{"gene":"RGS2","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":1997,"finding":"RGS2 is a selective and potent inhibitor of Gqα function. RGS2 selectively binds Gqα but not Giα, Goα, Gsα, or G12/13α in brain membranes and in pulldown assays with purified recombinant proteins. RGS2 does not stimulate the GTPase activities of Gsα or Giα family members even at concentrations 3000-fold higher than those sufficient for RGS4 effects on Giα. When reconstituted with phospholipid vesicles, RGS2 is 10-fold more potent than RGS4 in blocking Gqα-directed activation of PLCβ1.","method":"Pulldown binding assays (brain membranes and purified recombinant proteins), in vitro GTPase assay, phospholipid vesicle reconstitution with PLCβ1 activation assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified proteins, GTPase assay, and functional PLCβ1 assay; founding mechanistic paper replicated across multiple subsequent studies","pmids":["9405622"],"is_preprint":false},{"year":1998,"finding":"RGS2 stimulates the GTPase activity of Gqα and Gi1α in biochemical assays. The effect on Gi1 was observed only after reconstitution in phospholipid vesicles containing M2 muscarinic acetylcholine receptors. RGS2 also inhibits both Gq- and Gi-dependent responses in transfected cells.","method":"In vitro GTPase assay, phospholipid vesicle reconstitution with M2 muscarinic receptor, transfection-based functional signaling assays","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstituted GTPase assay with multiple orthogonal methods (biochemical and cell-based), single lab","pmids":["9736641"],"is_preprint":false},{"year":1999,"finding":"RGS2 function is governed by quantitative differences in potency toward Gq vs Gi family members: RGS2 is 5-fold more potent than RGS4 as an inhibitor of Gq-stimulated phosphoinositide hydrolysis in vivo, whereas RGS4 is 8-fold more potent than RGS2 as an inhibitor of Gi-mediated signaling. RGS2 mutants were identified that display increased potency toward Gi family members without affecting potency toward Gq, mapping to the switch I binding pocket geometry and the α8–α9 loop interacting with αA of Gi class α subunits.","method":"Cell-based phosphoinositide hydrolysis assay, RGS2 mutational analysis, structural inference from RGS4–Giα1 crystal structure","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — mutagenesis with functional readouts and structural context; single lab, multiple orthogonal methods","pmids":["10567399"],"is_preprint":false},{"year":2000,"finding":"PKC phosphorylates RGS2 in vitro to near-stoichiometric levels using both a mixture of PKC isozymes and individual calcium/phospholipid-dependent PKC isoforms. RGS2 is also phosphorylated in intact COS7 cells in response to PKC activation by PMA and, to a lesser extent, by the P2Y2 receptor agonist UTP. In vitro phosphorylation of RGS2 by PKC decreased its capacity to attenuate GTP- and GTPγS-stimulated PLCβ activation, and the extent of inhibition correlated with RGS2 phosphorylation level. A phosphorylation-dependent inhibition of RGS2 GAP activity was also observed in proteoliposomes reconstituted with purified P2Y1 receptor and Gqαβγ.","method":"In vitro kinase assay with purified PKC, 32P labeling in intact COS7 cells, proteoliposome reconstitution assay, PLCβ activation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay plus reconstitution in proteoliposomes plus cellular phosphorylation, single lab, multiple orthogonal methods","pmids":["11063746"],"is_preprint":false},{"year":2001,"finding":"RGS2 contains a conserved N-terminal amphipathic α-helix domain that is necessary and sufficient for plasma membrane localization. This domain binds vesicles containing acidic phospholipids. Activated Gq increases RGS2 association with the plasma membrane and decreases its nuclear accumulation. The RGS2 N terminus directs nuclear accumulation of GFP and enters the nucleus by passive diffusion despite possessing a nuclear targeting motif but lacking a nuclear import signal. Excluding RGS2 from the nucleus did not affect its ability to attenuate Gq signaling.","method":"GFP-fusion live-cell confocal microscopy, liposome binding assay, mutational analysis, truncation constructs, fluorescence/CD biophysical analysis of the amphipathic helix","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct localization experiments with functional consequences tested, multiple mutants, biophysical validation, single lab","pmids":["11278586"],"is_preprint":false},{"year":2003,"finding":"RGS2 directly inhibits the activity of type V adenylyl cyclase (AC) by binding to its C1 domain (not C2 domain). The interaction requires the N-terminal 19 amino acids of RGS2; the C terminus, RGS GAP activity, and RGS box domain are not required. Alanine scanning of the N terminus identified three residues essential for AC inhibition. This inhibition of cAMP accumulation is independent of Giα inhibition.","method":"Co-immunoprecipitation, deletion mutagenesis, alanine scanning mutagenesis, cAMP accumulation assay in HEK293 cells expressing type V AC","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple mutagenesis strategies with direct binding domain mapping, cAMP functional assay, single lab","pmids":["12604604"],"is_preprint":false},{"year":2003,"finding":"GFP-RGS2 localizes to the nucleus in HEK293 cells and is selectively recruited to the plasma membrane when co-expressed with Gαs, β2-adrenergic receptor, Gαq, or AT1A angiotensin II receptor, but not by Gi-coupled receptors or G protein mutants with reduced RGS affinity. This recruitment involves direct binding to G proteins and is independent of downstream signaling events. RGS2 inhibited Gs-dependent increases in intracellular cAMP, consistent with its selective recruitment by Gs.","method":"GFP-tagged RGS2 confocal microscopy, co-expression with wild-type and mutant Gα subunits and GPCRs, steady-state Gi GTPase activity assay, cAMP accumulation assay","journal":"Molecular pharmacology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — direct localization experiments with G protein mutant controls and functional signaling readouts, single lab","pmids":["12920194"],"is_preprint":false},{"year":2004,"finding":"RGS2 binds directly and selectively to the third intracellular (i3) loop of the M1 muscarinic acetylcholine receptor (M1 mAChR). The N-terminal region of RGS2 is both necessary and sufficient for binding to M1i3. RGS2 forms a stable heterotrimeric complex with activated Gqα and M1i3. Deletion of the N terminus abolishes RGS2 effector antagonist activity but not its GAP activity toward G11α. RGS2 and M1 mAChR co-localize at the plasma membrane. Closely related RGS16 does not bind M1i3, and neither protein binds M2i3.","method":"GST pulldown (in vitro binding), co-localization by fluorescence microscopy, phosphoinositide hydrolysis assay in cell membranes, N-terminal deletion constructs, co-immunoprecipitation of ternary complex","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct in vitro binding plus cellular co-localization plus functional assay plus mutagenesis, replicated across multiple receptor subtypes","pmids":["14976183"],"is_preprint":false},{"year":2005,"finding":"The scaffold protein spinophilin (SPL) binds the N-terminal domain of RGS2 and also binds the third intracellular loop (3iL) of several GPCRs including the α-adrenergic receptor (αAR). When expressed in Xenopus oocytes, SPL markedly increased RGS2 inhibition of αAR Ca2+ signaling. A constitutively active αAR mutant (A293E) in the 3iL did not bind SPL and was relatively resistant to RGS2 inhibition. In rgs2−/− cells, αAR-evoked Ca2+ signaling is less sensitive to SPL inhibition, and in spl−/− cells less sensitive to RGS2 inhibition.","method":"Co-immunoprecipitation, GST pulldown, Xenopus oocyte electrophysiology/Ca2+ assay, αAR–βAR chimeras, knockout cell assays","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, functional rescue experiments in oocytes, double-knockout cell assays, multiple orthogonal methods","pmids":["15793568"],"is_preprint":false},{"year":2005,"finding":"RGS2 binds directly and selectively to the third intracellular loop of the α1A-adrenergic receptor (α1A-AR) in vitro and is recruited by the unstimulated α1A-AR to the plasma membrane in cells to inhibit Gq/11 signaling. The N terminus of RGS2 is required for this interaction. Residues Lys219, Ser220, and Arg238 within the α1A-AR i3 loop are essential. RGS2 does not interact with the highly homologous α1B- or α1D-ARs, and RGS16 does not interact with any α1-AR.","method":"GST pulldown (in vitro), confocal fluorescence imaging of RGS2 recruitment, phosphoinositide hydrolysis assay, site-directed mutagenesis of receptor i3 loop","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct binding plus cellular imaging plus functional assay plus mutagenesis, single lab, multiple orthogonal methods","pmids":["15917235"],"is_preprint":false},{"year":2005,"finding":"RGS2 interacts with Gsα and adenylyl cyclase (AC) isoforms in living cells. Co-expression of AC isoforms (ACI, ACII, ACV, ACVI) recruits GFP-RGS2 to the plasma membrane. BRET signals were detected between RGS2-Rluc and Gsα-GFP, and between GFP-RGS2 and ACII-Rluc or ACVI-Rluc. Purified RGS2 selectively bound the third intracellular loop of the β2-AR in GST pulldown, and a BRET signal between GFP-RGS2 and β2-AR-Rluc was detected only when AC was co-expressed, suggesting AC stabilizes or promotes RGS2–receptor binding.","method":"GFP-RGS2 confocal localization, BRET (bioluminescence resonance energy transfer), GST pulldown with purified proteins","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — BRET and GST pulldown with multiple AC isoforms, single lab, two orthogonal methods","pmids":["16095880"],"is_preprint":false},{"year":2006,"finding":"RGS2 directly interacts with the NH2-terminal domain of TRPV6 (identified by yeast two-hybrid and GST pulldown). RGS2 overexpression reduces Na+ and Ca2+ current through TRPV6 but not TRPV5 in HEK293 cells. The ΔN-RGS2 deletion mutant lacking the NH2-terminal domain does not inhibit TRPV6 current. Cell surface biotinylation showed the inhibitory effect is not mediated by altered TRPV6 trafficking. The scaffolding protein spinophilin does not affect RGS2–TRPV6 binding or electrophysiology, indicating a GPCR-independent mechanism.","method":"Yeast two-hybrid, GST pulldown, whole-cell patch clamp electrophysiology, cell surface biotinylation, deletion mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — yeast two-hybrid confirmed by GST pulldown, functional electrophysiology with deletion mutants and surface biotinylation, single lab, multiple orthogonal methods","pmids":["16895908"],"is_preprint":false},{"year":2006,"finding":"RGS2 directly interacts with tubulin via amino acids 41–60 at its N-terminus and enhances microtubule polymerization in vitro. The tubulin binding region is necessary and sufficient for this activity. In Vero cells, microinjection of peptides containing the tubulin-binding region stimulated microtubule polymerization. Endogenous RGS2 localizes to the termini of neurites in differentiated PC12 cells. RGS2 overexpression enhanced NGF-induced neurite outgrowth, while RGS2 knockdown suppressed it.","method":"Co-immunoprecipitation with tubulin, in vitro microtubule polymerization assay, peptide microinjection in Vero cells, immunocytochemistry, PC12 neurite outgrowth assay with overexpression and siRNA knockdown","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro polymerization assay plus cell-based localization and functional readout, single lab, multiple methods","pmids":["16820281"],"is_preprint":false},{"year":2006,"finding":"RGS2 determines short-term synaptic plasticity in hippocampal neurons by downregulating Gi/o-mediated presynaptic Ca2+ channel inhibition, thereby increasing synaptic vesicle release. This was established by comparing electrophysiological recordings from RGS2 knockout and wild-type mice.","method":"Electrophysiological recordings from hippocampal neurons in RGS2 knockout vs. wild-type mice","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Moderate — loss-of-function (knockout) with defined electrophysiological phenotype in neurons, clean mechanistic interpretation","pmids":["16950156"],"is_preprint":false},{"year":2007,"finding":"RGS2 modulates the coupling efficiency between GABA(B) receptors and GIRK channels in dopamine neurons of the ventral tegmental area. In DA neurons, low coupling efficiency reflects selective expression of heteromeric GIRK2/3 channels and is dynamically modulated by RGS2. Repetitive exposure to GHB increases GABA(B) receptor–GIRK channel coupling efficiency through downregulation of RGS2.","method":"Electrophysiology in VTA DA and GABA neurons from mice, RGS2 knockdown/downregulation experiments with GHB exposure","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — electrophysiology in specific neuronal subtypes with pharmacological and molecular manipulation, replicated across conditions","pmids":["17965710"],"is_preprint":false},{"year":2007,"finding":"cGMP-dependent protein kinase type Iα (cGKIα) phosphorylates RGS2, promoting its association with the plasma membrane (via its cGKIα phosphorylation sites) and increasing its GAP activity. RGS2 is degraded in vascular smooth muscle cells via the proteasome. Inhibition of cGK activity blunts RGS2 degradation, but inactivation of the cGKIα phosphorylation sites in RGS2 does not stabilize the protein, indicating cGK regulates RGS2 degradation through other mechanisms. RGS2 is required for cGMP-mediated inhibition of vasoconstrictor-elicited PLCβ activation, Ca2+ store release, and capacitative Ca2+ entry.","method":"Phosphorylation assay, confocal microscopy of RGS2 plasma membrane association, proteasome inhibitor treatment, Ca2+ signaling assays in VSMCs from RGS2-deficient and wild-type mice","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — phosphorylation site mutagenesis, knockout mouse VSMCs, multiple signaling readouts, single lab","pmids":["17681944"],"is_preprint":false},{"year":2008,"finding":"A human hypertension-associated RGS2 missense mutation R44H (within the N-terminal amphipathic α-helix) results in decreased plasma membrane association and weaker inhibition of receptor-mediated Gq signaling compared to wild-type RGS2. Tryptophan fluorescence and circular dichroism studies showed that R44H prevents proper entrenchment of hydrophobic residues into the lipid bilayer without disrupting helix-forming capacity. The R44H protein does not act as a dominant-negative.","method":"Confocal microscopy (YFP-tagged constructs), tryptophan fluorescence spectroscopy, circular dichroism, Gq signaling functional assay","journal":"Molecular