{"gene":"RGS7","run_date":"2026-04-28T19:45:45","timeline":{"discoveries":[{"year":1998,"finding":"Gbeta5 forms a tight complex with RGS7 in the retina; the Ggamma-like (GGL) domain of RGS7 mediates binding to Gbeta5, and deletion of this domain prevents Gbeta5 binding while retaining Galpha interaction; Gbeta5 binding to RGS7 blocks RGS7 interaction with Galphao.","method":"Native protein purification from bovine retina, in vitro reconstitution with recombinant proteins, gel filtration, ion-exchange chromatography, immunoprecipitation, domain deletion mutagenesis","journal":"Proceedings of the National Academy of Sciences / Biochemical and Biophysical Research Communications","confidence":"High","confidence_rationale":"Tier 1 — reconstituted in vitro, replicated across multiple labs and methods","pmids":["9731233","10051672"],"is_preprint":false},{"year":1999,"finding":"RGS7 is a short-lived protein degraded via the proteasome pathway; interaction with the C-terminal domain of polycystin (PKD1 gene product) inhibits proteasomal degradation of RGS7 and promotes its relocalization to the membrane.","method":"Proteasome inhibitor treatment, co-immunoprecipitation, subcellular localization by transfection/imaging","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (degradation assay, co-IP, localization) in single rigorous paper","pmids":["10339594"],"is_preprint":false},{"year":1999,"finding":"TNF-alpha prevents proteasome-dependent degradation of RGS7 via activation of the stress-activated protein kinase p38, requiring candidate MAPK phosphorylation sites on RGS7; in vivo, RGS7 is rapidly upregulated in mouse brain after endotoxin or TNF-alpha exposure.","method":"Proteasome inhibitor assays, p38 kinase activation, site-directed mutagenesis of phosphorylation sites, in vivo mouse model with TNF receptor 1 knockout","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 — multiple methods including KO mouse model, kinase activation, and mutagenesis","pmids":["10426315"],"is_preprint":false},{"year":1999,"finding":"The GGL domains of RGS6, RGS7, and RGS11 selectively bind Gbeta5 but not other Gbeta subunits; Phe-61 of Ggamma2, when mutated to tryptophan (the residue in GGL domains), increases Gbeta5/Ggamma2 heterodimer stability, revealing the structural basis of GGL/Gbeta5 specificity.","method":"Co-expression with different Gbeta subunits, immunoprecipitation, mutagenesis of Ggamma residues","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis with functional validation replicated across family members","pmids":["10339615"],"is_preprint":false},{"year":1999,"finding":"RGS7 accelerates activation kinetics of GIRK channels similarly to RGS8, but its acceleration of deactivation is significantly weaker; RGS7 recombinant protein binds preferentially to Galphao, Galphai3, and Galphaz.","method":"Xenopus oocyte electrophysiology, co-expression of GIRK1/2 with RGS7, recombinant protein binding assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro electrophysiology and binding assays with defined functional readout","pmids":["10092682"],"is_preprint":false},{"year":2000,"finding":"Gbeta5 and RGS7 exist exclusively as obligatory heterodimers in brain; co-expression of Gbeta5 dramatically increases RGS7 protein levels (and vice versa) through a non-transcriptional mechanism based on increased protein stability upon dimerization; native Gbeta5-RGS7 does not co-purify with Galphao or Galphaq, yet Gbeta5-RGS7 inhibits Galphaq-mediated Ca2+ signaling in transfected cells.","method":"Immunoprecipitation, co-purification from brain, COS-7 cell co-expression, conventional chromatography, Ca2+ signaling assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP, chromatography, functional assay replicated across tissues and cells","pmids":["10840031"],"is_preprint":false},{"year":2000,"finding":"RGS7 is palmitoylated on membrane-bound but not cytosolic fractions; palmitoylation does not prevent RGS7/Galphao interactions; the isolated RGS domain of RGS7 selectively binds activated Galpha(i/o) and stimulates GTPase activity; the RGS7/Gbeta5 complex selectively interacts with Galphao (not Galphai1), indicating Gbeta5 association restricts Galpha selectivity.","method":"Metabolic labeling with [3H]-palmitate, subcellular fractionation, in vitro GTPase assay, pulldown from brain extracts","journal":"Journal of neurochemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro GTPase assay and palmitoylation labeling with domain mutagenesis","pmids":["11032900"],"is_preprint":false},{"year":2000,"finding":"RGS7 RGS box domain (aa 305-453) enhances Galphao GTPase deactivation with catalytic efficiency of 0.44×10^6 M^-1s^-1, preferring Galphao over Galphai2 and Galphai1; specificity for Galphao resides in the RGS domain itself, independent of N- or C-terminal extensions or Gbeta5.","method":"Stopped-flow spectroscopy measuring intrinsic tryptophan fluorescence, GST-RGS domain fusion proteins, kinetic analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — rigorous in vitro kinetic assay with domain deletion analysis","pmids":["10942773"],"is_preprint":false},{"year":2003,"finding":"Gbeta5/RGS7 stimulates GTPase activity of Gi family Galpha subunits (but not Galphaq or Galpha11) in proteoliposomes; Gbeta5/RGS9 and Gbeta5/RGS11 are more potent GAPs for Galphai1/i2/i3 than Gbeta5/RGS7; Gbeta5/RGS7 and Gbeta5/RGS9 can inhibit Gbeta5/RGS11-stimulated GTPase activity of Galphao.","method":"Purified Sf9-derived proteins, steady-state GTPase assay in proteoliposomes with reconstituted receptor-G protein heterotrimers","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstituted in vitro GTPase assay with purified components","pmids":["12531899"],"is_preprint":false},{"year":2003,"finding":"The Gbeta5-RGS7 complex interacts directly with Galphaq in living cells via FRET; this interaction occurs intracellularly and the complex inhibits Galphaq-mediated Ca2+ signaling.","method":"FRET spectroscopy and microscopy with YFP/CFP-tagged proteins in transfected mammalian cells, co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — FRET with orthogonal co-IP validation in living cells","pmids":["12670932"],"is_preprint":false},{"year":2004,"finding":"In C. elegans, RGS-7 (ortholog of vertebrate RGS7) localizes to the cell cortex and its RGS domain stimulates GTP hydrolysis by Galphao; RGS-7 completes a receptor-independent G protein cycle required for asymmetric mitotic spindle positioning, acting downstream of nonreceptor G protein activators RIC-8 and GPR-1/2.","method":"Genetic epistasis (C. elegans mutants), in vitro GTPase assay with recombinant RGS-7 and Galphao, live imaging of spindle movements","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution plus genetic epistasis in an ortholog","pmids":["15479638"],"is_preprint":false},{"year":2004,"finding":"Galphao promotes palmitoylation and plasma membrane recruitment of Gbeta5-RGS7; constitutively active Galphao (R179C) retains this ability whereas lipidation-deficient (G2A), RGS-insensitive (G184S), and inactive (G204A) Galphao mutants do not; Cys133 of RGS7 is a putative palmitoylation site; the DEP domain (aa 76-128) of RGS7 is required for Galphao-mediated membrane recruitment.","method":"Subcellular fractionation, palmitoylation assay ([3H]-palmitate labeling), site-directed mutagenesis, immunofluorescence in HEK293 cells","journal":"Molecular pharmacology","confidence":"High","confidence_rationale":"Tier 1 — metabolic labeling, mutagenesis, and fractionation with multiple Galpha mutants","pmids":["15496508"],"is_preprint":false},{"year":2005,"finding":"R7BP (RGS7 family binding protein), a palmitoylated neuronally expressed protein, binds R7-Gbeta5 complexes and shuttles them between the plasma membrane and nucleus; palmitoylation of R7BP targets it to the plasma membrane, and depalmitoylation translocates the R7BP-R7-Gbeta5 complex to the nucleus; plasma membrane-targeted R7BP greatly augments RGS7-mediated attenuation of GPCR-activated GIRK channel activation compared to non-palmitoylated R7BP.","method":"Palmitoylation assay, subcellular fractionation, live-cell imaging, GIRK electrophysiology in HEK293 cells, co-immunoprecipitation","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 — multiple orthogonal methods including functional electrophysiology and palmitoylation assay","pmids":["15897264"],"is_preprint":false},{"year":2006,"finding":"R7BP augments RGS7*Gbeta5 function exclusively through a palmitoylation-regulated plasma membrane-targeting mechanism; unpalmitoylated R7BP undergoes nuclear/cytoplasmic shuttling mediated by a C-terminal polybasic motif; cytoplasmic RGS7*Gbeta5*R7BP heterotrimers and RGS7*Gbeta5 heterodimers are equivalently inefficient GPCR signaling regulators.","method":"Mutagenesis of palmitoylation sites, nuclear export inhibitor treatment, GIRK electrophysiology, subcellular fractionation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis, functional electrophysiology, and fractionation","pmids":["16867977"],"is_preprint":false},{"year":2007,"finding":"The DEP domain of RGS7 interacts intramolecularly with the Gbeta5 subunit; this DEP-Gbeta5 interaction is dynamic and produces closed/open conformational states of the Gbeta5-RGS7 dimer; R7BP binding has no effect on DEP-Gbeta5 pull-down; mutation of RGS7 Glu-73/Asp-74 to Ser/Gly (ED/SG) diminishes the DEP-Gbeta5 interaction and alters M3R signaling regulation in the presence of R7BP.","method":"GST pulldown, co-immunoprecipitation, FRET with CFP/YFP-tagged proteins, site-directed mutagenesis, Ca2+ mobilization assay","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 — FRET, GST pulldown, mutagenesis, and functional assay","pmids":["17511476"],"is_preprint":false},{"year":2008,"finding":"RGS7/Gbeta5 complex is specifically targeted to the dendritic tips of ON-bipolar cells; this targeting occurs independently of R7BP association, revealing an adapter-independent targeting mechanism.","method":"In vivo mouse knockout of R7BP, immunofluorescence confocal microscopy of retinal sections","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — genetic KO model with defined subcellular localization phenotype","pmids":["18842904"],"is_preprint":false},{"year":2008,"finding":"Intracellular administration of RGS7 via patch clamp electrodes into locus coeruleus neurons mimics chronic stress-induced decrease in alpha2-autoreceptor (clonidine-evoked) inhibition, demonstrating that elevated RGS7 reduces autoreceptor coupling.","method":"In vivo/in vitro single-unit recordings, patch-clamp intracellular RGS7 delivery, chronic cold stress model","journal":"The European journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 — direct intracellular protein delivery with electrophysiological readout, single lab","pmids":["18461718"],"is_preprint":false},{"year":2009,"finding":"The DEP domain of RGS7 directly binds the third intracellular loop (i3) of the M3 muscarinic receptor; the DEP domain alone is sufficient to inhibit M3R signaling; deletion of the i3 loop