{"gene":"RUFY3","run_date":"2026-04-28T20:42:06","timeline":{"discoveries":[{"year":2007,"finding":"RUFY3 (identified as Singar1/KIAA0871/RPIPx) is a RUN domain-containing protein predominantly expressed in the brain. It suppresses formation of surplus axons to ensure neuronal polarity: overexpression suppressed surplus axons induced by excess shootin1, while knockdown of singar1/singar2 by RNAi increased the population of neurons bearing surplus axons in a PI3K-dependent manner. Singar1 was found diffusely localized in hippocampal neurons with moderate accumulation in growth cones.","method":"Overexpression and RNAi knockdown in cultured hippocampal neurons; 2D electrophoresis-based proteomics for identification","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — clean KD/KO with defined cellular phenotype; single lab","pmids":["17439943"],"is_preprint":false},{"year":2014,"finding":"Rufy3 is a neuron-specific, actin filament-relevant protein that physically interacts with the actin-bundling protein Fascin (and Drebrin) and colocalizes with Fascin in growth cones. Knockdown of Rufy3 impaired Fascin and F-actin distribution, increased the proportion of multipolar neurons, and decreased axon length; overexpression led to longer axons and expanded Drebrin distribution throughout the growth cone.","method":"Co-immunoprecipitation, colocalization by immunofluorescence, RNAi knockdown and overexpression in mouse hippocampal neurons","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2/3 — reciprocal interaction evidence plus KD/OE phenotype; single lab","pmids":["24720729"],"is_preprint":false},{"year":2015,"finding":"PAK1 (P21-activated kinase-1) interacts with RUFY3 and promotes RUFY3 expression; RUFY3 overexpression drives formation of F-actin-enriched protrusive structures at the cell periphery and induces gastric cancer cell migration and invasion. Inhibition of PAK1 attenuates RUFY3-induced migration, and combined knockdown of PAK1 and RUFY3 shows an enhanced inhibitory effect on migration compared with knockdown of either alone.","method":"Co-immunoprecipitation, overexpression, shRNA knockdown, cell migration/invasion assays in gastric cancer cell lines","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2/3 — Co-IP plus functional KD/OE; single lab","pmids":["25766321"],"is_preprint":false},{"year":2017,"finding":"Rufy3 promotes EMT in colorectal cancer cells downstream of TGF-β1 (TGF-β1 induces Rufy3 expression in a dose-dependent manner); siRNA-mediated repression of Rufy3 induces G0/G1 cell cycle arrest and reverses EMT. Rufy3 overexpression enhances CRC cell proliferation in vitro and in vivo and promotes metastatic phenotypes.","method":"siRNA knockdown, overexpression, TGF-β1 stimulation, cell cycle analysis, in vivo xenograft/metastasis models","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 — KD/OE with defined cellular phenotype and upstream signal identified; single lab","pmids":["28089833"],"is_preprint":false},{"year":2017,"finding":"RUFY3 physically interacts with the transcription factor FOXK1 in colorectal cancer cells. siRNA-mediated repression of FOXK1 in RUFY3-overexpressing cells reverses EMT and metastatic phenotypes; in vivo, FOXK1 promotes RUFY3-mediated metastasis. A positive correlation exists between RUFY3 and FOXK1 expression.","method":"Co-immunoprecipitation, immunofluorescence, siRNA knockdown, orthotopic implantation in vivo","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 3 — Co-IP plus functional epistasis; single lab","pmids":["28623323"],"is_preprint":false},{"year":2017,"finding":"Rufy3 functions as an adapter protein for small GTPase Rap2 in developing neurons. It is recruited via glycoprotein M6A to detergent-resistant membrane (lipid raft-like) domains. As part of a ternary complex, Rufy3 induces assembly of Rap2 in the axonal growth cone and is required downstream of Rap2 for accumulation of the Rac-GEF Tiam2/STEF; Rufy3 knockout mice showed inhibited Tiam2/STEF localization and impaired neuronal polarity.","method":"Rufy3 knockout mouse generation, biochemical fractionation (DRM), co-immunoprecipitation, immunofluorescence in primary neurons","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — KO mouse plus biochemical fractionation, Co-IP, and epistasis; single lab with multiple orthogonal methods","pmids":["29089386"],"is_preprint":false},{"year":2019,"finding":"RUFY3 is essential for caspase-mediated axon degeneration in TRKA+ sensory neurons. Deletion of Rufy3 protects axons from degeneration even in the presence of activated CASP3 competent to cleave endogenous substrates. Dephosphorylation of RUFY3 at residue S34 appears required for axon degeneration, providing a mechanism for local caspase-driven degeneration control.","method":"Rufy3 deletion (in vitro and in vivo), mass spectrometry discovery, phosphorylation site mutagenesis (S34), CASP3 activity assays in sensory neurons","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1/2 — genetic deletion in vivo + in vitro, PTM mutagenesis, mass spectrometry; multiple orthogonal methods in single rigorous study","pmids":["31221560"],"is_preprint":false},{"year":2019,"finding":"HOXD9 directly binds the RUFY3 promoter (demonstrated by ChIP and luciferase assays) to transcriptionally activate RUFY3 expression, and this HOXD9-RUFY3 axis promotes proliferation, invasion, and migration of gastric cancer cells. Inhibition of RUFY3 attenuated the oncogenic effects of HOXD9 overexpression in vitro and in vivo.","method":"Chromatin immunoprecipitation (ChIP), luciferase reporter assay, RUFY3 knockdown, in vivo nude mouse xenograft/metastasis","journal":"Journal of experimental & clinical cancer research : CR","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP + luciferase + functional rescue; single lab","pmids":["31547840"],"is_preprint":false},{"year":2021,"finding":"RUFY3 promotes hepatocellular carcinoma progression through activation of NF-κB-mediated epithelial-mesenchymal transition. Knockdown of RUFY3 inhibited NF-κB signaling and reversed EMT, while RUFY3 overexpression activated NF-κB and enhanced HCC cell growth, invasion, and metastasis both in vitro and in vivo.","method":"shRNA knockdown, overexpression, NF-κB reporter assays, xenograft and lung metastasis mouse models","journal":"Aging","confidence":"Medium","confidence_rationale":"Tier 2 — KD/OE with pathway-level readout and in vivo validation; single lab","pmids":["34510031"],"is_preprint":false},{"year":2022,"finding":"RUFY3 is an effector of Arl8b that links Arl8b to the JIP4-dynein-dynactin retrograde motor complex to regulate lysosome retrograde transport. RUFY3 knockdown disrupts positioning of Arl8b-positive endosomes, reduces Arl8b colocalization with Rab7-marked late endosomes, impairs nutrient-dependent lysosome redistribution, and significantly reduces lysosome size (rescued by PIKFYVE inhibition). RUFY3 promotes perinuclear clustering of lysosomes.","method":"Co-immunoprecipitation, live-cell imaging, fluorescence colocalization, siRNA knockdown, pharmacological rescue (PIKFYVE inhibitor), organelle fractionation","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (Co-IP, live imaging, KD, pharmacological rescue); single lab with strong mechanistic evidence","pmids":["35314681"],"is_preprint":false},{"year":2022,"finding":"In a subarachnoid hemorrhage model, Rufy3 interacts with Rap1 and promotes Rap1-GTP loading. Rufy3 overexpression activates the Rap1/Arap3/Rho/Fascin pathway to inhibit axon injury and accelerate axon repair, and activates the Rap1/MEK/ERK/Synapsin I pathway to enhance synaptic plasticity. Rufy3 overexpression combined with a Rap1 agonist showed synergistic neuroprotective effects.","method":"Co-immunoprecipitation (Rufy3-Rap1), lentiviral overexpression/knockdown in rat SAH model, Rap1-GTP pull-down, western blot for pathway components, in vivo behavioral assays","journal":"Molecular brain","confidence":"Medium","confidence_rationale":"Tier 2/3 — Co-IP plus in vivo pathway analysis; single lab","pmids":["35461284"],"is_preprint":false},{"year":2023,"finding":"RUFY3 exists as two alternative isoforms: a FYVE domain-bearing isoform (iRUFY3) with affinity for phosphatidylinositol 3-phosphate on endosomal membranes (preferentially expressed in immune cells and upregulated by microbes/interferons) and an isoform