{"gene":"RNF13","run_date":"2026-06-10T06:43:37","timeline":{"discoveries":[{"year":2009,"finding":"RNF13 is an ER/Golgi membrane-associated E3 ubiquitin ligase; its RING finger domain is required for ubiquitin ligase activity, and overexpression of wild-type but not RING domain-mutant RNF13 increases invasive potential and MMP-9 gelatinolytic activity in pancreatic cancer cells.","method":"In vitro ubiquitin ligase assay, RING domain mutagenesis, cell invasion/gelatin zymography assays","journal":"Cell Research","confidence":"High","confidence_rationale":"Tier 1/2 / Moderate — in vitro E3 ligase activity assay combined with mutagenesis and functional cell-based readout in a single focused study","pmids":["18794910"],"is_preprint":false},{"year":2009,"finding":"RNF13 E3 ligase activity (intact RING finger) is required for its growth-suppressive function in muscle cells; RING domain mutations abolish inhibition of myoblast proliferation and suppression of MyoD/Caveolin-3 expression. Myostatin upregulates RNF13 expression at transcriptional and translational levels.","method":"RING domain mutagenesis, ectopic expression, proliferation assays, RT-PCR/western blot","journal":"The FEBS Journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis plus functional cellular assay in a single focused study","pmids":["20015074"],"is_preprint":false},{"year":2010,"finding":"RNF13 localizes to endosomal membranes where it undergoes extensive proteasome-dependent proteolysis; the cytoplasmic RING-domain-containing fragment can be released from the membrane. Upon PKC activation, the full-length protein is stabilized and redistributes to recycling endosomes and the inner nuclear membrane, exposing the RING domain to the nucleoplasm.","method":"Subcellular fractionation, fluorescence microscopy, pharmacological PKC activation, proteasome inhibition","journal":"The FEBS Journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiments with functional/regulatory context, single lab, multiple methods","pmids":["21078126"],"is_preprint":false},{"year":2013,"finding":"RNF13 mediates ER stress-induced apoptosis upstream of the IRE1α–TRAF2–JNK signaling axis. RNF13 co-immunoprecipitates with IRE1α, and both the RING domain and transmembrane domain are required for JNK activation and apoptosis. Knockdown confers resistance to ER stress-induced apoptosis and JNK activation.","method":"Co-immunoprecipitation, genetic knockdown (retroviral insertion mutation screen), overexpression, caspase assays, knockdown epistasis panel","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, systematic epistasis knockdown panel, domain mutagenesis, multiple orthogonal readouts in a single rigorous study","pmids":["23378536"],"is_preprint":false},{"year":2013,"finding":"RNF13 interaction with IRE1α increases IRE1α protein stability (cycloheximide chase), promotes XBP1 mRNA splicing, and activates JNK in neuroblastoma SH-SY5Y cells, confirming a conserved role in ER stress-mediated apoptosis.","method":"Co-immunoprecipitation, cycloheximide chase, overexpression, RT-PCR, western blot","journal":"Journal of Receptor and Signal Transduction Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus cycloheximide stability assay in a second cell line, single lab","pmids":["24303962"],"is_preprint":false},{"year":2014,"finding":"The PA (protease-associated) domain of RNF13 is required for its endosomal localization. PA domain point mutations identified in human tumours retain E3 ligase activity but cause mislocalization of the protein, indicating that both catalytic activity and endosomal targeting are required for substrate ubiquitylation. RING domain tumour mutations abrogate ubiquitin ligase activity.","method":"PA domain mutagenesis, RING domain mutagenesis, ubiquitin ligase assays, fluorescence microscopy for localization","journal":"Biochemical Journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis combined with in vitro ligase assay and localization, single lab","pmids":["24387786"],"is_preprint":false},{"year":2012,"finding":"RNF13 directly interacts with snapin (a SNAP-25-interacting protein) and ubiquitinates snapin via K29-linked polyubiquitin chains, promoting snapin–SNAP-25 association and SNARE complex assembly. RNF13-null mice show impaired SNARE complex assembly and reduced snapin–SNAP-25 interaction, correlating with spatial learning deficits.","method":"Co-immunoprecipitation, in vitro ubiquitination assay with linkage determination, RNF13 knockout mouse, Morris water maze/Y-maze, electron microscopy of synapses","journal":"Cellular and Molecular Life Sciences","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro ubiquitination with K29-linkage identification, Co-IP, knockout mouse with defined cellular and behavioral phenotype","pmids":["22890573"],"is_preprint":false},{"year":2014,"finding":"RNF13 expressed in macrophages suppresses skeletal muscle regeneration; RNF13-knockout mice show accelerated satellite cell proliferation and elevated IL-4/IL-6 in injured muscle. Blocking IL-4/IL-6 with antibodies abrogates the accelerated regeneration phenotype, placing RNF13 upstream of cytokine-mediated satellite cell niche regulation.","method":"RNF13 knockout mouse, cardiotoxin injury model, cytokine multiplex, antibody blocking, immunofluorescence","journal":"Protein & Cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse with antibody rescue epistasis, single lab","pmids":["24563216"],"is_preprint":false},{"year":2015,"finding":"Host RNF13 reduces pulmonary colonization of metastatic tumor cells by maintaining GM-CSF levels in the lung; RNF13-knockout mice show reduced GM-CSF in tumor-bearing lungs and conditioned media from lung slices, correlating with enhanced metastatic foci.","method":"RNF13 knockout mouse, B16F10/LLC experimental metastasis model, cytokine ELISA, conditioned media experiments","journal":"Protein & Cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse with ELISA cytokine quantification, single lab","pmids":["26197965"],"is_preprint":false},{"year":2018,"finding":"Heterozygous gain-of-function variants in RNF13 (L311S, L312P) cause enhanced IRE1α-mediated stress signaling and increased stress-induced apoptosis in patient-derived cells, without altering RNF13 or IRE1α protein abundance. Structural modeling predicts surface location of variants without disrupting overall fold.","method":"Patient-derived cell lines, apoptosis assays, IRE1α signaling assays, structural modeling","journal":"American Journal of Human Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional assays in patient cells with defined gain-of-function mechanism; structural modeling is computational only","pmids":["30595371"],"is_preprint":false},{"year":2020,"finding":"RNF13 knockdown alleviates dopaminergic neuron damage and motor deficits in MPTP-induced Parkinson's disease mouse models and MPP+-treated SH-SY5Y cells by inhibiting the IRE1α–TRAF2–ASK1–JNK ER stress pathway, reducing apoptosis and