{"gene":"RGS7BP","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":2005,"finding":"R7BP (RGS7BP) is a novel neuronal protein that forms tight complexes with all four R7 family RGS proteins (RGS6, RGS7, RGS9, RGS11) in brain. Binding occurs via the N-terminal DEP domain of RGS9 interacting with R7BP. R7BP is related to the syntaxin subfamily of SNARE proteins.","method":"Co-immunoprecipitation from striatal brain extracts, in vitro binding assays with recombinant proteins","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP from native tissue plus in vitro reconstitution, replicated across all four R7 family members","pmids":["15632198"],"is_preprint":false},{"year":2005,"finding":"R7BP is palmitoylated near its C-terminus, which targets it to the plasma membrane. Depalmitoylation of R7BP causes translocation of R7BP–R7–Gβ5 complexes from the plasma membrane to the nucleus. Palmitoylated R7BP greatly augments the ability of RGS7 to attenuate GPCR-mediated GIRK channel activation compared with nonpalmitoylated R7BP.","method":"Live-cell imaging, subcellular fractionation, palmitoylation assays, electrophysiology (GIRK channel assay)","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (localization, biochemical, functional electrophysiology) in one study, replicated by subsequent work","pmids":["15897264"],"is_preprint":false},{"year":2006,"finding":"R7BP augments the function of RGS7·Gβ5 complexes specifically by a palmitoylation-dependent plasma membrane-targeting mechanism. Unpalmitoylated R7BP undergoes nuclear/cytoplasmic shuttling. A C-terminal polybasic motif proximal to the palmitoylation acceptor sites mediates nuclear localization, palmitoylation, and plasma membrane targeting. Cytoplasmic RGS7·Gβ5·R7BP heterotrimers and RGS7·Gβ5 heterodimers are equivalently inefficient at regulating GPCR signaling relative to plasma membrane-bound heterotrimers with palmitoylated R7BP.","method":"Site-directed mutagenesis, subcellular localization assays, GPCR signaling/GIRK electrophysiology","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — mutagenesis of palmitoylation/polybasic motif combined with functional signaling assay, single lab but multiple orthogonal methods","pmids":["16867977"],"is_preprint":false},{"year":2006,"finding":"R7BP controls proteolytic stability of RGS9-2: co-expression with R7BP dramatically elevates levels of RGS9-2 and Gβ5 by reducing their rate of proteolysis. The binding site for R7BP in RGS proteins is formed by pairing of the DEP domain with the R7H domain, which interacts with four putative alpha-helices of the R7BP core. RNAi knockdown of R7BP in native striatal neurons decreases RGS9-2 protein levels.","method":"Co-expression studies, degradation kinetics measurement, lentiviral RNAi knockdown in striatal neurons, domain mapping","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (overexpression, knockdown in native neurons, domain mutagenesis) in single study with clear mechanistic outcome","pmids":["17158100"],"is_preprint":false},{"year":2006,"finding":"The C-terminal 21 amino acids of R7BP are necessary and sufficient for plasma membrane and postsynaptic density targeting of RGS9-2·Gβ5·R7BP complexes. This requires synergistic contributions of two elements: a polybasic motif and palmitoylated cysteines. Two functional nuclear localization sequences in R7BP mediate nuclear import upon depalmitoylation.","method":"Site-directed mutagenesis, subcellular fractionation, immunolocalization in differentiated striatal neurons","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — mutagenesis combined with localization in native neurons, single lab, multiple constructs tested","pmids":["16574655"],"is_preprint":false},{"year":2007,"finding":"R7BP binding shields RGS9-2 degradation determinants from lysosomal cysteine proteases, controlling RGS9-2 expression at the posttranslational level in vivo. Additionally, R7BP targets RGS9-2 to the postsynaptic density in neurons, and this complex accumulates postsynaptically during ontogenetic development in concert with increased synaptic signaling demands.","method":"In vivo biochemical analysis, protease inhibitor studies, immunoelectron microscopy, developmental expression profiling","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — mechanistic dissection of protease pathway combined with localization at postsynaptic density in vivo, replicated across developmental time points","pmids":["18094251"],"is_preprint":false},{"year":2007,"finding":"In the retina, R7BP forms complexes predominantly with R7 RGS proteins localized to synaptic projections of retinal neurons (as opposed to R9AP which associates with RGS9/RGS11 in photoreceptors), suggesting differential membrane anchor usage for distinct subcellular compartments.","method":"Co-immunoprecipitation, immunolocalization, knockout mouse analysis","journal":"Molecular and cellular neurosciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and localization in knockout mice, single lab, two complementary methods","pmids":["17442586"],"is_preprint":false},{"year":2007,"finding":"R7BP and Gβ5 protein levels are upregulated during the first 2–3 weeks of postnatal brain development. In Neuro2A cells, R7BP at brain-level expression recruits endogenous RGS7–Gβ5 complexes to the plasma membrane. R7BP immunoreactivity concentrates in neuronal soma, dendrites, and spines, but is absent or low in glia, myelinated axons, and axon terminals. R7-Gβ5-R7BP complexes associate inefficiently with detergent-resistant lipid raft fractions.","method":"Co-immunoprecipitation, cell transfection with subcellular localization assay, immunohistochemistry, detergent-resistant membrane fractionation","journal":"Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — multiple localization and biochemical methods, single lab","pmids":["18248908"],"is_preprint":false},{"year":2008,"finding":"Targeting of RGS7/Gβ5 to the dendritic tips of ON-bipolar cells in the retina occurs independently of its association with R7BP, demonstrating an adapter-independent targeting mechanism for this specific RGS/Gβ5 complex.","method":"In vivo examination in R7BP knockout mice, immunolocalization","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockout mouse combined with localization, single lab, single method per conclusion","pmids":["18842904"],"is_preprint":false},{"year":2009,"finding":"Under normal conditions in striatum, R7BP is predominantly associated with RGS9-2 rather than RGS7. Changes in neuronal excitability or oxygenation causing