{"gene":"GPS2","run_date":"2026-06-10T01:55:21","timeline":{"discoveries":[{"year":2002,"finding":"GPS2 is an integral subunit of the N-CoR-HDAC3 nuclear receptor corepressor complex. GPS2 and TBL1 interact cooperatively with repression domain 1 of N-CoR to form a heterotrimeric structure and are indirectly linked to HDAC3 via an extended N-CoR SANT domain that also activates latent HDAC3 activity. The N-CoR-HDAC3 complex inhibits JNK activation through its associated GPS2 subunit.","method":"Co-immunoprecipitation, biochemical reconstitution, functional reporter assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — reconstitution of stable complex, structural motif mapping, functional JNK inhibition assay, foundational study replicated by many subsequent works","pmids":["11931768"],"is_preprint":false},{"year":2000,"finding":"GPS2 (AMF-1) binds the transcriptional coactivator p300 both in vitro and in vivo, and recruits p300 into a complex with papillomavirus E2 protein, facilitating histone acetylase activity recruitment and E2-dependent transcriptional activation.","method":"In vitro binding assay, co-immunoprecipitation, co-transfection reporter assay, histone acetyltransferase immunoprecipitation","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, in vitro binding, functional reporter assay, single lab with multiple orthogonal methods","pmids":["10846067"],"is_preprint":false},{"year":2001,"finding":"GPS2 (AMF-1) associates with p53 both in vivo and in vitro and facilitates p53-dependent transcription. Overexpression of GPS2 in U2OS cells increases basal p21(WAF1/CIP1) expression, causes G1 arrest, and increases apoptosis upon UV irradiation.","method":"Co-immunoprecipitation, in vitro binding, reporter assay, flow cytometry, cell viability assay","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus in vitro binding, functional cellular assays, single lab","pmids":["11486030"],"is_preprint":false},{"year":2001,"finding":"GPS2 interacts with HPV E6 proteins from both high- and low-risk HPV types. High-risk E6 induces degradation of GPS2 in vivo (but not in vitro) and suppresses GPS2 transcriptional activation activity.","method":"Yeast two-hybrid, co-transfection, pulse-chase analysis, transcriptional reporter assay","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — yeast two-hybrid validated by cellular degradation assays and functional transcription assays, single lab","pmids":["11119584"],"is_preprint":false},{"year":2005,"finding":"GPS2 interacts specifically with the hMSH4-hMSH5 heterocomplex (not with hMSH4 or hMSH5 alone), mediated through the interface of the hMSH4-hMSH5 complex and the N-terminal region of GPS2, suggesting GPS2-associated deacetylase complex functions with hMSH4-hMSH5 in homologous recombination.","method":"Co-immunoprecipitation in human cells, interaction mapping with deletion mutants, yeast two-hybrid","journal":"DNA repair","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP with domain mapping, interaction validated in human cells, single lab","pmids":["16122992"],"is_preprint":false},{"year":2007,"finding":"GPS2 directly interacts with SHP, LRH-1, HNF4alpha, and FXR, acting as a differential coregulator of CYP7A1 and CYP8B1 expression in bile acid biosynthesis pathways, with GPS2 being a stoichiometric subunit of a conserved corepressor complex.","method":"Co-immunoprecipitation, ChIP, reporter assay, RNAi knockdown","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple binding partners validated by Co-IP and ChIP, functional gene regulation confirmed by RNAi, single lab","pmids":["17895379"],"is_preprint":false},{"year":2008,"finding":"GPS2 interacts with the brain-specific transcription factor RFX4_v3, co-localizes with it in the nucleus, is recruited by RFX4_v3 to the Cx3cl1 promoter, and potentiates RFX4_v3-dependent transactivation through X-box 1. GPS2 binds both the C-terminal (amino acids 575-735) and middle (amino acids 250-574) regions of RFX4_v3.","method":"Yeast two-hybrid, co-immunoprecipitation, indirect immunofluorescence, ChIP, reporter assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (Y2H, Co-IP, ChIP, reporter), single lab","pmids":["18218630"],"is_preprint":false},{"year":2009,"finding":"GPS2 is required for ABCG1 cholesterol transporter gene transcription and cholesterol efflux from macrophages. GPS2 facilitates LXR recruitment to an ABCG1-specific promoter/enhancer unit upon ligand activation and is functionally linked to histone H3K9 demethylation at this locus.","method":"RNAi knockdown, ChIP, cholesterol efflux assay, reporter assay, histone methylation analysis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (RNAi, ChIP, efflux assay, epigenetic analysis), replicated in subsequent studies","pmids":["19481530"],"is_preprint":false},{"year":2009,"finding":"GPS2 is a stable component of SMRT corepressor complexes with the repression domain mapped to the N-terminal SMRT-interacting domain. GPS2 knockdown abrogates SMRT-mediated repression; GPS2 depletion also enhanced estradiol-induced ERα target gene expression and promoted MCF-7 cell proliferation.","method":"Co-immunoprecipitation, RNAi knockdown, ChIP, reporter assay, cell proliferation assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, domain mapping, ChIP and functional assays, single lab","pmids":["19858209"],"is_preprint":false},{"year":2010,"finding":"GPS2 functions as a transrepression mediator connecting SUMOylated nuclear receptors (LRH-1 and LXRbeta) to the N-CoR corepressor complex at hepatic acute phase response promoters, preventing clearance of the corepressor complex upon cytokine stimulation.","method":"ChIP, Co-immunoprecipitation, reporter assay, LXR knockout mice, SUMO-1 knockout mice","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods including knockout mouse models, ChIP, and Co-IP; replicated in subsequent works","pmids":["20159957"],"is_preprint":false},{"year":2012,"finding":"GPS2 exerts a nontranscriptional, cytoplasmic role as guardian against hyperinflammation by inhibiting TRAF2/Ubc13 enzymatic activity, thereby specifically modulating RIP1 ubiquitylation and JNK activation in the TNF-α pathway. In vivo, aP2-GPS2 transgenic mice show inhibition of TNF-α target genes in macrophages and improved insulin signaling in adipose tissue.","method":"In vitro Ubc13 enzymatic assay, co-immunoprecipitation, ubiquitination assay, transgenic mouse model, macrophage gene expression analysis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro enzymatic assay combined with in vivo transgenic mouse validation and multiple cellular assays","pmids":["22424771"],"is_preprint":false},{"year":2012,"finding":"RNAi-mediated depletion of GPS2 from cultured human adipocytes promotes derepression of inflammatory transcription and elevation of IL-6 and MCP-1. GPS2 and SMRT expression in adipose tissue is regulated upstream by a PPARγ-TWIST1 regulatory cascade.","method":"RNAi knockdown, RT-qPCR, ELISA, ChIP, patient tissue analysis, pioglitazone treatment","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi with defined inflammatory gene readouts plus ChIP occupancy data, single lab but with human tissue correlation","pmids":["23221346"],"is_preprint":false},{"year":2014,"finding":"GPS2 promotes promoter-specific binding of PPARγ in adipocytes by priming chromatin through inhibition of the ubiquitin ligase RNF8 and stabilization of the H3K9 histone demethylase KDM4A/JMJD2. This pioneering activity is required for PPARγ-mediated regulation of ATGL and HSL lipolytic enzymes.","method":"Genome-wide ChIP-seq, co-immunoprecipitation, RNAi knockdown, ubiquitination assay, gene expression analysis in adipocytes","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — genome-wide cistrome analysis combined with mechanistic in vitro assays and functional metabolic readouts, single lab with multiple orthogonal methods","pmids":["24953653"],"is_preprint":false},{"year":2014,"finding":"GPS2 can be SUMOylated by SUMO-1 (but not SUMO-2 or -3) at K45 and K71 in the N-terminal coiled-coil domain. SUMOylation stabilizes GPS2 by promoting interaction with TBL1 and reducing ubiquitination, enhances GPS2 transcriptional suppression, and promotes GPS2 nuclear localization. Loss of SUMOylation (K45R/K71R double mutant) causes more GPS2 to appear in the cytosol.","method":"In vivo SUMOylation assay, site-directed mutagenesis, co-immunoprecipitation, subcellular fractionation, reporter assay, cell proliferation assay","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis combined with functional assays and fractionation, single lab with multiple orthogonal methods","pmids":["24943844"],"is_preprint":false},{"year":2015,"finding":"GPS2 is degraded by polyubiquitination via the E3 ubiquitin ligase Siah2. Interaction with TBL1 protects GPS2 from Siah2-mediated proteasomal degradation. Methylation of GPS2 by the arginine methyltransferase PRMT6 regulates the GPS2-TBL1 interaction and inhibits proteasome-dependent degradation.