{"gene":"TNFRSF10B","run_date":"2026-04-28T21:42:59","timeline":{"discoveries":[{"year":2006,"finding":"DcR2 (TRAIL-R4) is co-recruited with DR5 into the DISC upon TRAIL stimulation, where it inhibits initiator caspase activation; DcR2 also prevents DR4 recruitment within the DR5 DISC. In contrast, DcR1 inhibits DR5-mediated apoptosis by titrating TRAIL within lipid rafts rather than joining the DISC.","method":"Co-immunoprecipitation, DISC analysis, lipid raft fractionation, functional apoptosis assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP and DISC analysis with multiple orthogonal methods distinguishing two mechanistically distinct inhibition modes","pmids":["16980609"],"is_preprint":false},{"year":2000,"finding":"At physiological temperature (37°C), TRAIL binds DR5 with the highest affinity (KD ≤ 2 nM) among all its receptors (DR4, DcR1, DcR2, OPG), a temperature-dependent rank ordering not apparent at 4°C.","method":"Isothermal titration calorimetry, competitive ELISA, cell-surface binding assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — rigorous biophysical in vitro assays with multiple orthogonal methods","pmids":["10770955"],"is_preprint":false},{"year":2019,"finding":"The DR5 transmembrane helix (TMH) alone assembles a higher-order structure (dimer-trimer interaction network) that drives signaling; the unliganded ectodomain autoinhibits this clustering. Single TMH mutations disrupting either trimerization or dimerization abolish ligand-induced receptor activation. Proteolytic removal of the ectodomain fully activates downstream signaling in the absence of ligand.","method":"NMR structure of TMH in bicelles, site-directed mutagenesis of TMH, ectodomain proteolytic removal functional assays","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 — NMR structure plus mutagenesis plus functional reconstitution in a single rigorous study","pmids":["30827683"],"is_preprint":false},{"year":2009,"finding":"In glioblastoma, DR5 homotrimerizes upon TRAIL binding and recruits FADD and caspase-8 for DISC assembly in lipid rafts, initiating caspase-8 cleavage and apoptosis. In TRAIL-resistant cells, DISC is modified by RIP, c-FLIP, and PED/PEA-15 in non-raft fractions, inhibiting caspase-8 and activating NF-κB; siRNA knockdown of these modifiers redistributes DISC to lipid rafts and restores caspase-8 cleavage.","method":"DISC immunoprecipitation, lipid raft fractionation, siRNA knockdown, caspase activity assays","journal":"Journal of cellular and molecular medicine","confidence":"High","confidence_rationale":"Tier 2 — DISC biochemical analysis combined with functional siRNA rescue experiments and subcellular fractionation","pmids":["19432816"],"is_preprint":false},{"year":2013,"finding":"The HCMV UL141 glycoprotein forms a homodimer that engages two TRAIL-R2 monomers 90° apart in a heterotetrameric complex, using its Ig-domain to contact a surface on TRAIL-R2 that partially overlaps with the TRAIL binding site plus an additional distinct patch, enabling non-canonical death receptor interactions and blocking surface expression of DR5.","method":"X-ray crystal structure at 2.1 Å, binding affinity assays","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 1 — high-resolution crystal structure with biochemical validation of binding affinities","pmids":["23555243"],"is_preprint":false},{"year":2006,"finding":"Phage display-identified peptides and synthetic antibodies binding DR5 share a conserved tripeptide motif (within a disulfide-constrained loop or CDR-H3); X-ray crystal structure of an antibody:DR5 complex confirmed this motif is buried at the interface. Oligomeric presentation of DR5-binding peptides/antibodies induces potent proapoptotic signaling.","method":"Phage display, X-ray crystallography of antibody:DR5 complex, cell-based apoptosis assays","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 — crystal structure combined with functional validation","pmids":["16859704"],"is_preprint":false},{"year":2016,"finding":"Hepatitis B virus X protein (HBx) acts as an autophagy receptor-like molecule that directly binds TNFRSF10B/DR5 and recruits it to phagophores (LC3B-positive autophagosomes), leading to lysosomal (not proteasomal) degradation of DR5, thereby suppressing TRAIL-mediated apoptosis and aiding viral immune evasion.","method":"Co-immunoprecipitation, GST pulldown, LC3B tandem-fluorescence microscopy, pharmacological autophagy inhibition, LC3B siRNA knockdown, immunoblotting of patient liver tissues","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 — direct protein-protein interaction confirmed by Co-IP and GST pulldown, supported by multiple orthogonal methods and patient tissue validation","pmids":["27740879"],"is_preprint":false},{"year":2004,"finding":"The signal recognition particle (SRP) complex is selectively required for DR4- but not DR5-mediated apoptosis: SRP siRNA knockdown dramatically reduces cell-surface DR4 and inhibits DR4-dependent cell death, while having little effect on cell-surface DR5 levels or DR5-mediated apoptosis.","method":"siRNA library screen, flow cytometry for cell-surface receptor levels, cell viability apoptosis assays, stable knockdown cell lines","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — systematic siRNA screen with mechanistic follow-up establishing differential receptor regulation","pmids":["15356269"],"is_preprint":false},{"year":2020,"finding":"FLIP(L) can both inhibit and promote caspase-8 at the TRAIL-R2 DISC in a stoichiometry-dependent manner. FLIP(L) recruitment to the DISC requires caspase-8 despite its ability to interact with FADD alone. In the complete absence of FLIP(L), procaspase-8 activation at the TRAIL-R2 DISC has slower kinetics but ultimately greater apoptosis.","method":"DISC immunoprecipitation, caspase activity assays, FLIP stoichiometry manipulation, FLIP/caspase-8 genetic manipulation","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 — mechanistic DISC assembly model validated by multiple orthogonal biochemical approaches","pmids":["32009295"],"is_preprint":false},{"year":2020,"finding":"The SCFSkp2 E3 ubiquitin ligase complex (containing Cullin-1 in its active NEDDylated form) interacts with both the DR5 pre-ligand association complex (PLAC) and the activated DISC. Processing of FLIP(L) to its p43-form at the TRAIL-R2 DISC enhances its interaction with co-localized SCFSkp2, leading to FLIP(L) ubiquitination and degradation, thereby modulating DR5-mediated apoptosis.","method":"Co-immunoprecipitation, NEDDylation inhibitor (MLN4924), siRNA knockdown, ubiquitination assays","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP of DISC components with E3 ligase, supported by functional ubiquitination assays and genetic knockdown","pmids":["32313199"],"is_preprint":false},{"year":2022,"finding":"Senescent cancer cells upregulate DR5 and its ligand TRAIL via NF-κB signaling but are protected from death by increased cFLIP expression. CRISPR screens identified cFLIP loss as a vulnerability of senescent cancer cells. DR5 agonistic antibody activation combined with BRD2 inhibitor-mediated cFLIP suppression efficiently kills senescent cancer cells; adjacent non-senescent cells are also killed via a bystander cytokine-secretion mechanism.","method":"CRISPR/Cas9 genetic screens, DR5 agonistic antibody treatment, BRD2 inhibition, animal xenograft models","journal":"Nature cancer","confidence":"High","confidence_rationale":"Tier 2 — genome-wide CRISPR screen combined with mechanistic validation and in vivo models","pmids":["36414711"],"is_preprint":false},{"year":2022,"finding":"CDK4/6 phosphorylate the p53 family member p73 at threonine 86, sequestering p73 in the cytoplasm. CDK4/6 inhibition causes p73 dephosphorylation and nuclear translocation, which transcriptionally activates DR5 (TNFRSF10B). DR5 induction then promotes immunogenic cancer cell death; DR5 deletion in cancer cells abrogates the sensitizing effects of CDK4/6 inhibitors on TRAIL, 5-FU, and anti-PD-1 therapy.","method":"CDK4/6 kinase assay, phospho-site mutagenesis, nuclear fractionation, transcription reporter assay, DR5 knockout in vitro and in vivo","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1–2 — kinase-substrate relationship established with mutagenesis, coupled with genetic deletion validation in vivo","pmids":["35149588"],"is_preprint":false},{"year":2023,"finding":"KIM1 (kidney injury molecule-1) binds directly to the extracellular domain (ECD) of DR5 (TNFRSF10B), promoting DR5 multimerization, activating the caspase cascade, and inducing renal tubular cell apoptosis during AKI. Upstream, transcription factor YY1 is downregulated upon injury and normally represses KIM1 transcription by binding its promoter. Blocking KIM1-DR5 interaction with designed peptides is reno-protective.","method":"Renal tubule-specific Kim1 knockout mouse, Co-immunoprecipitation of KIM1 with DR5, YY1 ChIP at KIM1 promoter, rationally designed blocking peptides, cisplatin and