{"gene":"RGS17","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":2004,"finding":"RGS17 (RGSZ2) acts as a GTPase-activating protein (GAP) for Gαi1-3, Gαo, and Gαz subunits, and interacts with active forms of Gαi1-3, Gαo, Gαz, and Gαq but not Gαs. RGS17 exhibits limited selectivity for Gαo among Gi/Go proteins, unlike the highly Gz-selective RGSZ1. In cellular assays, RGS17 reduced dopamine-D2/Gαi-mediated inhibition of cAMP formation and abolished TRH receptor/Gαq-mediated calcium mobilization.","method":"Yeast two-hybrid screening, in vitro pull-down assay, co-immunoprecipitation, pre-steady-state and steady-state GTPase assays, cell-based cAMP and calcium signaling assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods (reconstitution in vitro GAP assay, yeast two-hybrid, pulldown, Co-IP, functional cell assays) in a single rigorous study","pmids":["15096504"],"is_preprint":false},{"year":2005,"finding":"RGSZ2 (RGS17) co-precipitates with mu-opioid receptors (MORs) and Gαz (but not other Gα subunits) in periaqueductal gray matter membranes. Morphine challenge increases RGSZ2 association with MORs while Gi/o/z subunits dissociate from MORs. RGSZ2 influences MOR signaling by sequestering Gα subunits, functioning as an effector antagonist. Knockdown of RGSZ2 augmented antinociceptive responses to morphine and DAMGO via mu-opioid receptors.","method":"Co-immunoprecipitation from brain membrane fractions, in vivo siRNA knockdown with behavioral antinociception assay, Western blot","journal":"Neuropsychopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and in vivo knockdown with defined phenotypic readout, single lab, two orthogonal methods","pmids":["15827571"],"is_preprint":false},{"year":2007,"finding":"Morphine induces long-lasting transfer of MOR-activated Gα subunits to RGSZ2 proteins in neurons, causing sustained sequestration that reduces receptor responsiveness and precedes MOR phosphorylation and internalization. This Gα sequestration by RGSZ2 is associated with increased free Gβγ, GRK-mediated phosphorylation, and MOR endocytosis.","method":"In vivo intracerebroventricular drug administration, co-immunoprecipitation from brain tissue, Western blot, behavioral antinociception assay","journal":"Molecular pain","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP from native brain tissue combined with behavioral functional readout, single lab","pmids":["17634133"],"is_preprint":false},{"year":2008,"finding":"RGSZ2 (RGS17) is part of a complex at the C-terminus of the mu-opioid receptor (MOR) with HINT1/PKCI. Morphine-activated NMDAR/nNOS cascade generates free zinc ions that recruit inactive PKCγ to the MOR via the HINT1/RGSZ complex through PKC C1 cysteine-rich domains. PKCγ then phosphorylates the MOR to reduce signal strength.","method":"Intracerebroventricular drug administration in vivo, co-immunoprecipitation, HINT1 knockdown, pharmacological inhibitors of NMDAR (MK801), NOS (SNAP/TPEN), phorbol esters, Western blot","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple pharmacological and genetic interventions with Co-IP in vivo, single lab, multiple orthogonal approaches","pmids":["18652891"],"is_preprint":false},{"year":2009,"finding":"RGS17 promotes tumor cell proliferation through the cAMP-PKA-CREB pathway: RGS17 increases cAMP levels, enhances forskolin-mediated cAMP production, promotes CREB phosphorylation, and enhances CREB-responsive gene expression. Inhibition of cAMP-dependent kinase (PKA) prevents tumor cell proliferation, which is partially rescued by RGS17 overexpression.","method":"siRNA knockdown and overexpression in tumor cells, exon microarray and transcript analysis, cAMP measurement assays, forskolin stimulation, PKA inhibition, colony formation, xenograft in nude mice","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss- and gain-of-function with multiple functional readouts and pharmacological epistasis, single lab","pmids":["19244110"],"is_preprint":false},{"year":2011,"finding":"RGSZ2 binds to the PDZ domain of neural nitric oxide synthase (nNOS) via PDZ-binding motifs upstream of and within the RGSZ2 RGS box, negatively regulating nNOS activity. In RGSZ2-deficient mice, morphine over-stimulates the nNOS/NO/NMDAR/CaMKII pathway, causing rapid analgesic tolerance. Recovery of RGSZ2 levels or inhibition of nNOS, PKC, NMDAR, or CaMKII restored MOR signaling.","method":"RGSZ2 knockout/knockdown mice, intracerebroventricular drug administration, behavioral antinociception assay, pharmacological inhibition of nNOS/NMDAR/CaMKII/PKC, co-immunoprecipitation, Western blot","journal":"Antioxidants & redox signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout with defined behavioral phenotype and pharmacological rescue experiments, single lab","pmids":["21348811"],"is_preprint":false},{"year":2011,"finding":"RGSZ2 undergoes covalent SUMOylation within its RGS box (RH domain), which abolishes GAP activity without affecting binding to GPCR-activated GαGTP subunits. Non-covalent SUMO binding to SUMO-interacting motifs (SIMs) within the RH domain blocks RGSZ2 from interacting with GαGTP subunits. A third SIM upstream of the RH domain can mediate regulatory interactions with sumoylated proteins without affecting GαGTP binding or GAP activity.","method":"SUMOylation assays, mutagenesis of RGS box and SIM motifs, in vitro GAP assays, GαGTP binding assays, immunoprecipitation","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro GAP assay with mutagenesis and multiple binding assays, single lab","pmids":["22163035"],"is_preprint":false},{"year":2011,"finding":"RGS17 associates with both Giα and Gqα subunits in hepatocellular carcinoma (HCC) cells. Altering RGS17 expression profoundly affected HCC cell mitogenesis and migration. RGS17 protein levels are governed by protein degradation