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, proteasome inhibitor experiments, methyltransferase assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro ubiquitination assay, Co-IP for complex interactions, functional degradation rescue, single lab","pmids":["26070566"],"is_preprint":false},{"year":2016,"finding":"Macrophage-specific Gps2 knockout mice show inappropriate corepressor complex function, enhancer activation, pro-inflammatory gene expression, and hypersensitivity toward metabolic-stress signals, demonstrating GPS2 controls the macrophage epigenome during activation by metabolic stress.","method":"Macrophage-specific Gps2 knockout mice, bone marrow transplantation, ChIP-seq, transcriptome analysis, ATAC-seq","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific knockout with genome-wide epigenomic characterization and functional metabolic readouts, replicated by multiple subsequent studies","pmids":["27270589"],"is_preprint":false},{"year":2016,"finding":"GPS2 inhibits Ubc13-mediated K63 ubiquitination of AKT, preventing AKT activation in the insulin signaling pathway. Adipose-specific deletion of GPS2 results in sustained AKT activation, obesity under normal chow, but improved systemic insulin sensitivity due to non-inflamed adipose tissue.","method":"In vitro Ubc13 enzymatic inhibition assay, ubiquitination assay, adipo-specific GPS2 knockout mice, insulin signaling analysis","journal":"Molecular metabolism","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro enzymatic assay plus in vivo genetic validation with defined metabolic phenotype readouts","pmids":["28123943"],"is_preprint":false},{"year":2016,"finding":"GPS2 is required to restrict TLR, BCR, and AKT/FOXO1 signaling in B cells through direct inhibition of Ubc13 enzymatic activity. B cell-targeted GPS2 deletion causes developmental defects at multiple stages of B cell differentiation.","method":"In vitro Ubc13 enzymatic inhibition assay, B cell-specific GPS2 knockout mice, flow cytometry, ubiquitination assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — enzymatic assay combined with in vivo B cell-specific knockout, single lab","pmids":["28039360"],"is_preprint":false},{"year":2018,"finding":"GPS2 mediates mitochondrial retrograde signaling by translocating directly from mitochondria to nucleus in response to mitochondrial depolarization. In the nucleus, GPS2 regulates histone H3K9 demethylation and RNA Pol2 activation through inhibition of Ubc13-mediated ubiquitination, activating nuclear-encoded mitochondrial genes.","method":"Live-cell imaging, subcellular fractionation, ChIP, RNA Pol2 ChIP, ubiquitination assay, adipocyte differentiation model, brown adipose tissue analysis in mice","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct live imaging of mitochondria-to-nucleus translocation combined with genome-wide ChIP and in vivo mouse tissue validation, multiple orthogonal methods","pmids":["29499132"],"is_preprint":false},{"year":2018,"finding":"GPS2 cooperates with the LPS-inducible NF-κB subunit p65 (but not LXRs or corepressor complex subunits) to activate ABCA1 expression and cholesterol efflux in macrophages upon LPS stimulation.","method":"ChIP, RNAi knockdown, cholesterol efflux assay, reporter assay in mouse and human macrophages","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP with RNAi knockdown and functional efflux assay, single lab","pmids":["30153049"],"is_preprint":false},{"year":2018,"finding":"Adipocyte-specific GPS2 deficiency causes adipocyte hypertrophy, inflammation, and mitochondrial dysfunction driven by HIF1A activation. Pharmacological or genetic HIF1A inhibition reverses this phenotype, placing GPS2 upstream of HIF1A in adipocyte remodeling.","method":"Adipocyte-specific GPS2 knockout mice, HIF1A inhibitor treatment, genetic HIF1A deletion, transcriptome analysis, mitochondrial function assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — adipocyte-specific KO with epistasis confirmation by pharmacological and genetic HIF1A inhibition, multiple orthogonal methods","pmids":["30208320"],"is_preprint":false},{"year":2019,"finding":"GPS2, as a subunit of the NCOR-HDAC3 complex, acts as a direct repressor of PPARα in hepatocytes. Hepatocyte-specific Gps2 knockout alleviates diet-induced steatosis and fibrosis and causes activation of lipid catabolic genes through PPARα de-repression.","method":"Hepatocyte-specific Gps2 knockout mice, integrative cistrome/epigenome/transcriptome analysis, ChIP-seq, diet-induced NASH model","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific knockout with genome-wide cistrome and epigenome integration, validated with human patient data","pmids":["30975991"],"is_preprint":false},{"year":2020,"finding":"GPS2 interacts with erythroid transcription factor EKLF and prevents proteasome-mediated degradation of EKLF, thereby increasing EKLF stability and transcriptional activity. The amino acids 191-230 region of EKLF mediates GPS2 binding and is essential for EKLF stability. GPS2 knockout mice show impaired erythropoiesis and severe anemia.","method":"Co-immunoprecipitation, proteasome inhibitor assay, domain mapping by deletion mutagenesis, GPS2 knockout mice, xenotransplantation of human CD34+ cells, flow cytometry","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP with domain mapping, in vivo GPS2 knockout phenotype, and xenograft validation; multiple orthogonal methods","pmids":["32384137"],"is_preprint":false},{"year":2021,"finding":"GPS2 and SMRT corepressors co-occupy candidate enhancers with coactivators CBP and MED1 but antagonistically repress eRNA transcription-coupled H3K27 acetylation. Corepressor depletion or inflammatory signaling similarly triggers enhancer activation. The GPS2/SMRT corepressor complex controls Ccl2 transcription by repressing eRNA at enhancer elements.","method":"ChIP-seq, ATAC-seq, genome editing (CRISPR), transcriptional interference, 4C-seq, eRNA analysis, ob/ob mouse adipose tissue macrophage experiments","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide profiling combined with CRISPR editing, 3D chromatin analysis, and in vivo mouse validation; multiple orthogonal methods","pmids":["33503407"],"is_preprint":false},{"year":2021,"finding":"GPS2 directly interacts with influenza A virus NEP protein (confirmed by GST-pulldown and co-IP). GPS2 inhibits viral RNA synthesis by reducing IAV polymerase (PB1-PB2) interaction and vRNP assembly. NEP mediates nuclear export of GPS2 and promotes its degradation, thereby overcoming GPS2-mediated inhibition of viral replication.","method":"Yeast two-hybrid, GST-pulldown, co-immunoprecipitation, GPS2 knockdown/knockout/overexpression, viral titer measurement, viral RNA synthesis assay","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple binding validation methods plus functional viral replication assays, single lab","pmids":["33658351"],"is_preprint":false},{"year":2013,"finding":"GPS2 directly interacts with HCV NS5A protein (domain I of NS5A and the coiled-coil domain of GPS2 mediate the interaction) and is required for NS5A association with the proviral host factor VAP-A. Knockdown of GPS2 suppresses HCV RNA replication, rescued by RNAi-resistant GPS2 re-expression.","method":"Co-immunoprecipitation in mammalian cells, mutagenesis, RNAi knockdown with rescue experiment, HCV RNA replication assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mapping by mutagenesis, RNAi with rescue for specificity, functional replication assay, single lab","pmids":["24223774"],"is_preprint":false},{"year":2023,"finding":"GPS2 represses IL4-dependent enhancer activation in macrophages by cooperating with SMRT and NCOR to antagonize the lysine demethylase KDM1A (LSD1). Corepressor depletion increases KDM1A recruitment to enhancers, causing demethylation of repressive H3K9me2/3 marks and enhancer/gene activation independent of IL4/STAT6.","method":"Genome-wide ChIP-seq, ATAC-seq, ChIP for histone marks, RNAi knockdown, co-immunoprecipitation, macrophage IL4 stimulation assays","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide mechanistic analysis with multiple histone mark readouts, validated in two macrophage models, defines molecular epistasis","pmids":["36610795"],"is_preprint":false},{"year":2024,"finding":"GPS2 inhibits K63 ubiquitination of RNA-binding and translation proteins (including PABPC1, RPS1, RACK1, eIF3M) on the outer mitochondrial membrane via Ubc13 inhibition. Removal of GPS2-mediated inhibition (by genetic deletion or stress-induced nuclear translocation) promotes import-coupled translation of nuclear-encoded mitochondrial proteins and increases expression of an adaptive antioxidant program.","method":"K63 ubiquitome profiling (mass spectrometry), GPS2 knockout cells, nuclear translocation assay, mitochondrial translation assay, protein interaction validation","journal":"Pharmacological research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteome-scale ubiquitome mapping with selected target validation, GPS2 KO functional readouts, single lab","pmids":["39094987"],"is_preprint":false},{"year":2024,"finding":"GPS2 promotes erythroid differentiation in K562 cells primarily via NCOR1; GPS2 lacking the NCOR1-binding domain fails to promote differentiation, and NCOR1 knockdown abolishes GPS2's promotive effect on hemoglobin synthesis.","method":"GPS2 overexpression/knockdown, domain deletion mutants, NCOR1 knockdown, hemin/Ara-C induced differentiation assay, benzidine staining, globin gene expression","journal":"International journal of hematology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis by domain deletion and NCOR1 knockdown, functional differentiation readouts, single lab","pmids":["38814500"],"is_preprint":false},{"year":2025,"finding":"GPS2 binds the NZF domain of HOIP (catalytic subunit of LUBAC) and inhibits K48-linked polyubiquitination of HOIP at K579, K737, and K988, thereby preventing HOIP proteasomal degradation, maintaining LUBAC stability and NF-κB activation. EC-specific GPS2 deletion causes HOIP degradation, reduced TNF-induced NF-κB activation, increased cell-death complex-II formation, and embryonic