extracellular calcium entry selectively uncouple RGS9-2 from R7BP, triggering RGS9-2 degradation, while released R7BP then binds RGS7 and recruits it from intracellular pools to the plasma membrane and postsynaptic density — an activity-dependent remodeling mechanism.","method":"Co-immunoprecipitation from striatal tissue under different stimulation conditions, subcellular fractionation, immunolocalization","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and fractionation under defined stimulation conditions in native tissue, single lab","pmids":["19332565"],"is_preprint":false},{"year":2009,"finding":"R7BP complexes with both RGS9-2 and RGS7 in the striatum. R7BP knockout mice show motor coordination deficits and enhanced locomotor response to morphine (consistent with reduced RGS9-2 levels). Striatum-specific knockdown shows cocaine locomotor sensitization depends on RGS7 whose R7BP complex formation is dictated by RGS9-2 expression, revealing concerted interplay between RGS9-2 and RGS7 balanced by shared R7BP.","method":"Knockout mouse behavioral analysis, striatum-specific lentiviral RNAi knockdown, biochemical quantification","journal":"Neuropsychopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO and targeted knockdown with defined behavioral and molecular readouts, single lab","pmids":["20043004"],"is_preprint":false},{"year":2009,"finding":"Gβ5-free recombinant RGS11 binds R7BP with higher affinity (Kd ~308 nM) than Gαoa (Kd ~904 nM), indicating a binding preference for R7BP. A novel direct interaction between Gαoa and R7BP was also identified (Kd ~592 nM).","method":"In vitro binding assay with purified recombinant proteins, equilibrium dissociation constant measurement","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro reconstitution with purified proteins measuring binding affinities, single lab, single study","pmids":["19497306"],"is_preprint":false},{"year":2014,"finding":"RGS7, in cooperation with R7BP, regulates GABABR-GIRK signaling in hippocampal pyramidal neurons. R7BP sets the dynamic range of GIRK responses by serving as the membrane-anchoring subunit for RGS7. Deletion of R7BP alters the magnitude and kinetics of GIRK channel responses to GABAB receptor stimulation.","method":"Knockout mouse electrophysiology, GIRK channel recording in hippocampal pyramidal neurons","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — electrophysiology in defined genetic knockout combined with circuit-level analysis, replicated across multiple measures","pmids":["24755289"],"is_preprint":false},{"year":2016,"finding":"In cerebellar cortex, RGS7/Gβ5/R7BP complexes are co-immunoprecipitable and localized to postsynaptic and presynaptic sites on Purkinje cell dendrites/spines, enriched around excitatory synapses. Deletion of R7BP in mice reduces targeting of both RGS7 and Gβ5 to the plasma membrane in the cerebellar cortex.","method":"Co-immunoprecipitation, immunohistochemistry, electron microscopy, R7BP knockout mouse analysis","journal":"Frontiers in neuroanatomy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP combined with electron microscopy localization in KO mice, single lab","pmids":["27965545"],"is_preprint":false},{"year":2017,"finding":"R7BP knockout mice show diminished scratching responses to multiple pruritogens (cutaneous and intrathecal), demonstrating R7BP is required for normal itch sensation. The pruriceptive defect was rescued by additional knockout of Oprk1 (kappa-opioid receptor), placing R7BP-dependent GAP activity upstream of kappa-opioid receptor-mediated itch inhibition in the pathway.","method":"Knockout mouse behavioral assays, double knockout (R7BP/Oprk1) epistasis, pharmacological challenge with kappa opioid agonists","journal":"Pain","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis (double KO rescue) combined with multiple behavioral paradigms and pharmacological rescue, establishing pathway position","pmids":["28134655"],"is_preprint":false},{"year":2018,"finding":"Crystal structure of the RGS7–Gβ5–R7BP complex reveals unique organizational features including long-range conformational changes imposed by constituent subunits during allosteric modulation, with multiple intermolecular interfaces working in synergy.","method":"X-ray crystallography, molecular dynamics simulation, mass spectrometry","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with molecular dynamics and MS, multiple orthogonal structural methods in one study","pmids":["30540250"],"is_preprint":false},{"year":2019,"finding":"Cross-linking mass spectrometry (XL-MS) combined with integrated modeling identified intermolecular interfaces of R7BP with RGS7/Gβ5, enabling development of antibody inhibitors of the R7BP–RGS7/Gβ5 interaction, validated by surface plasmon resonance and a dominant-negative R7BP construct.","method":"Cross-linking mass spectrometry, structural modeling, surface plasmon resonance, dominant-negative construct","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — XL-MS with SPR validation, single lab, identifies specific interaction interfaces","pmids":["31531399"],"is_preprint":false}],"current_model":"RGS7BP (R7BP) is a palmitoylated, neuronally expressed SNARE-like membrane anchor that forms obligate heterotrimeric complexes with R7-family RGS proteins (RGS6, RGS7, RGS9-2, RGS11) and Gβ5; palmitoylation of its C-terminal polybasic/cysteine motif targets these complexes to the plasma membrane and postsynaptic densities where they potently accelerate Gi/o GTPase activity to regulate GPCR–GIRK signaling, while depalmitoylation drives nuclear shuttling of the complex; R7BP additionally stabilizes its RGS partners by shielding them from lysosomal cysteine protease-mediated degradation, undergoes activity-dependent remodeling between RGS9-2 and RGS7 partners in response to calcium influx, and its GAP-facilitating function is required for normal hippocampal synaptic plasticity, striatal dopamine/opioid signaling, and itch sensation."