{"gene":"GADD45B","run_date":"2026-06-09T23:54:44","timeline":{"discoveries":[{"year":2001,"finding":"GADD45B is transcriptionally upregulated by NF-κB (specifically RelA/p65) and directly suppresses TNF-induced JNK cascade activation, thereby protecting cells from TNFα-induced apoptosis. This establishes GADD45B as the molecular link between NF-κB and JNK pathway antagonism.","method":"Genetic epistasis, antisense inhibition, reporter assays, and loss-of-function in cell lines","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — replicated across multiple labs, antisense knockdown with defined JNK/apoptosis readout, mechanistic pathway placement confirmed independently","pmids":["11713530"],"is_preprint":false},{"year":2002,"finding":"GADD45B (and GADD45G) specifically interact with the CDK1/CyclinB1 complex (but not other CDK/Cyclin complexes) in vitro and in vivo, inhibiting CDK1/CyclinB1 kinase activity; GADD45B inhibition involves disruption of the CDK1/CyclinB1 complex. All three GADD45 proteins cooperate in S and G2/M checkpoint activation after UV irradiation.","method":"In vitro kinase assay, co-immunoprecipitation, antisense RNA cell lines","journal":"Journal of cellular physiology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro kinase assay plus in vivo Co-IP, single lab but multiple orthogonal methods","pmids":["12124778"],"is_preprint":false},{"year":2002,"finding":"GADD45B protein binds and activates MTK1 (MEKK4), a MAPKKK upstream of the p38 MAPK cascade, and Smad-dependent GADD45B expression is responsible for the delayed (but not early) TGF-β-induced p38 activation.","method":"Overexpression, antisense inhibition, binding assays, reporter assays in cell lines","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct binding to MTK1 demonstrated, antisense knockdown with specific p38 readout, single lab with multiple orthogonal methods","pmids":["12456654"],"is_preprint":false},{"year":2002,"finding":"Three κB elements at positions -447/-438, -426/-417, and -377/-368 in the GADD45B promoter are each required for optimal transactivation; each site binds NF-κB complexes in vitro and RelA (but not Rel or p50) is sufficient to activate GADD45B expression.","method":"Promoter reporter assays, EMSA (electrophoretic mobility shift assay), transient transfection in HeLa cells","journal":"DNA and cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter dissection with EMSA and reporter assays, single lab, multiple elements confirmed","pmids":["12162804"],"is_preprint":false},{"year":2003,"finding":"GADD45B expression is induced by TGF-β as an immediate-early response gene through Smad2, Smad3, and Smad4; ectopic GADD45B expression is sufficient to activate p38 and trigger apoptosis in hepatocytes; antisense inhibition of GADD45B blocks TGF-β-dependent p38 activation and apoptosis; Gadd45b-/- mouse primary hepatocytes fail to activate p38 or undergo apoptosis in response to TGF-β.","method":"Promoter reporter assay, Smad overexpression, ectopic expression, antisense knockdown, Gadd45b-/- primary hepatocytes","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods including knockout mouse primary cells, replication of findings across cell and genetic models","pmids":["12933797"],"is_preprint":false},{"year":2003,"finding":"A novel TGF-β-responsive enhancer in the third intron of the GADD45B gene mediates TGF-β induction; SMAD3 and SMAD4 (but not SMAD2) are required for this transcriptional activation. GADD45B-deficient cells arrest in G2 following TGF-β treatment, revealing a role for GADD45B in facilitating G2 progression.","method":"Genomic sequence alignment, siRNA knockdown of individual SMADs, reconstitution in SMAD-deficient cancer cells, reporter assays, loss-of-function cell lines","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — three independent experimental lines (overexpression, siRNA, reconstitution), SMAD specificity established","pmids":["14630914"],"is_preprint":false},{"year":1996,"finding":"GADD45B (MyD118) is a nuclear protein that interacts with PCNA and p21WAF1/CIP1; it modestly stimulates DNA repair in vitro; GADD45B, GADD45A, and p21 synergize in suppressing colony formation.","method":"Nuclear localization by immunofluorescence, co-immunoprecipitation, in vitro DNA repair assay, colony suppression assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — co-immunoprecipitation and in vitro assay, single lab, multiple binding partners confirmed","pmids":["8700517"],"is_preprint":false},{"year":2000,"finding":"The C-terminal region (amino acids 114–156) of GADD45B mediates interaction with PCNA; the N-terminal (1–46) and middle (100–127) regions of PCNA harbor the GADD45B-interacting domains. Ectopic expression of GADD45B N-terminal peptides lacking the PCNA-interacting domain suppresses colony formation and induces apoptosis more efficiently than full-length GADD45B, indicating PCNA interaction impedes GADD45B-mediated negative growth control.","method":"Complementary in vivo and in vitro interaction assays, domain mapping, colony formation assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — domain-level interaction mapping with in vitro and in vivo confirmation, functional consequence of domain disruption established","pmids":["10828065"],"is_preprint":false},{"year":2007,"finding":"GADD45B is a structured protein with a predicted four-stranded β-sheet core, five α-helices, and two acidic loops. Association with MKK7 is mediated by helices α3 and α4 and loops 1 and 2; α3 primarily mediates docking to MKK7, while loop 1 and α4-loop 2 engage the ATP-binding site to cause conformational changes that impede catalytic function.","method":"Structural prediction, mutagenesis, binding and kinase activity assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — structural analysis with mutagenesis and functional validation in a single rigorous study, mechanistic detail at residue level","pmids":["17485467"],"is_preprint":false},{"year":2009,"finding":"Neuronal activity induces GADD45B expression as an immediate-early gene in mature hippocampal neurons; GADD45B is required for activity-induced DNA demethylation of specific gene promoters (including BDNF and FGF) and for the resulting adult hippocampal neurogenesis. Gadd45b deletion causes specific deficits in activity-induced neural progenitor proliferation and dendritic growth.","method":"Gadd45b knockout mice, activity-induced neurogenesis assays, bisulfite sequencing for DNA methylation at specific promoters, in vivo hippocampal assays","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout mouse with specific cellular phenotype, DNA methylation measured at defined loci, mechanistic pathway established","pmids":["19119186"],"is_preprint":false},{"year":2006,"finding":"In hematopoietic cells, GADD45B protects against UV-induced apoptosis by inhibiting the MKK4-JNK stress pathway (distinct from GADD45A, which activates a p38-NF-κB survival pathway). Gadd45b-deficient bone marrow cells show enhanced UV-induced apoptosis with increased JNK activation.","method":"Gadd45a- and Gadd45b-deficient mouse bone marrow cells, UV irradiation, JNK/p38/NF-κB signaling assays, apoptosis assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — knockout mouse cells, two distinct pathway assignments, orthogonal signaling readouts","pmids":["16636063"],"is_preprint":false},{"year":2008,"finding":"GADD45B promotes hepatocyte survival during liver regeneration by suppressing JNK activity; Gadd45b-/- mice show decreased hepatocyte proliferation, increased programmed cell death, and sustained JNK activation during liver regeneration. Imposing a Jnk2-null mutation completely rescues the regenerative defect in Gadd45b-/- mice (epistasis).","method":"Gadd45b-/- mice with partial hepatectomy model, epistasis with Jnk2-null mutation, JNK activation assays","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in vivo, double KO rescue, specific molecular phenotype","pmids":["18382767"],"is_preprint":false},{"year":2012,"finding":"The GADD45β-MEKK4 pathway directs p38 specifically to autophagosomes, resulting in autophagosome accumulation through p38-mediated inhibition of lysosome fusion. p38 phosphorylates the autophagy regulator ATG5 at threonine 75, inhibiting starvation-induced autophagy. Gadd45β-deficient cells show increased autophagic flux.","method":"Gadd45β-deficient fibroblasts, p38-deficient fibroblasts, autophagosome tracking, identification of Atg5-Thr75 as phosphorylation site, autophagic flux assays","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — specific phosphorylation site identified, loss-of-function genetic models with multiple cellular readouts, single lab","pmids":["23059785"],"is_preprint":false},{"year":2014,"finding":"GADD45β physically interacts with MKK7 to inhibit its kinase activity; disrupting the GADD45β/MKK7 complex with the D-tripeptide DTP3 kills multiple myeloma cells with cancer-cell specificity, without toxicity to normal cells. DTP3 ablates myeloma xenografts in mice.","method":"Drug-discovery strategy, disruption of GADD45β/MKK7 complex in cancer cells, in vitro and xenograft mouse models","journal":"Cancer cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct complex disruption validated functionally in vitro and in vivo, replicated across multiple myeloma cell lines and mouse xenografts","pmids":["25314077"],"is_preprint":false},{"year":2011,"finding":"GADD45β physically binds to nuclear receptor CAR (Constitutive Androstane Receptor) and functions as a direct transcriptional coactivator; GADD45β-CAR complex localizes to the CYP2B10 regulatory element upon TCPOBOP activation. Separate GADD45β domains mediate CAR binding and transcriptional activation. Gadd45b-/- mice show impaired early transcriptional stimulation of CAR target genes and growth delays after TCPOBOP.","method":"Gadd45b-/- mice, ChIP (chromatin immunoprecipitation), protein-protein interaction assays, domain mapping, transcriptional reporter assays","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — ChIP-confirmed complex at defined genomic locus, domain-level functional dissection, knockout mouse phenotype","pmids":["21965327"],"is_preprint":false},{"year":2010,"finding":"GADD45B enhances Col10a1 transcription in chondrocytes via the MTK1/MKK3/MKK6/p38 signaling axis and activates the TAD4 domain of C/EBPβ; dominant-negative p38α (but not JNK) disrupts the combined effect of GADD45β and C/EBPβ on the Col10a1 promoter. GADD45β knockdown prevents p38 phosphorylation and decreases Col10a1 mRNA.","method":"Reporter assays, dominant-negative kinase constructs, siRNA knockdown, ChIP for C/EBPβ binding, kinase pathway dissection in chondrocytes","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — specific pathway dissection with multiple orthogonal tools, dominant-negative rescue, C/EBPβ TAD4 as target domain","pmids":["20048163"],"is_preprint":false},{"year":2010,"finding":"CAR forms a protein complex with GADD45B; this complex represses MKK7-mediated phosphorylation of JNK1 and suppresses TNFα-induced cell death. The repression of JNK1 phosphorylation by TCPOBOP-activated CAR is abolished in Gadd45b-/- hepatocytes.","method":"In vitro protein-protein interaction assay, phosphorylation assay, primary hepatocytes from Car-/- and Gadd45b-/- mice, TNFα/actinomycin D cell death model","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro kinase assay, primary knockout mouse hepatocytes, multi-step pathway validated","pmids":["20404936"],"is_preprint":false},{"year":2013,"finding":"STAT3 acts as a transcriptional repressor of the GADD45B gene by binding to upstream regulatory elements; PPARα ligand (Wy-14,643) causes STAT3 ubiquitination and degradation (via ACOX1-induced H2O2/oxidative stress), relieving STAT3-mediated repression to activate GADD45B. Confirmed using liver-specific Stat3-null mice.","method":"Ppara-null and liver-specific Stat3-null mice, STAT3 ChIP, ubiquitination assay, forced ACOX1 overexpression, H2O2 treatment","journal":"Hepatology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic null models, ChIP, mechanistic pathway confirmed with multiple orthogonal approaches","pmids":["23939942"],"is_preprint":false},{"year":2013,"finding":"GADD45β promotes p53 protein degradation via the Src/PP2A/MDM2 pathway upon arsenite treatment, providing an anti-apoptotic effect independently of JNK inhibition. GADD45β-/- cells show elevated p53 upon arsenite exposure.","method":"GADD45β-/- cells, p53 protein stability assays, pathway inhibitors, epistasis experiments with JNK pathway","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockout cells with defined molecular mechanism, single lab, pathway dissection","pmids":["23681232"],"is_preprint":false},{"year":2004,"finding":"GADD45β and GADD45γ act upstream of MEKK4 to activate p38 MAPK in T cells, promoting IFNγ production. CD4 T cells from MEKK4-/- mice have reduced p38 activity; GADD45β/γ-induced IFNγ production is abolished in MEKK4-/- T cells or with p38 inhibition, establishing MEKK4 as the obligate downstream mediator.","method":"MEKK4-/- mice, T cell stimulation, p38 activity assays, cytokine production measurement, genetic epistasis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with MEKK4-null mice, multiple T cell readouts, pathway placement confirmed","pmids":["15044949"],"is_preprint":false},{"year":2010,"finding":"Pregnane X receptor (PXR) directly activates the GADD45β gene by binding to a distal direct repeat 4 (DR4) element in the GADD45β promoter; GADD45β expression then increases p38 MAPK phosphorylation, leading to morphological changes and cell migration in HepG2 cells. siRNA knockdown of GADD45β decreases PXR-induced p38 phosphorylation.","method":"Reporter assays with DR4 promoter element, siRNA knockdown, p38 phosphorylation assays, cell migration assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct PXR-promoter binding demonstrated, siRNA knockdown with specific p38/migration readout, single lab","pmids":["21127053"],"is_preprint":false},{"year":2010,"finding":"GADD45B enhances the interaction between p38 and retinoblastoma protein (Rb) during Fas-induced apoptosis in murine hepatocytes; depletion of GADD45B suppresses p38-mediated Rb phosphorylation and apoptosis without affecting p38 phosphorylation itself; ectopic GADD45B is sufficient to enhance p38-Rb interaction.","method":"siRNA knockdown, ectopic GADD45B expression, co-immunoprecipitation of p38-Rb, phospho-Rb and apoptosis assays in AML12 cells","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP showing p38-Rb interaction, loss- and gain-of-function in single lab, specific molecular readout","pmids":["20558744"],"is_preprint":false},{"year":2018,"finding":"Chemical cross-linking mass spectrometry demonstrates that the interaction between GADD45β and MKK7 kinase domain largely occurs between GADD45β loop 2 (region 103–117) and the MKK7 kinase enzymatic pocket; DTP3 disrupts this interaction by contacting MKK7 peptides 113–136 and 259–274.","method":"Enzymatic MS footprinting, diazirine-based cross-linking mass spectrometry (CX-MS), MKK7 deletion variant binding assay","journal":"International journal of biological macromolecules","confidence":"High","confidence_rationale":"Tier 1 / Moderate — CX-MS with deletion variant validation, specific interaction surfaces mapped at residue level, single lab","pmids":["29572137"],"is_preprint":false},{"year":2016,"finding":"GADD45B mediates podocyte injury through the ROS-GADD45B-p38 MAPK pathway; GADD45B inhibition of p38 is required for puromycin aminonucleoside (PAN)-induced podocyte apoptosis; ROS inhibition suppresses both GADD45B expression and subsequent p38 activation.","method":"Zebrafish podocyte-specific overexpression/morpholino knockdown, in vitro podocyte culture, GADD45B overexpression/shRNA knockdown, ROS inhibitor, p38 pathway assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo zebrafish model plus in vitro mechanistic dissection, pathway placement with inhibitor experiments","pmids":["26794661"],"is_preprint":false},{"year":2016,"finding":"Fasting-induced liver GADD45β controls fatty acid uptake through cytoplasmic retention of FABP1. Using liver/hepatocyte-specific gain- and loss-of-function strategies, GADD45β was shown to impact obesity-driven hyperglycaemia.","method":"Whole-body Gadd45b-/- mice, liver-specific overexpression and knockdown, FABP1 subcellular localization assays, metabolic measurements","journal":"EMBO molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — specific molecular mechanism (FABP1 cytoplasmic retention), genetic loss- and gain-of-function, single lab","pmids":["27137487"],"is_preprint":false},{"year":2023,"finding":"GADD45β interacts with the RNA-binding domain of G3BP1, causing conformational expansion of G3BP1 by dissolving its autoinhibitory intramolecular interaction; this promotes G3BP1-mediated stress granule (SG) assembly and SG-dependent type I interferon signaling upon RNA virus infection. Gadd45β knockout mice have severely impaired SG formation and interferon production.","method":"Gadd45β KO mice, viral infection models, co-IP of Gadd45β-G3BP1, conformational assays, SG formation assays, interferon signaling readouts","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct molecular mechanism (autoinhibitory interaction dissolution) with in vivo knockout confirmation, multiple orthogonal methods","pmids":["37917584"],"is_preprint":false},{"year":2015,"finding":"NF-κB c-Rel (but not p65/RelA) controls learning-induced GADD45β expression and associated BDNF DNA demethylation in hippocampal CA1 neurons during fear memory formation; conditional c-rel knockout and local siRNA knockdown prevent fear conditioning-induced increases in GADD45β mRNA, GADD45β binding at the BDNF gene, and BDNF DNA demethylation.","method":"c-rel KO mice, p65/RelA conditional mutants, pharmacological NF-κB inhibition, local siRNA knockdown in CA1, ChIP for GADD45β at BDNF promoter, bisulfite sequencing","journal":"Frontiers in molecular neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic knockout, siRNA knockdown, ChIP, and methylation assays in single study; mechanistic chain from c-Rel to GADD45β to BDNF demethylation","pmids":["26441517"],"is_preprint":false},{"year":2013,"finding":"GADD45β is transcriptionally