{"gene":"RIMS2","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":2001,"finding":"The cAMP-GEFII (Epac2)–Rim2 complex mediates cAMP-dependent, PKA-independent exocytosis in pancreatic beta-cells; antisense knockdown of cAMP-GEFII combined with PKA inhibition inhibited incretin-potentiated insulin secretion ~80–90%, establishing that Rim2 acts downstream of cAMP-GEFII in a PKA-independent pathway for incretin-potentiated insulin secretion.","method":"Antisense oligodeoxynucleotide knockdown in pancreatic islets; pharmacological PKA inhibition (H-89); insulin secretion assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal loss-of-function approaches (antisense + PKA inhibitor) in native beta-cells, single lab","pmids":["11598134"],"is_preprint":false},{"year":2002,"finding":"Piccolo forms Ca2+-dependent homodimers and heterodimers with Rim2, and acts as a Ca2+ sensor in the cAMP-GEFII·Rim2·Piccolo complex required for cAMP-induced insulin secretion in pancreatic beta-cells; antisense knockdown of Piccolo inhibited cAMP analog-induced insulin secretion.","method":"Co-immunoprecipitation, pulldown assays for dimerization; antisense oligodeoxynucleotide knockdown of Piccolo in pancreatic islets; insulin secretion assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal binding assays plus functional knockdown in native cells, single lab","pmids":["12401793"],"is_preprint":false},{"year":2003,"finding":"Rim2 interacts specifically with Rab3A/B/C/D and Rab8A (but not Rab27A/B), and an acidic cluster (Glu-50, Glu-51, Glu-52) in the α1 region of the Rab-binding domain of Rim2 is a critical determinant of Rab3A recognition, as shown by site-directed mutagenesis and chimeric analyses.","method":"Cotransfection binding assay with 42 Rab proteins; site-directed mutagenesis; chimeric protein analyses","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — systematic mutagenesis and chimeric analyses across 42 Rab proteins, multiple orthogonal methods in one study","pmids":["12578829"],"is_preprint":false},{"year":2005,"finding":"Crystal structure of the RIM2 C2A-domain at 1.4 Å resolution reveals a β-sandwich with a unique dipolar electrostatic charge distribution; the domain does not bind Ca2+, and NMR experiments showed little binding to SNAP-25 or synaptotagmin 1 C2-domains, suggesting unidentified Ca2+-independent interactions via the bottom face.","method":"X-ray crystallography (1.4 Å); NMR spectroscopy; biochemical binding assays","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus NMR with functional binding characterization, multiple orthogonal methods","pmids":["16216076"],"is_preprint":false},{"year":2005,"finding":"Alternative splicing in the Rab-binding domain (RBD1) of Rim2 controls Rab3A-binding affinity: short-form RBD binds Rab3A with high affinity and is recruited to dense-core vesicles (DCVs) in PC12 cells, while long-form RBD has >50-fold reduced Rab3A affinity and localizes to cytoplasm/nucleus. Expression of the short form, but not a Rab3A-binding-defective mutant (E36A/R37S), promotes high-KCl-dependent neuropeptide Y secretion.","method":"In vitro Rab3A binding assay; fluorescence localization in PC12 cells; neuropeptide Y secretion assay; site-directed mutagenesis (E36A/R37S)","journal":"Methods in enzymology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro binding, cell localization, and functional secretion assay with mutagenesis, single lab","pmids":["16473611"],"is_preprint":false},{"year":2009,"finding":"TBEV-NS5 binds to the RIMS2 PDZ domain via an internal PDZ-binding mechanism, and this interaction stabilizes targeting of TBEV-NS5 to the plasma membrane.","method":"Protein–protein interaction assay; co-localization imaging; PDZ binding characterization","journal":"Biological chemistry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single binding/co-localization approach, no functional mutagenesis of RIMS2 itself","pmids":["19199833"],"is_preprint":false},{"year":2011,"finding":"GLP-1 enhances glucokinase (GK) activity in beta-cells via a cAMP-dependent, PKA-independent pathway requiring Epac2, Rim2, and Rab3A; siRNA silencing of any of these three proteins blocked GLP-1-induced enhancement of GK activity and downstream glucose sensing.","method":"siRNA silencing of Epac2, Rim2, Rab3A; glucokinase activity assay; glucose uptake, mitochondrial membrane potential, and ATP measurements in INS-1 cells and native beta-cells","journal":"Endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple knockdowns with functional biochemical readouts, single lab","pmids":["22147008"],"is_preprint":false},{"year":2012,"finding":"In zebrafish photoreceptors, RIM2 localizes inside the horseshoe-shaped synaptic ribbon structure (interior relative to RIBEYE); RIBEYE knockdown reduces ribbon number/length and causes corresponding reduction in RIM2 expression and loss of clustered CaV1.4 localization.","method":"STED super-resolution