Ca2+ elevation.","method":"shRNA knockdown in vivo and in vitro, western blot for pathway components, TUNEL/TH immunofluorescence, behavioral tests, Ca2+ measurement","journal":"Journal of Molecular Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD with pathway readout in both mouse model and cell line, single lab","pmids":["32617872"],"is_preprint":false},{"year":2021,"finding":"Disease-associated RNF13 variants L311S and L312P (dileucine motif) disrupt interaction with the AP-3 adaptor complex and endosomal/lysosomal localization, alter endosomal vesicle size, and affect EGF (but not transferrin) trafficking. Knockdown of AP-3 subunit AP3D1 similarly mislocalizes wild-type RNF13.","method":"GST-pulldown, co-immunoprecipitation, fluorescence microscopy, EGF/transferrin trafficking assays, AP3D1 knockdown","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal biochemical interaction assays plus functional trafficking readout, single lab","pmids":["34831286"],"is_preprint":false},{"year":2024,"finding":"RNF13 mediates K48-linked polyubiquitination of LAMP-1 at residue K128, targeting LAMP-1 for proteasomal degradation. This suppresses lysosome maturation and thereby delays TLR lysosomal degradation, promoting endosomal TLR-mediated inflammatory signaling in macrophages.","method":"E3 ligase screen (103 ligases), ubiquitination assays with linkage and site identification (K128), proteasome inhibition, lysosomal acidification assays, TLR signaling readouts, patient PBMCs","journal":"Advanced Science","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — site-specific ubiquitination (K128, K48-linkage) demonstrated biochemically, functional proteasome inhibition validation, inflammatory phenotype in macrophages, confirmed in patient samples","pmids":["39031743"],"is_preprint":false},{"year":2024,"finding":"A glutamine-based secondary motif in the C-terminal region of RNF13 binds AP-1 adaptor complex (distinct from the dileucine/AP-3 motif), providing an alternative Golgi-to-endosome trafficking route when the dileucine motif is mutated.","method":"Biochemical interaction assays, co-immunoprecipitation, fluorescence microscopy in HeLa cells, mutagenesis of sorting motifs","journal":"Journal of Cell Science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and localization with motif mutagenesis, single lab","pmids":["39206621"],"is_preprint":false},{"year":2023,"finding":"RNF13 directly interacts with p62 (co-immunoprecipitation, GST pulldown) and promotes activation of the p62–NRF2–HO-1 signaling axis to protect against cardiac hypertrophy; p62 knockdown reverses the cardioprotective effect of RNF13 overexpression.","method":"Co-immunoprecipitation, GST-pulldown, RNF13 knockout and AAV9-overexpression mouse models, TAC cardiac hypertrophy model, RNA-seq, p62 knockdown epistasis","journal":"Free Radical Biology & Medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical interaction plus KO/OE mouse with epistasis knockdown, single lab","pmids":["37852547"],"is_preprint":false},{"year":2024,"finding":"RNF13 protects neurons against ischemia-reperfusion injury by interacting with p62 (co-immunoprecipitation, GST-pulldown) and blocking TRIM21-mediated autophagy-dependent degradation of p62, thereby stabilizing p62–NRF2–HO-1 signaling and reducing apoptosis and inflammation.","method":"CRISPR/Cas9 knockout mice, co-immunoprecipitation, GST-pulldown, mass spectrometry, RNA-seq, immunofluorescence, I/R injury model","journal":"Cell Communication and Signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical interaction, KO mouse with disease model, mass spectrometry substrate identification, single lab","pmids":["39511649"],"is_preprint":false},{"year":2025,"finding":"RNF13 regulates lysosomal positioning through pH- and Ca2+-dependent mechanisms: elevated intracellular pH deprotonates RNF13 at His332, enabling interaction with Ca2+-bound ALG-2, which activates RNF13 to ubiquitinate and degrade ARL8B, thereby inhibiting ARL8B-mediated anterograde lysosomal transport. Alkaline extracellular pH activates TRPML3 to increase lysosomal Ca2+, further enhancing RNF13 activity and driving perinuclear lysosomal positioning.","method":"His332 mutagenesis, co-immunoprecipitation of RNF13-ALG-2, ubiquitination assays for ARL8B, lysosomal positioning microscopy, TRPML3 channel pharmacology, pH manipulation","journal":"Cell Reports","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — site-specific mutagenesis (His332) combined with biochemical interaction and ubiquitination assays and functional lysosomal positioning readout in a single study; published peer-reviewed","pmids":["40714633"],"is_preprint":false},{"year":2025,"finding":"RNF13 binds the small GTPase Arl8B (via Arl8B residues Glu22 and Phe55 and RNF13 residue Leu244), with modest preference for GDP-bound Arl8B. Disrupting this interaction redistributes lysosomes to the cell periphery and delays EGFR trafficking toward lysosomal degradation without affecting general endocytosis.","method":"AlphaFold structural modeling, co-immunoprecipitation, mutagenesis of interface residues, lysosomal positioning microscopy, EGFR trafficking assays","journal":"The FEBS Journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with mutagenesis and functional trafficking readout, structural prediction used to guide experiments, single lab","pmids":["42206902"],"is_preprint":false},{"year":2025,"finding":"RNF13 interacts with iduronate 2-sulfatase (IDS), preferentially binding an underglycosylated immature form, and its E3 ligase catalytic activity is required to generate this underglycosylated IDS form (which is otherwise rapidly degraded by the proteasome); RNF13 exerts a net protective effect on IDS. RNF13 forms a heterodimer with RNF167, altering both proteins' lysosomal trafficking and modifying IDS processing differently than either E3 ligase alone.","method":"Co-immunoprecipitation, AlphaFold3 prediction, western blot glycosylation analysis, E3 ligase mutants, proteasome inhibition, site-directed mutagenesis (Asn246)","journal":"The FEBS Journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with catalytic mutant and glycosylation analysis, single lab, peer-reviewed publication","pmids":["41387381"],"is_preprint":false},{"year":2025,"finding":"RNF13 variants L311S and L312P are trafficked through an AP-1-dependent pathway in neurons and accumulate at higher levels in dendrites than wild-type RNF13. These variants alter early endosome (EEA1+) distribution in dendrites, reduce distal lysosome (Lamp1+) presence, fail to increase PSD-95 in distal dendrites, and decrease total Gephyrin puncta, acting primarily as dominant negatives for AP-3-dependent ubiquitin ligase function.","method":"Primary rat hippocampal neuron culture, fluorescence microscopy, dominant-negative constructs, AP-3 defective binding variants","journal":"IBRO Neuroscience Reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct imaging in primary neurons with multiple endosomal markers and synaptic readouts, dominant negative approach, single lab","pmids":["40276023"],"is_preprint":false}],"current_model":"RNF13 is an endolysosomal membrane-anchored RING-type E3 ubiquitin ligase that (1) mediates ER stress-induced apoptosis by interacting with and stabilizing IRE1α to activate the IRE1α–TRAF2–(ASK1)–JNK axis; (2) ubiquitinates snapin via K29-linked chains to promote SNARE complex assembly and synaptic function; (3) ubiquitinates LAMP-1 (K48-linked, at K128) for proteasomal degradation to suppress lysosome maturation and sustain endosomal TLR signaling; (4) regulates lysosomal positioning through pH- and Ca2+-dependent interaction with ALG-2 and ubiquitin-dependent degradation of ARL8B; (5) traffics to endolysosomes via a dileucine/AP-3 motif and a secondary glutamine/AP-1 motif; (6) interacts with p62 to stabilize the NRF2/HO-1 antioxidant pathway; and (7) forms heterodimers with RNF167 to modulate lysosomal trafficking and substrate (IDS) processing."