{"gene":"ELOB","run_date":"2026-06-09T23:54:43","timeline":{"discoveries":[{"year":2023,"finding":"Cryo-EM structures of human Elongin (ELOA-ELOB-ELOC) bound to transcribing RNA polymerase II show that ELOB-ELOC form a heterodimer anchored to ELOA, which binds the RPB2 side of Pol II; ELOA contains a 'latch' that contacts the Pol II bridge helix/funnel region to allosterically regulate the polymerase active center, and this latch is required for elongation-stimulatory activity but not for Pol II binding.","method":"Cryo-EM structure determination with functional validation (latch mutants tested for elongation stimulation and Pol II binding)","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure with multiple orthogonal functional validations (mutagenesis, elongation assays) in a single rigorous study","pmids":["37932450"],"is_preprint":false},{"year":2011,"finding":"HIV-1 Vif recruits CBF-β to an E3 ubiquitin ligase complex containing CUL5, ELOB, ELOC, and RBX2; reconstitution of the six-protein complex (Vif-CBF-β-CUL5-ELOB-ELOC-RBX2) elicits specific polyubiquitination of APOBEC3G but not APOBEC3A. CBF-β knockdown prevents Vif-mediated APOBEC3G degradation.","method":"Affinity tag/purification mass spectrometry, recombinant protein reconstitution, in vitro ubiquitination assay, RNA knockdown and genetic complementation","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with polyubiquitination assay, replicated across multiple orthogonal methods in one study","pmids":["22190037"],"is_preprint":false},{"year":2014,"finding":"Crystal structure of the Vif-CBF-β-CUL5-ELOB-ELOC pentameric complex reveals that Vif organizes the complex through two domains: an α/β domain binding CBF-β (exclusive with RUNX1 binding) and an α-domain that cooperatively interacts with ELOC and CUL5, mimicking SOCS2. A unique zinc-finger motif of Vif stabilizes the α-domain conformation important for CUL5 interaction.","method":"X-ray crystallography","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution crystal structure of the full pentameric complex with detailed structural analysis","pmids":["24402281"],"is_preprint":false},{"year":2004,"finding":"Vif targets APOBEC3G for degradation by forming an SCF-like E3 ubiquitin ligase containing CUL5, ELOB, and ELOC through a SOCS-box that binds ELOC. Serine phosphorylation in the BC-box motif negatively regulates Vif binding to ELOC. Vif autoubiquitination in the assembled Vif-CUL5 complex requires an intact SOCS-box.","method":"Co-immunoprecipitation, in vitro and in vivo ubiquitination assays, mutagenesis, phosphorylation analysis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP, in vitro/in vivo ubiquitination, mutagenesis) establishing ELOB/C as core E3 ligase components","pmids":["15574592"],"is_preprint":false},{"year":2010,"finding":"Vif binds to ELOB-ELOC at two locations via an induced-folding mechanism: the established BC-box of Vif binds ELOC, and a conserved Pro-Pro-Leu-Pro motif of Vif interacts with the C-terminal domain of ELOB. Both interactions induce structural changes in Vif's SOCS-box and ELOB-ELOC. The PPLP-ELOB interaction is necessary for functional ligase complex formation.","method":"Purified protein direct binding assays, isothermal titration calorimetry, NMR spectroscopy, cell-based functional assays","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR, ITC, and cell-based assays providing structural and functional validation in one study","pmids":["20532212"],"is_preprint":false},{"year":2013,"finding":"NMR solution structure of the Vif SOCS-box bound to ELOB-ELOC reveals that Vif's SOCS-box has one α-helical domain followed by a β-sheet fold (distinct from other SOCS proteins), binds primarily to ELOC by hydrophobic interactions, and the proline-rich motif mediates a direct but weak interaction with residues 101-104 of ELOB, inducing a conformational change from unstructured to structured.","method":"NMR spectroscopy, biophysical characterization","journal":"Open biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structure with biophysical characterization, single lab but rigorous structural method","pmids":["24225024"],"is_preprint":false},{"year":2012,"finding":"CBF-β interacts directly with full-length Vif; association of Vif with ELOB-ELOC greatly increases solubility of full-length Vif; a stable Vif-CBF-β-ELOB-ELOC complex was purified and shown to bind purified CUL5. ELOB-ELOC but not CBF-β greatly enhances folding of full-length Vif in E. coli.","method":"Protein co-expression and purification, direct binding assays, solubility assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — purified complex reconstitution with direct binding validation, single lab, multiple methods","pmids":["22479405"],"is_preprint":false},{"year":2012,"finding":"CBF-β increases the affinity of CUL5 for the Vif/ELOB/ELOC complex: isothermal calorimetry shows CUL5 binds Vif(1-192)/ELOB/ELOC/CBF-β with Kd ~5 nM versus ~327 nM for Vif(95-192)/ELOB/ELOC (which cannot bind CBF-β). CBF-β prestabilizes Vif, strengthening Vif's C-terminal Zn2+-binding motif interaction with CUL5.","method":"Isothermal titration calorimetry, heat capacity analysis","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — quantitative biophysical measurement by ITC, single lab, single method","pmids":["23098073"],"is_preprint":false},{"year":2013,"finding":"ELOB positively affects CBF-β recruitment to Vif: knockdown of endogenous ELOB or overexpression of an ELOB mutant lacking the 34-residue C-terminal tail (EBΔC34) impairs the Vif-CBF-β interaction. ELOB overexpression stabilizes Vif/VifΔSLQ/VifΔPPL through a region between residues 9 and 14 of ELOB.","method":"siRNA knockdown, co-immunoprecipitation, mutant overexpression, E. coli co-expression","journal":"Retrovirology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal knockdown and overexpression experiments with Co-IP, single lab","pmids":["23988114"],"is_preprint":false},{"year":2020,"finding":"ELOB (as a PRC2-associated subunit) is enriched at lineage specifier gene promoters during the G1 phase of the cell cycle in mouse embryonic stem cells, while PRC2 catalytic subunits (Ezh2, Jarid2) are enriched during S/G2 phases. This differential recruitment across cell cycle is linked to changes in RNA synthesis and RNA polymerase II binding.","method":"ChIP-seq, cell cycle synchronization, live-cell imaging, transcriptional analysis","journal":"Science advances","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq with cell cycle synchronization demonstrating functional differential recruitment, single lab","pmids":["32181346"],"is_preprint":false},{"year":2020,"finding":"Cryo-EM structure of ASB9-ELOB-ELOC bound to substrate (creatine kinase) and CUL5-RBX2 reveals that ELOB-ELOC acts as a hinge between ASB9 and CUL5, transmitting long-range allosteric crosstalk from the substrate through CUL5 to RBX2. HDX-MS confirms ELOB-ELOC provides conformational flexibility while ASB9 and CUL5 behave as rigid rods.","method":"Cryo-EM, hydrogen-deuterium exchange mass spectrometry (HDX-MS)","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure combined with HDX-MS for allosteric mechanism, rigorous multi-method study","pmids":["32513959"],"is_preprint":false},{"year":2014,"finding":"BIV Vif recruits ELOB-ELOC together with CUL2 and RBX1 (not CUL5 or CBF-β) to form a CRL2 E3 ubiquitin ligase complex; siRNA knockdown of ELOB inhibits BIV Vif-mediated degradation of bovine APOBEC3 proteins. BC-box mutation in BIV Vif (SLQ-AAA) abolishes ELOB-ELOC interaction and A3 degradation.","method":"Co-immunoprecipitation, siRNA knockdown, mutagenesis, ubiquitination assays","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, knockdown, and mutagenesis establishing ELOB role, single lab","pmids":["25142583"],"is_preprint":false},{"year":2014,"finding":"MVV Vif also recruits ELOB-ELOC (together with CUL5) in a CBF-β-independent manner to degrade ovine APOBEC3Z2-Z3; BC-box mutations in MVV Vif disrupt ELOB-ELOC binding and abolish A3 degradation.","method":"Co-immunoprecipitation, mutagenesis, dominant-negative mutants","journal":"Retrovirology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and mutagenesis confirming ELOB-ELOC requirement, single lab","pmids":["25213124"],"is_preprint":false},{"year":2007,"finding":"Adenoviral protein Gam1 recruits SAE1/SAE2 (SUMO E1) into CUL2/5-ELOB-ELOC-ROC1 ubiquitin ligase complexes via its SOCS domain, leading to SAE1 ubiquitylation