},"narrative":{"mechanistic_narrative":"RGS7BP (R7BP) is a neuronally expressed, palmitoylated membrane anchor that organizes the subcellular localization, stability, and signaling output of R7-family RGS protein complexes that accelerate Gi/o GTPase activity at GPCRs [PMID:15632198, PMID:15897264]. It forms tight complexes with all four R7 RGS proteins (RGS6, RGS7, RGS9, RGS11) and Gβ5, binding through an interface formed by the RGS DEP and R7H domains contacting the R7BP core [PMID:15632198, PMID:17158100], with crystallography and cross-linking mass spectrometry resolving the synergistic intermolecular interfaces of the RGS7–Gβ5–R7BP heterotrimer and its allosteric conformational coupling [PMID:30540250, PMID:31531399]. C-terminal palmitoylation, acting together with an adjacent polybasic motif, targets these complexes to the plasma membrane and postsynaptic density, and only the membrane-bound, palmitoylated form efficiently augments RGS-mediated attenuation of GPCR–GIRK channel signaling; depalmitoylation exposes nuclear localization sequences and drives nuclear/cytoplasmic shuttling of the complex [PMID:15897264, PMID:16867977, PMID:16574655]. Beyond localization, R7BP stabilizes its RGS partners post-translationally by shielding RGS9-2 degradation determinants from lysosomal cysteine proteases [PMID:17158100, PMID:18094251], and the complex undergoes activity-dependent remodeling in which calcium entry uncouples RGS9-2 (triggering its degradation) and frees R7BP to recruit RGS7 to the membrane [PMID:19332565]. Functionally, R7BP sets the dynamic range and kinetics of GABAB receptor–GIRK responses in hippocampal and cerebellar neurons [PMID:24755289, PMID:27965545], shapes striatal dopamine/opioid behaviors [PMID:20043004], and is required for normal itch sensation acting upstream of kappa-opioid receptor signaling [PMID:28134655].","teleology":[{"year":2005,"claim":"Established that R7BP is a dedicated binding partner for the entire R7 RGS subfamily, defining the molecular basis of complex assembly via the RGS DEP domain.","evidence":"Reciprocal Co-IP from striatal brain extracts plus in vitro binding with recombinant proteins","pmids":["15632198"],"confidence":"High","gaps":["Did not resolve which residues of the R7BP core mediate binding","Functional consequence of complex formation not yet tested"]},{"year":2005,"claim":"Showed that palmitoylation controls membrane targeting and signaling potency, answering how R7BP enhances RGS-mediated GPCR regulation and revealing a depalmitoylation-driven nuclear shuttling switch.","evidence":"Live-cell imaging, palmitoylation assays, and GIRK channel electrophysiology","pmids":["15897264"],"confidence":"High","gaps":["Enzymes catalyzing palmitoylation/depalmitoylation not identified","Physiological trigger for depalmitoylation unknown at this stage"]},{"year":2006,"claim":"Defined the C-terminal polybasic motif and palmitoylated cysteines as the bipartite signal whose synergy dictates plasma membrane versus nuclear localization and the necessity of membrane localization for signaling.","evidence":"Site-directed mutagenesis with localization and GIRK signaling assays in striatal neurons","pmids":["16867977","16574655"],"confidence":"High","gaps":["Structural basis of polybasic motif recognition unresolved","Nuclear function of the shuttled complex undefined"]},{"year":2006,"claim":"Revealed that R7BP is not only a localizer but a stabilizer, controlling RGS9-2 abundance by protecting it from proteolysis, and mapped the DEP/R7H–core binding interface.","evidence":"Co-expression degradation kinetics, lentiviral RNAi in native striatal neurons, domain mapping","pmids":["17158100"],"confidence":"High","gaps":["Identity of the degradation pathway not yet pinpointed at this stage","Whether stabilization applies equally to other R7 partners untested"]},{"year":2007,"claim":"Identified the lysosomal cysteine protease pathway as the route of RGS9-2 turnover shielded by R7BP and placed the complex at the postsynaptic density in vivo during development.","evidence":"In vivo biochemistry, protease inhibitor studies, immunoelectron microscopy, developmental profiling","pmids":["18094251"],"confidence":"High","gaps":["Specific protease(s) not molecularly identified","Mechanism coupling synaptic demand to complex accumulation unclear"]},{"year":2007,"claim":"Demonstrated compartment- and tissue-specific anchor usage, distinguishing R7BP-associated R7 complexes in retinal synapses from R9AP-associated complexes in photoreceptors.","evidence":"Co-IP, immunolocalization, and knockout mouse analysis in retina; recruitment and IHC in brain and Neuro2A cells","pmids":["17442586","18248908"],"confidence":"Medium","gaps":["Determinants selecting R7BP versus R9AP not defined","Single-lab localization findings without orthogonal confirmation"]},{"year":2008,"claim":"Showed that RGS7/Gβ5 targeting to retinal ON-bipolar dendritic tips is R7BP-independent, establishing that not all R7 complex localization requires this anchor.","evidence":"Immunolocalization in R7BP knockout mice","pmids":["18842904"],"confidence":"Medium","gaps":["Alternative targeting adapter for this complex unidentified","Single readout per conclusion"]},{"year":2009,"claim":"Uncovered activity-dependent partner remodeling, showing calcium influx uncouples RGS9-2 from R7BP and redirects R7BP to RGS7, linking neuronal activity to RGS complex composition.","evidence":"Co-IP and fractionation from striatal tissue under defined stimulation conditions","pmids":["19332565"],"confidence":"Medium","gaps":["Molecular sensor coupling calcium to uncoupling unknown","Single-lab biochemistry without in vivo validation"]},{"year":2009,"claim":"Quantified R7BP binding preferences among purified partners and identified a direct Gαoa–R7BP interaction, extending the interaction map beyond RGS/Gβ5.","evidence":"In vitro binding assays with purified recombinant proteins measuring dissociation constants","pmids":["19497306"],"confidence":"Medium","gaps":["Physiological relevance of direct Gαoa–R7BP binding untested in cells","Single in vitro study"]},{"year":2009,"claim":"Established physiological consequences in striatum, showing R7BP-dependent balance of RGS9-2 and RGS7 governs motor coordination and drug-evoked locomotor behaviors.","evidence":"Knockout mouse behavior and striatum-specific lentiviral knockdown with biochemical quantification","pmids":["20043004"],"confidence":"Medium","gaps":["Circuit-level signaling changes not directly recorded","Receptor partners driving each behavior not fully resolved"]},{"year":2014,"claim":"Demonstrated that R7BP sets the dynamic range and kinetics of GABAB receptor–GIRK signaling in hippocampal neurons, defining its role in synaptic inhibition.","evidence":"Electrophysiology in R7BP knockout hippocampal pyramidal neurons","pmids":["24755289"],"confidence":"High","gaps":["Contribution to behavioral plasticity not directly tested here","Whether other GPCRs share this regulation unaddressed"]},{"year":2016,"claim":"Confirmed R7BP-dependent membrane targeting of RGS7/Gβ5 at cerebellar Purkinje