{"gene":"RNF41","run_date":"2026-06-10T06:43:37","timeline":{"discoveries":[{"year":2002,"finding":"Nrdp1/FLRF is a RING finger-type E3 ubiquitin ligase that physically associates with ErbB3, ubiquitinates ErbB3 and itself in the presence of E2 enzyme UbcH5, and promotes proteasomal degradation of ErbB3. The RING finger domain is required for enhancing ErbB3 degradation, while the C-terminal half alone associates with ErbB3 and acts as a dominant-negative.","method":"Cell-free ubiquitination assay, co-immunoprecipitation, domain deletion/mutagenesis, proteasome inhibitor experiments","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of E3 ligase activity plus mutagenesis plus cellular degradation assays in a single focused study","pmids":["12411582"],"is_preprint":false},{"year":2004,"finding":"Nrdp1 associates with and ubiquitinates BRUCE/apollon (a 530 kDa IAP) in vitro (with E2 UbcH5c) and in vivo, promoting its proteasomal degradation. Apoptotic stimuli induce BRUCE degradation in a Nrdp1-dependent manner; RNAi knockdown of Nrdp1 reduces apoptosis-induced BRUCE loss. Overexpression of Nrdp1 or knockdown of BRUCE promotes apoptosis.","method":"In vitro ubiquitination assay, co-immunoprecipitation, RNA interference, overexpression apoptosis assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution plus RNAi loss-of-function with defined phenotypic readout, multiple orthogonal methods","pmids":["14765125"],"is_preprint":false},{"year":2004,"finding":"Nrdp1 undergoes efficient proteasome-dependent self-ubiquitination (autoubiquitination), and RING finger mutations that disrupt ligase activity enhance Nrdp1 stability. The deubiquitinating enzyme USP8 physically interacts with Nrdp1 via its rhodanese and catalytic domains, and USP8 markedly stabilizes Nrdp1; a catalytically dead USP8 mutant destabilizes endogenous Nrdp1.","method":"Affinity chromatography, co-immunoprecipitation, stability/pulse-chase analysis, point mutagenesis of USP8 catalytic residue","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, mutagenesis, and functional stability assays; replicated in multiple subsequent studies","pmids":["15314180"],"is_preprint":false},{"year":2005,"finding":"Nrdp1 physically interacts with Parkin (validated by in vitro binding, co-IP, and co-localization), ubiquitinates Parkin, and accelerates Parkin degradation (reducing half-life from ~5 h to ~2.5 h), thereby reducing Parkin activity and reversing Parkin-mediated degradation of its substrate CDCrel-1.","method":"Yeast two-hybrid, in vitro binding assay, co-immunoprecipitation, immunofluorescence co-localization, pulse-chase experiment","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (Y2H, co-IP, in vitro binding, pulse-chase) in a single focused study","pmids":["15632191"],"is_preprint":false},{"year":2006,"finding":"Crystal structure of the C-terminal domain of Nrdp1/FLRF was solved at 1.95 Å. This domain is sufficient to mediate ErbB3 binding. Site-directed mutagenesis mapped the ErbB3-binding surface to a region conserved from invertebrates to vertebrates, localizing the substrate-recognition site.","method":"X-ray crystallography, site-directed mutagenesis, ErbB3-binding and degradation assays in transfected cells","journal":"Protein science : a publication of the Protein Society","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with functional mutagenesis validation in a single rigorous study","pmids":["17384230"],"is_preprint":false},{"year":2006,"finding":"Crystal structure of the USP8 rhodanese domain in complex with Nrdp1 reveals that Nrdp1 has a novel protein fold that interacts with a conserved peptide loop of the rhodanese domain; a consensus sequence of this loop is found in other Nrdp1 targets, suggesting a common interaction mode. The amino-terminal domain of USP8 forms a homodimer.","method":"X-ray crystallography, structural analysis of Nrdp1–USP8 rhodanese domain complex","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — high-resolution crystal structure of protein complex with mechanistic interpretation","pmids":["17035239"],"is_preprint":false},{"year":2007,"finding":"NRG1 (neuregulin-1) treatment stabilizes USP8 through Akt-mediated phosphorylation of USP8 Thr907, which in turn stabilizes Nrdp1. Nrdp1 and USP8 knockdown both suppress NRG1-induced ErbB3 ubiquitination and degradation, establishing a NRG1→Akt→USP8→Nrdp1→ErbB3 protein stability cascade.","method":"siRNA knockdown, pharmacological inhibitors, phosphorylation site mutagenesis (T907), ErbB3 ubiquitination/degradation assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — epistasis established with multiple orthogonal KD experiments and phospho-site mutagenesis in a single study","pmids":["17210635"],"is_preprint":false},{"year":2008,"finding":"Nrdp1 (FLRF) overexpression in hematopoietic progenitor cells decreases steady-state levels of IL-3 receptor, EPO receptor, and RARα, and attenuates cytokine- and retinoic acid-induced erythroid/myeloid differentiation. Immunoprecipitation shows FLRF physically interacts with IL-3R, EPOR, and RARα in a ligand-independent manner.","method":"Overexpression in hematopoietic progenitor cell lines, immunoprecipitation, hematopoietic colony-forming assays, Western blot","journal":"Experimental hematology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus functional differentiation assay, single lab with two orthogonal methods","pmids":["18495327"],"is_preprint":false},{"year":2008,"finding":"Nrdp1 ubiquitinates Parkin in vitro and in cells in a dosage-dependent, proteasome-dependent manner. Overexpression of Nrdp1 increases reactive oxygen species (ROS) production, which is abrogated by co-expression of Parkin; Nrdp1 shRNA knockdown reduces ROS levels.","method":"In vitro ubiquitination assay, overexpression/knockdown in SH-SY5Y cells, ROS measurement","journal":"Neuroscience letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro ubiquitination plus cellular functional readout, single lab","pmids":["18541373"],"is_preprint":false},{"year":2009,"finding":"Nrdp1 directly binds and polyubiquitinates MyD88 (leading to its proteasomal degradation) and TBK1 (leading to its activation, not degradation), thereby suppressing MyD88-dependent NF-κB/AP-1 activation while promoting TBK1/IRF3-dependent IFN-β production in TLR-triggered macrophages. Nrdp1 knockdown inhibits MyD88 degradation and TBK1/IRF3 activation.","method":"Co-immunoprecipitation, in vivo ubiquitination assay, siRNA knockdown, transgenic mouse model (LPS challenge, VSV infection)","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, ubiquitination assays, RNAi, and in vivo genetic model providing convergent evidence","pmids":["19483718"],"is_preprint":false},{"year":2010,"finding":"RNF41 interacts with JAK2-associated cytokine receptor complexes (leptin receptor, LIF receptor, IL-6 receptor) and controls their surface levels dually: ectopic RNF41 blocks intracellular cathepsin-L-dependent receptor cleavage while enhancing ADAM metalloprotease-dependent ectodomain shedding.","method":"Co-immunoprecipitation, pharmacological inhibitors of cathepsin L and ADAMs, receptor surface/shedding assays","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus inhibitor-based pathway dissection, single lab, two orthogonal approaches","pmids":["21378310"],"is_preprint":false},{"year":2010,"finding":"Androgen receptor (AR) transcriptionally upregulates Nrdp1 in androgen-dependent prostate cancer cells; AR activation promotes ErbB3 degradation in a Nrdp1-dependent manner. In castration-resistant prostate cancer, this AR-Nrdp1 regulatory axis is lost, leading to constitutively suppressed Nrdp1 and elevated ErbB3.","method":"Androgen withdrawal/AR activation experiments, Nrdp1 promoter analysis, Western blot for ErbB3 and Nrdp1, mouse xenograft model","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — AR manipulation experiments with Nrdp1 and ErbB3 readout, supported by in vivo xenograft, single lab","pmids":["20587519"],"is_preprint":false},{"year":2012,"finding":"Nrdp1 interacts with and mediates K63-linked polyubiquitination of the transcription factor C/EBPβ, which enhances C/EBPβ transcriptional activity and promotes M2 macrophage polarization (upregulation of Arg1 and other M2 markers) in response to IL-4. This represents a non-proteolytic ubiquitin-dependent pathway.","method":"Immunoprecipitation, K63-linked ubiquitination assay, reporter gene assay (Arg1 promoter), Nrdp1 knockdown/transgenic macrophages","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, K63 ubiquitination assay, reporter assay, and in vivo transgenic model; multiple orthogonal methods","pmids":["22707723"],"is_preprint":false},{"year":2013,"finding":"RNF41 ubiquitinates USP8 and reduces USP8 protein levels, redistributing USP8 from ESCRT-0-associated compartments to RNF41 bodies. Loss of USP8 destabilizes the ESCRT-0 complex and blocks lysosomal degradation of cytokine receptors while promoting their recycling. USP8 knockdown phenocopies RNF41 overexpression on leptin and LIF receptor trafficking.","method":"Immunoprecipitation, ubiquitination assays, USP8 siRNA knockdown, ESCRT-0 stability assays, receptor trafficking experiments","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, ubiquitination assays, RNAi epistasis, replicated across multiple receptor models in single lab with multiple orthogonal methods","pmids":["23750007"],"is_preprint":false},{"year":2013,"finding":"Par-1b (MARK2) kinase binds to and phosphorylates RNF41 on serine 254. This phosphorylation is required for epithelial cells to localize laminin-111 receptors to their basolateral surfaces, to properly anchor to laminin-111, and to establish apical-basal polarity.","method":"Kinase assay, phosphorylation site mutagenesis (S254), co-immunoprecipitation, laminin receptor localization assays, polarity assays","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, in vitro kinase assay, site mutagenesis and functional polarity readout, single lab","pmids":["24259665"],"is_preprint":false},{"year":2014,"finding":"Nrdp1 self-associates into a stable oligomeric complex in cells via its coiled-coil domain. Deletion of the coiled-coil domain abolishes oligomerization but does not affect ErbB3 ubiquitination/degradation. The coiled-coil domain is required for efficient