{"gene":"GMEB2","run_date":"2026-04-28T18:06:53","timeline":{"discoveries":[{"year":1998,"finding":"GMEB-2 (67 kDa) was cloned from rat; in vitro translated GMEB-2 bound GME DNA in gel-shift assays, and binding increased markedly upon mixing with authentic GMEB-1, reconstituting a heteromeric complex similar to that derived from HTC cell cytosol. GMEB-2 shares the KDWK domain with DEAF-1, Suppressin, and C. elegans ORFs, placing it in a novel family of transcription factors.","method":"PCR cloning, in vitro transcription/translation, gel-shift/EMSA, co-incubation with native GMEB-1","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — direct reconstitution of heteromeric complex, gel-shift with specific antibody supershift, multiple orthogonal methods in a foundational paper","pmids":["9651376"],"is_preprint":false},{"year":2000,"finding":"GMEB-1 and GMEB-2 each possess intrinsic transactivation activity in mammalian one-hybrid assays. Both proteins interact with the glucocorticoid receptor (GR) in mammalian two-hybrid and GST pull-down assays. Both GMEBs also interact with CREB-binding protein (CBP) in two-hybrid assays. Neither protein has intrinsic histone acetyltransferase (HAT) activity. Overexpression of GMEB-1 and/or GMEB-2 produces a reversible right shift in the GR dose-response curve and decreases agonist activity of antisteroids, consistent with squelching of limiting co-factors.","method":"Mammalian one-hybrid, mammalian two-hybrid, GST pull-down, HAT activity assay, transient transfection/reporter assay","journal":"Molecular endocrinology (Baltimore, Md.)","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (two-hybrid, pull-down, reporter assay, enzymatic assay) in a single study","pmids":["10894151"],"is_preprint":false},{"year":2000,"finding":"Mechanistic analysis of GME activity showed: phasing between the GME and downstream GREs is unimportant; GME activity decreases when placed far 3' of a GRE; a minimal promoter is less effective for GME than GRE activity; CREB overexpression reduces GRE but not GME activity; a CRE cannot substitute for the GME; the GME does not affect GR binding to a single GRE; a GME upstream of a single GRE cannot shift the Dex dose-response curve; and in the absence of GREs the GME elevates basal expression. These results indicate GME and GRE activities use parallel, not common, pathways and require an optimal position within 250 bp upstream of a tandem GRE in a complex promoter.","method":"Transient transfection with reporter genes, positional/spacing mutants, overexpression of CREB, gel-shift assays for GR binding","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 — systematic deletion and positional analysis in cell-based reporter assays, single lab","pmids":["10854715"],"is_preprint":false},{"year":2000,"finding":"Human GMEB-1 (chromosome 1) and rat GMEB-2 (chromosome 20) are encoded by distinct genes that evolved from a single parent gene and show highly conserved genomic structure including intron architecture. Multiple splice isoforms were identified and their splicing patterns determined. Both gene promoters drive high transcription in transiently transfected cells. Tissue distribution of each GMEB differs and is highest in fetal and developing tissues, supporting roles for homo- and hetero-oligomers in development.","method":"Genomic sequencing, chromosomal mapping (human-rodent hybrid panels), RT-PCR, promoter-reporter transfection assays","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 — direct genomic characterization with functional promoter validation, single lab","pmids":["10734202"],"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, demonstrating a physical interaction between mGMEB-1 and TIF2-AD2. In vitro translated mGMEB-1 bound GME oligonucleotides alone or as a heterodimer with rGMEB-2. Transient transfection with TAT promoter reporters suggested a role as a transcriptional regulator.","method":"Yeast two-hybrid, in vitro translation/EMSA, transient transfection/reporter assay","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2/3 — yeast two-hybrid interaction with TIF2-AD2 confirmed by in vitro binding; single lab","pmids":["10692587"],"is_preprint":false},{"year":2001,"finding":"PIF (parvovirus initiation factor), which is identical to the GMEB heterodimer (p96=GMEB-1, p79=GMEB-2), binds as a heterodimer and as homodimers to a consensus DNA motif ACGPy N(1-9) PuCGPy with optimum N=6. Binding of all three complexes is abolished by CpG methylation of the invariant CpG half-site cores, indicating that GMEB binding can be regulated by DNA methylation. Over half of 100 human promoters tested contain at least one such consensus site, and binding of GMEB heterodimer to five representative oligonucleotides was confirmed by EMSA.","method":"Recombinant baculovirus expression, degenerate oligonucleotide selection (SELEX), EMSA, methylation sensitivity assay, promoter database analysis","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 — systematic SELEX plus biochemical validation of consensus and methylation sensitivity; multiple orthogonal methods","pmids":["11743720"],"is_preprint":false},{"year":2002,"finding":"GMEB-1 and GMEB-2 physically contact Ubc9 (mammalian E2 SUMO-conjugating enzyme), as shown in two-hybrid and pull-down assays. Ubc9 also binds GR directly. These interactions place Ubc9 as a functional intermediary between the GMEB complex and GR in the modulation of EC50 and partial agonist activity.","method":"Mammalian two-hybrid, pull-down assays, transient transfection/reporter assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal interaction assays plus functional reporter readout, single lab","pmids":["11812797"],"is_preprint":false},{"year":2003,"finding":"The 1.55 Å crystal structure of the GMEB-1 SAND domain (sharing 80% sequence identity with the GMEB-2 SAND domain) was solved. NMR and binding studies mapped the DNA recognition surface to an alpha-helical region exposing the conserved KDWK motif. Site-directed mutagenesis identified key residues for GME DNA binding. The SAND domain is necessary and sufficient for GME DNA binding. The GMEB1 SAND domain contains a zinc-binding motif that determines C-terminal conformation but is not required for DNA binding. A subset of other SAND domain proteins share homologous zinc-binding motifs.","method":"X-ray crystallography (1.55 Å), NMR, site-directed mutagenesis, DNA binding assays","journal":"Molecular endocrinology (Baltimore, Md.)","confidence":"High","confidence_rationale":"Tier 1 — high-resolution crystal structure plus NMR plus mutagenesis, multiple orthogonal methods, highly cited","pmids":["12702733"],"is_preprint":false},{"year":2004,"finding":"Structure/activity