{"gene":"GMEB1","run_date":"2026-06-10T01:55:21","timeline":{"discoveries":[{"year":1995,"finding":"GMEB1 (88 kDa) and GMEB2 (67 kDa) were partially purified and characterized as two novel proteins that bind the glucocorticoid modulatory element (GME/CRE) as a heteromeric macromolecular complex of ~550 kDa (dissociable by deoxycholate), distinct from CREB/CREM/ATF family members, and capable of modulating glucocorticoid receptor transactivation properties (EC50 shift and partial agonist activity of antagonists).","method":"Partial protein purification, gel shift assays, size exclusion chromatography, molecular weight determination, partial peptide sequencing","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal biochemical methods (purification, gel shift, size exclusion, sequencing), foundational characterization replicated in subsequent work","pmids":["7665613"],"is_preprint":false},{"year":1998,"finding":"GMEB2 (67 kDa, cloned by PCR/RACE) binds GME DNA in gel shift assays; its binding to GME DNA increases markedly when mixed with authentic GMEB-1, forming a heteromeric complex similar to that from HTC cell cytosol. GMEB2 shares the KDWKR domain with Drosophila DEAF-1, rat Suppressin, and C. elegans ORFs, defining a novel protein family.","method":"cDNA cloning, in vitro transcription/translation, gel shift assay, co-incubation with GMEB-1","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro binding reconstitution, cloning with sequence verification, replicated in multiple subsequent studies","pmids":["9651376"],"is_preprint":false},{"year":1999,"finding":"Human GMEB1 (hGMEB1, 573 aa, 85 kDa) was cloned using HSP27 as bait in a yeast two-hybrid screen. In vitro translated hGMEB1 bound specifically to GME oligonucleotides, forming a complex of similar size to that from rat liver nuclear extracts (confirmed by supershift with anti-hGMEB1 antibody). Co-immunoprecipitation confirmed the in vivo interaction of HSP27 with hGMEB1.","method":"Yeast two-hybrid screening, cDNA cloning, in vitro translation, EMSA/gel shift with supershift, co-immunoprecipitation","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — yeast two-hybrid + co-IP + in vitro binding, single lab but multiple orthogonal methods","pmids":["10386584"],"is_preprint":false},{"year":2000,"finding":"GMEB-1 interacts with glucocorticoid receptor (GR) as shown by mammalian two-hybrid and pull-down assays. GMEB-1 possesses intrinsic transactivation activity in mammalian one-hybrid assays. Overexpression of GMEB-1 (alone or with GMEB-2) causes a reversible right shift in the GR dose-response curve and decreased partial agonist activity of antisteroids. Both GMEBs interact with CREB-binding protein (CBP) in two-hybrid assays; neither possesses histone acetyltransferase (HAT) activity. GMEB-1 and -2 share a 90-aa region (~80% identical) containing the KDWK core.","method":"Mammalian two-hybrid assay, GST pull-down, mammalian one-hybrid transactivation assay, reporter gene assay, HAT activity assay","journal":"Molecular endocrinology (Baltimore, Md.)","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — multiple orthogonal methods (two-hybrid, pull-down, reporter assay, enzymatic assay), single lab","pmids":["10894151"],"is_preprint":false},{"year":2000,"finding":"GME activity requires positioning within ~250 bp upstream of a tandem GRE driving a complex promoter; phasing between GME and downstream GREs is unimportant (unlike GREs); the GME does not affect GR binding to a single GRE. Changes in GME activity did not correlate with fold induction from the GRE, indicating that GME and GRE activities utilize parallel rather than common pathways.","method":"Transient transfection reporter gene assays with positional/distance mutants, gel shift assays","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic reporter assays with multiple mutant constructs, single lab","pmids":["10854715"],"is_preprint":false},{"year":2000,"finding":"Mouse GMEB-1 was identified by yeast two-hybrid screening using the activation domain 2 of nuclear receptor coactivator TIF2 as bait. In vitro translated mGMEB-1 bound specifically to GME oligonucleotides alone and as a heterodimer with rGMEB-2. Transient transfection with TAT promoter reporter genes indicated a role as a transcriptional regulator of the TAT promoter.","method":"Yeast two-hybrid screening, in vitro translation, EMSA/gel shift, transient transfection reporter assay","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid + in vitro binding + reporter assay, single lab, ortholog (mouse)","pmids":["10692587"],"is_preprint":false},{"year":2002,"finding":"GMEB-1 domains were mapped for distinct activities: homooligomerization, heterooligomerization, DNA binding, binding to GR, binding to CBP, and GR modulation each require defined regions. The domain for GR modulation and the domain for intrinsic transactivation activity do not overlap, providing a structural basis for the independence of dose-response curve modulation from total levels of GR-induced gene expression.","method":"Deletion/truncation mutagenesis, mammalian two-hybrid assay, DNA binding assays, reporter gene assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — systematic structure-function mutagenesis with multiple functional readouts, single lab","pmids":["11934901"],"is_preprint":false},{"year":2002,"finding":"MURF-1 binds GMEB-1 (a transcriptional regulator) in vitro. Endogenous MURF-1 was detected in nuclei of some myocytes, suggesting that MURF-1's interaction with GMEB-1 may link myofibril signaling to muscle gene expression.","method":"In vitro binding assay, immunofluorescence/subcellular fractionation","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — in vitro binding plus localization data, but functional link between MURF-1/GMEB1 interaction and nuclear function not directly tested","pmids":["11927605"],"is_preprint":false},{"year":2002,"finding":"GMEBs contact Ubc9 (mammalian E2 SUMO-conjugating enzyme), which also binds GR. Ubc9 modifies GR-induced gene expression (amount, fold induction, EC50, partial agonist activity) in a manner independent of its SUMO-1 transfer activity. The GME is proposed to act by increasing the local concentration of Ubc9 near the transcription machinery.","method":"Co-immunoprecipitation, reporter gene assay, transfection with Ubc9 mutants (SUMO-transfer deficient)","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus functional reporter assays with SUMO-dead mutant, single lab","pmids":["11812797"],"is_preprint":false},{"year":2003,"finding":"The 1.55 Å crystal structure of the GMEB1 SAND domain was determined. NMR and binding studies mapped DNA recognition to an alpha-helical region exposing the conserved KDWK motif. Site-directed mutagenesis identified key residues for DNA binding. The GMEB1 SAND domain also contains a zinc-binding motif (absent in Sp100b SAND domain); zinc is not required for DNA binding but determines C-terminal conformation of the domain.","method":"X-ray crystallography (1.55 Å), NMR spectroscopy, site-directed mutagenesis, DNA binding assays","journal":"Molecular endocrinology (Baltimore, Md.)","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution crystal structure + NMR + mutagenesis in a single study, multiple orthogonal methods","pmids":["12702733"],"is_preprint":false},{"year":2004,"finding":"GMEB1 binds to the prodomain (CARD) of procaspase-2 and inhibits its autoproteolytic activation by oligomerization in a chemical compound-dependent system, identifying GMEB1 as an endogenous inhibitor of procaspase-2 autoactivation.","method":"Co-immunoprecipitation, in vitro binding to procaspase-2 prodomain, caspase activation assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding assay plus functional caspase activation assay, single lab","pmids":["15555560"],"is_preprint":false},{"year":2004,"finding":"GMEB-2 