microscopy; morpholino antisense RIBEYE knockdown; electroretinogram","journal":"Microscopy and microanalysis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — super-resolution localization plus genetic knockdown with functional consequence, single lab","pmids":["22832038"],"is_preprint":false},{"year":2014,"finding":"At the calyx of Held synapse, RIM1 and RIM2 are redundantly required for normal presynaptic Ca2+ channel density and readily releasable pool (RRP) size; conditional RIM2 single KO caused a subtle reduction in presynaptic Ca2+ current density, while RIM1 single KO was ineffective, but only the RIM1/2 double KO strongly reduced both Ca2+ channel density and RRP.","method":"Conditional genetic knockout (RIM1, RIM2, RIM1/2 double); direct presynaptic patch-clamp electrophysiology at calyx of Held; quantitative PCR","journal":"Journal of neurophysiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with direct presynaptic electrophysiology, single and double KO genetic epistasis, replicated phenotypically","pmids":["25343783"],"is_preprint":false},{"year":2020,"finding":"Synaptic ribbons are required to stabilize Cav1.4/RIM2 clusters at rod photoreceptor active zones and are needed for darkness-induced enrichment of Cav1.4/RIM2 at active zones; RIBEYE KO mice showed loss of both ribbon integrity and Cav1.4/RIM2 cluster size.","method":"RIBEYE knockout mouse analysis; quantitative immunofluorescence imaging of Cav1.4/RIM2 clusters; ribbon length correlation analysis","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with direct protein localization quantification, single lab","pmids":["32249787"],"is_preprint":false},{"year":2020,"finding":"Biallelic loss-of-function RIMS2 variants cause a syndromic congenital cone-rod synaptic disorder; RIMS2 protein is localized to the human retinal outer plexiform layer, Purkinje cells, and pancreatic islets; nonsense RIMS2 variants produce truncated protein and decrease insulin secretion in mammalian cells.","method":"Whole-exome sequencing; immunostaining for subcellular localization; expression of truncated variants in mammalian cells; insulin secretion assay","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct immunolocalization plus cell-based functional assay with truncating variants, single lab","pmids":["32470375"],"is_preprint":false},{"year":2024,"finding":"RBM5 knockout in the mouse brain alters RIMS2 protein homeostasis: male KOs show decreased canonical RIMS2 levels in cerebellum and hippocampus, and an increased novel ~170 kDa RIMS2 variant in hippocampus, suggesting RBM5 regulates RIMS2 splicing/expression in the brain.","method":"Conditional gene knockout (RBM5 KO); immunoprecipitation; western blot","journal":"Experimental neurology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, western blot and IP only, indirect regulation of RIMS2 by another protein, limited mechanistic follow-up","pmids":["38218585"],"is_preprint":false},{"year":2025,"finding":"Pathogenic LRRK2 increases phosphorylation of RAB3 proteins, reducing their interactions with RIM2 (and RIM1) effector proteins, thereby disrupting release sites in vulnerable dopamine axons and impairing dopamine release in vivo.","method":"Proximity labeling proteomics; immunofluorescence; in vivo dopamine release measurement; biochemical phosphorylation assays","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — preprint, single lab, indirect evidence for RIM2 interaction disruption via RAB3 phosphorylation","pmids":["bio_10.1101_2025.08.28.672006"],"is_preprint":true}],"current_model":"RIMS2 is a large active-zone scaffolding protein that functions as a Rab3A effector (via an N-terminal Rab-binding domain whose alternative splicing controls Rab3A affinity) and as a PDZ-domain scaffold; it forms a ternary complex with Epac2/cAMP-GEFII and Piccolo to mediate cAMP-dependent, PKA-independent exocytosis in pancreatic beta-cells, redundantly cooperates with RIM1 to cluster presynaptic Cav2 Ca2+ channels and maintain the readily releasable pool at central synapses, and is anchored at photoreceptor ribbon-type active zones through a synaptic ribbon-dependent mechanism that stabilizes Cav1.4 clustering; its C2A domain adopts a β-sandwich fold without Ca2+-binding capacity and likely acts through Ca2+-independent protein interactions."