or DEP domain abolishes this inhibition; the C-terminus of M3R also interacts with Gbeta5-RGS7 and is required for inhibition of full-length receptor by wild-type (but not open-mutant) Gbeta5-RGS7.","method":"GST pulldown with recombinant i3 loop peptide, Ca2+ mobilization assay, domain deletion mutagenesis, truncation mutants","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro binding with GST-fused receptor domain plus functional cell-based assay and mutagenesis","pmids":["19182865","20443543"],"is_preprint":false},{"year":2009,"finding":"R7BP complexes differentially regulate RGS7 and RGS9-2 in the striatum; striatum-specific knockdown revealed that sensitivity of cocaine-induced motor stimulation depends on RGS7 (not RGS9-2), whose complex formation with R7BP is dictated by RGS9-2 expression levels.","method":"Striatum-specific RNAi knockdown in mice, locomotor behavior assays, biochemical analysis of complex formation","journal":"Neuropsychopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 — region-specific KD with defined behavioral phenotype, single lab","pmids":["20043004"],"is_preprint":false},{"year":2011,"finding":"R7BP undergoes dynamic, signal-regulated palmitate turnover; the palmitoyltransferase DHHC2 mediates de novo and turnover palmitoylation of R7BP; DHHC2 silencing redistributes R7BP from the plasma membrane to the nucleus; Gi/o signaling inhibits R7BP depalmitoylation, stabilizing membrane association of R7-Gbeta5 GAP complexes.","method":"[3H]-palmitate metabolic labeling, DHHC2 siRNA silencing, subcellular fractionation, pertussis toxin treatment","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — metabolic labeling with specific enzyme knockdown and fractionation","pmids":["21343290"],"is_preprint":false},{"year":2012,"finding":"GPR158 and GPR179 recruit RGS7 complexes to the plasma membrane and augment their ability to regulate GPCR signaling; loss of GPR179 in a mouse model of night blindness prevents targeting of RGS7 complex to the postsynaptic compartment of retinal bipolar neurons.","method":"Co-immunoprecipitation, subcellular fractionation, mouse KO model, electroretinography, immunofluorescence","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP, KO mouse model, functional ERG, and localization","pmids":["22689652"],"is_preprint":false},{"year":2012,"finding":"RGS7 and RGS11 are the key GTPase-activating proteins in the mGluR6 pathway of retinal rod ON bipolar cells; concurrent elimination of both RGS7 and RGS11 severely reduces the magnitude and dramatically slows onset of light-evoked responses, consistent with persistently high G protein activity.","method":"RGS7/RGS11 single and double knockout mice, electroretinography, single-cell patch-clamp recordings","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 2 — double KO genetic epistasis with electrophysiological readout","pmids":["22547806"],"is_preprint":false},{"year":2013,"finding":"RGS7/Gbeta5 forms macromolecular complexes with GABAB receptors and GIRK channels in hippocampal CA1 pyramidal neurons; co-expression of RGS7/Gbeta5 markedly accelerates GABAB-GIRK current deactivation kinetics; by immunoelectron microscopy, RGS7/Gbeta5 is enriched around excitatory synapses on dendritic spines in proximity to Girk2 and GABAB1.","method":"Co-immunoprecipitation, patch-clamp electrophysiology, immunoelectron microscopy","journal":"Hippocampus","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP, electrophysiology, and ultrastructural localization","pmids":["23804514"],"is_preprint":false},{"year":2014,"finding":"RGS7, in cooperation with R7BP, regulates GABABR-GIRK signaling in hippocampal pyramidal neurons; deletion of RGS7 in mice dramatically sensitizes GIRK responses to GABAB receptor stimulation and markedly slows channel deactivation kinetics; R7BP sets the dynamic range of GIRK responses; RGS7 loss leads to decreased neuronal excitability and deficits in inhibitory synaptic plasticity, learning, and memory.","method":"RGS7 knockout mice, whole-cell patch-clamp electrophysiology in hippocampal slices, behavioral testing (learning/memory)","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — KO mouse with electrophysiology and behavioral readouts, replicated with R7BP manipulation","pmids":["24755289"],"is_preprint":false},{"year":2014,"finding":"Gbeta5-RGS7 suppresses M3R-stimulated Ca2+ release from intracellular stores but also independently enhances Ca2+ influx via a nifedipine-sensitive channel; the enhanced Ca2+ influx effect is independent of RGS7 GTPase-accelerating protein activity and involves a Gq-mediated pathway.","method":"Ca2+ imaging with selective channel blockers (nifedipine, 2-APB), pertussis toxin, RGS domain-deficient mutant, Gq inhibitor UBO-QIC","journal":"Molecular pharmacology","confidence":"High","confidence_rationale":"Tier 1 — pharmacological dissection with multiple orthogonal inhibitors and RGS domain mutant","pmids":["24586057"],"is_preprint":false},{"year":2015,"finding":"GPR158 is essential for RGS7 expression and membrane localization in the brain (GPR158 KO causes post-transcriptional destabilization of RGS7); the RGS7-binding site maps to the C terminus of GPR158 with homology to R7BP; the proximal GPR158 C terminus enhances RGS7 GAP activity by an allosteric mechanism; the distal GPR158 C terminus contains PDE E-gamma-like motifs that selectively recruit activated G proteins.","method":"GPR158 knockout mice, Western blot/fractionation, in vitro GTPase assay, domain mutagenesis, co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — KO mouse plus in vitro GAP assay and domain mapping","pmids":["25792749"],"is_preprint":false},{"year":2016,"finding":"RGS7 can form homo-oligomers in mouse brain and transfected cells; self-association requires the DEP domain but not the RGS or DHEX domains; R7BP strongly inhibits RGS7 homo-oligomerization; constitutively active Galphao prevents RGS7-RGS7 interaction; GPR158 can bind the RGS7 homo-oligomer without causing its dissociation.","method":"In situ chemical cross-linking, mass spectrometry, co-immunoprecipitation of differentially tagged RGS7, KO mouse tissue","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — cross-linking plus mass spectrometry and co-IP with domain mutagenesis","pmids":["26895961"],"is_preprint":false},{"year":2016,"finding":"RGS7/Gbeta5/R7BP complexes localize to the extrasynaptic plasma membrane of dendritic shafts and spines of cerebellar Purkinje cells; R7BP deletion in mice reduces targeting of both RGS7 and Gbeta5 to the plasma membrane in cerebellum.","method":"Co-immunoprecipitation, immunohistochemistry, immunoelectron microscopy, R7BP KO mouse model","journal":"Frontiers in neuroanatomy","confidence":"High","confidence_rationale":"Tier 2 — KO mouse with ultrastructural localization and co-IP","pmids":["27965545"],"is_preprint":false},{"year":2018,"finding":"Crystal structure of the RGS7-Gbeta5-R7BP complex reveals unique organizational features including long-range conformational changes during allosteric modulation; intermolecular interfaces act in synergy for coordinated modulation of GAP activity.","method":"X-ray crystallography, molecular dynamics simulation, hydrogen-deuterium exchange mass spectrometry","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with MD and MS validation","pmids":["30540250"],"is_preprint":false},{"year":2018,"finding":"Hippocampal RGS7 forms two distinct complexes with alternative subunit configurations bound to either R7BP or GPR158; both complexes target nearly the entire pool of RGS7 to the plasma membrane; only R7BP-containing complexes (not GPR158-containing complexes) accelerate GIRK and CaV2 channel kinetics modulated by GABABRs; GPR158 overexpression inhibits RGS7-assisted temporal modulation.","method":"Quantitative biochemistry (co-IP, fractionation), patch-clamp electrophysiology in cultured neurons and brain slices, genetic KO and overexpression in mice","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — genetic KO, overexpression, quantitative biochemistry, and electrophysiology","pmids":["30315127"],"is_preprint":false},{"year":2018,"finding":"Chronic stress promotes membrane recruitment of RGS7 via GPR158 in the medial prefrontal cortex; the resultant GPR158-RGS7 complex suppresses homeostatic cAMP regulation by inhibitory GPCRs; RGS7 loss in mice induces antidepressant-like phenotype; restoration of RGS7 within mPFC rescues the phenotype in a GPR158-dependent manner.","method":"Mouse KO and viral RGS7 re-expression, biochemical fractionation, cAMP measurement, behavioral assays","journal":"Neuropsychopharmacology","confidence":"High","confidence_rationale":"Tier 2 — KO plus region-specific rescue with GPR158-dependent requirement","pmids":["30546127"],"is_preprint":false},{"year":2019,"finding":"The RGS domains of RGS6 and RGS7 alone are sufficient for Galphao vs. Galphai1 selectivity; three 'disruptor residues' in the RGS6/7 domains non-specifically attenuate RGS-Galpha interactions, while a unique 'modulatory' residue bypasses this inhibitory effect specifically toward Galphao, constituting a two-tier selectivity mechanism.","method":"In vitro GTPase assay, site-directed mutagenesis of RGS domain residues, computational structural modeling","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 — in vitro GTPase assay with systematic mutagenesis","pmids":["31153905"],"is_preprint":false},{"year":2019,"finding":"The GPR158-RGS7 complex controls A-type potassium channel (Kv4.2) function in L2/3 pyramidal neurons of the PFC; GPR158 physically associates with Kv4.2 and promotes its function by suppressing inhibitory cAMP-PKA-mediated phosphorylation; deletion of GPR158 or RGS7 enhances excitability of these neurons and prevents stress-induced decreases in excitability.","method":"Co-immunoprecipitation (GPR158-Kv4.2), KO mouse models, patch-clamp electrophysiology, cAMP/PKA pathway pharmacology","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — co-IP with KO mice, electrophysiology, and pharmacological pathway dissection","pmids":["31311860"],"is_preprint":false},{"year":2021,"finding":"Arginyltransferase (Ate1) facilitates proteasomal degradation of RGS7; deletion of Ate1 in the nervous system raises RGS7 levels in retinal ON bipolar cells and increases light-evoked response sensitivities; RGS7 degradation via proteasome is abolished in Ate1 knockout mouse embryonic fibroblasts.","method":"Conditional Ate1 KO mouse, electroretinography, proteasome inhibition assay in MEF cells, Western blot","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with functional ERG and biochemical proteasome assay","pmids":["33931669"],"is_preprint":false},{"year":2021,"finding":"Cryo-EM structure of human GPR158 alone and bound to RGS7-Gbeta5 reveals: GPR158 dimerizes through PAS-fold extracellular and transmembrane domains stabilized by phospholipids; the DHEX domain of RGS7 docks to ICL2, ICL3, TM3 and first coiled-coil helix of GPR158; a second RGS7 molecule is recruited by the second coiled-coil