{"gene":"RBX1","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":2002,"finding":"Crystal structure of the Cul1-Rbx1-Skp1-F-box(Skp2) SCF complex reveals that Rbx1 binds the globular domain of Cul1 through an intermolecular beta-sheet, forming a two-subunit catalytic core that recruits the E2 ubiquitin-conjugating enzyme. Cul1 acts as a rigid scaffold holding Rbx1 and the substrate-recognition complex >100 Å apart.","method":"X-ray crystallography with functional validation via Cul1 scaffold rigidity mutations","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus mutagenesis in a landmark, widely replicated study","pmids":["11961546"],"is_preprint":false},{"year":1999,"finding":"Rbx1 is a component of the endogenous VHL tumor suppressor complex (elongin B/C–Cul2–VHL) and SCF ubiquitin ligase complexes. It contains a RING-H2 finger motif, interacts with Cullins, and its yeast homolog is a subunit and potent activator of the SCFCdc4 ubiquitin ligase required for ubiquitination of Sic1 and G1-to-S transition.","method":"Co-immunoprecipitation from rat liver, yeast genetic and biochemical studies","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, yeast epistasis, independently replicated in companion paper (PMID:10213692)","pmids":["10213691"],"is_preprint":false},{"year":1999,"finding":"Rbx1 promotes association of E2 Cdc34 with Cdc53 and stimulates Cdc34 auto-ubiquitination in the context of Cdc53 or SCF complexes. Phosphorylated G1 cyclin Cln1 ubiquitination was reconstituted in vitro with SCFGrr1, Rbx1, and Cdc34, directly demonstrating Rbx1's role in E3 catalytic activity.","method":"In vitro ubiquitination reconstitution assay with purified components","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 / Strong — full in vitro reconstitution with purified components, replicated in companion paper","pmids":["10213692"],"is_preprint":false},{"year":1999,"finding":"The Cdc53/Rbx1 and Cul2/Rbx1 modules activate conjugation of the ubiquitin-like protein Rub1 (NEDD8) to Cdc53 and Cul2 by the dedicated E2 Ubc12, identifying Rbx1 as a common component of both ubiquitin and Rub1 (neddylation) modification enzyme systems.","method":"In vitro neddylation assay with purified Cdc53/Rbx1 and Cul2/Rbx1 modules","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of neddylation activity, single focused study with clear biochemical readout","pmids":["10579999"],"is_preprint":false},{"year":2004,"finding":"VHL specifically interacts with endogenous Cul2-Rbx1 in mammalian cells (not Cul5-Rbx2), whereas SOCS-box proteins associate with Cul5-Rbx2. Domain-swapping analyses showed that specificity for Cul2-Rbx1 vs. Cul5-Rbx2 is determined by the Cul2-box or Cul5-box sequences of substrate adaptors. RNAi-mediated knockdown of Cul2-Rbx1 inhibited VHL-mediated degradation of HIF-2α.","method":"Co-immunoprecipitation, domain-swap mutagenesis, RNAi knockdown","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, mutagenesis, and functional RNAi knockdown with substrate readout","pmids":["15601820"],"is_preprint":false},{"year":2005,"finding":"USP15, a deubiquitinating enzyme associated with the COP9 signalosome, stabilizes Rbx1 by reversing its poly/auto-ubiquitination. The zinc finger of USP15 is essential for this rescue; a single cysteine mutation in the zinc finger abolishes USP15's ability to stabilize Rbx1.","method":"Co-transfection, pulldown, ubiquitination assay, site-directed mutagenesis","journal":"Current Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional cotransfection plus mutagenesis, single lab","pmids":["16005295"],"is_preprint":false},{"year":2005,"finding":"Mutational analysis of Rbx1's RING finger residue D97 (the atypical 8th coordination residue) showed that aspartate is superior to cysteine for cullin neddylation activity. Different D97 mutants exhibit distinct activities across 6 Cullins, and specific mutants discriminate between neddylation activity and involvement in VBC-Cul2 ubiquitylation. Rbx1 mutants also destabilize VBC-Cul2 but not SCF, indicating complex-specific stability roles.","method":"Site-directed mutagenesis, in vitro neddylation and ubiquitination assays","journal":"Genes to cells","confidence":"High","confidence_rationale":"Tier 1 / Moderate — systematic mutagenesis with multiple in vitro activity assays, single lab","pmids":["15966899"],"is_preprint":false},{"year":2009,"finding":"RBX1/ROC1 silencing by siRNA in human cancer cells induces sequential G2-M arrest, apoptosis, and senescence. G2-M arrest is associated with accumulation of 14-3-3σ and loss of cyclin B1/Cdc2; apoptosis involves accumulation of Puma and reduction of Bcl-2/Mcl-1/survivin; senescence is coupled with DNA damage in p53/p21- and p16/pRb-independent manners.","method":"siRNA knockdown, cell cycle analysis, apoptosis assays, Western blot","journal":"Cancer Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with multiple defined phenotypic readouts, single lab","pmids":["19509229"],"is_preprint":false},{"year":2009,"finding":"Mouse Rbx1 gene-trap disruption causes embryonic lethality at E7.5 due to proliferation failure. p27 accumulates at high levels in Rbx1-null embryos. Simultaneous loss of p27 partially rescues lethality to E9.5, demonstrating that Rbx1-dependent p27 degradation is essential for early embryonic cell proliferation.","method":"Gene-trap mouse knockout, genetic epistasis (double knockout with p27), immunostaining","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knockout with genetic rescue (epistasis), clearly defined phenotype and substrate","pmids":["19325126"],"is_preprint":false},{"year":2009,"finding":"The INrf2/Cul3-Rbx1 complex is imported into the nucleus via prothymosin-alpha binding to the DGR region of INrf2. Inside the nucleus, the complex exchanges prothymosin-alpha for Nrf2, leading to Nrf2 ubiquitination and degradation. Cul3 and Rbx1 require INrf2 for nuclear import.","method":"Co-immunoprecipitation, subcellular fractionation, siRNA knockdown, co-transfection","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, fractionation, siRNA, single lab with multiple methods","pmids":["19279002"],"is_preprint":false},{"year":2010,"finding":"RBX1 silencing in human cancer cells causes accumulation of DNA replication licensing proteins CDT1 and ORC1, leading to DNA double-strand breaks, DNA damage response (DDR), G2 arrest, and aneuploidy. CHK1 activation is responsible for G2 arrest. In C. elegans, RBX-1 silencing causes CDT-1 accumulation and DDR; simultaneous CDT-1 silencing largely abrogates this DDR.","method":"siRNA knockdown, RNAi in C. elegans, DNA damage markers (γH2AX), genetic epistasis","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function in two organisms, genetic rescue in C. elegans, multiple biochemical readouts","pmids":["21115485"],"is_preprint":false},{"year":2010,"finding":"Nrf2 controls its own degradation by transcriptionally inducing Cul3 and Rbx1 gene expression via antioxidant response elements (AREs) in their promoters. Increased Cul3-Rbx1 then ubiquitinates and degrades Nrf2, forming a feedback autoregulatory loop.","method":"Promoter mutagenesis, transfection, siRNA, ARE reporter assays","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter mutagenesis plus siRNA and overexpression, single lab","pmids":["20452971"],"is_preprint":false},{"year":2010,"finding":"Molecular dynamics simulations demonstrate that the flexible linker of Rbx1 undergoes conformational changes that allow CRL neddylation and initiation of ubiquitination even before neddylation occurs, and that large NEDD8-induced CRL conformational changes are retained after deneddylation, enabling continued ubiquitin chain elongation post-deneddylation.","method":"Molecular dynamics simulation, mutational analysis of cullin acceptor lysine","journal":"Biophysical Journal","confidence":"Low","confidence_rationale":"Tier 4 / Weak — computational simulation only, no in vitro or in vivo validation reported","pmids":["20682250"],"is_preprint":false},{"year":2012,"finding":"Crystal structure of a GLMN-RBX1-CUL1 fragment complex reveals that Glomulin (GLMN) adopts a HEAT-like repeat fold that tightly binds the E2-interacting surface of the RBX1 RING domain, competitively inhibiting E2 (CDC34) recruitment and CRL-mediated ubiquitin chain formation. Disease-associated GVM mutations disrupt the GLMN-RBX1 interface.","method":"X-ray crystallography, biochemical ubiquitination inhibition assay, mutagenesis","journal":"Molecular Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with biochemical validation and disease-mutation analysis","pmids":["22748924"],"is_preprint":false},{"year":2012,"finding":"Glomulin (Glmn) binds directly to the RING domain of Rbx1 and inhibits its E3 ubiquitin ligase activity. Loss of Glmn increases turnover of Fbw7 and consequently elevated levels of Cyclin E and c-Myc, all reversible by CRL or proteasome inhibition.","method":"Direct binding assay, genetic loss-of-function, Western blot, proteasome/CRL inhibitors","journal":"Molecular Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding demonstrated, genetic LOF with substrate readout, replicated across cells and tissues","pmids":["22405651"],"is_preprint":false},{"year":2012,"finding":"Antioxidant-induced phosphorylation of INrf2 (Keap1) Tyr85 controls nuclear export of the INrf2-Cul3-Rbx1 complex. Mutation of Tyr85 blocks nuclear export of INrf2 and co-blocks Cul3-Rbx1 export, demonstrating that Cul3-Rbx1 exits the nucleus as a complex with INrf2. Newly synthesized INrf2-Cul3-Rbx1 re-imports to degrade nuclear Nrf2 post-induction.","method":"Site-directed mutagenesis, subcellular fractionation, siRNA, immunofluorescence","journal":"Journal of Cell Science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis plus siRNA with localization readout, single lab","pmids":["22448038"],"is_preprint":false},{"year":2012,"finding":"RBX1 knockdown triggers autophagy through accumulation of DEPTOR, an mTOR-inhibitory CRL substrate, thereby activating the DEPTOR-mTOR axis. Blockage of autophagy upon RBX1 knockdown enhances apoptosis, showing that this autophagy is a protective/survival response.","method":"siRNA knockdown, Western blot for DEPTOR/mTOR substrates, autophagy assays","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — substrate