Nrdp1 autoubiquitination via a trans mechanism, demonstrating that autoubiquitination and substrate ubiquitination are functionally separable.","method":"Chemical cross-linking, size exclusion chromatography, native PAGE, co-immunoprecipitation, domain deletion mutagenesis, ubiquitination assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal structural and biochemical methods plus mutagenesis in a single rigorous study","pmids":["24519943"],"is_preprint":false},{"year":2015,"finding":"Nrdp1 mediates K33-linked polyubiquitination of Zap70, which promotes dephosphorylation of Zap70 by phosphatases Sts1 and Sts2, thereby terminating early TCR signaling in CD8+ T cells. Nrdp1 physically interacts with Zap70 and with Sts1/Sts2 and connects K33-linked ubiquitin modification to Sts-mediated dephosphorylation.","method":"Co-immunoprecipitation, K33-specific ubiquitination assay, Nrdp1-deficient mouse T cells, Zap70 phosphorylation assays, Sts1/Sts2 dephosphorylation assays","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, linkage-specific ubiquitination, genetic knockout model with defined signaling readout, multiple orthogonal methods","pmids":["26390156"],"is_preprint":false},{"year":2015,"finding":"Nuclear filamin A (FLNA) is required for AR binding to the Nrdp1 androgen response element (ARE) and AR-mediated Nrdp1 transcription. Restoration of nuclear FLNA in castration-resistant prostate cancer cells re-establishes AR binding to the Nrdp1 promoter, increases Nrdp1 transcription and protein expression, and restores androgen responsiveness.","method":"ChIP assay, promoter ARE binding, nuclear FLNA restoration, qRT-PCR, Western blot","journal":"Endocrine-related cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and functional rescue experiment, single lab with two orthogonal methods","pmids":["25759396"],"is_preprint":false},{"year":2016,"finding":"Lenalidomide promotes EpoR/RNF41 association and inhibits RNF41 auto-ubiquitination, leading to reduced EpoR ubiquitination and stabilization of EpoR at the cell surface. This effect is cereblon-independent. RNF41 overexpression reduces steady-state EpoR levels, and lenalidomide-induced EpoR upregulation is abrogated when cellular RNF41 is overexpressed.","method":"Co-immunoprecipitation, auto-ubiquitination assay, EpoR/RNF41 transfection, shRNA knockdown of CRBN, flow cytometry for EpoR surface levels","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, ubiquitination assay, and genetic rescue with RNF41 constructs, single lab","pmids":["27197154"],"is_preprint":false},{"year":2017,"finding":"Nrdp1 physically interacts with VANGL1 and VANGL2 (PCP pathway components) and mediates K63-linked polyubiquitination of the DEP domain of Dishevelled (Dvl). This ubiquitination impairs Dvl binding to phosphatidic acid, blocking Dvl recruitment to the plasma membrane upon Wnt/Fzd stimulation and thereby suppressing PCP signaling and GBM cell migration.","method":"Co-immunoprecipitation, K63 ubiquitination assay, Dvl-phosphatidic acid binding assay, siRNA knockdown, migration/invasion assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, K63 ubiquitination, and lipid-binding assay with functional migration readout, single lab","pmids":["28481871"],"is_preprint":false},{"year":2017,"finding":"RNF41 interacts with VPS52 (a subunit of the GARP and EARP complexes) via coiled-coil domain interactions. RNF41 ubiquitinates VPS52 and relocates it away from VPS53 (another GARP/EARP subunit) towards RNF41 bodies, revealing a role for RNF41 in regulating intracellular vesicle trafficking machinery.","method":"Array MAPPIT protein-protein interaction screen, co-immunoprecipitation, ubiquitination assay, co-localization microscopy","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — MAPPIT screen plus co-IP and ubiquitination assay, single lab with multiple methods but no in vitro reconstitution","pmids":["28542518"],"is_preprint":false},{"year":2017,"finding":"RNF41 ubiquitinates SGT1 in a phosphorylation-dependent manner, promoting SGT1 degradation and causing defective kinetochore assembly. The phosphatase PHLPP1 dephosphorylates SGT1 at Ser-17, Ser-249, Ser-289, and Thr-233, preventing SGT1 association with RNF41 and thereby protecting it from degradation. Depletion of RNF41 or expression of non-phosphorylatable SGT1 rescues kinetochore defects caused by PHLPP1 loss.","method":"Co-immunoprecipitation, ubiquitination assay, phosphorylation site mutagenesis, PHLPP1/RNF41 knockdown, kinetochore assembly assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis by genetic rescue, co-IP, ubiquitination assay, and phosphorylation mutagenesis in single study","pmids":["28696259"],"is_preprint":false},{"year":2017,"finding":"Clec16a, Nrdp1, and USP8 form a tripartite ubiquitin-dependent complex that regulates β-cell mitophagy. Clec16a is an E3 ligase that promotes nondegradative ubiquitin conjugates to stabilize the complex. RNF41/Nrdp1 is a component of this mitophagy regulatory complex in pancreatic β-cells and is required for mitochondrial quality control, oxygen consumption, and insulin secretion.","method":"Co-immunoprecipitation, ubiquitination assay, genetic knockdown/overexpression in β-cells, mitophagy flux assays, metabolic readouts","journal":"Diabetes","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, ubiquitination assay, and functional metabolic readout, single lab with multiple methods","pmids":["29180353"],"is_preprint":false},{"year":2018,"finding":"RNF41 was identified as a driver of anti-HER3 antibody (IgG 95) anti-proliferative activity via shRNA library screen. RNF41 is responsible for HER3 ubiquitination and downregulation upon antibody treatment, and RNF41 downregulation itself is a mechanism for acquired resistance to anti-HER3 antibody treatment.","method":"shRNA library screen (ubiquitin proteasome system), HER3 ubiquitination assay, receptor internalization/degradation assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional genomics screen with follow-up ubiquitination and receptor downregulation validation, single lab","pmids":["30523157"],"is_preprint":false},{"year":2018,"finding":"AP2S1 (a clathrin adaptor subunit) was identified as an RNF41 interaction partner by multi-orthogonal interactome screen. RNF41 stabilizes and relocates AP2S1, and AP2S1 plays a role in leptin and LIF receptor signaling downstream of RNF41.","method":"Affinity purification-mass spectrometry, BioID, Virotrap, microarray MAPPIT, Y2H, functional validation with AP2S1 knockdown/overexpression","journal":"Journal of proteome research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal interaction methods plus functional validation, single lab","pmids":["29560723"],"is_preprint":false},{"year":2019,"finding":"RNF41 binds CACYBP via its C-terminal substrate-binding domain, ubiquitinates CACYBP, and promotes its degradation via both proteasome- and lysosome-dependent pathways. RNF41-mediated CACYBP degradation attenuates CACYBP-induced Ser10 phosphorylation and cytoplasmic retention of p27Kip1, thereby restricting cell cycle progression.","method":"Co-immunoprecipitation, ubiquitination assay, proteasome/lysosome inhibitor experiments, immunofluorescence for p27 localization, cell cycle assays","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, ubiquitination assay, and mechanistic cell biology readout, single lab","pmids":["31754404"],"is_preprint":false},{"year":2020,"finding":"RNF41 directly binds and ubiquitinates the extracellular domains of the dendritic cell receptor Clec9A. At steady-state, RNF41 ubiquitination of Clec9A facilitates interactions with ER-associated degradation proteins to control Clec9A levels; following dead cell uptake, Clec9A interactions shift to favor antigen cross-presentation. RNF41 is a negative regulator of Clec9A-mediated cross-presentation.","method":"Co-immunoprecipitation, ubiquitination assay targeting extracellular domain, RNF41 knockout dendritic cells, antigen cross-presentation assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Moderate — co-IP, ubiquitination assay, genetic KO with functional antigen presentation readout; multiple orthogonal methods in single rigorous study","pmids":["33264090"],"is_preprint":false},{"year":2021,"finding":"A20 interacts with Nrdp1/RNF41 in LPS-stimulated cells. The ZnF4 domain of A20 is required for Nrdp1 polyubiquitination. A20 knockout decreases K48-linked ubiquitination of MyD88 (reducing its degradation) but increases K63-linked ubiquitination of TBK1. Combined A20 and Nrdp1 inhibition shows that A20/Nrdp1 interaction is important for A20 anti-inflammatory effects by modulating the balance between MyD88 degradation and TBK1 activation.","method":"Mass spectrometry screen, co-immunoprecipitation, A20 knockout, Nrdp1 knockdown, linkage-specific ubiquitination assays, domain mutagenesis (ZnF4), cytokine secretion assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus K48/K63 linkage-specific ubiquitination assays plus domain mutagenesis, single lab","pmids":["34023381"],"is_preprint":false},{"year":2021,"finding":"NRDP1 is present in both cytoplasm and nucleus of prostate cancer cells. Its nuclear translocation is associated with androgen receptor (AR) activity; binding of NRDP1 to AR requires the AR hinge region. Nuclear NRDP1 retains ubiquitin ligase activity.","method":"Subcellular fractionation, immunohistochemistry, immunofluorescence with confocal microscopy, co-immunoprecipitation with AR constructs, HA-ubiquitin co-transfection assay","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — subcellular fractionation plus co-IP with mutagenesis of AR hinge region plus functional ubiquitin assay, single lab","pmids":["34503235"],"is_preprint":false},{"year":2022,"finding":"RNF41 promotes ubiquitination and degradation of ASB6 through direct interaction mediated by binding to FXR2 (which stabilizes RNF41 mRNA). Silencing RNF41 counteracts circFNDC3B-mediated suppression of colorectal cancer stemness and metastasis, placing RNF41-mediated ASB6 degradation downstream of the circFNDC3B-FXR2 axis.","method":"Co-immunoprecipitation, RNA immunoprecipitation, RNA pull-down, ubiquitination assay, siRNA knockdown, in vivo xenograft","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, ubiquitination assay, and genetic epistasis with