structure/activity relationships mirror those of GMEB-1: homo- and heterooligomerization, GR binding, CBP binding, DNA binding, and GR transactivation modulation each require large regions of the protein; only intrinsic transactivation activity could be localized to a small region. Quantitative differences between GMEB-1 and -2 activities arise from amino acid sequence variation rather than global structural differences.","method":"Deletion/truncation mutagenesis, mammalian two-hybrid assay, DNA binding assays, reporter gene assays","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic structure-function mutagenesis, single lab, complements GMEB-1 study","pmids":["14705952"],"is_preprint":false},{"year":2006,"finding":"GMEB1 binds to procaspase-8 and procaspase-9 (in addition to procaspase-2) via their prodomains. GMEB1 attenuates Fas-mediated caspase-8 and -9 activation and subsequent apoptosis. siRNA knockdown of endogenous GMEB1 renders cells more sensitive to stress-induced apoptosis. Transgenic mice with neurospecific GMEB1 overexpression exhibit smaller cerebral infarcts and less brain swelling after transient focal ischemia.","method":"Co-immunoprecipitation, siRNA knockdown, caspase activation assays, transgenic mouse model with focal ischemia","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (co-IP, RNAi, in vivo transgenic model), replicated across caspase substrates","pmids":["16497673"],"is_preprint":false},{"year":2008,"finding":"GMEB1 prevents caspase activation and apoptosis in human neuroblastoma SK-N-MC cells subjected to hypoxia or oxidative stress, confirming its role as an endogenous inhibitor of initiator caspase activation in response to diverse stress stimuli.","method":"Caspase activation assays, cell viability/apoptosis assays under hypoxia and oxidative stress","journal":"Neuroscience letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional assays in neuronal cells confirming prior mechanistic finding, single lab","pmids":["18455874"],"is_preprint":false},{"year":2009,"finding":"GMEB1/PIF p96 interacts with the N-terminal domain of RAG1 as identified by yeast two-hybrid assay. A WW-like motif within RAG1's N-terminal domain mediates this interaction; point mutations at conserved WW residues abolished binding. A luciferase reporter assay demonstrated that a protein complex containing RAG proteins and GMEB1 can assemble in cells.","method":"Yeast two-hybrid assay, point mutagenesis, luciferase reporter assay","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — yeast two-hybrid confirmed by mutagenesis and reporter assay, single lab","pmids":["19324890"],"is_preprint":false},{"year":2011,"finding":"IL-12 induces GMEB1 expression in human T cells. siRNA knockdown of GMEB1 reverses the protective effect of IL-12 on dexamethasone-induced T cell apoptosis, placing GMEB1 downstream of IL-12/PI3K/Akt signaling as a mediator of anti-apoptotic protection against glucocorticoid-induced apoptosis.","method":"siRNA knockdown, apoptosis assays (flow cytometry), qPCR, PI3K inhibitor treatment","journal":"Immunobiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis by siRNA knockdown with functional apoptosis readout, single lab","pmids":["21840619"],"is_preprint":false},{"year":2012,"finding":"GMEB1 was identified as a novel binding partner of FOXL2 transcription factor by yeast two-hybrid screening and confirmed by co-immunoprecipitation. GMEB1 is sequestered in aggregates formed by BPES-causing FOXL2 mutants. On most promoters GMEB1 acts as a transcriptional repressor; it increases wild-type FOXL2 activity on the Per2 promoter and to a greater extent increases the activity of the oncogenic p.C134W FOXL2 variant.","method":"Yeast two-hybrid screening, co-immunoprecipitation, immunofluorescence (aggregate sequestration), luciferase reporter assays","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP + reporter assay + localization, single lab","pmids":["22544055"],"is_preprint":false},{"year":2019,"finding":"GMEB1 interacts with CFLARL (c-FLIPL) in the cytosol and promotes its stability. The deubiquitinase USP40 catalyzes K48-linked deubiquitination of CFLARL; GMEB1 acts as a bridge protein promoting the binding of USP40 to CFLARL. USP40 knockdown abolishes GMEB1-mediated CFLARL stabilization. GMEB1 inhibits pro-caspase-8 activation and DISC formation upon TRAIL stimulation; CFLARL enhances the binding of GMEB1 to CASP8. GMEB1 knockdown inhibits A549 xenograft tumor growth in vivo.","method":"Co-immunoprecipitation, GST pull-down, Western blot (ubiquitination), immunofluorescence, flow cytometry (apoptosis), shRNA knockdown, xenograft mouse model","journal":"Journal of experimental & clinical cancer research : CR","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (co-IP, pull-down, ubiquitination assay, in vivo xenograft), functional epistasis established","pmids":["31046799"],"is_preprint":false},{"year":2019,"finding":"In midbrain dopamine (mDA) neurons, Gmeb1 was identified as a transcription factor regulating expression of Th (tyrosine hydroxylase) and Dat (dopamine transporter). Gmeb1 knockdown in mDA neurons caused downregulation of Th and Dat and severe motor deficits, establishing Gmeb1 as a master regulator of mDA gene expression and function.","method":"Virus-based nuclear capture, RNA-seq, DNase-seq (chromatin accessibility), predictive modeling, in vivo AAV-mediated Gmeb1 knockdown with behavioral readout","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo loss-of-function with defined molecular (Th, Dat downregulation) and behavioral phenotype, multiple genomic methods to identify targets","pmids":["31175277"],"is_preprint":false},{"year":2020,"finding":"TRAF3 interacts with GMEB1 as identified by yeast two-hybrid screening of a human B cell cDNA library and confirmed by co-immunoprecipitation in mammalian cells. TRAF3 overexpression enhances GMEB1's anti-apoptotic function; TRAF3 siRNA knockdown significantly reduces GMEB1-mediated inhibition of apoptosis. The RING and TRAF-C domains of TRAF3 are not required for this interaction.","method":"Yeast two-hybrid screening, co-immunoprecipitation, siRNA knockdown, cell viability/apoptosis assays","journal":"Journal of biological research (Thessalonike, Greece)","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — yeast two-hybrid confirmed by co-IP with domain mapping, functional epistasis by siRNA, single lab","pmids":["32514408"],"is_preprint":false},{"year":2021,"finding":"CircGlis3 promotes the degradation of GMEB1 by facilitating the interaction between GMEB1 and the E3 ubiquitin ligase MIB2, thereby suppressing GMEB1-dependent phosphorylation of HSP27.","method":"RNA pull-down, co-immunoprecipitation, Western blot (protein stability/ubiquitination), gain/loss-of-function assays","journal":"Diabetologia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and RNA pull-down with functional HSP27 phosphorylation readout, single lab","pmids":["34751796"],"is_preprint":false},{"year":2023,"finding":"GMEB1 binds to the YAP1 promoter region and positively regulates YAP1 expression in hepatocellular carcinoma cells. GMEB1 binding to the YAP1 promoter was confirmed by dual-luciferase reporter assay and chromatin immunoprecipitation-qPCR.","method":"Chromatin immunoprecipitation-qPCR, dual-luciferase reporter assay, Western blot, qRT-PCR, gain/loss-of-function (overexpression/knockdown)","journal":"World journal of gastrointestinal oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-qPCR plus luciferase reporter validation, single lab","pmids":["37389116"],"is_preprint":false}],"current_model":"GMEB1 is a multifunctional nuclear/cytoplasmic protein whose SAND domain (containing the conserved KDWK motif and a zinc-binding motif) mediates sequence-specific DNA binding to the glucocorticoid modulatory element (GME); it forms a ~550 kDa heteromeric complex with GMEB2 to modulate glucocorticoid receptor transactivation (shifting the agonist dose-response curve and partial agonist activity of antagonists) by recruiting cofactors including CBP and Ubc9; in the cytoplasm, GMEB1 acts as an endogenous anti-apoptotic factor by binding to the prodomains of initiator procaspases (caspase-2, -8, -9), blocking their oligomerization and activation, and by acting as a bridge protein that recruits the deubiquitinase USP40 to stabilize CFLARL and inhibit DISC formation; GMEB1 is also targeted for MIB2-mediated ubiquitination and degradation, which suppresses GMEB1-dependent HSP27 phosphorylation; it interacts with HSP27, TRAF3, RAG1, and FOXL2 through distinct domains; and in midbrain dopamine neurons, Gmeb1 functions as a master transcriptional regulator of tyrosine hydroxylase (Th) and dopamine transporter (Dat) expression."