lacking the FYVE domain. iRUFY3 is required for ARL8b+/LAMP1+ endo-lysosome positioning in the pericentriolar cloud of LPS-activated macrophages, and controls macrophage migration, MHC II antigen presentation, and responses to IFN-γ. Phagocyte-specific Rufy3 inactivation aggravated LPS-induced pathology and bacterial pneumonia in mice.","method":"Isoform characterization, PI3P binding assays, siRNA knockdown, phagocyte-specific conditional knockout mice, LPS/bacterial infection models, MHC II presentation assays, migration assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including conditional KO in vivo, isoform biochemistry, and multiple functional readouts; single lab with strong mechanistic evidence","pmids":["37463962"],"is_preprint":false},{"year":2023,"finding":"HPIP and RUFY3 co-localize at focal adhesions and endosomal compartments with Rab5. HPIP contains two coiled-coil domains (CC1 and CC2) required for its association with both Rab5 and RUFY3; a CC domain double mutant (mtHPIPΔCC1-2) abolishes this association. HPIP and RUFY3 function as noncanonical guanine nucleotide exchange factors for Rab5; silencing of either HPIP or RUFY3 impairs Rab5 activation, Rab5-mediated focal adhesion disassembly, FAK activation, fibronectin-associated β1 integrin trafficking, and cell migration.","method":"Co-immunoprecipitation, domain deletion mutagenesis, Rab5 GEF activity assay, immunofluorescence colocalization, siRNA knockdown, focal adhesion turnover and migration assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1/2 — in vitro GEF activity assay plus mutagenesis plus functional KD with multiple cellular readouts; single lab with multiple orthogonal methods","pmids":["37797694"],"is_preprint":false},{"year":2025,"finding":"Rufy3 physically interacts with MAP4, and MAP4 interacts with CDK1, placing Rufy3 upstream in a Rufy3/MAP4/CDK1 axis. Rufy3 knockdown induces PANoptosis (combined apoptosis, pyroptosis, and necroptosis) and slows tumor growth in colorectal cancer xenograft models.","method":"Co-immunoprecipitation (Rufy3-MAP4; MAP4-CDK1), western blot, immunofluorescence, mouse xenograft tumor model, siRNA knockdown","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 3 — Co-IP plus in vivo KD phenotype; single lab, limited mechanistic depth","pmids":["40879686"],"is_preprint":false}],"current_model":"RUFY3 is a RUN/FYVE domain-containing adapter protein that (1) links Arl8b to the JIP4-dynein-dynactin retrograde motor complex to drive perinuclear lysosome positioning and regulate lysosome size; (2) serves as a noncanonical GEF for Rab5 (together with HPIP) to support focal adhesion turnover and integrin trafficking; (3) acts as an adapter for the small GTPase Rap2 in neurons, recruiting Tiam2/STEF (a Rac-GEF) downstream of Rap2 via glycoprotein M6A-associated lipid raft domains to establish neuronal polarity and axon growth; (4) controls axon degeneration through a caspase-3-dependent mechanism requiring dephosphorylation at S34; (5) promotes cancer cell migration and invasion through PAK1-dependent upregulation, interaction with FOXK1, and NF-κB-mediated EMT; and (6) in immune cells, exists as an alternative FYVE-bearing isoform that mediates perinuclear endo-lysosome clustering, MHC II antigen presentation, and macrophage migration."},"narrative":{"teleology":[{"year":2007,"claim":"The initial identification of RUFY3 (Singar1) as a brain-enriched RUN-domain protein established its role in suppressing surplus axon formation, revealing that neuronal polarity requires active axon number restriction through a PI3K-dependent mechanism.","evidence":"Overexpression and RNAi knockdown in cultured hippocampal neurons; 2D electrophoresis-based proteomics","pmids":["17439943"],"confidence":"Medium","gaps":["Mechanism by which RUFY3 restricts axon number downstream of PI3K was undefined","No binding partners identified","Single lab observation"]},{"year":2014,"claim":"Discovery that RUFY3 physically interacts with the actin-bundling protein Fascin and colocalizes with it in growth cones provided the first direct link between RUFY3 and the actin cytoskeleton, explaining how it controls axon elongation and growth cone morphology.","evidence":"Co-immunoprecipitation, immunofluorescence colocalization, RNAi knockdown and overexpression in mouse hippocampal neurons","pmids":["24720729"],"confidence":"Medium","gaps":["Whether RUFY3–Fascin interaction is direct or scaffolded was unresolved","Structural basis of interaction unknown"]},{"year":2017,"claim":"Genetic deletion of Rufy3 in mice demonstrated that RUFY3 functions as a Rap2 adapter recruited to lipid raft domains via glycoprotein M6A, where it assembles a ternary complex to recruit the Rac-GEF Tiam2/STEF, thereby establishing the signaling cascade for neuronal polarity.","evidence":"Rufy3 knockout mouse, biochemical fractionation of detergent-resistant membranes, co-immunoprecipitation, immunofluorescence in primary neurons","pmids":["29089386"],"confidence":"High","gaps":["How RUFY3 RUN domain recognizes Rap2-GTP structurally was not determined","Whether this Rap2–RUFY3–Tiam2 axis operates outside the nervous system was unknown"]},{"year":2019,"claim":"RUFY3 was shown to be essential for caspase-3-mediated axon degeneration, and phosphorylation at S34 was identified as a molecular switch: dephosphorylation at S34 is required for degeneration, placing RUFY3 as a gatekeeper between survival and pruning downstream of activated caspases.","evidence":"Rufy3 deletion in vitro and in vivo, mass spectrometry, phosphosite mutagenesis (S34), CASP3 activity assays in TRKA+ sensory neurons","pmids":["31221560"],"confidence":"High","gaps":["Identity of the S34 kinase and phosphatase was not established","Whether the degeneration role requires the same Rap2 adapter function is unknown"]},{"year":2015,"claim":"Identification of RUFY3 as a PAK1-interacting partner that drives F-actin-rich protrusive structures and cancer cell migration extended RUFY3 function beyond neurons, establishing its role as a pro-migratory and pro-invasive factor in gastric cancer, later generalized to colorectal and hepatocellular carcinoma through TGF-β1/EMT, FOXK1, and NF-κB pathways.","evidence":"Co-immunoprecipitation, shRNA/siRNA knockdown, overexpression, migration/invasion assays, xenograft and metastasis models across gastric, colorectal, and hepatocellular carcinoma lines","pmids":["25766321","28089833","28623323","34510031"],"confidence":"Medium","gaps":["Direct phosphorylation of RUFY3 by PAK1 was not demonstrated","How RUFY3 activates NF-κB signaling mechanistically is unclear","Cancer findings largely from single laboratories per tumor type"]},{"year":2022,"claim":"A pivotal mechanistic advance showed RUFY3 is an Arl8b effector that directly bridges Arl8b to the JIP4–dynein–dynactin retrograde motor complex, thereby controlling nutrient-dependent perinuclear lysosome positioning and lysosome size, establishing RUFY3 as a central organelle-positioning adapter outside the nervous system.","evidence":"Co-immunoprecipitation, live-cell imaging, siRNA knockdown, pharmacological rescue with PIKFYVE inhibitor, organelle fractionation","pmids":["35314681"],"confidence":"High","gaps":["Structural basis of simultaneous Arl8b and JIP4 engagement was not resolved","Whether RUFY3 also promotes anterograde transport via kinesin adaptors was not tested"]},{"year":2023,"claim":"Characterization of an alternative FYVE-domain-bearing isoform (iRUFY3) in immune cells—upregulated by microbial stimuli and interferons—demonstrated that RUFY3 controls endo-lysosome clustering, MHC II antigen presentation, and macrophage migration, with conditional knockout aggravating bacterial pneumonia, establishing a critical innate immune function.","evidence":"Isoform characterization, PI3P binding assays, siRNA knockdown, phagocyte-specific conditional knockout mice, LPS and bacterial infection models, MHC II presentation and migration assays","pmids":["37463962"],"confidence":"High","gaps":["Whether iRUFY3 engages the same JIP4–dynein module as the neuronal isoform was not directly tested","Regulation of isoform switching between FYVE-bearing and FYVE-lacking forms is unknown"]},{"year":2023,"claim":"The demonstration that RUFY3, together with HPIP, functions as a noncanonical GEF for Rab5 at focal adhesions revealed a new enzymatic