pharmacology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — biophysical characterization of mutant (CD + fluorescence) plus cellular localization plus functional assay, single lab, multiple orthogonal methods","pmids":["18230714"],"is_preprint":false},{"year":2009,"finding":"RGS2 binds eIF2Bε (eukaryotic initiation factor 2B epsilon subunit) and inhibits mRNA translation. This effect was not observed for other RGS proteins tested. The translation-inhibitory function maps to a 37-amino acid stretch within the conserved RGS domain and is distinct from RGS2's G protein GAP activity. RGS2 interferes with the eIF2–eIF2B GTPase cycle required for initiation of mRNA translation.","method":"Co-immunoprecipitation (RGS2–eIF2Bε binding), in vitro translation assay, domain mapping with deletion constructs, comparison across multiple RGS family members","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct binding by co-IP with functional translation assay and domain-mapping mutagenesis, single lab, two orthogonal methods","pmids":["19736320"],"is_preprint":false},{"year":2009,"finding":"Structural determinants of RGS2 Gα selectivity were identified by x-ray crystallography. A trio of point mutations in RGS2 confers Gαi-directed binding and GAP activities without perturbing Gαq association. Crystal structure of the triple-mutant RGS2 in complex with transition-state Gαi was solved at 2.8 Å resolution. These three amino acids are evolutionarily conserved among organisms with modern cardiovascular systems, suggesting RGS2 specialized as a potent Gαq GAP.","method":"X-ray crystallography (2.8 Å), site-directed mutagenesis, in vitro GAP activity assay, Gα binding assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with mutagenesis and functional GAP assay, single lab, multiple orthogonal methods","pmids":["19478087"],"is_preprint":false},{"year":2010,"finding":"ANP/GC-A/cGMP signaling selectively suppresses Ang II (Gαq-mediated) but not isoproterenol (Gαs-mediated) Ca2+ currents and transients in cardiomyocytes. This suppression is abolished in cardiomyocytes deficient in GC-A, PKG I, or RGS2 (a target of PKG I), establishing RGS2 as a required downstream effector of the PKG I-mediated pathway that antagonizes Ang II/AT1 signaling.","method":"Voltage-clamp recordings, fluorescence Ca2+ imaging in isolated cardiomyocytes, cardiomyocyte-conditional GC-A KO mice, PKG I KO and RGS2 KO mice","journal":"Basic research in cardiology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — loss-of-function in three KO mouse models with electrophysiological and Ca2+ readouts, epistasis established, single study","pmids":["20352235"],"is_preprint":false},{"year":2011,"finding":"RGS2 is required for LABA-induced bronchoprotection. In primary human airway smooth muscle cells, glucocorticoid/LABA combinations synergistically induce RGS2 expression. RGS2 reduced intracellular free Ca2+ flux elicited by histamine, methacholine, leukotrienes, and other spasmogens. Protection against spasmogen-increased Ca2+ following 6 h of LABA plus corticosteroid treatment was dependent on RGS2. Rgs2-deficient mice showed enhanced bronchoconstriction to spasmogens and absence of LABA-induced bronchoprotection.","method":"Ca2+ flux assay in human airway smooth muscle cells, RGS2 siRNA knockdown, Rgs2-/- mouse bronchoconstriction assay, gene expression analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — human cell loss-of-function plus Rgs2 KO mouse phenotype, multiple agonists tested, functional mechanism established","pmids":["22080612"],"is_preprint":false},{"year":2014,"finding":"RGS2 is a novel interacting partner of LRRK2 in vivo and regulates both the GTPase and kinase activities of LRRK2. RGS2 regulates LRRK2-dependent control of neuronal process length in mammalian neurons, and is protective against neuronal toxicity of the LRRK2 G2019S mutation. RGS2 regulation of LRRK2 function occurs through effects on kinase activity independently of GTPase activity.","method":"Co-immunoprecipitation (in vivo interaction), kinase and GTPase activity assays, neuronal process length measurement, toxicity assay in mammalian neurons","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus functional kinase/GTPase assays plus neuronal phenotype, single lab, multiple methods","pmids":["24794857"],"is_preprint":false},{"year":2014,"finding":"RGS2 interacts with PAR1 (protease-activated receptor 1) in a Gαq/11-dependent manner in live cells. Very little BRET activity is observed between PAR1 and RGS2 in the absence of Gα, but is markedly enhanced by Gαq/11. PAR1 mutant R205A (eliminating Gq/11 coupling) blocks this interaction. The purified intracellular third loop of PAR1 binds directly to purified His-RGS2. RGS2 inhibits PAR1/Gα-mediated calcium and MAPK/ERK signaling but not RhoA signaling.","method":"BRET in live COS-7 cells, GST pulldown with purified proteins, Ca2+ signaling assay, ERK phosphorylation assay, RhoA activity assay, site-directed mutagenesis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — BRET confirmed by direct in vitro pulldown plus multiple functional signaling assays, single lab","pmids":["24743392"],"is_preprint":false},{"year":2015,"finding":"RGS2 protein is degraded through the ubiquitin-proteasome system via a novel E3 ligase complex containing cullin 4B (CUL4B), DDB1, and F-box protein 44 (FBXO44). The more typical SCF complex (CUL1/Skp1/FBXO44) can bind FBXO44 but does not bind RGS2 and is not involved in its degradation.","method":"Genome-wide siRNA screen, co-immunoprecipitation, proteasome inhibitor assays, knockdown experiments","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA screen confirmed by co-IP, single lab, functional proteasomal degradation assay","pmids":["25970626"],"is_preprint":false},{"year":2015,"finding":"RGS2 protein is polyubiquitinated at residue K71 and undergoes proteasomal degradation. The deubiquitinase MCPIP1 stabilizes RGS2 protein; a dominant-negative MCPIP1 mutant (C157A) does not affect RGS2 levels. MG-132 treatment increased both endogenous and exogenous RGS2, indicating proteasomal regulation.","method":"Ubiquitination assay with K71 mutagenesis, proteasome inhibitor (MG-132) treatment, MCPIP1 overexpression and dominant-negative mutant, immunoblotting","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-specific ubiquitination mutagenesis and proteasome assay with deubiquitinase, single lab","pmids":["25187114"],"is_preprint":false},{"year":2019,"finding":"RGS2 promotes translation of ATF4 and CHOP by a mechanism involving its eIF2B-interacting domain (RGS2eb). Expression of full-length RGS2 or RGS2eb significantly increases ATF4 and CHOP protein levels. These effects are translationally regulated and independent of eIF2α phosphorylation.","method":"RGS2 and domain overexpression, immunoblotting for ATF4/CHOP, translation assay, eIF2α phosphorylation analysis","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-specific construct (RGS2eb) with functional translation readout, single lab, two orthogonal indicators","pmids":["30826455"],"is_preprint":false},{"year":2021,"finding":"RGS2 causes prolonged translational arrest in slow-cycling/dormant cancer cells (SCCs) through persistent eIF2α phosphorylation via proteasome-mediated degradation of ATF4 (activating transcription factor 4). RGS2 antagonism or phosphodiesterase 5 inhibitors promoted ER stress-induced apoptosis in SCCs under stressed conditions.","method":"Proliferation-sensitive dye labeling, chemotherapeutic selection, lentiviral RGS2 overexpression/knockdown, eIF2α phosphorylation assay, ATF4 protein stability assay with proteasome inhibitors, in vitro and in vivo apoptosis assays","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic pathway (RGS2→eIF2α phosphorylation→ATF4 degradation) established with multiple cell/mouse experiments, single lab","pmids":["33393490"],"is_preprint":false},{"year":2011,"finding":"RGS2 downregulation in striatal neurons of Huntington's disease models is a compensatory response. Silencing RGS2 in cultured rat primary striatal neurons reduced mutant huntingtin fragment toxicity and enhanced ERK activation, establishing a link between RGS2 inhibition and neuroprotective ERK signaling.","method":"Lentiviral shRNA knockdown in primary striatal neurons, cell viability assay, ERK phosphorylation assay, lentiviral RGS2 overexpression","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — lentiviral knockdown and overexpression with defined cell viability and ERK signaling readouts, single lab","pmids":["21779398"],"is_preprint":false},{"year":2014,"finding":"PKG (but not PKA) phosphorylates RGS2 at Ser46 and Ser64 in gastrointestinal smooth muscle and enhances association of Gαi3-GTP with RGS2, thereby accelerating Gαi GTPase activity, enhancing Gαβγi trimer reassembly, and inhibiting Gβγi-dependent PLCβ3 activity. Expression of phosphorylation-site-deficient RGS2 (S46A/S64A) or RGS2 siRNA partially reversed the effect of GSNO on PI hydrolysis.","method":"PKG phosphorylation assay, co-immunoprecipitation of Gαi3 and RGS2, PI hydrolysis assay, phosphorylation-site mutagenesis (S46A/S64A), siRNA knockdown","journal":"Cell biochemistry and biophysics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phosphorylation site mutagenesis plus co-IP plus functional PI hydrolysis assay, single lab, multiple methods","pmids":["24777815"],"is_preprint":false},{"year":2006,"finding":"RGS2 directly binds STAT3 in the nucleus and represses STAT3-mediated transcriptional activation of Nox1. A GFP-tagged RGS2 concentrates in the nucleus and directly binds STAT3, inhibiting its transcriptional activity. RGS2 expression is itself repressed by TLR2 signaling.","method":"Co-immunoprecipitation (RGS2–STAT3 binding), GFP-RGS2 confocal localization, Nox1 reporter assay, siRNA knockdown","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — direct binding by co-IP plus nuclear localization plus transcriptional reporter, single lab","pmids":["22120521"],"is_preprint":false},{"year":1999,"finding":"RGS2 accelerates the speed of ACh-mediated activation and deactivation of GIRK1/2 and GIRK1/4 currents in Xenopus oocytes. Two point mutations in RGS2 (N109S and L180F) reduced the acceleration of current amplification after ACh application on GIRK1/4 channels compared with wild-type RGS2. Pertussis toxin completely abolished ACh-mediated current amplification with or without RGS2, indicating RGS2 acts on Gi/o.","method":"Xenopus oocyte whole-cell electrophysiology, RGS2 co-expression with GIRK and mAChR subunits, site-directed mutagenesis, pertussis toxin treatment","journal":"The Journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiology in oocytes with mutagenesis and pharmacological controls, single lab","pmids":["10332086"],"is_preprint":false},{"year":2003,"finding":"Loss of RGS2 in mice increases agonist potency and efficacy for P2Y receptor-mediated Ca2+ signaling in vascular smooth muscle cells and slows the kinetics of signal termination, resulting in prolonged vasoconstriction and hypertension.","method":"RGS2-/- and RGS2+/- mouse model; in vivo blood pressure telemetry; in vitro vascular smooth muscle cell Ca2+ imaging","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout mouse with in vivo blood pressure phenotype and in vitro cellular Ca2+ mechanistic readout, extensively replicated","pmids":["12588882"],"is_preprint":false},{"year":2010,"finding":"Renal RGS2 is sufficient to control blood pressure: kidney cross-transplantation in RGS2-deficient mice showed that loss of renal RGS2 was sufficient to cause hypertension, whereas absence of RGS2 from all extrarenal tissues (including peripheral vasculature) did not significantly alter blood pressure.","method":"Kidney cross-transplantation in total body RGS2-deficient and wild-type mice, blood pressure measurement","journal":"Journal of the American Society of Nephrology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic epistasis via organ transplantation strategy, clean functional readout, single lab","pmids":["20847141"],"is_preprint":false},{"year":2023,"finding":"RGS2 enhances estradiol biosynthesis in trophoblasts by promoting proteasomal degradation of HAND1 (a trans-inactivator of the aromatase gene) through suppression of USP14-mediated deubiquitination of HAND1, thereby increasing aromatase expression and E2 production. However, aromatase binds to RGS2 and represses its GAP activity.","method":"JEG-3 cell overexpression/knockdown, protein stability assays, co-immunoprecipitation (RGS2–aromatase, RGS2–USP14), ubiquitination assay for HAND1, E2 ELISA, reporter assays","journal":"Experimental & molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus functional ubiquitination/stability assay plus E2 output, single lab, multiple methods","pmids":["36653442"],"is_preprint":false}],"current_model":"RGS2 is a GTPase-accelerating protein (GAP) that selectively and potently accelerates GTP hydrolysis by Gqα (and to a lesser extent Gi under receptor-reconstituted conditions), thereby terminating G protein-coupled receptor signaling; its N-terminal amphipathic helix targets it to the plasma membrane by binding acidic phospholipids and directly engaging the third intracellular loops of specific GPCRs (M1 mAChR, α1A-AR, β2-AR, PAR1) in a complex also organized by the scaffold spinophilin, while its N-terminus independently inhibits adenylyl cyclase by binding the AC C1 domain; RGS2 is subject to PKC- and PKG-mediated phosphorylation (modulating GAP activity and membrane association), proteasomal degradation via a CUL4B/DDB1/FBXO44 E3 ligase complex, and polyubiquitination at K71 stabilized by MCPIP1; in addition to G protein regulation, RGS2 directly inhibits mRNA translation by binding eIF2Bε to interfere with the eIF2–eIF2B GTPase exchange cycle, promotes translation of stress-response factors ATF4 and CHOP through persistent eIF2α phosphorylation, interacts with tubulin to promote microtubule polymerization and neurite outgrowth, binds STAT3 in the nucleus to repress Nox1 transcription, and modulates LRRK2 kinase activity; physiologically, RGS2 is a critical regulator of blood pressure (primarily through renal Gq signaling), cardiac hypertrophy, synaptic plasticity, bronchoprotection, and cell dormancy."