"confidence":"High","gaps":["Secretion route of a transmembrane-less protein incompletely defined here","Relative contribution of circulating vs intracellular MG53 to disease unclear"]},{"year":2020,"claim":"Identified the secretion trigger (PKC-δ Y311 phosphorylation) and broadened MG53 ligase/regulatory functions to AMPKα degradation and innate-immune suppression.","evidence":"Y311 phospho-mutants and proteomics for secretion, in vitro ubiquitination with AMPKα phosphomimetics, and macrophage KO/RyR-dependency infection models","pmids":["32677469","33400924","32681036"],"confidence":"High","gaps":["Vesicular vs non-conventional secretion machinery not fully resolved","Immune findings rest on single-lab models"]},{"year":2022,"claim":"Pinpointed GSK3β-Ser255 phosphorylation as the switch gating E3 ligase activity independently of membrane repair, and expanded substrate range to RIPK1/RIP3, cardiolipin-mediated mitochondrial targeting, and post-translational stabilizing modifications.","evidence":"IP-MS phosphosite mapping, GSK3β kinase assay, S255A knock-in mice in diabetic I/R; ubiquitination site mapping for RIPK1; cardiolipin binding and mitophagy reporters; K130 succinylation Co-IP","pmids":["36337049","35711363","35679798","37848382","37527538"],"confidence":"High","gaps":["Several substrate/modification studies are single-lab","How Ser255 phosphorylation structurally activates the RING not defined"]},{"year":2023,"claim":"Provided the structural basis for membrane-coupled activation, showing phosphatidylserine engagement licenses higher-order assembly that activates RING E3 activity, and consolidated MG53's tumor-suppressive substrate network.","evidence":"Crystal structures of BCC-SPRY and near-complete RBCC-SPRY, cryo-ET subtomogram averaging, structure-guided mutagenesis with in vitro ubiquitination; cyclin D1, p53, RAC1, MGMT degradation assays with tumor models","pmids":["36944613","37770719","37414783","34788479","39111582","35858925","34958003"],"confidence":"High","gaps":["Cancer substrate findings largely single-lab","Full-length apo vs membrane-bound conformational transition not captured at atomic resolution"]},{"year":null,"claim":"It remains unresolved how the membrane-repair scaffold function and the substrate-selective E3 ligase function are coordinately controlled in vivo, and what governs the choice among MG53's many reported substrates in different tissues.","evidence":"No single study in the timeline integrates substrate selection, secretion, and repair within one regulatory framework","pmids":[],"confidence":"Low","gaps":["No unified model linking membrane assembly to substrate choice","Tissue-specific substrate prioritization undefined","In vivo relevance of many single-lab cancer substrates untested across labs"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[11,12,13,22,25,34,37]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[11,12,13,22]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[0,28,42]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[20]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[2,8]}],"localization":[{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[0,1]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,2,4]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[20,24,16]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[28]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[26]}],"pathway":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[11,12,13]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[11,12,22,34]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,8,20]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[25,35,36]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[34]}],"complexes":["MG53-dysferlin-caveolin-3 membrane repair complex","MG53-UBE2H E2-E3 ubiquitination complex"],"partners":["DYSF","CAV3","PTRF","UBE2H","MYH9","CAV1","G3BP2","RELA"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q6ZMU5","full_name":"Tripartite motif-containing protein 72","aliases":["Mitsugumin-53","Mg53"],"length_aa":477,"mass_kda":52.7,"function":"Muscle-specific E3 ubiquitin-protein ligase that plays a central role in cell membrane repair by nucleating the assembly of the repair machinery at injury sites (PubMed:36944613). Its ubiquitination activity is mediated by E2 ubiquitin-conjugating enzymes UBE2D1, UBE2D2 and UBE2D3 (By similarity). Acts as a sensor of oxidation: upon membrane damage, entry of extracellular oxidative environment results in disulfide bond formation and homooligomerization at the injury site (By similarity). This oligomerization acts as a nucleation site for recruitment of TRIM72-containing vesicles to the injury site, leading to membrane patch formation (By similarity). Probably acts upstream of the Ca(2+)-dependent membrane resealing process (By similarity). Required for transport of DYSF to sites of cell injury during repair patch formation (By similarity). Regulates membrane budding and exocytosis (By similarity). May be involved in the regulation of the mobility of KCNB1-containing endocytic vesicles (By similarity)","subcellular_location":"Cell membrane, sarcolemma; Cytoplasmic vesicle membrane","url":"https://www.uniprot.org/uniprotkb/Q6ZMU5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TRIM72","classification":"Not Classified","n_dependent_lines":9,"n_total_lines":1208,"dependency_fraction":0.0074503311258278145},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TRIM72","total_profiled":1310},"omim":[{"mim_id":"613288","title":"TRIPARTITE MOTIF-CONTAINING PROTEIN 72; TRIM72","url":"https://www.omim.org/entry/613288"},{"mim_id":"603198","title":"CAVEOLAE-ASSOCIATED PROTEIN 1; CAVIN1","url":"https://www.omim.org/entry/603198"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"skeletal muscle","ntpm":142.2},{"tissue":"tongue","ntpm":40.2}],"url":"https://www.proteinatlas.org/search/TRIM72"},"hgnc":{"alias_symbol":["MG53"],"prev_symbol":[]},"alphafold":{"accession":"Q6ZMU5","domains":[{"cath_id":"3.30.40.10","chopping":"1-67","consensus_level":"medium","plddt":82.2948,"start":1,"end":67},{"cath_id":"2.60.120.920","chopping":"286-468","consensus_level":"high","plddt":94.3675,"start":286,"end":468},{"cath_id":"3.90.20","chopping":"150-266","consensus_level":"medium","plddt":93.6009,"start":150,"end":266}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6ZMU5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q6ZMU5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q6ZMU5-F1-predicted_aligned_error_v6.png","plddt_mean":90.