{"gene":"DCAF1","run_date":"2026-06-09T22:57:19","timeline":{"discoveries":[{"year":2001,"finding":"DCAF1/VprBP (KIAA0800) was cloned as a 1507-aa cytoplasmic protein that directly binds HIV-1 Vpr in vitro and in vivo; the Vpr-binding domain was mapped to the C-terminal half of VprBP containing a Pro-rich domain and Phe-x-x-Phe repeats. Co-expression of VprBP sequesters Vpr in the cytoplasm, blocking its nuclear transport.","method":"In vitro binding assay with recombinant proteins, co-immunoprecipitation, subcellular fractionation, adenoviral expression, Vpr-GFP nuclear transport assay, VprBP mutational analysis","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal binding confirmed in vitro and in vivo, mutational mapping, single lab with multiple orthogonal methods","pmids":["11223251"],"is_preprint":false},{"year":2007,"finding":"DCAF1/VprBP serves as the substrate receptor bridging HIV-1 Vpr to the Cul4-DDB1 ubiquitin ligase complex; this interaction is essential for Vpr-induced G2 cell cycle arrest, which is abolished by single Vpr mutations impairing DCAF1 binding or by siRNA-mediated DCAF1 silencing.","method":"Co-immunoprecipitation, siRNA knockdown, cell cycle analysis (G2 arrest assay), point mutagenesis of Vpr","journal":"Cell cycle (Georgetown, Tex.)","confidence":"High","confidence_rationale":"Tier 2 / Strong — independently replicated across multiple labs, reciprocal Co-IP, functional rescue by siRNA and mutagenesis","pmids":["17314515","17609381","18606781"],"is_preprint":false},{"year":2007,"finding":"Vpr binding to the VprBP subunit of the Cul4-DDB1[VprBP] E3 complex increases neddylation and intrinsic ubiquitin ligase activity of this E3. VprBP also has an independent role in regulating G1 phase and is required for completion of DNA replication in S phase.","method":"Affinity purification/mass spectrometry, co-immunoprecipitation, neddylation assay, siRNA knockdown with cell cycle analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS interactome plus functional assays in single lab","pmids":["17609381"],"is_preprint":false},{"year":2007,"finding":"HIV-1 Vpr engages the DDB1- and CUL4A-containing ubiquitin ligase complex through VprBP/DCAF1; both the Vpr–VprBP interaction and assembly of the full ubiquitin ligase are necessary for Vpr-mediated G2 arrest.","method":"Co-immunoprecipitation, tandem mass spectrometry, functional G2 arrest assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — replicated across labs with reciprocal Co-IP and functional validation","pmids":["17620334"],"is_preprint":false},{"year":2008,"finding":"DCAF1/VprBP functions as the substrate adaptor that recruits Merlin (NF2) to the Roc1-Cul4A-DDB1 E3 ligase complex for polyubiquitination and proteasome-mediated degradation following serum stimulation; VprBP depletion stabilizes Merlin and inhibits ERK and Rac1 activation.","method":"Co-immunoprecipitation, siRNA knockdown, ubiquitination assay, western blot for ERK/Rac activation","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and ubiquitination assay, functional pathway readout, single lab","pmids":["18332868"],"is_preprint":false},{"year":2008,"finding":"VprBP/DCAF1 binds stoichiometrically with DDB1 through its WD40 domain and through DDB1 to CUL4A; steady-state VprBP decreases during mitosis, and VprBP binds chromatin in a DDB1-independent, cell cycle-dependent manner (peaks in G2). Silencing VprBP reduces DNA replication rate, blocks S-phase progression, and VprBP ablation in mice causes early embryonic lethality.","method":"Co-immunoprecipitation, chromatin fractionation, cell cycle synchronization, siRNA knockdown, BrdU incorporation, conditional mouse knockout","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (biochemical, cell biology, genetic mouse model) in single rigorous study","pmids":["18606781"],"is_preprint":false},{"year":2008,"finding":"HIV-2/SIVmac Vpx associates with VprBP/DCAF1 and the Cullin 4 E3 complex; this interaction is required for efficient reverse transcription of SIVmac in primary macrophages. Depletion of VprBP by RNAi renders macrophages resistant to SIVmac infection.","method":"Biochemical and proteomic pulldown, co-immunoprecipitation, siRNA knockdown, infection assay measuring reverse transcripts","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 2 / Strong — MS interactome, reciprocal Co-IP, functional rescue in primary cells, replicated by multiple labs","pmids":["18464893","19264781"],"is_preprint":false},{"year":2009,"finding":"HIV-2 Vpx assembles with CUL4A-DDB1 through DCAF1 recruitment; preventing Vpx from recruiting DCAF1 in target macrophages causes a post-entry block with defective accumulation of reverse transcripts, and SIVsm Vpx functionally complements Vpx-defective HIV-2 in a DCAF1-binding-dependent manner.","method":"Co-immunoprecipitation, siRNA knockdown, viral infection assay, reverse transcription quantification","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal functional assays, replicated across labs","pmids":["19264781"],"is_preprint":false},{"year":2010,"finding":"Merlin (NF2 tumor suppressor) in its closed growth-inhibitory form translocates to the nucleus, directly binds CRL4(DCAF1), and suppresses its E3 ubiquitin ligase activity. DCAF1 depletion blocks the pro-mitogenic effect of Merlin inactivation; tumor-derived mutations disrupt Merlin–DCAF1 interaction.","method":"Co-immunoprecipitation, siRNA knockdown, nuclear fractionation, gene expression profiling, schwannoma cell proliferation assays, tumor cell line tumorigenicity assays","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods, functional epistasis, disease-relevant mutations tested, replicated in multiple cell types","pmids":["20178741"],"is_preprint":false},{"year":2010,"finding":"HIV-1 Vpr loads UNG2 onto DCAF1 forming a heterotrimeric VprBP–Vpr–UNG2 complex in vitro and in vivo; reconstituted CRL4(DCAF1-Vpr) E3 ubiquitin ligase ubiquitinates UNG2 in vitro, and co-expression of DCAF1 with Vpr causes proteasome-dependent UNG2 degradation.","method":"In vitro reconstitution with recombinant proteins, in vitro ubiquitination assay, co-immunoprecipitation, proteasome inhibitor rescue","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of ubiquitination, replicated across labs","pmids":["20870715"],"is_preprint":false},{"year":2010,"finding":"Vpr forms mobile chromatin-associated nuclear foci containing VPRBP/DCAF1; Vpr associates with chromatin via its C-terminal domain and forms a complex with VPRBP on chromatin. These nuclear foci are required for G2 arrest; VPRBP depletion does not prevent foci formation but does prevent G2 arrest.","method":"Immunofluorescence, confocal microscopy, time-lapse microscopy, chromatin fractionation, co-immunoprecipitation, siRNA knockdown","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct imaging and biochemical fractionation, single lab with multiple orthogonal methods","pmids":["20824083"],"is_preprint":false},{"year":2010,"finding":"Mahjong/VprBP (Drosophila ortholog of DCAF1) is a novel binding partner of Lgl (lethal giant larvae) in both flies and mammals; mahj mutant cells undergo apoptosis when surrounded by wild-type cells via the JNK pathway, establishing that Mahjong and Lgl function in the same pathway to regulate cellular competitiveness.","method":"Biochemical immunoprecipitation, Drosophila genetics (wing disc analysis), RNAi knockdown in MDCK cells, JNK pathway inhibition","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, in vivo genetic epistasis in Drosophila, mammalian cell confirmation, multiple orthogonal methods","pmids":["20644714"],"is_preprint":false},{"year":2011,"finding":"CRL4-DCAF1 complex dimerizes via a short helical region (residues 845–873, designated LisH motif) N-terminal to DCAF1's WD40 domain; four Leu residues in this helix are essential for oligomerization. Dimeric CRL4(DCAF1) is more active as an E3 ligase for UNG2 ubiquitination in vitro than monomeric complex.","method":"Electron microscopy, in vitro reconstitution, in vitro ubiquitination assay, mutagenesis of oligomerization helix","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — EM structure, in vitro reconstitution, mutagenesis in single rigorous study","pmids":["21226479"],"is_preprint":false},{"year":2011,"finding":"VprBP/DCAF1 associates with full-length RAG1 through a multi-subunit CRL4 complex (VprBP/DDB1/Cul4A/Roc1); conditional B-lineage VprBP disruption arrests B-cell development at the pro-B to pre-B transition with severely impaired V(D)J recombination and increased error-prone repair.","method":"Co-immunoprecipitation, in vitro ubiquitylation, conditional B-cell specific knockout mouse, flow cytometry, V(D)J recombination assay, sequencing of coding joints","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, in vitro ubiquitylation, in vivo conditional knockout with defined cellular phenotypes","pmids":["22157821"],"is_preprint":false},{"year":2012,"finding":"DCAF1's putative chromo domain directly recognizes monomethylated substrates generated by EZH2; mutations in the DCAF1 chromo domain binding pocket abolish binding to monomethylated substrates. EZH2 methylates RORα, creating a methyl degron recognized by DCAF1/DDB1/CUL4 for ubiquitin-mediated degradation.","method":"Molecular modeling, binding affinity assays, mutagenesis of DCAF1 chromo domain, in vitro methylation assay, ubiquitination assay","journal":"Molecular cell","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — binding assay with mutagenesis, in vitro methylation and ubiquitination, single lab","pmids":["23063525"],"is_preprint":false},{"year":2012,"finding":"A conserved Wx4Φx2Φx3AΦxH motif in SIVmac Vpx and HIV-1 Vpr is required for DCAF1 interaction and Vpx-mediated SAMHD1 degradation. DCAF1 and SAMHD1 interactions in Vpx involve distinct interfaces; VpxW24A mutants still bind DCAF1 and SAMHD1 but cannot trigger SAMHD1 degradation.","method":"Mutational analysis, co-immunoprecipitation, SAMHD1 degradation assay, viral infection assay","journal":"Cellular microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic mutagenesis with functional readouts, single lab","pmids":["22776683"],"is_preprint":false},{"year":2012,"finding":"CRL4-DDB1-VprBP/DCAF1 ubiquitin ligase mediates stress-induced (UV) proteolysis of the DNA replication factor Mcm10; VprBP is the substrate recognition subunit that targets Mcm10. The purified Cul4-Roc1-DDB1 complex ubiquitinates Mcm10 in vitro.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, siRNA knockdown, UV irradiation assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstituted ubiquitination, functional genetic knockdown, single lab with multiple methods","pmids":["22570418"],"is_preprint":false},{"year":2012,"finding":"DCAF1/VprBP constitutively targets UNG2 and SMUG1 for CRL4(DCAF1)-mediated degradation independently of Vpr; UNG2 assembles with the ubiquitin ligase complex in the absence of Vpr, but Vpr enhances this interaction at low Vpr concentrations while high Vpr concentrations block UNG2 depletion.","method":"Co-immunoprecipitation, siRNA knockdown, proteasome inhibitor rescue, cell fractionation","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — dose-dependent mechanistic analysis with multiple readouts, single lab","pmids":["22292079"],"is_preprint":false},{"year":2013,"finding":"VprBP/DCAF1 possesses intrinsic protein kinase activity and phosphorylates histone H2A on threonine 120 (H2AT120) in a nucleosomal context; VprBP localizes to tumor suppressor gene loci and blocks their transcription in a kinase-activity-dependent manner.","method":"In vitro kinase assay with nucleosomes, mutagenesis of kinase domain, ChIP, RNAi knockdown, small-molecule inhibitor studies, xenograft tumor growth","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase reconstitution with nucleosomes, mutagenesis, ChIP, and in vivo tumor model","pmids":["24140421"],"is_preprint":false},{"year":2013,"finding":"Dyrk2 phosphorylates TERT, creating a phospho-degron recognized by the EDD-DDB1-VprBP/DCAF1 E3 ligase complex, leading to TERT ubiquitination and degradation; this regulation is cell cycle-dependent (G2/M phase) and telomerase activity is constitutively elevated upon Dyrk2 depletion.","method":"Co-immunoprecipitation, in vitro kinase assay, ubiquitination assay, siRNA knockdown, telomerase activity assay, cell cycle synchronization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay plus ubiquitination, functional telomerase readout, single lab with multiple methods","pmids":["23362280","23612978"],"is_preprint":false},{"year":2013,"finding":"VprBP/DCAF1 serves as a substrate recognition subunit for both the RING-type CRL4 ligase and the HECT-type EDD/UBR5 ligase, representing an unusual dual-service substrate receptor.","method":"Review synthesizing biochemical and proteomic data from primary studies (co-immunoprecipitation, mass spectrometry)","journal":"BMC molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — synthesis of multiple primary experimental studies, not new experiments in this paper","pmids":["24028781"],"is_preprint":false},{"year":2013,"finding":"HIV-1 Vpr induces degradation of ZIP and sZIP (NuRD complex adaptors) by hijacking DCAF1; ZIP/sZIP degradation requires proteasome activity and is abolished by a DCAF1-binding-deficient Vpr mutant or DCAF1 siRNA knockdown. Vpr co-localizes with Cul4A ligase subunits exclusively on chromatin.","method":"Co-immunoprecipitation, siRNA knockdown, proteasome inhibitor rescue, cellular fractionation","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal approaches (genetic, pharmacological, fractionation), single lab","pmids":["24116224"],"is_preprint":false},{"year":2014,"finding":"Derepressed CRL4(DCAF1) promotes YAP/TEAD-dependent transcription by ubiquitylating and inhibiting Lats1 and Lats2 in the nucleus; genetic epistasis experiments confirm this signaling axis sustains oncogenicity of Merlin-deficient tumor cells.","method":"Co-immunoprecipitation, ubiquitination assay, genetic epistasis (double knockdown/overexpression), YAP/TEAD reporter assay, analysis of NF2-mutant tumor samples","journal":"Cancer cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, ubiquitination assay, epistasis, disease sample validation, replicated concept from prior lab work","pmids":["25026211"],"is_preprint":false},{"year":2014,"finding":"CRL4(VprBP/DCAF1) monoubiquitylates all three TET dioxygenases on a conserved lysine (K1299 for TET2), promoting TET chromatin binding; deletion of VprBP in oocytes abrogates paternal DNA hydroxymethylation in zygotes. Leukemia-derived TET2 inactivating mutations target either the monoubiquitylation site or VprBP-binding residues.