{"gene":"RNF2","run_date":"2026-06-10T06:43:37","timeline":{"discoveries":[{"year":2006,"finding":"The RING domain of Ring1B is the catalytic E3 ubiquitin ligase subunit for histone H2A monoubiquitination; Bmi1 enhances this activity in vitro. Crystal structure of the Ring1B/Bmi1 RING-RING heterodimer reveals that Ring1B's N-terminal arm embraces the Bmi1 RING domain, and mutation of the critical E2/E3 interface residue in Ring1B abolishes activity while the equivalent Bmi1 mutation does not, demonstrating catalytic activity resides in Ring1B.","method":"In vitro ubiquitination assay, active-site mutagenesis, crystal structure of Ring1B/Bmi1 RING-RING heterodimer","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus in vitro reconstitution plus mutagenesis; independently replicated in companion JBC paper (PMID:16714294)","pmids":["16710298","16714294"],"is_preprint":false},{"year":2006,"finding":"A 2.5-Å crystal structure of the Bmi1-Ring1B core domain complex shows Ring1B 'hugs' Bmi1 through extensive RING domain contacts and an N-terminal tail that wraps around Bmi1; both contact regions synergistically enhance E3 ligase activity toward nucleosomal H2A by stabilizing the E2 enzyme-substrate interaction.","method":"Crystal structure (2.5 Å), in vitro ubiquitin transfer assay, domain mapping","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution crystal structure with functional validation; corroborated by companion EMBO J paper","pmids":["16714294"],"is_preprint":false},{"year":2011,"finding":"Crystal structure of the Bmi1/Ring1B RING-RING heterodimer in complex with E2 enzyme UbcH5c shows UbcH5c contacts Ring1B only; additionally, the Bmi1/Ring1B dimer binds duplex DNA through a basic surface patch unique to the heterodimer, and mutation of this surface abolishes H2A ubiquitination activity, revealing a novel nucleosome substrate-recognition mechanism.","method":"Crystal structure of Bmi1/Ring1B-UbcH5c complex, mutagenesis, in vitro ubiquitination assay, computational nucleosome docking","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus mutagenesis plus in vitro activity assay in a single study","pmids":["21772249"],"is_preprint":false},{"year":2006,"finding":"Ring1B generates atypical mixed K6-, K27-, and K48-based polyubiquitin chains through self-ubiquitination; this non-canonical self-modification is required for Ring1B's ability to monoubiquitinate histone H2A in vitro. Bmi1 has no self-ubiquitinating activity. Both Ring1B and Bmi1 are degraded by an exogenous E3 independent of their RING domains.","method":"In vitro ubiquitination assay, mass spectrometry linkage mapping, mutant ubiquitin analysis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with MS-based chain characterization and mutant ubiquitin controls in a single rigorous study","pmids":["17157253"],"is_preprint":false},{"year":2010,"finding":"E6-AP (UBE3A) ubiquitin ligase targets Ring1B for K48-linked polyubiquitination and proteasomal degradation; both Ring1B self-ubiquitination and E6-AP-mediated ubiquitination target the same lysine residues, creating mutually exclusive modifications that dictate activation versus degradation. E6-AP knockout mice display elevated Ring1B and ubiquitinated H2A levels with repressed HoxB9 expression in vivo.","method":"In vitro ubiquitination assay, co-immunoprecipitation, E6-AP knockout mouse analysis, immunoblot","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal biochemical assays plus in vivo genetic knockout with defined molecular readouts; replicated conceptually from prior PMID:17157253","pmids":["20351251"],"is_preprint":false},{"year":2010,"finding":"USP7 deubiquitinase interacts with Ring1B (via its RING domain) and directly deubiquitinates Ring1B both in vitro and in vivo, stabilizing Ring1B without discriminating between its activating and proteolysis-targeting polyubiquitin chain forms. USP7 is also found in a complex with other Polycomb proteins.","method":"Co-immunoprecipitation, in vitro deubiquitination assay, in vivo ubiquitination analysis","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus in vitro and in vivo deubiquitination assays, single lab","pmids":["20800574"],"is_preprint":false},{"year":2003,"finding":"Genetic ablation of Rnf2 (Ring1B) in mice causes gastrulation arrest and early embryonic lethality; this phenotype is partially rescued by concurrent genetic inactivation of the Cdkn2a (Ink4a/ARF) locus, placing Polycomb-mediated Cdkn2a repression downstream of Rnf2 during early development.","method":"Conventional knockout mouse, genetic epistasis (Rnf2 null × Cdkn2a null double mutant)","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean loss-of-function KO plus genetic epistasis with clear developmental phenotype readout","pmids":["12589020"],"is_preprint":false},{"year":2004,"finding":"Ring1B localizes to the inactive X chromosome (Xi) in female trophoblast stem (TS) and differentiating embryonic stem (ES) cells, and ubiquitinated H2A at K119 co-enriches at Xi; this enrichment is transient during differentiation, implicating Ring1B-mediated H2AK119ub in initiation but not maintenance of X chromosome inactivation.","method":"Immunofluorescence, chromatin immunoprecipitation, cell fractionation in TS and ES cells","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization by IF plus ChIP, single lab","pmids":["15509584"],"is_preprint":false},{"year":2007,"finding":"Ring1B deletion in mouse ES cells causes loss of several PRC1 proteins (unanticipated function in regulating PcG protein levels), derepression of lineage genes, and establishes chromosome-wide H2AK119ub upon Xist expression; however, Xist-mediated X chromosome silencing initiation is independent of Ring1B.","method":"Conditional knockout mouse ES cells, immunoblot, immunofluorescence, gene expression analysis","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean conditional KO with multiple orthogonal readouts including protein level, chromatin mark, and transcriptional analyses","pmids":["17620408"],"is_preprint":false},{"year":2008,"finding":"In vivo, Polycomb proteins Ezh2 (PRC2) and Rnf2 (PRC1) are each independently required for genomic contraction of imprinted clusters and imprinted gene silencing, establishing that PRC1 (via Rnf2) and PRC2 perform non-redundant roles in establishing higher-order chromatin organization at imprinted loci.","method":"Conditional knockout mouse embryos (Rnf2 and Ezh2 separately), 3D-FISH for genomic contraction, RNA FISH for imprinted gene expression","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function in vivo with structural and transcriptional readouts, two proteins tested independently","pmids":["18848501"],"is_preprint":false},{"year":2007,"finding":"Proteomics of in vivo biotinylated Ring1B identifies ~50 interacting proteins in erythroid cells, including LSD1/Aof2 and Fbxl10/Jhdm1B histone demethylases, BcoR corepressor, CK2α, Skp1, and Nspc1/Pcgf1, forming a novel Ring1B-Fbxl10-BcoR complex distinct from canonical PRC1 and E2F6 complexes.","method":"Streptavidin pulldown of biotinylated Ring1B, mass spectrometry identification, co-purification of Fbxl10 complex","journal":"Molecular & cellular proteomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS-based interactome with orthogonal complex isolation, single lab","pmids":["17296600"],"is_preprint":false},{"year":2010,"finding":"The C-terminal domain of Ring1B (C-RING1B) binds both the Polycomb (Pc) cbox domain and RYBP at the same surface, with each partner forming a nearly identical intermolecular beta sheet with C-Ring1B despite having no sequence identity, suggesting PcG targeting to different chromatin locations relies on structurally diverse binding partners of C-Ring1B.","method":"Crystal structure of C-RING1B–Pc cbox complex, NMR, mutagenesis, transcription repression assays, Drosophila in vivo chromatin association","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus NMR plus mutagenesis plus in vivo functional validation in Drosophila","pmids":["20696397"],"is_preprint":false},{"year":2009,"finding":"The C-terminal domain of Ring1B adopts a ubiquitin-like fold with a conserved surface that mediates binding to Cbx proteins (PRC1 members) and homodimerization; mutational analysis confirms this conserved surface is responsible for Cbx interaction.","method":"Crystal structure of C-terminal Ring1B domain, mutational analysis, binding assays","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution crystal structure with mutagenesis validation","pmids":["19791798"],"is_preprint":false},{"year":1998,"finding":"Bmi-1 directly interacts with the RING finger protein dinG/RING1B via their RING finger domains (heterodimerization requires intact RING fingers of both proteins plus additional flanking residues); both proteins also independently interact with the Polyhomeotic protein MPh2 through non-RING domains, forming a stable heterotrimer.","method":"Yeast two-hybrid, domain mapping with RING finger mutants","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid with domain mapping; predates biochemical confirmation by later structural work","pmids":["9627119"],"is_preprint":false},{"year":2002,"finding":"Ring1B forms protein complexes containing Rae28/Mph1, M33, and Mel18 (other PcG proteins) that associate with chromosomal DNA in vivo; a hypomorphic Ring1B mouse displays posterior homeotic transformations and mild Hox gene derepression, and Ring1B overexpression in chick embryos represses Hoxb9, confirming Ring1B's role in Hox gene regulation by PcG complexes.","method":"Co-immunoprecipitation from embryo extracts, hypomorphic knockin mouse, chick embryo overexpression, RNA in situ hybridization","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus in vivo genetic and gain-of-function approaches, single lab","pmids":["12183370"],"is_preprint":false},{"year":2014,"finding":"RNF2 is recruited by WASH to ubiquitinate AMBRA1 via K48-linked chains at lysine 45, targeting AMBRA1 for proteasomal degradation and thereby downregulating autophagy; WASH deficiency impairs RNF2–AMBRA1 association and prevents AMBRA1 degradation.