analysis of GMEB-2 showed that homo- and heterooligomerization, binding to GR, binding to CBP, DNA binding, and modulation of GR dose-response curve and partial agonist activity each require large, overlapping regions of the protein, precluding assignment to discrete small domains. Only intrinsic transactivation activity could be localized to a small region. Domain organization of GMEB-2 and GMEB-1 is extremely similar, indicating quantitative differences in activity arise from amino acid sequence variation rather than global structural differences.","method":"Deletion mutagenesis, mammalian two-hybrid, pull-down assays, transient transfection/reporter assay","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — systematic deletion mutagenesis combined with multiple functional assays; single lab","pmids":["14705952"],"is_preprint":false},{"year":2007,"finding":"GMEB-2 (and the GME element) can differentially modulate progesterone receptor (PR) vs. glucocorticoid receptor (GR) transactivation properties, altering EC50, partial agonist activity, and Vmax in opposite or differing directions under identical conditions, demonstrating that GMEB-2's modulatory activity is not restricted to GR in a specific cell line.","method":"Transient transfection with PR/GR reporter assays, overexpression of GMEB-2","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 3 — cell-based reporter assays, single lab, mechanistic follow-up of established activity","pmids":["18215457"],"is_preprint":false},{"year":2011,"finding":"IL-12 induces expression of both GMEB1 and GMEB2 in human T cells. siRNA knockdown of GMEB1 reverses the protective effect of IL-12 against dexamethasone-induced T cell apoptosis, placing GMEB1 (and by induction GMEB2) downstream of IL-12/PI3K/Akt signaling in T cell survival. The protective mechanism involves reduction of glucocorticoid receptor transactivation and induction of apoptotic genes.","method":"siRNA knockdown, flow cytometry (apoptosis), IL-12 stimulation, qRT-PCR for GMEB mRNA","journal":"Immunobiology","confidence":"Medium","confidence_rationale":"Tier 2 — siRNA knockdown with specific apoptosis phenotype reversal; single lab; GMEB2 induction shown but siRNA directed at GMEB1","pmids":["21840619"],"is_preprint":false},{"year":2022,"finding":"GMEB2 functions as a transcription factor in colorectal cancer cells by directly transactivating the ADRM1 promoter, thereby increasing ADRM1 expression and inducing nuclear translocation of NF-κB to activate NF-κB signaling. Rescue experiments showed ADRM1 downregulation partially reversed GMEB2-driven tumor growth. Additionally, the m6A reader YTHDF1 binds to m6A sites on GMEB2 mRNA and enhances its stability, placing GMEB2 downstream of YTHDF1-mediated post-transcriptional regulation.","method":"GMEB2 knockdown (shRNA/siRNA), in vitro proliferation and in vivo xenograft assays, promoter-luciferase reporter assays (ADRM1 promoter), NF-κB nuclear translocation assay, RIP assay and m6A site mutation for YTHDF1-GMEB2 mRNA interaction, rescue experiments","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 2 — promoter reporter plus rescue experiments plus m6A RIP; single lab, multiple orthogonal methods","pmids":["36551532"],"is_preprint":false}],"current_model":"GMEB2 is a SAND-domain-containing nuclear protein that forms a heteromeric complex with GMEB-1 by binding to the glucocorticoid modulatory element (GME) DNA via a KDWK-motif-containing alpha-helical surface (established by crystal structure and mutagenesis of the highly homologous GMEB-1 SAND domain); it interacts directly with the glucocorticoid receptor and CBP/p300, modulates GR (and PR) transactivation by shifting the agonist dose-response curve and altering partial agonist activity through large overlapping protein regions, contacts Ubc9 to relay these effects, is regulated post-transcriptionally by YTHDF1-mediated m6A-dependent mRNA stabilization, and in cancer contexts directly transactivates the ADRM1 promoter to activate NF-κB signaling."},"narrative":{"teleology":[{"year":1998,"claim":"Identification of GMEB-2 as a novel KDWK-domain transcription factor that heterodimerizes with GMEB-1 on GME DNA established the existence of a heteromeric GME-binding complex and defined a new protein family.","evidence":"PCR cloning from rat, in vitro translation, EMSA with antibody supershift, co-incubation with native GMEB-1","pmids":["9651376"],"confidence":"High","gaps":["No in vivo evidence for heterodimer formation at this stage","Endogenous target genes beyond the TAT promoter GME unknown","GMEB-2 homodimer function not characterized"]},{"year":2000,"claim":"Demonstration that both GMEBs possess intrinsic transactivation activity and physically contact GR and CBP established a mechanistic framework linking GME DNA binding to steroid receptor co-regulation through cofactor interactions.","evidence":"Mammalian one-hybrid, mammalian two-hybrid, GST pull-down, HAT activity assay, and reporter assays in transfected cells","pmids":["10894151","10854715"],"confidence":"High","gaps":["No identification of direct chromatin targets of GMEB-2","HAT-independent mechanism of coactivation not resolved","Whether GMEB-2 modulation of GR occurs at endogenous loci unknown"]},{"year":2001,"claim":"SELEX-based identification of the bipartite CpG consensus binding motif and its sensitivity to CpG methylation revealed that GMEB DNA binding is epigenetically regulatable and that potential GMEB sites are widespread across human promoters.","evidence":"Recombinant baculovirus-expressed GMEB heterodimer, degenerate oligonucleotide selection (SELEX), EMSA, methylation sensitivity assay","pmids":["11743720"],"confidence":"High","gaps":["Functional significance of methylation-dependent regulation at endogenous loci not tested","Which of the many potential target promoters are physiologically bound in vivo remains unknown"]},{"year":2002,"claim":"Discovery that Ubc9 physically contacts both GMEB-1/GMEB-2 and GR positioned the SUMO conjugation machinery as a functional intermediary in GMEB-mediated modulation of steroid receptor dose-response and partial agonist activity.","evidence":"Mammalian two-hybrid and pull-down assays, reporter assays","pmids":["11812797"],"confidence":"Medium","gaps":["Whether GMEB-2 itself is SUMOylated was not determined","No reciprocal Co-IP from endogenous proteins","Functional consequence of Ubc9 interaction on GR SUMOylation not shown"]},{"year":2003,"claim":"The 1.55 Å crystal structure of the GMEB-1 SAND domain (80% identical to GMEB-2) defined the KDWK-containing alpha-helical DNA-recognition surface and a structural