{"gene":"PDCD5","run_date":"2026-06-10T05:19:53","timeline":{"discoveries":[{"year":1999,"finding":"PDCD5 (TFAR19) is a novel apoptosis-promoting protein cloned from TF-1 leukemia cells undergoing apoptosis; overexpression enhances apoptosis triggered by growth factor or serum deprivation in tumor cells, establishing a direct pro-apoptotic role.","method":"cDNA-RDA cloning, overexpression in tumor cells, cell death assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single lab, overexpression functional assay without detailed pathway mechanism, but replicated by subsequent independent studies","pmids":["9920759"],"is_preprint":false},{"year":2001,"finding":"PDCD5 undergoes rapid nuclear translocation from cytoplasm to nucleus during apoptosis, preceding phosphatidylserine externalization and DNA fragmentation, and occurring in parallel with mitochondrial membrane potential loss; this translocation is independent of cell type and apoptotic stimulus.","method":"Immunofluorescence, subcellular fractionation, live-cell imaging in multiple cell lines with diverse apoptotic stimuli","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiments with functional timing established, single lab but multiple cell types and stimuli","pmids":["11741587"],"is_preprint":false},{"year":2002,"finding":"Introduction of anti-PDCD5 monoclonal antibody into HeLa cells by in situ electroporation suppresses the apoptosis-accelerating effect of endogenous PDCD5, demonstrating that endogenous PDCD5 is required for its pro-apoptotic function.","method":"In situ electroporation of antibody into living cells, flow cytometry apoptosis assay","journal":"Life sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — functional neutralization of endogenous protein with antibody, single lab, single method","pmids":["12151055"],"is_preprint":false},{"year":2002,"finding":"Recombinant TFAR19/PDCD5 protein facilitates opening of the mitochondrial permeability transition pore (PTP), decreases mitochondrial membrane potential, and promotes cytochrome c release in isolated mitochondria, indicating a direct functional role at the mitochondria.","method":"In vitro assay with isolated mitochondria, measurement of PTP opening, membrane potential, and cytochrome c release","journal":"Acta biochimica et biophysica Sinica","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro reconstitution assay with isolated mitochondria, single lab, single study","pmids":["12019438"],"is_preprint":false},{"year":2004,"finding":"Overexpression of TAJ/TROY (a TNF receptor superfamily member) induces paraptotic cell death, which is enhanced by PDCD5 overexpression; endogenous PDCD5 is upregulated in response to TAJ/TROY overexpression, placing PDCD5 as a regulator in both apoptotic and non-apoptotic programmed cell death.","method":"Overexpression in 293T cells, transmission electron microscopy, flow cytometry, co-expression assays","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — functional epistasis by co-overexpression, single lab","pmids":["15020679"],"is_preprint":false},{"year":2006,"finding":"siRNA knockdown of PDCD5 attenuates Bax-overexpression-induced apoptosis, inhibits caspase-3 activation, and reduces cytochrome c release from mitochondria; it also reduces Bax translocation from cytosol to mitochondria, placing PDCD5 upstream of the mitochondrial apoptosis pathway acting through Bax translocation.","method":"siRNA knockdown, Western blot, flow cytometry, cytochrome c fractionation, caspase-3 activity assay","journal":"Apoptosis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined cellular phenotype and multiple readouts, single lab","pmids":["16374546"],"is_preprint":false},{"year":2006,"finding":"Exogenous PDCD5 protein is taken up by cells via a clathrin-independent endocytic pathway involving heparan sulfate proteoglycan binding and lipid rafts; deletion mutagenesis mapped the translocation activity to residues 109–115 of PDCD5.","method":"Endocytosis assays with fluorescent PDCD5, clathrin dominant-negative mutant, lipid raft disruption drugs, sucrose density centrifugation, electron microscopy, deletion mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods (mutagenesis, dominant-negative, drug inhibition, fractionation, EM) in a single rigorous study","pmids":["16754680"],"is_preprint":false},{"year":2006,"finding":"PDCD5 binds heparin with a binding constant of 4.17×10⁴ M⁻¹ as determined by Scatchard analysis; PDCD5-related peptides also interact with heparin, consistent with heparan sulfate proteoglycan-mediated cell entry.","method":"Capillary zone electrophoresis (CZE), Scatchard analysis","journal":"Analytical and bioanalytical chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — quantitative in vitro binding assay, single lab, single method","pmids":["17165023"],"is_preprint":false},{"year":2009,"finding":"PDCD5 physically binds to Tip60 histone acetyltransferase (HAT); PDCD5 enhances Tip60 protein stability, increases Tip60 HAT activity, promotes Tip60-dependent histone acetylation, and increases Tip60-mediated K120 acetylation of p53. After UV irradiation the PDCD5–Tip60 complex increases and cooperatively accelerates DNA damage-induced apoptosis.","method":"Co-immunoprecipitation, GST-pulldown, HAT activity assays, Western blot for p53-K120 acetylation, siRNA knockdown, UV irradiation apoptosis assay","journal":"Neoplasia","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — reciprocal Co-IP, in vitro HAT assay, functional knockdown with multiple orthogonal methods in single rigorous study","pmids":["19308289"],"is_preprint":false},{"year":2009,"finding":"PDCD5 is phosphorylated by CK2 kinase at Ser118 both in vitro and in 293T cells; the non-phosphorylatable S118A mutant impairs PDCD5's ability to accelerate doxorubicin- or UV-induced apoptosis in U2OS cells.","method":"In vitro kinase assay with CK2α and holoenzyme, mass spectrometry identification of phospho-S118, transfection of S118A mutant, apoptosis assay","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro phosphorylation assay combined with site-directed mutagenesis and functional validation, single lab","pmids":["19616514"],"is_preprint":false},{"year":2009,"finding":"The yeast PDCD5 homolog Ymr074cP (N116 fragment) adopts a triple-helix bundle fold as determined by NMR; overexpression of Ymr074c promotes H₂O₂-induced apoptosis in yeast in both a metacaspase Yca1-dependent and Yca1-independent manner, and deletion of the N-terminal helix attenuates its pro-apoptotic activity.","method":"Heteronuclear NMR solution structure, spin-label experiments, yeast overexpression, Yca1 deletion epistasis","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structure with functional mutagenesis and genetic epistasis, single lab","pmids":["19469552"],"is_preprint":false},{"year":2012,"finding":"PDCD5 directly binds p53 (shown by GST-pulldown, co-immunoprecipitation, and co-localization); PDCD5 enhances p53 stability by antagonizing Mdm2-induced ubiquitination, nuclear export and proteasomal degradation, displaces p53 from the p53–Mdm2 complex, and directly promotes Mdm2 degradation. PDCD5 is also required for proper G1 arrest and p53 phosphorylation (Ser9, 20, 392) and p21 expression after DNA damage.","method":"GST-pulldown, co-immunoprecipitation, co-localization, ubiquitination assay, RNAi knockdown, chromatin immunoprecipitation (ChIP), cell cycle analysis","journal":"Apoptosis","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal biochemical methods (pulldown, Co-IP, ChIP, ubiquitination assay) with loss-of-function validation in single rigorous study","pmids":["22914926"],"is_preprint":false},{"year":2014,"finding":"DNAJB1 interacts with PDCD5 (identified by yeast two-hybrid, confirmed by Co-IP) via its D5 domain (Δ180-210) and induces ubiquitin-dependent proteasomal degradation of PDCD5, thereby inhibiting p53-mediated apoptosis; DNAJB1 knockdown increases etoposide-induced p53-pathway apoptosis in a PDCD5-dependent manner.","method":"Yeast two-hybrid screen, Co-IP, domain mapping, ubiquitination assay, siRNA knockdown, colony formation and apoptosis assays","journal":"Cancer letters","confidence":"High","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid validated by Co-IP, ubiquitination assay, and functional rescue, single lab with multiple orthogonal methods","pmids":["25444898"],"is_preprint":false},{"year":2014,"finding":"OTUD5 deubiquitinase binds PDCD5 in response to DNA damage (etoposide treatment) and stabilizes PDCD5 by deubiquitinating it at Lys-97/98; OTUD5-dependent PDCD5 stabilization is required for sequential p53 activation. PDCD5 mutants defective for OTUD5 interaction (E94D) or p53 interaction (E16D) fail to facilitate p53 activation.","method":"Co-immunoprecipitation, ubiquitination/deubiquitination assay, site-directed mutagenesis, knockdown and rescue experiments, apoptosis assays","journal":"Cancer letters","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — biochemical deubiquitination assay, site-specific mutagenesis, epistasis by knockdown with rescue, multiple orthogonal methods","pmids":["25499082"],"is_preprint":false},{"year":2015,"finding":"YAF2 (YY1-associated factor 2) binds PDCD5 (identified by yeast two-hybrid, confirmed by Co-IP) and stabilizes PDCD5 by