ischemia/reperfusion AKI models","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — genetic KO plus Co-IP plus ChIP plus functional blocking peptide validation in multiple in vivo models","pmids":["37460623"],"is_preprint":false},{"year":2001,"finding":"Missense mutations of KILLER/DR5 in gastric cancers are loss-of-function: mutant DR5 proteins inhibit apoptotic cell death in transfection assays and tumors harboring DR5 mutations lack p53 mutations, indicating an independent mechanism of apoptosis escape.","method":"Mutation analysis of 43 gastric cancers, allelic loss analysis, transfection-based apoptosis assays of mutant DR5 constructs","journal":"Gastroenterology","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function confirmed by functional transfection assay, but single study","pmids":["11677215"],"is_preprint":false},{"year":2004,"finding":"The TRAIL-R2 (DR5) promoter lacks a canonical TATA-box but contains two functional Sp1-binding sites; a p53-binding site in intron 1 mediates p53-dependent transcriptional upregulation of DR5. The minimal promoter is within -198 to -116 upstream of the ATG.","method":"Promoter deletion analysis, reporter gene assays, identification of p53-response element in intron 1","journal":"Vitamins and hormones","confidence":"Medium","confidence_rationale":"Tier 2 — promoter reporter assays with deletion mapping; single study","pmids":["15110170"],"is_preprint":false},{"year":2012,"finding":"Small-molecule bioymifi directly targets DR5 extracellularly to induce DR5 clustering and aggregation on the cell surface, leading to caspase-dependent apoptosis in human cancer cells, acting as a single agent without requiring TRAIL.","method":"High-throughput chemical screen, structure-activity relationship studies, cell-based apoptosis assays, DR5 clustering microscopy","journal":"Nature chemical biology","confidence":"Medium","confidence_rationale":"Tier 2 — compound:receptor direct interaction demonstrated with functional clustering and apoptosis assays, single lab","pmids":["23292651"],"is_preprint":false},{"year":2008,"finding":"DR5 mediates anoikis (detachment-induced apoptosis) in human colorectal carcinoma cells through the extrinsic apoptotic pathway: suspension culture increases DR5 and TRAIL expression, an antagonistic anti-DR5 antibody blocks caspase-8 activation, and DR5 or TRAIL siRNA knockdown inhibits anoikis. DR4 antibody or TRAIL-neutralizing antibody do not consistently reduce anoikis.","method":"Suspension culture anoikis model, antagonistic DR5 antibody treatment, siRNA knockdown of DR5 and TRAIL, caspase-8 cleavage assays","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal approaches (antibody blockade + siRNA) in the same cellular context, single lab","pmids":["18245494"],"is_preprint":false},{"year":2017,"finding":"DR5 assembles composite pro-apoptotic/pro-survival plasma membrane-proximal platforms within DR4-DR5-DcR2 hetero-oligomeric complexes; a single DR5 receptor suffices to propagate TRAIL signaling to both death and survival (NF-κB, PI3K/Akt, MAPK) pathways. FADD and procaspase-8 at these complexes also transduce non-apoptotic signaling, not exclusively pro-apoptotic signals.","method":"DISC immunoprecipitation, receptor-specific siRNA, dominant-negative constructs, signaling pathway assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — mechanistic platform characterization using biochemical pulldowns and multiple siRNA conditions, single lab","pmids":["29048428"],"is_preprint":false},{"year":2014,"finding":"In mouse spermatogonial stem cells (SSCs), the Trp53-Trp53inp1-Tnfrsf10b (DR5) pathway mediates radiation-induced apoptosis via the extrinsic pathway; Tnfrsf10b deficiency (but not Bbc3/PUMA deficiency) rescues SSCs after irradiation, whereas Bbc3 mediates apoptosis in committed spermatogonia. Trp53inp1 upregulates Tnfrsf10b upon irradiation.","method":"Spermatogonial transplantation, genetic KO of Trp53/Bbc3/Tnfrsf10b in mice, irradiation dose-response","journal":"Stem cell reports","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis in relevant tissue-specific KO model, replicated across multiple genotypes","pmids":["25358794"],"is_preprint":false},{"year":2010,"finding":"DR5 is upregulated in neurons following transient global cerebral ischemia (while TRAIL is upregulated in astrocytes/microglia); treatment with soluble DR5 protein blocks endogenous TRAIL-DR5 interaction and reduces ischemic neuronal death, demonstrating that the TRAIL-DR5 axis mediates delayed neuronal apoptosis after ischemia.","method":"RT-PCR, immunohistochemistry, dual immunofluorescence, soluble DR5 pharmacological blockade in mouse ischemia model","journal":"Neurobiology of disease","confidence":"Medium","confidence_rationale":"Tier 2 — cell-type-specific expression profiling combined with functional blockade in vivo, single study","pmids":["20359534"],"is_preprint":false},{"year":2008,"finding":"Rottlerin upregulates DR5 expression (mRNA and protein) via a CHOP-dependent mechanism (CHOP-binding site in DR5 promoter is required) and independently of PKC-delta. DR5 upregulation is required for rottlerin-induced apoptosis, as DR5 siRNA attenuates cell death.","method":"siRNA knockdown of DR5, DR5 promoter reporter with CHOP-binding site mutation, PKC-delta siRNA and overexpression, Western blot and RT-PCR","journal":"Carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 — promoter mutagenesis plus siRNA knockdown establishing mechanism, single lab","pmids":["19037087"],"is_preprint":false},{"year":2015,"finding":"An ERV9-LTR inserted upstream of TNFRSF10B drives a distinct proapoptotic DR5 transcript in male germline cells; HDAC inhibitors reactivate this ERV9-LTR-driven TNFRSF10B expression in testicular cancer cells, and cell death upon HDAC inhibitor + TRAIL treatment depends on TNFRSF10B expression.","method":"3'RACE/next-generation sequencing, HDAC inhibitor treatment, siRNA/shRNA knockdown of TNFRSF10B, cell death assays","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 — genomic 3'RACE identification plus functional TNFRSF10B knockdown validation, single lab","pmids":["26024393"],"is_preprint":false},{"year":2020,"finding":"YIPF2 physically interacts with both TNFRSF10B (DR5) and RAB8, and competes with RAB8 to prevent RAB8-mediated removal of DR5 from the plasma membrane to the cytoplasm, thereby maintaining high cell-surface DR5 levels and promoting chemotherapy-induced apoptosis in NSCLC cells.","method":"Co-immunoprecipitation of YIPF2/RAB8/DR5, flow cytometry of cell-surface DR5, siRNA knockdown, pemetrexed treatment","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP of three interacting proteins plus functional competition assay, single lab","pmids":["32303681"],"is_preprint":false},{"year":2012,"finding":"p53 selectively controls myeloma cell sensitivity to DR5-mediated (but not DR4-mediated) apoptosis: TP53 wild-type cells overexpress DR5; p53 activation (by nutlin-3a or melphalan) increases DR5 expression and lexatumumab (DR5 agonist) efficacy; p53 silencing decreases DR5 expression and induces resistance to lexatumumab, without affecting DR4 expression or sensitivity to mapatumumab.","method":"p53 siRNA, nutlin-3a pharmacological activation, Western blot for DR4/DR5, DR5/DR4 agonistic antibody treatment (lexatumumab/mapatumumab), primary myeloma cells","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — genetic and pharmacological p53 manipulation with mechanistic readout in multiple cell types, single lab","pmids":["22738917"],"is_preprint":false},{"year":2010,"finding":"In pancreatic cancer cells, TRAIL signals predominantly through DR4 despite functional DR5 expression; TRAIL stimulates DR4-DR5 heterocomplexes in addition to DR4 and DR5 homocomplexes, but DR4-specific Fab fragment blockade abolishes most TRAIL-induced apoptosis. PKC inhibition enables DR5 to trigger apoptosis in response to TRAIL.","method":"DR4/DR5 receptor-specific Fab blockade, DISC immunoprecipitation, PKC inhibition, agonistic antibodies (mapatumumab/lexatumumab)","journal":"Journal of molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 — DISC analysis plus receptor-specific blockade, single lab","pmids":["20354842"],"is_preprint":false},{"year":2016,"finding":"KPNB1 (importin β1) inhibition overcomes TRAIL resistance in glioblastoma cells by promoting ATF4-mediated DR5 upregulation (via UPR), enhancing DISC assembly, freeing Bax/Bak from Mcl-1, and downregulating FLIP through 4E-BP1-mediated translational suppression. KPNB1 also regulates nuclear import of DR5.","method":"KPNB1 siRNA and pharmacological inhibition, ATF4 siRNA, DISC immunoprecipitation, Western blot, caspase assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — multiple siRNA-based mechanistic dissections converging on DR5 regulation, single lab","pmids":["30742128"],"is_preprint":false}],"current_model":"TNFRSF10B (DR5/TRAIL-R2) is a death receptor that, upon TRAIL binding or clustering, homotrimerizes (or forms higher-order assemblies via transmembrane helix interactions) to recruit FADD and caspase-8 into a DISC—preferentially within lipid rafts—driving caspase-8 cleavage and extrinsic apoptosis; DR5 expression is transcriptionally activated by p53 (via an intronic response element) and p73 (dephosphorylated after CDK4/6 inhibition), regulated at the cell surface by YIPF2/RAB8 vesicle trafficking, targeted for lysosomal degradation by HBV HBx-mediated autophagy, and modulated at the DISC by FLIP(L) stoichiometry and SCFSkp2-dependent ubiquitination, while its transmembrane domain alone can drive ligand-independent higher-order clustering and signaling when ectodomain autoinhibition is relieved."