activity for RUFY3 and explained how it controls integrin trafficking and focal adhesion turnover during cell migration.","evidence":"In vitro Rab5 GEF activity assay, co-immunoprecipitation, domain deletion mutagenesis of HPIP, siRNA knockdown, focal adhesion turnover and migration assays","pmids":["37797694"],"confidence":"High","gaps":["Whether RUFY3 has intrinsic GEF activity or only potentiates HPIP GEF activity is not fully delineated","Structural mechanism of nucleotide exchange is unresolved"]},{"year":2025,"claim":"Identification of a RUFY3–MAP4–CDK1 axis in colorectal cancer, where RUFY3 knockdown induces PANoptosis, added a cell-death-regulatory dimension linking RUFY3 to microtubule-associated and cell-cycle proteins.","evidence":"Co-immunoprecipitation (Rufy3–MAP4, MAP4–CDK1), siRNA knockdown, mouse xenograft model","pmids":["40879686"],"confidence":"Medium","gaps":["Direct binding between RUFY3 and MAP4 not confirmed with recombinant proteins","Whether the PANoptosis phenotype reflects a direct RUFY3 function or an indirect consequence of organelle mispositioning is unclear","Single lab, limited mechanistic depth"]},{"year":null,"claim":"Key unresolved questions include the structural basis for RUFY3's simultaneous engagement of multiple small GTPases (Arl8b, Rap2, Rab5, Rap1), how phosphoregulation at S34 intersects with its adapter and GEF functions, and whether the neuronal and immune isoforms share the same JIP4–dynein recruitment mechanism for organelle positioning.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of RUFY3 or any of its complexes","Relative contributions of GEF vs. adapter functions to cell migration are undefined","Isoform-specific interactome has not been comprehensively mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,5,9,11]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[1,2]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5,12]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,1]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[9,11,12]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[9,11]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[9,11,12]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[5,12]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[9,11]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,10,12]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,5,6]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[11]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[6,13]}],"complexes":["Arl8b–RUFY3–JIP4–dynein–dynactin","HPIP–RUFY3–Rab5 GEF complex","Rap2–RUFY3–Tiam2/STEF"],"partners":["ARL8B","JIP4","RAP2A","TIAM2","HPIP","FSCN1","PAK1","FOXK1"],"other_free_text":[]},"mechanistic_narrative":"RUFY3 is a multifunctional RUN- and FYVE-domain-containing adapter protein that couples small GTPases to cytoskeletal effectors and motor complexes, thereby controlling organelle positioning, cell polarity, and migration in both neuronal and non-neuronal contexts. In neurons, RUFY3 acts as an adapter for Rap2, recruiting the Rac-GEF Tiam2/STEF to lipid-raft domains in axonal growth cones to establish polarity, and it governs caspase-3-dependent axon degeneration through phosphoregulation at S34 [PMID:29089386, PMID:31221560]. In non-neuronal cells, RUFY3 functions as an Arl8b effector that bridges Arl8b to the JIP4–dynein–dynactin retrograde motor complex for perinuclear lysosome positioning, and together with HPIP it serves as a noncanonical GEF for Rab5 to drive focal adhesion turnover and integrin trafficking [PMID:35314681, PMID:37797694]. An alternative FYVE-domain-bearing isoform preferentially expressed in immune cells mediates endo-lysosome clustering, MHC II antigen presentation, and macrophage migration, while in multiple cancer types RUFY3 promotes epithelial–mesenchymal transition and metastasis through NF-κB and PAK1-dependent pathways [PMID:37463962, PMID:25766321, PMID:34510031]."},"prefetch_data":{"uniprot":{"accession":"Q7L099","full_name":"Protein RUFY3","aliases":["RUN and FYVE domain-containing protein 3","Rap2-interacting protein x","RIPx","Single axon-regulated protein","Singar"],"length_aa":469,"mass_kda":53.0,"function":"ARL8 effector that promotes the coupling of endolysosomes to dynein-dynactin for retrograde transport along microtubules. Acts by binding both GTP-bound ARL8 and dynein-dynactin. In nonneuronal cells, promotes concentration of endolysosomes in the juxtanuclear area. In hippocampal neurons, drives retrograde transport of endolysosomes from the axon to the soma (PubMed:35314674). Plays a role in the generation of neuronal polarity formation and axon growth (By similarity). Implicated in the formation of a single axon by developing neurons (By similarity). May inhibit the formation of additional axons by inhibition of PI3K in minor neuronal processes (By similarity). Plays a role in the formation of F-actin-enriched protrusive structures at the cell periphery (PubMed:25766321). Plays a role in cytoskeletal organization by regulating the subcellular localization of FSCN1 and DBN1 at axonal growth cones (By similarity)","subcellular_location":"Cytoplasm; Endomembrane system; Cell projection, invadopodium; Perikaryon; Cell projection; Cell projection, growth cone; Cell projection, filopodium; Cell projection, lamellipodium; Lysosome","url":"https://www.uniprot.org/uniprotkb/Q7L099/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RUFY3","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RUFY3","total_profiled":1310},"omim":[{"mim_id":"620994","title":"RUN AND FYVE DOMAINS-CONTAINING PROTEIN 4; RUFY4","url":"https://www.omim.org/entry/620994"},{"mim_id":"611194","title":"RUN AND FYVE DOMAINS-CONTAINING PROTEIN 3; RUFY3","url":"https://www.omim.org/entry/611194"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"retina","ntpm":111.4}],"url":"https://www.proteinatlas.org/search/RUFY3"},"hgnc":{"alias_symbol":["RIPx","KIAA0871","Singar1","ZFYVE30"],"prev_symbol":[]},"alphafold":{"accession":"Q7L099","domains":[{"cath_id":"1.20.58.900","chopping":"23-47_61-119_126-242","consensus_level":"high","plddt":86.41,"start":23,"end":242},{"cath_id":"-","chopping":"280-324_366-454","consensus_level":"medium","plddt":93.5493,"start":280,"end":454}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q7L099","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q7L099-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q7L099-F1-predicted_aligned_error_v6.png","plddt_mean":81.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RUFY3","jax_strain_url":"https://www.jax.org/strain/search?query=RUFY3"},"sequence":{"accession":"Q7L099","fasta_url":"https://rest.uniprot.org/uniprotkb/Q7L099.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q7L099/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q7L099"}},"corpus_meta":[{"pmid":"35314681","id":"PMC_35314681","title":"RUFY3 links Arl8b and JIP4-Dynein complex to regulate lysosome size and positioning.","date":"2022","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/35314681","citation_count":67,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"17439943","id":"PMC_17439943","title":"Singar1, a novel RUN domain-containing protein, suppresses formation of surplus axons for neuronal polarity.","date":"2007","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/17439943","citation_count":53,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"31547840","id":"PMC_31547840","title":"HOXD9 promotes the growth, invasion and metastasis of gastric cancer cells by transcriptional activation of RUFY3.","date":"2019","source":"Journal of experimental & clinical cancer research : CR","url":"https://pubmed.ncbi.nlm.nih.gov/31547840","citation_count":53,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"25766321","id":"PMC_25766321","title":"PAK1 regulates RUFY3-mediated gastric cancer cell migration and invasion.","date":"2015","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/25766321","citation_count":45,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"10498718","id":"PMC_10498718","title":"The ripX locus of Bacillus subtilis encodes a site-specific recombinase involved in proper chromosome partitioning.","date":"1999","source":"Journal of bacteriology","url":"https://pubmed.ncbi.nlm.nih.gov/10498718","citation_count":41,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"24720729","id":"PMC_24720729","title":"Rufy3, a