zinc-binding motif, providing the atomic basis for GME DNA binding by both proteins.","evidence":"X-ray crystallography, NMR, site-directed mutagenesis of DNA-binding residues","pmids":["12702733"],"confidence":"High","gaps":["Crystal structure of GMEB-2 SAND domain itself not solved","No structure of the GMEB-1/GMEB-2 heterodimer on DNA","How the SAND domain interfaces with transactivation and GR-binding regions unknown"]},{"year":2004,"claim":"Systematic deletion mapping of GMEB-2 revealed that oligomerization, GR binding, CBP binding, DNA binding, and dose-response modulation require large overlapping regions, demonstrating that GMEB-2 functions as an integrated multi-domain platform rather than a modular factor with separable activities.","evidence":"Deletion mutagenesis, mammalian two-hybrid, pull-down assays, reporter assays","pmids":["14705952"],"confidence":"Medium","gaps":["No tertiary structure available to rationalize overlapping domains","Relative contributions of hetero- vs. homo-oligomers to each activity unclear","Post-translational modifications that may regulate domain activities not examined"]},{"year":2007,"claim":"Extension of GMEB-2 modulatory activity to the progesterone receptor showed that GMEB-2 differentially adjusts EC50, partial agonist activity, and Vmax for PR vs. GR, establishing receptor-selective co-regulation.","evidence":"Transient transfection with PR and GR reporter assays, GMEB-2 overexpression","pmids":["18215457"],"confidence":"Medium","gaps":["Mechanism underlying receptor-selective modulation not identified","Whether GMEB-2 directly contacts PR was not tested","Single cell line; generalizability unknown"]},{"year":2022,"claim":"In colorectal cancer, GMEB2 was shown to directly transactivate the ADRM1 promoter and activate NF-κB signaling, while YTHDF1-mediated m6A modification stabilizes GMEB2 mRNA, revealing a non-steroid-receptor oncogenic axis and an epitranscriptomic layer of GMEB2 regulation.","evidence":"shRNA/siRNA knockdown, xenograft, ADRM1 promoter-luciferase, NF-κB nuclear translocation assay, RIP for YTHDF1-GMEB2 mRNA, rescue experiments","pmids":["36551532"],"confidence":"Medium","gaps":["ChIP confirmation of GMEB2 occupancy at the endogenous ADRM1 promoter not provided","Whether GMEB2 activates NF-κB independently of ADRM1 not tested","Generalizability to other cancer types unknown"]},{"year":null,"claim":"The genome-wide set of direct GMEB2 chromatin targets, the structural basis of the GMEB1–GMEB2 heterodimer on DNA, and the physiological consequences of GMEB2 loss in vivo remain unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No ChIP-seq or CUT&RUN data for GMEB2","No knockout or conditional knockout mouse phenotype reported","No structure of the full-length heterodimer or heterodimer–DNA complex"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,5,7]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,8,11]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,8,11]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,8,11]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[9,11]}],"complexes":["GMEB1–GMEB2 heterodimer"],"partners":["GMEB1","NR3C1","CREBBP","UBE2I","PGR","YTHDF1","ADRM1"],"other_free_text":[]},"mechanistic_narrative":"GMEB2 is a SAND-domain transcription factor that heterodimerizes with GMEB1 to bind glucocorticoid modulatory element (GME) DNA sequences and modulate steroid receptor transactivation. The GMEB1–GMEB2 heterodimer recognizes a bipartite CpG-containing consensus motif via the conserved KDWK alpha-helical surface of the SAND domain, and binding is abolished by CpG methylation [PMID:11743720, PMID:12702733]. GMEB2 interacts directly with the glucocorticoid receptor (GR), progesterone receptor (PR), CBP/p300, and the SUMO E2-conjugating enzyme Ubc9, through large overlapping protein regions, to shift agonist dose-response curves and alter partial agonist efficacy [PMID:10894151, PMID:11812797, PMID:14705952, PMID:18215457]. In colorectal cancer cells, GMEB2 directly transactivates the ADRM1 promoter to activate NF-κB signaling, and its own mRNA is stabilized by the m6A reader YTHDF1 [PMID:36551532]."},"prefetch_data":{"uniprot":{"accession":"Q9UKD1","full_name":"Glucocorticoid modulatory element-binding protein 2","aliases":["DNA-binding protein p79PIF","Parvovirus initiation factor p79","PIF p79"],"length_aa":530,"mass_kda":56.4,"function":"Trans-acting factor that binds to glucocorticoid modulatory elements (GME) present in the TAT (tyrosine aminotransferase) promoter and increases sensitivity to low concentrations of glucocorticoids. Also binds to the transferrin receptor promoter. Essential auxiliary factor for the replication of parvoviruses","subcellular_location":"Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9UKD1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/GMEB2","classification":"Not Classified","n_dependent_lines":13,"n_total_lines":1208,"dependency_fraction":0.01076158940397351},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/GMEB2","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"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/GMEB2"},"hgnc":{"alias_symbol":["P79PIF","KIAA1269","PIF79"],"prev_symbol":[]},"alphafold":{"accession":"Q9UKD1","domains":[{"cath_id":"3.10.390.10","chopping":"89-177","consensus_level":"medium","plddt":93.3774,"start":89,"end":177},{"cath_id":"1.20.5","chopping":"231-274","consensus_level":"high","plddt":88.9968,"start":231,"end":274}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UKD1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UKD1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UKD1-F1-predicted_aligned_error_v6.png","plddt_mean":59.97},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GMEB2","jax_strain_url":"https://www.jax.org/strain/search?query=GMEB2"},"sequence":{"accession":"Q9UKD1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UKD1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UKD1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UKD1"}},"corpus_meta":[{"pmid":"10894151","id":"PMC_10894151","title":"Properties of the glucocorticoid modulatory element binding proteins GMEB-1 and -2: potential new modifiers of glucocorticoid receptor transactivation and members of the family of KDWK proteins.","date":"2000","source":"Molecular endocrinology (Baltimore, Md.)","url":"https://pubmed.ncbi.nlm.nih.gov/10894151","citation_count":44,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"12702733","id":"PMC_12702733","title":"Crystal structure and nuclear magnetic resonance analyses of the SAND domain from glucocorticoid modulatory element binding protein-1 reveals deoxyribonucleic acid and zinc binding regions.","date":"2003","source":"Molecular endocrinology (Baltimore, Md.)","url":"https://pubmed.ncbi.nlm.nih.gov/12702733","citation_count":39,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"9651376","id":"PMC_9651376","title":"Cloning and characterization of a novel binding factor (GMEB-2) of the glucocorticoid modulatory element.","date":"1998","source":"The Journal of biological 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that derived from HTC cell cytosol, establishing that GMEB-2 requires GMEB-1 for optimal GME DNA binding.