| 2009 |
CUL4B contains a unique N-terminal nuclear localization signal (NLS) at amino acids 37-40 (KKRK) that binds importin α1, α3, and α5; this NLS is required for nuclear entry and for CUL4B-mediated ubiquitination and degradation of cyclin E, enabling cell cycle progression. NLS-deleted CUL4B localizes to the cytoplasm and fails to promote cell proliferation. |
RNAi knockdown, NLS deletion mutagenesis, importin binding assays, cyclin E ubiquitination assays, cell proliferation assays |
The Journal of biological chemistry |
High |
19801544
|
| 2007 |
CUL4B encodes the scaffold protein of a cullin-RING ubiquitin E3 ligase (CRL4B) complex; truncating and missense mutations abolish its C-terminal catalytic domain and cause nonsense-mediated mRNA decay, establishing CUL4B as a ubiquitin E3 ligase subunit required for cognition and development. |
Genetic mutation identification, functional domain analysis, NMD demonstration in patient leukocytes |
American journal of human genetics |
High |
17236139 17273978
|
| 2012 |
In Cul4b-null mouse embryos, cyclin E (a CRL4B substrate) accumulates, confirming that CUL4B is required for cyclin E ubiquitination in vivo; Cul4b null embryos die by E9.5 with severe developmental arrest. |
Cul4b knockout mouse generation (exons 3-5 deletion), Western blot for cyclin E accumulation in null embryos |
PloS one |
High |
22606329
|
| 2012 |
CUL4B loss in extra-embryonic tissues leads to robust accumulation of p21(Cip1/WAF) and G2/M cell cycle arrest; p21 silencing partially rescues this arrest, placing p21 as a direct CUL4B substrate in extra-embryonic cells. |
Epiblast-specific Cul4b conditional knockout, extra-embryonic cell line CUL4B silencing, p21 double knockdown rescue epistasis |
Cell research |
High |
22453236
|
| 2013 |
CUL4B promotes replication licensing by positively regulating CDC6 via CDK2: CUL4B represses miR-372 and miR-373 to upregulate CDK2, which phosphorylates CDC6, protecting it from APC(CDH1)-mediated degradation and allowing MCM2 loading onto chromatin. |
CUL4B knockdown, miRNA manipulation, CDK2/CDC6 epistasis, chromatin fractionation for MCM2, CDC6 phosphorylation assays |
The Journal of cell biology |
High |
23479742
|
| 2013 |
CUL4B ubiquitin ligase complex (requiring DDB1-CUL4B-ROC1 integrity) targets Jab1/CSN5 for polyubiquitination and proteasomal degradation; loss of CUL4B leads to Jab1 accumulation and abnormal upregulation of BMP signaling in vitro and in Cul4b-deficient mouse embryonic fibroblasts. |
RNAi depletion, co-immunoprecipitation, in vitro and in vivo ubiquitination assays, MEF analysis from Cul4b-null mice |
Biochimica et biophysica acta |
High |
23357576
|
| 2013 |
XLID-associated CUL4B mutants (R388X, R572C, V745A) are defective in promoting ubiquitination and degradation of TSC2 and cyclin E in neurons; by promoting TSC2 degradation, wild-type CUL4B positively regulates mTOR activity (phospho-mTOR, phospho-p70S6K, phospho-4E-BP1) in neocortical neurons. |
Adenovirus-mediated expression of WT and mutant CUL4B in neocortical neurons, shRNA knockdown, Western blot for TSC2/cyclin E/mTOR pathway components |
Biochimica et biophysica acta |
High |
23348097
|
| 2014 |
CUL4B negatively regulates the p53-ROS positive feedback loop driving cellular senescence: CUL4B promotes p53 ubiquitination and proteasomal degradation in human fibroblasts under oxidative stress, and its loss amplifies p53-dependent ROS production and senescence. |
CUL4B depletion and ectopic expression in NHFs, p53 ubiquitination assay, ROS measurement, senescence assay |
Free radical biology & medicine |
High |
25464270
|
| 2015 |