blocking ubiquitin-dependent proteasomal degradation; YAF2 promotes p53 activation via PDCD5. PDCD5 mutants defective for YAF2 interaction (E4D) or p53 interaction (E16D) cannot rescue impaired apoptosis upon PDCD5 ablation.","method":"Yeast two-hybrid, Co-IP, ubiquitination assay, siRNA knockdown, domain mutagenesis, apoptosis assay","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid confirmed by Co-IP, mutagenesis and functional epistasis, single lab","pmids":["25603536"],"is_preprint":false},{"year":2015,"finding":"PDCD5 knockout in mice causes embryonic lethality at mid-gestation due to placental dysplasia (defective spongiotrophoblasts and trophoblast giant cells); PDCD5-knockout MEFs show increased apoptosis, G0/G1 arrest, and decreased VEGF/HGF and Pik3ca-Akt-mTOR pathway activity.","method":"Conditional knockout mouse model, histopathology, Western blot, cell cycle analysis","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 / Moderate — rigorous in vivo knockout with defined morphological and molecular phenotype, single lab","pmids":["28542142"],"is_preprint":false},{"year":2015,"finding":"PDCD5 interacts with FOXP3 and increases FOXP3 acetylation in synergy with Tip60, enhancing the repressive function of FOXP3 in regulatory T cells; PDCD5 transgenic mice show increased Treg frequency, enhanced TGF-β-induced Treg polarization, and reduced autoimmune encephalomyelitis severity.","method":"Co-immunoprecipitation, acetylation assay, PDCD5 transgenic mice, EAE model, T cell polarization assay, flow cytometry","journal":"Journal of autoimmunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, functional acetylation assay, and in vivo transgenic model with defined immune phenotype; multiple methods","pmids":["24012345"],"is_preprint":false},{"year":2017,"finding":"Serine/threonine phosphatase PPEF-1 physically interacts with PDCD5 and dephosphorylates it at Ser-119, leading to PDCD5 destabilization; catalytically inactive PPEF-1D172N does not suppress CK2α-mediated PDCD5 stabilization or p53-mediated apoptosis, demonstrating phosphatase activity is required.","method":"Co-immunoprecipitation, in vitro phosphatase assay, site-directed mutagenesis of PPEF-1 active site, Western blot stability assays, knockdown/overexpression apoptosis assays","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro phosphatase assay combined with catalytic-dead mutant and functional rescue, single lab","pmids":["28051100"],"is_preprint":false},{"year":2018,"finding":"T cell-specific PDCD5 deletion in mice abolishes the iNKT1 lineage by reducing T-bet expression in early thymic iNKT cells; PDCD5 stabilizes TOX2 (a high mobility group protein), which promotes permissive H3K4me3 modification at the Tbx21 (T-bet) promoter, linking PDCD5 to epigenetic regulation of iNKT1 fate.","method":"Conditional T cell Pdcd5 knockout mouse, flow cytometry, ChIP for H3K4me3, Co-immunoprecipitation of PDCD5-TOX2","journal":"Cellular & molecular immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo knockout with defined lineage phenotype, Co-IP, and ChIP-based epigenetic mechanism, single lab","pmids":["29921968"],"is_preprint":false},{"year":2018,"finding":"STK31 (serine/threonine kinase 31) interacts with PDCD5 and stabilizes PDCD5 protein; STK31 overexpression activates PDCD5-mediated p53 apoptotic signaling in response to etoposide, while STK31 depletion impairs this pathway in a PDCD5-dependent manner.","method":"Co-immunoprecipitation, Western blot stability assay, overexpression and knockdown with apoptosis assays, colony formation assay","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP with functional epistasis, single lab","pmids":["30144069"],"is_preprint":false},{"year":2019,"finding":"Lgr5 directly binds PDCD5 via its N-terminal extracellular domain (shown by Co-IP and GST-pulldown); Lgr5 blocks nuclear translocation of PDCD5, thereby preventing PDCD5-dependent p53 stabilization and causing p53 degradation, leading to doxorubicin resistance in hepatocellular carcinoma.","method":"Yeast two-hybrid, Co-IP, GST-pulldown, nuclear/cytoplasmic fractionation, ubiquitination assay, in vitro and in vivo chemoresistance assays","journal":"Theranostics","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — yeast two-hybrid confirmed by reciprocal Co-IP and GST-pulldown, nuclear fractionation, multiple orthogonal methods","pmids":["31244936"],"is_preprint":false},{"year":2024,"finding":"Cryo-electron tomography in human cells reveals that PDCD5 specifically binds to the open (but not closed) state of the TRiC/CCT chaperonin complex, at a position compatible with both substrate and prefoldin binding, suggesting PDCD5 is a state-specific cofactor of TRiC.","method":"Cryo-electron tomography (in situ), structural analysis of TRiC states in intact human cells","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — in-cell cryo-ET structural study identifying state-selective binding, single study but highest-resolution in-cell approach","pmids":["39663456"],"is_preprint":false},{"year":2025,"finding":"PDCD5 is required for flagellum biogenesis in spermatids and ciliogenesis in mouse ciliated cells; structural studies show PDCD5 interacts with open-state TRiC and promotes substrate release by competing with PhLP2A for TRiC binding; PDCD5 depletion traps flagellum- and cilium-associated proteins inside TRiC. The C-terminus of PDCD5 is required for TRiC interaction and this function.","method":"Mouse PDCD5 knockout, cryo-EM structures of PDCD5-TRiC at near-atomic resolution, competitive binding assay (PDCD5 vs. PhLP2A), mass spectrometry of trapped TRiC substrates, C-terminal deletion mutagenesis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — near-atomic cryo-EM structure, in vivo knockout phenotype, competitive biochemical assay, and domain mutagenesis in single rigorous study","pmids":["41506263"],"is_preprint":false},{"year":2025,"finding":"PDCD5 interaction with PRDM9 promotes nuclear translocation and lysine methyltransferase activity of PRDM9, leading to H3K4me3 modification of effector-phenotype genes (including Tbx21) in CD8+ T cells; Pdcd5 deletion impairs CD8+ effector T cell differentiation and chromatin accessibility at Tbx21 and its target genes without affecting T cell activation, metabolic reprogramming, or memory/exhaustion.","method":"Conditional Pdcd5 knockout in T cells, Co-immunoprecipitation of PDCD5-PRDM9, ChIP for H3K4me3 and chromatin accessibility (ATAC-seq), chronic viral infection mouse model","journal":"European journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo knockout with defined phenotype, Co-IP, ChIP/ATAC-seq epigenetic mechanism, single lab with multiple orthogonal methods","pmids":["40111008"],"is_preprint":false},{"year":2025,"finding":"PDCD5 contributes to airway epithelial cell damage via the mitochondrial pathway; PDCD5 silencing attenuates cigarette smoke extract (CSE)-induced mitochondrial ROS accumulation, mitochondrial membrane potential loss, intracellular ATP depletion, and mitochondrial structural damage in airway epithelial cells.","method":"siRNA knockdown, ROS measurement, JC-1 membrane potential assay, ATP measurement, transmission electron microscopy, apoptosis assay","journal":"The Kaohsiung journal of medical sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — loss-of-function with multiple mitochondrial readouts, single lab","pmids":["41447117"],"is_preprint":false},{"year":2025,"finding":"JMJD4 directly interacts with PDCD5 (identified by LC-MS, confirmed by Co-IP) and negatively regulates PDCD5 protein levels, thereby suppressing the PDCD5-TP53 apoptotic pathway and promoting cancer cell proliferation and chemo-resistance.","method":"Liquid chromatography–mass spectrometry (LC-MS) interactome, Co-immunoprecipitation, Western blot, colony-formation assay, apoptosis assay","journal":"BMB reports","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — LC-MS confirmed by Co-IP with functional assays, single lab","pmids":["39567206"],"is_preprint":false},{"year":2015,"finding":"A study using conditional shRNA ablation of PDCD5 in multiple cell types found that PDCD5 was dispensable for DNA damage-induced apoptosis and cell cycle arrest; while PDCD5–p53 interaction was confirmed, PDCD5–Tip60 interaction could not be confirmed in these cell lines. This constitutes a NEGATIVE finding challenging the universality of PDCD5 as a rate-limiting factor in the DNA damage response.","method":"Conditional shRNA cell lines, apoptosis assay after genotoxic stress, Co-IP for PDCD5–p53 and PDCD5–Tip60","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — rigorous loss-of-function in multiple cell lines with negative result for apoptosis rate-limiting role and for Tip60 interaction; single lab","pmids":["26062895"],"is_preprint":false}],"current_model":"PDCD5 is a pro-apoptotic protein that, in response to stress signals, undergoes nuclear translocation and stabilizes p53 by competing with Mdm2 and promoting Mdm2 degradation; it co-activates Tip60 HAT activity to acetylate p53-K120, is stabilized post-translationally by deubiquitination via OTUD5 (at K97/98), by YAF2 and STK31, and is destabilized by DNAJB1-mediated ubiquitination and PPEF-1-mediated dephosphorylation at Ser119 (CK2 phosphorylation at Ser118 being activating); it also promotes mitochondrial apoptosis by facilitating Bax translocation and cytochrome c release; outside apoptosis, PDCD5 binds the open state of the TRiC chaperonin complex via its C-terminus and promotes substrate release by competing with PhLP2A, a function essential for flagellum biogenesis and ciliogenesis, while in T cells it stabilizes TOX2 and PRDM9 to drive H3K4me3 epigenetic programming of T-bet (Tbx21), determining iNKT1 and CD8+ effector T cell fate."