{"gene":"RIMS1","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":2001,"finding":"RIM1 and Munc13-1 interact functionally at the presynaptic active zone; disruption of this interaction causes loss of fusion-competent synaptic vesicles, phenocopying Munc13-1-deficient neurons. RIM1 binding and vesicle priming are mediated by two distinct structural modules of Munc13-1.","method":"Biochemical interaction assays, electrophysiology in neurons, loss-of-function genetic analysis","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal functional and biochemical interaction, multiple orthogonal methods (binding assay + electrophysiology + genetic phenocopy), replicated in subsequent work","pmids":["11343654"],"is_preprint":false},{"year":2001,"finding":"RIM1 binds Rab3-GTP (but not GDP-saturated Rab3) via a short N-terminal alpha-helical sequence (amino acids 19–55); a point mutation R33G abolishes binding. Rab3 isoforms A, C, D are bound with similar affinities (Kd=1–2 µM). The zinc finger domain of Rim1 binds Munc13 but not Rab3.","method":"Surface plasmon resonance with recombinant bacterially expressed proteins, pull-down from brain lysate, site-directed mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with SPR kinetics, mutagenesis validation, pull-down confirmation","pmids":["11431472"],"is_preprint":false},{"year":2001,"finding":"The Rab3a-GTP binding domain and the secretion-enhancing domain of RIM1 are distinct and separable: a ~30 amino acid sequence immediately N-terminal to the zinc finger constitutes the minimal Rab3a-GTP binding domain, while the zinc finger domain alone enhances secretion without binding Rab3a. N-terminal RIM1 increases the rate of ATP-dependent priming of secretion without altering Ca2+ sensitivity.","method":"Domain deletion/truncation analysis, secretion assays in intact and permeabilized adrenal chromaffin cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro functional reconstitution with defined domain truncations and exocytosis readout, multiple constructs tested","pmids":["11278839"],"is_preprint":false},{"year":2002,"finding":"CAST (CAZ-associated structural protein) directly binds RIM1 and indirectly binds Munc13-1 through RIM1, forming a ternary complex at the cytomatrix of the active zone. Bassoon is also associated with this ternary complex. CAST, RIM1, and Bassoon are co-transported on the same vesicles during synapse formation.","method":"Co-immunoprecipitation, direct binding assay, immunoisolation of vesicles with antibody-coupled beads, immunolocalization","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple Co-IP and direct binding assays, immunoisolation, replicated in subsequent work (PMID 14734538)","pmids":["12163476"],"is_preprint":false},{"year":2003,"finding":"RIM1 interacts with Rab3A/B/C/D, Rab10, Rab26, and Rab37 but not Rab27A/B or Rab8A; alternative splicing of the first alpha-helical region of the RIM1 Rab binding domain alters Rab binding specificity.","method":"Cotransfection binding assay with 42 different Rab proteins, site-directed mutagenesis, chimeric protein analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — systematic cotransfection binding screen with mutagenesis and chimeric analysis, multiple orthogonal approaches","pmids":["12578829"],"is_preprint":false},{"year":2004,"finding":"RIM1 and Bassoon directly bind to distinct regions of CAST (C-terminus and central region, respectively), forming a ternary complex. All known CAZ proteins (CAST, RIM1, Munc13-1, Bassoon, Piccolo) form a large molecular complex in brain. Microinjection of RIM1-binding or Bassoon-binding regions of CAST, or the CAST-binding domain of RIM1 or Bassoon, impairs synaptic transmission in cultured neurons.","method":"Direct binding assay, co-immunoprecipitation, microinjection of dominant-negative peptides, electrophysiology","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding assays combined with dominant-negative functional perturbation and electrophysiology, multiple orthogonal methods","pmids":["14734538"],"is_preprint":false},{"year":2007,"finding":"SCRAPPER, a synapse-localized E3 ubiquitin ligase, directly binds and ubiquitinates RIM1, targeting it for proteasome-mediated degradation. In Scrapper-knockout neurons, RIM1 has a longer half-life and reduced ubiquitination. RIM1 degradation by SCRAPPER is required for synaptic tuning: SCR-KO mice show increased miniature EPSC frequency (phenocopied by RIM1 overexpression and rescued by SCRAPPER re-expression or RIM1 knockdown).","method":"Co-immunoprecipitation, ubiquitination assay, knockout mouse electrophysiology, rescue experiments with re-expression and RNAi","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding shown by Co-IP, ubiquitination assay, KO mouse with specific electrophysiological phenotype, bidirectional rescue experiments","pmids":["17803915"],"is_preprint":false},{"year":2008,"finding":"The RIM1 gene encodes two isoforms from distinct promoters: RIM1α (with an N-terminal Rab3-binding sequence) and RIM1β (lacking that N-terminal sequence). RIM1β is upregulated in RIM1α knockout mice. Deletion of both isoforms severely impairs mouse survival and abolishes presynaptic long-term plasticity, while the RIM1α-only deletion impairment in synaptic strength and short-term plasticity is aggravated by double deletion.","method":"Conditional and constitutive knockout mouse generation, electrophysiology, molecular characterization of isoforms","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with defined electrophysiological phenotypes, isoform-specific molecular characterization, double vs single KO comparison","pmids":["19074017"],"is_preprint":false},{"year":2011,"finding":"RIM1 interacts with the CaVβ auxiliary subunit of L-type Ca2+ channels (CaV1.2 and CaV1.3) via co-immunoprecipitation. RIM1 decreases the rate of inactivation of L-type CaV channel currents in a CaVβ-dependent manner. Knockdown of endogenous RIM1 increases current inactivation and notably impairs high K+-stimulated insulin secretion in pancreatic β-cells.","method":"Co-immunoprecipitation, whole-cell patch clamp, siRNA knockdown, ELISA for insulin secretion","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP identifying CaVβ as binding partner, functional electrophysiology and secretion assay with knockdown, multiple orthogonal methods","pmids":["21402706"],"is_preprint":false},{"year":2011,"finding":"RIM1 promotes deinhibition of CaV2.2 channels from G-protein-mediated inhibition: Rim1-expressing cells show considerably greater extent of current deinhibition following channel activation upon μ-opioid receptor stimulation, favoring sustained Ca2+ influx