and degradation; this inactivates sumoylation. ELOB is thus a component of Gam1-recruited CUL-RING ligases mediating viral antagonism of SUMO pathway.","method":"Co-immunoprecipitation, in vitro and in vivo ubiquitination assays, knockdown/rescue","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ubiquitination assays demonstrating ELOB-containing complex recruitment, single lab","pmids":["17392274"],"is_preprint":false},{"year":2021,"finding":"ELOB is a component of the CUL2-RBX1-ELOB E3 ligase (CRL2Prame) complex that mediates ubiquitination and proteasomal degradation of p14/ARF. Immunoprecipitation and in vivo ubiquitination assays established Cullin2-RBX1-ELOB assembly, with Prame as the substrate receptor recognizing p14/ARF.","method":"Co-immunoprecipitation, in vivo ubiquitination assay, siRNA knockdown","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ubiquitination assays, single lab, multiple methods","pmids":["33504946"],"is_preprint":false},{"year":2024,"finding":"ELOB, as the core element of the CUL2-RBX1-ELOB E3 ligase (CRL2) complex, regulates ubiquitination and proteasomal degradation of p14/ARF in breast cancer cells; ELOB knockdown suppresses proliferation, rescued by simultaneous p14/ARF knockdown.","method":"Co-immunoprecipitation, in vivo ubiquitination assay, siRNA knockdown, in vivo xenograft","journal":"Cell biology and toxicology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ubiquitination assay, epistasis rescue experiment, single lab","pmids":["38653919"],"is_preprint":false},{"year":2023,"finding":"ELOB (as part of the Elongin BC heterodimer) negatively regulates AXL receptor tyrosine kinase expression in melanoma; CRISPR screen, followed by functional validation, shows ELOB interacts with AXL through ELOB directly, contributing to proteasomal AXL turnover. This regulation is independent of hypoxia/VHL.","method":"FACS-based whole-genome CRISPR-Cas9 screen, Co-immunoprecipitation, proteasome inhibition assays","journal":"Molecular cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide screen with orthogonal Co-IP validation, single lab","pmids":["36753617"],"is_preprint":false},{"year":2018,"finding":"ANKRD9 forms a CUL5-ELOB-ELOC-RNF7 cullin-RING E3 ligase complex (not CUL2) and functions as its substrate receptor. This complex ubiquitinates IMPDH isoforms (IMPDH1 and IMPDH2) for proteasomal degradation; ubiquitination requires ANKRD9 presence.","method":"Quantitative proteomics, Co-IP, complex reconstitution, in vitro ubiquitination assay","journal":"Biochimica et biophysica acta. Molecular basis of disease","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — complex reconstitution and in vitro ubiquitination assay with proteomics, single lab","pmids":["30293565"],"is_preprint":false},{"year":2024,"finding":"ASB1 interacts with ELOB to assemble an E3 ubiquitin ligase complex that promotes K48-linked ubiquitination of sulfide-quinone oxidoreductase (SQOR) at residues K207 and K344, triggering proteasomal degradation and controlling H2S homeostasis during spermiogenesis.","method":"Co-immunoprecipitation, in vivo ubiquitination assay, Asb1 knockout mouse model, site-directed mutagenesis","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with ubiquitination site mapping and KO mouse phenotype, single lab","pmids":["39733518"],"is_preprint":false},{"year":2024,"finding":"ZSWIM4 interacts with ELOB and ELOC (identified by SILAC proteomics) and forms a CUL2-RING ubiquitin ligase complex with ELOB-ELOC to promote ubiquitination and nuclear degradation of SMAD1, attenuating BMP signaling during Xenopus embryonic patterning.","method":"SILAC proteomics, Co-immunoprecipitation, in vivo ubiquitination assay, Xenopus loss-of-function/gain-of-function","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — SILAC identification plus Co-IP and ubiquitination assay with developmental functional validation, single lab","pmids":["38177922"],"is_preprint":false},{"year":2023,"finding":"TULP4 forms a novel E3 ubiquitin ligase through interaction with CUL5-ELOB-ELOC-RNF7 complex; schizophrenia-associated TULP4 variants affect binding of TULP4 to CUL5. Tulp4 knockdown delays neuronal migration in mice.","method":"Co-immunoprecipitation, whole-exome sequencing, in utero knockdown, behavioral assays","journal":"CNS neuroscience & therapeutics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP experiment for complex characterization, functional data is neuronal migration phenotype without direct ubiquitination substrate identification","pmids":["37650344"],"is_preprint":false},{"year":2023,"finding":"USP51 directly binds ELOC and forms a larger complex with the VHL E3 ligase (USP51/VHL/CUL2/ELOB/ELOC/RBX1); within this complex USP51 deubiquitinates HIF1A to stabilize it. SUMOylation of ELOC at K32 inhibits USP51 binding, while SENP1-mediated deSUMOylation of ELOC promotes USP51 association.","method":"Co-immunoprecipitation, in vivo deubiquitination assay, SUMOylation assay, siRNA knockdown","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with ubiquitination/SUMOylation assays and epistasis, single lab","pmids":["37816999"],"is_preprint":false},{"year":2023,"finding":"Cryo-EM structure of HIV-1 Vif in complex with APOBEC3H, CBF-β, CUL5, ELOB, and ELOC reveals that Vif nucleates the complex by directly binding all four human proteins; ELOB-ELOC serve as adaptor components within this structural assembly.","method":"Cryo-EM structure determination, functional mutagenesis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure with mutagenesis confirming ELOB-ELOC role as adaptor components in the complex","pmids":["37640699"],"is_preprint":false},{"year":2025,"finding":"Cryo-EM structure (3.6 Å) of chimpanzee APOBEC3H-Vif-CBF-β-ELOB-ELOC complex demonstrates that ELOB and ELOC are integral structural components of the CUL5 E3 ligase complex; ubiquitination by this complex occurs specifically at two lysine residues on the Vif-proximal A3H protomer.","method":"Cryo-EM structure determination, in vitro ubiquitination assay with site mapping","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution cryo-EM with functional ubiquitination site mapping in a single rigorous study","pmids":["40593686"],"is_preprint":false},{"year":2023,"finding":"A peptide mimicking the BC-box of EPOP (PRC2-associated protein) binds ELOB-ELOC with sub-nanomolar affinity (Kd = 0.46 nM) and blocks ELOB-ELOC association with BC-box-containing interaction partners both in vitro and in cells, inducing apoptosis in cancer cells and perturbing gene expression.","method":"In vitro binding assay (fluorescence polarization/ITC), cellular co-immunoprecipitation displacement, viability/apoptosis assays, RNA-seq","journal":"Cell chemical biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro binding with cellular functional validation, single lab, multiple orthogonal methods","pmids":["37354906"],"is_preprint":false},{"year":2025,"finding":"Rotavirus NSP1 contains a BC-box motif that mediates interaction with the Elongin BC complex (ELOB-ELOC); CRISPR knockout or siRNA knockdown of TCEB2 (ELOB) substantially prevents NSP1-mediated IRF3 degradation. Elongin BC also stabilizes other viral BC-box-containing innate immune antagonists (pestiviral N proteases, adenovirus E4orf6), functioning not only as ubiquitin ligase adaptor but as a stabilizing factor for viral proteins.","method":"CRISPR knockout, siRNA knockdown, recombinant virus BC-box mutagenesis, IRF3 degradation assay, interferon response measurement","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — CRISPR KO and siRNA knockdown with multiple viral systems and in vitro/in vivo validation, replicated across multiple viruses","pmids":["42234532"],"is_preprint":false},{"year":2018,"finding":"JDV Vif recruits ELOB-ELOC (together with CUL2 and RBX1, not CBF-β) via a BC-box motif (T149LQ151) to form an E3 ubiquitin ligase that degrades bovine APOBEC3 proteins.","method":"Co-immunoprecipitation, mutagenesis, degradation assays","journal":"Virology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP with mutagenesis for ELOB interaction, single lab","pmids":["29653302"],"is_preprint":false},{"year":2016,"finding":"The C-terminal cytoplasmic tail of Patched1 (Ptc1 ICD7) interacts with components of a CUL2-based E3 ligase complex including TCEB2 (ELOB), TCEB1 (ELOC), ZYG11B, and CUL2, identified by mass spectrometry; CUL2 knockdown abolishes Shh-induced osteoblast differentiation.","method":"Mass