lethality due to defective vascularization.","method":"Co-immunoprecipitation, site-directed mutagenesis of ubiquitination sites, EC-specific GPS2 knockout mice, TNFR1 double-knockout rescue, ubiquitination assay, embryonic vascular analysis","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — mutagenesis of specific ubiquitination sites combined with in vivo genetic rescue (TNFR1 KO) and multiple cellular assays","pmids":["41507360"],"is_preprint":false},{"year":2025,"finding":"GPS2 binds ATF4 and inhibits ubiquitin-proteasome-dependent degradation of ATF4 by impairing the interaction between ATF4 and the E3 ubiquitin ligase BTRC, thereby stabilizing ATF4 and elevating downstream ASNS expression to confer L-asparaginase resistance in ALL cells.","method":"Co-immunoprecipitation, ubiquitination assay, GPS2 knockdown/overexpression, in vitro ATF4 degradation assay, xenograft mouse model","journal":"Carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ubiquitination assay with in vivo xenograft validation, single lab","pmids":["40693356"],"is_preprint":false},{"year":2009,"finding":"GPS2 is differentially methylated at arginine within the peptide SQNPRFYHK, and this methylation state is recognized by the immune system; only the monomethylated variant induces T-cell responses. Recombinant GPS2 can be radiolabeled in vitro by arginine methyltransferase activity.","method":"2D nano-HPLC/mass spectrometry of HLA peptidomes, ELISpot assay, in vitro radiolabeling with recombinant GPS2","journal":"FASEB journal","confidence":"Low","confidence_rationale":"Tier 3 / Weak — novel methylation site identified by MS with in vitro validation, single lab, primarily immunological readout","pmids":["19917673"],"is_preprint":false},{"year":2025,"finding":"GPS2, as a component of the NCoR complex, mediates the interaction between ANKRD26 and ETV6 in megakaryopoiesis; GPS2 binds both ANKRD26 and ETV6, and ANKRD26 overexpression deregulates ETV6 transcriptional repression through this GPS2-mediated axis.","method":"Co-immunoprecipitation, subcellular localization assay, reporter assay, in vitro interaction mapping","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP validated GPS2-ANKRD26 and GPS2-ETV6 interactions with functional transcriptional readout, single lab","pmids":["39791724"],"is_preprint":false},{"year":2025,"finding":"SMRT uniquely controls the chromatin binding and nuclear localization of GPS2, NCOR, and HDAC3, acting as the chromatin anchor for the corepressor complex in macrophages.","method":"ChIP-seq, ATAC-seq, corepressor depletion (SMRT/NCOR knockdown), transcriptome analysis in RAW264.7 and BMDM cells","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 2 / Weak — genome-wide ChIP-seq with knockdown, preprint not yet peer-reviewed, single lab","pmids":[],"is_preprint":true},{"year":2012,"finding":"GPS2 interacts with ANKRD26, and GPS2 (along with DIPA) is normally located in the nucleus but is translocated to the cytoplasm when the C-terminus of ANKRD26 is introduced into cells. GPS2 downregulation increases adipogenesis in 3T3-L1 cells.","method":"Yeast two-hybrid, co-immunoprecipitation, subcellular localization assay, RNAi knockdown, adipogenesis assay","journal":"PloS one","confidence":"Low","confidence_rationale":"Tier 3 / Weak — yeast two-hybrid with Co-IP, localization shift assay, functional adipogenesis readout, single lab","pmids":["22666460"],"is_preprint":false}],"current_model":"GPS2 is a multifunctional protein that operates both as an integral subunit of the N-CoR/SMRT-HDAC3 nuclear corepressor complex—where it regulates transcription of metabolic, inflammatory, and developmental genes by controlling histone demethylation, corepressor complex stability, and eRNA transcription at enhancers—and as a cytoplasmic inhibitor of the E2 ubiquitin-conjugating enzyme Ubc13, thereby restricting K63-linked non-proteolytic ubiquitination of substrates including RIP1, AKT, and mitochondria-associated translation factors to modulate TNF-α/JNK signaling, insulin signaling, and mitochondrial gene expression; GPS2 also undergoes regulated mitochondria-to-nucleus translocation as a retrograde signaling mechanism, is itself subject to post-translational regulation by SUMOylation (SUMO-1 at K45/K71), arginine methylation (PRMT6), and proteasomal degradation (Siah2, countered by TBL1), and stabilizes partner proteins including EKLF and HOIP by blocking their ubiquitin-mediated degradation."},"narrative":{"mechanistic_narrative":"GPS2 is a dual-function regulator that controls gene expression in the nucleus and ubiquitin-dependent signaling in the cytoplasm. As an integral subunit of the N-CoR/SMRT-HDAC3 nuclear corepressor complex, it interacts cooperatively with TBL1 at the N-CoR repression domain to form a heterotrimeric platform that restrains transcription [PMID:11931768], and it functions as a stoichiometric corepressor across diverse transcription factors governing bile acid biosynthesis, cholesterol handling, and lipid metabolism [PMID:17895379, PMID:19481530]. At enhancers, the GPS2/SMRT complex sets the chromatin state by antagonizing histone demethylases—stabilizing KDM4A/JMJD2 to prime H3K9-demethylated chromatin for PPARγ binding while restraining KDM1A/LSD1 and eRNA-coupled H3K27 acetylation—so that its loss derepresses inflammatory and metabolic gene programs [PMID:24953653, PMID:33503407, PMID:36610795]. Through this corepressor activity GPS2 directly represses PPARα in hepatocytes and constrains the macrophage epigenome during metabolic stress, with cell-type-specific deletion driving inflammation, steatosis, and stress hypersensitivity [PMID:27270589, PMID:30975991]. In parallel, GPS2 acts non-transcriptionally as an inhibitor of the E2 enzyme Ubc13, blocking K63-linked ubiquitination of RIP1 and AKT to limit TNF-α/JNK and insulin signaling [PMID:22424771, PMID:28123943]; the same activity restricts B-cell signaling and shapes nuclear-encoded mitochondrial gene expression following its regulated mitochondria-to-nucleus translocation upon depolarization [PMID:28039360, PMID:29499132]. GPS2 further stabilizes partner proteins by blocking their ubiquitin-mediated degradation, protecting EKLF to sustain erythropoiesis and the LUBAC catalytic subunit HOIP to maintain NF-κB activation and vascular development [PMID:32384137, PMID:41507360]. GPS2 is itself controlled post-translationally by SUMO-1 modification at K45/K71, which promotes TBL1 binding and nuclear retention, and by Siah2-mediated degradation that is countered by TBL1 and PRMT6 methylation [PMID:24943844, PMID:26070566].","teleology":[{"year":2002,"claim":"Established GPS2 as a structural subunit of a defined transcriptional corepressor complex rather than a free-standing factor, anchoring all subsequent functional studies.","evidence":"Co-IP, biochemical reconstitution, and JNK reporter assays mapping GPS2-TBL1-N-CoR-HDAC3 architecture","pmids":["11931768"],"confidence":"High","gaps":["Did not resolve atomic structure of the GPS2-TBL1-N-CoR interface","Mechanism of HDAC3 activation by SANT domain not linked to GPS2 directly"]},{"year":2001,"claim":"Early work linked GPS2 to coactivation and tumor suppressor pathways (p300, p53), framing it as a context-dependent transcriptional cofactor before its corepressor identity was consolidated.","evidence":"Co-IP, in vitro binding, reporter and cell-cycle/apoptosis assays in U2OS cells","pmids":["10846067","11486030"],"confidence":"Medium","gaps":["Coactivator role not reconciled with later corepressor function","Whether p53/p300 effects are direct or complex-mediated unresolved"]},{"year":2009,"claim":"Defined GPS2 as a functional epigenetic regulator at specific metabolic loci, connecting corepressor occupancy to histone H3K9 demethylation and physiologic cholesterol efflux.","evidence":"RNAi, ChIP, cholesterol efflux assays, and histone methylation analysis at ABCG1; SMRT complex domain mapping; transrepression studies in LXR/SUMO-1 knockout mice","pmids":["19481530","19858209","20159957"],"confidence":"High","gaps":["Identity of the recruited demethylase not established at this stage","Direct versus indirect effect on H3K9 marks unresolved"]},{"year":2012,"claim":"Revealed a wholly separate cytoplasmic function—GPS2 inhibits TRAF2/Ubc13 to restrict K63 ubiquitination of RIP1 and JNK activation—linking GPS2 to inflammation control and insulin sensitivity in vivo.","evidence":"In vitro Ubc13 enzymatic assays, ubiquitination assays, aP2-GPS2 transgenic mice, and adipocyte RNAi with inflammatory readouts","pmids":["22424771","23221346"],"confidence":"High","gaps":["Structural basis of Ubc13 inhibition not defined","Nuclear/cytoplasmic pool partitioning not quantified"]},{"year":2014,"claim":"Mechanistically unified the corepressor and ubiquitin functions by showing GPS2 primes chromatin for PPARγ via ubiquitin-ligase inhibition and demethylase stabilization, and identified SUMOylation as a regulator of GPS2 stability and localization.","evidence":"ChIP-seq, ubiquitination assays, and gene expression in adipocytes; in vivo SUMOylation assays with K45R/K71R mutants and fractionation","pmids":["24953653","24943844"],"confidence":"High","gaps":["How chromatin priming integrates with the N-CoR complex unclear","SUMO-1 specificity over SUMO-2/3 mechanistically unexplained"]},{"year":2016,"claim":"Cell-type-specific knockouts dissected GPS2's tissue roles, demonstrating it controls the macrophage epigenome, restrains AKT via Ubc13, and governs B-cell development and metabolic phenotypes.","evidence":"Macrophage-, adipocyte-, and