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, site-directed mutagenesis (K45), autophagy flux assay, RNF2 and WASH knockdown/knockout","journal":"Cell research","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro ubiquitination reconstitution, site-specific mutagenesis, co-IP, and functional autophagy readout in a single study","pmids":["24980959"],"is_preprint":false},{"year":2013,"finding":"Aurora B kinase phosphorylates histone H3S28 at active promoters in resting B cells, which inhibits Ring1B-mediated H2A ubiquitination and enhances binding and activity of the USP16 deubiquitinase at transcribed genes; conditional knockout of either Aurora B or Ring1B reduces RNA Pol II binding to promoters and decreases cell viability in quiescent lymphocytes.","method":"Conditional knockout, ChIP-seq, in vitro ubiquitination assay, kinase assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — conditional KO of both proteins, ChIP-seq, and in vitro enzymatic assays establishing mechanistic link","pmids":["24034696"],"is_preprint":false},{"year":2013,"finding":"RNF2 functions as an E3 ligase that targets p53 for proteasomal degradation; this activity requires Bmi1. RNF2 directly binds both p53 and MDM2, promotes MDM2-mediated p53 ubiquitination, and increases MDM2 stability by inhibiting its ubiquitination. RNF2 knockdown increases p53 protein levels and half-life and induces apoptosis in p53-dependent manner.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, protein half-life measurement, RNF2 knockdown/overexpression in isogenic p53+/+ and p53-/- cells","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple biochemical assays (Co-IP, in vitro ubiquitination, half-life), isogenic cell lines; single lab","pmids":["23318437"],"is_preprint":false},{"year":2013,"finding":"RNF2 (with Bmi1) acts as an E3 ligase that targets p53 for degradation specifically in germ-cell tumor lines; knockdown of RNF2 induces p53-dependent apoptosis and reduces tumor xenograft growth, while simultaneous p53 knockdown rescues these effects.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, xenograft tumor models, RNF2/p53 double knockdown","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, in vitro assay, xenograft rescue; single lab, complements PMID:23318437","pmids":["23319651"],"is_preprint":false},{"year":2017,"finding":"Nuclear RNF2 directly binds STAT1 after interferon stimulation and promotes K33-linked polyubiquitination of STAT1 at K379 (within its DNA-binding domain), causing STAT1/STAT2 dissociation from DNA and suppression of interferon-stimulated gene transcription; RNF2 deficiency enhances ISG expression and antiviral responses.","method":"High-content E3 ligase screen, co-immunoprecipitation, site-directed mutagenesis (K379R), in vitro ubiquitination assay, ChIP, RNF2 conditional knockout","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro ubiquitination, site-specific mutagenesis, Co-IP, ChIP, and genetic KO with transcriptional readouts in a single study","pmids":["29242538"],"is_preprint":false},{"year":2014,"finding":"The nucleosome acidic patch is required for RING1B/BMI1-dependent H2A ubiquitination both in vivo and in vitro; nucleosomes with mutated acidic patch are defective substrates for RING1B/BMI1 ubiquitination in vitro, and perturbation of the acidic patch in vivo by viral LANA peptide impairs H2AXub and DDR signaling.","method":"In vitro ubiquitination assay with acidic-patch mutant nucleosomes, in vivo viral LANA peptide expression, ChIP, immunofluorescence","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro reconstitution with mutant nucleosomes plus orthogonal in vivo perturbation with defined readouts","pmids":["24603765"],"is_preprint":false},{"year":2018,"finding":"RNF2/Ring1B is required to support DNA replication fork progression; its depletion causes R-loop (RNA:DNA hybrid) accumulation that impairs replication. Mdm2 overexpression rescues RNF2 depletion for fork progression (and vice versa), and this rescue requires H2A ubiquitination sites K118/K119. RNaseH overexpression or CDK9 inhibition also rescues fork progression upon RNF2 depletion.","method":"DNA fiber assay, RNF2/Mdm2 knockdown, H2A K118/K119 mutant rescue, RNaseH overexpression, S9.6 antibody R-loop detection","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal rescue experiments establishing mechanism, fiber assays plus R-loop detection, multiple labs consistent","pmids":["30413623"],"is_preprint":false},{"year":2015,"finding":"RING1B/RING1A mono-ubiquitination of H2AK119 at pericentromeric heterochromatin is required for S-phase progression; conditional inactivation of both E3 ligases causes replication fork slowing and stalling specifically at pericentromeric regions during mid-S phase, with double-strand break accumulation at chromocenters, and this is rescued by targeted H2AK119ub at pericentromeric chromatin.","method":"Conditional double knockout of RING1A/RING1B, DNA fiber assay, γH2AX immunofluorescence, targeted monoubiquitination rescue via MBD1 fusion","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean double KO, DNA fiber assay, targeted rescue experiment establishing mechanistic specificity","pmids":["26272920"],"is_preprint":false},{"year":2015,"finding":"The E3 ubiquitin ligase activity of RING1B is dispensable for early mouse embryonic development and for much of PRC1-mediated gene repression in ES cells; PRC1 and PRC2 reinforce each other's chromatin binding but key PRC1 functions extend beyond RING1B's enzymatic activity.","method":"Catalytic-dead RING1B knockin mouse, ChIP-seq, gene expression analysis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — catalytic-dead knockin mouse with ChIP-seq and transcriptomics; single lab but rigorous genetic approach","pmids":["26385961"],"is_preprint":false},{"year":2018,"finding":"The FBXL10-RNF68-RNF2 ubiquitin ligase complex (FRRUC) is rapidly and transiently recruited to DNA damage sites in a PARP1- and TIMELESS-dependent manner; FRRUC promotes H2AK119ub at damage sites, local H2A decrease, H2A.Z incorporation, DSB signaling, and homologous recombination repair. FRRUC activity is also required for subsequent recruitment of BMI1-RNF2 and MEL18-RNF2 complexes at damage sites.","method":"Live imaging, ChIP, Co-immunoprecipitation, proximity ligation, RNF2 knockout/knockdown, HR reporter assay, PARP1 inhibition","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (live imaging, ChIP, functional HR assay, genetic KO), single lab rigorous study","pmids":["29985131"],"is_preprint":false},{"year":2014,"finding":"In pancreatic cancer, Ring1B physically interacts with Snail; Snail's carboxyl zinc fingers recruit Ring1B and Ring1A to target promoters, and Ring1B mediates H2AK119ub1 at these promoters to repress transcription and enable Snail-induced cell migration. EZH2 is required for Snail-Ring1A/B recruitment to target chromatin.","method":"Co-immunoprecipitation, ChIP assay, Ring1A/B double depletion, cell migration assay","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, ChIP with H2AK119ub1 readout, functional migration assay; single lab","pmids":["24903147"],"is_preprint":false},{"year":2015,"finding":"RING1B is O-GlcNAcylated at residues T250/S251 and S278; T250/S251 O-GlcNAcylation decreases during differentiation and regulates RING1B genomic targeting—non-O-GlcNAcylated RING1B is enriched near cell-cycle genes whereas O-GlcNAcylated RING1B is enriched near neuronal genes.","method":"Point mutagenesis of O-GlcNAc sites, ChIP-sequencing, mass spectrometry identification of modification sites","journal":"Stem cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-directed mutagenesis plus ChIP-seq; single lab","pmids":["26100231"],"is_preprint":false},{"year":2009,"finding":"RNF2 is phosphorylated at Ser41 by p38 MAPK and at multiple additional serine residues by ERK1/2 (MEK1/2 pathway); mass spectrometry identified co-translational N-terminal Met excision coupled to N-acetylation of Ser2, and phospho-Ser41 as a p38 MAPK site. RNF2 phosphorylation differentially modulates transcription factor expression and histone H2B acetylation.","method":"2D electrophoresis, kinase inhibitors (SB203580, PD98059), phosphatase treatment, mass spectrometry","journal":"Proteomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS-based site identification with pharmacological kinase inhibition; single lab, functional consequence partially characterized","pmids":["19405034"],"is_preprint":false},{"year":2005,"finding":"RNF2 physically interacts with the S6' ATPase subunit of the proteasomal 19S regulatory complex; S6' contacts RNF2 via its N-terminal RING domain and RNF2 contacts S6' via its C-terminal region. RNF2-S6' interaction increases S6' ATP hydrolysis activity, suggesting RNF2 may facilitate delivery of ubiquitinated substrates to the proteasome.","method":"Co-immunoprecipitation, domain mapping, in vitro ATPase activity assay","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain mapping plus in vitro ATPase assay; single lab","pmids":["15773819"],"is_preprint":false},{"year":2007,"finding":"Prohibitin interacts with endogenous RNF2 in cells; co-depletion of either protein increases p16(Ink4a) expression, reducing E2F1 transcriptional activity via the p16-CDK4-Rb pathway. RNF2 and prohibitin are co-recruited to E2F1-responsive promoters (by ChIP), and their protein levels are interdependently regulated post-translationally.","method":"Co-immunoprecipitation, ChIP, siRNA knockdown, luciferase reporter assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — endogenous Co-IP, ChIP, and functional reporter assay; single lab","pmids":["17873902"],"is_preprint":false},{"year":2003,"finding":"Ring1B (Rnf2) and Ring1A proteins were identified as in vivo interactors of Bmi1 (by co-immunoprecipitation from cells), establishing their physical association within the PcG complex.","method":"Co-immunoprecipitation from mouse embryo/cell extracts","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 3 / Strong — Co-IP corroborated by multiple subsequent structural studies","pmids":["12589020"],"is_preprint":false},{"year":2003,"finding":"Ring1B and Rae28/Ph1 dissociate from chromatin upon chromatin condensation in mitotic prophase and during meiotic prophase in oocytes; this dissociation correlates temporally with transcriptional arrest in both mitosis and meiosis.","method":"Immunofluorescence with monoclonal antibodies in mitotic somatic cells and meiotic mouse oocytes","journal":"Histochemistry and cell biology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct localization by IF during cell cycle stages with transcriptional correlation; single lab","pmids":["12883906"],"is_preprint":false},{"year":2017,"finding":"RNF2 acts as an E3 ligase that targets SIK1 for ubiquitination and proteasomal degradation; direct physical interaction between RNF2 and SIK1 was demonstrated, and RNF2 knockdown restores SIK1 levels inhibiting HCC growth.