rather than by miRNAs in HCC cells.","method":"Co-immunoprecipitation in human and rat HCC cells, siRNA knockdown and overexpression, cell proliferation and migration assays, miRNA inhibition experiments","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for Gα interaction, loss/gain of function, single lab with two orthogonal methods","pmids":["21620966"],"is_preprint":false},{"year":2012,"finding":"RGSZ2 functions as a redox zinc switch in neurons: agonist activation of a broad panel of GPCRs stimulates the RGSZ2-nNOS complex to produce NO, which releases zinc ions from the RGSZ2 zinc finger in a nNOS/NO-dependent mechanism, subsequently recruiting PKCγ and Raf-1 to the C-terminus or third internal loop of the activated GPCR.","method":"Co-immunoprecipitation of RGSZ2-nNOS-GPCR complexes, zinc chelation (TPEN), NOS inhibition, pharmacological activation of multiple GPCRs, Western blot","journal":"Antioxidants & redox signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP across multiple GPCR systems with pharmacological validation, single lab","pmids":["22563771"],"is_preprint":false},{"year":2010,"finding":"RGS17 knockdown significantly reduces chemotherapy-induced cell toxicity (cisplatin, vincristine, docetaxel) in ovarian cancer cells. RGS17 overexpression blocked LPA-mediated AKT activation, suggesting RGS17 blunts AKT survival signaling. Loss of RGS17 expression contributes to chemoresistance through amplification of AKT signals.","method":"siRNA knockdown, RGS17 overexpression, cell viability assays, phosphatidylserine externalization (apoptosis) assay, AKT phosphorylation by Western blot in SKOV-3 and MDR-HeyA8 cells","journal":"Molecular cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss- and gain-of-function with defined mechanistic readout (AKT activation), two cell line models, single lab","pmids":["21044322"],"is_preprint":false},{"year":2019,"finding":"Crystal structure of RGS17 at 1.5-Å resolution reveals Ca2+ bound to conserved positions on the predicted Gα-binding surface. NMR chemical shift perturbations confirmed Ca2+ binds the same site in solution. RGS17 has >55-fold higher affinity for Ca2+ than Mg2+. Ca2+ promotes RGS17 interaction with activated Gα and decreases the Km for GTP hydrolysis, suggesting Ca2+ positively regulates RGS17 GAP activity.","method":"X-ray crystallography (1.5-Å), NMR chemical shift perturbation assay, binding affinity measurements (Ca2+ vs Mg2+), in vitro GTPase assay with Ca2+","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with NMR validation, quantitative binding assay, and functional GTPase assay, multiple orthogonal methods in single study","pmids":["30940727"],"is_preprint":false},{"year":2017,"finding":"Natural product inhibitors of RGS17 (sanguinarine and celastrol) bind RGS17 through a cysteine-dependent mechanism, verified by site-directed mutagenesis and cysteine reactivity assessment. These compounds inhibit the RGS17-Gαo protein-protein interaction with IC50 values in high nanomolar to low micromolar range, with dissociation constants confirmed by ITC.","method":"High-throughput AlphaScreen assay, site-directed mutagenesis, isothermal titration calorimetry (ITC), mass spectrometry, Western blot, confocal microscopy, cytotoxicity assays","journal":"Journal of natural products","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — mutagenesis confirming cysteine-dependent binding mechanism with ITC and biochemical validation, single lab","pmids":["28621943"],"is_preprint":false},{"year":2011,"finding":"The RGS17-Gαo protein-protein interaction was reconstituted and quantified using AlphaScreen technology, enabling high-throughput screening. Small-molecule inhibitors of the Gαo-RGS17 interaction were identified with IC50 values <10 µM.","method":"AlphaScreen protein-protein interaction assay, high-throughput screening of NCI Diversity Set II, dose-response IC50 determination","journal":"Journal of biomolecular screening","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro reconstitution of the RGS17-Gαo interaction with quantitative readout, single lab, single method","pmids":["21680864"],"is_preprint":false},{"year":2025,"finding":"RGS17 knockout in cochlear hair cells protects against cisplatin-induced outer hair cell loss, elevation of auditory brainstem response thresholds, cochlear inflammation (reduced CXCL1, CD45+, and CD68+ immune cells), and inner hair cell synaptopathy, placing RGS17 upstream of the inflammatory immune cascade in cisplatin ototoxicity.","method":"Hair-cell-specific RGS17 knockout mice, cisplatin treatment protocol, auditory brainstem response (ABR) threshold measurement, immunohistochemistry for CXCL1/CD45/CD68, hair cell counting","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — cell-type-specific genetic knockout with multiple defined phenotypic readouts, single lab, single study","pmids":["40061942"],"is_preprint":false},{"year":2025,"finding":"Tumor-secreted RGS17 impairs CD8+ T cell cytotoxicity in lung adenocarcinoma by reducing IFN-γ and Granzyme B secretion and inhibiting glycolysis (reduced glucose consumption, lactate production, and ECAR) via the PI3K/AKT pathway. RGS17 knockdown in tumor cells increased CD8+ T cell tumor infiltration.","method":"RGS17 knockdown in tumor cells, conditioned media transfer to CD8+ T cells, flow cytometry for T cell function (IFN-γ/Granzyme B), glycolysis measurement (ECAR, glucose consumption, lactate production), Western blot for PI3K/AKT pathway components","journal":"Discover oncology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, mechanistic pathway inferred from knockdown and pathway readouts without direct reconstitution or epistasis confirmation","pmids":["40627213"],"is_preprint":false}],"current_model":"RGS17 (RGSZ2) is a member of the RZ/A subfamily of RGS proteins that acts as a GTPase-activating protein (GAP) for Gαi1-3, Gαo, Gαz, and Gαq subunits; its GAP activity is positively regulated by Ca2+ binding to the Gα-binding surface (established by crystal structure and NMR), negatively regulated by SUMOylation (which abolishes GAP activity) and SUMO-SIM interactions (which block GαGTP binding), and it operates at the C-terminus of mu-opioid and other GPCRs as part of a complex with HINT1 and nNOS, where it sequesters activated Gα subunits, releases zinc via a redox/nNOS/NO mechanism to recruit PKCγ and Raf-1, and restrains nNOS-NMDAR-CaMKII signaling; in cancer contexts, RGS17 promotes tumor cell proliferation through the cAMP-PKA-CREB axis and modulates AKT survival signaling, while also impairing anti-tumor CD8+ T cell glycolysis via PI3K/AKT."