},"narrative":{"mechanistic_narrative":"GMEB1 is a dual-function regulator that operates both as a sequence-specific DNA-binding transcriptional modulator and as a cytoplasmic anti-apoptotic factor. It was first defined biochemically as a subunit of a ~550 kDa heteromeric complex with GMEB2 that binds the glucocorticoid modulatory element (GME) and reshapes glucocorticoid receptor transactivation—shifting the agonist dose-response curve and the partial agonist activity of antisteroids [PMID:7665613, PMID:10894151]. Sequence-specific DNA recognition is mediated by its SAND domain, whose 1.55 Å crystal structure positions the conserved KDWK motif on an exposed α-helix for DNA contact and contains a zinc-binding motif that sets the domain's C-terminal conformation without being required for binding [PMID:12702733]. GMEB1 carries intrinsic transactivation activity through a domain separable from its GR-modulation domain, and it modulates GR not by directly altering GR–GRE binding but through parallel cofactor recruitment, engaging CBP and the SUMO-conjugating enzyme Ubc9 [PMID:10894151, PMID:11934901, PMID:11812797]. As a transcription factor in its own right, GMEB1 controls midbrain dopamine neuron identity by driving tyrosine hydroxylase and dopamine transporter expression, with knockdown producing motor deficits [PMID:31175277], and it directs context-specific gene programs through partners such as FOXL2 and promoters including YAP1 [PMID:22544055, PMID:37389116]. In the cytoplasm, GMEB1 is an endogenous inhibitor of initiator caspase activation: it binds the prodomains of procaspase-2, -8, and -9 to block their oligomerization-dependent activation, protecting cells against diverse stress stimuli and limiting ischemic brain injury in vivo [PMID:15555560, PMID:16497673, PMID:18455874]. It additionally suppresses death-receptor signaling by bridging the deubiquitinase USP40 to CFLARL, stabilizing CFLARL and inhibiting DISC formation upon TRAIL stimulation [PMID:31046799]. GMEB1 abundance and activity are tuned by ubiquitin-dependent turnover via the E3 ligase MIB2, which suppresses GMEB1-dependent HSP27 phosphorylation [PMID:34751796].","teleology":[{"year":1995,"claim":"Established the existence and biochemical identity of GME-binding activity, defining GMEB1/GMEB2 as a novel heteromeric complex distinct from known CRE-binding factors that modulates glucocorticoid receptor behavior.","evidence":"Partial protein purification, gel shift, size exclusion chromatography and peptide sequencing from cell cytosol","pmids":["7665613"],"confidence":"High","gaps":["Component proteins not yet cloned","Molecular mechanism of GR modulation undefined"]},{"year":1998,"claim":"Cloning of GMEB2 and demonstration of cooperative GME binding with GMEB1 placed both proteins in a new KDWK-family and reconstituted the heteromeric DNA-binding complex.","evidence":"cDNA cloning, in vitro translation, gel shift with co-incubation","pmids":["9651376"],"confidence":"High","gaps":["Structural basis of cooperativity unknown","In vivo functional consequence not addressed"]},{"year":1999,"claim":"Cloning of human GMEB1 and identification of HSP27 as a partner provided the human reagent and an early protein interaction beyond the GMEB2 complex.","evidence":"Yeast two-hybrid (HSP27 bait), cloning, EMSA/supershift, co-IP","pmids":["10386584"],"confidence":"High","gaps":["Functional role of HSP27 interaction not established","Subcellular partitioning not resolved"]},{"year":2000,"claim":"Defined how GMEB1 modulates GR transactivation—via intrinsic transactivation activity, direct GR and CBP interactions, and a dose-response shift—rather than altering GR-GRE occupancy.","evidence":"Mammalian one/two-hybrid, GST pull-down, reporter assays, HAT assays; positional GME reporter mutants","pmids":["10894151","10854715","10692587"],"confidence":"High","gaps":["Cofactor recruitment mechanism not yet molecular","Endogenous target genes beyond TAT reporter unknown"]},{"year":2002,"claim":"Structure-function mapping separated GMEB1 activities into distinct domains and identified Ubc9 as a functional cofactor, providing a mechanistic basis for independent control of EC50 versus total GR-induced expression.","evidence":"Deletion mutagenesis with two-hybrid/DNA-binding/reporter readouts; co-IP and SUMO-transfer-dead Ubc9 mutants; in vitro MURF-1 binding","pmids":["11934901","11812797","11927605"],"confidence":"High","gaps":["Functional relevance of MURF-1 interaction untested","How Ubc9 local concentration alters transcription not directly shown"]},{"year":2003,"claim":"The SAND domain crystal structure resolved the DNA-recognition surface (KDWK motif) and a zinc-binding motif, establishing the atomic basis of sequence-specific DNA binding.","evidence":"X-ray crystallography (1.55 Å), NMR, site-directed mutagenesis, DNA binding assays","pmids":["12702733"],"confidence":"High","gaps":["Structure of full-length complex on DNA absent","Role of zinc conformation in vivo not defined"]},{"year":2006,"claim":"Extended GMEB1's anti-apoptotic role from procaspase-2 to procaspase-8 and -9 and demonstrated physiological protection in vivo, revealing a cytoplasmic function distinct from its transcriptional role.","evidence":"Co-IP, in vitro prodomain binding, caspase activation assays, siRNA, neurospecific transgenic mice with focal ischemia","pmids":["15555560","16497673"],"confidence":"High","gaps":["Determinants of cytoplasmic versus nuclear localization unknown","Stoichiometry of caspase prodomain blockade unresolved"]},{"year":2008,"claim":"Confirmed GMEB1 inhibits initiator caspase activation across hypoxic and oxidative stress, generalizing its cytoprotective mechanism.","evidence":"Caspase activation and viability assays under hypoxia and oxidative stress in neuroblastoma cells","pmids":["18455874"],"confidence":"Medium","gaps":["Single cell-line context","Upstream regulators of GMEB1 under stress not identified here"]},{"year":2011,"claim":"Placed GMEB1 downstream of IL-12/PI3K/Akt signaling as the effector mediating anti-apoptotic protection against glucocorticoid-induced T-cell death.","evidence":"siRNA knockdown, apoptosis flow cytometry, qPCR, PI3K inhibition","pmids":["21840619"],"confidence":"Medium","gaps":["Direct biochemical link to PI3K/Akt not shown","Whether transcriptional or caspase-binding function mediates the effect unclear"]},{"year":2012,"claim":"Identified FOXL2 as a transcriptional partner and showed GMEB1 acts mainly as a repressor but enhances activity of an oncogenic FOXL2 variant, broadening its transcriptional partnerships.","evidence":"Yeast two-hybrid, co-IP, immunofluorescence (aggregate sequestration), luciferase reporters","pmids":["22544055"],"confidence":"Medium","gaps":["Endogenous co-regulated genes not mapped","Mechanism of promoter-specific switch from repression to activation unknown"]},{"year":2019,"claim":"Defined a death-receptor-specific anti-apoptotic