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, RNF2 knockdown rescue experiment, xenograft model","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus in vitro ubiquitination plus xenograft rescue; single lab","pmids":["27911266"],"is_preprint":false},{"year":2021,"finding":"RNF2 acts as an E3 ligase that promotes ubiquitination and proteasomal degradation of IRF4; RNF2 physically interacts with IRF4 by co-immunoprecipitation, and RNF2 overexpression increases IRF4 ubiquitination and promotes colon cancer cell proliferation and invasion in an IRF4-dependent manner.","method":"Co-immunoprecipitation, ubiquitination assay, RNF2 overexpression/knockdown, xenograft model","journal":"Biochimica et biophysica acta. Molecular cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ubiquitination assay plus functional rescue; single lab","pmids":["34670117"],"is_preprint":false},{"year":2015,"finding":"RNF2-mediated invasive/metastatic behavior in melanoma depends on its ability to monoubiquitinate H2AK119 at the LTBP2 promoter, silencing this negative regulator of TGFβ signaling; in contrast, RNF2's oncogenic/proliferative activity does not require its catalytic activity but instead involves MEK1-mediated phosphorylation of RNF2, which recruits histone activators UTX and p300 to CCND2 promoter to drive its transcriptional upregulation.","method":"Gain- and loss-of-function studies, catalytic-dead RNF2 mutant, ChIP-seq, MEK1 phosphorylation assay, mouse and human melanoma models","journal":"Cancer discovery","confidence":"High","confidence_rationale":"Tier 2 / Strong — catalytic-dead mutant separating two mechanisms, ChIP-seq, kinase assay, multiple orthogonal methods in mouse and human systems","pmids":["26450788"],"is_preprint":false},{"year":2022,"finding":"Bmi-1-RING1B complex directly ubiquitinates GATA4; GATA4 ubiquitination is recognized by p62 and targets GATA4 for selective autophagic (not proteasomal) degradation. Bmi-1 binds RING1B residues 1–179 and GATA4 C-terminus (residues 206–443 zinc fingers) via its residues 1–95; RING1B binds GATA4 C-terminus via its own C-terminus (residues 180–336).","method":"Co-immunoprecipitation, domain mapping, ubiquitination assay, autophagy flux assay, Bmi-1 knockout and transgenic mice, AAV9 in vivo gene delivery","journal":"Clinical and translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP domain mapping, ubiquitination assay, in vivo genetic models; single lab","pmids":["35390228"],"is_preprint":false},{"year":2021,"finding":"De novo missense variants in RNF2 (p.R70H and p.S82R) are associated with a neurodevelopmental disorder; structural analyses indicate R70H likely disrupts the Ring1B–Bmi1 interaction interface, and S82R likely disrupts Ring1B–histone H2A interaction. Functional studies in Drosophila confirm both variants behave as loss-of-function alleles in vivo.","method":"Structural analysis of variant positions, Drosophila in vivo functional assay with equivalent alleles","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — structural prediction combined with in vivo Drosophila LOF validation; single study","pmids":["33864376"],"is_preprint":false},{"year":2017,"finding":"Intrinsically disordered protein NUPR1 binds the C-terminal region of RING1B with affinity ~10 μM; the binding region on NUPR1 involves a hydrophobic patch at its 30s region (Ala33); mutation of Ala33 reduces binding in vitro, in silico, and in cellulo. Trifluoperazine inhibits the NUPR1–C-RING1B interaction.","method":"NMR mapping, ITC, computational docking, site-directed mutagenesis (A33Q, T68Q), bimolecular fluorescence complementation (in cellulo)","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — NMR, ITC, mutagenesis, and in cellulo interaction assay; single lab","pmids":["28720707"],"is_preprint":false},{"year":2008,"finding":"NMR analysis of the C-terminal region of RING1B (C-RING1B) shows it has flexible regions that transition to a conformationally tightened state upon binding the Pc cbox domain; both N- and C-terminal halves of C-RING1B can interact with each other intramolecularly, suggesting an intramolecular interaction that is stabilized by cbox binding.","method":"NMR spectroscopy, analytical ultracentrifugation, ITC, dissociation constant measurement","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — NMR with binding characterization; single lab, no mutagenesis","pmids":["18616292"],"is_preprint":false},{"year":2020,"finding":"BMI1 and RNF2 suppress transcription-replication conflicts (TRCs) and common fragile site (CFS) instability; depletion of either causes slower replication forks, fork stalling, increased RNA Pol II occupancy at CFSs, increased RNAPII-replisome associations (proximity ligation), and increased FANCD2/RNH1 at CFSs (R-loop markers). RNF2-deficient cells depend on FANCD2/FANCI fork-protective factors for survival.","method":"DNA fiber assay, proximity ligation assay, ChIP, CRISPR-KO of RNF2, FANCD2/FANCI depletion epistasis","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (fiber assay, PLA, ChIP, genetic epistasis) establishing non-canonical role; CRISPR KO rigorously controlled","pmids":["32142505"],"is_preprint":false},{"year":2020,"finding":"RING1B colocalizes with EWSR1-FLI1 at active enhancers in Ewing sarcoma (in addition to its canonical repressive activity at Polycomb-regulated developmental genes), and is required for EWSR1-FLI1 recruitment to its enhancers and expression of key oncogenic targets; RING1B knockdown impairs xenograft tumor growth.","method":"ChIP-seq, RING1B knockdown, xenograft tumor model, pharmacological AURKB inhibition","journal":"Science advances","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq plus KD with functional readouts; single lab","pmids":["33097530"],"is_preprint":false},{"year":2021,"finding":"RNF2 acts as an E3 ligase for RASSF10, promoting its ubiquitination and degradation; NPM-dependent downregulation of RNF2 is required to maintain stable RASSF10 levels for mitotic arrest (G2/M). Physical interaction between RNF2 and RASSF10 was demonstrated by co-immunoprecipitation.","method":"LC-MS/MS, co-immunoprecipitation, ubiquitination assay, RNF2 knockdown rescue, live cell imaging","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — LC-MS/MS identification plus Co-IP plus ubiquitination assay plus functional epistasis; single lab","pmids":["34224728"],"is_preprint":false}],"current_model":"RNF2/RING1B is the catalytic RING finger E3 ubiquitin ligase subunit of Polycomb Repressive Complex 1 (PRC1) that monoubiquitinates histone H2A at lysine 119 (H2AK119ub1); its activity is stimulated by heterodimerization with BMI1/Bmi1 (structurally characterized by crystal structures of the RING-RING complex), regulated by self-generated atypical mixed polyubiquitin chains (required for H2A ligase activity) and by E6-AP-mediated canonical K48 ubiquitination (targeting it for degradation) as well as USP7-mediated deubiquitination; RNF2 additionally ubiquitinates non-histone substrates (AMBRA1, p53, SIK1, IRF4, RASSF10, HPIP, GATA4), is modified by p38 MAPK and ERK1/2 phosphorylation and O-GlcNAcylation that regulate its genomic targeting, interacts via its C-terminal domain with Cbx proteins and RYBP to direct PRC1 to distinct chromatin loci, suppresses interferon-STAT1 signaling through K33-linked STAT1 ubiquitination, supports DNA replication fork progression by preventing R-loop formation, and plays essential roles in embryonic development, stem cell self-renewal, X chromosome inactivation initiation, and imprinted gene silencing."},"narrative":{"mechanistic_narrative":"RNF2 (RING1B) is the catalytic RING-finger E3 ubiquitin ligase of Polycomb Repressive Complex 1 that monoubiquitinates histone H2A at lysine 119 to enforce chromatin-based transcriptional repression essential for development and stem-cell identity [PMID:16710298, PMID:16714294, PMID:12589020]. Its ligase activity depends on heterodimerization with BMI1, whose RING domain is embraced by the Ring1B N-terminal arm; the catalytic residues lie in Ring1B, BMI1 acts allosterically, and the heterodimer recruits the E2 UbcH5c and engages nucleosomal substrate through both a heterodimer-specific basic DNA-binding surface and the nucleosome acidic patch [PMID:16710298, PMID:16714294, PMID:21772249, PMID:24603765]. Activity is further gated by atypical self-generated K6/K27/K48 mixed polyubiquitin chains that are required for H2A ligase function, and the same lysines are competitively modified by E6-AP/UBE3A as K48 chains that drive proteasomal degradation, while USP7 deubiquitinates and stabilizes Ring1B — establishing a ubiquitin-based switch between activation and turnover [PMID:17157253, PMID:20351251, PMID:20800574]. The Ring1B C-terminal ubiquitin-like domain provides combinatorial targeting by binding Cbx proteins, the Polycomb cbox, and RYBP at a shared surface, directing PRC1 to distinct chromatin loci [PMID:20696397, PMID:19791798]. RNF2 governs higher-order genome organization in X chromosome inactivation initiation and imprinted gene silencing, acting non-redundantly with PRC2 [PMID:15509584, PMID:18848501], and beyond chromatin it sustains DNA replication-fork progression by limiting R-loops and transcription–replication conflicts, with the FBXL10–RNF68–RNF2 complex seeding H2AK119ub at DNA-damage sites to promote homologous recombination [PMID:30413623, PMID:32142505, PMID:29985131]. RNF2 additionally ubiquitinates a range of non-histone substrates — AMBRA1, p53 (with MDM2), STAT1 (K33-linked, suppressing interferon signaling), and others — coupling Polycomb to autophagy, apoptosis, and innate immunity [PMID:24980959, PMID:23318437, PMID:29242538]. Its targeting and dual catalytic/non-catalytic outputs are modulated by p38/ERK and MEK1 phosphorylation and by O-GlcNAcylation [PMID:19405034, PMID:26450788, PMID:26100231]. De novo missense variants p.R70H and p.S82R cause a neurodevelopmental disorder, acting as loss-of-function alleles that disrupt the Ring1B–BMI1 or Ring1B–H2A interface [PMID:33864376].","teleology":[{"year":1998,"claim":"Established the physical basis of Polycomb assembly by showing RNF2/RING1B directly heterodimerizes with Bmi-1 through their RING fingers, defining the core protein–protein architecture later found to be catalytic.","evidence":"Yeast two-hybrid and RING-finger domain mapping, also identifying a stable Ph/MPh2 heterotrimer","pmids":["9627119"],"confidence":"Medium","gaps":["No catalytic function assigned to the dimer","In vitro interaction only, no structure"]},{"year":2003,"claim":"Demonstrated that Rnf2 is genetically essential, with loss causing gastrulation arrest rescued by Cdkn2a inactivation, placing Polycomb repression of the Ink4a/ARF locus downstream of Rnf2 in development.","evidence":"Conventional knockout mouse with Rnf2 × Cdkn2a genetic epistasis; Co-IP confirming Bmi1 association","pmids":["12589020"],"confidence":"High","gaps":["Did not define the molecular activity responsible","Other lethality contributors beyond Cdkn2a not resolved"]},{"year":2006,"claim":"Resolved the central question of which subunit is catalytic, establishing Ring1B as the H2A-ubiquitinating E3 whose activity is enhanced by BMI1, via crystal structures of the RING-RING heterodimer plus active-site mutagenesis.","evidence":"Crystal structures of