cell synapses, generalizing its anchoring role across brain regions.","evidence":"Co-IP, immunohistochemistry, and electron microscopy in R7BP knockout mice","pmids":["27965545"],"confidence":"Medium","gaps":["Functional signaling consequence in cerebellum not measured","Pre- versus postsynaptic functional roles undistinguished"]},{"year":2017,"claim":"Placed R7BP-dependent GAP activity in a sensory pathway, showing it is required for itch and acts upstream of kappa-opioid receptor-mediated itch inhibition.","evidence":"Knockout mouse behavioral assays with R7BP/Oprk1 double-knockout epistasis and pharmacological challenge","pmids":["28134655"],"confidence":"High","gaps":["Cell type and circuit mediating itch effect not defined","Which R7 RGS partner mediates the effect not specified"]},{"year":2018,"claim":"Resolved the atomic architecture of the RGS7–Gβ5–R7BP complex, revealing synergistic interfaces and long-range allosteric coupling among subunits.","evidence":"X-ray crystallography with molecular dynamics and mass spectrometry","pmids":["30540250"],"confidence":"High","gaps":["Structure of the palmitoylated, membrane-bound state not captured","Conformational basis of GAP enhancement not directly visualized"]},{"year":2019,"claim":"Mapped the R7BP–RGS7/Gβ5 interaction interfaces and produced antibody and dominant-negative tools to inhibit the complex, enabling targeted disruption.","evidence":"Cross-linking mass spectrometry, integrated modeling, surface plasmon resonance, dominant-negative construct","pmids":["31531399"],"confidence":"Medium","gaps":["In vivo efficacy of inhibitors not demonstrated","Specificity across R7 family members not fully resolved"]},{"year":null,"claim":"How activity-dependent palmitoylation/depalmitoylation cycling and partner remodeling are enzymatically controlled, and what the depalmitoylated nuclear complex does, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["Palmitoyl acyltransferase/thioesterase for R7BP unidentified","Function of nuclear R7BP–R7–Gβ5 complex unknown","Calcium sensor driving RGS9-2/RGS7 switching uncharacterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1,3,12]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,2,3,5]},{"term_id":"GO:0140313","term_label":"molecular sequestering activity","supporting_discovery_ids":[3,5]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,2,4,7,13]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,2,4]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,2,12]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[12,13,14]}],"complexes":["RGS7–Gβ5–R7BP heterotrimer","RGS9-2–Gβ5–R7BP complex"],"partners":["RGS9","RGS7","RGS6","RGS11","GNB5","GNAO1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q6MZT1","full_name":"Regulator of G-protein signaling 7-binding protein","aliases":["R7 family-binding protein"],"length_aa":257,"mass_kda":29.0,"function":"Regulator of G protein-coupled receptor (GPCR) signaling. Regulatory subunit of the R7-Gbeta5 complexes that acts by controlling the subcellular location of the R7-Gbeta5 complexes. When palmitoylated, it targets the R7-Gbeta5 complexes to the plasma membrane, leading to inhibit G protein alpha subunits. When it is unpalmitoylated, the R7-Gbeta5 complexes undergo a nuclear/cytoplasmic shuttling. May also act by controlling the proteolytic stability of R7 proteins, probably by protecting them from degradation","subcellular_location":"Nucleus; Cytoplasm; Cell membrane","url":"https://www.uniprot.org/uniprotkb/Q6MZT1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RGS7BP","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RGS7BP","total_profiled":1310},"omim":[{"mim_id":"610890","title":"REGULATOR OF G PROTEIN SIGNALING 7-BINDING PROTEIN; RGS7BP","url":"https://www.omim.org/entry/610890"},{"mim_id":"604447","title":"GUANINE NUCLEOTIDE-BINDING PROTEIN, BETA-5; GNB5","url":"https://www.omim.org/entry/604447"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Plasma membrane","reliability":"Uncertain"},{"location":"Cytosol","reliability":"Uncertain"},{"location":"Actin filaments","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"brain","ntpm":21.7}],"url":"https://www.proteinatlas.org/search/RGS7BP"},"hgnc":{"alias_symbol":["R7BP"],"prev_symbol":[]},"alphafold":{"accession":"Q6MZT1","domains":[{"cath_id":"1.20.58.70","chopping":"45-72_81-153_192-224","consensus_level":"high","plddt":91.7107,"start":45,"end":224}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6MZT1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q6MZT1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q6MZT1-F1-predicted_aligned_error_v6.png","plddt_mean":72.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RGS7BP","jax_strain_url":"https://www.jax.org/strain/search?query=RGS7BP"},"sequence":{"accession":"Q6MZT1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q6MZT1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q6MZT1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6MZT1"}},"corpus_meta":[{"pmid":"15632198","id":"PMC_15632198","title":"R7BP, a novel neuronal protein interacting with RGS proteins of the R7 family.","date":"2005","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15632198","citation_count":125,"is_preprint":false},{"pmid":"15897264","id":"PMC_15897264","title":"Palmitoylation regulates plasma membrane-nuclear shuttling of R7BP, a novel membrane anchor for the RGS7 family.","date":"2005","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/15897264","citation_count":114,"is_preprint":false},{"pmid":"24755289","id":"PMC_24755289","title":"RGS7/Gβ5/R7BP complex regulates synaptic plasticity and memory by modulating hippocampal GABABR-GIRK signaling.","date":"2014","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/24755289","citation_count":71,"is_preprint":false},{"pmid":"16867977","id":"PMC_16867977","title":"R7BP augments the function of RGS7*Gbeta5 complexes by a plasma membrane-targeting mechanism.","date":"2006","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16867977","citation_count":60,"is_preprint":false},{"pmid":"19042037","id":"PMC_19042037","title":"R9AP and R7BP: traffic cops for the RGS7 family in phototransduction and neuronal GPCR signaling.","date":"2008","source":"Trends in pharmacological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/19042037","citation_count":59,"is_preprint":false},{"pmid":"18094251","id":"PMC_18094251","title":"Expression and localization of RGS9-2/G 5/R7BP complex in vivo is set by dynamic control of its constitutive degradation