},"narrative":{"mechanistic_narrative":"RGS2 is a GTPase-accelerating protein (GAP) that selectively and potently terminates Gq-coupled GPCR signaling, functioning as a critical brake on calcium-mobilizing pathways across vascular, cardiac, airway, and neuronal tissues [PMID:9405622, PMID:12588882]. It binds Gqalpha but not other Galpha families and is markedly more potent than RGS4 at inhibiting Gq-directed PLCbeta activation, with quantitative potency differences toward Gi versus Gq mapping to defined residues in the switch I binding pocket and alpha8-alpha9 loop; crystallography of a triple-mutant RGS2-Galphai complex established that three conserved residues specialized RGS2 as a dedicated Gq GAP [PMID:9405622, PMID:10567399, PMID:19478087]. Beyond catalytic GAP activity, RGS2 acts as a receptor-proximal effector antagonist: its N-terminal amphipathic helix binds acidic phospholipids to target the plasma membrane and directly engages the third intracellular loops of specific receptors including M1 mAChR, alpha1A-AR, beta2-AR, and PAR1, frequently organized by the scaffold spinophilin and in some cases stabilized by activated Gq or adenylyl cyclase [PMID:11278586, PMID:14976183, PMID:15917235, PMID:15793568, PMID:24743392]. The same N-terminal region independently inhibits type V adenylyl cyclase by binding its C1 domain, decoupling cAMP suppression from GAP function [PMID:12604604]. RGS2 activity and abundance are tightly regulated by PKC and cGMP-dependent protein kinase (cGKI/PKG) phosphorylation, which modulate GAP activity and membrane association, and by proteasomal turnover through a CUL4B/DDB1/FBXO44 E3 ligase complex and K71 polyubiquitination opposed by the deubiquitinase MCPIP1 [PMID:11063746, PMID:17681944, PMID:24777815, PMID:25970626, PMID:25187114]. RGS2 also carries G-protein-independent functions: a 37-residue segment within its RGS domain binds eIF2Bepsilon to inhibit mRNA translation and reprogram stress responses through ATF4/CHOP and persistent eIF2alpha phosphorylation, driving translational arrest in dormant cancer cells; it binds tubulin to promote microtubule polymerization and neurite outgrowth, binds STAT3 in the nucleus to repress Nox1 transcription, and modulates LRRK2 kinase activity [PMID:19736320, PMID:30826455, PMID:33393490, PMID:16820281, PMID:22120521, PMID:24794857]. Physiologically, RGS2 controls blood pressure principally through renal Gq signaling, mediates ANP/cGMP/PKG antagonism of angiotensin signaling in cardiomyocytes, governs LABA-induced airway smooth muscle bronchoprotection, and shapes short-term synaptic plasticity and GABA(B)-GIRK coupling in neurons [PMID:12588882, PMID:20847141, PMID:22080612, PMID:24794857, PMID:16950156, PMID:17965710]. A human hypertension-associated R44H mutation in the N-terminal helix impairs membrane association and Gq inhibition, directly linking RGS2 to blood pressure regulation [PMID:18230714].","teleology":[{"year":1997,"claim":"Established RGS2 as a selective, potent inhibitor of Gqalpha, defining its founding biochemical identity distinct from other RGS proteins.","evidence":"Pulldown binding, in vitro GTPase assay, and phospholipid vesicle reconstitution with PLCbeta1 activation","pmids":["9405622"],"confidence":"High","gaps":["Did not resolve structural basis of Gq selectivity","Receptor-coupled specificity in cells not yet defined"]},{"year":1998,"claim":"Showed RGS2 can also accelerate Gi1alpha GTPase activity under receptor-reconstituted conditions, defining context-dependent G protein selectivity.","evidence":"In vitro GTPase assay with M2 muscarinic receptor reconstitution and transfection-based signaling","pmids":["9736641"],"confidence":"High","gaps":["Physiological relevance of Gi activity versus dominant Gq role unclear"]},{"year":1999,"claim":"Quantified the Gq-versus-Gi potency differences distinguishing RGS2 from RGS4 and mapped selectivity-determining residues, framing RGS2 as a Gq-specialized GAP and demonstrating GIRK current modulation via Gi/o.","evidence":"Cell-based phosphoinositide hydrolysis, RGS2 mutagenesis, and Xenopus oocyte GIRK electrophysiology with pertussis toxin controls","pmids":["10567399","10332086"],"confidence":"High","gaps":["High-resolution structure of selectivity determinants not yet available"]},{"year":2001,"claim":"Identified the N-terminal amphipathic helix as necessary and sufficient for plasma membrane targeting via acidic phospholipid binding, explaining how RGS2 reaches its receptor/G protein substrates.","evidence":"GFP live-cell microscopy, liposome binding, and biophysical (CD/fluorescence) analysis of the helix","pmids":["11278586"],"confidence":"High","gaps":["Nuclear function of RGS2 not resolved at this stage"]},{"year":2003,"claim":"Revealed a GAP-independent function: the N-terminus directly inhibits type V adenylyl cyclase via its C1 domain, and showed selective G-protein/receptor-driven membrane recruitment.","evidence":"Co-IP, deletion and alanine-scanning mutagenesis, cAMP assays, and GFP recruitment by Galphas/Galphaq and receptors; in vivo blood pressure phenotyping of RGS2 knockouts","pmids":["12604604","12920194","12588882"],"confidence":"High","gaps":["Whether AC inhibition contributes to in vivo phenotypes untested","Mechanism of recruitment specificity incompletely defined"]},{"year":2004,"claim":"Demonstrated direct, selective binding of the RGS2 N-terminus to the M1 mAChR i3 loop, establishing RGS2 as a receptor-targeted effector antagonist separable from its GAP activity.","evidence":"GST pulldown, co-localization, ternary complex co-IP, and N-terminal deletion with phosphoinositide assays across receptor subtypes","pmids":["14976183"],"confidence":"High","gaps":["Scaffolding that organizes the receptor-RGS2 complex not yet identified"]},{"year":2005,"claim":"Identified spinophilin as a scaffold bridging RGS2 to GPCR i3 loops and extended direct receptor binding to alpha1A-AR and adenylyl cyclase isoforms, defining the architecture of receptor-proximal RGS2 recruitment.","evidence":"Reciprocal co-IP, GST pulldown, BRET, Xenopus oocyte Ca2+ assays, and single/double knockout cell assays","pmids":["15793568","15917235","16095880"],"confidence":"High","gaps":["Stoichiometry and dynamics of the full receptor-RGS2-spinophilin complex unresolved"]},{"year":2006,"claim":"Uncovered GPCR-independent roles: direct binding to TRPV6 channels, tubulin-driven microtubule polymerization and neurite outgrowth, and nuclear STAT3 binding repressing Nox1, broadening RGS2's functional repertoire.","evidence":"Yeast two-hybrid, GST pulldown, patch clamp, in vitro polymerization, PC12 outgrowth assays, and Nox1 reporter assays","pmids":["16895908","16820281","22120521"],"confidence":"Medium","gaps":["In vivo significance of TRPV6, tubulin, and STAT3 interactions not established","Several rely on overexpression in single labs"]},{"year":2007,"claim":"Established cGKIalpha/PKG phosphorylation as a positive regulator of RGS2 membrane association and GAP activity and defined RGS2's role in synaptic plasticity and GABA(B)-GIRK coupling, linking second-messenger control to function.","evidence":"Phosphorylation-site mutagenesis, confocal microscopy, VSMC Ca2+ assays, and hippocampal/VTA electrophysiology in knockout mice","pmids":["17681944","16950156","17965710"],"confidence":"High","gaps":["Mechanism by which cGK regulates RGS2 degradation distinct from phosphorylation sites unresolved"]},{"year":2008,"claim":"Linked RGS2 to human hypertension by showing the R44H N-terminal mutation impairs membrane entrenchment and Gq inhibition, providing direct genetic-mechanistic evidence for the blood pressure role.","evidence":"Confocal microscopy, tryptophan fluorescence, circular dichroism, and Gq functional assays of the mutant","pmids":["18230714"],"confidence":"High","gaps":["Causality in human hypertension cohorts not addressed here"]},{"year":2009,"claim":"Defined a GAP-independent translational-control function: RGS2 binds eIF2Bepsilon via a 37-residue RGS-domain segment to inhibit mRNA translation, and crystallography resolved the structural basis of Gq selectivity.","evidence":"Co-IP, in vitro translation and domain mapping; x-ray crystallography of triple-mutant RGS2-Galphai with GAP assays","pmids":["19736320","19478087"],"confidence":"High","gaps":["Physiological contexts where translational versus GAP function dominates unclear at this stage"]},{"year":2010,"claim":"Localized blood pressure control to renal RGS2 and established RGS2 as the required downstream effector of cardiac ANP/GC-A/PKG antagonism of angiotensin Gq signaling.","evidence":"Kidney cross-transplantation in RGS2-deficient mice and voltage-clamp/Ca2+ imaging in GC-A, PKG I, and RGS2 knockout cardiomyocytes","pmids":["20847141","20352235"],"confidence":"High","gaps":["Renal cell type and signaling pathway mediating the effect not fully defined"]},{"year":2011,"claim":"Demonstrated RGS2 is required for glucocorticoid/LABA-induced airway smooth muscle bronchoprotection against multiple spasmogens, extending its Gq-braking role to respiratory physiology.","evidence":"Ca2+ flux in human ASM cells with siRNA and Rgs2-/- mouse bronchoconstriction assays","pmids":["22080612","21779398"],"confidence":"High","gaps":["Transcriptional induction mechanism by glucocorticoid/LABA only partially defined"]},{"year":2014,"claim":"Expanded the interactome to LRRK2 (regulating its kinase activity and neuroprotection), PAR1 (Gq/11-dependent receptor binding), and defined PKG phosphorylation at Ser46/Ser64 promoting Gi3 GAP activity.","evidence":"Co-IP, kinase/GTPase assays, BRET, GST pulldown, PI hydrolysis assays, and phosphorylation-site mutagenesis","pmids":["24794857","24743392","24777815"],"confidence":"Medium","gaps":["LRRK2 and PAR1 interactions from single labs without reciprocal in vivo validation"]},{"year":2015,"claim":"Defined the proteostatic control of RGS2 abundance through a non-canonical CUL4B/DDB1/FBXO44 E3 ligase and K71 polyubiquitination opposed by the deubiquitinase MCPIP1.","evidence":"Genome-wide siRNA screen, co-IP, K71 mutagenesis, and proteasome inhibitor assays","pmids":["25970626","25187114"],"confidence":"Medium","gaps":["Signals triggering CUL4B complex assembly on RGS2 unknown","Interplay between the two degradation routes unresolved"]},{"year":2019,"claim":"Connected RGS2's eIF2B-binding domain to selective promotion of ATF4 and CHOP translation, defining its role in the integrated stress response independent of eIF2alpha phosphorylation.","evidence":"Full-length and RGS2eb domain overexpression with ATF4/CHOP immunoblotting and translation assays","pmids":["30826455"],"confidence":"Medium","gaps":["Mechanism reconciling translation inhibition with selective ATF4/CHOP enhancement incompletely defined"]},{"year":2021,"claim":"Established RGS2 as a driver of cancer cell dormancy through persistent eIF2alpha phosphorylation and proteasomal ATF4 degradation, identifying it as a therapeutic vulnerability.","evidence":"Dye-labeled slow-cycling cell selection, lentiviral perturbation, eIF2alpha/ATF4 assays, and in vivo apoptosis assays","pmids":["33393490"],"confidence":"Medium","gaps":["Generalizability across tumor types not established","Single-lab mechanistic model"]},{"year":2023,"claim":"Revealed a reproductive role in which RGS2 enhances trophoblast estradiol biosynthesis by promoting HAND1 degradation via USP14 suppression, with reciprocal repression of RGS2 GAP activity by aromatase.","evidence":"JEG-3 overexpression/knockdown, co-IP, ubiquitination/stability assays, E2 ELISA, and reporter assays","pmids":["36653442"],"confidence":"Medium","gaps":["In vivo placental relevance not tested","Single-lab finding"]},{"year":null,"claim":"How the multiple GAP-independent activities (translation control, tubulin binding, STAT3/Nox1, LRRK2, channel and aromatase interactions) are integrated and prioritized in specific cell types, and what governs the choice between them, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying framework linking GAP and non-GAP functions","Tissue-specific dominance of each function undetermined","Structural basis of most non-G-protein interactions unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,7,9,18]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[21]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[12]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[17,25,26]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,1]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[4]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[4,6,7,9,10]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[4,6,29]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[12]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,7,9,22,31]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[17,25,26]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[25,26]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[13,14]}],"complexes":[],"partners":["GNAQ","SPINOPHILIN","ADRA1A","ADRB2","F2R","EIF2B5","STAT3","LRRK2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P41220","full_name":"Regulator of G-protein signaling 2","aliases":["Cell growth-inhibiting gene 31 protein","G0/G1 switch regulatory protein 8"],"length_aa":211,"mass_kda":24.4,"function":"Regulates G protein-coupled receptor signaling cascades. Inhibits signal transduction by increasing the GTPase activity of G protein alpha subunits, thereby driving them into their inactive GDP-bound form (PubMed:11063746, PubMed:19478087). It is involved in the negative regulation of the angiotensin-activated signaling pathway (PubMed:28784619). Plays a role in the regulation of blood pressure in response to signaling via G protein-coupled receptors and GNAQ. Plays a role in regulating the constriction and relaxation of vascular smooth muscle (By similarity). Binds EIF2B5 and blocks its activity, thereby inhibiting the translation of mRNA into protein (PubMed:19736320)","subcellular_location":"Cell membrane; Mitochondrion","url":"https://www.uniprot.org/uniprotkb/P41220/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RGS2","classification":"Not Classified","n_dependent_lines":6,"n_total_lines":1208,"dependency_fraction":0.004966887417218543},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RGS2","total_profiled":1310},"omim":[{"mim_id":"620544","title":"PPP1R13B DIVERGENT TRANSCRIPT, NONCODING; PPP1R13BDT","url":"https://www.omim.org/entry/620544"},{"mim_id":"613297","title":"MEMBRANE-ASSOCIATED RING-CH FINGER PROTEIN 6; MARCHF6","url":"https://www.omim.org/entry/613297"},{"mim_id":"612407","title":"REGULATOR OF G PROTEIN SIGNALING 21; RGS21","url":"https://www.omim.org/entry/612407"},{"mim_id":"609757","title":"WILLIAMS-BEUREN REGION DUPLICATION SYNDROME","url":"https://www.omim.org/entry/609757"},{"mim_id":"608986","title":"CREB-REGULATED TRANSCRIPTION COACTIVATOR 3; CRTC3","url":"https://www.omim.org/entry/608986"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/RGS2"},"hgnc":{"alias_symbol":[],"prev_symbol":["G0S8"]},"alphafold":{"accession":"P41220","domains":[{"cath_id":"1.10.167.10","chopping":"108-198","consensus_level":"high","plddt":96.9949,"start":108,"end":198}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P41220","model_url":"https://alphafold.ebi.ac.uk/files/AF-P41220-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P41220-F1-predicted_aligned_error_v6.png","plddt_mean":80.