{"gene":"CUL4A","run_date":"2026-06-09T22:57:19","timeline":{"discoveries":[{"year":2006,"finding":"Crystal structure of the DDB1-CUL4A-ROC1 complex reveals that DDB1 uses one beta-propeller domain to bind the CUL4A cullin scaffold and a separate double-beta-propeller fold for substrate presentation. A family of WD40-repeat proteins (DCAFs) directly binds the double-propeller fold of DDB1 and serves as the substrate-recruiting module of the E3 ligase.","method":"X-ray crystallography combined with tandem-affinity purification and mass spectrometry","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with functional validation plus orthogonal proteomic identification of substrate receptors in same study","pmids":["16964240"],"is_preprint":false},{"year":2004,"finding":"Human DET1 assembles a multisubunit CUL4A ubiquitin ligase (DET1-DDB1-CUL4A-ROC1-COP1) that ubiquitinates and degrades the proto-oncogenic transcription factor c-Jun; RNAi knockdown of any subunit stabilizes c-Jun and increases c-Jun-dependent transcription.","method":"Co-immunoprecipitation, in vivo ubiquitination assay, RNAi knockdown with reporter assay","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, functional ubiquitination assay, and RNAi phenotype in one rigorous study; replicated across subunits","pmids":["14739464"],"is_preprint":false},{"year":2004,"finding":"DDB1 associates stoichiometrically with CUL4A in a manner analogous to SKP1 binding to CUL1; DDB1 directly binds CDT1 in vitro and bridges CDT1 to CUL4A in vivo, targeting CDT1 for CUL4A-dependent ubiquitination and UV-induced rapid degradation. CAND1 negatively regulates the DDB1-CUL4A association.","method":"Co-immunoprecipitation, in vitro binding assay with recombinant proteins, in vitro ubiquitination assay, siRNA knockdown","journal":"Nature Cell Biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with recombinant proteins plus in vivo Co-IP and siRNA functional validation","pmids":["15448697"],"is_preprint":false},{"year":2006,"finding":"The CUL4A-DDB1 complex (with PCNA and L2DTL/CDT2) interacts physically with p53 and MDM2/HDM2, and isolated CUL4A complexes display potent polyubiquitination activity toward p53 in an L2DTL-, PCNA-, DDB1-, ROC1-, and MDM2-dependent manner. MDM2 is rapidly proteolyzed after UV irradiation in a CUL4/DDB1- and PCNA-dependent manner.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, siRNA knockdown","journal":"Cell Cycle","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro ubiquitination reconstitution with multiple mutant/knockdown conditions, single lab","pmids":["16861890"],"is_preprint":false},{"year":2004,"finding":"CUL4A physically associates with MDM2 and p53; CUL4A overexpression accelerates p53 decay and delays p53 accumulation after DNA damage, but fails to increase p53 decay in MDM2-null MEFs, placing CUL4A within the MDM2-dependent p53 proteolysis pathway.","method":"Co-immunoprecipitation, cycloheximide chase assay, MDM2-null MEF genetic epistasis","journal":"Cancer Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with MDM2-null cells plus Co-IP, single lab","pmids":["15548678"],"is_preprint":false},{"year":2009,"finding":"CUL4A ubiquitin ligase restricts DNA repair capacity by mediating selective degradation of the NER DNA-damage sensors DDB2 and XPC, and the checkpoint effector p21/CIP1/WAF1; Cul4a skin-specific knockout mice show dramatically increased resistance to UV-induced skin carcinogenesis.","method":"Conditional knockout mice (Cre-lox), UV carcinogenesis assay, western blot for substrate levels","journal":"Molecular Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo conditional KO with defined molecular phenotype (substrate accumulation) and replicated in cell-based assays; multiple orthogonal methods","pmids":["19481525"],"is_preprint":false},{"year":2009,"finding":"REDD1, an mTORC1 inhibitor, is ubiquitinated and degraded by the CUL4A-DDB1-ROC1-β-TRCP E3 ligase complex in a GSK3β-dependent manner; this degradation is required for restoration of mTOR signaling as cells recover from hypoxic stress.","method":"Co-immunoprecipitation, in vivo ubiquitination assay, siRNA knockdown, GSK3β pharmacological inhibition","journal":"EMBO Reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ubiquitination assay with siRNA functional validation, single lab","pmids":["19557001"],"is_preprint":false},{"year":2009,"finding":"HIV-2/SIVsm Vpx assembles with the CUL4A-DDB1 ubiquitin ligase through recruitment of the DCAF1 adaptor protein; precluding Vpx from recruiting DCAF1 in macrophages blocks HIV-2 reverse transcript accumulation, indicating Vpx diverts CUL4A-DDB1(DCAF1) to inactivate a restriction factor.","method":"Co-immunoprecipitation, siRNA knockdown of DCAF1, viral infection assay with quantification of reverse transcripts","journal":"Journal of Virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus siRNA functional validation with virological readout, single lab","pmids":["19264781"],"is_preprint":false},{"year":2007,"finding":"HIV-1 Vpr induces G2 cell cycle arrest by assembling with DDB1 via DCAF1; siRNA-mediated reduction of DDB1 or CUL4A, but not DDB2, impairs Vpr-induced G2 arrest, and the arrest is blocked by a proteasome inhibitor, placing CUL4A-DDB1-DCAF1 as the E3 ligase mediating proteasome-dependent G2 arrest.","method":"Co-immunoprecipitation, siRNA knockdown, cell cycle analysis by FACS, proteasome inhibitor treatment","journal":"Journal of Virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA epistasis with cell cycle readout plus Co-IP, single lab","pmids":["17626091"],"is_preprint":false},{"year":2008,"finding":"VprBP/DCAF1 recruits the NF2 tumor suppressor Merlin to the ROC1-CUL4A-DDB1 E3 ligase complex via a direct interaction; serum stimulation promotes Merlin polyubiquitination and proteasome-mediated degradation through this complex, and VprBP depletion stabilizes Merlin and inhibits ERK and Rac1 activation.","method":"Co-immunoprecipitation, in vivo ubiquitination assay, siRNA knockdown, ERK/Rac1 activation assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with ubiquitination assay and functional pathway readout, single lab","pmids":["18332868"],"is_preprint":false},{"year":2008,"finding":"Assembly of HIV-1 Vpr with the functional CUL4A-DDB1(DCAF1) complex stabilizes Vpr against proteasomal degradation; DCAF1 overexpression stabilizes wild-type Vpr and causes cytoplasmic accumulation, whereas DCAF1 or DDB1 siRNA decreases Vpr steady-state levels. Vpr(Q65R) defective for DCAF1 binding undergoes faster proteasomal degradation.","method":"Co-immunoprecipitation, siRNA knockdown, cycloheximide chase, immunofluorescence localization","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus siRNA and mutant analysis, single lab","pmids":["18524771"],"is_preprint":false},{"year":2006,"finding":"CUL4A and DDB1 associate with SKP2 to promote degradation of the CDK inhibitor p27Kip1 via the COP9 signalosome; siRNA knockdown of DDB1, CUL4A, or CSN1 causes p27Kip1 accumulation, and DDB1-induced p27Kip1 proteolysis requires both CUL4A and functional signalosome.","method":"siRNA knockdown, co-immunoprecipitation, cycloheximide chase assay","journal":"Molecular and Cellular Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus siRNA epistasis with defined substrate phenotype, single lab","pmids":["16537899"],"is_preprint":false},{"year":2006,"finding":"CUL4A ubiquitin ligase directly targets p27Kip1 for degradation during erythropoiesis; CUL4A and p27 coimmunoprecipitate, CUL4A overexpression destabilizes p27 and promotes proliferation at the expense of terminal differentiation, while CUL4A declines during normal terminal erythroid differentiation allowing p27 accumulation.","method":"Co-immunoprecipitation, overexpression in hematopoietic cell line, cycloheximide chase, differentiation assay","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with functional overexpression/differentiation phenotype, single lab","pmids":["16467204"],"is_preprint":false},{"year":2003,"finding":"CUL4A ubiquitin machinery promotes ubiquitylation and proteasome-dependent degradation of the HOXA9 homeodomain protein; the homeodomain of HOXA9 is responsible for CUL4A-mediated degradation, and CUL4A interference (overexpression or RNAi) alters HOXA9 steady-state levels and impairs granulocytic differentiation of myeloid progenitors.","method":"In vivo ubiquitination assay, overexpression and RNAi, cycloheximide chase, myeloid differentiation assay","journal":"EMBO Journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitination assay with domain mapping and differentiation phenotype, single lab","pmids":["14609952"],"is_preprint":false},{"year":2013,"finding":"CUL4A modulates histone H3K4me3 at the ZEB1 promoter to drive ZEB1 transcription and thereby promotes epithelial-mesenchymal transition, metastasis, and tumorigenesis in breast cancer; ZEB1 silencing blocks CUL4A-driven EMT and metastasis.","method":"Chromatin immunoprecipitation (ChIP), siRNA/shRNA knockdown, overexpression, mouse xenograft and syngeneic tumor models","journal":"Cancer Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP for histone mark at ZEB1 promoter with in vivo rescue experiments, single lab","pmids":["24305877"],"is_preprint":false},{"year":2011,"finding":"CUL4A is essential for spermatogenesis; Cul4A-/- mice are male infertile with defects in meiotic recombination (persistent double-strand breaks in pachytene spermatocytes) and CUL4A localizes to DSBs generated in pre-pachytene spermatocytes, identifying a role in meiotic DSB repair.","method":"Cul4A knockout mouse, histology, immunofluorescence localization of CUL4A to DSBs, γH2AX staining","journal":"Developmental Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockout mouse with defined cytological phenotype and localization experiment, single lab","pmids":["21291880"],"is_preprint":false},{"year":2009,"finding":"Cells lacking CUL4A show proliferation defects, G1/S delay and early M-phase