B-cell-specific Gps2 knockout mice with ChIP-seq/ATAC-seq, insulin signaling, and flow cytometry","pmids":["27270589","28123943","28039360"],"confidence":"High","gaps":["Relative contribution of nuclear versus cytoplasmic functions per tissue not separated","Whether obesity-with-insulin-sensitivity uncoupling generalizes beyond adipose unresolved"]},{"year":2018,"claim":"Identified mitochondria-to-nucleus retrograde signaling as a trigger that converts the cytoplasmic Ubc13-inhibitory function into a nuclear transcriptional response activating mitochondrial genes; placed GPS2 upstream of HIF1A in adipocyte remodeling.","evidence":"Live-cell imaging of translocation, ChIP, RNA Pol2 ChIP; adipocyte-specific KO with HIF1A genetic/pharmacologic epistasis","pmids":["29499132","30208320"],"confidence":"High","gaps":["Molecular trigger and transport machinery for translocation unknown","Link between HIF1A and the corepressor/Ubc13 activities not defined"]},{"year":2019,"claim":"Extended corepressor function to hepatic disease, showing GPS2 directly represses PPARα and that its loss alleviates steatosis and fibrosis through lipid-catabolic gene de-repression.","evidence":"Hepatocyte-specific Gps2 knockout with integrative cistrome/epigenome/transcriptome and diet-induced NASH model","pmids":["30975991"],"confidence":"High","gaps":["Therapeutic window of GPS2 inhibition versus inflammatory derepression not addressed","Human relevance limited to correlative data"]},{"year":2020,"claim":"Demonstrated GPS2 stabilizes partner transcription factors against degradation, with EKLF protection required for normal erythropoiesis, revealing a protein-stabilizing arm distinct from corepression.","evidence":"Co-IP, proteasome inhibitor and domain-mapping assays, GPS2 knockout mice with anemia, and CD34+ xenotransplantation","pmids":["32384137"],"confidence":"High","gaps":["Whether stabilization depends on Ubc13 inhibition or a distinct mechanism unclear","E3 ligase targeting EKLF not identified"]},{"year":2021,"claim":"Resolved how the GPS2/SMRT complex represses enhancers, showing co-occupancy with coactivators but antagonism of eRNA-coupled H3K27 acetylation to control inflammatory gene loci.","evidence":"ChIP-seq, ATAC-seq, CRISPR editing, 4C-seq, and eRNA analysis with ob/ob adipose tissue macrophages","pmids":["33503407"],"confidence":"High","gaps":["Mechanism that toggles complex from repressive to permissive state unresolved","Direct molecular target of eRNA repression not defined"]},{"year":2023,"claim":"Identified KDM1A/LSD1 antagonism as the demethylase mechanism by which GPS2/SMRT/NCOR keep repressive H3K9me2/3 marks intact at IL4-responsive enhancers, independent of STAT6.","evidence":"Genome-wide ChIP-seq, ATAC-seq, histone-mark ChIP, RNAi, and Co-IP across two macrophage models","pmids":["36610795"],"confidence":"High","gaps":["How corepressor depletion increases KDM1A recruitment mechanistically unclear","Interplay with the KDM4A-stabilizing activity not reconciled"]},{"year":2024,"claim":"Mapped the mitochondrial Ubc13-inhibitory targets at proteome scale, showing GPS2 restrains K63 ubiquitination of outer-membrane translation factors to gate import-coupled translation and an antioxidant program.","evidence":"K63 ubiquitome mass spectrometry, GPS2 KO cells, translocation and mitochondrial translation assays","pmids":["39094987"],"confidence":"Medium","gaps":["Causality between individual ubiquitination events and translation not fully established","Single-lab proteomic dataset awaits independent validation"]},{"year":2025,"claim":"Demonstrated GPS2 stabilizes the LUBAC catalytic subunit HOIP by blocking K48 ubiquitination, establishing an essential pro-survival/NF-κB role in endothelial cells and vascular development.","evidence":"Co-IP, site-directed mutagenesis of HOIP ubiquitination sites, EC-specific Gps2 KO mice with TNFR1 double-knockout rescue and embryonic vascular analysis","pmids":["41507360"],"confidence":"High","gaps":["E3 ligase mediating HOIP K48 ubiquitination not identified","Whether HOIP stabilization is independent of Ubc13 inhibition unresolved"]},{"year":2025,"claim":"Extended GPS2's protein-stabilizing and corepressor roles into cancer and hematopoietic contexts, stabilizing ATF4 to drive asparaginase resistance and mediating ANKRD26-ETV6 transcriptional control in megakaryopoiesis.","evidence":"Co-IP, ubiquitination/degradation assays, xenograft model (ATF4); Co-IP and reporter assays for ANKRD26-ETV6 axis","pmids":["40693356","39791724"],"confidence":"Medium","gaps":["Generality of ATF4 stabilization across tumor types untested","Mechanism by which GPS2 bridges ANKRD26 and ETV6 not structurally defined"]},{"year":null,"claim":"How GPS2's nuclear corepressor function, cytoplasmic Ubc13 inhibition, and target-protein stabilization are coordinated, and what governs the partitioning and translocation between these activities, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model integrating the distinct functional modules","Trigger and machinery governing subcellular redistribution not defined","Whether protein-stabilization arm is mechanistically the same as Ubc13 inhibition unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,5,7,21,23]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[10,16,29,14]},{"term_id":"GO:0140313","term_label":"molecular sequestering activity","supporting_discovery_ids":[22,29,30]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,13,18]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[10,13,16]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[18,27]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,7,21,23,26]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[12,23,26]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[10,16,29]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[10,15,17,29]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[5,7,12,21]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[14,22,29,30]}],"complexes":["N-CoR/SMRT-HDAC3 corepressor complex","LUBAC"],"partners":["NCOR1","SMRT","TBL1","HDAC3","UBE2N","HOIP","EKLF","ATF4"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q13227","full_name":"G protein pathway suppressor 2","aliases":[],"length_aa":327,"mass_kda":36.7,"function":"Key regulator of inflammation, lipid metabolism and mitochondrion homeostasis that acts by inhibiting the activity of the ubiquitin-conjugating enzyme UBE2N/Ubc13, thereby inhibiting 'Lys-63'-linked ubiquitination (By similarity). In the nucleus, can both acts as a corepressor and coactivator of transcription, depending on the context (PubMed:24943844). Acts as a transcription coactivator in adipocytes by promoting the recruitment of PPARG to promoters: acts by inhibiting the activity of the ubiquitin-conjugating enzyme UBE2N/Ubc13, leading to stabilization of KDM4A and subsequent histone H3 'Lys-9' (H3K9) demethylation (By similarity). Promotes cholesterol efflux by acting as a transcription coactivator (PubMed:19481530). Acts as a regulator of B-cell development by inhibiting UBE2N/Ubc13, thereby restricting the activation of Toll-like receptors (TLRs) and B-cell antigen receptors (BCRs) signaling pathways (By similarity). Acts as a key mediator of mitochondrial stress response: in response to mitochondrial depolarization, relocates from the mitochondria to the nucleus following desumoylation and specifically promotes expression of nuclear-encoded mitochondrial genes (PubMed:29499132). Promotes transcription of nuclear-encoded mitochondrial genes by inhibiting UBE2N/Ubc13 (PubMed:29499132). Can also act as a corepressor as part of the N-Cor repressor complex by repressing active PPARG (PubMed:19858209, PubMed:24943844). Plays an anti-inflammatory role in macrophages and is required for insulin sensitivity by acting as a corepressor (By similarity). Plays an anti-inflammatory role during the hepatic acute phase response by interacting with sumoylated NR1H2 and NR5A2 proteins, thereby preventing N-Cor corepressor complex dissociation (PubMed:20159957). In the cytosol, also plays a non-transcriptional role by regulating insulin signaling and pro-inflammatory pathways (By similarity). In the cytoplasm, acts as a negative regulator of inflammation by inhibiting the pro-inflammatory TNF pathway; acts by repressing UBE2N/Ubc13 activity (By similarity). In the cytoplasm of adipocytes, restricts the activation of insulin signaling via inhibition of UBE2N/Ubc13-mediated ubiquitination of AKT (By similarity). Able to suppress G-protein- and mitogen-activated protein kinase-mediated signal transduction (PubMed:8943324). Acts as a tumor-suppressor in liposarcoma (PubMed:27460081) (Microbial infection) Required for efficient replication of hepatitis C virus (HCV) by promoting the interaction between VAPA and HCV virus protein NS5A","subcellular_location":"Nucleus; Mitochondrion; Cytoplasm, cytosol","url":"https://www.uniprot.org/uniprotkb/Q13227/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/GPS2","classification":"Not Classified","n_dependent_lines":30,"n_total_lines":1208,"dependency_fraction":0.024834437086092714},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"HDAC3","stoichiometry":10.0}],"url":"https://opencell.sf.czbiohub.org/search/GPS2","total_profiled":1310},"omim":[{"mim_id":"608628","title":"TRANSDUCIN-BETA-LIKE 1 RECEPTOR 1; TBL1XR1","url":"https://www.omim.org/entry/608628"},{"mim_id":"605166","title":"HISTONE DEACETYLASE 3; HDAC3","url":"https://www.omim.org/entry/605166"},{"mim_id":"603076","title":"ATP-BINDING CASSETTE, SUBFAMILY G, MEMBER 1; ABCG1","url":"https://www.omim.org/entry/603076"},{"mim_id":"601935","title":"G PROTEIN PATHWAY SUPPRESSOR 2; GPS2","url":"https://www.omim.org/entry/601935"},{"mim_id":"601934","title":"G PROTEIN PATHWAY SUPPRESSOR 1; GPS1","url":"https://www.omim.org/entry/601934"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/GPS2"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q13227","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13227","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q13227-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q13227-F1-predicted_aligned_error_v6.png","plddt_mean":62.22},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GPS2","jax_strain_url":"https://www.jax.org/strain/search?query=GPS2"},"sequence":{"accession":"Q13227","fasta_url":"https://rest.uniprot.org/uniprotkb/Q13227.