functional cancer biology readout, single lab","pmids":["36446779"],"is_preprint":false},{"year":2023,"finding":"The CLEC16A internal intrinsically disordered protein region (IDPR) is the site where RNF41 binds and acts to destabilize CLEC16A, promoting its degradation and thereby controlling the reciprocal regulatory balance within the CLEC16A-RNF41-USP8 mitophagy complex. Loss of this IDPR also destabilizes the tripartite complex.","method":"NMR and CD spectroscopy (IDPR confirmation), co-immunoprecipitation, ubiquitination assays, deletion mutagenesis of IDPR","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — NMR/CD structural validation of IDPR plus co-IP and functional degradation assays, single lab","pmids":["36822331"],"is_preprint":false},{"year":2023,"finding":"Global deletion of Nrdp1 in mice leads to male infertility by disrupting autophagy-associated acrosome biogenesis and mitochondrial arrangement during spermiogenesis. Nrdp1 deletion increases Parkin levels but decreases SIP/CacyBP, Drp1, and Tim23 in sperm, inhibiting autophagy. This establishes a functional role for Nrdp1 in promoting autophagy during spermiogenesis via its known substrates.","method":"Nrdp1 knockout mouse, quantitative proteomics, autophagy flux assays, Western blot, sperm morphology analysis","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout with quantitative proteomics and functional autophagy readout, single lab","pmids":["37759433"],"is_preprint":false},{"year":2024,"finding":"RNF41 induces K27- and K63-linked non-canonical polyubiquitination of MYO1C to enhance its stability, which promotes actin remodeling and prostate cancer bone metastasis. RNF41 silencing reduces MYO1C levels and suppresses metastasis in an intra-arterial bone metastasis xenograft model.","method":"Co-immunoprecipitation, K27/K63-specific ubiquitination assay, RNF41 silencing, in vitro migration/invasion assays, in vivo bone metastasis xenograft model","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — linkage-specific ubiquitination assay plus in vivo functional validation, single lab","pmids":["39112516"],"is_preprint":false},{"year":2024,"finding":"VEGF activates CHIP, which triggers Nrdp1 degradation in vascular endothelial cells. Nrdp1 deficiency increases secretion of Fam20C (a secretory kinase), which induces degradation of extracellular matrix and disrupts vascular basement membrane integrity, thereby promoting tumor metastasis. Nrdp1 normally targets Fam20C for degradation to maintain vascular basement membrane integrity.","method":"Conditional Nrdp1 knockout mice (endothelial-specific), co-immunoprecipitation, ubiquitination assay, Fam20C secretion assay, in vivo lung metastasis model, VEGF treatment experiments","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO mouse plus mechanistic ubiquitination and secretion assays, single lab","pmids":["38654108"],"is_preprint":false},{"year":2025,"finding":"RNF41 directly interacts with NUDC and ubiquitinates it to promote its proteasomal degradation. RNF41 loss leads to increased NUDC stability, which enhances β-tubulin polymerization and promotes bladder cancer lung metastasis.","method":"Co-immunoprecipitation, ubiquitination assay, RNF41 knockdown and overexpression, in vitro migration/invasion assays, tail vein lung metastasis model","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, ubiquitination assay, and in vivo functional model, single lab","pmids":["40494872"],"is_preprint":false}],"current_model":"RNF41/Nrdp1 is a RING finger/RBCC-family E3 ubiquitin ligase that promotes both degradative (K48-linked) and non-degradative (K33, K63, K27) polyubiquitination of a diverse substrate repertoire—including ErbB3, ErbB4, BRUCE/BIRC6, Parkin, MyD88, TBK1, USP8, Zap70, C/EBPβ, Dvl, SGT1, Clec9A, CACYBP, MYO1C, VPS52, NUDC, Fam20C, and ASB6—to regulate receptor tyrosine kinase turnover, innate immune signaling, TCR termination, apoptosis, autophagy/mitophagy, cell polarity, and cancer cell migration; its activity is itself controlled by auto-ubiquitination (promoting self-degradation), coiled-coil domain-dependent oligomerization (required for efficient auto-ubiquitination in trans), stabilization by the deubiquitinase USP8, phosphorylation by Par-1b/MARK2 (Ser254), and transcriptional regulation by the androgen receptor in a nuclear filamin A-dependent manner."},"narrative":{"mechanistic_narrative":"RNF41 (Nrdp1/FLRF) is a RING finger E3 ubiquitin ligase that controls the abundance, surface display, and signaling output of a broad set of receptors and intracellular regulators through both degradative and non-degradative polyubiquitination [PMID:12411582, PMID:19483718]. Its founding substrate is the receptor tyrosine kinase ErbB3/HER3, which it binds through a structurally defined C-terminal substrate-recognition domain and targets for proteasomal degradation via its RING domain [PMID:12411582, PMID:17384230, PMID:30523157]. RNF41 activity is self-limiting: it undergoes RING-dependent autoubiquitination that drives its own turnover, and its coiled-coil domain mediates oligomerization required for efficient autoubiquitination in trans—a step functionally separable from substrate ubiquitination [PMID:15314180, PMID:24519943]. RNF41 stability is set by a reciprocal relationship with the deubiquitinase USP8, which binds RNF41 through its rhodanese domain and stabilizes it, while RNF41 in turn ubiquitinates USP8 and remodels endosomal/ESCRT-0-associated trafficking of cytokine receptors [PMID:15314180, PMID:17035239, PMID:23750007]. Through linkage-selective ubiquitination, RNF41 acts as a signaling switch rather than a simple degrader: it degrades MyD88 while activating TBK1 to bias TLR responses toward type I interferon, mediates K63 ubiquitination of C/EBPβ to drive M2 macrophage polarization, and applies K33-linked ubiquitin to ZAP70 to license Sts-phosphatase-mediated termination of TCR signaling [PMID:19483718, PMID:22707723, PMID:26390156]. This ligase logic extends across receptor turnover, innate and adaptive immunity, apoptosis via BRUCE/Apollon degradation, autophagy/mitophagy through a CLEC16A–RNF41–USP8 complex and Parkin regulation, cell polarity, and cancer cell migration and metastasis [PMID:14765125, PMID:15632191, PMID:29180353, PMID:36822331, PMID:39112516]. In prostate cancer, the androgen receptor transcriptionally upregulates RNF41 in a nuclear filamin A-dependent manner to drive ErbB3 degradation, an axis lost in castration-resistant disease [PMID:20587519, PMID:25759396].","teleology":[{"year":2002,"claim":"Established RNF41 as a bona fide RING E3 ligase and defined its founding substrate, answering what enzymatic activity and target the protein has.","evidence":"Cell-free ubiquitination with E2 UbcH5, co-IP, and proteasome inhibitor degradation assays on ErbB3","pmids":["12411582"],"confidence":"High","gaps":["Did not define linkage type of ErbB3 ubiquitin chains","Substrate-recognition surface not mapped structurally at this stage"]},{"year":2004,"claim":"Showed RNF41 controls its own abundance through autoubiquitination and is reciprocally stabilized by USP8, establishing the core regulatory loop governing ligase levels.","evidence":"Autoubiquitination/stability assays, reciprocal co-IP, and catalytic-dead USP8 mutagenesis; separately BRUCE/Apollon degradation by RNAi and apoptosis assays","pmids":["15314180","14765125"],"confidence":"High","gaps":["Structural basis of RNF41–USP8 binding not yet resolved","How USP8 and autoubiquitination are dynamically balanced not defined"]},{"year":2005,"claim":"Extended the substrate repertoire to Parkin, showing RNF41 can regulate another E3 ligase and indirectly its downstream substrates.","evidence":"Y2H, in vitro binding, co-IP, co-localization, and pulse-chase half-life measurement","pmids":["15632191"],"confidence":"High","gaps":["Physiological context of Parkin regulation not established in this study","Chain linkage on Parkin not characterized"]},{"year":2006,"claim":"Provided structural definition of the substrate-binding and USP8-interaction surfaces, explaining how RNF41 selects targets and partners.","evidence":"X-ray crystallography of the C-terminal domain and of the USP8 rhodanese–RNF41 complex, with mutagenesis","pmids":["17384230","17035239"],"confidence":"High","gaps":["Full-length structure including RING and coiled-coil not solved","Predicted consensus binding motif across targets not experimentally validated for all substrates"]},{"year":2007,"claim":"Placed RNF41 in a regulated signaling cascade, showing ligand-driven kinase signaling tunes RNF41 stability and receptor turnover.","evidence":"siRNA, inhibitors, and USP8 T907 phospho-site mutagenesis defining a NRG1→Akt→USP8→Nrdp1→ErbB3 axis","pmids":["17210635"],"confidence":"High","gaps":["Whether other ligands feed this axis not tested","Direct kinase–substrate stoichiometry not quantified"]},{"year":2008,"claim":"Broadened the receptor target set to hematopoietic cytokine receptors and linked RNF41 to differentiation and ROS, suggesting a general role in receptor homeostasis.","evidence":"Overexpression/knockdown in progenitor and SH-SY5Y cells, co-IP, colony assays, ROS measurement","pmids":["18495327","18541373"],"confidence":"Medium","gaps":["Direct ubiquitination of IL-3R/EPOR/RARα not shown","ROS link to Parkin is correlative in cell overexpression"]},{"year":2009,"claim":"Revealed RNF41 as a signaling switch in innate immunity that degrades one effector while activating another, demonstrating non-degradative ubiquitination function in vivo.","evidence":"Reciprocal co-IP, in vivo ubiquitination, siRNA, and transgenic mouse LPS/VSV challenge for MyD88 and TBK1","pmids":["19483718"],"confidence":"High","gaps":["Chain linkages distinguishing degradative vs activating outcomes not fully resolved here","Mechanism by which TBK1 ubiquitination promotes activation not detailed"]},{"year":2010,"claim":"Connected RNF41 to receptor trafficking decisions and to transcriptional control by the androgen receptor, linking ligase abundance to cancer-relevant receptor levels.","evidence":"Co-IP and protease inhibitor dissection of cytokine receptor cleavage/shedding; AR activation, promoter analysis, and xenografts for the AR–Nrdp1–ErbB3 axis","pmids":["21378310","20587519"],"confidence":"Medium","gaps":["Direct