},"narrative":{"mechanistic_narrative":"RNF13 is an endolysosomal membrane-anchored RING-type E3 ubiquitin ligase whose catalytic activity and correct subcellular targeting jointly govern its roles in ER stress signaling, lysosomal biology, and synaptic function [PMID:18794910, PMID:24387786]. Through its RING domain it functions as a bona fide E3 ligase, with intact catalytic activity required for its cellular effects [PMID:18794910, PMID:24387786]. RNF13 acts as a key effector of ER stress-induced apoptosis: it co-immunoprecipitates with and stabilizes IRE1α, activating the IRE1α–TRAF2–(ASK1)–JNK axis and XBP1 splicing, with both the RING and transmembrane domains required [PMID:23378536, PMID:24303962]. At endolysosomes, RNF13 directs membrane and trafficking outcomes through substrate ubiquitination: it mediates K48-linked ubiquitination of LAMP-1 at K128 to drive its proteasomal degradation, suppressing lysosome maturation and sustaining endosomal TLR-mediated inflammation [PMID:39031743], and it controls lysosomal positioning by a pH- and Ca2+-dependent mechanism in which His332 deprotonation enables binding to Ca2+-bound ALG-2 and ubiquitin-dependent degradation of ARL8B, opposing anterograde lysosomal transport [PMID:40714633, PMID:42206902]. RNF13 is targeted to endolysosomes via a dileucine/AP-3 sorting motif, with a secondary glutamine/AP-1 motif providing an alternative Golgi-to-endosome route [PMID:34831286, PMID:39206621], and its PA domain is independently required for endosomal localization [PMID:24387786]. It additionally ubiquitinates snapin via K29-linked chains to promote SNARE complex assembly and synaptic function [PMID:22890573] and interacts with p62 to stabilize NRF2/HO-1 antioxidant signaling [PMID:37852547, PMID:39511649]. Heterozygous gain-of-function RNF13 variants (L311S, L312P) cause a human neurodevelopmental disorder, enhancing IRE1α-mediated stress apoptosis while disrupting AP-3 binding and endolysosomal localization [PMID:30595371, PMID:34831286].","teleology":[{"year":2009,"claim":"Established RNF13 as a catalytically active RING E3 ligase whose activity drives cellular phenotypes, answering whether the protein has intrinsic ubiquitin ligase function.","evidence":"In vitro ubiquitin ligase assay with RING-domain mutagenesis and cell invasion/zymography readouts in pancreatic cancer cells; parallel growth-suppression assays in muscle cells","pmids":["18794910","20015074"],"confidence":"High","gaps":["No physiological substrate identified at this stage","Mechanism linking ligase activity to MMP-9 activity and invasion unresolved"]},{"year":2010,"claim":"Defined RNF13 as an endosomal membrane protein subject to regulated proteolysis and PKC-dependent redistribution, framing its activity as spatially controlled.","evidence":"Subcellular fractionation, fluorescence microscopy, pharmacological PKC activation and proteasome inhibition","pmids":["21078126"],"confidence":"Medium","gaps":["Functional consequence of nuclear RING exposure not established","Identity of proteases generating cytoplasmic fragment unknown"]},{"year":2012,"claim":"Identified snapin as the first defined RNF13 substrate and linked K29-linked ubiquitination to SNARE assembly and learning, establishing a synaptic role.","evidence":"Co-IP, in vitro ubiquitination with K29-linkage determination, RNF13 knockout mice with behavioral and synaptic ultrastructure analysis","pmids":["22890573"],"confidence":"High","gaps":["How non-degradative K29 ubiquitination promotes snapin–SNAP-25 association mechanistically unclear","Relationship to endolysosomal localization not addressed"]},{"year":2013,"claim":"Placed RNF13 upstream of the IRE1α–TRAF2–JNK axis in ER stress apoptosis by showing it binds and stabilizes IRE1α, defining a signaling rather than purely degradative role.","evidence":"Reciprocal Co-IP, retroviral insertion knockdown epistasis panel, domain mutagenesis, cycloheximide chase, XBP1 splicing and caspase assays across cell lines","pmids":["23378536","24303962"],"confidence":"High","gaps":["Whether IRE1α stabilization requires RNF13 catalytic ubiquitination not resolved","Direct ubiquitination of IRE1α not demonstrated"]},{"year":2014,"claim":"Showed that endosomal targeting and catalytic activity are separable but both required, with the PA domain controlling localization and tumour mutations dissociating these properties.","evidence":"PA- and RING-domain mutagenesis, in vitro ligase assays, localization microscopy","pmids":["24387786"],"confidence":"Medium","gaps":["PA domain binding partner mediating localization unknown","Substrates ubiquitinated specifically at the endosome not yet defined"]},{"year":2015,"claim":"Extended RNF13 function to organismal immune-niche regulation, showing knockout alters cytokine milieu (IL-4/IL-6, GM-CSF) affecting muscle regeneration and metastatic colonization.","evidence":"RNF13 knockout mice with cardiotoxin injury and experimental metastasis models, cytokine multiplex/ELISA, antibody-blocking epistasis","pmids":["24563216","26197965"],"confidence":"Medium","gaps":["Molecular substrate linking RNF13 to cytokine production unidentified","Cell-type-specific mechanism in macrophages not resolved"]},{"year":2018,"claim":"Linked RNF13 to human disease, showing heterozygous L311S/L312P variants act as gain-of-function alleles enhancing IRE1α stress signaling and apoptosis.","evidence":"Patient-derived cell lines, apoptosis and IRE1α signaling assays, computational structural modeling","pmids":["30595371"],"confidence":"Medium","gaps":["Structural prediction is computational only","How surface variants enhance signaling mechanistically unresolved"]},{"year":2021,"claim":"Reframed the disease variants as trafficking defects, showing the L311/L312 dileucine motif mediates AP-3 binding required for endolysosomal localization and selective cargo trafficking.","evidence":"GST-pulldown, Co-IP, AP3D1 knockdown, EGF/transferrin trafficking and