mechanism (USP40-mediated CFLARL stabilization via GMEB1 bridging) and established GMEB1 as a master transcriptional regulator of dopaminergic neuron identity.","evidence":"Co-IP/pull-down, ubiquitination assays, shRNA, xenograft; nuclear capture RNA-seq/DNase-seq with in vivo AAV knockdown and behavioral readout","pmids":["31046799","31175277"],"confidence":"High","gaps":["Direct DNA-binding sites at Th/Dat loci not structurally defined","Cross-talk between transcriptional and DISC-inhibitory functions unexplored"]},{"year":2020,"claim":"Identified TRAF3 as a partner that potentiates GMEB1's anti-apoptotic function, adding a regulatory input to caspase-inhibitory activity.","evidence":"Yeast two-hybrid, co-IP with domain mapping, siRNA, apoptosis assays","pmids":["32514408"],"confidence":"Medium","gaps":["Domain on GMEB1 mediating TRAF3 binding not mapped","Mechanism by which TRAF3 enhances protection unclear"]},{"year":2021,"claim":"Revealed ubiquitin-dependent control of GMEB1 levels through MIB2, linking GMEB1 turnover to suppression of HSP27 phosphorylation.","evidence":"RNA pull-down, co-IP, Western blot for stability/ubiquitination, gain/loss of function","pmids":["34751796"],"confidence":"Medium","gaps":["Ubiquitination sites on GMEB1 not mapped","How GMEB1 drives HSP27 phosphorylation mechanistically unknown"]},{"year":2023,"claim":"Showed GMEB1 directly activates YAP1 transcription in hepatocellular carcinoma, extending its DNA-binding transcriptional role to a cancer-relevant target.","evidence":"ChIP-qPCR, dual-luciferase reporter, qRT-PCR, gain/loss of function","pmids":["37389116"],"confidence":"Medium","gaps":["Binding motif at YAP1 promoter not defined","Whether GMEB2/cofactors participate not addressed"]},{"year":null,"claim":"How GMEB1's nuclear transcriptional functions and cytoplasmic caspase/DISC-inhibitory functions are partitioned, coordinated, and switched within a cell remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No determinant of nucleo-cytoplasmic localization identified","No unified model linking transcriptional and anti-apoptotic roles","Genome-wide direct targets largely undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,2,9,21]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[3,16,18,21]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[3,10,12,17]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[17]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,2,18]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[10,12,17]}],"pathway":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[3,18]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[10,12,17]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[3,18,21]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,17]}],"complexes":["GMEB1-GMEB2 GME-binding complex"],"partners":["GMEB2","NR3C1","CREBBP","UBE2I","CASP8","CFLAR","USP40","FOXL2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y692","full_name":"Glucocorticoid modulatory element-binding protein 1","aliases":["DNA-binding protein p96PIF","Parvovirus initiation factor p96","PIF p96"],"length_aa":573,"mass_kda":62.6,"function":"Acts as a DNA-binding transcriptional regulator involved in modulating the expression of genes responsive to glucocorticoid signaling (PubMed:12702733). Specifically binds AT-rich DNA motifs known as glucocorticoid modulatory elements (GMEs), repressing or enhancing transcription depending on cellular context (PubMed:10894151). Forms heterodimeric complexes with GMEB2, which enhances its DNA-binding specificity and transcriptional activity. This complex plays a critical role in the repression of glucocorticoid receptor (GR/NR3C1) transcriptional activity, acting as a negative modulator of glucocorticoid signaling (PubMed:10894151). Regulates dopamine-enriched midbrain genes, including tyrosine hydroxylase/TH and the dopamine transporter SLC6A3, essential for dopamine signaling (By similarity). Also binds the transferrin receptor promoter. In the cytoplasm, inhibits caspase activation and neuronal apoptosis by stabilizing CFLARL and blocking pro-caspase 8 activation (PubMed:31046799, PubMed:32514408)","subcellular_location":"Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9Y692/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/GMEB1","classification":"Not Classified","n_dependent_lines":15,"n_total_lines":1208,"dependency_fraction":0.012417218543046357},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/GMEB1","total_profiled":1310},"omim":[{"mim_id":"607451","title":"GLUCOCORTICOID MODULATORY ELEMENT-BINDING PROTEIN 2; GMEB2","url":"https://www.omim.org/entry/607451"},{"mim_id":"604409","title":"GLUCOCORTICOID MODULATORY ELEMENT-BINDING PROTEIN 1; GMEB1","url":"https://www.omim.org/entry/604409"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/GMEB1"},"hgnc":{"alias_symbol":["P96PIF","PIF96"],"prev_symbol":[]},"alphafold":{"accession":"Q9Y692","domains":[{"cath_id":"3.10.390.10","chopping":"91-180","consensus_level":"medium","plddt":91.9569,"start":91,"end":180},{"cath_id":"1.10.287","chopping":"268-311","consensus_level":"medium","plddt":84.3475,"start":268,"end":311},{"cath_id":"1.10.287","chopping":"322-364","consensus_level":"medium","plddt":86.8995,"start":322,"end":364}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y692","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y692-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y692-F1-predicted_aligned_error_v6.png","plddt_mean":56.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GMEB1","jax_strain_url":"https://www.jax.org/strain/search?query=GMEB1"},"sequence":{"accession":"Q9Y692","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y692.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y692/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y692"}},"corpus_meta":[{"pmid":"11927605","id":"PMC_11927605","title":"Muscle-specific RING finger-1 interacts with titin to regulate sarcomeric M-line and thick filament structure and may have nuclear functions via its interaction with glucocorticoid modulatory element binding protein-1.","date":"2002","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/11927605","citation_count":200,"is_preprint":false},{"pmid":"11812797","id":"PMC_11812797","title":"Ubc9 is a novel modulator of the induction properties of glucocorticoid receptors.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11812797","citation_count":78,"is_preprint":false},{"pmid":"7665613","id":"PMC_7665613","title":"The factor binding to the glucocorticoid modulatory element of the tyrosine aminotransferase gene is a novel and ubiquitous heteromeric complex.","date":"1995","source":"The Journal of biological 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Characterization of domains relevant for the modulation of glucocorticoid receptor transactivation properties.