{"gene":"GPSM3","run_date":"2026-06-10T01:55:21","timeline":{"discoveries":[{"year":2008,"finding":"A point mutation (asparagine-to-isoleucine) in the αD-αE loop of the Gαi helical domain selectively abolishes GoLoco motif binding. This GoLoco-insensitivity ('GLi') mutation prevented Gαi1 association with all human GoLoco motif proteins including GPSM3, and abrogated GPSM3 recruitment to the plasma membrane by Gαi subunits. Ectopic expression of wild-type Gαi (but not the GLi mutant) caused exaggerated mitotic spindle rocking in kidney epithelial cells, directly implicating the Gαi·GPSM3 complex in mitotic spindle dynamics.","method":"Rational mutagenesis of Gαi, biochemical binding assays, cell-based plasma membrane recruitment assays, live-cell imaging of mitotic spindle behavior","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct mutagenesis abrogating a specific interaction, multiple orthogonal assays (binding, localization, functional spindle phenotype), rigorous controls showing no other Gαi properties were perturbed","pmids":["18984596"],"is_preprint":false},{"year":2011,"finding":"GPSM3 interacts with Gβ1–Gβ4 subunits independently of Gγ or Gα·GDP subunits. The Gβ-interaction site was mapped to a leucine-rich region N-terminal to GPSM3's first GoLoco motif. The GPSM3–Gβ complex forms at and transits through the Golgi apparatus and also exists as a soluble cytoplasmic complex; endogenously, GPSM3 and Gβ co-localize in THP-1 cells at the plasma membrane and in a juxtanuclear compartment. GPSM3 increases Gβ stability prior to Gβγ dimer formation and associates with chaperones PhLP and CCT7 during Gβ biosynthesis. Both Gβ and Gαi·GDP binding by GPSM3 are required for its inhibition of phospholipase-Cβ activation. GPSM3 is also required for Akt activation in THP-1 cells, a known Gβγ-dependent pathway.","method":"Co-immunoprecipitation, bimolecular fluorescence complementation (BiFC), GST pulldown, domain-deletion mapping, phospholipase-Cβ activity assay, Akt phosphorylation assay, immunofluorescence colocalization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (BiFC, Co-IP, pulldown, functional assays) in a single rigorous study establishing novel Gβ interaction and functional consequences","pmids":["22167191"],"is_preprint":false},{"year":2010,"finding":"The proline-rich N-terminal domain of GPSM3 (G18) functions as a novel G-protein regulatory region distinct from its GoLoco motifs. In the presence of fluoroaluminate (AlF4−), full-length GPSM3 and its isolated N-terminal domain (G18ΔC) bound strongly to activated Gαi and Gαo, whereas the isolated GoLoco region (ΔNG18) did not. The N-terminal region exhibited guanine nucleotide exchange factor (GEF) activity toward Gαi1 (promoting [35S]GTPγS binding), while the GoLoco region acted as a GDP dissociation inhibitor. On Gαo, the N-terminal region inhibited [35S]GTPγS binding. Neither full-length GPSM3 nor any mutant affected the GTPase activity of Gαi1 or Gαo.","method":"In vitro [35S]GTPγS binding assays with purified recombinant proteins, AlF4− activated Gα pull-downs, domain deletion mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with defined recombinant domains and mutagenesis, multiple nucleotide-binding readouts, single laboratory","pmids":["20097748"],"is_preprint":false},{"year":2012,"finding":"GPSM3 subcellular localization is regulated by phosphorylation-dependent interaction with 14-3-3 proteins. A proline-directed serine/threonine kinase phosphorylates GPSM3, creating a mode II consensus 14-3-3 binding site in its N-terminal disordered region. 14-3-3 binding stabilizes GPSM3 from proteasomal degradation. The GPSM3–14-3-3 complex is exclusively cytoplasmic, and both proteins mutually control their exclusion from the nucleus.","method":"In silico binding site prediction, proteomics/mass spectrometry identification of 14-3-3 partners, co-immunoprecipitation, phosphorylation-site mutagenesis, subcellular fractionation, immunofluorescence localization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, mutagenesis of phosphorylation site, localization with functional consequence (stability, nuclear exclusion), multiple orthogonal methods in single study","pmids":["22843681"],"is_preprint":false},{"year":2012,"finding":"GPSM3 deficiency in mice protects against collagen antibody-induced arthritis (CAIA). GPSM3 is expressed at highest levels in mature monocytes. GPSM3-deficient myeloid cells showed reduced migration ex vivo toward CCL2, CX3CL1, and chemerin, and enhanced apoptosis in vitro. Expression of monocyte-representative pro-inflammatory chemokine receptors and cytokines in paws of Gpsm3−/− mice was decreased.","method":"Gpsm3 knockout mice, CAIA disease model (clinical scoring, histopathology), flow cytometry, transwell chemotaxis assay, apoptosis assay, immunoblotting","journal":"Molecular immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean knockout with defined cellular phenotypes across multiple orthogonal assays (in vivo arthritis model, ex vivo chemotaxis, apoptosis, flow cytometry)","pmids":["23280397"],"is_preprint":false},{"year":2014,"finding":"GPSM3 directly interacts with the