vesicle-size microscopy","pmids":["34831286"],"confidence":"Medium","gaps":["Reconciliation between gain-of-function signaling and loss-of-localization not fully resolved","Cargo selectivity (EGF vs transferrin) mechanism unclear"]},{"year":2024,"claim":"Identified LAMP-1 as a site-specific K48-linked substrate, mechanistically connecting RNF13 to suppression of lysosome maturation and sustained TLR inflammation.","evidence":"E3 ligase screen, site- and linkage-specific ubiquitination assays (K128, K48), proteasome inhibition, lysosomal acidification and TLR readouts, patient PBMCs","pmids":["39031743"],"confidence":"High","gaps":["How proteasomal degradation of a lysosomal membrane protein occurs mechanistically not fully detailed","Link to RNF13 disease variants not established"]},{"year":2024,"claim":"Resolved RNF13 trafficking logic by identifying a secondary glutamine/AP-1 motif providing an alternative Golgi-to-endosome route independent of the dileucine/AP-3 motif.","evidence":"Biochemical interaction assays, Co-IP, sorting-motif mutagenesis and microscopy in HeLa cells","pmids":["39206621"],"confidence":"Medium","gaps":["Conditions selecting AP-1 vs AP-3 routing in vivo unknown","Functional consequence of alternate routing for substrate ubiquitination not defined"]},{"year":2024,"claim":"Defined a cytoprotective antioxidant arm in which RNF13 binds p62 and stabilizes the p62–NRF2–HO-1 axis, including by blocking TRIM21-mediated p62 degradation.","evidence":"Co-IP, GST-pulldown, mass spectrometry, RNA-seq, KO/AAV9-overexpression mice in cardiac hypertrophy and cerebral I/R models with p62-knockdown epistasis","pmids":["37852547","39511649"],"confidence":"Medium","gaps":["Whether p62 stabilization requires RNF13 catalytic activity unclear","Direct molecular interplay with TRIM21 not fully mapped"]},{"year":2025,"claim":"Established RNF13 as a pH/Ca2+-gated regulator of lysosomal positioning, coupling His332 deprotonation and ALG-2 binding to ubiquitin-dependent ARL8B/Arl8B control of lysosomal transport.","evidence":"His332 and interface-residue mutagenesis, Co-IP of RNF13–ALG-2 and RNF13–Arl8B, ARL8B ubiquitination assays, TRPML3 pharmacology, AlphaFold modeling, lysosomal positioning and EGFR trafficking microscopy","pmids":["40714633","42206902"],"confidence":"High","gaps":["Integration of ALG-2 activation with Arl8B GDP-preference binding not fully unified","In vivo relevance of pH-gated positioning unestablished"]},{"year":2025,"claim":"Showed RNF13 functions within a heterodimer with RNF167 and modulates IDS maturation, indicating combinatorial E3 activity shapes lysosomal enzyme processing.","evidence":"Co-IP, AlphaFold3 prediction, glycosylation/western analysis, E3 catalytic mutants, proteasome inhibition, Asn246 mutagenesis","pmids":["41387381"],"confidence":"Medium","gaps":["Mechanism by which the heterodimer alters IDS processing not resolved","Substrate specificity changes upon dimerization not mapped"]},{"year":2025,"claim":"Clarified the disease variants' neuronal mechanism, showing L311S/L312P reroute via AP-1, mislocalize in dendrites, and act as dominant negatives for AP-3-dependent ligase function affecting synaptic markers.","evidence":"Primary rat hippocampal neuron imaging with endosomal/synaptic markers and dominant-negative constructs","pmids":["40276023"],"confidence":"Medium","gaps":["Reconciliation of dominant-negative trafficking with gain-of-function ER stress signaling unresolved","Substrate(s) underlying synaptic marker changes unidentified"]},{"year":null,"claim":"How RNF13's distinct activities — IRE1α signaling, snapin/SNARE, LAMP-1/lysosome maturation, ALG-2/ARL8B positioning, p62/NRF2, and IDS/RNF167 — are coordinated within a single endolysosomal ligase, and how disease variants simultaneously gain ER-stress signaling while losing trafficking-dependent functions, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking signaling and trafficking arms","Spatial/temporal control of substrate choice unknown","Comprehensive substrate map incomplete"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,5,6,12,16]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[6,12,16,18]},{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[0,5,12]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[16]}],"localization":[{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[2,5,11]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[12,16,17]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[0,13]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[0,3]}],"pathway":[{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[3,4,9,10]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[3,10,15]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[11,12,16,17]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[12]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[12,18]}],"complexes":["RNF13-RNF167 heterodimer"],"partners":["IRE1A","SNAPIN","LAMP1","ALG2","ARL8B","SQSTM1","RNF167","IDS"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O43567","full_name":"E3 ubiquitin-protein ligase RNF13","aliases":["RING finger protein 13"],"length_aa":381,"mass_kda":42.8,"function":"E3 ubiquitin-protein ligase that regulates cell proliferation (PubMed:18794910, PubMed:23378536, PubMed:30595371). Involved in apoptosis regulation (PubMed:23378536, PubMed:30595371). Mediates ER stress-induced activation of JNK signaling pathway and apoptosis by promoting ERN1 activation and splicing of XBP1 mRNA (PubMed:23378536, PubMed:30595371). Also involved in protein trafficking and localization (PubMed:24387786)","subcellular_location":"Endoplasmic reticulum membrane; Late endosome membrane; Lysosome membrane; Nucleus inner membrane","url":"https://www.uniprot.org/uniprotkb/O43567/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RNF13","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CHEK1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/RNF13","total_profiled":1310},"omim":[{"mim_id":"618379","title":"DEVELOPMENTAL AND EPILEPTIC ENCEPHALOPATHY 73; DEE73","url":"https://www.omim.org/entry/618379"},{"mim_id":"609247","title":"RING FINGER PROTEIN 13; RNF13","url":"https://www.omim.org/entry/609247"},{"mim_id":"308350","title":"DEVELOPMENTAL AND EPILEPTIC ENCEPHALOPATHY 1; DEE1","url":"https://www.omim.org/entry/308350"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Vesicles","reliability":"Supported"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/RNF13"},"hgnc":{"alias_symbol":["RZF"],"prev_symbol":[]},"alphafold":{"accession":"O43567","domains":[{"cath_id":"3.50.30.30","chopping":"32-171","consensus_level":"high","plddt":91.3311,"start":32,"end":171},{"cath_id":"3.30.40.10","chopping":"218-273","consensus_level":"high","plddt":88.8593,"start":218,"end":273}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O43567","model_url":"https://alphafold.ebi.ac.uk/files/AF-O43567-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O43567-F1-predicted_aligned_error_v6.png","plddt_mean":74.