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, conditional oocyte-specific VprBP knockout mouse, 5hmC immunofluorescence, mutational analysis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution, conditional genetic KO in mouse, disease mutation validation, multiple orthogonal methods","pmids":["25557551"],"is_preprint":false},{"year":2014,"finding":"Crystal structure of the Merlin FERM domain bound to the DCAF1 C-terminal acidic tail reveals that the hydrophobic IILXLN motif of DCAF1 binds subdomain C of the FERM domain as a β-strand; CD44 cytoplasmic tail competes with DCAF1 for binding to the same Merlin FERM binding groove.","method":"X-ray crystallography, competition binding assay","journal":"Genes to cells : devoted to molecular & cellular mechanisms","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure plus competition binding assay, single lab","pmids":["24912773"],"is_preprint":false},{"year":2014,"finding":"Crystal structure of the Merlin FERM domain in complex with DCAF1 binding domain reveals that the Merlin-FERM binding domain of DCAF1 folds as a β-hairpin and binds the α1/β5-groove of the F3 lobe via extensive hydrophobic interactions.","method":"X-ray crystallography","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure, corroborated by independent structural study","pmids":["24706749"],"is_preprint":false},{"year":2014,"finding":"The minimal DCAF1-WD domain (residues 1041–1393) retains Vpr and DDB1 binding; an α-helical H-box motif and F/YxxF/Y motifs in the N-terminal portion of DCAF1-WD are required exclusively for DDB1 binding; Vpr binding to DCAF1 modulates DDB1/DCAF1 complex formation, and expression of DCAF1-WD alone is insufficient for Vpr-mediated G2 arrest.","method":"Mutagenesis, co-immunoprecipitation, G2 arrest functional assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic mutagenesis with co-IP and functional readout, single lab","pmids":["24558487"],"is_preprint":false},{"year":2015,"finding":"CRL4-DCAF1 controls oocyte meiotic maturation by directing proteasomal degradation of PP2A scaffold subunit PP2A-A; oocyte-specific deletion of DDB1 or DCAF1 causes PP2A-A accumulation and meiosis failure; combined deletion of Ppp2r1a rescues meiotic defects.","method":"Oocyte-specific conditional knockout mouse, in vitro ubiquitination assay (DCAF1 directly ubiquitinates PP2A-A), genetic rescue (double KO), western blot","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro ubiquitination reconstitution, conditional genetic KO, genetic epistasis rescue, multiple orthogonal methods","pmids":["26281983"],"is_preprint":false},{"year":2015,"finding":"HIV-1 Vpr indirectly binds MCM10 (DNA replication factor) in a VprBP-dependent manner; Vpr enhances ubiquitination and proteasomal degradation of MCM10, and this correlates with Vpr-induced G2/M arrest. MCM10 is identified as a natural substrate of Cul4-DDB1[VprBP].","method":"Co-immunoprecipitation, ubiquitination assay, proteasome inhibitor rescue, G2/M arrest analysis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ubiquitination assay with functional correlation, single lab","pmids":["26032416"],"is_preprint":false},{"year":2015,"finding":"Lgl associates with the VprBP-DDB1 complex independently of the PAR-aPKC complex and prevents VprBP-DDB1 from binding CUL4A, thereby inhibiting CRL4[VprBP] E3 ligase activity. aPKC-mediated phosphorylation of Lgl2 negatively regulates Lgl2–VprBP-DDB1 interaction; depletion of VprBP or Cul4 rescues overproliferation of Lgl-depleted cells.","method":"Co-immunoprecipitation, siRNA knockdown, cell proliferation assay, phosphomimetic mutant analysis","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, genetic rescue, phosphoregulation analysis, single lab","pmids":["25947136"],"is_preprint":false},{"year":2016,"finding":"Crystal structure of the DDB1-DCAF1-HIV-1 Vpr-UNG2 complex reveals how Vpr engages DCAF1 and creates a new binding surface for UNG2 recruitment via molecular mimicry of DNA by a Vpr variable loop; Vpr and Vpx use similar N-terminal/helical regions to bind DCAF1 but different regions to recruit their specific substrates.","method":"X-ray crystallography","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution crystal structure of quaternary complex","pmids":["27571178"],"is_preprint":false},{"year":2016,"finding":"DCAF1 is essential for T-cell growth, cell cycle entry, and proliferation upon activation; DCAF1 deletion stabilizes p53 protein by impairing MDM2-mediated p53 poly-ubiquitination, and p53 deletion rescues the cell cycle defect but not the growth defect of DCAF1-deficient T cells.","method":"Conditional T-cell-specific DCAF1 knockout mouse, flow cytometry, western blot, genetic rescue (p53 deletion), ubiquitination assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional in vivo KO with epistasis rescue, ubiquitination assay, multiple orthogonal methods","pmids":["26728942"],"is_preprint":false},{"year":2016,"finding":"CUL4A(DCAF1) E3 ubiquitin ligase targets DICER1 for proteasomal degradation in response to Jak-STAT3 pathway activation; PI3K-AKT-mediated phosphorylation of DICER1 contributes to its degradation by this complex.","method":"Co-immunoprecipitation, siRNA knockdown, ubiquitination assay, xenograft tumor model","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ubiquitination assay with phosphorylation involvement, single lab","pmids":["26965998"],"is_preprint":false},{"year":2017,"finding":"VprBP/DCAF1 promotes FoxM1 ubiquitylation and degradation via CRL4; paradoxically, VprBP also activates FoxM1 transcription through a ligase-independent mechanism. VprBP binding to CRL4 is reduced during mitosis, and VprBP activation of FoxM1 is independent of ubiquitin ligase function.","method":"Co-immunoprecipitation, ubiquitination assay, FoxM1 transcriptional reporter assay, cell synchronization, siRNA knockdown","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional assays separating proteolytic vs. non-proteolytic activities, single lab","pmids":["28416635"],"is_preprint":false},{"year":2017,"finding":"Zinc coordination via a conserved zinc-binding motif in Vpx and Vpr is required for CRL4(DCAF1) E3 ligase assembly and DCAF1 interaction; zinc chelation by TPEN selectively inhibits Vpx/Vpr–DCAF1 binding and blocks SAMHD1/HLTF degradation and viral infection, without affecting Vpx–SAMHD1 interaction.","method":"Co-immunoprecipitation, mutagenesis of zinc-binding motif, zinc chelation (TPEN treatment), SAMHD1/HLTF degradation assays, viral infection assay","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic mutagenesis, pharmacological disruption, multiple functional readouts, single lab","pmids":["28202763"],"is_preprint":false},{"year":2017,"finding":"HIV-1 Vpr directly loads HLTF onto the C-terminal WD40 domain of DCAF1 in the CRL4 complex for polyubiquitination; Vpr interacts with DNA-binding residues in the HIRAN domain of HLTF (similar to UNG2 recruitment) and additionally engages a second region connecting the HIRAN and ATPase/helicase domains.","method":"In vitro reconstitution ubiquitination assay, mutational analysis, co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with mutagenesis, single lab","pmids":["29079575"],"is_preprint":false},{"year":2018,"finding":"HIV-1 Vpr targets TET2 for polyubiquitylation by the VprBP-DDB1-CUL4-ROC1 E3 ligase and subsequent proteasomal degradation; Vpr-mediated TET2 degradation sustains IL-6 expression by reducing HDAC1/2 recruitment to the IL-6 promoter, enhancing H3K27 acetylation, thereby promoting HIV-1 replication.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, conditional TET2 knockout, chromatin immunoprecipitation, IL-6 ELISA, viral replication assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of ubiquitination, ChIP mechanistic data, genetic KO with functional rescue, multiple orthogonal methods","pmids":["29883611"],"is_preprint":false},{"year":2018,"finding":"HIV-1 Vpr recruits Exo1 (exonuclease 1) to the CRL4DCAF1 E3 complex for ubiquitination and proteasomal degradation; Exo1 inhibits HIV-1 replication in T cells, and antagonism of Exo1 is conserved across main group HIV-1 and SIVcpz Vpr proteins.","method":"Focused substrate screen, co-immunoprecipitation, ubiquitination assay, HIV replication assay with Exo1 knockdown/overexpression, evolutionary conservation analysis","journal":"mBio","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ubiquitination assay plus functional viral replication readout, single lab","pmids":["30352932"],"is_preprint":false},{"year":2018,"finding":"CUL4-DDB1-VPRBP E3 ubiquitin ligase complex promotes post-replicative ESCO2 degradation in late S phase; ESCO2 physically interacts with the complex and its degradation requires both CUL4-DDB1-VPRBP and the anaphase-promoting complex.","method":"Co-immunoprecipitation, cell synchronization, proteasome inhibitor rescue, siRNA knockdown","journal":"Current biology : CB","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with cell cycle synchronization and genetic knockdown, single lab","pmids":["30100344"],"is_preprint":false},{"year":2018,"finding":"Vpr localizes to the centrosome through DCAF1, forming a complex with EDD-DYRK2-DDB1(DCAF1) and Cep78; Vpr enhances ubiquitination of CP110 (an EDD substrate) leading to its degradation, causing centriole elongation and increased microtubule nucleation. Infection with HIV-1 (but not Vpr-deleted HIV-1) promotes CP110 degradation in T lymphocytes.","method":"Co-immunoprecipitation, immunofluorescence/confocal microscopy, ubiquitination assay, HIV-1 infection assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, imaging, ubiquitination assay, primary cell infection, single lab","pmids":["29724823"],"is_preprint":false},{"year":2020,"finding":"DCAF1 is downregulated in aged Tregs and restrains Treg aging via reactive oxygen species regulated by GSTP1 (glutathione-S-transferase P); the DCAF1/GSTP1/ROS axis controls Treg senescence, proliferation, and suppressive function.","method":"Conditional T-cell-specific DCAF1 knockout mouse, ROS assays, inflammatory bowel disease model, irradiation-induced aging model, GSTP1 inhibition experiments","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional in vivo KO with multiple in vivo functional models and pathway epistasis","pmids":["32730228"],"is_preprint":false},{"year":2020,"finding":"DCAF1 targets NRF2 for proteasomal degradation in a KEAP1-independent manner; DCAF1 directly interacts with NRF2, and small molecule BC-1901S disrupts NRF2/DCAF1 interaction to stabilize NRF2.","method":"High-throughput screening, co-immunoprecipitation, ubiquitination assay, NRF2 stability assay, anti-oxidant gene expression","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with ubiquitination assay and pharmacological disruption, single lab","pmids":["32171724"],"is_preprint":false},{"year":2020,"finding":"DCAF1 loss in multiple tissues selectively eliminates proliferating cells and causes perinatal lethality, thymic atrophy, and bone marrow defects; DCAF1 targets ribosome assembly factor PWP1 for degradation — DCAF1 loss causes PWP1 accumulation that impairs rRNA processing and ribosome biogenesis, leading to free RPL11 increase and L11-MDM2 association with p53 activation.","method":"Conditional tissue-specific knockout mice (multiple tissues), inducible KO in T cells and MEFs, mass spectrometry substrate identification, ribosome profiling, ubiquitination assay, siRNA/overexpression rescue experiments","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple tissue conditional KOs, MS substrate identification, rescue epistasis experiments, multiple orthogonal methods","pmids":["33355139"],"is_preprint":false},{"year":2021,"finding":"HIV-1 Vpr mediates poly-ubiquitination and degradation of SIRT7 (histone H3 deacetylase) via CRL4-DCAF1; in vitro reconstitution assays confirm Vpr-induced SIRT7 polyubiquitination. SIRT7 degradation by Vpr is conserved across multiple HIV-1 strains (not HIV-2) and is independent of the Vpr-induced G2 arrest phenotype.","method":"In vitro reconstitution ubiquitination assay, co-immunoprecipitation, proteasome inhibitor rescue, Vpr mutant analysis","journal":"Virology journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of ubiquitination with controls, strain panel tested, single lab","pmids":["33648539"],"is_preprint":false},{"year":2021,"finding":"HIV-2 Vpx bridges SAMHD1 to DCAF1 for degradation, while TASOR (HUSH complex component) interacts with DCAF1 independently of Vpx; Vpx stabilizes the TASOR–DCAF1 association. TASOR degradation requires a robust Vpx–DCAF1 interaction mediated by TASOR's N-terminal PARP-like domain.","method":"Co-immunoprecipitation, Vpx mutagenesis, TASOR/SAMHD1 degradation assays in macrophages","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic mutant analysis separating two substrate pathways, primary cell validation, single lab","pmids":["34699574"],"is_preprint":false},{"year":2022,"finding":"Electrophilic azetidine acrylamides stereoselectively and site-specifically react with Cys1113 (C1113) in DCAF1; this covalent modification supports PROTAC-mediated targeted protein degradation in human cells. A C1113A DCAF1 mutant abolishes PROTAC activity, and only low fractional DCAF1 engagement is required for degradation.","method":"Chemical proteomics (activity-based protein profiling), DCAF1 C1113A mutagenesis, PROTAC cell-based degradation assay, stereochemical profiling","journal":"Journal of the American Chemical Society","confidence":"High","confidence_rationale":"Tier 1 / Moderate — chemical proteomics site identification, functional mutagenesis validation, cell-based mechanism studies, single rigorous study","pmids":["36170674"],"is_preprint":false},{"year":2022,"finding":"DCAF1 is regulated by the androgen receptor (AR) at the transcript level and stabilized by OGT at the protein level; DCAF1 knockdown in prostate cancer cells increases p53 stabilization and nucleolar fragmentation, restraining p53 activation downstream of AR and OGT.","method":"siRNA knockdown, western blot, flow cytometry, ChIP-seq, clinical sample correlation","journal":"Molecular cancer research : MCR","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockdown with mechanistic protein-level readouts, single lab","pmids":["35348747"],"is_preprint":false},{"year":2022,"finding":"Mahjong/DCAF1 loss in Drosophila cells triggers Xrp1 bZip transcription factor expression, which activates JNK signaling, autophagosome accumulation, eIF2α phosphorylation, and reduced translation — this pathway is independent of apical-basal polarity and couples DCAF1 to protein turnover/cell competition.","method":"Drosophila genetics (mahj, ddb1, cul4 mutants), epistasis analysis with xrp1, JNK pathway reporters, translation assays","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo genetic epistasis in Drosophila, multiple pathway readouts, single lab","pmids":["36278853"],"is_preprint":false},{"year":2023,"finding":"VprBP/DCAF1 kinase phosphorylates EZH2 at T367, augmenting its nuclear stabilization and methyltransferase activity; DCAF1-mediated EZH2 T367 phosphorylation elevates H3K27me3 levels and silences growth-regulatory genes in colon cancer cells. EZH2 requires this phosphorylation for its oncogenic function in organoid and xenograft models.","method":"In vitro kinase assay, phospho-specific antibody, mutagenesis (T367A), ChIP, organoid model, xenograft model","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay with mutagenesis, ChIP mechanistic readout, in vivo preclinical models, single rigorous study","pmids":["37069142"],"is_preprint":false},{"year":2023,"finding":"VprBP/DCAF1 phosphorylates p53 at serine 367 (S367) through a direct interaction with p53's C-terminal domain; S367 phosphorylation promotes p53 proteasomal degradation and suppresses p53 transcriptional activity. p53 acetylation abrogates VprBP–p53 interaction and prevents S367 phosphorylation during DNA damage response.","method":"In vitro kinase assay, phospho-specific antibody, p53 S367A/S367E mutagenesis, co-immunoprecipitation, western blot stability assay","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay with mutagenesis, co-IP regulatory mechanism, single rigorous study","pmids":["37041410"],"is_preprint":false},{"year":2023,"finding":"USP2 deubiquitinase stabilizes VPRBP/DCAF1 protein; VPRBP is a potent p53 repressor whose stability is controlled by USP2. VPRBP also regulates PD-L1 expression, and USP2 inhibition combined with anti-PD1 leads to complete tumor regression in wild-type p53 tumors.","method":"Co-immunoprecipitation, ubiquitination assay, USP2 inhibitor treatment, Usp2 knockout mouse, tumor regression assay","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ubiquitination assay with in vivo genetic KO and functional tumor readout, single lab","pmids":["37024504"],"is_preprint":false},{"year":2023,"finding":"AKT phosphorylates FAM13A at serine 312, which is then recognized by the CUL4A/DCAF1 E3 ligase complex, leading to FAM13A ubiquitination and proteasomal degradation.","method":"Co-immunoprecipitation, ubiquitination assay, phosphomimetic/phosphodeficient mutagenesis, in vivo lung injury models","journal":"American journal of respiratory cell and molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ubiquitination with phosphomutant analysis, in vivo validation, single lab","pmids":["36749583"],"is_preprint":false},{"year":2024,"finding":"Vpr forms a cooperative ternary complex with VprBP/DCAF1 and PLK4 (polo-like kinase 4); this complex promotes PLK4 relocalization to the procentriole assembly and induces centrosome amplification and aneuploidy in CD4+ T cells. The VprBP acidic region and Vpr C-terminal 17 residues are both required for PLK4 binding.","method":"Affinity purification, co-immunoprecipitation, biochemical reconstitution, confocal microscopy, Vpr deletion mutagenesis, primary CD4+ T cell infection assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — affinity purification-MS, reciprocal Co-IP, mutagenesis, primary cell biology, multiple orthogonal methods in single study","pmids":["38443376"],"is_preprint":false},{"year":2024,"finding":"CRL4DCAF1 E3 ubiquitin ligase targets PLK4 for ubiquitylation and degradation in G2 phase to prevent premature centriole duplication; DCAF1 interaction with PLK4 is mediated by PLK4 polo-boxes 1 and 2 and is independent of PLK4 kinase activity, distinguishing it from SCFβ-TrCP-mediated PLK4 regulation.","method":"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, PLK4 mutant analysis, cell cycle analysis","journal":"Life science alliance","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ubiquitination with mutagenesis separating pathways, single lab","pmids":["38490717"],"is_preprint":false},{"year":2024,"finding":"Glucose deprivation transactivates DCAF1 expression, which then promotes K48-linked polyubiquitination and proteasomal degradation of Rheb, inhibiting mTORC1 activity and inducing autophagy to promote cancer cell survival; DCAF1 is identified as a cellular glucose sensor.","method":"Co-immunoprecipitation, ubiquitination assay (K48-linkage specific), DCAF1 knockdown/overexpression, mTORC1 activity assay, autophagy assay","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with ubiquitination assay and functional pathway readouts, single lab","pmids":["38862475"],"is_preprint":false},{"year":2024,"finding":"DOT1L-mediated H3K79me2 recruits DCAF1 to the HIV-1 LTR; upon TNF-α/NF-κB activation, DCAF1 at the LTR ubiquitinates NF-κB and restricts its accumulation at the viral promoter, constituting a feedback repression of HIV reactivation.","method":"Peptide affinity purification, proteomics, co-immunoprecipitation, ChIP, siRNA knockdown, HIV-1 reactivation assay","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — affinity purification-MS, ChIP, Co-IP, functional viral readout, single lab","pmids":["38905100"],"is_preprint":false},{"year":2024,"finding":"STK39 kinase interacts with PPP2R1A (PP2A scaffold subunit) in a kinase-activity-dependent manner and inhibits DCAF1-mediated PPP2R1A degradation, thereby stabilizing PP2A, which suppresses IRF3 phosphorylation and type I interferon production to promote viral immune escape.","method":"Mass spectrometry, co-immunoprecipitation, siRNA knockdown, interferon reporter assay, PP2A phosphatase activity assay, in vivo viral infection model","journal":"Acta pharmaceutica Sinica. B","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS-identified interaction, Co-IP, functional immune readout, in vivo model, single lab","pmids":["40370558"],"is_preprint":false},{"year":2024,"finding":"Crystal structures of DCAF1-PROTAC-WDR5 ternary complexes at high resolution reveal that DCAF1 loops provide surface plasticity for substrate recruitment, enabling DCAF1 to accommodate diverse substrates as an E3 ligase substrate receptor.","method":"X-ray crystallography of ternary complexes, PROTAC-mediated WDR5 degradation assay in cells","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple high-resolution crystal structures with functional cellular validation, single study","pmids":["39580491"],"is_preprint":false},{"year":2024,"finding":"VprBP/DCAF1 stimulates RANKL-induced osteoclast differentiation by phosphorylating H2AT120 to suppress anti-osteoclastogenic genes; abrogating VprBP kinase activity toward H2AT120 blocks osteoclast differentiation in vitro and in vivo.","method":"In vitro kinase assay, VprBP kinase-dead mutant, RANKL-induced osteoclast differentiation assay, in vivo bone loss model, ChIP","journal":"Epigenetics & chromatin","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay with mutagenesis, in vivo model, ChIP, single lab","pmids":["39587626"],"is_preprint":false},{"year":2020,"finding":"VprBP negatively regulates TGF-β and Activin signaling by promoting Smad7-Smurf1-TβRI complex formation, inducing proteasomal degradation of TGF-β type I receptor (TβRI), and stabilizing Smurf1 by suppressing its poly-ubiquitination; VprBP was identified as a novel Smad7 binding partner.","method":"Proteomic interaction screen, co-immunoprecipitation, ubiquitination assay, TGF-β signaling (Smad2 phosphorylation, Smad2-Smad4 interaction), zebrafish embryogenesis assay","journal":"Journal of molecular cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomics-identified interaction, Co-IP, ubiquitination assay, in vivo zebrafish model, single lab","pmids":["31291647"],"is_preprint":false},{"year":2013,"finding":"Autophagy selectively targets VPRBP/DCAF1 for degradation via the LC3B-p62 receptor pathway; VPRBP is a novel LC3B-binding protein, and induction of autophagy reduces VPRBP levels in a manner rescuable by autophagy inhibitors.","method":"GST-LC3B pulldown combined with LC-MS/MS, co-immunoprecipitation (VPRBP-LC3/p62 complex), autophagy induction/inhibition with BFA1 and ATG5 knockdown","journal":"Clinical science (London, England : 1979)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS-identified LC3B interaction, Co-IP, functional autophagy assay, single lab","pmids":["22963397"],"is_preprint":false},{"year":2019,"finding":"The carboxyl-terminal ED-rich region (1312–1417) of DCAF1 is required for nuclear localization of DCAF1 and for Vpx-DCAF1 interaction; Merlin and Vpx bind separate regions of DCAF1 (Merlin is resistant to displacement by Vpx). The DCAF1(1-1311) truncation mutant acts as a dominant negative inhibiting Vpx-mediated SAMHD1 degradation.","method":"DCAF1 truncation/mutagenesis, co-immunoprecipitation, SAMHD1 degradation assay, nuclear localization imaging","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic truncation mutagenesis with Co-IP and functional degradation assay, single lab","pmids":["31003777"],"is_preprint":false},{"year":2018,"finding":"VprBP/DCAF1 regulates RAG1 expression post-transcriptionally and independently of Dicer; loss of VprBP stabilizes RAG1 protein via a mechanism requiring both 20S proteasome and CRL4 ubiquitin ligase activity, and RAG1 stabilization by cullin-RING E3 inhibition promotes V(D)J recombination in pre-B cells.","method":"Conditional B-cell VprBP KO mouse, western blot (RAG1 stability), cullin-RING inhibitor (MLN4924), pre-B cell V(D)J recombination assay","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo conditional KO, pharmacological inhibition, functional V(D)J recombination readout, single lab","pmids":["29925675"],"is_preprint":false},{"year":2025,"finding":"DCAF1 interacts with PARD3 (Par3 polarity protein) and enhances PARD3 expression to activate the Akt signaling pathway, promoting hepatocellular carcinoma growth and metastasis.","method":"Co-immunoprecipitation, mass spectrometry, siRNA knockdown and overexpression, RNA sequencing, in vivo xenograft","journal":"Journal of experimental & clinical cancer research : CR","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP with functional phenotype, mechanism of PARD3 regulation not biochemically defined, single lab","pmids":["38711082"],"is_preprint":false}],"current_model":"DCAF1 (VprBP) is a multifunctional substrate receptor that operates in two distinct E3 ubiquitin ligase contexts — the RING-type CRL4(DCAF1) complex (DDB1-CUL4A-ROC1) and the HECT-type EDD/UBR5 complex — where it recruits diverse substrates for monoubiquitylation or polyubiquitylation-dependent proteasomal degradation; additionally, DCAF1 harbors an intrinsic atypical protein kinase activity that phosphorylates histone H2A on T120 and non-histone proteins including EZH2 and p53 to drive epigenetic gene silencing, and it is constitutively hijacked by HIV-1 Vpr and HIV-2 Vpx, which redirect the CRL4(DCAF1) complex to degrade host restriction factors (SAMHD1, TET2, UNG2, HLTF, Exo1, SIRT7, and others) while also engaging the DCAF1 platform to recruit PLK4 for centrosome amplification."},"narrative":{"mechanistic_narrative":"DCAF1 (VprBP) is a multifunctional substrate receptor that bridges diverse substrates to cullin-RING ubiquitin ligase machinery, controlling cell cycle progression, genome maintenance, epigenetic silencing, and developmental homeostasis [PMID:18606781, PMID:24028781]. Its WD40 domain binds DDB1 stoichiometrically and through DDB1 to CUL4A, assembling the CRL4(DCAF1) E3 complex whose activity is enhanced by LisH-mediated dimerization [PMID:18606781, PMID:21226479]; DCAF1 also serves as a substrate receptor for the HECT-type EDD/UBR5 ligase, an unusual dual-service arrangement [PMID:24028781]. Through CRL4(DCAF1) it directs polyubiquitylation and proteasomal degradation of an array of substrates including the NF2 tumor suppressor Merlin, the replication factor Mcm10, PP2A scaffold PP2A-A during oocyte meiosis, RAG1 during B-cell V(D)J recombination, p53 (via MDM2), the ribosome assembly factor PWP1, and PLK4 to restrain premature centriole duplication [PMID:18332868, PMID:22570418, PMID:26281983, PMID:22157821, PMID:26728942, PMID:33355139, PMID:38490717]. Substrate selection can be encoded by post-translational degrons: a methyl degron generated by EZH2 and read by the DCAF1 chromo domain, or phospho-degrons created by DYRK2 on TERT and AKT on FAM13A [PMID:23063525, PMID:23362280, PMID:23612978, PMID:36749583]. Independent of its ligase function, DCAF1 harbors an intrinsic atypical protein kinase activity that phosphorylates histone H2A at threonine 120 to silence tumor-suppressor and anti-osteoclastogenic genes, and phosphorylates non-histone substrates EZH2 (T367) and p53 (S367) to drive epigenetic gene silencing and p53 destabilization [PMID:24140421, PMID:37069142, PMID:37041410, PMID:39587626]. DCAF1 governs the Hippo pathway downstream of Merlin by ubiquitylating and inhibiting Lats1/2 to promote YAP/TEAD-dependent oncogenic transcription [PMID:25026211, PMID:24912773]. It is essential for proliferation and DNA replication, and its ablation in mice causes early embryonic lethality and selective loss of proliferating cells [PMID:18606781, PMID:33355139]. DCAF1 is constitutively hijacked by HIV-1 Vpr and HIV-2/SIV Vpx, which redirect CRL4(DCAF1) to degrade host restriction factors — including SAMHD1, UNG2, HLTF, Exo1, TET2, SIRT7, and TASOR — and to drive Vpr-induced G2 arrest and PLK4-dependent centrosome amplification [PMID:17314515, PMID:17609381, PMID:18606781, PMID:17620334, PMID:20870715, PMID:29883611, PMID:34699574, PMID:38443376]. The structural basis for this versatility has been defined by crystal structures of DDB1-DCAF1-Vpr-UNG2 and DCAF1-PROTAC ternary complexes, and DCAF1 has been validated as a covalent E3 handle (via Cys1113) for targeted protein degradation [PMID:27571178, PMID:39580491, PMID:36170674].","teleology":[{"year":2001,"claim":"Established DCAF1/VprBP as a direct cellular binding partner of HIV-1 Vpr, defining the first molecular handle on its function.","evidence":"In vitro binding, co-IP, and Vpr nuclear-transport assays with VprBP mutational mapping","pmids":["11223251"],"confidence":"Medium","gaps":["No enzymatic activity assigned","Cellular role beyond Vpr sequestration undefined"]},{"year":2007,"claim":"Resolved how Vpr exerts its cell-cycle effects by showing DCAF1 is the substrate receptor bridging Vpr to the CUL4-DDB1 E3 ligase, with Vpr binding required for G2 arrest and for boosting ligase activity.","evidence":"Co-IP, AP-MS, neddylation assays, siRNA, and Vpr point mutagenesis with G2-arrest readouts across multiple labs","pmids":["17314515","17609381","18606781","17620334"],"confidence":"High","gaps":["Endogenous (non-Vpr) substrates not yet identified","Direct substrate of the G2 arrest unknown"]},{"year":2008,"claim":"Defined DCAF1 architecture within CRL4 and its first endogenous substrate, establishing it as a stoichiometric WD40-domain adaptor with cell-cycle-regulated, chromatin-associated, replication-promoting roles essential for viability.","evidence":"Co-IP, chromatin fractionation, BrdU/cell-cycle assays, conditional mouse KO, and Merlin ubiquitination assays","pmids":["18606781","18332868"],"confidence":"High","gaps":["How chromatin binding directs substrate choice unclear","Degron logic for endogenous substrates undefined"]},{"year":2008,"claim":"Extended the Vpr paradigm to HIV-2/SIV Vpx, showing Vpx also co-opts DCAF1-CUL4 to enable reverse transcription and infection of macrophages.","evidence":"Proteomic pulldown, co-IP, RNAi, and infection assays measuring reverse transcripts in primary macrophages","pmids":["18464893","19264781"],"confidence":"High","gaps":["The restriction factor degraded by Vpx not yet identified at this stage"]},{"year":2010,"claim":"Linked DCAF1 to tumor suppression by showing nuclear Merlin binds and inhibits CRL4(DCAF1), and reconstituted the Vpr-UNG2 substrate-loading mechanism in vitro.","evidence":"Co-IP, nuclear fractionation, expression profiling, tumorigenicity assays, and in vitro reconstituted UNG2 ubiquitination","pmids":["20178741","20870715","20824083"],"confidence":"High","gaps":["Downstream effectors of derepressed CRL4(DCAF1) not yet defined","Mechanism of Merlin-mediated inhibition structurally unresolved"]},{"year":2010,"claim":"Placed DCAF1 in cell-competition biology by identifying the Drosophila ortholog Mahjong as an Lgl partner acting through JNK-dependent apoptosis.","evidence":"Co-IP and Drosophila/MDCK genetics with JNK pathway manipulation","pmids":["20644714"],"confidence":"High","gaps":["Whether ligase or kinase activity mediates competition unclear at this stage"]},{"year":2011,"claim":"Showed CRL4(DCAF1) dimerizes via an N-terminal LisH helix that enhances E3 activity, and identified RAG1 as a CRL4(DCAF1) target required for proper V(D)J recombination.","evidence":"EM, in vitro reconstitution/mutagenesis, and conditional B-cell KO with V(D)J recombination sequencing","pmids":["21226479","22157821"],"confidence":"High","gaps":["Whether RAG1 is a direct ubiquitylation substrate vs. regulated indirectly unresolved","Structural basis of dimer-enhanced catalysis not defined"]},{"year":2012,"claim":"Revealed degron-based substrate recognition by DCAF1, including chromo-domain reading of EZH2-generated methyl degrons and recruitment of replication factor Mcm10 and constitutive UNG2/SMUG1 turnover.","evidence":"Modeling/binding assays with chromo-domain mutagenesis, in vitro methylation and ubiquitination, and degradation assays","pmids":["23063525","22570418","22292079"],"confidence":"Medium","gaps":["Chromo-domain methyl-reading shown for limited substrates","Generality of methyl-degron logic untested"]},{"year":2013,"claim":"Discovered that DCAF1 is a moonlighting protein: an intrinsic atypical kinase phosphorylating nucleosomal H2A-T120 to silence tumor-suppressor genes, and a dual-service receptor also serving the HECT-type EDD/UBR5 ligase to degrade TERT and NuRD adaptors.","evidence":"In vitro nucleosomal kinase assays, ChIP, xenografts, EDD-dependent TERT and ZIP degradation, and review synthesis","pmids":["24140421","23362280","23612978","24028781","24116224"],"confidence":"High","gaps":["Catalytic mechanism of the atypical kinase undefined","How kinase vs. ligase activities are coordinated unclear"]},{"year":2014,"claim":"Defined the Merlin-DCAF1 interface structurally and the oncogenic output of the pathway, and showed CRL4(DCAF1) monoubiquitylates TET enzymes to control DNA hydroxymethylation in development.","evidence":"Crystal structures of Merlin FERM-DCAF1, Lats1/2 ubiquitination/YAP-TEAD epistasis, and oocyte-specific KO with 5hmC imaging","pmids":["24912773","24706749","25026211","25557551"],"confidence":"High","gaps":["How Merlin inhibition is relieved in tumors not fully resolved","Mono- vs. poly-ubiquitylation switching mechanism unclear"]},{"year":2015,"claim":"Connected DCAF1 to meiosis and replication-coupled proteolysis through PP2A-A and ESCO2 degradation, and showed Vpr exploits MCM10 as a natural CRL4(DCAF1) substrate.","evidence":"Oocyte-specific KO with genetic rescue, in vitro ubiquitination, cell synchronization, and Vpr-dependent MCM10 degradation assays","pmids":["26281983","30100344","26032416"],"confidence":"High","gaps":["Degron features distinguishing replication substrates unclear","Coordination with APC/C in ESCO2 turnover not fully defined"]},{"year":2016,"claim":"Established DCAF1 as essential for proliferation in part by restraining p53, defined Vpr/Vpx-DCAF1 binding determinants structurally, and mapped the minimal DCAF1-WD module.","evidence":"Conditional T-cell KO with p53-deletion rescue, DDB1-DCAF1-Vpr-UNG2 crystal structure, DICER1 degradation, and DCAF1-WD mutagenesis","pmids":["26728942","27571178","26965998","24558487"],"confidence":"High","gaps":["Direct p53 ubiquitylation by DCAF1 vs. MDM2-mediated effect distinction","p53-independent growth function uncharacterized at this stage"]},{"year":2018,"claim":"Expanded the Vpr substrate repertoire to HLTF, Exo1, TET2, and CP110, linking DCAF1 hijacking to chromatin remodeling, IL-6-driven viral replication, and centrosomal effects.","evidence":"In vitro reconstitution, mutagenesis, ChIP, conditional KO, and HIV-1 infection assays in T cells","pmids":["29079575","30352932","29883611","29724823"],"confidence":"High","gaps":["Determinants of substrate-loop plasticity not yet structurally defined","Physiological roles of CP110 control outside infection unclear"]},{"year":2020,"claim":"Broadened DCAF1 biology into redox/aging, antioxidant, and growth-factor signaling through GSTP1/ROS control in Tregs, KEAP1-independent NRF2 degradation, and TGF-beta/Activin receptor turnover, and identified essential ribosome-biogenesis control via PWP1.","evidence":"Conditional KO models, ROS assays, co-IP/ubiquitination, zebrafish embryogenesis, and MS substrate ID with ribosome profiling","pmids":["32730228","32171724","31291647","33355139"],"confidence":"High","gaps":["Whether NRF2 and Rheb degradation use CRL4 or kinase activity not always resolved","Tissue-specificity of substrate selection unexplained"]},{"year":2022,"claim":"Defined DCAF1 regulation and druggability, showing AR/OGT and USP2 control its abundance to repress p53, and validating Cys1113 as a covalent handle for PROTAC-based targeted degradation.","evidence":"Knockdown, ChIP-seq, USP2 KO/inhibitor tumor models, and chemical proteomics with C1113A mutagenesis and PROTAC assays","pmids":["35348747","37024504","36170674"],"confidence":"High","gaps":["Mechanism by which DCAF1 represses p53 in prostate cancer (kinase vs. ligase) not fully resolved"]},{"year":2023,"claim":"Consolidated the atypical-kinase axis by showing DCAF1 phosphorylates EZH2-T367 to elevate H3K27me3 and p53-S367 to promote its degradation, defining a kinase-driven epigenetic silencing and tumor-suppressor-restraint program.","evidence":"In vitro kinase assays, phospho-specific antibodies, T367A/S367A mutagenesis, ChIP, organoid and xenograft models, and FAM13A phospho-degron mapping","pmids":["37069142","37041410","36749583"],"confidence":"High","gaps":["Substrate-selection rules of the atypical kinase undefined","Structural basis of the kinase domain unresolved"]},{"year":2024,"claim":"Resolved the dual, opposing relationship between DCAF1 and PLK4/centriole control and the structural plasticity enabling diverse substrate recruitment, while extending DCAF1 to glucose sensing, innate immunity, and HIV latency.","evidence":"AP-MS, reciprocal co-IP, PLK4 mutant/ubiquitination assays, DCAF1-PROTAC-WDR5 crystal structures, and metabolic, IFN, and LTR/NF-kB functional assays","pmids":["38443376","38490717","39580491","38862475","40370558","38905100","39587626"],"confidence":"High","gaps":["How Vpr converts DCAF1-PLK4 from degradation to procentriole recruitment mechanistically unclear","Integration of metabolic vs. immune substrate programs undefined"]},{"year":null,"claim":"How DCAF1 partitions between its CRL4 ligase, EDD/UBR5 ligase, and intrinsic kinase activities — and what governs context-dependent substrate selection across its very broad target list — remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure of the DCAF1 kinase domain or its substrate-recognition mode","No unifying model for switching between ligase and kinase functions","Determinants directing tissue- and signal-specific substrate choice unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[4,9,16,23,27,53]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[18,48,49,58]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[4,5,13,20,57]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[14,18]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[8,31]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[5,8,61]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[5,10,18]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[39,52,53]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[1,5,31,53]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[14,18,23,48]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[1,6,36,52]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[8,22,59]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[9,31,42]}],"complexes":["CRL4(DCAF1) (DDB1-CUL4A-ROC1-DCAF1)","EDD/UBR5 E3 ligase complex","EDD-DYRK2-DDB1(DCAF1) complex"],"partners":["DDB1","CUL4A","NF2","EZH2","TP53","PLK4","UNG2","DYRK2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y4B6","full_name":"DDB1- and CUL4-associated factor 1","aliases":["HIV-1 Vpr-binding protein","VprBP","Serine/threonine-protein kinase VPRBP","Vpr-interacting protein"],"length_aa":1507,"mass_kda":169.0,"function":"Acts both as a substrate recognition component of E3 ubiquitin-protein ligase complexes and as an atypical serine/threonine-protein kinase, playing key roles in various processes such as cell cycle, telomerase regulation and histone modification. Probable substrate-specific adapter of a DCX (DDB1-CUL4-X-box) E3 ubiquitin-protein ligase complex, named CUL4A-RBX1-DDB1-DCAF1/VPRBP complex, which mediates ubiquitination and proteasome-dependent degradation of proteins such as NF2 (PubMed:23063525). Involved in the turnover of methylated proteins: recognizes and binds methylated proteins via its chromo domain, leading to ubiquitination of target proteins by the RBX1-DDB1-DCAF1/VPRBP complex (PubMed:23063525). The CUL4A-RBX1-DDB1-DCAF1/VPRBP complex is also involved in B-cell development: DCAF1 is recruited by RAG1 to ubiquitinate proteins, leading to limit error-prone repair during V(D)J recombination (By similarity). Also part of the EDVP complex, an E3 ligase complex that mediates ubiquitination of proteins such as TERT, leading to TERT degradation and telomerase inhibition (PubMed:19287380, PubMed:23362280). The EDVP complex also mediates ubiquitination and degradation of CCP110 (PubMed:28242748, PubMed:34259627). Also acts as an atypical serine/threonine-protein kinase that specifically mediates phosphorylation of 'Thr-120' of histone H2A (H2AT120ph) in a nucleosomal context, thereby repressing transcription (PubMed:24140421). H2AT120ph is present in the regulatory region of many tumor suppresor genes, down-regulates their transcription and is present at high level in a number of tumors (PubMed:24140421). Involved in JNK-mediated apoptosis during cell competition process via its interaction with LLGL1 and LLGL2 (PubMed:20644714). By acting on TET dioxygenses, essential for oocyte maintenance at the primordial follicle stage, hence essential for female fertility (By similarity) (Microbial infection) In case of infection by HIV-1 virus, it is recruited by HIV-1 Vpr in order to hijack the CUL4A-RBX1-DDB1-DCAF1/VPRBP function leading to arrest the cell cycle in G2 phase, and also to protect the viral protein from proteasomal degradation by another E3 ubiquitin ligase. The HIV-1 Vpr protein hijacks the CUL4A-RBX1-DDB1-DCAF1/VPRBP complex to promote ubiquitination and degradation of proteins such as TERT and ZIP/ZGPAT (Microbial infection) In case of infection by HIV-2 virus, it is recruited by HIV-2 Vpx in order to hijack the CUL4A-RBX1-DDB1-DCAF1/VPRBP function leading to enhanced efficiency of macrophage infection and promotion of the replication of cognate primate lentiviruses in cells of monocyte/macrophage lineage","subcellular_location":"Cytoplasm; Nucleus; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome","url":"https://www.uniprot.org/uniprotkb/Q9Y4B6/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/DCAF1","classification":"Common Essential","n_dependent_lines":74,"n_total_lines":74,"dependency_fraction":1.