{"gene":"RNF128","run_date":"2026-06-10T06:43:37","timeline":{"discoveries":[{"year":2003,"finding":"GRAIL (RNF128) is a type I transmembrane E3 ubiquitin ligase that localizes to the endocytic pathway and limits activation-induced IL-2 and IL-4 cytokine production in T cells; both E3 ubiquitin ligase activity and intact endocytic trafficking are required for cytokine transcriptional regulation.","method":"In vitro ubiquitination assay, retroviral transduction of T cell hybridomas, cytokine production assays, subcellular localization studies","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro ubiquitination assay plus functional retroviral transduction experiments with defined cytokine readout; foundational paper replicated across many subsequent studies","pmids":["12705856"],"is_preprint":false},{"year":2003,"finding":"GRAIL is associated with and regulated by two isoforms of the deubiquitinase otubain 1: otubain 1 destabilizes GRAIL and promotes T cell proliferation and IL-2 production, whereas the alternatively spliced isoform otubain 1-ARF1 stabilizes GRAIL and maintains CD4 T cell anergy. These two proteins have opposing epistatic functions in controlling GRAIL stability.","method":"Retroviral transduction in bone marrow chimeric mice, flow cytometry for proliferation, IL-2 production assays, Western blot for GRAIL protein levels","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — epistatic in vivo reconstitution experiment with reciprocal functional readouts; replicated in multiple subsequent studies linking mTOR/Otubain-1/GRAIL axis","pmids":["14661020"],"is_preprint":false},{"year":2008,"finding":"GRAIL uses its luminal protease-associated (PA) domain to capture the extracellular/luminal portions of transmembrane substrates (tetraspanins CD151 and CD81), and its cytosolic RING finger domain then catalyzes K48-linked ubiquitination of cytosolic lysine residues on those substrates, promoting their proteasomal degradation and cell surface downregulation. GRAIL is identified as the first single-subunit E3 ligase with a membrane-separated substrate-binding domain and E2-recruitment domain.","method":"Yeast two-hybrid screen for PA domain interactors, co-immunoprecipitation, in vitro ubiquitination assay, flow cytometry for cell surface levels, proteasome inhibitor experiments","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of ubiquitination, yeast two-hybrid, co-IP, and functional surface downregulation assays in a single study","pmids":["18713730"],"is_preprint":false},{"year":2008,"finding":"GRAIL ubiquitinates the costimulatory molecule CD40L on CD4 T cells: using its luminal PA domain it binds the extracellular portion of CD40L, and its intracellular RING finger transfers ubiquitin to the small cytosolic tail of CD40L, leading to CD40L downregulation. Expression of GRAIL in bone marrow chimeric mice was associated with diminished lymphoid follicle formation.","method":"Co-immunoprecipitation, retroviral transduction, flow cytometry for CD40L surface expression, bone marrow chimera experiments","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP with functional in vivo consequence (lymphoid follicle formation); multiple orthogonal methods in single study","pmids":["18641297"],"is_preprint":false},{"year":2009,"finding":"GRAIL ubiquitinates and promotes proteasomal degradation of CD83 on CD4 T cells, dependent on an intact PA domain (extracellular) and active RING domain (cytosolic); ubiquitination of lysine residues K168 and K183 (but not K192) in the cytoplasmic domain of CD83 is required. GRAIL-mediated CD83 downregulation reduces a CD4 T cell costimulatory signal.","method":"Retroviral transduction, RNAi knockdown, site-directed mutagenesis of CD83 lysines, flow cytometry, co-immunoprecipitation, 26S proteasome inhibitor experiments","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis of specific ubiquitination sites combined with functional assays and co-IP in a single study","pmids":["19542455"],"is_preprint":false},{"year":2009,"finding":"Genetic deletion of Grail in mice leads to loss of T cell anergy, hyperactivation of primary CD4+ T cells (hyperproliferation, cytokine hypersecretion, costimulation-independent effector generation), and abrogation of oral tolerance; Grail-deficient T cells show elevated baseline ERK1/2 but unchanged ZAP70, PLCγ1, p38, or JNK levels.","method":"Grail knockout mouse generation, in vitro proliferation and cytokine assays, oral tolerance models (OT-II transgenic mice), experimental allergic encephalitis, Western blot for signaling molecules","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic KO with multiple orthogonal phenotypic readouts in vivo and in vitro","pmids":["19805371"],"is_preprint":false},{"year":2009,"finding":"GRAIL expression in naive CD4 T cells is maintained during quiescence; CD28 costimulation leads to IL-2 production, which activates the Akt-mTOR pathway, inducing selective translation of Otubain-1 mRNA, causing GRAIL degradation and allowing T cell proliferation. CTLA4-Ig, rapamycin, and anti-IL-2 all block mTOR, maintain GRAIL, and inhibit proliferation.","method":"In vitro T cell activation assays, rapamycin/CTLA4-Ig/anti-IL-2 treatment, Western blot for GRAIL and Otubain-1, proliferation assays","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — epistatic pathway defined by multiple pharmacological interventions with consistent mechanistic readouts across mouse and human CD4 T cells","pmids":["19414743"],"is_preprint":false},{"year":2010,"finding":"GRAIL mediates ubiquitination and degradation of TCR-CD3 complex components in naive and regulatory T cells; GRAIL-deficient T cells are less efficient at downregulating TCR-CD3 expression after activation and exhibit increased NFATc1 expression. GRAIL-deficient Treg cells show reduced suppressive function associated with increased Th17-related gene expression.","method":"GRAIL-deficient mouse analysis, autoimmune disease models, co-immunoprecipitation for CD3 ubiquitinylation, Western blot for NFATc1, flow cytometry, Treg suppression assays","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO combined with co-IP for substrate ubiquitination and multiple functional readouts in vivo","pmids":["20493730"],"is_preprint":false},{"year":2011,"finding":"GRAIL ubiquitinates Arp2/3 subunit 5 (Arp2/3-5) and coronin 1A via K48 and K63 linkages, leading to their degradation and impairing lamellipodium formation and F-actin accumulation at the immunological synapse in anergic T cells.","method":"In vitro ubiquitination assays, Western blot for substrate levels in anergic/GRAIL-overexpressing T cells, confocal microscopy for actin structures","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro ubiquitination assay plus functional imaging, single lab","pmids":["22016387"],"is_preprint":false},{"year":2013,"finding":"GRAIL physically interacts with the N-terminus of p53, targets it for ubiquitination and degradation, and modulates p53 transactivation activity through a negative feedback loop similar to Mdm2. Overexpression of GRAIL inhibits p53-induced apoptosis by increasing p53 degradation, whereas cells lacking GRAIL fail to undergo p53-dependent apoptosis and undergo p21-dependent G1 arrest instead.","method":"Co-immunoprecipitation, ubiquitination assay, overexpression/knockdown in cultured cells, apoptosis and cell cycle assays","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and ubiquitination assay with functional apoptosis readout, single lab with multiple methods","pmids":["23370271"],"is_preprint":false},{"year":2014,"finding":"Grail controls Th2 cell development by interacting with STAT6 and targeting it for ubiquitination and degradation; Grail deficiency increases STAT6 and IL-4 receptor α expression, leading to enhanced Th2 effector cytokine production and increased susceptibility to allergic asthma. STAT6 and GATA3 were found to bind the Grail promoter and transactivate it, forming a negative feedback loop.","method":"Co-immunoprecipitation, ubiquitination assay, Grail-deficient mice, in vitro Th2 differentiation, allergic asthma model, promoter binding assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP with ubiquitination, genetic KO with in vivo disease model, and promoter binding assays as multiple orthogonal methods","pmids":["25145352"],"is_preprint":false},{"year":2016,"finding":"RNF128 directly interacts with TBK1 through its protease-associated (PA) domain and catalyzes K63-linked polyubiquitination of TBK1, leading to TBK1 activation, IRF3 activation, and IFN-β production. RNF128 deficiency attenuates innate antiviral immune responses to RNA and DNA viruses in vitro and in vivo.