arrest; accumulation of p53 and p27Kip1 substrates is observed, and dominant-negative p53 reverses proliferation defects. Cul4A-deleted cells also show centrosome amplification, multipolar spindles, micronuclei, and reduced UV-induced unscheduled DNA synthesis.","method":"Conditional Cul4A knockout MEFs (Cre-lox), cell cycle analysis, dominant-negative p53 rescue, centrosome immunofluorescence, UDS assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with multiple orthogonal phenotype readouts and partial genetic rescue, single lab","pmids":["19430492"],"is_preprint":false},{"year":2013,"finding":"The CUL4A-DDB1 E3 ligase complex monoubiquitylates p73 through a direct interaction between p73 and the DDB1 subunit; this modification does not affect p73 stability but negatively regulates p73-dependent transcriptional activity.","method":"Co-immunoprecipitation, in vivo ubiquitination assay (mono-ubiquitylation), DDB1 knockdown, p73 target gene expression analysis","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with ubiquitination assay distinguishing mono- vs polyubiquitylation and transcriptional phenotype, single lab","pmids":["23085759"],"is_preprint":false},{"year":2013,"finding":"H1.2 linker histone stably interacts with CUL4A E3 ubiquitin ligase and PAF1 elongation complexes; this interaction potentiates target gene transcription via induction of H4K31 ubiquitylation, H3K4me3, and H3K79me2. H1.2 bridges CUL4A and PAF1 complexes by interacting with serine-2-phosphorylated RNAPII.","method":"Co-immunoprecipitation, ChIP, siRNA knockdown, histone modification analysis","journal":"Cell Reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus ChIP with multiple histone marks, single lab","pmids":["24360965"],"is_preprint":false},{"year":2011,"finding":"Artemis directly interacts with DDB2 (a substrate receptor of CUL4A-DDB1) and with p27; both DDB2 and Artemis are required for CUL4A-DDB1-mediated degradation of p27, regulating G1-phase cell cycle progression in normally proliferating cells and after serum deprivation.","method":"Co-immunoprecipitation, siRNA knockdown, cell cycle analysis, p27 stability assay","journal":"Cell Cycle","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with siRNA epistasis and cell cycle readout, single lab","pmids":["22134138"],"is_preprint":false},{"year":2013,"finding":"The inhibition of CUL4A neddylation by MLN4924 blocks Vpx-induced SAMHD1 degradation and maintains SAMHD1-mediated restriction of HIV-1 in myeloid cells; removal of the drug restores Vpx activity, supporting deoxynucleoside triphosphate pool depletion (not nucleolytic activity) as the primary SAMHD1 restriction mechanism.","method":"MLN4924 neddylation inhibitor treatment, western blot for SAMHD1 levels, viral infection assay","journal":"Journal of Virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological CUL4A inactivation with defined molecular and virological phenotype, reversibility demonstrated","pmids":["23986575"],"is_preprint":false},{"year":2014,"finding":"CUL4A-DDB1-Rbx1 E3 ligase complex (CRL4A) controls the quality of the PTS2 receptor Pex7p by targeting dysfunctional Pex7p (including RCDP patient mutants) for ubiquitin-dependent proteasomal degradation; this quality control is essential for maintaining normal PTS2-import into peroxisomes.","method":"Ubiquitination assay, proteasome inhibitor treatment, co-immunoprecipitation, PTS2-import functional assay","journal":"Biochemical Journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitination assay with Co-IP and functional PTS2-import readout, single lab","pmids":["24989250"],"is_preprint":false},{"year":2021,"finding":"CUL4A-based E3 ligase complex monoubiquitinates PHGDH at lysine 146, enhancing PHGDH activity by recruiting chaperone DNAJA1 to promote its tetrameric formation, thereby increasing serine, glycine, and S-adenosylmethionine (SAM) levels; elevated SAM upregulates adhesion gene expression via SETD1A-mediated H3K4 trimethylation to promote colorectal cancer metastasis.","method":"In vivo ubiquitination assay with K146 mutagenesis, Co-immunoprecipitation, PHGDH enzymatic activity assay, ChIP, metabolite measurement","journal":"Journal of Clinical Investigation","confidence":"High","confidence_rationale":"Tier 1 / Strong — site-specific monoubiquitination with mutagenesis, enzyme activity reconstitution, ChIP, and metabolomics in one rigorous study","pmids":["34720086"],"is_preprint":false},{"year":2022,"finding":"A CUL4A-DDB1-WDFY1 E3 ubiquitin ligase complex initiates lysophagy by ubiquitinating LAMP2 on damaged lysosomes, recruiting autophagic machinery for clearance of damaged lysosomes.","method":"Proteomic screen with transfection reagent-coated beads, Co-immunoprecipitation, in vivo ubiquitination assay, knockdown with lysophagy functional assay","journal":"Cell Reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with ubiquitination assay and autophagy functional readout, single lab","pmids":["36103833"],"is_preprint":false},{"year":2016,"finding":"CUL4A promotes gastric cancer proliferation and EMT by downregulating LATS1-Hippo-YAP signaling; knockdown of CUL4A increases LATS1 levels and MST1 activity, while overexpression decreases them, and the effects are reversed by co-manipulation of YAP.","method":"siRNA/shRNA knockdown, overexpression, western blot, mouse xenograft model","journal":"Oncotarget","confidence":"Low","confidence_rationale":"Tier 3 / Weak — knockdown/overexpression with pathway protein levels, no direct ubiquitination of LATS1 demonstrated in this paper, single lab","pmids":["26840256"],"is_preprint":false},{"year":2017,"finding":"NRIP/DCAF6 displaces DDB2 from the androgen receptor (AR)-DDB2-DDB1-CUL4A complex to stabilize AR protein; NRIP and DDB2 compete for the same AR binding domain but both bind DDB1, so NRIP protects AR from CUL4A-mediated destabilization.","method":"Co-immunoprecipitation, competition binding assay, AR protein stability assay, immunohistochemistry","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP with competition binding and protein stability functional assay, single lab","pmids":["28212551"],"is_preprint":false},{"year":2016,"finding":"pSTAT3 binds to the CUL4A promoter and acts as a transcription factor to upregulate CUL4A expression in response to IL-6 stimulation; CUL4A knockdown abrogates IL-6-driven ZEB1 induction and cell invasion in colorectal cancer cells.","method":"ChIP assay, luciferase reporter assay for CUL4A promoter, siRNA knockdown, matrigel invasion assay","journal":"Archives of Medical Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus luciferase reporter for transcriptional regulation, with functional invasion assay, single lab","pmids":["27418574"],"is_preprint":false},{"year":2019,"finding":"CREB directly occupies cAMP response elements at the CUL4A promoter and positively regulates CUL4A transcription; ERK pathway inhibition reduces pCREB and CUL4A levels, and CUL4A in turn activates ERK/CREB through a positive feedback loop.","method":"ChIP assay, CREB overexpression/knockdown, ERK inhibitor (U0126) treatment, qPCR/western blot","journal":"Medical Oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrating CREB occupancy at CUL4A promoter with pharmacological and siRNA epistasis, single lab","pmids":["30666499"],"is_preprint":false},{"year":2019,"finding":"CUL4A interacts with PARP1 and reduces PARP1 expression under oxidative stress; this interaction is enhanced by H2O2 treatment, and CUL4A overexpression suppresses ROS generation and apoptosis in H9c2 cardiomyocytes.","method":"Co-immunoprecipitation, western blot, ROS measurement, flow cytometry apoptosis assay, adenoviral overexpression","journal":"Oxidative Medicine and Cellular Longevity","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP with overexpression phenotype, no direct ubiquitination assay, single lab","pmids":["31178959"],"is_preprint":false},{"year":2020,"finding":"The CARM1-p300-c-Myc-Max (CPCM) transcriptional complex activates CUL4A/4B expression by binding their promoters; knockdown of any CPCM component decreases CUL4A/4B levels, impairs CRL4 E3 ligase activity, and causes accumulation of the CRL4 substrate ST7.","method":"Mass spectrometry, Co-immunoprecipitation, ChIP, siRNA knockdown, CRL4 E3 ligase activity assay","journal":"International Journal of Biological Sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP with promoter occupancy, MS identification of complex, and functional E3 ligase activity assay, single lab","pmids":["32140072"],"is_preprint":false},{"year":2023,"finding":"AKT phosphorylates FAM13A at serine 312, enabling recognition by the CUL4A/DDB1/DCAF1 E3 ligase complex, which ubiquitinates FAM13A and targets it for proteasomal degradation; reduced FAM13A accelerates lung epithelial cell proliferation during injury recovery.","method":"In vivo ubiquitination assay, site-directed mutagenesis (S312), Co-immunoprecipitation, AKT kinase assay, mouse lung injury model","journal":"American Journal of Respiratory Cell and Molecular Biology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — phosphorylation-dependent ubiquitination with mutagenesis and in vivo validation, single lab","pmids":["36749583"],"is_preprint":false},{"year":2026,"finding":"CUL4A-DDB1-DCAF10 constitutes an N-recognin E3 ligase complex that recognizes N-terminally acetylated Src-family kinases (SFKs); DCAF10 is the substrate receptor that specifically recognizes N-terminal acetylated glycine on SFKs that fail to be myristoylated. In vitro, the CUL4A-DDB1-DCAF10 complex ubiquitinates N-terminally acetylated SFKs, defining a novel Ac/N-degron pathway that monitors replacement of myristoylation by acetylation.","method":"Peptide pull-downs, mass spectrometry, AlphaFold3 structural predictions, siRNA knockdown, CRISPR/Cas9 knockout, inducible overexpression of Lyn-GFP variants, in vitro ubiquitination assay","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of ubiquitination, structural prediction