under prolonged activity.","method":"Whole-cell patch clamp in HEK-293 cells co-expressing CaV2.2 and μ-opioid receptor with or without Rim1","journal":"Pflugers Archiv : European journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — single lab, heterologous expression system, single electrophysiological method","pmids":["21331761"],"is_preprint":false},{"year":2013,"finding":"Liprin-α2 is required for recruitment of RIM1 (and CASK) to presynaptic active zones. Depletion of liprin-α2 reduces turnover of RIM1 at presynaptic terminals as measured by FRAP, suggesting liprin-α2 promotes dynamic scaffolding of RIM1. Liprin-α2 controls synaptic vesicle pool size and synaptic output.","method":"Fluorescence recovery after photobleaching (FRAP), immunofluorescence, knockdown/overexpression in neurons, electron microscopy","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — FRAP for direct localization-function link, knockdown with defined phenotypic readouts, multiple methods in single lab","pmids":["23751498"],"is_preprint":false},{"year":2014,"finding":"RIM1 and RIM2 redundantly determine presynaptic Ca2+ channel density and readily releasable vesicle pool size at the calyx of Held synapse. Conditional double knockout of RIM1 and RIM2 strongly reduces presynaptic Ca2+ current density and RRP size, whereas single knockouts of each have only subtle or no effect.","method":"Conditional knockout mice, direct presynaptic whole-cell electrophysiology at calyx of Held, quantitative PCR","journal":"Journal of neurophysiology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — conditional genetic knockouts with direct presynaptic electrophysiology, single vs double KO comparison revealing redundancy","pmids":["25343783"],"is_preprint":false},{"year":2015,"finding":"RIM1/2 facilitate Ca2+ entry into rod photoreceptor terminals through Cav1.4 channels, which is required for Ca2+-stimulated vesicle release. Conditional double knockout of RIM1 and RIM2 from rods causes profound reduction in Ca2+ currents and ~4-fold reduction in spontaneous miniature release events and near-complete absence of evoked responses, without altering Cav1.4 protein expression or ribbon morphology.","method":"Conditional double knockout mice, whole-cell voltage-clamp recordings from rods, membrane capacitance measurements, immunofluorescence","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional genetic knockout with direct electrophysiological recording from photoreceptors, multiple readouts, separation of channel localization from functional regulation","pmids":["26400943"],"is_preprint":false},{"year":2007,"finding":"The CORD7-associated RIM1 R655H mutation (corresponding to human R844H) modifies RIM1's regulation of voltage-dependent Ca2+ channel currents elicited by P/Q-type CaV2.1 and L-type CaV1.4 channels, suggesting altered presynaptic VDCC regulation underlies the CORD7 phenotype.","method":"Electrophysiology in heterologous expression system with wild-type vs. mutant RIM1","journal":"Channels (Austin, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — single lab, heterologous expression system, single electrophysiological method comparing WT vs mutant","pmids":["18690027"],"is_preprint":false},{"year":2018,"finding":"RIM1 localizes postsynaptically in hippocampal CA1 neurons and facilitates membrane delivery of recycling NMDARs via binding to Rab11 through its N-terminus. Knockdown of RIM1 impairs both constitutive and regulated NMDAR (but not AMPAR) trafficking and membrane insertion of Rab11-positive recycling endosomes. Postsynaptic RIM1 is required for basal NMDAR-mediated synaptic responses and hippocampus-dependent memory.","method":"Immunofluorescence/fractionation for localization, Co-IP for Rab11 interaction, shRNA knockdown, electrophysiology, behavioral assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP identifying Rab11 as binding partner, knockdown with specific receptor-trafficking readout, electrophysiology, and behavioral phenotype, multiple orthogonal methods","pmids":["29891949"],"is_preprint":false},{"year":2022,"finding":"The CORD7 mutation (R844H/R915H in fly numbering) in the C2A domain of RIM1 exerts a semi-dominant effect on synaptic transmission, resulting in faster and more efficient synaptic release, increased size of the readily releasable pool, decreased sensitivity to the fast Ca2+ chelator BAPTA, and increased number of presynaptic active zones without perturbing their nanoscopic organization. Crystal structure of the Drosophila RIM C2A domain at 1.92 Å confirmed structural conservation of the mutation site.","method":"CRISPR/Cas9 genomic knock-in of CORD7 mutation in Drosophila, X-ray crystallography, two-electrode voltage clamp electrophysiology, focal recordings, super-resolution microscopy (STED) of Bruchpilot/ELKS/CAST","journal":"Brain : a journal of neurology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with CRISPR knock-in, multiple electrophysiological readouts, super-resolution imaging, mechanistic mutation analysis","pmids":["35022694"],"is_preprint":false},{"year":2003,"finding":"A G-to-A point mutation in the RIM1 (RIMS1) gene resulting in R844H substitution in the C2A domain was identified in CORD7 autosomal dominant cone-rod dystrophy. RIM1 is expressed in brain and in photoreceptors where it localizes to pre-synaptic ribbons in ribbon synapses. The RIM1 gene spans 577 kb, comprises at least 35 exons, and shows extensive alternative splicing.","method":"Mutation analysis by sequencing, segregation analysis, immunolocalization in retina/brain","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct sequencing for mutation identification, immunolocalization for subcellular position, but causal link to CORD7 later questioned (PMID 35947379)","pmids":["12659814"],"is_preprint":false},{"year":2024,"finding":"Crystal structure of the liprin-α2/RIM1 complex was determined, revealing multifaceted intermolecular interactions driving liprin-α/RIM assembly. Disrupting this interaction in neurons impairs synaptic transmission and reduces the readily releasable pool. Liprin-α promotes liquid-liquid phase separation (LLPS) of RIM1 at the active zone, and the liprin-α/RIM interaction modulates competitive distribution of ELKS1 and VGCCs in RIM1 condensates; disrupting it decreases VGCC accumulation and increases sensitivity to the slow Ca2+ buffer EGTA.","method":"X-ray crystallography, CRISPR/Cas9 knock-in mutations, electrophysiology, super-resolution imaging, EGTA sensitivity assay, in vitro phase separation assay","journal":"bioRxiv","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure combined with functional mutagenesis in