protein specifically expressed in neurons, interacts with actin-bundling protein Fascin to control the growth of axons.","date":"2014","source":"Journal of neurochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/24720729","citation_count":34,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"28623323","id":"PMC_28623323","title":"RUFY3 interaction with FOXK1 promotes invasion and metastasis in colorectal cancer.","date":"2017","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/28623323","citation_count":26,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"28089833","id":"PMC_28089833","title":"Rufy3 promotes metastasis through epithelial-mesenchymal transition in colorectal cancer.","date":"2017","source":"Cancer letters","url":"https://pubmed.ncbi.nlm.nih.gov/28089833","citation_count":25,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"29089386","id":"PMC_29089386","title":"Rufy3 is an adapter protein for small GTPases that activates a Rac guanine nucleotide exchange factor to control neuronal polarity.","date":"2017","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/29089386","citation_count":17,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"32183439","id":"PMC_32183439","title":"Ralstonia solanacearum elicitor RipX Induces Defense Reaction by Suppressing the Mitochondrial atpA Gene in Host Plant.","date":"2020","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/32183439","citation_count":17,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"31221560","id":"PMC_31221560","title":"Neuronally Enriched RUFY3 Is Required for Caspase-Mediated Axon Degeneration.","date":"2019","source":"Neuron","url":"https://pubmed.ncbi.nlm.nih.gov/31221560","citation_count":12,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"35461284","id":"PMC_35461284","title":"Roles of Rufy3 in experimental subarachnoid hemorrhage-induced early brain injury via accelerating neuronal axon repair and synaptic plasticity.","date":"2022","source":"Molecular 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to facilitate retrograde lysosomal transport; RUFY3 knockdown disrupts Arl8b-positive endosome positioning, reduces Arl8b colocalization with Rab7-marked late endosomes, and reduces lysosome size (rescuable by PIKFYVE inhibition).\",\n      \"method\": \"Co-immunoprecipitation, knockdown (siRNA/shRNA), live-cell imaging, colocalization microscopy, genetic epistasis with PIKFYVE inhibitor\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, clean KD with multiple defined cellular phenotypes, pathway epistasis; moderate evidence from single lab with orthogonal methods\",\n      \"pmids\": [\"35314681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"RUFY3/Singar1, a RUN domain-containing protein predominantly expressed in brain, suppresses formation of surplus axons in hippocampal neurons; its knockdown increases surplus-axon neurons in a PI3K-dependent manner, and it acts downstream of or in parallel with shootin1-PI3K signaling to ensure single-axon polarity.\",\n      \"method\": \"Overexpression, RNA interference (RNAi), PI3K inhibitor epistasis, 2D electrophoresis proteomics identification, live-cell imaging of hippocampal neurons\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KD/OE with defined neuronal polarity phenotype plus pathway epistasis (PI3K inhibitor rescue)\",\n      \"pmids\": [\"17439943\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Rufy3 interacts with actin-bundling protein Fascin and with Drebrin in hippocampal neuron growth cones; Rufy3 knockdown impairs Fascin and actin filament distribution, increases multipolar neurons, and reduces axon length, indicating Rufy3 controls axon elongation through Fascin-mediated actin organization.\",\n      \"method\": \"Co-immunoprecipitation/pulldown, immunofluorescence colocalization, siRNA knockdown, overexpression in primary hippocampal neurons\",\n      \"journal\": \"Journal of Neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — Co-IP interaction plus KD phenotype in neurons; single lab, moderate evidence\",\n      \"pmids\": [\"24720729\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Rufy3 is recruited to detergent-resistant membrane (lipid raft-like) domains via glycoprotein M6A, forms a ternary complex with Rap2 in axonal growth cones, and promotes assembly/localization of the Rac-GEF Tiam2/STEF downstream of Rap2; Rufy3-KO mice show loss of Tiam2/STEF accumulation and impaired neuronal polarity.\",\n      \"method\": \"Rufy3 knockout mouse generation, detergent-resistant membrane fractionation, biochemical co-immunoprecipitation, immunofluorescence localization in neurons\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse with defined pathway epistasis (Rap2→Rufy3→Tiam2/STEF), fractionation, and Co-IP; single lab but multiple orthogonal approaches\",\n      \"pmids\": [\"29089386\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PAK1 physically interacts with RUFY3, promotes RUFY3 expression, and is required for RUFY3-induced F-actin protrusion/invadopodia formation and gastric cancer cell migration and invasion; PAK1 inhibition attenuates RUFY3-induced migration.\",\n      \"method\": \"Co-immunoprecipitation, overexpression, siRNA knockdown, PAK1 inhibitor treatment, F-actin staining, migration/invasion assays\",\n      \"journal\": \"Cell Death & Disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single Co-IP plus functional rescue experiments; single lab, moderate evidence\",\n      \"pmids\": [\"25766321\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RUFY3 is essential for caspase-mediated axon degeneration in TRKA+ sensory neurons; deletion of Rufy3 protects axons even when active CASP3 is present; dephosphorylation of RUFY3 at residue S34 appears required for this degeneration, identified by mass spectrometry-based phosphoproteomics.\",\n      \"method\": \"Mass spectrometry phosphoproteomics, Rufy3 knockout mouse, in vitro axon degeneration assay, in vivo sensory axon degeneration, site-directed mutagenesis (S34 phosphorylation)\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — KO mouse + in vitro/in vivo degeneration assay + phosphosite mutagenesis + MS; single lab but multiple rigorous orthogonal methods\",\n      \"pmids\": [\"31221560\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RUFY3 physically interacts with transcription factor FOXK1 in colorectal cancer cells; FOXK1 is required downstream of RUFY3 to drive EMT and metastatic phenotypes, as FOXK1 siRNA reverses RUFY3-overexpression-induced EMT.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown epistasis, EMT marker analysis, in vivo orthotopic implantation\",\n      \"journal\": \"Scientific Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single Co-IP plus epistasis experiment; single lab, moderate evidence\",\n      \"pmids\": [\"28623323\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TGF-β1 induces RUFY3 expression in a dose-dependent manner in colorectal cancer cells, and RUFY3 mediates TGF-β1-induced EMT; RUFY3 knockdown inhibits TGF-β1-driven EMT and reduces invasion.\",\n      \"method\": \"TGF-β1 dose-response western blot, siRNA knockdown, EMT marker analysis, invasion assays\",\n      \"journal\": \"Cancer Letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — functional KD with pathway linkage; single lab, single approach per finding\",\n      \"pmids\": [\"28089833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RUFY3 promotes hepatocellular carcinoma cell growth, migration, and invasion through activation of NF-κB-mediated EMT; knockdown of RUFY3 suppresses NF-κB activity and reverses EMT markers.\",\n      \"method\": \"siRNA knockdown, NF-κB reporter/western blot, EMT marker analysis, in vitro and xenograft in vivo models\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — KD with pathway mechanistic follow-up; single lab, moderate evidence\",\n      \"pmids\": [\"34510031\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"RUFY3 exists as two alternative isoforms: one with a C-terminal FYVE domain (iRUFY3, preferentially expressed in immune cells) and one without; the FYVE domain confers affinity for phosphatidylinositol 3-phosphate on endosomal membranes. iRUFY3 is required for ARL8b+/LAMP1+ endo-lysosome perinuclear positioning in LPS-activated macrophages and controls macrophage migration, MHC II antigen presentation, IFN-γ responses, and intracellular Salmonella replication.