},"narrative":{"teleology":[{"year":2000,"claim":"Establishing the quantitative ligand-receptor interaction hierarchy resolved which TRAIL receptor dominates signaling under physiological conditions: DR5 binds TRAIL with the highest affinity (KD ≤ 2 nM at 37°C) among all five receptors.","evidence":"Isothermal titration calorimetry and competitive ELISA at multiple temperatures","pmids":["10770955"],"confidence":"High","gaps":["Affinity measurements do not address how receptor density or co-receptor expression modulates effective signaling in vivo"]},{"year":2001,"claim":"The identification of loss-of-function DR5 missense mutations in gastric cancers established that DR5 acts as an independent tumor suppressor whose inactivation provides an alternative to p53 loss for apoptosis evasion.","evidence":"Mutational analysis of 43 gastric cancers with transfection-based functional assays of mutant DR5","pmids":["11677215"],"confidence":"Medium","gaps":["Mutations characterized in a single cancer type","No structural explanation for loss of function","Not independently replicated in a second cohort"]},{"year":2004,"claim":"Mapping the minimal promoter and intronic p53-response element resolved how DR5 is transcriptionally regulated and linked p53 status to DR5 expression, while the finding that SRP is dispensable for DR5 (but not DR4) surface delivery revealed distinct ER-trafficking routes for these homologous receptors.","evidence":"Promoter deletion/reporter assays for p53 element; siRNA library screen with flow cytometry for SRP requirement","pmids":["15110170","15356269"],"confidence":"Medium","gaps":["Sp1 and p53 contributions not dissected under endogenous chromatin context","Alternative DR5 ER-targeting mechanism not identified"]},{"year":2006,"claim":"Delineation of decoy receptor mechanisms showed that DcR2 inhibits DR5 signaling by co-assembling into the DISC and blocking caspase activation, while DcR1 sequesters TRAIL in lipid rafts—two mechanistically distinct inhibitory strategies acting on the same receptor.","evidence":"DISC co-immunoprecipitation, lipid raft fractionation, and functional apoptosis assays","pmids":["16980609"],"confidence":"High","gaps":["Stoichiometric requirements for DcR2 inhibition within the DISC not quantified","In vivo relevance of lipid raft compartmentalization not tested"]},{"year":2008,"claim":"DR5 was established as the primary mediator of anoikis in colorectal carcinoma cells and its transcription was shown to be induced by CHOP via a promoter-binding site, expanding DR5 function beyond ligand-dependent killing to detachment-induced and ER-stress-linked apoptosis.","evidence":"Suspension culture with antagonistic DR5 antibody/siRNA blockade; CHOP-site promoter mutagenesis with rottlerin-induced DR5 upregulation","pmids":["18245494","19037087"],"confidence":"Medium","gaps":["Anoikis role shown in one cell type","Relative contributions of CHOP vs. p53 to DR5 induction under stress not compared"]},{"year":2009,"claim":"DISC biochemical analysis in glioblastoma demonstrated that DR5 homotrimerization and DISC assembly occur preferentially in lipid rafts, while TRAIL-resistant cells redirect the DISC to non-raft fractions enriched in c-FLIP, RIP, and PED/PEA-15, thereby switching output from caspase-8 activation to NF-κB signaling.","evidence":"DISC immunoprecipitation with lipid raft fractionation and siRNA rescue of caspase-8 cleavage","pmids":["19432816"],"confidence":"High","gaps":["Mechanism governing raft vs. non-raft DISC partitioning not identified","Whether raft localization is a cause or consequence of resistance not fully resolved"]},{"year":2010,"claim":"DR5 was implicated in neuronal delayed apoptosis after cerebral ischemia (where neurons express DR5 and surrounding glia express TRAIL), and pancreatic cancer studies revealed DR4-DR5 heterocomplexes and PKC-dependent control of DR5 signaling competence, broadening DR5 biology to non-cancer contexts and heteromeric receptor assemblies.","evidence":"Soluble DR5 blockade in mouse ischemia model; DR4/DR5 receptor-specific Fab and DISC IP in pancreatic cancer cells","pmids":["20359534","20354842"],"confidence":"Medium","gaps":["Molecular basis of PKC-mediated DR5 suppression unknown","DR4-DR5 heterocomplex stoichiometry not determined"]},{"year":2012,"claim":"p53 was shown to selectively control DR5 (but not DR4) expression and agonist sensitivity in myeloma, and the small molecule bioymifi was found to directly cluster DR5 extracellularly to trigger apoptosis without TRAIL, demonstrating that forced receptor clustering suffices for signaling.","evidence":"p53 siRNA/nutlin-3a with DR5 agonistic antibody in myeloma; high-throughput screen identifying bioymifi with DR5 clustering microscopy","pmids":["22738917","23292651"],"confidence":"Medium","gaps":["Bioymifi binding site on DR5 not structurally resolved","In vivo efficacy of bioymifi not demonstrated"]},{"year":2013,"claim":"The 2.1 Å crystal structure of HCMV UL141 bound to DR5 revealed how a viral immunoevasin blocks DR5 surface expression: a UL141 homodimer engages two DR5 monomers at a site overlapping the TRAIL-binding surface, defining a non-canonical DR5 interaction mode exploited for immune evasion.","evidence":"X-ray crystallography at 2.1 Å resolution with binding affinity assays","pmids":["23555243"],"confidence":"High","gaps":["Whether UL141 also affects intracellular DR5 trafficking not addressed","Relevance to in vivo HCMV pathogenesis not tested"]},{"year":2014,"claim":"Genetic epistasis in mouse spermatogonial stem cells established that the p53–Trp53inp1–Tnfrsf10b axis mediates extrinsic-pathway apoptosis after irradiation in SSCs, whereas Bbc3/PUMA governs intrinsic apoptosis in committed spermatogonia, revealing cell-type-specific death receptor pathway usage.","evidence":"Spermatogonial transplantation in Trp53/Bbc3/Tnfrsf10b single and compound KO mice with irradiation","pmids":["25358794"],"confidence":"Medium","gaps":["Mechanism by which Trp53inp1 upregulates Tnfrsf10b not molecularly defined","Whether human SSCs show the same pathway dependence is unknown"]},{"year":2016,"claim":"HBV HBx was identified as an autophagy receptor-like molecule that directly binds DR5, recruits it to LC3B-positive autophagosomes, and targets it for lysosomal degradation—the first demonstration of selective autophagic degradation of a death receptor as a viral immune evasion strategy.","evidence":"Co-IP, GST pulldown, LC3B tandem-fluorescence microscopy, autophagy inhibition, and patient liver tissue validation","pmids":["27740879"],"confidence":"High","gaps":["Autophagy receptor motif in HBx mediating DR5 recognition not mapped","Whether other death receptors are co-degraded not tested"]},{"year":2017,"claim":"DR5 was shown to participate in composite hetero-oligomeric signaling platforms with DR4 and DcR2 that simultaneously engage pro-apoptotic (FADD/caspase-8) and pro-survival (NF-κB, PI3K/Akt, MAPK) outputs, establishing that a single DR5 receptor can propagate both death and survival signals.","evidence":"DISC immunoprecipitation with receptor-specific siRNA and dominant-negative constructs","pmids":["29048428"],"confidence":"Medium","gaps":["Structural basis of heteromeric receptor assembly unknown","Quantitative determinants of death vs. survival output balance not defined"]},{"year":2019,"claim":"NMR structure of the DR5 transmembrane helix revealed a dimer-of-trimers higher-order assembly that is necessary and sufficient for signaling; the unliganded ectodomain autoinhibits this clustering, and proteolytic ectodomain removal fully activates signaling without ligand—resolving the long-standing question of how TRAIL binding is transduced across the membrane.","evidence":"NMR in bicelles, site-directed TMH mutagenesis, ectodomain proteolytic removal functional assays","pmids":["30827683"],"confidence":"High","gaps":["Full-length receptor structure in native membrane not available","How ectodomain conformational change is transmitted to the TMH not resolved at atomic level"]},{"year":2020,"claim":"The DISC assembly mechanism was refined: FLIP(L) acts as a stoichiometry-dependent modulator—promoting initial caspase-8 activation at low ratios but inhibiting at high ratios—and the SCFSkp2 E3 ligase was found to ubiquitinate