mechanism coupling RNF41 to cathepsin-L vs ADAM activities unclear","How AR-driven RNF41 loss arises in castration resistance not mechanistically defined here"]},{"year":2012,"claim":"Demonstrated K63-linked, non-proteolytic ubiquitination as a means to enhance transcription factor activity, expanding RNF41's mechanistic repertoire.","evidence":"Co-IP, K63 ubiquitination assay, Arg1 reporter, and transgenic macrophage M2 polarization readouts on C/EBPβ","pmids":["22707723"],"confidence":"High","gaps":["Site of C/EBPβ ubiquitination not mapped","How K63 chains enhance transcriptional activity mechanistically unresolved"]},{"year":2013,"claim":"Defined RNF41's role in ESCRT/endosomal trafficking and the regulated phosphorylation input controlling polarity, integrating ligase activity into membrane and cytoskeletal organization.","evidence":"Ubiquitination and RNAi epistasis on USP8/ESCRT-0 receptor trafficking; MARK2/Par-1b kinase assay and S254 mutagenesis for polarity","pmids":["23750007","24259665"],"confidence":"High","gaps":["How S254 phosphorylation alters RNF41 activity biochemically not defined","Nature of 'RNF41 bodies' compartment not characterized"]},{"year":2014,"claim":"Showed coiled-coil-dependent oligomerization drives trans-autoubiquitination separable from substrate ubiquitination, clarifying how self-regulation and target turnover are mechanistically distinct.","evidence":"Cross-linking, SEC, native PAGE, domain deletion, and parallel ErbB3 vs auto-ubiquitination assays","pmids":["24519943"],"confidence":"High","gaps":["Oligomer stoichiometry and architecture not structurally determined","Whether oligomerization influences substrate selectivity untested"]},{"year":2015,"claim":"Established a distinct K33 linkage coupling ubiquitination to phosphatase recruitment for TCR signal termination, and resolved the nuclear AR–filamin A requirement for RNF41 transcription.","evidence":"K33-specific ubiquitination, Nrdp1-knockout T cells, Sts1/2 dephosphorylation assays on ZAP70; ChIP and nuclear FLNA restoration for AR-driven transcription","pmids":["26390156","25759396"],"confidence":"High","gaps":["How K33 chains physically recruit Sts phosphatases not structurally shown","Generality of K33 mechanism to other substrates unknown"]},{"year":2017,"claim":"Greatly expanded the substrate landscape to vesicle trafficking, kinetochore assembly, cell cycle, mitophagy, and PCP/migration, showing phosphorylation-gated substrate recognition.","evidence":"Co-IP, linkage-specific and phospho-dependent ubiquitination assays, MAPPIT screens, and functional readouts on VPS52, SGT1/PHLPP1, CLEC16A/USP8, CACYBP, and Dvl/VANGL","pmids":["28542518","28696259","29180353","31754404","28481871"],"confidence":"Medium","gaps":["In vitro reconstitution lacking for several substrates","How phosphorylation switches substrate affinity not generalized across targets"]},{"year":2018,"claim":"Linked RNF41 to therapeutic receptor modulation and refined its interactome, positioning it as both a driver of anti-HER3 antibody efficacy and a node in clathrin-adaptor-dependent receptor signaling.","evidence":"shRNA screen with HER3 ubiquitination follow-up; multi-orthogonal interactome (AP-MS, BioID, Virotrap, MAPPIT, Y2H) and AP2S1 functional validation","pmids":["30523157","29560723"],"confidence":"Medium","gaps":["Mechanism of acquired resistance via RNF41 loss not fully dissected","AP2S1 functional pathway downstream of RNF41 incompletely defined"]},{"year":2020,"claim":"Showed RNF41 ubiquitinates a receptor extracellular domain to gate ERAD versus cross-presentation, demonstrating context-dependent fate control of an immune receptor.","evidence":"Co-IP, extracellular-domain ubiquitination assay, and RNF41-knockout dendritic cell cross-presentation assays on Clec9A","pmids":["33264090"],"confidence":"High","gaps":["How dead-cell uptake switches Clec9A interaction partners mechanistically unclear","Topology of extracellular-domain ubiquitination not structurally resolved"]},{"year":2021,"claim":"Embedded RNF41 in the A20 anti-inflammatory program and confirmed nuclear, catalytically active RNF41 bound to AR, refining its roles in immune signaling balance and prostate cancer.","evidence":"MS screens, co-IP, A20 ZnF4 mutagenesis with K48/K63 linkage assays; subcellular fractionation and AR hinge-region co-IP with ubiquitin assay","pmids":["34023381","34503235"],"confidence":"Medium","gaps":["Nuclear RNF41 substrates not identified","Directionality of A20–RNF41 ubiquitin transfer not fully resolved"]},{"year":2023,"claim":"Mapped the intrinsically disordered region in CLEC16A as the RNF41 binding/destabilization site and established an in vivo requirement for RNF41 in autophagy-dependent spermiogenesis.","evidence":"NMR/CD with co-IP and degradation assays on the CLEC16A IDPR; Nrdp1-knockout mouse proteomics and sperm morphology analysis","pmids":["36822331","37759433"],"confidence":"Medium","gaps":["How the tripartite complex balance is set in vivo not quantified","Causal contribution of individual substrates to infertility phenotype not isolated"]},{"year":2024,"claim":"Defined opposing pro- and anti-metastatic roles via non-canonical stabilizing ubiquitination of MYO1C and degradation of secreted Fam20C, showing RNF41 outputs are context- and substrate-specific.","evidence":"K27/K63-specific ubiquitination assays, endothelial-specific and tumor knockdown models, and in vivo bone/lung metastasis xenografts","pmids":["39112516","38654108"],"confidence":"Medium","gaps":["How linkage choice (stabilizing vs degradative) is determined per substrate unresolved","Upstream signals selecting MYO1C vs Fam20C engagement unknown"]},{"year":2025,"claim":"Added NUDC as a degradative substrate linking RNF41 to microtubule dynamics and metastasis suppression, reinforcing its broad role in cytoskeletal and cancer cell behavior.","evidence":"Co-IP, ubiquitination assay, knockdown/overexpression, and tail-vein lung metastasis model","pmids":["40494872"],"confidence":"Medium","gaps":["Chain linkage on NUDC not specified","In vitro reconstitution not performed"]},{"year":null,"claim":"It remains unresolved what molecular code dictates RNF41's choice between degradative (K48) and non-degradative (K27/K33/K63) chain linkages on different substrates and how upstream signals select among its many targets.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying rule linking substrate phosphorylation/context to chain-linkage output","No full-length structural model integrating RING, coiled-coil oligomerization, and substrate domain","Identity of nuclear RNF41 substrates undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[0,1,9,12,16,26,32]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,9,13,25,34]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[28,31]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[28]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[13]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[22,31]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,2,13]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[9,12,16,26,27]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[22,30,31]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[9,16,19]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[11,23,32,34]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[1]}],"complexes":["CLEC16A-RNF41-USP8 mitophagy complex"],"partners":["ERBB3","USP8","PARK2","MYD88","TBK1","ZAP70","CLEC16A","VPS52"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9H4P4","full_name":"E3 ubiquitin-protein ligase NRDP1","aliases":["RING finger protein 41","RING-type E3 ubiquitin transferase NRDP1"],"length_aa":317,"mass_kda":35.9,"function":"Acts as E3 ubiquitin-protein ligase and regulates the degradation of target proteins. Polyubiquitinates MYD88. Negatively regulates MYD88-dependent production of pro-inflammatory cytokines. Can promote TRIF-dependent production of type I interferon and inhibits infection with vesicular stomatitis virus (By similarity). Promotes also activation of TBK1 and IRF3. Involved in the ubiquitination of erythropoietin (EPO) and interleukin-3 (IL-3) receptors. Thus, through maintaining basal levels of cytokine receptors, RNF41 is involved in the control of hematopoietic progenitor cell differentiation into myeloerythroid lineages (By similarity). Contributes to the maintenance of steady-state ERBB3 levels by mediating its growth factor-independent degradation. Involved in the degradation of the inhibitor of apoptosis BIRC6 and thus is an important regulator of cell death by promoting apoptosis. Also acts as a PRKN modifier that accelerates its degradation, resulting in a reduction of PRKN activity, influencing the balance of intracellular redox state. The RNF41-PRKN pathway regulates autophagosome-lysosome fusion during late mitophagy. Mitophagy is a selective form of autophagy necessary for mitochondrial quality control (PubMed:24949970)","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/Q9H4P4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RNF41","classification":"Not Classified","n_dependent_lines":102,"n_total_lines":1208,"dependency_fraction":0.08443708609271523},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RNF41","total_profiled":1310},"omim":[{"mim_id":"620051","title":"RING FINGER PROTEIN 41, E3 UBIQUITIN PROTEIN LIGASE; RNF41","url":"https://www.omim.org/entry/620051"},{"mim_id":"605638","title":"BACULOVIRAL IAP REPEAT-CONTAINING PROTEIN 6; BIRC6","url":"https://www.omim.org/entry/605638"},{"mim_id":"603158","title":"UBIQUITIN-SPECIFIC PROTEASE 8; USP8","url":"https://www.omim.org/entry/603158"},{"mim_id":"600543","title":"ERB-B2 RECEPTOR TYROSINE KINASE 4; ERBB4","url":"https://www.omim.org/entry/600543"},{"mim_id":"190151","title":"ERB-B2 RECEPTOR TYROSINE KINASE 3; ERBB3","url":"https://www.omim.org/entry/190151"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Nuclear bodies","reliability":"Approved"},{"location":"Midbody ring","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/RNF41"},"hgnc":{"alias_symbol":["SBBI03","NRDP1"],"prev_symbol":[]},"alphafold":{"accession":"Q9H4P4","domains":[{"cath_id":"3.30.40.10","chopping":"4-78","consensus_level":"high","plddt":94.3259,"start":4,"end":78},{"cath_id":"-","chopping":"207-315","consensus_level":"high","plddt":93.4495,"start":207,"end":315}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H4P4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H4P4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H4P4-F1-predicted_aligned_error_v6.png","plddt_mean":92.