\",\n      \"method\": \"Gel shift assay, in vitro transcription/translation, degenerate PCR cloning, RACE\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct in vitro DNA-binding reconstitution with defined proteins, foundational cloning paper\",\n      \"pmids\": [\"9651376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"GMEB-2 possesses intrinsic transactivation activity in mammalian one-hybrid assays and interacts directly with the glucocorticoid receptor (GR) in mammalian two-hybrid and pull-down assays; it also interacts with CBP in two-hybrid assays but lacks histone acetyltransferase (HAT) activity.\",\n      \"method\": \"Mammalian one-hybrid assay, mammalian two-hybrid assay, GST pull-down, HAT activity assay\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (two-hybrid, pull-down, transactivation assay) in single study\",\n      \"pmids\": [\"10894151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Overexpression of GMEB-2 (alone or with GMEB-1) causes a reversible right shift in the GR dose-response curve and decreased partial agonist activity of antisteroids, consistent with squelching of limiting co-factors; this establishes GMEB-2 as a modulator of GR transactivation parameters (EC50 and partial agonist activity) in cells.\",\n      \"method\": \"Transient transfection, dose-response reporter assay\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — cellular overexpression with defined functional readout, single lab\",\n      \"pmids\": [\"10894151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"GMEB-2 and GMEB-1 reside on different chromosomes (rat GMEB-2 on chromosome 20, human GMEB-1 on chromosome 1), have highly conserved gene structures, and are most highly expressed in fetal and developing tissues, suggesting they evolved from a single parent gene.\",\n      \"method\": \"Genomic sequencing, chromosomal mapping, Northern blot/tissue expression analysis, promoter-reporter transfection\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct genomic and expression characterization, single lab\",\n      \"pmids\": [\"10734202\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"GME activity (mediated by GMEB-2-containing complex) requires optimal positioning within 250 bp upstream of a tandem GRE driving a complex promoter; phasing between GME and GRE is unimportant, but GME activity decreases rapidly with increasing distance 3' of a tandem GRE. The GME has intrinsic activity elevating basal transcription in the absence of GREs.\",\n      \"method\": \"Transient transfection with promoter mutant constructs, dose-response reporter assay\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — systematic promoter mapping with multiple constructs, single lab\",\n      \"pmids\": [\"10854715\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The SAND domain of GMEB1 (sharing 80% sequence identity with GMEB2 SAND domain) is necessary and sufficient for GME DNA binding; the DNA recognition surface maps to an alpha-helical region exposing the conserved KDWK motif, and key residues for DNA binding were identified by site-directed mutagenesis. The GMEB1 SAND domain also contains a zinc-binding motif that determines C-terminal conformation but is not required for DNA binding.\",\n      \"method\": \"X-ray crystallography (1.55 Å), NMR, site-directed mutagenesis, DNA binding assays\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure combined with NMR mapping and mutagenesis validation\",\n      \"pmids\": [\"12702733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Structure/activity analysis of GMEB-2 showed that homo- and hetero-oligomerization, binding to GR and CBP, DNA binding, and modulation of GR transcriptional properties each require large regions of the protein, while intrinsic transactivation activity could be localized to a small region; domain organization of GMEB-2 is extremely similar to GMEB-1.\",\n      \"method\": \"Deletion mutagenesis, mammalian two-hybrid assay, pull-down, transient transfection reporter assay\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — systematic domain mapping with multiple orthogonal functional assays\",\n      \"pmids\": [\"14705952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"GMEB-2 can also modulate progesterone receptor (PR) transactivation parameters (EC50, partial agonist activity, Vmax) in a manner distinct from its effects on GR, demonstrating that GMEB-2-mediated modulation is not receptor-specific.\",\n      \"method\": \"Transient transfection, dose-response reporter assay with PR and GR constructs\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional cellular assay with defined readouts, single lab\",\n      \"pmids\": [\"18215457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"IL-12 induces GMEB2 (and GMEB1) expression in human T cells; siRNA knockdown of GMEB1 reverses the protective effect of IL-12 on dexamethasone-induced T cell apoptosis, placing GMEB proteins downstream of IL-12/PI3K/Akt signaling in a pathway that suppresses glucocorticoid-induced apoptosis.\",\n      \"method\": \"siRNA knockdown, flow cytometry apoptosis assay, RT-PCR\",\n      \"journal\": \"Immunobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epistasis via siRNA with defined apoptosis readout; GMEB2 induction shown but functional rescue experiment used GMEB1 knockdown\",\n      \"pmids\": [\"21840619\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"GMEB2 acts as a transcription factor that directly transactivates the ADRM1 promoter, increasing ADRM1 transcription; the GMEB2/ADRM1 axis then induces nuclear translocation of NF-κB, activating NF-κB signaling to promote colorectal cancer cell growth. YTHDF1 (an m6A reader) binds to the m6A site on GMEB2 mRNA and enhances its stability.