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CAPZB","stoichiometry":0.2},{"gene":"CLTA","stoichiometry":0.2},{"gene":"DDB1","stoichiometry":0.2},{"gene":"HSPA4","stoichiometry":0.2},{"gene":"MTMR1","stoichiometry":0.2},{"gene":"SRP14","stoichiometry":0.2},{"gene":"TRIM28","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/DCAF1","total_profiled":1310},"omim":[{"mim_id":"620886","title":"tRNA METHYLTRANSFERASE 6, NONCATALYTIC SUBUNIT; TRMT6","url":"https://www.omim.org/entry/620886"},{"mim_id":"620885","title":"tRNA METHYLTRANSFERASE 61A; TRMT61A","url":"https://www.omim.org/entry/620885"},{"mim_id":"617259","title":"DDB1- AND CUL4-ASSOCIATED FACTOR 1; DCAF1","url":"https://www.omim.org/entry/617259"},{"mim_id":"610617","title":"DENTICLELESS E3 UBIQUITIN PROTEIN LIGASE HOMOLOG; DTL","url":"https://www.omim.org/entry/610617"},{"mim_id":"609455","title":"PROLINE-, GLUTAMIC ACID-, AND LEUCINE-RICH PROTEIN 1; PELP1","url":"https://www.omim.org/entry/609455"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Nucleoli fibrillar center","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"testis","ntpm":47.6}],"url":"https://www.proteinatlas.org/search/DCAF1"},"hgnc":{"alias_symbol":["KIAA0800","MGC102804"],"prev_symbol":["VPRBP"]},"alphafold":{"accession":"Q9Y4B6","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y4B6","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y4B6-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y4B6-F1-predicted_aligned_error_v6.png","plddt_mean":74.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DCAF1","jax_strain_url":"https://www.jax.org/strain/search?query=DCAF1"},"sequence":{"accession":"Q9Y4B6","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y4B6.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y4B6/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y4B6"}},"corpus_meta":[{"pmid":"20178741","id":"PMC_20178741","title":"Merlin/NF2 suppresses tumorigenesis by inhibiting the E3 ubiquitin ligase CRL4(DCAF1) in 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Co-expression of VprBP sequesters Vpr in the cytoplasm, blocking its nuclear transport.\",\n      \"method\": \"In vitro binding assay with recombinant proteins, co-immunoprecipitation, subcellular fractionation, adenoviral expression, Vpr-GFP nuclear transport assay, VprBP mutational analysis\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal binding confirmed in vitro and in vivo, mutational mapping, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"11223251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"DCAF1/VprBP serves as the substrate receptor bridging HIV-1 Vpr to the Cul4-DDB1 ubiquitin ligase complex; this interaction is essential for Vpr-induced G2 cell cycle arrest, which is abolished by single Vpr mutations impairing DCAF1 binding or by siRNA-mediated DCAF1 silencing.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, cell cycle analysis (G2 arrest assay), point mutagenesis of Vpr\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — independently replicated across multiple labs, reciprocal Co-IP, functional rescue by siRNA and mutagenesis\",\n      \"pmids\": [\"17314515\", \"17609381\", \"18606781\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Vpr binding to the VprBP subunit of the Cul4-DDB1[VprBP] E3 complex increases neddylation and intrinsic ubiquitin ligase activity of this E3. VprBP also has an independent role in regulating G1 phase and is required for completion of DNA replication in S phase.\",\n      \"method\": \"Affinity purification/mass spectrometry, co-immunoprecipitation, neddylation assay, siRNA knockdown with cell cycle analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS interactome plus functional assays in single lab\",\n      \"pmids\": [\"17609381\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"HIV-1 Vpr engages the DDB1- and CUL4A-containing ubiquitin ligase complex through VprBP/DCAF1; both the Vpr–VprBP interaction and assembly of the full ubiquitin ligase are necessary for Vpr-mediated G2 arrest.\",\n      \"method\": \"Co-immunoprecipitation, tandem mass spectrometry, functional G2 arrest assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — replicated across labs with reciprocal Co-IP and functional validation\",\n      \"pmids\": [\"17620334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"DCAF1/VprBP functions as the substrate adaptor that recruits Merlin (NF2) to the Roc1-Cul4A-DDB1 E3 ligase complex for polyubiquitination and proteasome-mediated degradation following serum stimulation; VprBP depletion stabilizes Merlin and inhibits ERK and Rac1 activation.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, ubiquitination assay, western blot for ERK/Rac activation\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and ubiquitination assay, functional pathway readout, single lab\",\n      \"pmids\": [\"18332868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"VprBP/DCAF1 binds stoichiometrically with DDB1 through its WD40 domain and through DDB1 to CUL4A; steady-state VprBP decreases during mitosis, and VprBP binds chromatin in a DDB1-independent, cell cycle-dependent manner (peaks in G2). Silencing VprBP reduces DNA replication rate, blocks S-phase progression, and VprBP ablation in mice causes early embryonic lethality.\",\n      \"method\": \"Co-immunoprecipitation, chromatin fractionation, cell cycle synchronization, siRNA knockdown, BrdU incorporation, conditional mouse knockout\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (biochemical, cell biology, genetic mouse model) in single rigorous study\",\n      \"pmids\": [\"18606781\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"HIV-2/SIVmac Vpx associates with VprBP/DCAF1 and the Cullin 4 E3 complex; this interaction is required for efficient reverse transcription of SIVmac in primary macrophages. Depletion of VprBP by RNAi renders macrophages resistant to SIVmac infection.\",\n      \"method\": \"Biochemical and proteomic pulldown, co-immunoprecipitation, siRNA knockdown, infection assay measuring reverse transcripts\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — MS interactome, reciprocal Co-IP, functional rescue in primary cells, replicated by multiple labs\",\n      \"pmids\": [\"18464893\", \"19264781\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"HIV-2 Vpx assembles with CUL4A-DDB1 through DCAF1 recruitment; preventing Vpx from recruiting DCAF1 in target macrophages causes a post-entry block with defective accumulation of reverse transcripts, and SIVsm Vpx functionally complements Vpx-defective HIV-2 in a DCAF1-binding-dependent manner.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, viral infection assay, reverse transcription quantification\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal functional assays, replicated across labs\",\n      \"pmids\": [\"19264781\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Merlin (NF2 tumor suppressor) in its closed growth-inhibitory form translocates to the nucleus, directly binds CRL4(DCAF1), and suppresses its E3 ubiquitin ligase activity. DCAF1 depletion blocks the pro-mitogenic effect of Merlin inactivation; tumor-derived mutations disrupt Merlin–DCAF1 interaction.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, nuclear fractionation, gene expression profiling, schwannoma cell proliferation assays, tumor cell line tumorigenicity assays\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods, functional epistasis, disease-relevant mutations tested, replicated in multiple cell types\",\n      \"pmids\": [\"20178741\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"HIV-1 Vpr loads UNG2 onto DCAF1 forming a heterotrimeric VprBP–Vpr–UNG2 complex in vitro and in vivo; reconstituted CRL4(DCAF1-Vpr) E3 ubiquitin ligase ubiquitinates UNG2 in vitro, and co-expression of DCAF1 with Vpr causes proteasome-dependent UNG2 degradation.\",\n      \"method\": \"In vitro reconstitution with recombinant proteins, in vitro ubiquitination assay, co-immunoprecipitation, proteasome inhibitor rescue\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of ubiquitination, replicated across labs\",\n      \"pmids\": [\"20870715\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Vpr forms mobile chromatin-associated nuclear foci containing VPRBP/DCAF1; Vpr associates with chromatin via its C-terminal domain and forms a complex with VPRBP on chromatin. These nuclear foci are required for G2 arrest; VPRBP depletion does not prevent foci formation but does prevent G2 arrest.\",\n      \"method\": \"Immunofluorescence, confocal microscopy, time-lapse microscopy, chromatin fractionation, co-immunoprecipitation, siRNA knockdown\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct imaging and biochemical fractionation, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"20824083\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Mahjong/VprBP (Drosophila ortholog of DCAF1) is a novel binding partner of Lgl (lethal giant larvae) in both flies and mammals; mahj mutant cells undergo apoptosis when surrounded by wild-type cells via the JNK pathway, establishing that Mahjong and Lgl function in the same pathway to regulate cellular competitiveness.\",\n      \"method\": \"Biochemical immunoprecipitation, Drosophila genetics (wing disc analysis), RNAi knockdown in MDCK cells, JNK pathway inhibition\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, in vivo genetic epistasis in Drosophila, mammalian cell confirmation, multiple orthogonal methods\",\n      \"pmids\": [\"20644714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CRL4-DCAF1 complex dimerizes via a short helical region (residues 845–873, designated LisH motif) N-terminal to DCAF1's WD40 domain; four Leu residues in this helix are essential for oligomerization. Dimeric CRL4(DCAF1) is more active as an E3 ligase for UNG2 ubiquitination in vitro than monomeric complex.\",\n      \"method\": \"Electron microscopy, in vitro reconstitution, in vitro ubiquitination assay, mutagenesis of oligomerization helix\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — EM structure, in vitro reconstitution, mutagenesis in single rigorous study\",\n      \"pmids\": [\"21226479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"VprBP/DCAF1 associates with full-length RAG1 through a multi-subunit CRL4 complex (VprBP/DDB1/Cul4A/Roc1); conditional B-lineage VprBP disruption arrests B-cell development at the pro-B to pre-B transition with severely impaired V(D)J recombination and increased error-prone repair.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitylation, conditional B-cell specific knockout mouse, flow cytometry, V(D)J recombination assay, sequencing of coding joints\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, in vitro ubiquitylation, in vivo conditional knockout with defined cellular phenotypes\",\n      \"pmids\": [\"22157821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"DCAF1's putative chromo domain directly recognizes monomethylated substrates generated by EZH2; mutations in the DCAF1 chromo domain binding pocket abolish binding to monomethylated substrates. EZH2 methylates RORα, creating a methyl degron recognized by DCAF1/DDB1/CUL4 for ubiquitin-mediated degradation.\",\n      \"method\": \"Molecular modeling, binding affinity assays, mutagenesis of DCAF1 chromo domain, in vitro methylation assay, ubiquitination assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — binding assay with mutagenesis, in vitro methylation and ubiquitination, single lab\",\n      \"pmids\": [\"23063525\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"A conserved Wx4Φx2Φx3AΦxH motif in SIVmac Vpx and HIV-1 Vpr is required for DCAF1 interaction and Vpx-mediated SAMHD1 degradation. DCAF1 and SAMHD1 interactions in Vpx involve distinct interfaces; VpxW24A mutants still bind DCAF1 and SAMHD1 but cannot trigger SAMHD1 degradation.\",\n      \"method\": \"Mutational analysis, co-immunoprecipitation, SAMHD1 degradation assay, viral infection assay\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic mutagenesis with functional readouts, single lab\",\n      \"pmids\": [\"22776683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CRL4-DDB1-VprBP/DCAF1 ubiquitin ligase mediates stress-induced (UV) proteolysis of the DNA replication factor Mcm10; VprBP is the substrate recognition subunit that targets Mcm10. The purified Cul4-Roc1-DDB1 complex ubiquitinates Mcm10 in vitro.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, siRNA knockdown, UV irradiation assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstituted ubiquitination, functional genetic knockdown, single lab with multiple methods\",\n      \"pmids\": [\"22570418\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"DCAF1/VprBP constitutively targets UNG2 and SMUG1 for CRL4(DCAF1)-mediated degradation independently of Vpr; UNG2 assembles with the ubiquitin ligase complex in the absence of Vpr, but Vpr enhances this interaction at low Vpr concentrations while high Vpr concentrations block UNG2 depletion.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, proteasome inhibitor rescue, cell fractionation\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dose-dependent mechanistic analysis with multiple readouts, single lab\",\n      \"pmids\": [\"22292079\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"VprBP/DCAF1 possesses intrinsic protein kinase activity and phosphorylates histone H2A on threonine 120 (H2AT120) in a nucleosomal context; VprBP localizes to tumor suppressor gene loci and blocks their transcription in a kinase-activity-dependent manner.\",\n      \"method\": \"In vitro kinase assay with nucleosomes, mutagenesis of kinase domain, ChIP, RNAi knockdown, small-molecule inhibitor studies, xenograft tumor growth\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase reconstitution with nucleosomes, mutagenesis, ChIP, and in vivo tumor model\",\n      \"pmids\": [\"24140421\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Dyrk2 phosphorylates TERT, creating a phospho-degron recognized by the EDD-DDB1-VprBP/DCAF1 E3 ligase complex, leading to TERT ubiquitination and degradation; this regulation is cell cycle-dependent (G2/M phase) and telomerase activity is constitutively elevated upon Dyrk2 depletion.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, ubiquitination assay, siRNA knockdown, telomerase activity assay, cell cycle synchronization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay plus ubiquitination, functional telomerase readout, single lab with multiple methods\",\n      \"pmids\": [\"23362280\", \"23612978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"VprBP/DCAF1 serves as a substrate recognition subunit for both the RING-type CRL4 ligase and the HECT-type EDD/UBR5 ligase, representing an unusual dual-service substrate receptor.