},"narrative":{"mechanistic_narrative":"RIMS2 (Rim2) is a multidomain active-zone scaffolding protein that couples small-GTPase signaling to regulated exocytosis at both neuronal and endocrine release sites [PMID:12578829, PMID:25343783]. Through an N-terminal Rab-binding domain it acts as a Rab3A effector, recognizing Rab3A/B/C/D and Rab8A via an acidic cluster (Glu-50/51/52) in its α1 region, and alternative splicing of this domain tunes Rab3A affinity—the short-form binds Rab3A with high affinity and is recruited to dense-core vesicles to support stimulated secretion, while the low-affinity long form does not [PMID:12578829, PMID:16473611]. In pancreatic beta-cells RIMS2 functions in a ternary complex with Epac2/cAMP-GEFII and the Ca2+-sensing scaffold Piccolo to mediate cAMP-dependent, PKA-independent insulin secretion, and the same Epac2–Rim2–Rab3A module is required for GLP-1 potentiation of glucokinase activity and glucose sensing [PMID:11598134, PMID:12401793, PMID:22147008]. At central synapses RIMS2 acts redundantly with RIM1 to maintain presynaptic Ca2+ channel density and the readily releasable pool, with double knockout but not single knockout producing strong deficits [PMID:25343783]. At photoreceptor ribbon synapses RIMS2 localizes interior to the RIBEYE-containing ribbon, and ribbon integrity is required to stabilize and enrich Cav1.4/RIM2 clusters at the active zone [PMID:22832038, PMID:32249787]. Its C2A domain adopts a β-sandwich fold that does not bind Ca2+ and shows little binding to SNAP-25 or synaptotagmin-1, indicating it acts through Ca2+-independent protein interactions [PMID:16216076]. Biallelic loss-of-function RIMS2 variants cause a syndromic congenital cone-rod synaptic disorder, consistent with its localization to the retinal outer plexiform layer, Purkinje cells, and pancreatic islets [PMID:32470375].","teleology":[{"year":2001,"claim":"Established that Rim2 operates downstream of cAMP-GEFII (Epac2) in a PKA-independent branch of incretin-potentiated insulin secretion, placing the protein in a defined cAMP signaling pathway rather than as a generic scaffold.","evidence":"Antisense knockdown plus PKA inhibition with insulin secretion assays in pancreatic islets","pmids":["11598134"],"confidence":"Medium","gaps":["Does not define the direct molecular interactions linking Epac2 to Rim2","Does not resolve which exocytic step Rim2 controls"]},{"year":2002,"claim":"Identified Piccolo as a Ca2+-sensing partner that dimerizes with Rim2 within the Epac2·Rim2·Piccolo complex, supplying the Ca2+-dependence of cAMP-induced insulin secretion.","evidence":"Co-IP and pulldown dimerization assays plus antisense Piccolo knockdown in islets","pmids":["12401793"],"confidence":"Medium","gaps":["Stoichiometry and architecture of the ternary complex not resolved","Single-lab functional knockdown"]},{"year":2003,"claim":"Defined the molecular basis of Rim2 as a Rab3A/Rab8A effector by mapping an acidic-cluster determinant in the Rab-binding domain, distinguishing its Rab selectivity from Rab27.","evidence":"Cotransfection binding screen across 42 Rab proteins with site-directed mutagenesis and chimeras","pmids":["12578829"],"confidence":"High","gaps":["Functional consequence of Rab8A binding not characterized","Binding measured in cotransfection rather than reconstituted system"]},{"year":2005,"claim":"Showed that the C2A domain, despite a canonical β-sandwich fold, lacks Ca2+-binding and weak binding to SNAP-25/synaptotagmin-1, redefining it as a Ca2+-independent protein-interaction module.","evidence":"1.4 Å X-ray crystallography, NMR, and biochemical binding assays","pmids":["16216076"],"confidence":"High","gaps":["The Ca2+-independent binding partner engaging the bottom face is unidentified","No in-cell validation of the proposed interaction surface"]},{"year":2005,"claim":"Demonstrated that alternative splicing of the Rab-binding domain is a regulatory switch controlling Rab3A affinity, vesicle recruitment, and secretory competence.","evidence":"In vitro Rab3A binding, PC12 localization, NPY secretion, and E36A/R37S mutagenesis","pmids":["16473611"],"confidence":"Medium","gaps":["Physiological regulation of splice-form choice not addressed","Single cell model"]},{"year":2011,"claim":"Extended the Epac2–Rim2–Rab3A module to metabolic sensing by showing it is required for GLP-1 enhancement of glucokinase activity and downstream glucose handling.","evidence":"siRNA silencing of Epac2/Rim2/Rab3A with glucokinase, glucose uptake, and ATP assays in INS-1 and native beta-cells","pmids":["22147008"],"confidence":"Medium","gaps":["Mechanistic link between Rim2 and glucokinase regulation unresolved","Single lab"]},{"year":2014,"claim":"Resolved the functional relationship between RIM1 and RIM2 at a central synapse, showing they redundantly set presynaptic Ca2+ channel density and readily releasable pool size.","evidence":"Conditional single and double knockouts with direct presynaptic patch-clamp at the calyx of Held","pmids":["25343783"],"confidence":"High","gaps":["Does not isolate RIM2-specific molecular targets","Channel-clustering mechanism not directly visualized"]},{"year":2020,"claim":"Linked RIM2 to ribbon-synapse organization by showing the synaptic ribbon is required to stabilize and enrich Cav1.4/RIM2 clusters at photoreceptor active zones.","evidence":"STED imaging, RIBEYE morpholino/knockout in zebrafish and mouse with cluster quantification","pmids":["22832038","32249787"],"confidence":"Medium","gaps":["Whether RIM2 directly tethers Cav1.4 versus depends