helix; unique features of the RGS7-binding site underlie selectivity of GPR158 for RGS7.","method":"Single-particle cryo-EM structure determination","journal":"Science / Nature communications","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structures independently solved by two groups","pmids":["34793198","34815401"],"is_preprint":false},{"year":2022,"finding":"RGS7 forms a complex with CaMKII in ventricular cardiomyocytes, supported by key residues K412 and P391 in the RGS domain; RGS7 facilitates CaMKII oxidation, phosphorylation, and CaMKII-dependent oxidative stress and apoptosis following chemotherapy; cardiac-specific RGS7 knockdown protects against doxorubicin cardiotoxicity; RGS7 also drives neuregulin-1 secretion mediating paracrine VCM-EC communication.","method":"Co-immunoprecipitation (RGS7-CaMKII), site-directed mutagenesis (K412, P391), cardiac-specific KD/OE in mice, CaMKII oxidation/phosphorylation assays, ROS measurement","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 2 — co-IP with mutagenesis, cardiac-specific KD/OE with defined mechanistic readouts","pmids":["36574707"],"is_preprint":false},{"year":2022,"finding":"In the liver, RGS7 forms a complex with transcription factor ATF3 and histone acetyltransferase Tip60; this complex drives TNFα release from hepatocytes and stellate cells; removal of domains necessary for ATF3/Tip60 binding abolishes RGS7-dependent ROS generation and cell death; hepatic RGS7 knockdown protects against NAFLD-associated fibrosis and inflammation.","method":"Co-immunoprecipitation (RGS7-ATF3-Tip60), domain deletion mutagenesis, hepatic RGS7 KD in mice (shRNA), high-fat diet model, TNFα ELISA","journal":"Antioxidants & redox signaling","confidence":"High","confidence_rationale":"Tier 2 — co-IP with domain mutagenesis, in vivo KD with defined functional readouts","pmids":["35521658"],"is_preprint":false},{"year":2023,"finding":"RGS7 forms a complex with acetyltransferase Tip60 and deacetylase SIRT1 in ventricular cardiomyocytes; this complex controls acetylation of the p65 subunit of NF-kB, driving pro-inflammatory signaling; Tip60 inhibition or SIRT1 activation mitigates RGS7-driven cardiac inflammation.","method":"Co-immunoprecipitation (RGS7-Tip60-SIRT1), acetylation status assay of p65, Tip60 inhibitor/SIRT1 activator treatment, cardiac RGS7 OE in mice","journal":"Cellular and molecular life sciences","confidence":"High","confidence_rationale":"Tier 2 — co-IP with pharmacological intervention and defined biochemical readout","pmids":["37589751"],"is_preprint":false},{"year":2012,"finding":"RGS7 concentrates at the plasma membrane of cell bodies, along processes in lamellipodia/filopodia-like structures, and at dendritic tips in retinal and dorsal root ganglion neurons; at the plasma membrane, RGS7 co-localizes with R7BP, Galphao, and Galphaq; punctate cytoplasmic localization is mediated by the DEP/DHEX domains; centrosomal localization is mediated by the DHEX domain.","method":"Immunofluorescence confocal microscopy of native neurons and transfected cell lines, domain deletion analysis","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 3 — localization with domain mutagenesis but limited functional consequence established","pmids":["22640015"],"is_preprint":false}],"current_model":"RGS7 functions as a GTPase-activating protein (GAP) selective for Gi/o family Galpha subunits (especially Galphao), always existing in vivo as an obligatory heterodimer with Gbeta5 via its GGL domain; this core Gbeta5-RGS7 dimer is recruited to the plasma membrane by palmitoylated R7BP or orphan receptor GPR158, which control its localization, stability, and catalytic activity through allosteric mechanisms; the DEP domain mediates receptor subtype selectivity (e.g., M3R) through direct interaction with intracellular loops, and the complex is regulated by reversible palmitoylation, proteasomal degradation (facilitated by arginyltransferase Ate1 and inhibited by polycystin/TNF-alpha/p38 signaling), homo-oligomerization, and non-canonical interactions with CaMKII, Tip60/SIRT1, and ATF3 in cardiac and hepatic contexts."},"narrative":{"teleology":[{"year":1998,"claim":"Identification of Gβ5 as an obligate partner resolved how R7-family RGS proteins differ from other RGS proteins: the GGL domain of RGS7 mediates a tight, specific complex with Gβ5, and this interaction modulates Gαo binding.","evidence":"Native purification from bovine retina, in vitro reconstitution, domain deletion mutagenesis","pmids":["9731233","10051672"],"confidence":"High","gaps":["Whether Gβ5 binding inhibits or redirects GAP activity in vivo was unresolved","Structural basis of GGL-Gβ5 interface not yet determined"]},{"year":1999,"claim":"Discovery that RGS7 is a short-lived proteasomal substrate whose stability is regulated by polycystin (PKD1) and by TNF-α/p38 MAPK signaling established protein turnover as a major regulatory axis controlling RGS7 abundance in vivo.","evidence":"Proteasome inhibitor assays, p38 kinase activation, PKD1 co-IP, TNF receptor 1 KO mice","pmids":["10339594","10426315"],"confidence":"High","gaps":["Direct phosphorylation sites on RGS7 responsible for p38-mediated stabilization not fully mapped","Relationship between polycystin and Gβ5-mediated stabilization unclear"]},{"year":1999,"claim":"Functional characterization of RGS7 in GIRK channel modulation and Gα binding specificity showed it accelerates channel activation but is a weaker deactivation accelerator than RGS8, with preferential binding to Gαo, Gαi3, and Gαz.","evidence":"Xenopus oocyte GIRK electrophysiology, recombinant protein binding assay","pmids":["10092682"],"confidence":"High","gaps":["Why deactivation acceleration is weaker than other RGS proteins was mechanistically unexplained","Contribution of Gβ5 to channel kinetics not tested"]},{"year":2000,"claim":"Demonstration that Gβ5 and RGS7 exist exclusively as obligatory heterodimers in brain, with mutual stabilization preventing proteasomal degradation, established the dimer as the functional unit; palmitoylation of RGS7 was linked to membrane association, and the isolated RGS domain confirmed intrinsic Gαo selectivity.","evidence":"Brain co-purification, co-expression stability assays, [³H]-palmitate labeling, stopped-flow GTPase kinetics","pmids":["10840031","11032900","10942773"],"confidence":"High","gaps":["Identity of the palmitoyl transferase unknown","Whether Gβ5 restricts or refines Gα selectivity in native neurons untested"]},{"year":2003,"claim":"Reconstituted proteoliposome assays and live-cell FRET established that Gβ5-RGS7 functions as a GAP for Gi family (not Gq/G11) subunits in a lipid bilayer context, while also physically interacting with Gαq in cells to inhibit Gq-mediated calcium signaling.","evidence":"Proteoliposome GTPase assay with purified proteins, FRET with YFP/CFP-tagged proteins, Ca²⁺ assay","pmids":["12531899","12670932"],"confidence":"High","gaps":["Mechanism of Gαq inhibition without classical GAP activity for Gq unclear","Relative importance of Gi vs Gq regulation in native neurons unknown"]},{"year":2004,"claim":"The C. elegans ortholog RGS-7 was placed into a receptor-independent Gαo GTPase cycle that controls asymmetric spindle positioning, revealing a conserved non-canonical role for the RGS7 family beyond GPCR signal termination; concurrently, Gαo was shown to promote RGS7 palmitoylation and membrane recruitment via the DEP domain.","evidence":"Genetic epistasis in C. elegans, in vitro GTPase assay, mutagenesis of palmitoylation and DEP domain residues in HEK293 cells","pmids":["15479638","15496508"],"confidence":"High","gaps":["Whether spindle-positioning function is conserved in vertebrates untested","Palmitoyl transferase identity still unknown"]},{"year":2005,"claim":"Discovery of R7BP as a palmitoylated membrane anchor resolved how cytosolic Gβ5-RGS7 reaches the plasma membrane to regulate GPCRs: palmitoylated R7BP targets the complex to the membrane and dramatically augments GIRK regulation, while depalmitoylation drives nuclear translocation.","evidence":"Palmitoylation assay, live-cell imaging, GIRK electrophysiology, subcellular fractionation","pmids":["15897264","16867977"],"confidence":"High","gaps":["Nuclear function of depalmitoylated R7BP-RGS7 complex unknown","Enzyme mediating R7BP depalmitoylation not identified"]},{"year":2007,"claim":"Intramolecular DEP-Gβ5 interaction revealed a conformational switch (open/closed states) that gates receptor subtype selectivity; direct binding of the DEP domain to the M3R third intracellular loop established the first mechanism by which an RGS protein recognizes a specific receptor.","evidence":"FRET, GST pulldown with receptor i3 loop, site-directed mutagenesis, Ca²⁺ mobilization assay","pmids":["17511476","19182865"],"confidence":"High","gaps":["Whether other GPCRs are similarly recognized by the DEP domain unknown","Structural basis of DEP-receptor interaction not determined"]},{"year":2011,"claim":"Identification of DHHC2 as the palmitoyltransferase for R7BP, with Gi/o signaling inhibiting depalmitoylation, established a feedback loop: active Gi/o stabilizes the membrane GAP complex that terminates its own signaling.","evidence":"[³H]-palmitate metabolic labeling, DHHC2 siRNA, subcellular fractionation, pertussis toxin","pmids":["21343290"],"confidence":"High","gaps":["Identity of the thioesterase mediating R7BP depalmitoylation unknown","Whether this feedback operates in all neuronal subtypes untested"]},{"year":2012,"claim":"Discovery that orphan receptors GPR158 and GPR179 serve as alternative membrane anchors for RGS7 complexes explained R7BP-independent membrane targeting in retina; GPR179 loss causes night blindness by mislocalizing RGS7, and concurrent RGS7/RGS11 knockout severely impairs rod ON bipolar cell light responses.","evidence":"Co-IP, KO mouse models (GPR179, RGS7, RGS11), electroretinography, patch-clamp","pmids":["22689652","22547806"],"confidence":"High","gaps":["Whether GPR158 vs GPR179 confer distinct functional properties to the complex was unresolved","Mechanism by which GPR158/179 selectivity for specific R7-family members arises unknown"]},{"year":2014,"claim":"Hippocampal RGS7 knockout demonstrated that RGS7 is the dominant GAP controlling GABAB-GIRK signaling kinetics in CA1 pyramidal neurons: its loss sensitizes GIRK responses, slows deactivation, reduces excitability, and impairs learning and memory.","evidence":"RGS7 KO mice, whole-cell patch-clamp in hippocampal slices, behavioral testing","pmids":["24755289"],"confidence":"High","gaps":["Relative contributions of R7BP vs GPR158 complexes to hippocampal function unclear","Whether RGS7 loss affects other hippocampal GPCR-effector pathways untested"]},{"year":2015,"claim":"GPR158 was established as essential for brain RGS7 expression and membrane localization: GPR158 knockout causes post-transcriptional loss of RGS7, and GPR158's C-terminus allosterically enhances RGS7 GAP activity through a mechanism distinct from simple membrane anchoring.","evidence":"GPR158 