{"gene":"CADPS","run_date":"2026-04-28T17:28:52","timeline":{"discoveries":[{"year":1992,"finding":"A novel 145 kDa brain cytosolic protein (p145, later named CAPS) was identified as the cytosolic factor that reconstitutes Ca2+-activated dense-core vesicle (DCV) exocytosis in permeable neuroendocrine (PC12) cells. The protein forms dimers, exhibits Ca2+-dependent interaction with hydrophobic matrices, and binds phospholipid vesicles, indicating a membrane-associated function. A p145-specific antibody inhibits Ca2+-activated secretion, demonstrating an essential role.","method":"Biochemical reconstitution of Ca2+-dependent secretion in permeabilized PC12 cells; antibody inhibition; phospholipid binding assay","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 — reconstitution in permeable cells, antibody inhibition, multiple orthogonal biochemical assays in foundational paper","pmids":["1516133"],"is_preprint":false},{"year":1992,"finding":"PKC stimulation of Ca2+-dependent norepinephrine secretion from semi-intact PC12 cells requires the presence of p145 (CAPS). PKC phosphorylates p145 under conditions of fully reconstituted Ca2+-activated secretion, suggesting that PKC's stimulatory effect on exocytosis is mediated largely through p145/CAPS phosphorylation.","method":"PKC-deficient semi-intact PC12 cell reconstitution assay; phosphorylation analysis of p145 with purified PKC","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — cell-based reconstitution with defined components, single lab","pmids":["1429734"],"is_preprint":false},{"year":1993,"finding":"The C. elegans gene unc-31 (ortholog of CADPS/CAPS) affects multiple nervous system-controlled functions including locomotion, feeding, egg-laying, and dauer larvae recovery, establishing an early genetic requirement for UNC-31 in neurosecretion in vivo.","method":"Forward genetic screen; behavioral phenotyping of loss-of-function mutants in C. elegans","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 2 — clean loss-of-function genetics with multiple defined phenotypes, ortholog confirmed","pmids":["8325482"],"is_preprint":false},{"year":1997,"finding":"Rat CAPS cDNA was cloned and the protein was identified as the vertebrate homologue of C. elegans UNC-31. Recombinant CAPS reconstitutes the Ca2+-dependent triggering step (but not the ATP-dependent priming step) in permeable PC12 cells. CAPS binds Ca2+ with moderate affinity (Kd ~270 µM, 2 mol Ca2+/mol dimer), consistent with a role at a Ca2+-regulated step in exocytosis.","method":"cDNA cloning; recombinant protein reconstitution of Ca2+-triggered exocytosis in permeable PC12 cells; Ca2+-binding assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — recombinant protein reconstitution plus Ca2+-binding biochemistry in foundational cloning paper","pmids":["9289490"],"is_preprint":false},{"year":1998,"finding":"CAPS localizes as a peripherally membrane-associated protein to the plasma membrane and to dense-core vesicles (DCVs) but not to small clear synaptic vesicles (SVs) in brain homogenates. CAPS exhibits high-affinity, saturable binding to DCVs via bilayer phospholipids. CAPS antibodies inhibit Ca2+-activated norepinephrine release from lysed synaptosomes, indicating membrane-bound CAPS is essential for neural DCV exocytosis.","method":"Subcellular fractionation; DCV binding assay; antibody inhibition of norepinephrine release from synaptosomes","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 — reciprocal localization by fractionation, DCV binding assay, and functional antibody inhibition; multiple orthogonal methods","pmids":["9697858"],"is_preprint":false},{"year":1998,"finding":"CAPS specifically binds phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2] but not other phosphoinositides (including PI(3,4)P2 and PI(3,4,5)P3). PI(4,5)P2 binding promotes a conformational change in CAPS (altered protease susceptibility) and involves a hydrophobic interaction demonstrated by photoaffinity labeling. CAPS is proposed to function as a PI(4,5)P2 effector in regulated exocytosis.","method":"Liposome binding assay; limited proteolysis; photoaffinity labeling with PI(4,5)P2 analog","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — multiple in vitro biochemical methods (liposome binding, proteolysis, photoaffinity labeling) with specificity controls","pmids":["9525942"],"is_preprint":false},{"year":2000,"finding":"CAPS is required specifically for the rapid, high-Ca2+-sensitivity component of dense-core vesicle exocytosis in rat melanotrophs. Anti-CAPS antibody abolishes the rapid (but not the slow) capacitance component evoked by flash photolysis of caged Ca2+. Both components require SNARE-dependent fusion (blocked by BoNT/B and BoNT/E). Immunocytochemistry shows CAPS is present on only a subset of DCVs, defining two parallel DCV exocytosis pathways.","method":"Patch-clamp membrane capacitance measurement; flash photolysis of caged Ca2+; CAPS antibody injection; botulinum neurotoxin treatment; immunocytochemistry in rat melanotrophs","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 — direct electrophysiological assay with antibody perturbation, neurotoxin controls, and immunolocalization; multiple orthogonal methods","pmids":["10792045"],"is_preprint":false},{"year":2001,"finding":"Drosophila CAPS (dCAPS) is essential for dense-core vesicle (DCV) release and modulates synaptic vesicle fusion. Null dCAPS mutants show embryonic lethality, 50% reduction in evoked glutamatergic transmission, accumulation of synaptic vesicles at active zones, and a 3-fold accumulation of DCVs in synaptic terminals. Cell-autonomous transgenic rescue in motoneurons fails to restore neurotransmission, revealing a cell-nonautonomous role in synaptic vesicle fusion.","method":"Genetic null mutants; electrophysiology at NMJ; electron microscopy of synaptic terminals; targeted transgenic rescue","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 — clean null mutants with electrophysiology, EM, and rescue experiments; multiple orthogonal approaches","pmids":["11516399"],"is_preprint":false},{"year":2002,"finding":"CAPS1 protein localizes exclusively to neural and endocrine tissues including adrenal medulla, pancreatic islets, anterior pituitary, thyroid parafollicular C cells, GI G cells, renal juxtaglomerular cells, and CNS gray matter, consistent with a widespread role in regulated DCV exocytosis in the nervous and endocrine systems.","method":"Immunohistochemistry of multiple tissue types","journal":"Annals of the New York Academy of Sciences","confidence":"Medium","confidence_rationale":"Tier 3 — immunolocalization across tissues, single method","pmids":["12438120"],"is_preprint":false},{"year":2003,"finding":"Human CADPS and CADPS2 were cloned and characterized as homologs of mouse Cadps. Both proteins contain a C2 domain implicated in calcium and phospholipid interactions. CADPS expression is restricted to neural and endocrine tissues, while CADPS2 is expressed ubiquitously, suggesting CADPS functions as a calcium sensor in regulated exocytosis and CADPS2 in constitutive vesicle trafficking.","method":"Full-length cDNA cloning; domain analysis (C2 domain identification); Northern/RT-PCR expression profiling; mutation screening","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 3 — cloning and domain identification with expression analysis; no direct functional reconstitution of human protein","pmids":["12659812"],"is_preprint":false},{"year":2003,"finding":"CAPS2 (the second mammalian CAPS isoform) was cloned and found to functionally rescue LDCV exocytosis from PC12 cells similarly to CAPS1. Both isoforms localize to synaptic cytosol fractions and vesicular fractions in brain. CAPS1 is enriched specifically in glutamatergic nerve terminals by ultrastructural analysis. CAPS2 is expressed in lung, liver, and testis in addition to brain, unlike the brain/neuroendocrine-restricted CAPS1.","method":"cDNA cloning; PC12 cell exocytosis reconstitution; subcellular fractionation of brain; immunoelectron microscopy","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — functional reconstitution combined with subcellular fractionation and immunoelectron microscopy","pmids":["14530279"],"is_preprint":false},{"year":2005,"finding":"CAPS1 was identified as a D2 dopamine receptor interacting protein (DRIP) in a yeast two-hybrid screen. The interaction was confirmed by pulldown and co-immunoprecipitation. The D2 receptor binding site was mapped to the C-terminal region of CAPS1. In PC12 cells, CAPS1 and D2 receptors colocalize in cytosolic and plasma membrane compartments. Overexpression of a truncated D2 receptor fragment specifically reduces K+-evoked dopamine (but not norepinephrine or BDNF) release, suggesting D2 receptors modulate dopamine vesicle release via direct interaction with CAPS.","method":"Yeast two-hybrid screen; pulldown; co-immunoprecipitation; deletion mapping; immunofluorescence colocalization; dopamine release assay in PC12 cells","journal":"Biochemical pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 — Y2H confirmed by reciprocal Co-IP and pulldown, plus functional rescue; single lab","pmids":["15857609"],"is_preprint":false},{"year":2006,"finding":"CAPS1 and CAPS2 show complementary expression in the embryonic nervous system and distinct distributions in the postnatal brain. CAPS2 distribution patterns coincide with BDNF in multiple brain regions, and CAPS2 immunolabels colocalize with exocytosis-related proteins (VAMP, SNAP-25) and endocytosis-related dynamin I in cell soma and processes, suggesting CAPS2 is involved in BDNF secretion in many brain areas.","method":"Immunohistochemistry; double-label immunofluorescence colocalization in mouse brain sections","journal":"The Journal of comparative neurology","confidence":"Medium","confidence_rationale":"Tier 3 — immunohistochemical colocalization across brain regions, multiple markers; strong correlation but indirect","pmids":["16506193"],"is_preprint":false},{"year":2007,"finding":"UNC-31 (C. elegans CAPS ortholog) is required for docking of dense-core vesicles (DCVs) at the plasma membrane, as demonstrated by TIRF microscopy of single DCV fusion events. The DCV docking defect in unc-31 mutants is fully rescued by PKA activation. UNC-31 is also required for UNC-13-mediated augmentation of DCV exocytosis.","method":"Membrane capacitance measurement; amperometry; TIRF microscopy of single DCV docking/fusion in cultured C. elegans neurons; mutant epistasis analysis","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1–2 — direct single-vesicle imaging combined with electrophysiology and epistasis; multiple orthogonal methods","pmids":["18031683"],"is_preprint":false},{"year":2007,"finding":"Tomosyn (TOM-1) negatively regulates UNC-31 (CAPS)-dependent dense-core vesicle exocytosis in C. elegans. Loss of TOM-1 suppresses the DCV accumulation, electrophysiological defects, and behavioral phenotypes of unc-31 mutants. Double mutant analysis distinguishes direct effects on DCV release from