by cellular cysteine proteases.","date":"2007","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/18094251","citation_count":55,"is_preprint":false},{"pmid":"17158100","id":"PMC_17158100","title":"The membrane anchor R7BP controls the proteolytic stability of the striatal specific RGS protein, RGS9-2.","date":"2006","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/17158100","citation_count":53,"is_preprint":false},{"pmid":"16574655","id":"PMC_16574655","title":"Subcellular targeting of RGS9-2 is controlled by multiple molecular determinants on its membrane anchor, R7BP.","date":"2006","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16574655","citation_count":53,"is_preprint":false},{"pmid":"18842904","id":"PMC_18842904","title":"Targeting of RGS7/Gbeta5 to the dendritic tips of ON-bipolar cells is independent of its association with membrane anchor R7BP.","date":"2008","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/18842904","citation_count":43,"is_preprint":false},{"pmid":"20043004","id":"PMC_20043004","title":"R7BP complexes with RGS9-2 and RGS7 in the striatum differentially control motor learning and locomotor responses to 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containing Gbeta5 and R7BP subunits.","date":"2009","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/19332565","citation_count":28,"is_preprint":false},{"pmid":"16046666","id":"PMC_16046666","title":"R7BP: a surprising new link between G proteins, RGS proteins, and nuclear signaling in the brain.","date":"2005","source":"Science's STKE : signal transduction knowledge environment","url":"https://pubmed.ncbi.nlm.nih.gov/16046666","citation_count":21,"is_preprint":false},{"pmid":"30540250","id":"PMC_30540250","title":"Structural organization of a major neuronal G protein regulator, the RGS7-Gβ5-R7BP complex.","date":"2018","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/30540250","citation_count":21,"is_preprint":false},{"pmid":"22089315","id":"PMC_22089315","title":"R7BP modulates opiate analgesia and tolerance but not withdrawal.","date":"2011","source":"Neuropsychopharmacology : official publication of the American College of 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family RGS proteins (RGS6, RGS7, RGS9, RGS11) in brain. Binding occurs via the N-terminal DEP domain of RGS9 interacting with R7BP. R7BP is related to the syntaxin subfamily of SNARE proteins.\",\n      \"method\": \"Co-immunoprecipitation from striatal brain extracts, in vitro binding assays with recombinant proteins\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP from native tissue plus in vitro reconstitution, replicated across all four R7 family members\",\n      \"pmids\": [\"15632198\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"R7BP is palmitoylated near its C-terminus, which targets it to the plasma membrane. Depalmitoylation of R7BP causes translocation of R7BP–R7–Gβ5 complexes from the plasma membrane to the nucleus. Palmitoylated R7BP greatly augments the ability of RGS7 to attenuate GPCR-mediated GIRK channel activation compared with nonpalmitoylated R7BP.\",\n      \"method\": \"Live-cell imaging, subcellular fractionation, palmitoylation assays, electrophysiology (GIRK channel assay)\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (localization, biochemical, functional electrophysiology) in one study, replicated by subsequent work\",\n      \"pmids\": [\"15897264\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"R7BP augments the function of RGS7·Gβ5 complexes specifically by a palmitoylation-dependent plasma membrane-targeting mechanism. Unpalmitoylated R7BP undergoes nuclear/cytoplasmic shuttling. A C-terminal polybasic motif proximal to the palmitoylation acceptor sites mediates nuclear localization, palmitoylation, and plasma membrane targeting. Cytoplasmic RGS7·Gβ5·R7BP heterotrimers and RGS7·Gβ5 heterodimers are equivalently inefficient at regulating GPCR signaling relative to plasma membrane-bound heterotrimers with palmitoylated R7BP.\",\n      \"method\": \"Site-directed mutagenesis, subcellular localization assays, GPCR signaling/GIRK electrophysiology\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — mutagenesis of palmitoylation/polybasic motif combined with functional signaling assay, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"16867977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"R7BP controls proteolytic stability of RGS9-2: co-expression with R7BP dramatically elevates levels of RGS9-2 and Gβ5 by reducing their rate of proteolysis. The binding site for R7BP in RGS proteins is formed by pairing of the DEP domain with the R7H domain, which interacts with four putative alpha-helices of the R7BP core. RNAi knockdown of R7BP in native striatal neurons decreases RGS9-2 protein levels.\",\n      \"method\": \"Co-expression studies, degradation kinetics measurement, lentiviral RNAi knockdown in striatal neurons, domain mapping\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (overexpression, knockdown in native neurons, domain mutagenesis) in single study with clear mechanistic outcome\",\n      \"pmids\": [\"17158100\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The C-terminal 21 amino acids of R7BP are necessary and sufficient for plasma membrane and postsynaptic density targeting of RGS9-2·Gβ5·R7BP complexes. This requires synergistic contributions of two elements: a polybasic motif and palmitoylated cysteines. Two functional nuclear localization sequences in R7BP mediate nuclear import upon depalmitoylation.\",\n      \"method\": \"Site-directed mutagenesis, subcellular fractionation, immunolocalization in differentiated striatal neurons\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis combined with localization in native neurons, single lab, multiple constructs tested\",\n      \"pmids\": [\"16574655\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"R7BP binding shields RGS9-2 degradation determinants from lysosomal cysteine proteases, controlling RGS9-2 expression at the posttranslational level in vivo. Additionally, R7BP targets RGS9-2 to the postsynaptic density in neurons, and this complex accumulates postsynaptically during ontogenetic development in concert with increased synaptic signaling demands.