C-terminal leucine-rich repeat (LRR) domain of NLRP3 and acts as a negative regulator of NLRP3 inflammasome activity. Bone marrow-derived macrophages from Gpsm3−/− mice showed increased NLRP3-dependent IL-1β (but not TNF-α) secretion. Gpsm3-null mice exhibited enhanced serum and peritoneal IL-1β production following Alum-induced peritonitis.","method":"Yeast two-hybrid screen (initial identification), co-immunoprecipitation (GPSM3–NLRP3 LRR domain), Gpsm3 knockout macrophages, ELISA for IL-1β/TNF-α, in vivo Alum peritonitis model","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — domain-level binding mapped by Co-IP, confirmed by two independent loss-of-function systems (BMDM KO and in vivo peritonitis), multiple orthogonal methods","pmids":["25271165"],"is_preprint":false},{"year":2015,"finding":"GPSM3 selectively binds RGS5 (but not other tested RGS proteins) and enhances RGS5-accelerated GTP hydrolysis by Gαi1 in solution-based assays. In membrane-based assays with M2 muscarinic receptor-activated Gαi1, GPSM3 decreased GTP hydrolysis in the presence of RGS4 but not RGS5, indicating that the GPSM3–RGS5 complex maintains enhanced GTPase-accelerating activity under physiological receptor-activation conditions. Both GPSM3 and RGS5 are expressed in primary rat aortic smooth muscle cells.","method":"Co-immunoprecipitation (selectivity screen across RGS proteins), in vitro GTP hydrolysis assay (solution and membrane-based with reconstituted M2 receptor system), immunoblotting of primary cells","journal":"Molecular and cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 1–2 / Weak — in vitro reconstitution with defined components and selectivity controls, but single laboratory and limited replication","pmids":["25842189"],"is_preprint":false},{"year":2016,"finding":"GPSM3 is induced during retinoic acid-driven differentiation of NB4 cells into a neutrophil model. Reducing GPSM3 expression (mimicking the arthritis-protective SNP rs204989 effect) specifically disrupted migration toward leukotriene B4 (LTB4) and interleukin-8 (CXCL8) but not toward formylated peptides (fMLP), indicating chemoattractant-selective signaling dependence on GPSM3 levels in neutrophil-like cells.","method":"Retinoic acid differentiation of NB4 cells, siRNA knockdown of GPSM3, transwell chemotaxis assay toward LTB4, CXCL8, and fMLP","journal":"Genes and immunity","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — clean knockdown with specific chemoattractant-selective phenotype, single laboratory, cell-line model","pmids":["27307211"],"is_preprint":false},{"year":2016,"finding":"GPSM3 SNPs rs204989 and rs204991 (upstream of the transcription start site) reduce GPSM3 transcript abundance in individuals homozygous for the minor allele. In vitro promoter activity studies indicate rs204989 is the primary functional variant. Knockdown of GPSM3 in THP-1 monocytes disrupts migration toward MCP-1 (CCL2).","method":"Human cohort genotyping, GPSM3 transcript quantification by qRT-PCR, in vitro promoter-reporter assays, siRNA knockdown in THP-1 cells, chemotaxis assay","journal":"Genes and immunity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter activity mechanistically links SNP to transcript reduction; knockdown phenotype in cell line confirms functional consequence; multiple orthogonal approaches in single study","pmids":["26821282"],"is_preprint":false},{"year":2017,"finding":"AGS4/GPSM3-null mice exhibit mild but significant neutropenia and leukocytosis. Dendritic cells, T lymphocytes, and neutrophils from AGS4/GPSM3-null mice show significant defects in chemoattractant-directed chemotaxis and ERK activation. In a peritonitis model, AGS4/GPSM3-null neutrophils had dramatically reduced ability to migrate to sites of inflammation. The AGS4–Gαi interaction is regulated in an agonist-dependent, receptor-proximal manner by chemokine receptors.","method":"Gpsm3 knockout mice, complete blood count, in vitro chemotaxis assay (multiple leukocyte types), ERK phosphorylation assay, in vivo peritonitis model","journal":"The Journal of pharmacology and experimental therapeutics","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with well-defined cellular phenotypes across multiple leukocyte types, in vivo validation, receptor-agonist regulation demonstrated","pmids":["28062526"],"is_preprint":false}],"current_model":"GPSM3 (also known as G18/AGS4) is a hematopoietic-restricted regulator of heterotrimeric G-protein signaling that acts through two GoLoco motifs to exert GDP dissociation inhibitor activity on Gαi subunits, through an N-terminal domain that has GEF activity toward Gαi1, through an additional interaction with nascent monomeric Gβ subunits (stabilizing them during biogenesis at the Golgi), and through a phosphorylation-dependent association with 14-3-3 proteins that controls its cytoplasmic retention and stability; at the immune-cell level, GPSM3 is required for chemokine-receptor-dependent chemotaxis and ERK/Akt signaling in monocytes and neutrophils, directly suppresses NLRP3 inflammasome activity by binding its LRR domain, selectively enhances RGS5-mediated GTPase acceleration, and its deficiency protects mice from inflammatory arthritis."