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11934901","citation_count":17,"is_preprint":false},{"pmid":"10692587","id":"PMC_10692587","title":"Cloning of a mouse glucocorticoid modulatory element binding protein, a new member of the KDWK family.","date":"2000","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/10692587","citation_count":15,"is_preprint":false},{"pmid":"18455874","id":"PMC_18455874","title":"GMEB1, a novel endogenous caspase inhibitor, prevents hypoxia- and oxidative stress-induced neuronal apoptosis.","date":"2008","source":"Neuroscience letters","url":"https://pubmed.ncbi.nlm.nih.gov/18455874","citation_count":14,"is_preprint":false},{"pmid":"15555560","id":"PMC_15555560","title":"Regulation of procaspase-2 by glucocorticoid modulatory element-binding protein 1 through the interaction with caspase recruitment domain.","date":"2004","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/15555560","citation_count":12,"is_preprint":false},{"pmid":"19324890","id":"PMC_19324890","title":"A WW-like module in the RAG1 N-terminal domain contributes to previously unidentified protein-protein interactions.","date":"2009","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/19324890","citation_count":10,"is_preprint":false},{"pmid":"32514408","id":"PMC_32514408","title":"TRAF3 can interact with GMEB1 and modulate its anti-apoptotic function.","date":"2020","source":"Journal of biological research (Thessalonike, Greece)","url":"https://pubmed.ncbi.nlm.nih.gov/32514408","citation_count":9,"is_preprint":false},{"pmid":"31175277","id":"PMC_31175277","title":"In vivo nuclear capture and molecular profiling identifies Gmeb1 as a transcriptional regulator essential for dopamine neuron function.","date":"2019","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/31175277","citation_count":9,"is_preprint":false},{"pmid":"14705952","id":"PMC_14705952","title":"Structure/activity relationships for GMEB-2: the second member of the glucocorticoid modulatory element-binding complex.","date":"2004","source":"Biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/14705952","citation_count":7,"is_preprint":false},{"pmid":"33617082","id":"PMC_33617082","title":"Withdrawn: Z. Cui, Q. Sun, W. Yan, Q. Han, G. Wang, Y. Hu. The role of miR-320a and its target gene GMEB1 in epithelial-mesenchymal transition and invasion of colorectal cancer, published in The Journal of Gene Medicine.","date":"2023","source":"The journal of gene medicine","url":"https://pubmed.ncbi.nlm.nih.gov/33617082","citation_count":6,"is_preprint":false},{"pmid":"36980306","id":"PMC_36980306","title":"Chromatin Accessibility and Transcriptional Landscape during Inhibition of Salmonella enterica by Lactobacillus reuteri in IPEC-J2 Cells.","date":"2023","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/36980306","citation_count":5,"is_preprint":false},{"pmid":"35546387","id":"PMC_35546387","title":"Identification of functionally important miRNA targeted genes associated with child obesity trait in genome-wide association studies.","date":"2022","source":"BMC genomics","url":"https://pubmed.ncbi.nlm.nih.gov/35546387","citation_count":4,"is_preprint":false},{"pmid":"37389116","id":"PMC_37389116","title":"Transcription factor glucocorticoid modulatory element-binding protein 1 promotes hepatocellular carcinoma progression by activating Yes-associate protein 1.","date":"2023","source":"World journal of gastrointestinal oncology","url":"https://pubmed.ncbi.nlm.nih.gov/37389116","citation_count":2,"is_preprint":false},{"pmid":"30581382","id":"PMC_30581382","title":"From Matrices to Knowledge: Using Semantic Networks to Annotate the Connectome.","date":"2018","source":"Frontiers in neuroanatomy","url":"https://pubmed.ncbi.nlm.nih.gov/30581382","citation_count":2,"is_preprint":false},{"pmid":"41652412","id":"PMC_41652412","title":"Genome-wide profiling of salivary promoter-region DNA methylation in periodontitis: the Tromsø Study.","date":"2026","source":"BMC medical genomics","url":"https://pubmed.ncbi.nlm.nih.gov/41652412","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":17148,"output_tokens":5800,"usd":0.069222,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14302,"output_tokens":4575,"usd":0.092942,"stage2_stop_reason":"end_turn"},"total_usd":0.162164,"stage1_batch_id":"msgbatch_01DUPACZi7AAWwuZiUjseQF4","stage2_batch_id":"msgbatch_018yt7chE3f48PEFtDwtj6AE","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1995,\n      \"finding\": \"GMEB1 (88 kDa) and GMEB2 (67 kDa) were partially purified and characterized as two novel proteins that bind the glucocorticoid modulatory element (GME/CRE) as a heteromeric macromolecular complex of ~550 kDa (dissociable by deoxycholate), distinct from CREB/CREM/ATF family members, and capable of modulating glucocorticoid receptor transactivation properties (EC50 shift and partial agonist activity of antagonists).\",\n      \"method\": \"Partial protein purification, gel shift assays, size exclusion chromatography, molecular weight determination, partial peptide sequencing\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal biochemical methods (purification, gel shift, size exclusion, sequencing), foundational characterization replicated in subsequent work\",\n      \"pmids\": [\"7665613\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"GMEB2 (67 kDa, cloned by PCR/RACE) binds GME DNA in gel shift assays; its binding to GME DNA increases markedly when mixed with authentic GMEB-1, forming a heteromeric complex similar to that from HTC cell cytosol. GMEB2 shares the KDWKR domain with Drosophila DEAF-1, rat Suppressin, and C. elegans ORFs, defining a novel protein family.\",\n      \"method\": \"cDNA cloning, in vitro transcription/translation, gel shift assay, co-incubation with GMEB-1\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro binding reconstitution, cloning with sequence verification, replicated in multiple subsequent studies\",\n      \"pmids\": [\"9651376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Human GMEB1 (hGMEB1, 573 aa, 85 kDa) was cloned using HSP27 as bait in a yeast two-hybrid screen. In vitro translated hGMEB1 bound specifically to GME oligonucleotides, forming a complex of similar size to that from rat liver nuclear extracts (confirmed by supershift with anti-hGMEB1 antibody). Co-immunoprecipitation confirmed the in vivo interaction of HSP27 with hGMEB1.\",\n      \"method\": \"Yeast two-hybrid screening, cDNA cloning, in vitro translation, EMSA/gel shift with supershift, co-immunoprecipitation\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — yeast two-hybrid + co-IP + in vitro binding, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"10386584\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"GMEB-1 interacts with glucocorticoid receptor (GR) as shown by mammalian two-hybrid and pull-down assays. GMEB-1 possesses intrinsic transactivation activity in mammalian one-hybrid assays. Overexpression of GMEB-1 (alone or with GMEB-2) causes a reversible right shift in the GR dose-response curve and decreased partial agonist activity of antisteroids. Both GMEBs interact with CREB-binding protein (CBP) in two-hybrid assays; neither possesses histone acetyltransferase (HAT) activity. GMEB-1 and -2 share a 90-aa region (~80% identical) containing the KDWK core.\",\n      \"method\": \"Mammalian two-hybrid assay, GST pull-down, mammalian one-hybrid transactivation assay, reporter gene assay, HAT activity assay\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — multiple orthogonal methods (two-hybrid, pull-down, reporter assay, enzymatic assay), single lab\",\n      \"pmids\": [\"10894151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"GME activity requires positioning within ~250 bp upstream of a tandem GRE driving a complex promoter; phasing between GME and downstream GREs is unimportant (unlike GREs); the GME does not affect GR binding to a single GRE. Changes in GME activity did not correlate with fold induction from the GRE, indicating that GME and GRE activities utilize parallel rather than common pathways.\",\n      \"method\": \"Transient transfection reporter gene assays with positional/distance mutants, gel shift assays\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic reporter assays with multiple mutant constructs, single lab\",\n      \"pmids\": [\"10854715\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Mouse GMEB-1 was identified by yeast two-hybrid screening using the activation domain 2 of nuclear receptor coactivator TIF2 as bait. In vitro translated mGMEB-1 bound specifically to GME oligonucleotides alone and as a heterodimer with rGMEB-2. Transient transfection with TAT promoter reporter genes indicated a role as a transcriptional regulator of the TAT promoter.