\",\n      \"method\": \"Review synthesizing biochemical and proteomic data from primary studies (co-immunoprecipitation, mass spectrometry)\",\n      \"journal\": \"BMC molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — synthesis of multiple primary experimental studies, not new experiments in this paper\",\n      \"pmids\": [\"24028781\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"HIV-1 Vpr induces degradation of ZIP and sZIP (NuRD complex adaptors) by hijacking DCAF1; ZIP/sZIP degradation requires proteasome activity and is abolished by a DCAF1-binding-deficient Vpr mutant or DCAF1 siRNA knockdown. Vpr co-localizes with Cul4A ligase subunits exclusively on chromatin.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, proteasome inhibitor rescue, cellular fractionation\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal approaches (genetic, pharmacological, fractionation), single lab\",\n      \"pmids\": [\"24116224\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Derepressed CRL4(DCAF1) promotes YAP/TEAD-dependent transcription by ubiquitylating and inhibiting Lats1 and Lats2 in the nucleus; genetic epistasis experiments confirm this signaling axis sustains oncogenicity of Merlin-deficient tumor cells.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, genetic epistasis (double knockdown/overexpression), YAP/TEAD reporter assay, analysis of NF2-mutant tumor samples\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, ubiquitination assay, epistasis, disease sample validation, replicated concept from prior lab work\",\n      \"pmids\": [\"25026211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CRL4(VprBP/DCAF1) monoubiquitylates all three TET dioxygenases on a conserved lysine (K1299 for TET2), promoting TET chromatin binding; deletion of VprBP in oocytes abrogates paternal DNA hydroxymethylation in zygotes. Leukemia-derived TET2 inactivating mutations target either the monoubiquitylation site or VprBP-binding residues.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, conditional oocyte-specific VprBP knockout mouse, 5hmC immunofluorescence, mutational analysis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution, conditional genetic KO in mouse, disease mutation validation, multiple orthogonal methods\",\n      \"pmids\": [\"25557551\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Crystal structure of the Merlin FERM domain bound to the DCAF1 C-terminal acidic tail reveals that the hydrophobic IILXLN motif of DCAF1 binds subdomain C of the FERM domain as a β-strand; CD44 cytoplasmic tail competes with DCAF1 for binding to the same Merlin FERM binding groove.\",\n      \"method\": \"X-ray crystallography, competition binding assay\",\n      \"journal\": \"Genes to cells : devoted to molecular & cellular mechanisms\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus competition binding assay, single lab\",\n      \"pmids\": [\"24912773\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Crystal structure of the Merlin FERM domain in complex with DCAF1 binding domain reveals that the Merlin-FERM binding domain of DCAF1 folds as a β-hairpin and binds the α1/β5-groove of the F3 lobe via extensive hydrophobic interactions.\",\n      \"method\": \"X-ray crystallography\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure, corroborated by independent structural study\",\n      \"pmids\": [\"24706749\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The minimal DCAF1-WD domain (residues 1041–1393) retains Vpr and DDB1 binding; an α-helical H-box motif and F/YxxF/Y motifs in the N-terminal portion of DCAF1-WD are required exclusively for DDB1 binding; Vpr binding to DCAF1 modulates DDB1/DCAF1 complex formation, and expression of DCAF1-WD alone is insufficient for Vpr-mediated G2 arrest.\",\n      \"method\": \"Mutagenesis, co-immunoprecipitation, G2 arrest functional assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic mutagenesis with co-IP and functional readout, single lab\",\n      \"pmids\": [\"24558487\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CRL4-DCAF1 controls oocyte meiotic maturation by directing proteasomal degradation of PP2A scaffold subunit PP2A-A; oocyte-specific deletion of DDB1 or DCAF1 causes PP2A-A accumulation and meiosis failure; combined deletion of Ppp2r1a rescues meiotic defects.\",\n      \"method\": \"Oocyte-specific conditional knockout mouse, in vitro ubiquitination assay (DCAF1 directly ubiquitinates PP2A-A), genetic rescue (double KO), western blot\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro ubiquitination reconstitution, conditional genetic KO, genetic epistasis rescue, multiple orthogonal methods\",\n      \"pmids\": [\"26281983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"HIV-1 Vpr indirectly binds MCM10 (DNA replication factor) in a VprBP-dependent manner; Vpr enhances ubiquitination and proteasomal degradation of MCM10, and this correlates with Vpr-induced G2/M arrest. MCM10 is identified as a natural substrate of Cul4-DDB1[VprBP].\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, proteasome inhibitor rescue, G2/M arrest analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ubiquitination assay with functional correlation, single lab\",\n      \"pmids\": [\"26032416\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Lgl associates with the VprBP-DDB1 complex independently of the PAR-aPKC complex and prevents VprBP-DDB1 from binding CUL4A, thereby inhibiting CRL4[VprBP] E3 ligase activity. aPKC-mediated phosphorylation of Lgl2 negatively regulates Lgl2–VprBP-DDB1 interaction; depletion of VprBP or Cul4 rescues overproliferation of Lgl-depleted cells.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, cell proliferation assay, phosphomimetic mutant analysis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, genetic rescue, phosphoregulation analysis, single lab\",\n      \"pmids\": [\"25947136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Crystal structure of the DDB1-DCAF1-HIV-1 Vpr-UNG2 complex reveals how Vpr engages DCAF1 and creates a new binding surface for UNG2 recruitment via molecular mimicry of DNA by a Vpr variable loop; Vpr and Vpx use similar N-terminal/helical regions to bind DCAF1 but different regions to recruit their specific substrates.\",\n      \"method\": \"X-ray crystallography\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution crystal structure of quaternary complex\",\n      \"pmids\": [\"27571178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DCAF1 is essential for T-cell growth, cell cycle entry, and proliferation upon activation; DCAF1 deletion stabilizes p53 protein by impairing MDM2-mediated p53 poly-ubiquitination, and p53 deletion rescues the cell cycle defect but not the growth defect of DCAF1-deficient T cells.\",\n      \"method\": \"Conditional T-cell-specific DCAF1 knockout mouse, flow cytometry, western blot, genetic rescue (p53 deletion), ubiquitination assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional in vivo KO with epistasis rescue, ubiquitination assay, multiple orthogonal methods\",\n      \"pmids\": [\"26728942\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CUL4A(DCAF1) E3 ubiquitin ligase targets DICER1 for proteasomal degradation in response to Jak-STAT3 pathway activation; PI3K-AKT-mediated phosphorylation of DICER1 contributes to its degradation by this complex.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, ubiquitination assay, xenograft tumor model\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ubiquitination assay with phosphorylation involvement, single lab\",\n      \"pmids\": [\"26965998\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"VprBP/DCAF1 promotes FoxM1 ubiquitylation and degradation via CRL4; paradoxically, VprBP also activates FoxM1 transcription through a ligase-independent mechanism. VprBP binding to CRL4 is reduced during mitosis, and VprBP activation of FoxM1 is independent of ubiquitin ligase function.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, FoxM1 transcriptional reporter assay, cell synchronization, siRNA knockdown\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional assays separating proteolytic vs. non-proteolytic activities, single lab\",\n      \"pmids\": [\"28416635\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Zinc coordination via a conserved zinc-binding motif in Vpx and Vpr is required for CRL4(DCAF1) E3 ligase assembly and DCAF1 interaction; zinc chelation by TPEN selectively inhibits Vpx/Vpr–DCAF1 binding and blocks SAMHD1/HLTF degradation and viral infection, without affecting Vpx–SAMHD1 interaction.\",\n      \"method\": \"Co-immunoprecipitation, mutagenesis of zinc-binding motif, zinc chelation (TPEN treatment), SAMHD1/HLTF degradation assays, viral infection assay\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic mutagenesis, pharmacological disruption, multiple functional readouts, single lab\",\n      \"pmids\": [\"28202763\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"HIV-1 Vpr directly loads HLTF onto the C-terminal WD40 domain of DCAF1 in the CRL4 complex for polyubiquitination; Vpr interacts with DNA-binding residues in the HIRAN domain of HLTF (similar to UNG2 recruitment) and additionally engages a second region connecting the HIRAN and ATPase/helicase domains.\",\n      \"method\": \"In vitro reconstitution ubiquitination assay, mutational analysis, co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with mutagenesis, single lab\",\n      \"pmids\": [\"29079575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HIV-1 Vpr targets TET2 for polyubiquitylation by the VprBP-DDB1-CUL4-ROC1 E3 ligase and subsequent proteasomal degradation; Vpr-mediated TET2 degradation sustains IL-6 expression by reducing HDAC1/2 recruitment to the IL-6 promoter, enhancing H3K27 acetylation, thereby promoting HIV-1 replication.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, conditional TET2 knockout, chromatin immunoprecipitation, IL-6 ELISA, viral replication assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of ubiquitination, ChIP mechanistic data, genetic KO with functional rescue, multiple orthogonal methods\",\n      \"pmids\": [\"29883611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HIV-1 Vpr recruits Exo1 (exonuclease 1) to the CRL4DCAF1 E3 complex for ubiquitination and proteasomal degradation; Exo1 inhibits HIV-1 replication in T cells, and antagonism of Exo1 is conserved across main group HIV-1 and SIVcpz Vpr proteins.\",\n      \"method\": \"Focused substrate screen, co-immunoprecipitation, ubiquitination assay, HIV replication assay with Exo1 knockdown/overexpression, evolutionary conservation analysis\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ubiquitination assay plus functional viral replication readout, single lab\",\n      \"pmids\": [\"30352932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CUL4-DDB1-VPRBP E3 ubiquitin ligase complex promotes post-replicative ESCO2 degradation in late S phase; ESCO2 physically interacts with the complex and its degradation requires both CUL4-DDB1-VPRBP and the anaphase-promoting complex.\",\n      \"method\": \"Co-immunoprecipitation, cell synchronization, proteasome inhibitor rescue, siRNA knockdown\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with cell cycle synchronization and genetic knockdown, single lab\",\n      \"pmids\": [\"30100344\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Vpr localizes to the centrosome through DCAF1, forming a complex with EDD-DYRK2-DDB1(DCAF1) and Cep78; Vpr enhances ubiquitination of CP110 (an EDD substrate) leading to its degradation, causing centriole elongation and increased microtubule nucleation. Infection with HIV-1 (but not Vpr-deleted HIV-1) promotes CP110 degradation in T lymphocytes.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence/confocal microscopy, ubiquitination assay, HIV-1 infection assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, imaging, ubiquitination assay, primary cell infection, single lab\",\n      \"pmids\": [\"29724823\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DCAF1 is downregulated in aged Tregs and restrains Treg aging via reactive oxygen species regulated by GSTP1 (glutathione-S-transferase P); the DCAF1/GSTP1/ROS axis controls Treg senescence, proliferation, and suppressive function.\",\n      \"method\": \"Conditional T-cell-specific DCAF1 knockout mouse, ROS assays, inflammatory bowel disease model, irradiation-induced aging model, GSTP1 inhibition experiments\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional in vivo KO with multiple in vivo functional models and pathway epistasis\",\n      \"pmids\": [\"32730228\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DCAF1 targets NRF2 for proteasomal degradation in a KEAP1-independent manner; DCAF1 directly interacts with NRF2, and small molecule BC-1901S disrupts NRF2/DCAF1 interaction to stabilize NRF2.\",\n      \"method\": \"High-throughput screening, co-immunoprecipitation, ubiquitination assay, NRF2 stability assay, anti-oxidant gene expression\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with ubiquitination assay and pharmacological disruption, single lab\",\n      \"pmids\": [\"32171724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DCAF1 loss in multiple tissues selectively eliminates proliferating cells and causes perinatal lethality, thymic atrophy, and bone marrow defects; DCAF1 targets ribosome assembly factor PWP1 for degradation — DCAF1 loss causes PWP1 accumulation that impairs rRNA processing and ribosome biogenesis, leading to free RPL11 increase and L11-MDM2 association with p53 activation.\",\n      \"method\": \"Conditional tissue-specific knockout mice (multiple tissues), inducible KO in T cells and MEFs, mass spectrometry substrate identification, ribosome profiling, ubiquitination assay, siRNA/overexpression rescue experiments\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple tissue conditional KOs, MS substrate identification, rescue epistasis experiments, multiple orthogonal methods\",\n      \"pmids\": [\"33355139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"HIV-1 Vpr mediates poly-ubiquitination and degradation of SIRT7 (histone H3 deacetylase) via CRL4-DCAF1; in vitro reconstitution assays confirm Vpr-induced SIRT7 polyubiquitination. SIRT7 degradation by Vpr is conserved across multiple HIV-1 strains (not HIV-2) and is independent of the Vpr-induced G2 arrest phenotype.