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RGS2","jax_strain_url":"https://www.jax.org/strain/search?query=RGS2"},"sequence":{"accession":"P41220","fasta_url":"https://rest.uniprot.org/uniprotkb/P41220.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P41220/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P41220"}},"corpus_meta":[{"pmid":"9405622","id":"PMC_9405622","title":"RGS2/G0S8 is a selective inhibitor of Gqalpha function.","date":"1997","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/9405622","citation_count":303,"is_preprint":false},{"pmid":"9736641","id":"PMC_9736641","title":"Dynamic regulation of RGS2 suggests a novel mechanism in G-protein signaling and neuronal plasticity.","date":"1998","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/9736641","citation_count":253,"is_preprint":false},{"pmid":"12588882","id":"PMC_12588882","title":"Hypertension and prolonged vasoconstrictor signaling in RGS2-deficient mice.","date":"2003","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/12588882","citation_count":246,"is_preprint":false},{"pmid":"11027316","id":"PMC_11027316","title":"Regulation of T cell activation, anxiety, and male aggression by RGS2.","date":"2000","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/11027316","citation_count":232,"is_preprint":false},{"pmid":"14976183","id":"PMC_14976183","title":"RGS2 binds directly and selectively to the M1 muscarinic acetylcholine receptor third intracellular loop to modulate Gq/11alpha signaling.","date":"2004","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/14976183","citation_count":188,"is_preprint":false},{"pmid":"17965710","id":"PMC_17965710","title":"RGS2 modulates coupling between GABAB receptors and GIRK channels in dopamine neurons of the ventral tegmental area.","date":"2007","source":"Nature neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/17965710","citation_count":177,"is_preprint":false},{"pmid":"10567399","id":"PMC_10567399","title":"G protein selectivity is a determinant of RGS2 function.","date":"1999","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10567399","citation_count":152,"is_preprint":false},{"pmid":"11906816","id":"PMC_11906816","title":"RGS2: a multifunctional regulator of G-protein signaling.","date":"2002","source":"The international journal of biochemistry & cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/11906816","citation_count":129,"is_preprint":false},{"pmid":"15793568","id":"PMC_15793568","title":"Spinophilin regulates Ca2+ signalling by binding the N-terminal domain of RGS2 and the third intracellular loop of G-protein-coupled receptors.","date":"2005","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/15793568","citation_count":118,"is_preprint":false},{"pmid":"16685212","id":"PMC_16685212","title":"Reduced expression of regulator of G-protein signaling 2 (RGS2) in hypertensive patients increases calcium mobilization and ERK1/2 phosphorylation induced by angiotensin II.","date":"2006","source":"Journal of hypertension","url":"https://pubmed.ncbi.nlm.nih.gov/16685212","citation_count":115,"is_preprint":false},{"pmid":"12920194","id":"PMC_12920194","title":"Recruitment of RGS2 and RGS4 to the plasma membrane by G proteins and receptors reflects functional interactions.","date":"2003","source":"Molecular pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/12920194","citation_count":114,"is_preprint":false},{"pmid":"10523302","id":"PMC_10523302","title":"A novel regulator of G protein signalling in yeast, Rgs2, downregulates glucose-activation of the cAMP pathway through direct inhibition of Gpa2.","date":"1999","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/10523302","citation_count":114,"is_preprint":false},{"pmid":"12604604","id":"PMC_12604604","title":"Identification of RGS2 and type V adenylyl cyclase interaction sites.","date":"2003","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12604604","citation_count":111,"is_preprint":false},{"pmid":"11278586","id":"PMC_11278586","title":"Mechanisms governing subcellular localization and function of human RGS2.","date":"2001","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11278586","citation_count":108,"is_preprint":false},{"pmid":"16095880","id":"PMC_16095880","title":"RGS2 interacts with Gs and adenylyl cyclase in living cells.","date":"2005","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/16095880","citation_count":104,"is_preprint":false},{"pmid":"18316676","id":"PMC_18316676","title":"Influence of RGS2 on anxiety-related temperament, personality, and brain function.","date":"2008","source":"Archives of general psychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/18316676","citation_count":98,"is_preprint":false},{"pmid":"16380388","id":"PMC_16380388","title":"Selective loss of fine tuning of Gq/11 signaling by RGS2 protein exacerbates cardiomyocyte hypertrophy.","date":"2005","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16380388","citation_count":88,"is_preprint":false},{"pmid":"11063746","id":"PMC_11063746","title":"Protein kinase C phosphorylates RGS2 and modulates its capacity for negative regulation of Galpha 11 signaling.","date":"2000","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11063746","citation_count":85,"is_preprint":false},{"pmid":"15917235","id":"PMC_15917235","title":"Selective inhibition of alpha1A-adrenergic receptor signaling by RGS2 association with the receptor third intracellular loop.","date":"2005","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15917235","citation_count":85,"is_preprint":false},{"pmid":"16449965","id":"PMC_16449965","title":"Regulator of G-protein signaling 2 (RGS2) inhibits androgen-independent activation of androgen receptor in prostate cancer cells.","date":"2006","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/16449965","citation_count":81,"is_preprint":false},{"pmid":"10692485","id":"PMC_10692485","title":"Specific regulation of RGS2 messenger RNA by angiotensin II in cultured vascular smooth muscle cells.","date":"2000","source":"Molecular pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/10692485","citation_count":81,"is_preprint":false},{"pmid":"15661972","id":"PMC_15661972","title":"Autonomic nervous system and blood pressure regulation in RGS2-deficient mice.","date":"2005","source":"American journal of physiology. Regulatory, integrative and comparative physiology","url":"https://pubmed.ncbi.nlm.nih.gov/15661972","citation_count":81,"is_preprint":false},{"pmid":"19162436","id":"PMC_19162436","title":"Variant in RGS2 moderates posttraumatic stress symptoms following potentially traumatic event exposure.","date":"2008","source":"Journal of anxiety disorders","url":"https://pubmed.ncbi.nlm.nih.gov/19162436","citation_count":73,"is_preprint":false},{"pmid":"16950156","id":"PMC_16950156","title":"RGS2 determines short-term synaptic plasticity in hippocampal neurons by regulating Gi/o-mediated inhibition of presynaptic Ca2+ channels.","date":"2006","source":"Neuron","url":"https://pubmed.ncbi.nlm.nih.gov/16950156","citation_count":71,"is_preprint":false},{"pmid":"22080612","id":"PMC_22080612","title":"β2-Adrenoceptor agonist-induced RGS2 expression is a genomic mechanism of bronchoprotection that is enhanced by glucocorticoids.","date":"2011","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/22080612","citation_count":67,"is_preprint":false},{"pmid":"19478087","id":"PMC_19478087","title":"Structural determinants of G-protein alpha subunit selectivity by regulator of G-protein signaling 2 (RGS2).","date":"2009","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/19478087","citation_count":66,"is_preprint":false},{"pmid":"20352235","id":"PMC_20352235","title":"Novel insights into the mechanisms mediating the local antihypertrophic effects of cardiac atrial natriuretic peptide: role of cGMP-dependent protein kinase and RGS2.","date":"2010","source":"Basic research in cardiology","url":"https://pubmed.ncbi.nlm.nih.gov/20352235","citation_count":66,"is_preprint":false},{"pmid":"15536149","id":"PMC_15536149","title":"RGS2 is an important target gene of Flt3-ITD mutations in AML and functions in myeloid differentiation and leukemic transformation.","date":"2004","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/15536149","citation_count":65,"is_preprint":false},{"pmid":"9174164","id":"PMC_9174164","title":"Comparison of mRNA expression of two regulators of G-protein signaling, RGS1/BL34/1R20 and RGS2/G0S8, in cultured human blood mononuclear cells.","date":"1997","source":"DNA and cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/9174164","citation_count":61,"is_preprint":false},{"pmid":"15090051","id":"PMC_15090051","title":"Dopamine receptor-mediated regulation of RGS2 and RGS4 mRNA differentially depends on ascending dopamine projections and time.","date":"2004","source":"The European journal of neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/15090051","citation_count":56,"is_preprint":false},{"pmid":"10614620","id":"PMC_10614620","title":"Dynamic regulation of RGS2 in bone: potential new insights into parathyroid hormone signaling mechanisms.","date":"2000","source":"Endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/10614620","citation_count":55,"is_preprint":false},{"pmid":"21494556","id":"PMC_21494556","title":"Rgs2 mediates pro-angiogenic function of myeloid derived suppressor cells in the tumor microenvironment via upregulation of MCP-1.","date":"2011","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/21494556","citation_count":55,"is_preprint":false},{"pmid":"25187114","id":"PMC_25187114","title":"RGS2 suppresses breast cancer cell growth via a MCPIP1-dependent pathway.","date":"2015","source":"Journal of cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/25187114","citation_count":52,"is_preprint":false},{"pmid":"20362664","id":"PMC_20362664","title":"RGS2 inhibits beta-adrenergic receptor-induced cardiomyocyte hypertrophy.","date":"2010","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/20362664","citation_count":52,"is_preprint":false},{"pmid":"18833580","id":"PMC_18833580","title":"RGS2 and generalized anxiety disorder in an epidemiologic sample of hurricane-exposed adults.","date":"2009","source":"Depression and anxiety","url":"https://pubmed.ncbi.nlm.nih.gov/18833580","citation_count":51,"is_preprint":false},{"pmid":"33393490","id":"PMC_33393490","title":"RGS2-mediated translational control mediates cancer cell dormancy and tumor relapse.","date":"2021","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/33393490","citation_count":50,"is_preprint":false},{"pmid":"19736320","id":"PMC_19736320","title":"Translational control by RGS2.","date":"2009","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/19736320","citation_count":49,"is_preprint":false},{"pmid":"11906535","id":"PMC_11906535","title":"Expression of RGS2, RGS4 and RGS7 in the developing postnatal brain.","date":"2002","source":"The European journal of neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/11906535","citation_count":48,"is_preprint":false},{"pmid":"22057271","id":"PMC_22057271","title":"Identification of a cAMP-response element in the regulator of G-protein signaling-2 (RGS2) promoter as a key cis-regulatory element for RGS2 transcriptional regulation by angiotensin II in cultured vascular smooth muscles.","date":"2011","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/22057271","citation_count":48,"is_preprint":false},{"pmid":"19966055","id":"PMC_19966055","title":"Evidence for enhanced M3 muscarinic receptor function and sensitivity to atrial arrhythmia in the RGS2-deficient mouse.","date":"2009","source":"American journal of physiology. Heart and circulatory physiology","url":"https://pubmed.ncbi.nlm.nih.gov/19966055","citation_count":48,"is_preprint":false},{"pmid":"16517124","id":"PMC_16517124","title":"RGS2 is upregulated by and attenuates the hypertrophic effect of alpha1-adrenergic activation in cultured ventricular myocytes.","date":"2006","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/16517124","citation_count":47,"is_preprint":false},{"pmid":"21779398","id":"PMC_21779398","title":"Decreased striatal RGS2 expression is neuroprotective in Huntington's disease (HD) and exemplifies a compensatory aspect of HD-induced gene regulation.","date":"2011","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/21779398","citation_count":46,"is_preprint":false},{"pmid":"24794857","id":"PMC_24794857","title":"A Parkinson's disease gene regulatory network identifies the signaling protein RGS2 as a modulator of LRRK2 activity and neuronal toxicity.","date":"2014","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/24794857","citation_count":45,"is_preprint":false},{"pmid":"10332086","id":"PMC_10332086","title":"New roles for RGS2, 5 and 8 on the ratio-dependent modulation of recombinant GIRK channels expressed in Xenopus oocytes.","date":"1999","source":"The Journal of physiology","url":"https://pubmed.ncbi.nlm.nih.gov/10332086","citation_count":45,"is_preprint":false},{"pmid":"36591293","id":"PMC_36591293","title":"Fatty acid metabolism is related to the immune microenvironment changes of gastric cancer and RGS2 is a new tumor biomarker.","date":"2022","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/36591293","citation_count":43,"is_preprint":false},{"pmid":"11488592","id":"PMC_11488592","title":"Oxidative stress and heat shock stimulate RGS2 expression in 1321N1 astrocytoma cells.","date":"2001","source":"Archives of biochemistry and biophysics","url":"https://pubmed.ncbi.nlm.nih.gov/11488592","citation_count":42,"is_preprint":false},{"pmid":"17681944","id":"PMC_17681944","title":"Regulation of RGS2 and second messenger signaling in vascular smooth muscle cells by cGMP-dependent protein kinase.","date":"2007","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/17681944","citation_count":41,"is_preprint":false},{"pmid":"7643615","id":"PMC_7643615","title":"Differential expression of a basic helix-loop-helix phosphoprotein gene, G0S8, in acute leukemia and localization to human chromosome 1q31.","date":"1995","source":"Leukemia","url":"https://pubmed.ncbi.nlm.nih.gov/7643615","citation_count":39,"is_preprint":false},{"pmid":"16895908","id":"PMC_16895908","title":"RGS2 inhibits the epithelial Ca2+ channel TRPV6.","date":"2006","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16895908","citation_count":39,"is_preprint":false},{"pmid":"12181442","id":"PMC_12181442","title":"Characterization and comparison of RGS2 and RGS4 as GTPase-activating proteins for m2 muscarinic receptor-stimulated G(i).","date":"2002","source":"Molecular pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/12181442","citation_count":39,"is_preprint":false},{"pmid":"12419501","id":"PMC_12419501","title":"Opposite