},"narrative":{"mechanistic_narrative":"PDCD5 is a stress-responsive regulatory protein with dual roles as a pro-apoptotic effector and a state-specific cofactor of the TRiC/CCT chaperonin [PMID:9920759, PMID:39663456]. In its apoptotic role, PDCD5 rapidly translocates from cytoplasm to nucleus early in apoptosis, preceding phosphatidylserine externalization and DNA fragmentation [PMID:11741587], where it operates as a positive regulator of the p53 pathway: it binds p53 directly, antagonizes Mdm2-mediated ubiquitination and nuclear export, displaces p53 from the p53–Mdm2 complex, promotes Mdm2 degradation, and is required for p53 phosphorylation, p21 induction, and G1 arrest after DNA damage [PMID:22914926]. PDCD5 also binds and stabilizes the Tip60 acetyltransferase, enhancing Tip60-mediated K120 acetylation of p53 and cooperatively accelerating DNA damage-induced apoptosis [PMID:19308289]. In parallel it engages the mitochondrial apoptotic axis, facilitating Bax translocation, permeability transition pore opening, and cytochrome c release [PMID:12019438, PMID:16374546]. PDCD5 abundance is set by an extensive post-translational network: CK2 phosphorylation at Ser118 is activating [PMID:19616514], whereas PPEF-1 dephosphorylation at Ser119 destabilizes it [PMID:28051100]; OTUD5 deubiquitinates PDCD5 at K97/98 and YAF2 and STK31 block its proteasomal turnover to enable p53 activation [PMID:25499082, PMID:25603536, PMID:30144069], while DNAJB1 and JMJD4 promote its degradation [PMID:25444898, PMID:39567206]. Lgr5 sequesters PDCD5 from the nucleus to blunt p53 stabilization and confer chemoresistance [PMID:31244936]. Distinct from apoptosis, PDCD5 binds the open state of TRiC via its C-terminus and promotes folded-substrate release by competing with PhLP2A, a function essential for flagellum biogenesis and ciliogenesis [PMID:39663456, PMID:41506263]. In the immune system PDCD5 directs T-cell fate epigenetically by stabilizing TOX2 and activating PRDM9 to deposit permissive H3K4me3 at the Tbx21 (T-bet) locus, programming iNKT1 and CD8+ effector differentiation [PMID:29921968, PMID:40111008], and it cooperates with Tip60 to acetylate FOXP3 in regulatory T cells [PMID:24012345]. PDCD5 is essential in development, as germline knockout causes mid-gestation embryonic lethality from placental dysplasia [PMID:28542142].","teleology":[{"year":1999,"claim":"Established PDCD5 as a bona fide pro-apoptotic gene, defining the founding functional hypothesis for all subsequent mechanism.","evidence":"cDNA-RDA cloning from apoptotic leukemia cells and overexpression death assays in tumor cells","pmids":["9920759"],"confidence":"Medium","gaps":["Overexpression-only; no endogenous mechanism","No molecular partner identified"]},{"year":2001,"claim":"Resolved when and where PDCD5 acts by showing stimulus-independent nuclear translocation that precedes downstream apoptotic hallmarks, implying an early regulatory step.","evidence":"Immunofluorescence, subcellular fractionation and live imaging across multiple cell lines and stimuli","pmids":["11741587"],"confidence":"Medium","gaps":["Translocation trigger and nuclear target unknown at the time","Does not establish causality versus correlation with apoptosis"]},{"year":2002,"claim":"Demonstrated endogenous PDCD5 is required, not merely sufficient, for apoptosis acceleration, and placed it functionally at the mitochondrion.","evidence":"Intracellular anti-PDCD5 antibody electroporation and in vitro isolated-mitochondria PTP/cytochrome c assays","pmids":["12151055","12019438"],"confidence":"Medium","gaps":["Mechanism of mitochondrial action undefined","No direct mitochondrial protein partner identified"]},{"year":2006,"claim":"Defined how exogenous PDCD5 enters cells, mapping a heparan-sulfate/lipid-raft uptake route and the residues 109-115 translocation determinant relevant to its candidate therapeutic delivery.","evidence":"Endocytosis assays with dominant-negatives, raft disruption, EM and deletion mutagenesis; heparin-binding quantification by capillary electrophoresis","pmids":["16754680","17165023"],"confidence":"High","gaps":["Physiological relevance of cell entry versus intracellular function unclear","Receptor identity beyond HSPG not defined"]},{"year":2006,"claim":"Positioned PDCD5 upstream of the mitochondrial apoptotic core by showing it is required for Bax translocation, cytochrome c release and caspase-3 activation.","evidence":"siRNA knockdown with cytochrome c fractionation, caspase assays and Bax localization in Bax-overexpression apoptosis","pmids":["16374546"],"confidence":"Medium","gaps":["Direct biochemical link between PDCD5 and Bax not shown","Endogenous-stimulus dependence not tested"]},{"year":2009,"claim":"Identified the first chromatin-level effector mechanism: PDCD5 stabilizes and activates Tip60 to acetylate p53-K120, coupling PDCD5 to the DNA damage response.","evidence":"Reciprocal Co-IP, GST-pulldown, in vitro HAT assays and UV-irradiation apoptosis with knockdown","pmids":["19308289"],"confidence":"High","gaps":["Whether Tip60 binding is universal across cell types unresolved","Structural basis of Tip60 stabilization unknown"]},{"year":2009,"claim":"Established phospho-regulation of PDCD5 activity, showing CK2 phosphorylation of Ser118 is required for its apoptosis-accelerating function.","evidence":"In vitro CK2 kinase assay, mass-spec phosphosite mapping and S118A mutant apoptosis assays; yeast homolog NMR triple-helix structure with pro-apoptotic mutagenesis","pmids":["19616514","19469552"],"confidence":"High","gaps":["How Ser118 phosphorylation alters PDCD5 behavior mechanistically not defined","Human full-length structure not solved"]},{"year":2012,"claim":"Delineated the core p53-stabilizing mechanism: PDCD5 binds p53, antagonizes Mdm2-mediated ubiquitination/export, and drives Mdm2 degradation, explaining its DNA-damage checkpoint role.","evidence":"GST-pulldown, Co-IP, ubiquitination assays, ChIP, RNAi and cell-cycle analysis","pmids":["22914926"],"confidence":"High","gaps":["Mechanism by which PDCD5 promotes Mdm2 degradation not fully defined","Direct versus indirect competition for p53 not structurally resolved"]},{"year":2014,"claim":"Opened the post-translational stability axis, identifying DNAJB1 as a destabilizer and OTUD5 as a DNA-damage-induced deubiquitinase that stabilizes PDCD5 at K97/98 to license sequential p53 activation.","evidence":"Yeast two-hybrid, Co-IP, ubiquitination/deubiquitination assays, site-directed mutants and rescue apoptosis assays","pmids":["25444898","25499082"],"confidence":"High","gaps":["Upstream signals controlling OTUD5/DNAJB1 engagement unclear","Quantitative contribution of each regulator in vivo not established"]},{"year":2015,"claim":"Expanded the stabilizer network (YAF2) and revealed essential developmental and immunoregulatory functions, including embryonic lethality from placental dysplasia and FOXP3 acetylation in Tregs.","evidence":"Yeast two-hybrid/Co-IP for YAF2, conditional knockout mouse with histopathology, and transgenic mouse EAE/Treg polarization studies","pmids":["25603536","28542142","24012345"],"confidence":"High","gaps":["Whether placental phenotype reflects p53 or apoptosis-independent roles unresolved","Tissue-specific requirement versus systemic role not separated"]},{"year":2015,"claim":"Provided a contrasting negative result, finding PDCD5 dispensable for DNA-damage apoptosis in several lines and failing to confirm the Tip60 interaction, qualifying the universality of the p53/Tip60 model.","evidence":"Conditional shRNA ablation across cell types with genotoxic-stress apoptosis assays and Co-IP","pmids":["26062895"],"confidence":"Medium","gaps":["Cell-type context dependence not reconciled with positive studies","Does not exclude redundancy masking a requirement"]},{"year":2017,"claim":"Closed the phospho-regulatory loop by identifying PPEF-1 as the phosphatase that dephosphorylates Ser119 to destabilize PDCD5, counterbalancing CK2.","evidence":"Co-IP, in vitro phosphatase assay, catalytic-dead PPEF-1 mutant and stability/apoptosis assays","pmids":["28051100"],"confidence":"High","gaps":["Relationship between Ser118 and Ser119 phospho-states not integrated","Upstream control of PPEF-1 activity unknown"]},{"year":2018,"claim":"Revealed an epigenetic effector mechanism in immunity: PDCD5 stabilizes TOX2 to deposit H3K4me3 at the Tbx21 promoter, controlling iNKT1 lineage fate via T-bet.","evidence":"T-cell-specific Pdcd5 knockout, flow cytometry, H3K4me3 ChIP and PDCD5-TOX2 Co-IP","pmids":["29921968"],"confidence":"High","gaps":["Whether TOX2 stabilization uses the same machinery as p53 regulation unknown","Direct biochemical mechanism of histone-mark deposition not shown"]},{"year":2018,"claim":"Added STK31 as a stabilizing kinase-family interactor that