spectrometry identification, co-immunoprecipitation, CUL2 knockdown","journal":"Molecular and cellular biochemistry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — MS identification with Co-IP, functional link is to CUL2 knockdown not directly ELOB, single lab","pmids":["26885983"],"is_preprint":false},{"year":2015,"finding":"TCEB2 (ELOB) plays a role in HIF-1α degradation; TCEB2 overexpression promotes HIF-1α degradation and suppresses VEGF-A expression in ovarian cancer cells. TCEB2-overexpressing cells elevate IL-8 as a compensatory angiogenesis signal.","method":"Overexpression in xenograft models, gene expression analysis, Western blot","journal":"Oncology reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — overexpression study with indirect functional readout on HIF-1α, no direct ubiquitination assay, single lab","pmids":["26531153"],"is_preprint":false},{"year":2024,"finding":"TCEB2 mediates Slit2 K63-linked ubiquitination degradation in TNBC by interacting with NEDD4 (via Co-IP); TCEB2 knockdown reduces TNBC cell growth, migration, invasion, and M2 macrophage polarization, which is rescued by Slit2 knockdown.","method":"Co-immunoprecipitation, ubiquitin-based IP assay, siRNA knockdown, in vivo xenograft","journal":"Translational oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP and ubiquitination assay with epistasis rescue, single lab","pmids":["41014880"],"is_preprint":false},{"year":2024,"finding":"ASB9 assembles a testis-specific CRL complex (TNP2-ASB9-ELOB-ELOC-CUL5-RBX1) that mediates ubiquitin-dependent degradation of TNP2 to facilitate histone-to-protamine transition; ASB9 deficiency in mice causes TNP2 retention and male infertility.","method":"Co-immunoprecipitation, in vivo ubiquitination assay, ASB9 knockout mouse model","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with ubiquitination assay and KO mouse phenotype, single lab, multiple methods","pmids":["41915740"],"is_preprint":false},{"year":2026,"finding":"ELOB knockout inhibits diffuse midline glioma (DMG) cell proliferation in vitro and tumor growth in xenograft models; ELOB binding sites are enriched in H3K27M oncohistone-containing genomic regions, and ELOB KO alters H3K27me3/H3K27M incorporation at thousands of loci and disrupts Pol2 transcriptional activity.","method":"CRISPR screen and KO, PRO-seq, RNA-seq, ChIP-seq, xenograft models","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR KO with genomic and transcriptional profiling plus xenograft, preprint, single lab","pmids":["42239282"],"is_preprint":true}],"current_model":"ELOB (Elongin B / TCEB2) functions as a constitutive subunit of the ELOB-ELOC heterodimer that serves two major roles: (1) as a structural adaptor within CUL2- and CUL5-containing RING E3 ubiquitin ligase complexes, connecting SOCS-box substrate receptors (e.g., VHL, ASB proteins, viral Vif) to cullin scaffolds and thereby enabling ubiquitination and proteasomal degradation of diverse substrates (APOBEC3 proteins, HIF-1α, SMAD1, IMPDH, p14/ARF, AXL); and (2) as a component of the trimeric Elongin (SIII) complex that stimulates RNA polymerase II transcription elongation through an allosteric mechanism, with ELOB-ELOC anchored to ELOA which contacts the Pol II active center via a latch element."},"narrative":{"mechanistic_narrative":"ELOB (Elongin B / TCEB2) operates as a constitutive subunit of the ELOB-ELOC heterodimer that serves two distinct cellular functions: structural adaptation within cullin-RING E3 ubiquitin ligases and stimulation of RNA polymerase II transcription elongation [PMID:37932450, PMID:15574592]. As an elongation factor, ELOB-ELOC anchors to ELOA, which binds the RPB2 side of transcribing Pol II and inserts a 'latch' element into the bridge-helix/funnel region of the active center to allosterically stimulate elongation [PMID:37932450]. As a ligase adaptor, the ELOB-ELOC heterodimer bridges BC-box/SOCS-box substrate receptors to CUL2 or CUL5 scaffolds, enabling assembly of CRL2 and CRL5 complexes that ubiquitinate diverse substrates; structural and HDX-MS analyses show ELOB-ELOC functions as a flexible hinge that transmits long-range allosteric crosstalk from substrate receptor through cullin to the catalytic RING subunit [PMID:32513959]. Through this adaptor role, ELOB supports degradation of substrates including p14/ARF via the CRL2-PRAME complex [PMID:33504946, PMID:38653919], IMPDH isoforms via ANKRD9-CUL5 [PMID:30293565], SMAD1 via ZSWIM4-CUL2 to attenuate BMP signaling [PMID:38177922], SQOR via ASB1 in spermiogenesis [PMID:39733518], and TNP2 via ASB9 during the histone-to-protamine transition [PMID:41915740]. Viral proteins exploit this machinery: HIV-1 Vif recruits CBF-β, CUL5, ELOB, ELOC, and RBX2 to ubiquitinate APOBEC3 proteins, with Vif binding ELOC through its BC-box and a Pro-Pro-Leu-Pro motif contacting the ELOB C-terminal domain via induced folding [PMID:22190037, PMID:20532212, PMID:37640699]; analogous BC-box-mediated recruitment occurs for non-primate lentiviral Vifs, adenoviral Gam1, and rotavirus NSP1, where Elongin BC additionally stabilizes the viral antagonist proteins [PMID:25142583, PMID:17392274, PMID:42234532]. ELOB also participates in chromatin-associated and elongation-coupled functions, being recruited as a PRC2-associated subunit to lineage-specifier promoters in a cell-cycle-dependent manner [PMID:32181346], and its BC-box-binding pocket can be blocked by a high-affinity EPOP-derived peptide that disrupts partner association and induces apoptosis in cancer cells [PMID:37354906].","teleology":[{"year":2004,"claim":"Establishing that ELOB-ELOC are core components of a virally co-opted SCF-like E3 ligase answered how HIV-1 Vif directs APOBEC3G to degradation, defining the SOCS-box/BC-box as the docking principle for ELOC.","evidence":"Co-IP, in vitro/in vivo ubiquitination, mutagenesis and phosphorylation analysis of the Vif-CUL5-ELOB-ELOC complex","pmids":["15574592"],"confidence":"High","gaps":["Did not provide atomic-resolution architecture of the assembled complex","Role of CBF-β not yet known"]},{"year":2007,"claim":"Demonstrating that adenoviral Gam1 recruits the SUMO E1 into ELOB-ELOC-containing CUL2/5 ligases extended the adaptor role beyond lentiviral Vif to a broader viral strategy of co-opting ELOB-based ligases.","evidence":"Co-IP, in vitro/in vivo ubiquitination, knockdown/rescue in cells","pmids":["17392274"],"confidence":"Medium","gaps":["No structural characterization of the Gam1-ELOB-ELOC interface"]},{"year":2010,"claim":"Resolving that Vif binds ELOB-ELOC at two sites by induced folding—BC-box to ELOC and a PPLP motif to the ELOB C-terminus—revealed ELOB as an active, conformation-determining partner rather than a passive scaffold.","evidence":"Purified-protein binding, ITC, NMR and cell-based functional assays","pmids":["20532212","24225024"],"confidence":"High","gaps":["Did not define how these interactions position substrate relative to the catalytic RING","PPLP-ELOB interaction characterized as weak"]},{"year":2012,"claim":"Showing that CBF-β prestabilizes Vif and raises CUL5 affinity ~60-fold, with ELOB-ELOC enhancing Vif folding and solubility, clarified the assembly hierarchy and ELOB's chaperone-like contribution to complex stability.","evidence":"Protein co-expression/purification, solubility assays, ITC with heat-capacity analysis","pmids":["22479405","23098073","23988114"],"confidence":"Medium","gaps":["Single-lab biophysical measurements","Mechanism of ELOB-mediated stabilization of partner proteins not generalized beyond Vif at this stage"]},{"year":2014,"claim":"Crystallography of the Vif-CBF-β-CUL5-ELOB-ELOC pentamer showed Vif mimics SOCS2 and that ELOC/CUL5 are engaged cooperatively, providing the first complete view of how ELOB-ELOC bridge a SOCS-box receptor to a cullin.","evidence":"X-ray crystallography of the reconstituted pentameric complex","pmids":["24402281"],"confidence":"High","gaps":["Static structure did not capture catalytic dynamics or substrate engagement"]},{"year":2014,"claim":"Demonstrating that non-primate lentiviral Vifs (BIV, MVV) recruit ELOB-ELOC through BC-box motifs—with CUL2 or CUL5 and independently of CBF-β—established the universality and modularity of ELOB-ELOC adaptor usage across cullin scaffolds.","evidence":"Co-IP, siRNA knockdown, BC-box mutagenesis and degradation assays across viral systems","pmids":["25142583","25213124"],"confidence":"Medium","gaps":["No structures of these