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, RNF128-deficient cells and mice, viral infection models, IRF3 and IFN-β reporter assays","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro ubiquitination reconstitution, co-IP of interaction through defined domain, and in vivo genetic KO with antiviral readout","pmids":["27776110"],"is_preprint":false},{"year":2017,"finding":"Grail promotes IL-21 receptor (IL-21R) ubiquitination and degradation in CD8+ T cells; Grail deficiency increases IL-21R expression and enhances IL-21 signaling, conferring improved anti-tumor CD8+ T cell function and long-term tumor control.","method":"Co-immunoprecipitation, ubiquitination assay, Grail-deficient mice, transplanted lymphoma tumor models, therapeutic T cell transfer","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — ubiquitination assay plus genetic KO with in vivo tumor model and therapeutic transfer experiment","pmids":["28798332"],"is_preprint":false},{"year":2018,"finding":"Grail interacts with PPARγ, targeting it for ubiquitination and degradation, thereby regulating adipogenesis; both Grail knockdown and overexpression reduce PPARγ expression and inhibit adipogenesis. Grail KO mice have lower adipose mass and body weight and improved glucose and insulin tolerance on high-fat diet.","method":"Co-immunoprecipitation, ubiquitination assay, Grail KO mice, high-fat diet model, glucose/insulin tolerance tests, in vitro adipogenesis assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with ubiquitination and KO mouse phenotype, single lab","pmids":["29743578"],"is_preprint":false},{"year":2019,"finding":"RNF128 ubiquitinates CD44 and cortactin (CTTN), leading to their degradation; loss of RNF128 stabilizes CD44 and CTTN, activating Wnt/β-catenin signaling, increasing c-Myc and CD44 transcription, and promoting EMT and stemness in melanoma cells.","method":"Co-immunoprecipitation, ubiquitination assay, RNF128 knockdown/overexpression functional assays, Western blot","journal":"Journal of hematology & oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and ubiquitination assay with functional EMT readout, single lab","pmids":["30832692"],"is_preprint":false},{"year":2019,"finding":"RNF128 isoform 2 (Iso2) is a potent E3 ubiquitin ligase that degrades mutant p53; isoform 1 (Iso1) is heavily N-glycosylated with limited ligase activity, and it stabilizes mutant p53 (acting as a dominant negative-like form). In Barrett's esophagus progression to adenocarcinoma, Iso2 decreases while Iso1 increases. Iso2 is itself degraded via ATM/GSK3β-mediated phosphorylation and β-TrCP1-SCF ubiquitin ligase complex. Simvastatin degrades Iso1 and slows EAC xenograft growth.","method":"Co-immunoprecipitation, ubiquitination ligase assay, siRNA knockdown, isoform-specific expression constructs, xenograft mouse model, immunoblot for p53 and RNF128","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted ubiquitination assay with isoform mutagenesis, in vivo xenograft validation, and mechanistic degradation pathway elucidation in single study","pmids":["31715145"],"is_preprint":false},{"year":2019,"finding":"RNF128 promotes invasion and metastasis of esophageal squamous cell carcinoma (ESCC) through activation of the EGFR/MAPK/MMP-2 pathway; RNF128 interacts with p53, and p53 interacts with EGFR to activate this cascade. Inhibition of EGFR, MEK/ERK, or MMP-2 reverses RNF128-enhanced ESCC progression.","method":"Co-immunoprecipitation, transwell invasion assays, xenograft mouse model, Western blot, pathway inhibitor experiments","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP with functional assays and inhibitor experiments, single lab","pmids":["31216681"],"is_preprint":false},{"year":2020,"finding":"RNF128 promotes HCC progression by activating the EGFR/MEK/ERK signaling pathway; RNF128 overexpression enhances hepatoma cell proliferation, migration, invasion, and apoptotic resistance in vitro and in vivo, which is partially reversed by the EGFR inhibitor gefitinib.","method":"Knockdown and overexpression assays, xenograft mouse model, Western blot for pathway activation, EGFR inhibitor treatment","journal":"OncoTargets and therapy","confidence":"Low","confidence_rationale":"Tier 3 / Weak — functional overexpression/KD with pharmacological inhibitor, single lab, no direct substrate ubiquitination demonstrated","pmids":["33116595"],"is_preprint":false},{"year":2021,"finding":"Grail interacts with sirtuin 1 (Sirt1) and promotes hepatic lipid accumulation in NAFLD; Grail ablation alleviates high-fat diet-induced hepatic fat accumulation, while Grail overexpression exacerbates it.","method":"Co-immunoprecipitation, Grail KO mice on high-fat diet, in vitro lipid accumulation assays, gene expression analysis","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP interaction with genetic KO phenotype in vivo and in vitro, single lab","pmids":["33771967"],"is_preprint":false},{"year":2021,"finding":"RNF128 Iso2-UBCH5C (UBE2D3) complex is the p53-degrading E2-E3 pair in normal esophageal cells; during Barrett's progression, loss of UBE2D3 and rise of UBE2D1 (UBCH5A) paired with Iso1 forms an inactive E2-E3 complex that stabilizes mutant p53. Glycosylation of Iso1 at N48, N59, N101 blocks its ligase activity, and proline residues P54/P105 are required for p53 polyubiquitinating ability.","method":"Single-cell RNA sequencing, co-immunoprecipitation, ubiquitination assay, site-directed mutagenesis of Iso1 glycosylation and proline residues, clonogenic survival assays","journal":"Cellular and molecular gastroenterology and hepatology","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted ubiquitination assay with mutagenesis of specific residues plus functional clonogenic assays; mechanistically extends findings from PMID:31715145","pmids":["34416429"],"is_preprint":false},{"year":2021,"finding":"RNF128 regulates β-catenin ubiquitination and inhibits Wnt/β-catenin signaling in colorectal cancer cells, suppressing proliferation and metastasis.","method":"Co-immunoprecipitation, Western blot for β-catenin ubiquitination, RNF128 knockdown/overexpression functional assays","journal":"American journal of translational research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — co-IP with functional assays, single lab, limited mechanistic detail in abstract","pmids":["35035697"],"is_preprint":false},{"year":2023,"finding":"RNF128 binds myeloperoxidase (MPO) and reduces its levels and activity, inhibiting neutrophil activation; RNF128 also interacts with TLR4 in alveolar macrophages, targeting it for degradation and inhibiting NF-κB activation and pro-inflammatory cytokine production. RNF128 deficiency exacerbates LPS-induced acute lung injury, while AAV9-mediated RNF128 overexpression alleviates lung damage.","method":"Co-immunoprecipitation, RNF128-deficient mice, LPS-induced ALI model, AAV9 overexpression, MPO activity assay, NF-κB activation assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP of two distinct substrates with KO and overexpression in vivo, single lab","pmids":["37344492"],"is_preprint":false},{"year":2024,"finding":"RNF128 interacts with IL-6 receptor α subunit (IL-6Rα) and gp130, mediating their lysosomal degradation through K48-linked polyubiquitination; specific ubiquitination sites are K398/K401 on IL-6Rα and K718/K816/K866 on gp130. This inhibits IL-6-STAT3 signaling and attenuates colitis and colorectal tumorigenesis.","method":"Co-immunoprecipitation, site-directed mutagenesis of ubiquitination sites, ubiquitination assay, RNF128-deficient mouse models (DSS colitis, AOM/DSS CRC), in vitro proliferation assays, STAT3 activation assays","journal":"Journal of advanced research","confidence":"High","confidence_rationale":"Tier 1 / Strong — site-directed mutagenesis identifying specific ubiquitination lysines, co-IP, in vitro ubiquitination assay, and in vivo KO phenotype across multiple disease models","pmids":["38964734"],"is_preprint":false},{"year":2025,"finding":"RNF128 directly binds scavenger receptor B1 (SRB1) in macrophages and catalyzes K63-linked polyubiquitination at lysine K478 on SRB1's cytoplasmic C-terminus, preventing lysosomal degradation of SRB1 and promoting its Rab11-assisted endosome recycling to the cell membrane; this enhances oxLDL-induced foam cell formation and inflammatory response, aggravating atherosclerosis.","method":"Co-immunoprecipitation, ubiquitination assay with K63-linkage specificity, site-directed mutagenesis of K478, macrophage-specific RNF128 ablation in ApoE/LDLR-deficient mice, single-cell RNA sequencing, Rab11 interaction studies","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — site-directed mutagenesis identifying specific ubiquitination site, K63-linkage-specific ubiquitination assay, co-IP, and in vivo genetic KO in atherosclerosis mouse models","pmids":["40038329"],"is_preprint":false},{"year":2007,"finding":"GRAIL is expressed at ~10-fold higher mRNA levels in naturally occurring CD4+CD25+ T regulatory cells than in naive CD25- T cells; forced retroviral expression of GRAIL in a T cell line is sufficient to convert it to a regulatory phenotype in the absence of detectable Foxp3.","method":"Quantitative RT-PCR, flow cytometry, retroviral transduction with functional suppression assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — retroviral gain-of-function with functional suppression assay, single lab, replicated by later KO studies","pmids":["17259178"],"is_preprint":false}],"current_model":"RNF128 (GRAIL) is a type I transmembrane RING finger E3 ubiquitin ligase that uses its extracellular/luminal protease-associated (PA) domain to bind transmembrane substrates and its cytosolic RING domain to ubiquitinate them; it regulates T cell anergy, tolerance, and inflammatory signaling by ubiquitinating and degrading multiple substrates including TCR-CD3 components, CD40L, CD83, tetraspanins, STAT6, IL-21R, TBK1 (K63-linked, activating), Arp2/3-5, coronin 1A, p53 isoform-dependently, PPARγ, Sirt1, IL-6Rα/gp130 (K48-linked, degradative), and SRB1 (K63-linked, recycling-promoting), with its stability controlled by the mTOR-Otubain-1 axis downstream of IL-2 and CD28 costimulation."