},"narrative":{"mechanistic_narrative":"GPSM3 (G18/AGS4) is a regulator of heterotrimeric G-protein signaling that integrates multiple biochemically distinct activities to control chemokine-directed leukocyte responses and innate immune signaling [PMID:20097748, PMID:28062526]. It engages Gαi through two functional modules: tandem GoLoco motifs that act as GDP dissociation inhibitors on Gαi·GDP, and a proline-rich N-terminal domain that binds activated Gα subunits and exhibits guanine nucleotide exchange activity toward Gαi1 [PMID:20097748]. The integrity of the Gαi·GPSM3 interaction is required for recruitment of GPSM3 to the plasma membrane and for normal mitotic spindle dynamics [PMID:18984596]. GPSM3 also binds nascent monomeric Gβ subunits through a leucine-rich region N-terminal to its first GoLoco motif, associating with the chaperones PhLP and CCT7 at the Golgi to stabilize Gβ prior to Gβγ dimer formation; both Gβ and Gαi·GDP binding are required for its inhibition of phospholipase-Cβ and for Akt activation [PMID:22167191]. Phosphorylation of its N-terminal disordered region creates a 14-3-3 binding site that retains GPSM3 in the cytoplasm and protects it from proteasomal degradation [PMID:22843681]. At the cellular level, GPSM3 is required for chemoattractant-directed chemotaxis and ERK activation in monocytes, neutrophils, dendritic cells, and T lymphocytes [PMID:28062526, PMID:23280397], directly suppresses the NLRP3 inflammasome by binding its C-terminal LRR domain to limit IL-1β production [PMID:25271165], and selectively partners with RGS5 to maintain GTPase-accelerating activity on Gαi1 [PMID:25842189]. GPSM3 deficiency protects mice from inflammatory arthritis, and promoter variants that reduce GPSM3 expression impair chemokine-directed migration [PMID:23280397, PMID:26821282].","teleology":[{"year":2008,"claim":"Established that the Gαi·GPSM3 interaction occurs through the canonical GoLoco-binding surface and is functionally consequential, linking the complex to membrane recruitment and mitotic spindle behavior.","evidence":"Rational mutagenesis of the Gαi helical domain (GoLoco-insensitive 'GLi' mutant) with binding, plasma-membrane recruitment, and live-cell spindle imaging in kidney epithelial cells","pmids":["18984596"],"confidence":"High","gaps":["Spindle phenotype shown by ectopic Gαi expression in epithelial cells, not in physiological GPSM3-expressing hematopoietic cells","Did not resolve which GPSM3 module mediates the membrane recruitment"]},{"year":2010,"claim":"Resolved that GPSM3 carries two opposing G-protein regulatory activities — N-terminal GEF activity toward Gαi1 and GoLoco-mediated GDI activity — defining it as a bifunctional regulator rather than a simple GDI.","evidence":"In vitro [35S]GTPγS binding and AlF4- pull-downs with purified recombinant full-length, N-terminal (G18ΔC), and GoLoco-only (ΔNG18) domains","pmids":["20097748"],"confidence":"High","gaps":["Activities measured in vitro with isolated domains; their integration on intact heterotrimers in cells not established","No effect on intrinsic GTPase activity, leaving the cellular consequence of the GEF activity unclear"]},{"year":2011,"claim":"Showed GPSM3 acts beyond Gα by binding free Gβ subunits during biogenesis, assigning it a chaperone-like role in G-protein assembly and linking both Gβ and Gαi binding to downstream PLCβ inhibition and Akt activation.","evidence":"Co-IP, BiFC, GST pulldown, domain mapping, PLCβ and Akt assays, and immunofluorescence colocalization in THP-1 cells","pmids":["22167191"],"confidence":"High","gaps":["The order of binding events relative to PhLP/CCT7 chaperone handoff not fully resolved","Whether Gβ stabilization is rate-limiting for cellular Gβγ output not quantified"]},{"year":2012,"claim":"Defined a post-translational control layer in which phosphorylation-dependent 14-3-3 binding governs GPSM3 cytoplasmic retention and stability, coupling its abundance and localization to kinase signaling.","evidence":"Mass-spectrometry identification of 14-3-3 partners, phosphorylation-site mutagenesis, reciprocal Co-IP, subcellular fractionation, and immunofluorescence","pmids":["22843681"],"confidence":"High","gaps":["The specific proline-directed kinase responsible for the phosphorylation not identified","Physiological stimuli that trigger this regulation in immune cells unknown"]},{"year":2012,"claim":"Connected GPSM3 to organism-level inflammatory disease, showing it is required in monocytes for chemokine-directed migration and survival and that its loss protects against arthritis.","evidence":"Gpsm3 knockout mice in the collagen antibody-induced arthritis model, transwell chemotaxis to CCL2/CX3CL1/chemerin, apoptosis assays, and flow cytometry","pmids":["23280397"],"confidence":"High","gaps":["Did not distinguish which GPSM3 biochemical activity (GDI/GEF/Gβ chaperone) drives the migration defect","Mechanism linking GPSM3 loss to enhanced apoptosis not defined"]},{"year":2014,"claim":"Identified a G-protein-independent function: direct binding to the NLRP3 LRR domain establishes GPSM3 as a negative