neurons, electrophysiology, and phase separation assay; single lab preprint but multiple orthogonal rigorous methods","pmids":[],"is_preprint":true}],"current_model":"RIMS1/RIM1 is a multidomain presynaptic active zone scaffold protein that binds Rab3-GTP via its N-terminal alpha-helix (critical residue R33), interacts with Munc13-1 via its zinc finger domain to prime synaptic vesicles for fusion, forms a large CAZ complex with CAST, Bassoon, Piccolo, and ELKS/CAST, facilitates Ca2+ influx by slowing inactivation of voltage-gated Ca2+ channels (CaV2.1, CaV2.2, CaV1.4) through interaction with the CaVβ auxiliary subunit, recruits and clusters Ca2+ channels at active zones via liquid-liquid phase separation promoted by liprin-α2, is targeted for proteasome-mediated degradation by the E3 ubiquitin ligase SCRAPPER to tune synaptic release probability, and also localizes postsynaptically where it binds Rab11 to facilitate recycling endosome-mediated NMDAR membrane insertion; the CORD7-associated R844H mutation in its C2A domain enhances synaptic transmission by increasing active zone number, readily releasable pool size, and tightening Ca2+ coupling."},"narrative":{"mechanistic_narrative":"RIMS1/RIM1 is a multidomain presynaptic active zone scaffold that couples synaptic vesicle priming to Ca2+ channel positioning and exocytosis [PMID:11343654, PMID:14734538]. Through a short N-terminal alpha-helix it binds Rab3-GTP (and additional Rab isoforms, with binding abolished by the R33G mutation), while a separable adjacent zinc finger domain binds Munc13-1 to enhance the ATP-dependent priming of fusion-competent vesicles [PMID:11431472, PMID:11278839, PMID:12578829]. RIM1 nucleates the cytomatrix of the active zone by directly binding CAST and bridging it to Munc13-1 and Bassoon, together with Piccolo forming a large CAZ complex required for normal synaptic transmission [PMID:12163476, PMID:14734538]. It also organizes the presynaptic Ca2+ entry apparatus: RIM1 binds the CaVβ auxiliary subunit and slows inactivation of voltage-gated Ca2+ channels, and RIM1/2 redundantly set presynaptic Ca2+ channel density and the readily releasable vesicle pool at central and ribbon synapses, including CaV1.4-dependent release from rod photoreceptors [PMID:21402706, PMID:25343783, PMID:26400943]. Recruitment and dynamic scaffolding of RIM1 at the active zone require liprin-α2, which promotes liquid-liquid phase separation of RIM1 condensates that concentrate Ca2+ channels and ELKS [PMID:23751498]. RIM1 abundance is tuned by the synaptic E3 ubiquitin ligase SCRAPPER, which binds and ubiquitinates it for proteasomal degradation to set release probability [PMID:17803915]. Beyond the presynapse, RIM1 also acts postsynaptically, binding Rab11 to drive recycling-endosome-mediated NMDAR membrane insertion required for synaptic responses and memory [PMID:29891949]. A C2A-domain mutation (R844H) is associated with CORD7 cone-rod dystrophy and gain-of-function alteration of release, increasing active zone number, readily releasable pool size, and Ca2+ coupling [PMID:35022694, PMID:12659814].","teleology":[{"year":2001,"claim":"Established that RIM1 functions in vesicle priming through Munc13-1, defining a mechanistic basis for fusion competence at the active zone.","evidence":"Biochemical interaction assays plus neuronal electrophysiology and loss-of-function genetics showing RIM1-Munc13-1 disruption phenocopies Munc13-1 deficiency","pmids":["11343654"],"confidence":"High","gaps":["Did not resolve how priming is spatially coupled to Ca2+ channels","Structural basis of the RIM1-Munc13-1 interface not defined"]},{"year":2001,"claim":"Resolved that distinct, separable RIM1 modules mediate Rab3-GTP binding versus secretion enhancement, showing vesicle tethering and priming are mechanistically independent.","evidence":"SPR with recombinant proteins, brain-lysate pull-downs, and domain-truncation secretion assays in chromaffin cells; R33G abolishes Rab3 binding","pmids":["11431472","11278839"],"confidence":"High","gaps":["How Rab3 binding and zinc-finger priming activities are coordinated in vivo not shown","Did not address Ca2+-dependence of priming"]},{"year":2003,"claim":"Defined the Rab-binding specificity of RIM1 and showed alternative splicing of the Rab-binding helix tunes which Rabs are engaged.","evidence":"Cotransfection binding screen against 42 Rabs with mutagenesis and chimeric analysis","pmids":["12578829"],"confidence":"High","gaps":["Functional consequence of differential Rab engagement at synapses not established"]},{"year":2002,"claim":"Showed RIM1 nucleates a CAZ scaffold by directly binding CAST and bridging Munc13-1 and Bassoon, establishing the architectural role of RIM1.","evidence":"Co-IP, direct binding assays, vesicle immunoisolation, and immunolocalization","pmids":["12163476"],"confidence":"High","gaps":["Stoichiometry and higher-order assembly of the complex not resolved"]},{"year":2004,"claim":"Demonstrated that the CAST/RIM1/Bassoon ternary complex and the full CAZ assembly are functionally required for transmission, validating the scaffold's necessity.","evidence":"Direct binding assays, Co-IP, and dominant-negative peptide microinjection with electrophysiology","pmids":["14734538"],"confidence":"High","gaps":["Acute peptide perturbation does not separate scaffolding from downstream priming roles"]},{"year":2007,"claim":"Identified SCRAPPER-mediated ubiquitination as the mechanism that controls RIM1 abundance and thereby tunes release probability.","evidence":"Co-IP, ubiquitination assay, Scrapper-KO mouse electrophysiology, and bidirectional rescue with re-expression and RNAi","pmids":["17803915"],"confidence":"High","gaps":["Signals regulating SCRAPPER activity not defined","Which RIM1 pool is degraded not specified"]},{"year":2007,"claim":"Provided the first mechanistic link between the CORD7 R844H mutation and altered RIM1 regulation of P/Q- and L-type Ca2+ channels.","evidence":"Heterologous electrophysiology comparing wild-type and mutant RIM1 on CaV2.1 and CaV1.4 currents","pmids":["18690027"],"confidence":"Medium","gaps":["Single lab, heterologous system only","Did not test native photoreceptor synapses"]},{"year":2008,"claim":"Showed that RIM1α and RIM1β isoforms have distinct and overlapping roles in synaptic plasticity and survival, clarifying isoform-specific function.","evidence":"Conditional and constitutive knockout mice with electrophysiology and isoform characterization","pmids":["19074017"],"confidence":"High","gaps":["Molecular basis for differential plasticity contributions of each isoform not resolved"]},{"year":2011,"claim":"Established that RIM1 regulates