identification combined with functional autophagy readout, single lab","pmids":["22965024"],"is_preprint":false},{"year":2012,"finding":"ER stress induces caspase-dependent cleavage of RBX1 eight amino acids from the N-terminus during B-cell plasma cell differentiation. Yeast expressing the N-terminally cleaved human RBX1 (Δ8) are hypersensitive to ER stress and impaired in CRL-mediated ubiquitination and degradation, demonstrating that the N-terminal region is required for RBX1 function.","method":"Biochemical cleavage assay, yeast complementation, ubiquitination assay, ER stress induction","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast complementation with mutant plus in vitro ubiquitination, single lab","pmids":["22822056"],"is_preprint":false},{"year":2014,"finding":"Cullin 2-RBX1 E3 ligase interacts with RhoB and promotes its ubiquitination and degradation in liver cancer cells; this requires NEDD8 conjugation (neddylation) for activation. Inhibition of the neddylation-CRL pathway causes RhoB accumulation and contributes to p21/p27 induction and apoptosis.","method":"Co-immunoprecipitation, iTRAQ quantitative proteomics, siRNA knockdown, ubiquitination assay","journal":"Molecular & Cellular Proteomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus quantitative proteomics and functional ubiquitination assay, single lab","pmids":["25540389"],"is_preprint":false},{"year":2016,"finding":"Rotavirus NSP1 hijacks the host Cullin-3-Rbx1 CRL complex to mediate strain-specific β-TrCP degradation. NSP1 localizes to the Golgi with the Cul3-Rbx1 complex, which targets β-TrCP and NSP1 for co-destruction at the proteasome. siRNA silencing or chemical inhibition of Cul3 or Rbx1 impairs this β-TrCP degradation.","method":"Tandem-affinity purification/MS, siRNA knockdown, chemical inhibition, co-localization imaging","journal":"PLoS Pathogens","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — AP-MS interaction plus siRNA functional validation, single lab","pmids":["27706223"],"is_preprint":false},{"year":2017,"finding":"Crystal structure of the pentameric CRL2VHL complex (Cul2-Rbx1-EloBC-pVHL) reveals full-length Cul2 architecture and a new pose of Rbx1 in a trajectory from closed to open conformation. Hotspots at the Cul2-pVHL-EloBC interface were identified, and mutations defining selectivity switch for Cul2 vs. Cul5 recognition were characterized.","method":"X-ray crystallography, isothermal titration calorimetry, mutagenesis","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with biophysical validation and mutagenesis in a single rigorous study","pmids":["28591624"],"is_preprint":false},{"year":2018,"finding":"The Cullin-3-Rbx1-KCTD10 E3 ligase complex mediates K63-linked polyubiquitination of RhoB at lysines 162 and 181 in primary endothelial cells, targeting RhoB to lysosomes and regulating endothelial barrier integrity via RhoB-mediated cell contraction.","method":"Co-immunoprecipitation, ubiquitination assay, site-directed mutagenesis (K162/K181), siRNA knockdown, endothelial permeability assay","journal":"Journal of Cell Biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, mutagenesis identifying specific ubiquitination sites, functional barrier assay, single lab with multiple orthogonal methods","pmids":["29358211"],"is_preprint":false},{"year":2018,"finding":"Arsenite binds directly to the RING finger domain of Rbx1 in vitro and in cells, suppressing Cul3-Rbx1 E3 ubiquitin ligase activity, thereby impairing Nrf2 ubiquitination and activating the Nrf2 antioxidant signaling pathway.","method":"In vitro and cellular RING-domain binding assay, ubiquitination assay","journal":"Chemical Research in Toxicology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding to RING domain shown with functional ubiquitination readout, single lab","pmids":["29658272"],"is_preprint":false},{"year":2018,"finding":"RBX1 is a novel E3 ligase for SESN2 (Sestrin 2), mediating its K48-linked ubiquitination upon prolonged mitochondrial damage in SH-SY5Y cells. Downregulation of RBX1 stabilizes SESN2 and reduces cell death, identifying a direct RBX1-SESN2 interaction.","method":"Co-immunoprecipitation, ubiquitination assay (K48-linkage), siRNA knockdown, overexpression","journal":"Molecular and Cellular Biochemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP plus K48-specific ubiquitination assay, single lab, single study","pmids":["29294217"],"is_preprint":false},{"year":2019,"finding":"RBX1 expression is elevated in G1 phase cells and promotes neddylation of Cullin1, thereby driving G1 phase-specific ubiquitination and degradation of EXO1, which limits homologous recombination (HR) DNA repair in G1. Knockdown of RBX1 in G1-phase cells increases EXO1 levels, DSB end resection, and HR activity. DNA-PKcs autophosphorylation at S2056 is responsible for elevated RBX1 in G1; its inhibition decreases RBX1 and increases EXO1.","method":"siRNA knockdown, Western blot, immunofluorescence (RPA32/BrdU/RAD51 foci), HR reporter assay, DNA-PKcs inhibition","journal":"Cell Death & Differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined molecular pathway (DNA-PKcs→RBX1→EXO1→HR), single lab","pmids":["31562368"],"is_preprint":false},{"year":2020,"finding":"Gossypol inhibits cullin neddylation by directly binding to the SAG-CUL5 or RBX1-CUL1 complex, blocking neddylation of both CUL5 and CUL1. CUL5-H572 plays a key role for gossypol binding. Cellular treatment with gossypol selectively causes accumulation of NOXA and MCL1, substrates of CUL5 and CUL1, respectively.","method":"AlphaScreen HTS assay, direct binding biochemistry, site-directed mutagenesis (H572), cellular substrate accumulation assay","journal":"Neoplasia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding with mutagenesis and functional cellular readout, single lab","pmids":["32145688"],"is_preprint":false},{"year":2021,"finding":"Purified recombinant CUL2-RBX1 complex expressed from E. coli assembles with substrate receptor modules (e.g., VHL-EloBC) and is enzymatically active in transferring ubiquitin and ubiquitin-like proteins to substrates in vitro, validating the reconstituted complex as functional.","method":"Recombinant protein expression and purification, in vitro ubiquitination assay","journal":"Scientific Reports","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution, single lab, single study","pmids":["34045610"],"is_preprint":false},{"year":2022,"finding":"Cryo-EM structure of CRL7FBXW8 reveals that the RBX1 RING domain is constrained in an orientation incompatible with binding E2~NEDD8 or E2~ubiquitin intermediates, explaining why purified CRL7FBXW8 lacks auto-neddylation and ubiquitination activities. Instead, CRL7 acts as a substrate receptor linked via SKP1-FBXW8 to a neddylated CUL1-RBX1 catalytic module for ubiquitination.","method":"Cryo-EM structure determination, in vitro neddylation and ubiquitination assays","journal":"Nature Structural & Molecular Biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure plus in vitro activity assays demonstrating unique RBX1 pose and CRL-CRL partnership","pmids":["35982156"],"is_preprint":false},{"year":2022,"finding":"Treg cell-specific deletion of Rbx1 in mice causes early-onset fatal inflammatory disorder with disrupted Treg homeostasis and suppressive functions. Rbx1 is required for maintenance of effector Treg subpopulation and regulates inflammatory pathways. Similar but less severe phenotypes occur with Ube2m deletion; deletion of Rbx2/Sag or Ube2f yields no obvious phenotype, establishing the Ube2m-Rbx1 axis as specifically required for Treg fitness.","method":"Conditional knockout mouse model, flow cytometry, transcriptomics, genetic epistasis","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with genetic epistasis across multiple neddylation complex members, well-defined in vivo phenotype","pmids":["35641500"],"is_preprint":false},{"year":2023,"finding":"RBX1 interacts with and ubiquitinates p27 (phospho-Thr187), promoting its degradation in multiple myeloma cells. RBX1 overexpression induces G1-S cell cycle entry; RBX1 knockdown causes p27 accumulation and growth arrest. RBX1 knockdown inhibited myeloma development in SCID-Hu and xenotransplant mouse models.","method":"Co-immunoprecipitation, ubiquitination assay, cell cycle analysis, in vivo xenograft","journal":"Cancer Biology & Therapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ubiquitination assay and in vivo model, single lab","pmids":["37639640"],"is_preprint":false},{"year":2023,"finding":"RBX1 promotes PKM alternative splicing toward PKM2 in anaplastic thyroid carcinoma by ubiquitinating and degrading the SMAR1 transcription factor via the proteasome pathway. This destroys the SMAR1/HDAC6 complex, facilitating PKM2-mediated Warburg effect and ATC metastasis.","method":"Ubiquitination assay, co-immunoprecipitation, siRNA knockdown, splicing analysis","journal":"Cell & Bioscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitination assay with substrate identification and functional splicing readout, single lab","pmids":["36810109"],"is_preprint":false},{"year":2024,"finding":"The CUL3-RBX1-KLHL9 E3 ligase complex translocates to the lysosome in response to amino acid stimulation and ubiquitinates Rheb there, enhancing its interaction with mTORC1 for activation. KLHL9 is the essential adaptor bridging CUL3-RBX1 to Rheb. Deletion of CUL3, RBX1, or KLHL9 diminishes Rheb ubiquitination and reduces amino acid-induced mTORC1 activation without affecting lysosomal mTORC1 localization.","method":"Genetic knockout, co-immunoprecipitation, ubiquitination assay, subcellular fractionation, mTORC1 activity assay","journal":"Cell Reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO of multiple complex members with consistent substrate and signaling readout, single lab with multiple orthogonal methods","pmids":["39708321"],"is_preprint":false},{"year":2024,"finding":"Cryo-EM structure of SCFFBXO3 (CUL1-RBX1-SKP1-FBXO3) at 3.70 Å resolution shows that unmodified SCFFBXO3 adopts a closed conformation where the RBX1 globular region is near the FBXO3 ApaG domain, suggesting CUL1 neddylation is required to achieve high E3 activity.","method":"Cryo-EM structure determination","journal":"Biochemical