activates PDCD5-mediated p53 apoptotic signaling.","evidence":"Co-IP, stability Western blots and PDCD5-dependent apoptosis epistasis","pmids":["30144069"],"confidence":"Medium","gaps":["Whether STK31 phosphorylates PDCD5 directly not tested","Single-lab Co-IP without reciprocal validation"]},{"year":2019,"claim":"Identified Lgr5 as a sequestering partner that blocks PDCD5 nuclear translocation to suppress p53 and confer hepatocellular carcinoma chemoresistance, linking PDCD5 regulation to drug response.","evidence":"Yeast two-hybrid, reciprocal Co-IP/GST-pulldown, fractionation and in vitro/in vivo chemoresistance assays","pmids":["31244936"],"confidence":"High","gaps":["Stoichiometry and dynamics of Lgr5-PDCD5 sequestration not quantified","Generality across tumor types untested"]},{"year":2024,"claim":"Reframed PDCD5 beyond apoptosis by showing it is a state-selective cofactor that binds the open TRiC/CCT chaperonin at a position overlapping substrate and prefoldin sites.","evidence":"In-cell cryo-electron tomography resolving TRiC conformational states in human cells","pmids":["39663456"],"confidence":"High","gaps":["Functional consequence of TRiC binding not established in this study","Link between chaperonin and apoptotic roles unclear"]},{"year":2025,"claim":"Defined the chaperonin mechanism and its physiology: PDCD5 promotes TRiC substrate release by competing with PhLP2A via its C-terminus, a step essential for flagellum and ciliary biogenesis.","evidence":"Mouse knockout, near-atomic cryo-EM of PDCD5-TRiC, PDCD5-vs-PhLP2A competition assay, mass-spec of trapped substrates and C-terminal deletion","pmids":["41506263"],"confidence":"High","gaps":["How a single protein serves both nuclear/apoptotic and chaperonin roles unresolved","Substrate spectrum of PDCD5-dependent release incompletely defined"]},{"year":2025,"claim":"Extended the epigenetic-programming theme to PRDM9 and CD8+ effector fate, and added new apoptotic regulators (JMJD4) and a mitochondrial role in airway injury, broadening PDCD5's functional reach.","evidence":"Conditional Pdcd5 knockout, PDCD5-PRDM9 Co-IP, ChIP/ATAC-seq; LC-MS/Co-IP for JMJD4; siRNA with mitochondrial ROS/membrane-potential readouts in airway cells","pmids":["40111008","39567206","41447117"],"confidence":"High","gaps":["Whether PRDM9/TOX2 epigenetic pathways converge mechanistically unknown","JMJD4 and airway findings are single-lab with limited orthogonal validation"]},{"year":null,"claim":"It remains unresolved how PDCD5's nuclear p53/apoptotic activity, its TRiC chaperonin cofactor function, and its epigenetic T-cell programming are mechanistically and structurally partitioned within one small protein.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified structural model reconciling the distinct interaction surfaces","Signals that route PDCD5 between these functions are unknown","Relative physiological weighting of each role across tissues undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[11,8,22]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[11,22,18]},{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[21,22]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[6,7]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,11,20]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1,5]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[3,5,24]}],"pathway":[{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[0,5,11]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[21,22]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[16,18,23]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[8,18,23]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and 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Yi xue ban = Journal of Peking University. 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Medical sciences = Hua zhong ke ji da xue xue bao. Yi xue Ying De wen ban = Huazhong keji daxue xuebao. Yixue Yingdewen ban","url":"https://pubmed.ncbi.nlm.nih.gov/22282256","citation_count":4,"is_preprint":false},{"pmid":"34936294","id":"PMC_34936294","title":"MiR-10b-3p Protects Cerebral I/R Injury through Targeting Programmed Cell Death 5 (PDCD5).","date":"2021","source":"Critical reviews in eukaryotic gene expression","url":"https://pubmed.ncbi.nlm.nih.gov/34936294","citation_count":4,"is_preprint":false},{"pmid":"27034262","id":"PMC_27034262","title":"The roles of serum PDCD5 in circulating CD133 positive cells of the patients with gastric cancer.","date":"2016","source":"Tumour biology : the journal of the International Society for Oncodevelopmental Biology and Medicine","url":"https://pubmed.ncbi.nlm.nih.gov/27034262","citation_count":4,"is_preprint":false},{"pmid":"12903389","id":"PMC_12903389","title":"[Preparation and identification of monoclonal antibodies against human apoptosis-related protein TFAR19].","date":"2000","source":"Zhongguo yi xue ke xue yuan xue bao. Acta Academiae Medicinae Sinicae","url":"https://pubmed.ncbi.nlm.nih.gov/12903389","citation_count":3,"is_preprint":false},{"pmid":"26617773","id":"PMC_26617773","title":"Establishment of stable multiple myeloma cell line with overexpressed PDCD5 and its proapoptosis mechanism.","date":"2015","source":"International journal of clinical and experimental pathology","url":"https://pubmed.ncbi.nlm.nih.gov/26617773","citation_count":3,"is_preprint":false},{"pmid":"30197523","id":"PMC_30197523","title":"Synergistic antitumoral efficacy of a novel replicative adenovirus SG611-PDCD5 and daunorubicin in human leukemic cells.","date":"2018","source":"OncoTargets and therapy","url":"https://pubmed.ncbi.nlm.nih.gov/30197523","citation_count":3,"is_preprint":false},{"pmid":"17605845","id":"PMC_17605845","title":"[Abnormal expression of PDCD5 in the bone marrow cells of adult acute myeloid leukemia].","date":"2007","source":"Zhongguo shi yan xue ye xue za zhi","url":"https://pubmed.ncbi.nlm.nih.gov/17605845","citation_count":3,"is_preprint":false},{"pmid":"40111008","id":"PMC_40111008","title":"Epigenetic Regulation of CD8+ Effector T Cell Differentiation by PDCD5.","date":"2025","source":"European journal of immunology","url":"https://pubmed.ncbi.nlm.nih.gov/40111008","citation_count":2,"is_preprint":false},{"pmid":"31638427","id":"PMC_31638427","title":"Clinicopathological Significance of Decreased Expression of the Tumor Inhibitor Gene PDCD5 in Osteoclastoma.","date":"2019","source":"Genetic testing and molecular biomarkers","url":"https://pubmed.ncbi.nlm.nih.gov/31638427","citation_count":2,"is_preprint":false},{"pmid":"18812660","id":"PMC_18812660","title":"[Expression of PDCD5 in multiple myeloma and its relation with BCL-2].","date":"2008","source":"Zhong nan da xue xue bao. Yi xue ban = Journal of Central South University. Medical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/18812660","citation_count":2,"is_preprint":false},{"pmid":"17393091","id":"PMC_17393091","title":"Effects of TFAR19 gene on the in vivo biorheological properties and pathogenicity of mouse erythroleukemia cell line MEL.","date":"2007","source":"Science in China. Series C, Life sciences","url":"https://pubmed.ncbi.nlm.nih.gov/17393091","citation_count":2,"is_preprint":false},{"pmid":"16086069","id":"PMC_16086069","title":"[Expressions of PDCD5 and p53 in oral leukoplakia and oral squamous cell carcinoma].","date":"2005","source":"Beijing da xue xue bao. Yi xue ban = Journal of Peking University. Health sciences","url":"https://pubmed.ncbi.nlm.nih.gov/16086069","citation_count":2,"is_preprint":false},{"pmid":"18763144","id":"PMC_18763144","title":"Effects of TFAR19 gene on the growth and biorheological properties of mouse erythroleukemia cell line MEL.","date":"2003","source":"Science in China. Series C, Life sciences","url":"https://pubmed.ncbi.nlm.nih.gov/18763144","citation_count":2,"is_preprint":false},{"pmid":"12578691","id":"PMC_12578691","title":"[Expression of TFAR19 in Apoptotic Processes of Jurkat Cells Induced with Various Methods].","date":"2000","source":"Zhongguo shi yan xue ye xue za zhi","url":"https://pubmed.ncbi.nlm.nih.gov/12578691","citation_count":2,"is_preprint":false},{"pmid":"14601303","id":"PMC_14601303","title":"[Characterization of programmed cell death 5 (PDCD5) gene in human cartilage and its possible significance].","date":"2003","source":"Beijing da xue xue bao. Yi xue ban = Journal of Peking University. Health sciences","url":"https://pubmed.ncbi.nlm.nih.gov/14601303","citation_count":2,"is_preprint":false},{"pmid":"20693715","id":"PMC_20693715","title":"[Effect of human recombinant PDCD5 protein on cell apoptosis of multiple myeloma KM3 cells induced by dexamethasone and its mechanism].","date":"2010","source":"Zhong nan da xue xue bao. Yi xue ban = Journal of Central South University. Medical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/20693715","citation_count":2,"is_preprint":false},{"pmid":"20416151","id":"PMC_20416151","title":"[Sensitizing effect of recombinant human PDCD5 protein on chemotherapy of acute monocytic leukemia cell line U937 and its mechanism].","date":"2010","source":"Zhongguo shi yan xue ye xue za zhi","url":"https://pubmed.ncbi.nlm.nih.gov/20416151","citation_count":2,"is_preprint":false},{"pmid":"41447117","id":"PMC_41447117","title":"PDCD5 Contributes to Airway Epithelial Cell Damage via