regulator of inflammasome activity and IL-1β output.","evidence":"Yeast two-hybrid, domain-mapped Co-IP, Gpsm3-null BMDM IL-1β/TNF-α ELISA, and in vivo Alum peritonitis","pmids":["25271165"],"confidence":"High","gaps":["Whether GPSM3-NLRP3 binding affects inflammasome assembly, priming, or activation steps not mechanistically dissected","Relationship between this function and GPSM3's G-protein roles unresolved"]},{"year":2015,"claim":"Demonstrated selective coupling between GPSM3 and a specific RGS protein, showing GPSM3 enhances RGS5-mediated GTPase acceleration on Gαi1 under receptor-activated conditions.","evidence":"Co-IP selectivity screen across RGS proteins and solution/membrane-based GTP hydrolysis assays with a reconstituted M2 receptor system","pmids":["25842189"],"confidence":"Medium","gaps":["Single laboratory with limited replication","Physiological consequence of the GPSM3-RGS5 module in vascular smooth muscle not tested in vivo"]},{"year":2016,"claim":"Linked human GPSM3 promoter variants to reduced transcript levels and showed that this expression reduction impairs chemokine-directed migration, providing a mechanistic basis for the disease-associated allele.","evidence":"Human cohort genotyping, qRT-PCR, promoter-reporter assays, and siRNA knockdown chemotaxis (toward CCL2 in THP-1; toward LTB4/CXCL8 vs fMLP in NB4-derived neutrophils)","pmids":["26821282","27307211"],"confidence":"Medium","gaps":["Chemoattractant selectivity (LTB4/CXCL8 dependent, fMLP independent) not explained at the receptor-signaling level","Knockdown in cell-line models rather than primary human leukocytes"]},{"year":2017,"claim":"Generalized the chemotaxis requirement across leukocyte lineages and established that the GPSM3-Gαi interaction is regulated agonist-dependently at the receptor, with organismal consequences for blood cell counts and inflammation.","evidence":"Gpsm3 knockout mice, complete blood counts, chemotaxis and ERK assays across dendritic cells/T cells/neutrophils, and an in vivo peritonitis migration model","pmids":["28062526"],"confidence":"High","gaps":["The molecular basis of agonist-dependent regulation of the AGS4-Gαi interaction not resolved","Cause of the neutropenia/leukocytosis phenotype not mechanistically traced"]},{"year":null,"claim":"How GPSM3's distinct biochemical modules (GoLoco-GDI, N-terminal GEF, Gβ chaperone, NLRP3 binding, RGS5 enhancement) are coordinated within a single cell to produce chemoattractant-selective signaling and inflammasome control remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model integrating the G-protein and NLRP3 functions","The kinase and stimuli controlling 14-3-3-dependent localization in immune cells unidentified","No structural model of GPSM3 bound to its various partners"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,2,6]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[2]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[2]},{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[1]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1,3]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[1]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,1]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,2,9]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[4,5,9]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[1,3]}],"complexes":[],"partners":["GNAI1","GNB1","NLRP3","RGS5","YWHAB","PDCL","CCT7"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y4H4","full_name":"G-protein-signaling modulator 3","aliases":["Activator of G-protein signaling 4","G18.1b","Protein G18"],"length_aa":160,"mass_kda":17.9,"function":"Interacts with subunit of G(i) alpha proteins and regulates the activation of G(i) alpha proteins","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9Y4H4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/GPSM3","classification":"Not Classified","n_dependent_lines":16,"n_total_lines":1208,"dependency_fraction":0.013245033112582781},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/GPSM3","total_profiled":1310},"omim":[{"mim_id":"618558","title":"G PROTEIN SIGNALING MODULATOR 3; GPSM3","url":"https://www.omim.org/entry/618558"},{"mim_id":"606416","title":"NLR FAMILY, PYRIN DOMAIN-CONTAINING 3; NLRP3","url":"https://www.omim.org/entry/606416"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"bone marrow","ntpm":151.7},{"tissue":"intestine","ntpm":65.3},{"tissue":"lung","ntpm":64.8},{"tissue":"lymphoid tissue","ntpm":234.9}],"url":"https://www.proteinatlas.org/search/GPSM3"},"hgnc":{"alias_symbol":["NG1","G18","G18.1a","G18.1b","G18.2","AGS4"],"prev_symbol":["C6orf9"]},"alphafold":{"accession":"Q9Y4H4","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y4H4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y4H4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y4H4-F1-predicted_aligned_error_v6.png","plddt_mean":71.