with mutagenesis, and CRISPR/siRNA orthogonal validation in one study","pmids":["41484149"],"is_preprint":false},{"year":2023,"finding":"CUL4A-DDB1 can be recruited via a covalent recruiter targeting C173 on DDB1 for PROTAC-mediated targeted degradation of neo-substrates BRD4 (short isoform selectively) and androgen receptor; degradation is proteasome-, neddylation-, and DDB1-dependent.","method":"Activity-based protein profiling, cysteine chemoproteomic screening, PROTAC degradation assay, proteasome/neddylation inhibitor treatment","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — chemical biology approach with mechanistic controls (inhibitor rescue, DDB1 dependence), preprint","pmids":["37614621"],"is_preprint":true},{"year":2022,"finding":"CUL4A promotes SAMHD1-independent resistance to cytarabine in AML cells by facilitating PCNA mono-ubiquitination, which promotes the polymerase switch toward error-prone translesion DNA polymerases; siRNA against CUL4A re-sensitizes AML cells to cytarabine similarly to siRNA against REV3L.","method":"siRNA screen (437 siRNAs), siRNA knockdown epistasis, western blot for PCNA ubiquitination, cell viability assay","journal":"HemaSphere","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA epistasis with REV3L plus PCNA ubiquitination evidence, single lab","pmids":["35519003"],"is_preprint":false},{"year":2022,"finding":"Targeted inhibition of CUL4A results in significant downregulation of DDB2 (a DNA-damage recognition protein for NER), enhancing cisplatin-induced DNA damage and apoptosis; CUL4A knockdown or pevonedistat treatment phenocopies DDB2 silencing in sensitizing HNSCC cells to cisplatin, with in vivo tumor regression and long-term survival in mouse models.","method":"siRNA knockdown of CUL4A/DDB2, pevonedistat treatment, western blot for DDB2, γH2AX measurement, xenograft mouse model","journal":"Cell Death & Disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA epistasis with pharmacological validation and in vivo xenograft model, single lab","pmids":["35428778"],"is_preprint":false},{"year":2019,"finding":"CUL4A directly interacts with and ubiquitinates ANXA10 (annexin A10) to promote its degradation in lung cancer cells; knockdown of CUL4A upregulates ANXA10, and ANXA10 knockdown reverses the inhibition of invasion/metastasis caused by CUL4A knockdown.","method":"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, overexpression, mouse tail-vein metastasis model","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with ubiquitination assay and genetic rescue experiment in vivo, single lab","pmids":["31052599"],"is_preprint":false},{"year":2014,"finding":"In zebrafish, cul4a (but not cul4b) transcriptionally upregulates tbx5a; morpholino knockdown of cul4a reduces tbx5a expression and causes failure of heart looping and pectoral fin development with reduced cardiac cell proliferation.","method":"Morpholino knockdown in zebrafish, qPCR for tbx5a, rescue experiments, histology","journal":"Human Molecular Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — morpholino knockdown with defined molecular target and developmental phenotype, single lab","pmids":["25274780"],"is_preprint":false},{"year":2023,"finding":"CUL4A mediates LATS1 ubiquitination and degradation to promote glioma progression via Hippo pathway inhibition; S100A16 promotes this by interacting with CUL4A and LATS1, and CUL4A knockdown rescues LATS1 levels and inhibits YAP nuclear import.","method":"Co-immunoprecipitation, ubiquitination assay, western blot, siRNA knockdown, xenograft mouse model","journal":"International Journal of Biological Sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — Co-IP and ubiquitination assay without detailed biochemical reconstitution, single lab, mechanistic detail limited","pmids":["37151881"],"is_preprint":false}],"current_model":"CUL4A is the cullin scaffold subunit of the DDB1-CUL4A-ROC1/RBX1 Cullin-RING E3 ubiquitin ligase (CRL4A), in which DDB1 acts as a bridging adaptor using its double-beta-propeller fold to recruit interchangeable WD40-repeat substrate receptors (DCAFs) that determine substrate specificity; the complex ubiquitinates a broad range of substrates including CDT1, p21, p27, DDB2, XPC, HOXA9, c-Jun, REDD1, Merlin, PHGDH, LATS1, LAMP2, Pex7p, FAM13A, and N-terminally acetylated Src-family kinases, thereby controlling DNA repair capacity, DNA replication licensing, cell cycle progression, meiotic recombination, hematopoiesis, EMT, autophagy initiation, peroxisome quality control, and viral immune evasion, with its own transcription regulated by CREB/ERK feedback and c-Myc-containing complexes."},"narrative":{"mechanistic_narrative":"CUL4A is the cullin scaffold of a multisubunit Cullin-RING E3 ubiquitin ligase (CRL4A) in which DDB1 bridges the CUL4A-ROC1 catalytic core to interchangeable WD40-repeat substrate receptors (DCAFs) that dictate substrate choice; the DDB1 double-beta-propeller fold both binds CUL4A and presents these receptors, and the DDB1-CUL4A association is gated by CAND1 [PMID:16964240, PMID:15448697]. Through this architecture CRL4A is a master regulator of genome maintenance and cell-cycle progression, restraining DNA repair capacity by degrading the nucleotide-excision-repair sensors DDB2 and XPC and the checkpoint effector p21, such that loss of CUL4A confers resistance to UV carcinogenesis [PMID:19481525], and licensing replication by targeting CDT1 for UV-induced degradation [PMID:15448697]. The ligase couples to the p53 axis—accelerating p53 turnover within the MDM2 pathway and polyubiquitinating p53 with PCNA and CDT2/L2DTL—and degrades the CDK inhibitors p27Kip1 (in concert with SKP2, the COP9 signalosome, and DDB2/Artemis) and the homeodomain factor HOXA9, thereby coupling proliferation to differentiation in hematopoietic lineages [PMID:16861890, PMID:15548678, PMID:16537899, PMID:22134138, PMID:14609952]. CUL4A controls a broad substrate range across stress and signaling—degrading the mTORC1 inhibitor REDD1, the NF2 tumor suppressor Merlin, and N-terminally acetylated Src-family kinases recognized by the DCAF10 receptor as an Ac/N-degron pathway—and drives metabolism and quality control through monoubiquitination events that activate PHGDH and target damaged-lysosome LAMP2 for lysophagy via WDFY1 [PMID:19557001, PMID:18332868, PMID:41484149, PMID:34720086, PMID:36103833]. CUL4A promotes epithelial-mesenchymal transition, invasion, and metastasis in multiple carcinomas via chromatin and Hippo effects, including H3K4me3-driven ZEB1 transcription and downregulation of LATS1 [PMID:24305877, PMID:26840256], and is itself a transcriptional hub whose expression is driven by CREB/ERK feedback, IL-6/pSTAT3, and a CARM1-p300-c-Myc-Max complex [PMID:30666499, PMID:27418574, PMID:32140072]. Its DDB1-DCAF1 arm is hijacked by HIV Vpr/Vpx to trigger G2 arrest and degrade restriction factors, and the DDB1 surface (C173) is exploitable for PROTAC-mediated targeted protein degradation [PMID:17626091, PMID:23986575].","teleology":[{"year":2003,"claim":"Established that CUL4A is an active ubiquitin ligase scaffold with biological output by showing it controls turnover of a developmental transcription factor, linking it to hematopoietic differentiation before its detailed architecture was known.","evidence":"in vivo ubiquitination, domain mapping, and myeloid differentiation assays on HOXA9","pmids":["14609952"],"confidence":"Medium","gaps":["Direct substrate receptor (DCAF) for HOXA9 not identified","No reconstituted ubiquitination with defined components"]},{"year":2004,"claim":"Defined how CUL4A achieves substrate specificity by showing DDB1 acts as a SKP1-like adaptor that directly binds and bridges substrates such as CDT1 to the cullin, and identified COP1/DET1 assembly degrading c-Jun, establishing the substrate-adaptor logic of the complex.","evidence":"in vitro binding with recombinant proteins, Co-IP, in vitro ubiquitination, and RNAi reporter assays for CDT1 and c-Jun","pmids":["15448697","14739464"],"confidence":"High","gaps":["Generality of DDB1 as adaptor across substrates not yet shown","Role of CAND1 regulation mechanistically incomplete"]},{"year":2006,"claim":"Resolved the molecular architecture of the ligase, showing DDB1 uses one beta-propeller to grip CUL4A and a double-propeller to recruit an interchangeable family of WD40 DCAF substrate receptors, providing the structural framework for substrate diversity.","evidence":"X-ray crystallography of DDB1-CUL4A-ROC1 plus tandem-affinity purification/MS identification of DCAFs","pmids":["16964240"],"confidence":"High","gaps":["Structures of substrate-bound DCAF complexes not determined","How CAND1 and neddylation cycle exchange receptors not resolved structurally"]},{"year":2006,"claim":"Connected CRL4A to cell-cycle control and tumor suppression by demonstrating degradation of the CDK inhibitor p27Kip1 (with SKP2 and the COP9 signalosome) and polyubiquitination of p53 within the MDM2/PCNA pathway.","evidence":"Co-IP, in vitro ubiquitination, siRNA epistasis, and cycloheximide chase for p27 and p53","pmids":["16537899","16467204","16861890"],"confidence":"Medium","gaps":["Precise DCAF receptor for p27 not defined in these studies","Relative contribution of CRL4A vs SCF to p27 turnover unclear"]},{"year":2009,"claim":"Established the in vivo physiological role of CUL4A in genome maintenance by showing that conditional knockout stabilizes DDB2, XPC and p21 and confers UV-carcinogenesis resistance, and that loss causes G1/S delay, centrosome amplification and p53/p27 accumulation.","evidence":"conditional Cre-lox knockout mice and MEFs, UV carcinogenesis assay, dominant-negative p53 rescue, substrate western blots","pmids":["19481525","19430492"],"confidence":"High","gaps":["Tissue-specific substrate hierarchies not dissected","Mechanism of centrosome amplification not defined molecularly"]},{"year":2009,"claim":"Extended the substrate repertoire into stress and growth signaling by identifying