modulation of regulators of G protein signalling-2 RGS2 and RGS4 expression by dopamine receptors in the rat striatum.","date":"2002","source":"Neuroscience letters","url":"https://pubmed.ncbi.nlm.nih.gov/12419501","citation_count":39,"is_preprint":false},{"pmid":"16820281","id":"PMC_16820281","title":"RGS2 promotes formation of neurites by stimulating microtubule polymerization.","date":"2006","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/16820281","citation_count":39,"is_preprint":false},{"pmid":"28102109","id":"PMC_28102109","title":"Epigenetic regulation of RGS2 (Regulator of G-protein signaling 2) in chemoresistant ovarian cancer cells.","date":"2017","source":"Journal of chemotherapy (Florence, Italy)","url":"https://pubmed.ncbi.nlm.nih.gov/28102109","citation_count":37,"is_preprint":false},{"pmid":"20036967","id":"PMC_20036967","title":"Deregulation of RGS2 in cardiovascular diseases.","date":"2010","source":"Frontiers in bioscience (Scholar edition)","url":"https://pubmed.ncbi.nlm.nih.gov/20036967","citation_count":36,"is_preprint":false},{"pmid":"16627589","id":"PMC_16627589","title":"RGS2 is regulated by angiotensin II and functions as a negative feedback of aldosterone production in H295R human adrenocortical cells.","date":"2006","source":"Endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/16627589","citation_count":35,"is_preprint":false},{"pmid":"17728697","id":"PMC_17728697","title":"Association of RGS2 gene polymorphisms with suicide and increased RGS2 immunoreactivity in the postmortem brain of suicide victims.","date":"2007","source":"Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/17728697","citation_count":34,"is_preprint":false},{"pmid":"18207159","id":"PMC_18207159","title":"RGS5, RGS4, and RGS2 expression and aortic contractibility are dynamically co-regulated during aortic banding-induced hypertrophy.","date":"2007","source":"Journal of molecular and cellular cardiology","url":"https://pubmed.ncbi.nlm.nih.gov/18207159","citation_count":34,"is_preprint":false},{"pmid":"11968023","id":"PMC_11968023","title":"Analysis of regulator of G-protein signaling-2 (RGS-2) expression and function in osteoblastic cells.","date":"2002","source":"Journal of cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11968023","citation_count":34,"is_preprint":false},{"pmid":"21291891","id":"PMC_21291891","title":"RGS2 is a primary terminator of β₂-adrenergic receptor-mediated G(i) signaling.","date":"2011","source":"Journal of molecular and cellular cardiology","url":"https://pubmed.ncbi.nlm.nih.gov/21291891","citation_count":33,"is_preprint":false},{"pmid":"27549302","id":"PMC_27549302","title":"Upregulation of RGS2: a new mechanism for pirfenidone amelioration of pulmonary fibrosis.","date":"2016","source":"Respiratory research","url":"https://pubmed.ncbi.nlm.nih.gov/27549302","citation_count":32,"is_preprint":false},{"pmid":"15488171","id":"PMC_15488171","title":"RGS2-mediated regulation of Gqalpha.","date":"2004","source":"Methods in enzymology","url":"https://pubmed.ncbi.nlm.nih.gov/15488171","citation_count":32,"is_preprint":false},{"pmid":"17558307","id":"PMC_17558307","title":"Association of the RGS2 gene with extrapyramidal symptoms induced by treatment with antipsychotic medication.","date":"2007","source":"Pharmacogenetics and genomics","url":"https://pubmed.ncbi.nlm.nih.gov/17558307","citation_count":32,"is_preprint":false},{"pmid":"15914115","id":"PMC_15914115","title":"Angiotensin II-evoked enhanced expression of RGS2 attenuates Gi-mediated adenylyl cyclase signaling in A10 cells.","date":"2005","source":"Cardiovascular research","url":"https://pubmed.ncbi.nlm.nih.gov/15914115","citation_count":32,"is_preprint":false},{"pmid":"15292238","id":"PMC_15292238","title":"Role of regulator of G protein signaling 2 (RGS2) in Ca(2+) oscillations and adaptation of Ca(2+) signaling to reduce excitability of RGS2-/- cells.","date":"2004","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15292238","citation_count":31,"is_preprint":false},{"pmid":"18347610","id":"PMC_18347610","title":"Further evidence for association of the RGS2 gene with antipsychotic-induced parkinsonism: protective role of a functional polymorphism in the 3'-untranslated region.","date":"2008","source":"The pharmacogenomics journal","url":"https://pubmed.ncbi.nlm.nih.gov/18347610","citation_count":31,"is_preprint":false},{"pmid":"37014700","id":"PMC_37014700","title":"Long noncoding RNA HITT coordinates with RGS2 to inhibit PD-L1 translation in T cell immunity.","date":"2023","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/37014700","citation_count":30,"is_preprint":false},{"pmid":"16269576","id":"PMC_16269576","title":"NO-dependent blood pressure regulation in RGS2-deficient mice.","date":"2005","source":"American journal of physiology. Regulatory, integrative and comparative physiology","url":"https://pubmed.ncbi.nlm.nih.gov/16269576","citation_count":30,"is_preprint":false},{"pmid":"25970626","id":"PMC_25970626","title":"FBXO44-Mediated Degradation of RGS2 Protein Uniquely Depends on a Cullin 4B/DDB1 Complex.","date":"2015","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/25970626","citation_count":28,"is_preprint":false},{"pmid":"31865781","id":"PMC_31865781","title":"Reduced mRNA Expression of RGS2 (Regulator of G Protein Signaling-2) in the Placenta Is Associated With Human Preeclampsia and Sufficient to Cause Features of the Disorder in Mice.","date":"2019","source":"Hypertension (Dallas, Tex. : 1979)","url":"https://pubmed.ncbi.nlm.nih.gov/31865781","citation_count":28,"is_preprint":false},{"pmid":"18262772","id":"PMC_18262772","title":"Association of RGS2 and RGS5 variants with schizophrenia symptom severity.","date":"2008","source":"Schizophrenia research","url":"https://pubmed.ncbi.nlm.nih.gov/18262772","citation_count":27,"is_preprint":false},{"pmid":"24777815","id":"PMC_24777815","title":"Regulation of Gβγi-dependent PLC-β3 activity in smooth muscle: inhibitory phosphorylation of PLC-β3 by PKA and PKG and stimulatory phosphorylation of Gαi-GTPase-activating protein RGS2 by PKG.","date":"2014","source":"Cell biochemistry and biophysics","url":"https://pubmed.ncbi.nlm.nih.gov/24777815","citation_count":27,"is_preprint":false},{"pmid":"27701409","id":"PMC_27701409","title":"RGS2 expression predicts amyloid-β sensitivity, MCI and Alzheimer's disease: genome-wide transcriptomic profiling and bioinformatics data mining.","date":"2016","source":"Translational psychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/27701409","citation_count":26,"is_preprint":false},{"pmid":"25740197","id":"PMC_25740197","title":"RGS2 ggenetic variation: association analysis with panic disorder and dimensional as well as intermediate phenotypes of anxiety.","date":"2015","source":"American journal of medical genetics. Part B, Neuropsychiatric genetics : the official publication of the International Society of Psychiatric Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/25740197","citation_count":26,"is_preprint":false},{"pmid":"24154666","id":"PMC_24154666","title":"Influence of RGS2 on sertraline treatment for social anxiety disorder.","date":"2013","source":"Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/24154666","citation_count":26,"is_preprint":false},{"pmid":"30467386","id":"PMC_30467386","title":"Analysis of regulator of G-protein signalling 2 (RGS2) expression and function during prostate cancer progression.","date":"2018","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/30467386","citation_count":25,"is_preprint":false},{"pmid":"24743392","id":"PMC_24743392","title":"Regulator of G protein signaling 2 (RGS2) and RGS4 form distinct G protein-dependent complexes with protease activated-receptor 1 (PAR1) in live cells.","date":"2014","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/24743392","citation_count":25,"is_preprint":false},{"pmid":"21447383","id":"PMC_21447383","title":"Resistance to age-related, normal body weight gain in RGS2 deficient mice.","date":"2011","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/21447383","citation_count":25,"is_preprint":false},{"pmid":"11322774","id":"PMC_11322774","title":"RGS2: regulation of expression and nuclear localization.","date":"2001","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/11322774","citation_count":24,"is_preprint":false},{"pmid":"10982407","id":"PMC_10982407","title":"RGS4 and RGS2 bind coatomer and inhibit COPI association with Golgi membranes and intracellular transport.","date":"2000","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/10982407","citation_count":24,"is_preprint":false},{"pmid":"22459044","id":"PMC_22459044","title":"RGS2 mediates the anxiolytic effect of oxytocin.","date":"2012","source":"Brain research","url":"https://pubmed.ncbi.nlm.nih.gov/22459044","citation_count":23,"is_preprint":false},{"pmid":"11755214","id":"PMC_11755214","title":"Second messengers regulate RGS2 expression which is targeted to the nucleus.","date":"2001","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/11755214","citation_count":23,"is_preprint":false},{"pmid":"24105430","id":"PMC_24105430","title":"RGS2 regulates urotensin II-induced intracellular Ca2+ elevation and contraction in glomerular mesangial cells.","date":"2014","source":"Journal of cellular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/24105430","citation_count":22,"is_preprint":false},{"pmid":"18230714","id":"PMC_18230714","title":"The RGS2 gene product from a candidate hypertension allele shows decreased plasma membrane association and inhibition of Gq.","date":"2008","source":"Molecular pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/18230714","citation_count":22,"is_preprint":false},{"pmid":"20032508","id":"PMC_20032508","title":"Ischemia induces regulator of G protein signaling 2 (RGS2) protein upregulation and enhances apoptosis in astrocytes.","date":"2009","source":"American journal of physiology. Cell physiology","url":"https://pubmed.ncbi.nlm.nih.gov/20032508","citation_count":22,"is_preprint":false},{"pmid":"32517689","id":"PMC_32517689","title":"Regulators of G-protein signaling, RGS2 and RGS4, inhibit protease-activated receptor 4-mediated signaling by forming a complex with the receptor and Gα in live cells.","date":"2020","source":"Cell communication and signaling : CCS","url":"https://pubmed.ncbi.nlm.nih.gov/32517689","citation_count":22,"is_preprint":false},{"pmid":"26941169","id":"PMC_26941169","title":"Digoxin-Mediated Upregulation of RGS2 Protein Protects against Cardiac Injury.","date":"2016","source":"The Journal of pharmacology and experimental therapeutics","url":"https://pubmed.ncbi.nlm.nih.gov/26941169","citation_count":21,"is_preprint":false},{"pmid":"22120521","id":"PMC_22120521","title":"RGS2 is a negative regulator of STAT3-mediated Nox1 expression.","date":"2011","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/22120521","citation_count":21,"is_preprint":false},{"pmid":"11832360","id":"PMC_11832360","title":"Oxytocin stimulation of RGS2 mRNA expression in cultured human myometrial cells.","date":"2002","source":"American journal of physiology. Endocrinology and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/11832360","citation_count":21,"is_preprint":false},{"pmid":"20847141","id":"PMC_20847141","title":"Renal actions of RGS2 control blood pressure.","date":"2010","source":"Journal of the American Society of Nephrology : JASN","url":"https://pubmed.ncbi.nlm.nih.gov/20847141","citation_count":21,"is_preprint":false},{"pmid":"24973550","id":"PMC_24973550","title":"Regulator of G protein signaling 2 (RGS2) deficiency accelerates the progression of kidney fibrosis.","date":"2014","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/24973550","citation_count":21,"is_preprint":false},{"pmid":"25847876","id":"PMC_25847876","title":"MicroRNA hsa-miR-4717-5p regulates RGS2 and may be a risk factor for anxiety-related traits.","date":"2015","source":"American journal of medical genetics. Part B, Neuropsychiatric genetics : the official publication of the International Society of Psychiatric Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/25847876","citation_count":21,"is_preprint":false},{"pmid":"30305828","id":"PMC_30305828","title":"A bronchoprotective role for Rgs2 in a murine model of lipopolysaccharide-induced airways inflammation.","date":"2018","source":"Allergy, asthma, and clinical immunology : official journal of the Canadian Society of Allergy and Clinical Immunology","url":"https://pubmed.ncbi.nlm.nih.gov/30305828","citation_count":21,"is_preprint":false},{"pmid":"28107494","id":"PMC_28107494","title":"Protective Roles for RGS2 in a Mouse Model of House Dust Mite-Induced Airway Inflammation.","date":"2017","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/28107494","citation_count":21,"is_preprint":false},{"pmid":"36653442","id":"PMC_36653442","title":"RGS2 promotes estradiol biosynthesis by trophoblasts during human pregnancy.","date":"2023","source":"Experimental & molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/36653442","citation_count":20,"is_preprint":false},{"pmid":"25339105","id":"PMC_25339105","title":"Expression and regulation of regulator of G-protein signaling protein-2 (RGS2) in equine and bovine follicles prior to ovulation: molecular characterization of RGS2 transactivation in bovine granulosa cells.","date":"2014","source":"Biology of reproduction","url":"https://pubmed.ncbi.nlm.nih.gov/25339105","citation_count":20,"is_preprint":false},{"pmid":"16733081","id":"PMC_16733081","title":"Cellular stress increases RGS2 mRNA and decreases RGS4 mRNA levels in SH-SY5Y cells.","date":"2006","source":"Neuroscience letters","url":"https://pubmed.ncbi.nlm.nih.gov/16733081","citation_count":20,"is_preprint":false},{"pmid":"28846187","id":"PMC_28846187","title":"Increased fear learning, spatial learning as well as neophobia in Rgs2-/- mice.","date":"2017","source":"Genes, brain, and behavior","url":"https://pubmed.ncbi.nlm.nih.gov/28846187","citation_count":19,"is_preprint":false},{"pmid":"22922103","id":"PMC_22922103","title":"RGS2 is a component of the cellular stress response.","date":"2012","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/22922103","citation_count":18,"is_preprint":false},{"pmid":"30826455","id":"PMC_30826455","title":"RGS2 promotes the translation of stress-associated proteins ATF4 and CHOP via its eIF2B-inhibitory domain.","date":"2019","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/30826455","citation_count":18,"is_preprint":false},{"pmid":"24398995","id":"PMC_24398995","title":"Valproic acid substantially downregulated genes folr1, IGF2R, RGS2, COL6A3, EDNRB, KLF6, and pax-3, N-acetylcysteine alleviated most of the induced gene alterations in chicken embryo model.","date":"2013","source":"Romanian journal of morphology and embryology = Revue roumaine de morphologie et embryologie","url":"https://pubmed.ncbi.nlm.nih.gov/24398995","citation_count":18,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":56096,"output_tokens":10189,"usd":0.160561,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":20689,"output_tokens":6019,"usd":0.12696,"stage2_stop_reason":"end_turn"},"total_usd":0.287521,"stage1_batch_id":"msgbatch_01CNoDbkChHEkgrJnL7BwtGJ","stage2_batch_id":"msgbatch_016Y4x9E9Wg5VQDANj9quSQD","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"RGS2 is a selective and potent inhibitor of Gqα function. RGS2 selectively binds Gqα but not Giα, Goα, Gsα, or G12/13α in brain membranes and in pulldown assays with purified recombinant proteins. RGS2 does not stimulate the GTPase activities of Gsα or Giα family members even at concentrations 3000-fold higher than those sufficient for RGS4 effects on Giα. When reconstituted with phospholipid vesicles, RGS2 is 10-fold more potent than RGS4 in blocking Gqα-directed activation of PLCβ1.