\",\n      \"method\": \"Yeast two-hybrid screening, in vitro translation, EMSA/gel shift, transient transfection reporter assay\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid + in vitro binding + reporter assay, single lab, ortholog (mouse)\",\n      \"pmids\": [\"10692587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"GMEB-1 domains were mapped for distinct activities: homooligomerization, heterooligomerization, DNA binding, binding to GR, binding to CBP, and GR modulation each require defined regions. The domain for GR modulation and the domain for intrinsic transactivation activity do not overlap, providing a structural basis for the independence of dose-response curve modulation from total levels of GR-induced gene expression.\",\n      \"method\": \"Deletion/truncation mutagenesis, mammalian two-hybrid assay, DNA binding assays, reporter gene assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — systematic structure-function mutagenesis with multiple functional readouts, single lab\",\n      \"pmids\": [\"11934901\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"MURF-1 binds GMEB-1 (a transcriptional regulator) in vitro. Endogenous MURF-1 was detected in nuclei of some myocytes, suggesting that MURF-1's interaction with GMEB-1 may link myofibril signaling to muscle gene expression.\",\n      \"method\": \"In vitro binding assay, immunofluorescence/subcellular fractionation\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — in vitro binding plus localization data, but functional link between MURF-1/GMEB1 interaction and nuclear function not directly tested\",\n      \"pmids\": [\"11927605\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"GMEBs contact Ubc9 (mammalian E2 SUMO-conjugating enzyme), which also binds GR. Ubc9 modifies GR-induced gene expression (amount, fold induction, EC50, partial agonist activity) in a manner independent of its SUMO-1 transfer activity. The GME is proposed to act by increasing the local concentration of Ubc9 near the transcription machinery.\",\n      \"method\": \"Co-immunoprecipitation, reporter gene assay, transfection with Ubc9 mutants (SUMO-transfer deficient)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus functional reporter assays with SUMO-dead mutant, single lab\",\n      \"pmids\": [\"11812797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The 1.55 Å crystal structure of the GMEB1 SAND domain was determined. NMR and binding studies mapped DNA recognition to an alpha-helical region exposing the conserved KDWK motif. Site-directed mutagenesis identified key residues for DNA binding. The GMEB1 SAND domain also contains a zinc-binding motif (absent in Sp100b SAND domain); zinc is not required for DNA binding but determines C-terminal conformation of the domain.\",\n      \"method\": \"X-ray crystallography (1.55 Å), NMR spectroscopy, site-directed mutagenesis, DNA binding assays\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution crystal structure + NMR + mutagenesis in a single study, multiple orthogonal methods\",\n      \"pmids\": [\"12702733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"GMEB1 binds to the prodomain (CARD) of procaspase-2 and inhibits its autoproteolytic activation by oligomerization in a chemical compound-dependent system, identifying GMEB1 as an endogenous inhibitor of procaspase-2 autoactivation.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding to procaspase-2 prodomain, caspase activation assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding assay plus functional caspase activation assay, single lab\",\n      \"pmids\": [\"15555560\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"GMEB-2 structure/activity relationships mirror those of GMEB-1: homo- and heterooligomerization, GR binding, CBP binding, DNA binding, and GR transactivation modulation each require large regions of the protein; only intrinsic transactivation activity could be localized to a small region. Quantitative differences between GMEB-1 and -2 activities arise from amino acid sequence variation rather than global structural differences.\",\n      \"method\": \"Deletion/truncation mutagenesis, mammalian two-hybrid assay, DNA binding assays, reporter gene assays\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic structure-function mutagenesis, single lab, complements GMEB-1 study\",\n      \"pmids\": [\"14705952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"GMEB1 binds to procaspase-8 and procaspase-9 (in addition to procaspase-2) via their prodomains. GMEB1 attenuates Fas-mediated caspase-8 and -9 activation and subsequent apoptosis. siRNA knockdown of endogenous GMEB1 renders cells more sensitive to stress-induced apoptosis. Transgenic mice with neurospecific GMEB1 overexpression exhibit smaller cerebral infarcts and less brain swelling after transient focal ischemia.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, caspase activation assays, transgenic mouse model with focal ischemia\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (co-IP, RNAi, in vivo transgenic model), replicated across caspase substrates\",\n      \"pmids\": [\"16497673\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"GMEB1 prevents caspase activation and apoptosis in human neuroblastoma SK-N-MC cells subjected to hypoxia or oxidative stress, confirming its role as an endogenous inhibitor of initiator caspase activation in response to diverse stress stimuli.\",\n      \"method\": \"Caspase activation assays, cell viability/apoptosis assays under hypoxia and oxidative stress\",\n      \"journal\": \"Neuroscience letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional assays in neuronal cells confirming prior mechanistic finding, single lab\",\n      \"pmids\": [\"18455874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"GMEB1/PIF p96 interacts with the N-terminal domain of RAG1 as identified by yeast two-hybrid assay. A WW-like motif within RAG1's N-terminal domain mediates this interaction; point mutations at conserved WW residues abolished binding. A luciferase reporter assay demonstrated that a protein complex containing RAG proteins and GMEB1 can assemble in cells.\",\n      \"method\": \"Yeast two-hybrid assay, point mutagenesis, luciferase reporter assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — yeast two-hybrid confirmed by mutagenesis and reporter assay, single lab\",\n      \"pmids\": [\"19324890\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"IL-12 induces GMEB1 expression in human T cells. siRNA knockdown of GMEB1 reverses the protective effect of IL-12 on dexamethasone-induced T cell apoptosis, placing GMEB1 downstream of IL-12/PI3K/Akt signaling as a mediator of anti-apoptotic protection against glucocorticoid-induced apoptosis.\",\n      \"method\": \"siRNA knockdown, apoptosis assays (flow cytometry), qPCR, PI3K inhibitor treatment\",\n      \"journal\": \"Immunobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis by siRNA knockdown with functional apoptosis readout, single lab\",\n      \"pmids\": [\"21840619\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"GMEB1 was identified as a novel binding partner of FOXL2 transcription factor by yeast two-hybrid screening and confirmed by co-immunoprecipitation. GMEB1 is sequestered in aggregates formed by BPES-causing FOXL2 mutants. On most promoters GMEB1 acts as a transcriptional repressor; it increases wild-type FOXL2 activity on the Per2 promoter and to a greater extent increases the activity of the oncogenic p.C134W FOXL2 variant.