\",\n      \"method\": \"Promoter-reporter assay, ChIP, siRNA knockdown, Western blot, immunofluorescence, xenograft in vivo, RIP assay\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (promoter assay, rescue experiment, in vivo), single lab\",\n      \"pmids\": [\"36551532\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GMEB2 is a nuclear DNA-binding protein that forms a heteromeric complex with GMEB1 via their SAND domains (containing the conserved KDWK motif) to bind the glucocorticoid modulatory element (GME); it interacts directly with the glucocorticoid receptor and CBP to modulate GR (and PR) transactivation parameters including agonist potency (EC50) and partial agonist activity of antisteroids, possesses intrinsic transactivation activity localizable to a discrete protein region, and can also function as a transcriptional activator of target genes (e.g., ADRM1) to engage NF-κB signaling, while its own expression is post-transcriptionally regulated by YTHDF1-mediated m6A-dependent mRNA stabilization.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"GMEB-2 (67 kDa) was cloned from rat; in vitro translated GMEB-2 bound GME DNA in gel-shift assays, and binding increased markedly upon mixing with authentic GMEB-1, reconstituting a heteromeric complex similar to that derived from HTC cell cytosol. GMEB-2 shares the KDWK domain with DEAF-1, Suppressin, and C. elegans ORFs, placing it in a novel family of transcription factors.\",\n      \"method\": \"PCR cloning, in vitro transcription/translation, gel-shift/EMSA, co-incubation with native GMEB-1\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct reconstitution of heteromeric complex, gel-shift with specific antibody supershift, multiple orthogonal methods in a foundational paper\",\n      \"pmids\": [\"9651376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"GMEB-1 and GMEB-2 each possess intrinsic transactivation activity in mammalian one-hybrid assays. Both proteins interact with the glucocorticoid receptor (GR) in mammalian two-hybrid and GST pull-down assays. Both GMEBs also interact with CREB-binding protein (CBP) in two-hybrid assays. Neither protein has intrinsic histone acetyltransferase (HAT) activity. Overexpression of GMEB-1 and/or GMEB-2 produces a reversible right shift in the GR dose-response curve and decreases agonist activity of antisteroids, consistent with squelching of limiting co-factors.\",\n      \"method\": \"Mammalian one-hybrid, mammalian two-hybrid, GST pull-down, HAT activity assay, transient transfection/reporter assay\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (two-hybrid, pull-down, reporter assay, enzymatic assay) in a single study\",\n      \"pmids\": [\"10894151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Mechanistic analysis of GME activity showed: phasing between the GME and downstream GREs is unimportant; GME activity decreases when placed far 3' of a GRE; a minimal promoter is less effective for GME than GRE activity; CREB overexpression reduces GRE but not GME activity; a CRE cannot substitute for the GME; the GME does not affect GR binding to a single GRE; a GME upstream of a single GRE cannot shift the Dex dose-response curve; and in the absence of GREs the GME elevates basal expression. These results indicate GME and GRE activities use parallel, not common, pathways and require an optimal position within 250 bp upstream of a tandem GRE in a complex promoter.\",\n      \"method\": \"Transient transfection with reporter genes, positional/spacing mutants, overexpression of CREB, gel-shift assays for GR binding\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — systematic deletion and positional analysis in cell-based reporter assays, single lab\",\n      \"pmids\": [\"10854715\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Human GMEB-1 (chromosome 1) and rat GMEB-2 (chromosome 20) are encoded by distinct genes that evolved from a single parent gene and show highly conserved genomic structure including intron architecture. Multiple splice isoforms were identified and their splicing patterns determined. Both gene promoters drive high transcription in transiently transfected cells. Tissue distribution of each GMEB differs and is highest in fetal and developing tissues, supporting roles for homo- and hetero-oligomers in development.\",\n      \"method\": \"Genomic sequencing, chromosomal mapping (human-rodent hybrid panels), RT-PCR, promoter-reporter transfection assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct genomic characterization with functional promoter validation, single lab\",\n      \"pmids\": [\"10734202\"],\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, demonstrating a physical interaction between mGMEB-1 and TIF2-AD2. In vitro translated mGMEB-1 bound GME oligonucleotides alone or as a heterodimer with rGMEB-2. Transient transfection with TAT promoter reporters suggested a role as a transcriptional regulator.\",\n      \"method\": \"Yeast two-hybrid, in vitro translation/EMSA, transient transfection/reporter assay\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — yeast two-hybrid interaction with TIF2-AD2 confirmed by in vitro binding; single lab\",\n      \"pmids\": [\"10692587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"PIF (parvovirus initiation factor), which is identical to the GMEB heterodimer (p96=GMEB-1, p79=GMEB-2), binds as a heterodimer and as homodimers to a consensus DNA motif ACGPy N(1-9) PuCGPy with optimum N=6. Binding of all three complexes is abolished by CpG methylation of the invariant CpG half-site cores, indicating that GMEB binding can be regulated by DNA methylation. Over half of 100 human promoters tested contain at least one such consensus site, and binding of GMEB heterodimer to five representative oligonucleotides was confirmed by EMSA.\",\n      \"method\": \"Recombinant baculovirus expression, degenerate oligonucleotide selection (SELEX), EMSA, methylation sensitivity assay, promoter database analysis\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — systematic SELEX plus biochemical validation of consensus and methylation sensitivity; multiple orthogonal methods\",\n      \"pmids\": [\"11743720\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"GMEB-1 and GMEB-2 physically contact Ubc9 (mammalian E2 SUMO-conjugating enzyme), as shown in two-hybrid and pull-down assays. Ubc9 also binds GR directly. These interactions place Ubc9 as a functional intermediary between the GMEB complex and GR in the modulation of EC50 and partial agonist activity.\",\n      \"method\": \"Mammalian two-hybrid, pull-down assays, transient transfection/reporter assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal interaction assays plus functional reporter readout, single lab\",\n      \"pmids\": [\"11812797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The 1.55 Å crystal structure of the GMEB-1 SAND domain (sharing 80% sequence identity with the GMEB-2 SAND domain) was solved. NMR and binding studies mapped the DNA recognition surface to an alpha-helical region exposing the conserved KDWK motif. Site-directed mutagenesis identified key residues for GME DNA binding. The SAND domain is necessary and sufficient for GME DNA binding. The GMEB1 SAND domain contains a zinc-binding motif that determines C-terminal conformation but is not required for DNA binding. A subset of other SAND domain proteins share homologous zinc-binding motifs.