secondary effects via altered synaptic vesicle release.","method":"Genetic epistasis (tom-1;unc-31 double mutants); electron microscopy; electrophysiology; behavioral assays in C. elegans","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — clean genetic epistasis with EM, electrophysiology, and behavioral validation; multiple orthogonal approaches","pmids":["17881523"],"is_preprint":false},{"year":2008,"finding":"CAPS2-/- and CAPS1+/-;CAPS2-/- mice are glucose intolerant due to reduced glucose-induced insulin secretion, correlating with diminished Ca2+-dependent exocytosis, reduced morphologically docked vesicle pool, decreased readily releasable pool, slowed granule priming, and suppressed second-phase insulin secretion. CAPS1+/-;CAPS2-/- beta cells show reduced insulin content and granule numbers with increased lysosome activity, indicating CAPS proteins regulate insulin granule priming, exocytosis, and stability.","method":"Knockout mouse phenotyping; glucose tolerance test; patch-clamp capacitance measurement; electron microscopy; lysosomal enzyme activity assay","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 — clean KO with multiple orthogonal physiological, electrophysiological, and ultrastructural readouts","pmids":["18177725"],"is_preprint":false},{"year":2009,"finding":"CAPS drives trans-SNARE complex formation and membrane fusion in a reconstituted SNARE-dependent liposome fusion assay. CAPS stimulation requires PI(4,5)P2 in acceptor liposomes and is independent of Ca2+ alone, but Ca2+ dependence is restored by synaptotagmin. CAPS binds syntaxin-1, and truncations that competitively inhibit syntaxin-1 binding also inhibit CAPS-dependent fusion, establishing CAPS as a priming protein that accelerates fusion by promoting trans-SNARE complex assembly.","method":"Reconstituted SNARE-dependent liposome fusion assay; CAPS truncation analysis; syntaxin-1 binding assay; PI(4,5)P2 requirement assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — fully reconstituted in vitro fusion assay with mutagenesis/truncation analysis; strong mechanistic evidence","pmids":["19805029"],"is_preprint":false},{"year":2010,"finding":"CAPS exhibits high-affinity binding to syntaxin-1 and SNAP-25 and moderate affinity binding to VAMP-2. CAPS binding is specific for exocytic SNARE isoforms and requires membrane integration of SNARE proteins. CAPS binding to syntaxin-1 is mediated by SNARE motifs and occurs at a C-terminal site that does not overlap the Munc18-1 binding site, allowing CAPS and Munc18-1 to co-reside on membrane-integrated syntaxin-1.","method":"Liposome co-sedimentation; binding affinity measurements; SNARE isoform specificity assays; CAPS-stimulated liposome fusion with syntaxin-1 truncation mutants","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro binding with multiple SNARE proteins, isoform specificity controls, and functional fusion assay with mutants","pmids":["20826818"],"is_preprint":false},{"year":2010,"finding":"CAPS1 interacts specifically with class II ARF GTPases (ARF4 and ARF5) but not other ARF classes, via its pleckstrin homology (PH) domain in a GDP-bound form-specific manner. The PH domain recruits ARF4/ARF5 to the Golgi complex. Knockdown of CAPS1 or ARF4/ARF5 causes accumulation of chromogranin (DCV marker) in the Golgi and reduces DCV secretion. CAPS1-binding-deficient ARF5 mutants phenocopy this DCV trafficking defect, establishing a role for somal CAPS1 in TGN-to-DCV trafficking.","method":"Co-immunoprecipitation; GST pulldown; yeast two-hybrid; siRNA knockdown; Golgi localization by immunofluorescence; chromogranin secretion assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP confirmed by pulldown and Y2H; GDP-specificity biochemistry; functional rescue with binding-deficient mutants","pmids":["20921225"],"is_preprint":false},{"year":2011,"finding":"The Munc13 homology domain-1 (MHD1) of CAPS was identified as the core SNARE-binding domain. CAPS lacking a single helix in MHD1 fails to bind SNARE proteins and cannot support Ca2+-triggered exocytosis of either docked or newly arrived dense-core vesicles in PC12 cells, demonstrating that SNARE protein binding via MHD1 is essential for CAPS function in DCV exocytosis.","method":"Domain deletion/mutation analysis; SNARE binding assay; Ca2+-triggered DCV exocytosis assay in PC12 cells","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 1 — structure-function mutagenesis linking specific domain to SNARE binding and functional exocytosis","pmids":["21803295"],"is_preprint":false},{"year":2013,"finding":"Conditional knockout of CAPS1 in forebrain causes reduced DCV marker (secretogranin II) immunoreactivity, reduced presynaptic DCV numbers, dilated trans-Golgi cisternae, and reduced TGN marker syntaxin-6, establishing CAPS1's role in TGN-to-DCV trafficking. Cerebellar-specific CAPS1 cKO reduces BDNF along climbing fibers and decreases DCV numbers at climbing fiber synapses, impairing synaptic transmission by reducing presynaptic release probability.","method":"Conditional knockout mice; immunohistochemistry; electron microscopy; electrophysiology (EPSC amplitude and paired-pulse depression) at climbing fiber–Purkinje cell synapses","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with EM, immunohistochemistry, and in vivo electrophysiology; multiple orthogonal readouts","pmids":["24174665"],"is_preprint":false},{"year":2015,"finding":"CAPS resides on dense-core vesicles (DCVs) as a resident protein and is present in clusters (~9 molecules) near the plasma membrane at sites of vesicle docking. CAPS accompanies vesicles to the plasma membrane and is present at all exocytic events imaged by TIRF microscopy. shRNA knockdown of CAPS eliminates VAMP-2-dependent vesicle docking and evoked exocytosis. A CAPS mutant that does not localize to vesicles (CAPS ΔC135) fails to rescue docking or exocytosis, establishing that CAPS residence on vesicles is essential for docking and fusion competence.","method":"TIRF microscopy of single-vesicle fusion events in live PC12 cells; shRNA knockdown; CAPS truncation mutant rescue experiments","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — live single-vesicle imaging combined with KD and structure-function rescue; multiple orthogonal approaches","pmids":["26700319"],"is_preprint":false},{"year":2016,"finding":"CAPS1 pre-mRNA undergoes adenosine-to-inosine RNA editing resulting in a glutamate-to-glycine conversion in its C-terminal region. Mice expressing only edited CAPS1 show increased DCV exocytosis in chromaffin cells and neurons, and edited CAPS1 preferentially binds the activated (open) conformation of syntaxin-1A. This demonstrates that A-to-I RNA editing of CAPS1 modulates DCV exocytosis by altering its interaction with the exocytotic SNARE machinery.","method":"RNA editing knock-in mice; electrophysiological DCV exocytosis assay in chromaffin cells; co-immunoprecipitation of CAPS1 with syntaxin-1A conformational mutants","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — knock-in mouse model with electrophysiology and direct biochemical binding assay; multiple orthogonal methods","pmids":["27851964"],"is_preprint":false},{"year":2017,"finding":"CAPS-1 requires its C2, pleckstrin homology (PH), MHD1, and DCV-binding domains for DCV exocytosis in mammalian hippocampal neurons. Mutations in C2 (K428E or G476E) or PH (R558D/K560E/K561E) domains do not affect synaptic enrichment of CAPS-1, but all mutants rescue DCV exocytosis to only ~20% of wild-type capacity. Truncation of the C-terminus impairs synaptic enrichment. CAPS deficiency impairs DCV exocytosis more severely (96% inhibition) than SV exocytosis (39% inhibition).","method":"CAPS-1/-2 double knockout mouse hippocampal neurons; domain mutation rescue assay; DCV exocytosis imaging; SV exocytosis electrophysiology","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 — systematic domain mutagenesis rescue in null neurons with multiple functional readouts","pmids":["28883501"],"is_preprint":false},{"year":2019,"finding":"CAPS1 is upregulated in colorectal cancer and promotes cancer cell migration, invasion, and liver metastasis in vivo without affecting proliferation. CAPS1 induces epithelial-mesenchymal transition (EMT) by decreasing E-cadherin/ZO-1 and increasing N-cadherin/Snail. Snail knockdown reverses CAPS1-induced EMT. CAPS1 binds Septin2 and p85 (PI3K subunit), and PI3K/Akt inhibitors abolish CAPS1-induced Akt/GSK3β activity and Snail upregulation, placing CAPS1 in a PI3K/Akt/GSK3β/Snail signaling axis for metastasis.","method":"Overexpression and knockdown in CRC cell lines; in vivo liver metastasis model; co-immunoprecipitation of CAPS1 with Septin2 and p85; PI3K inhibitor treatment; EMT marker immunoblotting","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2–3 — Co-IP binding partners, pharmacological pathway inhibition, in vivo model; single lab","pmids":["30742066"],"is_preprint":false}],"current_model":"CADPS (CAPS1) is a multi-domain neural/endocrine protein that resides on dense-core vesicles (DCVs) and at the plasma membrane, where it promotes vesicle docking and priming by directly binding all three neuronal SNARE proteins (syntaxin-1, SNAP-25, VAMP-2) via its MHD1 domain, driving trans-SNARE complex assembly in a PI(4,5)P2-dependent manner; it also facilitates DCV trafficking from the trans-Golgi network via interaction with ARF4/ARF5 GTPases through its PH domain, and its activity is modulated by A-to-I RNA editing (altering syntaxin-1A binding preference), PKA/PKC phosphorylation, and interaction with the D2 dopamine receptor."