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GPSM3","jax_strain_url":"https://www.jax.org/strain/search?query=GPSM3"},"sequence":{"accession":"Q9Y4H4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y4H4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y4H4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y4H4"}},"corpus_meta":[{"pmid":"30219724","id":"PMC_30219724","title":"Biofunctionalized two-dimensional Ti3C2 MXenes for ultrasensitive detection of cancer biomarker.","date":"2018","source":"Biosensors & bioelectronics","url":"https://pubmed.ncbi.nlm.nih.gov/30219724","citation_count":186,"is_preprint":false},{"pmid":"19160015","id":"PMC_19160015","title":"The biological role and regulation of versican levels in cancer.","date":"2009","source":"Cancer metastasis reviews","url":"https://pubmed.ncbi.nlm.nih.gov/19160015","citation_count":182,"is_preprint":false},{"pmid":"8228638","id":"PMC_8228638","title":"Lipoprotein lipase in human plasma is mainly inactive and associated with cholesterol-rich lipoproteins.","date":"1993","source":"Journal of lipid research","url":"https://pubmed.ncbi.nlm.nih.gov/8228638","citation_count":124,"is_preprint":false},{"pmid":"11839533","id":"PMC_11839533","title":"Leptin mediates the parathyroid hormone-related protein paracrine stimulation of fetal lung maturation.","date":"2002","source":"American journal of physiology. 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This GoLoco-insensitivity ('GLi') mutation prevented Gαi1 association with all human GoLoco motif proteins including GPSM3, and abrogated GPSM3 recruitment to the plasma membrane by Gαi subunits. Ectopic expression of wild-type Gαi (but not the GLi mutant) caused exaggerated mitotic spindle rocking in kidney epithelial cells, directly implicating the Gαi·GPSM3 complex in mitotic spindle dynamics.\",\n      \"method\": \"Rational mutagenesis of Gαi, biochemical binding assays, cell-based plasma membrane recruitment assays, live-cell imaging of mitotic spindle behavior\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct mutagenesis abrogating a specific interaction, multiple orthogonal assays (binding, localization, functional spindle phenotype), rigorous controls showing no other Gαi properties were perturbed\",\n      \"pmids\": [\"18984596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"GPSM3 interacts with Gβ1–Gβ4 subunits independently of Gγ or Gα·GDP subunits. The Gβ-interaction site was mapped to a leucine-rich region N-terminal to GPSM3's first GoLoco motif. The GPSM3–Gβ complex forms at and transits through the Golgi apparatus and also exists as a soluble cytoplasmic complex; endogenously, GPSM3 and Gβ co-localize in THP-1 cells at the plasma membrane and in a juxtanuclear compartment. GPSM3 increases Gβ stability prior to Gβγ dimer formation and associates with chaperones PhLP and CCT7 during Gβ biosynthesis. Both Gβ and Gαi·GDP binding by GPSM3 are required for its inhibition of phospholipase-Cβ activation. GPSM3 is also required for Akt activation in THP-1 cells, a known Gβγ-dependent pathway.\",\n      \"method\": \"Co-immunoprecipitation, bimolecular fluorescence complementation (BiFC), GST pulldown, domain-deletion mapping, phospholipase-Cβ activity assay, Akt phosphorylation assay, immunofluorescence colocalization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (BiFC, Co-IP, pulldown, functional assays) in a single rigorous study establishing novel Gβ interaction and functional consequences\",\n      \"pmids\": [\"22167191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The proline-rich N-terminal domain of GPSM3 (G18) functions as a novel G-protein regulatory region distinct from its GoLoco motifs. In the presence of fluoroaluminate (AlF4−), full-length GPSM3 and its isolated N-terminal domain (G18ΔC) bound strongly to activated Gαi and Gαo, whereas the isolated GoLoco region (ΔNG18) did not. The N-terminal region exhibited guanine nucleotide exchange factor (GEF) activity toward Gαi1 (promoting [35S]GTPγS binding), while the GoLoco region acted as a GDP dissociation inhibitor. On Gαo, the N-terminal region inhibited [35S]GTPγS binding. Neither full-length GPSM3 nor any mutant affected the GTPase activity of Gαi1 or Gαo.\",\n      \"method\": \"In vitro [35S]GTPγS binding assays with purified recombinant proteins, AlF4− activated Gα pull-downs, domain deletion mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with defined recombinant domains and mutagenesis, multiple nucleotide-binding readouts, single laboratory\",\n      \"pmids\": [\"20097748\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"GPSM3 subcellular localization is regulated by phosphorylation-dependent interaction with 14-3-3 proteins. A proline-directed serine/threonine kinase phosphorylates GPSM3, creating a mode II consensus 14-3-3 binding site in its N-terminal disordered region. 14-3-3 binding stabilizes GPSM3 from proteasomal degradation. The GPSM3–14-3-3 complex is exclusively cytoplasmic, and both proteins mutually control their exclusion from the nucleus.