},"narrative":{"mechanistic_narrative":"RNF128 (GRAIL) is a type I transmembrane RING-finger E3 ubiquitin ligase that resides in the endocytic pathway and acts as a central negative regulator of T cell activation, immune tolerance, and inflammatory signaling [PMID:12705856, PMID:19805371]. Its defining architecture separates substrate recognition from catalysis: a luminal/extracellular protease-associated (PA) domain captures the ectodomains of transmembrane substrates while the cytosolic RING domain recruits E2 enzymes and transfers ubiquitin onto cytosolic lysines, the first single-subunit E3 described with such a membrane-separated arrangement [PMID:18713730]. Through this mechanism GRAIL downregulates a panel of T cell surface and signaling proteins—tetraspanins CD151/CD81 [PMID:18713730], the costimulatory ligand CD40L [PMID:18641297], CD83 [PMID:19542455], TCR-CD3 complex components [PMID:20493730], and IL-21R [PMID:28798332]—and degrades intracellular substrates including STAT6 to limit Th2 differentiation [PMID:25145352] and the actin regulators Arp2/3-5 and coronin 1A to restrain immunological-synapse formation in anergic T cells [PMID:22016387]. Genetic deletion in mice abolishes T cell anergy and oral tolerance and causes CD4 T cell hyperactivation, while GRAIL is required for normal regulatory T cell suppressive function [PMID:19805371, PMID:20493730]. GRAIL protein stability is set by an IL-2/CD28–Akt–mTOR axis that induces Otubain-1 translation to destabilize GRAIL during activation, with the otubain 1-ARF1 isoform conversely stabilizing it to maintain anergy [PMID:14661020, PMID:19414743]. Beyond degradative K48 ubiquitination, RNF128 also catalyzes activating K63-linked ubiquitination of TBK1 to drive IRF3-dependent IFN-β antiviral responses [PMID:27776110] and K63-linked ubiquitination of scavenger receptor SRB1 to promote its Rab11-dependent recycling in macrophages [PMID:40038329]. The same enzymatic logic operates outside immunity, where RNF128 ubiquitinates IL-6Rα and gp130 to suppress IL-6–STAT3 signaling and colitis-associated tumorigenesis [PMID:38964734], targets PPARγ and Sirt1 in adipogenesis and hepatic lipid metabolism [PMID:29743578, PMID:33771967], and degrades TLR4 and MPO to restrain lung inflammation [PMID:37344492]. In epithelial cancers, RNF128 controls p53 fate in an isoform-dependent manner: the active isoform 2, paired with the E2 UBE2D3, degrades mutant p53, whereas the N-glycosylated isoform 1 is catalytically impaired and stabilizes it, a switch that accompanies Barrett's esophagus progression to adenocarcinoma [PMID:23370271, PMID:31715145, PMID:34416429].","teleology":[{"year":2003,"claim":"Established RNF128/GRAIL as a transmembrane E3 ligase whose catalytic activity and endocytic trafficking are jointly required to restrain T cell cytokine production, defining its core role as a brake on T cell activation.","evidence":"In vitro ubiquitination plus retroviral transduction of T cell hybridomas with cytokine readouts; companion study defining Otubain-1 control of GRAIL stability","pmids":["12705856","14661020"],"confidence":"High","gaps":["Direct transmembrane substrates not yet identified at this stage","Mechanism linking endocytic trafficking to cytokine transcription unresolved"]},{"year":2007,"claim":"Linked GRAIL to the regulatory T cell program by showing its enrichment in Tregs and sufficiency to confer a suppressive phenotype, framing GRAIL as more than a generic activation brake.","evidence":"Quantitative RT-PCR and retroviral gain-of-function with functional suppression assay in a T cell line","pmids":["17259178"],"confidence":"Medium","gaps":["Foxp3-independent mechanism of suppression unexplained","Endogenous requirement not tested (gain-of-function only)"]},{"year":2008,"claim":"Resolved the biochemical logic of GRAIL by demonstrating that the luminal PA domain captures substrate ectodomains while the cytosolic RING catalyzes K48 ubiquitination, the first membrane-separated single-subunit E3 mechanism, and identified tetraspanins and CD40L as substrates.","evidence":"Yeast two-hybrid, co-IP, in vitro ubiquitination, and surface-downregulation flow cytometry","pmids":["18713730","18641297"],"confidence":"High","gaps":["Structural basis of PA-domain substrate selectivity not defined","Full substrate repertoire unknown"]},{"year":2009,"claim":"Genetic deletion proved GRAIL is required in vivo for T cell anergy and oral tolerance, and defined the IL-2/CD28-Akt-mTOR-Otubain-1 axis that times GRAIL degradation, while extending substrates to CD83.","evidence":"Grail knockout mice with proliferation, tolerance and autoimmunity models; pharmacological mTOR pathway dissection; CD83 lysine mutagenesis","pmids":["19805371","19414743","19542455"],"confidence":"High","gaps":["Mechanism connecting GRAIL loss to elevated baseline ERK1/2 not established","How mTOR selectively translates Otubain-1 mRNA unresolved"]},{"year":2010,"claim":"Identified the TCR-CD3 complex as a GRAIL substrate and tied GRAIL to Treg suppressive function, mechanistically connecting receptor downregulation to NFATc1 control and Th17 restraint.","evidence":"Co-IP for CD3 ubiquitination and GRAIL-deficient mouse autoimmune and Treg suppression assays","pmids":["20493730"],"confidence":"High","gaps":["Which CD3 chain lysines are modified not mapped","Causal link between TCR downregulation and Th17 program incomplete"]},{"year":2011,"claim":"Extended GRAIL's reach to the actin cytoskeleton by showing it ubiquitinates Arp2/3-5 and coronin 1A, explaining impaired immunological-synapse F-actin in anergic T cells.","evidence":"In vitro ubiquitination with K48/K63 linkage analysis and confocal imaging of actin structures","pmids":["22016387"],"confidence":"Medium","gaps":["How a transmembrane/endocytic E3 accesses cytosolic actin regulators not explained","Single-lab finding"]},{"year":2013,"claim":"Showed GRAIL targets p53 for degradation in a Mdm2-like negative feedback loop, opening a non-immune, tumor-relevant function in apoptosis and cell-cycle control.","evidence":"Co-IP, ubiquitination assay, and apoptosis/cell-cycle assays after overexpression and knockdown in cultured cells","pmids":["23370271"],"confidence":"Medium","gaps":["Isoform-dependence not yet appreciated here","Wild-type vs mutant p53 specificity unaddressed"]},{"year":2014,"claim":"Demonstrated GRAIL degrades STAT6 to control Th2 development, embedding GRAIL in a STAT6/GATA3 transcriptional feedback loop relevant to allergic asthma.","evidence":"Co-IP, ubiquitination, Grail-deficient mice, in vitro Th2 differentiation, asthma model, and promoter binding assays","pmids":["25145352"],"confidence":"High","gaps":["STAT6 ubiquitination sites not mapped","Cytosolic-substrate access mechanism unresolved"]},{"year":2016,"claim":"Revealed a non-degradative mode in which RNF128 catalyzes K63-linked ubiquitination of TBK1 to activate IRF3 and IFN-β, establishing RNF128 as a positive regulator of antiviral innate immunity.","evidence":"Co-IP through the PA domain, in vitro ubiquitination, and RNF128-deficient cells/mice in viral infection models","pmids":["27776110"],"confidence":"High","gaps":["How linkage specificity (K63 vs K48) is selected per substrate unknown","TBK1 ubiquitination sites not defined"]},{"year":2017,"claim":"Identified IL-21R as a GRAIL substrate in CD8+ T cells, showing GRAIL loss boosts IL-21 signaling and antitumor T cell function.","evidence":"Co-IP, ubiquitination assay, Grail-deficient mice, and transplantable lymphoma and adoptive-transfer therapy models","pmids":["28798332"],"confidence":"High","gaps":["IL-21R ubiquitination sites not mapped","Relative contribution among multiple T cell substrates unquantified"]},{"year":2018,"claim":"Expanded GRAIL function to metabolism by showing it degrades PPARγ to regulate adipogenesis and body weight, indicating roles beyond immune cells.","evidence":"Co-IP, ubiquitination assay, Grail KO mice on high-fat diet with glucose/insulin tolerance and in vitro adipogenesis assays","pmids":["29743578"],"confidence":"Medium","gaps":["Paradoxical reduction of PPARγ by both knockdown and overexpression unexplained","Single lab"]},{"year":2019,"claim":"Resolved the p53 link mechanistically as isoform-dependent: catalytically active isoform 2 degrades mutant p53 while N-glycosylated isoform 1 stabilizes it, a switch tracking Barrett's progression and additional cancer-promoting substrates (CD44, cortactin) and EGFR/MAPK signaling.","evidence":"Isoform-specific constructs, ubiquitination assays, glycosylation/proline mutagenesis, xenografts, and co-IP across esophageal and melanoma models","pmids":["31715145","30832692","31216681"],"confidence":"High","gaps":["Tissue-specific