Mitochondrial Pathway and Participates in COPD Pathogenesis.","date":"2025","source":"The Kaohsiung journal of medical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/41447117","citation_count":1,"is_preprint":false},{"pmid":"39567206","id":"PMC_39567206","title":"JMJD4 promotes tumor progression via inhibition of the PDCD5-TP53 pathway.","date":"2025","source":"BMB reports","url":"https://pubmed.ncbi.nlm.nih.gov/39567206","citation_count":1,"is_preprint":false},{"pmid":"22177044","id":"PMC_22177044","title":"[Expression of PDCD5 and caspase 3 in the cochlea of different age of C57BL/6J mice].","date":"2011","source":"Zhonghua er bi yan hou tou jing wai ke za zhi = Chinese journal of otorhinolaryngology head and neck surgery","url":"https://pubmed.ncbi.nlm.nih.gov/22177044","citation_count":1,"is_preprint":false},{"pmid":"32578164","id":"PMC_32578164","title":"NMR resonance assignments of the programmed cell death protein 5 (PDCD5) from Toxoplasma gondii.","date":"2020","source":"Biomolecular NMR assignments","url":"https://pubmed.ncbi.nlm.nih.gov/32578164","citation_count":1,"is_preprint":false},{"pmid":"15932730","id":"PMC_15932730","title":"[The effect of carvedilol on apoptosis gene PDCD5 expression in chronic heart failure patients].","date":"2005","source":"Zhonghua yi xue za zhi","url":"https://pubmed.ncbi.nlm.nih.gov/15932730","citation_count":1,"is_preprint":false},{"pmid":"15250154","id":"PMC_15250154","title":"[FTIR spectroscopy studies on the apoptosis-promoting effect of TFAR19 on the erythroleukemia cell line MEL].","date":"2004","source":"Sheng wu yi xue gong cheng xue za zhi = Journal of biomedical engineering = Shengwu yixue gongchengxue zazhi","url":"https://pubmed.ncbi.nlm.nih.gov/15250154","citation_count":1,"is_preprint":false},{"pmid":"12947547","id":"PMC_12947547","title":"[In silico data mining of the human programmed cell death 5 (PDCD5) sequences].","date":"2003","source":"Beijing da xue xue bao. Yi xue ban = Journal of Peking University. Health sciences","url":"https://pubmed.ncbi.nlm.nih.gov/12947547","citation_count":1,"is_preprint":false},{"pmid":"41506263","id":"PMC_41506263","title":"PDCD5 promotes substrate release from the TRiC complex in cilia and flagella.","date":"2026","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/41506263","citation_count":0,"is_preprint":false},{"pmid":"37528307","id":"PMC_37528307","title":"PDCD5 as a Potential Biomarker for Improved Prediction of the Incidence and Remission for Patients with Rheumatoid Arthritis.","date":"2023","source":"Rheumatology and therapy","url":"https://pubmed.ncbi.nlm.nih.gov/37528307","citation_count":0,"is_preprint":false},{"pmid":"39526719","id":"PMC_39526719","title":"Association of overexpression of PLD6, CHRAC1 and PDCD5 with type 2 diabetes mellitus.","date":"2024","source":"Medicinski glasnik : official publication of the Medical Association of Zenica-Doboj Canton, Bosnia and Herzegovina","url":"https://pubmed.ncbi.nlm.nih.gov/39526719","citation_count":0,"is_preprint":false},{"pmid":"25687040","id":"PMC_25687040","title":"[Expression and clinical significance of PDCD5 in patients with acute myeloid leukemia].","date":"2015","source":"Zhongguo shi yan xue ye xue za zhi","url":"https://pubmed.ncbi.nlm.nih.gov/25687040","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50022,"output_tokens":6774,"usd":0.125838,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":15754,"output_tokens":5942,"usd":0.11366,"stage2_stop_reason":"end_turn"},"total_usd":0.239498,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"PDCD5 (TFAR19) is a novel apoptosis-promoting protein cloned from TF-1 leukemia cells undergoing apoptosis; overexpression enhances apoptosis triggered by growth factor or serum deprivation in tumor cells, establishing a direct pro-apoptotic role.\",\n      \"method\": \"cDNA-RDA cloning, overexpression in tumor cells, cell death assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single lab, overexpression functional assay without detailed pathway mechanism, but replicated by subsequent independent studies\",\n      \"pmids\": [\"9920759\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"PDCD5 undergoes rapid nuclear translocation from cytoplasm to nucleus during apoptosis, preceding phosphatidylserine externalization and DNA fragmentation, and occurring in parallel with mitochondrial membrane potential loss; this translocation is independent of cell type and apoptotic stimulus.\",\n      \"method\": \"Immunofluorescence, subcellular fractionation, live-cell imaging in multiple cell lines with diverse apoptotic stimuli\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiments with functional timing established, single lab but multiple cell types and stimuli\",\n      \"pmids\": [\"11741587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Introduction of anti-PDCD5 monoclonal antibody into HeLa cells by in situ electroporation suppresses the apoptosis-accelerating effect of endogenous PDCD5, demonstrating that endogenous PDCD5 is required for its pro-apoptotic function.\",\n      \"method\": \"In situ electroporation of antibody into living cells, flow cytometry apoptosis assay\",\n      \"journal\": \"Life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — functional neutralization of endogenous protein with antibody, single lab, single method\",\n      \"pmids\": [\"12151055\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Recombinant TFAR19/PDCD5 protein facilitates opening of the mitochondrial permeability transition pore (PTP), decreases mitochondrial membrane potential, and promotes cytochrome c release in isolated mitochondria, indicating a direct functional role at the mitochondria.\",\n      \"method\": \"In vitro assay with isolated mitochondria, measurement of PTP opening, membrane potential, and cytochrome c release\",\n      \"journal\": \"Acta biochimica et biophysica Sinica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro reconstitution assay with isolated mitochondria, single lab, single study\",\n      \"pmids\": [\"12019438\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Overexpression of TAJ/TROY (a TNF receptor superfamily member) induces paraptotic cell death, which is enhanced by PDCD5 overexpression; endogenous PDCD5 is upregulated in response to TAJ/TROY overexpression, placing PDCD5 as a regulator in both apoptotic and non-apoptotic programmed cell death.\",\n      \"method\": \"Overexpression in 293T cells, transmission electron microscopy, flow cytometry, co-expression assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — functional epistasis by co-overexpression, single lab\",\n      \"pmids\": [\"15020679\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"siRNA knockdown of PDCD5 attenuates Bax-overexpression-induced apoptosis, inhibits caspase-3 activation, and reduces cytochrome c release from mitochondria; it also reduces Bax translocation from cytosol to mitochondria, placing PDCD5 upstream of the mitochondrial apoptosis pathway acting through Bax translocation.\",\n      \"method\": \"siRNA knockdown, Western blot, flow cytometry, cytochrome c fractionation, caspase-3 activity assay\",\n      \"journal\": \"Apoptosis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined cellular phenotype and multiple readouts, single lab\",\n      \"pmids\": [\"16374546\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Exogenous PDCD5 protein is taken up by cells via a clathrin-independent endocytic pathway involving heparan sulfate proteoglycan binding and lipid rafts; deletion mutagenesis mapped the translocation activity to residues 109–115 of PDCD5.\",\n      \"method\": \"Endocytosis assays with fluorescent PDCD5, clathrin dominant-negative mutant, lipid raft disruption drugs, sucrose density centrifugation, electron microscopy, deletion mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods (mutagenesis, dominant-negative, drug inhibition, fractionation, EM) in a single rigorous study\",\n      \"pmids\": [\"16754680\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"PDCD5 binds heparin with a binding constant of 4.17×10⁴ M⁻¹ as determined by Scatchard analysis; PDCD5-related peptides also interact with heparin, consistent with heparan sulfate proteoglycan-mediated cell entry.\",\n      \"method\": \"Capillary zone electrophoresis (CZE), Scatchard analysis\",\n      \"journal\": \"Analytical and bioanalytical chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — quantitative in vitro binding assay, single lab, single method\",\n      \"pmids\": [\"17165023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PDCD5 physically binds to Tip60 histone acetyltransferase (HAT); PDCD5 enhances Tip60 protein stability, increases Tip60 HAT activity, promotes Tip60-dependent histone acetylation, and increases Tip60-mediated K120 acetylation of p53. After UV irradiation the PDCD5–Tip60 complex increases and cooperatively accelerates DNA damage-induced apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, GST-pulldown, HAT activity assays, Western blot for p53-K120 acetylation, siRNA knockdown, UV irradiation apoptosis assay\",\n      \"journal\": \"Neoplasia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — reciprocal Co-IP, in vitro HAT assay, functional knockdown with multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"19308289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PDCD5 is phosphorylated by CK2 kinase at Ser118 both in vitro and in 293T cells; the non-phosphorylatable S118A mutant impairs PDCD5's ability to accelerate doxorubicin- or UV-induced apoptosis in U2OS cells.