},"narrative":{"mechanistic_narrative":"RGS17 (RGSZ2) is a GTPase-activating protein (GAP) that accelerates GTP hydrolysis on activated Gαi1-3, Gαo, and Gαz subunits and binds active Gαq, but not Gαs, thereby terminating G protein signaling downstream of dopamine-D2/Gαi and TRH/Gαq receptors [PMID:15096504]. Its GAP activity is positively regulated by Ca2+ binding to conserved positions on the Gα-binding surface, which promotes Gα interaction and lowers the Km for GTP hydrolysis [PMID:30940727], and is negatively regulated by covalent SUMOylation within the RGS box (which abolishes GAP activity) and by non-covalent SUMO–SIM interactions (which block Gα-GTP binding) [PMID:22163035]. At the C-terminus of mu-opioid and other GPCRs, RGS17 acts as an effector antagonist that sequesters morphine-activated Gα subunits to dampen receptor responsiveness, operating within a HINT1/PKCγ complex in which an nNOS/NO-dependent redox zinc switch releases zinc from the RGSZ2 zinc finger to recruit PKCγ and Raf-1 [PMID:15827571, PMID:18652891, PMID:22563771], while RGS17 binding to the nNOS PDZ domain restrains the nNOS/NO/NMDAR/CaMKII pathway and prevents morphine analgesic tolerance [PMID:21348811]. In cancer, RGS17 drives tumor cell proliferation through a cAMP-PKA-CREB axis [PMID:19244110] and is targetable through its Gαo interaction surface by cysteine-reactive small-molecule inhibitors [PMID:28621943, PMID:21680864].","teleology":[{"year":2004,"claim":"Established RGS17's core biochemical identity as a GAP with defined Gα selectivity, answering which heterotrimeric G proteins it regulates and how it shapes receptor signaling.","evidence":"Yeast two-hybrid, in vitro GAP assays, and cell-based cAMP/calcium signaling readouts","pmids":["15096504"],"confidence":"High","gaps":["Did not resolve subcellular targeting or receptor-specific recruitment","No structural basis for Gα selectivity"]},{"year":2005,"claim":"Showed RGS17 functions as an effector antagonist at mu-opioid receptors by sequestering activated Gα, linking its GAP biochemistry to opioid antinociception in vivo.","evidence":"Co-IP from brain membranes and in vivo siRNA knockdown with antinociception behavior","pmids":["15827571"],"confidence":"Medium","gaps":["Mechanism of sustained sequestration not defined","Single lab"]},{"year":2007,"claim":"Defined the temporal order of RGS17 action, showing Gα sequestration precedes MOR phosphorylation and internalization during morphine adaptation.","evidence":"In vivo icv administration, Co-IP from brain tissue, behavioral assay","pmids":["17634133"],"confidence":"Medium","gaps":["Causal link to GRK recruitment correlative","Single lab"]},{"year":2008,"claim":"Placed RGS17 in a HINT1/PKCγ signaling complex and identified a zinc-dependent recruitment mechanism for PKCγ to the MOR.","evidence":"In vivo pharmacology (NMDAR/NOS inhibitors, zinc chelators), Co-IP, HINT1 knockdown","pmids":["18652891"],"confidence":"Medium","gaps":["Stoichiometry and direct vs indirect binding within complex unresolved","Single lab"]},{"year":2009,"claim":"Identified an oncogenic role for RGS17 via the cAMP-PKA-CREB axis, distinct from its GAP-mediated signal termination.","evidence":"siRNA/overexpression in tumor cells, cAMP assays, PKA inhibition epistasis, xenografts","pmids":["19244110"],"confidence":"Medium","gaps":["How a Gαi GAP raises cAMP not mechanistically reconciled","Single lab"]},{"year":2010,"claim":"Linked RGS17 to chemosensitivity by showing it blunts LPA-driven AKT survival signaling in ovarian cancer.","evidence":"siRNA knockdown/overexpression, viability and apoptosis assays, AKT phosphorylation in two cell lines","pmids":["21044322"],"confidence":"Medium","gaps":["Direct connection between GAP activity and AKT modulation not established","Single lab"]},{"year":2011,"claim":"Resolved how RGS17 restrains nNOS, defining a PDZ-mediated interaction that prevents morphine analgesic tolerance.","evidence":"RGSZ2 knockout/knockdown mice, behavioral assays, pharmacological rescue, Co-IP","pmids":["21348811"],"confidence":"Medium","gaps":["Direct PDZ binding affinity not quantified","Single lab"]},{"year":2011,"claim":"Uncovered SUMOylation and SUMO-SIM interactions as on/off switches for RGS17 GAP activity and Gα binding.","evidence":"SUMOylation assays, RGS-box/SIM mutagenesis, in vitro GAP and Gα-GTP binding assays","pmids":["22163035"],"confidence":"Medium","gaps":["In vivo prevalence of SUMOylated RGS17 unknown","SUMO ligase machinery not identified"]},{"year":2011,"claim":"Connected RGS17 to dual Giα/Gqα engagement in hepatocellular carcinoma and showed its abundance is set by protein degradation.","evidence":"Co-IP, knockdown/overexpression with proliferation/migration assays, miRNA inhibition","pmids":["21620966"],"confidence":"Medium","gaps":["Degradation pathway/E3 ligase not identified","Single lab"]},{"year":2011,"claim":"Reconstituted the RGS17-Gαo interaction in a high-throughput format, enabling small-molecule inhibitor discovery against an oncogenic