\",\n      \"method\": \"In vitro reconstitution ubiquitination assay, co-immunoprecipitation, proteasome inhibitor rescue, Vpr mutant analysis\",\n      \"journal\": \"Virology journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of ubiquitination with controls, strain panel tested, single lab\",\n      \"pmids\": [\"33648539\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"HIV-2 Vpx bridges SAMHD1 to DCAF1 for degradation, while TASOR (HUSH complex component) interacts with DCAF1 independently of Vpx; Vpx stabilizes the TASOR–DCAF1 association. TASOR degradation requires a robust Vpx–DCAF1 interaction mediated by TASOR's N-terminal PARP-like domain.\",\n      \"method\": \"Co-immunoprecipitation, Vpx mutagenesis, TASOR/SAMHD1 degradation assays in macrophages\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic mutant analysis separating two substrate pathways, primary cell validation, single lab\",\n      \"pmids\": [\"34699574\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Electrophilic azetidine acrylamides stereoselectively and site-specifically react with Cys1113 (C1113) in DCAF1; this covalent modification supports PROTAC-mediated targeted protein degradation in human cells. A C1113A DCAF1 mutant abolishes PROTAC activity, and only low fractional DCAF1 engagement is required for degradation.\",\n      \"method\": \"Chemical proteomics (activity-based protein profiling), DCAF1 C1113A mutagenesis, PROTAC cell-based degradation assay, stereochemical profiling\",\n      \"journal\": \"Journal of the American Chemical Society\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — chemical proteomics site identification, functional mutagenesis validation, cell-based mechanism studies, single rigorous study\",\n      \"pmids\": [\"36170674\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DCAF1 is regulated by the androgen receptor (AR) at the transcript level and stabilized by OGT at the protein level; DCAF1 knockdown in prostate cancer cells increases p53 stabilization and nucleolar fragmentation, restraining p53 activation downstream of AR and OGT.\",\n      \"method\": \"siRNA knockdown, western blot, flow cytometry, ChIP-seq, clinical sample correlation\",\n      \"journal\": \"Molecular cancer research : MCR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockdown with mechanistic protein-level readouts, single lab\",\n      \"pmids\": [\"35348747\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Mahjong/DCAF1 loss in Drosophila cells triggers Xrp1 bZip transcription factor expression, which activates JNK signaling, autophagosome accumulation, eIF2α phosphorylation, and reduced translation — this pathway is independent of apical-basal polarity and couples DCAF1 to protein turnover/cell competition.\",\n      \"method\": \"Drosophila genetics (mahj, ddb1, cul4 mutants), epistasis analysis with xrp1, JNK pathway reporters, translation assays\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo genetic epistasis in Drosophila, multiple pathway readouts, single lab\",\n      \"pmids\": [\"36278853\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"VprBP/DCAF1 kinase phosphorylates EZH2 at T367, augmenting its nuclear stabilization and methyltransferase activity; DCAF1-mediated EZH2 T367 phosphorylation elevates H3K27me3 levels and silences growth-regulatory genes in colon cancer cells. EZH2 requires this phosphorylation for its oncogenic function in organoid and xenograft models.\",\n      \"method\": \"In vitro kinase assay, phospho-specific antibody, mutagenesis (T367A), ChIP, organoid model, xenograft model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay with mutagenesis, ChIP mechanistic readout, in vivo preclinical models, single rigorous study\",\n      \"pmids\": [\"37069142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"VprBP/DCAF1 phosphorylates p53 at serine 367 (S367) through a direct interaction with p53's C-terminal domain; S367 phosphorylation promotes p53 proteasomal degradation and suppresses p53 transcriptional activity. p53 acetylation abrogates VprBP–p53 interaction and prevents S367 phosphorylation during DNA damage response.\",\n      \"method\": \"In vitro kinase assay, phospho-specific antibody, p53 S367A/S367E mutagenesis, co-immunoprecipitation, western blot stability assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay with mutagenesis, co-IP regulatory mechanism, single rigorous study\",\n      \"pmids\": [\"37041410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"USP2 deubiquitinase stabilizes VPRBP/DCAF1 protein; VPRBP is a potent p53 repressor whose stability is controlled by USP2. VPRBP also regulates PD-L1 expression, and USP2 inhibition combined with anti-PD1 leads to complete tumor regression in wild-type p53 tumors.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, USP2 inhibitor treatment, Usp2 knockout mouse, tumor regression assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ubiquitination assay with in vivo genetic KO and functional tumor readout, single lab\",\n      \"pmids\": [\"37024504\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"AKT phosphorylates FAM13A at serine 312, which is then recognized by the CUL4A/DCAF1 E3 ligase complex, leading to FAM13A ubiquitination and proteasomal degradation.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, phosphomimetic/phosphodeficient mutagenesis, in vivo lung injury models\",\n      \"journal\": \"American journal of respiratory cell and molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ubiquitination with phosphomutant analysis, in vivo validation, single lab\",\n      \"pmids\": [\"36749583\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Vpr forms a cooperative ternary complex with VprBP/DCAF1 and PLK4 (polo-like kinase 4); this complex promotes PLK4 relocalization to the procentriole assembly and induces centrosome amplification and aneuploidy in CD4+ T cells. The VprBP acidic region and Vpr C-terminal 17 residues are both required for PLK4 binding.\",\n      \"method\": \"Affinity purification, co-immunoprecipitation, biochemical reconstitution, confocal microscopy, Vpr deletion mutagenesis, primary CD4+ T cell infection assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — affinity purification-MS, reciprocal Co-IP, mutagenesis, primary cell biology, multiple orthogonal methods in single study\",\n      \"pmids\": [\"38443376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CRL4DCAF1 E3 ubiquitin ligase targets PLK4 for ubiquitylation and degradation in G2 phase to prevent premature centriole duplication; DCAF1 interaction with PLK4 is mediated by PLK4 polo-boxes 1 and 2 and is independent of PLK4 kinase activity, distinguishing it from SCFβ-TrCP-mediated PLK4 regulation.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, PLK4 mutant analysis, cell cycle analysis\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ubiquitination with mutagenesis separating pathways, single lab\",\n      \"pmids\": [\"38490717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Glucose deprivation transactivates DCAF1 expression, which then promotes K48-linked polyubiquitination and proteasomal degradation of Rheb, inhibiting mTORC1 activity and inducing autophagy to promote cancer cell survival; DCAF1 is identified as a cellular glucose sensor.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay (K48-linkage specific), DCAF1 knockdown/overexpression, mTORC1 activity assay, autophagy assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with ubiquitination assay and functional pathway readouts, single lab\",\n      \"pmids\": [\"38862475\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DOT1L-mediated H3K79me2 recruits DCAF1 to the HIV-1 LTR; upon TNF-α/NF-κB activation, DCAF1 at the LTR ubiquitinates NF-κB and restricts its accumulation at the viral promoter, constituting a feedback repression of HIV reactivation.\",\n      \"method\": \"Peptide affinity purification, proteomics, co-immunoprecipitation, ChIP, siRNA knockdown, HIV-1 reactivation assay\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — affinity purification-MS, ChIP, Co-IP, functional viral readout, single lab\",\n      \"pmids\": [\"38905100\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"STK39 kinase interacts with PPP2R1A (PP2A scaffold subunit) in a kinase-activity-dependent manner and inhibits DCAF1-mediated PPP2R1A degradation, thereby stabilizing PP2A, which suppresses IRF3 phosphorylation and type I interferon production to promote viral immune escape.\",\n      \"method\": \"Mass spectrometry, co-immunoprecipitation, siRNA knockdown, interferon reporter assay, PP2A phosphatase activity assay, in vivo viral infection model\",\n      \"journal\": \"Acta pharmaceutica Sinica. B\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS-identified interaction, Co-IP, functional immune readout, in vivo model, single lab\",\n      \"pmids\": [\"40370558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Crystal structures of DCAF1-PROTAC-WDR5 ternary complexes at high resolution reveal that DCAF1 loops provide surface plasticity for substrate recruitment, enabling DCAF1 to accommodate diverse substrates as an E3 ligase substrate receptor.\",\n      \"method\": \"X-ray crystallography of ternary complexes, PROTAC-mediated WDR5 degradation assay in cells\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple high-resolution crystal structures with functional cellular validation, single study\",\n      \"pmids\": [\"39580491\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"VprBP/DCAF1 stimulates RANKL-induced osteoclast differentiation by phosphorylating H2AT120 to suppress anti-osteoclastogenic genes; abrogating VprBP kinase activity toward H2AT120 blocks osteoclast differentiation in vitro and in vivo.\",\n      \"method\": \"In vitro kinase assay, VprBP kinase-dead mutant, RANKL-induced osteoclast differentiation assay, in vivo bone loss model, ChIP\",\n      \"journal\": \"Epigenetics & chromatin\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay with mutagenesis, in vivo model, ChIP, single lab\",\n      \"pmids\": [\"39587626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"VprBP negatively regulates TGF-β and Activin signaling by promoting Smad7-Smurf1-TβRI complex formation, inducing proteasomal degradation of TGF-β type I receptor (TβRI), and stabilizing Smurf1 by suppressing its poly-ubiquitination; VprBP was identified as a novel Smad7 binding partner.\",\n      \"method\": \"Proteomic interaction screen, co-immunoprecipitation, ubiquitination assay, TGF-β signaling (Smad2 phosphorylation, Smad2-Smad4 interaction), zebrafish embryogenesis assay\",\n      \"journal\": \"Journal of molecular cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomics-identified interaction, Co-IP, ubiquitination assay, in vivo zebrafish model, single lab\",\n      \"pmids\": [\"31291647\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Autophagy selectively targets VPRBP/DCAF1 for degradation via the LC3B-p62 receptor pathway; VPRBP is a novel LC3B-binding protein, and induction of autophagy reduces VPRBP levels in a manner rescuable by autophagy inhibitors.\",\n      \"method\": \"GST-LC3B pulldown combined with LC-MS/MS, co-immunoprecipitation (VPRBP-LC3/p62 complex), autophagy induction/inhibition with BFA1 and ATG5 knockdown\",\n      \"journal\": \"Clinical science (London, England : 1979)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS-identified LC3B interaction, Co-IP, functional autophagy assay, single lab\",\n      \"pmids\": [\"22963397\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The carboxyl-terminal ED-rich region (1312–1417) of DCAF1 is required for nuclear localization of DCAF1 and for Vpx-DCAF1 interaction; Merlin and Vpx bind separate regions of DCAF1 (Merlin is resistant to displacement by Vpx). The DCAF1(1-1311) truncation mutant acts as a dominant negative inhibiting Vpx-mediated SAMHD1 degradation.\",\n      \"method\": \"DCAF1 truncation/mutagenesis, co-immunoprecipitation, SAMHD1 degradation assay, nuclear localization imaging\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic truncation mutagenesis with Co-IP and functional degradation assay, single lab\",\n      \"pmids\": [\"31003777\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"VprBP/DCAF1 regulates RAG1 expression post-transcriptionally and independently of Dicer; loss of VprBP stabilizes RAG1 protein via a mechanism requiring both 20S proteasome and CRL4 ubiquitin ligase activity, and RAG1 stabilization by cullin-RING E3 inhibition promotes V(D)J recombination in pre-B cells.\",\n      \"method\": \"Conditional B-cell VprBP KO mouse, western blot (RAG1 stability), cullin-RING inhibitor (MLN4924), pre-B cell V(D)J recombination assay\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo conditional KO, pharmacological inhibition, functional V(D)J recombination readout, single lab\",\n      \"pmids\": [\"29925675\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DCAF1 interacts with PARD3 (Par3 polarity protein) and enhances PARD3 expression to activate the Akt signaling pathway, promoting hepatocellular carcinoma growth and metastasis.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, siRNA knockdown and overexpression, RNA sequencing, in vivo xenograft\",\n      \"journal\": \"Journal of experimental & clinical cancer research : CR\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP with functional phenotype, mechanism of PARD3 regulation not biochemically defined, single lab\",\n      \"pmids\": [\"38711082\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DCAF1 (VprBP) is a multifunctional substrate receptor that operates in two distinct E3 ubiquitin ligase contexts — the RING-type CRL4(DCAF1) complex (DDB1-CUL4A-ROC1) and the HECT-type EDD/UBR5 complex — where it recruits diverse substrates for monoubiquitylation or polyubiquitylation-dependent proteasomal degradation; additionally, DCAF1 harbors an intrinsic atypical protein kinase activity that phosphorylates histone H2A on T120 and non-histone proteins including EZH2 and p53 to drive epigenetic gene silencing, and it is constitutively hijacked by HIV-1 Vpr and HIV-2 Vpx, which redirect the CRL4(DCAF1) complex to degrade host restriction factors (SAMHD1, TET2, UNG2, HLTF, Exo1, SIRT7, and others) while also engaging the DCAF1 platform to recruit PLK4 for centrosome amplification.