processed FLIP(L) at the DISC, providing a built-in mechanism for shifting the apoptotic threshold. Cell-surface DR5 levels were shown to be maintained by YIPF2 competing with RAB8-mediated internalization.","evidence":"DISC IP with FLIP stoichiometry manipulation; Cullin-1 NEDDylation inhibitor and Skp2 siRNA with ubiquitination assays; YIPF2/RAB8/DR5 Co-IP with flow cytometry","pmids":["32009295","32313199","32303681"],"confidence":"High","gaps":["Structural basis of FLIP(L) stoichiometric switching unknown","Whether SCFSkp2 modulation of FLIP occurs at all death receptor DISCs not tested","YIPF2-RAB8 competition validated in one cell type"]},{"year":2022,"claim":"DR5 was placed at the nexus of senescence-associated vulnerability and CDK4/6-p73 transcriptional control: senescent cancer cells upregulate DR5 via NF-κB but are protected by cFLIP, while CDK4/6 inhibition dephosphorylates p73 to transcriptionally activate DR5 and promote immunogenic cell death—establishing DR5 as a pharmacologically exploitable node in therapy-induced senescence and combination immunotherapy.","evidence":"CRISPR screens in senescent cells with DR5 agonist/BRD2 inhibitor in xenografts; CDK4/6 kinase assay, p73 phospho-mutagenesis, DR5 KO in vivo","pmids":["36414711","35149588"],"confidence":"High","gaps":["Whether p73-mediated DR5 induction operates in non-cancer tissues unknown","Bystander killing mechanism via secreted cytokines not fully characterized"]},{"year":2023,"claim":"KIM1 was identified as a novel non-TRAIL ligand that binds the DR5 ectodomain, promotes DR5 multimerization, and activates caspase-dependent renal tubular apoptosis during acute kidney injury—extending DR5 function to a non-canonical ligand context in non-cancer tissue.","evidence":"Renal tubule-specific Kim1 KO mouse, Co-IP of KIM1-DR5, YY1 ChIP, blocking peptides in cisplatin and ischemia-reperfusion AKI models","pmids":["37460623"],"confidence":"High","gaps":["Structural basis of KIM1-DR5 interaction not determined","Whether KIM1-DR5 interaction occurs in tissues other than kidney not explored"]},{"year":null,"claim":"Key unresolved questions include the full-length structure of DR5 in native membranes, the precise conformational mechanism by which ectodomain engagement releases TMH autoinhibition, the quantitative rules governing death-vs-survival signaling output from heteromeric DR4/DR5/DcR2 platforms, and whether non-canonical ligands such as KIM1 engage the same or distinct multimerization geometry as TRAIL.","evidence":"","pmids":[],"confidence":"Low","gaps":["No full-length DR5 structure in native membrane","Ectodomain-to-TMH allosteric mechanism unresolved at atomic level","Heteromeric receptor stoichiometry and signaling rules not quantified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[1,2,3,5,12,15]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,2,3,15,22]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[6,22]}],"pathway":[{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[0,3,8,9,16,18]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,10,17]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[6,11]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[6]}],"complexes":["DISC (death-inducing signaling complex)","DR4-DR5-DcR2 hetero-oligomeric signaling platform"],"partners":["FADD","CASP8","CFLAR","TNFSF10","TNFRSF10D","YIPF2","RAB8","HAVCR1"],"other_free_text":[]},"mechanistic_narrative":"TNFRSF10B (DR5/TRAIL-R2) is a death receptor that transduces extrinsic apoptotic signals upon binding its ligand TRAIL or upon ligand-independent clustering when ectodomain autoinhibition is relieved. TRAIL binds DR5 with the highest affinity among TRAIL receptors (KD ≤ 2 nM at 37°C), triggering transmembrane helix-mediated higher-order oligomerization that recruits FADD and caspase-8 into a death-inducing signaling complex (DISC), preferentially assembled within lipid rafts; DISC composition is tuned by FLIP(L) stoichiometry—which can either accelerate or inhibit caspase-8 activation—and by SCFSkp2-dependent ubiquitination of processed FLIP(L) [PMID:10770955, PMID:30827683, PMID:19432816, PMID:32009295, PMID:32313199]. DR5 transcription is activated by p53 via an intronic response element, by CHOP via a promoter-binding site, and by dephosphorylated p73 following CDK4/6 inhibition, while cell-surface DR5 levels are maintained by YIPF2-mediated competition with RAB8 vesicle trafficking and reduced by HBV HBx-directed autophagic degradation [PMID:15110170, PMID:19037087, PMID:35149588, PMID:32303681, PMID:27740879]. Beyond canonical apoptosis in cancer cells and during anoikis, DR5 mediates tissue-specific cell death in spermatogonial stem cells after irradiation and in neurons following cerebral ischemia, and participates in dual pro-apoptotic/pro-survival signaling platforms formed with DR4 and DcR2 that activate NF-κB and MAPK pathways [PMID:25358794, PMID:20359534, PMID:29048428, PMID:16980609]."},"prefetch_data":{"uniprot":{"accession":"O14763","full_name":"Tumor necrosis factor receptor superfamily member 10B","aliases":["Death receptor 5","TNF-related apoptosis-inducing ligand receptor 2","TRAIL receptor 2","TRAIL-R2"],"length_aa":440,"mass_kda":47.9,"function":"Receptor for the cytotoxic ligand TNFSF10/TRAIL (PubMed:10549288). The adapter molecule FADD recruits caspase-8 to the activated receptor. The resulting death-inducing signaling complex (DISC) performs caspase-8 proteolytic activation which initiates the subsequent cascade of caspases (aspartate-specific cysteine proteases) mediating apoptosis. Promotes the activation of NF-kappa-B. 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antiproliferative effect on NSCLC cells induced by p38 MAPK-mediated suppression of NF-κB and up-regulation of TNFRSF10B (DR5).","date":"2013","source":"British journal of pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/23082969","citation_count":22,"is_preprint":false},{"pmid":"37120688","id":"PMC_37120688","title":"Therapeutic efficacy of a MMAE-based anti-DR5 drug conjugate Oba01 in preclinical models of pancreatic cancer.","date":"2023","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/37120688","citation_count":22,"is_preprint":false},{"pmid":"32083004","id":"PMC_32083004","title":"The miR-372-ZBTB7A Oncogenic Axis Suppresses TRAIL-R2 Associated Drug Sensitivity in Oral Carcinoma.","date":"2020","source":"Frontiers in oncology","url":"https://pubmed.ncbi.nlm.nih.gov/32083004","citation_count":22,"is_preprint":false},{"pmid":"28808321","id":"PMC_28808321","title":"The proteasome deubiquitinase inhibitor b-AP15 enhances DR5 activation-induced apoptosis through stabilizing DR5.","date":"2017","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/28808321","citation_count":22,"is_preprint":false},{"pmid":"32200503","id":"PMC_32200503","title":"CUDC-907 enhances TRAIL-induced apoptosis through upregulation of DR5 in breast cancer cells.","date":"2020","source":"Journal of cell communication and signaling","url":"https://pubmed.ncbi.nlm.nih.gov/32200503","citation_count":21,"is_preprint":false},{"pmid":"26499766","id":"PMC_26499766","title":"Goniothalamin enhances TRAIL-induced apoptosis in colorectal cancer cells through DR5 upregulation and cFLIP downregulation.","date":"2015","source":"International journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/26499766","citation_count":21,"is_preprint":false},{"pmid":"20410100","id":"PMC_20410100","title":"Genetic variation in APOJ, LPL, and TNFRSF10B affects plasma fatty acid distribution in Alaskan Eskimos.","date":"2010","source":"The American journal of clinical nutrition","url":"https://pubmed.ncbi.nlm.nih.gov/20410100","citation_count":20,"is_preprint":false},{"pmid":"26829656","id":"PMC_26829656","title":"Morusin Induces TRAIL Sensitization by Regulating EGFR and DR5 in Human Glioblastoma Cells.","date":"2016","source":"Journal of natural products","url":"https://pubmed.ncbi.nlm.nih.gov/26829656","citation_count":20,"is_preprint":false},{"pmid":"30359552","id":"PMC_30359552","title":"Ixazomib promotes CHOP-dependent DR5 induction and apoptosis in colorectal cancer cells.","date":"2018","source":"Cancer biology & therapy","url":"https://pubmed.ncbi.nlm.nih.gov/30359552","citation_count":20,"is_preprint":false},{"pmid":"34728311","id":"PMC_34728311","title":"Enhanced extrinsic apoptosis of therapy-induced senescent cancer cells using a death receptor 5 (DR5) selective agonist.","date":"2021","source":"Cancer letters","url":"https://pubmed.ncbi.nlm.nih.gov/34728311","citation_count":20,"is_preprint":false},{"pmid":"15110170","id":"PMC_15110170","title":"Promoter of TRAIL-R2 gene.","date":"2004","source":"Vitamins and hormones","url":"https://pubmed.ncbi.nlm.nih.gov/15110170","citation_count":19,"is_preprint":false},{"pmid":"32303681","id":"PMC_32303681","title":"YIPF2 promotes chemotherapeutic agent-mediated apoptosis via enhancing TNFRSF10B recycling to plasma membrane in non-small cell lung cancer