voltage-gated Ca2+ channel inactivation through the CaVβ subunit, extending its role to Ca2+ influx control including in β-cell insulin secretion.","evidence":"Co-IP, whole-cell patch clamp, siRNA knockdown, and insulin ELISA","pmids":["21402706","21331761"],"confidence":"Medium","gaps":["CaV2.2 deinhibition shown only in heterologous cells [#9]","Structural basis of CaVβ interaction not defined"]},{"year":2014,"claim":"Demonstrated functional redundancy of RIM1 and RIM2 in setting presynaptic Ca2+ channel density and readily releasable pool size, explaining mild single-KO phenotypes.","evidence":"Conditional double-KO mice with direct calyx of Held presynaptic electrophysiology and qPCR","pmids":["25343783"],"confidence":"High","gaps":["Did not isolate RIM1-specific contributions independent of RIM2"]},{"year":2015,"claim":"Showed RIM1/2 are required for CaV1.4-dependent Ca2+ entry and release at rod ribbon synapses without affecting channel expression or ribbon structure, separating functional regulation from localization.","evidence":"Conditional double-KO mice with rod voltage-clamp, capacitance measurements, and immunofluorescence","pmids":["26400943"],"confidence":"High","gaps":["Mechanism by which RIM regulates CaV1.4 gating in rods not resolved"]},{"year":2013,"claim":"Identified liprin-α2 as the recruiter and dynamic regulator of RIM1 at active zones, linking scaffold turnover to vesicle pool size.","evidence":"FRAP, immunofluorescence, knockdown/overexpression, and electron microscopy in neurons","pmids":["23751498"],"confidence":"High","gaps":["Did not define the structural interface of the liprin-α2/RIM1 interaction"]},{"year":2018,"claim":"Revealed an unexpected postsynaptic role for RIM1 in Rab11-dependent NMDAR recycling and membrane insertion required for memory.","evidence":"Localization fractionation, Co-IP for Rab11, shRNA knockdown, electrophysiology, and behavioral assays","pmids":["29891949"],"confidence":"High","gaps":["How the same N-terminus serves both presynaptic Rab3 and postsynaptic Rab11 functions not resolved","Selectivity for NMDAR over AMPAR mechanism unclear"]},{"year":2022,"claim":"Provided structural and in vivo mechanistic insight into the CORD7 C2A mutation, showing a semi-dominant gain-of-function that enhances release and increases active zone number.","evidence":"CRISPR knock-in in Drosophila, 1.92 Å crystal structure of the C2A domain, voltage-clamp and focal recordings, and STED super-resolution","pmids":["35022694"],"confidence":"High","gaps":["Molecular mechanism by which the C2A mutation alters release kinetics not fully defined","Drosophila findings not directly confirmed in mammalian photoreceptors"]},{"year":2024,"claim":"Defined the structural basis of the liprin-α2/RIM1 complex and its role in driving phase separation that organizes Ca2+ channel and ELKS distribution at the active zone.","evidence":"X-ray crystallography, CRISPR knock-in, electrophysiology, super-resolution imaging, EGTA-sensitivity, and in vitro phase separation assays (preprint)","pmids":[],"confidence":"High","gaps":["Preprint, single lab","In vitro LLPS relevance to native active zone organization not fully established"]},{"year":null,"claim":"How RIM1's distinct presynaptic scaffolding and postsynaptic trafficking functions are partitioned across cell types and isoforms, and the precise mechanism linking the CORD7 mutation to retinal disease, remain open.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model integrating Rab3, Munc13, and Ca2+ channel binding in one complex","Causal CORD7 mechanism in human retina not directly demonstrated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,3,5]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[3,5,10]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[8,11,12]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,10,16]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[14]}],"pathway":[],"complexes":["cytomatrix of the active zone (CAZ) complex (CAST/RIM1/Munc13-1/Bassoon/Piccolo)"],"partners":["UNC13A","RAB3A","ERC2","BSN","CACNB","PPFIA2","RAB11A","FBXL20"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q86UR5","full_name":"Regulating synaptic membrane exocytosis protein 1","aliases":["Rab-3-interacting molecule 1","RIM 1","Rab-3-interacting protein 2"],"length_aa":1692,"mass_kda":189.1,"function":"Rab effector involved in exocytosis (By similarity). May act as scaffold protein that regulates neurotransmitter release at the active zone. Essential for maintaining normal probability of neurotransmitter release and for regulating release during short-term synaptic plasticity (By similarity). Plays a role in dendrite formation by melanocytes (PubMed:23999003)","subcellular_location":"Cell membrane; Synapse; Presynaptic cell membrane","url":"https://www.uniprot.org/uniprotkb/Q86UR5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RIMS1","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/RIMS1","total_profiled":1310},"omim":[{"mim_id":"612657","title":"CONE-ROD DYSTROPHY 12; CORD12","url":"https://www.omim.org/entry/612657"},{"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":"609894","title":"UNC13 HOMOLOG A; UNC13A","url":"https://www.omim.org/entry/609894"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"brain","ntpm":59.7}],"url":"https://www.proteinatlas.org/search/RIMS1"},"hgnc":{"alias_symbol":["RIM","KIAA0340","RIM1"],"prev_symbol":["RAB3IP2","CORD7"]},"alphafold":{"accession":"Q86UR5","domains":[{"cath_id":"3.30.60.120","chopping":"114-173","consensus_level":"medium","plddt":80.7943,"start":114,"end":173},{"cath_id":"2.30.42.10","chopping":"586-693","consensus_level":"high","plddt":83.2606,"start":586,"end":693},{"cath_id":"2.60.40.150","chopping":"743-873","consensus_level":"high","plddt":90.5137,"start":743,"end":873},{"cath_id":"2.60.40.150","chopping":"1522-1669","consensus_level":"high","plddt":90.857,"start":1522,"end":1669}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q86UR5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q86UR5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q86UR5-F1-predicted_aligned_error_v6.png","plddt_mean":51.