target.","evidence":"AlphaScreen protein-protein interaction assay, HTS, IC50 determination","pmids":["21680864"],"confidence":"Medium","gaps":["Cellular efficacy of hits not shown","Single in vitro method"]},{"year":2012,"claim":"Generalized the RGSZ2 redox zinc switch beyond opioids, showing diverse GPCRs trigger nNOS/NO-dependent zinc release that recruits PKCγ and Raf-1.","evidence":"Co-IP across multiple GPCR systems with zinc chelation and NOS inhibition","pmids":["22563771"],"confidence":"Medium","gaps":["Identity of the relevant zinc finger residues not pinpointed","Single lab"]},{"year":2017,"claim":"Defined a cysteine-dependent inhibitor binding mechanism, providing a chemical strategy to disrupt the RGS17-Gαo interaction.","evidence":"AlphaScreen, site-directed mutagenesis, ITC, mass spectrometry","pmids":["28621943"],"confidence":"Medium","gaps":["Cysteine reactivity raises selectivity concerns","Single lab"]},{"year":2019,"claim":"Provided a structural basis for Ca2+ as a positive regulator of GAP activity, refining how RGS17 catalysis is tuned by divalent cations.","evidence":"1.5-Å crystal structure, NMR chemical shift perturbation, binding affinity and GTPase assays","pmids":["30940727"],"confidence":"High","gaps":["Physiological Ca2+ concentration dependence in cells not tested","Interplay with SUMO regulation unaddressed"]},{"year":2025,"claim":"Placed RGS17 upstream of the inflammatory immune cascade in cisplatin ototoxicity using hair-cell-specific knockout.","evidence":"Hair-cell-specific RGS17 knockout mice, cisplatin, ABR thresholds, immunohistochemistry","pmids":["40061942"],"confidence":"Medium","gaps":["Downstream signaling linking RGS17 to inflammation not defined","Single lab"]},{"year":2025,"claim":"Suggested tumor-secreted RGS17 suppresses CD8+ T cell glycolysis and cytotoxicity via PI3K/AKT, extending its oncogenic role to immune evasion.","evidence":"Tumor knockdown, conditioned media transfer, T cell function/glycolysis assays, PI3K/AKT Western blot","pmids":["40627213"],"confidence":"Low","gaps":["Mechanism inferred without reconstitution or epistasis confirmation","How an intracellular GAP acts as a secreted factor unexplained","Single lab"]},{"year":null,"claim":"How RGS17's biochemical GAP activity is mechanistically reconciled with its opposing roles in cAMP-PKA-CREB proliferation, AKT modulation, and immune evasion remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No unifying model linking GAP activity to downstream cAMP/AKT phenotypes","Regulatory crosstalk between Ca2+, SUMO, and zinc-switch states untested in vivo","Endogenous degradation machinery controlling RGS17 abundance unidentified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,6,10]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,5]},{"term_id":"GO:0140313","term_label":"molecular sequestering activity","supporting_discovery_ids":[1,2]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,3,8]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,4]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[3,5,8]}],"complexes":["RGSZ2-HINT1-nNOS complex at mu-opioid receptor C-terminus"],"partners":["GNAO1","GNAZ","GNAI1","GNAQ","OPRM1","HINT1","NOS1","PRKCG"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9UGC6","full_name":"Regulator of G-protein signaling 17","aliases":[],"length_aa":210,"mass_kda":24.4,"function":"Regulates G protein-coupled receptor signaling cascades, including signaling via muscarinic acetylcholine receptor CHRM2 and dopamine receptor DRD2. Inhibits signal transduction by increasing the GTPase activity of G protein alpha subunits, thereby driving them into their inactive GDP-bound form (PubMed:15096504). Binds selectively to GNAZ and GNAI2 subunits, accelerates their GTPase activity and regulates their signaling activities. Negatively regulates mu-opioid receptor-mediated activation of the G-proteins (By similarity)","subcellular_location":"Membrane; Synapse, synaptosome; Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9UGC6/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RGS17","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RGS17","total_profiled":1310},"omim":[{"mim_id":"607191","title":"REGULATOR OF G PROTEIN SIGNALING 17; RGS17","url":"https://www.omim.org/entry/607191"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"brain","ntpm":4.0}],"url":"https://www.proteinatlas.org/search/RGS17"},"hgnc":{"alias_symbol":["RGSZ2","RGS-17"],"prev_symbol":[]},"alphafold":{"accession":"Q9UGC6","domains":[{"cath_id":"1.10.167.10","chopping":"74-206","consensus_level":"medium","plddt":95.9737,"start":74,"end":206}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UGC6","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UGC6-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UGC6-F1-predicted_aligned_error_v6.png","plddt_mean":78.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RGS17","jax_strain_url":"https://www.jax.org/strain/search?query=RGS17"},"sequence":{"accession":"Q9UGC6","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UGC6.