},"narrative":{"teleology":[{"year":1992,"claim":"The identity of the cytosolic factor required for Ca²⁺-activated DCV exocytosis was unknown; purification of a 145-kDa brain protein (p145/CAPS) that reconstitutes secretion in permeable PC12 cells and whose antibody blocks release established CAPS as an essential exocytosis factor.","evidence":"Biochemical reconstitution and antibody inhibition in permeabilized PC12 cells","pmids":["1516133"],"confidence":"High","gaps":["Molecular identity (cDNA) not yet known","Mechanism of action on fusion machinery undefined","In vivo relevance undemonstrated"]},{"year":1993,"claim":"Whether CAPS function was conserved in vivo was untested; identification of C. elegans unc-31 as a CAPS ortholog whose loss causes pleiotropic neurosecretory defects established a conserved genetic requirement for CAPS in regulated secretion.","evidence":"Forward genetic screen and behavioral phenotyping in C. elegans unc-31 loss-of-function mutants","pmids":["8325482"],"confidence":"Medium","gaps":["Molecular mechanism linking UNC-31 to exocytosis unknown","Vertebrate in vivo function not yet tested"]},{"year":1997,"claim":"Cloning of rat CAPS cDNA and demonstration that recombinant protein reconstitutes Ca²⁺-triggered (but not ATP-dependent priming) exocytosis placed CAPS at the Ca²⁺-dependent triggering step and revealed moderate-affinity Ca²⁺ binding.","evidence":"cDNA cloning; recombinant protein reconstitution in permeable PC12 cells; Ca²⁺-binding assay","pmids":["9289490"],"confidence":"High","gaps":["Subcellular localization unresolved","Lipid-binding specificity untested","SNARE interaction not yet demonstrated"]},{"year":1998,"claim":"Two key questions—where CAPS acts and what lipid signals govern it—were resolved: CAPS localizes to DCVs and plasma membrane (not synaptic vesicles) and specifically binds PI(4,5)P2, which induces a conformational change, establishing CAPS as a PI(4,5)P2-effector on DCVs.","evidence":"Subcellular fractionation; liposome binding with phosphoinositide specificity controls; limited proteolysis and photoaffinity labeling","pmids":["9697858","9525942"],"confidence":"High","gaps":["Direct SNARE interaction not demonstrated","Role in vesicle docking vs. fusion not distinguished"]},{"year":2000,"claim":"Whether CAPS participates in all or a subset of DCV fusion events was unclear; electrophysiological dissection in melanotrophs showed CAPS is required specifically for the rapid, high-Ca²⁺-sensitivity component of DCV exocytosis, defining a CAPS-dependent and a CAPS-independent DCV release pathway.","evidence":"Patch-clamp capacitance with flash photolysis of caged Ca²⁺; antibody injection; botulinum neurotoxin controls in rat melanotrophs","pmids":["10792045"],"confidence":"High","gaps":["Identity of CAPS-independent pathway unknown","Mechanism by which CAPS confers rapid kinetics unresolved"]},{"year":2001,"claim":"Drosophila null mutants established that CAPS is essential for DCV release and contributes to synaptic vesicle fusion, with DCV accumulation in terminals confirming a role upstream of fusion.","evidence":"Genetic nulls with electrophysiology, electron microscopy, and transgenic rescue at Drosophila NMJ","pmids":["11516399"],"confidence":"High","gaps":["Mechanism of effect on synaptic vesicle fusion unclear (cell-nonautonomous)","Vertebrate knockout not yet available"]},{"year":2007,"claim":"Single-vesicle imaging in C. elegans neurons revealed UNC-31/CAPS is required for DCV docking at the plasma membrane—a step upstream of fusion—and that this docking defect is bypassed by PKA activation, linking CAPS to PKA-dependent priming.","evidence":"TIRF microscopy of single DCV events; amperometry and capacitance in cultured C. elegans neurons; epistasis with unc-13","pmids":["18031683"],"confidence":"High","gaps":["Direct biochemical mechanism of docking promotion unknown","PKA phosphorylation site on CAPS not mapped"]},{"year":2008,"claim":"Vertebrate in vivo relevance was confirmed: CAPS2 knockout and CAPS1/2 compound mutant mice show glucose intolerance due to impaired insulin granule priming and exocytosis, establishing CAPS as essential for pancreatic β-cell function.","evidence":"Knockout mice; glucose tolerance tests; patch-clamp capacitance; electron microscopy; lysosomal enzyme assay in β-cells","pmids":["18177725"],"confidence":"High","gaps":["Relative contributions of CAPS1 vs. CAPS2 in β-cells not fully resolved","CAPS1 single-KO β-cell phenotype not reported"]},{"year":2009,"claim":"The central mechanistic question—how CAPS promotes fusion—was answered by reconstituted liposome assays showing CAPS drives trans-SNARE complex assembly in a PI(4,5)P2-dependent, syntaxin-1-binding-dependent manner, establishing it as a bona fide priming factor.","evidence":"Reconstituted SNARE-dependent liposome fusion assay with truncation analysis and PI(4,5)P2 requirement","pmids":["19805029"],"confidence":"High","gaps":["Structural basis of CAPS–syntaxin interaction unresolved","Relationship to Munc13-mediated priming not fully delineated"]},{"year":2010,"claim":"CAPS was shown to bind all three neuronal SNAREs (syntaxin-1, SNAP-25, VAMP-2) with isoform specificity and at a syntaxin-1 site distinct from Munc18-1, and separately to interact with ARF4/ARF5 via its PH domain to mediate TGN-to-DCV trafficking, revealing a dual function in vesicle biogenesis and priming.","evidence":"Liposome co-sedimentation for SNARE binding; Co-IP and pulldown for ARF4/ARF5; siRNA knockdown with chromogranin secretion assay","pmids":["20826818","20921225"],"confidence":"High","gaps":["Structural model of CAPS–SNARE complex lacking","How ARF-binding and SNARE-binding functions are coordinated in vivo is unclear"]},{"year":2011,"claim":"The MHD1 domain was identified as the core SNARE-binding unit; a single-helix deletion abolishes both SNARE binding and exocytosis, pinpointing the minimal functional domain.","evidence":"Domain deletion/mutation analysis with SNARE binding and Ca²⁺-triggered exocytosis assays in PC12 cells","pmids":["21803295"],"confidence":"High","gaps":["Atomic-resolution structure of MHD1–SNARE interface not determined","Whether MHD1 opens closed syntaxin directly is unresolved"]},{"year":2015,"claim":"Live single-vesicle imaging established that CAPS is a resident DCV protein present at all exocytic events, and that vesicle-localized CAPS (~9-molecule clusters) is essential for VAMP-2-dependent docking and fusion, resolving the question of whether CAPS acts from the vesicle or plasma membrane.","evidence":"TIRF microscopy of single DCV events in PC12 cells; shRNA knockdown; CAPS ΔC135 vesicle-targeting mutant rescue","pmids":["26700319"],"confidence":"High","gaps":["Mechanism of CAPS recruitment to DCV membrane not defined","Whether stoichiometry of ~9 molecules is functionally required is untested"]},{"year":2016,"claim":"A-to-I RNA editing of CAPS1 was shown to enhance DCV exocytosis by shifting CAPS1 binding preference toward open syntaxin-1A, revealing a post-transcriptional regulatory mechanism that tunes secretory output.","evidence":"RNA editing knock-in mice; chromaffin cell electrophysiology; Co-IP with syntaxin-1A conformational mutants","pmids":["27851964"],"confidence":"High","gaps":["Physiological contexts controlling editing levels are unknown","Whether editing affects CAPS2 is untested"]},{"year":2017,"claim":"Systematic domain mutagenesis in CAPS-null hippocampal neurons confirmed that C2, PH, MHD1, and DCV-binding domains are each required for DCV exocytosis, and quantified a 96% inhibition of DCV exocytosis vs. 39% for SV exocytosis in the absence of CAPS.","evidence":"CAPS1/2 double-KO hippocampal neurons; domain mutation rescue; DCV exocytosis imaging and SV electrophysiology","pmids":["28883501"],"confidence":"High","gaps":["Mechanism of partial SV exocytosis impairment not characterized","Interdomain cooperativity not structurally resolved"]},{"year":null,"claim":"A high-resolution structure of CAPS (full-length or MHD1–SNARE complex) is lacking, the mechanism by which CAPS cooperates with or is distinguished from Munc13 in priming remains incompletely defined, and how somatic TGN-trafficking and synaptic priming functions are spatiotemporally coordinated is unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No crystal or cryo-EM structure available","Functional overlap with Munc13 not delineated at molecular level","In vivo regulation of CAPS by PKA phosphorylation site not mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[5,16,23]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[16,17,19,21]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[18,19]}],"localization":[{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[4,21]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[4,11,21]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,10]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[18,20]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,4,6,13,16,21]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[2,7,13,20,23]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,11,22]}],"complexes":[],"partners":["STX1A","SNAP25","VAMP2","ARF4","ARF5","DRD2","STXBP5"],"other_free_text":[]},"mechanistic_narrative":"CADPS (CAPS1) is a calcium-dependent activator of dense-core vesicle (DCV) exocytosis that functions as a vesicle-resident priming factor in neural and endocrine cells [PMID:1516133, PMID:9697858, PMID:12438120]. It drives trans-SNARE complex assembly by directly binding syntaxin-1, SNAP-25, and VAMP-2 through its Munc13-homology domain 1 (MHD1) in a PI(4,5)P2-dependent manner, thereby promoting vesicle docking and fusion competence [PMID:19805029, PMID:20826818, PMID:21803295, PMID:26700319]. CADPS also facilitates DCV biogenesis and trafficking from the trans-Golgi network through PH domain–mediated interaction with ARF4/ARF5 GTPases, and its activity is modulated by PKC phosphorylation, A-to-I RNA editing that alters syntaxin-1A binding preference, and interaction with D2 dopamine receptors [PMID:20921225, PMID:1429734, PMID:27851964, PMID:15857609]. Loss of CAPS proteins in pancreatic β-cells impairs insulin granule priming and glucose-stimulated insulin secretion, and CAPS orthologs are essential for neurosecretion-dependent behaviors in C. elegans and Drosophila [PMID:18177725, PMID:8325482, PMID:11516399]."},"prefetch_data":{"uniprot":{"accession":"Q9ULU8","full_name":"Calcium-dependent secretion activator 1","aliases":["Calcium-dependent activator protein for secretion 1","CAPS-1"],"length_aa":1353,"mass_kda":152.8,"function":"Calcium-binding protein involved in exocytosis of vesicles filled with neurotransmitters and neuropeptides. Probably acts upstream of fusion in the biogenesis or maintenance of mature secretory vesicles. Regulates catecholamine loading of DCVs. May specifically mediate the Ca(2+)-dependent exocytosis of large dense-core vesicles (DCVs) and other dense-core vesicles by acting as a PtdIns(4,5)P2-binding protein that acts at prefusion step following ATP-dependent priming and participates in DCVs-membrane fusion. 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PtdIns(4,5)P2 binding induces a conformational change in CAPS as shown by altered protease susceptibility and photoaffinity labeling, suggesting CAPS functions as a PtdIns(4,5)P2 effector in regulated exocytosis.\",\n      \"method\": \"Liposome binding assay, limited proteolysis (trypsin/proteinase K), photoaffinity labeling with PtdIns(4,5)P2 derivative\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal in vitro biochemical methods in a single study\",\n      \"pmids\": [\"9525942\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"CAPS antibody inhibits the rapid (low-Ca2+) but not the slow component of dense-core vesicle exocytosis in rat melanotrophs, and CAPS immunoreactivity is present on only a subset of dense-core vesicles, indicating CAPS is required for a Ca2+-sensitive rapid pathway of DCV exocytosis acting at a late stage.\",\n      \"method\": \"Patch-clamp membrane capacitance measurements with flash photolysis of caged Ca2+, immunocytochemistry, botulinum neurotoxin treatment\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — functional reconstitution with antibody inhibition and orthogonal methods\",\n      \"pmids\": [\"10792045\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Drosophila CAPS (dCAPS) is required for dense-core vesicle release and modulates synaptic vesicle fusion at glutamatergic NMJ synapses; null mutants show 3-fold accumulation of DCVs at synaptic terminals and 50% loss of evoked glutamatergic transmission, with a cell-nonautonomous component.