REDD1 (mTORC1 recovery) and Merlin/NF2 (ERK/Rac1 control) as CRL4A targets via dedicated cofactors.","evidence":"Co-IP, in vivo ubiquitination, siRNA, GSK3beta inhibition (REDD1) and VprBP/DCAF1-dependent ubiquitination with pathway readouts (Merlin)","pmids":["19557001","18332868"],"confidence":"Medium","gaps":["Direct reconstitution of REDD1 and Merlin ubiquitination not shown","How phospho-degron recognition is coupled to DCAFs unclear"]},{"year":2009,"claim":"Revealed viral hijacking of the complex, showing HIV Vpr/Vpx recruit DDB1-DCAF1 to drive G2 arrest and degrade restriction factors, and that Vpr is itself stabilized by the complex.","evidence":"Co-IP, DCAF1/DDB1 siRNA, cell-cycle FACS, proteasome inhibition, and viral reverse-transcript quantification","pmids":["17626091","19264781","18524771"],"confidence":"Medium","gaps":["Identity of the cellular target driving G2 arrest not fully defined here","Single-lab Co-IP evidence for some interactions"]},{"year":2011,"claim":"Demonstrated a direct role for CUL4A in meiotic and somatic DNA-damage responses, with localization to double-strand breaks and male infertility on knockout, plus a DDB2/Artemis route to p27 degradation.","evidence":"Cul4A knockout mice, immunofluorescence of CUL4A at DSBs, gammaH2AX staining, and Co-IP/siRNA p27 stability assays","pmids":["21291880","22134138"],"confidence":"Medium","gaps":["Direct repair substrate at DSBs not identified","Whether CUL4A acts catalytically or structurally at DSBs unresolved"]},{"year":2013,"claim":"Linked CUL4A to chromatin-based transcriptional control and metastasis by showing it modulates H3K4me3 to activate ZEB1-driven EMT, monoubiquitinates p73 to restrain its activity, and works with H1.2/PAF1 to deposit activating histone marks.","evidence":"ChIP, in vivo mono- vs polyubiquitination assays, knockdown/overexpression, and xenograft/syngeneic tumor models","pmids":["24305877","23085759","24360965"],"confidence":"Medium","gaps":["Direct histone ubiquitination targets of CRL4A at these loci not fully defined","Coupling of ligase activity to specific histone-modifying enzymes incomplete"]},{"year":2016,"claim":"Identified upstream transcriptional control of CUL4A itself, placing it within IL-6/pSTAT3, CREB/ERK feedback, and CARM1-p300-c-Myc-Max regulatory circuits that tune CRL4 ligase output.","evidence":"ChIP and luciferase promoter assays, ERK inhibitor (U0126) and siRNA epistasis, MS identification of the CPCM complex, and CRL4 activity/substrate (ST7) assays","pmids":["27418574","30666499","32140072"],"confidence":"Medium","gaps":["Quantitative contribution of each transcriptional input in different tissues unknown","Feedback dynamics to ERK/CREB not modeled"]},{"year":2022,"claim":"Expanded CRL4A function into metabolism, organelle quality control, and chemoresistance through non-degradative monoubiquitination (PHGDH activation, LAMP2-driven lysophagy) and PCNA monoubiquitination promoting translesion synthesis.","evidence":"site-specific ubiquitination with mutagenesis, enzyme activity and metabolomics (PHGDH), proteomic screen and lysophagy assay (LAMP2/WDFY1), and siRNA epistasis with REV3L (PCNA/cytarabine)","pmids":["34720086","36103833","35519003"],"confidence":"Medium","gaps":["DCAF receptors for PHGDH and PCNA not defined","How CRL4A switches between mono- and poly-ubiquitination outcomes unclear"]},{"year":2023,"claim":"Demonstrated phospho-degron and chemical-handle utility, with AKT-phosphorylated FAM13A recognized by DDB1-DCAF1 for degradation, and the DDB1 C173 surface exploited for PROTAC-mediated degradation of neo-substrates.","evidence":"phospho-dependent in vivo ubiquitination with S312 mutagenesis and lung injury model (FAM13A); cysteine chemoproteomics and PROTAC degradation with inhibitor controls (BRD4/AR, preprint)","pmids":["36749583","37614621"],"confidence":"Medium","gaps":["Generality of DDB1-recruiter PROTAC approach across cell types not established (preprint)","Phospho-degron consensus for DCAF1 recognition not defined"]},{"year":2026,"claim":"Defined a new degradation logic, an Ac/N-degron pathway in which DCAF10 directs CRL4A to N-terminally acetylated Src-family kinases that fail myristoylation, coupling lipid-modification surveillance to ubiquitin-mediated turnover.","evidence":"peptide pull-downs, MS, AlphaFold3 modeling with mutagenesis, CRISPR/siRNA, and in vitro reconstituted ubiquitination of acetylated SFKs","pmids":["41484149"],"confidence":"High","gaps":["In vivo physiological consequences of SFK Ac/N-degron turnover not established","Breadth of N-acetylated substrate set beyond SFKs unknown"]},{"year":null,"claim":"How the cell selects among CRL4A's many DCAF receptors and decides between mono- vs poly-ubiquitination, degradative vs activating outcomes, across tissues and stresses remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model of DCAF exchange dynamics in vivo","Determinants of mono- vs poly-ubiquitin chain output undefined","Tissue-specific substrate prioritization unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[0,2,5,22,31]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[1,2,5,22,31,35]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[14,15,18]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[10]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,2,5]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[11,16,19]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[5,15,33]},{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[2]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[23]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[14,18]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[7,8,20]}],"complexes":["CRL4A (DDB1-CUL4A-ROC1/RBX1)","CUL4A-DDB1-DCAF1 (VprBP)","DET1-DDB1-CUL4A-ROC1-COP1","CUL4A-DDB1-DCAF10"],"partners":["DDB1","RBX1","DCAF1","DDB2","DCAF10","SKP2","PCNA","CAND1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q13619","full_name":"Cullin-4A","aliases":[],"length_aa":759,"mass_kda":87.7,"function":"Core component of multiple cullin-RING-based E3 ubiquitin-protein ligase complexes which mediate the ubiquitination of target proteins (PubMed:14578910, PubMed:14739464, PubMed:15448697, PubMed:15548678, PubMed:15811626, PubMed:16678110, PubMed:17041588, PubMed:24209620, PubMed:30166453, PubMed:33854232, PubMed:33854239). As a scaffold protein may contribute to catalysis through positioning of the substrate and the ubiquitin-conjugating enzyme (PubMed:14578910, PubMed:14739464, PubMed:15448697, PubMed:15548678, PubMed:15811626, PubMed:16678110, PubMed:17041588, PubMed:24209620). The E3 ubiquitin-protein ligase activity of the complex is dependent on the neddylation of the cullin subunit and is inhibited by the association of the deneddylated cullin subunit with TIP120A/CAND1 (PubMed:14578910, PubMed:14739464, PubMed:15448697, PubMed:15548678, PubMed:15811626, PubMed:16678110, PubMed:17041588, PubMed:24209620). The functional specificity of the E3 ubiquitin-protein ligase complex depends on the variable substrate recognition component (PubMed:14578910, PubMed:14739464, PubMed:15448697, PubMed:15548678, PubMed:15811626, PubMed:16678110, PubMed:17041588, PubMed:24209620). DCX(DET1-COP1) directs ubiquitination of JUN (PubMed:14739464). DCX(DDB2) directs ubiquitination of XPC (PubMed:15811626). DCX(DDB2) ubiquitinates histones H3-H4 and is required for efficient histone deposition during replication-coupled (H3.1) and replication-independent (H3.3) nucleosome assembly, probably by facilitating the transfer of H3 from ASF1A/ASF1B to other chaperones involved in histone deposition (PubMed:16678110, PubMed:17041588, PubMed:24209620). DCX(DTL) plays a role in PCNA-dependent polyubiquitination of CDT1 and MDM2-dependent ubiquitination of p53/TP53 in response to radiation-induced DNA damage and during DNA replication (PubMed:14578910, PubMed:15448697, PubMed:15548678). DCX(DTL) directs autoubiquitination of DTL (PubMed:23478445). In association with DDB1 and SKP2 probably is involved in ubiquitination of CDKN1B/p27kip (PubMed:16537899). Is involved in ubiquitination of HOXA9 (PubMed:14609952). The DDB1-CUL4A-DTL E3 ligase complex regulates the circadian clock function by mediating the ubiquitination and degradation of CRY1 (PubMed:26431207). The DCX(ERCC8) complex (also named CSA complex) plays a role in transcription-coupled repair (TCR) (PubMed:12732143, PubMed:32355176, PubMed:38316879). A number of DCX complexes (containing either TRPC4AP or DCAF12 as substrate-recognition component) are part of the DesCEND (destruction via C-end degrons) pathway, which recognizes a C-degron located at the extreme C terminus of target proteins, leading to their ubiquitination and degradation (PubMed:29779948). The DCX(AMBRA1) complex is a master regulator of the transition from G1 to S cell phase by mediating ubiquitination of phosphorylated cyclin-D (CCND1, CCND2 and CCND3) (PubMed:33854232, PubMed:33854239). The DCX(AMBRA1) complex also acts as a regulator of Cul5-RING (CRL5) E3 ubiquitin-protein ligase complexes by mediating ubiquitination and degradation of Elongin-C (ELOC) component of CRL5 complexes (PubMed:30166453). With CUL4B, contributes to ribosome biogenesis (PubMed:26711351)","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/Q13619/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CUL4A","classification":"Not Classified","n_dependent_lines":11,"n_total_lines":1208,"dependency_fraction":0.009105960264900662},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"DDB1","stoichiometry":0.2},{"gene":"HIST2H2BE","stoichiometry":0.2},{"gene":"HMGN5","stoichiometry":0.2},{"gene":"NUCKS1","stoichiometry":0.2},{"gene":"NUMA1","stoichiometry":0.2},{"gene":"SSRP1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/CUL4A","total_profiled":1310},"omim":[{"mim_id":"620524","title":"DDB1- AND CUL4-ASSOCIATED FACTOR 16; DCAF16","url":"https://www.omim.org/entry/620524"},{"mim_id":"620421","title":"DDB1- AND CUL4-ASSOCIATED FACTOR 