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UGC6/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UGC6"}},"corpus_meta":[{"pmid":"20420807","id":"PMC_20420807","title":"Hsa-mir-182 suppresses lung tumorigenesis through down regulation of RGS17 expression in vitro.","date":"2010","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/20420807","citation_count":95,"is_preprint":false},{"pmid":"19244110","id":"PMC_19244110","title":"RGS17, an overexpressed gene in human lung and prostate cancer, induces tumor cell proliferation through the cyclic AMP-PKA-CREB pathway.","date":"2009","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/19244110","citation_count":88,"is_preprint":false},{"pmid":"15096504","id":"PMC_15096504","title":"RGS17/RGSZ2, a novel regulator of Gi/o, Gz, and Gq signaling.","date":"2004","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15096504","citation_count":72,"is_preprint":false},{"pmid":"21044322","id":"PMC_21044322","title":"Regulators of G-Protein signaling RGS10 and RGS17 regulate chemoresistance in ovarian cancer 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chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/30940727","citation_count":4,"is_preprint":false},{"pmid":"35041543","id":"PMC_35041543","title":"Circ_0006220 promotes non-small cell lung cancer progression via sponging miR-203-3p and regulating RGS17 expression.","date":"2022","source":"Human & experimental toxicology","url":"https://pubmed.ncbi.nlm.nih.gov/35041543","citation_count":3,"is_preprint":false},{"pmid":"29351497","id":"PMC_29351497","title":"Screen Targeting Lung and Prostate Cancer Oncogene Identifies Novel Inhibitors of RGS17 and Problematic Chemical Substructures.","date":"2018","source":"SLAS discovery : advancing life sciences R & D","url":"https://pubmed.ncbi.nlm.nih.gov/29351497","citation_count":2,"is_preprint":false},{"pmid":"40061942","id":"PMC_40061942","title":"Role of RGS17 in cisplatin-induced cochlear inflammation and ototoxicity via caspase-3 activation.","date":"2025","source":"Frontiers in 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RGS17 exhibits limited selectivity for Gαo among Gi/Go proteins, unlike the highly Gz-selective RGSZ1. In cellular assays, RGS17 reduced dopamine-D2/Gαi-mediated inhibition of cAMP formation and abolished TRH receptor/Gαq-mediated calcium mobilization.\",\n      \"method\": \"Yeast two-hybrid screening, in vitro pull-down assay, co-immunoprecipitation, pre-steady-state and steady-state GTPase assays, cell-based cAMP and calcium signaling assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods (reconstitution in vitro GAP assay, yeast two-hybrid, pulldown, Co-IP, functional cell assays) in a single rigorous study\",\n      \"pmids\": [\"15096504\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"RGSZ2 (RGS17) co-precipitates with mu-opioid receptors (MORs) and Gαz (but not other Gα subunits) in periaqueductal gray matter membranes. Morphine challenge increases RGSZ2 association with MORs while Gi/o/z subunits dissociate from MORs. RGSZ2 influences MOR signaling by sequestering Gα subunits, functioning as an effector antagonist. Knockdown of RGSZ2 augmented antinociceptive responses to morphine and DAMGO via mu-opioid receptors.\",\n      \"method\": \"Co-immunoprecipitation from brain membrane fractions, in vivo siRNA knockdown with behavioral antinociception assay, Western blot\",\n      \"journal\": \"Neuropsychopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and in vivo knockdown with defined phenotypic readout, single lab, two orthogonal methods\",\n      \"pmids\": [\"15827571\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Morphine induces long-lasting transfer of MOR-activated Gα subunits to RGSZ2 proteins in neurons, causing sustained sequestration that reduces receptor responsiveness and precedes MOR phosphorylation and internalization. This Gα sequestration by RGSZ2 is associated with increased free Gβγ, GRK-mediated phosphorylation, and MOR endocytosis.\",\n      \"method\": \"In vivo intracerebroventricular drug administration, co-immunoprecipitation from brain tissue, Western blot, behavioral antinociception assay\",\n      \"journal\": \"Molecular pain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP from native brain tissue combined with behavioral functional readout, single lab\",\n      \"pmids\": [\"17634133\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"RGSZ2 (RGS17) is part of a complex at the C-terminus of the mu-opioid receptor (MOR) with HINT1/PKCI. Morphine-activated NMDAR/nNOS cascade generates free zinc ions that recruit inactive PKCγ to the MOR via the HINT1/RGSZ complex through PKC C1 cysteine-rich domains. PKCγ then phosphorylates the MOR to reduce signal strength.\",\n      \"method\": \"Intracerebroventricular drug administration in vivo, co-immunoprecipitation, HINT1 knockdown, pharmacological inhibitors of NMDAR (MK801), NOS (SNAP/TPEN), phorbol esters, Western blot\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple pharmacological and genetic interventions with Co-IP in vivo, single lab, multiple orthogonal approaches\",\n      \"pmids\": [\"18652891\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"RGS17 promotes tumor cell proliferation through the cAMP-PKA-CREB pathway: RGS17 increases cAMP levels, enhances forskolin-mediated cAMP production, promotes CREB phosphorylation, and enhances CREB-responsive gene expression. Inhibition of cAMP-dependent kinase (PKA) prevents tumor cell proliferation, which is partially rescued by RGS17 overexpression.\",\n      \"method\": \"siRNA knockdown and overexpression in tumor cells, exon microarray and transcript analysis, cAMP measurement assays, forskolin stimulation, PKA inhibition, colony formation, xenograft in nude mice\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss- and gain-of-function with multiple functional readouts and pharmacological epistasis, single lab\",\n      \"pmids\": [\"19244110\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RGSZ2 binds to the PDZ domain of neural nitric oxide synthase (nNOS) via PDZ-binding motifs upstream of and within the RGSZ2 RGS box, negatively regulating nNOS activity. In RGSZ2-deficient mice, morphine over-stimulates the nNOS/NO/NMDAR/CaMKII pathway, causing rapid analgesic tolerance. Recovery of RGSZ2 levels or inhibition of nNOS, PKC, NMDAR, or CaMKII restored MOR signaling.