non-primate complexes","Determinants of CUL2- vs CUL5-selection not defined"]},{"year":2018,"claim":"Identifying cellular ASB9- and ANKRD9-based CRL5 complexes with defined substrates (TNP2, IMPDH) confirmed that ELOB-ELOC serve endogenous, physiologically important ligases beyond viral hijacking.","evidence":"Quantitative proteomics, complex reconstitution, in vitro/in vivo ubiquitination assays","pmids":["30293565","41915740"],"confidence":"Medium","gaps":["Substrate selectivity rules for individual ASB/receptor proteins not fully resolved"]},{"year":2020,"claim":"Cryo-EM and HDX-MS of the ASB9-ELOB-ELOC-CUL5-RBX2 complex with substrate revealed ELOB-ELOC as a flexible hinge transmitting long-range allosteric crosstalk, redefining the heterodimer as a conformational signal conduit rather than a rigid spacer.","evidence":"Cryo-EM with HDX-MS conformational analysis of the substrate-bound complex","pmids":["32513959"],"confidence":"High","gaps":["Whether this hinge behavior generalizes to all ELOB-ELOC ligases not established"]},{"year":2020,"claim":"Detecting ELOB enrichment at lineage-specifier promoters in G1 as a PRC2-associated subunit linked ELOB to cell-cycle-coupled chromatin regulation, hinting at a nuclear role distinct from its ligase function.","evidence":"ChIP-seq with cell-cycle synchronization, live-cell imaging, transcriptional analysis in mouse ESCs","pmids":["32181346"],"confidence":"Medium","gaps":["Direct biochemical mechanism connecting ELOB to PRC2 not defined","Whether recruitment is via elongation or ligase activity unclear"]},{"year":2023,"claim":"Cryo-EM of human Elongin (ELOA-ELOB-ELOC) on transcribing Pol II defined the structural basis of the second major function: an ELOA latch allosterically modulates the active center, with ELOB-ELOC anchoring ELOA to the polymerase.","evidence":"Cryo-EM with latch-mutant elongation and Pol II binding assays","pmids":["37932450"],"confidence":"High","gaps":["Specific contribution of ELOB versus ELOC to elongation stimulation not separately dissected"]},{"year":2023,"claim":"Expanding ELOB-ELOC substrates and partners (AXL, USP51-VHL-HIF1A, EPOP-binding pocket, viral antagonists) revealed both ligase-promoting and ligase-counteracting roles and identified the BC-box pocket as a druggable target.","evidence":"CRISPR screens, Co-IP, deubiquitination/SUMOylation assays, high-affinity peptide binding and RNA-seq","pmids":["36753617","37816999","37354906","37640699"],"confidence":"Medium","gaps":["How a single ELOB-ELOC pocket is partitioned among competing BC-box partners in cells unresolved","VHL-independent AXL regulation mechanism not fully mapped"]},{"year":2025,"claim":"Showing that ELOB-ELOC not only adapt ligases but also stabilize BC-box-containing viral innate-immune antagonists (rotavirus NSP1, pestiviral N-pro, adenovirus E4orf6) generalized the chaperone-like stabilizing function across viruses.","evidence":"CRISPR KO and siRNA knockdown of TCEB2, recombinant virus BC-box mutagenesis, IRF3 degradation and interferon assays","pmids":["42234532"],"confidence":"High","gaps":["Structural basis of stabilization versus ligase adaptation not distinguished"]},{"year":2026,"claim":"ELOB knockout impairing diffuse midline glioma growth with redistribution of H3K27M/H3K27me3 and disrupted Pol II transcription tied ELOB's elongation/chromatin roles to an oncogenic dependency.","evidence":"CRISPR KO, PRO-seq, RNA-seq, ChIP-seq and xenograft models (preprint)","pmids":["42239282"],"confidence":"Medium","gaps":["Preprint, single lab, not peer-reviewed","Mechanistic link between ELOB and H3K27M genomic occupancy not resolved"]},{"year":null,"claim":"How a single ELOB-ELOC heterodimer is allocated between its transcription-elongation function and dozens of competing BC-box ligase receptors—and how this partitioning is regulated across cell cycle, tissue, and disease—remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No quantitative model of ELOB-ELOC distribution among competing partners","Regulation of the elongation versus ligase pools not defined","Distinct biochemical contribution of ELOB itself (vs ELOC) to most functions not separated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,10,4]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[1,3,17]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[10,0]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[9,19]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3,1]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[1,3,10,17]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[1,22,25]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[25,1]}],"complexes":["Elongin (SIII) complex (ELOA-ELOB-ELOC)","CUL5-RBX2 cullin-RING E3 ligase (CRL5)","CUL2-RBX1 cullin-RING E3 ligase (CRL2)","Vif-CBF-β-CUL5-ELOB-ELOC-RBX2 complex"],"partners":["ELOC","ELOA","CUL5","CUL2","VIF","ASB9","ANKRD9","USP51"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q15370","full_name":"Elongin-B","aliases":["Elongin 18 kDa subunit","RNA polymerase II transcription factor SIII subunit B","SIII p18","Transcription elongation factor B polypeptide 2"],"length_aa":118,"mass_kda":13.1,"function":"SIII, also known as elongin, is a general transcription elongation factor that increases the RNA polymerase II transcription elongation past template-encoded arresting sites. Subunit A is transcriptionally active and its transcription activity is strongly enhanced by binding to the dimeric complex of the SIII regulatory subunits B and C (elongin BC complex) (PubMed:7638163). In embryonic stem cells, the elongin BC complex is recruited by EPOP to Polycomb group (PcG) target genes in order generate genomic region that display both active and repressive chromatin properties, an important feature of pluripotent stem cells (By similarity) Core component of multiple cullin-2 and cullin-5-RING E3 ubiquitin-protein ligase complexes (ECS complexes), which mediate the ubiquitination of target proteins (PubMed:10205047, PubMed:12004076, PubMed:12050673, PubMed:15590694, PubMed:26138980, PubMed:29775578, PubMed:29779948, PubMed:33268465, PubMed:37844242, PubMed:38326650, PubMed:39039081, PubMed:35512830, PubMed:39039081, PubMed:40440427). By binding to BC-box motifs it seems to link target recruitment subunits, like VHL and members of the SOCS box family, to Cullin/RBX1 modules that activate E2 ubiquitination enzymes (PubMed:10205047, PubMed:12004076, PubMed:12050673, PubMed:15590694). Component the von Hippel-Lindau ubiquitination complex CBC(VHL) (PubMed:10205047, PubMed:12004076, PubMed:12050673, PubMed:15590694). A number of ECS complexes (containing either KLHDC2, KLHDC3, KLHDC10, APPBP2, FEM1A, FEM1B or FEM1C as substrate-recognition component) are part of the DesCEND (destruction via C-end degrons) pathway, which recognizes a C-degron located at the extreme C terminus of target proteins, leading to their ubiquitination and degradation (PubMed:26138980, PubMed:29775578, PubMed:29779948, PubMed:36805027, PubMed:37844242, PubMed:38177675). The ECS(ASB9) complex mediates ubiquitination and degradation of CKB (PubMed:33268465). As part of a multisubunit ubiquitin ligase complex, polyubiquitinates monoubiquitinated POLR2A (PubMed:19920177). ECS(LRR1) ubiquitinates MCM7 and promotes CMG replisome disassembly by VCP and chromatin extraction during S-phase (By similarity). As part of the ECS(RAB40C) complex, mediates ANKRD28 ubiquitination and degradation, thereby inhibiting protein phosphatase 6 (PP6) complex activity and focal adhesion assembly during cell migration (PubMed:35512830). The ECS(ASB7) complex acts a negative regulator of H3K9me3 histone mark by mediating ubiquitination and degradation of SUV39H1 (PubMed:40440427) (Microbial infection) Following infection by HIV-1 virus, component of a cullin-5-RING E3 ubiquitin-protein ligase complex (ECS complex) hijacked by the HIV-1 Vif protein, which catalyzes ubiquitination and degradation of APOBEC3F and APOBEC3G (PubMed:18562529, PubMed:20532212, PubMed:22190037, PubMed:24225024, PubMed:24402281, PubMed:36754086). The complex can also ubiquitinate APOBEC3H to some extent (PubMed:37640699)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q15370/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/ELOB","classification":"Common