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q13227/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13227"}},"corpus_meta":[{"pmid":"11931768","id":"PMC_11931768","title":"The N-CoR-HDAC3 nuclear receptor corepressor complex inhibits the JNK pathway through the integral subunit GPS2.","date":"2002","source":"Molecular 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pathways","date":"2025-05-15","source":"bioRxiv","url":"https://doi.org/10.1101/2025.05.13.653058","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":23305,"output_tokens":8384,"usd":0.097837,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":18279,"output_tokens":5272,"usd":0.111598,"stage2_stop_reason":"end_turn"},"total_usd":0.209435,"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\": 2002,\n      \"finding\": \"GPS2 is an integral subunit of the N-CoR-HDAC3 nuclear receptor corepressor complex. GPS2 and TBL1 interact cooperatively with repression domain 1 of N-CoR to form a heterotrimeric structure and are indirectly linked to HDAC3 via an extended N-CoR SANT domain that also activates latent HDAC3 activity. The N-CoR-HDAC3 complex inhibits JNK activation through its associated GPS2 subunit.\",\n      \"method\": \"Co-immunoprecipitation, biochemical reconstitution, functional reporter assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — reconstitution of stable complex, structural motif mapping, functional JNK inhibition assay, foundational study replicated by many subsequent works\",\n      \"pmids\": [\"11931768\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"GPS2 (AMF-1) binds the transcriptional coactivator p300 both in vitro and in vivo, and recruits p300 into a complex with papillomavirus E2 protein, facilitating histone acetylase activity recruitment and E2-dependent transcriptional activation.\",\n      \"method\": \"In vitro binding assay, co-immunoprecipitation, co-transfection reporter assay, histone acetyltransferase immunoprecipitation\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, in vitro binding, functional reporter assay, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"10846067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"GPS2 (AMF-1) associates with p53 both in vivo and in vitro and facilitates p53-dependent transcription. Overexpression of GPS2 in U2OS cells increases basal p21(WAF1/CIP1) expression, causes G1 arrest, and increases apoptosis upon UV irradiation.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding, reporter assay, flow cytometry, cell viability assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus in vitro binding, functional cellular assays, single lab\",\n      \"pmids\": [\"11486030\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"GPS2 interacts with HPV E6 proteins from both high- and low-risk HPV types. High-risk E6 induces degradation of GPS2 in vivo (but not in vitro) and suppresses GPS2 transcriptional activation activity.\",\n      \"method\": \"Yeast two-hybrid, co-transfection, pulse-chase analysis, transcriptional reporter assay\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — yeast two-hybrid validated by cellular degradation assays and functional transcription assays, single lab\",\n      \"pmids\": [\"11119584\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"GPS2 interacts specifically with the hMSH4-hMSH5 heterocomplex (not with hMSH4 or hMSH5 alone), mediated through the interface of the hMSH4-hMSH5 complex and the N-terminal region of GPS2, suggesting GPS2-associated deacetylase complex functions with hMSH4-hMSH5 in homologous recombination.\",\n      \"method\": \"Co-immunoprecipitation in human cells, interaction mapping with deletion mutants, yeast two-hybrid\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP with domain mapping, interaction validated in human cells, single lab\",\n      \"pmids\": [\"16122992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"GPS2 directly interacts with SHP, LRH-1, HNF4alpha, and FXR, acting as a differential coregulator of CYP7A1 and CYP8B1 expression in bile acid biosynthesis pathways, with GPS2 being a stoichiometric subunit of a conserved corepressor complex.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, reporter assay, RNAi knockdown\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple binding partners validated by Co-IP and ChIP, functional gene regulation confirmed by RNAi, single lab\",\n      \"pmids\": [\"17895379\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"GPS2 interacts with the brain-specific transcription factor RFX4_v3, co-localizes with it in the nucleus, is recruited by RFX4_v3 to the Cx3cl1 promoter, and potentiates RFX4_v3-dependent transactivation through X-box 1. GPS2 binds both the C-terminal (amino acids 575-735) and middle (amino acids 250-574) regions of RFX4_v3.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, indirect immunofluorescence, ChIP, reporter assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (Y2H, Co-IP, ChIP, reporter), single lab\",\n      \"pmids\": [\"18218630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"GPS2 is required for ABCG1 cholesterol transporter gene transcription and cholesterol efflux from macrophages. GPS2 facilitates LXR recruitment to an ABCG1-specific promoter/enhancer unit upon ligand activation and is functionally linked to histone H3K9 demethylation at this locus.\",\n      \"method\": \"RNAi knockdown, ChIP, cholesterol efflux assay, reporter assay, histone methylation analysis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (RNAi, ChIP, efflux assay, epigenetic analysis), replicated in subsequent studies\",\n      \"pmids\": [\"19481530\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"GPS2 is a stable component of SMRT corepressor complexes with the repression domain mapped to the N-terminal SMRT-interacting domain. GPS2 knockdown abrogates SMRT-mediated repression; GPS2 depletion also enhanced estradiol-induced ERα target gene expression and promoted MCF-7 cell proliferation.\",\n      \"method\": \"Co-immunoprecipitation, RNAi knockdown, ChIP, reporter assay, cell proliferation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, domain mapping, ChIP and functional assays, single lab\",\n      \"pmids\": [\"19858209\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"GPS2 functions as a transrepression mediator connecting SUMOylated nuclear receptors (LRH-1 and LXRbeta) to the N-CoR corepressor complex at hepatic acute phase response promoters, preventing clearance of the corepressor complex upon cytokine stimulation.\",\n      \"method\": \"ChIP, Co-immunoprecipitation, reporter assay, LXR knockout mice, SUMO-1 knockout mice\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods including knockout mouse models, ChIP, and Co-IP; replicated in subsequent works\",\n      \"pmids\": [\"20159957\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"GPS2 exerts a nontranscriptional, cytoplasmic role as guardian against hyperinflammation by inhibiting TRAF2/Ubc13 enzymatic activity, thereby specifically modulating RIP1 ubiquitylation and JNK activation in the TNF-α pathway. In vivo, aP2-GPS2 transgenic mice show inhibition of TNF-α target genes in macrophages and improved insulin signaling in adipose tissue.\",\n      \"method\": \"In vitro Ubc13 enzymatic assay, co-immunoprecipitation, ubiquitination assay, transgenic mouse model, macrophage gene expression analysis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro enzymatic assay combined with in vivo transgenic mouse validation and multiple cellular assays\",\n      \"pmids\": [\"22424771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RNAi-mediated depletion of GPS2 from cultured human adipocytes promotes derepression of inflammatory transcription and elevation of IL-6 and MCP-1. GPS2 and SMRT expression in adipose tissue is regulated upstream by a PPARγ-TWIST1 regulatory cascade.\",\n      \"method\": \"RNAi knockdown, RT-qPCR, ELISA, ChIP, patient tissue analysis, pioglitazone treatment\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi with defined inflammatory gene readouts plus ChIP occupancy data, single lab but with human tissue correlation\",\n      \"pmids\": [\"23221346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"GPS2 promotes promoter-specific binding of PPARγ in adipocytes by priming chromatin through inhibition of the ubiquitin ligase RNF8 and stabilization of the H3K9 histone demethylase KDM4A/JMJD2. This pioneering activity is required for PPARγ-mediated regulation of ATGL and HSL lipolytic enzymes.