CUL4B activates Wnt/β-catenin signaling in hepatocellular carcinoma by epigenetically silencing Wnt antagonists (DKK1, PPP2R2B): CRL4B promotes PRC2 recruitment and H3K27me3 at antagonist promoters; knockdown of PPP2R2B partially reverses CUL4B-depletion-induced β-catenin downregulation. |
CUL4B knockdown/overexpression, ChIP for PRC2 and H3K27me3, PPP2R2B double knockdown rescue epistasis, in vitro and xenograft assays |
The Journal of pathology |
High |
25430888
|
| 2015 |
CUL4B is activated by DNA damage in a NEDD8-dependent manner and ubiquitinates HUWE1 in vitro and in vivo, targeting it for proteasomal degradation; CUL4B depletion stabilizes HUWE1, accelerating MCL-1 degradation and increasing apoptosis sensitivity to DNA damage reagents, an effect rescued by simultaneous HUWE1 depletion. |
In vitro ubiquitination assay, CUL4B knockdown, HUWE1/CUL4B double depletion epistasis, DNA damage reagent sensitivity assays |
Nucleic acids research |
High |
25883150
|
| 2015 |
CUL4B represses GFAP expression in neural progenitor cells by targeting and epigenetically repressing Ptgds (encoding PTGDS) via the CUL4B/PRC2 complex; PTGDS inhibition or knockdown attenuates increased GFAP+ cell generation caused by Cul4b loss. |
Nervous-system-specific Cul4b KO mouse, NPC cultures, shRNA knockdown of Ptgds, pharmacological PTGDS inhibition rescue |
Human molecular genetics |
High |
26025376
|
| 2016 |
CRL4B negatively regulates PPARγ stability by promoting its polyubiquitination and proteasomal degradation; adipocyte-specific Cul4b KO mice show upregulated PPARγ-target genes, increased adipogenesis, improved insulin sensitivity, and decreased adipose inflammation. |
In vitro PPARγ ubiquitination assay, adipocyte-specific Cul4b conditional KO mice, high-fat diet metabolic phenotyping |
Diabetes |
High |
27899484
|
| 2016 |
Germ cell-specific deletion of Cul4b causes male infertility due to impaired sperm motility associated with reduced mitochondrial activity, glycolysis, and ATP production, defective axonemal microtubule and flagella outer dense fiber arrangement. INSL6 was identified as a novel CUL4B substrate in male germ cells by direct polyubiquitination and degradation assays. |
Cul4b conditional KO (Vasa-Cre), mass spectrometry substrate identification, in vitro polyubiquitination of INSL6, sperm motility/ATP assays |
The Journal of biological chemistry |
High |
26846852
|
| 2019 |
CUL4B promotes macrophage migration and adhesion by epigenetically repressing miR-194-5p, leading to elevated integrin α9 (ITGA9); high glucose upregulates CUL4B in macrophages, and myeloid CUL4B deficiency suppresses macrophage renal infiltration and alleviates diabetic kidney injury. |
Myeloid-specific Cul4b KO mouse DKD models, ChIP for H2AK119ub at miR-194-5p locus, ITGA9 validation, macrophage migration/adhesion assays |
Cell reports |
High |
37224018
|
| 2019 |
CUL4B epigenetically represses Pten transcription in macrophages (maintaining AKT-GSK3β anti-inflammatory pathway); CUL4B deletion leads to PTEN upregulation, uncontrolled GSK3β activity and excessive TLR-triggered inflammatory cytokine production; GSK3β inhibition rescues the phenotype. |
Myeloid-specific Cul4b KO mice, LPS/polyI:C/Salmonella challenge, ChIP at Pten promoter, GSK3β inhibitor rescue, cytokine measurements |
Cellular & molecular immunology |
High |
31729464
|
| 2021 |
CUL4B interacts with HBx protein and inhibits its ubiquitin-dependent proteasomal degradation, stabilizing HBx and promoting HBV replication; CUL4B promotes HBV replication in an HBx-dependent manner confirmed in transgenic and conditional KO mouse hepatitis B models. |
Co-immunoprecipitation, immunofluorescence co-localization, cycloheximide chase assay, in vivo ubiquitination assay, Cul4b transgenic and conditional KO mice with hydrodynamics-based HBV model |