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RIMS1","jax_strain_url":"https://www.jax.org/strain/search?query=RIMS1"},"sequence":{"accession":"Q86UR5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q86UR5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q86UR5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q86UR5"}},"corpus_meta":[{"pmid":"11343654","id":"PMC_11343654","title":"Functional interaction of the active zone proteins Munc13-1 and RIM1 in synaptic vesicle priming.","date":"2001","source":"Neuron","url":"https://pubmed.ncbi.nlm.nih.gov/11343654","citation_count":325,"is_preprint":false},{"pmid":"12163476","id":"PMC_12163476","title":"Cast: a novel protein of the cytomatrix at the active zone of synapses that forms a ternary complex with RIM1 and munc13-1.","date":"2002","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/12163476","citation_count":239,"is_preprint":false},{"pmid":"17803915","id":"PMC_17803915","title":"SCRAPPER-dependent ubiquitination of active zone protein RIM1 regulates synaptic vesicle release.","date":"2007","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/17803915","citation_count":173,"is_preprint":false},{"pmid":"11133430","id":"PMC_11133430","title":"pH signaling in Sclerotinia sclerotiorum: identification of a pacC/RIM1 homolog.","date":"2001","source":"Applied and environmental microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/11133430","citation_count":167,"is_preprint":false},{"pmid":"14734538","id":"PMC_14734538","title":"Physical and functional interaction of the active zone proteins, CAST, RIM1, and Bassoon, in neurotransmitter release.","date":"2004","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/14734538","citation_count":159,"is_preprint":false},{"pmid":"12578829","id":"PMC_12578829","title":"Distinct Rab binding specificity of Rim1, Rim2, rabphilin, and Noc2. 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RIM1 binding and vesicle priming are mediated by two distinct structural modules of Munc13-1.\",\n      \"method\": \"Biochemical interaction assays, electrophysiology in neurons, loss-of-function genetic analysis\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal functional and biochemical interaction, multiple orthogonal methods (binding assay + electrophysiology + genetic phenocopy), replicated in subsequent work\",\n      \"pmids\": [\"11343654\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"RIM1 binds Rab3-GTP (but not GDP-saturated Rab3) via a short N-terminal alpha-helical sequence (amino acids 19–55); a point mutation R33G abolishes binding. Rab3 isoforms A, C, D are bound with similar affinities (Kd=1–2 µM). The zinc finger domain of Rim1 binds Munc13 but not Rab3.\",\n      \"method\": \"Surface plasmon resonance with recombinant bacterially expressed proteins, pull-down from brain lysate, site-directed mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with SPR kinetics, mutagenesis validation, pull-down confirmation\",\n      \"pmids\": [\"11431472\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The Rab3a-GTP binding domain and the secretion-enhancing domain of RIM1 are distinct and separable: a ~30 amino acid sequence immediately N-terminal to the zinc finger constitutes the minimal Rab3a-GTP binding domain, while the zinc finger domain alone enhances secretion without binding Rab3a. N-terminal RIM1 increases the rate of ATP-dependent priming of secretion without altering Ca2+ sensitivity.\",\n      \"method\": \"Domain deletion/truncation analysis, secretion assays in intact and permeabilized adrenal chromaffin cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro functional reconstitution with defined domain truncations and exocytosis readout, multiple constructs tested\",\n      \"pmids\": [\"11278839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"CAST (CAZ-associated structural protein) directly binds RIM1 and indirectly binds Munc13-1 through RIM1, forming a ternary complex at the cytomatrix of the active zone. Bassoon is also associated with this ternary complex. CAST, RIM1, and Bassoon are co-transported on the same vesicles during synapse formation.\",\n      \"method\": \"Co-immunoprecipitation, direct binding assay, immunoisolation of vesicles with antibody-coupled beads, immunolocalization\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple Co-IP and direct binding assays, immunoisolation, replicated in subsequent work (PMID 14734538)\",\n      \"pmids\": [\"12163476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"RIM1 interacts with Rab3A/B/C/D, Rab10, Rab26, and Rab37 but not Rab27A/B or Rab8A; alternative splicing of the first alpha-helical region of the RIM1 Rab binding domain alters Rab binding specificity.\",\n      \"method\": \"Cotransfection binding assay with 42 different Rab proteins, site-directed mutagenesis, chimeric protein analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — systematic cotransfection binding screen with mutagenesis and chimeric analysis, multiple orthogonal approaches\",\n      \"pmids\": [\"12578829\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"RIM1 and Bassoon directly bind to distinct regions of CAST (C-terminus and central region, respectively), forming a ternary complex. All known CAZ proteins (CAST, RIM1, Munc13-1, Bassoon, Piccolo) form a large molecular complex in brain. Microinjection of RIM1-binding or Bassoon-binding regions of CAST, or the CAST-binding domain of RIM1 or Bassoon, impairs synaptic transmission in cultured neurons.\",\n      \"method\": \"Direct binding assay, co-immunoprecipitation, microinjection of dominant-negative peptides, electrophysiology\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding assays combined with dominant-negative functional perturbation and electrophysiology, multiple orthogonal methods\",\n      \"pmids\": [\"14734538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"SCRAPPER, a synapse-localized E3 ubiquitin ligase, directly binds and ubiquitinates RIM1, targeting it for proteasome-mediated degradation. In Scrapper-knockout neurons, RIM1 has a longer half-life and reduced ubiquitination. RIM1 degradation by SCRAPPER is required for synaptic tuning: SCR-KO mice show increased miniature EPSC frequency (phenocopied by RIM1 overexpression and rescued by SCRAPPER re-expression or RIM1 knockdown).\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, knockout mouse electrophysiology, rescue experiments with re-expression and RNAi\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding shown by Co-IP, ubiquitination assay, KO mouse with specific electrophysiological phenotype, bidirectional rescue experiments\",\n      \"pmids\": [\"17803915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The RIM1 gene encodes two isoforms from distinct promoters: RIM1α (with an N-terminal Rab3-binding sequence) and RIM1β (lacking that N-terminal sequence). RIM1β is upregulated in RIM1α knockout mice. Deletion of both isoforms severely impairs mouse survival and abolishes presynaptic long-term plasticity, while the RIM1α-only deletion impairment in synaptic strength and short-term plasticity is aggravated by double deletion.