\",\n      \"method\": \"Genome-wide ChIP-seq, co-immunoprecipitation, RNAi knockdown, ubiquitination assay, gene expression analysis in adipocytes\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — genome-wide cistrome analysis combined with mechanistic in vitro assays and functional metabolic readouts, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"24953653\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"GPS2 can be SUMOylated by SUMO-1 (but not SUMO-2 or -3) at K45 and K71 in the N-terminal coiled-coil domain. SUMOylation stabilizes GPS2 by promoting interaction with TBL1 and reducing ubiquitination, enhances GPS2 transcriptional suppression, and promotes GPS2 nuclear localization. Loss of SUMOylation (K45R/K71R double mutant) causes more GPS2 to appear in the cytosol.\",\n      \"method\": \"In vivo SUMOylation assay, site-directed mutagenesis, co-immunoprecipitation, subcellular fractionation, reporter assay, cell proliferation assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis combined with functional assays and fractionation, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"24943844\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"GPS2 is degraded by polyubiquitination via the E3 ubiquitin ligase Siah2. Interaction with TBL1 protects GPS2 from Siah2-mediated proteasomal degradation. Methylation of GPS2 by the arginine methyltransferase PRMT6 regulates the GPS2-TBL1 interaction and inhibits proteasome-dependent degradation.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, proteasome inhibitor experiments, methyltransferase assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro ubiquitination assay, Co-IP for complex interactions, functional degradation rescue, single lab\",\n      \"pmids\": [\"26070566\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Macrophage-specific Gps2 knockout mice show inappropriate corepressor complex function, enhancer activation, pro-inflammatory gene expression, and hypersensitivity toward metabolic-stress signals, demonstrating GPS2 controls the macrophage epigenome during activation by metabolic stress.\",\n      \"method\": \"Macrophage-specific Gps2 knockout mice, bone marrow transplantation, ChIP-seq, transcriptome analysis, ATAC-seq\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific knockout with genome-wide epigenomic characterization and functional metabolic readouts, replicated by multiple subsequent studies\",\n      \"pmids\": [\"27270589\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"GPS2 inhibits Ubc13-mediated K63 ubiquitination of AKT, preventing AKT activation in the insulin signaling pathway. Adipose-specific deletion of GPS2 results in sustained AKT activation, obesity under normal chow, but improved systemic insulin sensitivity due to non-inflamed adipose tissue.\",\n      \"method\": \"In vitro Ubc13 enzymatic inhibition assay, ubiquitination assay, adipo-specific GPS2 knockout mice, insulin signaling analysis\",\n      \"journal\": \"Molecular metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro enzymatic assay plus in vivo genetic validation with defined metabolic phenotype readouts\",\n      \"pmids\": [\"28123943\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"GPS2 is required to restrict TLR, BCR, and AKT/FOXO1 signaling in B cells through direct inhibition of Ubc13 enzymatic activity. B cell-targeted GPS2 deletion causes developmental defects at multiple stages of B cell differentiation.\",\n      \"method\": \"In vitro Ubc13 enzymatic inhibition assay, B cell-specific GPS2 knockout mice, flow cytometry, ubiquitination assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — enzymatic assay combined with in vivo B cell-specific knockout, single lab\",\n      \"pmids\": [\"28039360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"GPS2 mediates mitochondrial retrograde signaling by translocating directly from mitochondria to nucleus in response to mitochondrial depolarization. In the nucleus, GPS2 regulates histone H3K9 demethylation and RNA Pol2 activation through inhibition of Ubc13-mediated ubiquitination, activating nuclear-encoded mitochondrial genes.\",\n      \"method\": \"Live-cell imaging, subcellular fractionation, ChIP, RNA Pol2 ChIP, ubiquitination assay, adipocyte differentiation model, brown adipose tissue analysis in mice\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct live imaging of mitochondria-to-nucleus translocation combined with genome-wide ChIP and in vivo mouse tissue validation, multiple orthogonal methods\",\n      \"pmids\": [\"29499132\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"GPS2 cooperates with the LPS-inducible NF-κB subunit p65 (but not LXRs or corepressor complex subunits) to activate ABCA1 expression and cholesterol efflux in macrophages upon LPS stimulation.\",\n      \"method\": \"ChIP, RNAi knockdown, cholesterol efflux assay, reporter assay in mouse and human macrophages\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP with RNAi knockdown and functional efflux assay, single lab\",\n      \"pmids\": [\"30153049\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Adipocyte-specific GPS2 deficiency causes adipocyte hypertrophy, inflammation, and mitochondrial dysfunction driven by HIF1A activation. Pharmacological or genetic HIF1A inhibition reverses this phenotype, placing GPS2 upstream of HIF1A in adipocyte remodeling.\",\n      \"method\": \"Adipocyte-specific GPS2 knockout mice, HIF1A inhibitor treatment, genetic HIF1A deletion, transcriptome analysis, mitochondrial function assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — adipocyte-specific KO with epistasis confirmation by pharmacological and genetic HIF1A inhibition, multiple orthogonal methods\",\n      \"pmids\": [\"30208320\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GPS2, as a subunit of the NCOR-HDAC3 complex, acts as a direct repressor of PPARα in hepatocytes. Hepatocyte-specific Gps2 knockout alleviates diet-induced steatosis and fibrosis and causes activation of lipid catabolic genes through PPARα de-repression.\",\n      \"method\": \"Hepatocyte-specific Gps2 knockout mice, integrative cistrome/epigenome/transcriptome analysis, ChIP-seq, diet-induced NASH model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific knockout with genome-wide cistrome and epigenome integration, validated with human patient data\",\n      \"pmids\": [\"30975991\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"GPS2 interacts with erythroid transcription factor EKLF and prevents proteasome-mediated degradation of EKLF, thereby increasing EKLF stability and transcriptional activity. The amino acids 191-230 region of EKLF mediates GPS2 binding and is essential for EKLF stability. GPS2 knockout mice show impaired erythropoiesis and severe anemia.\",\n      \"method\": \"Co-immunoprecipitation, proteasome inhibitor assay, domain mapping by deletion mutagenesis, GPS2 knockout mice, xenotransplantation of human CD34+ cells, flow cytometry\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP with domain mapping, in vivo GPS2 knockout phenotype, and xenograft validation; multiple orthogonal methods\",\n      \"pmids\": [\"32384137\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"GPS2 and SMRT corepressors co-occupy candidate enhancers with coactivators CBP and MED1 but antagonistically repress eRNA transcription-coupled H3K27 acetylation. Corepressor depletion or inflammatory signaling similarly triggers enhancer activation. The GPS2/SMRT corepressor complex controls Ccl2 transcription by repressing eRNA at enhancer elements.\",\n      \"method\": \"ChIP-seq, ATAC-seq, genome editing (CRISPR), transcriptional interference, 4C-seq, eRNA analysis, ob/ob mouse adipose tissue macrophage experiments\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide profiling combined with CRISPR editing, 3D chromatin analysis, and in vivo mouse validation; multiple orthogonal methods\",\n      \"pmids\": [\"33503407\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"GPS2 directly interacts with influenza A virus NEP protein (confirmed by GST-pulldown and co-IP). GPS2 inhibits viral RNA synthesis by reducing IAV polymerase (PB1-PB2) interaction and vRNP assembly. NEP mediates nuclear export of GPS2 and promotes its degradation, thereby overcoming GPS2-mediated inhibition of viral replication.\",\n      \"method\": \"Yeast two-hybrid, GST-pulldown, co-immunoprecipitation, GPS2 knockdown/knockout/overexpression, viral titer measurement, viral RNA synthesis assay\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple binding validation methods plus functional viral replication assays, single lab\",\n      \"pmids\": [\"33658351\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"GPS2 directly interacts with HCV NS5A protein (domain I of NS5A and the coiled-coil domain of GPS2 mediate the interaction) and is required for NS5A association with the proviral host factor VAP-A. Knockdown of GPS2 suppresses HCV RNA replication, rescued by RNAi-resistant GPS2 re-expression.\",\n      \"method\": \"Co-immunoprecipitation in mammalian cells, mutagenesis, RNAi knockdown with rescue experiment, HCV RNA replication assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mapping by mutagenesis, RNAi with rescue for specificity, functional replication assay, single lab\",\n      \"pmids\": [\"24223774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"GPS2 represses IL4-dependent enhancer activation in macrophages by cooperating with SMRT and NCOR to antagonize the lysine demethylase KDM1A (LSD1). Corepressor depletion increases KDM1A recruitment to enhancers, causing demethylation of repressive H3K9me2/3 marks and enhancer/gene activation independent of IL4/STAT6.