\",\n      \"method\": \"Yeast two-hybrid screening, co-immunoprecipitation, immunofluorescence (aggregate sequestration), luciferase reporter assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP + reporter assay + localization, single lab\",\n      \"pmids\": [\"22544055\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GMEB1 interacts with CFLARL (c-FLIPL) in the cytosol and promotes its stability. The deubiquitinase USP40 catalyzes K48-linked deubiquitination of CFLARL; GMEB1 acts as a bridge protein promoting the binding of USP40 to CFLARL. USP40 knockdown abolishes GMEB1-mediated CFLARL stabilization. GMEB1 inhibits pro-caspase-8 activation and DISC formation upon TRAIL stimulation; CFLARL enhances the binding of GMEB1 to CASP8. GMEB1 knockdown inhibits A549 xenograft tumor growth in vivo.\",\n      \"method\": \"Co-immunoprecipitation, GST pull-down, Western blot (ubiquitination), immunofluorescence, flow cytometry (apoptosis), shRNA knockdown, xenograft mouse model\",\n      \"journal\": \"Journal of experimental & clinical cancer research : CR\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (co-IP, pull-down, ubiquitination assay, in vivo xenograft), functional epistasis established\",\n      \"pmids\": [\"31046799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In midbrain dopamine (mDA) neurons, Gmeb1 was identified as a transcription factor regulating expression of Th (tyrosine hydroxylase) and Dat (dopamine transporter). Gmeb1 knockdown in mDA neurons caused downregulation of Th and Dat and severe motor deficits, establishing Gmeb1 as a master regulator of mDA gene expression and function.\",\n      \"method\": \"Virus-based nuclear capture, RNA-seq, DNase-seq (chromatin accessibility), predictive modeling, in vivo AAV-mediated Gmeb1 knockdown with behavioral readout\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo loss-of-function with defined molecular (Th, Dat downregulation) and behavioral phenotype, multiple genomic methods to identify targets\",\n      \"pmids\": [\"31175277\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRAF3 interacts with GMEB1 as identified by yeast two-hybrid screening of a human B cell cDNA library and confirmed by co-immunoprecipitation in mammalian cells. TRAF3 overexpression enhances GMEB1's anti-apoptotic function; TRAF3 siRNA knockdown significantly reduces GMEB1-mediated inhibition of apoptosis. The RING and TRAF-C domains of TRAF3 are not required for this interaction.\",\n      \"method\": \"Yeast two-hybrid screening, co-immunoprecipitation, siRNA knockdown, cell viability/apoptosis assays\",\n      \"journal\": \"Journal of biological research (Thessalonike, Greece)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — yeast two-hybrid confirmed by co-IP with domain mapping, functional epistasis by siRNA, single lab\",\n      \"pmids\": [\"32514408\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CircGlis3 promotes the degradation of GMEB1 by facilitating the interaction between GMEB1 and the E3 ubiquitin ligase MIB2, thereby suppressing GMEB1-dependent phosphorylation of HSP27.\",\n      \"method\": \"RNA pull-down, co-immunoprecipitation, Western blot (protein stability/ubiquitination), gain/loss-of-function assays\",\n      \"journal\": \"Diabetologia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and RNA pull-down with functional HSP27 phosphorylation readout, single lab\",\n      \"pmids\": [\"34751796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"GMEB1 binds to the YAP1 promoter region and positively regulates YAP1 expression in hepatocellular carcinoma cells. GMEB1 binding to the YAP1 promoter was confirmed by dual-luciferase reporter assay and chromatin immunoprecipitation-qPCR.\",\n      \"method\": \"Chromatin immunoprecipitation-qPCR, dual-luciferase reporter assay, Western blot, qRT-PCR, gain/loss-of-function (overexpression/knockdown)\",\n      \"journal\": \"World journal of gastrointestinal oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-qPCR plus luciferase reporter validation, single lab\",\n      \"pmids\": [\"37389116\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GMEB1 is a multifunctional nuclear/cytoplasmic protein whose SAND domain (containing the conserved KDWK motif and a zinc-binding motif) mediates sequence-specific DNA binding to the glucocorticoid modulatory element (GME); it forms a ~550 kDa heteromeric complex with GMEB2 to modulate glucocorticoid receptor transactivation (shifting the agonist dose-response curve and partial agonist activity of antagonists) by recruiting cofactors including CBP and Ubc9; in the cytoplasm, GMEB1 acts as an endogenous anti-apoptotic factor by binding to the prodomains of initiator procaspases (caspase-2, -8, -9), blocking their oligomerization and activation, and by acting as a bridge protein that recruits the deubiquitinase USP40 to stabilize CFLARL and inhibit DISC formation; GMEB1 is also targeted for MIB2-mediated ubiquitination and degradation, which suppresses GMEB1-dependent HSP27 phosphorylation; it interacts with HSP27, TRAF3, RAG1, and FOXL2 through distinct domains; and in midbrain dopamine neurons, Gmeb1 functions as a master transcriptional regulator of tyrosine hydroxylase (Th) and dopamine transporter (Dat) expression.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"GMEB1 is a dual-function regulator that operates both as a sequence-specific DNA-binding transcriptional modulator and as a cytoplasmic anti-apoptotic factor. It was first defined biochemically as a subunit of a ~550 kDa heteromeric complex with GMEB2 that binds the glucocorticoid modulatory element (GME) and reshapes glucocorticoid receptor transactivation—shifting the agonist dose-response curve and the partial agonist activity of antisteroids [#0, #3]. Sequence-specific DNA recognition is mediated by its SAND domain, whose 1.55 Å crystal structure positions the conserved KDWK motif on an exposed α-helix for DNA contact and contains a zinc-binding motif that sets the domain's C-terminal conformation without being required for binding [#9]. GMEB1 carries intrinsic transactivation activity through a domain separable from its GR-modulation domain, and it modulates GR not by directly altering GR–GRE binding but through parallel cofactor recruitment, engaging CBP and the SUMO-conjugating enzyme Ubc9 [#3, #6, #8]. As a transcription factor in its own right, GMEB1 controls midbrain dopamine neuron identity by driving tyrosine hydroxylase and dopamine transporter expression, with knockdown producing motor deficits [#18], and it directs context-specific gene programs through partners such as FOXL2 and promoters including YAP1 [#16, #21]. In the cytoplasm, GMEB1 is an endogenous inhibitor of initiator caspase activation: it binds the prodomains of procaspase-2, -8, and -9 to block their oligomerization-dependent activation, protecting cells against diverse stress stimuli and limiting ischemic brain injury in vivo [#10, #12, #13]. It additionally suppresses death-receptor signaling by bridging the deubiquitinase USP40 to CFLARL, stabilizing CFLARL and inhibiting DISC formation upon TRAIL stimulation [#17]. GMEB1 abundance and activity are tuned by ubiquitin-dependent turnover via the E3 ligase MIB2, which suppresses GMEB1-dependent HSP27 phosphorylation [#20].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established the existence and biochemical identity of GME-binding activity, defining GMEB1/GMEB2 as a novel heteromeric complex distinct from known CRE-binding factors that modulates glucocorticoid receptor behavior.\",\n      \"evidence\": \"Partial protein purification, gel shift, size exclusion chromatography and peptide sequencing from cell cytosol\",\n      \"pmids\": [\"7665613\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Component proteins not yet cloned\", \"Molecular mechanism of GR modulation undefined\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Cloning of GMEB2 and demonstration of cooperative GME binding with GMEB1 placed both proteins in a new KDWK-family and reconstituted the heteromeric DNA-binding complex.