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RNF13","jax_strain_url":"https://www.jax.org/strain/search?query=RNF13"},"sequence":{"accession":"O43567","fasta_url":"https://rest.uniprot.org/uniprotkb/O43567.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O43567/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O43567"}},"corpus_meta":[{"pmid":"18794910","id":"PMC_18794910","title":"RNF13: a novel RING-type ubiquitin ligase over-expressed in pancreatic cancer.","date":"2009","source":"Cell research","url":"https://pubmed.ncbi.nlm.nih.gov/18794910","citation_count":61,"is_preprint":false},{"pmid":"23378536","id":"PMC_23378536","title":"RNF13, a RING finger protein, mediates endoplasmic reticulum stress-induced apoptosis through the inositol-requiring enzyme (IRE1α)/c-Jun NH2-terminal kinase pathway.","date":"2013","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/23378536","citation_count":50,"is_preprint":false},{"pmid":"8610176","id":"PMC_8610176","title":"Identification and characterization of a RING zinc finger gene (C-RZF) expressed in chicken embryo cells.","date":"1996","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/8610176","citation_count":34,"is_preprint":false},{"pmid":"21078127","id":"PMC_21078127","title":"RNF13: an emerging RING finger 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Myostatin upregulates RNF13 expression at transcriptional and translational levels.\",\n      \"method\": \"RING domain mutagenesis, ectopic expression, proliferation assays, RT-PCR/western blot\",\n      \"journal\": \"The FEBS Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis plus functional cellular assay in a single focused study\",\n      \"pmids\": [\"20015074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RNF13 localizes to endosomal membranes where it undergoes extensive proteasome-dependent proteolysis; the cytoplasmic RING-domain-containing fragment can be released from the membrane. Upon PKC activation, the full-length protein is stabilized and redistributes to recycling endosomes and the inner nuclear membrane, exposing the RING domain to the nucleoplasm.\",\n      \"method\": \"Subcellular fractionation, fluorescence microscopy, pharmacological PKC activation, proteasome inhibition\",\n      \"journal\": \"The FEBS Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiments with functional/regulatory context, single lab, multiple methods\",\n      \"pmids\": [\"21078126\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RNF13 mediates ER stress-induced apoptosis upstream of the IRE1α–TRAF2–JNK signaling axis. RNF13 co-immunoprecipitates with IRE1α, and both the RING domain and transmembrane domain are required for JNK activation and apoptosis. Knockdown confers resistance to ER stress-induced apoptosis and JNK activation.\",\n      \"method\": \"Co-immunoprecipitation, genetic knockdown (retroviral insertion mutation screen), overexpression, caspase assays, knockdown epistasis panel\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, systematic epistasis knockdown panel, domain mutagenesis, multiple orthogonal readouts in a single rigorous study\",\n      \"pmids\": [\"23378536\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RNF13 interaction with IRE1α increases IRE1α protein stability (cycloheximide chase), promotes XBP1 mRNA splicing, and activates JNK in neuroblastoma SH-SY5Y cells, confirming a conserved role in ER stress-mediated apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, cycloheximide chase, overexpression, RT-PCR, western blot\",\n      \"journal\": \"Journal of Receptor and Signal Transduction Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus cycloheximide stability assay in a second cell line, single lab\",\n      \"pmids\": [\"24303962\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The PA (protease-associated) domain of RNF13 is required for its endosomal localization. PA domain point mutations identified in human tumours retain E3 ligase activity but cause mislocalization of the protein, indicating that both catalytic activity and endosomal targeting are required for substrate ubiquitylation. RING domain tumour mutations abrogate ubiquitin ligase activity.\",\n      \"method\": \"PA domain mutagenesis, RING domain mutagenesis, ubiquitin ligase assays, fluorescence microscopy for localization\",\n      \"journal\": \"Biochemical Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis combined with in vitro ligase assay and localization, single lab\",\n      \"pmids\": [\"24387786\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RNF13 directly interacts with snapin (a SNAP-25-interacting protein) and ubiquitinates snapin via K29-linked polyubiquitin chains, promoting snapin–SNAP-25 association and SNARE complex assembly. RNF13-null mice show impaired SNARE complex assembly and reduced snapin–SNAP-25 interaction, correlating with spatial learning deficits.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay with linkage determination, RNF13 knockout mouse, Morris water maze/Y-maze, electron microscopy of synapses\",\n      \"journal\": \"Cellular and Molecular Life Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro ubiquitination with K29-linkage identification, Co-IP, knockout mouse with defined cellular and behavioral phenotype\",\n      \"pmids\": [\"22890573\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RNF13 expressed in macrophages suppresses skeletal muscle regeneration; RNF13-knockout mice show accelerated satellite cell proliferation and elevated IL-4/IL-6 in injured muscle. Blocking IL-4/IL-6 with antibodies abrogates the accelerated regeneration phenotype, placing RNF13 upstream of cytokine-mediated satellite cell niche regulation.\",\n      \"method\": \"RNF13 knockout mouse, cardiotoxin injury model, cytokine multiplex, antibody blocking, immunofluorescence\",\n      \"journal\": \"Protein & Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse with antibody rescue epistasis, single lab\",\n      \"pmids\": [\"24563216\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Host RNF13 reduces pulmonary colonization of metastatic tumor cells by maintaining GM-CSF levels in the lung; RNF13-knockout mice show reduced GM-CSF in tumor-bearing lungs and conditioned media from lung slices, correlating with enhanced metastatic foci.\",\n      \"method\": \"RNF13 knockout mouse, B16F10/LLC experimental metastasis model, cytokine ELISA, conditioned media experiments\",\n      \"journal\": \"Protein & Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse with ELISA cytokine quantification, single lab\",\n      \"pmids\": [\"26197965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Heterozygous gain-of-function variants in RNF13 (L311S, L312P) cause enhanced IRE1α-mediated stress signaling and increased stress-induced apoptosis in patient-derived cells, without altering RNF13 or IRE1α protein abundance. Structural modeling predicts surface location of variants without disrupting overall fold.