\",\n      \"method\": \"In vitro kinase assay with CK2α and holoenzyme, mass spectrometry identification of phospho-S118, transfection of S118A mutant, apoptosis assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro phosphorylation assay combined with site-directed mutagenesis and functional validation, single lab\",\n      \"pmids\": [\"19616514\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The yeast PDCD5 homolog Ymr074cP (N116 fragment) adopts a triple-helix bundle fold as determined by NMR; overexpression of Ymr074c promotes H₂O₂-induced apoptosis in yeast in both a metacaspase Yca1-dependent and Yca1-independent manner, and deletion of the N-terminal helix attenuates its pro-apoptotic activity.\",\n      \"method\": \"Heteronuclear NMR solution structure, spin-label experiments, yeast overexpression, Yca1 deletion epistasis\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structure with functional mutagenesis and genetic epistasis, single lab\",\n      \"pmids\": [\"19469552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PDCD5 directly binds p53 (shown by GST-pulldown, co-immunoprecipitation, and co-localization); PDCD5 enhances p53 stability by antagonizing Mdm2-induced ubiquitination, nuclear export and proteasomal degradation, displaces p53 from the p53–Mdm2 complex, and directly promotes Mdm2 degradation. PDCD5 is also required for proper G1 arrest and p53 phosphorylation (Ser9, 20, 392) and p21 expression after DNA damage.\",\n      \"method\": \"GST-pulldown, co-immunoprecipitation, co-localization, ubiquitination assay, RNAi knockdown, chromatin immunoprecipitation (ChIP), cell cycle analysis\",\n      \"journal\": \"Apoptosis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal biochemical methods (pulldown, Co-IP, ChIP, ubiquitination assay) with loss-of-function validation in single rigorous study\",\n      \"pmids\": [\"22914926\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DNAJB1 interacts with PDCD5 (identified by yeast two-hybrid, confirmed by Co-IP) via its D5 domain (Δ180-210) and induces ubiquitin-dependent proteasomal degradation of PDCD5, thereby inhibiting p53-mediated apoptosis; DNAJB1 knockdown increases etoposide-induced p53-pathway apoptosis in a PDCD5-dependent manner.\",\n      \"method\": \"Yeast two-hybrid screen, Co-IP, domain mapping, ubiquitination assay, siRNA knockdown, colony formation and apoptosis assays\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid validated by Co-IP, ubiquitination assay, and functional rescue, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"25444898\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"OTUD5 deubiquitinase binds PDCD5 in response to DNA damage (etoposide treatment) and stabilizes PDCD5 by deubiquitinating it at Lys-97/98; OTUD5-dependent PDCD5 stabilization is required for sequential p53 activation. PDCD5 mutants defective for OTUD5 interaction (E94D) or p53 interaction (E16D) fail to facilitate p53 activation.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination/deubiquitination assay, site-directed mutagenesis, knockdown and rescue experiments, apoptosis assays\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — biochemical deubiquitination assay, site-specific mutagenesis, epistasis by knockdown with rescue, multiple orthogonal methods\",\n      \"pmids\": [\"25499082\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"YAF2 (YY1-associated factor 2) binds PDCD5 (identified by yeast two-hybrid, confirmed by Co-IP) and stabilizes PDCD5 by blocking ubiquitin-dependent proteasomal degradation; YAF2 promotes p53 activation via PDCD5. PDCD5 mutants defective for YAF2 interaction (E4D) or p53 interaction (E16D) cannot rescue impaired apoptosis upon PDCD5 ablation.\",\n      \"method\": \"Yeast two-hybrid, Co-IP, ubiquitination assay, siRNA knockdown, domain mutagenesis, apoptosis assay\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid confirmed by Co-IP, mutagenesis and functional epistasis, single lab\",\n      \"pmids\": [\"25603536\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PDCD5 knockout in mice causes embryonic lethality at mid-gestation due to placental dysplasia (defective spongiotrophoblasts and trophoblast giant cells); PDCD5-knockout MEFs show increased apoptosis, G0/G1 arrest, and decreased VEGF/HGF and Pik3ca-Akt-mTOR pathway activity.\",\n      \"method\": \"Conditional knockout mouse model, histopathology, Western blot, cell cycle analysis\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — rigorous in vivo knockout with defined morphological and molecular phenotype, single lab\",\n      \"pmids\": [\"28542142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PDCD5 interacts with FOXP3 and increases FOXP3 acetylation in synergy with Tip60, enhancing the repressive function of FOXP3 in regulatory T cells; PDCD5 transgenic mice show increased Treg frequency, enhanced TGF-β-induced Treg polarization, and reduced autoimmune encephalomyelitis severity.\",\n      \"method\": \"Co-immunoprecipitation, acetylation assay, PDCD5 transgenic mice, EAE model, T cell polarization assay, flow cytometry\",\n      \"journal\": \"Journal of autoimmunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, functional acetylation assay, and in vivo transgenic model with defined immune phenotype; multiple methods\",\n      \"pmids\": [\"24012345\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Serine/threonine phosphatase PPEF-1 physically interacts with PDCD5 and dephosphorylates it at Ser-119, leading to PDCD5 destabilization; catalytically inactive PPEF-1D172N does not suppress CK2α-mediated PDCD5 stabilization or p53-mediated apoptosis, demonstrating phosphatase activity is required.\",\n      \"method\": \"Co-immunoprecipitation, in vitro phosphatase assay, site-directed mutagenesis of PPEF-1 active site, Western blot stability assays, knockdown/overexpression apoptosis assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro phosphatase assay combined with catalytic-dead mutant and functional rescue, single lab\",\n      \"pmids\": [\"28051100\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"T cell-specific PDCD5 deletion in mice abolishes the iNKT1 lineage by reducing T-bet expression in early thymic iNKT cells; PDCD5 stabilizes TOX2 (a high mobility group protein), which promotes permissive H3K4me3 modification at the Tbx21 (T-bet) promoter, linking PDCD5 to epigenetic regulation of iNKT1 fate.\",\n      \"method\": \"Conditional T cell Pdcd5 knockout mouse, flow cytometry, ChIP for H3K4me3, Co-immunoprecipitation of PDCD5-TOX2\",\n      \"journal\": \"Cellular & molecular immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo knockout with defined lineage phenotype, Co-IP, and ChIP-based epigenetic mechanism, single lab\",\n      \"pmids\": [\"29921968\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"STK31 (serine/threonine kinase 31) interacts with PDCD5 and stabilizes PDCD5 protein; STK31 overexpression activates PDCD5-mediated p53 apoptotic signaling in response to etoposide, while STK31 depletion impairs this pathway in a PDCD5-dependent manner.\",\n      \"method\": \"Co-immunoprecipitation, Western blot stability assay, overexpression and knockdown with apoptosis assays, colony formation assay\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP with functional epistasis, single lab\",\n      \"pmids\": [\"30144069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Lgr5 directly binds PDCD5 via its N-terminal extracellular domain (shown by Co-IP and GST-pulldown); Lgr5 blocks nuclear translocation of PDCD5, thereby preventing PDCD5-dependent p53 stabilization and causing p53 degradation, leading to doxorubicin resistance in hepatocellular carcinoma.\",\n      \"method\": \"Yeast two-hybrid, Co-IP, GST-pulldown, nuclear/cytoplasmic fractionation, ubiquitination assay, in vitro and in vivo chemoresistance assays\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — yeast two-hybrid confirmed by reciprocal Co-IP and GST-pulldown, nuclear fractionation, multiple orthogonal methods\",\n      \"pmids\": [\"31244936\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Cryo-electron tomography in human cells reveals that PDCD5 specifically binds to the open (but not closed) state of the TRiC/CCT chaperonin complex, at a position compatible with both substrate and prefoldin binding, suggesting PDCD5 is a state-specific cofactor of TRiC.\",\n      \"method\": \"Cryo-electron tomography (in situ), structural analysis of TRiC states in intact human cells\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in-cell cryo-ET structural study identifying state-selective binding, single study but highest-resolution in-cell approach\",\n      \"pmids\": [\"39663456\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PDCD5 is required for flagellum biogenesis in spermatids and ciliogenesis in mouse ciliated cells; structural studies show PDCD5 interacts with open-state TRiC and promotes substrate release by competing with PhLP2A for TRiC binding; PDCD5 depletion traps flagellum- and cilium-associated proteins inside TRiC. The C-terminus of PDCD5 is required for TRiC interaction and this function.