cells.","date":"2020","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/32303681","citation_count":19,"is_preprint":false},{"pmid":"28483458","id":"PMC_28483458","title":"Killer cells in atherosclerosis.","date":"2017","source":"European journal of pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/28483458","citation_count":19,"is_preprint":false},{"pmid":"25293521","id":"PMC_25293521","title":"The XIAP inhibitor Embelin enhances TRAIL-induced apoptosis in human leukemia cells by DR4 and DR5 upregulation.","date":"2014","source":"Tumour biology : the journal of the International Society for Oncodevelopmental Biology and Medicine","url":"https://pubmed.ncbi.nlm.nih.gov/25293521","citation_count":19,"is_preprint":false},{"pmid":"23839018","id":"PMC_23839018","title":"TNFRSF10B polymorphisms and haplotypes associated with increased risk of death in non-small cell lung cancer.","date":"2013","source":"Carcinogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/23839018","citation_count":17,"is_preprint":false},{"pmid":"20711434","id":"PMC_20711434","title":"Puma and Trail/Dr5 pathways control radiation-induced apoptosis in distinct populations of testicular progenitors.","date":"2010","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/20711434","citation_count":17,"is_preprint":false},{"pmid":"30463333","id":"PMC_30463333","title":"Maritoclax Enhances TRAIL-Induced Apoptosis via CHOP-Mediated Upregulation of DR5 and miR-708-Mediated Downregulation of cFLIP.","date":"2018","source":"Molecules (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/30463333","citation_count":17,"is_preprint":false},{"pmid":"24002210","id":"PMC_24002210","title":"Ibuprofen enhances TRAIL-induced apoptosis through DR5 upregulation.","date":"2013","source":"Oncology reports","url":"https://pubmed.ncbi.nlm.nih.gov/24002210","citation_count":17,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":46230,"output_tokens":6418,"usd":0.11748},"stage2":{"model":"claude-opus-4-6","input_tokens":10053,"output_tokens":4436,"usd":0.241748},"total_usd":0.359228,"stage1_batch_id":"msgbatch_01RPbVc9PDH9zQmYK5Hs6srm","stage2_batch_id":"msgbatch_01JVbVLzeKN2yVrsGp3zC8aM","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2006,\n      \"finding\": \"DcR2 (TRAIL-R4) is co-recruited with DR5 into the DISC upon TRAIL stimulation, where it inhibits initiator caspase activation; DcR2 also prevents DR4 recruitment within the DR5 DISC. In contrast, DcR1 inhibits DR5-mediated apoptosis by titrating TRAIL within lipid rafts rather than joining the DISC.\",\n      \"method\": \"Co-immunoprecipitation, DISC analysis, lipid raft fractionation, functional apoptosis assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP and DISC analysis with multiple orthogonal methods distinguishing two mechanistically distinct inhibition modes\",\n      \"pmids\": [\"16980609\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"At physiological temperature (37°C), TRAIL binds DR5 with the highest affinity (KD ≤ 2 nM) among all its receptors (DR4, DcR1, DcR2, OPG), a temperature-dependent rank ordering not apparent at 4°C.\",\n      \"method\": \"Isothermal titration calorimetry, competitive ELISA, cell-surface binding assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — rigorous biophysical in vitro assays with multiple orthogonal methods\",\n      \"pmids\": [\"10770955\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The DR5 transmembrane helix (TMH) alone assembles a higher-order structure (dimer-trimer interaction network) that drives signaling; the unliganded ectodomain autoinhibits this clustering. Single TMH mutations disrupting either trimerization or dimerization abolish ligand-induced receptor activation. Proteolytic removal of the ectodomain fully activates downstream signaling in the absence of ligand.\",\n      \"method\": \"NMR structure of TMH in bicelles, site-directed mutagenesis of TMH, ectodomain proteolytic removal functional assays\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — NMR structure plus mutagenesis plus functional reconstitution in a single rigorous study\",\n      \"pmids\": [\"30827683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In glioblastoma, DR5 homotrimerizes upon TRAIL binding and recruits FADD and caspase-8 for DISC assembly in lipid rafts, initiating caspase-8 cleavage and apoptosis. In TRAIL-resistant cells, DISC is modified by RIP, c-FLIP, and PED/PEA-15 in non-raft fractions, inhibiting caspase-8 and activating NF-κB; siRNA knockdown of these modifiers redistributes DISC to lipid rafts and restores caspase-8 cleavage.\",\n      \"method\": \"DISC immunoprecipitation, lipid raft fractionation, siRNA knockdown, caspase activity assays\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — DISC biochemical analysis combined with functional siRNA rescue experiments and subcellular fractionation\",\n      \"pmids\": [\"19432816\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The HCMV UL141 glycoprotein forms a homodimer that engages two TRAIL-R2 monomers 90° apart in a heterotetrameric complex, using its Ig-domain to contact a surface on TRAIL-R2 that partially overlaps with the TRAIL binding site plus an additional distinct patch, enabling non-canonical death receptor interactions and blocking surface expression of DR5.\",\n      \"method\": \"X-ray crystal structure at 2.1 Å, binding affinity assays\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution crystal structure with biochemical validation of binding affinities\",\n      \"pmids\": [\"23555243\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Phage display-identified peptides and synthetic antibodies binding DR5 share a conserved tripeptide motif (within a disulfide-constrained loop or CDR-H3); X-ray crystal structure of an antibody:DR5 complex confirmed this motif is buried at the interface. Oligomeric presentation of DR5-binding peptides/antibodies induces potent proapoptotic signaling.\",\n      \"method\": \"Phage display, X-ray crystallography of antibody:DR5 complex, cell-based apoptosis assays\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure combined with functional validation\",\n      \"pmids\": [\"16859704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Hepatitis B virus X protein (HBx) acts as an autophagy receptor-like molecule that directly binds TNFRSF10B/DR5 and recruits it to phagophores (LC3B-positive autophagosomes), leading to lysosomal (not proteasomal) degradation of DR5, thereby suppressing TRAIL-mediated apoptosis and aiding viral immune evasion.\",\n      \"method\": \"Co-immunoprecipitation, GST pulldown, LC3B tandem-fluorescence microscopy, pharmacological autophagy inhibition, LC3B siRNA knockdown, immunoblotting of patient liver tissues\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct protein-protein interaction confirmed by Co-IP and GST pulldown, supported by multiple orthogonal methods and patient tissue validation\",\n      \"pmids\": [\"27740879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The signal recognition particle (SRP) complex is selectively required for DR4- but not DR5-mediated apoptosis: SRP siRNA knockdown dramatically reduces cell-surface DR4 and inhibits DR4-dependent cell death, while having little effect on cell-surface DR5 levels or DR5-mediated apoptosis.\",\n      \"method\": \"siRNA library screen, flow cytometry for cell-surface receptor levels, cell viability apoptosis assays, stable knockdown cell lines\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — systematic siRNA screen with mechanistic follow-up establishing differential receptor regulation\",\n      \"pmids\": [\"15356269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"FLIP(L) can both inhibit and promote caspase-8 at the TRAIL-R2 DISC in a stoichiometry-dependent manner. FLIP(L) recruitment to the DISC requires caspase-8 despite its ability to interact with FADD alone. In the complete absence of FLIP(L), procaspase-8 activation at the TRAIL-R2 DISC has slower kinetics but ultimately greater apoptosis.\",\n      \"method\": \"DISC immunoprecipitation, caspase activity assays, FLIP stoichiometry manipulation, FLIP/caspase-8 genetic manipulation\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic DISC assembly model validated by multiple orthogonal biochemical approaches\",\n      \"pmids\": [\"32009295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The SCFSkp2 E3 ubiquitin ligase complex (containing Cullin-1 in its active NEDDylated form) interacts with both the DR5 pre-ligand association complex (PLAC) and the activated DISC. Processing of FLIP(L) to its p43-form at the TRAIL-R2 DISC enhances its interaction with co-localized SCFSkp2, leading to FLIP(L) ubiquitination and degradation, thereby modulating DR5-mediated apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, NEDDylation inhibitor (MLN4924), siRNA knockdown, ubiquitination assays\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP of DISC components with E3 ligase, supported by functional ubiquitination assays and genetic knockdown\",\n      \"pmids\": [\"32313199\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Senescent cancer cells upregulate DR5 and its ligand TRAIL via NF-κB signaling but are protected from death by increased cFLIP expression. CRISPR screens identified cFLIP loss as a vulnerability of senescent cancer cells. DR5 agonistic antibody activation combined with BRD2 inhibitor-mediated cFLIP suppression efficiently kills senescent cancer cells; adjacent non-senescent cells are also killed via a bystander cytokine-secretion mechanism.