\",\n      \"method\": \"Patient-derived cell lines, apoptosis assays, IRE1α signaling assays, structural modeling\",\n      \"journal\": \"American Journal of Human Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional assays in patient cells with defined gain-of-function mechanism; structural modeling is computational only\",\n      \"pmids\": [\"30595371\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RNF13 knockdown alleviates dopaminergic neuron damage and motor deficits in MPTP-induced Parkinson's disease mouse models and MPP+-treated SH-SY5Y cells by inhibiting the IRE1α–TRAF2–ASK1–JNK ER stress pathway, reducing apoptosis and Ca2+ elevation.\",\n      \"method\": \"shRNA knockdown in vivo and in vitro, western blot for pathway components, TUNEL/TH immunofluorescence, behavioral tests, Ca2+ measurement\",\n      \"journal\": \"Journal of Molecular Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD with pathway readout in both mouse model and cell line, single lab\",\n      \"pmids\": [\"32617872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Disease-associated RNF13 variants L311S and L312P (dileucine motif) disrupt interaction with the AP-3 adaptor complex and endosomal/lysosomal localization, alter endosomal vesicle size, and affect EGF (but not transferrin) trafficking. Knockdown of AP-3 subunit AP3D1 similarly mislocalizes wild-type RNF13.\",\n      \"method\": \"GST-pulldown, co-immunoprecipitation, fluorescence microscopy, EGF/transferrin trafficking assays, AP3D1 knockdown\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal biochemical interaction assays plus functional trafficking readout, single lab\",\n      \"pmids\": [\"34831286\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RNF13 mediates K48-linked polyubiquitination of LAMP-1 at residue K128, targeting LAMP-1 for proteasomal degradation. This suppresses lysosome maturation and thereby delays TLR lysosomal degradation, promoting endosomal TLR-mediated inflammatory signaling in macrophages.\",\n      \"method\": \"E3 ligase screen (103 ligases), ubiquitination assays with linkage and site identification (K128), proteasome inhibition, lysosomal acidification assays, TLR signaling readouts, patient PBMCs\",\n      \"journal\": \"Advanced Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — site-specific ubiquitination (K128, K48-linkage) demonstrated biochemically, functional proteasome inhibition validation, inflammatory phenotype in macrophages, confirmed in patient samples\",\n      \"pmids\": [\"39031743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"A glutamine-based secondary motif in the C-terminal region of RNF13 binds AP-1 adaptor complex (distinct from the dileucine/AP-3 motif), providing an alternative Golgi-to-endosome trafficking route when the dileucine motif is mutated.\",\n      \"method\": \"Biochemical interaction assays, co-immunoprecipitation, fluorescence microscopy in HeLa cells, mutagenesis of sorting motifs\",\n      \"journal\": \"Journal of Cell Science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and localization with motif mutagenesis, single lab\",\n      \"pmids\": [\"39206621\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"RNF13 directly interacts with p62 (co-immunoprecipitation, GST pulldown) and promotes activation of the p62–NRF2–HO-1 signaling axis to protect against cardiac hypertrophy; p62 knockdown reverses the cardioprotective effect of RNF13 overexpression.\",\n      \"method\": \"Co-immunoprecipitation, GST-pulldown, RNF13 knockout and AAV9-overexpression mouse models, TAC cardiac hypertrophy model, RNA-seq, p62 knockdown epistasis\",\n      \"journal\": \"Free Radical Biology & Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical interaction plus KO/OE mouse with epistasis knockdown, single lab\",\n      \"pmids\": [\"37852547\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RNF13 protects neurons against ischemia-reperfusion injury by interacting with p62 (co-immunoprecipitation, GST-pulldown) and blocking TRIM21-mediated autophagy-dependent degradation of p62, thereby stabilizing p62–NRF2–HO-1 signaling and reducing apoptosis and inflammation.\",\n      \"method\": \"CRISPR/Cas9 knockout mice, co-immunoprecipitation, GST-pulldown, mass spectrometry, RNA-seq, immunofluorescence, I/R injury model\",\n      \"journal\": \"Cell Communication and Signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical interaction, KO mouse with disease model, mass spectrometry substrate identification, single lab\",\n      \"pmids\": [\"39511649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RNF13 regulates lysosomal positioning through pH- and Ca2+-dependent mechanisms: elevated intracellular pH deprotonates RNF13 at His332, enabling interaction with Ca2+-bound ALG-2, which activates RNF13 to ubiquitinate and degrade ARL8B, thereby inhibiting ARL8B-mediated anterograde lysosomal transport. Alkaline extracellular pH activates TRPML3 to increase lysosomal Ca2+, further enhancing RNF13 activity and driving perinuclear lysosomal positioning.\",\n      \"method\": \"His332 mutagenesis, co-immunoprecipitation of RNF13-ALG-2, ubiquitination assays for ARL8B, lysosomal positioning microscopy, TRPML3 channel pharmacology, pH manipulation\",\n      \"journal\": \"Cell Reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — site-specific mutagenesis (His332) combined with biochemical interaction and ubiquitination assays and functional lysosomal positioning readout in a single study; published peer-reviewed\",\n      \"pmids\": [\"40714633\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RNF13 binds the small GTPase Arl8B (via Arl8B residues Glu22 and Phe55 and RNF13 residue Leu244), with modest preference for GDP-bound Arl8B. Disrupting this interaction redistributes lysosomes to the cell periphery and delays EGFR trafficking toward lysosomal degradation without affecting general endocytosis.\",\n      \"method\": \"AlphaFold structural modeling, co-immunoprecipitation, mutagenesis of interface residues, lysosomal positioning microscopy, EGFR trafficking assays\",\n      \"journal\": \"The FEBS Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with mutagenesis and functional trafficking readout, structural prediction used to guide experiments, single lab\",\n      \"pmids\": [\"42206902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RNF13 interacts with iduronate 2-sulfatase (IDS), preferentially binding an underglycosylated immature form, and its E3 ligase catalytic activity is required to generate this underglycosylated IDS form (which is otherwise rapidly degraded by the proteasome); RNF13 exerts a net protective effect on IDS. RNF13 forms a heterodimer with RNF167, altering both proteins' lysosomal trafficking and modifying IDS processing differently than either E3 ligase alone.