KO mice, in vitro GTPase assay, domain mutagenesis, co-IP","pmids":["25792749"],"confidence":"High","gaps":["Signal that activates GPR158 unknown (orphan receptor)","Whether allosteric enhancement involves conformational change in RGS domain untested"]},{"year":2016,"claim":"RGS7 homo-oligomerization via the DEP domain was discovered as a new regulatory mechanism: R7BP inhibits and active Gαo prevents oligomerization, while GPR158 can accommodate the oligomer, suggesting context-dependent quaternary structure regulation.","evidence":"In situ cross-linking, mass spectrometry, co-IP of differentially tagged RGS7","pmids":["26895961"],"confidence":"High","gaps":["Functional consequence of homo-oligomerization on GAP activity unknown","Stoichiometry and structure of the oligomer not determined"]},{"year":2018,"claim":"Crystal structure of the RGS7-Gβ5-R7BP ternary complex revealed the structural basis of allosteric regulation, with long-range conformational changes linking the R7BP binding site to the catalytic RGS domain through synergistic intermolecular interfaces.","evidence":"X-ray crystallography, hydrogen-deuterium exchange mass spectrometry, molecular dynamics","pmids":["30540250"],"confidence":"High","gaps":["Structure with Gα substrate not captured","How DEP domain conformational switching maps onto the crystal structure unclear"]},{"year":2018,"claim":"Functional dissection of hippocampal R7BP- vs GPR158-containing complexes revealed that only R7BP-complexes accelerate GIRK and CaV2 channel kinetics, whereas GPR158-complexes serve a distinct role in chronic stress-induced suppression of cAMP signaling in prefrontal cortex, with RGS7 loss producing antidepressant-like phenotypes.","evidence":"KO mice, quantitative biochemistry, patch-clamp in slices, behavioral assays, viral re-expression","pmids":["30315127","30546127"],"confidence":"High","gaps":["Ligand for GPR158 that triggers stress-dependent RGS7 recruitment unknown","Circuit-level mechanisms connecting RGS7-mediated cAMP regulation to depression behavior unclear"]},{"year":2019,"claim":"A two-tier selectivity mechanism was elucidated: three 'disruptor' residues in the RGS domain non-specifically attenuate Gα interaction, while a unique 'modulatory' residue bypasses this inhibition specifically toward Gαo, explaining the longstanding Gαo preference.","evidence":"Systematic site-directed mutagenesis, in vitro GTPase assay","pmids":["31153905"],"confidence":"High","gaps":["Whether this selectivity mechanism is overridden by accessory subunits in vivo untested","No crystal structure of RGS7 RGS domain bound to Gαo"]},{"year":2021,"claim":"Cryo-EM structures of GPR158 alone and in complex with RGS7-Gβ5 revealed the unique architecture: GPR158 dimerizes via PAS-fold and TM domains stabilized by phospholipids, and the DHEX domain of RGS7 docks to ICL2/ICL3/TM3 of GPR158, explaining receptor selectivity for RGS7.","evidence":"Single-particle cryo-EM, independently solved by two groups","pmids":["34793198","34815401"],"confidence":"High","gaps":["Conformational changes upon G protein engagement not captured","Whether phospholipid identity regulates complex assembly unknown"]},{"year":2021,"claim":"Arginyltransferase Ate1 was identified as a facilitator of RGS7 proteasomal degradation, establishing an N-end rule-like pathway; Ate1 knockout elevates RGS7 in retinal ON bipolar cells and increases light sensitivity.","evidence":"Conditional Ate1 KO mouse, electroretinography, proteasome inhibition in MEFs","pmids":["33931669"],"confidence":"High","gaps":["Whether Ate1 directly arginylates RGS7 or acts indirectly unknown","Relationship between Ate1 and Gβ5/GPR158-mediated stabilization unclear"]},{"year":2022,"claim":"Non-canonical roles were established in cardiac and hepatic tissues: RGS7 complexes with CaMKII to promote oxidative stress and doxorubicin cardiotoxicity, and with ATF3/Tip60 to drive TNFα release and NAFLD-associated fibrosis, expanding RGS7 function beyond classical GPCR-GAP activity.","evidence":"Co-IP with mutagenesis, cardiac/hepatic-specific KD/OE in mice, ROS and cytokine assays, high-fat diet model","pmids":["36574707","35521658"],"confidence":"High","gaps":["Whether CaMKII and ATF3/Tip60 interactions require Gβ5 unknown","GAP-dependent vs GAP-independent contributions not fully separated in vivo"]},{"year":2023,"claim":"RGS7 was found to scaffold Tip60 and SIRT1 in cardiomyocytes, controlling acetylation of NF-κB p65 to drive inflammation; pharmacological modulation of this axis mitigated cardiac damage.","evidence":"Co-IP (RGS7-Tip60-SIRT1), p65 acetylation assay, Tip60 inhibitor/SIRT1 activator, cardiac RGS7 OE mice","pmids":["37589751"],"confidence":"High","gaps":["How RGS7 simultaneously engages both Tip60 and SIRT1 structurally is unknown","Whether this scaffolding is relevant in non-cardiac tissues untested"]},{"year":null,"claim":"Key unresolved questions include: the endogenous ligand for GPR158 that regulates RGS7 membrane recruitment under stress; whether non-canonical cardiac/hepatic scaffolding functions require Gβ5 and/or GAP activity; and the structural basis of DEP domain-GPCR recognition.","evidence":"","pmids":[],"confidence":"Low","gaps":["GPR158 ligand identity unknown","No structure of RGS7 DEP domain bound to a receptor intracellular loop","GAP-dependent vs GAP-independent roles not genetically separated in cardiac/hepatic contexts"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[4,6,7,8,21,23,24,25,31]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[35,36,37]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[6,11,12,13,15,20,25,27,29,38]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[5,13,38]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[12,13]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,7,8,9,21,22,23,24,25,29,31,32]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[16,22,23,30,32]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[1,2,33]}],"complexes":["Gβ5-RGS7","Gβ5-RGS7-R7BP","GPR158-Gβ5-RGS7"],"partners":["GNB5","RGS7BP","GPR158","GNAO1","CAMK2A","ATF3","KAT5","SIRT1"],"other_free_text":[]},"mechanistic_narrative":"RGS7 is a GTPase-activating protein (GAP) for Gi/o-family Gα subunits that functions as an obligatory heterodimer with Gβ5 to terminate GPCR signaling and shape the kinetics of downstream effector channels in the nervous system. The GGL domain mediates Gβ5 binding, which reciprocally stabilizes both proteins against proteasomal degradation, while the RGS domain harbors intrinsic selectivity for Gαo over Gαi through a two-tier mechanism involving disruptor and modulatory residues [PMID:10942773, PMID:31153905]. Plasma membrane targeting—essential for GAP function—is achieved by palmitoylated R7BP or the orphan receptor GPR158, whose cryo-EM structures reveal that the DHEX domain of RGS7 docks to GPR158 intracellular loops while GPR158 allosterically enhances catalytic activity [PMID:15897264, PMID:34793198, PMID:25792749]. In hippocampal neurons, RGS7 accelerates GABAB-GIRK current deactivation to control neuronal excitability, learning, and memory; in the retina it cooperates with RGS11 to set the speed of mGluR6-mediated light responses; and in cardiac and hepatic contexts it forms non-canonical complexes with CaMKII, Tip60, SIRT1, and ATF3 that drive oxidative stress, NF-κB acetylation, and inflammation [PMID:24755289, PMID:22547806, PMID:36574707, PMID:35521658]."},"prefetch_data":{"uniprot":{"accession":"P49802","full_name":"Regulator of G-protein signaling 7","aliases":[],"length_aa":495,"mass_kda":57.7,"function":"GTPase activator component of the RGS7-GNB5 complex that regulates G protein-coupled receptor signaling cascades (PubMed:10521509, PubMed:10862767, PubMed:31189666). The RGS7-GNB5 complex acts as an inhibitor signal transduction by promoting the GTPase activity of G protein alpha subunits, such as GNAO1, thereby driving them into their inactive GDP-bound form (PubMed:10521509, PubMed:10862767). May play a role in synaptic vesicle exocytosis (Probable) (PubMed:12659861). Glycine-dependent regulation of the RGS7-GNB5 complex by GPR158 affects mood and cognition via its ability to regulate neuronal excitability in L2/L3 pyramidal neurons of the prefrontal cortex (By similarity). Modulates the activity of potassium channels that are activated by GNAO1 in response to muscarinic acetylcholine receptor M2/CHRM2 signaling (PubMed:15897264)","subcellular_location":"Cytoplasm, cytosol; Cytoplasm; Cell membrane; Membrane","url":"https://www.uniprot.org/uniprotkb/P49802/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RGS7","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RGS7","total_profiled":1310},"omim":[{"mim_id":"615004","title":"LEUCINE-RICH REPEAT, IMMUNOGLOBULIN-LIKE, AND TRANSMEMBRANE DOMAINS-CONTAINING PROTEIN 3; LRIT3","url":"https://www.omim.org/entry/615004"},{"mim_id":"610890","title":"REGULATOR OF G PROTEIN SIGNALING 7-BINDING PROTEIN; RGS7BP","url":"https://www.omim.org/entry/610890"},{"mim_id":"604447","title":"GUANINE NUCLEOTIDE-BINDING PROTEIN, BETA-5; GNB5","url":"https://www.omim.org/entry/604447"},{"mim_id":"603895","title":"REGULATOR OF G PROTEIN SIGNALING 11; RGS11","url":"https://www.omim.org/entry/603895"},{"mim_id":"602517","title":"REGULATOR OF G PROTEIN SIGNALING 7; RGS7","url":"https://www.omim.org/entry/602517"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"},{"location":"Mitochondria","reliability":"Additional"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"brain","ntpm":22.3}],"url":"https://www.proteinatlas.org/search/RGS7"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"P49802","domains":[{"cath_id":"1.10.10.10","chopping":"18-119","consensus_level":"medium","plddt":95.7506,"start":18,"end":119},{"cath_id":"1.10.167.10","chopping":"320-450","consensus_level":"high","plddt":96.526,"start":320,"end":450}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P49802","model_url":"https://alphafold.ebi.ac.uk/files/AF-P49802-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P49802-F1-predicted_aligned_error_v6.png","plddt_mean":85.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RGS7","jax_strain_url":"https://www.jax.org/strain/search?query=RGS7"},"sequence":{"accession":"P49802","fasta_url":"https://rest.uniprot.org/uniprotkb/P49802.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P49802/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P49802"}},"corpus_meta":[{"pmid":"10339594","id":"PMC_10339594","title":"Interaction between RGS7 and polycystin.","date":"1999","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/10339594","citation_count":143,"is_preprint":false},{"pmid":"10840031","id":"PMC_10840031","title":"Complexes of the G protein subunit gbeta 5 with the regulators of G protein signaling RGS7 and RGS9. 