\",\n      \"method\": \"In silico binding site prediction, proteomics/mass spectrometry identification of 14-3-3 partners, co-immunoprecipitation, phosphorylation-site mutagenesis, subcellular fractionation, immunofluorescence localization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, mutagenesis of phosphorylation site, localization with functional consequence (stability, nuclear exclusion), multiple orthogonal methods in single study\",\n      \"pmids\": [\"22843681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"GPSM3 deficiency in mice protects against collagen antibody-induced arthritis (CAIA). GPSM3 is expressed at highest levels in mature monocytes. GPSM3-deficient myeloid cells showed reduced migration ex vivo toward CCL2, CX3CL1, and chemerin, and enhanced apoptosis in vitro. Expression of monocyte-representative pro-inflammatory chemokine receptors and cytokines in paws of Gpsm3−/− mice was decreased.\",\n      \"method\": \"Gpsm3 knockout mice, CAIA disease model (clinical scoring, histopathology), flow cytometry, transwell chemotaxis assay, apoptosis assay, immunoblotting\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean knockout with defined cellular phenotypes across multiple orthogonal assays (in vivo arthritis model, ex vivo chemotaxis, apoptosis, flow cytometry)\",\n      \"pmids\": [\"23280397\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"GPSM3 directly interacts with the C-terminal leucine-rich repeat (LRR) domain of NLRP3 and acts as a negative regulator of NLRP3 inflammasome activity. Bone marrow-derived macrophages from Gpsm3−/− mice showed increased NLRP3-dependent IL-1β (but not TNF-α) secretion. Gpsm3-null mice exhibited enhanced serum and peritoneal IL-1β production following Alum-induced peritonitis.\",\n      \"method\": \"Yeast two-hybrid screen (initial identification), co-immunoprecipitation (GPSM3–NLRP3 LRR domain), Gpsm3 knockout macrophages, ELISA for IL-1β/TNF-α, in vivo Alum peritonitis model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — domain-level binding mapped by Co-IP, confirmed by two independent loss-of-function systems (BMDM KO and in vivo peritonitis), multiple orthogonal methods\",\n      \"pmids\": [\"25271165\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"GPSM3 selectively binds RGS5 (but not other tested RGS proteins) and enhances RGS5-accelerated GTP hydrolysis by Gαi1 in solution-based assays. In membrane-based assays with M2 muscarinic receptor-activated Gαi1, GPSM3 decreased GTP hydrolysis in the presence of RGS4 but not RGS5, indicating that the GPSM3–RGS5 complex maintains enhanced GTPase-accelerating activity under physiological receptor-activation conditions. Both GPSM3 and RGS5 are expressed in primary rat aortic smooth muscle cells.\",\n      \"method\": \"Co-immunoprecipitation (selectivity screen across RGS proteins), in vitro GTP hydrolysis assay (solution and membrane-based with reconstituted M2 receptor system), immunoblotting of primary cells\",\n      \"journal\": \"Molecular and cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Weak — in vitro reconstitution with defined components and selectivity controls, but single laboratory and limited replication\",\n      \"pmids\": [\"25842189\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"GPSM3 is induced during retinoic acid-driven differentiation of NB4 cells into a neutrophil model. Reducing GPSM3 expression (mimicking the arthritis-protective SNP rs204989 effect) specifically disrupted migration toward leukotriene B4 (LTB4) and interleukin-8 (CXCL8) but not toward formylated peptides (fMLP), indicating chemoattractant-selective signaling dependence on GPSM3 levels in neutrophil-like cells.\",\n      \"method\": \"Retinoic acid differentiation of NB4 cells, siRNA knockdown of GPSM3, transwell chemotaxis assay toward LTB4, CXCL8, and fMLP\",\n      \"journal\": \"Genes and immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — clean knockdown with specific chemoattractant-selective phenotype, single laboratory, cell-line model\",\n      \"pmids\": [\"27307211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"GPSM3 SNPs rs204989 and rs204991 (upstream of the transcription start site) reduce GPSM3 transcript abundance in individuals homozygous for the minor allele. In vitro promoter activity studies indicate rs204989 is the primary functional variant. Knockdown of GPSM3 in THP-1 monocytes disrupts migration toward MCP-1 (CCL2).\",\n      \"method\": \"Human cohort genotyping, GPSM3 transcript quantification by qRT-PCR, in vitro promoter-reporter assays, siRNA knockdown in THP-1 cells, chemotaxis assay\",\n      \"journal\": \"Genes and immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter activity mechanistically links SNP to transcript reduction; knockdown phenotype in cell line confirms functional consequence; multiple orthogonal approaches in single study\",\n      \"pmids\": [\"26821282\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"AGS4/GPSM3-null mice exhibit mild but significant neutropenia and leukocytosis. Dendritic cells, T lymphocytes, and neutrophils from AGS4/GPSM3-null mice show significant defects in chemoattractant-directed chemotaxis and ERK activation. In a peritonitis model, AGS4/GPSM3-null neutrophils had dramatically reduced ability to migrate to sites of inflammation. The AGS4–Gαi interaction is regulated in an agonist-dependent, receptor-proximal manner by chemokine receptors.