\",\n      \"method\": \"Isoform cloning and characterization, PI3P binding assay, conditional phagocyte-specific rufy3 knockout mice, immunofluorescence, MHC II presentation assay, intracellular bacterial replication assay, LPS and bacterial pneumonia mouse models\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO mouse with multiple defined immune phenotypes, biochemical PI3P binding, isoform characterization; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"37463962\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"RUFY3 and HPIP function as noncanonical guanine nucleotide exchange factors (GEFs) for Rab5; they co-localize with Rab5 at focal adhesions and endosomal compartments; loss of RUFY3 impairs Rab5 activation, Rab5-mediated focal adhesion disassembly, FAK activation, β1-integrin trafficking, and cell migration.\",\n      \"method\": \"Co-immunoprecipitation, Rab5 GEF activity assay, coiled-coil domain deletion mutants, siRNA knockdown, focal adhesion disassembly assay, integrin trafficking assay\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro GEF activity assay plus domain mutant validation and KD with defined cellular phenotypes; single lab\",\n      \"pmids\": [\"37797694\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Rufy3 interacts with Rap1 in neurons; Rufy3 overexpression increases Rap1-GTP levels and activates the Rap1/ARAP3/Rho/Fascin pathway to promote axon repair, and the Rap1/MEK/ERK/synapsin I pathway to enhance synaptic plasticity after subarachnoid hemorrhage.\",\n      \"method\": \"Co-immunoprecipitation (Rufy3-Rap1), Rap1 GTP-loading assay, lentiviral overexpression/knockdown, western blot for pathway components, in vivo SAH rat model\",\n      \"journal\": \"Molecular Brain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP and GTPase loading assay with in vivo functional follow-up; single lab\",\n      \"pmids\": [\"35461284\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Rufy3 physically binds MAP4, and MAP4 binds CDK1; Rufy3 knockdown in colorectal cancer cells induces PANoptosis and slows tumor growth through the MAP4/CDK1 axis.\",\n      \"method\": \"Co-immunoprecipitation (Rufy3-MAP4, MAP4-CDK1), siRNA knockdown, western blot, xenograft mouse model\",\n      \"journal\": \"FASEB Journal\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single Co-IP; single lab, no replication, limited mechanistic follow-up\",\n      \"pmids\": [\"40879686\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RUFY3 is a RUN/FYVE domain-containing adapter protein that, depending on cell type, links Arl8b to the JIP4-dynein-dynactin complex to drive retrograde lysosome transport and control lysosome size/positioning; acts as a Rab5 GEF (with HPIP) to regulate endocytosis-coupled focal adhesion turnover and cell migration; forms a ternary complex with Rap2 and the Rac-GEF Tiam2/STEF at lipid raft domains to establish neuronal polarity and axon growth; interacts with Fascin and Drebrin to organize actin in growth cones; and, in a dephosphorylation-dependent (S34) manner, is required for caspase-3-mediated non-apoptotic axon degeneration in sensory neurons.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2007,\n      \"finding\": \"RUFY3 (identified as Singar1/KIAA0871/RPIPx) is a RUN domain-containing protein predominantly expressed in the brain. It suppresses formation of surplus axons to ensure neuronal polarity: overexpression suppressed surplus axons induced by excess shootin1, while knockdown of singar1/singar2 by RNAi increased the population of neurons bearing surplus axons in a PI3K-dependent manner. Singar1 was found diffusely localized in hippocampal neurons with moderate accumulation in growth cones.\",\n      \"method\": \"Overexpression and RNAi knockdown in cultured hippocampal neurons; 2D electrophoresis-based proteomics for identification\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KD/KO with defined cellular phenotype; single lab\",\n      \"pmids\": [\"17439943\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Rufy3 is a neuron-specific, actin filament-relevant protein that physically interacts with the actin-bundling protein Fascin (and Drebrin) and colocalizes with Fascin in growth cones. Knockdown of Rufy3 impaired Fascin and F-actin distribution, increased the proportion of multipolar neurons, and decreased axon length; overexpression led to longer axons and expanded Drebrin distribution throughout the growth cone.\",\n      \"method\": \"Co-immunoprecipitation, colocalization by immunofluorescence, RNAi knockdown and overexpression in mouse hippocampal neurons\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — reciprocal interaction evidence plus KD/OE phenotype; single lab\",\n      \"pmids\": [\"24720729\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PAK1 (P21-activated kinase-1) interacts with RUFY3 and promotes RUFY3 expression; RUFY3 overexpression drives formation of F-actin-enriched protrusive structures at the cell periphery and induces gastric cancer cell migration and invasion. Inhibition of PAK1 attenuates RUFY3-induced migration, and combined knockdown of PAK1 and RUFY3 shows an enhanced inhibitory effect on migration compared with knockdown of either alone.\",\n      \"method\": \"Co-immunoprecipitation, overexpression, shRNA knockdown, cell migration/invasion assays in gastric cancer cell lines\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — Co-IP plus functional KD/OE; single lab\",\n      \"pmids\": [\"25766321\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Rufy3 promotes EMT in colorectal cancer cells downstream of TGF-β1 (TGF-β1 induces Rufy3 expression in a dose-dependent manner); siRNA-mediated repression of Rufy3 induces G0/G1 cell cycle arrest and reverses EMT. Rufy3 overexpression enhances CRC cell proliferation in vitro and in vivo and promotes metastatic phenotypes.\",\n      \"method\": \"siRNA knockdown, overexpression, TGF-β1 stimulation, cell cycle analysis, in vivo xenograft/metastasis models\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD/OE with defined cellular phenotype and upstream signal identified; single lab\",\n      \"pmids\": [\"28089833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RUFY3 physically interacts with the transcription factor FOXK1 in colorectal cancer cells. siRNA-mediated repression of FOXK1 in RUFY3-overexpressing cells reverses EMT and metastatic phenotypes; in vivo, FOXK1 promotes RUFY3-mediated metastasis. A positive correlation exists between RUFY3 and FOXK1 expression.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, siRNA knockdown, orthotopic implantation in vivo\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP plus functional epistasis; single lab\",\n      \"pmids\": [\"28623323\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Rufy3 functions as an adapter protein for small GTPase Rap2 in developing neurons. It is recruited via glycoprotein M6A to detergent-resistant membrane (lipid raft-like) domains. As part of a ternary complex, Rufy3 induces assembly of Rap2 in the axonal growth cone and is required downstream of Rap2 for accumulation of the Rac-GEF Tiam2/STEF; Rufy3 knockout mice showed inhibited Tiam2/STEF localization and impaired neuronal polarity.\",\n      \"method\": \"Rufy3 knockout mouse generation, biochemical fractionation (DRM), co-immunoprecipitation, immunofluorescence in primary neurons\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse plus biochemical fractionation, Co-IP, and epistasis; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"29089386\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RUFY3 is essential for caspase-mediated axon degeneration in TRKA+ sensory neurons. Deletion of Rufy3 protects axons from degeneration even in the presence of activated CASP3 competent to cleave endogenous substrates. Dephosphorylation of RUFY3 at residue S34 appears required for axon degeneration, providing a mechanism for local caspase-driven degeneration control.