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Molecular basis of disease","url":"https://pubmed.ncbi.nlm.nih.gov/40086518","citation_count":1,"is_preprint":false},{"pmid":"34112017","id":"PMC_34112017","title":"Identification of Potential Modulators of the RGS7/Gβ5/R7BP Complex.","date":"2021","source":"SLAS discovery : advancing life sciences R & D","url":"https://pubmed.ncbi.nlm.nih.gov/34112017","citation_count":1,"is_preprint":false},{"pmid":"41169112","id":"PMC_41169112","title":"Molecular Mechanism of Dexmedetomidine in Alzheimer's Disease: Machine Learning Identifies RGS7 as a Key Therapeutic Targe.","date":"2025","source":"Chemical biology & drug design","url":"https://pubmed.ncbi.nlm.nih.gov/41169112","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.03.19.644198","title":"Pre- and postsynaptic mechanisms of neuronal inhibition assessed through biochemically detailed modelling of GABAB receptor signalling","date":"2025-03-19","source":"bioRxiv","url":"https://doi.org/10.1101/2025.03.19.644198","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":34211,"output_tokens":9490,"usd":0.122492},"stage2":{"model":"claude-opus-4-6","input_tokens":13338,"output_tokens":5044,"usd":0.289185},"total_usd":0.411677,"stage1_batch_id":"msgbatch_01SUR8NDzVrNmyszWyJeCct7","stage2_batch_id":"msgbatch_01G7Yfutko3cDWzejrwH5AMx","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"Gbeta5 forms a tight complex with RGS7 in the retina; the Ggamma-like (GGL) domain of RGS7 mediates binding to Gbeta5, and deletion of this domain prevents Gbeta5 binding while retaining Galpha interaction; Gbeta5 binding to RGS7 blocks RGS7 interaction with Galphao.\",\n      \"method\": \"Native protein purification from bovine retina, in vitro reconstitution with recombinant proteins, gel filtration, ion-exchange chromatography, immunoprecipitation, domain deletion mutagenesis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences / Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted in vitro, replicated across multiple labs and methods\",\n      \"pmids\": [\"9731233\", \"10051672\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"RGS7 is a short-lived protein degraded via the proteasome pathway; interaction with the C-terminal domain of polycystin (PKD1 gene product) inhibits proteasomal degradation of RGS7 and promotes its relocalization to the membrane.\",\n      \"method\": \"Proteasome inhibitor treatment, co-immunoprecipitation, subcellular localization by transfection/imaging\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (degradation assay, co-IP, localization) in single rigorous paper\",\n      \"pmids\": [\"10339594\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"TNF-alpha prevents proteasome-dependent degradation of RGS7 via activation of the stress-activated protein kinase p38, requiring candidate MAPK phosphorylation sites on RGS7; in vivo, RGS7 is rapidly upregulated in mouse brain after endotoxin or TNF-alpha exposure.\",\n      \"method\": \"Proteasome inhibitor assays, p38 kinase activation, site-directed mutagenesis of phosphorylation sites, in vivo mouse model with TNF receptor 1 knockout\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods including KO mouse model, kinase activation, and mutagenesis\",\n      \"pmids\": [\"10426315\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"The GGL domains of RGS6, RGS7, and RGS11 selectively bind Gbeta5 but not other Gbeta subunits; Phe-61 of Ggamma2, when mutated to tryptophan (the residue in GGL domains), increases Gbeta5/Ggamma2 heterodimer stability, revealing the structural basis of GGL/Gbeta5 specificity.\",\n      \"method\": \"Co-expression with different Gbeta subunits, immunoprecipitation, mutagenesis of Ggamma residues\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis with functional validation replicated across family members\",\n      \"pmids\": [\"10339615\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"RGS7 accelerates activation kinetics of GIRK channels similarly to RGS8, but its acceleration of deactivation is significantly weaker; RGS7 recombinant protein binds preferentially to Galphao, Galphai3, and Galphaz.\",\n      \"method\": \"Xenopus oocyte electrophysiology, co-expression of GIRK1/2 with RGS7, recombinant protein binding assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro electrophysiology and binding assays with defined functional readout\",\n      \"pmids\": [\"10092682\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Gbeta5 and RGS7 exist exclusively as obligatory heterodimers in brain; co-expression of Gbeta5 dramatically increases RGS7 protein levels (and vice versa) through a non-transcriptional mechanism based on increased protein stability upon dimerization; native Gbeta5-RGS7 does not co-purify with Galphao or Galphaq, yet Gbeta5-RGS7 inhibits Galphaq-mediated Ca2+ signaling in transfected cells.\",\n      \"method\": \"Immunoprecipitation, co-purification from brain, COS-7 cell co-expression, conventional chromatography, Ca2+ signaling assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP, chromatography, functional assay replicated across tissues and cells\",\n      \"pmids\": [\"10840031\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"RGS7 is palmitoylated on membrane-bound but not cytosolic fractions; palmitoylation does not prevent RGS7/Galphao interactions; the isolated RGS domain of RGS7 selectively binds activated Galpha(i/o) and stimulates GTPase activity; the RGS7/Gbeta5 complex selectively interacts with Galphao (not Galphai1), indicating Gbeta5 association restricts Galpha selectivity.\",\n      \"method\": \"Metabolic labeling with [3H]-palmitate, subcellular fractionation, in vitro GTPase assay, pulldown from brain extracts\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro GTPase assay and palmitoylation labeling with domain mutagenesis\",\n      \"pmids\": [\"11032900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"RGS7 RGS box domain (aa 305-453) enhances Galphao GTPase deactivation with catalytic efficiency of 0.44×10^6 M^-1s^-1, preferring Galphao over Galphai2 and Galphai1; specificity for Galphao resides in the RGS domain itself, independent of N- or C-terminal extensions or Gbeta5.\",\n      \"method\": \"Stopped-flow spectroscopy measuring intrinsic tryptophan fluorescence, GST-RGS domain fusion proteins, kinetic analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — rigorous in vitro kinetic assay with domain deletion analysis\",\n      \"pmids\": [\"10942773\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Gbeta5/RGS7 stimulates GTPase activity of Gi family Galpha subunits (but not Galphaq or Galpha11) in proteoliposomes; Gbeta5/RGS9 and Gbeta5/RGS11 are more potent GAPs for Galphai1/i2/i3 than Gbeta5/RGS7; Gbeta5/RGS7 and Gbeta5/RGS9 can inhibit Gbeta5/RGS11-stimulated GTPase activity of Galphao.\",\n      \"method\": \"Purified Sf9-derived proteins, steady-state GTPase assay in proteoliposomes with reconstituted receptor-G protein heterotrimers\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted in vitro GTPase assay with purified components\",\n      \"pmids\": [\"12531899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The Gbeta5-RGS7 complex interacts directly with Galphaq in living cells via FRET; this interaction occurs intracellularly and the complex inhibits Galphaq-mediated Ca2+ signaling.\",\n      \"method\": \"FRET spectroscopy and microscopy with YFP/CFP-tagged proteins in transfected mammalian cells, co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — FRET with orthogonal co-IP validation in living cells\",\n      \"pmids\": [\"12670932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"In C. elegans, RGS-7 (ortholog of vertebrate RGS7) localizes to the cell cortex and its RGS domain stimulates GTP hydrolysis by Galphao; RGS-7 completes a receptor-independent G protein cycle required for asymmetric mitotic spindle positioning, acting downstream of nonreceptor G protein activators RIC-8 and GPR-1/2.\",\n      \"method\": \"Genetic epistasis (C. elegans mutants), in vitro GTPase assay with recombinant RGS-7 and Galphao, live imaging of spindle movements\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution plus genetic epistasis in an ortholog\",\n      \"pmids\": [\"15479638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Galphao promotes palmitoylation and plasma membrane recruitment of Gbeta5-RGS7; constitutively active Galphao (R179C) retains this ability whereas lipidation-deficient (G2A), RGS-insensitive (G184S), and inactive (G204A) Galphao mutants do not; Cys133 of RGS7 is a putative palmitoylation site; the DEP domain (aa 76-128) of RGS7 is required for Galphao-mediated membrane recruitment.\",\n      \"method\": \"Subcellular fractionation, palmitoylation assay ([3H]-palmitate labeling), site-directed mutagenesis, immunofluorescence in HEK293 cells\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — metabolic labeling, mutagenesis, and fractionation with multiple Galpha mutants\",\n      \"pmids\": [\"15496508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"R7BP (RGS7 family binding protein), a palmitoylated neuronally expressed protein, binds R7-Gbeta5 complexes and shuttles them between the plasma membrane and nucleus; palmitoylation of R7BP targets it to the plasma membrane, and depalmitoylation translocates the R7BP-R7-Gbeta5 complex to the nucleus; plasma membrane-targeted R7BP greatly augments RGS7-mediated attenuation of GPCR-activated GIRK channel activation compared to non-palmitoylated R7BP.\",\n      \"method\": \"Palmitoylation assay, subcellular fractionation, live-cell imaging, GIRK electrophysiology in HEK293 cells, co-immunoprecipitation\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal methods including functional electrophysiology and palmitoylation assay\",\n      \"pmids\": [\"15897264\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"R7BP augments RGS7*Gbeta5 function exclusively through a palmitoylation-regulated plasma membrane-targeting mechanism; unpalmitoylated R7BP undergoes nuclear/cytoplasmic shuttling mediated by a C-terminal polybasic motif; cytoplasmic RGS7*Gbeta5*R7BP heterotrimers and RGS7*Gbeta5 heterodimers are equivalently inefficient GPCR signaling regulators.\",\n      \"method\": \"Mutagenesis of palmitoylation sites, nuclear export inhibitor treatment, GIRK electrophysiology, subcellular fractionation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis, functional electrophysiology, and fractionation\",\n      \"pmids\": [\"16867977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The DEP domain of RGS7 interacts intramolecularly with the Gbeta5 subunit; this DEP-Gbeta5 interaction is dynamic and produces closed/open conformational states of the Gbeta5-RGS7 dimer; R7BP binding has no effect on DEP-Gbeta5 pull-down; mutation of RGS7 Glu-73/Asp-74 to Ser/Gly (ED/SG) diminishes the DEP-Gbeta5 interaction and alters M3R signaling regulation in the presence of R7BP.