Essential","n_dependent_lines":1182,"n_total_lines":1208,"dependency_fraction":0.9784768211920529},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"NRBP1","stoichiometry":10.0},{"gene":"DDB1","stoichiometry":0.2},{"gene":"DYNLL2","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/ELOB","total_profiled":1310},"omim":[{"mim_id":"620091","title":"PROTEIN-L-ISOASPARTATE (D-ASPARTATE) O-METHYLTRANSFERASE DOMAIN-CONTAINING PROTEIN 1; PCMTD1","url":"https://www.omim.org/entry/620091"},{"mim_id":"620077","title":"PROTEIN-L-ISOASPARTATE (D-ASPARTATE) O-METHYLTRANSFERASE DOMAIN-CONTAINING PROTEIN 2; PCMTD2","url":"https://www.omim.org/entry/620077"},{"mim_id":"618753","title":"LEUCINE-RICH REPEAT-CONTAINING PROTEIN 41; LRRC41","url":"https://www.omim.org/entry/618753"},{"mim_id":"617795","title":"ELONGIN BC- AND POLYCOMB REPRESSIVE COMPLEX 2-ASSOCIATED PROTEIN; EPOP","url":"https://www.omim.org/entry/617795"},{"mim_id":"617764","title":"ZYG11-RELATED CELL CYCLE REGULATOR; ZER1","url":"https://www.omim.org/entry/617764"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ELOB"},"hgnc":{"alias_symbol":["SIII"],"prev_symbol":["TCEB2"]},"alphafold":{"accession":"Q15370","domains":[{"cath_id":"3.10.20.90","chopping":"1-84","consensus_level":"high","plddt":97.8963,"start":1,"end":84}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15370","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q15370-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q15370-F1-predicted_aligned_error_v6.png","plddt_mean":92.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ELOB","jax_strain_url":"https://www.jax.org/strain/search?query=ELOB"},"sequence":{"accession":"Q15370","fasta_url":"https://rest.uniprot.org/uniprotkb/Q15370.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q15370/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15370"}},"corpus_meta":[{"pmid":"22190037","id":"PMC_22190037","title":"Vif hijacks CBF-β to degrade APOBEC3G 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ELOA contains a 'latch' that contacts the Pol II bridge helix/funnel region to allosterically regulate the polymerase active center, and this latch is required for elongation-stimulatory activity but not for Pol II binding.\",\n      \"method\": \"Cryo-EM structure determination with functional validation (latch mutants tested for elongation stimulation and Pol II binding)\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure with multiple orthogonal functional validations (mutagenesis, elongation assays) in a single rigorous study\",\n      \"pmids\": [\"37932450\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"HIV-1 Vif recruits CBF-β to an E3 ubiquitin ligase complex containing CUL5, ELOB, ELOC, and RBX2; reconstitution of the six-protein complex (Vif-CBF-β-CUL5-ELOB-ELOC-RBX2) elicits specific polyubiquitination of APOBEC3G but not APOBEC3A. CBF-β knockdown prevents Vif-mediated APOBEC3G degradation.\",\n      \"method\": \"Affinity tag/purification mass spectrometry, recombinant protein reconstitution, in vitro ubiquitination assay, RNA knockdown and genetic complementation\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with polyubiquitination assay, replicated across multiple orthogonal methods in one study\",\n      \"pmids\": [\"22190037\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Crystal structure of the Vif-CBF-β-CUL5-ELOB-ELOC pentameric complex reveals that Vif organizes the complex through two domains: an α/β domain binding CBF-β (exclusive with RUNX1 binding) and an α-domain that cooperatively interacts with ELOC and CUL5, mimicking SOCS2. A unique zinc-finger motif of Vif stabilizes the α-domain conformation important for CUL5 interaction.\",\n      \"method\": \"X-ray crystallography\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution crystal structure of the full pentameric complex with detailed structural analysis\",\n      \"pmids\": [\"24402281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Vif targets APOBEC3G for degradation by forming an SCF-like E3 ubiquitin ligase containing CUL5, ELOB, and ELOC through a SOCS-box that binds ELOC. Serine phosphorylation in the BC-box motif negatively regulates Vif binding to ELOC. Vif autoubiquitination in the assembled Vif-CUL5 complex requires an intact SOCS-box.\",\n      \"method\": \"Co-immunoprecipitation, in vitro and in vivo ubiquitination assays, mutagenesis, phosphorylation analysis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP, in vitro/in vivo ubiquitination, mutagenesis) establishing ELOB/C as core E3 ligase components\",\n      \"pmids\": [\"15574592\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Vif binds to ELOB-ELOC at two locations via an induced-folding mechanism: the established BC-box of Vif binds ELOC, and a conserved Pro-Pro-Leu-Pro motif of Vif interacts with the C-terminal domain of ELOB. Both interactions induce structural changes in Vif's SOCS-box and ELOB-ELOC. The PPLP-ELOB interaction is necessary for functional ligase complex formation.\",\n      \"method\": \"Purified protein direct binding assays, isothermal titration calorimetry, NMR spectroscopy, cell-based functional assays\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR, ITC, and cell-based assays providing structural and functional validation in one study\",\n      \"pmids\": [\"20532212\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NMR solution structure of the Vif SOCS-box bound to ELOB-ELOC reveals that Vif's SOCS-box has one α-helical domain followed by a β-sheet fold (distinct from other SOCS proteins), binds primarily to ELOC by hydrophobic interactions, and the proline-rich motif mediates a direct but weak interaction with residues 101-104 of ELOB, inducing a conformational change from unstructured to structured.\",\n      \"method\": \"NMR spectroscopy, biophysical characterization\",\n      \"journal\": \"Open biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structure with biophysical characterization, single lab but rigorous structural method\",\n      \"pmids\": [\"24225024\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CBF-β interacts directly with full-length Vif; association of Vif with ELOB-ELOC greatly increases solubility of full-length Vif; a stable Vif-CBF-β-ELOB-ELOC complex was purified and shown to bind purified CUL5. ELOB-ELOC but not CBF-β greatly enhances folding of full-length Vif in E. coli.\",\n      \"method\": \"Protein co-expression and purification, direct binding assays, solubility assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — purified complex reconstitution with direct binding validation, single lab, multiple methods\",\n      \"pmids\": [\"22479405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CBF-β increases the affinity of CUL5 for the Vif/ELOB/ELOC complex: isothermal calorimetry shows CUL5 binds Vif(1-192)/ELOB/ELOC/CBF-β with Kd ~5 nM versus ~327 nM for Vif(95-192)/ELOB/ELOC (which cannot bind CBF-β). CBF-β prestabilizes Vif, strengthening Vif's C-terminal Zn2+-binding motif interaction with CUL5.\",\n      \"method\": \"Isothermal titration calorimetry, heat capacity analysis\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — quantitative biophysical measurement by ITC, single lab, single method\",\n      \"pmids\": [\"23098073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ELOB positively affects CBF-β recruitment to Vif: knockdown of endogenous ELOB or overexpression of an ELOB mutant lacking the 34-residue C-terminal tail (EBΔC34) impairs the Vif-CBF-β interaction. ELOB overexpression stabilizes Vif/VifΔSLQ/VifΔPPL through a region between residues 9 and 14 of ELOB.\",\n      \"method\": \"siRNA knockdown, co-immunoprecipitation, mutant overexpression, E. coli co-expression\",\n      \"journal\": \"Retrovirology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal knockdown and overexpression experiments with Co-IP, single lab\",\n      \"pmids\": [\"23988114\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ELOB (as a PRC2-associated subunit) is enriched at lineage specifier gene promoters during the G1 phase of the cell cycle in mouse embryonic stem cells, while PRC2 catalytic subunits (Ezh2, Jarid2) are enriched during S/G2 phases. This differential recruitment across cell cycle is linked to changes in RNA synthesis and RNA polymerase II binding.