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TRIM72","jax_strain_url":"https://www.jax.org/strain/search?query=TRIM72"},"sequence":{"accession":"Q6ZMU5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q6ZMU5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q6ZMU5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6ZMU5"}},"corpus_meta":[{"pmid":"19043407","id":"PMC_19043407","title":"MG53 nucleates assembly of cell membrane repair machinery.","date":"2008","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/19043407","citation_count":414,"is_preprint":false},{"pmid":"23354051","id":"PMC_23354051","title":"Central role of E3 ubiquitin ligase MG53 in insulin resistance and metabolic disorders.","date":"2013","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/23354051","citation_count":252,"is_preprint":false},{"pmid":"19380584","id":"PMC_19380584","title":"Membrane repair defects in muscular dystrophy are linked to altered interaction between MG53, caveolin-3, and dysferlin.","date":"2009","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/19380584","citation_count":239,"is_preprint":false},{"pmid":"22723464","id":"PMC_22723464","title":"Recombinant MG53 protein modulates therapeutic cell membrane repair in treatment of muscular dystrophy.","date":"2012","source":"Science translational 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Oxidative stress upon membrane injury triggers MG53 oligomerization, recruiting MG53-containing vesicles to injury sites; subsequent extracellular Ca2+ entry facilitates vesicle fusion to reseal the membrane.\",\n      \"method\": \"Live cell imaging of GFP-MG53, lipid-binding assays, MG53 knockout mice, treadmill exercise/membrane repair assays, dye-entry into isolated muscle fibers\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (live imaging, KO mice, biochemical binding, functional repair assays) in a single high-impact study, foundational paper widely replicated\",\n      \"pmids\": [\"19043407\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"MG53 regulates membrane budding and exocytosis in striated muscle; it is tightly associated with intracellular vesicles without a transmembrane segment and its activity is regulated by functional interaction with caveolin-3. RNAi knockdown impedes myoblast differentiation whereas overexpression enhances vesicle trafficking to and budding from the sarcolemmal membrane.\",\n      \"method\": \"Live cell confocal imaging of GFP-MG53, RNAi knockdown, co-expression studies, domain analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (imaging, knockdown, co-expression), replicated in subsequent studies\",\n      \"pmids\": [\"19029292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"MG53 interacts physically with dysferlin and caveolin-3 (Cav3) to form a molecular complex essential for membrane repair in skeletal muscle. MG53 mediates active trafficking of intracellular vesicles to the sarcolemma and is required for movement of dysferlin to injury sites during repair patch formation. Cav3 mutations (P104L, R26Q) that retain Cav3 in the Golgi result in aberrant localization of both MG53 and dysferlin, leading to defective membrane repair.\",\n      \"method\": \"Co-immunoprecipitation, live cell imaging, dominant-negative Cav3 mutant expression, membrane repair assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, dominant-negative genetics, live imaging with functional readout, replicated across labs\",\n      \"pmids\": [\"19380584\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MG53 is essential for cardiac ischemic preconditioning (IPC)-mediated cardioprotection. MG53 mediates interaction between caveolin-3 and the p85 subunit of PI3K, leading to activation of the reperfusion injury salvage kinase (RISK) pathway (PI3K-Akt-GSK3β and ERK1/2) without altering the SAFE (JAK-STAT3) pathway. MG53-deficient mice show increased myocardial vulnerability to ischemia/reperfusion injury and abolished IPC protection.\",\n      \"method\": \"MG53 knockout mice, Langendorff heart perfusion, neonatal cardiomyocyte overexpression/knockdown, Co-IP, kinase activity assays\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse functional phenotype, Co-IP, pathway assays, multiple orthogonal approaches\",\n      \"pmids\": [\"20516375\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MG53-mediated cardiac membrane repair operates through a cholesterol-dependent mechanism: depletion of membrane cholesterol abolishes injury-induced MG53 translocation to damage sites, while cholesterol recovery restores it. Oxidation of MG53 confers stability to the membrane repair patch but does not initiate MG53 translocation. MG53 ablation prevents sarcolemmal resealing after laser-induced damage in intact heart.\",\n      \"method\": \"Infrared laser membrane damage in intact hearts, cholesterol depletion/repletion experiments, MG53 KO mice, live cell imaging\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — functional KO, direct pharmacological manipulation of cholesterol with imaging readout, multiple injury modalities\",\n      \"pmids\": [\"20466981\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TRIM72 (MG53) negatively regulates skeletal myogenesis by associating with insulin receptor substrate-1 (IRS-1) in sarcolemmal lipid rafts, suppressing IGF-induced IRS-1 activation. TRIM72 overexpression prevents C2C12 myogenesis; TRIM72 silencing or knockout enhances myogenesis and Akt activation. TRIM72 transcription is driven by MyoD/Akt-dependent activation of two proximal E-boxes in the TRIM72 promoter.\",\n      \"method\": \"Adenoviral overexpression, RNAi knockdown, TRIM72−/− satellite cells, Co-IP, promoter analysis\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse, overexpression and knockdown with functional readout, Co-IP, promoter mutagenesis\",\n      \"pmids\": [\"20139895\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Polymerase I and transcript release factor (PTRF/cavin-1) acts as a docking protein for MG53 at membrane injury sites, potentially by binding exposed membrane cholesterol. Cells lacking PTRF show defective MG53 trafficking to injury sites; a disease-associated PTRF mutation causes aberrant nuclear localization of PTRF and disrupts MG53 membrane repair function.\",\n      \"method\": \"RNAi knockdown of PTRF, PTRF overexpression rescue, live cell imaging, PTRF mutant expression, membrane repair assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockdown/rescue with functional imaging readout, disease mutant validation, multiple cell systems\",\n      \"pmids\": [\"21343302\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Redox-dependent MG53 oligomerization through leucine zipper motif LZ1 (residues L176/L183/L190/V197) in the coiled-coil domain is essential for translocation to membrane injury sites. Cys242 oxidation (disulfide bond formation) is an obligatory step; LZ1 mutations (but not LZ2) diminish redox-dependent oligomerization and impair MG53 translocation. Alkylation of cysteine residues in vivo prevents MG53 movement to injury sites.