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RNF41","jax_strain_url":"https://www.jax.org/strain/search?query=RNF41"},"sequence":{"accession":"Q9H4P4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9H4P4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9H4P4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H4P4"}},"corpus_meta":[{"pmid":"19483718","id":"PMC_19483718","title":"The 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The RING finger domain is required for enhancing ErbB3 degradation, while the C-terminal half alone associates with ErbB3 and acts as a dominant-negative.\",\n      \"method\": \"Cell-free ubiquitination assay, co-immunoprecipitation, domain deletion/mutagenesis, proteasome inhibitor experiments\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of E3 ligase activity plus mutagenesis plus cellular degradation assays in a single focused study\",\n      \"pmids\": [\"12411582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Nrdp1 associates with and ubiquitinates BRUCE/apollon (a 530 kDa IAP) in vitro (with E2 UbcH5c) and in vivo, promoting its proteasomal degradation. Apoptotic stimuli induce BRUCE degradation in a Nrdp1-dependent manner; RNAi knockdown of Nrdp1 reduces apoptosis-induced BRUCE loss. Overexpression of Nrdp1 or knockdown of BRUCE promotes apoptosis.\",\n      \"method\": \"In vitro ubiquitination assay, co-immunoprecipitation, RNA interference, overexpression apoptosis assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution plus RNAi loss-of-function with defined phenotypic readout, multiple orthogonal methods\",\n      \"pmids\": [\"14765125\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Nrdp1 undergoes efficient proteasome-dependent self-ubiquitination (autoubiquitination), and RING finger mutations that disrupt ligase activity enhance Nrdp1 stability. The deubiquitinating enzyme USP8 physically interacts with Nrdp1 via its rhodanese and catalytic domains, and USP8 markedly stabilizes Nrdp1; a catalytically dead USP8 mutant destabilizes endogenous Nrdp1.\",\n      \"method\": \"Affinity chromatography, co-immunoprecipitation, stability/pulse-chase analysis, point mutagenesis of USP8 catalytic residue\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, mutagenesis, and functional stability assays; replicated in multiple subsequent studies\",\n      \"pmids\": [\"15314180\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Nrdp1 physically interacts with Parkin (validated by in vitro binding, co-IP, and co-localization), ubiquitinates Parkin, and accelerates Parkin degradation (reducing half-life from ~5 h to ~2.5 h), thereby reducing Parkin activity and reversing Parkin-mediated degradation of its substrate CDCrel-1.\",\n      \"method\": \"Yeast two-hybrid, in vitro binding assay, co-immunoprecipitation, immunofluorescence co-localization, pulse-chase experiment\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (Y2H, co-IP, in vitro binding, pulse-chase) in a single focused study\",\n      \"pmids\": [\"15632191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Crystal structure of the C-terminal domain of Nrdp1/FLRF was solved at 1.95 Å. This domain is sufficient to mediate ErbB3 binding. Site-directed mutagenesis mapped the ErbB3-binding surface to a region conserved from invertebrates to vertebrates, localizing the substrate-recognition site.\",\n      \"method\": \"X-ray crystallography, site-directed mutagenesis, ErbB3-binding and degradation assays in transfected cells\",\n      \"journal\": \"Protein science : a publication of the Protein Society\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with functional mutagenesis validation in a single rigorous study\",\n      \"pmids\": [\"17384230\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Crystal structure of the USP8 rhodanese domain in complex with Nrdp1 reveals that Nrdp1 has a novel protein fold that interacts with a conserved peptide loop of the rhodanese domain; a consensus sequence of this loop is found in other Nrdp1 targets, suggesting a common interaction mode. The amino-terminal domain of USP8 forms a homodimer.\",\n      \"method\": \"X-ray crystallography, structural analysis of Nrdp1–USP8 rhodanese domain complex\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — high-resolution crystal structure of protein complex with mechanistic interpretation\",\n      \"pmids\": [\"17035239\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"NRG1 (neuregulin-1) treatment stabilizes USP8 through Akt-mediated phosphorylation of USP8 Thr907, which in turn stabilizes Nrdp1. Nrdp1 and USP8 knockdown both suppress NRG1-induced ErbB3 ubiquitination and degradation, establishing a NRG1→Akt→USP8→Nrdp1→ErbB3 protein stability cascade.\",\n      \"method\": \"siRNA knockdown, pharmacological inhibitors, phosphorylation site mutagenesis (T907), ErbB3 ubiquitination/degradation assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis established with multiple orthogonal KD experiments and phospho-site mutagenesis in a single study\",\n      \"pmids\": [\"17210635\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Nrdp1 (FLRF) overexpression in hematopoietic progenitor cells decreases steady-state levels of IL-3 receptor, EPO receptor, and RARα, and attenuates cytokine- and retinoic acid-induced erythroid/myeloid differentiation. Immunoprecipitation shows FLRF physically interacts with IL-3R, EPOR, and RARα in a ligand-independent manner.\",\n      \"method\": \"Overexpression in hematopoietic progenitor cell lines, immunoprecipitation, hematopoietic colony-forming assays, Western blot\",\n      \"journal\": \"Experimental hematology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus functional differentiation assay, single lab with two orthogonal methods\",\n      \"pmids\": [\"18495327\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Nrdp1 ubiquitinates Parkin in vitro and in cells in a dosage-dependent, proteasome-dependent manner. Overexpression of Nrdp1 increases reactive oxygen species (ROS) production, which is abrogated by co-expression of Parkin; Nrdp1 shRNA knockdown reduces ROS levels.\",\n      \"method\": \"In vitro ubiquitination assay, overexpression/knockdown in SH-SY5Y cells, ROS measurement\",\n      \"journal\": \"Neuroscience letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro ubiquitination plus cellular functional readout, single lab\",\n      \"pmids\": [\"18541373\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Nrdp1 directly binds and polyubiquitinates MyD88 (leading to its proteasomal degradation) and TBK1 (leading to its activation, not degradation), thereby suppressing MyD88-dependent NF-κB/AP-1 activation while promoting TBK1/IRF3-dependent IFN-β production in TLR-triggered macrophages. Nrdp1 knockdown inhibits MyD88 degradation and TBK1/IRF3 activation.\",\n      \"method\": \"Co-immunoprecipitation, in vivo ubiquitination assay, siRNA knockdown, transgenic mouse model (LPS challenge, VSV infection)\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, ubiquitination assays, RNAi, and in vivo genetic model providing convergent evidence\",\n      \"pmids\": [\"19483718\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RNF41 interacts with JAK2-associated cytokine receptor complexes (leptin receptor, LIF receptor, IL-6 receptor) and controls their surface levels dually: ectopic RNF41 blocks intracellular cathepsin-L-dependent receptor cleavage while enhancing ADAM metalloprotease-dependent ectodomain shedding.\",\n      \"method\": \"Co-immunoprecipitation, pharmacological inhibitors of cathepsin L and ADAMs, receptor surface/shedding assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus inhibitor-based pathway dissection, single lab, two orthogonal approaches\",\n      \"pmids\": [\"21378310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Androgen receptor (AR) transcriptionally upregulates Nrdp1 in androgen-dependent prostate cancer cells; AR activation promotes ErbB3 degradation in a Nrdp1-dependent manner. In castration-resistant prostate cancer, this AR-Nrdp1 regulatory axis is lost, leading to constitutively suppressed Nrdp1 and elevated ErbB3.\",\n      \"method\": \"Androgen withdrawal/AR activation experiments, Nrdp1 promoter analysis, Western blot for ErbB3 and Nrdp1, mouse xenograft model\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — AR manipulation experiments with Nrdp1 and ErbB3 readout, supported by in vivo xenograft, single lab\",\n      \"pmids\": [\"20587519\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Nrdp1 interacts with and mediates K63-linked polyubiquitination of the transcription factor C/EBPβ, which enhances C/EBPβ transcriptional activity and promotes M2 macrophage polarization (upregulation of Arg1 and other M2 markers) in response to IL-4. This represents a non-proteolytic ubiquitin-dependent pathway.\",\n      \"method\": \"Immunoprecipitation, K63-linked ubiquitination assay, reporter gene assay (Arg1 promoter), Nrdp1 knockdown/transgenic macrophages\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, K63 ubiquitination assay, reporter assay, and in vivo transgenic model; multiple orthogonal methods\",\n      \"pmids\": [\"22707723\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RNF41 ubiquitinates USP8 and reduces USP8 protein levels, redistributing USP8 from ESCRT-0-associated compartments to RNF41 bodies. Loss of USP8 destabilizes the ESCRT-0 complex and blocks lysosomal degradation of cytokine receptors while promoting their recycling. USP8 knockdown phenocopies RNF41 overexpression on leptin and LIF receptor trafficking.\",\n      \"method\": \"Immunoprecipitation, ubiquitination assays, USP8 siRNA knockdown, ESCRT-0 stability assays, receptor trafficking experiments\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, ubiquitination assays, RNAi epistasis, replicated across multiple receptor models in single lab with multiple orthogonal methods\",\n      \"pmids\": [\"23750007\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Par-1b (MARK2) kinase binds to and phosphorylates RNF41 on serine 254. This phosphorylation is required for epithelial cells to localize laminin-111 receptors to their basolateral surfaces, to properly anchor to laminin-111, and to establish apical-basal polarity.