\",\n      \"method\": \"ChIP-seq, cell cycle synchronization, live-cell imaging, transcriptional analysis\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq with cell cycle synchronization demonstrating functional differential recruitment, single lab\",\n      \"pmids\": [\"32181346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Cryo-EM structure of ASB9-ELOB-ELOC bound to substrate (creatine kinase) and CUL5-RBX2 reveals that ELOB-ELOC acts as a hinge between ASB9 and CUL5, transmitting long-range allosteric crosstalk from the substrate through CUL5 to RBX2. HDX-MS confirms ELOB-ELOC provides conformational flexibility while ASB9 and CUL5 behave as rigid rods.\",\n      \"method\": \"Cryo-EM, hydrogen-deuterium exchange mass spectrometry (HDX-MS)\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure combined with HDX-MS for allosteric mechanism, rigorous multi-method study\",\n      \"pmids\": [\"32513959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"BIV Vif recruits ELOB-ELOC together with CUL2 and RBX1 (not CUL5 or CBF-β) to form a CRL2 E3 ubiquitin ligase complex; siRNA knockdown of ELOB inhibits BIV Vif-mediated degradation of bovine APOBEC3 proteins. BC-box mutation in BIV Vif (SLQ-AAA) abolishes ELOB-ELOC interaction and A3 degradation.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, mutagenesis, ubiquitination assays\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, knockdown, and mutagenesis establishing ELOB role, single lab\",\n      \"pmids\": [\"25142583\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MVV Vif also recruits ELOB-ELOC (together with CUL5) in a CBF-β-independent manner to degrade ovine APOBEC3Z2-Z3; BC-box mutations in MVV Vif disrupt ELOB-ELOC binding and abolish A3 degradation.\",\n      \"method\": \"Co-immunoprecipitation, mutagenesis, dominant-negative mutants\",\n      \"journal\": \"Retrovirology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and mutagenesis confirming ELOB-ELOC requirement, single lab\",\n      \"pmids\": [\"25213124\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Adenoviral protein Gam1 recruits SAE1/SAE2 (SUMO E1) into CUL2/5-ELOB-ELOC-ROC1 ubiquitin ligase complexes via its SOCS domain, leading to SAE1 ubiquitylation and degradation; this inactivates sumoylation. ELOB is thus a component of Gam1-recruited CUL-RING ligases mediating viral antagonism of SUMO pathway.\",\n      \"method\": \"Co-immunoprecipitation, in vitro and in vivo ubiquitination assays, knockdown/rescue\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ubiquitination assays demonstrating ELOB-containing complex recruitment, single lab\",\n      \"pmids\": [\"17392274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ELOB is a component of the CUL2-RBX1-ELOB E3 ligase (CRL2Prame) complex that mediates ubiquitination and proteasomal degradation of p14/ARF. Immunoprecipitation and in vivo ubiquitination assays established Cullin2-RBX1-ELOB assembly, with Prame as the substrate receptor recognizing p14/ARF.\",\n      \"method\": \"Co-immunoprecipitation, in vivo ubiquitination assay, siRNA knockdown\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ubiquitination assays, single lab, multiple methods\",\n      \"pmids\": [\"33504946\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ELOB, as the core element of the CUL2-RBX1-ELOB E3 ligase (CRL2) complex, regulates ubiquitination and proteasomal degradation of p14/ARF in breast cancer cells; ELOB knockdown suppresses proliferation, rescued by simultaneous p14/ARF knockdown.\",\n      \"method\": \"Co-immunoprecipitation, in vivo ubiquitination assay, siRNA knockdown, in vivo xenograft\",\n      \"journal\": \"Cell biology and toxicology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ubiquitination assay, epistasis rescue experiment, single lab\",\n      \"pmids\": [\"38653919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ELOB (as part of the Elongin BC heterodimer) negatively regulates AXL receptor tyrosine kinase expression in melanoma; CRISPR screen, followed by functional validation, shows ELOB interacts with AXL through ELOB directly, contributing to proteasomal AXL turnover. This regulation is independent of hypoxia/VHL.\",\n      \"method\": \"FACS-based whole-genome CRISPR-Cas9 screen, Co-immunoprecipitation, proteasome inhibition assays\",\n      \"journal\": \"Molecular cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide screen with orthogonal Co-IP validation, single lab\",\n      \"pmids\": [\"36753617\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ANKRD9 forms a CUL5-ELOB-ELOC-RNF7 cullin-RING E3 ligase complex (not CUL2) and functions as its substrate receptor. This complex ubiquitinates IMPDH isoforms (IMPDH1 and IMPDH2) for proteasomal degradation; ubiquitination requires ANKRD9 presence.\",\n      \"method\": \"Quantitative proteomics, Co-IP, complex reconstitution, in vitro ubiquitination assay\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular basis of disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — complex reconstitution and in vitro ubiquitination assay with proteomics, single lab\",\n      \"pmids\": [\"30293565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ASB1 interacts with ELOB to assemble an E3 ubiquitin ligase complex that promotes K48-linked ubiquitination of sulfide-quinone oxidoreductase (SQOR) at residues K207 and K344, triggering proteasomal degradation and controlling H2S homeostasis during spermiogenesis.\",\n      \"method\": \"Co-immunoprecipitation, in vivo ubiquitination assay, Asb1 knockout mouse model, site-directed mutagenesis\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with ubiquitination site mapping and KO mouse phenotype, single lab\",\n      \"pmids\": [\"39733518\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ZSWIM4 interacts with ELOB and ELOC (identified by SILAC proteomics) and forms a CUL2-RING ubiquitin ligase complex with ELOB-ELOC to promote ubiquitination and nuclear degradation of SMAD1, attenuating BMP signaling during Xenopus embryonic patterning.\",\n      \"method\": \"SILAC proteomics, Co-immunoprecipitation, in vivo ubiquitination assay, Xenopus loss-of-function/gain-of-function\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — SILAC identification plus Co-IP and ubiquitination assay with developmental functional validation, single lab\",\n      \"pmids\": [\"38177922\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TULP4 forms a novel E3 ubiquitin ligase through interaction with CUL5-ELOB-ELOC-RNF7 complex; schizophrenia-associated TULP4 variants affect binding of TULP4 to CUL5. Tulp4 knockdown delays neuronal migration in mice.\",\n      \"method\": \"Co-immunoprecipitation, whole-exome sequencing, in utero knockdown, behavioral assays\",\n      \"journal\": \"CNS neuroscience & therapeutics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP experiment for complex characterization, functional data is neuronal migration phenotype without direct ubiquitination substrate identification\",\n      \"pmids\": [\"37650344\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"USP51 directly binds ELOC and forms a larger complex with the VHL E3 ligase (USP51/VHL/CUL2/ELOB/ELOC/RBX1); within this complex USP51 deubiquitinates HIF1A to stabilize it. SUMOylation of ELOC at K32 inhibits USP51 binding, while SENP1-mediated deSUMOylation of ELOC promotes USP51 association.\",\n      \"method\": \"Co-immunoprecipitation, in vivo deubiquitination assay, SUMOylation assay, siRNA knockdown\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with ubiquitination/SUMOylation assays and epistasis, single lab\",\n      \"pmids\": [\"37816999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Cryo-EM structure of HIV-1 Vif in complex with APOBEC3H, CBF-β, CUL5, ELOB, and ELOC reveals that Vif nucleates the complex by directly binding all four human proteins; ELOB-ELOC serve as adaptor components within this structural assembly.\",\n      \"method\": \"Cryo-EM structure determination, functional mutagenesis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure with mutagenesis confirming ELOB-ELOC role as adaptor components in the complex\",\n      \"pmids\": [\"37640699\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Cryo-EM structure (3.6 Å) of chimpanzee APOBEC3H-Vif-CBF-β-ELOB-ELOC complex demonstrates that ELOB and ELOC are integral structural components of the CUL5 E3 ligase complex; ubiquitination by this complex occurs specifically at two lysine residues on the Vif-proximal A3H protomer.