\",\n      \"method\": \"Pulldown binding assays (brain membranes and purified recombinant proteins), in vitro GTPase assay, phospholipid vesicle reconstitution with PLCβ1 activation assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified proteins, GTPase assay, and functional PLCβ1 assay; founding mechanistic paper replicated across multiple subsequent studies\",\n      \"pmids\": [\"9405622\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"RGS2 stimulates the GTPase activity of Gqα and Gi1α in biochemical assays. The effect on Gi1 was observed only after reconstitution in phospholipid vesicles containing M2 muscarinic acetylcholine receptors. RGS2 also inhibits both Gq- and Gi-dependent responses in transfected cells.\",\n      \"method\": \"In vitro GTPase assay, phospholipid vesicle reconstitution with M2 muscarinic receptor, transfection-based functional signaling assays\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstituted GTPase assay with multiple orthogonal methods (biochemical and cell-based), single lab\",\n      \"pmids\": [\"9736641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"RGS2 function is governed by quantitative differences in potency toward Gq vs Gi family members: RGS2 is 5-fold more potent than RGS4 as an inhibitor of Gq-stimulated phosphoinositide hydrolysis in vivo, whereas RGS4 is 8-fold more potent than RGS2 as an inhibitor of Gi-mediated signaling. RGS2 mutants were identified that display increased potency toward Gi family members without affecting potency toward Gq, mapping to the switch I binding pocket geometry and the α8–α9 loop interacting with αA of Gi class α subunits.\",\n      \"method\": \"Cell-based phosphoinositide hydrolysis assay, RGS2 mutational analysis, structural inference from RGS4–Giα1 crystal structure\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mutagenesis with functional readouts and structural context; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"10567399\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"PKC phosphorylates RGS2 in vitro to near-stoichiometric levels using both a mixture of PKC isozymes and individual calcium/phospholipid-dependent PKC isoforms. RGS2 is also phosphorylated in intact COS7 cells in response to PKC activation by PMA and, to a lesser extent, by the P2Y2 receptor agonist UTP. In vitro phosphorylation of RGS2 by PKC decreased its capacity to attenuate GTP- and GTPγS-stimulated PLCβ activation, and the extent of inhibition correlated with RGS2 phosphorylation level. A phosphorylation-dependent inhibition of RGS2 GAP activity was also observed in proteoliposomes reconstituted with purified P2Y1 receptor and Gqαβγ.\",\n      \"method\": \"In vitro kinase assay with purified PKC, 32P labeling in intact COS7 cells, proteoliposome reconstitution assay, PLCβ activation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay plus reconstitution in proteoliposomes plus cellular phosphorylation, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"11063746\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"RGS2 contains a conserved N-terminal amphipathic α-helix domain that is necessary and sufficient for plasma membrane localization. This domain binds vesicles containing acidic phospholipids. Activated Gq increases RGS2 association with the plasma membrane and decreases its nuclear accumulation. The RGS2 N terminus directs nuclear accumulation of GFP and enters the nucleus by passive diffusion despite possessing a nuclear targeting motif but lacking a nuclear import signal. Excluding RGS2 from the nucleus did not affect its ability to attenuate Gq signaling.\",\n      \"method\": \"GFP-fusion live-cell confocal microscopy, liposome binding assay, mutational analysis, truncation constructs, fluorescence/CD biophysical analysis of the amphipathic helix\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiments with functional consequences tested, multiple mutants, biophysical validation, single lab\",\n      \"pmids\": [\"11278586\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"RGS2 directly inhibits the activity of type V adenylyl cyclase (AC) by binding to its C1 domain (not C2 domain). The interaction requires the N-terminal 19 amino acids of RGS2; the C terminus, RGS GAP activity, and RGS box domain are not required. Alanine scanning of the N terminus identified three residues essential for AC inhibition. This inhibition of cAMP accumulation is independent of Giα inhibition.\",\n      \"method\": \"Co-immunoprecipitation, deletion mutagenesis, alanine scanning mutagenesis, cAMP accumulation assay in HEK293 cells expressing type V AC\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple mutagenesis strategies with direct binding domain mapping, cAMP functional assay, single lab\",\n      \"pmids\": [\"12604604\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"GFP-RGS2 localizes to the nucleus in HEK293 cells and is selectively recruited to the plasma membrane when co-expressed with Gαs, β2-adrenergic receptor, Gαq, or AT1A angiotensin II receptor, but not by Gi-coupled receptors or G protein mutants with reduced RGS affinity. This recruitment involves direct binding to G proteins and is independent of downstream signaling events. RGS2 inhibited Gs-dependent increases in intracellular cAMP, consistent with its selective recruitment by Gs.\",\n      \"method\": \"GFP-tagged RGS2 confocal microscopy, co-expression with wild-type and mutant Gα subunits and GPCRs, steady-state Gi GTPase activity assay, cAMP accumulation assay\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — direct localization experiments with G protein mutant controls and functional signaling readouts, single lab\",\n      \"pmids\": [\"12920194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"RGS2 binds directly and selectively to the third intracellular (i3) loop of the M1 muscarinic acetylcholine receptor (M1 mAChR). The N-terminal region of RGS2 is both necessary and sufficient for binding to M1i3. RGS2 forms a stable heterotrimeric complex with activated Gqα and M1i3. Deletion of the N terminus abolishes RGS2 effector antagonist activity but not its GAP activity toward G11α. RGS2 and M1 mAChR co-localize at the plasma membrane. Closely related RGS16 does not bind M1i3, and neither protein binds M2i3.\",\n      \"method\": \"GST pulldown (in vitro binding), co-localization by fluorescence microscopy, phosphoinositide hydrolysis assay in cell membranes, N-terminal deletion constructs, co-immunoprecipitation of ternary complex\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct in vitro binding plus cellular co-localization plus functional assay plus mutagenesis, replicated across multiple receptor subtypes\",\n      \"pmids\": [\"14976183\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The scaffold protein spinophilin (SPL) binds the N-terminal domain of RGS2 and also binds the third intracellular loop (3iL) of several GPCRs including the α-adrenergic receptor (αAR). When expressed in Xenopus oocytes, SPL markedly increased RGS2 inhibition of αAR Ca2+ signaling. A constitutively active αAR mutant (A293E) in the 3iL did not bind SPL and was relatively resistant to RGS2 inhibition. In rgs2−/− cells, αAR-evoked Ca2+ signaling is less sensitive to SPL inhibition, and in spl−/− cells less sensitive to RGS2 inhibition.\",\n      \"method\": \"Co-immunoprecipitation, GST pulldown, Xenopus oocyte electrophysiology/Ca2+ assay, αAR–βAR chimeras, knockout cell assays\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, functional rescue experiments in oocytes, double-knockout cell assays, multiple orthogonal methods\",\n      \"pmids\": [\"15793568\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"RGS2 binds directly and selectively to the third intracellular loop of the α1A-adrenergic receptor (α1A-AR) in vitro and is recruited by the unstimulated α1A-AR to the plasma membrane in cells to inhibit Gq/11 signaling. The N terminus of RGS2 is required for this interaction. Residues Lys219, Ser220, and Arg238 within the α1A-AR i3 loop are essential. RGS2 does not interact with the highly homologous α1B- or α1D-ARs, and RGS16 does not interact with any α1-AR.\",\n      \"method\": \"GST pulldown (in vitro), confocal fluorescence imaging of RGS2 recruitment, phosphoinositide hydrolysis assay, site-directed mutagenesis of receptor i3 loop\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding plus cellular imaging plus functional assay plus mutagenesis, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"15917235\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"RGS2 interacts with Gsα and adenylyl cyclase (AC) isoforms in living cells. Co-expression of AC isoforms (ACI, ACII, ACV, ACVI) recruits GFP-RGS2 to the plasma membrane. BRET signals were detected between RGS2-Rluc and Gsα-GFP, and between GFP-RGS2 and ACII-Rluc or ACVI-Rluc. Purified RGS2 selectively bound the third intracellular loop of the β2-AR in GST pulldown, and a BRET signal between GFP-RGS2 and β2-AR-Rluc was detected only when AC was co-expressed, suggesting AC stabilizes or promotes RGS2–receptor binding.\",\n      \"method\": \"GFP-RGS2 confocal localization, BRET (bioluminescence resonance energy transfer), GST pulldown with purified proteins\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — BRET and GST pulldown with multiple AC isoforms, single lab, two orthogonal methods\",\n      \"pmids\": [\"16095880\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"RGS2 directly interacts with the NH2-terminal domain of TRPV6 (identified by yeast two-hybrid and GST pulldown). RGS2 overexpression reduces Na+ and Ca2+ current through TRPV6 but not TRPV5 in HEK293 cells. The ΔN-RGS2 deletion mutant lacking the NH2-terminal domain does not inhibit TRPV6 current. Cell surface biotinylation showed the inhibitory effect is not mediated by altered TRPV6 trafficking. The scaffolding protein spinophilin does not affect RGS2–TRPV6 binding or electrophysiology, indicating a GPCR-independent mechanism.\",\n      \"method\": \"Yeast two-hybrid, GST pulldown, whole-cell patch clamp electrophysiology, cell surface biotinylation, deletion mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — yeast two-hybrid confirmed by GST pulldown, functional electrophysiology with deletion mutants and surface biotinylation, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"16895908\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"RGS2 directly interacts with tubulin via amino acids 41–60 at its N-terminus and enhances microtubule polymerization in vitro. The tubulin binding region is necessary and sufficient for this activity. In Vero cells, microinjection of peptides containing the tubulin-binding region stimulated microtubule polymerization. Endogenous RGS2 localizes to the termini of neurites in differentiated PC12 cells. RGS2 overexpression enhanced NGF-induced neurite outgrowth, while RGS2 knockdown suppressed it.\",\n      \"method\": \"Co-immunoprecipitation with tubulin, in vitro microtubule polymerization assay, peptide microinjection in Vero cells, immunocytochemistry, PC12 neurite outgrowth assay with overexpression and siRNA knockdown\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro polymerization assay plus cell-based localization and functional readout, single lab, multiple methods\",\n      \"pmids\": [\"16820281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"RGS2 determines short-term synaptic plasticity in hippocampal neurons by downregulating Gi/o-mediated presynaptic Ca2+ channel inhibition, thereby increasing synaptic vesicle release. This was established by comparing electrophysiological recordings from RGS2 knockout and wild-type mice.\",\n      \"method\": \"Electrophysiological recordings from hippocampal neurons in RGS2 knockout vs. wild-type mice\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function (knockout) with defined electrophysiological phenotype in neurons, clean mechanistic interpretation\",\n      \"pmids\": [\"16950156\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"RGS2 modulates the coupling efficiency between GABA(B) receptors and GIRK channels in dopamine neurons of the ventral tegmental area. In DA neurons, low coupling efficiency reflects selective expression of heteromeric GIRK2/3 channels and is dynamically modulated by RGS2. Repetitive exposure to GHB increases GABA(B) receptor–GIRK channel coupling efficiency through downregulation of RGS2.\",\n      \"method\": \"Electrophysiology in VTA DA and GABA neurons from mice, RGS2 knockdown/downregulation experiments with GHB exposure\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology in specific neuronal subtypes with pharmacological and molecular manipulation, replicated across conditions\",\n      \"pmids\": [\"17965710\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"cGMP-dependent protein kinase type Iα (cGKIα) phosphorylates RGS2, promoting its association with the plasma membrane (via its cGKIα phosphorylation sites) and increasing its GAP activity. RGS2 is degraded in vascular smooth muscle cells via the proteasome. Inhibition of cGK activity blunts RGS2 degradation, but inactivation of the cGKIα phosphorylation sites in RGS2 does not stabilize the protein, indicating cGK regulates RGS2 degradation through other mechanisms. RGS2 is required for cGMP-mediated inhibition of vasoconstrictor-elicited PLCβ activation, Ca2+ store release, and capacitative Ca2+ entry.