\",\n      \"method\": \"Genetic null mutant analysis, electron microscopy, electrophysiology, targeted transgenic rescue\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in null mutant with specific phenotypic readouts\",\n      \"pmids\": [\"11516399\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Human CADPS (CAPS1) is restricted in expression to neural and endocrine tissues and encodes a C2 domain implicated in calcium and phospholipid interactions, consistent with a role as a calcium sensor in regulated dense-core vesicle exocytosis; CADPS spans 475 kb on chromosome 3p21.1.\",\n      \"method\": \"Full-length cDNA cloning, expression pattern analysis by RT-PCR/Northern, domain identification by sequence analysis\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — cloning and expression characterization, domain identification without in vitro functional validation\",\n      \"pmids\": [\"12659812\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CAPS1 and CAPS2 show largely complementary expression patterns in the brain; CAPS2 distribution overlaps with BDNF in multiple brain regions and colocalizes with exocytosis/endocytosis markers (VAMP, SNAP-25, Dynamin I), suggesting CAPS2 is involved in BDNF secretion from distinct neuronal populations.\",\n      \"method\": \"Immunohistochemistry, co-localization analysis in mouse brain sections\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — immunohistochemical co-localization; functional link inferred but not directly tested\",\n      \"pmids\": [\"16506193\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"C. elegans UNC-31 (CAPS ortholog) is required for docking of dense-core vesicles at the plasma membrane; the docking defect in unc-31 mutants is fully rescued by PKA activation, placing UNC-31 upstream of or parallel to a PKA-regulated pathway in DCV docking.\",\n      \"method\": \"Electrophysiology (membrane capacitance, amperometry), TIRF microscopy of single DCV docking/fusion, genetic epistasis with PKA activation\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct single-vesicle imaging, electrophysiology, and epistasis in same study\",\n      \"pmids\": [\"18031683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Tomosyn (TOM-1) genetically antagonizes UNC-31 (CAPS) in C. elegans DCV exocytosis; loss of TOM-1 suppresses behavioral, electrophysiological, and DCV ultrastructural phenotypes of unc-31 mutants, establishing TOM-1 as a negative regulator acting in the same pathway as UNC-31 for DCV release.\",\n      \"method\": \"Genetic epistasis (double mutant analysis), electrophysiology, electron microscopy, behavioral assays\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal genetic epistasis with multiple orthogonal readouts\",\n      \"pmids\": [\"17881523\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CAPS2 knockout mice are glucose intolerant due to reduced glucose-induced insulin secretion; loss of CAPS2 reduces the morphologically docked pool, the readily releasable pool, and slows granule priming in pancreatic beta cells, while CAPS1 heterozygosity combined with CAPS2 knockout further reduces insulin granule stability and increases lysosomal degradation.\",\n      \"method\": \"Knockout mouse analysis, glucose tolerance testing, patch-clamp capacitance measurements, electron microscopy, insulin secretion assays\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in KO mouse with specific cellular and physiological readouts\",\n      \"pmids\": [\"18177725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CAPS drives trans-SNARE complex formation and membrane fusion in a reconstituted SNARE-dependent liposome fusion assay; CAPS stimulation requires PI(4,5)P2 in acceptor liposomes; Ca2+ dependence is restored by synaptotagmin; CAPS binds syntaxin-1, and truncations blocking syntaxin-1 binding inhibit CAPS-dependent fusion.\",\n      \"method\": \"Reconstituted liposome fusion assay, Co-IP/pulldown of syntaxin-1, truncation analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with mutagenesis/truncation and mechanistic validation\",\n      \"pmids\": [\"19805029\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CAPS exhibits high-affinity binding to syntaxin-1 and SNAP-25 and moderate-affinity binding to VAMP-2 via interactions with SNARE motifs; binding is specific for membrane-integrated exocytic SNARE isoforms; the CAPS binding site on syntaxin-1 is C-terminal and does not overlap with the Munc18-1 binding site, allowing co-residence; C-terminal syntaxin-1 mutants impair CAPS-dependent liposome fusion.\",\n      \"method\": \"Liposome cosedimentation, co-immunoprecipitation, truncation/mutagenesis, liposome fusion assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple binding and functional assays with mutational validation\",\n      \"pmids\": [\"20826818\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CAPS1 interacts specifically with GDP-bound class II ARF GTPases (ARF4/ARF5) via its pleckstrin homology (PH) domain; this interaction recruits ARF4/ARF5 to the Golgi and is required for DCV trafficking through the trans-Golgi network, as knockdown of CAPS1 or expression of CAPS1-binding-deficient ARF5 mutants causes chromogranin accumulation in the Golgi and reduces DCV secretion.\",\n      \"method\": \"Co-immunoprecipitation (anti-CAPS1 antibody pulldown of Golgi membrane fractions), knockdown (siRNA), overexpression of ARF5 binding-deficient mutants, chromogranin secretion assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP, knockdown, and dominant-negative mutant with specific organelle and secretion readouts\",\n      \"pmids\": [\"20921225\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The Munc13 homology domain-1 (MHD1) of CAPS is the core SNARE-binding domain; a CAPS mutant lacking a single helix in MHD1 cannot bind SNARE proteins and fails to support Ca2+-triggered exocytosis of either docked or newly arrived dense-core vesicles in cells, demonstrating that SNARE binding via MHD1 is essential for CAPS priming function.\",\n      \"method\": \"Domain truncation and mutagenesis, SNARE binding assay, Ca2+-triggered exocytosis assay in neuroendocrine cells\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — structure-function mutagenesis with both biochemical and cellular functional readouts\",\n      \"pmids\": [\"21803295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Conditional knockout of CAPS1 in the forebrain causes reduced numbers of presynaptic DCVs and dilated trans-Golgi cisternae; in the cerebellum, CAPS1 loss decreases DCV numbers at climbing fiber synapses and reduces EPSC amplitude while increasing paired-pulse depression, indicating reduced presynaptic release probability and disrupted TGN-DCV trafficking.\",\n      \"method\": \"Conditional knockout mouse (forebrain and cerebellum specific), electron microscopy, immunohistochemistry, electrophysiology (EPSC recording)\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with ultrastructural, biochemical, and electrophysiological readouts\",\n      \"pmids\": [\"24174665\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CAPS is a resident protein on dense-core vesicles that accompanies vesicles to the plasma membrane and is present at all single-vesicle exocytic events in PC12 cells; CAPS knockdown eliminates VAMP-2-dependent vesicle docking and evoked exocytosis; a CAPS mutant lacking vesicle localization (CAPS ΔC135) fails to rescue docking or exocytosis, demonstrating that vesicle-resident CAPS promotes both docking and fusion competence.\",\n      \"method\": \"TIRF microscopy of single-vesicle fusion events, shRNA knockdown, domain truncation rescue experiments, fluorescence imaging in live PC12 cells\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — live single-vesicle imaging with KD and structure-function rescue\",\n      \"pmids\": [\"26700319\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"A-to-I RNA editing of CAPS1 pre-mRNA converts glutamate to glycine in its C-terminal region; mice expressing only edited CAPS1 show increased DCV exocytosis in chromaffin cells and neurons; edited CAPS1 preferentially binds the activated (open) form of syntaxin-1A, providing a molecular basis for enhanced exocytosis.\",\n      \"method\": \"Knock-in mouse expressing only edited CAPS1, electrophysiology, co-immunoprecipitation with syntaxin-1A forms\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — knock-in mouse with electrophysiology and binding assay; multiple orthogonal methods\",\n      \"pmids\": [\"27851964\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CAPS-1 requires its C2, PH, MHD1 and DCV-localization domains for DCV exocytosis in mouse hippocampal neurons; C2 (K428E or G476E) or PH (R558D/K560E/K561E) mutations reduce rescue of DCV exocytosis to ~20% of wild-type; the C-terminus regulates synaptic enrichment of CAPS-1; DCV exocytosis is more severely impaired than SV exocytosis (96% vs 39%) in CAPS-1/-2 double knockout neurons.\",\n      \"method\": \"Domain mutant rescue in CAPS-1/-2 double knockout mouse neurons, TIRF/confocal live imaging, fluorescent DCV reporter (NPY-Venus)\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — systematic domain mutagenesis rescue in null background with defined cellular readouts\",\n      \"pmids\": [\"28883501\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CAPS1 promotes colorectal cancer cell migration and invasion and liver metastasis in vivo through a PI3K/Akt/GSK3β/Snail signaling pathway leading to EMT; CAPS1 binds Septin2 and the p85 subunit of PI3K; PI3K inhibitors abolish CAPS1-induced Akt/GSK3β activation and Snail upregulation; Snail knockdown reverses CAPS1-induced EMT.\",\n      \"method\": \"Co-immunoprecipitation (CAPS1 with Septin2 and p85-PI3K), overexpression and knockdown, in vitro migration/invasion assays, in vivo liver metastasis model, PI3K inhibitor treatment\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP with downstream pathway validation; single lab, novel non-canonical function\",\n      \"pmids\": [\"30742066\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CADPS (CAPS1) is a multi-domain neural/endocrine protein that resides on dense-core vesicles and functions as a priming factor for Ca2+-triggered DCV exocytosis by binding PtdIns(4,5)P2 at the plasma membrane, directly interacting with all three SNARE proteins (syntaxin-1, SNAP-25, VAMP-2) through its MHD1 domain to promote trans-SNARE complex assembly, and engaging ARF4/ARF5 via its PH domain to regulate DCV trafficking through the trans-Golgi network; RNA editing of CAPS1 modulates its affinity for activated syntaxin-1A to tune exocytosis, and CAPS vesicle residency is essential for its docking and fusion-priming activities.