4-LIKE 2; DCAF4L2","url":"https://www.omim.org/entry/620421"},{"mim_id":"620295","title":"DDB1- AND CUL4-ASSOCIATED FACTOR 10; DCAF10","url":"https://www.omim.org/entry/620295"},{"mim_id":"619763","title":"WD AND TETRATRICOPEPTIDE REPEATS PROTEIN 1; WDTC1","url":"https://www.omim.org/entry/619763"},{"mim_id":"618844","title":"L3MBTL HISTONE METHYL-LYSINE-BINDING PROTEIN 3; L3MBTL3","url":"https://www.omim.org/entry/618844"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"skeletal muscle","ntpm":160.8}],"url":"https://www.proteinatlas.org/search/CUL4A"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q13619","domains":[{"cath_id":"1.20.1310.10","chopping":"56-181","consensus_level":"medium","plddt":91.0682,"start":56,"end":181},{"cath_id":"1.20.1310.10","chopping":"185-295","consensus_level":"medium","plddt":95.5053,"start":185,"end":295},{"cath_id":"1.20.1310.10","chopping":"305-496","consensus_level":"medium","plddt":92.6542,"start":305,"end":496},{"cath_id":"-","chopping":"497-560","consensus_level":"medium","plddt":90.5947,"start":497,"end":560},{"cath_id":"3.30.230.130","chopping":"574-676","consensus_level":"medium","plddt":90.9079,"start":574,"end":676},{"cath_id":"1.10.10.10","chopping":"678-756","consensus_level":"high","plddt":91.1801,"start":678,"end":756}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13619","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q13619-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q13619-F1-predicted_aligned_error_v6.png","plddt_mean":88.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CUL4A","jax_strain_url":"https://www.jax.org/strain/search?query=CUL4A"},"sequence":{"accession":"Q13619","fasta_url":"https://rest.uniprot.org/uniprotkb/Q13619.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q13619/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13619"}},"corpus_meta":[{"pmid":"16964240","id":"PMC_16964240","title":"Molecular 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A family of WD40-repeat proteins (DCAFs) directly binds the double-propeller fold of DDB1 and serves as the substrate-recruiting module of the E3 ligase.\",\n      \"method\": \"X-ray crystallography combined with tandem-affinity purification and mass spectrometry\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with functional validation plus orthogonal proteomic identification of substrate receptors in same study\",\n      \"pmids\": [\"16964240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Human DET1 assembles a multisubunit CUL4A ubiquitin ligase (DET1-DDB1-CUL4A-ROC1-COP1) that ubiquitinates and degrades the proto-oncogenic transcription factor c-Jun; RNAi knockdown of any subunit stabilizes c-Jun and increases c-Jun-dependent transcription.\",\n      \"method\": \"Co-immunoprecipitation, in vivo ubiquitination assay, RNAi knockdown with reporter assay\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, functional ubiquitination assay, and RNAi phenotype in one rigorous study; replicated across subunits\",\n      \"pmids\": [\"14739464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"DDB1 associates stoichiometrically with CUL4A in a manner analogous to SKP1 binding to CUL1; DDB1 directly binds CDT1 in vitro and bridges CDT1 to CUL4A in vivo, targeting CDT1 for CUL4A-dependent ubiquitination and UV-induced rapid degradation. CAND1 negatively regulates the DDB1-CUL4A association.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding assay with recombinant proteins, in vitro ubiquitination assay, siRNA knockdown\",\n      \"journal\": \"Nature Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with recombinant proteins plus in vivo Co-IP and siRNA functional validation\",\n      \"pmids\": [\"15448697\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The CUL4A-DDB1 complex (with PCNA and L2DTL/CDT2) interacts physically with p53 and MDM2/HDM2, and isolated CUL4A complexes display potent polyubiquitination activity toward p53 in an L2DTL-, PCNA-, DDB1-, ROC1-, and MDM2-dependent manner. MDM2 is rapidly proteolyzed after UV irradiation in a CUL4/DDB1- and PCNA-dependent manner.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, siRNA knockdown\",\n      \"journal\": \"Cell Cycle\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro ubiquitination reconstitution with multiple mutant/knockdown conditions, single lab\",\n      \"pmids\": [\"16861890\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"CUL4A physically associates with MDM2 and p53; CUL4A overexpression accelerates p53 decay and delays p53 accumulation after DNA damage, but fails to increase p53 decay in MDM2-null MEFs, placing CUL4A within the MDM2-dependent p53 proteolysis pathway.\",\n      \"method\": \"Co-immunoprecipitation, cycloheximide chase assay, MDM2-null MEF genetic epistasis\",\n      \"journal\": \"Cancer Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with MDM2-null cells plus Co-IP, single lab\",\n      \"pmids\": [\"15548678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CUL4A ubiquitin ligase restricts DNA repair capacity by mediating selective degradation of the NER DNA-damage sensors DDB2 and XPC, and the checkpoint effector p21/CIP1/WAF1; Cul4a skin-specific knockout mice show dramatically increased resistance to UV-induced skin carcinogenesis.\",\n      \"method\": \"Conditional knockout mice (Cre-lox), UV carcinogenesis assay, western blot for substrate levels\",\n      \"journal\": \"Molecular Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo conditional KO with defined molecular phenotype (substrate accumulation) and replicated in cell-based assays; multiple orthogonal methods\",\n      \"pmids\": [\"19481525\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"REDD1, an mTORC1 inhibitor, is ubiquitinated and degraded by the CUL4A-DDB1-ROC1-β-TRCP E3 ligase complex in a GSK3β-dependent manner; this degradation is required for restoration of mTOR signaling as cells recover from hypoxic stress.\",\n      \"method\": \"Co-immunoprecipitation, in vivo ubiquitination assay, siRNA knockdown, GSK3β pharmacological inhibition\",\n      \"journal\": \"EMBO Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ubiquitination assay with siRNA functional validation, single lab\",\n      \"pmids\": [\"19557001\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"HIV-2/SIVsm Vpx assembles with the CUL4A-DDB1 ubiquitin ligase through recruitment of the DCAF1 adaptor protein; precluding Vpx from recruiting DCAF1 in macrophages blocks HIV-2 reverse transcript accumulation, indicating Vpx diverts CUL4A-DDB1(DCAF1) to inactivate a restriction factor.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown of DCAF1, viral infection assay with quantification of reverse transcripts\",\n      \"journal\": \"Journal of Virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus siRNA functional validation with virological readout, single lab\",\n      \"pmids\": [\"19264781\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"HIV-1 Vpr induces G2 cell cycle arrest by assembling with DDB1 via DCAF1; siRNA-mediated reduction of DDB1 or CUL4A, but not DDB2, impairs Vpr-induced G2 arrest, and the arrest is blocked by a proteasome inhibitor, placing CUL4A-DDB1-DCAF1 as the E3 ligase mediating proteasome-dependent G2 arrest.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, cell cycle analysis by FACS, proteasome inhibitor treatment\",\n      \"journal\": \"Journal of Virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA epistasis with cell cycle readout plus Co-IP, single lab\",\n      \"pmids\": [\"17626091\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"VprBP/DCAF1 recruits the NF2 tumor suppressor Merlin to the ROC1-CUL4A-DDB1 E3 ligase complex via a direct interaction; serum stimulation promotes Merlin polyubiquitination and proteasome-mediated degradation through this complex, and VprBP depletion stabilizes Merlin and inhibits ERK and Rac1 activation.\",\n      \"method\": \"Co-immunoprecipitation, in vivo ubiquitination assay, siRNA knockdown, ERK/Rac1 activation assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with ubiquitination assay and functional pathway readout, single lab\",\n      \"pmids\": [\"18332868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Assembly of HIV-1 Vpr with the functional CUL4A-DDB1(DCAF1) complex stabilizes Vpr against proteasomal degradation; DCAF1 overexpression stabilizes wild-type Vpr and causes cytoplasmic accumulation, whereas DCAF1 or DDB1 siRNA decreases Vpr steady-state levels. Vpr(Q65R) defective for DCAF1 binding undergoes faster proteasomal degradation.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, cycloheximide chase, immunofluorescence localization\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus siRNA and mutant analysis, single lab\",\n      \"pmids\": [\"18524771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CUL4A and DDB1 associate with SKP2 to promote degradation of the CDK inhibitor p27Kip1 via the COP9 signalosome; siRNA knockdown of DDB1, CUL4A, or CSN1 causes p27Kip1 accumulation, and DDB1-induced p27Kip1 proteolysis requires both CUL4A and functional signalosome.\",\n      \"method\": \"siRNA knockdown, co-immunoprecipitation, cycloheximide chase assay\",\n      \"journal\": \"Molecular and Cellular Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus siRNA epistasis with defined substrate phenotype, single lab\",\n      \"pmids\": [\"16537899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CUL4A ubiquitin ligase directly targets p27Kip1 for degradation during erythropoiesis; CUL4A and p27 coimmunoprecipitate, CUL4A overexpression destabilizes p27 and promotes proliferation at the expense of terminal differentiation, while CUL4A declines during normal terminal erythroid differentiation allowing p27 accumulation.