regulation of isoform balance incompletely defined","Reconciliation of tumor-suppressive vs tumor-promoting roles across cancers unresolved"]},{"year":2021,"claim":"Defined the E2-E3 pairing controlling p53 fate (Iso2-UBE2D3 active vs Iso1-UBE2D1 inactive) and broadened substrates to Sirt1 in hepatic lipid metabolism and β-catenin in colorectal cancer.","evidence":"Single-cell RNA-seq, co-IP, ubiquitination with residue mutagenesis, clonogenic assays, and Grail KO/overexpression metabolic and cancer models","pmids":["34416429","33771967","35035697"],"confidence":"High","gaps":["Why E2 partner switching occurs during disease progression unknown","β-catenin regulation supported only by limited mechanistic detail"]},{"year":2024,"claim":"Mapped specific degradative ubiquitination of IL-6Rα and gp130 with defined lysines, showing RNF128 suppresses IL-6-STAT3 signaling, colitis, and colorectal tumorigenesis.","evidence":"Co-IP, site-directed lysine mutagenesis, ubiquitination assay, and RNF128-deficient DSS colitis and AOM/DSS CRC models","pmids":["38964734"],"confidence":"High","gaps":["Whether IL-6Rα/gp130 are captured via the PA domain not directly tested","Crosstalk with the EGFR/MAPK cancer-promoting axis unresolved"]},{"year":2025,"claim":"Established a recycling-promoting K63 function in macrophages, where RNF128 ubiquitinates SRB1 at K478 to block lysosomal degradation and drive Rab11 endosome recycling, aggravating atherosclerosis.","evidence":"Co-IP, K63-linkage-specific ubiquitination, K478 mutagenesis, macrophage-specific KO in ApoE/LDLR-deficient mice, and scRNA-seq","pmids":["40038329"],"confidence":"High","gaps":["Determinants selecting K63-recycling vs K48-degradative outcomes per substrate unknown","Generalizability of recycling function to other receptors untested"]},{"year":null,"claim":"It remains unresolved what governs RNF128's choice of ubiquitin linkage type and substrate fate (degradation, recycling, or activation) across its diverse substrate panel, and how a transmembrane endocytic ligase engages cytosolic substrates such as p53, STAT6, and actin regulators.","evidence":"No timeline study reconciles linkage-type selection or cytosolic-substrate access mechanistically","pmids":[],"confidence":"Low","gaps":["No unifying structural model of PA-domain vs cytosolic substrate engagement","Linkage-determining cofactors/E2 selection rules undefined","Context determining tumor-suppressive vs tumor-promoting output unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[0,2,11,22,23]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[2,4,7,11,22,23]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[3,7,12,22]}],"localization":[{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[0,23]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[2,3,7,23]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,5,7,11,22]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[2,4,22,23]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[11,22,10]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[15,19,22,23]}],"complexes":[],"partners":["TBK1","STAT6","CD40L","CD83","IL21R","IL6R","TP53","SCARB1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8TEB7","full_name":"E3 ubiquitin-protein ligase RNF128","aliases":["Gene related to anergy in lymphocytes protein","GRAIL","RING finger protein 128","RING-type E3 ubiquitin transferase RNF128"],"length_aa":428,"mass_kda":46.5,"function":"E3 ubiquitin-protein ligase that catalyzes 'Lys-27', 'Lys-48'- or 'Lys-63'-linked polyubiquitin chains formation and plays a role in different biological processes such as modulation of immune response, cytoskeletal dynamics or protein homeostasis. Inhibits IL2 and IL4 transcription, thereby playing an important role in the induction of the anergic phenotype, a long-term stable state of T-lymphocyte unresponsiveness to antigenic stimulation associated with the blockade of interleukin production (PubMed:12705856). Ubiquitinates ARPC5 with 'Lys-48' linkages and COR1A with 'Lys-63' linkages leading to their degradation, down-regulation of these cytoskeletal components results in impaired lamellipodium formation and reduced accumulation of F-actin at the immunological synapse (PubMed:22016387). Functions in the patterning of the dorsal ectoderm; sensitizes ectoderm to respond to neural-inducing signals. Plays a positive role in innate immune response by promoting 'Lys-63'-linked ubiquitination of TBK1 after RNA- or DNA-virus infection (PubMed:27776110). 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Diagnostics 2021, 11, 2171\".","date":"2022","source":"Diagnostics (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/35626399","citation_count":20,"is_preprint":false},{"pmid":"22016387","id":"PMC_22016387","title":"GRAIL (gene related to anergy in lymphocytes) regulates cytoskeletal reorganization through ubiquitination and degradation of Arp2/3 subunit 5 and coronin 1A.","date":"2011","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/22016387","citation_count":19,"is_preprint":false},{"pmid":"16549277","id":"PMC_16549277","title":"h-Goliath, paralog of GRAIL, is a new E3 ligase protein, expressed in human leukocytes.","date":"2006","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/16549277","citation_count":19,"is_preprint":false},{"pmid":"37457748","id":"PMC_37457748","title":"The quest for the holy grail: overcoming challenges in expanding human hematopoietic stem cells for clinical use.","date":"2023","source":"Stem cell investigation","url":"https://pubmed.ncbi.nlm.nih.gov/37457748","citation_count":18,"is_preprint":false},{"pmid":"34235638","id":"PMC_34235638","title":"Gene Editing and Modulation: the Holy Grail for the Genetic Epilepsies?","date":"2021","source":"Neurotherapeutics : the journal of the American Society for Experimental NeuroTherapeutics","url":"https://pubmed.ncbi.nlm.nih.gov/34235638","citation_count":17,"is_preprint":false},{"pmid":"29743578","id":"PMC_29743578","title":"Grail is involved in adipocyte differentiation and diet-induced obesity.","date":"2018","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/29743578","citation_count":17,"is_preprint":false},{"pmid":"31208845","id":"PMC_31208845","title":"Is the pre-antral ovarian follicle the 'holy grail'for female fertility preservation?","date":"2019","source":"Animal reproduction science","url":"https://pubmed.ncbi.nlm.nih.gov/31208845","citation_count":17,"is_preprint":false},{"pmid":"24437630","id":"PMC_24437630","title":"Template CoMFA: the 3D-QSAR Grail?","date":"2014","source":"Journal of chemical information and modeling","url":"https://pubmed.ncbi.nlm.nih.gov/24437630","citation_count":17,"is_preprint":false},{"pmid":"36503162","id":"PMC_36503162","title":"circPHF16 suppresses prostate cancer metastasis via modulating miR-581/RNF128/Wnt/β-catenin pathway.","date":"2022","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/36503162","citation_count":15,"is_preprint":false},{"pmid":"18991611","id":"PMC_18991611","title":"Plasmodium falciparum serine/threonine phoshoprotein phosphatases (PPP): from housekeeper to the 'holy grail'.","date":"2008","source":"Current drug targets","url":"https://pubmed.ncbi.nlm.nih.gov/18991611","citation_count":15,"is_preprint":false},{"pmid":"18096086","id":"PMC_18096086","title":"The quest for the Holy Grail: a disease-modifying osteoarthritis drug.","date":"2007","source":"Arthritis research & therapy","url":"https://pubmed.ncbi.nlm.nih.gov/18096086","citation_count":14,"is_preprint":false},{"pmid":"30960257","id":"PMC_30960257","title":"Transparent to Black Electrochromism-The \"Holy Grail\" of Organic Optoelectronics.","date":"2019","source":"Polymers","url":"https://pubmed.ncbi.nlm.nih.gov/30960257","citation_count":14,"is_preprint":false},{"pmid":"27313072","id":"PMC_27313072","title":"Is Transforming Stem Cells to Pancreatic Beta Cells Still the Holy Grail for Type 2 Diabetes?","date":"2016","source":"Current diabetes reports","url":"https://pubmed.ncbi.nlm.nih.gov/27313072","citation_count":14,"is_preprint":false},{"pmid":"29922742","id":"PMC_29922742","title":"Biased agonism: the quest for the analgesic holy grail.","date":"2018","source":"Pain reports","url":"https://pubmed.ncbi.nlm.nih.gov/29922742","citation_count":14,"is_preprint":false},{"pmid":"37745257","id":"PMC_37745257","title":"Biomarkers in sepsis-looking for the Holy Grail or chasing a mirage!","date":"2023","source":"World journal of critical care medicine","url":"https://pubmed.ncbi.nlm.nih.gov/37745257","citation_count":13,"is_preprint":false},{"pmid":"31893469","id":"PMC_31893469","title":"Differentiating keratoacanthoma from squamous cell carcinoma-In quest of the holy grail.","date":"2020","source":"Journal of cutaneous pathology","url":"https://pubmed.ncbi.nlm.nih.gov/31893469","citation_count":13,"is_preprint":false},{"pmid":"27215557","id":"PMC_27215557","title":"Klotho, the Holy Grail of the kidney: from salt sensitivity to chronic kidney disease.","date":"2016","source":"International urology and nephrology","url":"https://pubmed.ncbi.nlm.nih.gov/27215557","citation_count":13,"is_preprint":false},{"pmid":"18467499","id":"PMC_18467499","title":"Upregulation of GRAIL is