\",\n      \"method\": \"Kinase assay, phosphorylation site mutagenesis (S254), co-immunoprecipitation, laminin receptor localization assays, polarity assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, in vitro kinase assay, site mutagenesis and functional polarity readout, single lab\",\n      \"pmids\": [\"24259665\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Nrdp1 self-associates into a stable oligomeric complex in cells via its coiled-coil domain. Deletion of the coiled-coil domain abolishes oligomerization but does not affect ErbB3 ubiquitination/degradation. The coiled-coil domain is required for efficient Nrdp1 autoubiquitination via a trans mechanism, demonstrating that autoubiquitination and substrate ubiquitination are functionally separable.\",\n      \"method\": \"Chemical cross-linking, size exclusion chromatography, native PAGE, co-immunoprecipitation, domain deletion mutagenesis, ubiquitination assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal structural and biochemical methods plus mutagenesis in a single rigorous study\",\n      \"pmids\": [\"24519943\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Nrdp1 mediates K33-linked polyubiquitination of Zap70, which promotes dephosphorylation of Zap70 by phosphatases Sts1 and Sts2, thereby terminating early TCR signaling in CD8+ T cells. Nrdp1 physically interacts with Zap70 and with Sts1/Sts2 and connects K33-linked ubiquitin modification to Sts-mediated dephosphorylation.\",\n      \"method\": \"Co-immunoprecipitation, K33-specific ubiquitination assay, Nrdp1-deficient mouse T cells, Zap70 phosphorylation assays, Sts1/Sts2 dephosphorylation assays\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, linkage-specific ubiquitination, genetic knockout model with defined signaling readout, multiple orthogonal methods\",\n      \"pmids\": [\"26390156\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Nuclear filamin A (FLNA) is required for AR binding to the Nrdp1 androgen response element (ARE) and AR-mediated Nrdp1 transcription. Restoration of nuclear FLNA in castration-resistant prostate cancer cells re-establishes AR binding to the Nrdp1 promoter, increases Nrdp1 transcription and protein expression, and restores androgen responsiveness.\",\n      \"method\": \"ChIP assay, promoter ARE binding, nuclear FLNA restoration, qRT-PCR, Western blot\",\n      \"journal\": \"Endocrine-related cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and functional rescue experiment, single lab with two orthogonal methods\",\n      \"pmids\": [\"25759396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Lenalidomide promotes EpoR/RNF41 association and inhibits RNF41 auto-ubiquitination, leading to reduced EpoR ubiquitination and stabilization of EpoR at the cell surface. This effect is cereblon-independent. RNF41 overexpression reduces steady-state EpoR levels, and lenalidomide-induced EpoR upregulation is abrogated when cellular RNF41 is overexpressed.\",\n      \"method\": \"Co-immunoprecipitation, auto-ubiquitination assay, EpoR/RNF41 transfection, shRNA knockdown of CRBN, flow cytometry for EpoR surface levels\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, ubiquitination assay, and genetic rescue with RNF41 constructs, single lab\",\n      \"pmids\": [\"27197154\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Nrdp1 physically interacts with VANGL1 and VANGL2 (PCP pathway components) and mediates K63-linked polyubiquitination of the DEP domain of Dishevelled (Dvl). This ubiquitination impairs Dvl binding to phosphatidic acid, blocking Dvl recruitment to the plasma membrane upon Wnt/Fzd stimulation and thereby suppressing PCP signaling and GBM cell migration.\",\n      \"method\": \"Co-immunoprecipitation, K63 ubiquitination assay, Dvl-phosphatidic acid binding assay, siRNA knockdown, migration/invasion assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, K63 ubiquitination, and lipid-binding assay with functional migration readout, single lab\",\n      \"pmids\": [\"28481871\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RNF41 interacts with VPS52 (a subunit of the GARP and EARP complexes) via coiled-coil domain interactions. RNF41 ubiquitinates VPS52 and relocates it away from VPS53 (another GARP/EARP subunit) towards RNF41 bodies, revealing a role for RNF41 in regulating intracellular vesicle trafficking machinery.\",\n      \"method\": \"Array MAPPIT protein-protein interaction screen, co-immunoprecipitation, ubiquitination assay, co-localization microscopy\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — MAPPIT screen plus co-IP and ubiquitination assay, single lab with multiple methods but no in vitro reconstitution\",\n      \"pmids\": [\"28542518\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RNF41 ubiquitinates SGT1 in a phosphorylation-dependent manner, promoting SGT1 degradation and causing defective kinetochore assembly. The phosphatase PHLPP1 dephosphorylates SGT1 at Ser-17, Ser-249, Ser-289, and Thr-233, preventing SGT1 association with RNF41 and thereby protecting it from degradation. Depletion of RNF41 or expression of non-phosphorylatable SGT1 rescues kinetochore defects caused by PHLPP1 loss.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, phosphorylation site mutagenesis, PHLPP1/RNF41 knockdown, kinetochore assembly assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis by genetic rescue, co-IP, ubiquitination assay, and phosphorylation mutagenesis in single study\",\n      \"pmids\": [\"28696259\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Clec16a, Nrdp1, and USP8 form a tripartite ubiquitin-dependent complex that regulates β-cell mitophagy. Clec16a is an E3 ligase that promotes nondegradative ubiquitin conjugates to stabilize the complex. RNF41/Nrdp1 is a component of this mitophagy regulatory complex in pancreatic β-cells and is required for mitochondrial quality control, oxygen consumption, and insulin secretion.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, genetic knockdown/overexpression in β-cells, mitophagy flux assays, metabolic readouts\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, ubiquitination assay, and functional metabolic readout, single lab with multiple methods\",\n      \"pmids\": [\"29180353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RNF41 was identified as a driver of anti-HER3 antibody (IgG 95) anti-proliferative activity via shRNA library screen. RNF41 is responsible for HER3 ubiquitination and downregulation upon antibody treatment, and RNF41 downregulation itself is a mechanism for acquired resistance to anti-HER3 antibody treatment.\",\n      \"method\": \"shRNA library screen (ubiquitin proteasome system), HER3 ubiquitination assay, receptor internalization/degradation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional genomics screen with follow-up ubiquitination and receptor downregulation validation, single lab\",\n      \"pmids\": [\"30523157\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"AP2S1 (a clathrin adaptor subunit) was identified as an RNF41 interaction partner by multi-orthogonal interactome screen. RNF41 stabilizes and relocates AP2S1, and AP2S1 plays a role in leptin and LIF receptor signaling downstream of RNF41.\",\n      \"method\": \"Affinity purification-mass spectrometry, BioID, Virotrap, microarray MAPPIT, Y2H, functional validation with AP2S1 knockdown/overexpression\",\n      \"journal\": \"Journal of proteome research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal interaction methods plus functional validation, single lab\",\n      \"pmids\": [\"29560723\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RNF41 binds CACYBP via its C-terminal substrate-binding domain, ubiquitinates CACYBP, and promotes its degradation via both proteasome- and lysosome-dependent pathways. RNF41-mediated CACYBP degradation attenuates CACYBP-induced Ser10 phosphorylation and cytoplasmic retention of p27Kip1, thereby restricting cell cycle progression.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, proteasome/lysosome inhibitor experiments, immunofluorescence for p27 localization, cell cycle assays\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, ubiquitination assay, and mechanistic cell biology readout, single lab\",\n      \"pmids\": [\"31754404\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RNF41 directly binds and ubiquitinates the extracellular domains of the dendritic cell receptor Clec9A. At steady-state, RNF41 ubiquitination of Clec9A facilitates interactions with ER-associated degradation proteins to control Clec9A levels; following dead cell uptake, Clec9A interactions shift to favor antigen cross-presentation. RNF41 is a negative regulator of Clec9A-mediated cross-presentation.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay targeting extracellular domain, RNF41 knockout dendritic cells, antigen cross-presentation assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, ubiquitination assay, genetic KO with functional antigen presentation readout; multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"33264090\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"A20 interacts with Nrdp1/RNF41 in LPS-stimulated cells. The ZnF4 domain of A20 is required for Nrdp1 polyubiquitination. A20 knockout decreases K48-linked ubiquitination of MyD88 (reducing its degradation) but increases K63-linked ubiquitination of TBK1. Combined A20 and Nrdp1 inhibition shows that A20/Nrdp1 interaction is important for A20 anti-inflammatory effects by modulating the balance between MyD88 degradation and TBK1 activation.\",\n      \"method\": \"Mass spectrometry screen, co-immunoprecipitation, A20 knockout, Nrdp1 knockdown, linkage-specific ubiquitination assays, domain mutagenesis (ZnF4), cytokine secretion assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus K48/K63 linkage-specific ubiquitination assays plus domain mutagenesis, single lab\",\n      \"pmids\": [\"34023381\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NRDP1 is present in both cytoplasm and nucleus of prostate cancer cells. Its nuclear translocation is associated with androgen receptor (AR) activity; binding of NRDP1 to AR requires the AR hinge region. Nuclear NRDP1 retains ubiquitin ligase activity.