induced by p53 via direct p53 binding to the GADD45β promoter during ischemia/anoxia; p38α-mediated phosphorylation of p53 at Ser15 and Ser20 is required for this induction, establishing a p38α-p53-GADD45β axis in anoxia-induced apoptosis.","method":"ChIP assay and surface plasmon resonance imaging for p53-promoter binding, p53 siRNA, p53 overexpression, p38α inhibitors, in vivo rat ischemia model","journal":"Journal of molecular medicine","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — direct p53-promoter binding confirmed by two methods (ChIP + SPR), p53 siRNA and overexpression, in vivo model, specific phosphorylation sites identified","pmids":["23948959"],"is_preprint":false},{"year":2019,"finding":"ALK5 (TGF-β receptor I) co-immunoprecipitates with GADD45B and mediates GADD45B protein levels by regulating Smad2/3 phosphorylation; ALK5 signaling promotes neural plasticity and neurological recovery after cerebral ischemia/reperfusion via GADD45B.","method":"Lentiviral knockdown/overexpression of ALK5 in vivo, co-immunoprecipitation of ALK5-GADD45B, Smad2/3 phosphorylation assays, neurological recovery measurement","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP establishes physical interaction, ALK5-Smad2/3-GADD45B pathway placed genetically, single lab","pmids":["31043581"],"is_preprint":false},{"year":2019,"finding":"Gadd45b regulates GADD45β-mediated TGF-β signaling in colon epithelium by competitively binding to the N-terminal domain of Smad7, thereby inhibiting Smurf-mediated degradation of TGF-β receptor type 1 (TβRI) and sustaining TGF-β signaling for wound healing and epithelial restitution.","method":"Gadd45b-/- mice, DSS colitis model, bone marrow transplantation, protein interaction (competitive binding with Smad7 N-terminal domain), TβRI degradation assays","journal":"Experimental & molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout, competitive binding mechanism, in vivo transplantation, single lab","pmids":["31666502"],"is_preprint":false},{"year":2024,"finding":"GADD45B facilitates airway inflammation and epithelial cell senescence in COPD via two distinct mechanisms: (1) directly mediating p38 phosphorylation for inflammatory responses, and (2) interacting with FOS to promote cellular senescence in a p38 phosphorylation-independent manner. Gadd45b deficiency in CS-exposed mice alleviated inflammation and senescence. CS-induced GADD45B overexpression is partially mediated by DNA hypomethylation of the GADD45B promoter.","method":"Gadd45b KO mice with cigarette smoke exposure, bidirectional GADD45B modulation in HBE cells, p38 phosphorylation assays, GADD45B-FOS interaction studies, bisulfite sequencing of GADD45B promoter","journal":"Journal of advanced research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mice plus in vitro mechanistic dissection, two distinct mechanisms demonstrated, single lab","pmids":["38342401"],"is_preprint":false},{"year":2021,"finding":"FTO-mediated m6A demethylation increases GADD45B mRNA stability; FTO knockdown increases GADD45B m6A modification and decreases GADD45B mRNA stability. GADD45B drives myogenic differentiation by activating the p38 MAPK pathway, and inactivation of p38 abolishes GADD45B-mediated myogenesis.","method":"m6A profiling, FTO knockdown, GADD45B gain/loss-of-function in goat myoblasts, p38 MAPK inhibitor rescue","journal":"Molecular therapy. Nucleic acids","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epitranscriptomic mechanism plus pathway placement with inhibitor rescue, single lab in goat cells (ortholog context)","pmids":["34513292"],"is_preprint":false}],"current_model":"GADD45B is a stress-sensor nuclear protein that functions as a signaling hub: it is transcriptionally induced by NF-κB (via RelA/c-Rel), p53, Smad2/3/4 (downstream of TGF-β/ALK5), and activity-dependent neuronal signals; it suppresses pro-apoptotic JNK signaling by directly binding and inactivating MKK7 (engaging its ATP-binding site to impede catalytic function), activates p38 MAPK by binding and stimulating MTK1/MEKK4, inhibits CDK1/CyclinB1 kinase by disrupting the complex to enforce G2/M checkpoints, interacts with PCNA and p21 through defined C-terminal and N-terminal domains respectively, facilitates active DNA demethylation at specific gene promoters (e.g., BDNF, FGF) to modulate neurogenesis and memory, acts as an inducible coactivator of nuclear receptor CAR by physical interaction to enhance transcription, directs p38 to autophagosomes via MEKK4 where p38 phosphorylates ATG5-Thr75 to inhibit autophagy, promotes G3BP1-mediated stress granule formation and type I interferon signaling by dissolving G3BP1's autoinhibitory interaction, and promotes p53 degradation via the Src/PP2A/MDM2 pathway."},"narrative":{"mechanistic_narrative":"GADD45B is a stress-inducible nuclear signaling adaptor that integrates transcriptional inputs from inflammatory, growth-factor, and genotoxic stress pathways to regulate MAP kinase signaling, cell survival, and cell-cycle progression [PMID:11713530, PMID:12933797]. It is transcriptionally induced as an immediate-early gene by NF-κB through RelA/p65 binding to multiple κB elements in its promoter [PMID:11713530, PMID:12162804], by TGF-β/Smad signaling through promoter and intronic enhancer elements (Smad2/3/4) [PMID:12933797, PMID:14630914], by p53 during anoxic stress via a p38α-p53 axis [PMID:23948959], and by activity-dependent neuronal signals downstream of c-Rel [PMID:26441517]; nuclear receptors (CAR, PXR) and epitranscriptomic (FTO/m6A) and epigenetic mechanisms further tune its abundance [PMID:21965327, PMID:21127053, PMID:34513292]. The protein's defining molecular activity is bidirectional MAP kinase control: it directly binds MKK7 and engages its ATP-binding site via helix α3 and loops 1–2 to impede catalysis, thereby suppressing pro-apoptotic JNK signaling and protecting cells from TNFα- and UV-induced death [PMID:11713530, PMID:17485467, PMID:16636063, PMID:29572137]. Conversely, GADD45B binds and activates the MAPKKK MTK1/MEKK4 to stimulate p38 MAPK, an axis that drives TGF-β-induced hepatocyte apoptosis, T-cell IFNγ production, and chondrocyte and myogenic differentiation [PMID:12456654, PMID:12933797, PMID:15044949, PMID:20048163]. Through MEKK4 it also directs p38 to autophagosomes, where p38 phosphorylates ATG5 at Thr75 to inhibit autophagy [PMID:23059785]. GADD45B enforces cell-cycle checkpoints by binding and disrupting the CDK1/CyclinB1 complex to inhibit its kinase activity [PMID:12124778] and interacts with PCNA via its C-terminal region and with p21 to modulate DNA repair and growth control [PMID:8700517, PMID:10828065]. In the nucleus it functions as a transcriptional coactivator of CAR at target gene regulatory elements [PMID:21965327] and mediates activity-induced DNA demethylation at the BDNF and FGF promoters to support adult hippocampal neurogenesis and memory [PMID:19119186, PMID:26441517]. Additional effector roles include promoting G3BP1-dependent stress granule assembly and type I interferon signaling by dissolving G3BP1 autoinhibition [PMID:37917584] and promoting p53 degradation via a Src/PP2A/MDM2 pathway [PMID:23681232]. The GADD45B/MKK7 interface is a validated cancer-cell-selective drug target: the peptide DTP3 disrupts this complex and kills multiple myeloma cells in vitro and in xenografts [PMID:25314077].","teleology":[{"year":1996,"claim":"Established GADD45B (MyD118) as a nuclear protein with growth-control activity by identifying its first physical partners, framing it as a participant in DNA-damage/repair and cell-growth machinery.","evidence":"Immunofluorescence, co-IP with PCNA and p21, in vitro DNA repair and colony suppression assays","pmids":["8700517"],"confidence":"Medium","gaps":["Interaction surfaces not mapped at this stage","Functional consequence of PCNA/p21 binding undefined"]},{"year":2000,"claim":"Mapped the GADD45B-PCNA interaction to defined domains and showed that PCNA binding restrains GADD45B growth suppression, revealing that partner engagement gates GADD45B function.","evidence":"Domain mapping, in vivo/in vitro interaction assays, colony formation with truncation constructs","pmids":["10828065"],"confidence":"High","gaps":["Physiological context of PCNA-mediated restraint unclear","No structural model of the interaction"]},{"year":2001,"claim":"Placed GADD45B as the molecular link between NF-κB survival signaling and JNK antagonism, answering how NF-κB suppresses TNF-induced apoptosis.","evidence":"Genetic epistasis, antisense knockdown, reporter assays in cell lines","pmids":["11713530"],"confidence":"High","gaps":["Direct JNK-pathway target not yet identified","Whether suppression is direct or via an intermediary unresolved at this point"]},{"year":2002,"claim":"Defined opposing MAP-kinase roles and a cell-cycle target: GADD45B activates p38 via MTK1/MEKK4 downstream of TGF-β, and inhibits CDK1/CyclinB1 by disrupting the complex for checkpoint control.","evidence":"Binding assays, antisense inhibition, reporter assays; in vitro kinase assay and co-IP with CDK1/CyclinB1; promoter dissection with EMSA defining κB