\",\n      \"method\": \"Rufy3 deletion (in vitro and in vivo), mass spectrometry discovery, phosphorylation site mutagenesis (S34), CASP3 activity assays in sensory neurons\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — genetic deletion in vivo + in vitro, PTM mutagenesis, mass spectrometry; multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"31221560\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"HOXD9 directly binds the RUFY3 promoter (demonstrated by ChIP and luciferase assays) to transcriptionally activate RUFY3 expression, and this HOXD9-RUFY3 axis promotes proliferation, invasion, and migration of gastric cancer cells. Inhibition of RUFY3 attenuated the oncogenic effects of HOXD9 overexpression in vitro and in vivo.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), luciferase reporter assay, RUFY3 knockdown, in vivo nude mouse xenograft/metastasis\",\n      \"journal\": \"Journal of experimental & clinical cancer research : CR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP + luciferase + functional rescue; single lab\",\n      \"pmids\": [\"31547840\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RUFY3 promotes hepatocellular carcinoma progression through activation of NF-κB-mediated epithelial-mesenchymal transition. Knockdown of RUFY3 inhibited NF-κB signaling and reversed EMT, while RUFY3 overexpression activated NF-κB and enhanced HCC cell growth, invasion, and metastasis both in vitro and in vivo.\",\n      \"method\": \"shRNA knockdown, overexpression, NF-κB reporter assays, xenograft and lung metastasis mouse models\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD/OE with pathway-level readout and in vivo validation; single lab\",\n      \"pmids\": [\"34510031\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RUFY3 is an effector of Arl8b that links Arl8b to the JIP4-dynein-dynactin retrograde motor complex to regulate lysosome retrograde transport. RUFY3 knockdown disrupts positioning of Arl8b-positive endosomes, reduces Arl8b colocalization with Rab7-marked late endosomes, impairs nutrient-dependent lysosome redistribution, and significantly reduces lysosome size (rescued by PIKFYVE inhibition). RUFY3 promotes perinuclear clustering of lysosomes.\",\n      \"method\": \"Co-immunoprecipitation, live-cell imaging, fluorescence colocalization, siRNA knockdown, pharmacological rescue (PIKFYVE inhibitor), organelle fractionation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (Co-IP, live imaging, KD, pharmacological rescue); single lab with strong mechanistic evidence\",\n      \"pmids\": [\"35314681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In a subarachnoid hemorrhage model, Rufy3 interacts with Rap1 and promotes Rap1-GTP loading. Rufy3 overexpression activates the Rap1/Arap3/Rho/Fascin pathway to inhibit axon injury and accelerate axon repair, and activates the Rap1/MEK/ERK/Synapsin I pathway to enhance synaptic plasticity. Rufy3 overexpression combined with a Rap1 agonist showed synergistic neuroprotective effects.\",\n      \"method\": \"Co-immunoprecipitation (Rufy3-Rap1), lentiviral overexpression/knockdown in rat SAH model, Rap1-GTP pull-down, western blot for pathway components, in vivo behavioral assays\",\n      \"journal\": \"Molecular brain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — Co-IP plus in vivo pathway analysis; single lab\",\n      \"pmids\": [\"35461284\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"RUFY3 exists as two alternative isoforms: a FYVE domain-bearing isoform (iRUFY3) with affinity for phosphatidylinositol 3-phosphate on endosomal membranes (preferentially expressed in immune cells and upregulated by microbes/interferons) and an isoform lacking the FYVE domain. iRUFY3 is required for ARL8b+/LAMP1+ endo-lysosome positioning in the pericentriolar cloud of LPS-activated macrophages, and controls macrophage migration, MHC II antigen presentation, and responses to IFN-γ. Phagocyte-specific Rufy3 inactivation aggravated LPS-induced pathology and bacterial pneumonia in mice.\",\n      \"method\": \"Isoform characterization, PI3P binding assays, siRNA knockdown, phagocyte-specific conditional knockout mice, LPS/bacterial infection models, MHC II presentation assays, migration assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including conditional KO in vivo, isoform biochemistry, and multiple functional readouts; single lab with strong mechanistic evidence\",\n      \"pmids\": [\"37463962\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"HPIP and RUFY3 co-localize at focal adhesions and endosomal compartments with Rab5. HPIP contains two coiled-coil domains (CC1 and CC2) required for its association with both Rab5 and RUFY3; a CC domain double mutant (mtHPIPΔCC1-2) abolishes this association. HPIP and RUFY3 function as noncanonical guanine nucleotide exchange factors for Rab5; silencing of either HPIP or RUFY3 impairs Rab5 activation, Rab5-mediated focal adhesion disassembly, FAK activation, fibronectin-associated β1 integrin trafficking, and cell migration.\",\n      \"method\": \"Co-immunoprecipitation, domain deletion mutagenesis, Rab5 GEF activity assay, immunofluorescence colocalization, siRNA knockdown, focal adhesion turnover and migration assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — in vitro GEF activity assay plus mutagenesis plus functional KD with multiple cellular readouts; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"37797694\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Rufy3 physically interacts with MAP4, and MAP4 interacts with CDK1, placing Rufy3 upstream in a Rufy3/MAP4/CDK1 axis. Rufy3 knockdown induces PANoptosis (combined apoptosis, pyroptosis, and necroptosis) and slows tumor growth in colorectal cancer xenograft models.\",\n      \"method\": \"Co-immunoprecipitation (Rufy3-MAP4; MAP4-CDK1), western blot, immunofluorescence, mouse xenograft tumor model, siRNA knockdown\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP plus in vivo KD phenotype; single lab, limited mechanistic depth\",\n      \"pmids\": [\"40879686\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RUFY3 is a RUN/FYVE domain-containing adapter protein that (1) links Arl8b to the JIP4-dynein-dynactin retrograde motor complex to drive perinuclear lysosome positioning and regulate lysosome size; (2) serves as a noncanonical GEF for Rab5 (together with HPIP) to support focal adhesion turnover and integrin trafficking; (3) acts as an adapter for the small GTPase Rap2 in neurons, recruiting Tiam2/STEF (a Rac-GEF) downstream of Rap2 via glycoprotein M6A-associated lipid raft domains to establish neuronal polarity and axon growth; (4) controls axon degeneration through a caspase-3-dependent mechanism requiring dephosphorylation at S34; (5) promotes cancer cell migration and invasion through PAK1-dependent upregulation, interaction with FOXK1, and NF-κB-mediated EMT; and (6) in immune cells, exists as an alternative FYVE-bearing isoform that mediates perinuclear endo-lysosome clustering, MHC II antigen presentation, and macrophage migration.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"RUFY3 is a RUN and FYVE domain-containing adaptor protein that integrates small GTPase signaling with membrane trafficking, cytoskeletal organization, and cell polarity across neuronal and non-neuronal cell types. In neurons, RUFY3 localizes to lipid raft domains and growth cones, where it forms a ternary complex with Rap2 and the Rac-GEF Tiam2/STEF to establish single-axon polarity, interacts with Fascin and Drebrin to organize actin filaments for axon elongation, and undergoes dephosphorylation at S34 to become essential for caspase-3-mediated non-apoptotic axon degeneration [PMID:29089386, PMID:24720729, PMID:31221560, PMID:17439943]. In non-neuronal cells, RUFY3 serves as an Arl8b effector that recruits the JIP4–dynein–dynactin complex to drive retrograde lysosome transport and control lysosome size and positioning, with an alternatively spliced FYVE domain-containing isoform (iRUFY3) preferentially expressed in immune cells mediating endo-lysosome positioning required for macrophage MHC II antigen presentation and intracellular pathogen control [PMID:35314681, PMID:37463962]. RUFY3, together with HPIP, functions as a noncanonical Rab5 guanine nucleotide exchange factor that couples Rab5 activation to focal adhesion disassembly, β1-integrin endocytic trafficking, and cell migration [PMID:37797694].