and Biophysical Research Communications","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — cryo-EM structure of novel SCF complex, single study, functional implication inferred from structural model","pmids":["39406020"],"is_preprint":false},{"year":2025,"finding":"RBX1 loss in thymus causes shrinkage, delayed T cell development, increased γδ T cells, and altered γδ T1/T17 balance. Mechanistically, Rbx1 loss alters Akt, NF-κB, and metabolic pathways in progenitor γδ T/DN3a cells. Some phenotypes are partially rescued by simultaneous Bim deletion. Rbx2/Sag deletion has no obvious thymic phenotype, establishing Rbx1 specificity.","method":"Conditional knockout mouse model, flow cytometry, genetic epistasis (Bim co-deletion), transcriptomic pathway analysis","journal":"Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with genetic epistasis and pathway analysis, single lab, single study","pmids":["40642056"],"is_preprint":false},{"year":2025,"finding":"Cryo-EM structures of CSN-CRL1 (SCF) complexes in multiple functional states reveal that during the catalytic intermediate of deneddylation, the RBX1 RING domain is repositioned along with the CSN5 Ins-1 loop and neddylated Cullin WHB domain for isopeptide bond cleavage. Four dissociation intermediates reveal stepwise CSN release, with RBX1 RING playing a central role in stabilizing key interactions throughout the deneddylation cycle.","method":"Cryo-EM structure determination of multiple states","journal":"bioRxiv","confidence":"High","confidence_rationale":"Tier 1 / Moderate — cryo-EM structures of multiple functional states providing detailed mechanistic model, preprint, single lab","pmids":[],"is_preprint":true},{"year":2025,"finding":"RBX1 ubiquitinates NCOA4, modulating its expression and thereby inhibiting NCOA4-mediated ferritinophagy (selective autophagy for ferritin degradation) in nucleus pulposus stem cells. Inhibition of RBX1 promotes ferroptosis through enhanced NCOA4-mediated ferritinophagy. RBX1 overexpression in vivo ameliorates ferroptosis and intervertebral disc degeneration.","method":"Ubiquitination assay, siRNA knockdown, overexpression, in vivo animal model","journal":"Journal of Translational Medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitination assay with functional in vivo validation, single lab","pmids":["40335979"],"is_preprint":false},{"year":2025,"finding":"RBX1 mediates ubiquitination and degradation of TXNIP; METTL3 enhances RBX1 mRNA stability through m6A modification, increasing RBX1 protein levels, which then ubiquitinates TXNIP and reduces its expression, initiating ferroptosis that ameliorates liver fibrosis.","method":"Western blot, siRNA/overexpression, ubiquitination assay, in vivo liver fibrosis models (CCl4 and bile duct ligation)","journal":"Hepatology Communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitination assay with in vivo validation, single lab, single study","pmids":["40658786"],"is_preprint":false},{"year":2025,"finding":"RBX1 promotes ubiquitination and proteasomal degradation of FoxO1 transcription factor, thereby suppressing FoxO1-driven c-Myc expression and c-Myc-mediated glutamine metabolism. Reduced RBX1 in cardiac hypertrophy models correlates with increased FoxO1 protein and enhanced glutamine metabolism; RBX1 overexpression reverses cardiomyocyte hypertrophy.","method":"Co-immunoprecipitation, ubiquitination assay, Western blot, siRNA/overexpression","journal":"International Immunopharmacology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single method (Co-IP/ubiquitination), limited functional orthogonal validation","pmids":["41999689"],"is_preprint":false},{"year":2003,"finding":"In C. elegans, RBX1 depletion by RNAi causes defects in meiotic division, mitotic chromosomal condensation/segregation, cytokinesis, and reduced histone H3 phosphorylation at Ser10/Ser28. The histone H3 phosphorylation defect is rescued by simultaneous depletion of protein phosphatase 1 (GLC7α/β), linking RBX1 to chromosome metabolism via H3 phosphorylation regulation.","method":"RNAi knockdown in C. elegans, epistasis with PP1 RNAi, immunofluorescence","journal":"Genes to Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi in vivo plus genetic epistasis with PP1, single study","pmids":["14622138"],"is_preprint":false},{"year":2021,"finding":"In zebrafish, Rbx1 loss-of-function mutants exhibit cardiomyocyte multi-layering (excess trabeculation). Endothelial-specific (but not myocardial-specific) rbx1 overexpression normalizes cardiac wall morphogenesis, indicating endocardial Rbx1 activity is required for this process. The phenotype requires blood flow/cardiac contractility and is Notch-pathway associated; pharmacological Hedgehog activation ameliorates the phenotype.","method":"Zebrafish genetic mutant, tissue-specific transgenic overexpression, Hedgehog pharmacological activation, Notch reporter assay","journal":"Developmental Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KO with tissue-specific genetic rescue, single lab","pmids":["34363825"],"is_preprint":false},{"year":2015,"finding":"Cancer-testis antigen MAGE-C2 binds directly to the RING domain of Rbx1 and participates in the SCF complex, inhibiting its E3 ubiquitin ligase activity. MAGE-C2 ablation decreases cyclin E levels by accelerating ubiquitin-mediated proteasome degradation; overexpression of MAGE-C2 increases cyclin E and promotes G1-S transition.","method":"Co-immunoprecipitation, in vitro binding, ubiquitination assay, siRNA/overexpression","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding plus functional ubiquitination assay and substrate readout, single lab","pmids":["26540345"],"is_preprint":false},{"year":2014,"finding":"The CUL4A-DDB1-Rbx1 E3 ligase complex (CRL4A) mediates ubiquitin-dependent proteasomal degradation of dysfunctional PEX7 (the PTS2 peroxisome import receptor, including RCDP patient mutants), serving as a quality control E3 for Pex7p. Degradation of dysfunctional Pex7p is essential for maintaining normal PTS2 import.","method":"Co-immunoprecipitation, ubiquitination assay, proteasome inhibitor, siRNA knockdown, PTS2 import assay","journal":"Biochemical Journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple methods (Co-IP, ubiquitination, functional import assay), single lab","pmids":["24989250"],"is_preprint":false},{"year":2015,"finding":"Both Rbx1 and Rbx2 can activate Cul5-Vif E3 ubiquitin ligase to promote APOBEC3G (A3G) ubiquitination in vitro. However, in cells, only reduction of endogenous Rbx2 (not Rbx1) impairs Vif-induced A3G degradation. Rbx2 dose-dependently inhibits the interaction of Rbx1 with Cul5, suggesting competitive assembly.","method":"In vitro ubiquitination assay, Co-immunoprecipitation in cells, siRNA knockdown","journal":"Biochemical and Biophysical Research Communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and cellular assays with clear distinction between in vitro and in vivo activity, single lab","pmids":["25912140"],"is_preprint":false}],"current_model":"RBX1 is an evolutionarily conserved RING-H2 finger protein that serves as the catalytic RING subunit of Cullin-RING E3 ubiquitin ligases (CRLs), including SCF (CUL1), CRL2 (CUL2), CRL3 (CUL3), and CRL4 (CUL4) complexes; it binds Cullins via an intermolecular beta-sheet to form the E2-recruiting catalytic core, also functions as an E3 for NEDD8/Rub1 conjugation (neddylation) to Cullins, is allosterically regulated by conformational changes upon neddylation and by inhibitory binding of Glomulin to its RING domain, is stabilized by USP15-mediated deubiquitination and subject to caspase-dependent N-terminal cleavage, and controls diverse cellular processes—including cell cycle progression (via p27/EXO1/CDT1 degradation), Nrf2 antioxidant signaling, Treg cell homeostasis, thymus development, cardiac morphogenesis, and mTORC1 activation (via Rheb ubiquitination)—by directing timely proteasomal degradation of specific substrates."},"narrative":{"mechanistic_narrative":"RBX1 is an evolutionarily conserved RING-H2 finger protein that serves as the catalytic RING subunit of Cullin-RING E3 ubiquitin ligases (CRLs), directing the timely proteasomal degradation of specific substrates across diverse cellular processes [PMID:10213691, PMID:10213692]. Structurally, RBX1 docks onto the globular domain of a Cullin through an intermolecular beta-sheet, forming a two-subunit catalytic core that recruits the E2 ubiquitin-conjugating enzyme, while the Cullin acts as a rigid scaffold positioning the substrate-recognition module >100 Å away [PMID:11961546]. This architecture is shared across CRL families, with substrate-adaptor sequences (Cul2-box vs. Cul5-box) and Cullin interface hotspots dictating selective assembly of RBX1 with CUL1 (SCF), CUL2 (e.g. VHL–EloBC), CUL3, and CUL4 complexes [PMID:15601820, PMID:28591624, PMID:24989250]. Beyond ubiquitin transfer, RBX1 functions as the E3 for conjugation of the ubiquitin-like protein NEDD8/Rub1 onto Cullins, an activity dependent on its atypical RING residue D97 and required to activate CRL ubiquitination [PMID:10579999, PMID:15966899]. RBX1 RING-domain repositioning underlies the conformational logic of CRL catalysis: it is constrained or released in distinct neddylation, ubiquitination, and CSN-mediated deneddylation states [PMID:35982156], and its activity is competitively inhibited by direct binding of Glomulin (GLMN) to the E2-interacting RING surface [PMID:22748924, PMID:22405651]. Through these CRL complexes RBX1 controls cell-cycle progression by driving degradation of p27, CDT1/ORC1, and EXO1 [PMID:19325126, PMID:21115485, PMID:31562368], Nrf2 antioxidant signaling via the Cul3–Keap1 axis [PMID:19279002, PMID:20452971], regulatory T-cell and thymus development via the UBE2M–RBX1 neddylation axis [PMID:35641500, PMID:40642056], cardiac morphogenesis [PMID:34363825], and mTORC1 activation through CUL3–KLHL9-mediated Rheb ubiquitination [PMID:39708321]. RBX1 protein levels are themselves controlled by USP15-mediated deubiquitination [PMID:16005295] and caspase-dependent N-terminal cleavage under ER stress [PMID:22822056].","teleology":[{"year":1999,"claim":"Established RBX1 as a shared catalytic component of both ubiquitin and NEDD8/Rub1 conjugation machineries, defining it as