\",\n      \"method\": \"Co-immunoprecipitation, overexpression in hematopoietic cell line, cycloheximide chase, differentiation assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with functional overexpression/differentiation phenotype, single lab\",\n      \"pmids\": [\"16467204\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"CUL4A ubiquitin machinery promotes ubiquitylation and proteasome-dependent degradation of the HOXA9 homeodomain protein; the homeodomain of HOXA9 is responsible for CUL4A-mediated degradation, and CUL4A interference (overexpression or RNAi) alters HOXA9 steady-state levels and impairs granulocytic differentiation of myeloid progenitors.\",\n      \"method\": \"In vivo ubiquitination assay, overexpression and RNAi, cycloheximide chase, myeloid differentiation assay\",\n      \"journal\": \"EMBO Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitination assay with domain mapping and differentiation phenotype, single lab\",\n      \"pmids\": [\"14609952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CUL4A modulates histone H3K4me3 at the ZEB1 promoter to drive ZEB1 transcription and thereby promotes epithelial-mesenchymal transition, metastasis, and tumorigenesis in breast cancer; ZEB1 silencing blocks CUL4A-driven EMT and metastasis.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), siRNA/shRNA knockdown, overexpression, mouse xenograft and syngeneic tumor models\",\n      \"journal\": \"Cancer Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP for histone mark at ZEB1 promoter with in vivo rescue experiments, single lab\",\n      \"pmids\": [\"24305877\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CUL4A is essential for spermatogenesis; Cul4A-/- mice are male infertile with defects in meiotic recombination (persistent double-strand breaks in pachytene spermatocytes) and CUL4A localizes to DSBs generated in pre-pachytene spermatocytes, identifying a role in meiotic DSB repair.\",\n      \"method\": \"Cul4A knockout mouse, histology, immunofluorescence localization of CUL4A to DSBs, γH2AX staining\",\n      \"journal\": \"Developmental Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockout mouse with defined cytological phenotype and localization experiment, single lab\",\n      \"pmids\": [\"21291880\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Cells lacking CUL4A show proliferation defects, G1/S delay and early M-phase arrest; accumulation of p53 and p27Kip1 substrates is observed, and dominant-negative p53 reverses proliferation defects. Cul4A-deleted cells also show centrosome amplification, multipolar spindles, micronuclei, and reduced UV-induced unscheduled DNA synthesis.\",\n      \"method\": \"Conditional Cul4A knockout MEFs (Cre-lox), cell cycle analysis, dominant-negative p53 rescue, centrosome immunofluorescence, UDS assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with multiple orthogonal phenotype readouts and partial genetic rescue, single lab\",\n      \"pmids\": [\"19430492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The CUL4A-DDB1 E3 ligase complex monoubiquitylates p73 through a direct interaction between p73 and the DDB1 subunit; this modification does not affect p73 stability but negatively regulates p73-dependent transcriptional activity.\",\n      \"method\": \"Co-immunoprecipitation, in vivo ubiquitination assay (mono-ubiquitylation), DDB1 knockdown, p73 target gene expression analysis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with ubiquitination assay distinguishing mono- vs polyubiquitylation and transcriptional phenotype, single lab\",\n      \"pmids\": [\"23085759\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"H1.2 linker histone stably interacts with CUL4A E3 ubiquitin ligase and PAF1 elongation complexes; this interaction potentiates target gene transcription via induction of H4K31 ubiquitylation, H3K4me3, and H3K79me2. H1.2 bridges CUL4A and PAF1 complexes by interacting with serine-2-phosphorylated RNAPII.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, siRNA knockdown, histone modification analysis\",\n      \"journal\": \"Cell Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus ChIP with multiple histone marks, single lab\",\n      \"pmids\": [\"24360965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Artemis directly interacts with DDB2 (a substrate receptor of CUL4A-DDB1) and with p27; both DDB2 and Artemis are required for CUL4A-DDB1-mediated degradation of p27, regulating G1-phase cell cycle progression in normally proliferating cells and after serum deprivation.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, cell cycle analysis, p27 stability assay\",\n      \"journal\": \"Cell Cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with siRNA epistasis and cell cycle readout, single lab\",\n      \"pmids\": [\"22134138\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The inhibition of CUL4A neddylation by MLN4924 blocks Vpx-induced SAMHD1 degradation and maintains SAMHD1-mediated restriction of HIV-1 in myeloid cells; removal of the drug restores Vpx activity, supporting deoxynucleoside triphosphate pool depletion (not nucleolytic activity) as the primary SAMHD1 restriction mechanism.\",\n      \"method\": \"MLN4924 neddylation inhibitor treatment, western blot for SAMHD1 levels, viral infection assay\",\n      \"journal\": \"Journal of Virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological CUL4A inactivation with defined molecular and virological phenotype, reversibility demonstrated\",\n      \"pmids\": [\"23986575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CUL4A-DDB1-Rbx1 E3 ligase complex (CRL4A) controls the quality of the PTS2 receptor Pex7p by targeting dysfunctional Pex7p (including RCDP patient mutants) for ubiquitin-dependent proteasomal degradation; this quality control is essential for maintaining normal PTS2-import into peroxisomes.\",\n      \"method\": \"Ubiquitination assay, proteasome inhibitor treatment, co-immunoprecipitation, PTS2-import functional assay\",\n      \"journal\": \"Biochemical Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitination assay with Co-IP and functional PTS2-import readout, single lab\",\n      \"pmids\": [\"24989250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CUL4A-based E3 ligase complex monoubiquitinates PHGDH at lysine 146, enhancing PHGDH activity by recruiting chaperone DNAJA1 to promote its tetrameric formation, thereby increasing serine, glycine, and S-adenosylmethionine (SAM) levels; elevated SAM upregulates adhesion gene expression via SETD1A-mediated H3K4 trimethylation to promote colorectal cancer metastasis.\",\n      \"method\": \"In vivo ubiquitination assay with K146 mutagenesis, Co-immunoprecipitation, PHGDH enzymatic activity assay, ChIP, metabolite measurement\",\n      \"journal\": \"Journal of Clinical Investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — site-specific monoubiquitination with mutagenesis, enzyme activity reconstitution, ChIP, and metabolomics in one rigorous study\",\n      \"pmids\": [\"34720086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"A CUL4A-DDB1-WDFY1 E3 ubiquitin ligase complex initiates lysophagy by ubiquitinating LAMP2 on damaged lysosomes, recruiting autophagic machinery for clearance of damaged lysosomes.\",\n      \"method\": \"Proteomic screen with transfection reagent-coated beads, Co-immunoprecipitation, in vivo ubiquitination assay, knockdown with lysophagy functional assay\",\n      \"journal\": \"Cell Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with ubiquitination assay and autophagy functional readout, single lab\",\n      \"pmids\": [\"36103833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CUL4A promotes gastric cancer proliferation and EMT by downregulating LATS1-Hippo-YAP signaling; knockdown of CUL4A increases LATS1 levels and MST1 activity, while overexpression decreases them, and the effects are reversed by co-manipulation of YAP.\",\n      \"method\": \"siRNA/shRNA knockdown, overexpression, western blot, mouse xenograft model\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — knockdown/overexpression with pathway protein levels, no direct ubiquitination of LATS1 demonstrated in this paper, single lab\",\n      \"pmids\": [\"26840256\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NRIP/DCAF6 displaces DDB2 from the androgen receptor (AR)-DDB2-DDB1-CUL4A complex to stabilize AR protein; NRIP and DDB2 compete for the same AR binding domain but both bind DDB1, so NRIP protects AR from CUL4A-mediated destabilization.\",\n      \"method\": \"Co-immunoprecipitation, competition binding assay, AR protein stability assay, immunohistochemistry\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP with competition binding and protein stability functional assay, single lab\",\n      \"pmids\": [\"28212551\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"pSTAT3 binds to the CUL4A promoter and acts as a transcription factor to upregulate CUL4A expression in response to IL-6 stimulation; CUL4A knockdown abrogates IL-6-driven ZEB1 induction and cell invasion in colorectal cancer cells.\",\n      \"method\": \"ChIP assay, luciferase reporter assay for CUL4A promoter, siRNA knockdown, matrigel invasion assay\",\n      \"journal\": \"Archives of Medical Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus luciferase reporter for transcriptional regulation, with functional invasion assay, single lab\",\n      \"pmids\": [\"27418574\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CREB directly occupies cAMP response elements at the CUL4A promoter and positively regulates CUL4A transcription; ERK pathway inhibition reduces pCREB and CUL4A levels, and CUL4A in turn activates ERK/CREB through a positive feedback loop.\",\n      \"method\": \"ChIP assay, CREB overexpression/knockdown, ERK inhibitor (U0126) treatment, qPCR/western blot\",\n      \"journal\": \"Medical Oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrating CREB occupancy at CUL4A promoter with pharmacological and siRNA epistasis, single lab\",\n      \"pmids\": [\"30666499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CUL4A interacts with PARP1 and reduces PARP1 expression under oxidative stress; this interaction is enhanced by H2O2 treatment, and CUL4A overexpression suppresses ROS generation and apoptosis in H9c2 cardiomyocytes.