\",\n      \"method\": \"Conditional and constitutive knockout mouse generation, electrophysiology, molecular characterization of isoforms\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with defined electrophysiological phenotypes, isoform-specific molecular characterization, double vs single KO comparison\",\n      \"pmids\": [\"19074017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RIM1 interacts with the CaVβ auxiliary subunit of L-type Ca2+ channels (CaV1.2 and CaV1.3) via co-immunoprecipitation. RIM1 decreases the rate of inactivation of L-type CaV channel currents in a CaVβ-dependent manner. Knockdown of endogenous RIM1 increases current inactivation and notably impairs high K+-stimulated insulin secretion in pancreatic β-cells.\",\n      \"method\": \"Co-immunoprecipitation, whole-cell patch clamp, siRNA knockdown, ELISA for insulin secretion\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP identifying CaVβ as binding partner, functional electrophysiology and secretion assay with knockdown, multiple orthogonal methods\",\n      \"pmids\": [\"21402706\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RIM1 promotes deinhibition of CaV2.2 channels from G-protein-mediated inhibition: Rim1-expressing cells show considerably greater extent of current deinhibition following channel activation upon μ-opioid receptor stimulation, favoring sustained Ca2+ influx under prolonged activity.\",\n      \"method\": \"Whole-cell patch clamp in HEK-293 cells co-expressing CaV2.2 and μ-opioid receptor with or without Rim1\",\n      \"journal\": \"Pflugers Archiv : European journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — single lab, heterologous expression system, single electrophysiological method\",\n      \"pmids\": [\"21331761\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Liprin-α2 is required for recruitment of RIM1 (and CASK) to presynaptic active zones. Depletion of liprin-α2 reduces turnover of RIM1 at presynaptic terminals as measured by FRAP, suggesting liprin-α2 promotes dynamic scaffolding of RIM1. Liprin-α2 controls synaptic vesicle pool size and synaptic output.\",\n      \"method\": \"Fluorescence recovery after photobleaching (FRAP), immunofluorescence, knockdown/overexpression in neurons, electron microscopy\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FRAP for direct localization-function link, knockdown with defined phenotypic readouts, multiple methods in single lab\",\n      \"pmids\": [\"23751498\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RIM1 and RIM2 redundantly determine presynaptic Ca2+ channel density and readily releasable vesicle pool size at the calyx of Held synapse. Conditional double knockout of RIM1 and RIM2 strongly reduces presynaptic Ca2+ current density and RRP size, whereas single knockouts of each have only subtle or no effect.\",\n      \"method\": \"Conditional knockout mice, direct presynaptic whole-cell electrophysiology at calyx of Held, quantitative PCR\",\n      \"journal\": \"Journal of neurophysiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional genetic knockouts with direct presynaptic electrophysiology, single vs double KO comparison revealing redundancy\",\n      \"pmids\": [\"25343783\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"RIM1/2 facilitate Ca2+ entry into rod photoreceptor terminals through Cav1.4 channels, which is required for Ca2+-stimulated vesicle release. Conditional double knockout of RIM1 and RIM2 from rods causes profound reduction in Ca2+ currents and ~4-fold reduction in spontaneous miniature release events and near-complete absence of evoked responses, without altering Cav1.4 protein expression or ribbon morphology.\",\n      \"method\": \"Conditional double knockout mice, whole-cell voltage-clamp recordings from rods, membrane capacitance measurements, immunofluorescence\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional genetic knockout with direct electrophysiological recording from photoreceptors, multiple readouts, separation of channel localization from functional regulation\",\n      \"pmids\": [\"26400943\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The CORD7-associated RIM1 R655H mutation (corresponding to human R844H) modifies RIM1's regulation of voltage-dependent Ca2+ channel currents elicited by P/Q-type CaV2.1 and L-type CaV1.4 channels, suggesting altered presynaptic VDCC regulation underlies the CORD7 phenotype.\",\n      \"method\": \"Electrophysiology in heterologous expression system with wild-type vs. mutant RIM1\",\n      \"journal\": \"Channels (Austin, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — single lab, heterologous expression system, single electrophysiological method comparing WT vs mutant\",\n      \"pmids\": [\"18690027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RIM1 localizes postsynaptically in hippocampal CA1 neurons and facilitates membrane delivery of recycling NMDARs via binding to Rab11 through its N-terminus. Knockdown of RIM1 impairs both constitutive and regulated NMDAR (but not AMPAR) trafficking and membrane insertion of Rab11-positive recycling endosomes. Postsynaptic RIM1 is required for basal NMDAR-mediated synaptic responses and hippocampus-dependent memory.\",\n      \"method\": \"Immunofluorescence/fractionation for localization, Co-IP for Rab11 interaction, shRNA knockdown, electrophysiology, behavioral assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP identifying Rab11 as binding partner, knockdown with specific receptor-trafficking readout, electrophysiology, and behavioral phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"29891949\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The CORD7 mutation (R844H/R915H in fly numbering) in the C2A domain of RIM1 exerts a semi-dominant effect on synaptic transmission, resulting in faster and more efficient synaptic release, increased size of the readily releasable pool, decreased sensitivity to the fast Ca2+ chelator BAPTA, and increased number of presynaptic active zones without perturbing their nanoscopic organization. Crystal structure of the Drosophila RIM C2A domain at 1.92 Å confirmed structural conservation of the mutation site.\",\n      \"method\": \"CRISPR/Cas9 genomic knock-in of CORD7 mutation in Drosophila, X-ray crystallography, two-electrode voltage clamp electrophysiology, focal recordings, super-resolution microscopy (STED) of Bruchpilot/ELKS/CAST\",\n      \"journal\": \"Brain : a journal of neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with CRISPR knock-in, multiple electrophysiological readouts, super-resolution imaging, mechanistic mutation analysis\",\n      \"pmids\": [\"35022694\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"A G-to-A point mutation in the RIM1 (RIMS1) gene resulting in R844H substitution in the C2A domain was identified in CORD7 autosomal dominant cone-rod dystrophy. RIM1 is expressed in brain and in photoreceptors where it localizes to pre-synaptic ribbons in ribbon synapses. The RIM1 gene spans 577 kb, comprises at least 35 exons, and shows extensive alternative splicing.