more than a passive structural subunit.","evidence":"Co-IP from rat liver and yeast genetics placing RBX1 in VHL-Cul2 and SCF complexes, plus in vitro reconstitution of cyclin and Rub1 conjugation with purified Rbx1/Cdc34/Ubc12","pmids":["10213691","10213692","10579999"],"confidence":"High","gaps":["Did not resolve how RBX1 physically couples E2 recruitment to catalysis","Substrate range across Cullin families not yet defined"]},{"year":2002,"claim":"Defined the structural basis of RBX1 function: it binds the Cullin globular domain through an intermolecular beta-sheet to form an E2-recruiting catalytic core held rigidly apart from the substrate receptor.","evidence":"X-ray crystallography of the Cul1-Rbx1-Skp1-Skp2 SCF complex with scaffold-rigidity mutagenesis","pmids":["11961546"],"confidence":"High","gaps":["Static structure did not capture catalytic conformational dynamics","How ubiquitin reaches the distant substrate left unexplained"]},{"year":2005,"claim":"Resolved how RBX1 catalytic specificity and stability differ across Cullins, identifying the atypical RING residue D97 as key for neddylation and revealing complex-specific stability and a deubiquitination control mechanism.","evidence":"Systematic D97 mutagenesis with in vitro neddylation/ubiquitination assays, and USP15 zinc-finger-dependent stabilization assays","pmids":["15966899","16005295"],"confidence":"Medium","gaps":["USP15 stabilization from single lab without in vivo confirmation","Physiological triggers of RBX1 auto-ubiquitination not defined"]},{"year":2009,"claim":"Demonstrated that RBX1 loss has distinct consequences in proliferation control, linking it causally to substrate accumulation through genetic rescue.","evidence":"Gene-trap mouse knockout with p27 double-knockout rescue, and siRNA in cancer cells showing G2-M arrest/apoptosis/senescence","pmids":["19325126","19509229"],"confidence":"High","gaps":["Mouse lethality at E7.5 limited analysis of later roles","Senescence pathway downstream of RBX1 loss remained p53/p16-independent and unexplained"]},{"year":2010,"claim":"Connected RBX1 to genome stability and antioxidant feedback by identifying CDT1/ORC1 as replication-licensing substrates and an Nrf2-driven autoregulatory loop on Cul3/Rbx1 transcription.","evidence":"siRNA in human cells with C. elegans RNAi epistasis (CDT-1), γH2AX readouts, and ARE promoter mutagenesis/reporter assays","pmids":["21115485","20452971"],"confidence":"High","gaps":["Nrf2 feedback evidence from a single lab","Direct CRL adaptor for CDT1 in this context not specified"]},{"year":2012,"claim":"Identified Glomulin as a direct competitive inhibitor of the RBX1 RING domain and linked RBX1 to disease and to autophagy/ER-stress regulation.","evidence":"Crystal structure of GLMN-RBX1-CUL1 with ubiquitination inhibition assays and GVM disease mutations; DEPTOR-autophagy and caspase-cleavage functional studies","pmids":["22748924","22405651","22965024","22822056"],"confidence":"High","gaps":["Regulatory cues controlling GLMN-RBX1 engagement in vivo unclear","Caspase-cleavage and DEPTOR findings from single labs"]},{"year":2017,"claim":"Captured RBX1 in a conformational trajectory within an intact pentameric CRL2 complex, advancing the dynamic model of catalysis beyond the static SCF structure.","evidence":"Crystal structure of full Cul2-Rbx1-EloBC-pVHL with ITC and selectivity-switch mutagenesis","pmids":["28591624"],"confidence":"High","gaps":["Did not resolve fully neddylated active state","E2-bound catalytic intermediate not visualized"]},{"year":2018,"claim":"Expanded the RBX1 substrate and adaptor repertoire (RhoB via KCTD10, SESN2) and showed the RING domain is a target of small-molecule and metalloid inhibition.","evidence":"Co-IP, site-specific ubiquitination mapping, endothelial barrier assays, and arsenite RING-binding/ubiquitination assays","pmids":["29358211","29294217","29658272"],"confidence":"High","gaps":["SESN2 link from single Tier 3 study","Selectivity of arsenite/RING engagement across CRLs unclear"]},{"year":2022,"claim":"Revealed that RBX1 RING orientation can be conformationally locked, explaining catalytically silent CRLs and the existence of CRL-CRL substrate-receptor partnerships, and defined the UBE2M-RBX1 neddylation axis as specifically required for Treg fitness.","evidence":"Cryo-EM of CRL7FBXW8 with in vitro activity assays; Treg-specific conditional knockout with genetic epistasis across neddylation enzymes","pmids":["35982156","35641500"],"confidence":"High","gaps":["Substrates degraded by the CRL7-CUL1 partnership not enumerated","Tissue-specific substrates underlying Treg phenotype not identified"]},{"year":2024,"claim":"Placed RBX1 in nutrient-sensing signaling by defining a lysosomal CUL3-RBX1-KLHL9 complex that ubiquitinates Rheb to promote amino-acid-induced mTORC1 activation.","evidence":"Genetic knockout of CUL3/RBX1/KLHL9 with ubiquitination, fractionation, and mTORC1 activity assays; plus cryo-EM of closed SCFFBXO3","pmids":["39708321","39406020"],"confidence":"High","gaps":["How amino acid signals trigger complex lysosomal translocation unclear","Rheb ubiquitin-chain topology not defined"]},{"year":2025,"claim":"Detailed the deneddylation cycle structurally—showing RBX1 RING repositioning during CSN-mediated NEDD8 removal—and extended RBX1 substrate control to ferroptosis and metabolic regulation across multiple disease tissues.","evidence":"Cryo-EM of CSN-CRL1 functional states (preprint); ubiquitination assays with in vivo models for NCOA4, TXNIP, and FoxO1 substrates","pmids":["40335979","40658786"],"confidence":"High","gaps":["CSN-CRL structures are preprint, single lab","Tissue-specific substrate findings (NCOA4/TXNIP/FoxO1) each from single labs"]},{"year":null,"claim":"How RBX1 substrate selection, neddylation timing, and inhibitor sensitivity are integrated to control specific physiological versus pathological outcomes across distinct Cullin complexes remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking RBX1 conformational states to substrate choice in vivo","RBX1 vs. RBX2 functional partitioning across Cullins incompletely mapped","Disease-targeted modulation of specific RBX1-CRL pairs not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[1,2,3,6]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[2,3,6,21,23]},{"term_id":"GO:0031386","term_label":"protein tag activity","supporting_discovery_ids":[3,6]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[13,14]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[9,15]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[21,31]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[19]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1,2,3]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[8,10,24,29]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[9,11,22]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[16,35]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[31]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[28,33]}],"complexes":["SCF (CUL1-RBX1)","CRL2 (CUL2-RBX1-EloBC-VHL)","CRL3 (CUL3-RBX1)","CRL4 (CUL4A-DDB1-RBX1)"],"partners":["CUL1","CUL2","CUL3","GLMN","USP15","KCTD10","KLHL9","VHL"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P62877","full_name":"E3 ubiquitin-protein ligase RBX1","aliases":["E3 ubiquitin-protein transferase RBX1","Protein ZYP","RING finger protein 75","RING-box protein 1","Rbx1","Regulator of cullins 1","ROC1"],"length_aa":108,"mass_kda":12.3,"function":"E3 ubiquitin ligase component of multiple cullin-RING-based E3 ubiquitin-protein ligase (CRLs) complexes which mediate the ubiquitination and subsequent proteasomal degradation of target proteins, including proteins involved in cell cycle progression, signal transduction, transcription and transcription-coupled nucleotide excision repair (PubMed:10230407, PubMed:10579999, PubMed:11961546, PubMed:15983046, PubMed:16678110, PubMed:19112177, PubMed:19679664, PubMed:22748924, PubMed:23455478, PubMed:27565346, PubMed:29769719, PubMed:32355176, PubMed:33417871, PubMed:37844242, PubMed:38326650, PubMed:39504960, PubMed:39667934, PubMed:38316879). CRLs complexes and ARIH1 collaborate in tandem to mediate ubiquitination of target proteins, ARIH1 mediating addition of the first ubiquitin on CRLs targets (PubMed:27565346). The functional specificity of the E3 ubiquitin-protein ligase complexes depends on the variable substrate recognition components. As a component of the CSA complex mediates ubiquitination of Pol II subunit POLR2A at 'Lys-1268', a critical TC-NER checkpoint (PubMed:32355176, PubMed:34526721). Core component of the Cul7-RING(FBXW8) ubiquitin ligase complex, which mediates the ubiquitination and subsequent proteasomal degradation of target proteins (PubMed:35982156). Core component of a Cul9-RING ubiquitin ligase complex composed of CUL9 and RBX1, which mediates mono-ubiquitination of p53/TP53 (PubMed:38605244). Recruits the E2 ubiquitin-conjugating enzyme CDC34 to the complex and brings it into close proximity to the substrate. Probably also stimulates CDC34 autoubiquitination. May be required for histone H3 and histone H4 ubiquitination in response to ultraviolet and for subsequent DNA repair. Promotes the neddylation of CUL1, CUL2, CUL4 and CUL4 via its interaction with UBE2M. Involved in the ubiquitination of KEAP1, ENC1 and KLHL41. In concert with ATF2 and CUL3, promotes degradation of KAT5 thereby attenuating its ability to acetylate and activate ATM. As part of a multisubunit complex composed of elongin BC complex (ELOB and ELOC), elongin A/ELOA, RBX1 and CUL5; polyubiquitinates monoubiquitinated POLR2A (PubMed:19920177)","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/P62877/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/RBX1","classification":"Common Essential","n_dependent_lines":1167,"n_total_lines":1208,"dependency_fraction":0.9660596026490066},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"DDB1","stoichiometry":10.0},{"gene":"CAPZB","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/RBX1","total_profiled":1310},"omim":[{"mim_id":"620087","title":"DDB1- AND CUL4-ASSOCIATED FACTOR 12; DCAF12","url":"https://www.omim.org/entry/620087"},{"mim_id":"620077","title":"PROTEIN-L-ISOASPARTATE (D-ASPARTATE) O-METHYLTRANSFERASE DOMAIN-CONTAINING PROTEIN 2; PCMTD2","url":"https://www.omim.org/entry/620077"},{"mim_id":"619763","title":"WD AND TETRATRICOPEPTIDE REPEATS PROTEIN 1; WDTC1","url":"https://www.omim.org/entry/619763"},{"mim_id":"618753","title":"LEUCINE-RICH REPEAT-CONTAINING PROTEIN 41; LRRC41","url":"https://www.omim.org/entry/618753"},{"mim_id":"618020","title":"KELCH-LIKE 22; KLHL22","url":"https://www.omim.org/entry/618020"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/RBX1"},"hgnc":{"alias_symbol":["ROC1","RNF75","BA554C12.1"],"prev_symbol":[]},"alphafold":{"accession":"P62877","domains":[{"cath_id":"3.30.40.10","chopping":"53-105","consensus_level":"high","plddt":86.6568,"start":53,"end":105}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P62877","model_url":"https://alphafold.ebi.ac.uk/files/AF-P62877-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P62877-F1-predicted_aligned_error_v6.png","plddt_mean":79.