elements","pmids":["12456654","12124778","12162804"],"confidence":"High","gaps":["How GADD45B both activates p38 and inhibits JNK in the same cell unresolved","Structural basis of CDK1/CyclinB1 disruption unknown"]},{"year":2003,"claim":"Established GADD45B as a TGF-β/Smad immediate-early target driving p38-dependent apoptosis and G2 progression, linking a specific upstream pathway to defined cellular outcomes.","evidence":"Smad overexpression, intronic enhancer mapping, siRNA of individual Smads, Gadd45b-/- primary hepatocytes, reporter assays","pmids":["12933797","14630914"],"confidence":"High","gaps":["Smad2 vs Smad3/4 requirement differs between reports","Cell-type basis for apoptotic vs proliferative outcome unclear"]},{"year":2004,"claim":"Confirmed MEKK4 as the obligate downstream mediator of GADD45B-driven p38 activation in T cells, cementing the GADD45B→MEKK4→p38 axis genetically.","evidence":"MEKK4-/- mice, T-cell stimulation, p38 activity and IFNγ readouts, genetic epistasis","pmids":["15044949"],"confidence":"High","gaps":["Structural basis of MEKK4 activation by GADD45B not defined"]},{"year":2006,"claim":"Distinguished GADD45B from GADD45A in vivo by showing GADD45B specifically blocks the MKK4-JNK stress pathway to limit UV-induced apoptosis in hematopoietic cells.","evidence":"Gadd45a-/- and Gadd45b-/- bone marrow cells, UV irradiation, JNK/p38/NF-κB and apoptosis assays","pmids":["16636063"],"confidence":"High","gaps":["Whether MKK4 inhibition is direct binding or indirect not established here"]},{"year":2007,"claim":"Provided residue-level mechanism for JNK suppression, showing GADD45B helices and loops dock MKK7 and engage its ATP-binding site to impede catalysis.","evidence":"Structural prediction, mutagenesis, binding and kinase activity assays","pmids":["17485467"],"confidence":"High","gaps":["Prediction-based fold, not an experimental structure","Dynamics of conformational inhibition not directly observed"]},{"year":2008,"claim":"Demonstrated the physiological survival role of GADD45B-mediated JNK suppression in vivo, showing it sustains hepatocyte proliferation during liver regeneration.","evidence":"Gadd45b-/- mice, partial hepatectomy, epistasis with Jnk2-null rescue","pmids":["18382767"],"confidence":"High","gaps":["Contribution of JNK1 vs JNK2 not fully dissected"]},{"year":2009,"claim":"Revealed a nuclear/epigenetic function distinct from MAPK signaling: GADD45B is required for activity-induced DNA demethylation at BDNF/FGF promoters driving adult hippocampal neurogenesis.","evidence":"Gadd45b knockout mice, bisulfite sequencing at defined loci, in vivo neurogenesis assays","pmids":["19119186"],"confidence":"High","gaps":["Enzymatic basis of demethylation by GADD45B not defined","Whether GADD45B acts directly on DNA or recruits demethylation machinery unresolved"]},{"year":2010,"claim":"Expanded the mechanistic repertoire: GADD45B serves as a CAR-recruited JNK repressor, enhances p38-Rb interaction in Fas apoptosis, is induced via PXR, and drives chondrocyte Col10a1 transcription through MTK1/p38 and C/EBPβ.","evidence":"Knockout hepatocytes, co-IP, DR4 promoter reporters, siRNA, dominant-negative kinases, ChIP","pmids":["20404936","20558744","21127053","20048163"],"confidence":"High","gaps":["How GADD45B selects between JNK-inhibitory and p38-activating outputs context-dependently unclear","Direct vs scaffold role in p38-Rb bridging not fully resolved"]},{"year":2011,"claim":"Defined GADD45B as a direct inducible transcriptional coactivator of nuclear receptor CAR at a target gene regulatory element, a nuclear function separable from its kinase modulation.","evidence":"Gadd45b-/- mice, ChIP at CYP2B10 element, interaction and domain mapping, reporter assays","pmids":["21965327"],"confidence":"High","gaps":["Coactivator mechanism (co-recruited factors) not defined","Generality across other nuclear receptors unknown"]},{"year":2012,"claim":"Identified a regulatory link from GADD45B-MEKK4-p38 to autophagy, showing p38 phosphorylates ATG5-Thr75 to inhibit autophagosome maturation.","evidence":"Gadd45β-deficient and p38-deficient fibroblasts, autophagosome tracking, ATG5-Thr75 site identification, flux assays","pmids":["23059785"],"confidence":"High","gaps":["Physiological settings where this axis dominates not mapped","How p38 is spatially targeted to autophagosomes mechanistically unclear"]},{"year":2013,"claim":"Added transcriptional regulators (p53 induction via p38α; STAT3 repression relieved by PPARα) and a JNK-independent anti-apoptotic route through p53 degradation, broadening GADD45B's stress-response circuitry.","evidence":"ChIP and SPR for p53-promoter binding; Stat3-null and Ppara-null mice, ubiquitination assays; Gadd45β-/- cells with p53 stability and pathway-inhibitor experiments","pmids":["23948959","23939942","23681232"],"confidence":"Medium","gaps":["Mechanism by which GADD45B engages the Src/PP2A/MDM2 axis not structurally defined","Reconciliation of GADD45B as both p53 target and p53 destabilizer needs context"]},{"year":2014,"claim":"Validated the GADD45B/MKK7 complex as a druggable, cancer-cell-selective target by showing the peptide DTP3 disrupts it and kills multiple myeloma cells without normal-cell toxicity.","evidence":"Complex-disruption drug strategy, multiple myeloma cell lines, xenograft mouse models","pmids":["25314077"],"confidence":"High","gaps":["Breadth of efficacy beyond multiple myeloma not established here"]},{"year":2018,"claim":"Refined the GADD45B-MKK7 interaction surface and DTP3 mechanism at residue level, mapping GADD45B loop 2 to the MKK7 enzymatic pocket.","evidence":"Enzymatic MS footprinting, diazirine cross-linking MS, MKK7 deletion-variant binding","pmids":["29572137"],"confidence":"High","gaps":["No high-resolution co-crystal structure of the complex"]},{"year":2023,"claim":"Uncovered a non-kinase nuclear/cytoplasmic function: GADD45B dissolves G3BP1 autoinhibition to promote stress granule assembly and type I interferon signaling during RNA virus infection.","evidence":"Gadd45β KO mice, viral infection, co-IP with G3BP1, conformational and SG assembly assays, IFN readouts","pmids":["37917584"],"confidence":"High","gaps":["Structural basis of G3BP1 conformational expansion not resolved","Relationship to GADD45B's MAPK roles in antiviral defense unclear"]},{"year":2024,"claim":"Extended GADD45B to disease tissue by showing dual p38-dependent and p38-independent (FOS-interacting) mechanisms driving airway inflammation and epithelial senescence in COPD.","evidence":"Gadd45b KO mice with cigarette-smoke exposure, bidirectional modulation in HBE cells, GADD45B-FOS interaction, promoter bisulfite sequencing","pmids":["38342401"],"confidence":"Medium","gaps":["GADD45B-FOS interaction mechanism not structurally defined","Single-lab disease model"]},{"year":null,"claim":"How GADD45B selects among its many mutually opposing outputs (JNK inhibition vs p38 activation, apoptosis vs survival, autophagy inhibition, demethylation, stress-granule assembly) in a given cellular context remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model for context-dependent partner selection","No experimental high-resolution structure of GADD45B in complex with any partner","Enzymatic basis of GADD45B-facilitated DNA demethylation undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,2,8,13]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,2,8,13,25]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[14]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[2,19,21,25]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[6]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[24,25]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,2,8,19]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[1,5]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[19,25]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[0,4,10,18]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[12]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[9,26]}],"complexes":[],"partners":["MKK7","MEKK4","CDK1","CCNB1","PCNA","CDKN1A","G3BP1","NR1I3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O75293","full_name":"Growth arrest and DNA damage-inducible protein GADD45 beta","aliases":["Myeloid differentiation primary response protein MyD118","Negative growth regulatory protein MyD118"],"length_aa":160,"mass_kda":17.8,"function":"Involved in the regulation of growth and apoptosis. 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This establishes GADD45B as the molecular link between NF-κB and JNK pathway antagonism.\",\n      \"method\": \"Genetic epistasis, antisense inhibition, reporter assays, and loss-of-function in cell lines\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — replicated across multiple labs, antisense knockdown with defined JNK/apoptosis readout, mechanistic pathway placement confirmed independently\",\n      \"pmids\": [\"11713530\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"GADD45B (and GADD45G) specifically interact with the CDK1/CyclinB1 complex (but not other CDK/Cyclin complexes) in vitro and in vivo, inhibiting CDK1/CyclinB1 kinase activity; GADD45B inhibition involves disruption of the CDK1/CyclinB1 complex. All three GADD45 proteins cooperate in S and G2/M checkpoint activation after UV irradiation.