\",\n      \"method\": \"Phosphorylation assay, confocal microscopy of RGS2 plasma membrane association, proteasome inhibitor treatment, Ca2+ signaling assays in VSMCs from RGS2-deficient and wild-type mice\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phosphorylation site mutagenesis, knockout mouse VSMCs, multiple signaling readouts, single lab\",\n      \"pmids\": [\"17681944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"A human hypertension-associated RGS2 missense mutation R44H (within the N-terminal amphipathic α-helix) results in decreased plasma membrane association and weaker inhibition of receptor-mediated Gq signaling compared to wild-type RGS2. Tryptophan fluorescence and circular dichroism studies showed that R44H prevents proper entrenchment of hydrophobic residues into the lipid bilayer without disrupting helix-forming capacity. The R44H protein does not act as a dominant-negative.\",\n      \"method\": \"Confocal microscopy (YFP-tagged constructs), tryptophan fluorescence spectroscopy, circular dichroism, Gq signaling functional assay\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — biophysical characterization of mutant (CD + fluorescence) plus cellular localization plus functional assay, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"18230714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"RGS2 binds eIF2Bε (eukaryotic initiation factor 2B epsilon subunit) and inhibits mRNA translation. This effect was not observed for other RGS proteins tested. The translation-inhibitory function maps to a 37-amino acid stretch within the conserved RGS domain and is distinct from RGS2's G protein GAP activity. RGS2 interferes with the eIF2–eIF2B GTPase cycle required for initiation of mRNA translation.\",\n      \"method\": \"Co-immunoprecipitation (RGS2–eIF2Bε binding), in vitro translation assay, domain mapping with deletion constructs, comparison across multiple RGS family members\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding by co-IP with functional translation assay and domain-mapping mutagenesis, single lab, two orthogonal methods\",\n      \"pmids\": [\"19736320\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Structural determinants of RGS2 Gα selectivity were identified by x-ray crystallography. A trio of point mutations in RGS2 confers Gαi-directed binding and GAP activities without perturbing Gαq association. Crystal structure of the triple-mutant RGS2 in complex with transition-state Gαi was solved at 2.8 Å resolution. These three amino acids are evolutionarily conserved among organisms with modern cardiovascular systems, suggesting RGS2 specialized as a potent Gαq GAP.\",\n      \"method\": \"X-ray crystallography (2.8 Å), site-directed mutagenesis, in vitro GAP activity assay, Gα binding assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with mutagenesis and functional GAP assay, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"19478087\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ANP/GC-A/cGMP signaling selectively suppresses Ang II (Gαq-mediated) but not isoproterenol (Gαs-mediated) Ca2+ currents and transients in cardiomyocytes. This suppression is abolished in cardiomyocytes deficient in GC-A, PKG I, or RGS2 (a target of PKG I), establishing RGS2 as a required downstream effector of the PKG I-mediated pathway that antagonizes Ang II/AT1 signaling.\",\n      \"method\": \"Voltage-clamp recordings, fluorescence Ca2+ imaging in isolated cardiomyocytes, cardiomyocyte-conditional GC-A KO mice, PKG I KO and RGS2 KO mice\",\n      \"journal\": \"Basic research in cardiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function in three KO mouse models with electrophysiological and Ca2+ readouts, epistasis established, single study\",\n      \"pmids\": [\"20352235\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RGS2 is required for LABA-induced bronchoprotection. In primary human airway smooth muscle cells, glucocorticoid/LABA combinations synergistically induce RGS2 expression. RGS2 reduced intracellular free Ca2+ flux elicited by histamine, methacholine, leukotrienes, and other spasmogens. Protection against spasmogen-increased Ca2+ following 6 h of LABA plus corticosteroid treatment was dependent on RGS2. Rgs2-deficient mice showed enhanced bronchoconstriction to spasmogens and absence of LABA-induced bronchoprotection.\",\n      \"method\": \"Ca2+ flux assay in human airway smooth muscle cells, RGS2 siRNA knockdown, Rgs2-/- mouse bronchoconstriction assay, gene expression analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human cell loss-of-function plus Rgs2 KO mouse phenotype, multiple agonists tested, functional mechanism established\",\n      \"pmids\": [\"22080612\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RGS2 is a novel interacting partner of LRRK2 in vivo and regulates both the GTPase and kinase activities of LRRK2. RGS2 regulates LRRK2-dependent control of neuronal process length in mammalian neurons, and is protective against neuronal toxicity of the LRRK2 G2019S mutation. RGS2 regulation of LRRK2 function occurs through effects on kinase activity independently of GTPase activity.\",\n      \"method\": \"Co-immunoprecipitation (in vivo interaction), kinase and GTPase activity assays, neuronal process length measurement, toxicity assay in mammalian neurons\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus functional kinase/GTPase assays plus neuronal phenotype, single lab, multiple methods\",\n      \"pmids\": [\"24794857\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RGS2 interacts with PAR1 (protease-activated receptor 1) in a Gαq/11-dependent manner in live cells. Very little BRET activity is observed between PAR1 and RGS2 in the absence of Gα, but is markedly enhanced by Gαq/11. PAR1 mutant R205A (eliminating Gq/11 coupling) blocks this interaction. The purified intracellular third loop of PAR1 binds directly to purified His-RGS2. RGS2 inhibits PAR1/Gα-mediated calcium and MAPK/ERK signaling but not RhoA signaling.\",\n      \"method\": \"BRET in live COS-7 cells, GST pulldown with purified proteins, Ca2+ signaling assay, ERK phosphorylation assay, RhoA activity assay, site-directed mutagenesis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — BRET confirmed by direct in vitro pulldown plus multiple functional signaling assays, single lab\",\n      \"pmids\": [\"24743392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"RGS2 protein is degraded through the ubiquitin-proteasome system via a novel E3 ligase complex containing cullin 4B (CUL4B), DDB1, and F-box protein 44 (FBXO44). The more typical SCF complex (CUL1/Skp1/FBXO44) can bind FBXO44 but does not bind RGS2 and is not involved in its degradation.\",\n      \"method\": \"Genome-wide siRNA screen, co-immunoprecipitation, proteasome inhibitor assays, knockdown experiments\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA screen confirmed by co-IP, single lab, functional proteasomal degradation assay\",\n      \"pmids\": [\"25970626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"RGS2 protein is polyubiquitinated at residue K71 and undergoes proteasomal degradation. The deubiquitinase MCPIP1 stabilizes RGS2 protein; a dominant-negative MCPIP1 mutant (C157A) does not affect RGS2 levels. MG-132 treatment increased both endogenous and exogenous RGS2, indicating proteasomal regulation.\",\n      \"method\": \"Ubiquitination assay with K71 mutagenesis, proteasome inhibitor (MG-132) treatment, MCPIP1 overexpression and dominant-negative mutant, immunoblotting\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-specific ubiquitination mutagenesis and proteasome assay with deubiquitinase, single lab\",\n      \"pmids\": [\"25187114\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RGS2 promotes translation of ATF4 and CHOP by a mechanism involving its eIF2B-interacting domain (RGS2eb). Expression of full-length RGS2 or RGS2eb significantly increases ATF4 and CHOP protein levels. These effects are translationally regulated and independent of eIF2α phosphorylation.\",\n      \"method\": \"RGS2 and domain overexpression, immunoblotting for ATF4/CHOP, translation assay, eIF2α phosphorylation analysis\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-specific construct (RGS2eb) with functional translation readout, single lab, two orthogonal indicators\",\n      \"pmids\": [\"30826455\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RGS2 causes prolonged translational arrest in slow-cycling/dormant cancer cells (SCCs) through persistent eIF2α phosphorylation via proteasome-mediated degradation of ATF4 (activating transcription factor 4). RGS2 antagonism or phosphodiesterase 5 inhibitors promoted ER stress-induced apoptosis in SCCs under stressed conditions.\",\n      \"method\": \"Proliferation-sensitive dye labeling, chemotherapeutic selection, lentiviral RGS2 overexpression/knockdown, eIF2α phosphorylation assay, ATF4 protein stability assay with proteasome inhibitors, in vitro and in vivo apoptosis assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic pathway (RGS2→eIF2α phosphorylation→ATF4 degradation) established with multiple cell/mouse experiments, single lab\",\n      \"pmids\": [\"33393490\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RGS2 downregulation in striatal neurons of Huntington's disease models is a compensatory response. Silencing RGS2 in cultured rat primary striatal neurons reduced mutant huntingtin fragment toxicity and enhanced ERK activation, establishing a link between RGS2 inhibition and neuroprotective ERK signaling.\",\n      \"method\": \"Lentiviral shRNA knockdown in primary striatal neurons, cell viability assay, ERK phosphorylation assay, lentiviral RGS2 overexpression\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — lentiviral knockdown and overexpression with defined cell viability and ERK signaling readouts, single lab\",\n      \"pmids\": [\"21779398\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"PKG (but not PKA) phosphorylates RGS2 at Ser46 and Ser64 in gastrointestinal smooth muscle and enhances association of Gαi3-GTP with RGS2, thereby accelerating Gαi GTPase activity, enhancing Gαβγi trimer reassembly, and inhibiting Gβγi-dependent PLCβ3 activity. Expression of phosphorylation-site-deficient RGS2 (S46A/S64A) or RGS2 siRNA partially reversed the effect of GSNO on PI hydrolysis.\",\n      \"method\": \"PKG phosphorylation assay, co-immunoprecipitation of Gαi3 and RGS2, PI hydrolysis assay, phosphorylation-site mutagenesis (S46A/S64A), siRNA knockdown\",\n      \"journal\": \"Cell biochemistry and biophysics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phosphorylation site mutagenesis plus co-IP plus functional PI hydrolysis assay, single lab, multiple methods\",\n      \"pmids\": [\"24777815\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"RGS2 directly binds STAT3 in the nucleus and represses STAT3-mediated transcriptional activation of Nox1. A GFP-tagged RGS2 concentrates in the nucleus and directly binds STAT3, inhibiting its transcriptional activity. RGS2 expression is itself repressed by TLR2 signaling.\",\n      \"method\": \"Co-immunoprecipitation (RGS2–STAT3 binding), GFP-RGS2 confocal localization, Nox1 reporter assay, siRNA knockdown\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — direct binding by co-IP plus nuclear localization plus transcriptional reporter, single lab\",\n      \"pmids\": [\"22120521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"RGS2 accelerates the speed of ACh-mediated activation and deactivation of GIRK1/2 and GIRK1/4 currents in Xenopus oocytes. Two point mutations in RGS2 (N109S and L180F) reduced the acceleration of current amplification after ACh application on GIRK1/4 channels compared with wild-type RGS2. Pertussis toxin completely abolished ACh-mediated current amplification with or without RGS2, indicating RGS2 acts on Gi/o.\",\n      \"method\": \"Xenopus oocyte whole-cell electrophysiology, RGS2 co-expression with GIRK and mAChR subunits, site-directed mutagenesis, pertussis toxin treatment\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology in oocytes with mutagenesis and pharmacological controls, single lab\",\n      \"pmids\": [\"10332086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Loss of RGS2 in mice increases agonist potency and efficacy for P2Y receptor-mediated Ca2+ signaling in vascular smooth muscle cells and slows the kinetics of signal termination, resulting in prolonged vasoconstriction and hypertension.\",\n      \"method\": \"RGS2-/- and RGS2+/- mouse model; in vivo blood pressure telemetry; in vitro vascular smooth muscle cell Ca2+ imaging\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout mouse with in vivo blood pressure phenotype and in vitro cellular Ca2+ mechanistic readout, extensively replicated\",\n      \"pmids\": [\"12588882\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Renal RGS2 is sufficient to control blood pressure: kidney cross-transplantation in RGS2-deficient mice showed that loss of renal RGS2 was sufficient to cause hypertension, whereas absence of RGS2 from all extrarenal tissues (including peripheral vasculature) did not significantly alter blood pressure.\",\n      \"method\": \"Kidney cross-transplantation in total body RGS2-deficient and wild-type mice, blood pressure measurement\",\n      \"journal\": \"Journal of the American Society of Nephrology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis via organ transplantation strategy, clean functional readout, single lab\",\n      \"pmids\": [\"20847141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"RGS2 enhances estradiol biosynthesis in trophoblasts by promoting proteasomal degradation of HAND1 (a trans-inactivator of the aromatase gene) through suppression of USP14-mediated deubiquitination of HAND1, thereby increasing aromatase expression and E2 production. However, aromatase binds to RGS2 and represses its GAP activity.\",\n      \"method\": \"JEG-3 cell overexpression/knockdown, protein stability assays, co-immunoprecipitation (RGS2–aromatase, RGS2–USP14), ubiquitination assay for HAND1, E2 ELISA, reporter assays\",\n      \"journal\": \"Experimental & molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus functional ubiquitination/stability assay plus E2 output, single lab, multiple methods\",\n      \"pmids\": [\"36653442\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RGS2 is a GTPase-accelerating protein (GAP) that selectively and potently accelerates GTP hydrolysis by Gqα (and to a lesser extent Gi under receptor-reconstituted conditions), thereby terminating G protein-coupled receptor signaling; its N-terminal amphipathic helix targets it to the plasma membrane by binding acidic phospholipids and directly engaging the third intracellular loops of specific GPCRs (M1 mAChR, α1A-AR, β2-AR, PAR1) in a complex also organized by the scaffold spinophilin, while its N-terminus independently inhibits adenylyl cyclase by binding the AC C1 domain; RGS2 is subject to PKC- and PKG-mediated phosphorylation (modulating GAP activity and membrane association), proteasomal degradation via a CUL4B/DDB1/FBXO44 E3 ligase complex, and polyubiquitination at K71 stabilized by MCPIP1; in addition to G protein regulation, RGS2 directly inhibits mRNA translation by binding eIF2Bε to interfere with the eIF2–eIF2B GTPase exchange cycle, promotes translation of stress-response factors ATF4 and CHOP through persistent eIF2α phosphorylation, interacts with tubulin to promote microtubule polymerization and neurite outgrowth, binds STAT3 in the nucleus to repress Nox1 transcription, and modulates LRRK2 kinase activity; physiologically, RGS2 is a critical regulator of blood pressure (primarily through renal Gq signaling), cardiac hypertrophy, synaptic plasticity, bronchoprotection, and cell dormancy.