Ring1B/Bmi1 RING-RING dimer, in vitro nucleosomal ubiquitination, E2/E3 interface mutagenesis (two companion studies)","pmids":["16710298","16714294"],"confidence":"High","gaps":["How the dimer engages the nucleosome substrate not yet defined","E2 contacts not crystallized"]},{"year":2006,"claim":"Uncovered a self-modification requirement, showing Ring1B builds atypical mixed K6/K27/K48 polyubiquitin chains on itself that are necessary for its H2A ligase activity.","evidence":"In vitro ubiquitination with MS linkage mapping and mutant-ubiquitin controls","pmids":["17157253"],"confidence":"High","gaps":["Mechanism by which self-chains stimulate catalysis unclear","In vivo relevance not yet shown"]},{"year":2010,"claim":"Defined a ubiquitin-based activation/degradation switch, showing E6-AP adds degradative K48 chains on the same lysines used for activating self-modification, while USP7 reverses ubiquitination to stabilize Ring1B.","evidence":"In vitro ubiquitination/deubiquitination, Co-IP, E6-AP knockout mouse with H2Aub and HoxB9 readouts","pmids":["20351251","20800574"],"confidence":"High","gaps":["USP7 study did not distinguish activating vs degradative chains","Signals dictating switch direction in vivo unknown"]},{"year":2011,"claim":"Provided a substrate-recognition mechanism, showing the heterodimer presents UbcH5c on Ring1B and a heterodimer-unique basic surface that binds DNA, required for nucleosomal H2A ubiquitination.","evidence":"Crystal structure of Bmi1/Ring1B–UbcH5c, mutagenesis, in vitro ubiquitination, nucleosome docking","pmids":["21772249"],"confidence":"High","gaps":["Full nucleosome-bound structure not experimentally determined","Acidic-patch contribution defined only later"]},{"year":2014,"claim":"Showed the nucleosome acidic patch is an essential docking determinant for RING1B/BMI1-mediated H2A ubiquitination, linking the mark to DNA damage response.","evidence":"In vitro ubiquitination with acidic-patch mutant nucleosomes, viral LANA peptide perturbation, ChIP, immunofluorescence","pmids":["24603765"],"confidence":"High","gaps":["Structural detail of acidic-patch engagement inferred","Generality across PRC1 variants not tested here"]},{"year":2010,"claim":"Explained combinatorial chromatin targeting, showing the Ring1B C-terminal ubiquitin-like domain binds Cbx, the Pc cbox, and RYBP at a shared surface forming near-identical interfaces with structurally diverse partners.","evidence":"Crystal structure of C-RING1B–cbox, NMR, mutagenesis, Drosophila chromatin association (building on earlier NMR/structure work)","pmids":["20696397","19791798","18616292"],"confidence":"High","gaps":["Which partner dominates at specific loci in vivo not fully resolved","Regulation of partner choice unknown"]},{"year":2008,"claim":"Established that PRC1 (via Rnf2) and PRC2 act non-redundantly in higher-order genome organization, each independently required for imprinted-cluster contraction and silencing, and for X-inactivation initiation.","evidence":"Conditional knockout embryos, 3D-FISH/RNA-FISH; earlier ES-cell conditional KO and Xi localization studies","pmids":["18848501","17620408","15509584"],"confidence":"High","gaps":["Direct cause of genomic contraction not mechanistically defined","Relationship between H2Aub and folding unresolved"]},{"year":2015,"claim":"Revealed that much of PRC1-mediated repression and early development are independent of RING1B catalytic activity, separating enzymatic from scaffolding/targeting functions.","evidence":"Catalytic-dead RING1B knockin mouse, ChIP-seq, transcriptomics","pmids":["26385961"],"confidence":"High","gaps":["Which functions strictly require catalysis not enumerated","Compensatory mechanisms not defined"]},{"year":2020,"claim":"Defined a non-canonical genome-protective role, showing RNF2/BMI1 suppress R-loops, transcription–replication conflicts, and fragile-site instability to sustain replication-fork progression.","evidence":"DNA fiber assays, proximity ligation, ChIP, CRISPR-KO, FANCD2/FANCI epistasis, RNaseH rescue (multiple studies)","pmids":["30413623","32142505","26272920","29985131"],"confidence":"High","gaps":["How H2AK119ub mechanistically resolves R-loops unclear","Tissue/cell-type generality not fully mapped"]},{"year":2017,"claim":"Extended RNF2 beyond chromatin to immune signaling, showing nuclear RNF2 adds K33-linked ubiquitin to STAT1 at K379 to evict STAT1/STAT2 from DNA and suppress interferon-stimulated genes.","evidence":"E3 ligase screen, Co-IP, K379R mutagenesis, in vitro ubiquitination, ChIP, conditional KO","pmids":["29242538"],"confidence":"High","gaps":["Upstream signals localizing RNF2 to STAT1 unknown","Whether PRC1 partners participate not addressed"]},{"year":2014,"claim":"Demonstrated non-histone proteasomal substrate ubiquitination by RNF2, exemplified by WASH-recruited AMBRA1 K48 ubiquitination that downregulates autophagy.","evidence":"Co-IP, in vitro ubiquitination, K45 mutagenesis, autophagy flux, RNF2/WASH depletion","pmids":["24980959"],"confidence":"High","gaps":["Structural basis of substrate selection not defined","Relationship to PRC1 assembly unclear"]},{"year":2015,"claim":"Showed RNF2 drives cancer phenotypes through catalysis-dependent and catalysis-independent routes, with MEK1 phosphorylation recruiting UTX/p300 for transcriptional activation versus H2AK119ub-mediated silencing.","evidence":"Catalytic-dead mutant, ChIP-seq, MEK1 phosphorylation assay, melanoma models; supported by phospho-site and O-GlcNAc mapping","pmids":["26450788","19405034","26100231"],"confidence":"High","gaps":["Switch between activator and repressor modes incompletely defined","Generality of activation function across loci unknown"]},{"year":2021,"claim":"Linked RNF2 to human disease, identifying de novo p.R70H and p.S82R variants in a neurodevelopmental disorder that act as loss-of-function alleles disrupting BMI1 or H2A interfaces.","evidence":"Structural analysis of variant positions and Drosophila in vivo functional assays","pmids":["33864376"],"confidence":"Medium","gaps":["Interface disruption inferred from structure, not co-crystals of variants","Mammalian phenotypic modeling limited"]},{"year":null,"claim":"How RNF2 selects between its many non-histone substrates (p53, SIK1, IRF4, RASSF10, GATA4) and how its diverse post-translational modifications and partner switches are coordinated in vivo to dictate chromatin versus non-chromatin output remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model of substrate choice","Spatiotemporal control of catalytic vs scaffold roles undefined","Many non-histone substrates rest on single-lab Co-IP/ubiquitination data"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[0,1,2,3,4,15,17,19,32,33,35,41]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,2,15,17,19,20]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[2]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[0,1,20]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[14,25,34]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[7,8,19,31]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[7,14,24,31]}],"pathway":[{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[0,8,11,23]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[6,14,19,34]},{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[21,22,39]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[24]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[3,4,15,17,32,33]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[6,9,36]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[19]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[15,35]}],"complexes":["PRC1","FBXL10-RNF68-RNF2 (FRRUC)","Ring1B-Fbxl10-BcoR complex"],"partners":["BMI1","RYBP","CBX","USP7","UBE3A","MDM2","STAT1","FBXL10"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q99496","full_name":"E3 ubiquitin-protein ligase RING2","aliases":["Huntingtin-interacting protein 2-interacting protein 3","HIP2-interacting protein 3","Protein DinG","RING finger protein 1B","RING1b","RING finger protein 2","RING finger protein BAP-1","RING-type E3 ubiquitin transferase RING2"],"length_aa":336,"mass_kda":37.7,"function":"E3 ubiquitin-protein ligase that mediates monoubiquitination of 'Lys-119' of histone H2A (H2AK119Ub), thereby playing a central role in histone code and gene regulation (PubMed:15386022, PubMed:16359901, PubMed:21772249, PubMed:25355358, PubMed:25519132, PubMed:26151332, PubMed:33864376). H2AK119Ub gives a specific tag for epigenetic transcriptional repression and participates in X chromosome inactivation of female mammals. May be involved in the initiation of both imprinted and random X inactivation (By similarity). Essential component of a Polycomb group (PcG) multiprotein PRC1-like complex, a complex class required to maintain the transcriptionally repressive state of many genes, including Hox genes, throughout development (PubMed:16359901, PubMed:26151332). PcG PRC1 complex acts via chromatin remodeling and modification of histones, rendering chromatin heritably changed in its expressibility (PubMed:26151332). E3 ubiquitin-protein ligase activity is enhanced by BMI1/PCGF4 (PubMed:21772249). Acts as the main E3 ubiquitin ligase on histone H2A of the PRC1 complex, while RING1 may rather act as a modulator of RNF2/RING2 activity (Probable). Association with the chromosomal DNA is cell-cycle dependent. In resting B- and T-lymphocytes, interaction with AURKB leads to block its activity, thereby maintaining transcription in resting lymphocytes (By similarity). Also acts as a negative regulator of autophagy by mediating ubiquitination of AMBRA1, leading to its subsequent degradation (By similarity)","subcellular_location":"Nucleus; Cytoplasm; Chromosome","url":"https://www.uniprot.org/uniprotkb/Q99496/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RNF2","classification":"Not Classified","n_dependent_lines":9,"n_total_lines":1208,"dependency_fraction":0.0074503311258278145},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"RING1","stoichiometry":10.0},{"gene":"CSNK2B","stoichiometry":4.0},{"gene":"DYNC1I2","stoichiometry":4.0},{"gene":"H2AFZ","stoichiometry":0.2},{"gene":"HIST2H2BE","stoichiometry":0.2},{"gene":"HMGA1","stoichiometry":0.2},{"gene":"PARP1","stoichiometry":0.2},{"gene":"PDCD6IP","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/RNF2","total_profiled":1310},"omim":[{"mim_id":"619460","title":"LUO-SCHOCH-YAMAMOTO SYNDROME; LUSYAM","url":"https://www.omim.org/entry/619460"},{"mim_id":"618844","title":"L3MBTL HISTONE METHYL-LYSINE-BINDING PROTEIN 3; L3MBTL3","url":"https://www.omim.org/entry/618844"},{"mim_id":"617543","title":"POLYCOMB GROUP RING FINGER PROTEIN 3; PCGF3","url":"https://www.omim.org/entry/617543"},{"mim_id":"617438","title":"CHROMOBOX 6; CBX6","url":"https://www.omim.org/entry/617438"},{"mim_id":"617407","title":"POLYCOMB GROUP RING FINGER PROTEIN 5; PCGF5","url":"https://www.omim.org/entry/617407"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"},{"location":"Nuclear bodies","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/RNF2"},"hgnc":{"alias_symbol":["BAP-1","BAP1","DING","HIPI3","RING1B","RING2"],"prev_symbol":[]},"alphafold":{"accession":"Q99496","domains":[{"cath_id":"3.10.20.90","chopping":"224-330","consensus_level":"high","plddt":84.9423,"start":224,"end":330}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q99496","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q99496-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q99496-F1-predicted_aligned_error_v6.png","plddt_mean":77.