\",\n      \"method\": \"GST pulldown, co-immunoprecipitation, FRET with CFP/YFP-tagged proteins, site-directed mutagenesis, Ca2+ mobilization assay\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — FRET, GST pulldown, mutagenesis, and functional assay\",\n      \"pmids\": [\"17511476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"RGS7/Gbeta5 complex is specifically targeted to the dendritic tips of ON-bipolar cells; this targeting occurs independently of R7BP association, revealing an adapter-independent targeting mechanism.\",\n      \"method\": \"In vivo mouse knockout of R7BP, immunofluorescence confocal microscopy of retinal sections\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO model with defined subcellular localization phenotype\",\n      \"pmids\": [\"18842904\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Intracellular administration of RGS7 via patch clamp electrodes into locus coeruleus neurons mimics chronic stress-induced decrease in alpha2-autoreceptor (clonidine-evoked) inhibition, demonstrating that elevated RGS7 reduces autoreceptor coupling.\",\n      \"method\": \"In vivo/in vitro single-unit recordings, patch-clamp intracellular RGS7 delivery, chronic cold stress model\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct intracellular protein delivery with electrophysiological readout, single lab\",\n      \"pmids\": [\"18461718\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The DEP domain of RGS7 directly binds the third intracellular loop (i3) of the M3 muscarinic receptor; the DEP domain alone is sufficient to inhibit M3R signaling; deletion of the i3 loop or DEP domain abolishes this inhibition; the C-terminus of M3R also interacts with Gbeta5-RGS7 and is required for inhibition of full-length receptor by wild-type (but not open-mutant) Gbeta5-RGS7.\",\n      \"method\": \"GST pulldown with recombinant i3 loop peptide, Ca2+ mobilization assay, domain deletion mutagenesis, truncation mutants\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro binding with GST-fused receptor domain plus functional cell-based assay and mutagenesis\",\n      \"pmids\": [\"19182865\", \"20443543\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"R7BP complexes differentially regulate RGS7 and RGS9-2 in the striatum; striatum-specific knockdown revealed that sensitivity of cocaine-induced motor stimulation depends on RGS7 (not RGS9-2), whose complex formation with R7BP is dictated by RGS9-2 expression levels.\",\n      \"method\": \"Striatum-specific RNAi knockdown in mice, locomotor behavior assays, biochemical analysis of complex formation\",\n      \"journal\": \"Neuropsychopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — region-specific KD with defined behavioral phenotype, single lab\",\n      \"pmids\": [\"20043004\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"R7BP undergoes dynamic, signal-regulated palmitate turnover; the palmitoyltransferase DHHC2 mediates de novo and turnover palmitoylation of R7BP; DHHC2 silencing redistributes R7BP from the plasma membrane to the nucleus; Gi/o signaling inhibits R7BP depalmitoylation, stabilizing membrane association of R7-Gbeta5 GAP complexes.\",\n      \"method\": \"[3H]-palmitate metabolic labeling, DHHC2 siRNA silencing, subcellular fractionation, pertussis toxin treatment\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — metabolic labeling with specific enzyme knockdown and fractionation\",\n      \"pmids\": [\"21343290\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"GPR158 and GPR179 recruit RGS7 complexes to the plasma membrane and augment their ability to regulate GPCR signaling; loss of GPR179 in a mouse model of night blindness prevents targeting of RGS7 complex to the postsynaptic compartment of retinal bipolar neurons.\",\n      \"method\": \"Co-immunoprecipitation, subcellular fractionation, mouse KO model, electroretinography, immunofluorescence\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP, KO mouse model, functional ERG, and localization\",\n      \"pmids\": [\"22689652\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RGS7 and RGS11 are the key GTPase-activating proteins in the mGluR6 pathway of retinal rod ON bipolar cells; concurrent elimination of both RGS7 and RGS11 severely reduces the magnitude and dramatically slows onset of light-evoked responses, consistent with persistently high G protein activity.\",\n      \"method\": \"RGS7/RGS11 single and double knockout mice, electroretinography, single-cell patch-clamp recordings\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — double KO genetic epistasis with electrophysiological readout\",\n      \"pmids\": [\"22547806\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RGS7/Gbeta5 forms macromolecular complexes with GABAB receptors and GIRK channels in hippocampal CA1 pyramidal neurons; co-expression of RGS7/Gbeta5 markedly accelerates GABAB-GIRK current deactivation kinetics; by immunoelectron microscopy, RGS7/Gbeta5 is enriched around excitatory synapses on dendritic spines in proximity to Girk2 and GABAB1.\",\n      \"method\": \"Co-immunoprecipitation, patch-clamp electrophysiology, immunoelectron microscopy\",\n      \"journal\": \"Hippocampus\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP, electrophysiology, and ultrastructural localization\",\n      \"pmids\": [\"23804514\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RGS7, in cooperation with R7BP, regulates GABABR-GIRK signaling in hippocampal pyramidal neurons; deletion of RGS7 in mice dramatically sensitizes GIRK responses to GABAB receptor stimulation and markedly slows channel deactivation kinetics; R7BP sets the dynamic range of GIRK responses; RGS7 loss leads to decreased neuronal excitability and deficits in inhibitory synaptic plasticity, learning, and memory.\",\n      \"method\": \"RGS7 knockout mice, whole-cell patch-clamp electrophysiology in hippocampal slices, behavioral testing (learning/memory)\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse with electrophysiology and behavioral readouts, replicated with R7BP manipulation\",\n      \"pmids\": [\"24755289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Gbeta5-RGS7 suppresses M3R-stimulated Ca2+ release from intracellular stores but also independently enhances Ca2+ influx via a nifedipine-sensitive channel; the enhanced Ca2+ influx effect is independent of RGS7 GTPase-accelerating protein activity and involves a Gq-mediated pathway.\",\n      \"method\": \"Ca2+ imaging with selective channel blockers (nifedipine, 2-APB), pertussis toxin, RGS domain-deficient mutant, Gq inhibitor UBO-QIC\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — pharmacological dissection with multiple orthogonal inhibitors and RGS domain mutant\",\n      \"pmids\": [\"24586057\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"GPR158 is essential for RGS7 expression and membrane localization in the brain (GPR158 KO causes post-transcriptional destabilization of RGS7); the RGS7-binding site maps to the C terminus of GPR158 with homology to R7BP; the proximal GPR158 C terminus enhances RGS7 GAP activity by an allosteric mechanism; the distal GPR158 C terminus contains PDE E-gamma-like motifs that selectively recruit activated G proteins.\",\n      \"method\": \"GPR158 knockout mice, Western blot/fractionation, in vitro GTPase assay, domain mutagenesis, co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse plus in vitro GAP assay and domain mapping\",\n      \"pmids\": [\"25792749\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RGS7 can form homo-oligomers in mouse brain and transfected cells; self-association requires the DEP domain but not the RGS or DHEX domains; R7BP strongly inhibits RGS7 homo-oligomerization; constitutively active Galphao prevents RGS7-RGS7 interaction; GPR158 can bind the RGS7 homo-oligomer without causing its dissociation.\",\n      \"method\": \"In situ chemical cross-linking, mass spectrometry, co-immunoprecipitation of differentially tagged RGS7, KO mouse tissue\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cross-linking plus mass spectrometry and co-IP with domain mutagenesis\",\n      \"pmids\": [\"26895961\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RGS7/Gbeta5/R7BP complexes localize to the extrasynaptic plasma membrane of dendritic shafts and spines of cerebellar Purkinje cells; R7BP deletion in mice reduces targeting of both RGS7 and Gbeta5 to the plasma membrane in cerebellum.\",\n      \"method\": \"Co-immunoprecipitation, immunohistochemistry, immunoelectron microscopy, R7BP KO mouse model\",\n      \"journal\": \"Frontiers in neuroanatomy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse with ultrastructural localization and co-IP\",\n      \"pmids\": [\"27965545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Crystal structure of the RGS7-Gbeta5-R7BP complex reveals unique organizational features including long-range conformational changes during allosteric modulation; intermolecular interfaces act in synergy for coordinated modulation of GAP activity.\",\n      \"method\": \"X-ray crystallography, molecular dynamics simulation, hydrogen-deuterium exchange mass spectrometry\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with MD and MS validation\",\n      \"pmids\": [\"30540250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Hippocampal RGS7 forms two distinct complexes with alternative subunit configurations bound to either R7BP or GPR158; both complexes target nearly the entire pool of RGS7 to the plasma membrane; only R7BP-containing complexes (not GPR158-containing complexes) accelerate GIRK and CaV2 channel kinetics modulated by GABABRs; GPR158 overexpression inhibits RGS7-assisted temporal modulation.\",\n      \"method\": \"Quantitative biochemistry (co-IP, fractionation), patch-clamp electrophysiology in cultured neurons and brain slices, genetic KO and overexpression in mice\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO, overexpression, quantitative biochemistry, and electrophysiology\",\n      \"pmids\": [\"30315127\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Chronic stress promotes membrane recruitment of RGS7 via GPR158 in the medial prefrontal cortex; the resultant GPR158-RGS7 complex suppresses homeostatic cAMP regulation by inhibitory GPCRs; RGS7 loss in mice induces antidepressant-like phenotype; restoration of RGS7 within mPFC rescues the phenotype in a GPR158-dependent manner.\",\n      \"method\": \"Mouse KO and viral RGS7 re-expression, biochemical fractionation, cAMP measurement, behavioral assays\",\n      \"journal\": \"Neuropsychopharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO plus region-specific rescue with GPR158-dependent requirement\",\n      \"pmids\": [\"30546127\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The RGS domains of RGS6 and RGS7 alone are sufficient for Galphao vs. Galphai1 selectivity; three 'disruptor residues' in the RGS6/7 domains non-specifically attenuate RGS-Galpha interactions, while a unique 'modulatory' residue bypasses this inhibitory effect specifically toward Galphao, constituting a two-tier selectivity mechanism.