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DCAF1 (VprBP) is a multifunctional substrate receptor that bridges diverse substrates to cullin-RING ubiquitin ligase machinery, controlling cell cycle progression, genome maintenance, epigenetic silencing, and developmental homeostasis [#5, #20]. Its WD40 domain binds DDB1 stoichiometrically and through DDB1 to CUL4A, assembling the CRL4(DCAF1) E3 complex whose activity is enhanced by LisH-mediated dimerization [#5, #12]; DCAF1 also serves as a substrate receptor for the HECT-type EDD/UBR5 ligase, an unusual dual-service arrangement [#20]. Through CRL4(DCAF1) it directs polyubiquitylation and proteasomal degradation of an array of substrates including the NF2 tumor suppressor Merlin, the replication factor Mcm10, PP2A scaffold PP2A-A during oocyte meiosis, RAG1 during B-cell V(D)J recombination, p53 (via MDM2), the ribosome assembly factor PWP1, and PLK4 to restrain premature centriole duplication [#4, #16, #27, #13, #31, #42, #53]. Substrate selection can be encoded by post-translational degrons: a methyl degron generated by EZH2 and read by the DCAF1 chromo domain, or phospho-degrons created by DYRK2 on TERT and AKT on FAM13A [#14, #19, #51]. Independent of its ligase function, DCAF1 harbors an intrinsic atypical protein kinase activity that phosphorylates histone H2A at threonine 120 to silence tumor-suppressor and anti-osteoclastogenic genes, and phosphorylates non-histone substrates EZH2 (T367) and p53 (S367) to drive epigenetic gene silencing and p53 destabilization [#18, #48, #49, #58]. DCAF1 governs the Hippo pathway downstream of Merlin by ubiquitylating and inhibiting Lats1/2 to promote YAP/TEAD-dependent oncogenic transcription [#22, #24]. It is essential for proliferation and DNA replication, and its ablation in mice causes early embryonic lethality and selective loss of proliferating cells [#5, #42]. DCAF1 is constitutively hijacked by HIV-1 Vpr and HIV-2/SIV Vpx, which redirect CRL4(DCAF1) to degrade host restriction factors — including SAMHD1, UNG2, HLTF, Exo1, TET2, SIRT7, and TASOR — and to drive Vpr-induced G2 arrest and PLK4-dependent centrosome amplification [#1, #3, #9, #36, #44, #52]. The structural basis for this versatility has been defined by crystal structures of DDB1-DCAF1-Vpr-UNG2 and DCAF1-PROTAC ternary complexes, and DCAF1 has been validated as a covalent E3 handle (via Cys1113) for targeted protein degradation [#30, #57, #45].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established DCAF1/VprBP as a direct cellular binding partner of HIV-1 Vpr, defining the first molecular handle on its function.\",\n      \"evidence\": \"In vitro binding, co-IP, and Vpr nuclear-transport assays with VprBP mutational mapping\",\n      \"pmids\": [\"11223251\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No enzymatic activity assigned\", \"Cellular role beyond Vpr sequestration undefined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Resolved how Vpr exerts its cell-cycle effects by showing DCAF1 is the substrate receptor bridging Vpr to the CUL4-DDB1 E3 ligase, with Vpr binding required for G2 arrest and for boosting ligase activity.\",\n      \"evidence\": \"Co-IP, AP-MS, neddylation assays, siRNA, and Vpr point mutagenesis with G2-arrest readouts across multiple labs\",\n      \"pmids\": [\"17314515\", \"17609381\", \"18606781\", \"17620334\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous (non-Vpr) substrates not yet identified\", \"Direct substrate of the G2 arrest unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined DCAF1 architecture within CRL4 and its first endogenous substrate, establishing it as a stoichiometric WD40-domain adaptor with cell-cycle-regulated, chromatin-associated, replication-promoting roles essential for viability.\",\n      \"evidence\": \"Co-IP, chromatin fractionation, BrdU/cell-cycle assays, conditional mouse KO, and Merlin ubiquitination assays\",\n      \"pmids\": [\"18606781\", \"18332868\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How chromatin binding directs substrate choice unclear\", \"Degron logic for endogenous substrates undefined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Extended the Vpr paradigm to HIV-2/SIV Vpx, showing Vpx also co-opts DCAF1-CUL4 to enable reverse transcription and infection of macrophages.\",\n      \"evidence\": \"Proteomic pulldown, co-IP, RNAi, and infection assays measuring reverse transcripts in primary macrophages\",\n      \"pmids\": [\"18464893\", \"19264781\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The restriction factor degraded by Vpx not yet identified at this stage\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Linked DCAF1 to tumor suppression by showing nuclear Merlin binds and inhibits CRL4(DCAF1), and reconstituted the Vpr-UNG2 substrate-loading mechanism in vitro.\",\n      \"evidence\": \"Co-IP, nuclear fractionation, expression profiling, tumorigenicity assays, and in vitro reconstituted UNG2 ubiquitination\",\n      \"pmids\": [\"20178741\", \"20870715\", \"20824083\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream effectors of derepressed CRL4(DCAF1) not yet defined\", \"Mechanism of Merlin-mediated inhibition structurally unresolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Placed DCAF1 in cell-competition biology by identifying the Drosophila ortholog Mahjong as an Lgl partner acting through JNK-dependent apoptosis.\",\n      \"evidence\": \"Co-IP and Drosophila/MDCK genetics with JNK pathway manipulation\",\n      \"pmids\": [\"20644714\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ligase or kinase activity mediates competition unclear at this stage\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed CRL4(DCAF1) dimerizes via an N-terminal LisH helix that enhances E3 activity, and identified RAG1 as a CRL4(DCAF1) target required for proper V(D)J recombination.\",\n      \"evidence\": \"EM, in vitro reconstitution/mutagenesis, and conditional B-cell KO with V(D)J recombination sequencing\",\n      \"pmids\": [\"21226479\", \"22157821\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RAG1 is a direct ubiquitylation substrate vs. regulated indirectly unresolved\", \"Structural basis of dimer-enhanced catalysis not defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Revealed degron-based substrate recognition by DCAF1, including chromo-domain reading of EZH2-generated methyl degrons and recruitment of replication factor Mcm10 and constitutive UNG2/SMUG1 turnover.\",\n      \"evidence\": \"Modeling/binding assays with chromo-domain mutagenesis, in vitro methylation and ubiquitination, and degradation assays\",\n      \"pmids\": [\"23063525\", \"22570418\", \"22292079\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Chromo-domain methyl-reading shown for limited substrates\", \"Generality of methyl-degron logic untested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Discovered that DCAF1 is a moonlighting protein: an intrinsic atypical kinase phosphorylating nucleosomal H2A-T120 to silence tumor-suppressor genes, and a dual-service receptor also serving the HECT-type EDD/UBR5 ligase to degrade TERT and NuRD adaptors.\",\n      \"evidence\": \"In vitro nucleosomal kinase assays, ChIP, xenografts, EDD-dependent TERT and ZIP degradation, and review synthesis\",\n      \"pmids\": [\"24140421\", \"23362280\", \"23612978\", \"24028781\", \"24116224\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Catalytic mechanism of the atypical kinase undefined\", \"How kinase vs. ligase activities are coordinated unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined the Merlin-DCAF1 interface structurally and the oncogenic output of the pathway, and showed CRL4(DCAF1) monoubiquitylates TET enzymes to control DNA hydroxymethylation in development.\",\n      \"evidence\": \"Crystal structures of Merlin FERM-DCAF1, Lats1/2 ubiquitination/YAP-TEAD epistasis, and oocyte-specific KO with 5hmC imaging\",\n      \"pmids\": [\"24912773\", \"24706749\", \"25026211\", \"25557551\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Merlin inhibition is relieved in tumors not fully resolved\", \"Mono- vs. poly-ubiquitylation switching mechanism unclear\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Connected DCAF1 to meiosis and replication-coupled proteolysis through PP2A-A and ESCO2 degradation, and showed Vpr exploits MCM10 as a natural CRL4(DCAF1) substrate.\",\n      \"evidence\": \"Oocyte-specific KO with genetic rescue, in vitro ubiquitination, cell synchronization, and Vpr-dependent MCM10 degradation assays\",\n      \"pmids\": [\"26281983\", \"30100344\", \"26032416\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Degron features distinguishing replication substrates unclear\", \"Coordination with APC/C in ESCO2 turnover not fully defined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established DCAF1 as essential for proliferation in part by restraining p53, defined Vpr/Vpx-DCAF1 binding determinants structurally, and mapped the minimal DCAF1-WD module.\",\n      \"evidence\": \"Conditional T-cell KO with p53-deletion rescue, DDB1-DCAF1-Vpr-UNG2 crystal structure, DICER1 degradation, and DCAF1-WD mutagenesis\",\n      \"pmids\": [\"26728942\", \"27571178\", \"26965998\", \"24558487\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct p53 ubiquitylation by DCAF1 vs. MDM2-mediated effect distinction\", \"p53-independent growth function uncharacterized at this stage\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Expanded the Vpr substrate repertoire to HLTF, Exo1, TET2, and CP110, linking DCAF1 hijacking to chromatin remodeling, IL-6-driven viral replication, and centrosomal effects.\",\n      \"evidence\": \"In vitro reconstitution, mutagenesis, ChIP, conditional KO, and HIV-1 infection assays in T cells\",\n      \"pmids\": [\"29079575\", \"30352932\", \"29883611\", \"29724823\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants of substrate-loop plasticity not yet structurally defined\", \"Physiological roles of CP110 control outside infection unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Broadened DCAF1 biology into redox/aging, antioxidant, and growth-factor signaling through GSTP1/ROS control in Tregs, KEAP1-independent NRF2 degradation, and TGF-beta/Activin receptor turnover, and identified essential ribosome-biogenesis control via PWP1.\",\n      \"evidence\": \"Conditional KO models, ROS assays, co-IP/ubiquitination, zebrafish embryogenesis, and MS substrate ID with ribosome profiling\",\n      \"pmids\": [\"32730228\", \"32171724\", \"31291647\", \"33355139\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NRF2 and Rheb degradation use CRL4 or kinase activity not always resolved\", \"Tissue-specificity of substrate selection unexplained\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined DCAF1 regulation and druggability, showing AR/OGT and USP2 control its abundance to repress p53, and validating Cys1113 as a covalent handle for PROTAC-based targeted degradation.\",\n      \"evidence\": \"Knockdown, ChIP-seq, USP2 KO/inhibitor tumor models, and chemical proteomics with C1113A mutagenesis and PROTAC assays\",\n      \"pmids\": [\"35348747\", \"37024504\", \"36170674\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which DCAF1 represses p53 in prostate cancer (kinase vs. ligase) not fully resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Consolidated the atypical-kinase axis by showing DCAF1 phosphorylates EZH2-T367 to elevate H3K27me3 and p53-S367 to promote its degradation, defining a kinase-driven epigenetic silencing and tumor-suppressor-restraint program.\",\n      \"evidence\": \"In vitro kinase assays, phospho-specific antibodies, T367A/S367A mutagenesis, ChIP, organoid and xenograft models, and FAM13A phospho-degron mapping\",\n      \"pmids\": [\"37069142\", \"37041410\", \"36749583\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Substrate-selection rules of the atypical kinase undefined\", \"Structural basis of the kinase domain unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Resolved the dual, opposing relationship between DCAF1 and PLK4/centriole control and the structural plasticity enabling diverse substrate recruitment, while extending DCAF1 to glucose sensing, innate immunity, and HIV latency.\",\n      \"evidence\": \"AP-MS, reciprocal co-IP, PLK4 mutant/ubiquitination assays, DCAF1-PROTAC-WDR5 crystal structures, and metabolic, IFN, and LTR/NF-kB functional assays\",\n      \"pmids\": [\"38443376\", \"38490717\", \"39580491\", \"38862475\", \"40370558\", \"38905100\", \"39587626\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Vpr converts DCAF1-PLK4 from degradation to procentriole recruitment mechanistically unclear\", \"Integration of metabolic vs. immune substrate programs undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How DCAF1 partitions between its CRL4 ligase, EDD/UBR5 ligase, and intrinsic kinase activities — and what governs context-dependent substrate selection across its very broad target list — remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of the DCAF1 kinase domain or its substrate-recognition mode\", \"No unifying model for switching between ligase and kinase functions\", \"Determinants directing tissue- and signal-specific substrate choice unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [4, 9, 16, 23, 27, 53]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [18, 48, 49, 58]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [4, 5, 13, 20, 57]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [14, 18]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [8, 31]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [5, 8, 61]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [5, 10, 18]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [39, 52, 53]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-983168\", \"supporting_discovery_ids\": [4, 16, 27]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1, 5, 31, 53]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [14, 18, 23, 48]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [1, 6, 36, 52]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [8, 22, 59]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [9, 31, 42]}\n    ],\n    \"complexes\": [\n      \"CRL4(DCAF1) (DDB1-CUL4A-ROC1-DCAF1)\",\n      \"EDD/UBR5 E3 ligase complex\",\n      \"EDD-DYRK2-DDB1(DCAF1) complex\"\n    ],\n    \"partners\": [\n      \"DDB1\",\n      \"CUL4A\",\n      \"NF2\",\n      \"EZH2\",\n      \"TP53\",\n      \"PLK4\",\n      \"UNG2\",\n      \"DYRK2\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}