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RNF2","jax_strain_url":"https://www.jax.org/strain/search?query=RNF2"},"sequence":{"accession":"Q99496","fasta_url":"https://rest.uniprot.org/uniprotkb/Q99496.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q99496/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q99496"}},"corpus_meta":[{"pmid":"16710298","id":"PMC_16710298","title":"Structure 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Crystal structure of the Ring1B/Bmi1 RING-RING heterodimer reveals that Ring1B's N-terminal arm embraces the Bmi1 RING domain, and mutation of the critical E2/E3 interface residue in Ring1B abolishes activity while the equivalent Bmi1 mutation does not, demonstrating catalytic activity resides in Ring1B.\",\n      \"method\": \"In vitro ubiquitination assay, active-site mutagenesis, crystal structure of Ring1B/Bmi1 RING-RING heterodimer\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus in vitro reconstitution plus mutagenesis; independently replicated in companion JBC paper (PMID:16714294)\",\n      \"pmids\": [\"16710298\", \"16714294\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"A 2.5-Å crystal structure of the Bmi1-Ring1B core domain complex shows Ring1B 'hugs' Bmi1 through extensive RING domain contacts and an N-terminal tail that wraps around Bmi1; both contact regions synergistically enhance E3 ligase activity toward nucleosomal H2A by stabilizing the E2 enzyme-substrate interaction.\",\n      \"method\": \"Crystal structure (2.5 Å), in vitro ubiquitin transfer assay, domain mapping\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution crystal structure with functional validation; corroborated by companion EMBO J paper\",\n      \"pmids\": [\"16714294\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Crystal structure of the Bmi1/Ring1B RING-RING heterodimer in complex with E2 enzyme UbcH5c shows UbcH5c contacts Ring1B only; additionally, the Bmi1/Ring1B dimer binds duplex DNA through a basic surface patch unique to the heterodimer, and mutation of this surface abolishes H2A ubiquitination activity, revealing a novel nucleosome substrate-recognition mechanism.\",\n      \"method\": \"Crystal structure of Bmi1/Ring1B-UbcH5c complex, mutagenesis, in vitro ubiquitination assay, computational nucleosome docking\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus mutagenesis plus in vitro activity assay in a single study\",\n      \"pmids\": [\"21772249\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Ring1B generates atypical mixed K6-, K27-, and K48-based polyubiquitin chains through self-ubiquitination; this non-canonical self-modification is required for Ring1B's ability to monoubiquitinate histone H2A in vitro. Bmi1 has no self-ubiquitinating activity. Both Ring1B and Bmi1 are degraded by an exogenous E3 independent of their RING domains.\",\n      \"method\": \"In vitro ubiquitination assay, mass spectrometry linkage mapping, mutant ubiquitin analysis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with MS-based chain characterization and mutant ubiquitin controls in a single rigorous study\",\n      \"pmids\": [\"17157253\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"E6-AP (UBE3A) ubiquitin ligase targets Ring1B for K48-linked polyubiquitination and proteasomal degradation; both Ring1B self-ubiquitination and E6-AP-mediated ubiquitination target the same lysine residues, creating mutually exclusive modifications that dictate activation versus degradation. E6-AP knockout mice display elevated Ring1B and ubiquitinated H2A levels with repressed HoxB9 expression in vivo.\",\n      \"method\": \"In vitro ubiquitination assay, co-immunoprecipitation, E6-AP knockout mouse analysis, immunoblot\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal biochemical assays plus in vivo genetic knockout with defined molecular readouts; replicated conceptually from prior PMID:17157253\",\n      \"pmids\": [\"20351251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"USP7 deubiquitinase interacts with Ring1B (via its RING domain) and directly deubiquitinates Ring1B both in vitro and in vivo, stabilizing Ring1B without discriminating between its activating and proteolysis-targeting polyubiquitin chain forms. USP7 is also found in a complex with other Polycomb proteins.\",\n      \"method\": \"Co-immunoprecipitation, in vitro deubiquitination assay, in vivo ubiquitination analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus in vitro and in vivo deubiquitination assays, single lab\",\n      \"pmids\": [\"20800574\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Genetic ablation of Rnf2 (Ring1B) in mice causes gastrulation arrest and early embryonic lethality; this phenotype is partially rescued by concurrent genetic inactivation of the Cdkn2a (Ink4a/ARF) locus, placing Polycomb-mediated Cdkn2a repression downstream of Rnf2 during early development.\",\n      \"method\": \"Conventional knockout mouse, genetic epistasis (Rnf2 null × Cdkn2a null double mutant)\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean loss-of-function KO plus genetic epistasis with clear developmental phenotype readout\",\n      \"pmids\": [\"12589020\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Ring1B localizes to the inactive X chromosome (Xi) in female trophoblast stem (TS) and differentiating embryonic stem (ES) cells, and ubiquitinated H2A at K119 co-enriches at Xi; this enrichment is transient during differentiation, implicating Ring1B-mediated H2AK119ub in initiation but not maintenance of X chromosome inactivation.\",\n      \"method\": \"Immunofluorescence, chromatin immunoprecipitation, cell fractionation in TS and ES cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization by IF plus ChIP, single lab\",\n      \"pmids\": [\"15509584\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Ring1B deletion in mouse ES cells causes loss of several PRC1 proteins (unanticipated function in regulating PcG protein levels), derepression of lineage genes, and establishes chromosome-wide H2AK119ub upon Xist expression; however, Xist-mediated X chromosome silencing initiation is independent of Ring1B.\",\n      \"method\": \"Conditional knockout mouse ES cells, immunoblot, immunofluorescence, gene expression analysis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean conditional KO with multiple orthogonal readouts including protein level, chromatin mark, and transcriptional analyses\",\n      \"pmids\": [\"17620408\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In vivo, Polycomb proteins Ezh2 (PRC2) and Rnf2 (PRC1) are each independently required for genomic contraction of imprinted clusters and imprinted gene silencing, establishing that PRC1 (via Rnf2) and PRC2 perform non-redundant roles in establishing higher-order chromatin organization at imprinted loci.\",\n      \"method\": \"Conditional knockout mouse embryos (Rnf2 and Ezh2 separately), 3D-FISH for genomic contraction, RNA FISH for imprinted gene expression\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function in vivo with structural and transcriptional readouts, two proteins tested independently\",\n      \"pmids\": [\"18848501\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Proteomics of in vivo biotinylated Ring1B identifies ~50 interacting proteins in erythroid cells, including LSD1/Aof2 and Fbxl10/Jhdm1B histone demethylases, BcoR corepressor, CK2α, Skp1, and Nspc1/Pcgf1, forming a novel Ring1B-Fbxl10-BcoR complex distinct from canonical PRC1 and E2F6 complexes.\",\n      \"method\": \"Streptavidin pulldown of biotinylated Ring1B, mass spectrometry identification, co-purification of Fbxl10 complex\",\n      \"journal\": \"Molecular & cellular proteomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS-based interactome with orthogonal complex isolation, single lab\",\n      \"pmids\": [\"17296600\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The C-terminal domain of Ring1B (C-RING1B) binds both the Polycomb (Pc) cbox domain and RYBP at the same surface, with each partner forming a nearly identical intermolecular beta sheet with C-Ring1B despite having no sequence identity, suggesting PcG targeting to different chromatin locations relies on structurally diverse binding partners of C-Ring1B.\",\n      \"method\": \"Crystal structure of C-RING1B–Pc cbox complex, NMR, mutagenesis, transcription repression assays, Drosophila in vivo chromatin association\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus NMR plus mutagenesis plus in vivo functional validation in Drosophila\",\n      \"pmids\": [\"20696397\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The C-terminal domain of Ring1B adopts a ubiquitin-like fold with a conserved surface that mediates binding to Cbx proteins (PRC1 members) and homodimerization; mutational analysis confirms this conserved surface is responsible for Cbx interaction.\",\n      \"method\": \"Crystal structure of C-terminal Ring1B domain, mutational analysis, binding assays\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution crystal structure with mutagenesis validation\",\n      \"pmids\": [\"19791798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Bmi-1 directly interacts with the RING finger protein dinG/RING1B via their RING finger domains (heterodimerization requires intact RING fingers of both proteins plus additional flanking residues); both proteins also independently interact with the Polyhomeotic protein MPh2 through non-RING domains, forming a stable heterotrimer.\",\n      \"method\": \"Yeast two-hybrid, domain mapping with RING finger mutants\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid with domain mapping; predates biochemical confirmation by later structural work\",\n      \"pmids\": [\"9627119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Ring1B forms protein complexes containing Rae28/Mph1, M33, and Mel18 (other PcG proteins) that associate with chromosomal DNA in vivo; a hypomorphic Ring1B mouse displays posterior homeotic transformations and mild Hox gene derepression, and Ring1B overexpression in chick embryos represses Hoxb9, confirming Ring1B's role in Hox gene regulation by PcG complexes.