\",\n      \"method\": \"Co-immunoprecipitation, AlphaFold3 prediction, western blot glycosylation analysis, E3 ligase mutants, proteasome inhibition, site-directed mutagenesis (Asn246)\",\n      \"journal\": \"The FEBS Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with catalytic mutant and glycosylation analysis, single lab, peer-reviewed publication\",\n      \"pmids\": [\"41387381\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RNF13 variants L311S and L312P are trafficked through an AP-1-dependent pathway in neurons and accumulate at higher levels in dendrites than wild-type RNF13. These variants alter early endosome (EEA1+) distribution in dendrites, reduce distal lysosome (Lamp1+) presence, fail to increase PSD-95 in distal dendrites, and decrease total Gephyrin puncta, acting primarily as dominant negatives for AP-3-dependent ubiquitin ligase function.\",\n      \"method\": \"Primary rat hippocampal neuron culture, fluorescence microscopy, dominant-negative constructs, AP-3 defective binding variants\",\n      \"journal\": \"IBRO Neuroscience Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct imaging in primary neurons with multiple endosomal markers and synaptic readouts, dominant negative approach, single lab\",\n      \"pmids\": [\"40276023\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RNF13 is an endolysosomal membrane-anchored RING-type E3 ubiquitin ligase that (1) mediates ER stress-induced apoptosis by interacting with and stabilizing IRE1α to activate the IRE1α–TRAF2–(ASK1)–JNK axis; (2) ubiquitinates snapin via K29-linked chains to promote SNARE complex assembly and synaptic function; (3) ubiquitinates LAMP-1 (K48-linked, at K128) for proteasomal degradation to suppress lysosome maturation and sustain endosomal TLR signaling; (4) regulates lysosomal positioning through pH- and Ca2+-dependent interaction with ALG-2 and ubiquitin-dependent degradation of ARL8B; (5) traffics to endolysosomes via a dileucine/AP-3 motif and a secondary glutamine/AP-1 motif; (6) interacts with p62 to stabilize the NRF2/HO-1 antioxidant pathway; and (7) forms heterodimers with RNF167 to modulate lysosomal trafficking and substrate (IDS) processing.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RNF13 is an endolysosomal membrane-anchored RING-type E3 ubiquitin ligase whose catalytic activity and correct subcellular targeting jointly govern its roles in ER stress signaling, lysosomal biology, and synaptic function [#0, #5]. Through its RING domain it functions as a bona fide E3 ligase, with intact catalytic activity required for its cellular effects [#0, #5]. RNF13 acts as a key effector of ER stress-induced apoptosis: it co-immunoprecipitates with and stabilizes IRE1\\u03b1, activating the IRE1\\u03b1\\u2013TRAF2\\u2013(ASK1)\\u2013JNK axis and XBP1 splicing, with both the RING and transmembrane domains required [#3, #4]. At endolysosomes, RNF13 directs membrane and trafficking outcomes through substrate ubiquitination: it mediates K48-linked ubiquitination of LAMP-1 at K128 to drive its proteasomal degradation, suppressing lysosome maturation and sustaining endosomal TLR-mediated inflammation [#12], and it controls lysosomal positioning by a pH- and Ca2+-dependent mechanism in which His332 deprotonation enables binding to Ca2+-bound ALG-2 and ubiquitin-dependent degradation of ARL8B, opposing anterograde lysosomal transport [#16, #17]. RNF13 is targeted to endolysosomes via a dileucine/AP-3 sorting motif, with a secondary glutamine/AP-1 motif providing an alternative Golgi-to-endosome route [#11, #13], and its PA domain is independently required for endosomal localization [#5]. It additionally ubiquitinates snapin via K29-linked chains to promote SNARE complex assembly and synaptic function [#6] and interacts with p62 to stabilize NRF2/HO-1 antioxidant signaling [#14, #15]. Heterozygous gain-of-function RNF13 variants (L311S, L312P) cause a human neurodevelopmental disorder, enhancing IRE1\\u03b1-mediated stress apoptosis while disrupting AP-3 binding and endolysosomal localization [#9, #11].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Established RNF13 as a catalytically active RING E3 ligase whose activity drives cellular phenotypes, answering whether the protein has intrinsic ubiquitin ligase function.\",\n      \"evidence\": \"In vitro ubiquitin ligase assay with RING-domain mutagenesis and cell invasion/zymography readouts in pancreatic cancer cells; parallel growth-suppression assays in muscle cells\",\n      \"pmids\": [\"18794910\", \"20015074\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No physiological substrate identified at this stage\", \"Mechanism linking ligase activity to MMP-9 activity and invasion unresolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined RNF13 as an endosomal membrane protein subject to regulated proteolysis and PKC-dependent redistribution, framing its activity as spatially controlled.\",\n      \"evidence\": \"Subcellular fractionation, fluorescence microscopy, pharmacological PKC activation and proteasome inhibition\",\n      \"pmids\": [\"21078126\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of nuclear RING exposure not established\", \"Identity of proteases generating cytoplasmic fragment unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified snapin as the first defined RNF13 substrate and linked K29-linked ubiquitination to SNARE assembly and learning, establishing a synaptic role.\",\n      \"evidence\": \"Co-IP, in vitro ubiquitination with K29-linkage determination, RNF13 knockout mice with behavioral and synaptic ultrastructure analysis\",\n      \"pmids\": [\"22890573\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How non-degradative K29 ubiquitination promotes snapin\\u2013SNAP-25 association mechanistically unclear\", \"Relationship to endolysosomal localization not addressed\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Placed RNF13 upstream of the IRE1\\u03b1\\u2013TRAF2\\u2013JNK axis in ER stress apoptosis by showing it binds and stabilizes IRE1\\u03b1, defining a signaling rather than purely degradative role.\",\n      \"evidence\": \"Reciprocal Co-IP, retroviral insertion knockdown epistasis panel, domain mutagenesis, cycloheximide chase, XBP1 splicing and caspase assays across cell lines\",\n      \"pmids\": [\"23378536\", \"24303962\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether IRE1\\u03b1 stabilization requires RNF13 catalytic ubiquitination not resolved\", \"Direct ubiquitination of IRE1\\u03b1 not demonstrated\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed that endosomal targeting and catalytic activity are separable but both required, with the PA domain controlling localization and tumour mutations dissociating these properties.