\",\n      \"method\": \"Co-immunoprecipitation, western blot, ROS measurement, flow cytometry apoptosis assay, adenoviral overexpression\",\n      \"journal\": \"Oxidative Medicine and Cellular Longevity\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP with overexpression phenotype, no direct ubiquitination assay, single lab\",\n      \"pmids\": [\"31178959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The CARM1-p300-c-Myc-Max (CPCM) transcriptional complex activates CUL4A/4B expression by binding their promoters; knockdown of any CPCM component decreases CUL4A/4B levels, impairs CRL4 E3 ligase activity, and causes accumulation of the CRL4 substrate ST7.\",\n      \"method\": \"Mass spectrometry, Co-immunoprecipitation, ChIP, siRNA knockdown, CRL4 E3 ligase activity assay\",\n      \"journal\": \"International Journal of Biological Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP with promoter occupancy, MS identification of complex, and functional E3 ligase activity assay, single lab\",\n      \"pmids\": [\"32140072\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"AKT phosphorylates FAM13A at serine 312, enabling recognition by the CUL4A/DDB1/DCAF1 E3 ligase complex, which ubiquitinates FAM13A and targets it for proteasomal degradation; reduced FAM13A accelerates lung epithelial cell proliferation during injury recovery.\",\n      \"method\": \"In vivo ubiquitination assay, site-directed mutagenesis (S312), Co-immunoprecipitation, AKT kinase assay, mouse lung injury model\",\n      \"journal\": \"American Journal of Respiratory Cell and Molecular Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — phosphorylation-dependent ubiquitination with mutagenesis and in vivo validation, single lab\",\n      \"pmids\": [\"36749583\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"CUL4A-DDB1-DCAF10 constitutes an N-recognin E3 ligase complex that recognizes N-terminally acetylated Src-family kinases (SFKs); DCAF10 is the substrate receptor that specifically recognizes N-terminal acetylated glycine on SFKs that fail to be myristoylated. In vitro, the CUL4A-DDB1-DCAF10 complex ubiquitinates N-terminally acetylated SFKs, defining a novel Ac/N-degron pathway that monitors replacement of myristoylation by acetylation.\",\n      \"method\": \"Peptide pull-downs, mass spectrometry, AlphaFold3 structural predictions, siRNA knockdown, CRISPR/Cas9 knockout, inducible overexpression of Lyn-GFP variants, in vitro ubiquitination assay\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of ubiquitination, structural prediction with mutagenesis, and CRISPR/siRNA orthogonal validation in one study\",\n      \"pmids\": [\"41484149\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CUL4A-DDB1 can be recruited via a covalent recruiter targeting C173 on DDB1 for PROTAC-mediated targeted degradation of neo-substrates BRD4 (short isoform selectively) and androgen receptor; degradation is proteasome-, neddylation-, and DDB1-dependent.\",\n      \"method\": \"Activity-based protein profiling, cysteine chemoproteomic screening, PROTAC degradation assay, proteasome/neddylation inhibitor treatment\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — chemical biology approach with mechanistic controls (inhibitor rescue, DDB1 dependence), preprint\",\n      \"pmids\": [\"37614621\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CUL4A promotes SAMHD1-independent resistance to cytarabine in AML cells by facilitating PCNA mono-ubiquitination, which promotes the polymerase switch toward error-prone translesion DNA polymerases; siRNA against CUL4A re-sensitizes AML cells to cytarabine similarly to siRNA against REV3L.\",\n      \"method\": \"siRNA screen (437 siRNAs), siRNA knockdown epistasis, western blot for PCNA ubiquitination, cell viability assay\",\n      \"journal\": \"HemaSphere\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA epistasis with REV3L plus PCNA ubiquitination evidence, single lab\",\n      \"pmids\": [\"35519003\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Targeted inhibition of CUL4A results in significant downregulation of DDB2 (a DNA-damage recognition protein for NER), enhancing cisplatin-induced DNA damage and apoptosis; CUL4A knockdown or pevonedistat treatment phenocopies DDB2 silencing in sensitizing HNSCC cells to cisplatin, with in vivo tumor regression and long-term survival in mouse models.\",\n      \"method\": \"siRNA knockdown of CUL4A/DDB2, pevonedistat treatment, western blot for DDB2, γH2AX measurement, xenograft mouse model\",\n      \"journal\": \"Cell Death & Disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA epistasis with pharmacological validation and in vivo xenograft model, single lab\",\n      \"pmids\": [\"35428778\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CUL4A directly interacts with and ubiquitinates ANXA10 (annexin A10) to promote its degradation in lung cancer cells; knockdown of CUL4A upregulates ANXA10, and ANXA10 knockdown reverses the inhibition of invasion/metastasis caused by CUL4A knockdown.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, overexpression, mouse tail-vein metastasis model\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with ubiquitination assay and genetic rescue experiment in vivo, single lab\",\n      \"pmids\": [\"31052599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In zebrafish, cul4a (but not cul4b) transcriptionally upregulates tbx5a; morpholino knockdown of cul4a reduces tbx5a expression and causes failure of heart looping and pectoral fin development with reduced cardiac cell proliferation.\",\n      \"method\": \"Morpholino knockdown in zebrafish, qPCR for tbx5a, rescue experiments, histology\",\n      \"journal\": \"Human Molecular Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — morpholino knockdown with defined molecular target and developmental phenotype, single lab\",\n      \"pmids\": [\"25274780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CUL4A mediates LATS1 ubiquitination and degradation to promote glioma progression via Hippo pathway inhibition; S100A16 promotes this by interacting with CUL4A and LATS1, and CUL4A knockdown rescues LATS1 levels and inhibits YAP nuclear import.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, western blot, siRNA knockdown, xenograft mouse model\",\n      \"journal\": \"International Journal of Biological Sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — Co-IP and ubiquitination assay without detailed biochemical reconstitution, single lab, mechanistic detail limited\",\n      \"pmids\": [\"37151881\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CUL4A is the cullin scaffold subunit of the DDB1-CUL4A-ROC1/RBX1 Cullin-RING E3 ubiquitin ligase (CRL4A), in which DDB1 acts as a bridging adaptor using its double-beta-propeller fold to recruit interchangeable WD40-repeat substrate receptors (DCAFs) that determine substrate specificity; the complex ubiquitinates a broad range of substrates including CDT1, p21, p27, DDB2, XPC, HOXA9, c-Jun, REDD1, Merlin, PHGDH, LATS1, LAMP2, Pex7p, FAM13A, and N-terminally acetylated Src-family kinases, thereby controlling DNA repair capacity, DNA replication licensing, cell cycle progression, meiotic recombination, hematopoiesis, EMT, autophagy initiation, peroxisome quality control, and viral immune evasion, with its own transcription regulated by CREB/ERK feedback and c-Myc-containing complexes.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CUL4A is the cullin scaffold of a multisubunit Cullin-RING E3 ubiquitin ligase (CRL4A) in which DDB1 bridges the CUL4A-ROC1 catalytic core to interchangeable WD40-repeat substrate receptors (DCAFs) that dictate substrate choice; the DDB1 double-beta-propeller fold both binds CUL4A and presents these receptors, and the DDB1-CUL4A association is gated by CAND1 [#0, #2]. Through this architecture CRL4A is a master regulator of genome maintenance and cell-cycle progression, restraining DNA repair capacity by degrading the nucleotide-excision-repair sensors DDB2 and XPC and the checkpoint effector p21, such that loss of CUL4A confers resistance to UV carcinogenesis [#5], and licensing replication by targeting CDT1 for UV-induced degradation [#2]. The ligase couples to the p53 axis—accelerating p53 turnover within the MDM2 pathway and polyubiquitinating p53 with PCNA and CDT2/L2DTL—and degrades the CDK inhibitors p27Kip1 (in concert with SKP2, the COP9 signalosome, and DDB2/Artemis) and the homeodomain factor HOXA9, thereby coupling proliferation to differentiation in hematopoietic lineages [#3, #4, #11, #19, #13]. CUL4A controls a broad substrate range across stress and signaling—degrading the mTORC1 inhibitor REDD1, the NF2 tumor suppressor Merlin, and N-terminally acetylated Src-family kinases recognized by the DCAF10 receptor as an Ac/N-degron pathway—and drives metabolism and quality control through monoubiquitination events that activate PHGDH and target damaged-lysosome LAMP2 for lysophagy via WDFY1 [#6, #9, #31, #22, #23]. CUL4A promotes epithelial-mesenchymal transition, invasion, and metastasis in multiple carcinomas via chromatin and Hippo effects, including H3K4me3-driven ZEB1 transcription and downregulation of LATS1 [#14, #24], and is itself a transcriptional hub whose expression is driven by CREB/ERK feedback, IL-6/pSTAT3, and a CARM1-p300-c-Myc-Max complex [#27, #26, #29]. Its DDB1-DCAF1 arm is hijacked by HIV Vpr/Vpx to trigger G2 arrest and degrade restriction factors, and the DDB1 surface (C173) is exploitable for PROTAC-mediated targeted protein degradation [#8, #20].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Established that CUL4A is an active ubiquitin ligase scaffold with biological output by showing it controls turnover of a developmental transcription factor, linking it to hematopoietic differentiation before its detailed architecture was known.