\",\n      \"method\": \"In vivo biochemical analysis, protease inhibitor studies, immunoelectron microscopy, developmental expression profiling\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mechanistic dissection of protease pathway combined with localization at postsynaptic density in vivo, replicated across developmental time points\",\n      \"pmids\": [\"18094251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In the retina, R7BP forms complexes predominantly with R7 RGS proteins localized to synaptic projections of retinal neurons (as opposed to R9AP which associates with RGS9/RGS11 in photoreceptors), suggesting differential membrane anchor usage for distinct subcellular compartments.\",\n      \"method\": \"Co-immunoprecipitation, immunolocalization, knockout mouse analysis\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and localization in knockout mice, single lab, two complementary methods\",\n      \"pmids\": [\"17442586\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"R7BP and Gβ5 protein levels are upregulated during the first 2–3 weeks of postnatal brain development. In Neuro2A cells, R7BP at brain-level expression recruits endogenous RGS7–Gβ5 complexes to the plasma membrane. R7BP immunoreactivity concentrates in neuronal soma, dendrites, and spines, but is absent or low in glia, myelinated axons, and axon terminals. R7-Gβ5-R7BP complexes associate inefficiently with detergent-resistant lipid raft fractions.\",\n      \"method\": \"Co-immunoprecipitation, cell transfection with subcellular localization assay, immunohistochemistry, detergent-resistant membrane fractionation\",\n      \"journal\": \"Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — multiple localization and biochemical methods, single lab\",\n      \"pmids\": [\"18248908\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Targeting of RGS7/Gβ5 to the dendritic tips of ON-bipolar cells in the retina occurs independently of its association with R7BP, demonstrating an adapter-independent targeting mechanism for this specific RGS/Gβ5 complex.\",\n      \"method\": \"In vivo examination in R7BP knockout mice, immunolocalization\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockout mouse combined with localization, single lab, single method per conclusion\",\n      \"pmids\": [\"18842904\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Under normal conditions in striatum, R7BP is predominantly associated with RGS9-2 rather than RGS7. Changes in neuronal excitability or oxygenation causing extracellular calcium entry selectively uncouple RGS9-2 from R7BP, triggering RGS9-2 degradation, while released R7BP then binds RGS7 and recruits it from intracellular pools to the plasma membrane and postsynaptic density — an activity-dependent remodeling mechanism.\",\n      \"method\": \"Co-immunoprecipitation from striatal tissue under different stimulation conditions, subcellular fractionation, immunolocalization\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and fractionation under defined stimulation conditions in native tissue, single lab\",\n      \"pmids\": [\"19332565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"R7BP complexes with both RGS9-2 and RGS7 in the striatum. R7BP knockout mice show motor coordination deficits and enhanced locomotor response to morphine (consistent with reduced RGS9-2 levels). Striatum-specific knockdown shows cocaine locomotor sensitization depends on RGS7 whose R7BP complex formation is dictated by RGS9-2 expression, revealing concerted interplay between RGS9-2 and RGS7 balanced by shared R7BP.\",\n      \"method\": \"Knockout mouse behavioral analysis, striatum-specific lentiviral RNAi knockdown, biochemical quantification\",\n      \"journal\": \"Neuropsychopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO and targeted knockdown with defined behavioral and molecular readouts, single lab\",\n      \"pmids\": [\"20043004\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Gβ5-free recombinant RGS11 binds R7BP with higher affinity (Kd ~308 nM) than Gαoa (Kd ~904 nM), indicating a binding preference for R7BP. A novel direct interaction between Gαoa and R7BP was also identified (Kd ~592 nM).\",\n      \"method\": \"In vitro binding assay with purified recombinant proteins, equilibrium dissociation constant measurement\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro reconstitution with purified proteins measuring binding affinities, single lab, single study\",\n      \"pmids\": [\"19497306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RGS7, in cooperation with R7BP, regulates GABABR-GIRK signaling in hippocampal pyramidal neurons. R7BP sets the dynamic range of GIRK responses by serving as the membrane-anchoring subunit for RGS7. Deletion of R7BP alters the magnitude and kinetics of GIRK channel responses to GABAB receptor stimulation.\",\n      \"method\": \"Knockout mouse electrophysiology, GIRK channel recording in hippocampal pyramidal neurons\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — electrophysiology in defined genetic knockout combined with circuit-level analysis, replicated across multiple measures\",\n      \"pmids\": [\"24755289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In cerebellar cortex, RGS7/Gβ5/R7BP complexes are co-immunoprecipitable and localized to postsynaptic and presynaptic sites on Purkinje cell dendrites/spines, enriched around excitatory synapses. Deletion of R7BP in mice reduces targeting of both RGS7 and Gβ5 to the plasma membrane in the cerebellar cortex.\",\n      \"method\": \"Co-immunoprecipitation, immunohistochemistry, electron microscopy, R7BP knockout mouse analysis\",\n      \"journal\": \"Frontiers in neuroanatomy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP combined with electron microscopy localization in KO mice, single lab\",\n      \"pmids\": [\"27965545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"R7BP knockout mice show diminished scratching responses to multiple pruritogens (cutaneous and intrathecal), demonstrating R7BP is required for normal itch sensation. The pruriceptive defect was rescued by additional knockout of Oprk1 (kappa-opioid receptor), placing R7BP-dependent GAP activity upstream of kappa-opioid receptor-mediated itch inhibition in the pathway.\",\n      \"method\": \"Knockout mouse behavioral assays, double knockout (R7BP/Oprk1) epistasis, pharmacological challenge with kappa opioid agonists\",\n      \"journal\": \"Pain\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis (double KO rescue) combined with multiple behavioral paradigms and pharmacological rescue, establishing pathway position\",\n      \"pmids\": [\"28134655\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Crystal structure of the RGS7–Gβ5–R7BP complex reveals unique organizational features including long-range conformational changes imposed by constituent subunits during allosteric modulation, with multiple intermolecular interfaces working in synergy.