\",\n      \"method\": \"Subcellular fractionation, immunohistochemistry, immunofluorescence with confocal microscopy, co-immunoprecipitation with AR constructs, HA-ubiquitin co-transfection assay\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — subcellular fractionation plus co-IP with mutagenesis of AR hinge region plus functional ubiquitin assay, single lab\",\n      \"pmids\": [\"34503235\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RNF41 promotes ubiquitination and degradation of ASB6 through direct interaction mediated by binding to FXR2 (which stabilizes RNF41 mRNA). Silencing RNF41 counteracts circFNDC3B-mediated suppression of colorectal cancer stemness and metastasis, placing RNF41-mediated ASB6 degradation downstream of the circFNDC3B-FXR2 axis.\",\n      \"method\": \"Co-immunoprecipitation, RNA immunoprecipitation, RNA pull-down, ubiquitination assay, siRNA knockdown, in vivo xenograft\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, ubiquitination assay, and genetic epistasis with functional cancer biology readout, single lab\",\n      \"pmids\": [\"36446779\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"The CLEC16A internal intrinsically disordered protein region (IDPR) is the site where RNF41 binds and acts to destabilize CLEC16A, promoting its degradation and thereby controlling the reciprocal regulatory balance within the CLEC16A-RNF41-USP8 mitophagy complex. Loss of this IDPR also destabilizes the tripartite complex.\",\n      \"method\": \"NMR and CD spectroscopy (IDPR confirmation), co-immunoprecipitation, ubiquitination assays, deletion mutagenesis of IDPR\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR/CD structural validation of IDPR plus co-IP and functional degradation assays, single lab\",\n      \"pmids\": [\"36822331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Global deletion of Nrdp1 in mice leads to male infertility by disrupting autophagy-associated acrosome biogenesis and mitochondrial arrangement during spermiogenesis. Nrdp1 deletion increases Parkin levels but decreases SIP/CacyBP, Drp1, and Tim23 in sperm, inhibiting autophagy. This establishes a functional role for Nrdp1 in promoting autophagy during spermiogenesis via its known substrates.\",\n      \"method\": \"Nrdp1 knockout mouse, quantitative proteomics, autophagy flux assays, Western blot, sperm morphology analysis\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout with quantitative proteomics and functional autophagy readout, single lab\",\n      \"pmids\": [\"37759433\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RNF41 induces K27- and K63-linked non-canonical polyubiquitination of MYO1C to enhance its stability, which promotes actin remodeling and prostate cancer bone metastasis. RNF41 silencing reduces MYO1C levels and suppresses metastasis in an intra-arterial bone metastasis xenograft model.\",\n      \"method\": \"Co-immunoprecipitation, K27/K63-specific ubiquitination assay, RNF41 silencing, in vitro migration/invasion assays, in vivo bone metastasis xenograft model\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — linkage-specific ubiquitination assay plus in vivo functional validation, single lab\",\n      \"pmids\": [\"39112516\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"VEGF activates CHIP, which triggers Nrdp1 degradation in vascular endothelial cells. Nrdp1 deficiency increases secretion of Fam20C (a secretory kinase), which induces degradation of extracellular matrix and disrupts vascular basement membrane integrity, thereby promoting tumor metastasis. Nrdp1 normally targets Fam20C for degradation to maintain vascular basement membrane integrity.\",\n      \"method\": \"Conditional Nrdp1 knockout mice (endothelial-specific), co-immunoprecipitation, ubiquitination assay, Fam20C secretion assay, in vivo lung metastasis model, VEGF treatment experiments\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO mouse plus mechanistic ubiquitination and secretion assays, single lab\",\n      \"pmids\": [\"38654108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RNF41 directly interacts with NUDC and ubiquitinates it to promote its proteasomal degradation. RNF41 loss leads to increased NUDC stability, which enhances β-tubulin polymerization and promotes bladder cancer lung metastasis.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, RNF41 knockdown and overexpression, in vitro migration/invasion assays, tail vein lung metastasis model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, ubiquitination assay, and in vivo functional model, single lab\",\n      \"pmids\": [\"40494872\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RNF41/Nrdp1 is a RING finger/RBCC-family E3 ubiquitin ligase that promotes both degradative (K48-linked) and non-degradative (K33, K63, K27) polyubiquitination of a diverse substrate repertoire—including ErbB3, ErbB4, BRUCE/BIRC6, Parkin, MyD88, TBK1, USP8, Zap70, C/EBPβ, Dvl, SGT1, Clec9A, CACYBP, MYO1C, VPS52, NUDC, Fam20C, and ASB6—to regulate receptor tyrosine kinase turnover, innate immune signaling, TCR termination, apoptosis, autophagy/mitophagy, cell polarity, and cancer cell migration; its activity is itself controlled by auto-ubiquitination (promoting self-degradation), coiled-coil domain-dependent oligomerization (required for efficient auto-ubiquitination in trans), stabilization by the deubiquitinase USP8, phosphorylation by Par-1b/MARK2 (Ser254), and transcriptional regulation by the androgen receptor in a nuclear filamin A-dependent manner.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RNF41 (Nrdp1/FLRF) is a RING finger E3 ubiquitin ligase that controls the abundance, surface display, and signaling output of a broad set of receptors and intracellular regulators through both degradative and non-degradative polyubiquitination [#0, #9]. Its founding substrate is the receptor tyrosine kinase ErbB3/HER3, which it binds through a structurally defined C-terminal substrate-recognition domain and targets for proteasomal degradation via its RING domain [#0, #4, #23]. RNF41 activity is self-limiting: it undergoes RING-dependent autoubiquitination that drives its own turnover, and its coiled-coil domain mediates oligomerization required for efficient autoubiquitination in trans—a step functionally separable from substrate ubiquitination [#2, #15]. RNF41 stability is set by a reciprocal relationship with the deubiquitinase USP8, which binds RNF41 through its rhodanese domain and stabilizes it, while RNF41 in turn ubiquitinates USP8 and remodels endosomal/ESCRT-0-associated trafficking of cytokine receptors [#2, #5, #13]. Through linkage-selective ubiquitination, RNF41 acts as a signaling switch rather than a simple degrader: it degrades MyD88 while activating TBK1 to bias TLR responses toward type I interferon, mediates K63 ubiquitination of C/EBPβ to drive M2 macrophage polarization, and applies K33-linked ubiquitin to ZAP70 to license Sts-phosphatase-mediated termination of TCR signaling [#9, #12, #16]. This ligase logic extends across receptor turnover, innate and adaptive immunity, apoptosis via BRUCE/Apollon degradation, autophagy/mitophagy through a CLEC16A–RNF41–USP8 complex and Parkin regulation, cell polarity, and cancer cell migration and metastasis [#1, #3, #22, #30, #32]. In prostate cancer, the androgen receptor transcriptionally upregulates RNF41 in a nuclear filamin A-dependent manner to drive ErbB3 degradation, an axis lost in castration-resistant disease [#11, #17].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established RNF41 as a bona fide RING E3 ligase and defined its founding substrate, answering what enzymatic activity and target the protein has.\",\n      \"evidence\": \"Cell-free ubiquitination with E2 UbcH5, co-IP, and proteasome inhibitor degradation assays on ErbB3\",\n      \"pmids\": [\"12411582\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define linkage type of ErbB3 ubiquitin chains\", \"Substrate-recognition surface not mapped structurally at this stage\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Showed RNF41 controls its own abundance through autoubiquitination and is reciprocally stabilized by USP8, establishing the core regulatory loop governing ligase levels.\",\n      \"evidence\": \"Autoubiquitination/stability assays, reciprocal co-IP, and catalytic-dead USP8 mutagenesis; separately BRUCE/Apollon degradation by RNAi and apoptosis assays\",\n      \"pmids\": [\"15314180\", \"14765125\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of RNF41–USP8 binding not yet resolved\", \"How USP8 and autoubiquitination are dynamically balanced not defined\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Extended the substrate repertoire to Parkin, showing RNF41 can regulate another E3 ligase and indirectly its downstream substrates.\",\n      \"evidence\": \"Y2H, in vitro binding, co-IP, co-localization, and pulse-chase half-life measurement\",\n      \"pmids\": [\"15632191\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological context of Parkin regulation not established in this study\", \"Chain linkage on Parkin not characterized\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Provided structural definition of the substrate-binding and USP8-interaction surfaces, explaining how RNF41 selects targets and partners.\",\n      \"evidence\": \"X-ray crystallography of the C-terminal domain and of the USP8 rhodanese–RNF41 complex, with mutagenesis\",\n      \"pmids\": [\"17384230\", \"17035239\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length structure including RING and coiled-coil not solved\", \"Predicted consensus binding motif across targets not experimentally validated for all substrates\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Placed RNF41 in a regulated signaling cascade, showing ligand-driven kinase signaling tunes RNF41 stability and receptor turnover.