on ribbon scaffold is unresolved","Mechanism of darkness-induced enrichment unknown"]},{"year":2020,"claim":"Established RIMS2 as a human disease gene, with biallelic loss-of-function causing a syndromic cone-rod synaptic disorder and impaired insulin secretion, tying its retinal and endocrine roles to pathology.","evidence":"Whole-exome sequencing, immunolocalization, and truncating-variant expression with insulin secretion assays","pmids":["32470375"],"confidence":"Medium","gaps":["Genotype-phenotype correlations across tissues not fully defined","Cerebellar Purkinje-cell function of RIMS2 not assayed"]},{"year":null,"claim":"The identity of the Ca2+-independent C2A binding partner, the regulation of RIM2 splicing in vivo, and how Rab3 phosphorylation gates RIM2 recruitment at disease-vulnerable synapses remain open.","evidence":"No direct experimental resolution in the available corpus","pmids":[],"confidence":"Low","gaps":["C2A-domain interacting protein unidentified","In vivo control of RBM5-dependent RIMS2 splicing not mechanistically established","LRRK2/Rab3-phosphorylation effect on RIM2 reported only in preprint"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1,2,4]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,4,8]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[7,9,10]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4]}],"complexes":["Epac2·Rim2·Piccolo complex","presynaptic active zone","photoreceptor synaptic ribbon active zone"],"partners":["RAB3A","RAB8A","PCLO","RAPGEF4","CACNA1F","RIMS1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9UQ26","full_name":"Regulating synaptic membrane exocytosis protein 2","aliases":["Rab-3-interacting molecule 2","RIM 2","Rab-3-interacting protein 3"],"length_aa":1411,"mass_kda":160.4,"function":"Rab effector involved in exocytosis. May act as scaffold protein. Plays a role in dendrite formation by melanocytes (PubMed:23999003)","subcellular_location":"Cell membrane; Synapse; Presynaptic cell membrane","url":"https://www.uniprot.org/uniprotkb/Q9UQ26/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RIMS2","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RIMS2","total_profiled":1310},"omim":[{"mim_id":"618970","title":"CONE-ROD SYNAPTIC DISORDER SYNDROME, CONGENITAL NONPROGRESSIVE; CRSDS","url":"https://www.omim.org/entry/618970"},{"mim_id":"611602","title":"RIMS-BINDING PROTEIN 2; RIMBP2","url":"https://www.omim.org/entry/611602"},{"mim_id":"611600","title":"PROTEIN REGULATING SYNAPTIC MEMBRANE EXOCYTOSIS 3; RIMS3","url":"https://www.omim.org/entry/611600"},{"mim_id":"610764","title":"TSPO-ASSOCIATED PROTEIN 1; TSPOAP1","url":"https://www.omim.org/entry/610764"},{"mim_id":"610427","title":"CONE-ROD SYNAPTIC DISORDER, CONGENITAL NONPROGRESSIVE; CRSD","url":"https://www.omim.org/entry/610427"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"adrenal gland","ntpm":45.5},{"tissue":"brain","ntpm":41.6},{"tissue":"retina","ntpm":72.6}],"url":"https://www.proteinatlas.org/search/RIMS2"},"hgnc":{"alias_symbol":["KIAA0751","RIM2","OBOE"],"prev_symbol":["RAB3IP3"]},"alphafold":{"accession":"Q9UQ26","domains":[{"cath_id":"3.30.60.120","chopping":"121-178","consensus_level":"medium","plddt":83.9271,"start":121,"end":178},{"cath_id":"2.30.42.10","chopping":"647-667_674-756","consensus_level":"high","plddt":83.63,"start":647,"end":756},{"cath_id":"2.60.40.150","chopping":"807-938","consensus_level":"high","plddt":89.0684,"start":807,"end":938},{"cath_id":"2.60.40.150","chopping":"1240-1389","consensus_level":"high","plddt":89.4809,"start":1240,"end":1389}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UQ26","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UQ26-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UQ26-F1-predicted_aligned_error_v6.png","plddt_mean":54.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RIMS2","jax_strain_url":"https://www.jax.org/strain/search?query=RIMS2"},"sequence":{"accession":"Q9UQ26","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UQ26.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UQ26/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UQ26"}},"corpus_meta":[{"pmid":"11598134","id":"PMC_11598134","title":"Critical role of cAMP-GEFII--Rim2 complex in incretin-potentiated insulin secretion.","date":"2001","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11598134","citation_count":290,"is_preprint":false},{"pmid":"12401793","id":"PMC_12401793","title":"Piccolo, a Ca2+ sensor in pancreatic beta-cells. Involvement of cAMP-GEFII.Rim2. Piccolo complex in cAMP-dependent exocytosis.