\",\n      \"method\": \"Genome-wide ChIP-seq, ATAC-seq, ChIP for histone marks, RNAi knockdown, co-immunoprecipitation, macrophage IL4 stimulation assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide mechanistic analysis with multiple histone mark readouts, validated in two macrophage models, defines molecular epistasis\",\n      \"pmids\": [\"36610795\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"GPS2 inhibits K63 ubiquitination of RNA-binding and translation proteins (including PABPC1, RPS1, RACK1, eIF3M) on the outer mitochondrial membrane via Ubc13 inhibition. Removal of GPS2-mediated inhibition (by genetic deletion or stress-induced nuclear translocation) promotes import-coupled translation of nuclear-encoded mitochondrial proteins and increases expression of an adaptive antioxidant program.\",\n      \"method\": \"K63 ubiquitome profiling (mass spectrometry), GPS2 knockout cells, nuclear translocation assay, mitochondrial translation assay, protein interaction validation\",\n      \"journal\": \"Pharmacological research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteome-scale ubiquitome mapping with selected target validation, GPS2 KO functional readouts, single lab\",\n      \"pmids\": [\"39094987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"GPS2 promotes erythroid differentiation in K562 cells primarily via NCOR1; GPS2 lacking the NCOR1-binding domain fails to promote differentiation, and NCOR1 knockdown abolishes GPS2's promotive effect on hemoglobin synthesis.\",\n      \"method\": \"GPS2 overexpression/knockdown, domain deletion mutants, NCOR1 knockdown, hemin/Ara-C induced differentiation assay, benzidine staining, globin gene expression\",\n      \"journal\": \"International journal of hematology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis by domain deletion and NCOR1 knockdown, functional differentiation readouts, single lab\",\n      \"pmids\": [\"38814500\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"GPS2 binds the NZF domain of HOIP (catalytic subunit of LUBAC) and inhibits K48-linked polyubiquitination of HOIP at K579, K737, and K988, thereby preventing HOIP proteasomal degradation, maintaining LUBAC stability and NF-κB activation. EC-specific GPS2 deletion causes HOIP degradation, reduced TNF-induced NF-κB activation, increased cell-death complex-II formation, and embryonic lethality due to defective vascularization.\",\n      \"method\": \"Co-immunoprecipitation, site-directed mutagenesis of ubiquitination sites, EC-specific GPS2 knockout mice, TNFR1 double-knockout rescue, ubiquitination assay, embryonic vascular analysis\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — mutagenesis of specific ubiquitination sites combined with in vivo genetic rescue (TNFR1 KO) and multiple cellular assays\",\n      \"pmids\": [\"41507360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"GPS2 binds ATF4 and inhibits ubiquitin-proteasome-dependent degradation of ATF4 by impairing the interaction between ATF4 and the E3 ubiquitin ligase BTRC, thereby stabilizing ATF4 and elevating downstream ASNS expression to confer L-asparaginase resistance in ALL cells.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, GPS2 knockdown/overexpression, in vitro ATF4 degradation assay, xenograft mouse model\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ubiquitination assay with in vivo xenograft validation, single lab\",\n      \"pmids\": [\"40693356\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"GPS2 is differentially methylated at arginine within the peptide SQNPRFYHK, and this methylation state is recognized by the immune system; only the monomethylated variant induces T-cell responses. Recombinant GPS2 can be radiolabeled in vitro by arginine methyltransferase activity.\",\n      \"method\": \"2D nano-HPLC/mass spectrometry of HLA peptidomes, ELISpot assay, in vitro radiolabeling with recombinant GPS2\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — novel methylation site identified by MS with in vitro validation, single lab, primarily immunological readout\",\n      \"pmids\": [\"19917673\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"GPS2, as a component of the NCoR complex, mediates the interaction between ANKRD26 and ETV6 in megakaryopoiesis; GPS2 binds both ANKRD26 and ETV6, and ANKRD26 overexpression deregulates ETV6 transcriptional repression through this GPS2-mediated axis.\",\n      \"method\": \"Co-immunoprecipitation, subcellular localization assay, reporter assay, in vitro interaction mapping\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP validated GPS2-ANKRD26 and GPS2-ETV6 interactions with functional transcriptional readout, single lab\",\n      \"pmids\": [\"39791724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SMRT uniquely controls the chromatin binding and nuclear localization of GPS2, NCOR, and HDAC3, acting as the chromatin anchor for the corepressor complex in macrophages.\",\n      \"method\": \"ChIP-seq, ATAC-seq, corepressor depletion (SMRT/NCOR knockdown), transcriptome analysis in RAW264.7 and BMDM cells\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 2 / Weak — genome-wide ChIP-seq with knockdown, preprint not yet peer-reviewed, single lab\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"GPS2 interacts with ANKRD26, and GPS2 (along with DIPA) is normally located in the nucleus but is translocated to the cytoplasm when the C-terminus of ANKRD26 is introduced into cells. GPS2 downregulation increases adipogenesis in 3T3-L1 cells.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, subcellular localization assay, RNAi knockdown, adipogenesis assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — yeast two-hybrid with Co-IP, localization shift assay, functional adipogenesis readout, single lab\",\n      \"pmids\": [\"22666460\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GPS2 is a multifunctional protein that operates both as an integral subunit of the N-CoR/SMRT-HDAC3 nuclear corepressor complex—where it regulates transcription of metabolic, inflammatory, and developmental genes by controlling histone demethylation, corepressor complex stability, and eRNA transcription at enhancers—and as a cytoplasmic inhibitor of the E2 ubiquitin-conjugating enzyme Ubc13, thereby restricting K63-linked non-proteolytic ubiquitination of substrates including RIP1, AKT, and mitochondria-associated translation factors to modulate TNF-α/JNK signaling, insulin signaling, and mitochondrial gene expression; GPS2 also undergoes regulated mitochondria-to-nucleus translocation as a retrograde signaling mechanism, is itself subject to post-translational regulation by SUMOylation (SUMO-1 at K45/K71), arginine methylation (PRMT6), and proteasomal degradation (Siah2, countered by TBL1), and stabilizes partner proteins including EKLF and HOIP by blocking their ubiquitin-mediated degradation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"GPS2 is a dual-function regulator that controls gene expression in the nucleus and ubiquitin-dependent signaling in the cytoplasm. As an integral subunit of the N-CoR/SMRT-HDAC3 nuclear corepressor complex, it interacts cooperatively with TBL1 at the N-CoR repression domain to form a heterotrimeric platform that restrains transcription [#0], and it functions as a stoichiometric corepressor across diverse transcription factors governing bile acid biosynthesis, cholesterol handling, and lipid metabolism [#5, #7]. At enhancers, the GPS2/SMRT complex sets the chromatin state by antagonizing histone demethylases—stabilizing KDM4A/JMJD2 to prime H3K9-demethylated chromatin for PPARγ binding while restraining KDM1A/LSD1 and eRNA-coupled H3K27 acetylation—so that its loss derepresses inflammatory and metabolic gene programs [#12, #23, #26]. Through this corepressor activity GPS2 directly represses PPARα in hepatocytes and constrains the macrophage epigenome during metabolic stress, with cell-type-specific deletion driving inflammation, steatosis, and stress hypersensitivity [#15, #21]. In parallel, GPS2 acts non-transcriptionally as an inhibitor of the E2 enzyme Ubc13, blocking K63-linked ubiquitination of RIP1 and AKT to limit TNF-α/JNK and insulin signaling [#10, #16]; the same activity restricts B-cell signaling and shapes nuclear-encoded mitochondrial gene expression following its regulated mitochondria-to-nucleus translocation upon depolarization [#17, #18]. GPS2 further stabilizes partner proteins by blocking their ubiquitin-mediated degradation, protecting EKLF to sustain erythropoiesis and the LUBAC catalytic subunit HOIP to maintain NF-κB activation and vascular development [#22, #29]. GPS2 is itself controlled post-translationally by SUMO-1 modification at K45/K71, which promotes TBL1 binding and nuclear retention, and by Siah2-mediated degradation that is countered by TBL1 and PRMT6 methylation [#13, #14].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established GPS2 as a structural subunit of a defined transcriptional corepressor complex rather than a free-standing factor, anchoring all subsequent functional studies.\",\n      \"evidence\": \"Co-IP, biochemical reconstitution, and JNK reporter assays mapping GPS2-TBL1-N-CoR-HDAC3 architecture\",\n      \"pmids\": [\"11931768\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve atomic structure of the GPS2-TBL1-N-CoR interface\", \"Mechanism of HDAC3 activation by SANT domain not linked to GPS2 directly\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Early work linked GPS2 to coactivation and tumor suppressor pathways (p300, p53), framing it as a context-dependent transcriptional cofactor before its corepressor identity was consolidated.