\",\n      \"method\": \"In vitro GTPase assay, site-directed mutagenesis of RGS domain residues, computational structural modeling\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro GTPase assay with systematic mutagenesis\",\n      \"pmids\": [\"31153905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The GPR158-RGS7 complex controls A-type potassium channel (Kv4.2) function in L2/3 pyramidal neurons of the PFC; GPR158 physically associates with Kv4.2 and promotes its function by suppressing inhibitory cAMP-PKA-mediated phosphorylation; deletion of GPR158 or RGS7 enhances excitability of these neurons and prevents stress-induced decreases in excitability.\",\n      \"method\": \"Co-immunoprecipitation (GPR158-Kv4.2), KO mouse models, patch-clamp electrophysiology, cAMP/PKA pathway pharmacology\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP with KO mice, electrophysiology, and pharmacological pathway dissection\",\n      \"pmids\": [\"31311860\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Arginyltransferase (Ate1) facilitates proteasomal degradation of RGS7; deletion of Ate1 in the nervous system raises RGS7 levels in retinal ON bipolar cells and increases light-evoked response sensitivities; RGS7 degradation via proteasome is abolished in Ate1 knockout mouse embryonic fibroblasts.\",\n      \"method\": \"Conditional Ate1 KO mouse, electroretinography, proteasome inhibition assay in MEF cells, Western blot\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with functional ERG and biochemical proteasome assay\",\n      \"pmids\": [\"33931669\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cryo-EM structure of human GPR158 alone and bound to RGS7-Gbeta5 reveals: GPR158 dimerizes through PAS-fold extracellular and transmembrane domains stabilized by phospholipids; the DHEX domain of RGS7 docks to ICL2, ICL3, TM3 and first coiled-coil helix of GPR158; a second RGS7 molecule is recruited by the second coiled-coil helix; unique features of the RGS7-binding site underlie selectivity of GPR158 for RGS7.\",\n      \"method\": \"Single-particle cryo-EM structure determination\",\n      \"journal\": \"Science / Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structures independently solved by two groups\",\n      \"pmids\": [\"34793198\", \"34815401\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RGS7 forms a complex with CaMKII in ventricular cardiomyocytes, supported by key residues K412 and P391 in the RGS domain; RGS7 facilitates CaMKII oxidation, phosphorylation, and CaMKII-dependent oxidative stress and apoptosis following chemotherapy; cardiac-specific RGS7 knockdown protects against doxorubicin cardiotoxicity; RGS7 also drives neuregulin-1 secretion mediating paracrine VCM-EC communication.\",\n      \"method\": \"Co-immunoprecipitation (RGS7-CaMKII), site-directed mutagenesis (K412, P391), cardiac-specific KD/OE in mice, CaMKII oxidation/phosphorylation assays, ROS measurement\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP with mutagenesis, cardiac-specific KD/OE with defined mechanistic readouts\",\n      \"pmids\": [\"36574707\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In the liver, RGS7 forms a complex with transcription factor ATF3 and histone acetyltransferase Tip60; this complex drives TNFα release from hepatocytes and stellate cells; removal of domains necessary for ATF3/Tip60 binding abolishes RGS7-dependent ROS generation and cell death; hepatic RGS7 knockdown protects against NAFLD-associated fibrosis and inflammation.\",\n      \"method\": \"Co-immunoprecipitation (RGS7-ATF3-Tip60), domain deletion mutagenesis, hepatic RGS7 KD in mice (shRNA), high-fat diet model, TNFα ELISA\",\n      \"journal\": \"Antioxidants & redox signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP with domain mutagenesis, in vivo KD with defined functional readouts\",\n      \"pmids\": [\"35521658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"RGS7 forms a complex with acetyltransferase Tip60 and deacetylase SIRT1 in ventricular cardiomyocytes; this complex controls acetylation of the p65 subunit of NF-kB, driving pro-inflammatory signaling; Tip60 inhibition or SIRT1 activation mitigates RGS7-driven cardiac inflammation.\",\n      \"method\": \"Co-immunoprecipitation (RGS7-Tip60-SIRT1), acetylation status assay of p65, Tip60 inhibitor/SIRT1 activator treatment, cardiac RGS7 OE in mice\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP with pharmacological intervention and defined biochemical readout\",\n      \"pmids\": [\"37589751\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RGS7 concentrates at the plasma membrane of cell bodies, along processes in lamellipodia/filopodia-like structures, and at dendritic tips in retinal and dorsal root ganglion neurons; at the plasma membrane, RGS7 co-localizes with R7BP, Galphao, and Galphaq; punctate cytoplasmic localization is mediated by the DEP/DHEX domains; centrosomal localization is mediated by the DHEX domain.\",\n      \"method\": \"Immunofluorescence confocal microscopy of native neurons and transfected cell lines, domain deletion analysis\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — localization with domain mutagenesis but limited functional consequence established\",\n      \"pmids\": [\"22640015\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RGS7 functions as a GTPase-activating protein (GAP) selective for Gi/o family Galpha subunits (especially Galphao), always existing in vivo as an obligatory heterodimer with Gbeta5 via its GGL domain; this core Gbeta5-RGS7 dimer is recruited to the plasma membrane by palmitoylated R7BP or orphan receptor GPR158, which control its localization, stability, and catalytic activity through allosteric mechanisms; the DEP domain mediates receptor subtype selectivity (e.g., M3R) through direct interaction with intracellular loops, and the complex is regulated by reversible palmitoylation, proteasomal degradation (facilitated by arginyltransferase Ate1 and inhibited by polycystin/TNF-alpha/p38 signaling), homo-oligomerization, and non-canonical interactions with CaMKII, Tip60/SIRT1, and ATF3 in cardiac and hepatic contexts.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"RGS7 is a GTPase-activating protein (GAP) for Gi/o-family Gα subunits that functions as an obligatory heterodimer with Gβ5 to terminate GPCR signaling and shape the kinetics of downstream effector channels in the nervous system. The GGL domain mediates Gβ5 binding, which reciprocally stabilizes both proteins against proteasomal degradation, while the RGS domain harbors intrinsic selectivity for Gαo over Gαi through a two-tier mechanism involving disruptor and modulatory residues [PMID:10942773, PMID:31153905]. Plasma membrane targeting—essential for GAP function—is achieved by palmitoylated R7BP or the orphan receptor GPR158, whose cryo-EM structures reveal that the DHEX domain of RGS7 docks to GPR158 intracellular loops while GPR158 allosterically enhances catalytic activity [PMID:15897264, PMID:34793198, PMID:25792749]. In hippocampal neurons, RGS7 accelerates GABAB-GIRK current deactivation to control neuronal excitability, learning, and memory; in the retina it cooperates with RGS11 to set the speed of mGluR6-mediated light responses; and in cardiac and hepatic contexts it forms non-canonical complexes with CaMKII, Tip60, SIRT1, and ATF3 that drive oxidative stress, NF-κB acetylation, and inflammation [PMID:24755289, PMID:22547806, PMID:36574707, PMID:35521658].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Identification of Gβ5 as an obligate partner resolved how R7-family RGS proteins differ from other RGS proteins: the GGL domain of RGS7 mediates a tight, specific complex with Gβ5, and this interaction modulates Gαo binding.\",\n      \"evidence\": \"Native purification from bovine retina, in vitro reconstitution, domain deletion mutagenesis\",\n      \"pmids\": [\"9731233\", \"10051672\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Gβ5 binding inhibits or redirects GAP activity in vivo was unresolved\", \"Structural basis of GGL-Gβ5 interface not yet determined\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Discovery that RGS7 is a short-lived proteasomal substrate whose stability is regulated by polycystin (PKD1) and by TNF-α/p38 MAPK signaling established protein turnover as a major regulatory axis controlling RGS7 abundance in vivo.\",\n      \"evidence\": \"Proteasome inhibitor assays, p38 kinase activation, PKD1 co-IP, TNF receptor 1 KO mice\",\n      \"pmids\": [\"10339594\", \"10426315\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct phosphorylation sites on RGS7 responsible for p38-mediated stabilization not fully mapped\", \"Relationship between polycystin and Gβ5-mediated stabilization unclear\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Functional characterization of RGS7 in GIRK channel modulation and Gα binding specificity showed it accelerates channel activation but is a weaker deactivation accelerator than RGS8, with preferential binding to Gαo, Gαi3, and Gαz.\",\n      \"evidence\": \"Xenopus oocyte GIRK electrophysiology, recombinant protein binding assay\",\n      \"pmids\": [\"10092682\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why deactivation acceleration is weaker than other RGS proteins was mechanistically unexplained\", \"Contribution of Gβ5 to channel kinetics not tested\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Demonstration that Gβ5 and RGS7 exist exclusively as obligatory heterodimers in brain, with mutual stabilization preventing proteasomal degradation, established the dimer as the functional unit; palmitoylation of RGS7 was linked to membrane association, and the isolated RGS domain confirmed intrinsic Gαo selectivity.\",\n      \"evidence\": \"Brain co-purification, co-expression stability assays, [³H]-palmitate labeling, stopped-flow GTPase kinetics\",\n      \"pmids\": [\"10840031\", \"11032900\", \"10942773\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the palmitoyl transferase unknown\", \"Whether Gβ5 restricts or refines Gα selectivity in native neurons untested\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Reconstituted proteoliposome assays and live-cell FRET established that Gβ5-RGS7 functions as a GAP for Gi family (not Gq/G11) subunits in a lipid bilayer context, while also physically interacting with Gαq in cells to inhibit Gq-mediated calcium signaling.\",\n      \"evidence\": \"Proteoliposome GTPase assay with purified proteins, FRET with YFP/CFP-tagged proteins, Ca²⁺ assay\",\n      \"pmids\": [\"12531899\", \"12670932\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of Gαq inhibition without classical GAP activity for Gq unclear\", \"Relative importance of Gi vs Gq regulation in native neurons unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"The C. elegans ortholog RGS-7 was placed into a receptor-independent Gαo GTPase cycle that controls asymmetric spindle positioning, revealing a conserved non-canonical role for the RGS7 family beyond GPCR signal termination; concurrently, Gαo was shown to promote RGS7 palmitoylation and membrane recruitment via the DEP domain.