\",\n      \"method\": \"Site-directed mutagenesis, chemical cross-linking, GFP-MG53 live cell imaging, alkylating reagent treatment, mechanical membrane damage assays\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis combined with live cell imaging functional readout, chemical cross-linking, multiple mutants tested\",\n      \"pmids\": [\"21525429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"MG53 participates in ischemic postconditioning (PostC)-mediated cardioprotection through the RISK signaling pathway. Structure-function analysis shows MG53 TRIM domain (aa1–284) physically interacts with Cav3 but not p85-PI3K, while the SPRY domain (aa285–477) interacts with p85-PI3K but not Cav3, establishing that MG53 tethers Cav3 and PI3K via its N- and C-termini respectively to activate RISK.\",\n      \"method\": \"MG53-KO mouse Langendorff perfusion, domain deletion constructs, Co-IP with isolated domains, PostC protocol\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse, domain-level Co-IP with specific deletion constructs, functional cardioprotection assay\",\n      \"pmids\": [\"21285295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Nonmuscle myosin IIA (NM-IIA) physically interacts with MG53 and is required for vesicle trafficking during cell membrane repair. NM-IIA-deficient cells fail to translocate MG53 to injury sites; rescue of NM-IIA restores MG53-mediated repair. Pharmacological alteration of NM-IIA motor function also compromises membrane repair.\",\n      \"method\": \"Co-immunoprecipitation, NM-IIA knockdown/rescue, pharmacological inhibition of NM-IIA, live cell imaging of MG53 translocation, dye-entry membrane repair assay\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, genetic knockdown with rescue, pharmacological validation, imaging readout\",\n      \"pmids\": [\"22253476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The C2A domain of dysferlin is important for Ca2+-dependent association with MG53 dimers. Wild-type dysferlin associates with MG53 dimers in a Ca2+-dependent manner; MG53 oligomers associate with both wild-type and C2A-mutant dysferlin in a Ca2+-independent manner. A pathogenic C2A missense mutation (W52R) inhibits the association with MG53 dimers. Co-expression of C242A-MG53 (dimer but not oligomer form) impairs recruitment of both MG53 and dysferlin to sarcolemmal injury sites.\",\n      \"method\": \"Immunoprecipitation, pulldown assays, Ca2+-dependency experiments, live cell imaging of dysferlin and MG53 behavior during sarcolemmal wounding, pathogenic and engineered MG53 mutants\",\n      \"journal\": \"PLoS currents\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pulldown, IP, live imaging with multiple mutants; single lab, journal is not peer-reviewed in the traditional sense\",\n      \"pmids\": [\"23145354\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MG53 functions as an E3 ubiquitin ligase mediating ubiquitin-dependent degradation of the insulin receptor (IR) and insulin receptor substrate-1 (IRS1) in skeletal muscle. MG53 overexpression is sufficient to trigger muscle insulin resistance and metabolic syndrome in mice; ablation of MG53 preserves IR, IRS1, and insulin signaling integrity and prevents diet-induced metabolic syndrome.\",\n      \"method\": \"MG53 transgenic and knockout mice, ubiquitination assays, IR/IRS1 degradation assays, glucose/insulin tolerance tests, Western blotting\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro ubiquitination assay, KO and transgenic mice, multiple metabolic readouts, high-impact peer-reviewed study\",\n      \"pmids\": [\"23354051\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MG53 is an E3 ubiquitin ligase that induces IRS-1 ubiquitination with the aid of E2-conjugating enzyme UBE2H. Disruption of MG53 E3-ligase function (RING domain mutations) abolishes IRS-1 ubiquitination and enhances skeletal myogenesis. Elevated IRS-1 in MG53−/− skeletal muscle protects from high-fat/high-sucrose diet-induced insulin resistance.\",\n      \"method\": \"E3-ligase domain mutations, ubiquitination assays, MG53−/− mice, high-fat/high-sucrose diet challenge, Co-IP for UBE2H-MG53-IRS1 complex\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro ubiquitination reconstitution with E2/E3 identification, RING domain mutagenesis, KO mouse metabolic phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"23965929\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MG53 ubiquitinates focal adhesion kinase (FAK) using E2 enzyme UBE2H during skeletal myogenesis, reducing FAK protein levels without affecting mRNA. The RING domain of MG53 is required for FAK ubiquitination; RING-disrupted mutants (C14A and ΔR) abolish FAK ubiquitination and degradation.\",\n      \"method\": \"Endogenous and exogenous Co-IP for MG53-UBE2H-FAK complex, overexpression/knockdown ubiquitination assays, RING domain mutants in myoblasts and myotubes\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — ubiquitination assay, reciprocal Co-IP, RING domain mutagenesis, knockdown validation\",\n      \"pmids\": [\"24344130\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"S-nitrosylation of TRIM72 at cysteine 144 (C144) by S-nitrosoglutathione (GSNO) prevents oxidation-induced protein degradation and promotes cell survival. C144S mutation renders TRIM72 resistant to H2O2-induced degradation, whereas GSNO treatment preserves wild-type TRIM72 levels and blocks ischemia/reperfusion-induced decrease in TRIM72, reducing infarct size. C144 SNO competes with irreversible oxidation to protect protein stability.\",\n      \"method\": \"C144S site-directed mutagenesis, H2O2 treatment, GSNO treatment, Langendorff-perfused heart I/R model, infarct size measurement, Western blotting for protein stability\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — site-directed mutagenesis, chemical SNO agent, in vivo Langendorff I/R validation, multiple readouts\",\n      \"pmids\": [\"24487118\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Zinc (Zn2+) binding to the RING and B-box motifs of MG53 is indispensable for assembly of the cell membrane repair machinery. Extracellular Zn2+ entry is essential for translocation of MG53-containing vesicles to acute membrane injury sites; this effect is abolished in mg53−/− muscle fibers. Mutagenesis of Zn2+-binding residues in RING and B-box abolishes MG53-mediated membrane repair.