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12401793","citation_count":167,"is_preprint":false},{"pmid":"12578829","id":"PMC_12578829","title":"Distinct Rab binding specificity of Rim1, Rim2, rabphilin, and Noc2. Identification of a critical determinant of Rab3A/Rab27A recognition by Rim2.","date":"2003","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12578829","citation_count":159,"is_preprint":false},{"pmid":"22147008","id":"PMC_22147008","title":"Glucagon-like peptide-1 enhances glucokinase activity in pancreatic β-cells through the association of Epac2 with Rim2 and Rab3A.","date":"2011","source":"Endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/22147008","citation_count":43,"is_preprint":false},{"pmid":"21777202","id":"PMC_21777202","title":"Rim2, a pyrimidine nucleotide exchanger, is needed for iron utilization in mitochondria.","date":"2011","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/21777202","citation_count":38,"is_preprint":false},{"pmid":"25343783","id":"PMC_25343783","title":"RIM1 and RIM2 redundantly determine Ca2+ channel density and readily releasable pool size at a large hindbrain 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and Hippocampus and exacerbates behavioral deficits after a TBI in mice.","date":"2024","source":"Experimental neurology","url":"https://pubmed.ncbi.nlm.nih.gov/38218585","citation_count":2,"is_preprint":false},{"pmid":"40819013","id":"PMC_40819013","title":"Genetic Heterogeneity of Autism Spectrum Disorder: Identification of Five Novel Mutations (RIMS2, FOXG1, AUTS2, ZCCHC17, and SPTBN5) in Iranian Families via Whole-Exome and Whole-Genome Sequencing.","date":"2025","source":"Biochemical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/40819013","citation_count":1,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.08.28.672006","title":"Leucine-rich repeat kinase 2 impairs the release sites of Parkinson’s disease vulnerable dopamine axons","date":"2025-08-28","source":"bioRxiv","url":"https://doi.org/10.1101/2025.08.28.672006","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.09.18.24313851","title":"Associations between RetNet gene polymorphisms and efficacy of orthokeratology for myopia control : sample from a clinical retrospective study","date":"2024-09-19","source":"bioRxiv","url":"https://doi.org/10.1101/2024.09.18.24313851","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":14388,"output_tokens":3247,"usd":0.045935,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10780,"output_tokens":3338,"usd":0.068675,"stage2_stop_reason":"end_turn"},"total_usd":0.11461,"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\": 2001,\n      \"finding\": \"The cAMP-GEFII (Epac2)–Rim2 complex mediates cAMP-dependent, PKA-independent exocytosis in pancreatic beta-cells; antisense knockdown of cAMP-GEFII combined with PKA inhibition inhibited incretin-potentiated insulin secretion ~80–90%, establishing that Rim2 acts downstream of cAMP-GEFII in a PKA-independent pathway for incretin-potentiated insulin secretion.\",\n      \"method\": \"Antisense oligodeoxynucleotide knockdown in pancreatic islets; pharmacological PKA inhibition (H-89); insulin secretion assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal loss-of-function approaches (antisense + PKA inhibitor) in native beta-cells, single lab\",\n      \"pmids\": [\"11598134\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Piccolo forms Ca2+-dependent homodimers and heterodimers with Rim2, and acts as a Ca2+ sensor in the cAMP-GEFII·Rim2·Piccolo complex required for cAMP-induced insulin secretion in pancreatic beta-cells; antisense knockdown of Piccolo inhibited cAMP analog-induced insulin secretion.\",\n      \"method\": \"Co-immunoprecipitation, pulldown assays for dimerization; antisense oligodeoxynucleotide knockdown of Piccolo in pancreatic islets; insulin secretion assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal binding assays plus functional knockdown in native cells, single lab\",\n      \"pmids\": [\"12401793\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Rim2 interacts specifically with Rab3A/B/C/D and Rab8A (but not Rab27A/B), and an acidic cluster (Glu-50, Glu-51, Glu-52) in the α1 region of the Rab-binding domain of Rim2 is a critical determinant of Rab3A recognition, as shown by site-directed mutagenesis and chimeric analyses.\",\n      \"method\": \"Cotransfection binding assay with 42 Rab proteins; site-directed mutagenesis; chimeric protein analyses\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — systematic mutagenesis and chimeric analyses across 42 Rab proteins, multiple orthogonal methods in one study\",\n      \"pmids\": [\"12578829\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Crystal structure of the RIM2 C2A-domain at 1.4 Å resolution reveals a β-sandwich with a unique dipolar electrostatic charge distribution; the domain does not bind Ca2+, and NMR experiments showed little binding to SNAP-25 or synaptotagmin 1 C2-domains, suggesting unidentified Ca2+-independent interactions via the bottom face.