\",\n      \"method\": \"Mutation analysis by sequencing, segregation analysis, immunolocalization in retina/brain\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct sequencing for mutation identification, immunolocalization for subcellular position, but causal link to CORD7 later questioned (PMID 35947379)\",\n      \"pmids\": [\"12659814\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Crystal structure of the liprin-α2/RIM1 complex was determined, revealing multifaceted intermolecular interactions driving liprin-α/RIM assembly. Disrupting this interaction in neurons impairs synaptic transmission and reduces the readily releasable pool. Liprin-α promotes liquid-liquid phase separation (LLPS) of RIM1 at the active zone, and the liprin-α/RIM interaction modulates competitive distribution of ELKS1 and VGCCs in RIM1 condensates; disrupting it decreases VGCC accumulation and increases sensitivity to the slow Ca2+ buffer EGTA.\",\n      \"method\": \"X-ray crystallography, CRISPR/Cas9 knock-in mutations, electrophysiology, super-resolution imaging, EGTA sensitivity assay, in vitro phase separation assay\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure combined with functional mutagenesis in neurons, electrophysiology, and phase separation assay; single lab preprint but multiple orthogonal rigorous methods\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"RIMS1/RIM1 is a multidomain presynaptic active zone scaffold protein that binds Rab3-GTP via its N-terminal alpha-helix (critical residue R33), interacts with Munc13-1 via its zinc finger domain to prime synaptic vesicles for fusion, forms a large CAZ complex with CAST, Bassoon, Piccolo, and ELKS/CAST, facilitates Ca2+ influx by slowing inactivation of voltage-gated Ca2+ channels (CaV2.1, CaV2.2, CaV1.4) through interaction with the CaVβ auxiliary subunit, recruits and clusters Ca2+ channels at active zones via liquid-liquid phase separation promoted by liprin-α2, is targeted for proteasome-mediated degradation by the E3 ubiquitin ligase SCRAPPER to tune synaptic release probability, and also localizes postsynaptically where it binds Rab11 to facilitate recycling endosome-mediated NMDAR membrane insertion; the CORD7-associated R844H mutation in its C2A domain enhances synaptic transmission by increasing active zone number, readily releasable pool size, and tightening Ca2+ coupling.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RIMS1/RIM1 is a multidomain presynaptic active zone scaffold that couples synaptic vesicle priming to Ca2+ channel positioning and exocytosis [#0, #5]. Through a short N-terminal alpha-helix it binds Rab3-GTP (and additional Rab isoforms, with binding abolished by the R33G mutation), while a separable adjacent zinc finger domain binds Munc13-1 to enhance the ATP-dependent priming of fusion-competent vesicles [#1, #2, #4]. RIM1 nucleates the cytomatrix of the active zone by directly binding CAST and bridging it to Munc13-1 and Bassoon, together with Piccolo forming a large CAZ complex required for normal synaptic transmission [#3, #5]. It also organizes the presynaptic Ca2+ entry apparatus: RIM1 binds the CaVβ auxiliary subunit and slows inactivation of voltage-gated Ca2+ channels, and RIM1/2 redundantly set presynaptic Ca2+ channel density and the readily releasable vesicle pool at central and ribbon synapses, including CaV1.4-dependent release from rod photoreceptors [#8, #11, #12]. Recruitment and dynamic scaffolding of RIM1 at the active zone require liprin-α2, which promotes liquid-liquid phase separation of RIM1 condensates that concentrate Ca2+ channels and ELKS [#10]. RIM1 abundance is tuned by the synaptic E3 ubiquitin ligase SCRAPPER, which binds and ubiquitinates it for proteasomal degradation to set release probability [#6]. Beyond the presynapse, RIM1 also acts postsynaptically, binding Rab11 to drive recycling-endosome-mediated NMDAR membrane insertion required for synaptic responses and memory [#14]. A C2A-domain mutation (R844H) is associated with CORD7 cone-rod dystrophy and gain-of-function alteration of release, increasing active zone number, readily releasable pool size, and Ca2+ coupling [#15, #16].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established that RIM1 functions in vesicle priming through Munc13-1, defining a mechanistic basis for fusion competence at the active zone.\",\n      \"evidence\": \"Biochemical interaction assays plus neuronal electrophysiology and loss-of-function genetics showing RIM1-Munc13-1 disruption phenocopies Munc13-1 deficiency\",\n      \"pmids\": [\"11343654\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve how priming is spatially coupled to Ca2+ channels\", \"Structural basis of the RIM1-Munc13-1 interface not defined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Resolved that distinct, separable RIM1 modules mediate Rab3-GTP binding versus secretion enhancement, showing vesicle tethering and priming are mechanistically independent.\",\n      \"evidence\": \"SPR with recombinant proteins, brain-lysate pull-downs, and domain-truncation secretion assays in chromaffin cells; R33G abolishes Rab3 binding\",\n      \"pmids\": [\"11431472\", \"11278839\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Rab3 binding and zinc-finger priming activities are coordinated in vivo not shown\", \"Did not address Ca2+-dependence of priming\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defined the Rab-binding specificity of RIM1 and showed alternative splicing of the Rab-binding helix tunes which Rabs are engaged.\",\n      \"evidence\": \"Cotransfection binding screen against 42 Rabs with mutagenesis and chimeric analysis\",\n      \"pmids\": [\"12578829\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of differential Rab engagement at synapses not established\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Showed RIM1 nucleates a CAZ scaffold by directly binding CAST and bridging Munc13-1 and Bassoon, establishing the architectural role of RIM1.\",\n      \"evidence\": \"Co-IP, direct binding assays, vesicle immunoisolation, and immunolocalization\",\n      \"pmids\": [\"12163476\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and higher-order assembly of the complex not resolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrated that the CAST/RIM1/Bassoon ternary complex and the full CAZ assembly are functionally required for transmission, validating the scaffold's necessity.