\",\n      \"method\": \"Live cell imaging, Zn2+ chelation and supplementation, MG53 KO muscle fibers, RING and B-box mutagenesis, membrane repair assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis of two zinc-binding domains, live imaging, KO validation, pharmacological chelation\",\n      \"pmids\": [\"25869134\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MG53 translocates to acute injury sites on renal proximal tubular epithelial (PTE) cells, forms a repair patch, and binds phosphatidylserine at injury sites. MG53-deficient mice develop pronounced tubulointerstitial injury and increased susceptibility to ischemia/reperfusion-induced acute kidney injury.\",\n      \"method\": \"Live cell imaging of MG53 translocation, MG53 KO mice, I/R and nephrotoxin injury models, histology, serum creatinine/BUN measurement, rhMG53 treatment\",\n      \"journal\": \"Science translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse phenotype, live imaging, recombinant protein rescue, multiple injury models\",\n      \"pmids\": [\"25787762\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MG53 interferes with TGF-β-dependent activation of myofibroblast differentiation during wound healing, down-regulating α-smooth muscle actin and extracellular matrix proteins, thereby reducing scarring. MG53-deficient mice show delayed wound healing, abnormal scarring, and collagen overproduction. MG53 also facilitates fibroblast migration in response to scratch wounding.\",\n      \"method\": \"MG53 KO mice, scratch wound assay, TGF-β stimulation with rhMG53 treatment, Western blotting for α-SMA and ECM proteins, rodent dermal injury models\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse, functional assays, TGF-β pathway readout; single lab\",\n      \"pmids\": [\"26306047\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MG53 transcriptional upregulation of peroxisome proliferator-activated receptor alpha (PPARα) and its target genes in cardiomyocytes leads to lipid accumulation and lipotoxicity. MG53 transgenic mice develop diabetic cardiomyopathy with insulin resistance, lipid accumulation, hypertrophy, and fibrosis via dual mechanisms: PPARα upregulation and destabilization of IR and IRS1.\",\n      \"method\": \"Cardiac-specific MG53 transgenic mice, echocardiography, lipid assays, Western blotting for IR/IRS1, PPARα target gene expression, histology\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transgenic mouse model, multiple metabolic/cardiac readouts, PPARα pathway analysis; single lab\",\n      \"pmids\": [\"25637627\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TRIM72 undergoes mono-ADP-ribosylation at arginine residues (R207, R260) by ADP-ribosyltransferase 1 (ART1), and this modification is reversed by ARH1. ADP-ribosylated TRIM72 levels are elevated in ARH1-deficient mice after I/R injury. Mutant TRIM72 (R207K/R260K) that cannot be ADP-ribosylated interferes with assembly of TRIM72 repair complexes at laser-induced injury sites, and mono-ADP-ribosylation inhibitors block TRIM72 oligomerization.\",\n      \"method\": \"ARH1-deficient mice, C2C12 knockdown/scratch assay, mutant TRIM72 live cell imaging, mono-ADP-ribosylation inhibitors (vitamin K1, novobiocin), Co-IP from heart lysates\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mice, site-directed mutants with imaging, pharmacological inhibitors; single lab study\",\n      \"pmids\": [\"30429362\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MG53 acts as a glucose-sensitive myokine/cardiokine secreted from striated muscle in response to high glucose or high insulin. Circulating MG53 binds the extracellular domain of the insulin receptor and acts as an allosteric blocker of insulin signaling. Neutralizing circulating MG53 with monoclonal antibodies has therapeutic effects in diabetic db/db mice.\",\n      \"method\": \"Perfused rodent heart/skeletal muscle, Co-immunoprecipitation and surface plasmon resonance for MG53-insulin receptor extracellular domain interaction, cardiac-specific MG53 transgenic mice, monoclonal antibody neutralization in db/db mice\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — surface plasmon resonance for direct binding measurement, Co-IP, in vivo genetic and antibody interventions; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"30586741\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MG53 modulates G3BP2 activity in non-small cell lung cancer through physical interaction via the TRIM domain of MG53, inducing nuclear translocation of G3BP2 and blocking stress granule formation. Loss of MG53 promotes lung cancer progression; MG53 anti-proliferative effects on NSCLC cells are abolished with G3BP2 knockout.\",\n      \"method\": \"Co-immunoprecipitation for MG53-G3BP2 interaction, shRNA knockdown, live cell imaging, xenograft and allograft tumor models, domain mapping\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain mapping, genetic KO rescue, in vivo tumor models; single lab\",\n      \"pmids\": [\"34521423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"High glucose represses AMPK signaling via MG53 E3-ubiquitin-ligase-mediated AMPKα ubiquitination and degradation. Specifically, high-glucose-stimulated ROS signals AKT to phosphorylate AMPKα at S485/491, which recruits MG53 and triggers ubiquitination and proteasomal degradation of AMPKα. High glucose also deactivates AMPK by ROS-dependent suppression of AMPKα T172 phosphorylation.\",\n      \"method\": \"In vitro ubiquitination assays, phosphomimetic AMPKα mutants, ROS manipulation, AKT inhibitors, MG53 knockdown/overexpression, co-immunoprecipitation\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro ubiquitination assay, phospho-site mutagenesis, multiple pathway inhibitors, Co-IP; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"33400924\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MG53 is expressed in human macrophages and suppresses type I interferon (IFNβ) production upon viral infection by inhibiting RyR-mediated intracellular calcium oscillation and subsequent NFκB signaling activation. MG53 knockdown in macrophages increases IFNβ upon infection; MG53 KO mice infected with influenza show elevated IFNβ and increased morbidity. MG53 inhibits IFNβ induction in an RyR-dependent manner.\",\n      \"method\": \"MG53 knockdown in macrophages, MG53 KO mouse infection model, calcium imaging, RyR inhibitor rescue, NFκB reporter assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse, RyR-dependency test, knockdown in primary cells; single lab\",\n      \"pmids\": [\"32681036\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Cardiac ischemic preconditioning promotes MG53 secretion through H2O2-evoked activation of protein kinase C-δ (PKC-δ). Specifically, IPC-induced myocardial MG53 secretion is mediated by H2O2-triggered phosphorylation of PKC-δ at Y311, which is necessary and sufficient to facilitate MG53 secretion from cardiomyocytes without causing membrane leakage.