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RBX1","jax_strain_url":"https://www.jax.org/strain/search?query=RBX1"},"sequence":{"accession":"P62877","fasta_url":"https://rest.uniprot.org/uniprotkb/P62877.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P62877/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P62877"}},"corpus_meta":[{"pmid":"11961546","id":"PMC_11961546","title":"Structure of the 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Cul1 acts as a rigid scaffold holding Rbx1 and the substrate-recognition complex >100 Å apart.\",\n      \"method\": \"X-ray crystallography with functional validation via Cul1 scaffold rigidity mutations\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus mutagenesis in a landmark, widely replicated study\",\n      \"pmids\": [\"11961546\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Rbx1 is a component of the endogenous VHL tumor suppressor complex (elongin B/C–Cul2–VHL) and SCF ubiquitin ligase complexes. It contains a RING-H2 finger motif, interacts with Cullins, and its yeast homolog is a subunit and potent activator of the SCFCdc4 ubiquitin ligase required for ubiquitination of Sic1 and G1-to-S transition.\",\n      \"method\": \"Co-immunoprecipitation from rat liver, yeast genetic and biochemical studies\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, yeast epistasis, independently replicated in companion paper (PMID:10213692)\",\n      \"pmids\": [\"10213691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Rbx1 promotes association of E2 Cdc34 with Cdc53 and stimulates Cdc34 auto-ubiquitination in the context of Cdc53 or SCF complexes. Phosphorylated G1 cyclin Cln1 ubiquitination was reconstituted in vitro with SCFGrr1, Rbx1, and Cdc34, directly demonstrating Rbx1's role in E3 catalytic activity.\",\n      \"method\": \"In vitro ubiquitination reconstitution assay with purified components\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — full in vitro reconstitution with purified components, replicated in companion paper\",\n      \"pmids\": [\"10213692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"The Cdc53/Rbx1 and Cul2/Rbx1 modules activate conjugation of the ubiquitin-like protein Rub1 (NEDD8) to Cdc53 and Cul2 by the dedicated E2 Ubc12, identifying Rbx1 as a common component of both ubiquitin and Rub1 (neddylation) modification enzyme systems.\",\n      \"method\": \"In vitro neddylation assay with purified Cdc53/Rbx1 and Cul2/Rbx1 modules\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of neddylation activity, single focused study with clear biochemical readout\",\n      \"pmids\": [\"10579999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"VHL specifically interacts with endogenous Cul2-Rbx1 in mammalian cells (not Cul5-Rbx2), whereas SOCS-box proteins associate with Cul5-Rbx2. Domain-swapping analyses showed that specificity for Cul2-Rbx1 vs. Cul5-Rbx2 is determined by the Cul2-box or Cul5-box sequences of substrate adaptors. RNAi-mediated knockdown of Cul2-Rbx1 inhibited VHL-mediated degradation of HIF-2α.\",\n      \"method\": \"Co-immunoprecipitation, domain-swap mutagenesis, RNAi knockdown\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, mutagenesis, and functional RNAi knockdown with substrate readout\",\n      \"pmids\": [\"15601820\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"USP15, a deubiquitinating enzyme associated with the COP9 signalosome, stabilizes Rbx1 by reversing its poly/auto-ubiquitination. The zinc finger of USP15 is essential for this rescue; a single cysteine mutation in the zinc finger abolishes USP15's ability to stabilize Rbx1.\",\n      \"method\": \"Co-transfection, pulldown, ubiquitination assay, site-directed mutagenesis\",\n      \"journal\": \"Current Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional cotransfection plus mutagenesis, single lab\",\n      \"pmids\": [\"16005295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Mutational analysis of Rbx1's RING finger residue D97 (the atypical 8th coordination residue) showed that aspartate is superior to cysteine for cullin neddylation activity. Different D97 mutants exhibit distinct activities across 6 Cullins, and specific mutants discriminate between neddylation activity and involvement in VBC-Cul2 ubiquitylation. Rbx1 mutants also destabilize VBC-Cul2 but not SCF, indicating complex-specific stability roles.\",\n      \"method\": \"Site-directed mutagenesis, in vitro neddylation and ubiquitination assays\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — systematic mutagenesis with multiple in vitro activity assays, single lab\",\n      \"pmids\": [\"15966899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"RBX1/ROC1 silencing by siRNA in human cancer cells induces sequential G2-M arrest, apoptosis, and senescence. G2-M arrest is associated with accumulation of 14-3-3σ and loss of cyclin B1/Cdc2; apoptosis involves accumulation of Puma and reduction of Bcl-2/Mcl-1/survivin; senescence is coupled with DNA damage in p53/p21- and p16/pRb-independent manners.\",\n      \"method\": \"siRNA knockdown, cell cycle analysis, apoptosis assays, Western blot\",\n      \"journal\": \"Cancer Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with multiple defined phenotypic readouts, single lab\",\n      \"pmids\": [\"19509229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Mouse Rbx1 gene-trap disruption causes embryonic lethality at E7.5 due to proliferation failure. p27 accumulates at high levels in Rbx1-null embryos. Simultaneous loss of p27 partially rescues lethality to E9.5, demonstrating that Rbx1-dependent p27 degradation is essential for early embryonic cell proliferation.\",\n      \"method\": \"Gene-trap mouse knockout, genetic epistasis (double knockout with p27), immunostaining\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo knockout with genetic rescue (epistasis), clearly defined phenotype and substrate\",\n      \"pmids\": [\"19325126\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The INrf2/Cul3-Rbx1 complex is imported into the nucleus via prothymosin-alpha binding to the DGR region of INrf2. Inside the nucleus, the complex exchanges prothymosin-alpha for Nrf2, leading to Nrf2 ubiquitination and degradation. Cul3 and Rbx1 require INrf2 for nuclear import.\",\n      \"method\": \"Co-immunoprecipitation, subcellular fractionation, siRNA knockdown, co-transfection\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, fractionation, siRNA, single lab with multiple methods\",\n      \"pmids\": [\"19279002\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RBX1 silencing in human cancer cells causes accumulation of DNA replication licensing proteins CDT1 and ORC1, leading to DNA double-strand breaks, DNA damage response (DDR), G2 arrest, and aneuploidy. CHK1 activation is responsible for G2 arrest. In C. elegans, RBX-1 silencing causes CDT-1 accumulation and DDR; simultaneous CDT-1 silencing largely abrogates this DDR.\",\n      \"method\": \"siRNA knockdown, RNAi in C. elegans, DNA damage markers (γH2AX), genetic epistasis\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function in two organisms, genetic rescue in C. elegans, multiple biochemical readouts\",\n      \"pmids\": [\"21115485\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Nrf2 controls its own degradation by transcriptionally inducing Cul3 and Rbx1 gene expression via antioxidant response elements (AREs) in their promoters. Increased Cul3-Rbx1 then ubiquitinates and degrades Nrf2, forming a feedback autoregulatory loop.\",\n      \"method\": \"Promoter mutagenesis, transfection, siRNA, ARE reporter assays\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter mutagenesis plus siRNA and overexpression, single lab\",\n      \"pmids\": [\"20452971\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Molecular dynamics simulations demonstrate that the flexible linker of Rbx1 undergoes conformational changes that allow CRL neddylation and initiation of ubiquitination even before neddylation occurs, and that large NEDD8-induced CRL conformational changes are retained after deneddylation, enabling continued ubiquitin chain elongation post-deneddylation.\",\n      \"method\": \"Molecular dynamics simulation, mutational analysis of cullin acceptor lysine\",\n      \"journal\": \"Biophysical Journal\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — computational simulation only, no in vitro or in vivo validation reported\",\n      \"pmids\": [\"20682250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Crystal structure of a GLMN-RBX1-CUL1 fragment complex reveals that Glomulin (GLMN) adopts a HEAT-like repeat fold that tightly binds the E2-interacting surface of the RBX1 RING domain, competitively inhibiting E2 (CDC34) recruitment and CRL-mediated ubiquitin chain formation. Disease-associated GVM mutations disrupt the GLMN-RBX1 interface.\",\n      \"method\": \"X-ray crystallography, biochemical ubiquitination inhibition assay, mutagenesis\",\n      \"journal\": \"Molecular Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with biochemical validation and disease-mutation analysis\",\n      \"pmids\": [\"22748924\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Glomulin (Glmn) binds directly to the RING domain of Rbx1 and inhibits its E3 ubiquitin ligase activity. Loss of Glmn increases turnover of Fbw7 and consequently elevated levels of Cyclin E and c-Myc, all reversible by CRL or proteasome inhibition.