\",\n      \"method\": \"In vitro kinase assay, co-immunoprecipitation, antisense RNA cell lines\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro kinase assay plus in vivo Co-IP, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"12124778\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"GADD45B protein binds and activates MTK1 (MEKK4), a MAPKKK upstream of the p38 MAPK cascade, and Smad-dependent GADD45B expression is responsible for the delayed (but not early) TGF-β-induced p38 activation.\",\n      \"method\": \"Overexpression, antisense inhibition, binding assays, reporter assays in cell lines\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding to MTK1 demonstrated, antisense knockdown with specific p38 readout, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"12456654\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Three κB elements at positions -447/-438, -426/-417, and -377/-368 in the GADD45B promoter are each required for optimal transactivation; each site binds NF-κB complexes in vitro and RelA (but not Rel or p50) is sufficient to activate GADD45B expression.\",\n      \"method\": \"Promoter reporter assays, EMSA (electrophoretic mobility shift assay), transient transfection in HeLa cells\",\n      \"journal\": \"DNA and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter dissection with EMSA and reporter assays, single lab, multiple elements confirmed\",\n      \"pmids\": [\"12162804\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"GADD45B expression is induced by TGF-β as an immediate-early response gene through Smad2, Smad3, and Smad4; ectopic GADD45B expression is sufficient to activate p38 and trigger apoptosis in hepatocytes; antisense inhibition of GADD45B blocks TGF-β-dependent p38 activation and apoptosis; Gadd45b-/- mouse primary hepatocytes fail to activate p38 or undergo apoptosis in response to TGF-β.\",\n      \"method\": \"Promoter reporter assay, Smad overexpression, ectopic expression, antisense knockdown, Gadd45b-/- primary hepatocytes\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods including knockout mouse primary cells, replication of findings across cell and genetic models\",\n      \"pmids\": [\"12933797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"A novel TGF-β-responsive enhancer in the third intron of the GADD45B gene mediates TGF-β induction; SMAD3 and SMAD4 (but not SMAD2) are required for this transcriptional activation. GADD45B-deficient cells arrest in G2 following TGF-β treatment, revealing a role for GADD45B in facilitating G2 progression.\",\n      \"method\": \"Genomic sequence alignment, siRNA knockdown of individual SMADs, reconstitution in SMAD-deficient cancer cells, reporter assays, loss-of-function cell lines\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — three independent experimental lines (overexpression, siRNA, reconstitution), SMAD specificity established\",\n      \"pmids\": [\"14630914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"GADD45B (MyD118) is a nuclear protein that interacts with PCNA and p21WAF1/CIP1; it modestly stimulates DNA repair in vitro; GADD45B, GADD45A, and p21 synergize in suppressing colony formation.\",\n      \"method\": \"Nuclear localization by immunofluorescence, co-immunoprecipitation, in vitro DNA repair assay, colony suppression assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — co-immunoprecipitation and in vitro assay, single lab, multiple binding partners confirmed\",\n      \"pmids\": [\"8700517\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The C-terminal region (amino acids 114–156) of GADD45B mediates interaction with PCNA; the N-terminal (1–46) and middle (100–127) regions of PCNA harbor the GADD45B-interacting domains. Ectopic expression of GADD45B N-terminal peptides lacking the PCNA-interacting domain suppresses colony formation and induces apoptosis more efficiently than full-length GADD45B, indicating PCNA interaction impedes GADD45B-mediated negative growth control.\",\n      \"method\": \"Complementary in vivo and in vitro interaction assays, domain mapping, colony formation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — domain-level interaction mapping with in vitro and in vivo confirmation, functional consequence of domain disruption established\",\n      \"pmids\": [\"10828065\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"GADD45B is a structured protein with a predicted four-stranded β-sheet core, five α-helices, and two acidic loops. Association with MKK7 is mediated by helices α3 and α4 and loops 1 and 2; α3 primarily mediates docking to MKK7, while loop 1 and α4-loop 2 engage the ATP-binding site to cause conformational changes that impede catalytic function.\",\n      \"method\": \"Structural prediction, mutagenesis, binding and kinase activity assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — structural analysis with mutagenesis and functional validation in a single rigorous study, mechanistic detail at residue level\",\n      \"pmids\": [\"17485467\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Neuronal activity induces GADD45B expression as an immediate-early gene in mature hippocampal neurons; GADD45B is required for activity-induced DNA demethylation of specific gene promoters (including BDNF and FGF) and for the resulting adult hippocampal neurogenesis. Gadd45b deletion causes specific deficits in activity-induced neural progenitor proliferation and dendritic growth.\",\n      \"method\": \"Gadd45b knockout mice, activity-induced neurogenesis assays, bisulfite sequencing for DNA methylation at specific promoters, in vivo hippocampal assays\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout mouse with specific cellular phenotype, DNA methylation measured at defined loci, mechanistic pathway established\",\n      \"pmids\": [\"19119186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"In hematopoietic cells, GADD45B protects against UV-induced apoptosis by inhibiting the MKK4-JNK stress pathway (distinct from GADD45A, which activates a p38-NF-κB survival pathway). Gadd45b-deficient bone marrow cells show enhanced UV-induced apoptosis with increased JNK activation.\",\n      \"method\": \"Gadd45a- and Gadd45b-deficient mouse bone marrow cells, UV irradiation, JNK/p38/NF-κB signaling assays, apoptosis assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockout mouse cells, two distinct pathway assignments, orthogonal signaling readouts\",\n      \"pmids\": [\"16636063\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"GADD45B promotes hepatocyte survival during liver regeneration by suppressing JNK activity; Gadd45b-/- mice show decreased hepatocyte proliferation, increased programmed cell death, and sustained JNK activation during liver regeneration. Imposing a Jnk2-null mutation completely rescues the regenerative defect in Gadd45b-/- mice (epistasis).\",\n      \"method\": \"Gadd45b-/- mice with partial hepatectomy model, epistasis with Jnk2-null mutation, JNK activation assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in vivo, double KO rescue, specific molecular phenotype\",\n      \"pmids\": [\"18382767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The GADD45β-MEKK4 pathway directs p38 specifically to autophagosomes, resulting in autophagosome accumulation through p38-mediated inhibition of lysosome fusion. p38 phosphorylates the autophagy regulator ATG5 at threonine 75, inhibiting starvation-induced autophagy. Gadd45β-deficient cells show increased autophagic flux.\",\n      \"method\": \"Gadd45β-deficient fibroblasts, p38-deficient fibroblasts, autophagosome tracking, identification of Atg5-Thr75 as phosphorylation site, autophagic flux assays\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — specific phosphorylation site identified, loss-of-function genetic models with multiple cellular readouts, single lab\",\n      \"pmids\": [\"23059785\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"GADD45β physically interacts with MKK7 to inhibit its kinase activity; disrupting the GADD45β/MKK7 complex with the D-tripeptide DTP3 kills multiple myeloma cells with cancer-cell specificity, without toxicity to normal cells. DTP3 ablates myeloma xenografts in mice.\",\n      \"method\": \"Drug-discovery strategy, disruption of GADD45β/MKK7 complex in cancer cells, in vitro and xenograft mouse models\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct complex disruption validated functionally in vitro and in vivo, replicated across multiple myeloma cell lines and mouse xenografts\",\n      \"pmids\": [\"25314077\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"GADD45β physically binds to nuclear receptor CAR (Constitutive Androstane Receptor) and functions as a direct transcriptional coactivator; GADD45β-CAR complex localizes to the CYP2B10 regulatory element upon TCPOBOP activation. Separate GADD45β domains mediate CAR binding and transcriptional activation. Gadd45b-/- mice show impaired early transcriptional stimulation of CAR target genes and growth delays after TCPOBOP.