\",\n      \"method\": \"RGSZ2 knockout/knockdown mice, intracerebroventricular drug administration, behavioral antinociception assay, pharmacological inhibition of nNOS/NMDAR/CaMKII/PKC, co-immunoprecipitation, Western blot\",\n      \"journal\": \"Antioxidants & redox signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout with defined behavioral phenotype and pharmacological rescue experiments, single lab\",\n      \"pmids\": [\"21348811\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RGSZ2 undergoes covalent SUMOylation within its RGS box (RH domain), which abolishes GAP activity without affecting binding to GPCR-activated GαGTP subunits. Non-covalent SUMO binding to SUMO-interacting motifs (SIMs) within the RH domain blocks RGSZ2 from interacting with GαGTP subunits. A third SIM upstream of the RH domain can mediate regulatory interactions with sumoylated proteins without affecting GαGTP binding or GAP activity.\",\n      \"method\": \"SUMOylation assays, mutagenesis of RGS box and SIM motifs, in vitro GAP assays, GαGTP binding assays, immunoprecipitation\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro GAP assay with mutagenesis and multiple binding assays, single lab\",\n      \"pmids\": [\"22163035\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RGS17 associates with both Giα and Gqα subunits in hepatocellular carcinoma (HCC) cells. Altering RGS17 expression profoundly affected HCC cell mitogenesis and migration. RGS17 protein levels are governed by protein degradation rather than by miRNAs in HCC cells.\",\n      \"method\": \"Co-immunoprecipitation in human and rat HCC cells, siRNA knockdown and overexpression, cell proliferation and migration assays, miRNA inhibition experiments\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for Gα interaction, loss/gain of function, single lab with two orthogonal methods\",\n      \"pmids\": [\"21620966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RGSZ2 functions as a redox zinc switch in neurons: agonist activation of a broad panel of GPCRs stimulates the RGSZ2-nNOS complex to produce NO, which releases zinc ions from the RGSZ2 zinc finger in a nNOS/NO-dependent mechanism, subsequently recruiting PKCγ and Raf-1 to the C-terminus or third internal loop of the activated GPCR.\",\n      \"method\": \"Co-immunoprecipitation of RGSZ2-nNOS-GPCR complexes, zinc chelation (TPEN), NOS inhibition, pharmacological activation of multiple GPCRs, Western blot\",\n      \"journal\": \"Antioxidants & redox signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP across multiple GPCR systems with pharmacological validation, single lab\",\n      \"pmids\": [\"22563771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RGS17 knockdown significantly reduces chemotherapy-induced cell toxicity (cisplatin, vincristine, docetaxel) in ovarian cancer cells. RGS17 overexpression blocked LPA-mediated AKT activation, suggesting RGS17 blunts AKT survival signaling. Loss of RGS17 expression contributes to chemoresistance through amplification of AKT signals.\",\n      \"method\": \"siRNA knockdown, RGS17 overexpression, cell viability assays, phosphatidylserine externalization (apoptosis) assay, AKT phosphorylation by Western blot in SKOV-3 and MDR-HeyA8 cells\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss- and gain-of-function with defined mechanistic readout (AKT activation), two cell line models, single lab\",\n      \"pmids\": [\"21044322\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Crystal structure of RGS17 at 1.5-Å resolution reveals Ca2+ bound to conserved positions on the predicted Gα-binding surface. NMR chemical shift perturbations confirmed Ca2+ binds the same site in solution. RGS17 has >55-fold higher affinity for Ca2+ than Mg2+. Ca2+ promotes RGS17 interaction with activated Gα and decreases the Km for GTP hydrolysis, suggesting Ca2+ positively regulates RGS17 GAP activity.\",\n      \"method\": \"X-ray crystallography (1.5-Å), NMR chemical shift perturbation assay, binding affinity measurements (Ca2+ vs Mg2+), in vitro GTPase assay with Ca2+\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with NMR validation, quantitative binding assay, and functional GTPase assay, multiple orthogonal methods in single study\",\n      \"pmids\": [\"30940727\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Natural product inhibitors of RGS17 (sanguinarine and celastrol) bind RGS17 through a cysteine-dependent mechanism, verified by site-directed mutagenesis and cysteine reactivity assessment. These compounds inhibit the RGS17-Gαo protein-protein interaction with IC50 values in high nanomolar to low micromolar range, with dissociation constants confirmed by ITC.\",\n      \"method\": \"High-throughput AlphaScreen assay, site-directed mutagenesis, isothermal titration calorimetry (ITC), mass spectrometry, Western blot, confocal microscopy, cytotoxicity assays\",\n      \"journal\": \"Journal of natural products\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis confirming cysteine-dependent binding mechanism with ITC and biochemical validation, single lab\",\n      \"pmids\": [\"28621943\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The RGS17-Gαo protein-protein interaction was reconstituted and quantified using AlphaScreen technology, enabling high-throughput screening. Small-molecule inhibitors of the Gαo-RGS17 interaction were identified with IC50 values <10 µM.\",\n      \"method\": \"AlphaScreen protein-protein interaction assay, high-throughput screening of NCI Diversity Set II, dose-response IC50 determination\",\n      \"journal\": \"Journal of biomolecular screening\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro reconstitution of the RGS17-Gαo interaction with quantitative readout, single lab, single method\",\n      \"pmids\": [\"21680864\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RGS17 knockout in cochlear hair cells protects against cisplatin-induced outer hair cell loss, elevation of auditory brainstem response thresholds, cochlear inflammation (reduced CXCL1, CD45+, and CD68+ immune cells), and inner hair cell synaptopathy, placing RGS17 upstream of the inflammatory immune cascade in cisplatin ototoxicity.