\",\n      \"evidence\": \"siRNA, inhibitors, and USP8 T907 phospho-site mutagenesis defining a NRG1→Akt→USP8→Nrdp1→ErbB3 axis\",\n      \"pmids\": [\"17210635\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other ligands feed this axis not tested\", \"Direct kinase–substrate stoichiometry not quantified\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Broadened the receptor target set to hematopoietic cytokine receptors and linked RNF41 to differentiation and ROS, suggesting a general role in receptor homeostasis.\",\n      \"evidence\": \"Overexpression/knockdown in progenitor and SH-SY5Y cells, co-IP, colony assays, ROS measurement\",\n      \"pmids\": [\"18495327\", \"18541373\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ubiquitination of IL-3R/EPOR/RARα not shown\", \"ROS link to Parkin is correlative in cell overexpression\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Revealed RNF41 as a signaling switch in innate immunity that degrades one effector while activating another, demonstrating non-degradative ubiquitination function in vivo.\",\n      \"evidence\": \"Reciprocal co-IP, in vivo ubiquitination, siRNA, and transgenic mouse LPS/VSV challenge for MyD88 and TBK1\",\n      \"pmids\": [\"19483718\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Chain linkages distinguishing degradative vs activating outcomes not fully resolved here\", \"Mechanism by which TBK1 ubiquitination promotes activation not detailed\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Connected RNF41 to receptor trafficking decisions and to transcriptional control by the androgen receptor, linking ligase abundance to cancer-relevant receptor levels.\",\n      \"evidence\": \"Co-IP and protease inhibitor dissection of cytokine receptor cleavage/shedding; AR activation, promoter analysis, and xenografts for the AR–Nrdp1–ErbB3 axis\",\n      \"pmids\": [\"21378310\", \"20587519\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct mechanism coupling RNF41 to cathepsin-L vs ADAM activities unclear\", \"How AR-driven RNF41 loss arises in castration resistance not mechanistically defined here\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrated K63-linked, non-proteolytic ubiquitination as a means to enhance transcription factor activity, expanding RNF41's mechanistic repertoire.\",\n      \"evidence\": \"Co-IP, K63 ubiquitination assay, Arg1 reporter, and transgenic macrophage M2 polarization readouts on C/EBPβ\",\n      \"pmids\": [\"22707723\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Site of C/EBPβ ubiquitination not mapped\", \"How K63 chains enhance transcriptional activity mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined RNF41's role in ESCRT/endosomal trafficking and the regulated phosphorylation input controlling polarity, integrating ligase activity into membrane and cytoskeletal organization.\",\n      \"evidence\": \"Ubiquitination and RNAi epistasis on USP8/ESCRT-0 receptor trafficking; MARK2/Par-1b kinase assay and S254 mutagenesis for polarity\",\n      \"pmids\": [\"23750007\", \"24259665\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How S254 phosphorylation alters RNF41 activity biochemically not defined\", \"Nature of 'RNF41 bodies' compartment not characterized\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed coiled-coil-dependent oligomerization drives trans-autoubiquitination separable from substrate ubiquitination, clarifying how self-regulation and target turnover are mechanistically distinct.\",\n      \"evidence\": \"Cross-linking, SEC, native PAGE, domain deletion, and parallel ErbB3 vs auto-ubiquitination assays\",\n      \"pmids\": [\"24519943\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Oligomer stoichiometry and architecture not structurally determined\", \"Whether oligomerization influences substrate selectivity untested\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established a distinct K33 linkage coupling ubiquitination to phosphatase recruitment for TCR signal termination, and resolved the nuclear AR–filamin A requirement for RNF41 transcription.\",\n      \"evidence\": \"K33-specific ubiquitination, Nrdp1-knockout T cells, Sts1/2 dephosphorylation assays on ZAP70; ChIP and nuclear FLNA restoration for AR-driven transcription\",\n      \"pmids\": [\"26390156\", \"25759396\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How K33 chains physically recruit Sts phosphatases not structurally shown\", \"Generality of K33 mechanism to other substrates unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Greatly expanded the substrate landscape to vesicle trafficking, kinetochore assembly, cell cycle, mitophagy, and PCP/migration, showing phosphorylation-gated substrate recognition.\",\n      \"evidence\": \"Co-IP, linkage-specific and phospho-dependent ubiquitination assays, MAPPIT screens, and functional readouts on VPS52, SGT1/PHLPP1, CLEC16A/USP8, CACYBP, and Dvl/VANGL\",\n      \"pmids\": [\"28542518\", \"28696259\", \"29180353\", \"31754404\", \"28481871\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vitro reconstitution lacking for several substrates\", \"How phosphorylation switches substrate affinity not generalized across targets\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Linked RNF41 to therapeutic receptor modulation and refined its interactome, positioning it as both a driver of anti-HER3 antibody efficacy and a node in clathrin-adaptor-dependent receptor signaling.\",\n      \"evidence\": \"shRNA screen with HER3 ubiquitination follow-up; multi-orthogonal interactome (AP-MS, BioID, Virotrap, MAPPIT, Y2H) and AP2S1 functional validation\",\n      \"pmids\": [\"30523157\", \"29560723\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of acquired resistance via RNF41 loss not fully dissected\", \"AP2S1 functional pathway downstream of RNF41 incompletely defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed RNF41 ubiquitinates a receptor extracellular domain to gate ERAD versus cross-presentation, demonstrating context-dependent fate control of an immune receptor.\",\n      \"evidence\": \"Co-IP, extracellular-domain ubiquitination assay, and RNF41-knockout dendritic cell cross-presentation assays on Clec9A\",\n      \"pmids\": [\"33264090\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How dead-cell uptake switches Clec9A interaction partners mechanistically unclear\", \"Topology of extracellular-domain ubiquitination not structurally resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Embedded RNF41 in the A20 anti-inflammatory program and confirmed nuclear, catalytically active RNF41 bound to AR, refining its roles in immune signaling balance and prostate cancer.\",\n      \"evidence\": \"MS screens, co-IP, A20 ZnF4 mutagenesis with K48/K63 linkage assays; subcellular fractionation and AR hinge-region co-IP with ubiquitin assay\",\n      \"pmids\": [\"34023381\", \"34503235\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Nuclear RNF41 substrates not identified\", \"Directionality of A20–RNF41 ubiquitin transfer not fully resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Mapped the intrinsically disordered region in CLEC16A as the RNF41 binding/destabilization site and established an in vivo requirement for RNF41 in autophagy-dependent spermiogenesis.\",\n      \"evidence\": \"NMR/CD with co-IP and degradation assays on the CLEC16A IDPR; Nrdp1-knockout mouse proteomics and sperm morphology analysis\",\n      \"pmids\": [\"36822331\", \"37759433\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How the tripartite complex balance is set in vivo not quantified\", \"Causal contribution of individual substrates to infertility phenotype not isolated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined opposing pro- and anti-metastatic roles via non-canonical stabilizing ubiquitination of MYO1C and degradation of secreted Fam20C, showing RNF41 outputs are context- and substrate-specific.\",\n      \"evidence\": \"K27/K63-specific ubiquitination assays, endothelial-specific and tumor knockdown models, and in vivo bone/lung metastasis xenografts\",\n      \"pmids\": [\"39112516\", \"38654108\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How linkage choice (stabilizing vs degradative) is determined per substrate unresolved\", \"Upstream signals selecting MYO1C vs Fam20C engagement unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Added NUDC as a degradative substrate linking RNF41 to microtubule dynamics and metastasis suppression, reinforcing its broad role in cytoskeletal and cancer cell behavior.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, knockdown/overexpression, and tail-vein lung metastasis model\",\n      \"pmids\": [\"40494872\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Chain linkage on NUDC not specified\", \"In vitro reconstitution not performed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved what molecular code dictates RNF41's choice between degradative (K48) and non-degradative (K27/K33/K63) chain linkages on different substrates and how upstream signals select among its many targets.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying rule linking substrate phosphorylation/context to chain-linkage output\", \"No full-length structural model integrating RING, coiled-coil oligomerization, and substrate domain\", \"Identity of nuclear RNF41 substrates undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [0, 1, 9, 12, 16, 26, 32]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 9, 13, 25, 34]},\n      {\"term_id\": \"GO:0061630\", \"supporting_discovery_ids\": [0, 15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [28, 31]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [28]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [13]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [22, 31]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 2, 13]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [9, 12, 16, 26, 27]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [22, 30, 31]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [9, 16, 19]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [11, 23, 32, 34]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"complexes\": [\n      \"CLEC16A-RNF41-USP8 mitophagy complex\"\n    ],\n    \"partners\": [\n      \"ERBB3\",\n      \"USP8\",\n      \"PARK2\",\n      \"MYD88\",\n      \"TBK1\",\n      \"ZAP70\",\n      \"CLEC16A\",\n      \"VPS52\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}