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll systematically classify each paper, then extract discoveries only from KEEP papers.\n\n**Classification:**\n\nKEEP papers (about canonical CADPS/CAPS protein):\n- [13] Drosophila CAPS (dCAPS) - ortholog, consistent function\n- [18] CAPS specific binding to PI(4,5)P2\n- [23] CAPS role in rapid DCV exocytosis\n- [31] Cloning/characterization of human CADPS and CADPS2\n- [32] CAPS drives trans-SNARE complex formation\n- [33] UNC-31 (C. elegans CAPS ortholog) in DCV docking\n- [38] CAPS1/CAPS2 in insulin granule stability\n- [40] Differential distributions CAPS1/CAPS2 in mouse brain\n- [43] Tomosyn negatively regulates CAPS-dependent peptide release\n- [47] Novel interactions of CAPS with neuronal SNARE proteins\n- [50] MHD1 in CAPS mediates SNARE binding\n- [53] Resident CAPS on DCVs docks and primes vesicles\n- [57] CAPS1 interacts with ARF4/ARF5 for DCV trafficking in TGN\n- [58] CAPS1 promotes CRC metastasis via PI3K/Akt/Snail\n- [63] CAPS1 RNA editing promotes DCV exocytosis\n- [65] Exosomes from CAPS1-overexpressing CRC cells promote migration\n- [77] Tissue distribution CAPS1/CAPS2 in mice\n- [79] CAPS-1 domains required for DCV exocytosis in CNS neurons\n- [80] CAPS1 deficiency perturbs DCV trafficking/Golgi\n- [82] Review: CAPS docking/priming\n- [95] Role of CAPS in DCV exocytosis (tissue distribution)\n\nFrom curated list:\n- [15] Novel 145 kd brain cytosolic protein (p145/CAPS) - foundational\n- [17] Novel Ca2+-binding protein CAPS related to UNC-31\n- [18] CAPS localizes to membranes for DCV exocytosis\n- [22] Family of Ca2+-dependent activator proteins (CAPS1/CAPS2)\n- [27] PKC stimulation of Ca2+-dependent secretion via p145/CAPS\n- [30] D2 dopamine receptor interaction with CAPS1\n- [15_unc31] UNC-31 affects nervous system functions (C. elegans)\n\nEXCLUDE: all others (NLRP3/CAPS disease, mRNA caps, actin caps, plant markers, etc.)\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1992,\n      \"finding\": \"A novel 145 kDa brain cytosolic protein (p145, later named CAPS) was identified as the cytosolic factor that reconstitutes Ca2+-activated dense-core vesicle (DCV) exocytosis in permeable neuroendocrine (PC12) cells. The protein forms dimers, exhibits Ca2+-dependent interaction with hydrophobic matrices, and binds phospholipid vesicles, indicating a membrane-associated function. A p145-specific antibody inhibits Ca2+-activated secretion, demonstrating an essential role.\",\n      \"method\": \"Biochemical reconstitution of Ca2+-dependent secretion in permeabilized PC12 cells; antibody inhibition; phospholipid binding assay\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution in permeable cells, antibody inhibition, multiple orthogonal biochemical assays in foundational paper\",\n      \"pmids\": [\"1516133\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"PKC stimulation of Ca2+-dependent norepinephrine secretion from semi-intact PC12 cells requires the presence of p145 (CAPS). PKC phosphorylates p145 under conditions of fully reconstituted Ca2+-activated secretion, suggesting that PKC's stimulatory effect on exocytosis is mediated largely through p145/CAPS phosphorylation.\",\n      \"method\": \"PKC-deficient semi-intact PC12 cell reconstitution assay; phosphorylation analysis of p145 with purified PKC\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — cell-based reconstitution with defined components, single lab\",\n      \"pmids\": [\"1429734\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"The C. elegans gene unc-31 (ortholog of CADPS/CAPS) affects multiple nervous system-controlled functions including locomotion, feeding, egg-laying, and dauer larvae recovery, establishing an early genetic requirement for UNC-31 in neurosecretion in vivo.\",\n      \"method\": \"Forward genetic screen; behavioral phenotyping of loss-of-function mutants in C. elegans\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean loss-of-function genetics with multiple defined phenotypes, ortholog confirmed\",\n      \"pmids\": [\"8325482\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Rat CAPS cDNA was cloned and the protein was identified as the vertebrate homologue of C. elegans UNC-31. Recombinant CAPS reconstitutes the Ca2+-dependent triggering step (but not the ATP-dependent priming step) in permeable PC12 cells. CAPS binds Ca2+ with moderate affinity (Kd ~270 µM, 2 mol Ca2+/mol dimer), consistent with a role at a Ca2+-regulated step in exocytosis.\",\n      \"method\": \"cDNA cloning; recombinant protein reconstitution of Ca2+-triggered exocytosis in permeable PC12 cells; Ca2+-binding assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — recombinant protein reconstitution plus Ca2+-binding biochemistry in foundational cloning paper\",\n      \"pmids\": [\"9289490\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"CAPS localizes as a peripherally membrane-associated protein to the plasma membrane and to dense-core vesicles (DCVs) but not to small clear synaptic vesicles (SVs) in brain homogenates. CAPS exhibits high-affinity, saturable binding to DCVs via bilayer phospholipids. CAPS antibodies inhibit Ca2+-activated norepinephrine release from lysed synaptosomes, indicating membrane-bound CAPS is essential for neural DCV exocytosis.\",\n      \"method\": \"Subcellular fractionation; DCV binding assay; antibody inhibition of norepinephrine release from synaptosomes\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal localization by fractionation, DCV binding assay, and functional antibody inhibition; multiple orthogonal methods\",\n      \"pmids\": [\"9697858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"CAPS specifically binds phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2] but not other phosphoinositides (including PI(3,4)P2 and PI(3,4,5)P3). PI(4,5)P2 binding promotes a conformational change in CAPS (altered protease susceptibility) and involves a hydrophobic interaction demonstrated by photoaffinity labeling. CAPS is proposed to function as a PI(4,5)P2 effector in regulated exocytosis.\",\n      \"method\": \"Liposome binding assay; limited proteolysis; photoaffinity labeling with PI(4,5)P2 analog\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple in vitro biochemical methods (liposome binding, proteolysis, photoaffinity labeling) with specificity controls\",\n      \"pmids\": [\"9525942\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"CAPS is required specifically for the rapid, high-Ca2+-sensitivity component of dense-core vesicle exocytosis in rat melanotrophs. Anti-CAPS antibody abolishes the rapid (but not the slow) capacitance component evoked by flash photolysis of caged Ca2+. Both components require SNARE-dependent fusion (blocked by BoNT/B and BoNT/E). Immunocytochemistry shows CAPS is present on only a subset of DCVs, defining two parallel DCV exocytosis pathways.\",\n      \"method\": \"Patch-clamp membrane capacitance measurement; flash photolysis of caged Ca2+; CAPS antibody injection; botulinum neurotoxin treatment; immunocytochemistry in rat melanotrophs\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct electrophysiological assay with antibody perturbation, neurotoxin controls, and immunolocalization; multiple orthogonal methods\",\n      \"pmids\": [\"10792045\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Drosophila CAPS (dCAPS) is essential for dense-core vesicle (DCV) release and modulates synaptic vesicle fusion. Null dCAPS mutants show embryonic lethality, 50% reduction in evoked glutamatergic transmission, accumulation of synaptic vesicles at active zones, and a 3-fold accumulation of DCVs in synaptic terminals. Cell-autonomous transgenic rescue in motoneurons fails to restore neurotransmission, revealing a cell-nonautonomous role in synaptic vesicle fusion.\",\n      \"method\": \"Genetic null mutants; electrophysiology at NMJ; electron microscopy of synaptic terminals; targeted transgenic rescue\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean null mutants with electrophysiology, EM, and rescue experiments; multiple orthogonal approaches\",\n      \"pmids\": [\"11516399\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"CAPS1 protein localizes exclusively to neural and endocrine tissues including adrenal medulla, pancreatic islets, anterior pituitary, thyroid parafollicular C cells, GI G cells, renal juxtaglomerular cells, and CNS gray matter, consistent with a widespread role in regulated DCV exocytosis in the nervous and endocrine systems.\",\n      \"method\": \"Immunohistochemistry of multiple tissue types\",\n      \"journal\": \"Annals of the New York Academy of Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — immunolocalization across tissues, single method\",\n      \"pmids\": [\"12438120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Human CADPS and CADPS2 were cloned and characterized as homologs of mouse Cadps. Both proteins contain a C2 domain implicated in calcium and phospholipid interactions. CADPS expression is restricted to neural and endocrine tissues, while CADPS2 is expressed ubiquitously, suggesting CADPS functions as a calcium sensor in regulated exocytosis and CADPS2 in constitutive vesicle trafficking.\",\n      \"method\": \"Full-length cDNA cloning; domain analysis (C2 domain identification); Northern/RT-PCR expression profiling; mutation screening\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — cloning and domain identification with expression analysis; no direct functional reconstitution of human protein\",\n      \"pmids\": [\"12659812\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"CAPS2 (the second mammalian CAPS isoform) was cloned and found to functionally rescue LDCV exocytosis from PC12 cells similarly to CAPS1. Both isoforms localize to synaptic cytosol fractions and vesicular fractions in brain. CAPS1 is enriched specifically in glutamatergic nerve terminals by ultrastructural analysis. CAPS2 is expressed in lung, liver, and testis in addition to brain, unlike the brain/neuroendocrine-restricted CAPS1.\",\n      \"method\": \"cDNA cloning; PC12 cell exocytosis reconstitution; subcellular fractionation of brain; immunoelectron microscopy\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — functional reconstitution combined with subcellular fractionation and immunoelectron microscopy\",\n      \"pmids\": [\"14530279\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"CAPS1 was identified as a D2 dopamine receptor interacting protein (DRIP) in a yeast two-hybrid screen. The interaction was confirmed by pulldown and co-immunoprecipitation. The D2 receptor binding site was mapped to the C-terminal region of CAPS1. In PC12 cells, CAPS1 and D2 receptors colocalize in cytosolic and plasma membrane compartments. Overexpression of a truncated D2 receptor fragment specifically reduces K+-evoked dopamine (but not norepinephrine or BDNF) release, suggesting D2 receptors modulate dopamine vesicle release via direct interaction with CAPS.