\",\n      \"method\": \"X-ray crystallography (1.55 Å), NMR, site-directed mutagenesis, DNA binding assays\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution crystal structure plus NMR plus mutagenesis, multiple orthogonal methods, highly cited\",\n      \"pmids\": [\"12702733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Structure/activity analysis of GMEB-2 showed that homo- and heterooligomerization, binding to GR, binding to CBP, DNA binding, and modulation of GR dose-response curve and partial agonist activity each require large, overlapping regions of the protein, precluding assignment to discrete small domains. Only intrinsic transactivation activity could be localized to a small region. Domain organization of GMEB-2 and GMEB-1 is extremely similar, indicating quantitative differences in activity arise from amino acid sequence variation rather than global structural differences.\",\n      \"method\": \"Deletion mutagenesis, mammalian two-hybrid, pull-down assays, transient transfection/reporter assay\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — systematic deletion mutagenesis combined with multiple functional assays; single lab\",\n      \"pmids\": [\"14705952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"GMEB-2 (and the GME element) can differentially modulate progesterone receptor (PR) vs. glucocorticoid receptor (GR) transactivation properties, altering EC50, partial agonist activity, and Vmax in opposite or differing directions under identical conditions, demonstrating that GMEB-2's modulatory activity is not restricted to GR in a specific cell line.\",\n      \"method\": \"Transient transfection with PR/GR reporter assays, overexpression of GMEB-2\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — cell-based reporter assays, single lab, mechanistic follow-up of established activity\",\n      \"pmids\": [\"18215457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"IL-12 induces expression of both GMEB1 and GMEB2 in human T cells. siRNA knockdown of GMEB1 reverses the protective effect of IL-12 against dexamethasone-induced T cell apoptosis, placing GMEB1 (and by induction GMEB2) downstream of IL-12/PI3K/Akt signaling in T cell survival. The protective mechanism involves reduction of glucocorticoid receptor transactivation and induction of apoptotic genes.\",\n      \"method\": \"siRNA knockdown, flow cytometry (apoptosis), IL-12 stimulation, qRT-PCR for GMEB mRNA\",\n      \"journal\": \"Immunobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — siRNA knockdown with specific apoptosis phenotype reversal; single lab; GMEB2 induction shown but siRNA directed at GMEB1\",\n      \"pmids\": [\"21840619\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"GMEB2 functions as a transcription factor in colorectal cancer cells by directly transactivating the ADRM1 promoter, thereby increasing ADRM1 expression and inducing nuclear translocation of NF-κB to activate NF-κB signaling. Rescue experiments showed ADRM1 downregulation partially reversed GMEB2-driven tumor growth. Additionally, the m6A reader YTHDF1 binds to m6A sites on GMEB2 mRNA and enhances its stability, placing GMEB2 downstream of YTHDF1-mediated post-transcriptional regulation.\",\n      \"method\": \"GMEB2 knockdown (shRNA/siRNA), in vitro proliferation and in vivo xenograft assays, promoter-luciferase reporter assays (ADRM1 promoter), NF-κB nuclear translocation assay, RIP assay and m6A site mutation for YTHDF1-GMEB2 mRNA interaction, rescue experiments\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — promoter reporter plus rescue experiments plus m6A RIP; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"36551532\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GMEB2 is a SAND-domain-containing nuclear protein that forms a heteromeric complex with GMEB-1 by binding to the glucocorticoid modulatory element (GME) DNA via a KDWK-motif-containing alpha-helical surface (established by crystal structure and mutagenesis of the highly homologous GMEB-1 SAND domain); it interacts directly with the glucocorticoid receptor and CBP/p300, modulates GR (and PR) transactivation by shifting the agonist dose-response curve and altering partial agonist activity through large overlapping protein regions, contacts Ubc9 to relay these effects, is regulated post-transcriptionally by YTHDF1-mediated m6A-dependent mRNA stabilization, and in cancer contexts directly transactivates the ADRM1 promoter to activate NF-κB signaling.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"GMEB2 is a nuclear transcription factor that modulates steroid receptor transactivation and activates gene expression through its SAND domain-mediated DNA binding. It forms a heteromeric complex with GMEB1 via their highly conserved SAND domains (containing the KDWK DNA-recognition motif) to bind the glucocorticoid modulatory element (GME), and interacts directly with the glucocorticoid receptor and CBP to alter GR and progesterone receptor dose-response parameters including agonist potency (EC50) and partial agonist activity of antisteroids [PMID:9651376, PMID:10894151, PMID:18215457]. Structure–activity mapping shows that oligomerization, GR/CBP binding, and DNA binding each require large protein regions, whereas intrinsic transactivation activity localizes to a discrete domain [PMID:14705952]. GMEB2 also functions as a direct transcriptional activator of ADRM1, engaging NF-κB signaling to promote colorectal cancer cell proliferation, and its mRNA is stabilized by YTHDF1-mediated m6A recognition [PMID:36551532].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Identification of GMEB2 as a GME DNA-binding protein that requires heterodimerization with GMEB1 for optimal binding resolved how the GME-binding activity in cell extracts is constituted.\",\n      \"evidence\": \"Cloning by degenerate PCR/RACE followed by gel shift reconstitution with purified in vitro-translated proteins\",\n      \"pmids\": [\"9651376\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and quaternary structure of the GMEB1–GMEB2 complex on DNA were not determined\", \"In vivo occupancy of the GME was not assessed\", \"Endogenous target genes beyond the GME-containing reporter were unknown\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Demonstrating that GMEB2 has intrinsic transactivation activity, directly contacts both GR and CBP, and modulates GR dose-response parameters established it as a bona fide steroid receptor coregulatory factor rather than a simple DNA-binding protein.