Cancer biology & medicine |
High |
33969670
|
| 2021 |
CRL4B interacts with multiple HDAC-containing corepressor complexes (MTA1/NuRD, SIN3A, CoREST, NcoR/SMRT) and co-occupies E-cadherin and AXIN2 promoters together with transcription factors Snail and ZEB2 to repress their transcription and promote breast cancer EMT. |
Co-immunoprecipitation, ChIP, functional assays (invasion, EMT), in vitro and in vivo tumor models |
Advanced science (Weinheim, Baden-Wurttemberg, Germany) |
High |
34026424
|
| 2021 |
CUL4B loss partially prevents TCDD-activated AHR proteasomal degradation; TiPARP knockdown in CUL4B-null cells completely abolishes AHR degradation, revealing that CUL4B (E3 ubiquitin ligase targeting AHR for ubiquitination) and TiPARP (ADP-ribosylation) cooperate to promote AHR nuclear export and degradation after TCDD activation. |
Cul4b-null MEF cell line, TiPARP siRNA knockdown, AHR protein stability assays, AHR transcriptional activity reporter |
The Journal of biological chemistry |
High |
34146543
|
| 2021 |
THAP7-AS1 lncRNA interacts with the 1-50 aa NLS region of CUL4B and promotes interaction between NLS and importin α1, enhancing CUL4B nuclear entry; nuclear CUL4B then represses miR-22-3p and miR-320a via H2AK119ub1 and EZH2-mediated H3K27me3, activating PI3K/AKT signaling. |
RNA pulldown, co-immunoprecipitation, domain mapping (NLS deletion), fractionation, ChIP, miRNA quantification |
Cell death and differentiation |
High |
34608273
|
| 2021 |
Cul4b abundance and neddylation increase after TCR stimulation; Cul4b-deficient CD4+ T cells show impaired proliferation, survival, and accumulated DNA damage; Cul4b preferentially associates with DCAF1 and interacts with DNA damage sensing/repair proteins; downstream SMC1A phosphorylation is absent in Cul4b-KO T cells despite DNA damage sensing. |
T cell conditional KO, proliferation and survival assays, mass spectrometry interactome, phospho-SMC1A immunoblot |
PLoS biology |
High |
33524014
|
| 2023 |
CUL4B N-terminal extension is heavily phosphorylated during mitosis; this phosphorylation promotes binding to two novel CUL4B-specific DCAFs (LIS1 and WDR1, which interact with DDB1) while triggering chromatin exclusion and binding to actin regulators; phosphorylation is required for mitotic spindle positioning and cortical tension control. The XLID-causing P50L mutation perturbs this phosphorylation pattern. |
Phosphoproteomics, co-immunoprecipitation of LIS1/WDR1 with DDB1, mutagenesis of phosphorylation sites, live-cell imaging, cortical tension measurements, human forebrain organoid model |
The EMBO journal |
High |
37365982
|
| 2023 |
CUL4B-DDB1-COP1 complex functions as the E3 ligase responsible for UTX (KDM6A) ubiquitination and proteasomal degradation in colorectal cancer cells; Cop1 deficiency in mouse intestinal tissue results in UTX accumulation. |
Co-immunoprecipitation, immunoblot, conditional Cop1 KO mouse, GSK126 (EZH2 inhibitor) rescue |
Experimental hematology & oncology |
High |
37679762
|
| 2023 |
CUL4B and DCAF7 promote MEN1 ubiquitination and proteasomal degradation in pancreatic neuroendocrine tumor cells; suppression of DCAF7 or neddylation (with MLN4924) induces MEN1 accumulation; simultaneous MEN1 knockdown counteracts DCAF7 loss effects. |
Co-immunoprecipitation, ubiquitination assays, MLN4924 neddylation inhibition, DCAF7/MEN1 double knockdown epistasis, in vivo xenograft |
Cancer research |
High |
36939378
|
| 2023 |
c-Myc increases CUL4B levels in activated CD8+ T cells; Cul4b-deficient CD8+ T cells accumulate DNA damage and undergo proliferative catastrophe with p21 and Cyclin E2 accumulation (replication stress), failing to clear LCMV in vivo; this places CUL4B downstream of c-Myc in maintaining genome stability during T cell expansion. |