\",\n      \"method\": \"X-ray crystallography (1.4 Å); NMR spectroscopy; biochemical binding assays\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus NMR with functional binding characterization, multiple orthogonal methods\",\n      \"pmids\": [\"16216076\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Alternative splicing in the Rab-binding domain (RBD1) of Rim2 controls Rab3A-binding affinity: short-form RBD binds Rab3A with high affinity and is recruited to dense-core vesicles (DCVs) in PC12 cells, while long-form RBD has >50-fold reduced Rab3A affinity and localizes to cytoplasm/nucleus. Expression of the short form, but not a Rab3A-binding-defective mutant (E36A/R37S), promotes high-KCl-dependent neuropeptide Y secretion.\",\n      \"method\": \"In vitro Rab3A binding assay; fluorescence localization in PC12 cells; neuropeptide Y secretion assay; site-directed mutagenesis (E36A/R37S)\",\n      \"journal\": \"Methods in enzymology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro binding, cell localization, and functional secretion assay with mutagenesis, single lab\",\n      \"pmids\": [\"16473611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TBEV-NS5 binds to the RIMS2 PDZ domain via an internal PDZ-binding mechanism, and this interaction stabilizes targeting of TBEV-NS5 to the plasma membrane.\",\n      \"method\": \"Protein–protein interaction assay; co-localization imaging; PDZ binding characterization\",\n      \"journal\": \"Biological chemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single binding/co-localization approach, no functional mutagenesis of RIMS2 itself\",\n      \"pmids\": [\"19199833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"GLP-1 enhances glucokinase (GK) activity in beta-cells via a cAMP-dependent, PKA-independent pathway requiring Epac2, Rim2, and Rab3A; siRNA silencing of any of these three proteins blocked GLP-1-induced enhancement of GK activity and downstream glucose sensing.\",\n      \"method\": \"siRNA silencing of Epac2, Rim2, Rab3A; glucokinase activity assay; glucose uptake, mitochondrial membrane potential, and ATP measurements in INS-1 cells and native beta-cells\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple knockdowns with functional biochemical readouts, single lab\",\n      \"pmids\": [\"22147008\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In zebrafish photoreceptors, RIM2 localizes inside the horseshoe-shaped synaptic ribbon structure (interior relative to RIBEYE); RIBEYE knockdown reduces ribbon number/length and causes corresponding reduction in RIM2 expression and loss of clustered CaV1.4 localization.\",\n      \"method\": \"STED super-resolution microscopy; morpholino antisense RIBEYE knockdown; electroretinogram\",\n      \"journal\": \"Microscopy and microanalysis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — super-resolution localization plus genetic knockdown with functional consequence, single lab\",\n      \"pmids\": [\"22832038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"At the calyx of Held synapse, RIM1 and RIM2 are redundantly required for normal presynaptic Ca2+ channel density and readily releasable pool (RRP) size; conditional RIM2 single KO caused a subtle reduction in presynaptic Ca2+ current density, while RIM1 single KO was ineffective, but only the RIM1/2 double KO strongly reduced both Ca2+ channel density and RRP.\",\n      \"method\": \"Conditional genetic knockout (RIM1, RIM2, RIM1/2 double); direct presynaptic patch-clamp electrophysiology at calyx of Held; quantitative PCR\",\n      \"journal\": \"Journal of neurophysiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with direct presynaptic electrophysiology, single and double KO genetic epistasis, replicated phenotypically\",\n      \"pmids\": [\"25343783\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Synaptic ribbons are required to stabilize Cav1.4/RIM2 clusters at rod photoreceptor active zones and are needed for darkness-induced enrichment of Cav1.4/RIM2 at active zones; RIBEYE KO mice showed loss of both ribbon integrity and Cav1.4/RIM2 cluster size.\",\n      \"method\": \"RIBEYE knockout mouse analysis; quantitative immunofluorescence imaging of Cav1.4/RIM2 clusters; ribbon length correlation analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with direct protein localization quantification, single lab\",\n      \"pmids\": [\"32249787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Biallelic loss-of-function RIMS2 variants cause a syndromic congenital cone-rod synaptic disorder; RIMS2 protein is localized to the human retinal outer plexiform layer, Purkinje cells, and pancreatic islets; nonsense RIMS2 variants produce truncated protein and decrease insulin secretion in mammalian cells.\",\n      \"method\": \"Whole-exome sequencing; immunostaining for subcellular localization; expression of truncated variants in mammalian cells; insulin secretion assay\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct immunolocalization plus cell-based functional assay with truncating variants, single lab\",\n      \"pmids\": [\"32470375\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RBM5 knockout in the mouse brain alters RIMS2 protein homeostasis: male KOs show decreased canonical RIMS2 levels in cerebellum and hippocampus, and an increased novel ~170 kDa RIMS2 variant in hippocampus, suggesting RBM5 regulates RIMS2 splicing/expression in the brain.