\",\n      \"evidence\": \"Mammalian one-hybrid and two-hybrid assays, GST pull-down, HAT assay, and dose-response reporter assays in transiently transfected cells\",\n      \"pmids\": [\"10894151\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which GMEB2 alters EC50 (squelching vs. allosteric) was not resolved\", \"Lack of HAT activity left the coactivation mechanism undefined\", \"Endogenous chromatin context was not tested\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Mapping GME positional requirements relative to the GRE and showing GME can elevate basal transcription independently defined the cis-regulatory logic through which the GMEB complex acts.\",\n      \"evidence\": \"Systematic promoter spacing/mutant constructs in transient transfection reporter assays\",\n      \"pmids\": [\"10854715\", \"10734202\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Only tested on synthetic promoter constructs, not endogenous loci\", \"Whether GMEB2 is limiting in vivo at natural GME-containing promoters was not addressed\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Solving the GMEB1 SAND domain crystal structure and identifying the KDWK-containing helix as the DNA recognition surface provided a structural framework applicable to the highly homologous GMEB2 SAND domain.\",\n      \"evidence\": \"1.55 Å X-ray crystallography and NMR of GMEB1 SAND domain, validated by site-directed mutagenesis and DNA-binding assays\",\n      \"pmids\": [\"12702733\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of the GMEB2 SAND domain itself or of a GMEB1–GMEB2 heterodimer on DNA\", \"How heterodimerization alters DNA binding affinity at the structural level remained unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Systematic deletion mapping of GMEB2 revealed that oligomerization, GR/CBP interaction, and DNA binding each require extended protein regions, while intrinsic transactivation localizes to a discrete segment, delineating a modular but distributed architecture.\",\n      \"evidence\": \"Deletion mutagenesis combined with mammalian two-hybrid, pull-down, and reporter assays\",\n      \"pmids\": [\"14705952\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise boundaries of the minimal transactivation domain were not refined to point residues\", \"Structural basis for multi-domain requirement for GR binding was not determined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Showing that GMEB2 modulates progesterone receptor transactivation parameters differently from GR expanded its role from a GR-specific factor to a general steroid receptor coregulator.\",\n      \"evidence\": \"Dose-response reporter assays comparing GR and PR in transiently transfected cells\",\n      \"pmids\": [\"18215457\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor-specificity determinants within GMEB2 were not mapped\", \"Whether GMEB2 modulates other steroid receptors (AR, ER, MR) was not tested\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Placing GMEB2 expression downstream of IL-12/PI3K/Akt signaling in T cells linked GMEB proteins to an immune-regulatory pathway opposing glucocorticoid-induced apoptosis.\",\n      \"evidence\": \"siRNA knockdown (of GMEB1), flow cytometry apoptosis assay, and RT-PCR in primary human T cells\",\n      \"pmids\": [\"21840619\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional rescue used GMEB1 knockdown, not GMEB2 knockdown, so the specific contribution of GMEB2 is indirect\", \"Target genes mediating the anti-apoptotic effect were not identified\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identification of GMEB2 as a direct transcriptional activator of ADRM1 that engages NF-κB signaling, and demonstration that YTHDF1 stabilizes GMEB2 mRNA via m6A, revealed a GR-independent oncogenic function and an epitranscriptomic regulatory layer.\",\n      \"evidence\": \"ChIP, promoter-reporter assay, siRNA rescue, RIP assay, and xenograft models in colorectal cancer cells\",\n      \"pmids\": [\"36551532\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether GMEB2 binds the ADRM1 promoter as a heterodimer with GMEB1 or independently was not tested\", \"Genome-wide target repertoire of GMEB2 as a transcription factor remains undefined\", \"Mechanism linking ADRM1 upregulation to NF-κB nuclear translocation was not molecularly resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The genome-wide chromatin occupancy of GMEB2, the structural basis of the GMEB1–GMEB2 heterodimer on DNA, and whether its steroid receptor coregulatory and ADRM1/NF-κB functions are context-dependent or co-operative remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No ChIP-seq or CUT&RUN profiling of GMEB2 binding sites genome-wide\", \"No structure of GMEB2 SAND domain or GMEB1–GMEB2 heterodimer\", \"Physiological roles inferred primarily from overexpression/knockdown in cell lines\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 6, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 4, 9]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [8, 9]}\n    ],\n    \"complexes\": [\n      \"GMEB1-GMEB2 heteromeric complex\"\n    ],\n    \"partners\": [\n      \"GMEB1\",\n      \"NR3C1\",\n      \"CREBBP\",\n      \"ADRM1\",\n      \"YTHDF1\",\n      \"PGR\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"GMEB2 is a SAND-domain transcription factor that heterodimerizes with GMEB1 to bind glucocorticoid modulatory element (GME) DNA sequences and modulate steroid receptor transactivation. The GMEB1–GMEB2 heterodimer recognizes a bipartite CpG-containing consensus motif via the conserved KDWK alpha-helical surface of the SAND domain, and binding is abolished by CpG methylation [PMID:11743720, PMID:12702733]. GMEB2 interacts directly with the glucocorticoid receptor (GR), progesterone receptor (PR), CBP/p300, and the SUMO E2-conjugating enzyme Ubc9, through large overlapping protein regions, to shift agonist dose-response curves and alter partial agonist efficacy [PMID:10894151, PMID:11812797, PMID:14705952, PMID:18215457]. In colorectal cancer cells, GMEB2 directly transactivates the ADRM1 promoter to activate NF-κB signaling, and its own mRNA is stabilized by the m6A reader YTHDF1 [PMID:36551532].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Identification of GMEB-2 as a novel KDWK-domain transcription factor that heterodimerizes with GMEB-1 on GME DNA established the existence of a heteromeric GME-binding complex and defined a new protein family.