\",\n      \"method\": \"Hair-cell-specific RGS17 knockout mice, cisplatin treatment protocol, auditory brainstem response (ABR) threshold measurement, immunohistochemistry for CXCL1/CD45/CD68, hair cell counting\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — cell-type-specific genetic knockout with multiple defined phenotypic readouts, single lab, single study\",\n      \"pmids\": [\"40061942\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Tumor-secreted RGS17 impairs CD8+ T cell cytotoxicity in lung adenocarcinoma by reducing IFN-γ and Granzyme B secretion and inhibiting glycolysis (reduced glucose consumption, lactate production, and ECAR) via the PI3K/AKT pathway. RGS17 knockdown in tumor cells increased CD8+ T cell tumor infiltration.\",\n      \"method\": \"RGS17 knockdown in tumor cells, conditioned media transfer to CD8+ T cells, flow cytometry for T cell function (IFN-γ/Granzyme B), glycolysis measurement (ECAR, glucose consumption, lactate production), Western blot for PI3K/AKT pathway components\",\n      \"journal\": \"Discover oncology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, mechanistic pathway inferred from knockdown and pathway readouts without direct reconstitution or epistasis confirmation\",\n      \"pmids\": [\"40627213\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RGS17 (RGSZ2) is a member of the RZ/A subfamily of RGS proteins that acts as a GTPase-activating protein (GAP) for Gαi1-3, Gαo, Gαz, and Gαq subunits; its GAP activity is positively regulated by Ca2+ binding to the Gα-binding surface (established by crystal structure and NMR), negatively regulated by SUMOylation (which abolishes GAP activity) and SUMO-SIM interactions (which block GαGTP binding), and it operates at the C-terminus of mu-opioid and other GPCRs as part of a complex with HINT1 and nNOS, where it sequesters activated Gα subunits, releases zinc via a redox/nNOS/NO mechanism to recruit PKCγ and Raf-1, and restrains nNOS-NMDAR-CaMKII signaling; in cancer contexts, RGS17 promotes tumor cell proliferation through the cAMP-PKA-CREB axis and modulates AKT survival signaling, while also impairing anti-tumor CD8+ T cell glycolysis via PI3K/AKT.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RGS17 (RGSZ2) is a GTPase-activating protein (GAP) that accelerates GTP hydrolysis on activated Gαi1-3, Gαo, and Gαz subunits and binds active Gαq, but not Gαs, thereby terminating G protein signaling downstream of dopamine-D2/Gαi and TRH/Gαq receptors [#0]. Its GAP activity is positively regulated by Ca2+ binding to conserved positions on the Gα-binding surface, which promotes Gα interaction and lowers the Km for GTP hydrolysis [#10], and is negatively regulated by covalent SUMOylation within the RGS box (which abolishes GAP activity) and by non-covalent SUMO–SIM interactions (which block Gα-GTP binding) [#6]. At the C-terminus of mu-opioid and other GPCRs, RGS17 acts as an effector antagonist that sequesters morphine-activated Gα subunits to dampen receptor responsiveness, operating within a HINT1/PKCγ complex in which an nNOS/NO-dependent redox zinc switch releases zinc from the RGSZ2 zinc finger to recruit PKCγ and Raf-1 [#1, #3, #8], while RGS17 binding to the nNOS PDZ domain restrains the nNOS/NO/NMDAR/CaMKII pathway and prevents morphine analgesic tolerance [#5]. In cancer, RGS17 drives tumor cell proliferation through a cAMP-PKA-CREB axis [#4] and is targetable through its Gαo interaction surface by cysteine-reactive small-molecule inhibitors [#11, #12].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Established RGS17's core biochemical identity as a GAP with defined Gα selectivity, answering which heterotrimeric G proteins it regulates and how it shapes receptor signaling.\",\n      \"evidence\": \"Yeast two-hybrid, in vitro GAP assays, and cell-based cAMP/calcium signaling readouts\",\n      \"pmids\": [\"15096504\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve subcellular targeting or receptor-specific recruitment\", \"No structural basis for Gα selectivity\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Showed RGS17 functions as an effector antagonist at mu-opioid receptors by sequestering activated Gα, linking its GAP biochemistry to opioid antinociception in vivo.\",\n      \"evidence\": \"Co-IP from brain membranes and in vivo siRNA knockdown with antinociception behavior\",\n      \"pmids\": [\"15827571\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of sustained sequestration not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined the temporal order of RGS17 action, showing Gα sequestration precedes MOR phosphorylation and internalization during morphine adaptation.\",\n      \"evidence\": \"In vivo icv administration, Co-IP from brain tissue, behavioral assay\",\n      \"pmids\": [\"17634133\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal link to GRK recruitment correlative\", \"Single lab\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Placed RGS17 in a HINT1/PKCγ signaling complex and identified a zinc-dependent recruitment mechanism for PKCγ to the MOR.\",\n      \"evidence\": \"In vivo pharmacology (NMDAR/NOS inhibitors, zinc chelators), Co-IP, HINT1 knockdown\",\n      \"pmids\": [\"18652891\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Stoichiometry and direct vs indirect binding within complex unresolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified an oncogenic role for RGS17 via the cAMP-PKA-CREB axis, distinct from its GAP-mediated signal termination.