\",\n      \"method\": \"CRISPR/Cas9 genetic screens, DR5 agonistic antibody treatment, BRD2 inhibition, animal xenograft models\",\n      \"journal\": \"Nature cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide CRISPR screen combined with mechanistic validation and in vivo models\",\n      \"pmids\": [\"36414711\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CDK4/6 phosphorylate the p53 family member p73 at threonine 86, sequestering p73 in the cytoplasm. CDK4/6 inhibition causes p73 dephosphorylation and nuclear translocation, which transcriptionally activates DR5 (TNFRSF10B). DR5 induction then promotes immunogenic cancer cell death; DR5 deletion in cancer cells abrogates the sensitizing effects of CDK4/6 inhibitors on TRAIL, 5-FU, and anti-PD-1 therapy.\",\n      \"method\": \"CDK4/6 kinase assay, phospho-site mutagenesis, nuclear fractionation, transcription reporter assay, DR5 knockout in vitro and in vivo\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — kinase-substrate relationship established with mutagenesis, coupled with genetic deletion validation in vivo\",\n      \"pmids\": [\"35149588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"KIM1 (kidney injury molecule-1) binds directly to the extracellular domain (ECD) of DR5 (TNFRSF10B), promoting DR5 multimerization, activating the caspase cascade, and inducing renal tubular cell apoptosis during AKI. Upstream, transcription factor YY1 is downregulated upon injury and normally represses KIM1 transcription by binding its promoter. Blocking KIM1-DR5 interaction with designed peptides is reno-protective.\",\n      \"method\": \"Renal tubule-specific Kim1 knockout mouse, Co-immunoprecipitation of KIM1 with DR5, YY1 ChIP at KIM1 promoter, rationally designed blocking peptides, cisplatin and ischemia/reperfusion AKI models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO plus Co-IP plus ChIP plus functional blocking peptide validation in multiple in vivo models\",\n      \"pmids\": [\"37460623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Missense mutations of KILLER/DR5 in gastric cancers are loss-of-function: mutant DR5 proteins inhibit apoptotic cell death in transfection assays and tumors harboring DR5 mutations lack p53 mutations, indicating an independent mechanism of apoptosis escape.\",\n      \"method\": \"Mutation analysis of 43 gastric cancers, allelic loss analysis, transfection-based apoptosis assays of mutant DR5 constructs\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function confirmed by functional transfection assay, but single study\",\n      \"pmids\": [\"11677215\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The TRAIL-R2 (DR5) promoter lacks a canonical TATA-box but contains two functional Sp1-binding sites; a p53-binding site in intron 1 mediates p53-dependent transcriptional upregulation of DR5. The minimal promoter is within -198 to -116 upstream of the ATG.\",\n      \"method\": \"Promoter deletion analysis, reporter gene assays, identification of p53-response element in intron 1\",\n      \"journal\": \"Vitamins and hormones\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — promoter reporter assays with deletion mapping; single study\",\n      \"pmids\": [\"15110170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Small-molecule bioymifi directly targets DR5 extracellularly to induce DR5 clustering and aggregation on the cell surface, leading to caspase-dependent apoptosis in human cancer cells, acting as a single agent without requiring TRAIL.\",\n      \"method\": \"High-throughput chemical screen, structure-activity relationship studies, cell-based apoptosis assays, DR5 clustering microscopy\",\n      \"journal\": \"Nature chemical biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — compound:receptor direct interaction demonstrated with functional clustering and apoptosis assays, single lab\",\n      \"pmids\": [\"23292651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"DR5 mediates anoikis (detachment-induced apoptosis) in human colorectal carcinoma cells through the extrinsic apoptotic pathway: suspension culture increases DR5 and TRAIL expression, an antagonistic anti-DR5 antibody blocks caspase-8 activation, and DR5 or TRAIL siRNA knockdown inhibits anoikis. DR4 antibody or TRAIL-neutralizing antibody do not consistently reduce anoikis.\",\n      \"method\": \"Suspension culture anoikis model, antagonistic DR5 antibody treatment, siRNA knockdown of DR5 and TRAIL, caspase-8 cleavage assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal approaches (antibody blockade + siRNA) in the same cellular context, single lab\",\n      \"pmids\": [\"18245494\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DR5 assembles composite pro-apoptotic/pro-survival plasma membrane-proximal platforms within DR4-DR5-DcR2 hetero-oligomeric complexes; a single DR5 receptor suffices to propagate TRAIL signaling to both death and survival (NF-κB, PI3K/Akt, MAPK) pathways. FADD and procaspase-8 at these complexes also transduce non-apoptotic signaling, not exclusively pro-apoptotic signals.\",\n      \"method\": \"DISC immunoprecipitation, receptor-specific siRNA, dominant-negative constructs, signaling pathway assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic platform characterization using biochemical pulldowns and multiple siRNA conditions, single lab\",\n      \"pmids\": [\"29048428\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In mouse spermatogonial stem cells (SSCs), the Trp53-Trp53inp1-Tnfrsf10b (DR5) pathway mediates radiation-induced apoptosis via the extrinsic pathway; Tnfrsf10b deficiency (but not Bbc3/PUMA deficiency) rescues SSCs after irradiation, whereas Bbc3 mediates apoptosis in committed spermatogonia. Trp53inp1 upregulates Tnfrsf10b upon irradiation.\",\n      \"method\": \"Spermatogonial transplantation, genetic KO of Trp53/Bbc3/Tnfrsf10b in mice, irradiation dose-response\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis in relevant tissue-specific KO model, replicated across multiple genotypes\",\n      \"pmids\": [\"25358794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"DR5 is upregulated in neurons following transient global cerebral ischemia (while TRAIL is upregulated in astrocytes/microglia); treatment with soluble DR5 protein blocks endogenous TRAIL-DR5 interaction and reduces ischemic neuronal death, demonstrating that the TRAIL-DR5 axis mediates delayed neuronal apoptosis after ischemia.\",\n      \"method\": \"RT-PCR, immunohistochemistry, dual immunofluorescence, soluble DR5 pharmacological blockade in mouse ischemia model\",\n      \"journal\": \"Neurobiology of disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific expression profiling combined with functional blockade in vivo, single study\",\n      \"pmids\": [\"20359534\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Rottlerin upregulates DR5 expression (mRNA and protein) via a CHOP-dependent mechanism (CHOP-binding site in DR5 promoter is required) and independently of PKC-delta. DR5 upregulation is required for rottlerin-induced apoptosis, as DR5 siRNA attenuates cell death.\",\n      \"method\": \"siRNA knockdown of DR5, DR5 promoter reporter with CHOP-binding site mutation, PKC-delta siRNA and overexpression, Western blot and RT-PCR\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — promoter mutagenesis plus siRNA knockdown establishing mechanism, single lab\",\n      \"pmids\": [\"19037087\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"An ERV9-LTR inserted upstream of TNFRSF10B drives a distinct proapoptotic DR5 transcript in male germline cells; HDAC inhibitors reactivate this ERV9-LTR-driven TNFRSF10B expression in testicular cancer cells, and cell death upon HDAC inhibitor + TRAIL treatment depends on TNFRSF10B expression.\",\n      \"method\": \"3'RACE/next-generation sequencing, HDAC inhibitor treatment, siRNA/shRNA knockdown of TNFRSF10B, cell death assays\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genomic 3'RACE identification plus functional TNFRSF10B knockdown validation, single lab\",\n      \"pmids\": [\"26024393\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"YIPF2 physically interacts with both TNFRSF10B (DR5) and RAB8, and competes with RAB8 to prevent RAB8-mediated removal of DR5 from the plasma membrane to the cytoplasm, thereby maintaining high cell-surface DR5 levels and promoting chemotherapy-induced apoptosis in NSCLC cells.