\",\n      \"method\": \"Yeast two-hybrid screen; pulldown; co-immunoprecipitation; deletion mapping; immunofluorescence colocalization; dopamine release assay in PC12 cells\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Y2H confirmed by reciprocal Co-IP and pulldown, plus functional rescue; single lab\",\n      \"pmids\": [\"15857609\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CAPS1 and CAPS2 show complementary expression in the embryonic nervous system and distinct distributions in the postnatal brain. CAPS2 distribution patterns coincide with BDNF in multiple brain regions, and CAPS2 immunolabels colocalize with exocytosis-related proteins (VAMP, SNAP-25) and endocytosis-related dynamin I in cell soma and processes, suggesting CAPS2 is involved in BDNF secretion in many brain areas.\",\n      \"method\": \"Immunohistochemistry; double-label immunofluorescence colocalization in mouse brain sections\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — immunohistochemical colocalization across brain regions, multiple markers; strong correlation but indirect\",\n      \"pmids\": [\"16506193\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"UNC-31 (C. elegans CAPS ortholog) is required for docking of dense-core vesicles (DCVs) at the plasma membrane, as demonstrated by TIRF microscopy of single DCV fusion events. The DCV docking defect in unc-31 mutants is fully rescued by PKA activation. UNC-31 is also required for UNC-13-mediated augmentation of DCV exocytosis.\",\n      \"method\": \"Membrane capacitance measurement; amperometry; TIRF microscopy of single DCV docking/fusion in cultured C. elegans neurons; mutant epistasis analysis\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct single-vesicle imaging combined with electrophysiology and epistasis; multiple orthogonal methods\",\n      \"pmids\": [\"18031683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Tomosyn (TOM-1) negatively regulates UNC-31 (CAPS)-dependent dense-core vesicle exocytosis in C. elegans. Loss of TOM-1 suppresses the DCV accumulation, electrophysiological defects, and behavioral phenotypes of unc-31 mutants. Double mutant analysis distinguishes direct effects on DCV release from secondary effects via altered synaptic vesicle release.\",\n      \"method\": \"Genetic epistasis (tom-1;unc-31 double mutants); electron microscopy; electrophysiology; behavioral assays in C. elegans\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic epistasis with EM, electrophysiology, and behavioral validation; multiple orthogonal approaches\",\n      \"pmids\": [\"17881523\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CAPS2-/- and CAPS1+/-;CAPS2-/- mice are glucose intolerant due to reduced glucose-induced insulin secretion, correlating with diminished Ca2+-dependent exocytosis, reduced morphologically docked vesicle pool, decreased readily releasable pool, slowed granule priming, and suppressed second-phase insulin secretion. CAPS1+/-;CAPS2-/- beta cells show reduced insulin content and granule numbers with increased lysosome activity, indicating CAPS proteins regulate insulin granule priming, exocytosis, and stability.\",\n      \"method\": \"Knockout mouse phenotyping; glucose tolerance test; patch-clamp capacitance measurement; electron microscopy; lysosomal enzyme activity assay\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with multiple orthogonal physiological, electrophysiological, and ultrastructural readouts\",\n      \"pmids\": [\"18177725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CAPS drives trans-SNARE complex formation and membrane fusion in a reconstituted SNARE-dependent liposome fusion assay. CAPS stimulation requires PI(4,5)P2 in acceptor liposomes and is independent of Ca2+ alone, but Ca2+ dependence is restored by synaptotagmin. CAPS binds syntaxin-1, and truncations that competitively inhibit syntaxin-1 binding also inhibit CAPS-dependent fusion, establishing CAPS as a priming protein that accelerates fusion by promoting trans-SNARE complex assembly.\",\n      \"method\": \"Reconstituted SNARE-dependent liposome fusion assay; CAPS truncation analysis; syntaxin-1 binding assay; PI(4,5)P2 requirement assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — fully reconstituted in vitro fusion assay with mutagenesis/truncation analysis; strong mechanistic evidence\",\n      \"pmids\": [\"19805029\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CAPS exhibits high-affinity binding to syntaxin-1 and SNAP-25 and moderate affinity binding to VAMP-2. CAPS binding is specific for exocytic SNARE isoforms and requires membrane integration of SNARE proteins. CAPS binding to syntaxin-1 is mediated by SNARE motifs and occurs at a C-terminal site that does not overlap the Munc18-1 binding site, allowing CAPS and Munc18-1 to co-reside on membrane-integrated syntaxin-1.\",\n      \"method\": \"Liposome co-sedimentation; binding affinity measurements; SNARE isoform specificity assays; CAPS-stimulated liposome fusion with syntaxin-1 truncation mutants\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro binding with multiple SNARE proteins, isoform specificity controls, and functional fusion assay with mutants\",\n      \"pmids\": [\"20826818\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CAPS1 interacts specifically with class II ARF GTPases (ARF4 and ARF5) but not other ARF classes, via its pleckstrin homology (PH) domain in a GDP-bound form-specific manner. The PH domain recruits ARF4/ARF5 to the Golgi complex. Knockdown of CAPS1 or ARF4/ARF5 causes accumulation of chromogranin (DCV marker) in the Golgi and reduces DCV secretion. CAPS1-binding-deficient ARF5 mutants phenocopy this DCV trafficking defect, establishing a role for somal CAPS1 in TGN-to-DCV trafficking.\",\n      \"method\": \"Co-immunoprecipitation; GST pulldown; yeast two-hybrid; siRNA knockdown; Golgi localization by immunofluorescence; chromogranin secretion assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP confirmed by pulldown and Y2H; GDP-specificity biochemistry; functional rescue with binding-deficient mutants\",\n      \"pmids\": [\"20921225\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The Munc13 homology domain-1 (MHD1) of CAPS was identified as the core SNARE-binding domain. CAPS lacking a single helix in MHD1 fails to bind SNARE proteins and cannot support Ca2+-triggered exocytosis of either docked or newly arrived dense-core vesicles in PC12 cells, demonstrating that SNARE protein binding via MHD1 is essential for CAPS function in DCV exocytosis.\",\n      \"method\": \"Domain deletion/mutation analysis; SNARE binding assay; Ca2+-triggered DCV exocytosis assay in PC12 cells\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structure-function mutagenesis linking specific domain to SNARE binding and functional exocytosis\",\n      \"pmids\": [\"21803295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Conditional knockout of CAPS1 in forebrain causes reduced DCV marker (secretogranin II) immunoreactivity, reduced presynaptic DCV numbers, dilated trans-Golgi cisternae, and reduced TGN marker syntaxin-6, establishing CAPS1's role in TGN-to-DCV trafficking. Cerebellar-specific CAPS1 cKO reduces BDNF along climbing fibers and decreases DCV numbers at climbing fiber synapses, impairing synaptic transmission by reducing presynaptic release probability.\",\n      \"method\": \"Conditional knockout mice; immunohistochemistry; electron microscopy; electrophysiology (EPSC amplitude and paired-pulse depression) at climbing fiber–Purkinje cell synapses\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with EM, immunohistochemistry, and in vivo electrophysiology; multiple orthogonal readouts\",\n      \"pmids\": [\"24174665\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CAPS resides on dense-core vesicles (DCVs) as a resident protein and is present in clusters (~9 molecules) near the plasma membrane at sites of vesicle docking. CAPS accompanies vesicles to the plasma membrane and is present at all exocytic events imaged by TIRF microscopy. shRNA knockdown of CAPS eliminates VAMP-2-dependent vesicle docking and evoked exocytosis. A CAPS mutant that does not localize to vesicles (CAPS ΔC135) fails to rescue docking or exocytosis, establishing that CAPS residence on vesicles is essential for docking and fusion competence.\",\n      \"method\": \"TIRF microscopy of single-vesicle fusion events in live PC12 cells; shRNA knockdown; CAPS truncation mutant rescue experiments\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — live single-vesicle imaging combined with KD and structure-function rescue; multiple orthogonal approaches\",\n      \"pmids\": [\"26700319\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CAPS1 pre-mRNA undergoes adenosine-to-inosine RNA editing resulting in a glutamate-to-glycine conversion in its C-terminal region. Mice expressing only edited CAPS1 show increased DCV exocytosis in chromaffin cells and neurons, and edited CAPS1 preferentially binds the activated (open) conformation of syntaxin-1A. This demonstrates that A-to-I RNA editing of CAPS1 modulates DCV exocytosis by altering its interaction with the exocytotic SNARE machinery.\",\n      \"method\": \"RNA editing knock-in mice; electrophysiological DCV exocytosis assay in chromaffin cells; co-immunoprecipitation of CAPS1 with syntaxin-1A conformational mutants\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — knock-in mouse model with electrophysiology and direct biochemical binding assay; multiple orthogonal methods\",\n      \"pmids\": [\"27851964\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CAPS-1 requires its C2, pleckstrin homology (PH), MHD1, and DCV-binding domains for DCV exocytosis in mammalian hippocampal neurons. Mutations in C2 (K428E or G476E) or PH (R558D/K560E/K561E) domains do not affect synaptic enrichment of CAPS-1, but all mutants rescue DCV exocytosis to only ~20% of wild-type capacity. Truncation of the C-terminus impairs synaptic enrichment. CAPS deficiency impairs DCV exocytosis more severely (96% inhibition) than SV exocytosis (39% inhibition).\",\n      \"method\": \"CAPS-1/-2 double knockout mouse hippocampal neurons; domain mutation rescue assay; DCV exocytosis imaging; SV exocytosis electrophysiology\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — systematic domain mutagenesis rescue in null neurons with multiple functional readouts\",\n      \"pmids\": [\"28883501\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CAPS1 is upregulated in colorectal cancer and promotes cancer cell migration, invasion, and liver metastasis in vivo without affecting proliferation. CAPS1 induces epithelial-mesenchymal transition (EMT) by decreasing E-cadherin/ZO-1 and increasing N-cadherin/Snail. Snail knockdown reverses CAPS1-induced EMT. CAPS1 binds Septin2 and p85 (PI3K subunit), and PI3K/Akt inhibitors abolish CAPS1-induced Akt/GSK3β activity and Snail upregulation, placing CAPS1 in a PI3K/Akt/GSK3β/Snail signaling axis for metastasis.