associated with remission of ulcerative colitis.","date":"2008","source":"American journal of physiology. Gastrointestinal and liver physiology","url":"https://pubmed.ncbi.nlm.nih.gov/18467499","citation_count":13,"is_preprint":false},{"pmid":"36516055","id":"PMC_36516055","title":"Lipid droplets, the Holy Grail of hepatic stellate cells: In health and hepatic fibrosis.","date":"2022","source":"Anatomical record (Hoboken, N.J. : 2007)","url":"https://pubmed.ncbi.nlm.nih.gov/36516055","citation_count":13,"is_preprint":false},{"pmid":"22986552","id":"PMC_22986552","title":"Searching for the Holy Grail; protein-protein interaction analysis and modulation.","date":"2012","source":"EMBO reports","url":"https://pubmed.ncbi.nlm.nih.gov/22986552","citation_count":13,"is_preprint":false},{"pmid":"21505031","id":"PMC_21505031","title":"VIZ-GRAIL: visualizing functional connections across disease loci.","date":"2011","source":"Bioinformatics (Oxford, England)","url":"https://pubmed.ncbi.nlm.nih.gov/21505031","citation_count":13,"is_preprint":false},{"pmid":"19621007","id":"PMC_19621007","title":"A Holy Grail of clinical pharmacology: prediction of drug pharmacokinetics and pharmacodynamics in the individual patient.","date":"2009","source":"Clinical pharmacology and therapeutics","url":"https://pubmed.ncbi.nlm.nih.gov/19621007","citation_count":13,"is_preprint":false},{"pmid":"40038329","id":"PMC_40038329","title":"E3 ubiquitin ligase RNF128 promotes Lys63-linked polyubiquitination on SRB1 in macrophages and aggravates atherosclerosis.","date":"2025","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/40038329","citation_count":12,"is_preprint":false},{"pmid":"35035697","id":"PMC_35035697","title":"RNF128 suppresses the malignancy of colorectal cancer cells via inhibition of Wnt/β-catenin signaling.","date":"2021","source":"American journal of translational research","url":"https://pubmed.ncbi.nlm.nih.gov/35035697","citation_count":12,"is_preprint":false},{"pmid":"30075621","id":"PMC_30075621","title":"GRAIL: GRids of phArmacophore Interaction fieLds.","date":"2018","source":"Journal of chemical theory and computation","url":"https://pubmed.ncbi.nlm.nih.gov/30075621","citation_count":12,"is_preprint":false},{"pmid":"21126558","id":"PMC_21126558","title":"A novel GRAIL E3 ubiquitin ligase promotes environmental salinity tolerance in euryhaline tilapia.","date":"2010","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/21126558","citation_count":12,"is_preprint":false},{"pmid":"35626398","id":"PMC_35626398","title":"The Promise of Multicancer Early Detection. Comment on Pons-Belda et al. Can Circulating Tumor DNA Support a Successful Screening Test for Early Cancer Detection? The Grail Paradigm. Diagnostics 2021, 11, 2171.","date":"2022","source":"Diagnostics (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/35626398","citation_count":12,"is_preprint":false},{"pmid":"34416429","id":"PMC_34416429","title":"UBCH5 Family Members Differentially Impact Stabilization of Mutant p53 via RNF128 Iso1 During Barrett's Progression to Esophageal Adenocarcinoma.","date":"2021","source":"Cellular and molecular gastroenterology and hepatology","url":"https://pubmed.ncbi.nlm.nih.gov/34416429","citation_count":11,"is_preprint":false},{"pmid":"38755467","id":"PMC_38755467","title":"Quantification of healthspan in aging mice: introducing FAMY and GRAIL.","date":"2024","source":"GeroScience","url":"https://pubmed.ncbi.nlm.nih.gov/38755467","citation_count":11,"is_preprint":false},{"pmid":"29101996","id":"PMC_29101996","title":"Introduction: Biomarkers of embryo viability: the search for the \"holy grail\" of embryo selection.","date":"2017","source":"Fertility and sterility","url":"https://pubmed.ncbi.nlm.nih.gov/29101996","citation_count":11,"is_preprint":false},{"pmid":"38964734","id":"PMC_38964734","title":"E3 ubiquitin ligase RNF128 attenuates colitis and colorectal tumorigenesis by triggering the degradation of IL-6 receptors.","date":"2024","source":"Journal of advanced research","url":"https://pubmed.ncbi.nlm.nih.gov/38964734","citation_count":10,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":41159,"output_tokens":6620,"usd":0.111389,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":15469,"output_tokens":5444,"usd":0.106722,"stage2_stop_reason":"end_turn"},"total_usd":0.218111,"stage1_batch_id":"msgbatch_01CNoDbkChHEkgrJnL7BwtGJ","stage2_batch_id":"msgbatch_016Y4x9E9Wg5VQDANj9quSQD","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2003,\n      \"finding\": \"GRAIL (RNF128) is a type I transmembrane E3 ubiquitin ligase that localizes to the endocytic pathway and limits activation-induced IL-2 and IL-4 cytokine production in T cells; both E3 ubiquitin ligase activity and intact endocytic trafficking are required for cytokine transcriptional regulation.\",\n      \"method\": \"In vitro ubiquitination assay, retroviral transduction of T cell hybridomas, cytokine production assays, subcellular localization studies\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vitro ubiquitination assay plus functional retroviral transduction experiments with defined cytokine readout; foundational paper replicated across many subsequent studies\",\n      \"pmids\": [\"12705856\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"GRAIL is associated with and regulated by two isoforms of the deubiquitinase otubain 1: otubain 1 destabilizes GRAIL and promotes T cell proliferation and IL-2 production, whereas the alternatively spliced isoform otubain 1-ARF1 stabilizes GRAIL and maintains CD4 T cell anergy. These two proteins have opposing epistatic functions in controlling GRAIL stability.\",\n      \"method\": \"Retroviral transduction in bone marrow chimeric mice, flow cytometry for proliferation, IL-2 production assays, Western blot for GRAIL protein levels\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — epistatic in vivo reconstitution experiment with reciprocal functional readouts; replicated in multiple subsequent studies linking mTOR/Otubain-1/GRAIL axis\",\n      \"pmids\": [\"14661020\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"GRAIL uses its luminal protease-associated (PA) domain to capture the extracellular/luminal portions of transmembrane substrates (tetraspanins CD151 and CD81), and its cytosolic RING finger domain then catalyzes K48-linked ubiquitination of cytosolic lysine residues on those substrates, promoting their proteasomal degradation and cell surface downregulation. GRAIL is identified as the first single-subunit E3 ligase with a membrane-separated substrate-binding domain and E2-recruitment domain.\",\n      \"method\": \"Yeast two-hybrid screen for PA domain interactors, co-immunoprecipitation, in vitro ubiquitination assay, flow cytometry for cell surface levels, proteasome inhibitor experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of ubiquitination, yeast two-hybrid, co-IP, and functional surface downregulation assays in a single study\",\n      \"pmids\": [\"18713730\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"GRAIL ubiquitinates the costimulatory molecule CD40L on CD4 T cells: using its luminal PA domain it binds the extracellular portion of CD40L, and its intracellular RING finger transfers ubiquitin to the small cytosolic tail of CD40L, leading to CD40L downregulation. Expression of GRAIL in bone marrow chimeric mice was associated with diminished lymphoid follicle formation.\",\n      \"method\": \"Co-immunoprecipitation, retroviral transduction, flow cytometry for CD40L surface expression, bone marrow chimera experiments\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP with functional in vivo consequence (lymphoid follicle formation); multiple orthogonal methods in single study\",\n      \"pmids\": [\"18641297\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"GRAIL ubiquitinates and promotes proteasomal degradation of CD83 on CD4 T cells, dependent on an intact PA domain (extracellular) and active RING domain (cytosolic); ubiquitination of lysine residues K168 and K183 (but not K192) in the cytoplasmic domain of CD83 is required. GRAIL-mediated CD83 downregulation reduces a CD4 T cell costimulatory signal.\",\n      \"method\": \"Retroviral transduction, RNAi knockdown, site-directed mutagenesis of CD83 lysines, flow cytometry, co-immunoprecipitation, 26S proteasome inhibitor experiments\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis of specific ubiquitination sites combined with functional assays and co-IP in a single study\",\n      \"pmids\": [\"19542455\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Genetic deletion of Grail in mice leads to loss of T cell anergy, hyperactivation of primary CD4+ T cells (hyperproliferation, cytokine hypersecretion, costimulation-independent effector generation), and abrogation of oral tolerance; Grail-deficient T cells show elevated baseline ERK1/2 but unchanged ZAP70, PLCγ1, p38, or JNK levels.