\",\n      \"method\": \"Co-immunoprecipitation of YIPF2/RAB8/DR5, flow cytometry of cell-surface DR5, siRNA knockdown, pemetrexed treatment\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP of three interacting proteins plus functional competition assay, single lab\",\n      \"pmids\": [\"32303681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"p53 selectively controls myeloma cell sensitivity to DR5-mediated (but not DR4-mediated) apoptosis: TP53 wild-type cells overexpress DR5; p53 activation (by nutlin-3a or melphalan) increases DR5 expression and lexatumumab (DR5 agonist) efficacy; p53 silencing decreases DR5 expression and induces resistance to lexatumumab, without affecting DR4 expression or sensitivity to mapatumumab.\",\n      \"method\": \"p53 siRNA, nutlin-3a pharmacological activation, Western blot for DR4/DR5, DR5/DR4 agonistic antibody treatment (lexatumumab/mapatumumab), primary myeloma cells\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic and pharmacological p53 manipulation with mechanistic readout in multiple cell types, single lab\",\n      \"pmids\": [\"22738917\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In pancreatic cancer cells, TRAIL signals predominantly through DR4 despite functional DR5 expression; TRAIL stimulates DR4-DR5 heterocomplexes in addition to DR4 and DR5 homocomplexes, but DR4-specific Fab fragment blockade abolishes most TRAIL-induced apoptosis. PKC inhibition enables DR5 to trigger apoptosis in response to TRAIL.\",\n      \"method\": \"DR4/DR5 receptor-specific Fab blockade, DISC immunoprecipitation, PKC inhibition, agonistic antibodies (mapatumumab/lexatumumab)\",\n      \"journal\": \"Journal of molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — DISC analysis plus receptor-specific blockade, single lab\",\n      \"pmids\": [\"20354842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"KPNB1 (importin β1) inhibition overcomes TRAIL resistance in glioblastoma cells by promoting ATF4-mediated DR5 upregulation (via UPR), enhancing DISC assembly, freeing Bax/Bak from Mcl-1, and downregulating FLIP through 4E-BP1-mediated translational suppression. KPNB1 also regulates nuclear import of DR5.\",\n      \"method\": \"KPNB1 siRNA and pharmacological inhibition, ATF4 siRNA, DISC immunoprecipitation, Western blot, caspase assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple siRNA-based mechanistic dissections converging on DR5 regulation, single lab\",\n      \"pmids\": [\"30742128\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TNFRSF10B (DR5/TRAIL-R2) is a death receptor that, upon TRAIL binding or clustering, homotrimerizes (or forms higher-order assemblies via transmembrane helix interactions) to recruit FADD and caspase-8 into a DISC—preferentially within lipid rafts—driving caspase-8 cleavage and extrinsic apoptosis; DR5 expression is transcriptionally activated by p53 (via an intronic response element) and p73 (dephosphorylated after CDK4/6 inhibition), regulated at the cell surface by YIPF2/RAB8 vesicle trafficking, targeted for lysosomal degradation by HBV HBx-mediated autophagy, and modulated at the DISC by FLIP(L) stoichiometry and SCFSkp2-dependent ubiquitination, while its transmembrane domain alone can drive ligand-independent higher-order clustering and signaling when ectodomain autoinhibition is relieved.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TNFRSF10B (DR5/TRAIL-R2) is a death receptor that transduces extrinsic apoptotic signals upon binding its ligand TRAIL or upon ligand-independent clustering when ectodomain autoinhibition is relieved. TRAIL binds DR5 with the highest affinity among TRAIL receptors (KD ≤ 2 nM at 37°C), triggering transmembrane helix-mediated higher-order oligomerization that recruits FADD and caspase-8 into a death-inducing signaling complex (DISC), preferentially assembled within lipid rafts; DISC composition is tuned by FLIP(L) stoichiometry—which can either accelerate or inhibit caspase-8 activation—and by SCFSkp2-dependent ubiquitination of processed FLIP(L) [PMID:10770955, PMID:30827683, PMID:19432816, PMID:32009295, PMID:32313199]. DR5 transcription is activated by p53 via an intronic response element, by CHOP via a promoter-binding site, and by dephosphorylated p73 following CDK4/6 inhibition, while cell-surface DR5 levels are maintained by YIPF2-mediated competition with RAB8 vesicle trafficking and reduced by HBV HBx-directed autophagic degradation [PMID:15110170, PMID:19037087, PMID:35149588, PMID:32303681, PMID:27740879]. Beyond canonical apoptosis in cancer cells and during anoikis, DR5 mediates tissue-specific cell death in spermatogonial stem cells after irradiation and in neurons following cerebral ischemia, and participates in dual pro-apoptotic/pro-survival signaling platforms formed with DR4 and DcR2 that activate NF-κB and MAPK pathways [PMID:25358794, PMID:20359534, PMID:29048428, PMID:16980609].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Establishing the quantitative ligand-receptor interaction hierarchy resolved which TRAIL receptor dominates signaling under physiological conditions: DR5 binds TRAIL with the highest affinity (KD ≤ 2 nM at 37°C) among all five receptors.\",\n      \"evidence\": \"Isothermal titration calorimetry and competitive ELISA at multiple temperatures\",\n      \"pmids\": [\"10770955\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Affinity measurements do not address how receptor density or co-receptor expression modulates effective signaling in vivo\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"The identification of loss-of-function DR5 missense mutations in gastric cancers established that DR5 acts as an independent tumor suppressor whose inactivation provides an alternative to p53 loss for apoptosis evasion.\",\n      \"evidence\": \"Mutational analysis of 43 gastric cancers with transfection-based functional assays of mutant DR5\",\n      \"pmids\": [\"11677215\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mutations characterized in a single cancer type\", \"No structural explanation for loss of function\", \"Not independently replicated in a second cohort\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Mapping the minimal promoter and intronic p53-response element resolved how DR5 is transcriptionally regulated and linked p53 status to DR5 expression, while the finding that SRP is dispensable for DR5 (but not DR4) surface delivery revealed distinct ER-trafficking routes for these homologous receptors.\",\n      \"evidence\": \"Promoter deletion/reporter assays for p53 element; siRNA library screen with flow cytometry for SRP requirement\",\n      \"pmids\": [\"15110170\", \"15356269\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Sp1 and p53 contributions not dissected under endogenous chromatin context\", \"Alternative DR5 ER-targeting mechanism not identified\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Delineation of decoy receptor mechanisms showed that DcR2 inhibits DR5 signaling by co-assembling into the DISC and blocking caspase activation, while DcR1 sequesters TRAIL in lipid rafts—two mechanistically distinct inhibitory strategies acting on the same receptor.\",\n      \"evidence\": \"DISC co-immunoprecipitation, lipid raft fractionation, and functional apoptosis assays\",\n      \"pmids\": [\"16980609\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometric requirements for DcR2 inhibition within the DISC not quantified\", \"In vivo relevance of lipid raft compartmentalization not tested\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"DR5 was established as the primary mediator of anoikis in colorectal carcinoma cells and its transcription was shown to be induced by CHOP via a promoter-binding site, expanding DR5 function beyond ligand-dependent killing to detachment-induced and ER-stress-linked apoptosis.\",\n      \"evidence\": \"Suspension culture with antagonistic DR5 antibody/siRNA blockade; CHOP-site promoter mutagenesis with rottlerin-induced DR5 upregulation\",\n      \"pmids\": [\"18245494\", \"19037087\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Anoikis role shown in one cell type\", \"Relative contributions of CHOP vs. p53 to DR5 induction under stress not compared\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"DISC biochemical analysis in glioblastoma demonstrated that DR5 homotrimerization and DISC assembly occur preferentially in lipid rafts, while TRAIL-resistant cells redirect the DISC to non-raft fractions enriched in c-FLIP, RIP, and PED/PEA-15, thereby switching output from caspase-8 activation to NF-κB signaling.