\",\n      \"method\": \"Co-immunoprecipitation from embryo extracts, hypomorphic knockin mouse, chick embryo overexpression, RNA in situ hybridization\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus in vivo genetic and gain-of-function approaches, single lab\",\n      \"pmids\": [\"12183370\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RNF2 is recruited by WASH to ubiquitinate AMBRA1 via K48-linked chains at lysine 45, targeting AMBRA1 for proteasomal degradation and thereby downregulating autophagy; WASH deficiency impairs RNF2–AMBRA1 association and prevents AMBRA1 degradation.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, site-directed mutagenesis (K45), autophagy flux assay, RNF2 and WASH knockdown/knockout\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro ubiquitination reconstitution, site-specific mutagenesis, co-IP, and functional autophagy readout in a single study\",\n      \"pmids\": [\"24980959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Aurora B kinase phosphorylates histone H3S28 at active promoters in resting B cells, which inhibits Ring1B-mediated H2A ubiquitination and enhances binding and activity of the USP16 deubiquitinase at transcribed genes; conditional knockout of either Aurora B or Ring1B reduces RNA Pol II binding to promoters and decreases cell viability in quiescent lymphocytes.\",\n      \"method\": \"Conditional knockout, ChIP-seq, in vitro ubiquitination assay, kinase assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — conditional KO of both proteins, ChIP-seq, and in vitro enzymatic assays establishing mechanistic link\",\n      \"pmids\": [\"24034696\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RNF2 functions as an E3 ligase that targets p53 for proteasomal degradation; this activity requires Bmi1. RNF2 directly binds both p53 and MDM2, promotes MDM2-mediated p53 ubiquitination, and increases MDM2 stability by inhibiting its ubiquitination. RNF2 knockdown increases p53 protein levels and half-life and induces apoptosis in p53-dependent manner.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, protein half-life measurement, RNF2 knockdown/overexpression in isogenic p53+/+ and p53-/- cells\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple biochemical assays (Co-IP, in vitro ubiquitination, half-life), isogenic cell lines; single lab\",\n      \"pmids\": [\"23318437\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RNF2 (with Bmi1) acts as an E3 ligase that targets p53 for degradation specifically in germ-cell tumor lines; knockdown of RNF2 induces p53-dependent apoptosis and reduces tumor xenograft growth, while simultaneous p53 knockdown rescues these effects.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, xenograft tumor models, RNF2/p53 double knockdown\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, in vitro assay, xenograft rescue; single lab, complements PMID:23318437\",\n      \"pmids\": [\"23319651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Nuclear RNF2 directly binds STAT1 after interferon stimulation and promotes K33-linked polyubiquitination of STAT1 at K379 (within its DNA-binding domain), causing STAT1/STAT2 dissociation from DNA and suppression of interferon-stimulated gene transcription; RNF2 deficiency enhances ISG expression and antiviral responses.\",\n      \"method\": \"High-content E3 ligase screen, co-immunoprecipitation, site-directed mutagenesis (K379R), in vitro ubiquitination assay, ChIP, RNF2 conditional knockout\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro ubiquitination, site-specific mutagenesis, Co-IP, ChIP, and genetic KO with transcriptional readouts in a single study\",\n      \"pmids\": [\"29242538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The nucleosome acidic patch is required for RING1B/BMI1-dependent H2A ubiquitination both in vivo and in vitro; nucleosomes with mutated acidic patch are defective substrates for RING1B/BMI1 ubiquitination in vitro, and perturbation of the acidic patch in vivo by viral LANA peptide impairs H2AXub and DDR signaling.\",\n      \"method\": \"In vitro ubiquitination assay with acidic-patch mutant nucleosomes, in vivo viral LANA peptide expression, ChIP, immunofluorescence\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro reconstitution with mutant nucleosomes plus orthogonal in vivo perturbation with defined readouts\",\n      \"pmids\": [\"24603765\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RNF2/Ring1B is required to support DNA replication fork progression; its depletion causes R-loop (RNA:DNA hybrid) accumulation that impairs replication. Mdm2 overexpression rescues RNF2 depletion for fork progression (and vice versa), and this rescue requires H2A ubiquitination sites K118/K119. RNaseH overexpression or CDK9 inhibition also rescues fork progression upon RNF2 depletion.\",\n      \"method\": \"DNA fiber assay, RNF2/Mdm2 knockdown, H2A K118/K119 mutant rescue, RNaseH overexpression, S9.6 antibody R-loop detection\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal rescue experiments establishing mechanism, fiber assays plus R-loop detection, multiple labs consistent\",\n      \"pmids\": [\"30413623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"RING1B/RING1A mono-ubiquitination of H2AK119 at pericentromeric heterochromatin is required for S-phase progression; conditional inactivation of both E3 ligases causes replication fork slowing and stalling specifically at pericentromeric regions during mid-S phase, with double-strand break accumulation at chromocenters, and this is rescued by targeted H2AK119ub at pericentromeric chromatin.\",\n      \"method\": \"Conditional double knockout of RING1A/RING1B, DNA fiber assay, γH2AX immunofluorescence, targeted monoubiquitination rescue via MBD1 fusion\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean double KO, DNA fiber assay, targeted rescue experiment establishing mechanistic specificity\",\n      \"pmids\": [\"26272920\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The E3 ubiquitin ligase activity of RING1B is dispensable for early mouse embryonic development and for much of PRC1-mediated gene repression in ES cells; PRC1 and PRC2 reinforce each other's chromatin binding but key PRC1 functions extend beyond RING1B's enzymatic activity.\",\n      \"method\": \"Catalytic-dead RING1B knockin mouse, ChIP-seq, gene expression analysis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — catalytic-dead knockin mouse with ChIP-seq and transcriptomics; single lab but rigorous genetic approach\",\n      \"pmids\": [\"26385961\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The FBXL10-RNF68-RNF2 ubiquitin ligase complex (FRRUC) is rapidly and transiently recruited to DNA damage sites in a PARP1- and TIMELESS-dependent manner; FRRUC promotes H2AK119ub at damage sites, local H2A decrease, H2A.Z incorporation, DSB signaling, and homologous recombination repair. FRRUC activity is also required for subsequent recruitment of BMI1-RNF2 and MEL18-RNF2 complexes at damage sites.\",\n      \"method\": \"Live imaging, ChIP, Co-immunoprecipitation, proximity ligation, RNF2 knockout/knockdown, HR reporter assay, PARP1 inhibition\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (live imaging, ChIP, functional HR assay, genetic KO), single lab rigorous study\",\n      \"pmids\": [\"29985131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In pancreatic cancer, Ring1B physically interacts with Snail; Snail's carboxyl zinc fingers recruit Ring1B and Ring1A to target promoters, and Ring1B mediates H2AK119ub1 at these promoters to repress transcription and enable Snail-induced cell migration. EZH2 is required for Snail-Ring1A/B recruitment to target chromatin.\",\n      \"method\": \"Co-immunoprecipitation, ChIP assay, Ring1A/B double depletion, cell migration assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, ChIP with H2AK119ub1 readout, functional migration assay; single lab\",\n      \"pmids\": [\"24903147\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"RING1B is O-GlcNAcylated at residues T250/S251 and S278; T250/S251 O-GlcNAcylation decreases during differentiation and regulates RING1B genomic targeting—non-O-GlcNAcylated RING1B is enriched near cell-cycle genes whereas O-GlcNAcylated RING1B is enriched near neuronal genes.\",\n      \"method\": \"Point mutagenesis of O-GlcNAc sites, ChIP-sequencing, mass spectrometry identification of modification sites\",\n      \"journal\": \"Stem cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-directed mutagenesis plus ChIP-seq; single lab\",\n      \"pmids\": [\"26100231\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"RNF2 is phosphorylated at Ser41 by p38 MAPK and at multiple additional serine residues by ERK1/2 (MEK1/2 pathway); mass spectrometry identified co-translational N-terminal Met excision coupled to N-acetylation of Ser2, and phospho-Ser41 as a p38 MAPK site. RNF2 phosphorylation differentially modulates transcription factor expression and histone H2B acetylation.\",\n      \"method\": \"2D electrophoresis, kinase inhibitors (SB203580, PD98059), phosphatase treatment, mass spectrometry\",\n      \"journal\": \"Proteomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS-based site identification with pharmacological kinase inhibition; single lab, functional consequence partially characterized\",\n      \"pmids\": [\"19405034\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"RNF2 physically interacts with the S6' ATPase subunit of the proteasomal 19S regulatory complex; S6' contacts RNF2 via its N-terminal RING domain and RNF2 contacts S6' via its C-terminal region. RNF2-S6' interaction increases S6' ATP hydrolysis activity, suggesting RNF2 may facilitate delivery of ubiquitinated substrates to the proteasome.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping, in vitro ATPase activity assay\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain mapping plus in vitro ATPase assay; single lab\",\n      \"pmids\": [\"15773819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Prohibitin interacts with endogenous RNF2 in cells; co-depletion of either protein increases p16(Ink4a) expression, reducing E2F1 transcriptional activity via the p16-CDK4-Rb pathway. RNF2 and prohibitin are co-recruited to E2F1-responsive promoters (by ChIP), and their protein levels are interdependently regulated post-translationally.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, siRNA knockdown, luciferase reporter assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — endogenous Co-IP, ChIP, and functional reporter assay; single lab\",\n      \"pmids\": [\"17873902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Ring1B (Rnf2) and Ring1A proteins were identified as in vivo interactors of Bmi1 (by co-immunoprecipitation from cells), establishing their physical association within the PcG complex.