T cell-specific Cul4b KO, in vivo LCMV challenge, DNA damage markers, p21/CyclinE2 Western blot, proliferation assays |
Nature communications |
High |
37925424
|
| 2023 |
CUL4B directly binds the Cxcl2 promoter and epigenetically represses its transcription; CUL4B deletion increases CXCL2, which binds CXCR2 on MDSCs promoting their tumor infiltration and lung ADC progression. |
CUL4B KO autochthonous and transplantable KRAS-mutant models, ChIP at Cxcl2 promoter, CXCL2/CXCR2 functional assays, MDSC targeting rescue |
Oncogene |
High |
37653114
|
| 2023 |
CUL4B promotes MEN1 osteogenic differentiation of mesenchymal stem cells by epigenetically repressing KLF4 (inhibiting adipogenesis) and C/EBPδ (promoting osteogenesis); CRL4B complex directly binds Klf4 and Cebpd promoters to repress their transcription. |
MSC-specific Cul4b conditional KO mice, ChIP at Klf4 and Cebpd promoters, osteogenesis/adipogenesis differentiation assays, aging and ovariectomy models |
Bone research |
High |
37268647
|
| 2024 |
CRL4B represses transcription of PPP2R2B and PPP2R2C (PP2A regulatory subunit isoforms) by catalyzing H2AK119 monoubiquitination at their promoters; CUL4B mutations cause upregulated PP2A activity, which inhibits AKT and ERK, leading to premature cell cycle exit and precocious neuronal differentiation in cortical organoids; AKT/ERK activation or PP2A inhibition rescues the neurogenesis defect. |
Patient iPSC-derived cerebral organoids and 2D neuronal cultures, ChIP for H2AK119ub at PP2A regulatory subunit promoters, PP2A activity assay, AKT/ERK phosphorylation, pharmacological rescue |
Cell death & disease |
High |
38331954
|
| 2024 |
CUL4B protects kidneys from acute injury by promoting polyubiquitination and degradation of p53, suppressing PAI-1 expression; prior to radiation, CUL4B inhibits ubiquitination of PSME3 (causing its accumulation and negative regulation of p53-mediated apoptosis), whereas after radiation, CUL4B dissociates from PSME3 and translocates to γH2AX foci, inhibiting BRCA1 phosphorylation and RAD51 to augment apoptosis. |
Kidney-specific Cul4b KO mice (cisplatin and IR models), transcriptome analysis, p53 ubiquitination assay, PSME3 co-IP and ubiquitination, p53/PAI-1 inhibitor rescue |
Cell death & disease |
High |
39695153
|
| 2015 |
CUL4B/AKT/β-catenin axis in hematopoietic cells restricts MDSC accumulation; hematopoietic-specific Cul4b ablation (Tek-Cre) causes aberrant MDSC expansion mediated by downregulation of AKT/β-catenin; CUL4B epigenetically represses PP2A and PHLPP1/2 phosphatases to sustain AKT activation. |
Hematopoietic-specific Cul4b conditional KO (Tek-Cre), MDSC quantification by flow cytometry, AKT/β-catenin pathway analysis, PP2A/PHLPP1/2 expression analysis |
Cancer research |
High |
26450912
|
| 2019 |
CUL4B-deficient MDSCs produce elevated IL-6, which activates IL-6/STAT3 signaling in tumor cells to confer stem cell-like properties; the CRL4B complex epigenetically represses IL-6 transcription in myeloid cells via histone modification. |
Hematopoietic and myeloid-specific Cul4b KO mice, IL-6 ELISA, STAT3 phosphorylation, IL-6 blocking and STAT3 inhibition rescue, tumor transplantation models |
Oncogene |
High |
31235785
|
| 2017 |
CRL4B complex epigenetically represses miR-194 by catalyzing H2AK119 monoubiquitination and coordinating with PRC2 for H3K27 trimethylation at the miR-194 gene cluster; miR-194 directly targets CUL4B 3'-UTR to downregulate it; p53 negatively regulates CUL4B via miR-194, forming a double-negative feedback loop. |