\",\n      \"evidence\": \"DISC immunoprecipitation with lipid raft fractionation and siRNA rescue of caspase-8 cleavage\",\n      \"pmids\": [\"19432816\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism governing raft vs. non-raft DISC partitioning not identified\", \"Whether raft localization is a cause or consequence of resistance not fully resolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"DR5 was implicated in neuronal delayed apoptosis after cerebral ischemia (where neurons express DR5 and surrounding glia express TRAIL), and pancreatic cancer studies revealed DR4-DR5 heterocomplexes and PKC-dependent control of DR5 signaling competence, broadening DR5 biology to non-cancer contexts and heteromeric receptor assemblies.\",\n      \"evidence\": \"Soluble DR5 blockade in mouse ischemia model; DR4/DR5 receptor-specific Fab and DISC IP in pancreatic cancer cells\",\n      \"pmids\": [\"20359534\", \"20354842\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of PKC-mediated DR5 suppression unknown\", \"DR4-DR5 heterocomplex stoichiometry not determined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"p53 was shown to selectively control DR5 (but not DR4) expression and agonist sensitivity in myeloma, and the small molecule bioymifi was found to directly cluster DR5 extracellularly to trigger apoptosis without TRAIL, demonstrating that forced receptor clustering suffices for signaling.\",\n      \"evidence\": \"p53 siRNA/nutlin-3a with DR5 agonistic antibody in myeloma; high-throughput screen identifying bioymifi with DR5 clustering microscopy\",\n      \"pmids\": [\"22738917\", \"23292651\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Bioymifi binding site on DR5 not structurally resolved\", \"In vivo efficacy of bioymifi not demonstrated\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"The 2.1 Å crystal structure of HCMV UL141 bound to DR5 revealed how a viral immunoevasin blocks DR5 surface expression: a UL141 homodimer engages two DR5 monomers at a site overlapping the TRAIL-binding surface, defining a non-canonical DR5 interaction mode exploited for immune evasion.\",\n      \"evidence\": \"X-ray crystallography at 2.1 Å resolution with binding affinity assays\",\n      \"pmids\": [\"23555243\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether UL141 also affects intracellular DR5 trafficking not addressed\", \"Relevance to in vivo HCMV pathogenesis not tested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Genetic epistasis in mouse spermatogonial stem cells established that the p53–Trp53inp1–Tnfrsf10b axis mediates extrinsic-pathway apoptosis after irradiation in SSCs, whereas Bbc3/PUMA governs intrinsic apoptosis in committed spermatogonia, revealing cell-type-specific death receptor pathway usage.\",\n      \"evidence\": \"Spermatogonial transplantation in Trp53/Bbc3/Tnfrsf10b single and compound KO mice with irradiation\",\n      \"pmids\": [\"25358794\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which Trp53inp1 upregulates Tnfrsf10b not molecularly defined\", \"Whether human SSCs show the same pathway dependence is unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"HBV HBx was identified as an autophagy receptor-like molecule that directly binds DR5, recruits it to LC3B-positive autophagosomes, and targets it for lysosomal degradation—the first demonstration of selective autophagic degradation of a death receptor as a viral immune evasion strategy.\",\n      \"evidence\": \"Co-IP, GST pulldown, LC3B tandem-fluorescence microscopy, autophagy inhibition, and patient liver tissue validation\",\n      \"pmids\": [\"27740879\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Autophagy receptor motif in HBx mediating DR5 recognition not mapped\", \"Whether other death receptors are co-degraded not tested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"DR5 was shown to participate in composite hetero-oligomeric signaling platforms with DR4 and DcR2 that simultaneously engage pro-apoptotic (FADD/caspase-8) and pro-survival (NF-κB, PI3K/Akt, MAPK) outputs, establishing that a single DR5 receptor can propagate both death and survival signals.\",\n      \"evidence\": \"DISC immunoprecipitation with receptor-specific siRNA and dominant-negative constructs\",\n      \"pmids\": [\"29048428\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of heteromeric receptor assembly unknown\", \"Quantitative determinants of death vs. survival output balance not defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"NMR structure of the DR5 transmembrane helix revealed a dimer-of-trimers higher-order assembly that is necessary and sufficient for signaling; the unliganded ectodomain autoinhibits this clustering, and proteolytic ectodomain removal fully activates signaling without ligand—resolving the long-standing question of how TRAIL binding is transduced across the membrane.\",\n      \"evidence\": \"NMR in bicelles, site-directed TMH mutagenesis, ectodomain proteolytic removal functional assays\",\n      \"pmids\": [\"30827683\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length receptor structure in native membrane not available\", \"How ectodomain conformational change is transmitted to the TMH not resolved at atomic level\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"The DISC assembly mechanism was refined: FLIP(L) acts as a stoichiometry-dependent modulator—promoting initial caspase-8 activation at low ratios but inhibiting at high ratios—and the SCFSkp2 E3 ligase was found to ubiquitinate processed FLIP(L) at the DISC, providing a built-in mechanism for shifting the apoptotic threshold. Cell-surface DR5 levels were shown to be maintained by YIPF2 competing with RAB8-mediated internalization.\",\n      \"evidence\": \"DISC IP with FLIP stoichiometry manipulation; Cullin-1 NEDDylation inhibitor and Skp2 siRNA with ubiquitination assays; YIPF2/RAB8/DR5 Co-IP with flow cytometry\",\n      \"pmids\": [\"32009295\", \"32313199\", \"32303681\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of FLIP(L) stoichiometric switching unknown\", \"Whether SCFSkp2 modulation of FLIP occurs at all death receptor DISCs not tested\", \"YIPF2-RAB8 competition validated in one cell type\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"DR5 was placed at the nexus of senescence-associated vulnerability and CDK4/6-p73 transcriptional control: senescent cancer cells upregulate DR5 via NF-κB but are protected by cFLIP, while CDK4/6 inhibition dephosphorylates p73 to transcriptionally activate DR5 and promote immunogenic cell death—establishing DR5 as a pharmacologically exploitable node in therapy-induced senescence and combination immunotherapy.\",\n      \"evidence\": \"CRISPR screens in senescent cells with DR5 agonist/BRD2 inhibitor in xenografts; CDK4/6 kinase assay, p73 phospho-mutagenesis, DR5 KO in vivo\",\n      \"pmids\": [\"36414711\", \"35149588\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether p73-mediated DR5 induction operates in non-cancer tissues unknown\", \"Bystander killing mechanism via secreted cytokines not fully characterized\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"KIM1 was identified as a novel non-TRAIL ligand that binds the DR5 ectodomain, promotes DR5 multimerization, and activates caspase-dependent renal tubular apoptosis during acute kidney injury—extending DR5 function to a non-canonical ligand context in non-cancer tissue.\",\n      \"evidence\": \"Renal tubule-specific Kim1 KO mouse, Co-IP of KIM1-DR5, YY1 ChIP, blocking peptides in cisplatin and ischemia-reperfusion AKI models\",\n      \"pmids\": [\"37460623\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of KIM1-DR5 interaction not determined\", \"Whether KIM1-DR5 interaction occurs in tissues other than kidney not explored\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the full-length structure of DR5 in native membranes, the precise conformational mechanism by which ectodomain engagement releases TMH autoinhibition, the quantitative rules governing death-vs-survival signaling output from heteromeric DR4/DR5/DcR2 platforms, and whether non-canonical ligands such as KIM1 engage the same or distinct multimerization geometry as TRAIL.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No full-length DR5 structure in native membrane\", \"Ectodomain-to-TMH allosteric mechanism unresolved at atomic level\", \"Heteromeric receptor stoichiometry and signaling rules not quantified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [1, 2, 3, 5, 12, 15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 2, 3, 15, 22]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [6, 22]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [0, 3, 8, 9, 16, 18]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 10, 17]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [6, 11]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"complexes\": [\n      \"DISC (death-inducing signaling complex)\",\n      \"DR4-DR5-DcR2 hetero-oligomeric signaling platform\"\n    ],\n    \"partners\": [\n      \"FADD\",\n      \"CASP8\",\n      \"CFLAR\",\n      \"TNFSF10\",\n      \"TNFRSF10D\",\n      \"YIPF2\",\n      \"RAB8\",\n      \"HAVCR1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}