\",\n      \"method\": \"Conditional gene knockout (RBM5 KO); immunoprecipitation; western blot\",\n      \"journal\": \"Experimental neurology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, western blot and IP only, indirect regulation of RIMS2 by another protein, limited mechanistic follow-up\",\n      \"pmids\": [\"38218585\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Pathogenic LRRK2 increases phosphorylation of RAB3 proteins, reducing their interactions with RIM2 (and RIM1) effector proteins, thereby disrupting release sites in vulnerable dopamine axons and impairing dopamine release in vivo.\",\n      \"method\": \"Proximity labeling proteomics; immunofluorescence; in vivo dopamine release measurement; biochemical phosphorylation assays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — preprint, single lab, indirect evidence for RIM2 interaction disruption via RAB3 phosphorylation\",\n      \"pmids\": [\"bio_10.1101_2025.08.28.672006\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"RIMS2 is a large active-zone scaffolding protein that functions as a Rab3A effector (via an N-terminal Rab-binding domain whose alternative splicing controls Rab3A affinity) and as a PDZ-domain scaffold; it forms a ternary complex with Epac2/cAMP-GEFII and Piccolo to mediate cAMP-dependent, PKA-independent exocytosis in pancreatic beta-cells, redundantly cooperates with RIM1 to cluster presynaptic Cav2 Ca2+ channels and maintain the readily releasable pool at central synapses, and is anchored at photoreceptor ribbon-type active zones through a synaptic ribbon-dependent mechanism that stabilizes Cav1.4 clustering; its C2A domain adopts a β-sandwich fold without Ca2+-binding capacity and likely acts through Ca2+-independent protein interactions.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RIMS2 (Rim2) is a multidomain active-zone scaffolding protein that couples small-GTPase signaling to regulated exocytosis at both neuronal and endocrine release sites [#2, #8]. Through an N-terminal Rab-binding domain it acts as a Rab3A effector, recognizing Rab3A/B/C/D and Rab8A via an acidic cluster (Glu-50/51/52) in its \\u03b11 region, and alternative splicing of this domain tunes Rab3A affinity\\u2014the short-form binds Rab3A with high affinity and is recruited to dense-core vesicles to support stimulated secretion, while the low-affinity long form does not [#2, #4]. In pancreatic beta-cells RIMS2 functions in a ternary complex with Epac2/cAMP-GEFII and the Ca2+-sensing scaffold Piccolo to mediate cAMP-dependent, PKA-independent insulin secretion, and the same Epac2\\u2013Rim2\\u2013Rab3A module is required for GLP-1 potentiation of glucokinase activity and glucose sensing [#0, #1, #6]. At central synapses RIMS2 acts redundantly with RIM1 to maintain presynaptic Ca2+ channel density and the readily releasable pool, with double knockout but not single knockout producing strong deficits [#8]. At photoreceptor ribbon synapses RIMS2 localizes interior to the RIBEYE-containing ribbon, and ribbon integrity is required to stabilize and enrich Cav1.4/RIM2 clusters at the active zone [#7, #9]. Its C2A domain adopts a \\u03b2-sandwich fold that does not bind Ca2+ and shows little binding to SNAP-25 or synaptotagmin-1, indicating it acts through Ca2+-independent protein interactions [#3]. Biallelic loss-of-function RIMS2 variants cause a syndromic congenital cone-rod synaptic disorder, consistent with its localization to the retinal outer plexiform layer, Purkinje cells, and pancreatic islets [#10].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established that Rim2 operates downstream of cAMP-GEFII (Epac2) in a PKA-independent branch of incretin-potentiated insulin secretion, placing the protein in a defined cAMP signaling pathway rather than as a generic scaffold.\",\n      \"evidence\": \"Antisense knockdown plus PKA inhibition with insulin secretion assays in pancreatic islets\",\n      \"pmids\": [\"11598134\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not define the direct molecular interactions linking Epac2 to Rim2\", \"Does not resolve which exocytic step Rim2 controls\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identified Piccolo as a Ca2+-sensing partner that dimerizes with Rim2 within the Epac2\\u00b7Rim2\\u00b7Piccolo complex, supplying the Ca2+-dependence of cAMP-induced insulin secretion.