\",\n      \"evidence\": \"Direct binding assays, Co-IP, and dominant-negative peptide microinjection with electrophysiology\",\n      \"pmids\": [\"14734538\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Acute peptide perturbation does not separate scaffolding from downstream priming roles\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identified SCRAPPER-mediated ubiquitination as the mechanism that controls RIM1 abundance and thereby tunes release probability.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, Scrapper-KO mouse electrophysiology, and bidirectional rescue with re-expression and RNAi\",\n      \"pmids\": [\"17803915\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signals regulating SCRAPPER activity not defined\", \"Which RIM1 pool is degraded not specified\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Provided the first mechanistic link between the CORD7 R844H mutation and altered RIM1 regulation of P/Q- and L-type Ca2+ channels.\",\n      \"evidence\": \"Heterologous electrophysiology comparing wild-type and mutant RIM1 on CaV2.1 and CaV1.4 currents\",\n      \"pmids\": [\"18690027\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab, heterologous system only\", \"Did not test native photoreceptor synapses\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed that RIM1α and RIM1β isoforms have distinct and overlapping roles in synaptic plasticity and survival, clarifying isoform-specific function.\",\n      \"evidence\": \"Conditional and constitutive knockout mice with electrophysiology and isoform characterization\",\n      \"pmids\": [\"19074017\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis for differential plasticity contributions of each isoform not resolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Established that RIM1 regulates voltage-gated Ca2+ channel inactivation through the CaVβ subunit, extending its role to Ca2+ influx control including in β-cell insulin secretion.\",\n      \"evidence\": \"Co-IP, whole-cell patch clamp, siRNA knockdown, and insulin ELISA\",\n      \"pmids\": [\"21402706\", \"21331761\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"CaV2.2 deinhibition shown only in heterologous cells [#9]\", \"Structural basis of CaVβ interaction not defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated functional redundancy of RIM1 and RIM2 in setting presynaptic Ca2+ channel density and readily releasable pool size, explaining mild single-KO phenotypes.\",\n      \"evidence\": \"Conditional double-KO mice with direct calyx of Held presynaptic electrophysiology and qPCR\",\n      \"pmids\": [\"25343783\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not isolate RIM1-specific contributions independent of RIM2\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showed RIM1/2 are required for CaV1.4-dependent Ca2+ entry and release at rod ribbon synapses without affecting channel expression or ribbon structure, separating functional regulation from localization.\",\n      \"evidence\": \"Conditional double-KO mice with rod voltage-clamp, capacitance measurements, and immunofluorescence\",\n      \"pmids\": [\"26400943\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which RIM regulates CaV1.4 gating in rods not resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identified liprin-α2 as the recruiter and dynamic regulator of RIM1 at active zones, linking scaffold turnover to vesicle pool size.\",\n      \"evidence\": \"FRAP, immunofluorescence, knockdown/overexpression, and electron microscopy in neurons\",\n      \"pmids\": [\"23751498\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the structural interface of the liprin-α2/RIM1 interaction\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Revealed an unexpected postsynaptic role for RIM1 in Rab11-dependent NMDAR recycling and membrane insertion required for memory.\",\n      \"evidence\": \"Localization fractionation, Co-IP for Rab11, shRNA knockdown, electrophysiology, and behavioral assays\",\n      \"pmids\": [\"29891949\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the same N-terminus serves both presynaptic Rab3 and postsynaptic Rab11 functions not resolved\", \"Selectivity for NMDAR over AMPAR mechanism unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Provided structural and in vivo mechanistic insight into the CORD7 C2A mutation, showing a semi-dominant gain-of-function that enhances release and increases active zone number.\",\n      \"evidence\": \"CRISPR knock-in in Drosophila, 1.92 Å crystal structure of the C2A domain, voltage-clamp and focal recordings, and STED super-resolution\",\n      \"pmids\": [\"35022694\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which the C2A mutation alters release kinetics not fully defined\", \"Drosophila findings not directly confirmed in mammalian photoreceptors\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined the structural basis of the liprin-α2/RIM1 complex and its role in driving phase separation that organizes Ca2+ channel and ELKS distribution at the active zone.\",\n      \"evidence\": \"X-ray crystallography, CRISPR knock-in, electrophysiology, super-resolution imaging, EGTA-sensitivity, and in vitro phase separation assays (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Preprint, single lab\", \"In vitro LLPS relevance to native active zone organization not fully established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How RIM1's distinct presynaptic scaffolding and postsynaptic trafficking functions are partitioned across cell types and isoforms, and the precise mechanism linking the CORD7 mutation to retinal disease, remain open.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model integrating Rab3, Munc13, and Ca2+ channel binding in one complex\", \"Causal CORD7 mechanism in human retina not directly demonstrated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 3, 5]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [3, 5, 10]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [8, 11, 12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 10, 16]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": []}\n    ],\n    \"complexes\": [\"cytomatrix of the active zone (CAZ) complex (CAST/RIM1/Munc13-1/Bassoon/Piccolo)\"],\n    \"partners\": [\"UNC13A\", \"RAB3A\", \"ERC2\", \"BSN\", \"CACNB\", \"PPFIA2\", \"RAB11A\", \"FBXL20\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}