\",\n      \"evidence\": \"PA- and RING-domain mutagenesis, in vitro ligase assays, localization microscopy\",\n      \"pmids\": [\"24387786\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"PA domain binding partner mediating localization unknown\", \"Substrates ubiquitinated specifically at the endosome not yet defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Extended RNF13 function to organismal immune-niche regulation, showing knockout alters cytokine milieu (IL-4/IL-6, GM-CSF) affecting muscle regeneration and metastatic colonization.\",\n      \"evidence\": \"RNF13 knockout mice with cardiotoxin injury and experimental metastasis models, cytokine multiplex/ELISA, antibody-blocking epistasis\",\n      \"pmids\": [\"24563216\", \"26197965\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular substrate linking RNF13 to cytokine production unidentified\", \"Cell-type-specific mechanism in macrophages not resolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Linked RNF13 to human disease, showing heterozygous L311S/L312P variants act as gain-of-function alleles enhancing IRE1\\u03b1 stress signaling and apoptosis.\",\n      \"evidence\": \"Patient-derived cell lines, apoptosis and IRE1\\u03b1 signaling assays, computational structural modeling\",\n      \"pmids\": [\"30595371\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural prediction is computational only\", \"How surface variants enhance signaling mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Reframed the disease variants as trafficking defects, showing the L311/L312 dileucine motif mediates AP-3 binding required for endolysosomal localization and selective cargo trafficking.\",\n      \"evidence\": \"GST-pulldown, Co-IP, AP3D1 knockdown, EGF/transferrin trafficking and vesicle-size microscopy\",\n      \"pmids\": [\"34831286\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reconciliation between gain-of-function signaling and loss-of-localization not fully resolved\", \"Cargo selectivity (EGF vs transferrin) mechanism unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified LAMP-1 as a site-specific K48-linked substrate, mechanistically connecting RNF13 to suppression of lysosome maturation and sustained TLR inflammation.\",\n      \"evidence\": \"E3 ligase screen, site- and linkage-specific ubiquitination assays (K128, K48), proteasome inhibition, lysosomal acidification and TLR readouts, patient PBMCs\",\n      \"pmids\": [\"39031743\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How proteasomal degradation of a lysosomal membrane protein occurs mechanistically not fully detailed\", \"Link to RNF13 disease variants not established\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Resolved RNF13 trafficking logic by identifying a secondary glutamine/AP-1 motif providing an alternative Golgi-to-endosome route independent of the dileucine/AP-3 motif.\",\n      \"evidence\": \"Biochemical interaction assays, Co-IP, sorting-motif mutagenesis and microscopy in HeLa cells\",\n      \"pmids\": [\"39206621\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Conditions selecting AP-1 vs AP-3 routing in vivo unknown\", \"Functional consequence of alternate routing for substrate ubiquitination not defined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined a cytoprotective antioxidant arm in which RNF13 binds p62 and stabilizes the p62\\u2013NRF2\\u2013HO-1 axis, including by blocking TRIM21-mediated p62 degradation.\",\n      \"evidence\": \"Co-IP, GST-pulldown, mass spectrometry, RNA-seq, KO/AAV9-overexpression mice in cardiac hypertrophy and cerebral I/R models with p62-knockdown epistasis\",\n      \"pmids\": [\"37852547\", \"39511649\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether p62 stabilization requires RNF13 catalytic activity unclear\", \"Direct molecular interplay with TRIM21 not fully mapped\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established RNF13 as a pH/Ca2+-gated regulator of lysosomal positioning, coupling His332 deprotonation and ALG-2 binding to ubiquitin-dependent ARL8B/Arl8B control of lysosomal transport.\",\n      \"evidence\": \"His332 and interface-residue mutagenesis, Co-IP of RNF13\\u2013ALG-2 and RNF13\\u2013Arl8B, ARL8B ubiquitination assays, TRPML3 pharmacology, AlphaFold modeling, lysosomal positioning and EGFR trafficking microscopy\",\n      \"pmids\": [\"40714633\", \"42206902\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Integration of ALG-2 activation with Arl8B GDP-preference binding not fully unified\", \"In vivo relevance of pH-gated positioning unestablished\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed RNF13 functions within a heterodimer with RNF167 and modulates IDS maturation, indicating combinatorial E3 activity shapes lysosomal enzyme processing.\",\n      \"evidence\": \"Co-IP, AlphaFold3 prediction, glycosylation/western analysis, E3 catalytic mutants, proteasome inhibition, Asn246 mutagenesis\",\n      \"pmids\": [\"41387381\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which the heterodimer alters IDS processing not resolved\", \"Substrate specificity changes upon dimerization not mapped\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Clarified the disease variants' neuronal mechanism, showing L311S/L312P reroute via AP-1, mislocalize in dendrites, and act as dominant negatives for AP-3-dependent ligase function affecting synaptic markers.\",\n      \"evidence\": \"Primary rat hippocampal neuron imaging with endosomal/synaptic markers and dominant-negative constructs\",\n      \"pmids\": [\"40276023\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reconciliation of dominant-negative trafficking with gain-of-function ER stress signaling unresolved\", \"Substrate(s) underlying synaptic marker changes unidentified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How RNF13's distinct activities — IRE1\\u03b1 signaling, snapin/SNARE, LAMP-1/lysosome maturation, ALG-2/ARL8B positioning, p62/NRF2, and IDS/RNF167 — are coordinated within a single endolysosomal ligase, and how disease variants simultaneously gain ER-stress signaling while losing trafficking-dependent functions, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking signaling and trafficking arms\", \"Spatial/temporal control of substrate choice unknown\", \"Comprehensive substrate map incomplete\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 5, 6, 12, 16]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [6, 12, 16, 18]},\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [0, 5, 12]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [2, 5, 11]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [12, 16, 17]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0, 13]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [3, 4, 9, 10]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [3, 10, 15]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [11, 12, 16, 17]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [12, 18]}\n    ],\n    \"complexes\": [\"RNF13-RNF167 heterodimer\"],\n    \"partners\": [\"IRE1A\", \"SNAPIN\", \"LAMP1\", \"ALG2\", \"ARL8B\", \"SQSTM1\", \"RNF167\", \"IDS\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}