\",\n      \"method\": \"Direct binding assay, genetic loss-of-function, Western blot, proteasome/CRL inhibitors\",\n      \"journal\": \"Molecular Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding demonstrated, genetic LOF with substrate readout, replicated across cells and tissues\",\n      \"pmids\": [\"22405651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Antioxidant-induced phosphorylation of INrf2 (Keap1) Tyr85 controls nuclear export of the INrf2-Cul3-Rbx1 complex. Mutation of Tyr85 blocks nuclear export of INrf2 and co-blocks Cul3-Rbx1 export, demonstrating that Cul3-Rbx1 exits the nucleus as a complex with INrf2. Newly synthesized INrf2-Cul3-Rbx1 re-imports to degrade nuclear Nrf2 post-induction.\",\n      \"method\": \"Site-directed mutagenesis, subcellular fractionation, siRNA, immunofluorescence\",\n      \"journal\": \"Journal of Cell Science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis plus siRNA with localization readout, single lab\",\n      \"pmids\": [\"22448038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RBX1 knockdown triggers autophagy through accumulation of DEPTOR, an mTOR-inhibitory CRL substrate, thereby activating the DEPTOR-mTOR axis. Blockage of autophagy upon RBX1 knockdown enhances apoptosis, showing that this autophagy is a protective/survival response.\",\n      \"method\": \"siRNA knockdown, Western blot for DEPTOR/mTOR substrates, autophagy assays\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — substrate identification combined with functional autophagy readout, single lab\",\n      \"pmids\": [\"22965024\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"ER stress induces caspase-dependent cleavage of RBX1 eight amino acids from the N-terminus during B-cell plasma cell differentiation. Yeast expressing the N-terminally cleaved human RBX1 (Δ8) are hypersensitive to ER stress and impaired in CRL-mediated ubiquitination and degradation, demonstrating that the N-terminal region is required for RBX1 function.\",\n      \"method\": \"Biochemical cleavage assay, yeast complementation, ubiquitination assay, ER stress induction\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast complementation with mutant plus in vitro ubiquitination, single lab\",\n      \"pmids\": [\"22822056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Cullin 2-RBX1 E3 ligase interacts with RhoB and promotes its ubiquitination and degradation in liver cancer cells; this requires NEDD8 conjugation (neddylation) for activation. Inhibition of the neddylation-CRL pathway causes RhoB accumulation and contributes to p21/p27 induction and apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, iTRAQ quantitative proteomics, siRNA knockdown, ubiquitination assay\",\n      \"journal\": \"Molecular & Cellular Proteomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus quantitative proteomics and functional ubiquitination assay, single lab\",\n      \"pmids\": [\"25540389\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Rotavirus NSP1 hijacks the host Cullin-3-Rbx1 CRL complex to mediate strain-specific β-TrCP degradation. NSP1 localizes to the Golgi with the Cul3-Rbx1 complex, which targets β-TrCP and NSP1 for co-destruction at the proteasome. siRNA silencing or chemical inhibition of Cul3 or Rbx1 impairs this β-TrCP degradation.\",\n      \"method\": \"Tandem-affinity purification/MS, siRNA knockdown, chemical inhibition, co-localization imaging\",\n      \"journal\": \"PLoS Pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — AP-MS interaction plus siRNA functional validation, single lab\",\n      \"pmids\": [\"27706223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Crystal structure of the pentameric CRL2VHL complex (Cul2-Rbx1-EloBC-pVHL) reveals full-length Cul2 architecture and a new pose of Rbx1 in a trajectory from closed to open conformation. Hotspots at the Cul2-pVHL-EloBC interface were identified, and mutations defining selectivity switch for Cul2 vs. Cul5 recognition were characterized.\",\n      \"method\": \"X-ray crystallography, isothermal titration calorimetry, mutagenesis\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with biophysical validation and mutagenesis in a single rigorous study\",\n      \"pmids\": [\"28591624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The Cullin-3-Rbx1-KCTD10 E3 ligase complex mediates K63-linked polyubiquitination of RhoB at lysines 162 and 181 in primary endothelial cells, targeting RhoB to lysosomes and regulating endothelial barrier integrity via RhoB-mediated cell contraction.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, site-directed mutagenesis (K162/K181), siRNA knockdown, endothelial permeability assay\",\n      \"journal\": \"Journal of Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, mutagenesis identifying specific ubiquitination sites, functional barrier assay, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"29358211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Arsenite binds directly to the RING finger domain of Rbx1 in vitro and in cells, suppressing Cul3-Rbx1 E3 ubiquitin ligase activity, thereby impairing Nrf2 ubiquitination and activating the Nrf2 antioxidant signaling pathway.\",\n      \"method\": \"In vitro and cellular RING-domain binding assay, ubiquitination assay\",\n      \"journal\": \"Chemical Research in Toxicology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding to RING domain shown with functional ubiquitination readout, single lab\",\n      \"pmids\": [\"29658272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RBX1 is a novel E3 ligase for SESN2 (Sestrin 2), mediating its K48-linked ubiquitination upon prolonged mitochondrial damage in SH-SY5Y cells. Downregulation of RBX1 stabilizes SESN2 and reduces cell death, identifying a direct RBX1-SESN2 interaction.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay (K48-linkage), siRNA knockdown, overexpression\",\n      \"journal\": \"Molecular and Cellular Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP plus K48-specific ubiquitination assay, single lab, single study\",\n      \"pmids\": [\"29294217\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RBX1 expression is elevated in G1 phase cells and promotes neddylation of Cullin1, thereby driving G1 phase-specific ubiquitination and degradation of EXO1, which limits homologous recombination (HR) DNA repair in G1. Knockdown of RBX1 in G1-phase cells increases EXO1 levels, DSB end resection, and HR activity. DNA-PKcs autophosphorylation at S2056 is responsible for elevated RBX1 in G1; its inhibition decreases RBX1 and increases EXO1.\",\n      \"method\": \"siRNA knockdown, Western blot, immunofluorescence (RPA32/BrdU/RAD51 foci), HR reporter assay, DNA-PKcs inhibition\",\n      \"journal\": \"Cell Death & Differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined molecular pathway (DNA-PKcs→RBX1→EXO1→HR), single lab\",\n      \"pmids\": [\"31562368\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Gossypol inhibits cullin neddylation by directly binding to the SAG-CUL5 or RBX1-CUL1 complex, blocking neddylation of both CUL5 and CUL1. CUL5-H572 plays a key role for gossypol binding. Cellular treatment with gossypol selectively causes accumulation of NOXA and MCL1, substrates of CUL5 and CUL1, respectively.\",\n      \"method\": \"AlphaScreen HTS assay, direct binding biochemistry, site-directed mutagenesis (H572), cellular substrate accumulation assay\",\n      \"journal\": \"Neoplasia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding with mutagenesis and functional cellular readout, single lab\",\n      \"pmids\": [\"32145688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Purified recombinant CUL2-RBX1 complex expressed from E. coli assembles with substrate receptor modules (e.g., VHL-EloBC) and is enzymatically active in transferring ubiquitin and ubiquitin-like proteins to substrates in vitro, validating the reconstituted complex as functional.\",\n      \"method\": \"Recombinant protein expression and purification, in vitro ubiquitination assay\",\n      \"journal\": \"Scientific Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution, single lab, single study\",\n      \"pmids\": [\"34045610\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cryo-EM structure of CRL7FBXW8 reveals that the RBX1 RING domain is constrained in an orientation incompatible with binding E2~NEDD8 or E2~ubiquitin intermediates, explaining why purified CRL7FBXW8 lacks auto-neddylation and ubiquitination activities. Instead, CRL7 acts as a substrate receptor linked via SKP1-FBXW8 to a neddylated CUL1-RBX1 catalytic module for ubiquitination.\",\n      \"method\": \"Cryo-EM structure determination, in vitro neddylation and ubiquitination assays\",\n      \"journal\": \"Nature Structural & Molecular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure plus in vitro activity assays demonstrating unique RBX1 pose and CRL-CRL partnership\",\n      \"pmids\": [\"35982156\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Treg cell-specific deletion of Rbx1 in mice causes early-onset fatal inflammatory disorder with disrupted Treg homeostasis and suppressive functions. Rbx1 is required for maintenance of effector Treg subpopulation and regulates inflammatory pathways. Similar but less severe phenotypes occur with Ube2m deletion; deletion of Rbx2/Sag or Ube2f yields no obvious phenotype, establishing the Ube2m-Rbx1 axis as specifically required for Treg fitness.\",\n      \"method\": \"Conditional knockout mouse model, flow cytometry, transcriptomics, genetic epistasis\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with genetic epistasis across multiple neddylation complex members, well-defined in vivo phenotype\",\n      \"pmids\": [\"35641500\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"RBX1 interacts with and ubiquitinates p27 (phospho-Thr187), promoting its degradation in multiple myeloma cells. RBX1 overexpression induces G1-S cell cycle entry; RBX1 knockdown causes p27 accumulation and growth arrest. RBX1 knockdown inhibited myeloma development in SCID-Hu and xenotransplant mouse models.