\",\n      \"evidence\": \"Co-IP, in vitro binding, reporter and cell-cycle/apoptosis assays in U2OS cells\",\n      \"pmids\": [\"10846067\", \"11486030\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Coactivator role not reconciled with later corepressor function\", \"Whether p53/p300 effects are direct or complex-mediated unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined GPS2 as a functional epigenetic regulator at specific metabolic loci, connecting corepressor occupancy to histone H3K9 demethylation and physiologic cholesterol efflux.\",\n      \"evidence\": \"RNAi, ChIP, cholesterol efflux assays, and histone methylation analysis at ABCG1; SMRT complex domain mapping; transrepression studies in LXR/SUMO-1 knockout mice\",\n      \"pmids\": [\"19481530\", \"19858209\", \"20159957\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the recruited demethylase not established at this stage\", \"Direct versus indirect effect on H3K9 marks unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Revealed a wholly separate cytoplasmic function—GPS2 inhibits TRAF2/Ubc13 to restrict K63 ubiquitination of RIP1 and JNK activation—linking GPS2 to inflammation control and insulin sensitivity in vivo.\",\n      \"evidence\": \"In vitro Ubc13 enzymatic assays, ubiquitination assays, aP2-GPS2 transgenic mice, and adipocyte RNAi with inflammatory readouts\",\n      \"pmids\": [\"22424771\", \"23221346\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of Ubc13 inhibition not defined\", \"Nuclear/cytoplasmic pool partitioning not quantified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Mechanistically unified the corepressor and ubiquitin functions by showing GPS2 primes chromatin for PPARγ via ubiquitin-ligase inhibition and demethylase stabilization, and identified SUMOylation as a regulator of GPS2 stability and localization.\",\n      \"evidence\": \"ChIP-seq, ubiquitination assays, and gene expression in adipocytes; in vivo SUMOylation assays with K45R/K71R mutants and fractionation\",\n      \"pmids\": [\"24953653\", \"24943844\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How chromatin priming integrates with the N-CoR complex unclear\", \"SUMO-1 specificity over SUMO-2/3 mechanistically unexplained\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Cell-type-specific knockouts dissected GPS2's tissue roles, demonstrating it controls the macrophage epigenome, restrains AKT via Ubc13, and governs B-cell development and metabolic phenotypes.\",\n      \"evidence\": \"Macrophage-, adipocyte-, and B-cell-specific Gps2 knockout mice with ChIP-seq/ATAC-seq, insulin signaling, and flow cytometry\",\n      \"pmids\": [\"27270589\", \"28123943\", \"28039360\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of nuclear versus cytoplasmic functions per tissue not separated\", \"Whether obesity-with-insulin-sensitivity uncoupling generalizes beyond adipose unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified mitochondria-to-nucleus retrograde signaling as a trigger that converts the cytoplasmic Ubc13-inhibitory function into a nuclear transcriptional response activating mitochondrial genes; placed GPS2 upstream of HIF1A in adipocyte remodeling.\",\n      \"evidence\": \"Live-cell imaging of translocation, ChIP, RNA Pol2 ChIP; adipocyte-specific KO with HIF1A genetic/pharmacologic epistasis\",\n      \"pmids\": [\"29499132\", \"30208320\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular trigger and transport machinery for translocation unknown\", \"Link between HIF1A and the corepressor/Ubc13 activities not defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Extended corepressor function to hepatic disease, showing GPS2 directly represses PPARα and that its loss alleviates steatosis and fibrosis through lipid-catabolic gene de-repression.\",\n      \"evidence\": \"Hepatocyte-specific Gps2 knockout with integrative cistrome/epigenome/transcriptome and diet-induced NASH model\",\n      \"pmids\": [\"30975991\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Therapeutic window of GPS2 inhibition versus inflammatory derepression not addressed\", \"Human relevance limited to correlative data\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated GPS2 stabilizes partner transcription factors against degradation, with EKLF protection required for normal erythropoiesis, revealing a protein-stabilizing arm distinct from corepression.\",\n      \"evidence\": \"Co-IP, proteasome inhibitor and domain-mapping assays, GPS2 knockout mice with anemia, and CD34+ xenotransplantation\",\n      \"pmids\": [\"32384137\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether stabilization depends on Ubc13 inhibition or a distinct mechanism unclear\", \"E3 ligase targeting EKLF not identified\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Resolved how the GPS2/SMRT complex represses enhancers, showing co-occupancy with coactivators but antagonism of eRNA-coupled H3K27 acetylation to control inflammatory gene loci.\",\n      \"evidence\": \"ChIP-seq, ATAC-seq, CRISPR editing, 4C-seq, and eRNA analysis with ob/ob adipose tissue macrophages\",\n      \"pmids\": [\"33503407\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism that toggles complex from repressive to permissive state unresolved\", \"Direct molecular target of eRNA repression not defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified KDM1A/LSD1 antagonism as the demethylase mechanism by which GPS2/SMRT/NCOR keep repressive H3K9me2/3 marks intact at IL4-responsive enhancers, independent of STAT6.\",\n      \"evidence\": \"Genome-wide ChIP-seq, ATAC-seq, histone-mark ChIP, RNAi, and Co-IP across two macrophage models\",\n      \"pmids\": [\"36610795\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How corepressor depletion increases KDM1A recruitment mechanistically unclear\", \"Interplay with the KDM4A-stabilizing activity not reconciled\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Mapped the mitochondrial Ubc13-inhibitory targets at proteome scale, showing GPS2 restrains K63 ubiquitination of outer-membrane translation factors to gate import-coupled translation and an antioxidant program.\",\n      \"evidence\": \"K63 ubiquitome mass spectrometry, GPS2 KO cells, translocation and mitochondrial translation assays\",\n      \"pmids\": [\"39094987\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causality between individual ubiquitination events and translation not fully established\", \"Single-lab proteomic dataset awaits independent validation\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrated GPS2 stabilizes the LUBAC catalytic subunit HOIP by blocking K48 ubiquitination, establishing an essential pro-survival/NF-κB role in endothelial cells and vascular development.\",\n      \"evidence\": \"Co-IP, site-directed mutagenesis of HOIP ubiquitination sites, EC-specific Gps2 KO mice with TNFR1 double-knockout rescue and embryonic vascular analysis\",\n      \"pmids\": [\"41507360\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ligase mediating HOIP K48 ubiquitination not identified\", \"Whether HOIP stabilization is independent of Ubc13 inhibition unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended GPS2's protein-stabilizing and corepressor roles into cancer and hematopoietic contexts, stabilizing ATF4 to drive asparaginase resistance and mediating ANKRD26-ETV6 transcriptional control in megakaryopoiesis.\",\n      \"evidence\": \"Co-IP, ubiquitination/degradation assays, xenograft model (ATF4); Co-IP and reporter assays for ANKRD26-ETV6 axis\",\n      \"pmids\": [\"40693356\", \"39791724\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Generality of ATF4 stabilization across tumor types untested\", \"Mechanism by which GPS2 bridges ANKRD26 and ETV6 not structurally defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How GPS2's nuclear corepressor function, cytoplasmic Ubc13 inhibition, and target-protein stabilization are coordinated, and what governs the partitioning and translocation between these activities, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model integrating the distinct functional modules\", \"Trigger and machinery governing subcellular redistribution not defined\", \"Whether protein-stabilization arm is mechanistically the same as Ubc13 inhibition unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 5, 7, 21, 23]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [10, 16, 29, 14]},\n      {\"term_id\": \"GO:0140313\", \"supporting_discovery_ids\": [22, 29, 30]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 13, 18]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [10, 13, 16]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [18, 27]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 7, 21, 23, 26]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [12, 23, 26]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [10, 16, 29]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [10, 15, 17, 29]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [5, 7, 12, 21]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [14, 22, 29, 30]}\n    ],\n    \"complexes\": [\n      \"N-CoR/SMRT-HDAC3 corepressor complex\",\n      \"LUBAC\"\n    ],\n    \"partners\": [\n      \"NCOR1\",\n      \"SMRT\",\n      \"TBL1\",\n      \"HDAC3\",\n      \"UBE2N\",\n      \"HOIP\",\n      \"EKLF\",\n      \"ATF4\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}