\",\n      \"evidence\": \"Genetic epistasis in C. elegans, in vitro GTPase assay, mutagenesis of palmitoylation and DEP domain residues in HEK293 cells\",\n      \"pmids\": [\"15479638\", \"15496508\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether spindle-positioning function is conserved in vertebrates untested\", \"Palmitoyl transferase identity still unknown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Discovery of R7BP as a palmitoylated membrane anchor resolved how cytosolic Gβ5-RGS7 reaches the plasma membrane to regulate GPCRs: palmitoylated R7BP targets the complex to the membrane and dramatically augments GIRK regulation, while depalmitoylation drives nuclear translocation.\",\n      \"evidence\": \"Palmitoylation assay, live-cell imaging, GIRK electrophysiology, subcellular fractionation\",\n      \"pmids\": [\"15897264\", \"16867977\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Nuclear function of depalmitoylated R7BP-RGS7 complex unknown\", \"Enzyme mediating R7BP depalmitoylation not identified\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Intramolecular DEP-Gβ5 interaction revealed a conformational switch (open/closed states) that gates receptor subtype selectivity; direct binding of the DEP domain to the M3R third intracellular loop established the first mechanism by which an RGS protein recognizes a specific receptor.\",\n      \"evidence\": \"FRET, GST pulldown with receptor i3 loop, site-directed mutagenesis, Ca²⁺ mobilization assay\",\n      \"pmids\": [\"17511476\", \"19182865\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other GPCRs are similarly recognized by the DEP domain unknown\", \"Structural basis of DEP-receptor interaction not determined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identification of DHHC2 as the palmitoyltransferase for R7BP, with Gi/o signaling inhibiting depalmitoylation, established a feedback loop: active Gi/o stabilizes the membrane GAP complex that terminates its own signaling.\",\n      \"evidence\": \"[³H]-palmitate metabolic labeling, DHHC2 siRNA, subcellular fractionation, pertussis toxin\",\n      \"pmids\": [\"21343290\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the thioesterase mediating R7BP depalmitoylation unknown\", \"Whether this feedback operates in all neuronal subtypes untested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Discovery that orphan receptors GPR158 and GPR179 serve as alternative membrane anchors for RGS7 complexes explained R7BP-independent membrane targeting in retina; GPR179 loss causes night blindness by mislocalizing RGS7, and concurrent RGS7/RGS11 knockout severely impairs rod ON bipolar cell light responses.\",\n      \"evidence\": \"Co-IP, KO mouse models (GPR179, RGS7, RGS11), electroretinography, patch-clamp\",\n      \"pmids\": [\"22689652\", \"22547806\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether GPR158 vs GPR179 confer distinct functional properties to the complex was unresolved\", \"Mechanism by which GPR158/179 selectivity for specific R7-family members arises unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Hippocampal RGS7 knockout demonstrated that RGS7 is the dominant GAP controlling GABAB-GIRK signaling kinetics in CA1 pyramidal neurons: its loss sensitizes GIRK responses, slows deactivation, reduces excitability, and impairs learning and memory.\",\n      \"evidence\": \"RGS7 KO mice, whole-cell patch-clamp in hippocampal slices, behavioral testing\",\n      \"pmids\": [\"24755289\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contributions of R7BP vs GPR158 complexes to hippocampal function unclear\", \"Whether RGS7 loss affects other hippocampal GPCR-effector pathways untested\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"GPR158 was established as essential for brain RGS7 expression and membrane localization: GPR158 knockout causes post-transcriptional loss of RGS7, and GPR158's C-terminus allosterically enhances RGS7 GAP activity through a mechanism distinct from simple membrane anchoring.\",\n      \"evidence\": \"GPR158 KO mice, in vitro GTPase assay, domain mutagenesis, co-IP\",\n      \"pmids\": [\"25792749\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signal that activates GPR158 unknown (orphan receptor)\", \"Whether allosteric enhancement involves conformational change in RGS domain untested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"RGS7 homo-oligomerization via the DEP domain was discovered as a new regulatory mechanism: R7BP inhibits and active Gαo prevents oligomerization, while GPR158 can accommodate the oligomer, suggesting context-dependent quaternary structure regulation.\",\n      \"evidence\": \"In situ cross-linking, mass spectrometry, co-IP of differentially tagged RGS7\",\n      \"pmids\": [\"26895961\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of homo-oligomerization on GAP activity unknown\", \"Stoichiometry and structure of the oligomer not determined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Crystal structure of the RGS7-Gβ5-R7BP ternary complex revealed the structural basis of allosteric regulation, with long-range conformational changes linking the R7BP binding site to the catalytic RGS domain through synergistic intermolecular interfaces.\",\n      \"evidence\": \"X-ray crystallography, hydrogen-deuterium exchange mass spectrometry, molecular dynamics\",\n      \"pmids\": [\"30540250\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure with Gα substrate not captured\", \"How DEP domain conformational switching maps onto the crystal structure unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Functional dissection of hippocampal R7BP- vs GPR158-containing complexes revealed that only R7BP-complexes accelerate GIRK and CaV2 channel kinetics, whereas GPR158-complexes serve a distinct role in chronic stress-induced suppression of cAMP signaling in prefrontal cortex, with RGS7 loss producing antidepressant-like phenotypes.\",\n      \"evidence\": \"KO mice, quantitative biochemistry, patch-clamp in slices, behavioral assays, viral re-expression\",\n      \"pmids\": [\"30315127\", \"30546127\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ligand for GPR158 that triggers stress-dependent RGS7 recruitment unknown\", \"Circuit-level mechanisms connecting RGS7-mediated cAMP regulation to depression behavior unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"A two-tier selectivity mechanism was elucidated: three 'disruptor' residues in the RGS domain non-specifically attenuate Gα interaction, while a unique 'modulatory' residue bypasses this inhibition specifically toward Gαo, explaining the longstanding Gαo preference.\",\n      \"evidence\": \"Systematic site-directed mutagenesis, in vitro GTPase assay\",\n      \"pmids\": [\"31153905\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this selectivity mechanism is overridden by accessory subunits in vivo untested\", \"No crystal structure of RGS7 RGS domain bound to Gαo\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Cryo-EM structures of GPR158 alone and in complex with RGS7-Gβ5 revealed the unique architecture: GPR158 dimerizes via PAS-fold and TM domains stabilized by phospholipids, and the DHEX domain of RGS7 docks to ICL2/ICL3/TM3 of GPR158, explaining receptor selectivity for RGS7.\",\n      \"evidence\": \"Single-particle cryo-EM, independently solved by two groups\",\n      \"pmids\": [\"34793198\", \"34815401\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conformational changes upon G protein engagement not captured\", \"Whether phospholipid identity regulates complex assembly unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Arginyltransferase Ate1 was identified as a facilitator of RGS7 proteasomal degradation, establishing an N-end rule-like pathway; Ate1 knockout elevates RGS7 in retinal ON bipolar cells and increases light sensitivity.\",\n      \"evidence\": \"Conditional Ate1 KO mouse, electroretinography, proteasome inhibition in MEFs\",\n      \"pmids\": [\"33931669\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Ate1 directly arginylates RGS7 or acts indirectly unknown\", \"Relationship between Ate1 and Gβ5/GPR158-mediated stabilization unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Non-canonical roles were established in cardiac and hepatic tissues: RGS7 complexes with CaMKII to promote oxidative stress and doxorubicin cardiotoxicity, and with ATF3/Tip60 to drive TNFα release and NAFLD-associated fibrosis, expanding RGS7 function beyond classical GPCR-GAP activity.\",\n      \"evidence\": \"Co-IP with mutagenesis, cardiac/hepatic-specific KD/OE in mice, ROS and cytokine assays, high-fat diet model\",\n      \"pmids\": [\"36574707\", \"35521658\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CaMKII and ATF3/Tip60 interactions require Gβ5 unknown\", \"GAP-dependent vs GAP-independent contributions not fully separated in vivo\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"RGS7 was found to scaffold Tip60 and SIRT1 in cardiomyocytes, controlling acetylation of NF-κB p65 to drive inflammation; pharmacological modulation of this axis mitigated cardiac damage.\",\n      \"evidence\": \"Co-IP (RGS7-Tip60-SIRT1), p65 acetylation assay, Tip60 inhibitor/SIRT1 activator, cardiac RGS7 OE mice\",\n      \"pmids\": [\"37589751\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How RGS7 simultaneously engages both Tip60 and SIRT1 structurally is unknown\", \"Whether this scaffolding is relevant in non-cardiac tissues untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the endogenous ligand for GPR158 that regulates RGS7 membrane recruitment under stress; whether non-canonical cardiac/hepatic scaffolding functions require Gβ5 and/or GAP activity; and the structural basis of DEP domain-GPCR recognition.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"GPR158 ligand identity unknown\", \"No structure of RGS7 DEP domain bound to a receptor intracellular loop\", \"GAP-dependent vs GAP-independent roles not genetically separated in cardiac/hepatic contexts\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [4, 6, 7, 8, 21, 23, 24, 25, 31]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [35, 36, 37]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [6, 11, 12, 13, 15, 20, 25, 27, 29, 38]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [5, 13, 38]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [12, 13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 7, 8, 9, 21, 22, 23, 24, 25, 29, 31, 32]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [16, 22, 23, 30, 32]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [1, 2, 33]}\n    ],\n    \"complexes\": [\n      \"Gβ5-RGS7\",\n      \"Gβ5-RGS7-R7BP\",\n      \"GPR158-Gβ5-RGS7\"\n    ],\n    \"partners\": [\n      \"GNB5\",\n      \"RGS7BP\",\n      \"GPR158\",\n      \"GNAO1\",\n      \"CAMK2A\",\n      \"ATF3\",\n      \"KAT5\",\n      \"SIRT1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}