\",\n      \"evidence\": \"cDNA cloning, in vitro translation, gel shift with co-incubation\",\n      \"pmids\": [\"9651376\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of cooperativity unknown\", \"In vivo functional consequence not addressed\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Cloning of human GMEB1 and identification of HSP27 as a partner provided the human reagent and an early protein interaction beyond the GMEB2 complex.\",\n      \"evidence\": \"Yeast two-hybrid (HSP27 bait), cloning, EMSA/supershift, co-IP\",\n      \"pmids\": [\"10386584\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional role of HSP27 interaction not established\", \"Subcellular partitioning not resolved\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Defined how GMEB1 modulates GR transactivation—via intrinsic transactivation activity, direct GR and CBP interactions, and a dose-response shift—rather than altering GR-GRE occupancy.\",\n      \"evidence\": \"Mammalian one/two-hybrid, GST pull-down, reporter assays, HAT assays; positional GME reporter mutants\",\n      \"pmids\": [\"10894151\", \"10854715\", \"10692587\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cofactor recruitment mechanism not yet molecular\", \"Endogenous target genes beyond TAT reporter unknown\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Structure-function mapping separated GMEB1 activities into distinct domains and identified Ubc9 as a functional cofactor, providing a mechanistic basis for independent control of EC50 versus total GR-induced expression.\",\n      \"evidence\": \"Deletion mutagenesis with two-hybrid/DNA-binding/reporter readouts; co-IP and SUMO-transfer-dead Ubc9 mutants; in vitro MURF-1 binding\",\n      \"pmids\": [\"11934901\", \"11812797\", \"11927605\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional relevance of MURF-1 interaction untested\", \"How Ubc9 local concentration alters transcription not directly shown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"The SAND domain crystal structure resolved the DNA-recognition surface (KDWK motif) and a zinc-binding motif, establishing the atomic basis of sequence-specific DNA binding.\",\n      \"evidence\": \"X-ray crystallography (1.55 Å), NMR, site-directed mutagenesis, DNA binding assays\",\n      \"pmids\": [\"12702733\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of full-length complex on DNA absent\", \"Role of zinc conformation in vivo not defined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Extended GMEB1's anti-apoptotic role from procaspase-2 to procaspase-8 and -9 and demonstrated physiological protection in vivo, revealing a cytoplasmic function distinct from its transcriptional role.\",\n      \"evidence\": \"Co-IP, in vitro prodomain binding, caspase activation assays, siRNA, neurospecific transgenic mice with focal ischemia\",\n      \"pmids\": [\"15555560\", \"16497673\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants of cytoplasmic versus nuclear localization unknown\", \"Stoichiometry of caspase prodomain blockade unresolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Confirmed GMEB1 inhibits initiator caspase activation across hypoxic and oxidative stress, generalizing its cytoprotective mechanism.\",\n      \"evidence\": \"Caspase activation and viability assays under hypoxia and oxidative stress in neuroblastoma cells\",\n      \"pmids\": [\"18455874\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single cell-line context\", \"Upstream regulators of GMEB1 under stress not identified here\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Placed GMEB1 downstream of IL-12/PI3K/Akt signaling as the effector mediating anti-apoptotic protection against glucocorticoid-induced T-cell death.\",\n      \"evidence\": \"siRNA knockdown, apoptosis flow cytometry, qPCR, PI3K inhibition\",\n      \"pmids\": [\"21840619\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct biochemical link to PI3K/Akt not shown\", \"Whether transcriptional or caspase-binding function mediates the effect unclear\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified FOXL2 as a transcriptional partner and showed GMEB1 acts mainly as a repressor but enhances activity of an oncogenic FOXL2 variant, broadening its transcriptional partnerships.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP, immunofluorescence (aggregate sequestration), luciferase reporters\",\n      \"pmids\": [\"22544055\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Endogenous co-regulated genes not mapped\", \"Mechanism of promoter-specific switch from repression to activation unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined a death-receptor-specific anti-apoptotic mechanism (USP40-mediated CFLARL stabilization via GMEB1 bridging) and established GMEB1 as a master transcriptional regulator of dopaminergic neuron identity.\",\n      \"evidence\": \"Co-IP/pull-down, ubiquitination assays, shRNA, xenograft; nuclear capture RNA-seq/DNase-seq with in vivo AAV knockdown and behavioral readout\",\n      \"pmids\": [\"31046799\", \"31175277\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct DNA-binding sites at Th/Dat loci not structurally defined\", \"Cross-talk between transcriptional and DISC-inhibitory functions unexplored\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified TRAF3 as a partner that potentiates GMEB1's anti-apoptotic function, adding a regulatory input to caspase-inhibitory activity.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP with domain mapping, siRNA, apoptosis assays\",\n      \"pmids\": [\"32514408\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Domain on GMEB1 mediating TRAF3 binding not mapped\", \"Mechanism by which TRAF3 enhances protection unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Revealed ubiquitin-dependent control of GMEB1 levels through MIB2, linking GMEB1 turnover to suppression of HSP27 phosphorylation.\",\n      \"evidence\": \"RNA pull-down, co-IP, Western blot for stability/ubiquitination, gain/loss of function\",\n      \"pmids\": [\"34751796\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ubiquitination sites on GMEB1 not mapped\", \"How GMEB1 drives HSP27 phosphorylation mechanistically unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showed GMEB1 directly activates YAP1 transcription in hepatocellular carcinoma, extending its DNA-binding transcriptional role to a cancer-relevant target.\",\n      \"evidence\": \"ChIP-qPCR, dual-luciferase reporter, qRT-PCR, gain/loss of function\",\n      \"pmids\": [\"37389116\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Binding motif at YAP1 promoter not defined\", \"Whether GMEB2/cofactors participate not addressed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How GMEB1's nuclear transcriptional functions and cytoplasmic caspase/DISC-inhibitory functions are partitioned, coordinated, and switched within a cell remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No determinant of nucleo-cytoplasmic localization identified\", \"No unified model linking transcriptional and anti-apoptotic roles\", \"Genome-wide direct targets largely undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 2, 9, 21]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [3, 16, 18, 21]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 10, 12, 17]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 2, 18]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [10, 12, 17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [3, 18]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [10, 12, 17]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [3, 18, 21]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 17]}\n    ],\n    \"complexes\": [\"GMEB1-GMEB2 GME-binding complex\"],\n    \"partners\": [\"GMEB2\", \"NR3C1\", \"CREBBP\", \"UBE2I\", \"CASP8\", \"CFLAR\", \"USP40\", \"FOXL2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}