\",\n      \"method\": \"Co-immunoprecipitation from mouse embryo/cell extracts\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Strong — Co-IP corroborated by multiple subsequent structural studies\",\n      \"pmids\": [\"12589020\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Ring1B and Rae28/Ph1 dissociate from chromatin upon chromatin condensation in mitotic prophase and during meiotic prophase in oocytes; this dissociation correlates temporally with transcriptional arrest in both mitosis and meiosis.\",\n      \"method\": \"Immunofluorescence with monoclonal antibodies in mitotic somatic cells and meiotic mouse oocytes\",\n      \"journal\": \"Histochemistry and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct localization by IF during cell cycle stages with transcriptional correlation; single lab\",\n      \"pmids\": [\"12883906\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RNF2 acts as an E3 ligase that targets SIK1 for ubiquitination and proteasomal degradation; direct physical interaction between RNF2 and SIK1 was demonstrated, and RNF2 knockdown restores SIK1 levels inhibiting HCC growth.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, RNF2 knockdown rescue experiment, xenograft model\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus in vitro ubiquitination plus xenograft rescue; single lab\",\n      \"pmids\": [\"27911266\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RNF2 acts as an E3 ligase that promotes ubiquitination and proteasomal degradation of IRF4; RNF2 physically interacts with IRF4 by co-immunoprecipitation, and RNF2 overexpression increases IRF4 ubiquitination and promotes colon cancer cell proliferation and invasion in an IRF4-dependent manner.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, RNF2 overexpression/knockdown, xenograft model\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ubiquitination assay plus functional rescue; single lab\",\n      \"pmids\": [\"34670117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"RNF2-mediated invasive/metastatic behavior in melanoma depends on its ability to monoubiquitinate H2AK119 at the LTBP2 promoter, silencing this negative regulator of TGFβ signaling; in contrast, RNF2's oncogenic/proliferative activity does not require its catalytic activity but instead involves MEK1-mediated phosphorylation of RNF2, which recruits histone activators UTX and p300 to CCND2 promoter to drive its transcriptional upregulation.\",\n      \"method\": \"Gain- and loss-of-function studies, catalytic-dead RNF2 mutant, ChIP-seq, MEK1 phosphorylation assay, mouse and human melanoma models\",\n      \"journal\": \"Cancer discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — catalytic-dead mutant separating two mechanisms, ChIP-seq, kinase assay, multiple orthogonal methods in mouse and human systems\",\n      \"pmids\": [\"26450788\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Bmi-1-RING1B complex directly ubiquitinates GATA4; GATA4 ubiquitination is recognized by p62 and targets GATA4 for selective autophagic (not proteasomal) degradation. Bmi-1 binds RING1B residues 1–179 and GATA4 C-terminus (residues 206–443 zinc fingers) via its residues 1–95; RING1B binds GATA4 C-terminus via its own C-terminus (residues 180–336).\",\n      \"method\": \"Co-immunoprecipitation, domain mapping, ubiquitination assay, autophagy flux assay, Bmi-1 knockout and transgenic mice, AAV9 in vivo gene delivery\",\n      \"journal\": \"Clinical and translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP domain mapping, ubiquitination assay, in vivo genetic models; single lab\",\n      \"pmids\": [\"35390228\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"De novo missense variants in RNF2 (p.R70H and p.S82R) are associated with a neurodevelopmental disorder; structural analyses indicate R70H likely disrupts the Ring1B–Bmi1 interaction interface, and S82R likely disrupts Ring1B–histone H2A interaction. Functional studies in Drosophila confirm both variants behave as loss-of-function alleles in vivo.\",\n      \"method\": \"Structural analysis of variant positions, Drosophila in vivo functional assay with equivalent alleles\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — structural prediction combined with in vivo Drosophila LOF validation; single study\",\n      \"pmids\": [\"33864376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Intrinsically disordered protein NUPR1 binds the C-terminal region of RING1B with affinity ~10 μM; the binding region on NUPR1 involves a hydrophobic patch at its 30s region (Ala33); mutation of Ala33 reduces binding in vitro, in silico, and in cellulo. Trifluoperazine inhibits the NUPR1–C-RING1B interaction.\",\n      \"method\": \"NMR mapping, ITC, computational docking, site-directed mutagenesis (A33Q, T68Q), bimolecular fluorescence complementation (in cellulo)\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — NMR, ITC, mutagenesis, and in cellulo interaction assay; single lab\",\n      \"pmids\": [\"28720707\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"NMR analysis of the C-terminal region of RING1B (C-RING1B) shows it has flexible regions that transition to a conformationally tightened state upon binding the Pc cbox domain; both N- and C-terminal halves of C-RING1B can interact with each other intramolecularly, suggesting an intramolecular interaction that is stabilized by cbox binding.\",\n      \"method\": \"NMR spectroscopy, analytical ultracentrifugation, ITC, dissociation constant measurement\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR with binding characterization; single lab, no mutagenesis\",\n      \"pmids\": [\"18616292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"BMI1 and RNF2 suppress transcription-replication conflicts (TRCs) and common fragile site (CFS) instability; depletion of either causes slower replication forks, fork stalling, increased RNA Pol II occupancy at CFSs, increased RNAPII-replisome associations (proximity ligation), and increased FANCD2/RNH1 at CFSs (R-loop markers). RNF2-deficient cells depend on FANCD2/FANCI fork-protective factors for survival.\",\n      \"method\": \"DNA fiber assay, proximity ligation assay, ChIP, CRISPR-KO of RNF2, FANCD2/FANCI depletion epistasis\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (fiber assay, PLA, ChIP, genetic epistasis) establishing non-canonical role; CRISPR KO rigorously controlled\",\n      \"pmids\": [\"32142505\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RING1B colocalizes with EWSR1-FLI1 at active enhancers in Ewing sarcoma (in addition to its canonical repressive activity at Polycomb-regulated developmental genes), and is required for EWSR1-FLI1 recruitment to its enhancers and expression of key oncogenic targets; RING1B knockdown impairs xenograft tumor growth.\",\n      \"method\": \"ChIP-seq, RING1B knockdown, xenograft tumor model, pharmacological AURKB inhibition\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq plus KD with functional readouts; single lab\",\n      \"pmids\": [\"33097530\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RNF2 acts as an E3 ligase for RASSF10, promoting its ubiquitination and degradation; NPM-dependent downregulation of RNF2 is required to maintain stable RASSF10 levels for mitotic arrest (G2/M). Physical interaction between RNF2 and RASSF10 was demonstrated by co-immunoprecipitation.\",\n      \"method\": \"LC-MS/MS, co-immunoprecipitation, ubiquitination assay, RNF2 knockdown rescue, live cell imaging\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — LC-MS/MS identification plus Co-IP plus ubiquitination assay plus functional epistasis; single lab\",\n      \"pmids\": [\"34224728\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RNF2/RING1B is the catalytic RING finger E3 ubiquitin ligase subunit of Polycomb Repressive Complex 1 (PRC1) that monoubiquitinates histone H2A at lysine 119 (H2AK119ub1); its activity is stimulated by heterodimerization with BMI1/Bmi1 (structurally characterized by crystal structures of the RING-RING complex), regulated by self-generated atypical mixed polyubiquitin chains (required for H2A ligase activity) and by E6-AP-mediated canonical K48 ubiquitination (targeting it for degradation) as well as USP7-mediated deubiquitination; RNF2 additionally ubiquitinates non-histone substrates (AMBRA1, p53, SIK1, IRF4, RASSF10, HPIP, GATA4), is modified by p38 MAPK and ERK1/2 phosphorylation and O-GlcNAcylation that regulate its genomic targeting, interacts via its C-terminal domain with Cbx proteins and RYBP to direct PRC1 to distinct chromatin loci, suppresses interferon-STAT1 signaling through K33-linked STAT1 ubiquitination, supports DNA replication fork progression by preventing R-loop formation, and plays essential roles in embryonic development, stem cell self-renewal, X chromosome inactivation initiation, and imprinted gene silencing.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RNF2 (RING1B) is the catalytic RING-finger E3 ubiquitin ligase of Polycomb Repressive Complex 1 that monoubiquitinates histone H2A at lysine 119 to enforce chromatin-based transcriptional repression essential for development and stem-cell identity [#0, #6]. Its ligase activity depends on heterodimerization with BMI1, whose RING domain is embraced by the Ring1B N-terminal arm; the catalytic residues lie in Ring1B, BMI1 acts allosterically, and the heterodimer recruits the E2 UbcH5c and engages nucleosomal substrate through both a heterodimer-specific basic DNA-binding surface and the nucleosome acidic patch [#0, #1, #2, #20]. Activity is further gated by atypical self-generated K6/K27/K48 mixed polyubiquitin chains that are required for H2A ligase function, and the same lysines are competitively modified by E6-AP/UBE3A as K48 chains that drive proteasomal degradation, while USP7 deubiquitinates and stabilizes Ring1B — establishing a ubiquitin-based switch between activation and turnover [#3, #4, #5]. The Ring1B C-terminal ubiquitin-like domain provides combinatorial targeting by binding Cbx proteins, the Polycomb cbox, and RYBP at a shared surface, directing PRC1 to distinct chromatin loci [#11, #12]. RNF2 governs higher-order genome organization in X chromosome inactivation initiation and imprinted gene silencing, acting non-redundantly with PRC2 [#7, #9], and beyond chromatin it sustains DNA replication-fork progression by limiting R-loops and transcription–replication conflicts, with the FBXL10–RNF68–RNF2 complex seeding H2AK119ub at DNA-damage sites to promote homologous recombination [#21, #39, #24]. RNF2 additionally ubiquitinates a range of non-histone substrates — AMBRA1, p53 (with MDM2), STAT1 (K33-linked, suppressing interferon signaling), and others — coupling Polycomb to autophagy, apoptosis, and innate immunity [#15, #17, #19]. Its targeting and dual catalytic/non-catalytic outputs are modulated by p38/ERK and MEK1 phosphorylation and by O-GlcNAcylation [#27, #34, #26]. De novo missense variants p.R70H and p.S82R cause a neurodevelopmental disorder, acting as loss-of-function alleles that disrupt the Ring1B–BMI1 or Ring1B–H2A interface [#36].