\",\n      \"method\": \"Proteomic analysis, pharmacological and genetic manipulation of PKC-δ, Y311 phospho-mutants, rodent in vivo and isolated perfused heart models, neonatal cardiomyocyte culture\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — site-specific phospho-mutants, genetic and pharmacological approaches, in vivo and in vitro validation, multiple orthogonal methods\",\n      \"pmids\": [\"32677469\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MG53 inhibits necroptosis by acting as an E3 ubiquitin ligase that adds ubiquitin chains to RIPK1 at residues K316, K604, and K627, promoting proteasome-mediated RIPK1 degradation. ROS generated during I/R injury promote interaction between MG53 and RIPK1. N-acetylcysteine disrupts the MG53-RIPK1 interaction and abolishes MG53-mediated cardioprotection.\",\n      \"method\": \"Co-immunoprecipitation, CRISPR/Cas9 and mutagenesis to identify ubiquitination sites, Western blotting, antioxidant treatment, hiPSC-derived cardiomyocyte H/R model, I/R mouse model\",\n      \"journal\": \"Frontiers in cardiovascular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — ubiquitination site mapping by mutagenesis, CRISPR KO, Co-IP, in vivo rescue; single lab\",\n      \"pmids\": [\"35711363\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MG53 interacts physically with the p65 subunit of NF-κB and can enter the nuclei of proximal tubular epithelial cells to directly suppress NF-κB activation, thereby reducing inflammation and kidney fibrosis.\",\n      \"method\": \"Co-IP of MG53 with p65, nuclear fractionation, MG53 KO and overexpression, unilateral ureteral obstruction model, histology for fibrosis\",\n      \"journal\": \"Kidney international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with p65, nuclear localization shown, KO mouse fibrosis model; single lab\",\n      \"pmids\": [\"34757120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MG53 interacts with NF-κB pathway components TAK1 and IκBα (by Co-IP) and regulates NF-κB activity, thereby controlling KChIP2 transcription (confirmed by ChIP showing NF-κB binding to KChIP2 gene 5' regulatory region) and the fast transient outward K+ current (Ito,f) in cardiomyocytes. MG53 knockout reduces KChIP2/Ito,f; MG53 overexpression increases it.\",\n      \"method\": \"Co-immunoprecipitation (MG53 with TAK1 and IκBα), chromatin immunoprecipitation for NF-κB at KChIP2 promoter, MG53 KO mice, adenoviral overexpression/knockdown, patch-clamp electrophysiology, pressure-overload cardiac hypertrophy model\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ChIP, electrophysiology with KO/OE; single lab\",\n      \"pmids\": [\"30760025\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"MG53 binds to cardiolipin (CL), a mitochondria-specific lipid, and translocates to mitochondria after ischemic injury. rhMG53 treatment reduces superoxide generation and inhibits mitophagy in cardiomyocytes, preserving mitochondrial integrity.\",\n      \"method\": \"Lipid-binding assay for cardiolipin, fluorescent imaging of MG53 localization to mitochondria in vivo/in vitro, mt-mKeima mitophagy reporter, superoxide detection\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct lipid-binding assay, imaging of translocation, functional mitophagy reporter; single lab\",\n      \"pmids\": [\"35679798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"MG53 phosphorylation at serine 255 (S255) by GSK3β is a prerequisite for MG53 E3 ligase activity. Elevated S255 phosphorylation in metabolic disorder models enhances E3 ligase activity, forming a vicious cycle with IR-IRS1-GSK3β-MG53. The S255A mutant eliminates E3 ligase activity while retaining cell-protective membrane repair function, providing cardioprotection in diabetic mice without adverse metabolic effects.\",\n      \"method\": \"Immunoprecipitation-mass spectrometry to identify phosphosite, in vitro kinase assay with GSK3β, S255A site-directed mutagenesis, knock-in mice, db/db diabetic mouse I/R model\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay, phosphosite mutagenesis, knock-in mouse validation, diabetic disease model; multiple orthogonal methods\",\n      \"pmids\": [\"36337049\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"MG53 binds to p53 and promotes its ubiquitination and proteasomal degradation, reducing apoptosis and elevating proliferation in trophoblasts. CVMSC-derived exosomes upregulate TRIM72/MG53 expression, which in turn degrades p53.\",\n      \"method\": \"Co-immunoprecipitation for TRIM72-p53 interaction, ubiquitination assay, luciferase reporter, Western blotting, mRNA sequencing\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ubiquitination assay, functional cell assays; single lab\",\n      \"pmids\": [\"34788479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"MG53 succinylation at K130 suppresses its ubiquitination at the same residue and stabilizes MG53 protein. SIRT7 inhibits and KAT3B promotes succinylation of MG53 at K130; SIRT7 aggravates and KAT3B alleviates MG53-mediated protection against hypoxia/reoxygenation-induced cardiomyocyte injury. The relationship between MG53 and KAT3B or SIRT7 was confirmed by co-IP.\",\n      \"method\": \"Co-immunoprecipitation for MG53-KAT3B and MG53-SIRT7 interactions, IP for succinylation and ubiquitination levels, site-specific mutagenesis at K130\",\n      \"journal\": \"Clinical and experimental hypertension\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, succinylation/ubiquitination assays at specific site; single lab\",\n      \"pmids\": [\"37848382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Complete crystal structure of Mus musculus TRIM72 (BCC-SPRY domains) reveals the molecular basis of TRIM72 oligomerization, which is closely linked to disulfide bond formation. Phosphatidylserine-enriched membrane interaction is necessary for oligomeric assembly and ubiquitination activity of TRIM72. Cryo-electron tomography and subtomogram averaging elucidated a higher-order TRIM72 assembly on the phospholipid bilayer. TRIM72 also interacts with several other negatively charged lipids beyond phosphatidylserine.\",\n      \"method\": \"Cryo-electron tomography and subtomogram averaging, crystal structure of BCC-SPRY domains, structure-guided mutagenesis, biochemical ubiquitination assays, lipid binding assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus cryo-ET, structure-guided mutagenesis with functional validation, in vitro ubiquitination assay; multiple orthogonal methods in one study\",\n      \"pmids\": [\"36944613\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Crystal structure of mouse TRIM72 (complete RING-B-box-coiled-coil-SPRY model) shows that phosphatidylserine-membrane interaction is necessary for oligomeric assembly and ubiquitination activity. Structure-function study on the membrane identifies key interdomain contacts for RING E3 ligase activation through higher-order assembly on membranes.