\",\n      \"method\": \"Overexpression and knockdown in CRC cell lines; in vivo liver metastasis model; co-immunoprecipitation of CAPS1 with Septin2 and p85; PI3K inhibitor treatment; EMT marker immunoblotting\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — Co-IP binding partners, pharmacological pathway inhibition, in vivo model; single lab\",\n      \"pmids\": [\"30742066\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CADPS (CAPS1) is a multi-domain neural/endocrine protein that resides on dense-core vesicles (DCVs) and at the plasma membrane, where it promotes vesicle docking and priming by directly binding all three neuronal SNARE proteins (syntaxin-1, SNAP-25, VAMP-2) via its MHD1 domain, driving trans-SNARE complex assembly in a PI(4,5)P2-dependent manner; it also facilitates DCV trafficking from the trans-Golgi network via interaction with ARF4/ARF5 GTPases through its PH domain, and its activity is modulated by A-to-I RNA editing (altering syntaxin-1A binding preference), PKA/PKC phosphorylation, and interaction with the D2 dopamine receptor.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CADPS (CAPS1) is a multi-domain priming factor essential for Ca²⁺-triggered dense-core vesicle (DCV) exocytosis in neural and endocrine cells. As a vesicle-resident protein, CAPS1 promotes DCV docking and fusion competence by binding PtdIns(4,5)P₂ at the plasma membrane and directly engaging all three exocytic SNAREs (syntaxin-1, SNAP-25, VAMP-2) through its MHD1 domain to drive trans-SNARE complex assembly, with its C2 and PH domains additionally required for full activity [PMID:9525942, PMID:19805029, PMID:20826818, PMID:21803295, PMID:26700319, PMID:28883501]. Beyond its plasma-membrane role, CAPS1 interacts with GDP-bound ARF4/ARF5 via its PH domain to regulate DCV biogenesis and trafficking through the trans-Golgi network, and conditional knockout causes DCV depletion and dilated TGN cisternae [PMID:20921225, PMID:24174665]. A-to-I RNA editing of CAPS1 pre-mRNA modulates its binding preference for the open conformation of syntaxin-1A, providing a post-transcriptional mechanism to tune exocytotic output [PMID:27851964].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Establishing that CAPS functions as a phosphoinositide effector resolved what lipid signal CAPS recognizes at the plasma membrane during exocytosis.\",\n      \"evidence\": \"Liposome binding assays, limited proteolysis, and photoaffinity labeling demonstrated selective PtdIns(4,5)P₂ binding and conformational change in vitro\",\n      \"pmids\": [\"9525942\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding site residues not mapped\", \"Functional consequence of PtdIns(4,5)P₂ binding on exocytosis not tested in cells\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Antibody-inhibition experiments in melanotrophs demonstrated that CAPS acts at a late, Ca²⁺-sensitive step of DCV exocytosis rather than globally, establishing its stage specificity.\",\n      \"evidence\": \"Patch-clamp capacitance with flash photolysis of caged Ca²⁺ and anti-CAPS antibody infusion in rat melanotrophs\",\n      \"pmids\": [\"10792045\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular target of CAPS at this late step unknown\", \"Antibody inhibition does not distinguish docking from fusion\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Genetic loss-of-function in Drosophila confirmed an in vivo requirement for CAPS in DCV release and revealed an additional effect on synaptic vesicle-mediated transmission.\",\n      \"evidence\": \"Drosophila null mutant analysis with electron microscopy, electrophysiology, and transgenic rescue\",\n      \"pmids\": [\"11516399\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of SV transmission effect unclear—direct or indirect via neuropeptide signaling\", \"Cell-nonautonomous component not molecularly explained\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identification of UNC-31/CAPS as a DCV docking factor upstream of PKA, and genetic antagonism with tomosyn, positioned CAPS within the regulatory hierarchy controlling vesicle competence.\",\n      \"evidence\": \"C. elegans TIRF imaging, electrophysiology, and epistasis with PKA activation (unc-31) and double-mutant analysis with tom-1\",\n      \"pmids\": [\"18031683\", \"17881523\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical interaction between UNC-31 and tomosyn not shown\", \"Whether PKA phosphorylates CAPS directly remains untested\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"CAPS2 knockout mice revealed that CAPS family members have partially redundant roles in insulin granule priming and docking, extending CAPS function beyond neurons to pancreatic β-cells.\",\n      \"evidence\": \"CAPS2 knockout and CAPS1-heterozygous/CAPS2-KO mice assessed by glucose tolerance, patch-clamp capacitance, and electron microscopy\",\n      \"pmids\": [\"18177725\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contributions of CAPS1 vs CAPS2 in β-cells not fully delineated\", \"Whether CAPS1 can fully compensate for CAPS2 not tested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Reconstituted liposome fusion demonstrated that CAPS directly promotes trans-SNARE complex assembly in a PtdIns(4,5)P₂-dependent manner, resolving its core biochemical activity.\",\n      \"evidence\": \"SNARE-reconstituted liposome fusion assay with CAPS addition, syntaxin-1 pulldowns, and truncation analysis\",\n      \"pmids\": [\"19805029\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise domain mediating SNARE binding not yet identified\", \"Stoichiometry of CAPS–SNARE interactions unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Mapping CAPS binding to all three SNARE proteins via their SNARE motifs, and identifying ARF4/ARF5 interaction via the PH domain, revealed dual roles in fusion priming and Golgi-to-DCV trafficking.\",\n      \"evidence\": \"Liposome cosedimentation, co-IP, mutagenesis of syntaxin-1 C-terminal region; co-IP of ARF4/ARF5, siRNA knockdown, and ARF5 mutant expression in neuroendocrine cells\",\n      \"pmids\": [\"20826818\", \"20921225\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for simultaneous engagement of three SNAREs not resolved\", \"Whether ARF4 and ARF5 are redundant or non-redundant partners unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identification of MHD1 as the minimal SNARE-binding domain essential for CAPS priming function pinpointed the functional core shared with Munc13 family proteins.\",\n      \"evidence\": \"MHD1 helix deletion/mutagenesis with SNARE binding assays and Ca²⁺-triggered exocytosis rescue in neuroendocrine cells\",\n      \"pmids\": [\"21803295\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"High-resolution structure of MHD1–SNARE complex not determined\", \"Functional overlap versus distinction with Munc13 MHD1 not clarified\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Conditional knockout of CAPS1 in the brain confirmed in vivo requirements for DCV biogenesis at the TGN and presynaptic release probability, linking ultrastructural and electrophysiological phenotypes.\",\n      \"evidence\": \"Forebrain and cerebellum conditional knockout mice with electron microscopy, immunohistochemistry, and EPSC recordings\",\n      \"pmids\": [\"24174665\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TGN phenotype reflects the ARF4/5-dependent trafficking function not tested\", \"Synaptic vesicle release effect not mechanistically separated from DCV deficiency\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Single-vesicle imaging established that CAPS is a bona fide vesicle-resident protein whose presence on DCVs is required for both docking and fusion, ruling out a purely cytosolic mechanism.\",\n      \"evidence\": \"TIRF microscopy of single DCV events, shRNA knockdown, and rescue with vesicle-localization-deficient mutant (ΔC135) in PC12 cells\",\n      \"pmids\": [\"26700319\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Vesicle-targeting signal in the C-terminal 135 residues not mapped\", \"Whether vesicle association is constitutive or regulated unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"A knock-in mouse expressing only RNA-edited CAPS1 revealed that A-to-I editing tunes DCV exocytosis by altering CAPS1 affinity for open syntaxin-1A, establishing a post-transcriptional regulatory mechanism.\",\n      \"evidence\": \"Knock-in mouse with electrophysiology in chromaffin cells and neurons, co-IP with closed vs open syntaxin-1A\",\n      \"pmids\": [\"27851964\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Editing site structure not resolved\", \"Regulation of editing levels across brain regions or development not characterized\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Systematic domain mutagenesis in CAPS-1/-2 double knockout neurons established that C2, PH, MHD1, and vesicle-localization domains are each essential and that DCV exocytosis depends more critically on CAPS than synaptic vesicle release.\",\n      \"evidence\": \"Domain-mutant rescue in CAPS-1/-2 DKO hippocampal neurons with TIRF and confocal live imaging of NPY-Venus\",\n      \"pmids\": [\"28883501\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether domain requirements differ between neuronal subtypes not tested\", \"Cooperative versus sequential engagement of domains not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A high-resolution structure of CAPS1 in complex with SNAREs or PtdIns(4,5)P₂, the precise mechanism by which vesicle residency enables priming, and the physiological regulation of CAPS1 RNA editing remain open questions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No atomic structure of CAPS or CAPS–SNARE complex available\", \"Mechanism coupling vesicle binding to SNARE engagement unresolved\", \"Whether PKA directly phosphorylates CAPS to regulate docking is untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [0, 8]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [8, 9, 11, 13]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 6, 8, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [1, 2, 13, 15]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [10, 12]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 8, 13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [1, 2, 5, 8, 13, 15]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [2, 12, 14, 15]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [10, 12]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"STX1A\",\n      \"SNAP25\",\n      \"VAMP2\",\n      \"ARF4\",\n      \"ARF5\",\n      \"SEPT2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"CADPS (CAPS1) is a calcium-dependent activator of dense-core vesicle (DCV) exocytosis that functions as a vesicle-resident priming factor in neural and endocrine cells [PMID:1516133, PMID:9697858, PMID:12438120]. It drives trans-SNARE complex assembly by directly binding syntaxin-1, SNAP-25, and VAMP-2 through its Munc13-homology domain 1 (MHD1) in a PI(4,5)P2-dependent manner, thereby promoting vesicle docking and fusion competence [PMID:19805029, PMID:20826818, PMID:21803295, PMID:26700319]. CADPS also facilitates DCV biogenesis and trafficking from the trans-Golgi network through PH domain–mediated interaction with ARF4/ARF5 GTPases, and its activity is modulated by PKC phosphorylation, A-to-I RNA editing that alters syntaxin-1A binding preference, and interaction with D2 dopamine receptors [PMID:20921225, PMID:1429734, PMID:27851964, PMID:15857609]. Loss of CAPS proteins in pancreatic β-cells impairs insulin granule priming and glucose-stimulated insulin secretion, and CAPS orthologs are essential for neurosecretion-dependent behaviors in C. elegans and Drosophila [PMID:18177725, PMID:8325482, PMID:11516399].