\",\n      \"method\": \"Gpsm3 knockout mice, complete blood count, in vitro chemotaxis assay (multiple leukocyte types), ERK phosphorylation assay, in vivo peritonitis model\",\n      \"journal\": \"The Journal of pharmacology and experimental therapeutics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with well-defined cellular phenotypes across multiple leukocyte types, in vivo validation, receptor-agonist regulation demonstrated\",\n      \"pmids\": [\"28062526\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GPSM3 (also known as G18/AGS4) is a hematopoietic-restricted regulator of heterotrimeric G-protein signaling that acts through two GoLoco motifs to exert GDP dissociation inhibitor activity on Gαi subunits, through an N-terminal domain that has GEF activity toward Gαi1, through an additional interaction with nascent monomeric Gβ subunits (stabilizing them during biogenesis at the Golgi), and through a phosphorylation-dependent association with 14-3-3 proteins that controls its cytoplasmic retention and stability; at the immune-cell level, GPSM3 is required for chemokine-receptor-dependent chemotaxis and ERK/Akt signaling in monocytes and neutrophils, directly suppresses NLRP3 inflammasome activity by binding its LRR domain, selectively enhances RGS5-mediated GTPase acceleration, and its deficiency protects mice from inflammatory arthritis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"GPSM3 (G18/AGS4) is a regulator of heterotrimeric G-protein signaling that integrates multiple biochemically distinct activities to control chemokine-directed leukocyte responses and innate immune signaling [#2, #9]. It engages Gαi through two functional modules: tandem GoLoco motifs that act as GDP dissociation inhibitors on Gαi·GDP, and a proline-rich N-terminal domain that binds activated Gα subunits and exhibits guanine nucleotide exchange activity toward Gαi1 [#2]. The integrity of the Gαi·GPSM3 interaction is required for recruitment of GPSM3 to the plasma membrane and for normal mitotic spindle dynamics [#0]. GPSM3 also binds nascent monomeric Gβ subunits through a leucine-rich region N-terminal to its first GoLoco motif, associating with the chaperones PhLP and CCT7 at the Golgi to stabilize Gβ prior to Gβγ dimer formation; both Gβ and Gαi·GDP binding are required for its inhibition of phospholipase-Cβ and for Akt activation [#1]. Phosphorylation of its N-terminal disordered region creates a 14-3-3 binding site that retains GPSM3 in the cytoplasm and protects it from proteasomal degradation [#3]. At the cellular level, GPSM3 is required for chemoattractant-directed chemotaxis and ERK activation in monocytes, neutrophils, dendritic cells, and T lymphocytes [#9, #4], directly suppresses the NLRP3 inflammasome by binding its C-terminal LRR domain to limit IL-1β production [#5], and selectively partners with RGS5 to maintain GTPase-accelerating activity on Gαi1 [#6]. GPSM3 deficiency protects mice from inflammatory arthritis, and promoter variants that reduce GPSM3 expression impair chemokine-directed migration [#4, #8].\",\n  \"teleology\": [\n    {\n      \"year\": 2008,\n      \"claim\": \"Established that the Gαi·GPSM3 interaction occurs through the canonical GoLoco-binding surface and is functionally consequential, linking the complex to membrane recruitment and mitotic spindle behavior.\",\n      \"evidence\": \"Rational mutagenesis of the Gαi helical domain (GoLoco-insensitive 'GLi' mutant) with binding, plasma-membrane recruitment, and live-cell spindle imaging in kidney epithelial cells\",\n      \"pmids\": [\"18984596\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Spindle phenotype shown by ectopic Gαi expression in epithelial cells, not in physiological GPSM3-expressing hematopoietic cells\", \"Did not resolve which GPSM3 module mediates the membrane recruitment\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Resolved that GPSM3 carries two opposing G-protein regulatory activities — N-terminal GEF activity toward Gαi1 and GoLoco-mediated GDI activity — defining it as a bifunctional regulator rather than a simple GDI.\",\n      \"evidence\": \"In vitro [35S]GTPγS binding and AlF4- pull-downs with purified recombinant full-length, N-terminal (G18ΔC), and GoLoco-only (ΔNG18) domains\",\n      \"pmids\": [\"20097748\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Activities measured in vitro with isolated domains; their integration on intact heterotrimers in cells not established\", \"No effect on intrinsic GTPase activity, leaving the cellular consequence of the GEF activity unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed GPSM3 acts beyond Gα by binding free Gβ subunits during biogenesis, assigning it a chaperone-like role in G-protein assembly and linking both Gβ and Gαi binding to downstream PLCβ inhibition and Akt activation.\",\n      \"evidence\": \"Co-IP, BiFC, GST pulldown, domain mapping, PLCβ and Akt assays, and immunofluorescence colocalization in THP-1 cells\",\n      \"pmids\": [\"22167191\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The order of binding events relative to PhLP/CCT7 chaperone handoff not fully resolved\", \"Whether Gβ stabilization is rate-limiting for cellular Gβγ output not quantified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined a post-translational control layer in which phosphorylation-dependent 14-3-3 binding governs GPSM3 cytoplasmic retention and stability, coupling its abundance and localization to kinase signaling.