\",\n      \"method\": \"Gadd45b-/- mice, ChIP (chromatin immunoprecipitation), protein-protein interaction assays, domain mapping, transcriptional reporter assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP-confirmed complex at defined genomic locus, domain-level functional dissection, knockout mouse phenotype\",\n      \"pmids\": [\"21965327\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"GADD45B enhances Col10a1 transcription in chondrocytes via the MTK1/MKK3/MKK6/p38 signaling axis and activates the TAD4 domain of C/EBPβ; dominant-negative p38α (but not JNK) disrupts the combined effect of GADD45β and C/EBPβ on the Col10a1 promoter. GADD45β knockdown prevents p38 phosphorylation and decreases Col10a1 mRNA.\",\n      \"method\": \"Reporter assays, dominant-negative kinase constructs, siRNA knockdown, ChIP for C/EBPβ binding, kinase pathway dissection in chondrocytes\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific pathway dissection with multiple orthogonal tools, dominant-negative rescue, C/EBPβ TAD4 as target domain\",\n      \"pmids\": [\"20048163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CAR forms a protein complex with GADD45B; this complex represses MKK7-mediated phosphorylation of JNK1 and suppresses TNFα-induced cell death. The repression of JNK1 phosphorylation by TCPOBOP-activated CAR is abolished in Gadd45b-/- hepatocytes.\",\n      \"method\": \"In vitro protein-protein interaction assay, phosphorylation assay, primary hepatocytes from Car-/- and Gadd45b-/- mice, TNFα/actinomycin D cell death model\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro kinase assay, primary knockout mouse hepatocytes, multi-step pathway validated\",\n      \"pmids\": [\"20404936\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"STAT3 acts as a transcriptional repressor of the GADD45B gene by binding to upstream regulatory elements; PPARα ligand (Wy-14,643) causes STAT3 ubiquitination and degradation (via ACOX1-induced H2O2/oxidative stress), relieving STAT3-mediated repression to activate GADD45B. Confirmed using liver-specific Stat3-null mice.\",\n      \"method\": \"Ppara-null and liver-specific Stat3-null mice, STAT3 ChIP, ubiquitination assay, forced ACOX1 overexpression, H2O2 treatment\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic null models, ChIP, mechanistic pathway confirmed with multiple orthogonal approaches\",\n      \"pmids\": [\"23939942\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"GADD45β promotes p53 protein degradation via the Src/PP2A/MDM2 pathway upon arsenite treatment, providing an anti-apoptotic effect independently of JNK inhibition. GADD45β-/- cells show elevated p53 upon arsenite exposure.\",\n      \"method\": \"GADD45β-/- cells, p53 protein stability assays, pathway inhibitors, epistasis experiments with JNK pathway\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockout cells with defined molecular mechanism, single lab, pathway dissection\",\n      \"pmids\": [\"23681232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"GADD45β and GADD45γ act upstream of MEKK4 to activate p38 MAPK in T cells, promoting IFNγ production. CD4 T cells from MEKK4-/- mice have reduced p38 activity; GADD45β/γ-induced IFNγ production is abolished in MEKK4-/- T cells or with p38 inhibition, establishing MEKK4 as the obligate downstream mediator.\",\n      \"method\": \"MEKK4-/- mice, T cell stimulation, p38 activity assays, cytokine production measurement, genetic epistasis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with MEKK4-null mice, multiple T cell readouts, pathway placement confirmed\",\n      \"pmids\": [\"15044949\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Pregnane X receptor (PXR) directly activates the GADD45β gene by binding to a distal direct repeat 4 (DR4) element in the GADD45β promoter; GADD45β expression then increases p38 MAPK phosphorylation, leading to morphological changes and cell migration in HepG2 cells. siRNA knockdown of GADD45β decreases PXR-induced p38 phosphorylation.\",\n      \"method\": \"Reporter assays with DR4 promoter element, siRNA knockdown, p38 phosphorylation assays, cell migration assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct PXR-promoter binding demonstrated, siRNA knockdown with specific p38/migration readout, single lab\",\n      \"pmids\": [\"21127053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"GADD45B enhances the interaction between p38 and retinoblastoma protein (Rb) during Fas-induced apoptosis in murine hepatocytes; depletion of GADD45B suppresses p38-mediated Rb phosphorylation and apoptosis without affecting p38 phosphorylation itself; ectopic GADD45B is sufficient to enhance p38-Rb interaction.\",\n      \"method\": \"siRNA knockdown, ectopic GADD45B expression, co-immunoprecipitation of p38-Rb, phospho-Rb and apoptosis assays in AML12 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP showing p38-Rb interaction, loss- and gain-of-function in single lab, specific molecular readout\",\n      \"pmids\": [\"20558744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Chemical cross-linking mass spectrometry demonstrates that the interaction between GADD45β and MKK7 kinase domain largely occurs between GADD45β loop 2 (region 103–117) and the MKK7 kinase enzymatic pocket; DTP3 disrupts this interaction by contacting MKK7 peptides 113–136 and 259–274.\",\n      \"method\": \"Enzymatic MS footprinting, diazirine-based cross-linking mass spectrometry (CX-MS), MKK7 deletion variant binding assay\",\n      \"journal\": \"International journal of biological macromolecules\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — CX-MS with deletion variant validation, specific interaction surfaces mapped at residue level, single lab\",\n      \"pmids\": [\"29572137\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"GADD45B mediates podocyte injury through the ROS-GADD45B-p38 MAPK pathway; GADD45B inhibition of p38 is required for puromycin aminonucleoside (PAN)-induced podocyte apoptosis; ROS inhibition suppresses both GADD45B expression and subsequent p38 activation.\",\n      \"method\": \"Zebrafish podocyte-specific overexpression/morpholino knockdown, in vitro podocyte culture, GADD45B overexpression/shRNA knockdown, ROS inhibitor, p38 pathway assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo zebrafish model plus in vitro mechanistic dissection, pathway placement with inhibitor experiments\",\n      \"pmids\": [\"26794661\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Fasting-induced liver GADD45β controls fatty acid uptake through cytoplasmic retention of FABP1. Using liver/hepatocyte-specific gain- and loss-of-function strategies, GADD45β was shown to impact obesity-driven hyperglycaemia.\",\n      \"method\": \"Whole-body Gadd45b-/- mice, liver-specific overexpression and knockdown, FABP1 subcellular localization assays, metabolic measurements\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific molecular mechanism (FABP1 cytoplasmic retention), genetic loss- and gain-of-function, single lab\",\n      \"pmids\": [\"27137487\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"GADD45β interacts with the RNA-binding domain of G3BP1, causing conformational expansion of G3BP1 by dissolving its autoinhibitory intramolecular interaction; this promotes G3BP1-mediated stress granule (SG) assembly and SG-dependent type I interferon signaling upon RNA virus infection. Gadd45β knockout mice have severely impaired SG formation and interferon production.\",\n      \"method\": \"Gadd45β KO mice, viral infection models, co-IP of Gadd45β-G3BP1, conformational assays, SG formation assays, interferon signaling readouts\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct molecular mechanism (autoinhibitory interaction dissolution) with in vivo knockout confirmation, multiple orthogonal methods\",\n      \"pmids\": [\"37917584\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NF-κB c-Rel (but not p65/RelA) controls learning-induced GADD45β expression and associated BDNF DNA demethylation in hippocampal CA1 neurons during fear memory formation; conditional c-rel knockout and local siRNA knockdown prevent fear conditioning-induced increases in GADD45β mRNA, GADD45β binding at the BDNF gene, and BDNF DNA demethylation.\",\n      \"method\": \"c-rel KO mice, p65/RelA conditional mutants, pharmacological NF-κB inhibition, local siRNA knockdown in CA1, ChIP for GADD45β at BDNF promoter, bisulfite sequencing\",\n      \"journal\": \"Frontiers in molecular neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout, siRNA knockdown, ChIP, and methylation assays in single study; mechanistic chain from c-Rel to GADD45β to BDNF demethylation\",\n      \"pmids\": [\"26441517\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"GADD45β is transcriptionally induced by p53 via direct p53 binding to the GADD45β promoter during ischemia/anoxia; p38α-mediated phosphorylation of p53 at Ser15 and Ser20 is required for this induction, establishing a p38α-p53-GADD45β axis in anoxia-induced apoptosis.