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established the physical basis of Polycomb assembly by showing RNF2/RING1B directly heterodimerizes with Bmi-1 through their RING fingers, defining the core protein–protein architecture later found to be catalytic.\",\n      \"evidence\": \"Yeast two-hybrid and RING-finger domain mapping, also identifying a stable Ph/MPh2 heterotrimer\",\n      \"pmids\": [\"9627119\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No catalytic function assigned to the dimer\", \"In vitro interaction only, no structure\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstrated that Rnf2 is genetically essential, with loss causing gastrulation arrest rescued by Cdkn2a inactivation, placing Polycomb repression of the Ink4a/ARF locus downstream of Rnf2 in development.\",\n      \"evidence\": \"Conventional knockout mouse with Rnf2 × Cdkn2a genetic epistasis; Co-IP confirming Bmi1 association\",\n      \"pmids\": [\"12589020\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the molecular activity responsible\", \"Other lethality contributors beyond Cdkn2a not resolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Resolved the central question of which subunit is catalytic, establishing Ring1B as the H2A-ubiquitinating E3 whose activity is enhanced by BMI1, via crystal structures of the RING-RING heterodimer plus active-site mutagenesis.\",\n      \"evidence\": \"Crystal structures of Ring1B/Bmi1 RING-RING dimer, in vitro nucleosomal ubiquitination, E2/E3 interface mutagenesis (two companion studies)\",\n      \"pmids\": [\"16710298\", \"16714294\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the dimer engages the nucleosome substrate not yet defined\", \"E2 contacts not crystallized\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Uncovered a self-modification requirement, showing Ring1B builds atypical mixed K6/K27/K48 polyubiquitin chains on itself that are necessary for its H2A ligase activity.\",\n      \"evidence\": \"In vitro ubiquitination with MS linkage mapping and mutant-ubiquitin controls\",\n      \"pmids\": [\"17157253\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which self-chains stimulate catalysis unclear\", \"In vivo relevance not yet shown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined a ubiquitin-based activation/degradation switch, showing E6-AP adds degradative K48 chains on the same lysines used for activating self-modification, while USP7 reverses ubiquitination to stabilize Ring1B.\",\n      \"evidence\": \"In vitro ubiquitination/deubiquitination, Co-IP, E6-AP knockout mouse with H2Aub and HoxB9 readouts\",\n      \"pmids\": [\"20351251\", \"20800574\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"USP7 study did not distinguish activating vs degradative chains\", \"Signals dictating switch direction in vivo unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Provided a substrate-recognition mechanism, showing the heterodimer presents UbcH5c on Ring1B and a heterodimer-unique basic surface that binds DNA, required for nucleosomal H2A ubiquitination.\",\n      \"evidence\": \"Crystal structure of Bmi1/Ring1B–UbcH5c, mutagenesis, in vitro ubiquitination, nucleosome docking\",\n      \"pmids\": [\"21772249\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full nucleosome-bound structure not experimentally determined\", \"Acidic-patch contribution defined only later\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed the nucleosome acidic patch is an essential docking determinant for RING1B/BMI1-mediated H2A ubiquitination, linking the mark to DNA damage response.\",\n      \"evidence\": \"In vitro ubiquitination with acidic-patch mutant nucleosomes, viral LANA peptide perturbation, ChIP, immunofluorescence\",\n      \"pmids\": [\"24603765\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural detail of acidic-patch engagement inferred\", \"Generality across PRC1 variants not tested here\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Explained combinatorial chromatin targeting, showing the Ring1B C-terminal ubiquitin-like domain binds Cbx, the Pc cbox, and RYBP at a shared surface forming near-identical interfaces with structurally diverse partners.\",\n      \"evidence\": \"Crystal structure of C-RING1B–cbox, NMR, mutagenesis, Drosophila chromatin association (building on earlier NMR/structure work)\",\n      \"pmids\": [\"20696397\", \"19791798\", \"18616292\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which partner dominates at specific loci in vivo not fully resolved\", \"Regulation of partner choice unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Established that PRC1 (via Rnf2) and PRC2 act non-redundantly in higher-order genome organization, each independently required for imprinted-cluster contraction and silencing, and for X-inactivation initiation.\",\n      \"evidence\": \"Conditional knockout embryos, 3D-FISH/RNA-FISH; earlier ES-cell conditional KO and Xi localization studies\",\n      \"pmids\": [\"18848501\", \"17620408\", \"15509584\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct cause of genomic contraction not mechanistically defined\", \"Relationship between H2Aub and folding unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Revealed that much of PRC1-mediated repression and early development are independent of RING1B catalytic activity, separating enzymatic from scaffolding/targeting functions.\",\n      \"evidence\": \"Catalytic-dead RING1B knockin mouse, ChIP-seq, transcriptomics\",\n      \"pmids\": [\"26385961\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which functions strictly require catalysis not enumerated\", \"Compensatory mechanisms not defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined a non-canonical genome-protective role, showing RNF2/BMI1 suppress R-loops, transcription–replication conflicts, and fragile-site instability to sustain replication-fork progression.\",\n      \"evidence\": \"DNA fiber assays, proximity ligation, ChIP, CRISPR-KO, FANCD2/FANCI epistasis, RNaseH rescue (multiple studies)\",\n      \"pmids\": [\"30413623\", \"32142505\", \"26272920\", \"29985131\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How H2AK119ub mechanistically resolves R-loops unclear\", \"Tissue/cell-type generality not fully mapped\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Extended RNF2 beyond chromatin to immune signaling, showing nuclear RNF2 adds K33-linked ubiquitin to STAT1 at K379 to evict STAT1/STAT2 from DNA and suppress interferon-stimulated genes.\",\n      \"evidence\": \"E3 ligase screen, Co-IP, K379R mutagenesis, in vitro ubiquitination, ChIP, conditional KO\",\n      \"pmids\": [\"29242538\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream signals localizing RNF2 to STAT1 unknown\", \"Whether PRC1 partners participate not addressed\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated non-histone proteasomal substrate ubiquitination by RNF2, exemplified by WASH-recruited AMBRA1 K48 ubiquitination that downregulates autophagy.\",\n      \"evidence\": \"Co-IP, in vitro ubiquitination, K45 mutagenesis, autophagy flux, RNF2/WASH depletion\",\n      \"pmids\": [\"24980959\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of substrate selection not defined\", \"Relationship to PRC1 assembly unclear\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showed RNF2 drives cancer phenotypes through catalysis-dependent and catalysis-independent routes, with MEK1 phosphorylation recruiting UTX/p300 for transcriptional activation versus H2AK119ub-mediated silencing.\",\n      \"evidence\": \"Catalytic-dead mutant, ChIP-seq, MEK1 phosphorylation assay, melanoma models; supported by phospho-site and O-GlcNAc mapping\",\n      \"pmids\": [\"26450788\", \"19405034\", \"26100231\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Switch between activator and repressor modes incompletely defined\", \"Generality of activation function across loci unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Linked RNF2 to human disease, identifying de novo p.R70H and p.S82R variants in a neurodevelopmental disorder that act as loss-of-function alleles disrupting BMI1 or H2A interfaces.\",\n      \"evidence\": \"Structural analysis of variant positions and Drosophila in vivo functional assays\",\n      \"pmids\": [\"33864376\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Interface disruption inferred from structure, not co-crystals of variants\", \"Mammalian phenotypic modeling limited\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How RNF2 selects between its many non-histone substrates (p53, SIK1, IRF4, RASSF10, GATA4) and how its diverse post-translational modifications and partner switches are coordinated in vivo to dictate chromatin versus non-chromatin output remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model of substrate choice\", \"Spatiotemporal control of catalytic vs scaffold roles undefined\", \"Many non-histone substrates rest on single-lab Co-IP/ubiquitination data\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [0, 1, 2, 3, 4, 15, 17, 19, 32, 33, 35, 41]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 2, 15, 17, 19, 20]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [0, 1, 20]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [14, 25, 34]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [7, 8, 19, 31]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [7, 14, 24, 31]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [0, 8, 11, 23]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [6, 14, 19, 34]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [21, 22, 39]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [24]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [3, 4, 15, 17, 32, 33]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [6, 9, 36]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [19]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [15, 35]}\n    ],\n    \"complexes\": [\"PRC1\", \"FBXL10-RNF68-RNF2 (FRRUC)\", \"Ring1B-Fbxl10-BcoR complex\"],\n    \"partners\": [\"BMI1\", \"RYBP\", \"CBX\", \"USP7\", \"UBE3A\", \"MDM2\", \"STAT1\", \"FBXL10\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":8,"faith_pct":87.5}}