\",\n      \"method\": \"Cryo-EM structure determination, in vitro ubiquitination assay with site mapping\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution cryo-EM with functional ubiquitination site mapping in a single rigorous study\",\n      \"pmids\": [\"40593686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A peptide mimicking the BC-box of EPOP (PRC2-associated protein) binds ELOB-ELOC with sub-nanomolar affinity (Kd = 0.46 nM) and blocks ELOB-ELOC association with BC-box-containing interaction partners both in vitro and in cells, inducing apoptosis in cancer cells and perturbing gene expression.\",\n      \"method\": \"In vitro binding assay (fluorescence polarization/ITC), cellular co-immunoprecipitation displacement, viability/apoptosis assays, RNA-seq\",\n      \"journal\": \"Cell chemical biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro binding with cellular functional validation, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"37354906\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Rotavirus NSP1 contains a BC-box motif that mediates interaction with the Elongin BC complex (ELOB-ELOC); CRISPR knockout or siRNA knockdown of TCEB2 (ELOB) substantially prevents NSP1-mediated IRF3 degradation. Elongin BC also stabilizes other viral BC-box-containing innate immune antagonists (pestiviral N proteases, adenovirus E4orf6), functioning not only as ubiquitin ligase adaptor but as a stabilizing factor for viral proteins.\",\n      \"method\": \"CRISPR knockout, siRNA knockdown, recombinant virus BC-box mutagenesis, IRF3 degradation assay, interferon response measurement\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CRISPR KO and siRNA knockdown with multiple viral systems and in vitro/in vivo validation, replicated across multiple viruses\",\n      \"pmids\": [\"42234532\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"JDV Vif recruits ELOB-ELOC (together with CUL2 and RBX1, not CBF-β) via a BC-box motif (T149LQ151) to form an E3 ubiquitin ligase that degrades bovine APOBEC3 proteins.\",\n      \"method\": \"Co-immunoprecipitation, mutagenesis, degradation assays\",\n      \"journal\": \"Virology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP with mutagenesis for ELOB interaction, single lab\",\n      \"pmids\": [\"29653302\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The C-terminal cytoplasmic tail of Patched1 (Ptc1 ICD7) interacts with components of a CUL2-based E3 ligase complex including TCEB2 (ELOB), TCEB1 (ELOC), ZYG11B, and CUL2, identified by mass spectrometry; CUL2 knockdown abolishes Shh-induced osteoblast differentiation.\",\n      \"method\": \"Mass spectrometry identification, co-immunoprecipitation, CUL2 knockdown\",\n      \"journal\": \"Molecular and cellular biochemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — MS identification with Co-IP, functional link is to CUL2 knockdown not directly ELOB, single lab\",\n      \"pmids\": [\"26885983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TCEB2 (ELOB) plays a role in HIF-1α degradation; TCEB2 overexpression promotes HIF-1α degradation and suppresses VEGF-A expression in ovarian cancer cells. TCEB2-overexpressing cells elevate IL-8 as a compensatory angiogenesis signal.\",\n      \"method\": \"Overexpression in xenograft models, gene expression analysis, Western blot\",\n      \"journal\": \"Oncology reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — overexpression study with indirect functional readout on HIF-1α, no direct ubiquitination assay, single lab\",\n      \"pmids\": [\"26531153\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TCEB2 mediates Slit2 K63-linked ubiquitination degradation in TNBC by interacting with NEDD4 (via Co-IP); TCEB2 knockdown reduces TNBC cell growth, migration, invasion, and M2 macrophage polarization, which is rescued by Slit2 knockdown.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitin-based IP assay, siRNA knockdown, in vivo xenograft\",\n      \"journal\": \"Translational oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP and ubiquitination assay with epistasis rescue, single lab\",\n      \"pmids\": [\"41014880\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ASB9 assembles a testis-specific CRL complex (TNP2-ASB9-ELOB-ELOC-CUL5-RBX1) that mediates ubiquitin-dependent degradation of TNP2 to facilitate histone-to-protamine transition; ASB9 deficiency in mice causes TNP2 retention and male infertility.\",\n      \"method\": \"Co-immunoprecipitation, in vivo ubiquitination assay, ASB9 knockout mouse model\",\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 with ubiquitination assay and KO mouse phenotype, single lab, multiple methods\",\n      \"pmids\": [\"41915740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"ELOB knockout inhibits diffuse midline glioma (DMG) cell proliferation in vitro and tumor growth in xenograft models; ELOB binding sites are enriched in H3K27M oncohistone-containing genomic regions, and ELOB KO alters H3K27me3/H3K27M incorporation at thousands of loci and disrupts Pol2 transcriptional activity.\",\n      \"method\": \"CRISPR screen and KO, PRO-seq, RNA-seq, ChIP-seq, xenograft models\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO with genomic and transcriptional profiling plus xenograft, preprint, single lab\",\n      \"pmids\": [\"42239282\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"ELOB (Elongin B / TCEB2) functions as a constitutive subunit of the ELOB-ELOC heterodimer that serves two major roles: (1) as a structural adaptor within CUL2- and CUL5-containing RING E3 ubiquitin ligase complexes, connecting SOCS-box substrate receptors (e.g., VHL, ASB proteins, viral Vif) to cullin scaffolds and thereby enabling ubiquitination and proteasomal degradation of diverse substrates (APOBEC3 proteins, HIF-1α, SMAD1, IMPDH, p14/ARF, AXL); and (2) as a component of the trimeric Elongin (SIII) complex that stimulates RNA polymerase II transcription elongation through an allosteric mechanism, with ELOB-ELOC anchored to ELOA which contacts the Pol II active center via a latch element.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ELOB (Elongin B / TCEB2) operates as a constitutive subunit of the ELOB-ELOC heterodimer that serves two distinct cellular functions: structural adaptation within cullin-RING E3 ubiquitin ligases and stimulation of RNA polymerase II transcription elongation [#0, #3]. As an elongation factor, ELOB-ELOC anchors to ELOA, which binds the RPB2 side of transcribing Pol II and inserts a 'latch' element into the bridge-helix/funnel region of the active center to allosterically stimulate elongation [#0]. As a ligase adaptor, the ELOB-ELOC heterodimer bridges BC-box/SOCS-box substrate receptors to CUL2 or CUL5 scaffolds, enabling assembly of CRL2 and CRL5 complexes that ubiquitinate diverse substrates; structural and HDX-MS analyses show ELOB-ELOC functions as a flexible hinge that transmits long-range allosteric crosstalk from substrate receptor through cullin to the catalytic RING subunit [#10]. Through this adaptor role, ELOB supports degradation of substrates including p14/ARF via the CRL2-PRAME complex [#14, #15], IMPDH isoforms via ANKRD9-CUL5 [#17], SMAD1 via ZSWIM4-CUL2 to attenuate BMP signaling [#19], SQOR via ASB1 in spermiogenesis [#18], and TNP2 via ASB9 during the histone-to-protamine transition [#30]. Viral proteins exploit this machinery: HIV-1 Vif recruits CBF-\\u03b2, CUL5, ELOB, ELOC, and RBX2 to ubiquitinate APOBEC3 proteins, with Vif binding ELOC through its BC-box and a Pro-Pro-Leu-Pro motif contacting the ELOB C-terminal domain via induced folding [#1, #4, #22]; analogous BC-box-mediated recruitment occurs for non-primate lentiviral Vifs, adenoviral Gam1, and rotavirus NSP1, where Elongin BC additionally stabilizes the viral antagonist proteins [#11, #13, #25]. ELOB also participates in chromatin-associated and elongation-coupled functions, being recruited as a PRC2-associated subunit to lineage-specifier promoters in a cell-cycle-dependent manner [#9], and its BC-box-binding pocket can be blocked by a high-affinity EPOP-derived peptide that disrupts partner association and induces apoptosis in cancer cells [#24].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Establishing that ELOB-ELOC are core components of a virally co-opted SCF-like E3 ligase answered how HIV-1 Vif directs APOBEC3G to degradation, defining the SOCS-box/BC-box as the docking principle for ELOC.