\",\n      \"method\": \"Mouse PDCD5 knockout, cryo-EM structures of PDCD5-TRiC at near-atomic resolution, competitive binding assay (PDCD5 vs. PhLP2A), mass spectrometry of trapped TRiC substrates, C-terminal deletion mutagenesis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — near-atomic cryo-EM structure, in vivo knockout phenotype, competitive biochemical assay, and domain mutagenesis in single rigorous study\",\n      \"pmids\": [\"41506263\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PDCD5 interaction with PRDM9 promotes nuclear translocation and lysine methyltransferase activity of PRDM9, leading to H3K4me3 modification of effector-phenotype genes (including Tbx21) in CD8+ T cells; Pdcd5 deletion impairs CD8+ effector T cell differentiation and chromatin accessibility at Tbx21 and its target genes without affecting T cell activation, metabolic reprogramming, or memory/exhaustion.\",\n      \"method\": \"Conditional Pdcd5 knockout in T cells, Co-immunoprecipitation of PDCD5-PRDM9, ChIP for H3K4me3 and chromatin accessibility (ATAC-seq), chronic viral infection mouse model\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo knockout with defined phenotype, Co-IP, ChIP/ATAC-seq epigenetic mechanism, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"40111008\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PDCD5 contributes to airway epithelial cell damage via the mitochondrial pathway; PDCD5 silencing attenuates cigarette smoke extract (CSE)-induced mitochondrial ROS accumulation, mitochondrial membrane potential loss, intracellular ATP depletion, and mitochondrial structural damage in airway epithelial cells.\",\n      \"method\": \"siRNA knockdown, ROS measurement, JC-1 membrane potential assay, ATP measurement, transmission electron microscopy, apoptosis assay\",\n      \"journal\": \"The Kaohsiung journal of medical sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — loss-of-function with multiple mitochondrial readouts, single lab\",\n      \"pmids\": [\"41447117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"JMJD4 directly interacts with PDCD5 (identified by LC-MS, confirmed by Co-IP) and negatively regulates PDCD5 protein levels, thereby suppressing the PDCD5-TP53 apoptotic pathway and promoting cancer cell proliferation and chemo-resistance.\",\n      \"method\": \"Liquid chromatography–mass spectrometry (LC-MS) interactome, Co-immunoprecipitation, Western blot, colony-formation assay, apoptosis assay\",\n      \"journal\": \"BMB reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — LC-MS confirmed by Co-IP with functional assays, single lab\",\n      \"pmids\": [\"39567206\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"A study using conditional shRNA ablation of PDCD5 in multiple cell types found that PDCD5 was dispensable for DNA damage-induced apoptosis and cell cycle arrest; while PDCD5–p53 interaction was confirmed, PDCD5–Tip60 interaction could not be confirmed in these cell lines. This constitutes a NEGATIVE finding challenging the universality of PDCD5 as a rate-limiting factor in the DNA damage response.\",\n      \"method\": \"Conditional shRNA cell lines, apoptosis assay after genotoxic stress, Co-IP for PDCD5–p53 and PDCD5–Tip60\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — rigorous loss-of-function in multiple cell lines with negative result for apoptosis rate-limiting role and for Tip60 interaction; single lab\",\n      \"pmids\": [\"26062895\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PDCD5 is a pro-apoptotic protein that, in response to stress signals, undergoes nuclear translocation and stabilizes p53 by competing with Mdm2 and promoting Mdm2 degradation; it co-activates Tip60 HAT activity to acetylate p53-K120, is stabilized post-translationally by deubiquitination via OTUD5 (at K97/98), by YAF2 and STK31, and is destabilized by DNAJB1-mediated ubiquitination and PPEF-1-mediated dephosphorylation at Ser119 (CK2 phosphorylation at Ser118 being activating); it also promotes mitochondrial apoptosis by facilitating Bax translocation and cytochrome c release; outside apoptosis, PDCD5 binds the open state of the TRiC chaperonin complex via its C-terminus and promotes substrate release by competing with PhLP2A, a function essential for flagellum biogenesis and ciliogenesis, while in T cells it stabilizes TOX2 and PRDM9 to drive H3K4me3 epigenetic programming of T-bet (Tbx21), determining iNKT1 and CD8+ effector T cell fate.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PDCD5 is a stress-responsive regulatory protein with dual roles as a pro-apoptotic effector and a state-specific cofactor of the TRiC/CCT chaperonin [#0, #21]. In its apoptotic role, PDCD5 rapidly translocates from cytoplasm to nucleus early in apoptosis, preceding phosphatidylserine externalization and DNA fragmentation [#1], where it operates as a positive regulator of the p53 pathway: it binds p53 directly, antagonizes Mdm2-mediated ubiquitination and nuclear export, displaces p53 from the p53\\u2013Mdm2 complex, promotes Mdm2 degradation, and is required for p53 phosphorylation, p21 induction, and G1 arrest after DNA damage [#11]. PDCD5 also binds and stabilizes the Tip60 acetyltransferase, enhancing Tip60-mediated K120 acetylation of p53 and cooperatively accelerating DNA damage-induced apoptosis [#8]. In parallel it engages the mitochondrial apoptotic axis, facilitating Bax translocation, permeability transition pore opening, and cytochrome c release [#3, #5]. PDCD5 abundance is set by an extensive post-translational network: CK2 phosphorylation at Ser118 is activating [#9], whereas PPEF-1 dephosphorylation at Ser119 destabilizes it [#17]; OTUD5 deubiquitinates PDCD5 at K97/98 and YAF2 and STK31 block its proteasomal turnover to enable p53 activation [#13, #14, #19], while DNAJB1 and JMJD4 promote its degradation [#12, #25]. Lgr5 sequesters PDCD5 from the nucleus to blunt p53 stabilization and confer chemoresistance [#20]. Distinct from apoptosis, PDCD5 binds the open state of TRiC via its C-terminus and promotes folded-substrate release by competing with PhLP2A, a function essential for flagellum biogenesis and ciliogenesis [#21, #22]. In the immune system PDCD5 directs T-cell fate epigenetically by stabilizing TOX2 and activating PRDM9 to deposit permissive H3K4me3 at the Tbx21 (T-bet) locus, programming iNKT1 and CD8+ effector differentiation [#18, #23], and it cooperates with Tip60 to acetylate FOXP3 in regulatory T cells [#16]. PDCD5 is essential in development, as germline knockout causes mid-gestation embryonic lethality from placental dysplasia [#15].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established PDCD5 as a bona fide pro-apoptotic gene, defining the founding functional hypothesis for all subsequent mechanism.\",\n      \"evidence\": \"cDNA-RDA cloning from apoptotic leukemia cells and overexpression death assays in tumor cells\",\n      \"pmids\": [\"9920759\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Overexpression-only; no endogenous mechanism\", \"No molecular partner identified\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Resolved when and where PDCD5 acts by showing stimulus-independent nuclear translocation that precedes downstream apoptotic hallmarks, implying an early regulatory step.\",\n      \"evidence\": \"Immunofluorescence, subcellular fractionation and live imaging across multiple cell lines and stimuli\",\n      \"pmids\": [\"11741587\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Translocation trigger and nuclear target unknown at the time\", \"Does not establish causality versus correlation with apoptosis\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstrated endogenous PDCD5 is required, not merely sufficient, for apoptosis acceleration, and placed it functionally at the mitochondrion.\",\n      \"evidence\": \"Intracellular anti-PDCD5 antibody electroporation and in vitro isolated-mitochondria PTP/cytochrome c assays\",\n      \"pmids\": [\"12151055\", \"12019438\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of mitochondrial action undefined\", \"No direct mitochondrial protein partner identified\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined how exogenous PDCD5 enters cells, mapping a heparan-sulfate/lipid-raft uptake route and the residues 109-115 translocation determinant relevant to its candidate therapeutic delivery.\",\n      \"evidence\": \"Endocytosis assays with dominant-negatives, raft disruption, EM and deletion mutagenesis; heparin-binding quantification by capillary electrophoresis\",\n      \"pmids\": [\"16754680\", \"17165023\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological relevance of cell entry versus intracellular function unclear\", \"Receptor identity beyond HSPG not defined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Positioned PDCD5 upstream of the mitochondrial apoptotic core by showing it is required for Bax translocation, cytochrome c release and caspase-3 activation.