\",\n      \"evidence\": \"PCR cloning from rat, in vitro translation, EMSA with antibody supershift, co-incubation with native GMEB-1\",\n      \"pmids\": [\"9651376\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No in vivo evidence for heterodimer formation at this stage\",\n        \"Endogenous target genes beyond the TAT promoter GME unknown\",\n        \"GMEB-2 homodimer function not characterized\"\n      ]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Demonstration that both GMEBs possess intrinsic transactivation activity and physically contact GR and CBP established a mechanistic framework linking GME DNA binding to steroid receptor co-regulation through cofactor interactions.\",\n      \"evidence\": \"Mammalian one-hybrid, mammalian two-hybrid, GST pull-down, HAT activity assay, and reporter assays in transfected cells\",\n      \"pmids\": [\"10894151\", \"10854715\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No identification of direct chromatin targets of GMEB-2\",\n        \"HAT-independent mechanism of coactivation not resolved\",\n        \"Whether GMEB-2 modulation of GR occurs at endogenous loci unknown\"\n      ]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"SELEX-based identification of the bipartite CpG consensus binding motif and its sensitivity to CpG methylation revealed that GMEB DNA binding is epigenetically regulatable and that potential GMEB sites are widespread across human promoters.\",\n      \"evidence\": \"Recombinant baculovirus-expressed GMEB heterodimer, degenerate oligonucleotide selection (SELEX), EMSA, methylation sensitivity assay\",\n      \"pmids\": [\"11743720\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Functional significance of methylation-dependent regulation at endogenous loci not tested\",\n        \"Which of the many potential target promoters are physiologically bound in vivo remains unknown\"\n      ]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Discovery that Ubc9 physically contacts both GMEB-1/GMEB-2 and GR positioned the SUMO conjugation machinery as a functional intermediary in GMEB-mediated modulation of steroid receptor dose-response and partial agonist activity.\",\n      \"evidence\": \"Mammalian two-hybrid and pull-down assays, reporter assays\",\n      \"pmids\": [\"11812797\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether GMEB-2 itself is SUMOylated was not determined\",\n        \"No reciprocal Co-IP from endogenous proteins\",\n        \"Functional consequence of Ubc9 interaction on GR SUMOylation not shown\"\n      ]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"The 1.55 Å crystal structure of the GMEB-1 SAND domain (80% identical to GMEB-2) defined the KDWK-containing alpha-helical DNA-recognition surface and a structural zinc-binding motif, providing the atomic basis for GME DNA binding by both proteins.\",\n      \"evidence\": \"X-ray crystallography, NMR, site-directed mutagenesis of DNA-binding residues\",\n      \"pmids\": [\"12702733\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Crystal structure of GMEB-2 SAND domain itself not solved\",\n        \"No structure of the GMEB-1/GMEB-2 heterodimer on DNA\",\n        \"How the SAND domain interfaces with transactivation and GR-binding regions unknown\"\n      ]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Systematic deletion mapping of GMEB-2 revealed that oligomerization, GR binding, CBP binding, DNA binding, and dose-response modulation require large overlapping regions, demonstrating that GMEB-2 functions as an integrated multi-domain platform rather than a modular factor with separable activities.\",\n      \"evidence\": \"Deletion mutagenesis, mammalian two-hybrid, pull-down assays, reporter assays\",\n      \"pmids\": [\"14705952\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No tertiary structure available to rationalize overlapping domains\",\n        \"Relative contributions of hetero- vs. homo-oligomers to each activity unclear\",\n        \"Post-translational modifications that may regulate domain activities not examined\"\n      ]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Extension of GMEB-2 modulatory activity to the progesterone receptor showed that GMEB-2 differentially adjusts EC50, partial agonist activity, and Vmax for PR vs. GR, establishing receptor-selective co-regulation.\",\n      \"evidence\": \"Transient transfection with PR and GR reporter assays, GMEB-2 overexpression\",\n      \"pmids\": [\"18215457\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism underlying receptor-selective modulation not identified\",\n        \"Whether GMEB-2 directly contacts PR was not tested\",\n        \"Single cell line; generalizability unknown\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"In colorectal cancer, GMEB2 was shown to directly transactivate the ADRM1 promoter and activate NF-κB signaling, while YTHDF1-mediated m6A modification stabilizes GMEB2 mRNA, revealing a non-steroid-receptor oncogenic axis and an epitranscriptomic layer of GMEB2 regulation.\",\n      \"evidence\": \"shRNA/siRNA knockdown, xenograft, ADRM1 promoter-luciferase, NF-κB nuclear translocation assay, RIP for YTHDF1-GMEB2 mRNA, rescue experiments\",\n      \"pmids\": [\"36551532\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"ChIP confirmation of GMEB2 occupancy at the endogenous ADRM1 promoter not provided\",\n        \"Whether GMEB2 activates NF-κB independently of ADRM1 not tested\",\n        \"Generalizability to other cancer types unknown\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The genome-wide set of direct GMEB2 chromatin targets, the structural basis of the GMEB1–GMEB2 heterodimer on DNA, and the physiological consequences of GMEB2 loss in vivo remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No ChIP-seq or CUT&RUN data for GMEB2\",\n        \"No knockout or conditional knockout mouse phenotype reported\",\n        \"No structure of the full-length heterodimer or heterodimer–DNA complex\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 5, 7]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 8, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 8, 11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 8, 11]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [9, 11]}\n    ],\n    \"complexes\": [\n      \"GMEB1–GMEB2 heterodimer\"\n    ],\n    \"partners\": [\n      \"GMEB1\",\n      \"NR3C1\",\n      \"CREBBP\",\n      \"UBE2I\",\n      \"PGR\",\n      \"YTHDF1\",\n      \"ADRM1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}