\",\n      \"evidence\": \"Mass-spectrometry identification of 14-3-3 partners, phosphorylation-site mutagenesis, reciprocal Co-IP, subcellular fractionation, and immunofluorescence\",\n      \"pmids\": [\"22843681\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The specific proline-directed kinase responsible for the phosphorylation not identified\", \"Physiological stimuli that trigger this regulation in immune cells unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Connected GPSM3 to organism-level inflammatory disease, showing it is required in monocytes for chemokine-directed migration and survival and that its loss protects against arthritis.\",\n      \"evidence\": \"Gpsm3 knockout mice in the collagen antibody-induced arthritis model, transwell chemotaxis to CCL2/CX3CL1/chemerin, apoptosis assays, and flow cytometry\",\n      \"pmids\": [\"23280397\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not distinguish which GPSM3 biochemical activity (GDI/GEF/Gβ chaperone) drives the migration defect\", \"Mechanism linking GPSM3 loss to enhanced apoptosis not defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified a G-protein-independent function: direct binding to the NLRP3 LRR domain establishes GPSM3 as a negative regulator of inflammasome activity and IL-1β output.\",\n      \"evidence\": \"Yeast two-hybrid, domain-mapped Co-IP, Gpsm3-null BMDM IL-1β/TNF-α ELISA, and in vivo Alum peritonitis\",\n      \"pmids\": [\"25271165\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether GPSM3-NLRP3 binding affects inflammasome assembly, priming, or activation steps not mechanistically dissected\", \"Relationship between this function and GPSM3's G-protein roles unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrated selective coupling between GPSM3 and a specific RGS protein, showing GPSM3 enhances RGS5-mediated GTPase acceleration on Gαi1 under receptor-activated conditions.\",\n      \"evidence\": \"Co-IP selectivity screen across RGS proteins and solution/membrane-based GTP hydrolysis assays with a reconstituted M2 receptor system\",\n      \"pmids\": [\"25842189\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single laboratory with limited replication\", \"Physiological consequence of the GPSM3-RGS5 module in vascular smooth muscle not tested in vivo\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Linked human GPSM3 promoter variants to reduced transcript levels and showed that this expression reduction impairs chemokine-directed migration, providing a mechanistic basis for the disease-associated allele.\",\n      \"evidence\": \"Human cohort genotyping, qRT-PCR, promoter-reporter assays, and siRNA knockdown chemotaxis (toward CCL2 in THP-1; toward LTB4/CXCL8 vs fMLP in NB4-derived neutrophils)\",\n      \"pmids\": [\"26821282\", \"27307211\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Chemoattractant selectivity (LTB4/CXCL8 dependent, fMLP independent) not explained at the receptor-signaling level\", \"Knockdown in cell-line models rather than primary human leukocytes\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Generalized the chemotaxis requirement across leukocyte lineages and established that the GPSM3-Gαi interaction is regulated agonist-dependently at the receptor, with organismal consequences for blood cell counts and inflammation.\",\n      \"evidence\": \"Gpsm3 knockout mice, complete blood counts, chemotaxis and ERK assays across dendritic cells/T cells/neutrophils, and an in vivo peritonitis migration model\",\n      \"pmids\": [\"28062526\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The molecular basis of agonist-dependent regulation of the AGS4-Gαi interaction not resolved\", \"Cause of the neutropenia/leukocytosis phenotype not mechanistically traced\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How GPSM3's distinct biochemical modules (GoLoco-GDI, N-terminal GEF, Gβ chaperone, NLRP3 binding, RGS5 enhancement) are coordinated within a single cell to produce chemoattractant-selective signaling and inflammasome control remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model integrating the G-protein and NLRP3 functions\", \"The kinase and stimuli controlling 14-3-3-dependent localization in immune cells unidentified\", \"No structural model of GPSM3 bound to its various partners\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 2, 6]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 3]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0007186\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 2, 9]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [4, 5, 9]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [1, 3]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"GNAI1\", \"GNB1\", \"NLRP3\", \"RGS5\", \"YWHAB\", \"PDCL\", \"CCT7\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}