\",\n      \"method\": \"Grail knockout mouse generation, in vitro proliferation and cytokine assays, oral tolerance models (OT-II transgenic mice), experimental allergic encephalitis, Western blot for signaling molecules\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic KO with multiple orthogonal phenotypic readouts in vivo and in vitro\",\n      \"pmids\": [\"19805371\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"GRAIL expression in naive CD4 T cells is maintained during quiescence; CD28 costimulation leads to IL-2 production, which activates the Akt-mTOR pathway, inducing selective translation of Otubain-1 mRNA, causing GRAIL degradation and allowing T cell proliferation. CTLA4-Ig, rapamycin, and anti-IL-2 all block mTOR, maintain GRAIL, and inhibit proliferation.\",\n      \"method\": \"In vitro T cell activation assays, rapamycin/CTLA4-Ig/anti-IL-2 treatment, Western blot for GRAIL and Otubain-1, proliferation assays\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — epistatic pathway defined by multiple pharmacological interventions with consistent mechanistic readouts across mouse and human CD4 T cells\",\n      \"pmids\": [\"19414743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"GRAIL mediates ubiquitination and degradation of TCR-CD3 complex components in naive and regulatory T cells; GRAIL-deficient T cells are less efficient at downregulating TCR-CD3 expression after activation and exhibit increased NFATc1 expression. GRAIL-deficient Treg cells show reduced suppressive function associated with increased Th17-related gene expression.\",\n      \"method\": \"GRAIL-deficient mouse analysis, autoimmune disease models, co-immunoprecipitation for CD3 ubiquitinylation, Western blot for NFATc1, flow cytometry, Treg suppression assays\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO combined with co-IP for substrate ubiquitination and multiple functional readouts in vivo\",\n      \"pmids\": [\"20493730\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"GRAIL ubiquitinates Arp2/3 subunit 5 (Arp2/3-5) and coronin 1A via K48 and K63 linkages, leading to their degradation and impairing lamellipodium formation and F-actin accumulation at the immunological synapse in anergic T cells.\",\n      \"method\": \"In vitro ubiquitination assays, Western blot for substrate levels in anergic/GRAIL-overexpressing T cells, confocal microscopy for actin structures\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro ubiquitination assay plus functional imaging, single lab\",\n      \"pmids\": [\"22016387\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"GRAIL physically interacts with the N-terminus of p53, targets it for ubiquitination and degradation, and modulates p53 transactivation activity through a negative feedback loop similar to Mdm2. Overexpression of GRAIL inhibits p53-induced apoptosis by increasing p53 degradation, whereas cells lacking GRAIL fail to undergo p53-dependent apoptosis and undergo p21-dependent G1 arrest instead.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, overexpression/knockdown in cultured cells, apoptosis and cell cycle assays\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and ubiquitination assay with functional apoptosis readout, single lab with multiple methods\",\n      \"pmids\": [\"23370271\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Grail controls Th2 cell development by interacting with STAT6 and targeting it for ubiquitination and degradation; Grail deficiency increases STAT6 and IL-4 receptor α expression, leading to enhanced Th2 effector cytokine production and increased susceptibility to allergic asthma. STAT6 and GATA3 were found to bind the Grail promoter and transactivate it, forming a negative feedback loop.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, Grail-deficient mice, in vitro Th2 differentiation, allergic asthma model, promoter binding assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP with ubiquitination, genetic KO with in vivo disease model, and promoter binding assays as multiple orthogonal methods\",\n      \"pmids\": [\"25145352\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RNF128 directly interacts with TBK1 through its protease-associated (PA) domain and catalyzes K63-linked polyubiquitination of TBK1, leading to TBK1 activation, IRF3 activation, and IFN-β production. RNF128 deficiency attenuates innate antiviral immune responses to RNA and DNA viruses in vitro and in vivo.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, RNF128-deficient cells and mice, viral infection models, IRF3 and IFN-β reporter assays\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro ubiquitination reconstitution, co-IP of interaction through defined domain, and in vivo genetic KO with antiviral readout\",\n      \"pmids\": [\"27776110\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Grail promotes IL-21 receptor (IL-21R) ubiquitination and degradation in CD8+ T cells; Grail deficiency increases IL-21R expression and enhances IL-21 signaling, conferring improved anti-tumor CD8+ T cell function and long-term tumor control.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, Grail-deficient mice, transplanted lymphoma tumor models, therapeutic T cell transfer\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ubiquitination assay plus genetic KO with in vivo tumor model and therapeutic transfer experiment\",\n      \"pmids\": [\"28798332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Grail interacts with PPARγ, targeting it for ubiquitination and degradation, thereby regulating adipogenesis; both Grail knockdown and overexpression reduce PPARγ expression and inhibit adipogenesis. Grail KO mice have lower adipose mass and body weight and improved glucose and insulin tolerance on high-fat diet.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, Grail KO mice, high-fat diet model, glucose/insulin tolerance tests, in vitro adipogenesis assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with ubiquitination and KO mouse phenotype, single lab\",\n      \"pmids\": [\"29743578\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RNF128 ubiquitinates CD44 and cortactin (CTTN), leading to their degradation; loss of RNF128 stabilizes CD44 and CTTN, activating Wnt/β-catenin signaling, increasing c-Myc and CD44 transcription, and promoting EMT and stemness in melanoma cells.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, RNF128 knockdown/overexpression functional assays, Western blot\",\n      \"journal\": \"Journal of hematology & oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and ubiquitination assay with functional EMT readout, single lab\",\n      \"pmids\": [\"30832692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RNF128 isoform 2 (Iso2) is a potent E3 ubiquitin ligase that degrades mutant p53; isoform 1 (Iso1) is heavily N-glycosylated with limited ligase activity, and it stabilizes mutant p53 (acting as a dominant negative-like form). In Barrett's esophagus progression to adenocarcinoma, Iso2 decreases while Iso1 increases. Iso2 is itself degraded via ATM/GSK3β-mediated phosphorylation and β-TrCP1-SCF ubiquitin ligase complex. Simvastatin degrades Iso1 and slows EAC xenograft growth.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination ligase assay, siRNA knockdown, isoform-specific expression constructs, xenograft mouse model, immunoblot for p53 and RNF128\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted ubiquitination assay with isoform mutagenesis, in vivo xenograft validation, and mechanistic degradation pathway elucidation in single study\",\n      \"pmids\": [\"31715145\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RNF128 promotes invasion and metastasis of esophageal squamous cell carcinoma (ESCC) through activation of the EGFR/MAPK/MMP-2 pathway; RNF128 interacts with p53, and p53 interacts with EGFR to activate this cascade. Inhibition of EGFR, MEK/ERK, or MMP-2 reverses RNF128-enhanced ESCC progression.\",\n      \"method\": \"Co-immunoprecipitation, transwell invasion assays, xenograft mouse model, Western blot, pathway inhibitor experiments\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP with functional assays and inhibitor experiments, single lab\",\n      \"pmids\": [\"31216681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RNF128 promotes HCC progression by activating the EGFR/MEK/ERK signaling pathway; RNF128 overexpression enhances hepatoma cell proliferation, migration, invasion, and apoptotic resistance in vitro and in vivo, which is partially reversed by the EGFR inhibitor gefitinib.\",\n      \"method\": \"Knockdown and overexpression assays, xenograft mouse model, Western blot for pathway activation, EGFR inhibitor treatment\",\n      \"journal\": \"OncoTargets and therapy\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — functional overexpression/KD with pharmacological inhibitor, single lab, no direct substrate ubiquitination demonstrated\",\n      \"pmids\": [\"33116595\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Grail interacts with sirtuin 1 (Sirt1) and promotes hepatic lipid accumulation in NAFLD; Grail ablation alleviates high-fat diet-induced hepatic fat accumulation, while Grail overexpression exacerbates it.