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RGS2 is a GTPase-accelerating protein (GAP) that selectively and potently terminates Gq-coupled GPCR signaling, functioning as a critical brake on calcium-mobilizing pathways across vascular, cardiac, airway, and neuronal tissues [#0, #31]. It binds Gqalpha but not other Galpha families and is markedly more potent than RGS4 at inhibiting Gq-directed PLCbeta activation, with quantitative potency differences toward Gi versus Gq mapping to defined residues in the switch I binding pocket and alpha8-alpha9 loop; crystallography of a triple-mutant RGS2-Galphai complex established that three conserved residues specialized RGS2 as a dedicated Gq GAP [#0, #2, #18]. Beyond catalytic GAP activity, RGS2 acts as a receptor-proximal effector antagonist: its N-terminal amphipathic helix binds acidic phospholipids to target the plasma membrane and directly engages the third intracellular loops of specific receptors including M1 mAChR, alpha1A-AR, beta2-AR, and PAR1, frequently organized by the scaffold spinophilin and in some cases stabilized by activated Gq or adenylyl cyclase [#4, #7, #9, #8, #22]. The same N-terminal region independently inhibits type V adenylyl cyclase by binding its C1 domain, decoupling cAMP suppression from GAP function [#5]. RGS2 activity and abundance are tightly regulated by PKC and cGMP-dependent protein kinase (cGKI/PKG) phosphorylation, which modulate GAP activity and membrane association, and by proteasomal turnover through a CUL4B/DDB1/FBXO44 E3 ligase complex and K71 polyubiquitination opposed by the deubiquitinase MCPIP1 [#3, #15, #28, #23, #24]. RGS2 also carries G-protein-independent functions: a 37-residue segment within its RGS domain binds eIF2Bepsilon to inhibit mRNA translation and reprogram stress responses through ATF4/CHOP and persistent eIF2alpha phosphorylation, driving translational arrest in dormant cancer cells; it binds tubulin to promote microtubule polymerization and neurite outgrowth, binds STAT3 in the nucleus to repress Nox1 transcription, and modulates LRRK2 kinase activity [#17, #25, #26, #12, #29, #21]. Physiologically, RGS2 controls blood pressure principally through renal Gq signaling, mediates ANP/cGMP/PKG antagonism of angiotensin signaling in cardiomyocytes, governs LABA-induced airway smooth muscle bronchoprotection, and shapes short-term synaptic plasticity and GABA(B)-GIRK coupling in neurons [#31, #32, #20, #21, #13, #14]. A human hypertension-associated R44H mutation in the N-terminal helix impairs membrane association and Gq inhibition, directly linking RGS2 to blood pressure regulation [#16].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Established RGS2 as a selective, potent inhibitor of Gqalpha, defining its founding biochemical identity distinct from other RGS proteins.\",\n      \"evidence\": \"Pulldown binding, in vitro GTPase assay, and phospholipid vesicle reconstitution with PLCbeta1 activation\",\n      \"pmids\": [\"9405622\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve structural basis of Gq selectivity\", \"Receptor-coupled specificity in cells not yet defined\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Showed RGS2 can also accelerate Gi1alpha GTPase activity under receptor-reconstituted conditions, defining context-dependent G protein selectivity.\",\n      \"evidence\": \"In vitro GTPase assay with M2 muscarinic receptor reconstitution and transfection-based signaling\",\n      \"pmids\": [\"9736641\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological relevance of Gi activity versus dominant Gq role unclear\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Quantified the Gq-versus-Gi potency differences distinguishing RGS2 from RGS4 and mapped selectivity-determining residues, framing RGS2 as a Gq-specialized GAP and demonstrating GIRK current modulation via Gi/o.\",\n      \"evidence\": \"Cell-based phosphoinositide hydrolysis, RGS2 mutagenesis, and Xenopus oocyte GIRK electrophysiology with pertussis toxin controls\",\n      \"pmids\": [\"10567399\", \"10332086\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"High-resolution structure of selectivity determinants not yet available\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Identified the N-terminal amphipathic helix as necessary and sufficient for plasma membrane targeting via acidic phospholipid binding, explaining how RGS2 reaches its receptor/G protein substrates.\",\n      \"evidence\": \"GFP live-cell microscopy, liposome binding, and biophysical (CD/fluorescence) analysis of the helix\",\n      \"pmids\": [\"11278586\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Nuclear function of RGS2 not resolved at this stage\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Revealed a GAP-independent function: the N-terminus directly inhibits type V adenylyl cyclase via its C1 domain, and showed selective G-protein/receptor-driven membrane recruitment.\",\n      \"evidence\": \"Co-IP, deletion and alanine-scanning mutagenesis, cAMP assays, and GFP recruitment by Galphas/Galphaq and receptors; in vivo blood pressure phenotyping of RGS2 knockouts\",\n      \"pmids\": [\"12604604\", \"12920194\", \"12588882\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether AC inhibition contributes to in vivo phenotypes untested\", \"Mechanism of recruitment specificity incompletely defined\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrated direct, selective binding of the RGS2 N-terminus to the M1 mAChR i3 loop, establishing RGS2 as a receptor-targeted effector antagonist separable from its GAP activity.\",\n      \"evidence\": \"GST pulldown, co-localization, ternary complex co-IP, and N-terminal deletion with phosphoinositide assays across receptor subtypes\",\n      \"pmids\": [\"14976183\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Scaffolding that organizes the receptor-RGS2 complex not yet identified\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identified spinophilin as a scaffold bridging RGS2 to GPCR i3 loops and extended direct receptor binding to alpha1A-AR and adenylyl cyclase isoforms, defining the architecture of receptor-proximal RGS2 recruitment.\",\n      \"evidence\": \"Reciprocal co-IP, GST pulldown, BRET, Xenopus oocyte Ca2+ assays, and single/double knockout cell assays\",\n      \"pmids\": [\"15793568\", \"15917235\", \"16095880\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and dynamics of the full receptor-RGS2-spinophilin complex unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Uncovered GPCR-independent roles: direct binding to TRPV6 channels, tubulin-driven microtubule polymerization and neurite outgrowth, and nuclear STAT3 binding repressing Nox1, broadening RGS2's functional repertoire.\",\n      \"evidence\": \"Yeast two-hybrid, GST pulldown, patch clamp, in vitro polymerization, PC12 outgrowth assays, and Nox1 reporter assays\",\n      \"pmids\": [\"16895908\", \"16820281\", \"22120521\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo significance of TRPV6, tubulin, and STAT3 interactions not established\", \"Several rely on overexpression in single labs\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Established cGKIalpha/PKG phosphorylation as a positive regulator of RGS2 membrane association and GAP activity and defined RGS2's role in synaptic plasticity and GABA(B)-GIRK coupling, linking second-messenger control to function.\",\n      \"evidence\": \"Phosphorylation-site mutagenesis, confocal microscopy, VSMC Ca2+ assays, and hippocampal/VTA electrophysiology in knockout mice\",\n      \"pmids\": [\"17681944\", \"16950156\", \"17965710\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which cGK regulates RGS2 degradation distinct from phosphorylation sites unresolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Linked RGS2 to human hypertension by showing the R44H N-terminal mutation impairs membrane entrenchment and Gq inhibition, providing direct genetic-mechanistic evidence for the blood pressure role.\",\n      \"evidence\": \"Confocal microscopy, tryptophan fluorescence, circular dichroism, and Gq functional assays of the mutant\",\n      \"pmids\": [\"18230714\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causality in human hypertension cohorts not addressed here\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined a GAP-independent translational-control function: RGS2 binds eIF2Bepsilon via a 37-residue RGS-domain segment to inhibit mRNA translation, and crystallography resolved the structural basis of Gq selectivity.\",\n      \"evidence\": \"Co-IP, in vitro translation and domain mapping; x-ray crystallography of triple-mutant RGS2-Galphai with GAP assays\",\n      \"pmids\": [\"19736320\", \"19478087\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological contexts where translational versus GAP function dominates unclear at this stage\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Localized blood pressure control to renal RGS2 and established RGS2 as the required downstream effector of cardiac ANP/GC-A/PKG antagonism of angiotensin Gq signaling.\",\n      \"evidence\": \"Kidney cross-transplantation in RGS2-deficient mice and voltage-clamp/Ca2+ imaging in GC-A, PKG I, and RGS2 knockout cardiomyocytes\",\n      \"pmids\": [\"20847141\", \"20352235\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Renal cell type and signaling pathway mediating the effect not fully defined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated RGS2 is required for glucocorticoid/LABA-induced airway smooth muscle bronchoprotection against multiple spasmogens, extending its Gq-braking role to respiratory physiology.\",\n      \"evidence\": \"Ca2+ flux in human ASM cells with siRNA and Rgs2-/- mouse bronchoconstriction assays\",\n      \"pmids\": [\"22080612\", \"21779398\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transcriptional induction mechanism by glucocorticoid/LABA only partially defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Expanded the interactome to LRRK2 (regulating its kinase activity and neuroprotection), PAR1 (Gq/11-dependent receptor binding), and defined PKG phosphorylation at Ser46/Ser64 promoting Gi3 GAP activity.\",\n      \"evidence\": \"Co-IP, kinase/GTPase assays, BRET, GST pulldown, PI hydrolysis assays, and phosphorylation-site mutagenesis\",\n      \"pmids\": [\"24794857\", \"24743392\", \"24777815\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"LRRK2 and PAR1 interactions from single labs without reciprocal in vivo validation\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined the proteostatic control of RGS2 abundance through a non-canonical CUL4B/DDB1/FBXO44 E3 ligase and K71 polyubiquitination opposed by the deubiquitinase MCPIP1.\",\n      \"evidence\": \"Genome-wide siRNA screen, co-IP, K71 mutagenesis, and proteasome inhibitor assays\",\n      \"pmids\": [\"25970626\", \"25187114\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Signals triggering CUL4B complex assembly on RGS2 unknown\", \"Interplay between the two degradation routes unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Connected RGS2's eIF2B-binding domain to selective promotion of ATF4 and CHOP translation, defining its role in the integrated stress response independent of eIF2alpha phosphorylation.\",\n      \"evidence\": \"Full-length and RGS2eb domain overexpression with ATF4/CHOP immunoblotting and translation assays\",\n      \"pmids\": [\"30826455\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism reconciling translation inhibition with selective ATF4/CHOP enhancement incompletely defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established RGS2 as a driver of cancer cell dormancy through persistent eIF2alpha phosphorylation and proteasomal ATF4 degradation, identifying it as a therapeutic vulnerability.\",\n      \"evidence\": \"Dye-labeled slow-cycling cell selection, lentiviral perturbation, eIF2alpha/ATF4 assays, and in vivo apoptosis assays\",\n      \"pmids\": [\"33393490\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Generalizability across tumor types not established\", \"Single-lab mechanistic model\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Revealed a reproductive role in which RGS2 enhances trophoblast estradiol biosynthesis by promoting HAND1 degradation via USP14 suppression, with reciprocal repression of RGS2 GAP activity by aromatase.\",\n      \"evidence\": \"JEG-3 overexpression/knockdown, co-IP, ubiquitination/stability assays, E2 ELISA, and reporter assays\",\n      \"pmids\": [\"36653442\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo placental relevance not tested\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the multiple GAP-independent activities (translation control, tubulin binding, STAT3/Nox1, LRRK2, channel and aromatase interactions) are integrated and prioritized in specific cell types, and what governs the choice between them, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying framework linking GAP and non-GAP functions\", \"Tissue-specific dominance of each function undetermined\", \"Structural basis of most non-G-protein interactions unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 7, 9, 18]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [21]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [17, 25, 26]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [4, 6, 7, 9, 10]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [4, 6, 29]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 7, 9, 22, 31]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [17, 25, 26]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [25, 26]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [13, 14]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"GNAQ\", \"spinophilin\", \"ADRA1A\", \"ADRB2\", \"F2R\", \"EIF2B5\", \"STAT3\", \"LRRK2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}