\",\n      \"method\": \"X-ray crystallography, molecular dynamics simulation, mass spectrometry\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with molecular dynamics and MS, multiple orthogonal structural methods in one study\",\n      \"pmids\": [\"30540250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Cross-linking mass spectrometry (XL-MS) combined with integrated modeling identified intermolecular interfaces of R7BP with RGS7/Gβ5, enabling development of antibody inhibitors of the R7BP–RGS7/Gβ5 interaction, validated by surface plasmon resonance and a dominant-negative R7BP construct.\",\n      \"method\": \"Cross-linking mass spectrometry, structural modeling, surface plasmon resonance, dominant-negative construct\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — XL-MS with SPR validation, single lab, identifies specific interaction interfaces\",\n      \"pmids\": [\"31531399\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RGS7BP (R7BP) is a palmitoylated, neuronally expressed SNARE-like membrane anchor that forms obligate heterotrimeric complexes with R7-family RGS proteins (RGS6, RGS7, RGS9-2, RGS11) and Gβ5; palmitoylation of its C-terminal polybasic/cysteine motif targets these complexes to the plasma membrane and postsynaptic densities where they potently accelerate Gi/o GTPase activity to regulate GPCR–GIRK signaling, while depalmitoylation drives nuclear shuttling of the complex; R7BP additionally stabilizes its RGS partners by shielding them from lysosomal cysteine protease-mediated degradation, undergoes activity-dependent remodeling between RGS9-2 and RGS7 partners in response to calcium influx, and its GAP-facilitating function is required for normal hippocampal synaptic plasticity, striatal dopamine/opioid signaling, and itch sensation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RGS7BP (R7BP) is a neuronally expressed, palmitoylated membrane anchor that organizes the subcellular localization, stability, and signaling output of R7-family RGS protein complexes that accelerate Gi/o GTPase activity at GPCRs [#0, #1]. It forms tight complexes with all four R7 RGS proteins (RGS6, RGS7, RGS9, RGS11) and G\\u03b25, binding through an interface formed by the RGS DEP and R7H domains contacting the R7BP core [#0, #3], with crystallography and cross-linking mass spectrometry resolving the synergistic intermolecular interfaces of the RGS7\\u2013G\\u03b25\\u2013R7BP heterotrimer and its allosteric conformational coupling [#15, #16]. C-terminal palmitoylation, acting together with an adjacent polybasic motif, targets these complexes to the plasma membrane and postsynaptic density, and only the membrane-bound, palmitoylated form efficiently augments RGS-mediated attenuation of GPCR\\u2013GIRK channel signaling; depalmitoylation exposes nuclear localization sequences and drives nuclear/cytoplasmic shuttling of the complex [#1, #2, #4]. Beyond localization, R7BP stabilizes its RGS partners post-translationally by shielding RGS9-2 degradation determinants from lysosomal cysteine proteases [#3, #5], and the complex undergoes activity-dependent remodeling in which calcium entry uncouples RGS9-2 (triggering its degradation) and frees R7BP to recruit RGS7 to the membrane [#9]. Functionally, R7BP sets the dynamic range and kinetics of GABAB receptor\\u2013GIRK responses in hippocampal and cerebellar neurons [#12, #13], shapes striatal dopamine/opioid behaviors [#10], and is required for normal itch sensation acting upstream of kappa-opioid receptor signaling [#14].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Established that R7BP is a dedicated binding partner for the entire R7 RGS subfamily, defining the molecular basis of complex assembly via the RGS DEP domain.\",\n      \"evidence\": \"Reciprocal Co-IP from striatal brain extracts plus in vitro binding with recombinant proteins\",\n      \"pmids\": [\"15632198\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve which residues of the R7BP core mediate binding\", \"Functional consequence of complex formation not yet tested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Showed that palmitoylation controls membrane targeting and signaling potency, answering how R7BP enhances RGS-mediated GPCR regulation and revealing a depalmitoylation-driven nuclear shuttling switch.\",\n      \"evidence\": \"Live-cell imaging, palmitoylation assays, and GIRK channel electrophysiology\",\n      \"pmids\": [\"15897264\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Enzymes catalyzing palmitoylation/depalmitoylation not identified\", \"Physiological trigger for depalmitoylation unknown at this stage\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined the C-terminal polybasic motif and palmitoylated cysteines as the bipartite signal whose synergy dictates plasma membrane versus nuclear localization and the necessity of membrane localization for signaling.\",\n      \"evidence\": \"Site-directed mutagenesis with localization and GIRK signaling assays in striatal neurons\",\n      \"pmids\": [\"16867977\", \"16574655\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of polybasic motif recognition unresolved\", \"Nuclear function of the shuttled complex undefined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Revealed that R7BP is not only a localizer but a stabilizer, controlling RGS9-2 abundance by protecting it from proteolysis, and mapped the DEP/R7H\\u2013core binding interface.\",\n      \"evidence\": \"Co-expression degradation kinetics, lentiviral RNAi in native striatal neurons, domain mapping\",\n      \"pmids\": [\"17158100\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the degradation pathway not yet pinpointed at this stage\", \"Whether stabilization applies equally to other R7 partners untested\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identified the lysosomal cysteine protease pathway as the route of RGS9-2 turnover shielded by R7BP and placed the complex at the postsynaptic density in vivo during development.\",\n      \"evidence\": \"In vivo biochemistry, protease inhibitor studies, immunoelectron microscopy, developmental profiling\",\n      \"pmids\": [\"18094251\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific protease(s) not molecularly identified\", \"Mechanism coupling synaptic demand to complex accumulation unclear\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstrated compartment- and tissue-specific anchor usage, distinguishing R7BP-associated R7 complexes in retinal synapses from R9AP-associated complexes in photoreceptors.