\",\n      \"method\": \"Co-immunoprecipitation, Grail KO mice on high-fat diet, in vitro lipid accumulation assays, gene expression analysis\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP interaction with genetic KO phenotype in vivo and in vitro, single lab\",\n      \"pmids\": [\"33771967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RNF128 Iso2-UBCH5C (UBE2D3) complex is the p53-degrading E2-E3 pair in normal esophageal cells; during Barrett's progression, loss of UBE2D3 and rise of UBE2D1 (UBCH5A) paired with Iso1 forms an inactive E2-E3 complex that stabilizes mutant p53. Glycosylation of Iso1 at N48, N59, N101 blocks its ligase activity, and proline residues P54/P105 are required for p53 polyubiquitinating ability.\",\n      \"method\": \"Single-cell RNA sequencing, co-immunoprecipitation, ubiquitination assay, site-directed mutagenesis of Iso1 glycosylation and proline residues, clonogenic survival assays\",\n      \"journal\": \"Cellular and molecular gastroenterology and hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted ubiquitination assay with mutagenesis of specific residues plus functional clonogenic assays; mechanistically extends findings from PMID:31715145\",\n      \"pmids\": [\"34416429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RNF128 regulates β-catenin ubiquitination and inhibits Wnt/β-catenin signaling in colorectal cancer cells, suppressing proliferation and metastasis.\",\n      \"method\": \"Co-immunoprecipitation, Western blot for β-catenin ubiquitination, RNF128 knockdown/overexpression functional assays\",\n      \"journal\": \"American journal of translational research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — co-IP with functional assays, single lab, limited mechanistic detail in abstract\",\n      \"pmids\": [\"35035697\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"RNF128 binds myeloperoxidase (MPO) and reduces its levels and activity, inhibiting neutrophil activation; RNF128 also interacts with TLR4 in alveolar macrophages, targeting it for degradation and inhibiting NF-κB activation and pro-inflammatory cytokine production. RNF128 deficiency exacerbates LPS-induced acute lung injury, while AAV9-mediated RNF128 overexpression alleviates lung damage.\",\n      \"method\": \"Co-immunoprecipitation, RNF128-deficient mice, LPS-induced ALI model, AAV9 overexpression, MPO activity assay, NF-κB activation assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP of two distinct substrates with KO and overexpression in vivo, single lab\",\n      \"pmids\": [\"37344492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RNF128 interacts with IL-6 receptor α subunit (IL-6Rα) and gp130, mediating their lysosomal degradation through K48-linked polyubiquitination; specific ubiquitination sites are K398/K401 on IL-6Rα and K718/K816/K866 on gp130. This inhibits IL-6-STAT3 signaling and attenuates colitis and colorectal tumorigenesis.\",\n      \"method\": \"Co-immunoprecipitation, site-directed mutagenesis of ubiquitination sites, ubiquitination assay, RNF128-deficient mouse models (DSS colitis, AOM/DSS CRC), in vitro proliferation assays, STAT3 activation assays\",\n      \"journal\": \"Journal of advanced research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — site-directed mutagenesis identifying specific ubiquitination lysines, co-IP, in vitro ubiquitination assay, and in vivo KO phenotype across multiple disease models\",\n      \"pmids\": [\"38964734\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RNF128 directly binds scavenger receptor B1 (SRB1) in macrophages and catalyzes K63-linked polyubiquitination at lysine K478 on SRB1's cytoplasmic C-terminus, preventing lysosomal degradation of SRB1 and promoting its Rab11-assisted endosome recycling to the cell membrane; this enhances oxLDL-induced foam cell formation and inflammatory response, aggravating atherosclerosis.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay with K63-linkage specificity, site-directed mutagenesis of K478, macrophage-specific RNF128 ablation in ApoE/LDLR-deficient mice, single-cell RNA sequencing, Rab11 interaction studies\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — site-directed mutagenesis identifying specific ubiquitination site, K63-linkage-specific ubiquitination assay, co-IP, and in vivo genetic KO in atherosclerosis mouse models\",\n      \"pmids\": [\"40038329\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"GRAIL is expressed at ~10-fold higher mRNA levels in naturally occurring CD4+CD25+ T regulatory cells than in naive CD25- T cells; forced retroviral expression of GRAIL in a T cell line is sufficient to convert it to a regulatory phenotype in the absence of detectable Foxp3.\",\n      \"method\": \"Quantitative RT-PCR, flow cytometry, retroviral transduction with functional suppression assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — retroviral gain-of-function with functional suppression assay, single lab, replicated by later KO studies\",\n      \"pmids\": [\"17259178\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RNF128 (GRAIL) is a type I transmembrane RING finger E3 ubiquitin ligase that uses its extracellular/luminal protease-associated (PA) domain to bind transmembrane substrates and its cytosolic RING domain to ubiquitinate them; it regulates T cell anergy, tolerance, and inflammatory signaling by ubiquitinating and degrading multiple substrates including TCR-CD3 components, CD40L, CD83, tetraspanins, STAT6, IL-21R, TBK1 (K63-linked, activating), Arp2/3-5, coronin 1A, p53 isoform-dependently, PPARγ, Sirt1, IL-6Rα/gp130 (K48-linked, degradative), and SRB1 (K63-linked, recycling-promoting), with its stability controlled by the mTOR-Otubain-1 axis downstream of IL-2 and CD28 costimulation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RNF128 (GRAIL) is a type I transmembrane RING-finger E3 ubiquitin ligase that resides in the endocytic pathway and acts as a central negative regulator of T cell activation, immune tolerance, and inflammatory signaling [#0, #5]. Its defining architecture separates substrate recognition from catalysis: a luminal/extracellular protease-associated (PA) domain captures the ectodomains of transmembrane substrates while the cytosolic RING domain recruits E2 enzymes and transfers ubiquitin onto cytosolic lysines, the first single-subunit E3 described with such a membrane-separated arrangement [#2]. Through this mechanism GRAIL downregulates a panel of T cell surface and signaling proteins—tetraspanins CD151/CD81 [#2], the costimulatory ligand CD40L [#3], CD83 [#4], TCR-CD3 complex components [#7], and IL-21R [#12]—and degrades intracellular substrates including STAT6 to limit Th2 differentiation [#10] and the actin regulators Arp2/3-5 and coronin 1A to restrain immunological-synapse formation in anergic T cells [#8]. Genetic deletion in mice abolishes T cell anergy and oral tolerance and causes CD4 T cell hyperactivation, while GRAIL is required for normal regulatory T cell suppressive function [#5, #7]. GRAIL protein stability is set by an IL-2/CD28–Akt–mTOR axis that induces Otubain-1 translation to destabilize GRAIL during activation, with the otubain 1-ARF1 isoform conversely stabilizing it to maintain anergy [#1, #6]. Beyond degradative K48 ubiquitination, RNF128 also catalyzes activating K63-linked ubiquitination of TBK1 to drive IRF3-dependent IFN-β antiviral responses [#11] and K63-linked ubiquitination of scavenger receptor SRB1 to promote its Rab11-dependent recycling in macrophages [#23]. The same enzymatic logic operates outside immunity, where RNF128 ubiquitinates IL-6Rα and gp130 to suppress IL-6–STAT3 signaling and colitis-associated tumorigenesis [#22], targets PPARγ and Sirt1 in adipogenesis and hepatic lipid metabolism [#13, #18], and degrades TLR4 and MPO to restrain lung inflammation [#21]. In epithelial cancers, RNF128 controls p53 fate in an isoform-dependent manner: the active isoform 2, paired with the E2 UBE2D3, degrades mutant p53, whereas the N-glycosylated isoform 1 is catalytically impaired and stabilizes it, a switch that accompanies Barrett's esophagus progression to adenocarcinoma [#9, #15, #19].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Established RNF128/GRAIL as a transmembrane E3 ligase whose catalytic activity and endocytic trafficking are jointly required to restrain T cell cytokine production, defining its core role as a brake on T cell activation.\",\n      \"evidence\": \"In vitro ubiquitination plus retroviral transduction of T cell hybridomas with cytokine readouts; companion study defining Otubain-1 control of GRAIL stability\",\n      \"pmids\": [\"12705856\", \"14661020\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transmembrane substrates not yet identified at this stage\", \"Mechanism linking endocytic trafficking to cytokine transcription unresolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Linked GRAIL to the regulatory T cell program by showing its enrichment in Tregs and sufficiency to confer a suppressive phenotype, framing GRAIL as more than a generic activation brake.