\",\n      \"evidence\": \"Co-IP, in vitro/in vivo ubiquitination, mutagenesis and phosphorylation analysis of the Vif-CUL5-ELOB-ELOC complex\",\n      \"pmids\": [\"15574592\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not provide atomic-resolution architecture of the assembled complex\", \"Role of CBF-\\u03b2 not yet known\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstrating that adenoviral Gam1 recruits the SUMO E1 into ELOB-ELOC-containing CUL2/5 ligases extended the adaptor role beyond lentiviral Vif to a broader viral strategy of co-opting ELOB-based ligases.\",\n      \"evidence\": \"Co-IP, in vitro/in vivo ubiquitination, knockdown/rescue in cells\",\n      \"pmids\": [\"17392274\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural characterization of the Gam1-ELOB-ELOC interface\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Resolving that Vif binds ELOB-ELOC at two sites by induced folding\\u2014BC-box to ELOC and a PPLP motif to the ELOB C-terminus\\u2014revealed ELOB as an active, conformation-determining partner rather than a passive scaffold.\",\n      \"evidence\": \"Purified-protein binding, ITC, NMR and cell-based functional assays\",\n      \"pmids\": [\"20532212\", \"24225024\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define how these interactions position substrate relative to the catalytic RING\", \"PPLP-ELOB interaction characterized as weak\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showing that CBF-\\u03b2 prestabilizes Vif and raises CUL5 affinity ~60-fold, with ELOB-ELOC enhancing Vif folding and solubility, clarified the assembly hierarchy and ELOB's chaperone-like contribution to complex stability.\",\n      \"evidence\": \"Protein co-expression/purification, solubility assays, ITC with heat-capacity analysis\",\n      \"pmids\": [\"22479405\", \"23098073\", \"23988114\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab biophysical measurements\", \"Mechanism of ELOB-mediated stabilization of partner proteins not generalized beyond Vif at this stage\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Crystallography of the Vif-CBF-\\u03b2-CUL5-ELOB-ELOC pentamer showed Vif mimics SOCS2 and that ELOC/CUL5 are engaged cooperatively, providing the first complete view of how ELOB-ELOC bridge a SOCS-box receptor to a cullin.\",\n      \"evidence\": \"X-ray crystallography of the reconstituted pentameric complex\",\n      \"pmids\": [\"24402281\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Static structure did not capture catalytic dynamics or substrate engagement\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrating that non-primate lentiviral Vifs (BIV, MVV) recruit ELOB-ELOC through BC-box motifs\\u2014with CUL2 or CUL5 and independently of CBF-\\u03b2\\u2014established the universality and modularity of ELOB-ELOC adaptor usage across cullin scaffolds.\",\n      \"evidence\": \"Co-IP, siRNA knockdown, BC-box mutagenesis and degradation assays across viral systems\",\n      \"pmids\": [\"25142583\", \"25213124\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structures of these non-primate complexes\", \"Determinants of CUL2- vs CUL5-selection not defined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identifying cellular ASB9- and ANKRD9-based CRL5 complexes with defined substrates (TNP2, IMPDH) confirmed that ELOB-ELOC serve endogenous, physiologically important ligases beyond viral hijacking.\",\n      \"evidence\": \"Quantitative proteomics, complex reconstitution, in vitro/in vivo ubiquitination assays\",\n      \"pmids\": [\"30293565\", \"41915740\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Substrate selectivity rules for individual ASB/receptor proteins not fully resolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Cryo-EM and HDX-MS of the ASB9-ELOB-ELOC-CUL5-RBX2 complex with substrate revealed ELOB-ELOC as a flexible hinge transmitting long-range allosteric crosstalk, redefining the heterodimer as a conformational signal conduit rather than a rigid spacer.\",\n      \"evidence\": \"Cryo-EM with HDX-MS conformational analysis of the substrate-bound complex\",\n      \"pmids\": [\"32513959\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this hinge behavior generalizes to all ELOB-ELOC ligases not established\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Detecting ELOB enrichment at lineage-specifier promoters in G1 as a PRC2-associated subunit linked ELOB to cell-cycle-coupled chromatin regulation, hinting at a nuclear role distinct from its ligase function.\",\n      \"evidence\": \"ChIP-seq with cell-cycle synchronization, live-cell imaging, transcriptional analysis in mouse ESCs\",\n      \"pmids\": [\"32181346\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct biochemical mechanism connecting ELOB to PRC2 not defined\", \"Whether recruitment is via elongation or ligase activity unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Cryo-EM of human Elongin (ELOA-ELOB-ELOC) on transcribing Pol II defined the structural basis of the second major function: an ELOA latch allosterically modulates the active center, with ELOB-ELOC anchoring ELOA to the polymerase.\",\n      \"evidence\": \"Cryo-EM with latch-mutant elongation and Pol II binding assays\",\n      \"pmids\": [\"37932450\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific contribution of ELOB versus ELOC to elongation stimulation not separately dissected\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Expanding ELOB-ELOC substrates and partners (AXL, USP51-VHL-HIF1A, EPOP-binding pocket, viral antagonists) revealed both ligase-promoting and ligase-counteracting roles and identified the BC-box pocket as a druggable target.\",\n      \"evidence\": \"CRISPR screens, Co-IP, deubiquitination/SUMOylation assays, high-affinity peptide binding and RNA-seq\",\n      \"pmids\": [\"36753617\", \"37816999\", \"37354906\", \"37640699\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How a single ELOB-ELOC pocket is partitioned among competing BC-box partners in cells unresolved\", \"VHL-independent AXL regulation mechanism not fully mapped\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showing that ELOB-ELOC not only adapt ligases but also stabilize BC-box-containing viral innate-immune antagonists (rotavirus NSP1, pestiviral N-pro, adenovirus E4orf6) generalized the chaperone-like stabilizing function across viruses.\",\n      \"evidence\": \"CRISPR KO and siRNA knockdown of TCEB2, recombinant virus BC-box mutagenesis, IRF3 degradation and interferon assays\",\n      \"pmids\": [\"42234532\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of stabilization versus ligase adaptation not distinguished\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"ELOB knockout impairing diffuse midline glioma growth with redistribution of H3K27M/H3K27me3 and disrupted Pol II transcription tied ELOB's elongation/chromatin roles to an oncogenic dependency.\",\n      \"evidence\": \"CRISPR KO, PRO-seq, RNA-seq, ChIP-seq and xenograft models (preprint)\",\n      \"pmids\": [\"42239282\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, single lab, not peer-reviewed\", \"Mechanistic link between ELOB and H3K27M genomic occupancy not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single ELOB-ELOC heterodimer is allocated between its transcription-elongation function and dozens of competing BC-box ligase receptors\\u2014and how this partitioning is regulated across cell cycle, tissue, and disease\\u2014remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No quantitative model of ELOB-ELOC distribution among competing partners\", \"Regulation of the elongation versus ligase pools not defined\", \"Distinct biochemical contribution of ELOB itself (vs ELOC) to most functions not separated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 10, 4]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [1, 3, 17]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [10, 0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [9, 19]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [1, 3, 10, 17]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [1, 22, 25]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [25, 1]}\n    ],\n    \"complexes\": [\n      \"Elongin (SIII) complex (ELOA-ELOB-ELOC)\",\n      \"CUL5-RBX2 cullin-RING E3 ligase (CRL5)\",\n      \"CUL2-RBX1 cullin-RING E3 ligase (CRL2)\",\n      \"Vif-CBF-\\u03b2-CUL5-ELOB-ELOC-RBX2 complex\"\n    ],\n    \"partners\": [\n      \"ELOC\",\n      \"ELOA\",\n      \"CUL5\",\n      \"CUL2\",\n      \"Vif\",\n      \"ASB9\",\n      \"ANKRD9\",\n      \"USP51\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}