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, cell cycle analysis, in vivo xenograft\",\n      \"journal\": \"Cancer Biology & Therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ubiquitination assay and in vivo model, single lab\",\n      \"pmids\": [\"37639640\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"RBX1 promotes PKM alternative splicing toward PKM2 in anaplastic thyroid carcinoma by ubiquitinating and degrading the SMAR1 transcription factor via the proteasome pathway. This destroys the SMAR1/HDAC6 complex, facilitating PKM2-mediated Warburg effect and ATC metastasis.\",\n      \"method\": \"Ubiquitination assay, co-immunoprecipitation, siRNA knockdown, splicing analysis\",\n      \"journal\": \"Cell & Bioscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitination assay with substrate identification and functional splicing readout, single lab\",\n      \"pmids\": [\"36810109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The CUL3-RBX1-KLHL9 E3 ligase complex translocates to the lysosome in response to amino acid stimulation and ubiquitinates Rheb there, enhancing its interaction with mTORC1 for activation. KLHL9 is the essential adaptor bridging CUL3-RBX1 to Rheb. Deletion of CUL3, RBX1, or KLHL9 diminishes Rheb ubiquitination and reduces amino acid-induced mTORC1 activation without affecting lysosomal mTORC1 localization.\",\n      \"method\": \"Genetic knockout, co-immunoprecipitation, ubiquitination assay, subcellular fractionation, mTORC1 activity assay\",\n      \"journal\": \"Cell Reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO of multiple complex members with consistent substrate and signaling readout, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"39708321\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Cryo-EM structure of SCFFBXO3 (CUL1-RBX1-SKP1-FBXO3) at 3.70 Å resolution shows that unmodified SCFFBXO3 adopts a closed conformation where the RBX1 globular region is near the FBXO3 ApaG domain, suggesting CUL1 neddylation is required to achieve high E3 activity.\",\n      \"method\": \"Cryo-EM structure determination\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — cryo-EM structure of novel SCF complex, single study, functional implication inferred from structural model\",\n      \"pmids\": [\"39406020\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RBX1 loss in thymus causes shrinkage, delayed T cell development, increased γδ T cells, and altered γδ T1/T17 balance. Mechanistically, Rbx1 loss alters Akt, NF-κB, and metabolic pathways in progenitor γδ T/DN3a cells. Some phenotypes are partially rescued by simultaneous Bim deletion. Rbx2/Sag deletion has no obvious thymic phenotype, establishing Rbx1 specificity.\",\n      \"method\": \"Conditional knockout mouse model, flow cytometry, genetic epistasis (Bim co-deletion), transcriptomic pathway analysis\",\n      \"journal\": \"Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with genetic epistasis and pathway analysis, single lab, single study\",\n      \"pmids\": [\"40642056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Cryo-EM structures of CSN-CRL1 (SCF) complexes in multiple functional states reveal that during the catalytic intermediate of deneddylation, the RBX1 RING domain is repositioned along with the CSN5 Ins-1 loop and neddylated Cullin WHB domain for isopeptide bond cleavage. Four dissociation intermediates reveal stepwise CSN release, with RBX1 RING playing a central role in stabilizing key interactions throughout the deneddylation cycle.\",\n      \"method\": \"Cryo-EM structure determination of multiple states\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — cryo-EM structures of multiple functional states providing detailed mechanistic model, preprint, single lab\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RBX1 ubiquitinates NCOA4, modulating its expression and thereby inhibiting NCOA4-mediated ferritinophagy (selective autophagy for ferritin degradation) in nucleus pulposus stem cells. Inhibition of RBX1 promotes ferroptosis through enhanced NCOA4-mediated ferritinophagy. RBX1 overexpression in vivo ameliorates ferroptosis and intervertebral disc degeneration.\",\n      \"method\": \"Ubiquitination assay, siRNA knockdown, overexpression, in vivo animal model\",\n      \"journal\": \"Journal of Translational Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitination assay with functional in vivo validation, single lab\",\n      \"pmids\": [\"40335979\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RBX1 mediates ubiquitination and degradation of TXNIP; METTL3 enhances RBX1 mRNA stability through m6A modification, increasing RBX1 protein levels, which then ubiquitinates TXNIP and reduces its expression, initiating ferroptosis that ameliorates liver fibrosis.\",\n      \"method\": \"Western blot, siRNA/overexpression, ubiquitination assay, in vivo liver fibrosis models (CCl4 and bile duct ligation)\",\n      \"journal\": \"Hepatology Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitination assay with in vivo validation, single lab, single study\",\n      \"pmids\": [\"40658786\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RBX1 promotes ubiquitination and proteasomal degradation of FoxO1 transcription factor, thereby suppressing FoxO1-driven c-Myc expression and c-Myc-mediated glutamine metabolism. Reduced RBX1 in cardiac hypertrophy models correlates with increased FoxO1 protein and enhanced glutamine metabolism; RBX1 overexpression reverses cardiomyocyte hypertrophy.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, Western blot, siRNA/overexpression\",\n      \"journal\": \"International Immunopharmacology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single method (Co-IP/ubiquitination), limited functional orthogonal validation\",\n      \"pmids\": [\"41999689\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"In C. elegans, RBX1 depletion by RNAi causes defects in meiotic division, mitotic chromosomal condensation/segregation, cytokinesis, and reduced histone H3 phosphorylation at Ser10/Ser28. The histone H3 phosphorylation defect is rescued by simultaneous depletion of protein phosphatase 1 (GLC7α/β), linking RBX1 to chromosome metabolism via H3 phosphorylation regulation.\",\n      \"method\": \"RNAi knockdown in C. elegans, epistasis with PP1 RNAi, immunofluorescence\",\n      \"journal\": \"Genes to Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi in vivo plus genetic epistasis with PP1, single study\",\n      \"pmids\": [\"14622138\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In zebrafish, Rbx1 loss-of-function mutants exhibit cardiomyocyte multi-layering (excess trabeculation). Endothelial-specific (but not myocardial-specific) rbx1 overexpression normalizes cardiac wall morphogenesis, indicating endocardial Rbx1 activity is required for this process. The phenotype requires blood flow/cardiac contractility and is Notch-pathway associated; pharmacological Hedgehog activation ameliorates the phenotype.\",\n      \"method\": \"Zebrafish genetic mutant, tissue-specific transgenic overexpression, Hedgehog pharmacological activation, Notch reporter assay\",\n      \"journal\": \"Developmental Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO with tissue-specific genetic rescue, single lab\",\n      \"pmids\": [\"34363825\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Cancer-testis antigen MAGE-C2 binds directly to the RING domain of Rbx1 and participates in the SCF complex, inhibiting its E3 ubiquitin ligase activity. MAGE-C2 ablation decreases cyclin E levels by accelerating ubiquitin-mediated proteasome degradation; overexpression of MAGE-C2 increases cyclin E and promotes G1-S transition.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding, ubiquitination assay, siRNA/overexpression\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding plus functional ubiquitination assay and substrate readout, single lab\",\n      \"pmids\": [\"26540345\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The CUL4A-DDB1-Rbx1 E3 ligase complex (CRL4A) mediates ubiquitin-dependent proteasomal degradation of dysfunctional PEX7 (the PTS2 peroxisome import receptor, including RCDP patient mutants), serving as a quality control E3 for Pex7p. Degradation of dysfunctional Pex7p is essential for maintaining normal PTS2 import.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, proteasome inhibitor, siRNA knockdown, PTS2 import assay\",\n      \"journal\": \"Biochemical Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple methods (Co-IP, ubiquitination, functional import assay), single lab\",\n      \"pmids\": [\"24989250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Both Rbx1 and Rbx2 can activate Cul5-Vif E3 ubiquitin ligase to promote APOBEC3G (A3G) ubiquitination in vitro. However, in cells, only reduction of endogenous Rbx2 (not Rbx1) impairs Vif-induced A3G degradation. Rbx2 dose-dependently inhibits the interaction of Rbx1 with Cul5, suggesting competitive assembly.\",\n      \"method\": \"In vitro ubiquitination assay, Co-immunoprecipitation in cells, siRNA knockdown\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and cellular assays with clear distinction between in vitro and in vivo activity, single lab\",\n      \"pmids\": [\"25912140\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RBX1 is an evolutionarily conserved RING-H2 finger protein that serves as the catalytic RING subunit of Cullin-RING E3 ubiquitin ligases (CRLs), including SCF (CUL1), CRL2 (CUL2), CRL3 (CUL3), and CRL4 (CUL4) complexes; it binds Cullins via an intermolecular beta-sheet to form the E2-recruiting catalytic core, also functions as an E3 for NEDD8/Rub1 conjugation (neddylation) to Cullins, is allosterically regulated by conformational changes upon neddylation and by inhibitory binding of Glomulin to its RING domain, is stabilized by USP15-mediated deubiquitination and subject to caspase-dependent N-terminal cleavage, and controls diverse cellular processes—including cell cycle progression (via p27/EXO1/CDT1 degradation), Nrf2 antioxidant signaling, Treg cell homeostasis, thymus development, cardiac morphogenesis, and mTORC1 activation (via Rheb ubiquitination)—by directing timely proteasomal degradation of specific substrates.