ChIP for H2AK119ub and H3K27me3, miR-194 overexpression/inhibition, 3'-UTR luciferase reporter, p53 epistasis |
Molecular oncology |
High |
28164432
|
| 2020 |
CRL4B epigenetically represses miR-372/373 transcription by catalyzing H2AK119 monoubiquitination at their gene cluster, leading to upregulation of PIK3CA and AKT activation in bladder cancer; this establishes the CUL4B-miR-372/373-PIK3CA/AKT axis in bladder cancer pathogenesis. |
ChIP for H2AK119ub at miR-372/373 locus, miR-372/373 overexpression/inhibition, PIK3CA/AKT pathway analysis, xenograft model |
Oncogene |
High |
32127645
|
| 2019 |
Small molecule TSC01682 specifically disrupts the CUL4B-DDB1 interaction (identified by HTS in yeast), decreasing assembly of CRL4B and reducing ubiquitination of substrates CDKN1A (p21) and PTEN in osteosarcoma cells, demonstrating that direct CUL4B-DDB1 binding is required for CRL4B complex assembly and substrate ubiquitination. |
In vitro yeast-based HTS, co-immunoprecipitation of CUL4B-DDB1 in yeast and human cells, p21/PTEN ubiquitination assay, in vivo tumor growth inhibition |
American journal of cancer research |
High |
31598391
|
| 2015 |
CUL4B variants in XLID patients interact with WDR62 (a microcephaly protein); this interaction was demonstrated by co-immunoprecipitation and may contribute to cerebral malformations. |
Co-immunoprecipitation of CUL4B with WDR62, genetic patient cohort analysis |
Human mutation |
Medium |
25385192
|
| 2012 |
Three major CUL4B isoforms exist in brain: Cul4B-1 and -2 are predominantly unneddylated (due to their N-terminus inhibiting neddylation), while the smaller Cul4B-3 lacking the N-terminus is neddylated; knockdown of Cul4b arrests neural progenitor cells in G2/M phase; unneddylated Cul4B promotes β-catenin accumulation during mitosis. |
Endogenous isoform characterization, neddylation immunoblot, shRNA-mediated knockdown, cell cycle analysis, immunostaining in brain tissues |
BMC neuroscience |
Medium |
22992378
|
| 2025 |
CUL4B promotes ubiquitination and degradation of ARID1A within the SWI/SNF complex in thyroid cancer; CUL4B-mediated ARID1A degradation decreases expression of the differentiation marker PAX8, driving dedifferentiation toward anaplastic thyroid carcinoma. |
CUL4B overexpression/knockdown in vivo models, RNA-seq, ubiquitination assays for ARID1A, co-immunoprecipitation, PAX8 immunohistochemistry |
Translational oncology |
Medium |
40203790
|
| 2023 |
CUL4B promotes G-CSF (Csf3) expression in colorectal cancer epithelial cells by epigenetically repressing Csf3 transcription in a PRC2-dependent manner; CUL4B deletion activates G-CSF, promoting MDSC recruitment to ApcMin/+ adenomas. |
ApcMin/+;Cul4bΔIEC mouse model, ChIP for PRC2 at Csf3 promoter, MDSC quantification, in vivo MDSC inhibition, organoid assays |
Neoplasia (New York, N.Y.) |
Medium |
38761506
|
| 2021 |
CUL4B coordinates with HDAC to co-occupy the CDKN1A (p21) promoter and epigenetically silence CDKN1A transcription in glioblastoma, leading to attenuation of TMZ-induced senescence and TMZ resistance; CUL4B knockdown restores TMZ sensitivity. |
ChIP for CUL4B and HDAC at CDKN1A promoter, senescence β-galactosidase staining, CUL4B knockdown TMZ sensitivity assays |
Frontiers in oncology |
Medium |
33869025
|
| 2020 |
CREB acts as a transcription factor for CUL4B by directly binding CREs in the CUL4B promoter; ChIP confirmed pCREB occupancy at CUL4B promoter, and CREB overexpression increases CUL4B expression along with H3K27me3 and H2AK119ub marks. |
Site-directed mutagenesis of CRE sites, promoter reporter assay, ChIP for pCREB at CUL4B promoter, CREB overexpression/knockdown |
Medical oncology (Northwood, London, England) |
Medium |
32710193
|