\",\n      \"evidence\": \"Quantitative RT-PCR and retroviral gain-of-function with functional suppression assay in a T cell line\",\n      \"pmids\": [\"17259178\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Foxp3-independent mechanism of suppression unexplained\", \"Endogenous requirement not tested (gain-of-function only)\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Resolved the biochemical logic of GRAIL by demonstrating that the luminal PA domain captures substrate ectodomains while the cytosolic RING catalyzes K48 ubiquitination, the first membrane-separated single-subunit E3 mechanism, and identified tetraspanins and CD40L as substrates.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP, in vitro ubiquitination, and surface-downregulation flow cytometry\",\n      \"pmids\": [\"18713730\", \"18641297\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of PA-domain substrate selectivity not defined\", \"Full substrate repertoire unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Genetic deletion proved GRAIL is required in vivo for T cell anergy and oral tolerance, and defined the IL-2/CD28-Akt-mTOR-Otubain-1 axis that times GRAIL degradation, while extending substrates to CD83.\",\n      \"evidence\": \"Grail knockout mice with proliferation, tolerance and autoimmunity models; pharmacological mTOR pathway dissection; CD83 lysine mutagenesis\",\n      \"pmids\": [\"19805371\", \"19414743\", \"19542455\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism connecting GRAIL loss to elevated baseline ERK1/2 not established\", \"How mTOR selectively translates Otubain-1 mRNA unresolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified the TCR-CD3 complex as a GRAIL substrate and tied GRAIL to Treg suppressive function, mechanistically connecting receptor downregulation to NFATc1 control and Th17 restraint.\",\n      \"evidence\": \"Co-IP for CD3 ubiquitination and GRAIL-deficient mouse autoimmune and Treg suppression assays\",\n      \"pmids\": [\"20493730\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which CD3 chain lysines are modified not mapped\", \"Causal link between TCR downregulation and Th17 program incomplete\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Extended GRAIL's reach to the actin cytoskeleton by showing it ubiquitinates Arp2/3-5 and coronin 1A, explaining impaired immunological-synapse F-actin in anergic T cells.\",\n      \"evidence\": \"In vitro ubiquitination with K48/K63 linkage analysis and confocal imaging of actin structures\",\n      \"pmids\": [\"22016387\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How a transmembrane/endocytic E3 accesses cytosolic actin regulators not explained\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed GRAIL targets p53 for degradation in a Mdm2-like negative feedback loop, opening a non-immune, tumor-relevant function in apoptosis and cell-cycle control.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, and apoptosis/cell-cycle assays after overexpression and knockdown in cultured cells\",\n      \"pmids\": [\"23370271\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Isoform-dependence not yet appreciated here\", \"Wild-type vs mutant p53 specificity unaddressed\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated GRAIL degrades STAT6 to control Th2 development, embedding GRAIL in a STAT6/GATA3 transcriptional feedback loop relevant to allergic asthma.\",\n      \"evidence\": \"Co-IP, ubiquitination, Grail-deficient mice, in vitro Th2 differentiation, asthma model, and promoter binding assays\",\n      \"pmids\": [\"25145352\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"STAT6 ubiquitination sites not mapped\", \"Cytosolic-substrate access mechanism unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Revealed a non-degradative mode in which RNF128 catalyzes K63-linked ubiquitination of TBK1 to activate IRF3 and IFN-β, establishing RNF128 as a positive regulator of antiviral innate immunity.\",\n      \"evidence\": \"Co-IP through the PA domain, in vitro ubiquitination, and RNF128-deficient cells/mice in viral infection models\",\n      \"pmids\": [\"27776110\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How linkage specificity (K63 vs K48) is selected per substrate unknown\", \"TBK1 ubiquitination sites not defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified IL-21R as a GRAIL substrate in CD8+ T cells, showing GRAIL loss boosts IL-21 signaling and antitumor T cell function.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, Grail-deficient mice, and transplantable lymphoma and adoptive-transfer therapy models\",\n      \"pmids\": [\"28798332\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"IL-21R ubiquitination sites not mapped\", \"Relative contribution among multiple T cell substrates unquantified\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Expanded GRAIL function to metabolism by showing it degrades PPARγ to regulate adipogenesis and body weight, indicating roles beyond immune cells.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, Grail KO mice on high-fat diet with glucose/insulin tolerance and in vitro adipogenesis assays\",\n      \"pmids\": [\"29743578\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Paradoxical reduction of PPARγ by both knockdown and overexpression unexplained\", \"Single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Resolved the p53 link mechanistically as isoform-dependent: catalytically active isoform 2 degrades mutant p53 while N-glycosylated isoform 1 stabilizes it, a switch tracking Barrett's progression and additional cancer-promoting substrates (CD44, cortactin) and EGFR/MAPK signaling.\",\n      \"evidence\": \"Isoform-specific constructs, ubiquitination assays, glycosylation/proline mutagenesis, xenografts, and co-IP across esophageal and melanoma models\",\n      \"pmids\": [\"31715145\", \"30832692\", \"31216681\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific regulation of isoform balance incompletely defined\", \"Reconciliation of tumor-suppressive vs tumor-promoting roles across cancers unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined the E2-E3 pairing controlling p53 fate (Iso2-UBE2D3 active vs Iso1-UBE2D1 inactive) and broadened substrates to Sirt1 in hepatic lipid metabolism and β-catenin in colorectal cancer.\",\n      \"evidence\": \"Single-cell RNA-seq, co-IP, ubiquitination with residue mutagenesis, clonogenic assays, and Grail KO/overexpression metabolic and cancer models\",\n      \"pmids\": [\"34416429\", \"33771967\", \"35035697\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why E2 partner switching occurs during disease progression unknown\", \"β-catenin regulation supported only by limited mechanistic detail\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Mapped specific degradative ubiquitination of IL-6Rα and gp130 with defined lysines, showing RNF128 suppresses IL-6-STAT3 signaling, colitis, and colorectal tumorigenesis.\",\n      \"evidence\": \"Co-IP, site-directed lysine mutagenesis, ubiquitination assay, and RNF128-deficient DSS colitis and AOM/DSS CRC models\",\n      \"pmids\": [\"38964734\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether IL-6Rα/gp130 are captured via the PA domain not directly tested\", \"Crosstalk with the EGFR/MAPK cancer-promoting axis unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established a recycling-promoting K63 function in macrophages, where RNF128 ubiquitinates SRB1 at K478 to block lysosomal degradation and drive Rab11 endosome recycling, aggravating atherosclerosis.\",\n      \"evidence\": \"Co-IP, K63-linkage-specific ubiquitination, K478 mutagenesis, macrophage-specific KO in ApoE/LDLR-deficient mice, and scRNA-seq\",\n      \"pmids\": [\"40038329\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants selecting K63-recycling vs K48-degradative outcomes per substrate unknown\", \"Generalizability of recycling function to other receptors untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved what governs RNF128's choice of ubiquitin linkage type and substrate fate (degradation, recycling, or activation) across its diverse substrate panel, and how a transmembrane endocytic ligase engages cytosolic substrates such as p53, STAT6, and actin regulators.\",\n      \"evidence\": \"No timeline study reconciles linkage-type selection or cytosolic-substrate access mechanistically\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unifying structural model of PA-domain vs cytosolic substrate engagement\", \"Linkage-determining cofactors/E2 selection rules undefined\", \"Context determining tumor-suppressive vs tumor-promoting output unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [0, 2, 11, 22, 23]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [2, 4, 7, 11, 22, 23]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 7, 12, 22]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [0, 23]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [2, 3, 7, 23]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 5, 7, 11, 22]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [2, 4, 22, 23]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [11, 22, 10]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [15, 19, 22, 23]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"TBK1\", \"STAT6\", \"CD40L\", \"CD83\", \"IL21R\", \"IL6R\", \"TP53\", \"SCARB1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}