\",\n      \"method\": \"Cryo-EM structure of full-length TRIM72, biochemical ubiquitination assays, phosphatidylserine binding assays, domain mutagenesis\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — near-complete structural model, in vitro ubiquitination reconstitution, membrane-binding mutagenesis; rigorous single-study with multiple orthogonal methods\",\n      \"pmids\": [\"37770719\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MG53 E3 ligase activity mediates K48-linked ubiquitination and proteasomal degradation of cyclin D1, causing G1 cell cycle arrest and suppression of cancer cell proliferation in colorectal and gastric cancer.\",\n      \"method\": \"In vitro ubiquitination assays, K48-linkage specific ubiquitin experiments, MG53 overexpression/knockdown in cancer cells, xenograft tumor models, AOM/DSS colorectal cancer model\",\n      \"journal\": \"Signal transduction and targeted therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — ubiquitination assay with linkage specificity, in vivo tumor models; single lab\",\n      \"pmids\": [\"37414783\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MG53 directly binds p53 tumor suppressor to regulate its ubiquitination and degradation via the RING E3 ligase domain, thereby preventing DOX-induced ferroptosis by maintaining SLC7A11 and GPX4 levels through the p53/SLC7A11/GPX4 pathway.\",\n      \"method\": \"Co-IP for MG53-p53 interaction, ubiquitination assay, MG53 overexpression and p53 knockdown in cardiomyocytes, in vivo DIC mouse model, cardiac function assessment\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ubiquitination assay, genetic KO/OE with functional ferroptosis readout; single lab\",\n      \"pmids\": [\"39111582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"p55γ recruits MG53 as the E3 ligase to mediate ubiquitin-dependent degradation of RIP3, thereby suppressing ischemia-induced myocardial necroptosis. p55γ directly binds and degrades RIP3 in an MG53-dependent manner; IPC-mediated suppression of necroptosis is attenuated in p55γ-deficient hearts.\",\n      \"method\": \"Co-IP and pulldown assays for p55γ-MG53-RIP3 complex, p55γ transgenic and KO mice, mass spectrometry, ChIP for Hif1α at p55γ promoter, in vivo LAD ligation I/R model\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, pulldown, KO/transgenic mice with functional readout; single lab\",\n      \"pmids\": [\"37527538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"MG53 catalyzes K48-linked polyubiquitination of RAC1 at Lys5 via its coiled-coil domain direct interaction with RAC1, suppressing RAC1 activity and the RAC1-MAPK signaling axis in hepatocellular carcinoma cells.\",\n      \"method\": \"Co-IP for MG53-RAC1 interaction, domain deletion mutants, in vitro ubiquitination assay, K48-specific ubiquitin chains, RAC1 activity assay, xenograft models\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro ubiquitination with linkage specificity, Co-IP with domain mapping; single lab\",\n      \"pmids\": [\"35858925\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TRIM72 interacts with and ubiquitinates MGMT (O6-methylguanine DNA methyl transferase) for proteasomal degradation. TRIM72 knockdown increases MGMT protein levels while reducing its ubiquitination; ectopic TRIM72 expression sensitizes uveal melanoma cells to dacarbazine treatment.\",\n      \"method\": \"Co-IP for TRIM72-MGMT interaction, ubiquitination assay, shRNA knockdown, overexpression in UM cells, Western blotting\",\n      \"journal\": \"Cancer biomarkers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ubiquitination assay, knockdown/overexpression with functional drug sensitivity readout; single lab\",\n      \"pmids\": [\"34958003\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TRIM72 physically interacts with complement receptor CRIg in alveolar macrophages (confirmed by pulldown, Co-IP, and gradient binding assays) and inhibits CRIg-mediated phagosome formation, suppressing complement receptor-mediated phagocytosis. Genetic ablation of TRIM72 leads to improved pathogen clearance, reduced cytokine storm, and improved survival in murine pneumonia models.\",\n      \"method\": \"Pulldown assay, Co-immunoprecipitation, gradient binding assay, TRIM72 KO mice, AM adoptive transfer, in vivo Pseudomonas aeruginosa pneumonia model\",\n      \"journal\": \"American journal of respiratory cell and molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple biochemical interaction assays, KO mouse with adoptive transfer confirmation, functional phagocytosis assay; single lab\",\n      \"pmids\": [\"29268030\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TRIM72 interacts with caveolin-1 (Cav1) in lung epithelial cells; deletion of any functional domain (RING, B-box, coiled-coil, or PRY-SPRY) abolishes the physical TRIM72-Cav1 interaction. TRIM72 loss reduces Cav1 at the plasma membrane and markedly attenuates caveolar endocytosis; TRIM72 overexpression selectively increases caveolar endocytosis. TRIM72 KO and Cav1 KO mice show increased lung cell death after injurious ventilation, with double KO being most severe.\",\n      \"method\": \"Co-immunoprecipitation with domain deletion mutants, caveolar endocytosis assays, lentiviral overexpression, TRIM72 KO and Cav1 KO mice, injurious ventilation model\",\n      \"journal\": \"American journal of physiology. Lung cellular and molecular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-deletion Co-IP, functional caveolar endocytosis assay, double KO epistasis; single lab\",\n      \"pmids\": [\"26637632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MG53 translocates to injury sites on renal proximal tubular cells and binds phosphatidylserine to protect against contrast-induced membrane injury. MG53 translocation from serum to injury sites was shown by immunoblot and immunohistochemical staining in vivo.\",\n      \"method\": \"In vivo rat CI-AKI model with immunoblot and IHC for MG53 translocation, rhMG53 treatment, phosphatidylserine binding confirmation in RPT cells\",\n      \"journal\": \"Acta pharmacologica Sinica\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — localization by IHC/immunoblot, single lab, mostly confirms earlier mechanism\",\n      \"pmids\": [\"32424239\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TRIM72 binds various lipids in vitro including phosphatidylserine, palmitate, and stearate with Kd values in the nanomolar to submicromolar range. TRIM72 can be dynamically converted by stimuli (fluorescence-quenching changes in conformation reduce lipid binding affinity), suggesting regulated lipid-binding during sarcolemmal repair.