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"The identity of the cytosolic factor required for Ca²⁺-activated DCV exocytosis was unknown; purification of a 145-kDa brain protein (p145/CAPS) that reconstitutes secretion in permeable PC12 cells and whose antibody blocks release established CAPS as an essential exocytosis factor.\",\n      \"evidence\": \"Biochemical reconstitution and antibody inhibition in permeabilized PC12 cells\",\n      \"pmids\": [\"1516133\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular identity (cDNA) not yet known\", \"Mechanism of action on fusion machinery undefined\", \"In vivo relevance undemonstrated\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Whether CAPS function was conserved in vivo was untested; identification of C. elegans unc-31 as a CAPS ortholog whose loss causes pleiotropic neurosecretory defects established a conserved genetic requirement for CAPS in regulated secretion.\",\n      \"evidence\": \"Forward genetic screen and behavioral phenotyping in C. elegans unc-31 loss-of-function mutants\",\n      \"pmids\": [\"8325482\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism linking UNC-31 to exocytosis unknown\", \"Vertebrate in vivo function not yet tested\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Cloning of rat CAPS cDNA and demonstration that recombinant protein reconstitutes Ca²⁺-triggered (but not ATP-dependent priming) exocytosis placed CAPS at the Ca²⁺-dependent triggering step and revealed moderate-affinity Ca²⁺ binding.\",\n      \"evidence\": \"cDNA cloning; recombinant protein reconstitution in permeable PC12 cells; Ca²⁺-binding assay\",\n      \"pmids\": [\"9289490\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Subcellular localization unresolved\", \"Lipid-binding specificity untested\", \"SNARE interaction not yet demonstrated\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Two key questions—where CAPS acts and what lipid signals govern it—were resolved: CAPS localizes to DCVs and plasma membrane (not synaptic vesicles) and specifically binds PI(4,5)P2, which induces a conformational change, establishing CAPS as a PI(4,5)P2-effector on DCVs.\",\n      \"evidence\": \"Subcellular fractionation; liposome binding with phosphoinositide specificity controls; limited proteolysis and photoaffinity labeling\",\n      \"pmids\": [\"9697858\", \"9525942\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct SNARE interaction not demonstrated\", \"Role in vesicle docking vs. fusion not distinguished\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Whether CAPS participates in all or a subset of DCV fusion events was unclear; electrophysiological dissection in melanotrophs showed CAPS is required specifically for the rapid, high-Ca²⁺-sensitivity component of DCV exocytosis, defining a CAPS-dependent and a CAPS-independent DCV release pathway.\",\n      \"evidence\": \"Patch-clamp capacitance with flash photolysis of caged Ca²⁺; antibody injection; botulinum neurotoxin controls in rat melanotrophs\",\n      \"pmids\": [\"10792045\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of CAPS-independent pathway unknown\", \"Mechanism by which CAPS confers rapid kinetics unresolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Drosophila null mutants established that CAPS is essential for DCV release and contributes to synaptic vesicle fusion, with DCV accumulation in terminals confirming a role upstream of fusion.\",\n      \"evidence\": \"Genetic nulls with electrophysiology, electron microscopy, and transgenic rescue at Drosophila NMJ\",\n      \"pmids\": [\"11516399\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of effect on synaptic vesicle fusion unclear (cell-nonautonomous)\", \"Vertebrate knockout not yet available\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Single-vesicle imaging in C. elegans neurons revealed UNC-31/CAPS is required for DCV docking at the plasma membrane—a step upstream of fusion—and that this docking defect is bypassed by PKA activation, linking CAPS to PKA-dependent priming.\",\n      \"evidence\": \"TIRF microscopy of single DCV events; amperometry and capacitance in cultured C. elegans neurons; epistasis with unc-13\",\n      \"pmids\": [\"18031683\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical mechanism of docking promotion unknown\", \"PKA phosphorylation site on CAPS not mapped\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Vertebrate in vivo relevance was confirmed: CAPS2 knockout and CAPS1/2 compound mutant mice show glucose intolerance due to impaired insulin granule priming and exocytosis, establishing CAPS as essential for pancreatic β-cell function.\",\n      \"evidence\": \"Knockout mice; glucose tolerance tests; patch-clamp capacitance; electron microscopy; lysosomal enzyme assay in β-cells\",\n      \"pmids\": [\"18177725\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contributions of CAPS1 vs. CAPS2 in β-cells not fully resolved\", \"CAPS1 single-KO β-cell phenotype not reported\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"The central mechanistic question—how CAPS promotes fusion—was answered by reconstituted liposome assays showing CAPS drives trans-SNARE complex assembly in a PI(4,5)P2-dependent, syntaxin-1-binding-dependent manner, establishing it as a bona fide priming factor.\",\n      \"evidence\": \"Reconstituted SNARE-dependent liposome fusion assay with truncation analysis and PI(4,5)P2 requirement\",\n      \"pmids\": [\"19805029\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of CAPS–syntaxin interaction unresolved\", \"Relationship to Munc13-mediated priming not fully delineated\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"CAPS was shown to bind all three neuronal SNAREs (syntaxin-1, SNAP-25, VAMP-2) with isoform specificity and at a syntaxin-1 site distinct from Munc18-1, and separately to interact with ARF4/ARF5 via its PH domain to mediate TGN-to-DCV trafficking, revealing a dual function in vesicle biogenesis and priming.\",\n      \"evidence\": \"Liposome co-sedimentation for SNARE binding; Co-IP and pulldown for ARF4/ARF5; siRNA knockdown with chromogranin secretion assay\",\n      \"pmids\": [\"20826818\", \"20921225\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural model of CAPS–SNARE complex lacking\", \"How ARF-binding and SNARE-binding functions are coordinated in vivo is unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"The MHD1 domain was identified as the core SNARE-binding unit; a single-helix deletion abolishes both SNARE binding and exocytosis, pinpointing the minimal functional domain.\",\n      \"evidence\": \"Domain deletion/mutation analysis with SNARE binding and Ca²⁺-triggered exocytosis assays in PC12 cells\",\n      \"pmids\": [\"21803295\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic-resolution structure of MHD1–SNARE interface not determined\", \"Whether MHD1 opens closed syntaxin directly is unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Live single-vesicle imaging established that CAPS is a resident DCV protein present at all exocytic events, and that vesicle-localized CAPS (~9-molecule clusters) is essential for VAMP-2-dependent docking and fusion, resolving the question of whether CAPS acts from the vesicle or plasma membrane.\",\n      \"evidence\": \"TIRF microscopy of single DCV events in PC12 cells; shRNA knockdown; CAPS ΔC135 vesicle-targeting mutant rescue\",\n      \"pmids\": [\"26700319\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of CAPS recruitment to DCV membrane not defined\", \"Whether stoichiometry of ~9 molecules is functionally required is untested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"A-to-I RNA editing of CAPS1 was shown to enhance DCV exocytosis by shifting CAPS1 binding preference toward open syntaxin-1A, revealing a post-transcriptional regulatory mechanism that tunes secretory output.\",\n      \"evidence\": \"RNA editing knock-in mice; chromaffin cell electrophysiology; Co-IP with syntaxin-1A conformational mutants\",\n      \"pmids\": [\"27851964\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological contexts controlling editing levels are unknown\", \"Whether editing affects CAPS2 is untested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Systematic domain mutagenesis in CAPS-null hippocampal neurons confirmed that C2, PH, MHD1, and DCV-binding domains are each required for DCV exocytosis, and quantified a 96% inhibition of DCV exocytosis vs. 39% for SV exocytosis in the absence of CAPS.\",\n      \"evidence\": \"CAPS1/2 double-KO hippocampal neurons; domain mutation rescue; DCV exocytosis imaging and SV electrophysiology\",\n      \"pmids\": [\"28883501\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of partial SV exocytosis impairment not characterized\", \"Interdomain cooperativity not structurally resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A high-resolution structure of CAPS (full-length or MHD1–SNARE complex) is lacking, the mechanism by which CAPS cooperates with or is distinguished from Munc13 in priming remains incompletely defined, and how somatic TGN-trafficking and synaptic priming functions are spatiotemporally coordinated is unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No crystal or cryo-EM structure available\", \"Functional overlap with Munc13 not delineated at molecular level\", \"In vivo regulation of CAPS by PKA phosphorylation site not mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [5, 16, 23]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [16, 17, 19, 21]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [18, 19]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [4, 21]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [4, 11, 21]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 10]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [18, 20]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 4, 6, 13, 16, 21]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [2, 7, 13, 20, 23]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 11, 22]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"STX1A\",\n      \"SNAP25\",\n      \"VAMP2\",\n      \"ARF4\",\n      \"ARF5\",\n      \"DRD2\",\n      \"STXBP5\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}