\",\n      \"method\": \"ChIP assay and surface plasmon resonance imaging for p53-promoter binding, p53 siRNA, p53 overexpression, p38α inhibitors, in vivo rat ischemia model\",\n      \"journal\": \"Journal of molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — direct p53-promoter binding confirmed by two methods (ChIP + SPR), p53 siRNA and overexpression, in vivo model, specific phosphorylation sites identified\",\n      \"pmids\": [\"23948959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ALK5 (TGF-β receptor I) co-immunoprecipitates with GADD45B and mediates GADD45B protein levels by regulating Smad2/3 phosphorylation; ALK5 signaling promotes neural plasticity and neurological recovery after cerebral ischemia/reperfusion via GADD45B.\",\n      \"method\": \"Lentiviral knockdown/overexpression of ALK5 in vivo, co-immunoprecipitation of ALK5-GADD45B, Smad2/3 phosphorylation assays, neurological recovery measurement\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP establishes physical interaction, ALK5-Smad2/3-GADD45B pathway placed genetically, single lab\",\n      \"pmids\": [\"31043581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Gadd45b regulates GADD45β-mediated TGF-β signaling in colon epithelium by competitively binding to the N-terminal domain of Smad7, thereby inhibiting Smurf-mediated degradation of TGF-β receptor type 1 (TβRI) and sustaining TGF-β signaling for wound healing and epithelial restitution.\",\n      \"method\": \"Gadd45b-/- mice, DSS colitis model, bone marrow transplantation, protein interaction (competitive binding with Smad7 N-terminal domain), TβRI degradation assays\",\n      \"journal\": \"Experimental & molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout, competitive binding mechanism, in vivo transplantation, single lab\",\n      \"pmids\": [\"31666502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"GADD45B facilitates airway inflammation and epithelial cell senescence in COPD via two distinct mechanisms: (1) directly mediating p38 phosphorylation for inflammatory responses, and (2) interacting with FOS to promote cellular senescence in a p38 phosphorylation-independent manner. Gadd45b deficiency in CS-exposed mice alleviated inflammation and senescence. CS-induced GADD45B overexpression is partially mediated by DNA hypomethylation of the GADD45B promoter.\",\n      \"method\": \"Gadd45b KO mice with cigarette smoke exposure, bidirectional GADD45B modulation in HBE cells, p38 phosphorylation assays, GADD45B-FOS interaction studies, bisulfite sequencing of GADD45B promoter\",\n      \"journal\": \"Journal of advanced research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mice plus in vitro mechanistic dissection, two distinct mechanisms demonstrated, single lab\",\n      \"pmids\": [\"38342401\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"FTO-mediated m6A demethylation increases GADD45B mRNA stability; FTO knockdown increases GADD45B m6A modification and decreases GADD45B mRNA stability. GADD45B drives myogenic differentiation by activating the p38 MAPK pathway, and inactivation of p38 abolishes GADD45B-mediated myogenesis.\",\n      \"method\": \"m6A profiling, FTO knockdown, GADD45B gain/loss-of-function in goat myoblasts, p38 MAPK inhibitor rescue\",\n      \"journal\": \"Molecular therapy. Nucleic acids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epitranscriptomic mechanism plus pathway placement with inhibitor rescue, single lab in goat cells (ortholog context)\",\n      \"pmids\": [\"34513292\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GADD45B is a stress-sensor nuclear protein that functions as a signaling hub: it is transcriptionally induced by NF-κB (via RelA/c-Rel), p53, Smad2/3/4 (downstream of TGF-β/ALK5), and activity-dependent neuronal signals; it suppresses pro-apoptotic JNK signaling by directly binding and inactivating MKK7 (engaging its ATP-binding site to impede catalytic function), activates p38 MAPK by binding and stimulating MTK1/MEKK4, inhibits CDK1/CyclinB1 kinase by disrupting the complex to enforce G2/M checkpoints, interacts with PCNA and p21 through defined C-terminal and N-terminal domains respectively, facilitates active DNA demethylation at specific gene promoters (e.g., BDNF, FGF) to modulate neurogenesis and memory, acts as an inducible coactivator of nuclear receptor CAR by physical interaction to enhance transcription, directs p38 to autophagosomes via MEKK4 where p38 phosphorylates ATG5-Thr75 to inhibit autophagy, promotes G3BP1-mediated stress granule formation and type I interferon signaling by dissolving G3BP1's autoinhibitory interaction, and promotes p53 degradation via the Src/PP2A/MDM2 pathway.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"GADD45B is a stress-inducible nuclear signaling adaptor that integrates transcriptional inputs from inflammatory, growth-factor, and genotoxic stress pathways to regulate MAP kinase signaling, cell survival, and cell-cycle progression [#0, #4]. It is transcriptionally induced as an immediate-early gene by NF-\\u03baB through RelA/p65 binding to multiple \\u03baB elements in its promoter [#0, #3], by TGF-\\u03b2/Smad signaling through promoter and intronic enhancer elements (Smad2/3/4) [#4, #5], by p53 during anoxic stress via a p38\\u03b1-p53 axis [#27], and by activity-dependent neuronal signals downstream of c-Rel [#26]; nuclear receptors (CAR, PXR) and epitranscriptomic (FTO/m6A) and epigenetic mechanisms further tune its abundance [#14, #20, #31]. The protein's defining molecular activity is bidirectional MAP kinase control: it directly binds MKK7 and engages its ATP-binding site via helix \\u03b13 and loops 1\\u20132 to impede catalysis, thereby suppressing pro-apoptotic JNK signaling and protecting cells from TNF\\u03b1- and UV-induced death [#0, #8, #10, #22]. Conversely, GADD45B binds and activates the MAPKKK MTK1/MEKK4 to stimulate p38 MAPK, an axis that drives TGF-\\u03b2-induced hepatocyte apoptosis, T-cell IFN\\u03b3 production, and chondrocyte and myogenic differentiation [#2, #4, #19, #15]. Through MEKK4 it also directs p38 to autophagosomes, where p38 phosphorylates ATG5 at Thr75 to inhibit autophagy [#12]. GADD45B enforces cell-cycle checkpoints by binding and disrupting the CDK1/CyclinB1 complex to inhibit its kinase activity [#1] and interacts with PCNA via its C-terminal region and with p21 to modulate DNA repair and growth control [#6, #7]. In the nucleus it functions as a transcriptional coactivator of CAR at target gene regulatory elements [#14] and mediates activity-induced DNA demethylation at the BDNF and FGF promoters to support adult hippocampal neurogenesis and memory [#9, #26]. Additional effector roles include promoting G3BP1-dependent stress granule assembly and type I interferon signaling by dissolving G3BP1 autoinhibition [#25] and promoting p53 degradation via a Src/PP2A/MDM2 pathway [#18]. The GADD45B/MKK7 interface is a validated cancer-cell-selective drug target: the peptide DTP3 disrupts this complex and kills multiple myeloma cells in vitro and in xenografts [#13].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Established GADD45B (MyD118) as a nuclear protein with growth-control activity by identifying its first physical partners, framing it as a participant in DNA-damage/repair and cell-growth machinery.\",\n      \"evidence\": \"Immunofluorescence, co-IP with PCNA and p21, in vitro DNA repair and colony suppression assays\",\n      \"pmids\": [\"8700517\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Interaction surfaces not mapped at this stage\", \"Functional consequence of PCNA/p21 binding undefined\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Mapped the GADD45B-PCNA interaction to defined domains and showed that PCNA binding restrains GADD45B growth suppression, revealing that partner engagement gates GADD45B function.\",\n      \"evidence\": \"Domain mapping, in vivo/in vitro interaction assays, colony formation with truncation constructs\",\n      \"pmids\": [\"10828065\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological context of PCNA-mediated restraint unclear\", \"No structural model of the interaction\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Placed GADD45B as the molecular link between NF-\\u03baB survival signaling and JNK antagonism, answering how NF-\\u03baB suppresses TNF-induced apoptosis.\",\n      \"evidence\": \"Genetic epistasis, antisense knockdown, reporter assays in cell lines\",\n      \"pmids\": [\"11713530\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct JNK-pathway target not yet identified\", \"Whether suppression is direct or via an intermediary unresolved at this point\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Defined opposing MAP-kinase roles and a cell-cycle target: GADD45B activates p38 via MTK1/MEKK4 downstream of TGF-\\u03b2, and inhibits CDK1/CyclinB1 by disrupting the complex for checkpoint control.