\",\n      \"method\": \"In vitro lipid binding assay with fluorescence measurements, Kd determination, time-resolved fluorescence\",\n      \"journal\": \"BMB reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — direct in vitro binding assay with quantitative Kd, but single lab, limited mechanistic follow-up\",\n      \"pmids\": [\"22281009\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TRIM72/MG53 is a muscle-enriched, redox-sensitive TRIM-family E3 ubiquitin ligase that (1) binds phosphatidylserine and cardiolipin on intracellular vesicles, undergoes oxidation- and Zn2+-dependent oligomerization via Cys242 and leucine-zipper motifs, and is recruited to membrane injury sites via cholesterol and PTRF/cavin-1 docking to nucleate a cell membrane repair patch in a cholesterol-dependent, Ca2+-facilitated process involving dysferlin, caveolin-3, and NM-IIA; (2) acts as an E3 ligase (with UBE2H as E2) to ubiquitinate and degrade multiple substrates including the insulin receptor, IRS-1, FAK, AMPKα, RIPK1, RIP3, cyclin D1, RAC1, p53, MGMT, and others, with E3 activity gated by GSK3β-mediated phosphorylation at Ser255 and by membrane-stimulated higher-order assembly; and (3) is secreted as a myokine/cardiokine via a PKC-δ-Y311-phosphorylation-dependent mechanism in response to oxidative stress or ischemic preconditioning, with circulating MG53 acting as an allosteric blocker of the insulin receptor extracellular domain and a multi-organ tissue-repair factor.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TRIM72 (MG53) is a muscle-enriched TRIM-family protein that nucleates the cell-membrane repair machinery at sites of sarcolemmal injury and doubles as a redox-regulated RING E3 ubiquitin ligase controlling metabolic and survival signaling [#0, #11]. In its repair role, MG53 associates with intracellular vesicles through binding to phosphatidylserine and other negatively charged lipids, and upon membrane wounding the resulting oxidative environment drives its oligomerization \\u2014 an obligatory step requiring Cys242 disulfide formation and the LZ1 leucine-zipper motif of the coiled-coil domain \\u2014 to translocate vesicles to the lesion [#0, #7]. Recruitment to the injury site is cholesterol-dependent and uses PTRF/cavin-1 as a docking protein, with Zn2+ binding to the RING and B-box motifs and the motor activity of nonmuscle myosin IIA required for assembly, while caveolin-3, dysferlin, and Ca2+-facilitated vesicle fusion complete the repair patch [#2, #4, #6, #9, #15]. Crystallographic and cryo-electron tomography analyses show that phosphatidylserine-membrane engagement licenses higher-order MG53 assembly on the bilayer, which in turn activates its RING-dependent ubiquitination activity [#32, #33]. As an E3 ligase acting with the E2 enzyme UBE2H, MG53 ubiquitinates and degrades the insulin receptor and IRS-1 to suppress insulin signaling and myogenesis, and its ligase activity is gated by GSK3\\u03b2-mediated phosphorylation at Ser255 [#11, #12, #29]. The same activity targets a broad substrate set including FAK, AMPK\\u03b1, RIPK1, and cyclin D1, linking MG53 to glucose handling, necroptosis suppression, and cell-cycle control [#13, #22, #25, #34]. MG53 is also secreted as a glucose-sensitive myokine/cardiokine through PKC-\\u03b4 Y311 phosphorylation, and circulating MG53 binds the insulin-receptor extracellular domain as an allosteric blocker, functioning as a multi-organ tissue-repair and metabolic factor [#20, #24]. Genetic ablation studies establish MG53 as essential for membrane resealing in skeletal and cardiac muscle and kidney, and for ischemic pre-/postconditioning cardioprotection via caveolin-3\\u2013PI3K tethering and the RISK pathway [#3, #8, #16].\",\n  \"teleology\": [\n    {\n      \"year\": 2008,\n      \"claim\": \"Established that MG53 is the nucleator of an acute cell-membrane repair response, answering how striated muscle reseals wounds and linking the process to vesicle lipid binding and oxidative triggering.\",\n      \"evidence\": \"Live imaging of GFP-MG53, lipid-binding assays, KO mice, and dye-entry repair assays in muscle fibers; plus imaging/knockdown showing vesicle budding and caveolin-3 interaction\",\n      \"pmids\": [\"19043407\", \"19029292\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of oxidation sensing not yet defined\", \"Composition of the repair patch beyond vesicle recruitment unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined the membrane-repair partner complex, showing MG53 traffics dysferlin and depends on caveolin-3 localization, explaining why Cav3 mutations cause defective repair.\",\n      \"evidence\": \"Reciprocal Co-IP, dominant-negative Cav3 mutants, live imaging with repair readouts in skeletal muscle\",\n      \"pmids\": [\"19380584\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and order of complex assembly unresolved\", \"Direct vs indirect MG53-dysferlin contact not fully mapped\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Extended MG53 function to the heart and to insulin signaling, establishing its role in ischemic preconditioning via caveolin-3/PI3K-RISK and as a negative regulator of IRS-1/myogenesis.\",\n      \"evidence\": \"KO mice with Langendorff perfusion, cholesterol depletion/repletion imaging, Co-IP, and IRS-1 raft-association/promoter analysis\",\n      \"pmids\": [\"20516375\", \"20466981\", \"20139895\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether IRS-1 regulation in 2010 was degradative was not yet defined\", \"Cholesterol-sensing receptor for MG53 not identified\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Dissected the molecular requirements for injury-site translocation \\u2014 a docking protein and the redox-dependent oligomerization chemistry \\u2014 and mapped domain-specific tethering of Cav3 and PI3K.\",\n      \"evidence\": \"PTRF knockdown/rescue imaging, LZ1/Cys242 mutagenesis with cross-linking and live imaging, and domain-deletion Co-IP with postconditioning assays\",\n      \"pmids\": [\"21343302\", \"21525429\", \"21285295\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How PTRF/cholesterol couples to oligomerization mechanistically unclear\", \"Reversibility of disulfide-driven assembly not addressed\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Resolved the cytoskeletal and Ca2+-dependent steps of repair and quantified MG53 lipid affinities, showing NM-IIA-driven vesicle transport and Ca2+-dependent dysferlin-dimer association.