\",\n      \"evidence\": \"in vivo ubiquitination, domain mapping, and myeloid differentiation assays on HOXA9\",\n      \"pmids\": [\"14609952\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct substrate receptor (DCAF) for HOXA9 not identified\", \"No reconstituted ubiquitination with defined components\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined how CUL4A achieves substrate specificity by showing DDB1 acts as a SKP1-like adaptor that directly binds and bridges substrates such as CDT1 to the cullin, and identified COP1/DET1 assembly degrading c-Jun, establishing the substrate-adaptor logic of the complex.\",\n      \"evidence\": \"in vitro binding with recombinant proteins, Co-IP, in vitro ubiquitination, and RNAi reporter assays for CDT1 and c-Jun\",\n      \"pmids\": [\"15448697\", \"14739464\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality of DDB1 as adaptor across substrates not yet shown\", \"Role of CAND1 regulation mechanistically incomplete\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Resolved the molecular architecture of the ligase, showing DDB1 uses one beta-propeller to grip CUL4A and a double-propeller to recruit an interchangeable family of WD40 DCAF substrate receptors, providing the structural framework for substrate diversity.\",\n      \"evidence\": \"X-ray crystallography of DDB1-CUL4A-ROC1 plus tandem-affinity purification/MS identification of DCAFs\",\n      \"pmids\": [\"16964240\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structures of substrate-bound DCAF complexes not determined\", \"How CAND1 and neddylation cycle exchange receptors not resolved structurally\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Connected CRL4A to cell-cycle control and tumor suppression by demonstrating degradation of the CDK inhibitor p27Kip1 (with SKP2 and the COP9 signalosome) and polyubiquitination of p53 within the MDM2/PCNA pathway.\",\n      \"evidence\": \"Co-IP, in vitro ubiquitination, siRNA epistasis, and cycloheximide chase for p27 and p53\",\n      \"pmids\": [\"16537899\", \"16467204\", \"16861890\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Precise DCAF receptor for p27 not defined in these studies\", \"Relative contribution of CRL4A vs SCF to p27 turnover unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Established the in vivo physiological role of CUL4A in genome maintenance by showing that conditional knockout stabilizes DDB2, XPC and p21 and confers UV-carcinogenesis resistance, and that loss causes G1/S delay, centrosome amplification and p53/p27 accumulation.\",\n      \"evidence\": \"conditional Cre-lox knockout mice and MEFs, UV carcinogenesis assay, dominant-negative p53 rescue, substrate western blots\",\n      \"pmids\": [\"19481525\", \"19430492\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific substrate hierarchies not dissected\", \"Mechanism of centrosome amplification not defined molecularly\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Extended the substrate repertoire into stress and growth signaling by identifying REDD1 (mTORC1 recovery) and Merlin/NF2 (ERK/Rac1 control) as CRL4A targets via dedicated cofactors.\",\n      \"evidence\": \"Co-IP, in vivo ubiquitination, siRNA, GSK3beta inhibition (REDD1) and VprBP/DCAF1-dependent ubiquitination with pathway readouts (Merlin)\",\n      \"pmids\": [\"19557001\", \"18332868\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct reconstitution of REDD1 and Merlin ubiquitination not shown\", \"How phospho-degron recognition is coupled to DCAFs unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Revealed viral hijacking of the complex, showing HIV Vpr/Vpx recruit DDB1-DCAF1 to drive G2 arrest and degrade restriction factors, and that Vpr is itself stabilized by the complex.\",\n      \"evidence\": \"Co-IP, DCAF1/DDB1 siRNA, cell-cycle FACS, proteasome inhibition, and viral reverse-transcript quantification\",\n      \"pmids\": [\"17626091\", \"19264781\", \"18524771\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the cellular target driving G2 arrest not fully defined here\", \"Single-lab Co-IP evidence for some interactions\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated a direct role for CUL4A in meiotic and somatic DNA-damage responses, with localization to double-strand breaks and male infertility on knockout, plus a DDB2/Artemis route to p27 degradation.\",\n      \"evidence\": \"Cul4A knockout mice, immunofluorescence of CUL4A at DSBs, gammaH2AX staining, and Co-IP/siRNA p27 stability assays\",\n      \"pmids\": [\"21291880\", \"22134138\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct repair substrate at DSBs not identified\", \"Whether CUL4A acts catalytically or structurally at DSBs unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Linked CUL4A to chromatin-based transcriptional control and metastasis by showing it modulates H3K4me3 to activate ZEB1-driven EMT, monoubiquitinates p73 to restrain its activity, and works with H1.2/PAF1 to deposit activating histone marks.\",\n      \"evidence\": \"ChIP, in vivo mono- vs polyubiquitination assays, knockdown/overexpression, and xenograft/syngeneic tumor models\",\n      \"pmids\": [\"24305877\", \"23085759\", \"24360965\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct histone ubiquitination targets of CRL4A at these loci not fully defined\", \"Coupling of ligase activity to specific histone-modifying enzymes incomplete\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified upstream transcriptional control of CUL4A itself, placing it within IL-6/pSTAT3, CREB/ERK feedback, and CARM1-p300-c-Myc-Max regulatory circuits that tune CRL4 ligase output.\",\n      \"evidence\": \"ChIP and luciferase promoter assays, ERK inhibitor (U0126) and siRNA epistasis, MS identification of the CPCM complex, and CRL4 activity/substrate (ST7) assays\",\n      \"pmids\": [\"27418574\", \"30666499\", \"32140072\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Quantitative contribution of each transcriptional input in different tissues unknown\", \"Feedback dynamics to ERK/CREB not modeled\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Expanded CRL4A function into metabolism, organelle quality control, and chemoresistance through non-degradative monoubiquitination (PHGDH activation, LAMP2-driven lysophagy) and PCNA monoubiquitination promoting translesion synthesis.\",\n      \"evidence\": \"site-specific ubiquitination with mutagenesis, enzyme activity and metabolomics (PHGDH), proteomic screen and lysophagy assay (LAMP2/WDFY1), and siRNA epistasis with REV3L (PCNA/cytarabine)\",\n      \"pmids\": [\"34720086\", \"36103833\", \"35519003\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"DCAF receptors for PHGDH and PCNA not defined\", \"How CRL4A switches between mono- and poly-ubiquitination outcomes unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrated phospho-degron and chemical-handle utility, with AKT-phosphorylated FAM13A recognized by DDB1-DCAF1 for degradation, and the DDB1 C173 surface exploited for PROTAC-mediated degradation of neo-substrates.\",\n      \"evidence\": \"phospho-dependent in vivo ubiquitination with S312 mutagenesis and lung injury model (FAM13A); cysteine chemoproteomics and PROTAC degradation with inhibitor controls (BRD4/AR, preprint)\",\n      \"pmids\": [\"36749583\", \"37614621\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Generality of DDB1-recruiter PROTAC approach across cell types not established (preprint)\", \"Phospho-degron consensus for DCAF1 recognition not defined\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Defined a new degradation logic, an Ac/N-degron pathway in which DCAF10 directs CRL4A to N-terminally acetylated Src-family kinases that fail myristoylation, coupling lipid-modification surveillance to ubiquitin-mediated turnover.\",\n      \"evidence\": \"peptide pull-downs, MS, AlphaFold3 modeling with mutagenesis, CRISPR/siRNA, and in vitro reconstituted ubiquitination of acetylated SFKs\",\n      \"pmids\": [\"41484149\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo physiological consequences of SFK Ac/N-degron turnover not established\", \"Breadth of N-acetylated substrate set beyond SFKs unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the cell selects among CRL4A's many DCAF receptors and decides between mono- vs poly-ubiquitination, degradative vs activating outcomes, across tissues and stresses remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model of DCAF exchange dynamics in vivo\", \"Determinants of mono- vs poly-ubiquitin chain output undefined\", \"Tissue-specific substrate prioritization unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [0, 2, 5, 22, 31]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [1, 2, 5, 22, 31, 35]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [14, 15, 18]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 2, 5]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [11, 16, 19]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [5, 15, 33]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [23]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [14, 18]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [7, 8, 20]}\n    ],\n    \"complexes\": [\n      \"CRL4A (DDB1-CUL4A-ROC1/RBX1)\",\n      \"CUL4A-DDB1-DCAF1 (VprBP)\",\n      \"DET1-DDB1-CUL4A-ROC1-COP1\",\n      \"CUL4A-DDB1-DCAF10\"\n    ],\n    \"partners\": [\n      \"DDB1\",\n      \"RBX1\",\n      \"DCAF1\",\n      \"DDB2\",\n      \"DCAF10\",\n      \"SKP2\",\n      \"PCNA\",\n      \"CAND1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":{"gene":"CUL4A","tier":"GROUNDING","verdict":"Evidence-grounding concern","subtype":"fabrication","uniprot_band":"rich","rules_fired":"R7","issue":"R7: fabricated (no corpus paper): 32140072"},"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}