\",\n      \"evidence\": \"Binding assays, antisense inhibition, reporter assays; in vitro kinase assay and co-IP with CDK1/CyclinB1; promoter dissection with EMSA defining \\u03baB elements\",\n      \"pmids\": [\"12456654\", \"12124778\", \"12162804\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How GADD45B both activates p38 and inhibits JNK in the same cell unresolved\", \"Structural basis of CDK1/CyclinB1 disruption unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Established GADD45B as a TGF-\\u03b2/Smad immediate-early target driving p38-dependent apoptosis and G2 progression, linking a specific upstream pathway to defined cellular outcomes.\",\n      \"evidence\": \"Smad overexpression, intronic enhancer mapping, siRNA of individual Smads, Gadd45b-/- primary hepatocytes, reporter assays\",\n      \"pmids\": [\"12933797\", \"14630914\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Smad2 vs Smad3/4 requirement differs between reports\", \"Cell-type basis for apoptotic vs proliferative outcome unclear\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Confirmed MEKK4 as the obligate downstream mediator of GADD45B-driven p38 activation in T cells, cementing the GADD45B\\u2192MEKK4\\u2192p38 axis genetically.\",\n      \"evidence\": \"MEKK4-/- mice, T-cell stimulation, p38 activity and IFN\\u03b3 readouts, genetic epistasis\",\n      \"pmids\": [\"15044949\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of MEKK4 activation by GADD45B not defined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Distinguished GADD45B from GADD45A in vivo by showing GADD45B specifically blocks the MKK4-JNK stress pathway to limit UV-induced apoptosis in hematopoietic cells.\",\n      \"evidence\": \"Gadd45a-/- and Gadd45b-/- bone marrow cells, UV irradiation, JNK/p38/NF-\\u03baB and apoptosis assays\",\n      \"pmids\": [\"16636063\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether MKK4 inhibition is direct binding or indirect not established here\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Provided residue-level mechanism for JNK suppression, showing GADD45B helices and loops dock MKK7 and engage its ATP-binding site to impede catalysis.\",\n      \"evidence\": \"Structural prediction, mutagenesis, binding and kinase activity assays\",\n      \"pmids\": [\"17485467\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Prediction-based fold, not an experimental structure\", \"Dynamics of conformational inhibition not directly observed\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrated the physiological survival role of GADD45B-mediated JNK suppression in vivo, showing it sustains hepatocyte proliferation during liver regeneration.\",\n      \"evidence\": \"Gadd45b-/- mice, partial hepatectomy, epistasis with Jnk2-null rescue\",\n      \"pmids\": [\"18382767\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Contribution of JNK1 vs JNK2 not fully dissected\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Revealed a nuclear/epigenetic function distinct from MAPK signaling: GADD45B is required for activity-induced DNA demethylation at BDNF/FGF promoters driving adult hippocampal neurogenesis.\",\n      \"evidence\": \"Gadd45b knockout mice, bisulfite sequencing at defined loci, in vivo neurogenesis assays\",\n      \"pmids\": [\"19119186\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Enzymatic basis of demethylation by GADD45B not defined\", \"Whether GADD45B acts directly on DNA or recruits demethylation machinery unresolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Expanded the mechanistic repertoire: GADD45B serves as a CAR-recruited JNK repressor, enhances p38-Rb interaction in Fas apoptosis, is induced via PXR, and drives chondrocyte Col10a1 transcription through MTK1/p38 and C/EBP\\u03b2.\",\n      \"evidence\": \"Knockout hepatocytes, co-IP, DR4 promoter reporters, siRNA, dominant-negative kinases, ChIP\",\n      \"pmids\": [\"20404936\", \"20558744\", \"21127053\", \"20048163\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How GADD45B selects between JNK-inhibitory and p38-activating outputs context-dependently unclear\", \"Direct vs scaffold role in p38-Rb bridging not fully resolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined GADD45B as a direct inducible transcriptional coactivator of nuclear receptor CAR at a target gene regulatory element, a nuclear function separable from its kinase modulation.\",\n      \"evidence\": \"Gadd45b-/- mice, ChIP at CYP2B10 element, interaction and domain mapping, reporter assays\",\n      \"pmids\": [\"21965327\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Coactivator mechanism (co-recruited factors) not defined\", \"Generality across other nuclear receptors unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified a regulatory link from GADD45B-MEKK4-p38 to autophagy, showing p38 phosphorylates ATG5-Thr75 to inhibit autophagosome maturation.\",\n      \"evidence\": \"Gadd45\\u03b2-deficient and p38-deficient fibroblasts, autophagosome tracking, ATG5-Thr75 site identification, flux assays\",\n      \"pmids\": [\"23059785\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological settings where this axis dominates not mapped\", \"How p38 is spatially targeted to autophagosomes mechanistically unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Added transcriptional regulators (p53 induction via p38\\u03b1; STAT3 repression relieved by PPAR\\u03b1) and a JNK-independent anti-apoptotic route through p53 degradation, broadening GADD45B's stress-response circuitry.\",\n      \"evidence\": \"ChIP and SPR for p53-promoter binding; Stat3-null and Ppara-null mice, ubiquitination assays; Gadd45\\u03b2-/- cells with p53 stability and pathway-inhibitor experiments\",\n      \"pmids\": [\"23948959\", \"23939942\", \"23681232\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which GADD45B engages the Src/PP2A/MDM2 axis not structurally defined\", \"Reconciliation of GADD45B as both p53 target and p53 destabilizer needs context\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Validated the GADD45B/MKK7 complex as a druggable, cancer-cell-selective target by showing the peptide DTP3 disrupts it and kills multiple myeloma cells without normal-cell toxicity.\",\n      \"evidence\": \"Complex-disruption drug strategy, multiple myeloma cell lines, xenograft mouse models\",\n      \"pmids\": [\"25314077\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Breadth of efficacy beyond multiple myeloma not established here\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Refined the GADD45B-MKK7 interaction surface and DTP3 mechanism at residue level, mapping GADD45B loop 2 to the MKK7 enzymatic pocket.\",\n      \"evidence\": \"Enzymatic MS footprinting, diazirine cross-linking MS, MKK7 deletion-variant binding\",\n      \"pmids\": [\"29572137\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No high-resolution co-crystal structure of the complex\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Uncovered a non-kinase nuclear/cytoplasmic function: GADD45B dissolves G3BP1 autoinhibition to promote stress granule assembly and type I interferon signaling during RNA virus infection.\",\n      \"evidence\": \"Gadd45\\u03b2 KO mice, viral infection, co-IP with G3BP1, conformational and SG assembly assays, IFN readouts\",\n      \"pmids\": [\"37917584\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of G3BP1 conformational expansion not resolved\", \"Relationship to GADD45B's MAPK roles in antiviral defense unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Extended GADD45B to disease tissue by showing dual p38-dependent and p38-independent (FOS-interacting) mechanisms driving airway inflammation and epithelial senescence in COPD.\",\n      \"evidence\": \"Gadd45b KO mice with cigarette-smoke exposure, bidirectional modulation in HBE cells, GADD45B-FOS interaction, promoter bisulfite sequencing\",\n      \"pmids\": [\"38342401\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"GADD45B-FOS interaction mechanism not structurally defined\", \"Single-lab disease model\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How GADD45B selects among its many mutually opposing outputs (JNK inhibition vs p38 activation, apoptosis vs survival, autophagy inhibition, demethylation, stress-granule assembly) in a given cellular context remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model for context-dependent partner selection\", \"No experimental high-resolution structure of GADD45B in complex with any partner\", \"Enzymatic basis of GADD45B-facilitated DNA demethylation undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 2, 8, 13]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 2, 8, 13, 25]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [14]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [2, 19, 21, 25]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [24, 25]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 2, 8, 19]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1, 5]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [19, 25]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [0, 4, 10, 18]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [9, 26]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"MKK7\", \"MEKK4\", \"CDK1\", \"CCNB1\", \"PCNA\", \"CDKN1A\", \"G3BP1\", \"NR1I3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}