\",\n      \"evidence\": \"Co-IP and pulldown dimerization assays plus antisense Piccolo knockdown in islets\",\n      \"pmids\": [\"12401793\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Stoichiometry and architecture of the ternary complex not resolved\", \"Single-lab functional knockdown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defined the molecular basis of Rim2 as a Rab3A/Rab8A effector by mapping an acidic-cluster determinant in the Rab-binding domain, distinguishing its Rab selectivity from Rab27.\",\n      \"evidence\": \"Cotransfection binding screen across 42 Rab proteins with site-directed mutagenesis and chimeras\",\n      \"pmids\": [\"12578829\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of Rab8A binding not characterized\", \"Binding measured in cotransfection rather than reconstituted system\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Showed that the C2A domain, despite a canonical \\u03b2-sandwich fold, lacks Ca2+-binding and weak binding to SNAP-25/synaptotagmin-1, redefining it as a Ca2+-independent protein-interaction module.\",\n      \"evidence\": \"1.4 \\u00c5 X-ray crystallography, NMR, and biochemical binding assays\",\n      \"pmids\": [\"16216076\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The Ca2+-independent binding partner engaging the bottom face is unidentified\", \"No in-cell validation of the proposed interaction surface\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrated that alternative splicing of the Rab-binding domain is a regulatory switch controlling Rab3A affinity, vesicle recruitment, and secretory competence.\",\n      \"evidence\": \"In vitro Rab3A binding, PC12 localization, NPY secretion, and E36A/R37S mutagenesis\",\n      \"pmids\": [\"16473611\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological regulation of splice-form choice not addressed\", \"Single cell model\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Extended the Epac2\\u2013Rim2\\u2013Rab3A module to metabolic sensing by showing it is required for GLP-1 enhancement of glucokinase activity and downstream glucose handling.\",\n      \"evidence\": \"siRNA silencing of Epac2/Rim2/Rab3A with glucokinase, glucose uptake, and ATP assays in INS-1 and native beta-cells\",\n      \"pmids\": [\"22147008\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic link between Rim2 and glucokinase regulation unresolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Resolved the functional relationship between RIM1 and RIM2 at a central synapse, showing they redundantly set presynaptic Ca2+ channel density and readily releasable pool size.\",\n      \"evidence\": \"Conditional single and double knockouts with direct presynaptic patch-clamp at the calyx of Held\",\n      \"pmids\": [\"25343783\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not isolate RIM2-specific molecular targets\", \"Channel-clustering mechanism not directly visualized\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Linked RIM2 to ribbon-synapse organization by showing the synaptic ribbon is required to stabilize and enrich Cav1.4/RIM2 clusters at photoreceptor active zones.\",\n      \"evidence\": \"STED imaging, RIBEYE morpholino/knockout in zebrafish and mouse with cluster quantification\",\n      \"pmids\": [\"22832038\", \"32249787\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether RIM2 directly tethers Cav1.4 versus depends on ribbon scaffold is unresolved\", \"Mechanism of darkness-induced enrichment unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established RIMS2 as a human disease gene, with biallelic loss-of-function causing a syndromic cone-rod synaptic disorder and impaired insulin secretion, tying its retinal and endocrine roles to pathology.\",\n      \"evidence\": \"Whole-exome sequencing, immunolocalization, and truncating-variant expression with insulin secretion assays\",\n      \"pmids\": [\"32470375\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Genotype-phenotype correlations across tissues not fully defined\", \"Cerebellar Purkinje-cell function of RIMS2 not assayed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The identity of the Ca2+-independent C2A binding partner, the regulation of RIM2 splicing in vivo, and how Rab3 phosphorylation gates RIM2 recruitment at disease-vulnerable synapses remain open.\",\n      \"evidence\": \"No direct experimental resolution in the available corpus\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"C2A-domain interacting protein unidentified\", \"In vivo control of RBM5-dependent RIMS2 splicing not mechanistically established\", \"LRRK2/Rab3-phosphorylation effect on RIM2 reported only in preprint\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 2, 4]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 4, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [7, 9, 10]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"complexes\": [\"Epac2\\u00b7Rim2\\u00b7Piccolo complex\", \"presynaptic active zone\", \"photoreceptor synaptic ribbon active zone\"],\n    \"partners\": [\"RAB3A\", \"RAB8A\", \"PCLO\", \"RAPGEF4\", \"CACNA1F\", \"RIMS1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}