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RBX1 is an evolutionarily conserved RING-H2 finger protein that serves as the catalytic RING subunit of Cullin-RING E3 ubiquitin ligases (CRLs), directing the timely proteasomal degradation of specific substrates across diverse cellular processes [#1, #2]. Structurally, RBX1 docks onto the globular domain of a Cullin through an intermolecular beta-sheet, forming a two-subunit catalytic core that recruits the E2 ubiquitin-conjugating enzyme, while the Cullin acts as a rigid scaffold positioning the substrate-recognition module >100 Å away [#0]. This architecture is shared across CRL families, with substrate-adaptor sequences (Cul2-box vs. Cul5-box) and Cullin interface hotspots dictating selective assembly of RBX1 with CUL1 (SCF), CUL2 (e.g. VHL–EloBC), CUL3, and CUL4 complexes [#4, #20, #41]. Beyond ubiquitin transfer, RBX1 functions as the E3 for conjugation of the ubiquitin-like protein NEDD8/Rub1 onto Cullins, an activity dependent on its atypical RING residue D97 and required to activate CRL ubiquitination [#3, #6]. RBX1 RING-domain repositioning underlies the conformational logic of CRL catalysis: it is constrained or released in distinct neddylation, ubiquitination, and CSN-mediated deneddylation states [#27, #34], and its activity is competitively inhibited by direct binding of Glomulin (GLMN) to the E2-interacting RING surface [#13, #14]. Through these CRL complexes RBX1 controls cell-cycle progression by driving degradation of p27, CDT1/ORC1, and EXO1 [#8, #10, #24], Nrf2 antioxidant signaling via the Cul3–Keap1 axis [#9, #11], regulatory T-cell and thymus development via the UBE2M–RBX1 neddylation axis [#28, #33], cardiac morphogenesis [#39], and mTORC1 activation through CUL3–KLHL9-mediated Rheb ubiquitination [#31]. RBX1 protein levels are themselves controlled by USP15-mediated deubiquitination [#5] and caspase-dependent N-terminal cleavage under ER stress [#17].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established RBX1 as a shared catalytic component of both ubiquitin and NEDD8/Rub1 conjugation machineries, defining it as more than a passive structural subunit.\",\n      \"evidence\": \"Co-IP from rat liver and yeast genetics placing RBX1 in VHL-Cul2 and SCF complexes, plus in vitro reconstitution of cyclin and Rub1 conjugation with purified Rbx1/Cdc34/Ubc12\",\n      \"pmids\": [\"10213691\", \"10213692\", \"10579999\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve how RBX1 physically couples E2 recruitment to catalysis\", \"Substrate range across Cullin families not yet defined\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Defined the structural basis of RBX1 function: it binds the Cullin globular domain through an intermolecular beta-sheet to form an E2-recruiting catalytic core held rigidly apart from the substrate receptor.\",\n      \"evidence\": \"X-ray crystallography of the Cul1-Rbx1-Skp1-Skp2 SCF complex with scaffold-rigidity mutagenesis\",\n      \"pmids\": [\"11961546\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Static structure did not capture catalytic conformational dynamics\", \"How ubiquitin reaches the distant substrate left unexplained\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Resolved how RBX1 catalytic specificity and stability differ across Cullins, identifying the atypical RING residue D97 as key for neddylation and revealing complex-specific stability and a deubiquitination control mechanism.\",\n      \"evidence\": \"Systematic D97 mutagenesis with in vitro neddylation/ubiquitination assays, and USP15 zinc-finger-dependent stabilization assays\",\n      \"pmids\": [\"15966899\", \"16005295\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"USP15 stabilization from single lab without in vivo confirmation\", \"Physiological triggers of RBX1 auto-ubiquitination not defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrated that RBX1 loss has distinct consequences in proliferation control, linking it causally to substrate accumulation through genetic rescue.\",\n      \"evidence\": \"Gene-trap mouse knockout with p27 double-knockout rescue, and siRNA in cancer cells showing G2-M arrest/apoptosis/senescence\",\n      \"pmids\": [\"19325126\", \"19509229\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mouse lethality at E7.5 limited analysis of later roles\", \"Senescence pathway downstream of RBX1 loss remained p53/p16-independent and unexplained\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Connected RBX1 to genome stability and antioxidant feedback by identifying CDT1/ORC1 as replication-licensing substrates and an Nrf2-driven autoregulatory loop on Cul3/Rbx1 transcription.\",\n      \"evidence\": \"siRNA in human cells with C. elegans RNAi epistasis (CDT-1), γH2AX readouts, and ARE promoter mutagenesis/reporter assays\",\n      \"pmids\": [\"21115485\", \"20452971\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Nrf2 feedback evidence from a single lab\", \"Direct CRL adaptor for CDT1 in this context not specified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified Glomulin as a direct competitive inhibitor of the RBX1 RING domain and linked RBX1 to disease and to autophagy/ER-stress regulation.\",\n      \"evidence\": \"Crystal structure of GLMN-RBX1-CUL1 with ubiquitination inhibition assays and GVM disease mutations; DEPTOR-autophagy and caspase-cleavage functional studies\",\n      \"pmids\": [\"22748924\", \"22405651\", \"22965024\", \"22822056\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Regulatory cues controlling GLMN-RBX1 engagement in vivo unclear\", \"Caspase-cleavage and DEPTOR findings from single labs\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Captured RBX1 in a conformational trajectory within an intact pentameric CRL2 complex, advancing the dynamic model of catalysis beyond the static SCF structure.\",\n      \"evidence\": \"Crystal structure of full Cul2-Rbx1-EloBC-pVHL with ITC and selectivity-switch mutagenesis\",\n      \"pmids\": [\"28591624\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve fully neddylated active state\", \"E2-bound catalytic intermediate not visualized\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Expanded the RBX1 substrate and adaptor repertoire (RhoB via KCTD10, SESN2) and showed the RING domain is a target of small-molecule and metalloid inhibition.\",\n      \"evidence\": \"Co-IP, site-specific ubiquitination mapping, endothelial barrier assays, and arsenite RING-binding/ubiquitination assays\",\n      \"pmids\": [\"29358211\", \"29294217\", \"29658272\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"SESN2 link from single Tier 3 study\", \"Selectivity of arsenite/RING engagement across CRLs unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Revealed that RBX1 RING orientation can be conformationally locked, explaining catalytically silent CRLs and the existence of CRL-CRL substrate-receptor partnerships, and defined the UBE2M-RBX1 neddylation axis as specifically required for Treg fitness.\",\n      \"evidence\": \"Cryo-EM of CRL7FBXW8 with in vitro activity assays; Treg-specific conditional knockout with genetic epistasis across neddylation enzymes\",\n      \"pmids\": [\"35982156\", \"35641500\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Substrates degraded by the CRL7-CUL1 partnership not enumerated\", \"Tissue-specific substrates underlying Treg phenotype not identified\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Placed RBX1 in nutrient-sensing signaling by defining a lysosomal CUL3-RBX1-KLHL9 complex that ubiquitinates Rheb to promote amino-acid-induced mTORC1 activation.\",\n      \"evidence\": \"Genetic knockout of CUL3/RBX1/KLHL9 with ubiquitination, fractionation, and mTORC1 activity assays; plus cryo-EM of closed SCFFBXO3\",\n      \"pmids\": [\"39708321\", \"39406020\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How amino acid signals trigger complex lysosomal translocation unclear\", \"Rheb ubiquitin-chain topology not defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Detailed the deneddylation cycle structurally—showing RBX1 RING repositioning during CSN-mediated NEDD8 removal—and extended RBX1 substrate control to ferroptosis and metabolic regulation across multiple disease tissues.\",\n      \"evidence\": \"Cryo-EM of CSN-CRL1 functional states (preprint); ubiquitination assays with in vivo models for NCOA4, TXNIP, and FoxO1 substrates\",\n      \"pmids\": [\"40335979\", \"40658786\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"CSN-CRL structures are preprint, single lab\", \"Tissue-specific substrate findings (NCOA4/TXNIP/FoxO1) each from single labs\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How RBX1 substrate selection, neddylation timing, and inhibitor sensitivity are integrated to control specific physiological versus pathological outcomes across distinct Cullin complexes remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking RBX1 conformational states to substrate choice in vivo\", \"RBX1 vs. RBX2 functional partitioning across Cullins incompletely mapped\", \"Disease-targeted modulation of specific RBX1-CRL pairs not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [1, 2, 3, 6]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [2, 3, 6, 21, 23]},\n      {\"term_id\": \"GO:0031386\", \"supporting_discovery_ids\": [3, 6]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [13, 14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [9, 15]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [21, 31]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [19]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 2, 3]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [8, 10, 24, 29]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [9, 11, 22]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [16, 35]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [31]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [28, 33]}\n    ],\n    \"complexes\": [\"SCF (CUL1-RBX1)\", \"CRL2 (CUL2-RBX1-EloBC-VHL)\", \"CRL3 (CUL3-RBX1)\", \"CRL4 (CUL4A-DDB1-RBX1)\"],\n    \"partners\": [\"CUL1\", \"CUL2\", \"CUL3\", \"GLMN\", \"USP15\", \"KCTD10\", \"KLHL9\", \"VHL\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}