\",\n      \"evidence\": \"NM-IIA Co-IP/knockdown/rescue with imaging, dysferlin C2A-mutant pulldowns, and in vitro lipid-binding Kd measurements\",\n      \"pmids\": [\"22253476\", \"23145354\", \"22281009\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"PLoS Currents/BMB findings from single labs with limited follow-up\", \"Physiological lipid-conformation switching not validated in vivo\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identified MG53 as a bona fide E3 ubiquitin ligase, naming UBE2H as its E2 and IR, IRS-1, and FAK as degradation substrates, thereby mechanistically linking MG53 to insulin resistance and myogenesis.\",\n      \"evidence\": \"In vitro ubiquitination reconstitution, RING-domain mutagenesis, transgenic and KO mice with metabolic challenge, reciprocal Co-IP\",\n      \"pmids\": [\"23354051\", \"23965929\", \"24344130\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitin linkage type for IR/IRS1 not fully specified in these studies\", \"Trigger coupling membrane assembly to ligase activity not yet defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed that cysteine redox chemistry regulates MG53 stability, with S-nitrosylation at C144 protecting against oxidation-induced degradation and limiting I/R damage.\",\n      \"evidence\": \"C144S mutagenesis, GSNO/H2O2 treatment, and Langendorff I/R with infarct measurement\",\n      \"pmids\": [\"24487118\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous nitrosylation machinery not identified\", \"Interplay between C144 SNO and Cys242 oligomerization not resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined Zn2+ as a cofactor for repair assembly and extended MG53's repair/protective roles to kidney and dermal wound healing as a secreted/recombinant therapeutic.\",\n      \"evidence\": \"RING/B-box Zn-binding mutagenesis with chelation, KO mice in renal I/R and dermal injury models, rhMG53 treatment, TGF-\\u03b2 readouts\",\n      \"pmids\": [\"25869134\", \"25787762\", \"26306047\", \"25637627\", \"26637632\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of extracellular Zn2+ entry into the repair process unclear\", \"How secreted MG53 reaches distant injury sites not fully defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Established MG53 as a circulating myokine/cardiokine and an allosteric insulin-receptor blocker, providing a humoral mechanism for systemic insulin resistance distinct from intracellular degradation.\",\n      \"evidence\": \"Perfused muscle/heart, surface plasmon resonance and Co-IP for IR-ectodomain binding, transgenic mice, and neutralizing antibody therapy in db/db mice; plus G3BP2 stress-granule interaction in NSCLC\",\n      \"pmids\": [\"30586741\", \"34521423\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Secretion route of a transmembrane-less protein incompletely defined here\", \"Relative contribution of circulating vs intracellular MG53 to disease unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified the secretion trigger (PKC-\\u03b4 Y311 phosphorylation) and broadened MG53 ligase/regulatory functions to AMPK\\u03b1 degradation and innate-immune suppression.\",\n      \"evidence\": \"Y311 phospho-mutants and proteomics for secretion, in vitro ubiquitination with AMPK\\u03b1 phosphomimetics, and macrophage KO/RyR-dependency infection models\",\n      \"pmids\": [\"32677469\", \"33400924\", \"32681036\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Vesicular vs non-conventional secretion machinery not fully resolved\", \"Immune findings rest on single-lab models\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Pinpointed GSK3\\u03b2-Ser255 phosphorylation as the switch gating E3 ligase activity independently of membrane repair, and expanded substrate range to RIPK1/RIP3, cardiolipin-mediated mitochondrial targeting, and post-translational stabilizing modifications.\",\n      \"evidence\": \"IP-MS phosphosite mapping, GSK3\\u03b2 kinase assay, S255A knock-in mice in diabetic I/R; ubiquitination site mapping for RIPK1; cardiolipin binding and mitophagy reporters; K130 succinylation Co-IP\",\n      \"pmids\": [\"36337049\", \"35711363\", \"35679798\", \"37848382\", \"37527538\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Several substrate/modification studies are single-lab\", \"How Ser255 phosphorylation structurally activates the RING not defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Provided the structural basis for membrane-coupled activation, showing phosphatidylserine engagement licenses higher-order assembly that activates RING E3 activity, and consolidated MG53's tumor-suppressive substrate network.\",\n      \"evidence\": \"Crystal structures of BCC-SPRY and near-complete RBCC-SPRY, cryo-ET subtomogram averaging, structure-guided mutagenesis with in vitro ubiquitination; cyclin D1, p53, RAC1, MGMT degradation assays with tumor models\",\n      \"pmids\": [\"36944613\", \"37770719\", \"37414783\", \"34788479\", \"39111582\", \"35858925\", \"34958003\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cancer substrate findings largely single-lab\", \"Full-length apo vs membrane-bound conformational transition not captured at atomic resolution\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how the membrane-repair scaffold function and the substrate-selective E3 ligase function are coordinately controlled in vivo, and what governs the choice among MG53's many reported substrates in different tissues.\",\n      \"evidence\": \"No single study in the timeline integrates substrate selection, secretion, and repair within one regulatory framework\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unified model linking membrane assembly to substrate choice\", \"Tissue-specific substrate prioritization undefined\", \"In vivo relevance of many single-lab cancer substrates untested across labs\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [11, 12, 13, 22, 25, 34, 37]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [11, 12, 13, 22]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [0, 28, 42]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [20]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [2, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 2, 4]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [20, 24, 16]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [28]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [26]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [11, 12, 13]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [11, 12, 22, 34]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 8, 20]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [25, 35, 36]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [34]}\n    ],\n    \"complexes\": [\n      \"MG53-dysferlin-caveolin-3 membrane repair complex\",\n      \"MG53-UBE2H E2-E3 ubiquitination complex\"\n    ],\n    \"partners\": [\n      \"DYSF\",\n      \"CAV3\",\n      \"PTRF\",\n      \"UBE2H\",\n      \"MYH9\",\n      \"CAV1\",\n      \"G3BP2\",\n      \"RELA\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}