\",\n      \"evidence\": \"siRNA/overexpression in tumor cells, cAMP assays, PKA inhibition epistasis, xenografts\",\n      \"pmids\": [\"19244110\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How a Gαi GAP raises cAMP not mechanistically reconciled\", \"Single lab\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Linked RGS17 to chemosensitivity by showing it blunts LPA-driven AKT survival signaling in ovarian cancer.\",\n      \"evidence\": \"siRNA knockdown/overexpression, viability and apoptosis assays, AKT phosphorylation in two cell lines\",\n      \"pmids\": [\"21044322\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct connection between GAP activity and AKT modulation not established\", \"Single lab\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Resolved how RGS17 restrains nNOS, defining a PDZ-mediated interaction that prevents morphine analgesic tolerance.\",\n      \"evidence\": \"RGSZ2 knockout/knockdown mice, behavioral assays, pharmacological rescue, Co-IP\",\n      \"pmids\": [\"21348811\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct PDZ binding affinity not quantified\", \"Single lab\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Uncovered SUMOylation and SUMO-SIM interactions as on/off switches for RGS17 GAP activity and Gα binding.\",\n      \"evidence\": \"SUMOylation assays, RGS-box/SIM mutagenesis, in vitro GAP and Gα-GTP binding assays\",\n      \"pmids\": [\"22163035\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo prevalence of SUMOylated RGS17 unknown\", \"SUMO ligase machinery not identified\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Connected RGS17 to dual Giα/Gqα engagement in hepatocellular carcinoma and showed its abundance is set by protein degradation.\",\n      \"evidence\": \"Co-IP, knockdown/overexpression with proliferation/migration assays, miRNA inhibition\",\n      \"pmids\": [\"21620966\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Degradation pathway/E3 ligase not identified\", \"Single lab\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Reconstituted the RGS17-Gαo interaction in a high-throughput format, enabling small-molecule inhibitor discovery against an oncogenic target.\",\n      \"evidence\": \"AlphaScreen protein-protein interaction assay, HTS, IC50 determination\",\n      \"pmids\": [\"21680864\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cellular efficacy of hits not shown\", \"Single in vitro method\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Generalized the RGSZ2 redox zinc switch beyond opioids, showing diverse GPCRs trigger nNOS/NO-dependent zinc release that recruits PKCγ and Raf-1.\",\n      \"evidence\": \"Co-IP across multiple GPCR systems with zinc chelation and NOS inhibition\",\n      \"pmids\": [\"22563771\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the relevant zinc finger residues not pinpointed\", \"Single lab\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined a cysteine-dependent inhibitor binding mechanism, providing a chemical strategy to disrupt the RGS17-Gαo interaction.\",\n      \"evidence\": \"AlphaScreen, site-directed mutagenesis, ITC, mass spectrometry\",\n      \"pmids\": [\"28621943\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cysteine reactivity raises selectivity concerns\", \"Single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Provided a structural basis for Ca2+ as a positive regulator of GAP activity, refining how RGS17 catalysis is tuned by divalent cations.\",\n      \"evidence\": \"1.5-Å crystal structure, NMR chemical shift perturbation, binding affinity and GTPase assays\",\n      \"pmids\": [\"30940727\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological Ca2+ concentration dependence in cells not tested\", \"Interplay with SUMO regulation unaddressed\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Placed RGS17 upstream of the inflammatory immune cascade in cisplatin ototoxicity using hair-cell-specific knockout.\",\n      \"evidence\": \"Hair-cell-specific RGS17 knockout mice, cisplatin, ABR thresholds, immunohistochemistry\",\n      \"pmids\": [\"40061942\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Downstream signaling linking RGS17 to inflammation not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Suggested tumor-secreted RGS17 suppresses CD8+ T cell glycolysis and cytotoxicity via PI3K/AKT, extending its oncogenic role to immune evasion.\",\n      \"evidence\": \"Tumor knockdown, conditioned media transfer, T cell function/glycolysis assays, PI3K/AKT Western blot\",\n      \"pmids\": [\"40627213\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Mechanism inferred without reconstitution or epistasis confirmation\", \"How an intracellular GAP acts as a secreted factor unexplained\", \"Single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How RGS17's biochemical GAP activity is mechanistically reconciled with its opposing roles in cAMP-PKA-CREB proliferation, AKT modulation, and immune evasion remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unifying model linking GAP activity to downstream cAMP/AKT phenotypes\", \"Regulatory crosstalk between Ca2+, SUMO, and zinc-switch states untested in vivo\", \"Endogenous degradation machinery controlling RGS17 abundance unidentified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 6, 10]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 5]},\n      {\"term_id\": \"GO:0140313\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 3, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 4]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [3, 5, 8]}\n    ],\n    \"complexes\": [\"RGSZ2-HINT1-nNOS complex at mu-opioid receptor C-terminus\"],\n    \"partners\": [\"GNAO1\", \"GNAZ\", \"GNAI1\", \"GNAQ\", \"OPRM1\", \"HINT1\", \"NOS1\", \"PRKCG\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":4,"faith_pct":100.0}}