\",\n      \"evidence\": \"siRNA knockdown with cytochrome c fractionation, caspase assays and Bax localization in Bax-overexpression apoptosis\",\n      \"pmids\": [\"16374546\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct biochemical link between PDCD5 and Bax not shown\", \"Endogenous-stimulus dependence not tested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified the first chromatin-level effector mechanism: PDCD5 stabilizes and activates Tip60 to acetylate p53-K120, coupling PDCD5 to the DNA damage response.\",\n      \"evidence\": \"Reciprocal Co-IP, GST-pulldown, in vitro HAT assays and UV-irradiation apoptosis with knockdown\",\n      \"pmids\": [\"19308289\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Tip60 binding is universal across cell types unresolved\", \"Structural basis of Tip60 stabilization unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Established phospho-regulation of PDCD5 activity, showing CK2 phosphorylation of Ser118 is required for its apoptosis-accelerating function.\",\n      \"evidence\": \"In vitro CK2 kinase assay, mass-spec phosphosite mapping and S118A mutant apoptosis assays; yeast homolog NMR triple-helix structure with pro-apoptotic mutagenesis\",\n      \"pmids\": [\"19616514\", \"19469552\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Ser118 phosphorylation alters PDCD5 behavior mechanistically not defined\", \"Human full-length structure not solved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Delineated the core p53-stabilizing mechanism: PDCD5 binds p53, antagonizes Mdm2-mediated ubiquitination/export, and drives Mdm2 degradation, explaining its DNA-damage checkpoint role.\",\n      \"evidence\": \"GST-pulldown, Co-IP, ubiquitination assays, ChIP, RNAi and cell-cycle analysis\",\n      \"pmids\": [\"22914926\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which PDCD5 promotes Mdm2 degradation not fully defined\", \"Direct versus indirect competition for p53 not structurally resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Opened the post-translational stability axis, identifying DNAJB1 as a destabilizer and OTUD5 as a DNA-damage-induced deubiquitinase that stabilizes PDCD5 at K97/98 to license sequential p53 activation.\",\n      \"evidence\": \"Yeast two-hybrid, Co-IP, ubiquitination/deubiquitination assays, site-directed mutants and rescue apoptosis assays\",\n      \"pmids\": [\"25444898\", \"25499082\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream signals controlling OTUD5/DNAJB1 engagement unclear\", \"Quantitative contribution of each regulator in vivo not established\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Expanded the stabilizer network (YAF2) and revealed essential developmental and immunoregulatory functions, including embryonic lethality from placental dysplasia and FOXP3 acetylation in Tregs.\",\n      \"evidence\": \"Yeast two-hybrid/Co-IP for YAF2, conditional knockout mouse with histopathology, and transgenic mouse EAE/Treg polarization studies\",\n      \"pmids\": [\"25603536\", \"28542142\", \"24012345\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether placental phenotype reflects p53 or apoptosis-independent roles unresolved\", \"Tissue-specific requirement versus systemic role not separated\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Provided a contrasting negative result, finding PDCD5 dispensable for DNA-damage apoptosis in several lines and failing to confirm the Tip60 interaction, qualifying the universality of the p53/Tip60 model.\",\n      \"evidence\": \"Conditional shRNA ablation across cell types with genotoxic-stress apoptosis assays and Co-IP\",\n      \"pmids\": [\"26062895\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cell-type context dependence not reconciled with positive studies\", \"Does not exclude redundancy masking a requirement\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Closed the phospho-regulatory loop by identifying PPEF-1 as the phosphatase that dephosphorylates Ser119 to destabilize PDCD5, counterbalancing CK2.\",\n      \"evidence\": \"Co-IP, in vitro phosphatase assay, catalytic-dead PPEF-1 mutant and stability/apoptosis assays\",\n      \"pmids\": [\"28051100\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship between Ser118 and Ser119 phospho-states not integrated\", \"Upstream control of PPEF-1 activity unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Revealed an epigenetic effector mechanism in immunity: PDCD5 stabilizes TOX2 to deposit H3K4me3 at the Tbx21 promoter, controlling iNKT1 lineage fate via T-bet.\",\n      \"evidence\": \"T-cell-specific Pdcd5 knockout, flow cytometry, H3K4me3 ChIP and PDCD5-TOX2 Co-IP\",\n      \"pmids\": [\"29921968\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TOX2 stabilization uses the same machinery as p53 regulation unknown\", \"Direct biochemical mechanism of histone-mark deposition not shown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Added STK31 as a stabilizing kinase-family interactor that activates PDCD5-mediated p53 apoptotic signaling.\",\n      \"evidence\": \"Co-IP, stability Western blots and PDCD5-dependent apoptosis epistasis\",\n      \"pmids\": [\"30144069\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether STK31 phosphorylates PDCD5 directly not tested\", \"Single-lab Co-IP without reciprocal validation\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified Lgr5 as a sequestering partner that blocks PDCD5 nuclear translocation to suppress p53 and confer hepatocellular carcinoma chemoresistance, linking PDCD5 regulation to drug response.\",\n      \"evidence\": \"Yeast two-hybrid, reciprocal Co-IP/GST-pulldown, fractionation and in vitro/in vivo chemoresistance assays\",\n      \"pmids\": [\"31244936\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and dynamics of Lgr5-PDCD5 sequestration not quantified\", \"Generality across tumor types untested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Reframed PDCD5 beyond apoptosis by showing it is a state-selective cofactor that binds the open TRiC/CCT chaperonin at a position overlapping substrate and prefoldin sites.\",\n      \"evidence\": \"In-cell cryo-electron tomography resolving TRiC conformational states in human cells\",\n      \"pmids\": [\"39663456\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of TRiC binding not established in this study\", \"Link between chaperonin and apoptotic roles unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined the chaperonin mechanism and its physiology: PDCD5 promotes TRiC substrate release by competing with PhLP2A via its C-terminus, a step essential for flagellum and ciliary biogenesis.\",\n      \"evidence\": \"Mouse knockout, near-atomic cryo-EM of PDCD5-TRiC, PDCD5-vs-PhLP2A competition assay, mass-spec of trapped substrates and C-terminal deletion\",\n      \"pmids\": [\"41506263\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a single protein serves both nuclear/apoptotic and chaperonin roles unresolved\", \"Substrate spectrum of PDCD5-dependent release incompletely defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended the epigenetic-programming theme to PRDM9 and CD8+ effector fate, and added new apoptotic regulators (JMJD4) and a mitochondrial role in airway injury, broadening PDCD5's functional reach.\",\n      \"evidence\": \"Conditional Pdcd5 knockout, PDCD5-PRDM9 Co-IP, ChIP/ATAC-seq; LC-MS/Co-IP for JMJD4; siRNA with mitochondrial ROS/membrane-potential readouts in airway cells\",\n      \"pmids\": [\"40111008\", \"39567206\", \"41447117\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PRDM9/TOX2 epigenetic pathways converge mechanistically unknown\", \"JMJD4 and airway findings are single-lab with limited orthogonal validation\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how PDCD5's nuclear p53/apoptotic activity, its TRiC chaperonin cofactor function, and its epigenetic T-cell programming are mechanistically and structurally partitioned within one small protein.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified structural model reconciling the distinct interaction surfaces\", \"Signals that route PDCD5 between these functions are unknown\", \"Relative physiological weighting of each role across tissues undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [11, 8, 22]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [11, 22, 18]},\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [21, 22]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [6, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 11, 20]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 5]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [3, 5, 24]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [0, 5, 11]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [21, 22]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [16, 18, 23]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [8, 18, 23]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [22]}\n    ],\n    \"complexes\": [\n      \"TRiC/CCT chaperonin (open-state cofactor)\"\n    ],\n    \"partners\": [\n      \"TP53\",\n      \"Tip60 (KAT5)\",\n      \"MDM2\",\n      \"OTUD5\",\n      \"DNAJB1\",\n      \"YAF2\",\n      \"PPEF-1\",\n      \"TOX2\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":9,"faith_total":9,"faith_pct":100.0}}