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Establishing RUFY3 as a neuronal polarity regulator resolved the question of how single-axon specification is maintained downstream of PI3K signaling in hippocampal neurons.\",\n      \"evidence\": \"Overexpression, RNAi, and PI3K inhibitor epistasis in cultured hippocampal neurons\",\n      \"pmids\": [\"17439943\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Direct binding partners and upstream activators of RUFY3 in polarity were unknown\",\n        \"RUN domain function was not dissected\",\n        \"In vivo relevance in intact brain not demonstrated\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identification of Fascin and Drebrin as RUFY3 interactors in growth cones revealed that RUFY3 controls axon elongation through actin cytoskeleton organization, not solely through signaling.\",\n      \"evidence\": \"Co-IP/pulldown and siRNA knockdown in primary hippocampal neurons\",\n      \"pmids\": [\"24720729\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether RUFY3 directly bundles or merely scaffolds actin regulators was unresolved\",\n        \"Structural basis of Fascin–RUFY3 interaction unknown\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Generation of Rufy3 knockout mice and biochemical reconstitution of a Rap2–Rufy3–Tiam2/STEF ternary complex at lipid raft domains established how RUFY3 couples Rap2 GTPase activity to Rac-GEF localization for neuronal polarity.\",\n      \"evidence\": \"Rufy3 KO mice, detergent-resistant membrane fractionation, and co-immunoprecipitation in neurons\",\n      \"pmids\": [\"29089386\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether Rufy3 has catalytic activity on Rap2 or is purely a scaffold was not distinguished\",\n        \"Mechanism of RUFY3 recruitment to lipid rafts via M6A remained correlative\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"TGF-β1-dependent induction of RUFY3 and its interaction with FOXK1 in colorectal cancer linked RUFY3 to epithelial-mesenchymal transition outside the nervous system, broadening its functional scope to cancer cell invasion.\",\n      \"evidence\": \"TGF-β1 dose-response, siRNA epistasis, Co-IP, in vivo orthotopic implantation in colorectal cancer cells\",\n      \"pmids\": [\"28089833\", \"28623323\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct transcriptional mechanism linking FOXK1 to RUFY3-driven EMT was not delineated\",\n        \"Whether RUFY3's RUN/FYVE domains are required for cancer phenotypes was untested\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Phosphoproteomics and Rufy3 knockout demonstrated that RUFY3 is a required effector downstream of caspase-3 in non-apoptotic axon degeneration, with dephosphorylation at S34 gating its pro-degenerative function — establishing a regulated, non-apoptotic role for RUFY3.\",\n      \"evidence\": \"Mass spectrometry phosphoproteomics, Rufy3 KO mice, in vitro and in vivo sensory axon degeneration assays, S34 phosphomutant analysis\",\n      \"pmids\": [\"31221560\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Identity of the S34 phosphatase was unknown\",\n        \"Downstream targets of dephosphorylated RUFY3 that execute degeneration were not identified\",\n        \"Relationship between degeneration and RUFY3's known trafficking/polarity roles was unclear\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Biochemical and imaging evidence that RUFY3 bridges Arl8b to the JIP4–dynein–dynactin motor complex answered how Arl8b-positive late endosomes achieve retrograde transport and perinuclear positioning, defining RUFY3 as a bona fide membrane trafficking adaptor.\",\n      \"evidence\": \"Reciprocal Co-IP, siRNA/shRNA knockdown, live-cell imaging, PIKFYVE inhibitor epistasis in non-neuronal cells\",\n      \"pmids\": [\"35314681\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether RUFY3's FYVE domain is necessary for this Arl8b-dependent function was not tested\",\n        \"Structural basis of RUFY3–JIP4 interaction unresolved\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Discovery of the FYVE domain-containing iRUFY3 isoform in immune cells, which binds PI3P and controls endo-lysosome positioning in activated macrophages, extended RUFY3's Arl8b-adaptor function to innate immunity — including MHC II presentation and pathogen containment.\",\n      \"evidence\": \"Isoform cloning, PI3P binding assay, conditional phagocyte-specific Rufy3 KO mice, LPS stimulation, Salmonella infection, bacterial pneumonia model\",\n      \"pmids\": [\"37463962\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether iRUFY3 and neuronal RUFY3 compete or cooperate when co-expressed is unknown\",\n        \"Mechanism by which iRUFY3 regulates IFN-γ responses not delineated\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstration that RUFY3, together with HPIP, acts as a noncanonical Rab5 GEF revealed an enzymatic activity for RUFY3, coupling Rab5 activation to focal adhesion turnover and integrin trafficking — connecting its trafficking and migration functions.\",\n      \"evidence\": \"In vitro Rab5 GEF activity assay, coiled-coil domain deletion mutants, siRNA knockdown, focal adhesion and integrin trafficking assays\",\n      \"pmids\": [\"37797694\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"GEF activity was shown with HPIP co-dependence; whether RUFY3 alone has intrinsic GEF activity is unclear\",\n        \"Structural basis for nucleotide exchange was not provided\",\n        \"Independent replication of GEF activity is needed\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the structural basis for RUFY3's multi-partner recognition (Arl8b, Rap2, Rab5, Fascin), whether RUFY3's GEF activity is direct or scaffolding-dependent, how S34 dephosphorylation mechanistically activates axon degeneration, and the functional interplay between RUFY3's trafficking and cytoskeletal roles in vivo.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No high-resolution structure of RUFY3 or any of its domain complexes exists\",\n        \"Relative contributions of RUN vs. FYVE vs. coiled-coil domains to each cellular function are not systematically dissected\",\n        \"In vivo phenotypes in brain-specific conditional KO have not been reported\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 3, 9]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [10]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 10]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [0, 9, 10]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [0, 9]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0, 9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 9]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 9, 10]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 3, 10]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [1, 3, 5]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"complexes\": [\n      \"Arl8b–RUFY3–JIP4–dynein–dynactin\",\n      \"Rap2–RUFY3–Tiam2/STEF\",\n      \"RUFY3–HPIP (Rab5 GEF complex)\"\n    ],\n    \"partners\": [\n      \"ARL8B\",\n      \"JIP4\",\n      \"TIAM2\",\n      \"RAP2A\",\n      \"FSCN1\",\n      \"DBN1\",\n      \"HPIP\",\n      \"PAK1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"RUFY3 is a multifunctional RUN- and FYVE-domain-containing adapter protein that couples small GTPases to cytoskeletal effectors and motor complexes, thereby controlling organelle positioning, cell polarity, and migration in both neuronal and non-neuronal contexts. In neurons, RUFY3 acts as an adapter for Rap2, recruiting the Rac-GEF Tiam2/STEF to lipid-raft domains in axonal growth cones to establish polarity, and it governs caspase-3-dependent axon degeneration through phosphoregulation at S34 [PMID:29089386, PMID:31221560]. In non-neuronal cells, RUFY3 functions as an Arl8b effector that bridges Arl8b to the JIP4–dynein–dynactin retrograde motor complex for perinuclear lysosome positioning, and together with HPIP it serves as a noncanonical GEF for Rab5 to drive focal adhesion turnover and integrin trafficking [PMID:35314681, PMID:37797694]. An alternative FYVE-domain-bearing isoform preferentially expressed in immune cells mediates endo-lysosome clustering, MHC II antigen presentation, and macrophage migration, while in multiple cancer types RUFY3 promotes epithelial–mesenchymal transition and metastasis through NF-κB and PAK1-dependent pathways [PMID:37463962, PMID:25766321, PMID:34510031].