\",\n      \"evidence\": \"Co-IP, immunolocalization, and knockout mouse analysis in retina; recruitment and IHC in brain and Neuro2A cells\",\n      \"pmids\": [\"17442586\", \"18248908\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Determinants selecting R7BP versus R9AP not defined\", \"Single-lab localization findings without orthogonal confirmation\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed that RGS7/G\\u03b25 targeting to retinal ON-bipolar dendritic tips is R7BP-independent, establishing that not all R7 complex localization requires this anchor.\",\n      \"evidence\": \"Immunolocalization in R7BP knockout mice\",\n      \"pmids\": [\"18842904\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Alternative targeting adapter for this complex unidentified\", \"Single readout per conclusion\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Uncovered activity-dependent partner remodeling, showing calcium influx uncouples RGS9-2 from R7BP and redirects R7BP to RGS7, linking neuronal activity to RGS complex composition.\",\n      \"evidence\": \"Co-IP and fractionation from striatal tissue under defined stimulation conditions\",\n      \"pmids\": [\"19332565\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular sensor coupling calcium to uncoupling unknown\", \"Single-lab biochemistry without in vivo validation\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Quantified R7BP binding preferences among purified partners and identified a direct G\\u03b1oa\\u2013R7BP interaction, extending the interaction map beyond RGS/G\\u03b25.\",\n      \"evidence\": \"In vitro binding assays with purified recombinant proteins measuring dissociation constants\",\n      \"pmids\": [\"19497306\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological relevance of direct G\\u03b1oa\\u2013R7BP binding untested in cells\", \"Single in vitro study\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Established physiological consequences in striatum, showing R7BP-dependent balance of RGS9-2 and RGS7 governs motor coordination and drug-evoked locomotor behaviors.\",\n      \"evidence\": \"Knockout mouse behavior and striatum-specific lentiviral knockdown with biochemical quantification\",\n      \"pmids\": [\"20043004\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Circuit-level signaling changes not directly recorded\", \"Receptor partners driving each behavior not fully resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated that R7BP sets the dynamic range and kinetics of GABAB receptor\\u2013GIRK signaling in hippocampal neurons, defining its role in synaptic inhibition.\",\n      \"evidence\": \"Electrophysiology in R7BP knockout hippocampal pyramidal neurons\",\n      \"pmids\": [\"24755289\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Contribution to behavioral plasticity not directly tested here\", \"Whether other GPCRs share this regulation unaddressed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Confirmed R7BP-dependent membrane targeting of RGS7/G\\u03b25 at cerebellar Purkinje cell synapses, generalizing its anchoring role across brain regions.\",\n      \"evidence\": \"Co-IP, immunohistochemistry, and electron microscopy in R7BP knockout mice\",\n      \"pmids\": [\"27965545\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional signaling consequence in cerebellum not measured\", \"Pre- versus postsynaptic functional roles undistinguished\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Placed R7BP-dependent GAP activity in a sensory pathway, showing it is required for itch and acts upstream of kappa-opioid receptor-mediated itch inhibition.\",\n      \"evidence\": \"Knockout mouse behavioral assays with R7BP/Oprk1 double-knockout epistasis and pharmacological challenge\",\n      \"pmids\": [\"28134655\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell type and circuit mediating itch effect not defined\", \"Which R7 RGS partner mediates the effect not specified\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Resolved the atomic architecture of the RGS7\\u2013G\\u03b25\\u2013R7BP complex, revealing synergistic interfaces and long-range allosteric coupling among subunits.\",\n      \"evidence\": \"X-ray crystallography with molecular dynamics and mass spectrometry\",\n      \"pmids\": [\"30540250\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of the palmitoylated, membrane-bound state not captured\", \"Conformational basis of GAP enhancement not directly visualized\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Mapped the R7BP\\u2013RGS7/G\\u03b25 interaction interfaces and produced antibody and dominant-negative tools to inhibit the complex, enabling targeted disruption.\",\n      \"evidence\": \"Cross-linking mass spectrometry, integrated modeling, surface plasmon resonance, dominant-negative construct\",\n      \"pmids\": [\"31531399\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo efficacy of inhibitors not demonstrated\", \"Specificity across R7 family members not fully resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How activity-dependent palmitoylation/depalmitoylation cycling and partner remodeling are enzymatically controlled, and what the depalmitoylated nuclear complex does, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Palmitoyl acyltransferase/thioesterase for R7BP unidentified\", \"Function of nuclear R7BP\\u2013R7\\u2013G\\u03b25 complex unknown\", \"Calcium sensor driving RGS9-2/RGS7 switching uncharacterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 3, 12]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 2, 3, 5]},\n      {\"term_id\": \"GO:0140313\", \"supporting_discovery_ids\": [3, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 2, 4, 7, 13]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 2, 4]},\n      {\"term_id\": \"GO:0014069\", \"supporting_discovery_ids\": [4, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 2, 12]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [12, 13, 14]}\n    ],\n    \"complexes\": [\n      \"RGS7\\u2013G\\u03b25\\u2013R7BP heterotrimer\",\n      \"RGS9-2\\u2013G\\u03b25\\u2013R7BP complex\"\n    ],\n    \"partners\": [\n      \"RGS9\",\n      \"RGS7\",\n      \"RGS6\",\n      \"RGS11\",\n      \"GNB5\",\n      \"GNAO1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}