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"The initial identification of RUFY3 (Singar1) as a brain-enriched RUN-domain protein established its role in suppressing surplus axon formation, revealing that neuronal polarity requires active axon number restriction through a PI3K-dependent mechanism.\",\n      \"evidence\": \"Overexpression and RNAi knockdown in cultured hippocampal neurons; 2D electrophoresis-based proteomics\",\n      \"pmids\": [\"17439943\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which RUFY3 restricts axon number downstream of PI3K was undefined\", \"No binding partners identified\", \"Single lab observation\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Discovery that RUFY3 physically interacts with the actin-bundling protein Fascin and colocalizes with it in growth cones provided the first direct link between RUFY3 and the actin cytoskeleton, explaining how it controls axon elongation and growth cone morphology.\",\n      \"evidence\": \"Co-immunoprecipitation, immunofluorescence colocalization, RNAi knockdown and overexpression in mouse hippocampal neurons\",\n      \"pmids\": [\"24720729\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether RUFY3–Fascin interaction is direct or scaffolded was unresolved\", \"Structural basis of interaction unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Genetic deletion of Rufy3 in mice demonstrated that RUFY3 functions as a Rap2 adapter recruited to lipid raft domains via glycoprotein M6A, where it assembles a ternary complex to recruit the Rac-GEF Tiam2/STEF, thereby establishing the signaling cascade for neuronal polarity.\",\n      \"evidence\": \"Rufy3 knockout mouse, biochemical fractionation of detergent-resistant membranes, co-immunoprecipitation, immunofluorescence in primary neurons\",\n      \"pmids\": [\"29089386\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How RUFY3 RUN domain recognizes Rap2-GTP structurally was not determined\", \"Whether this Rap2–RUFY3–Tiam2 axis operates outside the nervous system was unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"RUFY3 was shown to be essential for caspase-3-mediated axon degeneration, and phosphorylation at S34 was identified as a molecular switch: dephosphorylation at S34 is required for degeneration, placing RUFY3 as a gatekeeper between survival and pruning downstream of activated caspases.\",\n      \"evidence\": \"Rufy3 deletion in vitro and in vivo, mass spectrometry, phosphosite mutagenesis (S34), CASP3 activity assays in TRKA+ sensory neurons\",\n      \"pmids\": [\"31221560\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the S34 kinase and phosphatase was not established\", \"Whether the degeneration role requires the same Rap2 adapter function is unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identification of RUFY3 as a PAK1-interacting partner that drives F-actin-rich protrusive structures and cancer cell migration extended RUFY3 function beyond neurons, establishing its role as a pro-migratory and pro-invasive factor in gastric cancer, later generalized to colorectal and hepatocellular carcinoma through TGF-β1/EMT, FOXK1, and NF-κB pathways.\",\n      \"evidence\": \"Co-immunoprecipitation, shRNA/siRNA knockdown, overexpression, migration/invasion assays, xenograft and metastasis models across gastric, colorectal, and hepatocellular carcinoma lines\",\n      \"pmids\": [\"25766321\", \"28089833\", \"28623323\", \"34510031\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct phosphorylation of RUFY3 by PAK1 was not demonstrated\", \"How RUFY3 activates NF-κB signaling mechanistically is unclear\", \"Cancer findings largely from single laboratories per tumor type\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"A pivotal mechanistic advance showed RUFY3 is an Arl8b effector that directly bridges Arl8b to the JIP4–dynein–dynactin retrograde motor complex, thereby controlling nutrient-dependent perinuclear lysosome positioning and lysosome size, establishing RUFY3 as a central organelle-positioning adapter outside the nervous system.\",\n      \"evidence\": \"Co-immunoprecipitation, live-cell imaging, siRNA knockdown, pharmacological rescue with PIKFYVE inhibitor, organelle fractionation\",\n      \"pmids\": [\"35314681\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of simultaneous Arl8b and JIP4 engagement was not resolved\", \"Whether RUFY3 also promotes anterograde transport via kinesin adaptors was not tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Characterization of an alternative FYVE-domain-bearing isoform (iRUFY3) in immune cells—upregulated by microbial stimuli and interferons—demonstrated that RUFY3 controls endo-lysosome clustering, MHC II antigen presentation, and macrophage migration, with conditional knockout aggravating bacterial pneumonia, establishing a critical innate immune function.\",\n      \"evidence\": \"Isoform characterization, PI3P binding assays, siRNA knockdown, phagocyte-specific conditional knockout mice, LPS and bacterial infection models, MHC II presentation and migration assays\",\n      \"pmids\": [\"37463962\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether iRUFY3 engages the same JIP4–dynein module as the neuronal isoform was not directly tested\", \"Regulation of isoform switching between FYVE-bearing and FYVE-lacking forms is unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"The demonstration that RUFY3, together with HPIP, functions as a noncanonical GEF for Rab5 at focal adhesions revealed a new enzymatic activity for RUFY3 and explained how it controls integrin trafficking and focal adhesion turnover during cell migration.\",\n      \"evidence\": \"In vitro Rab5 GEF activity assay, co-immunoprecipitation, domain deletion mutagenesis of HPIP, siRNA knockdown, focal adhesion turnover and migration assays\",\n      \"pmids\": [\"37797694\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RUFY3 has intrinsic GEF activity or only potentiates HPIP GEF activity is not fully delineated\", \"Structural mechanism of nucleotide exchange is unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identification of a RUFY3–MAP4–CDK1 axis in colorectal cancer, where RUFY3 knockdown induces PANoptosis, added a cell-death-regulatory dimension linking RUFY3 to microtubule-associated and cell-cycle proteins.\",\n      \"evidence\": \"Co-immunoprecipitation (Rufy3–MAP4, MAP4–CDK1), siRNA knockdown, mouse xenograft model\",\n      \"pmids\": [\"40879686\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding between RUFY3 and MAP4 not confirmed with recombinant proteins\", \"Whether the PANoptosis phenotype reflects a direct RUFY3 function or an indirect consequence of organelle mispositioning is unclear\", \"Single lab, limited mechanistic depth\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis for RUFY3's simultaneous engagement of multiple small GTPases (Arl8b, Rap2, Rab5, Rap1), how phosphoregulation at S34 intersects with its adapter and GEF functions, and whether the neuronal and immune isoforms share the same JIP4–dynein recruitment mechanism for organelle positioning.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of RUFY3 or any of its complexes\", \"Relative contributions of GEF vs. adapter functions to cell migration are undefined\", \"Isoform-specific interactome has not been comprehensively mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 5, 9, 11]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [9, 11, 12]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [9, 11]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [9, 11, 12]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [5, 12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [9, 11]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 10, 12]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 5, 6]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [11]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [6, 13]}\n    ],\n    \"complexes\": [\n      \"Arl8b–RUFY3–JIP4–dynein–dynactin\",\n      \"HPIP–RUFY3–Rab5 GEF complex\",\n      \"Rap2–RUFY3–Tiam2/STEF\"\n    ],\n    \"partners\": [\n      \"ARL8B\",\n      \"JIP4\",\n      \"RAP2A\",\n      \"TIAM2\",\n      \"HPIP\",\n      \"FSCN1\",\n      \"PAK1\",\n      \"FOXK1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}